3012 lines
74 KiB
C
3012 lines
74 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* USB4 specific functionality
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*
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* Copyright (C) 2019, Intel Corporation
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* Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
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* Rajmohan Mani <rajmohan.mani@intel.com>
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*/
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#include <linux/delay.h>
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#include <linux/ktime.h>
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#include <linux/units.h>
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#include "sb_regs.h"
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#include "tb.h"
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#define USB4_DATA_RETRIES 3
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#define USB4_DATA_DWORDS 16
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#define USB4_NVM_READ_OFFSET_MASK GENMASK(23, 2)
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#define USB4_NVM_READ_OFFSET_SHIFT 2
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#define USB4_NVM_READ_LENGTH_MASK GENMASK(27, 24)
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#define USB4_NVM_READ_LENGTH_SHIFT 24
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#define USB4_NVM_SET_OFFSET_MASK USB4_NVM_READ_OFFSET_MASK
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#define USB4_NVM_SET_OFFSET_SHIFT USB4_NVM_READ_OFFSET_SHIFT
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#define USB4_DROM_ADDRESS_MASK GENMASK(14, 2)
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#define USB4_DROM_ADDRESS_SHIFT 2
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#define USB4_DROM_SIZE_MASK GENMASK(19, 15)
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#define USB4_DROM_SIZE_SHIFT 15
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#define USB4_NVM_SECTOR_SIZE_MASK GENMASK(23, 0)
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#define USB4_BA_LENGTH_MASK GENMASK(7, 0)
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#define USB4_BA_INDEX_MASK GENMASK(15, 0)
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enum usb4_ba_index {
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USB4_BA_MAX_USB3 = 0x1,
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USB4_BA_MIN_DP_AUX = 0x2,
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USB4_BA_MIN_DP_MAIN = 0x3,
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USB4_BA_MAX_PCIE = 0x4,
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USB4_BA_MAX_HI = 0x5,
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};
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#define USB4_BA_VALUE_MASK GENMASK(31, 16)
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#define USB4_BA_VALUE_SHIFT 16
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/* Delays in us used with usb4_port_wait_for_bit() */
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#define USB4_PORT_DELAY 50
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#define USB4_PORT_SB_DELAY 1000
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static int usb4_native_switch_op(struct tb_switch *sw, u16 opcode,
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u32 *metadata, u8 *status,
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const void *tx_data, size_t tx_dwords,
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void *rx_data, size_t rx_dwords)
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{
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u32 val;
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int ret;
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if (metadata) {
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ret = tb_sw_write(sw, metadata, TB_CFG_SWITCH, ROUTER_CS_25, 1);
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if (ret)
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return ret;
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}
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if (tx_dwords) {
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ret = tb_sw_write(sw, tx_data, TB_CFG_SWITCH, ROUTER_CS_9,
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tx_dwords);
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if (ret)
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return ret;
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}
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val = opcode | ROUTER_CS_26_OV;
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ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
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if (ret)
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return ret;
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ret = tb_switch_wait_for_bit(sw, ROUTER_CS_26, ROUTER_CS_26_OV, 0, 500);
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if (ret)
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return ret;
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ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
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if (ret)
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return ret;
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if (val & ROUTER_CS_26_ONS)
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return -EOPNOTSUPP;
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if (status)
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*status = (val & ROUTER_CS_26_STATUS_MASK) >>
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ROUTER_CS_26_STATUS_SHIFT;
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if (metadata) {
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ret = tb_sw_read(sw, metadata, TB_CFG_SWITCH, ROUTER_CS_25, 1);
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if (ret)
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return ret;
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}
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if (rx_dwords) {
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ret = tb_sw_read(sw, rx_data, TB_CFG_SWITCH, ROUTER_CS_9,
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rx_dwords);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int __usb4_switch_op(struct tb_switch *sw, u16 opcode, u32 *metadata,
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u8 *status, const void *tx_data, size_t tx_dwords,
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void *rx_data, size_t rx_dwords)
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{
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const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
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if (tx_dwords > USB4_DATA_DWORDS || rx_dwords > USB4_DATA_DWORDS)
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return -EINVAL;
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/*
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* If the connection manager implementation provides USB4 router
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* operation proxy callback, call it here instead of running the
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* operation natively.
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*/
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if (cm_ops->usb4_switch_op) {
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int ret;
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ret = cm_ops->usb4_switch_op(sw, opcode, metadata, status,
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tx_data, tx_dwords, rx_data,
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rx_dwords);
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if (ret != -EOPNOTSUPP)
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return ret;
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/*
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* If the proxy was not supported then run the native
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* router operation instead.
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*/
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}
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return usb4_native_switch_op(sw, opcode, metadata, status, tx_data,
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tx_dwords, rx_data, rx_dwords);
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}
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static inline int usb4_switch_op(struct tb_switch *sw, u16 opcode,
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u32 *metadata, u8 *status)
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{
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return __usb4_switch_op(sw, opcode, metadata, status, NULL, 0, NULL, 0);
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}
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static inline int usb4_switch_op_data(struct tb_switch *sw, u16 opcode,
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u32 *metadata, u8 *status,
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const void *tx_data, size_t tx_dwords,
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void *rx_data, size_t rx_dwords)
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{
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return __usb4_switch_op(sw, opcode, metadata, status, tx_data,
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tx_dwords, rx_data, rx_dwords);
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}
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/**
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* usb4_switch_check_wakes() - Check for wakes and notify PM core about them
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* @sw: Router whose wakes to check
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*
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* Checks wakes occurred during suspend and notify the PM core about them.
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*/
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void usb4_switch_check_wakes(struct tb_switch *sw)
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{
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bool wakeup_usb4 = false;
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struct usb4_port *usb4;
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struct tb_port *port;
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bool wakeup = false;
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u32 val;
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if (tb_route(sw)) {
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if (tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_6, 1))
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return;
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tb_sw_dbg(sw, "PCIe wake: %s, USB3 wake: %s\n",
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(val & ROUTER_CS_6_WOPS) ? "yes" : "no",
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(val & ROUTER_CS_6_WOUS) ? "yes" : "no");
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wakeup = val & (ROUTER_CS_6_WOPS | ROUTER_CS_6_WOUS);
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}
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/*
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* Check for any downstream ports for USB4 wake,
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* connection wake and disconnection wake.
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*/
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tb_switch_for_each_port(sw, port) {
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if (!port->cap_usb4)
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continue;
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if (tb_port_read(port, &val, TB_CFG_PORT,
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port->cap_usb4 + PORT_CS_18, 1))
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break;
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tb_port_dbg(port, "USB4 wake: %s, connection wake: %s, disconnection wake: %s\n",
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(val & PORT_CS_18_WOU4S) ? "yes" : "no",
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(val & PORT_CS_18_WOCS) ? "yes" : "no",
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(val & PORT_CS_18_WODS) ? "yes" : "no");
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wakeup_usb4 = val & (PORT_CS_18_WOU4S | PORT_CS_18_WOCS |
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PORT_CS_18_WODS);
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usb4 = port->usb4;
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if (device_may_wakeup(&usb4->dev) && wakeup_usb4)
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pm_wakeup_event(&usb4->dev, 0);
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wakeup |= wakeup_usb4;
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}
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if (wakeup)
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pm_wakeup_event(&sw->dev, 0);
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}
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static bool link_is_usb4(struct tb_port *port)
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{
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u32 val;
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if (!port->cap_usb4)
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return false;
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if (tb_port_read(port, &val, TB_CFG_PORT,
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port->cap_usb4 + PORT_CS_18, 1))
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return false;
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return !(val & PORT_CS_18_TCM);
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}
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/**
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* usb4_switch_setup() - Additional setup for USB4 device
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* @sw: USB4 router to setup
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*
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* USB4 routers need additional settings in order to enable all the
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* tunneling. This function enables USB and PCIe tunneling if it can be
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* enabled (e.g the parent switch also supports them). If USB tunneling
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* is not available for some reason (like that there is Thunderbolt 3
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* switch upstream) then the internal xHCI controller is enabled
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* instead.
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*
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* This does not set the configuration valid bit of the router. To do
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* that call usb4_switch_configuration_valid().
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*/
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int usb4_switch_setup(struct tb_switch *sw)
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{
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struct tb_switch *parent = tb_switch_parent(sw);
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struct tb_port *down;
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bool tbt3, xhci;
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u32 val = 0;
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int ret;
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if (!tb_route(sw))
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return 0;
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ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_6, 1);
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if (ret)
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return ret;
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down = tb_switch_downstream_port(sw);
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sw->link_usb4 = link_is_usb4(down);
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tb_sw_dbg(sw, "link: %s\n", sw->link_usb4 ? "USB4" : "TBT");
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xhci = val & ROUTER_CS_6_HCI;
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tbt3 = !(val & ROUTER_CS_6_TNS);
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tb_sw_dbg(sw, "TBT3 support: %s, xHCI: %s\n",
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tbt3 ? "yes" : "no", xhci ? "yes" : "no");
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ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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if (ret)
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return ret;
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if (tb_acpi_may_tunnel_usb3() && sw->link_usb4 &&
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tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
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val |= ROUTER_CS_5_UTO;
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xhci = false;
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}
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/*
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* Only enable PCIe tunneling if the parent router supports it
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* and it is not disabled.
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*/
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if (tb_acpi_may_tunnel_pcie() &&
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tb_switch_find_port(parent, TB_TYPE_PCIE_DOWN)) {
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val |= ROUTER_CS_5_PTO;
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/*
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* xHCI can be enabled if PCIe tunneling is supported
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* and the parent does not have any USB3 dowstream
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* adapters (so we cannot do USB 3.x tunneling).
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*/
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if (xhci)
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val |= ROUTER_CS_5_HCO;
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}
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/* TBT3 supported by the CM */
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val &= ~ROUTER_CS_5_CNS;
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return tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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}
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/**
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* usb4_switch_configuration_valid() - Set tunneling configuration to be valid
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* @sw: USB4 router
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*
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* Sets configuration valid bit for the router. Must be called before
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* any tunnels can be set through the router and after
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* usb4_switch_setup() has been called. Can be called to host and device
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* routers (does nothing for the latter).
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*
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* Returns %0 in success and negative errno otherwise.
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*/
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int usb4_switch_configuration_valid(struct tb_switch *sw)
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{
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u32 val;
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int ret;
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if (!tb_route(sw))
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return 0;
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ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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if (ret)
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return ret;
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val |= ROUTER_CS_5_CV;
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ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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if (ret)
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return ret;
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return tb_switch_wait_for_bit(sw, ROUTER_CS_6, ROUTER_CS_6_CR,
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ROUTER_CS_6_CR, 50);
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}
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/**
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* usb4_switch_read_uid() - Read UID from USB4 router
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* @sw: USB4 router
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* @uid: UID is stored here
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*
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* Reads 64-bit UID from USB4 router config space.
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*/
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int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid)
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{
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return tb_sw_read(sw, uid, TB_CFG_SWITCH, ROUTER_CS_7, 2);
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}
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static int usb4_switch_drom_read_block(void *data,
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unsigned int dwaddress, void *buf,
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size_t dwords)
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{
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struct tb_switch *sw = data;
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u8 status = 0;
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u32 metadata;
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int ret;
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metadata = (dwords << USB4_DROM_SIZE_SHIFT) & USB4_DROM_SIZE_MASK;
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metadata |= (dwaddress << USB4_DROM_ADDRESS_SHIFT) &
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USB4_DROM_ADDRESS_MASK;
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ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_DROM_READ, &metadata,
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&status, NULL, 0, buf, dwords);
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if (ret)
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return ret;
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return status ? -EIO : 0;
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}
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/**
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* usb4_switch_drom_read() - Read arbitrary bytes from USB4 router DROM
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* @sw: USB4 router
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* @address: Byte address inside DROM to start reading
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* @buf: Buffer where the DROM content is stored
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* @size: Number of bytes to read from DROM
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*
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* Uses USB4 router operations to read router DROM. For devices this
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* should always work but for hosts it may return %-EOPNOTSUPP in which
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* case the host router does not have DROM.
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*/
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int usb4_switch_drom_read(struct tb_switch *sw, unsigned int address, void *buf,
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size_t size)
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{
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return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
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usb4_switch_drom_read_block, sw);
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}
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/**
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* usb4_switch_lane_bonding_possible() - Are conditions met for lane bonding
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* @sw: USB4 router
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*
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* Checks whether conditions are met so that lane bonding can be
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* established with the upstream router. Call only for device routers.
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*/
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bool usb4_switch_lane_bonding_possible(struct tb_switch *sw)
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{
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struct tb_port *up;
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int ret;
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u32 val;
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up = tb_upstream_port(sw);
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ret = tb_port_read(up, &val, TB_CFG_PORT, up->cap_usb4 + PORT_CS_18, 1);
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if (ret)
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return false;
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return !!(val & PORT_CS_18_BE);
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}
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/**
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* usb4_switch_set_wake() - Enabled/disable wake
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* @sw: USB4 router
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* @flags: Wakeup flags (%0 to disable)
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*
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* Enables/disables router to wake up from sleep.
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*/
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int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags)
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{
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struct usb4_port *usb4;
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struct tb_port *port;
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u64 route = tb_route(sw);
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u32 val;
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int ret;
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/*
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* Enable wakes coming from all USB4 downstream ports (from
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* child routers). For device routers do this also for the
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* upstream USB4 port.
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*/
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tb_switch_for_each_port(sw, port) {
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if (!tb_port_is_null(port))
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continue;
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if (!route && tb_is_upstream_port(port))
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continue;
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if (!port->cap_usb4)
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continue;
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ret = tb_port_read(port, &val, TB_CFG_PORT,
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port->cap_usb4 + PORT_CS_19, 1);
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if (ret)
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return ret;
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val &= ~(PORT_CS_19_WOC | PORT_CS_19_WOD | PORT_CS_19_WOU4);
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if (tb_is_upstream_port(port)) {
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val |= PORT_CS_19_WOU4;
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} else {
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bool configured = val & PORT_CS_19_PC;
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usb4 = port->usb4;
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if (((flags & TB_WAKE_ON_CONNECT) |
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device_may_wakeup(&usb4->dev)) && !configured)
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val |= PORT_CS_19_WOC;
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if (((flags & TB_WAKE_ON_DISCONNECT) |
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device_may_wakeup(&usb4->dev)) && configured)
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val |= PORT_CS_19_WOD;
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if ((flags & TB_WAKE_ON_USB4) && configured)
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val |= PORT_CS_19_WOU4;
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}
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ret = tb_port_write(port, &val, TB_CFG_PORT,
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port->cap_usb4 + PORT_CS_19, 1);
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if (ret)
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return ret;
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}
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/*
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* Enable wakes from PCIe, USB 3.x and DP on this router. Only
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* needed for device routers.
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*/
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if (route) {
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ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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if (ret)
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return ret;
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val &= ~(ROUTER_CS_5_WOP | ROUTER_CS_5_WOU | ROUTER_CS_5_WOD);
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if (flags & TB_WAKE_ON_USB3)
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val |= ROUTER_CS_5_WOU;
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if (flags & TB_WAKE_ON_PCIE)
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val |= ROUTER_CS_5_WOP;
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if (flags & TB_WAKE_ON_DP)
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val |= ROUTER_CS_5_WOD;
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ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* usb4_switch_set_sleep() - Prepare the router to enter sleep
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* @sw: USB4 router
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*
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* Sets sleep bit for the router. Returns when the router sleep ready
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* bit has been asserted.
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*/
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int usb4_switch_set_sleep(struct tb_switch *sw)
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{
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int ret;
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u32 val;
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/* Set sleep bit and wait for sleep ready to be asserted */
|
|
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val |= ROUTER_CS_5_SLP;
|
|
|
|
ret = tb_sw_write(sw, &val, TB_CFG_SWITCH, ROUTER_CS_5, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tb_switch_wait_for_bit(sw, ROUTER_CS_6, ROUTER_CS_6_SLPR,
|
|
ROUTER_CS_6_SLPR, 500);
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_sector_size() - Return router NVM sector size
|
|
* @sw: USB4 router
|
|
*
|
|
* If the router supports NVM operations this function returns the NVM
|
|
* sector size in bytes. If NVM operations are not supported returns
|
|
* %-EOPNOTSUPP.
|
|
*/
|
|
int usb4_switch_nvm_sector_size(struct tb_switch *sw)
|
|
{
|
|
u32 metadata;
|
|
u8 status;
|
|
int ret;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_SECTOR_SIZE, &metadata,
|
|
&status);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (status)
|
|
return status == 0x2 ? -EOPNOTSUPP : -EIO;
|
|
|
|
return metadata & USB4_NVM_SECTOR_SIZE_MASK;
|
|
}
|
|
|
|
static int usb4_switch_nvm_read_block(void *data,
|
|
unsigned int dwaddress, void *buf, size_t dwords)
|
|
{
|
|
struct tb_switch *sw = data;
|
|
u8 status = 0;
|
|
u32 metadata;
|
|
int ret;
|
|
|
|
metadata = (dwords << USB4_NVM_READ_LENGTH_SHIFT) &
|
|
USB4_NVM_READ_LENGTH_MASK;
|
|
metadata |= (dwaddress << USB4_NVM_READ_OFFSET_SHIFT) &
|
|
USB4_NVM_READ_OFFSET_MASK;
|
|
|
|
ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_NVM_READ, &metadata,
|
|
&status, NULL, 0, buf, dwords);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return status ? -EIO : 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_read() - Read arbitrary bytes from router NVM
|
|
* @sw: USB4 router
|
|
* @address: Starting address in bytes
|
|
* @buf: Read data is placed here
|
|
* @size: How many bytes to read
|
|
*
|
|
* Reads NVM contents of the router. If NVM is not supported returns
|
|
* %-EOPNOTSUPP.
|
|
*/
|
|
int usb4_switch_nvm_read(struct tb_switch *sw, unsigned int address, void *buf,
|
|
size_t size)
|
|
{
|
|
return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
|
|
usb4_switch_nvm_read_block, sw);
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_set_offset() - Set NVM write offset
|
|
* @sw: USB4 router
|
|
* @address: Start offset
|
|
*
|
|
* Explicitly sets NVM write offset. Normally when writing to NVM this
|
|
* is done automatically by usb4_switch_nvm_write().
|
|
*
|
|
* Returns %0 in success and negative errno if there was a failure.
|
|
*/
|
|
int usb4_switch_nvm_set_offset(struct tb_switch *sw, unsigned int address)
|
|
{
|
|
u32 metadata, dwaddress;
|
|
u8 status = 0;
|
|
int ret;
|
|
|
|
dwaddress = address / 4;
|
|
metadata = (dwaddress << USB4_NVM_SET_OFFSET_SHIFT) &
|
|
USB4_NVM_SET_OFFSET_MASK;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_SET_OFFSET, &metadata,
|
|
&status);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return status ? -EIO : 0;
|
|
}
|
|
|
|
static int usb4_switch_nvm_write_next_block(void *data, unsigned int dwaddress,
|
|
const void *buf, size_t dwords)
|
|
{
|
|
struct tb_switch *sw = data;
|
|
u8 status;
|
|
int ret;
|
|
|
|
ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_NVM_WRITE, NULL, &status,
|
|
buf, dwords, NULL, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return status ? -EIO : 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_write() - Write to the router NVM
|
|
* @sw: USB4 router
|
|
* @address: Start address where to write in bytes
|
|
* @buf: Pointer to the data to write
|
|
* @size: Size of @buf in bytes
|
|
*
|
|
* Writes @buf to the router NVM using USB4 router operations. If NVM
|
|
* write is not supported returns %-EOPNOTSUPP.
|
|
*/
|
|
int usb4_switch_nvm_write(struct tb_switch *sw, unsigned int address,
|
|
const void *buf, size_t size)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_switch_nvm_set_offset(sw, address);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tb_nvm_write_data(address, buf, size, USB4_DATA_RETRIES,
|
|
usb4_switch_nvm_write_next_block, sw);
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_authenticate() - Authenticate new NVM
|
|
* @sw: USB4 router
|
|
*
|
|
* After the new NVM has been written via usb4_switch_nvm_write(), this
|
|
* function triggers NVM authentication process. The router gets power
|
|
* cycled and if the authentication is successful the new NVM starts
|
|
* running. In case of failure returns negative errno.
|
|
*
|
|
* The caller should call usb4_switch_nvm_authenticate_status() to read
|
|
* the status of the authentication after power cycle. It should be the
|
|
* first router operation to avoid the status being lost.
|
|
*/
|
|
int usb4_switch_nvm_authenticate(struct tb_switch *sw)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_NVM_AUTH, NULL, NULL);
|
|
switch (ret) {
|
|
/*
|
|
* The router is power cycled once NVM_AUTH is started so it is
|
|
* expected to get any of the following errors back.
|
|
*/
|
|
case -EACCES:
|
|
case -ENOTCONN:
|
|
case -ETIMEDOUT:
|
|
return 0;
|
|
|
|
default:
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_nvm_authenticate_status() - Read status of last NVM authenticate
|
|
* @sw: USB4 router
|
|
* @status: Status code of the operation
|
|
*
|
|
* The function checks if there is status available from the last NVM
|
|
* authenticate router operation. If there is status then %0 is returned
|
|
* and the status code is placed in @status. Returns negative errno in case
|
|
* of failure.
|
|
*
|
|
* Must be called before any other router operation.
|
|
*/
|
|
int usb4_switch_nvm_authenticate_status(struct tb_switch *sw, u32 *status)
|
|
{
|
|
const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
|
|
u16 opcode;
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (cm_ops->usb4_switch_nvm_authenticate_status) {
|
|
ret = cm_ops->usb4_switch_nvm_authenticate_status(sw, status);
|
|
if (ret != -EOPNOTSUPP)
|
|
return ret;
|
|
}
|
|
|
|
ret = tb_sw_read(sw, &val, TB_CFG_SWITCH, ROUTER_CS_26, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Check that the opcode is correct */
|
|
opcode = val & ROUTER_CS_26_OPCODE_MASK;
|
|
if (opcode == USB4_SWITCH_OP_NVM_AUTH) {
|
|
if (val & ROUTER_CS_26_OV)
|
|
return -EBUSY;
|
|
if (val & ROUTER_CS_26_ONS)
|
|
return -EOPNOTSUPP;
|
|
|
|
*status = (val & ROUTER_CS_26_STATUS_MASK) >>
|
|
ROUTER_CS_26_STATUS_SHIFT;
|
|
} else {
|
|
*status = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_credits_init() - Read buffer allocation parameters
|
|
* @sw: USB4 router
|
|
*
|
|
* Reads @sw buffer allocation parameters and initializes @sw buffer
|
|
* allocation fields accordingly. Specifically @sw->credits_allocation
|
|
* is set to %true if these parameters can be used in tunneling.
|
|
*
|
|
* Returns %0 on success and negative errno otherwise.
|
|
*/
|
|
int usb4_switch_credits_init(struct tb_switch *sw)
|
|
{
|
|
int max_usb3, min_dp_aux, min_dp_main, max_pcie, max_dma;
|
|
int ret, length, i, nports;
|
|
const struct tb_port *port;
|
|
u32 data[USB4_DATA_DWORDS];
|
|
u32 metadata = 0;
|
|
u8 status = 0;
|
|
|
|
memset(data, 0, sizeof(data));
|
|
ret = usb4_switch_op_data(sw, USB4_SWITCH_OP_BUFFER_ALLOC, &metadata,
|
|
&status, NULL, 0, data, ARRAY_SIZE(data));
|
|
if (ret)
|
|
return ret;
|
|
if (status)
|
|
return -EIO;
|
|
|
|
length = metadata & USB4_BA_LENGTH_MASK;
|
|
if (WARN_ON(length > ARRAY_SIZE(data)))
|
|
return -EMSGSIZE;
|
|
|
|
max_usb3 = -1;
|
|
min_dp_aux = -1;
|
|
min_dp_main = -1;
|
|
max_pcie = -1;
|
|
max_dma = -1;
|
|
|
|
tb_sw_dbg(sw, "credit allocation parameters:\n");
|
|
|
|
for (i = 0; i < length; i++) {
|
|
u16 index, value;
|
|
|
|
index = data[i] & USB4_BA_INDEX_MASK;
|
|
value = (data[i] & USB4_BA_VALUE_MASK) >> USB4_BA_VALUE_SHIFT;
|
|
|
|
switch (index) {
|
|
case USB4_BA_MAX_USB3:
|
|
tb_sw_dbg(sw, " USB3: %u\n", value);
|
|
max_usb3 = value;
|
|
break;
|
|
case USB4_BA_MIN_DP_AUX:
|
|
tb_sw_dbg(sw, " DP AUX: %u\n", value);
|
|
min_dp_aux = value;
|
|
break;
|
|
case USB4_BA_MIN_DP_MAIN:
|
|
tb_sw_dbg(sw, " DP main: %u\n", value);
|
|
min_dp_main = value;
|
|
break;
|
|
case USB4_BA_MAX_PCIE:
|
|
tb_sw_dbg(sw, " PCIe: %u\n", value);
|
|
max_pcie = value;
|
|
break;
|
|
case USB4_BA_MAX_HI:
|
|
tb_sw_dbg(sw, " DMA: %u\n", value);
|
|
max_dma = value;
|
|
break;
|
|
default:
|
|
tb_sw_dbg(sw, " unknown credit allocation index %#x, skipping\n",
|
|
index);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Validate the buffer allocation preferences. If we find
|
|
* issues, log a warning and fall back using the hard-coded
|
|
* values.
|
|
*/
|
|
|
|
/* Host router must report baMaxHI */
|
|
if (!tb_route(sw) && max_dma < 0) {
|
|
tb_sw_warn(sw, "host router is missing baMaxHI\n");
|
|
goto err_invalid;
|
|
}
|
|
|
|
nports = 0;
|
|
tb_switch_for_each_port(sw, port) {
|
|
if (tb_port_is_null(port))
|
|
nports++;
|
|
}
|
|
|
|
/* Must have DP buffer allocation (multiple USB4 ports) */
|
|
if (nports > 2 && (min_dp_aux < 0 || min_dp_main < 0)) {
|
|
tb_sw_warn(sw, "multiple USB4 ports require baMinDPaux/baMinDPmain\n");
|
|
goto err_invalid;
|
|
}
|
|
|
|
tb_switch_for_each_port(sw, port) {
|
|
if (tb_port_is_dpout(port) && min_dp_main < 0) {
|
|
tb_sw_warn(sw, "missing baMinDPmain");
|
|
goto err_invalid;
|
|
}
|
|
if ((tb_port_is_dpin(port) || tb_port_is_dpout(port)) &&
|
|
min_dp_aux < 0) {
|
|
tb_sw_warn(sw, "missing baMinDPaux");
|
|
goto err_invalid;
|
|
}
|
|
if ((tb_port_is_usb3_down(port) || tb_port_is_usb3_up(port)) &&
|
|
max_usb3 < 0) {
|
|
tb_sw_warn(sw, "missing baMaxUSB3");
|
|
goto err_invalid;
|
|
}
|
|
if ((tb_port_is_pcie_down(port) || tb_port_is_pcie_up(port)) &&
|
|
max_pcie < 0) {
|
|
tb_sw_warn(sw, "missing baMaxPCIe");
|
|
goto err_invalid;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Buffer allocation passed the validation so we can use it in
|
|
* path creation.
|
|
*/
|
|
sw->credit_allocation = true;
|
|
if (max_usb3 > 0)
|
|
sw->max_usb3_credits = max_usb3;
|
|
if (min_dp_aux > 0)
|
|
sw->min_dp_aux_credits = min_dp_aux;
|
|
if (min_dp_main > 0)
|
|
sw->min_dp_main_credits = min_dp_main;
|
|
if (max_pcie > 0)
|
|
sw->max_pcie_credits = max_pcie;
|
|
if (max_dma > 0)
|
|
sw->max_dma_credits = max_dma;
|
|
|
|
return 0;
|
|
|
|
err_invalid:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_query_dp_resource() - Query availability of DP IN resource
|
|
* @sw: USB4 router
|
|
* @in: DP IN adapter
|
|
*
|
|
* For DP tunneling this function can be used to query availability of
|
|
* DP IN resource. Returns true if the resource is available for DP
|
|
* tunneling, false otherwise.
|
|
*/
|
|
bool usb4_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
|
|
{
|
|
u32 metadata = in->port;
|
|
u8 status;
|
|
int ret;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_QUERY_DP_RESOURCE, &metadata,
|
|
&status);
|
|
/*
|
|
* If DP resource allocation is not supported assume it is
|
|
* always available.
|
|
*/
|
|
if (ret == -EOPNOTSUPP)
|
|
return true;
|
|
if (ret)
|
|
return false;
|
|
|
|
return !status;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_alloc_dp_resource() - Allocate DP IN resource
|
|
* @sw: USB4 router
|
|
* @in: DP IN adapter
|
|
*
|
|
* Allocates DP IN resource for DP tunneling using USB4 router
|
|
* operations. If the resource was allocated returns %0. Otherwise
|
|
* returns negative errno, in particular %-EBUSY if the resource is
|
|
* already allocated.
|
|
*/
|
|
int usb4_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
|
|
{
|
|
u32 metadata = in->port;
|
|
u8 status;
|
|
int ret;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_ALLOC_DP_RESOURCE, &metadata,
|
|
&status);
|
|
if (ret == -EOPNOTSUPP)
|
|
return 0;
|
|
if (ret)
|
|
return ret;
|
|
|
|
return status ? -EBUSY : 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_dealloc_dp_resource() - Releases allocated DP IN resource
|
|
* @sw: USB4 router
|
|
* @in: DP IN adapter
|
|
*
|
|
* Releases the previously allocated DP IN resource.
|
|
*/
|
|
int usb4_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
|
|
{
|
|
u32 metadata = in->port;
|
|
u8 status;
|
|
int ret;
|
|
|
|
ret = usb4_switch_op(sw, USB4_SWITCH_OP_DEALLOC_DP_RESOURCE, &metadata,
|
|
&status);
|
|
if (ret == -EOPNOTSUPP)
|
|
return 0;
|
|
if (ret)
|
|
return ret;
|
|
|
|
return status ? -EIO : 0;
|
|
}
|
|
|
|
static int usb4_port_idx(const struct tb_switch *sw, const struct tb_port *port)
|
|
{
|
|
struct tb_port *p;
|
|
int usb4_idx = 0;
|
|
|
|
/* Assume port is primary */
|
|
tb_switch_for_each_port(sw, p) {
|
|
if (!tb_port_is_null(p))
|
|
continue;
|
|
if (tb_is_upstream_port(p))
|
|
continue;
|
|
if (!p->link_nr) {
|
|
if (p == port)
|
|
break;
|
|
usb4_idx++;
|
|
}
|
|
}
|
|
|
|
return usb4_idx;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_map_pcie_down() - Map USB4 port to a PCIe downstream adapter
|
|
* @sw: USB4 router
|
|
* @port: USB4 port
|
|
*
|
|
* USB4 routers have direct mapping between USB4 ports and PCIe
|
|
* downstream adapters where the PCIe topology is extended. This
|
|
* function returns the corresponding downstream PCIe adapter or %NULL
|
|
* if no such mapping was possible.
|
|
*/
|
|
struct tb_port *usb4_switch_map_pcie_down(struct tb_switch *sw,
|
|
const struct tb_port *port)
|
|
{
|
|
int usb4_idx = usb4_port_idx(sw, port);
|
|
struct tb_port *p;
|
|
int pcie_idx = 0;
|
|
|
|
/* Find PCIe down port matching usb4_port */
|
|
tb_switch_for_each_port(sw, p) {
|
|
if (!tb_port_is_pcie_down(p))
|
|
continue;
|
|
|
|
if (pcie_idx == usb4_idx)
|
|
return p;
|
|
|
|
pcie_idx++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_map_usb3_down() - Map USB4 port to a USB3 downstream adapter
|
|
* @sw: USB4 router
|
|
* @port: USB4 port
|
|
*
|
|
* USB4 routers have direct mapping between USB4 ports and USB 3.x
|
|
* downstream adapters where the USB 3.x topology is extended. This
|
|
* function returns the corresponding downstream USB 3.x adapter or
|
|
* %NULL if no such mapping was possible.
|
|
*/
|
|
struct tb_port *usb4_switch_map_usb3_down(struct tb_switch *sw,
|
|
const struct tb_port *port)
|
|
{
|
|
int usb4_idx = usb4_port_idx(sw, port);
|
|
struct tb_port *p;
|
|
int usb_idx = 0;
|
|
|
|
/* Find USB3 down port matching usb4_port */
|
|
tb_switch_for_each_port(sw, p) {
|
|
if (!tb_port_is_usb3_down(p))
|
|
continue;
|
|
|
|
if (usb_idx == usb4_idx)
|
|
return p;
|
|
|
|
usb_idx++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_add_ports() - Add USB4 ports for this router
|
|
* @sw: USB4 router
|
|
*
|
|
* For USB4 router finds all USB4 ports and registers devices for each.
|
|
* Can be called to any router.
|
|
*
|
|
* Return %0 in case of success and negative errno in case of failure.
|
|
*/
|
|
int usb4_switch_add_ports(struct tb_switch *sw)
|
|
{
|
|
struct tb_port *port;
|
|
|
|
if (tb_switch_is_icm(sw) || !tb_switch_is_usb4(sw))
|
|
return 0;
|
|
|
|
tb_switch_for_each_port(sw, port) {
|
|
struct usb4_port *usb4;
|
|
|
|
if (!tb_port_is_null(port))
|
|
continue;
|
|
if (!port->cap_usb4)
|
|
continue;
|
|
|
|
usb4 = usb4_port_device_add(port);
|
|
if (IS_ERR(usb4)) {
|
|
usb4_switch_remove_ports(sw);
|
|
return PTR_ERR(usb4);
|
|
}
|
|
|
|
port->usb4 = usb4;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_switch_remove_ports() - Removes USB4 ports from this router
|
|
* @sw: USB4 router
|
|
*
|
|
* Unregisters previously registered USB4 ports.
|
|
*/
|
|
void usb4_switch_remove_ports(struct tb_switch *sw)
|
|
{
|
|
struct tb_port *port;
|
|
|
|
tb_switch_for_each_port(sw, port) {
|
|
if (port->usb4) {
|
|
usb4_port_device_remove(port->usb4);
|
|
port->usb4 = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* usb4_port_unlock() - Unlock USB4 downstream port
|
|
* @port: USB4 port to unlock
|
|
*
|
|
* Unlocks USB4 downstream port so that the connection manager can
|
|
* access the router below this port.
|
|
*/
|
|
int usb4_port_unlock(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT, ADP_CS_4, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_CS_4_LCK;
|
|
return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_4, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_hotplug_enable() - Enables hotplug for a port
|
|
* @port: USB4 port to operate on
|
|
*
|
|
* Enables hot plug events on a given port. This is only intended
|
|
* to be used on lane, DP-IN, and DP-OUT adapters.
|
|
*/
|
|
int usb4_port_hotplug_enable(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT, ADP_CS_5, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_CS_5_DHP;
|
|
return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_5, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_reset() - Issue downstream port reset
|
|
* @port: USB4 port to reset
|
|
*
|
|
* Issues downstream port reset to @port.
|
|
*/
|
|
int usb4_port_reset(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val |= PORT_CS_19_DPR;
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
fsleep(10000);
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~PORT_CS_19_DPR;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
}
|
|
|
|
static int usb4_port_set_configured(struct tb_port *port, bool configured)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (configured)
|
|
val |= PORT_CS_19_PC;
|
|
else
|
|
val &= ~PORT_CS_19_PC;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_configure() - Set USB4 port configured
|
|
* @port: USB4 router
|
|
*
|
|
* Sets the USB4 link to be configured for power management purposes.
|
|
*/
|
|
int usb4_port_configure(struct tb_port *port)
|
|
{
|
|
return usb4_port_set_configured(port, true);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_unconfigure() - Set USB4 port unconfigured
|
|
* @port: USB4 router
|
|
*
|
|
* Sets the USB4 link to be unconfigured for power management purposes.
|
|
*/
|
|
void usb4_port_unconfigure(struct tb_port *port)
|
|
{
|
|
usb4_port_set_configured(port, false);
|
|
}
|
|
|
|
static int usb4_set_xdomain_configured(struct tb_port *port, bool configured)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (configured)
|
|
val |= PORT_CS_19_PID;
|
|
else
|
|
val &= ~PORT_CS_19_PID;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_configure_xdomain() - Configure port for XDomain
|
|
* @port: USB4 port connected to another host
|
|
* @xd: XDomain that is connected to the port
|
|
*
|
|
* Marks the USB4 port as being connected to another host and updates
|
|
* the link type. Returns %0 in success and negative errno in failure.
|
|
*/
|
|
int usb4_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd)
|
|
{
|
|
xd->link_usb4 = link_is_usb4(port);
|
|
return usb4_set_xdomain_configured(port, true);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_unconfigure_xdomain() - Unconfigure port for XDomain
|
|
* @port: USB4 port that was connected to another host
|
|
*
|
|
* Clears USB4 port from being marked as XDomain.
|
|
*/
|
|
void usb4_port_unconfigure_xdomain(struct tb_port *port)
|
|
{
|
|
usb4_set_xdomain_configured(port, false);
|
|
}
|
|
|
|
static int usb4_port_wait_for_bit(struct tb_port *port, u32 offset, u32 bit,
|
|
u32 value, int timeout_msec, unsigned long delay_usec)
|
|
{
|
|
ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec);
|
|
|
|
do {
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT, offset, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if ((val & bit) == value)
|
|
return 0;
|
|
|
|
fsleep(delay_usec);
|
|
} while (ktime_before(ktime_get(), timeout));
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int usb4_port_read_data(struct tb_port *port, void *data, size_t dwords)
|
|
{
|
|
if (dwords > USB4_DATA_DWORDS)
|
|
return -EINVAL;
|
|
|
|
return tb_port_read(port, data, TB_CFG_PORT, port->cap_usb4 + PORT_CS_2,
|
|
dwords);
|
|
}
|
|
|
|
static int usb4_port_write_data(struct tb_port *port, const void *data,
|
|
size_t dwords)
|
|
{
|
|
if (dwords > USB4_DATA_DWORDS)
|
|
return -EINVAL;
|
|
|
|
return tb_port_write(port, data, TB_CFG_PORT, port->cap_usb4 + PORT_CS_2,
|
|
dwords);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_sb_read() - Read from sideband register
|
|
* @port: USB4 port to read
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @reg: Sideband register index
|
|
* @buf: Buffer where the sideband data is copied
|
|
* @size: Size of @buf
|
|
*
|
|
* Reads data from sideband register @reg and copies it into @buf.
|
|
* Returns %0 in case of success and negative errno in case of failure.
|
|
*/
|
|
int usb4_port_sb_read(struct tb_port *port, enum usb4_sb_target target, u8 index,
|
|
u8 reg, void *buf, u8 size)
|
|
{
|
|
size_t dwords = DIV_ROUND_UP(size, 4);
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return -EINVAL;
|
|
|
|
val = reg;
|
|
val |= size << PORT_CS_1_LENGTH_SHIFT;
|
|
val |= (target << PORT_CS_1_TARGET_SHIFT) & PORT_CS_1_TARGET_MASK;
|
|
if (target == USB4_SB_TARGET_RETIMER)
|
|
val |= (index << PORT_CS_1_RETIMER_INDEX_SHIFT);
|
|
val |= PORT_CS_1_PND;
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_1,
|
|
PORT_CS_1_PND, 0, 500, USB4_PORT_SB_DELAY);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val & PORT_CS_1_NR)
|
|
return -ENODEV;
|
|
if (val & PORT_CS_1_RC)
|
|
return -EIO;
|
|
|
|
return buf ? usb4_port_read_data(port, buf, dwords) : 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_port_sb_write() - Write to sideband register
|
|
* @port: USB4 port to write
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @reg: Sideband register index
|
|
* @buf: Data to write
|
|
* @size: Size of @buf
|
|
*
|
|
* Writes @buf to sideband register @reg. Returns %0 in case of success
|
|
* and negative errno in case of failure.
|
|
*/
|
|
int usb4_port_sb_write(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, u8 reg, const void *buf, u8 size)
|
|
{
|
|
size_t dwords = DIV_ROUND_UP(size, 4);
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return -EINVAL;
|
|
|
|
if (buf) {
|
|
ret = usb4_port_write_data(port, buf, dwords);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
val = reg;
|
|
val |= size << PORT_CS_1_LENGTH_SHIFT;
|
|
val |= PORT_CS_1_WNR_WRITE;
|
|
val |= (target << PORT_CS_1_TARGET_SHIFT) & PORT_CS_1_TARGET_MASK;
|
|
if (target == USB4_SB_TARGET_RETIMER)
|
|
val |= (index << PORT_CS_1_RETIMER_INDEX_SHIFT);
|
|
val |= PORT_CS_1_PND;
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_1,
|
|
PORT_CS_1_PND, 0, 500, USB4_PORT_SB_DELAY);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val & PORT_CS_1_NR)
|
|
return -ENODEV;
|
|
if (val & PORT_CS_1_RC)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb4_port_sb_opcode_err_to_errno(u32 val)
|
|
{
|
|
switch (val) {
|
|
case 0:
|
|
return 0;
|
|
case USB4_SB_OPCODE_ERR:
|
|
return -EAGAIN;
|
|
case USB4_SB_OPCODE_ONS:
|
|
return -EOPNOTSUPP;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
static int usb4_port_sb_op(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, enum usb4_sb_opcode opcode, int timeout_msec)
|
|
{
|
|
ktime_t timeout;
|
|
u32 val;
|
|
int ret;
|
|
|
|
val = opcode;
|
|
ret = usb4_port_sb_write(port, target, index, USB4_SB_OPCODE, &val,
|
|
sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
timeout = ktime_add_ms(ktime_get(), timeout_msec);
|
|
|
|
do {
|
|
/* Check results */
|
|
ret = usb4_port_sb_read(port, target, index, USB4_SB_OPCODE,
|
|
&val, sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (val != opcode)
|
|
return usb4_port_sb_opcode_err_to_errno(val);
|
|
|
|
fsleep(USB4_PORT_SB_DELAY);
|
|
} while (ktime_before(ktime_get(), timeout));
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int usb4_port_set_router_offline(struct tb_port *port, bool offline)
|
|
{
|
|
u32 val = !offline;
|
|
int ret;
|
|
|
|
ret = usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
|
|
USB4_SB_METADATA, &val, sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = USB4_SB_OPCODE_ROUTER_OFFLINE;
|
|
return usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
|
|
USB4_SB_OPCODE, &val, sizeof(val));
|
|
}
|
|
|
|
/**
|
|
* usb4_port_router_offline() - Put the USB4 port to offline mode
|
|
* @port: USB4 port
|
|
*
|
|
* This function puts the USB4 port into offline mode. In this mode the
|
|
* port does not react on hotplug events anymore. This needs to be
|
|
* called before retimer access is done when the USB4 links is not up.
|
|
*
|
|
* Returns %0 in case of success and negative errno if there was an
|
|
* error.
|
|
*/
|
|
int usb4_port_router_offline(struct tb_port *port)
|
|
{
|
|
return usb4_port_set_router_offline(port, true);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_router_online() - Put the USB4 port back to online
|
|
* @port: USB4 port
|
|
*
|
|
* Makes the USB4 port functional again.
|
|
*/
|
|
int usb4_port_router_online(struct tb_port *port)
|
|
{
|
|
return usb4_port_set_router_offline(port, false);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_enumerate_retimers() - Send RT broadcast transaction
|
|
* @port: USB4 port
|
|
*
|
|
* This forces the USB4 port to send broadcast RT transaction which
|
|
* makes the retimers on the link to assign index to themselves. Returns
|
|
* %0 in case of success and negative errno if there was an error.
|
|
*/
|
|
int usb4_port_enumerate_retimers(struct tb_port *port)
|
|
{
|
|
u32 val;
|
|
|
|
val = USB4_SB_OPCODE_ENUMERATE_RETIMERS;
|
|
return usb4_port_sb_write(port, USB4_SB_TARGET_ROUTER, 0,
|
|
USB4_SB_OPCODE, &val, sizeof(val));
|
|
}
|
|
|
|
/**
|
|
* usb4_port_clx_supported() - Check if CLx is supported by the link
|
|
* @port: Port to check for CLx support for
|
|
*
|
|
* PORT_CS_18_CPS bit reflects if the link supports CLx including
|
|
* active cables (if connected on the link).
|
|
*/
|
|
bool usb4_port_clx_supported(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_18, 1);
|
|
if (ret)
|
|
return false;
|
|
|
|
return !!(val & PORT_CS_18_CPS);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_asym_supported() - If the port supports asymmetric link
|
|
* @port: USB4 port
|
|
*
|
|
* Checks if the port and the cable supports asymmetric link and returns
|
|
* %true in that case.
|
|
*/
|
|
bool usb4_port_asym_supported(struct tb_port *port)
|
|
{
|
|
u32 val;
|
|
|
|
if (!port->cap_usb4)
|
|
return false;
|
|
|
|
if (tb_port_read(port, &val, TB_CFG_PORT, port->cap_usb4 + PORT_CS_18, 1))
|
|
return false;
|
|
|
|
return !!(val & PORT_CS_18_CSA);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_asym_set_link_width() - Set link width to asymmetric or symmetric
|
|
* @port: USB4 port
|
|
* @width: Asymmetric width to configure
|
|
*
|
|
* Sets USB4 port link width to @width. Can be called for widths where
|
|
* usb4_port_asym_width_supported() returned @true.
|
|
*/
|
|
int usb4_port_asym_set_link_width(struct tb_port *port, enum tb_link_width width)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!port->cap_phy)
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_phy + LANE_ADP_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~LANE_ADP_CS_1_TARGET_WIDTH_ASYM_MASK;
|
|
switch (width) {
|
|
case TB_LINK_WIDTH_DUAL:
|
|
val |= FIELD_PREP(LANE_ADP_CS_1_TARGET_WIDTH_ASYM_MASK,
|
|
LANE_ADP_CS_1_TARGET_WIDTH_ASYM_DUAL);
|
|
break;
|
|
case TB_LINK_WIDTH_ASYM_TX:
|
|
val |= FIELD_PREP(LANE_ADP_CS_1_TARGET_WIDTH_ASYM_MASK,
|
|
LANE_ADP_CS_1_TARGET_WIDTH_ASYM_TX);
|
|
break;
|
|
case TB_LINK_WIDTH_ASYM_RX:
|
|
val |= FIELD_PREP(LANE_ADP_CS_1_TARGET_WIDTH_ASYM_MASK,
|
|
LANE_ADP_CS_1_TARGET_WIDTH_ASYM_RX);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_phy + LANE_ADP_CS_1, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_asym_start() - Start symmetry change and wait for completion
|
|
* @port: USB4 port
|
|
*
|
|
* Start symmetry change of the link to asymmetric or symmetric
|
|
* (according to what was previously set in tb_port_set_link_width().
|
|
* Wait for completion of the change.
|
|
*
|
|
* Returns %0 in case of success, %-ETIMEDOUT if case of timeout or
|
|
* a negative errno in case of a failure.
|
|
*/
|
|
int usb4_port_asym_start(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~PORT_CS_19_START_ASYM;
|
|
val |= FIELD_PREP(PORT_CS_19_START_ASYM, 1);
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_usb4 + PORT_CS_19, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Wait for PORT_CS_19_START_ASYM to be 0. This means the USB4
|
|
* port started the symmetry transition.
|
|
*/
|
|
ret = usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_19,
|
|
PORT_CS_19_START_ASYM, 0, 1000,
|
|
USB4_PORT_DELAY);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Then wait for the transtion to be completed */
|
|
return usb4_port_wait_for_bit(port, port->cap_usb4 + PORT_CS_18,
|
|
PORT_CS_18_TIP, 0, 5000, USB4_PORT_DELAY);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_margining_caps() - Read USB4 port marginig capabilities
|
|
* @port: USB4 port
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @caps: Array with at least two elements to hold the results
|
|
*
|
|
* Reads the USB4 port lane margining capabilities into @caps.
|
|
*/
|
|
int usb4_port_margining_caps(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, u32 *caps)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_port_sb_op(port, target, index,
|
|
USB4_SB_OPCODE_READ_LANE_MARGINING_CAP, 500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_sb_read(port, target, index, USB4_SB_DATA, caps,
|
|
sizeof(*caps) * 2);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_hw_margin() - Run hardware lane margining on port
|
|
* @port: USB4 port
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @params: Parameters for USB4 hardware margining
|
|
* @results: Array with at least two elements to hold the results
|
|
*
|
|
* Runs hardware lane margining on USB4 port and returns the result in
|
|
* @results.
|
|
*/
|
|
int usb4_port_hw_margin(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, const struct usb4_port_margining_params *params,
|
|
u32 *results)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (WARN_ON_ONCE(!params))
|
|
return -EINVAL;
|
|
|
|
val = params->lanes;
|
|
if (params->time)
|
|
val |= USB4_MARGIN_HW_TIME;
|
|
if (params->right_high)
|
|
val |= USB4_MARGIN_HW_RH;
|
|
if (params->ber_level)
|
|
val |= FIELD_PREP(USB4_MARGIN_HW_BER_MASK, params->ber_level);
|
|
if (params->optional_voltage_offset_range)
|
|
val |= USB4_MARGIN_HW_OPT_VOLTAGE;
|
|
|
|
ret = usb4_port_sb_write(port, target, index, USB4_SB_METADATA, &val,
|
|
sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_op(port, target, index,
|
|
USB4_SB_OPCODE_RUN_HW_LANE_MARGINING, 2500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_sb_read(port, target, index, USB4_SB_DATA, results,
|
|
sizeof(*results) * 2);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_sw_margin() - Run software lane margining on port
|
|
* @port: USB4 port
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @params: Parameters for USB4 software margining
|
|
* @results: Data word for the operation completion data
|
|
*
|
|
* Runs software lane margining on USB4 port. Read back the error
|
|
* counters by calling usb4_port_sw_margin_errors(). Returns %0 in
|
|
* success and negative errno otherwise.
|
|
*/
|
|
int usb4_port_sw_margin(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, const struct usb4_port_margining_params *params,
|
|
u32 *results)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (WARN_ON_ONCE(!params))
|
|
return -EINVAL;
|
|
|
|
val = params->lanes;
|
|
if (params->time)
|
|
val |= USB4_MARGIN_SW_TIME;
|
|
if (params->optional_voltage_offset_range)
|
|
val |= USB4_MARGIN_SW_OPT_VOLTAGE;
|
|
if (params->right_high)
|
|
val |= USB4_MARGIN_SW_RH;
|
|
val |= FIELD_PREP(USB4_MARGIN_SW_COUNTER_MASK, params->error_counter);
|
|
val |= FIELD_PREP(USB4_MARGIN_SW_VT_MASK, params->voltage_time_offset);
|
|
|
|
ret = usb4_port_sb_write(port, target, index, USB4_SB_METADATA, &val,
|
|
sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_op(port, target, index,
|
|
USB4_SB_OPCODE_RUN_SW_LANE_MARGINING, 2500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_sb_read(port, target, index, USB4_SB_DATA, results,
|
|
sizeof(*results));
|
|
|
|
}
|
|
|
|
/**
|
|
* usb4_port_sw_margin_errors() - Read the software margining error counters
|
|
* @port: USB4 port
|
|
* @target: Sideband target
|
|
* @index: Retimer index if taget is %USB4_SB_TARGET_RETIMER
|
|
* @errors: Error metadata is copied here.
|
|
*
|
|
* This reads back the software margining error counters from the port.
|
|
* Returns %0 in success and negative errno otherwise.
|
|
*/
|
|
int usb4_port_sw_margin_errors(struct tb_port *port, enum usb4_sb_target target,
|
|
u8 index, u32 *errors)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_port_sb_op(port, target, index,
|
|
USB4_SB_OPCODE_READ_SW_MARGIN_ERR, 150);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_sb_read(port, target, index, USB4_SB_METADATA, errors,
|
|
sizeof(*errors));
|
|
}
|
|
|
|
static inline int usb4_port_retimer_op(struct tb_port *port, u8 index,
|
|
enum usb4_sb_opcode opcode,
|
|
int timeout_msec)
|
|
{
|
|
return usb4_port_sb_op(port, USB4_SB_TARGET_RETIMER, index, opcode,
|
|
timeout_msec);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_set_inbound_sbtx() - Enable sideband channel transactions
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* Enables sideband channel transations on SBTX. Can be used when USB4
|
|
* link does not go up, for example if there is no device connected.
|
|
*/
|
|
int usb4_port_retimer_set_inbound_sbtx(struct tb_port *port, u8 index)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX,
|
|
500);
|
|
|
|
if (ret != -ENODEV)
|
|
return ret;
|
|
|
|
/*
|
|
* Per the USB4 retimer spec, the retimer is not required to
|
|
* send an RT (Retimer Transaction) response for the first
|
|
* SET_INBOUND_SBTX command
|
|
*/
|
|
return usb4_port_retimer_op(port, index, USB4_SB_OPCODE_SET_INBOUND_SBTX,
|
|
500);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_unset_inbound_sbtx() - Disable sideband channel transactions
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* Disables sideband channel transations on SBTX. The reverse of
|
|
* usb4_port_retimer_set_inbound_sbtx().
|
|
*/
|
|
int usb4_port_retimer_unset_inbound_sbtx(struct tb_port *port, u8 index)
|
|
{
|
|
return usb4_port_retimer_op(port, index,
|
|
USB4_SB_OPCODE_UNSET_INBOUND_SBTX, 500);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_is_last() - Is the retimer last on-board retimer
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* If the retimer at @index is last one (connected directly to the
|
|
* Type-C port) this function returns %1. If it is not returns %0. If
|
|
* the retimer is not present returns %-ENODEV. Otherwise returns
|
|
* negative errno.
|
|
*/
|
|
int usb4_port_retimer_is_last(struct tb_port *port, u8 index)
|
|
{
|
|
u32 metadata;
|
|
int ret;
|
|
|
|
ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_QUERY_LAST_RETIMER,
|
|
500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata, sizeof(metadata));
|
|
return ret ? ret : metadata & 1;
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_is_cable() - Is the retimer cable retimer
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* If the retimer at @index is last cable retimer this function returns
|
|
* %1 and %0 if it is on-board retimer. In case a retimer is not present
|
|
* at @index returns %-ENODEV. Otherwise returns negative errno.
|
|
*/
|
|
int usb4_port_retimer_is_cable(struct tb_port *port, u8 index)
|
|
{
|
|
u32 metadata;
|
|
int ret;
|
|
|
|
ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_QUERY_CABLE_RETIMER,
|
|
500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata, sizeof(metadata));
|
|
return ret ? ret : metadata & 1;
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_sector_size() - Read retimer NVM sector size
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* Reads NVM sector size (in bytes) of a retimer at @index. This
|
|
* operation can be used to determine whether the retimer supports NVM
|
|
* upgrade for example. Returns sector size in bytes or negative errno
|
|
* in case of error. Specifically returns %-ENODEV if there is no
|
|
* retimer at @index.
|
|
*/
|
|
int usb4_port_retimer_nvm_sector_size(struct tb_port *port, u8 index)
|
|
{
|
|
u32 metadata;
|
|
int ret;
|
|
|
|
ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_GET_NVM_SECTOR_SIZE,
|
|
500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata, sizeof(metadata));
|
|
return ret ? ret : metadata & USB4_NVM_SECTOR_SIZE_MASK;
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_set_offset() - Set NVM write offset
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
* @address: Start offset
|
|
*
|
|
* Exlicitly sets NVM write offset. Normally when writing to NVM this is
|
|
* done automatically by usb4_port_retimer_nvm_write().
|
|
*
|
|
* Returns %0 in success and negative errno if there was a failure.
|
|
*/
|
|
int usb4_port_retimer_nvm_set_offset(struct tb_port *port, u8 index,
|
|
unsigned int address)
|
|
{
|
|
u32 metadata, dwaddress;
|
|
int ret;
|
|
|
|
dwaddress = address / 4;
|
|
metadata = (dwaddress << USB4_NVM_SET_OFFSET_SHIFT) &
|
|
USB4_NVM_SET_OFFSET_MASK;
|
|
|
|
ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata, sizeof(metadata));
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_retimer_op(port, index, USB4_SB_OPCODE_NVM_SET_OFFSET,
|
|
500);
|
|
}
|
|
|
|
struct retimer_info {
|
|
struct tb_port *port;
|
|
u8 index;
|
|
};
|
|
|
|
static int usb4_port_retimer_nvm_write_next_block(void *data,
|
|
unsigned int dwaddress, const void *buf, size_t dwords)
|
|
|
|
{
|
|
const struct retimer_info *info = data;
|
|
struct tb_port *port = info->port;
|
|
u8 index = info->index;
|
|
int ret;
|
|
|
|
ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_DATA, buf, dwords * 4);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_retimer_op(port, index,
|
|
USB4_SB_OPCODE_NVM_BLOCK_WRITE, 1000);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_write() - Write to retimer NVM
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
* @address: Byte address where to start the write
|
|
* @buf: Data to write
|
|
* @size: Size in bytes how much to write
|
|
*
|
|
* Writes @size bytes from @buf to the retimer NVM. Used for NVM
|
|
* upgrade. Returns %0 if the data was written successfully and negative
|
|
* errno in case of failure. Specifically returns %-ENODEV if there is
|
|
* no retimer at @index.
|
|
*/
|
|
int usb4_port_retimer_nvm_write(struct tb_port *port, u8 index, unsigned int address,
|
|
const void *buf, size_t size)
|
|
{
|
|
struct retimer_info info = { .port = port, .index = index };
|
|
int ret;
|
|
|
|
ret = usb4_port_retimer_nvm_set_offset(port, index, address);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return tb_nvm_write_data(address, buf, size, USB4_DATA_RETRIES,
|
|
usb4_port_retimer_nvm_write_next_block, &info);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_authenticate() - Start retimer NVM upgrade
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
*
|
|
* After the new NVM image has been written via usb4_port_retimer_nvm_write()
|
|
* this function can be used to trigger the NVM upgrade process. If
|
|
* successful the retimer restarts with the new NVM and may not have the
|
|
* index set so one needs to call usb4_port_enumerate_retimers() to
|
|
* force index to be assigned.
|
|
*/
|
|
int usb4_port_retimer_nvm_authenticate(struct tb_port *port, u8 index)
|
|
{
|
|
u32 val;
|
|
|
|
/*
|
|
* We need to use the raw operation here because once the
|
|
* authentication completes the retimer index is not set anymore
|
|
* so we do not get back the status now.
|
|
*/
|
|
val = USB4_SB_OPCODE_NVM_AUTH_WRITE;
|
|
return usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_OPCODE, &val, sizeof(val));
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_authenticate_status() - Read status of NVM upgrade
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
* @status: Raw status code read from metadata
|
|
*
|
|
* This can be called after usb4_port_retimer_nvm_authenticate() and
|
|
* usb4_port_enumerate_retimers() to fetch status of the NVM upgrade.
|
|
*
|
|
* Returns %0 if the authentication status was successfully read. The
|
|
* completion metadata (the result) is then stored into @status. If
|
|
* reading the status fails, returns negative errno.
|
|
*/
|
|
int usb4_port_retimer_nvm_authenticate_status(struct tb_port *port, u8 index,
|
|
u32 *status)
|
|
{
|
|
u32 metadata, val;
|
|
int ret;
|
|
|
|
ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_OPCODE, &val, sizeof(val));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_sb_opcode_err_to_errno(val);
|
|
switch (ret) {
|
|
case 0:
|
|
*status = 0;
|
|
return 0;
|
|
|
|
case -EAGAIN:
|
|
ret = usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata,
|
|
sizeof(metadata));
|
|
if (ret)
|
|
return ret;
|
|
|
|
*status = metadata & USB4_SB_METADATA_NVM_AUTH_WRITE_MASK;
|
|
return 0;
|
|
|
|
default:
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
static int usb4_port_retimer_nvm_read_block(void *data, unsigned int dwaddress,
|
|
void *buf, size_t dwords)
|
|
{
|
|
const struct retimer_info *info = data;
|
|
struct tb_port *port = info->port;
|
|
u8 index = info->index;
|
|
u32 metadata;
|
|
int ret;
|
|
|
|
metadata = dwaddress << USB4_NVM_READ_OFFSET_SHIFT;
|
|
if (dwords < USB4_DATA_DWORDS)
|
|
metadata |= dwords << USB4_NVM_READ_LENGTH_SHIFT;
|
|
|
|
ret = usb4_port_sb_write(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_METADATA, &metadata, sizeof(metadata));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_port_retimer_op(port, index, USB4_SB_OPCODE_NVM_READ, 500);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_port_sb_read(port, USB4_SB_TARGET_RETIMER, index,
|
|
USB4_SB_DATA, buf, dwords * 4);
|
|
}
|
|
|
|
/**
|
|
* usb4_port_retimer_nvm_read() - Read contents of retimer NVM
|
|
* @port: USB4 port
|
|
* @index: Retimer index
|
|
* @address: NVM address (in bytes) to start reading
|
|
* @buf: Data read from NVM is stored here
|
|
* @size: Number of bytes to read
|
|
*
|
|
* Reads retimer NVM and copies the contents to @buf. Returns %0 if the
|
|
* read was successful and negative errno in case of failure.
|
|
* Specifically returns %-ENODEV if there is no retimer at @index.
|
|
*/
|
|
int usb4_port_retimer_nvm_read(struct tb_port *port, u8 index,
|
|
unsigned int address, void *buf, size_t size)
|
|
{
|
|
struct retimer_info info = { .port = port, .index = index };
|
|
|
|
return tb_nvm_read_data(address, buf, size, USB4_DATA_RETRIES,
|
|
usb4_port_retimer_nvm_read_block, &info);
|
|
}
|
|
|
|
static inline unsigned int
|
|
usb4_usb3_port_max_bandwidth(const struct tb_port *port, unsigned int bw)
|
|
{
|
|
/* Take the possible bandwidth limitation into account */
|
|
if (port->max_bw)
|
|
return min(bw, port->max_bw);
|
|
return bw;
|
|
}
|
|
|
|
/**
|
|
* usb4_usb3_port_max_link_rate() - Maximum support USB3 link rate
|
|
* @port: USB3 adapter port
|
|
*
|
|
* Return maximum supported link rate of a USB3 adapter in Mb/s.
|
|
* Negative errno in case of error.
|
|
*/
|
|
int usb4_usb3_port_max_link_rate(struct tb_port *port)
|
|
{
|
|
int ret, lr;
|
|
u32 val;
|
|
|
|
if (!tb_port_is_usb3_down(port) && !tb_port_is_usb3_up(port))
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_4, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
lr = (val & ADP_USB3_CS_4_MSLR_MASK) >> ADP_USB3_CS_4_MSLR_SHIFT;
|
|
ret = lr == ADP_USB3_CS_4_MSLR_20G ? 20000 : 10000;
|
|
|
|
return usb4_usb3_port_max_bandwidth(port, ret);
|
|
}
|
|
|
|
static int usb4_usb3_port_cm_request(struct tb_port *port, bool request)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!tb_port_is_usb3_down(port))
|
|
return -EINVAL;
|
|
if (tb_route(port->sw))
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (request)
|
|
val |= ADP_USB3_CS_2_CMR;
|
|
else
|
|
val &= ~ADP_USB3_CS_2_CMR;
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We can use val here directly as the CMR bit is in the same place
|
|
* as HCA. Just mask out others.
|
|
*/
|
|
val &= ADP_USB3_CS_2_CMR;
|
|
return usb4_port_wait_for_bit(port, port->cap_adap + ADP_USB3_CS_1,
|
|
ADP_USB3_CS_1_HCA, val, 1500,
|
|
USB4_PORT_DELAY);
|
|
}
|
|
|
|
static inline int usb4_usb3_port_set_cm_request(struct tb_port *port)
|
|
{
|
|
return usb4_usb3_port_cm_request(port, true);
|
|
}
|
|
|
|
static inline int usb4_usb3_port_clear_cm_request(struct tb_port *port)
|
|
{
|
|
return usb4_usb3_port_cm_request(port, false);
|
|
}
|
|
|
|
static unsigned int usb3_bw_to_mbps(u32 bw, u8 scale)
|
|
{
|
|
unsigned long uframes;
|
|
|
|
uframes = bw * 512UL << scale;
|
|
return DIV_ROUND_CLOSEST(uframes * 8000, MEGA);
|
|
}
|
|
|
|
static u32 mbps_to_usb3_bw(unsigned int mbps, u8 scale)
|
|
{
|
|
unsigned long uframes;
|
|
|
|
/* 1 uframe is 1/8 ms (125 us) -> 1 / 8000 s */
|
|
uframes = ((unsigned long)mbps * MEGA) / 8000;
|
|
return DIV_ROUND_UP(uframes, 512UL << scale);
|
|
}
|
|
|
|
static int usb4_usb3_port_read_allocated_bandwidth(struct tb_port *port,
|
|
int *upstream_bw,
|
|
int *downstream_bw)
|
|
{
|
|
u32 val, bw, scale;
|
|
int ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_port_read(port, &scale, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_3, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
scale &= ADP_USB3_CS_3_SCALE_MASK;
|
|
|
|
bw = val & ADP_USB3_CS_2_AUBW_MASK;
|
|
*upstream_bw = usb3_bw_to_mbps(bw, scale);
|
|
|
|
bw = (val & ADP_USB3_CS_2_ADBW_MASK) >> ADP_USB3_CS_2_ADBW_SHIFT;
|
|
*downstream_bw = usb3_bw_to_mbps(bw, scale);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_usb3_port_allocated_bandwidth() - Bandwidth allocated for USB3
|
|
* @port: USB3 adapter port
|
|
* @upstream_bw: Allocated upstream bandwidth is stored here
|
|
* @downstream_bw: Allocated downstream bandwidth is stored here
|
|
*
|
|
* Stores currently allocated USB3 bandwidth into @upstream_bw and
|
|
* @downstream_bw in Mb/s. Returns %0 in case of success and negative
|
|
* errno in failure.
|
|
*/
|
|
int usb4_usb3_port_allocated_bandwidth(struct tb_port *port, int *upstream_bw,
|
|
int *downstream_bw)
|
|
{
|
|
int ret;
|
|
|
|
ret = usb4_usb3_port_set_cm_request(port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_usb3_port_read_allocated_bandwidth(port, upstream_bw,
|
|
downstream_bw);
|
|
usb4_usb3_port_clear_cm_request(port);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int usb4_usb3_port_read_consumed_bandwidth(struct tb_port *port,
|
|
int *upstream_bw,
|
|
int *downstream_bw)
|
|
{
|
|
u32 val, bw, scale;
|
|
int ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = tb_port_read(port, &scale, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_3, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
scale &= ADP_USB3_CS_3_SCALE_MASK;
|
|
|
|
bw = val & ADP_USB3_CS_1_CUBW_MASK;
|
|
*upstream_bw = usb3_bw_to_mbps(bw, scale);
|
|
|
|
bw = (val & ADP_USB3_CS_1_CDBW_MASK) >> ADP_USB3_CS_1_CDBW_SHIFT;
|
|
*downstream_bw = usb3_bw_to_mbps(bw, scale);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int usb4_usb3_port_write_allocated_bandwidth(struct tb_port *port,
|
|
int upstream_bw,
|
|
int downstream_bw)
|
|
{
|
|
u32 val, ubw, dbw, scale;
|
|
int ret, max_bw;
|
|
|
|
/* Figure out suitable scale */
|
|
scale = 0;
|
|
max_bw = max(upstream_bw, downstream_bw);
|
|
while (scale < 64) {
|
|
if (mbps_to_usb3_bw(max_bw, scale) < 4096)
|
|
break;
|
|
scale++;
|
|
}
|
|
|
|
if (WARN_ON(scale >= 64))
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_write(port, &scale, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_3, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ubw = mbps_to_usb3_bw(upstream_bw, scale);
|
|
dbw = mbps_to_usb3_bw(downstream_bw, scale);
|
|
|
|
tb_port_dbg(port, "scaled bandwidth %u/%u, scale %u\n", ubw, dbw, scale);
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~(ADP_USB3_CS_2_AUBW_MASK | ADP_USB3_CS_2_ADBW_MASK);
|
|
val |= dbw << ADP_USB3_CS_2_ADBW_SHIFT;
|
|
val |= ubw;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_USB3_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_usb3_port_allocate_bandwidth() - Allocate bandwidth for USB3
|
|
* @port: USB3 adapter port
|
|
* @upstream_bw: New upstream bandwidth
|
|
* @downstream_bw: New downstream bandwidth
|
|
*
|
|
* This can be used to set how much bandwidth is allocated for the USB3
|
|
* tunneled isochronous traffic. @upstream_bw and @downstream_bw are the
|
|
* new values programmed to the USB3 adapter allocation registers. If
|
|
* the values are lower than what is currently consumed the allocation
|
|
* is set to what is currently consumed instead (consumed bandwidth
|
|
* cannot be taken away by CM). The actual new values are returned in
|
|
* @upstream_bw and @downstream_bw.
|
|
*
|
|
* Returns %0 in case of success and negative errno if there was a
|
|
* failure.
|
|
*/
|
|
int usb4_usb3_port_allocate_bandwidth(struct tb_port *port, int *upstream_bw,
|
|
int *downstream_bw)
|
|
{
|
|
int ret, consumed_up, consumed_down, allocate_up, allocate_down;
|
|
|
|
ret = usb4_usb3_port_set_cm_request(port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_usb3_port_read_consumed_bandwidth(port, &consumed_up,
|
|
&consumed_down);
|
|
if (ret)
|
|
goto err_request;
|
|
|
|
/* Don't allow it go lower than what is consumed */
|
|
allocate_up = max(*upstream_bw, consumed_up);
|
|
allocate_down = max(*downstream_bw, consumed_down);
|
|
|
|
ret = usb4_usb3_port_write_allocated_bandwidth(port, allocate_up,
|
|
allocate_down);
|
|
if (ret)
|
|
goto err_request;
|
|
|
|
*upstream_bw = allocate_up;
|
|
*downstream_bw = allocate_down;
|
|
|
|
err_request:
|
|
usb4_usb3_port_clear_cm_request(port);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* usb4_usb3_port_release_bandwidth() - Release allocated USB3 bandwidth
|
|
* @port: USB3 adapter port
|
|
* @upstream_bw: New allocated upstream bandwidth
|
|
* @downstream_bw: New allocated downstream bandwidth
|
|
*
|
|
* Releases USB3 allocated bandwidth down to what is actually consumed.
|
|
* The new bandwidth is returned in @upstream_bw and @downstream_bw.
|
|
*
|
|
* Returns 0% in success and negative errno in case of failure.
|
|
*/
|
|
int usb4_usb3_port_release_bandwidth(struct tb_port *port, int *upstream_bw,
|
|
int *downstream_bw)
|
|
{
|
|
int ret, consumed_up, consumed_down;
|
|
|
|
ret = usb4_usb3_port_set_cm_request(port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_usb3_port_read_consumed_bandwidth(port, &consumed_up,
|
|
&consumed_down);
|
|
if (ret)
|
|
goto err_request;
|
|
|
|
/*
|
|
* Always keep 900 Mb/s to make sure xHCI has at least some
|
|
* bandwidth available for isochronous traffic.
|
|
*/
|
|
if (consumed_up < 900)
|
|
consumed_up = 900;
|
|
if (consumed_down < 900)
|
|
consumed_down = 900;
|
|
|
|
ret = usb4_usb3_port_write_allocated_bandwidth(port, consumed_up,
|
|
consumed_down);
|
|
if (ret)
|
|
goto err_request;
|
|
|
|
*upstream_bw = consumed_up;
|
|
*downstream_bw = consumed_down;
|
|
|
|
err_request:
|
|
usb4_usb3_port_clear_cm_request(port);
|
|
return ret;
|
|
}
|
|
|
|
static bool is_usb4_dpin(const struct tb_port *port)
|
|
{
|
|
if (!tb_port_is_dpin(port))
|
|
return false;
|
|
if (!tb_switch_is_usb4(port->sw))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_cm_id() - Assign CM ID to the DP IN adapter
|
|
* @port: DP IN adapter
|
|
* @cm_id: CM ID to assign
|
|
*
|
|
* Sets CM ID for the @port. Returns %0 on success and negative errno
|
|
* otherwise. Speficially returns %-EOPNOTSUPP if the @port does not
|
|
* support this.
|
|
*/
|
|
int usb4_dp_port_set_cm_id(struct tb_port *port, int cm_id)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_CM_ID_MASK;
|
|
val |= cm_id << ADP_DP_CS_2_CM_ID_SHIFT;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_bandwidth_mode_supported() - Is the bandwidth allocation mode
|
|
* supported
|
|
* @port: DP IN adapter to check
|
|
*
|
|
* Can be called to any DP IN adapter. Returns true if the adapter
|
|
* supports USB4 bandwidth allocation mode, false otherwise.
|
|
*/
|
|
bool usb4_dp_port_bandwidth_mode_supported(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return false;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + DP_LOCAL_CAP, 1);
|
|
if (ret)
|
|
return false;
|
|
|
|
return !!(val & DP_COMMON_CAP_BW_MODE);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_bandwidth_mode_enabled() - Is the bandwidth allocation mode
|
|
* enabled
|
|
* @port: DP IN adapter to check
|
|
*
|
|
* Can be called to any DP IN adapter. Returns true if the bandwidth
|
|
* allocation mode has been enabled, false otherwise.
|
|
*/
|
|
bool usb4_dp_port_bandwidth_mode_enabled(struct tb_port *port)
|
|
{
|
|
int ret;
|
|
u32 val;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return false;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_8, 1);
|
|
if (ret)
|
|
return false;
|
|
|
|
return !!(val & ADP_DP_CS_8_DPME);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_cm_bandwidth_mode_supported() - Set/clear CM support for
|
|
* bandwidth allocation mode
|
|
* @port: DP IN adapter
|
|
* @supported: Does the CM support bandwidth allocation mode
|
|
*
|
|
* Can be called to any DP IN adapter. Sets or clears the CM support bit
|
|
* of the DP IN adapter. Returns %0 in success and negative errno
|
|
* otherwise. Specifically returns %-OPNOTSUPP if the passed in adapter
|
|
* does not support this.
|
|
*/
|
|
int usb4_dp_port_set_cm_bandwidth_mode_supported(struct tb_port *port,
|
|
bool supported)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (supported)
|
|
val |= ADP_DP_CS_2_CMMS;
|
|
else
|
|
val &= ~ADP_DP_CS_2_CMMS;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_group_id() - Return Group ID assigned for the adapter
|
|
* @port: DP IN adapter
|
|
*
|
|
* Reads bandwidth allocation Group ID from the DP IN adapter and
|
|
* returns it. If the adapter does not support setting Group_ID
|
|
* %-EOPNOTSUPP is returned.
|
|
*/
|
|
int usb4_dp_port_group_id(struct tb_port *port)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return (val & ADP_DP_CS_2_GROUP_ID_MASK) >> ADP_DP_CS_2_GROUP_ID_SHIFT;
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_group_id() - Set adapter Group ID
|
|
* @port: DP IN adapter
|
|
* @group_id: Group ID for the adapter
|
|
*
|
|
* Sets bandwidth allocation mode Group ID for the DP IN adapter.
|
|
* Returns %0 in case of success and negative errno otherwise.
|
|
* Specifically returns %-EOPNOTSUPP if the adapter does not support
|
|
* this.
|
|
*/
|
|
int usb4_dp_port_set_group_id(struct tb_port *port, int group_id)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_GROUP_ID_MASK;
|
|
val |= group_id << ADP_DP_CS_2_GROUP_ID_SHIFT;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_nrd() - Read non-reduced rate and lanes
|
|
* @port: DP IN adapter
|
|
* @rate: Non-reduced rate in Mb/s is placed here
|
|
* @lanes: Non-reduced lanes are placed here
|
|
*
|
|
* Reads the non-reduced rate and lanes from the DP IN adapter. Returns
|
|
* %0 in success and negative errno otherwise. Specifically returns
|
|
* %-EOPNOTSUPP if the adapter does not support this.
|
|
*/
|
|
int usb4_dp_port_nrd(struct tb_port *port, int *rate, int *lanes)
|
|
{
|
|
u32 val, tmp;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
tmp = (val & ADP_DP_CS_2_NRD_MLR_MASK) >> ADP_DP_CS_2_NRD_MLR_SHIFT;
|
|
switch (tmp) {
|
|
case DP_COMMON_CAP_RATE_RBR:
|
|
*rate = 1620;
|
|
break;
|
|
case DP_COMMON_CAP_RATE_HBR:
|
|
*rate = 2700;
|
|
break;
|
|
case DP_COMMON_CAP_RATE_HBR2:
|
|
*rate = 5400;
|
|
break;
|
|
case DP_COMMON_CAP_RATE_HBR3:
|
|
*rate = 8100;
|
|
break;
|
|
}
|
|
|
|
tmp = val & ADP_DP_CS_2_NRD_MLC_MASK;
|
|
switch (tmp) {
|
|
case DP_COMMON_CAP_1_LANE:
|
|
*lanes = 1;
|
|
break;
|
|
case DP_COMMON_CAP_2_LANES:
|
|
*lanes = 2;
|
|
break;
|
|
case DP_COMMON_CAP_4_LANES:
|
|
*lanes = 4;
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_nrd() - Set non-reduced rate and lanes
|
|
* @port: DP IN adapter
|
|
* @rate: Non-reduced rate in Mb/s
|
|
* @lanes: Non-reduced lanes
|
|
*
|
|
* Before the capabilities reduction this function can be used to set
|
|
* the non-reduced values for the DP IN adapter. Returns %0 in success
|
|
* and negative errno otherwise. If the adapter does not support this
|
|
* %-EOPNOTSUPP is returned.
|
|
*/
|
|
int usb4_dp_port_set_nrd(struct tb_port *port, int rate, int lanes)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_NRD_MLR_MASK;
|
|
|
|
switch (rate) {
|
|
case 1620:
|
|
break;
|
|
case 2700:
|
|
val |= (DP_COMMON_CAP_RATE_HBR << ADP_DP_CS_2_NRD_MLR_SHIFT)
|
|
& ADP_DP_CS_2_NRD_MLR_MASK;
|
|
break;
|
|
case 5400:
|
|
val |= (DP_COMMON_CAP_RATE_HBR2 << ADP_DP_CS_2_NRD_MLR_SHIFT)
|
|
& ADP_DP_CS_2_NRD_MLR_MASK;
|
|
break;
|
|
case 8100:
|
|
val |= (DP_COMMON_CAP_RATE_HBR3 << ADP_DP_CS_2_NRD_MLR_SHIFT)
|
|
& ADP_DP_CS_2_NRD_MLR_MASK;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
val &= ~ADP_DP_CS_2_NRD_MLC_MASK;
|
|
|
|
switch (lanes) {
|
|
case 1:
|
|
break;
|
|
case 2:
|
|
val |= DP_COMMON_CAP_2_LANES;
|
|
break;
|
|
case 4:
|
|
val |= DP_COMMON_CAP_4_LANES;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_granularity() - Return granularity for the bandwidth values
|
|
* @port: DP IN adapter
|
|
*
|
|
* Reads the programmed granularity from @port. If the DP IN adapter does
|
|
* not support bandwidth allocation mode returns %-EOPNOTSUPP and negative
|
|
* errno in other error cases.
|
|
*/
|
|
int usb4_dp_port_granularity(struct tb_port *port)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ADP_DP_CS_2_GR_MASK;
|
|
val >>= ADP_DP_CS_2_GR_SHIFT;
|
|
|
|
switch (val) {
|
|
case ADP_DP_CS_2_GR_0_25G:
|
|
return 250;
|
|
case ADP_DP_CS_2_GR_0_5G:
|
|
return 500;
|
|
case ADP_DP_CS_2_GR_1G:
|
|
return 1000;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_granularity() - Set granularity for the bandwidth values
|
|
* @port: DP IN adapter
|
|
* @granularity: Granularity in Mb/s. Supported values: 1000, 500 and 250.
|
|
*
|
|
* Sets the granularity used with the estimated, allocated and requested
|
|
* bandwidth. Returns %0 in success and negative errno otherwise. If the
|
|
* adapter does not support this %-EOPNOTSUPP is returned.
|
|
*/
|
|
int usb4_dp_port_set_granularity(struct tb_port *port, int granularity)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_GR_MASK;
|
|
|
|
switch (granularity) {
|
|
case 250:
|
|
val |= ADP_DP_CS_2_GR_0_25G << ADP_DP_CS_2_GR_SHIFT;
|
|
break;
|
|
case 500:
|
|
val |= ADP_DP_CS_2_GR_0_5G << ADP_DP_CS_2_GR_SHIFT;
|
|
break;
|
|
case 1000:
|
|
val |= ADP_DP_CS_2_GR_1G << ADP_DP_CS_2_GR_SHIFT;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_set_estimated_bandwidth() - Set estimated bandwidth
|
|
* @port: DP IN adapter
|
|
* @bw: Estimated bandwidth in Mb/s.
|
|
*
|
|
* Sets the estimated bandwidth to @bw. Set the granularity by calling
|
|
* usb4_dp_port_set_granularity() before calling this. The @bw is round
|
|
* down to the closest granularity multiplier. Returns %0 in success
|
|
* and negative errno otherwise. Specifically returns %-EOPNOTSUPP if
|
|
* the adapter does not support this.
|
|
*/
|
|
int usb4_dp_port_set_estimated_bandwidth(struct tb_port *port, int bw)
|
|
{
|
|
u32 val, granularity;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = usb4_dp_port_granularity(port);
|
|
if (ret < 0)
|
|
return ret;
|
|
granularity = ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_ESTIMATED_BW_MASK;
|
|
val |= (bw / granularity) << ADP_DP_CS_2_ESTIMATED_BW_SHIFT;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_allocated_bandwidth() - Return allocated bandwidth
|
|
* @port: DP IN adapter
|
|
*
|
|
* Reads and returns allocated bandwidth for @port in Mb/s (taking into
|
|
* account the programmed granularity). Returns negative errno in case
|
|
* of error.
|
|
*/
|
|
int usb4_dp_port_allocated_bandwidth(struct tb_port *port)
|
|
{
|
|
u32 val, granularity;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = usb4_dp_port_granularity(port);
|
|
if (ret < 0)
|
|
return ret;
|
|
granularity = ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + DP_STATUS, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= DP_STATUS_ALLOCATED_BW_MASK;
|
|
val >>= DP_STATUS_ALLOCATED_BW_SHIFT;
|
|
|
|
return val * granularity;
|
|
}
|
|
|
|
static int __usb4_dp_port_set_cm_ack(struct tb_port *port, bool ack)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (ack)
|
|
val |= ADP_DP_CS_2_CA;
|
|
else
|
|
val &= ~ADP_DP_CS_2_CA;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
static inline int usb4_dp_port_set_cm_ack(struct tb_port *port)
|
|
{
|
|
return __usb4_dp_port_set_cm_ack(port, true);
|
|
}
|
|
|
|
static int usb4_dp_port_wait_and_clear_cm_ack(struct tb_port *port,
|
|
int timeout_msec)
|
|
{
|
|
ktime_t end;
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = __usb4_dp_port_set_cm_ack(port, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
end = ktime_add_ms(ktime_get(), timeout_msec);
|
|
do {
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_8, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!(val & ADP_DP_CS_8_DR))
|
|
break;
|
|
|
|
usleep_range(50, 100);
|
|
} while (ktime_before(ktime_get(), end));
|
|
|
|
if (val & ADP_DP_CS_8_DR) {
|
|
tb_port_warn(port, "timeout waiting for DPTX request to clear\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~ADP_DP_CS_2_CA;
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_2, 1);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_allocate_bandwidth() - Set allocated bandwidth
|
|
* @port: DP IN adapter
|
|
* @bw: New allocated bandwidth in Mb/s
|
|
*
|
|
* Communicates the new allocated bandwidth with the DPCD (graphics
|
|
* driver). Takes into account the programmed granularity. Returns %0 in
|
|
* success and negative errno in case of error.
|
|
*/
|
|
int usb4_dp_port_allocate_bandwidth(struct tb_port *port, int bw)
|
|
{
|
|
u32 val, granularity;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = usb4_dp_port_granularity(port);
|
|
if (ret < 0)
|
|
return ret;
|
|
granularity = ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + DP_STATUS, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val &= ~DP_STATUS_ALLOCATED_BW_MASK;
|
|
val |= (bw / granularity) << DP_STATUS_ALLOCATED_BW_SHIFT;
|
|
|
|
ret = tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + DP_STATUS, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = usb4_dp_port_set_cm_ack(port);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return usb4_dp_port_wait_and_clear_cm_ack(port, 500);
|
|
}
|
|
|
|
/**
|
|
* usb4_dp_port_requested_bandwidth() - Read requested bandwidth
|
|
* @port: DP IN adapter
|
|
*
|
|
* Reads the DPCD (graphics driver) requested bandwidth and returns it
|
|
* in Mb/s. Takes the programmed granularity into account. In case of
|
|
* error returns negative errno. Specifically returns %-EOPNOTSUPP if
|
|
* the adapter does not support bandwidth allocation mode, and %ENODATA
|
|
* if there is no active bandwidth request from the graphics driver.
|
|
*/
|
|
int usb4_dp_port_requested_bandwidth(struct tb_port *port)
|
|
{
|
|
u32 val, granularity;
|
|
int ret;
|
|
|
|
if (!is_usb4_dpin(port))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = usb4_dp_port_granularity(port);
|
|
if (ret < 0)
|
|
return ret;
|
|
granularity = ret;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_DP_CS_8, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!(val & ADP_DP_CS_8_DR))
|
|
return -ENODATA;
|
|
|
|
return (val & ADP_DP_CS_8_REQUESTED_BW_MASK) * granularity;
|
|
}
|
|
|
|
/**
|
|
* usb4_pci_port_set_ext_encapsulation() - Enable/disable extended encapsulation
|
|
* @port: PCIe adapter
|
|
* @enable: Enable/disable extended encapsulation
|
|
*
|
|
* Enables or disables extended encapsulation used in PCIe tunneling. Caller
|
|
* needs to make sure both adapters support this before enabling. Returns %0 on
|
|
* success and negative errno otherwise.
|
|
*/
|
|
int usb4_pci_port_set_ext_encapsulation(struct tb_port *port, bool enable)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
if (!tb_port_is_pcie_up(port) && !tb_port_is_pcie_down(port))
|
|
return -EINVAL;
|
|
|
|
ret = tb_port_read(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_PCIE_CS_1, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (enable)
|
|
val |= ADP_PCIE_CS_1_EE;
|
|
else
|
|
val &= ~ADP_PCIE_CS_1_EE;
|
|
|
|
return tb_port_write(port, &val, TB_CFG_PORT,
|
|
port->cap_adap + ADP_PCIE_CS_1, 1);
|
|
}
|