467 lines
11 KiB
C
467 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Applied Micro X-Gene SoC MDIO Driver
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*
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* Copyright (c) 2016, Applied Micro Circuits Corporation
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* Author: Iyappan Subramanian <isubramanian@apm.com>
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*/
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#include <linux/acpi.h>
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/efi.h>
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#include <linux/if_vlan.h>
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#include <linux/io.h>
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#include <linux/mdio/mdio-xgene.h>
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#include <linux/module.h>
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#include <linux/of_mdio.h>
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#include <linux/of_net.h>
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#include <linux/of_platform.h>
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#include <linux/phy.h>
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#include <linux/prefetch.h>
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#include <net/ip.h>
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static bool xgene_mdio_status;
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u32 xgene_mdio_rd_mac(struct xgene_mdio_pdata *pdata, u32 rd_addr)
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{
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void __iomem *addr, *rd, *cmd, *cmd_done;
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u32 done, rd_data = BUSY_MASK;
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u8 wait = 10;
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addr = pdata->mac_csr_addr + MAC_ADDR_REG_OFFSET;
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rd = pdata->mac_csr_addr + MAC_READ_REG_OFFSET;
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cmd = pdata->mac_csr_addr + MAC_COMMAND_REG_OFFSET;
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cmd_done = pdata->mac_csr_addr + MAC_COMMAND_DONE_REG_OFFSET;
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spin_lock(&pdata->mac_lock);
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iowrite32(rd_addr, addr);
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iowrite32(XGENE_ENET_RD_CMD, cmd);
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while (!(done = ioread32(cmd_done)) && wait--)
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udelay(1);
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if (done)
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rd_data = ioread32(rd);
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iowrite32(0, cmd);
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spin_unlock(&pdata->mac_lock);
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return rd_data;
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}
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EXPORT_SYMBOL(xgene_mdio_rd_mac);
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void xgene_mdio_wr_mac(struct xgene_mdio_pdata *pdata, u32 wr_addr, u32 data)
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{
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void __iomem *addr, *wr, *cmd, *cmd_done;
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u8 wait = 10;
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u32 done;
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addr = pdata->mac_csr_addr + MAC_ADDR_REG_OFFSET;
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wr = pdata->mac_csr_addr + MAC_WRITE_REG_OFFSET;
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cmd = pdata->mac_csr_addr + MAC_COMMAND_REG_OFFSET;
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cmd_done = pdata->mac_csr_addr + MAC_COMMAND_DONE_REG_OFFSET;
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spin_lock(&pdata->mac_lock);
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iowrite32(wr_addr, addr);
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iowrite32(data, wr);
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iowrite32(XGENE_ENET_WR_CMD, cmd);
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while (!(done = ioread32(cmd_done)) && wait--)
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udelay(1);
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if (!done)
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pr_err("MCX mac write failed, addr: 0x%04x\n", wr_addr);
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iowrite32(0, cmd);
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spin_unlock(&pdata->mac_lock);
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}
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EXPORT_SYMBOL(xgene_mdio_wr_mac);
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int xgene_mdio_rgmii_read(struct mii_bus *bus, int phy_id, int reg)
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{
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struct xgene_mdio_pdata *pdata = (struct xgene_mdio_pdata *)bus->priv;
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u32 data, done;
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u8 wait = 10;
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data = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
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xgene_mdio_wr_mac(pdata, MII_MGMT_ADDRESS_ADDR, data);
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xgene_mdio_wr_mac(pdata, MII_MGMT_COMMAND_ADDR, READ_CYCLE_MASK);
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do {
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usleep_range(5, 10);
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done = xgene_mdio_rd_mac(pdata, MII_MGMT_INDICATORS_ADDR);
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} while ((done & BUSY_MASK) && wait--);
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if (done & BUSY_MASK) {
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dev_err(&bus->dev, "MII_MGMT read failed\n");
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return -EBUSY;
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}
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data = xgene_mdio_rd_mac(pdata, MII_MGMT_STATUS_ADDR);
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xgene_mdio_wr_mac(pdata, MII_MGMT_COMMAND_ADDR, 0);
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return data;
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}
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EXPORT_SYMBOL(xgene_mdio_rgmii_read);
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int xgene_mdio_rgmii_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
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{
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struct xgene_mdio_pdata *pdata = (struct xgene_mdio_pdata *)bus->priv;
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u32 val, done;
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u8 wait = 10;
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val = SET_VAL(PHY_ADDR, phy_id) | SET_VAL(REG_ADDR, reg);
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xgene_mdio_wr_mac(pdata, MII_MGMT_ADDRESS_ADDR, val);
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xgene_mdio_wr_mac(pdata, MII_MGMT_CONTROL_ADDR, data);
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do {
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usleep_range(5, 10);
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done = xgene_mdio_rd_mac(pdata, MII_MGMT_INDICATORS_ADDR);
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} while ((done & BUSY_MASK) && wait--);
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if (done & BUSY_MASK) {
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dev_err(&bus->dev, "MII_MGMT write failed\n");
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return -EBUSY;
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}
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return 0;
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}
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EXPORT_SYMBOL(xgene_mdio_rgmii_write);
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static u32 xgene_menet_rd_diag_csr(struct xgene_mdio_pdata *pdata, u32 offset)
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{
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return ioread32(pdata->diag_csr_addr + offset);
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}
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static void xgene_menet_wr_diag_csr(struct xgene_mdio_pdata *pdata,
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u32 offset, u32 val)
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{
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iowrite32(val, pdata->diag_csr_addr + offset);
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}
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static int xgene_enet_ecc_init(struct xgene_mdio_pdata *pdata)
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{
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u32 data;
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u8 wait = 10;
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xgene_menet_wr_diag_csr(pdata, MENET_CFG_MEM_RAM_SHUTDOWN_ADDR, 0x0);
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do {
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usleep_range(100, 110);
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data = xgene_menet_rd_diag_csr(pdata, MENET_BLOCK_MEM_RDY_ADDR);
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} while ((data != 0xffffffff) && wait--);
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if (data != 0xffffffff) {
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dev_err(pdata->dev, "Failed to release memory from shutdown\n");
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return -ENODEV;
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}
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return 0;
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}
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static void xgene_gmac_reset(struct xgene_mdio_pdata *pdata)
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{
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xgene_mdio_wr_mac(pdata, MAC_CONFIG_1_ADDR, SOFT_RESET);
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xgene_mdio_wr_mac(pdata, MAC_CONFIG_1_ADDR, 0);
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}
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static int xgene_mdio_reset(struct xgene_mdio_pdata *pdata)
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{
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int ret;
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if (pdata->dev->of_node) {
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clk_prepare_enable(pdata->clk);
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udelay(5);
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clk_disable_unprepare(pdata->clk);
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udelay(5);
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clk_prepare_enable(pdata->clk);
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udelay(5);
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} else {
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#ifdef CONFIG_ACPI
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acpi_evaluate_object(ACPI_HANDLE(pdata->dev),
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"_RST", NULL, NULL);
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#endif
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}
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ret = xgene_enet_ecc_init(pdata);
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if (ret) {
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if (pdata->dev->of_node)
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clk_disable_unprepare(pdata->clk);
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return ret;
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}
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xgene_gmac_reset(pdata);
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return 0;
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}
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static void xgene_enet_rd_mdio_csr(void __iomem *base_addr,
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u32 offset, u32 *val)
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{
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void __iomem *addr = base_addr + offset;
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*val = ioread32(addr);
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}
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static void xgene_enet_wr_mdio_csr(void __iomem *base_addr,
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u32 offset, u32 val)
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{
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void __iomem *addr = base_addr + offset;
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iowrite32(val, addr);
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}
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static int xgene_xfi_mdio_write(struct mii_bus *bus, int phy_id,
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int reg, u16 data)
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{
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void __iomem *addr = (void __iomem *)bus->priv;
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int timeout = 100;
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u32 status, val;
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val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg) |
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SET_VAL(HSTMIIMWRDAT, data);
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xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, val);
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val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_WRITE);
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xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
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do {
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usleep_range(5, 10);
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xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
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} while ((status & BUSY_MASK) && timeout--);
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xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
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return 0;
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}
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static int xgene_xfi_mdio_read(struct mii_bus *bus, int phy_id, int reg)
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{
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void __iomem *addr = (void __iomem *)bus->priv;
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u32 data, status, val;
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int timeout = 100;
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val = SET_VAL(HSTPHYADX, phy_id) | SET_VAL(HSTREGADX, reg);
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xgene_enet_wr_mdio_csr(addr, MIIM_FIELD_ADDR, val);
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val = HSTLDCMD | SET_VAL(HSTMIIMCMD, MIIM_CMD_LEGACY_READ);
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xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, val);
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do {
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usleep_range(5, 10);
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xgene_enet_rd_mdio_csr(addr, MIIM_INDICATOR_ADDR, &status);
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} while ((status & BUSY_MASK) && timeout--);
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if (status & BUSY_MASK) {
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pr_err("XGENET_MII_MGMT write failed\n");
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return -EBUSY;
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}
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xgene_enet_rd_mdio_csr(addr, MIIMRD_FIELD_ADDR, &data);
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xgene_enet_wr_mdio_csr(addr, MIIM_COMMAND_ADDR, 0);
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return data;
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}
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struct phy_device *xgene_enet_phy_register(struct mii_bus *bus, int phy_addr)
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{
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struct phy_device *phy_dev;
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phy_dev = get_phy_device(bus, phy_addr, false);
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if (!phy_dev || IS_ERR(phy_dev))
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return NULL;
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if (phy_device_register(phy_dev))
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phy_device_free(phy_dev);
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return phy_dev;
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}
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EXPORT_SYMBOL(xgene_enet_phy_register);
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#ifdef CONFIG_ACPI
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static acpi_status acpi_register_phy(acpi_handle handle, u32 lvl,
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void *context, void **ret)
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{
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struct mii_bus *mdio = context;
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struct acpi_device *adev;
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struct phy_device *phy_dev;
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const union acpi_object *obj;
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u32 phy_addr;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (acpi_dev_get_property(adev, "phy-channel", ACPI_TYPE_INTEGER, &obj))
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return AE_OK;
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phy_addr = obj->integer.value;
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phy_dev = xgene_enet_phy_register(mdio, phy_addr);
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adev->driver_data = phy_dev;
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return AE_OK;
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}
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#endif
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static const struct of_device_id xgene_mdio_of_match[] = {
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{
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.compatible = "apm,xgene-mdio-rgmii",
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.data = (void *)XGENE_MDIO_RGMII
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},
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{
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.compatible = "apm,xgene-mdio-xfi",
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.data = (void *)XGENE_MDIO_XFI
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, xgene_mdio_of_match);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id xgene_mdio_acpi_match[] = {
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{ "APMC0D65", XGENE_MDIO_RGMII },
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{ "APMC0D66", XGENE_MDIO_XFI },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, xgene_mdio_acpi_match);
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#endif
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static int xgene_mdio_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mii_bus *mdio_bus;
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const struct of_device_id *of_id;
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struct xgene_mdio_pdata *pdata;
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void __iomem *csr_base;
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int mdio_id = 0, ret = 0;
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of_id = of_match_device(xgene_mdio_of_match, &pdev->dev);
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if (of_id) {
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mdio_id = (enum xgene_mdio_id)of_id->data;
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} else {
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#ifdef CONFIG_ACPI
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const struct acpi_device_id *acpi_id;
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acpi_id = acpi_match_device(xgene_mdio_acpi_match, &pdev->dev);
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if (acpi_id)
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mdio_id = (enum xgene_mdio_id)acpi_id->driver_data;
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#endif
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}
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if (!mdio_id)
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return -ENODEV;
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pdata = devm_kzalloc(dev, sizeof(struct xgene_mdio_pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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pdata->mdio_id = mdio_id;
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pdata->dev = dev;
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csr_base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(csr_base))
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return PTR_ERR(csr_base);
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pdata->mac_csr_addr = csr_base;
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pdata->mdio_csr_addr = csr_base + BLOCK_XG_MDIO_CSR_OFFSET;
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pdata->diag_csr_addr = csr_base + BLOCK_DIAG_CSR_OFFSET;
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if (mdio_id == XGENE_MDIO_RGMII)
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spin_lock_init(&pdata->mac_lock);
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if (dev->of_node) {
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pdata->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(pdata->clk)) {
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dev_err(dev, "Unable to retrieve clk\n");
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return PTR_ERR(pdata->clk);
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}
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}
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ret = xgene_mdio_reset(pdata);
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if (ret)
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return ret;
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mdio_bus = mdiobus_alloc();
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if (!mdio_bus) {
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ret = -ENOMEM;
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goto out_clk;
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}
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mdio_bus->name = "APM X-Gene MDIO bus";
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if (mdio_id == XGENE_MDIO_RGMII) {
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mdio_bus->read = xgene_mdio_rgmii_read;
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mdio_bus->write = xgene_mdio_rgmii_write;
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mdio_bus->priv = (void __force *)pdata;
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snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
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"xgene-mii-rgmii");
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} else {
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mdio_bus->read = xgene_xfi_mdio_read;
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mdio_bus->write = xgene_xfi_mdio_write;
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mdio_bus->priv = (void __force *)pdata->mdio_csr_addr;
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snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s",
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"xgene-mii-xfi");
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}
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mdio_bus->parent = dev;
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platform_set_drvdata(pdev, pdata);
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if (dev->of_node) {
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ret = of_mdiobus_register(mdio_bus, dev->of_node);
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} else {
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#ifdef CONFIG_ACPI
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/* Mask out all PHYs from auto probing. */
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mdio_bus->phy_mask = ~0;
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ret = mdiobus_register(mdio_bus);
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if (ret)
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goto out_mdiobus;
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acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_HANDLE(dev), 1,
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acpi_register_phy, NULL, mdio_bus, NULL);
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#endif
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}
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if (ret)
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goto out_mdiobus;
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pdata->mdio_bus = mdio_bus;
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xgene_mdio_status = true;
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return 0;
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out_mdiobus:
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mdiobus_free(mdio_bus);
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out_clk:
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if (dev->of_node)
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clk_disable_unprepare(pdata->clk);
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return ret;
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}
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static int xgene_mdio_remove(struct platform_device *pdev)
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{
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struct xgene_mdio_pdata *pdata = platform_get_drvdata(pdev);
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struct mii_bus *mdio_bus = pdata->mdio_bus;
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struct device *dev = &pdev->dev;
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mdiobus_unregister(mdio_bus);
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mdiobus_free(mdio_bus);
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if (dev->of_node)
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clk_disable_unprepare(pdata->clk);
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return 0;
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}
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static struct platform_driver xgene_mdio_driver = {
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.driver = {
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.name = "xgene-mdio",
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.of_match_table = of_match_ptr(xgene_mdio_of_match),
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.acpi_match_table = ACPI_PTR(xgene_mdio_acpi_match),
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},
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.probe = xgene_mdio_probe,
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.remove = xgene_mdio_remove,
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};
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module_platform_driver(xgene_mdio_driver);
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MODULE_DESCRIPTION("APM X-Gene SoC MDIO driver");
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MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
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MODULE_LICENSE("GPL");
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