282 lines
6.8 KiB
C
282 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020, Broadcom */
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/iopoll.h>
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#include "ehci.h"
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#define hcd_to_ehci_priv(h) ((struct brcm_priv *)hcd_to_ehci(h)->priv)
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struct brcm_priv {
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struct clk *clk;
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};
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/*
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* ehci_brcm_wait_for_sof
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* Wait for start of next microframe, then wait extra delay microseconds
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*/
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static inline void ehci_brcm_wait_for_sof(struct ehci_hcd *ehci, u32 delay)
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{
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u32 frame_idx = ehci_readl(ehci, &ehci->regs->frame_index);
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u32 val;
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int res;
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/* Wait for next microframe (every 125 usecs) */
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res = readl_relaxed_poll_timeout(&ehci->regs->frame_index, val,
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val != frame_idx, 1, 130);
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if (res)
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ehci_err(ehci, "Error waiting for SOF\n");
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udelay(delay);
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}
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/*
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* ehci_brcm_hub_control
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* The EHCI controller has a bug where it can violate the SOF
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* interval between the first two SOF's transmitted after resume
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* if the resume occurs near the end of the microframe. This causees
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* the controller to detect babble on the suspended port and
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* will eventually cause the controller to reset the port.
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* The fix is to Intercept the echi-hcd request to complete RESUME and
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* align it to the start of the next microframe.
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* See SWLINUX-1909 for more details
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*/
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static int ehci_brcm_hub_control(
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struct usb_hcd *hcd,
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u16 typeReq,
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u16 wValue,
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u16 wIndex,
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char *buf,
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u16 wLength)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int ports = HCS_N_PORTS(ehci->hcs_params);
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u32 __iomem *status_reg;
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unsigned long flags;
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int retval, irq_disabled = 0;
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u32 temp;
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temp = (wIndex & 0xff) - 1;
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if (temp >= HCS_N_PORTS_MAX) /* Avoid index-out-of-bounds warning */
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temp = 0;
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status_reg = &ehci->regs->port_status[temp];
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/*
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* RESUME is cleared when GetPortStatus() is called 20ms after start
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* of RESUME
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*/
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if ((typeReq == GetPortStatus) &&
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(wIndex && wIndex <= ports) &&
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ehci->reset_done[wIndex-1] &&
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time_after_eq(jiffies, ehci->reset_done[wIndex-1]) &&
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(ehci_readl(ehci, status_reg) & PORT_RESUME)) {
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/*
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* to make sure we are not interrupted until RESUME bit
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* is cleared, disable interrupts on current CPU
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*/
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ehci_dbg(ehci, "SOF alignment workaround\n");
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irq_disabled = 1;
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local_irq_save(flags);
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ehci_brcm_wait_for_sof(ehci, 5);
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}
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retval = ehci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
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if (irq_disabled)
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local_irq_restore(flags);
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return retval;
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}
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static int ehci_brcm_reset(struct usb_hcd *hcd)
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{
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int len;
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ehci->big_endian_mmio = 1;
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ehci->caps = (void __iomem *)hcd->regs;
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len = HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
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ehci->regs = (void __iomem *)(hcd->regs + len);
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/* This fixes the lockup during reboot due to prior interrupts */
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ehci_writel(ehci, CMD_RESET, &ehci->regs->command);
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mdelay(10);
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/*
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* SWLINUX-1705: Avoid OUT packet underflows during high memory
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* bus usage
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*/
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ehci_writel(ehci, 0x00800040, &ehci->regs->brcm_insnreg[1]);
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ehci_writel(ehci, 0x00000001, &ehci->regs->brcm_insnreg[3]);
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return ehci_setup(hcd);
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}
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static struct hc_driver __read_mostly ehci_brcm_hc_driver;
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static const struct ehci_driver_overrides brcm_overrides __initconst = {
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.reset = ehci_brcm_reset,
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.extra_priv_size = sizeof(struct brcm_priv),
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};
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static int ehci_brcm_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *res_mem;
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struct brcm_priv *priv;
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struct usb_hcd *hcd;
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int irq;
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int err;
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err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (err)
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return err;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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/* Hook the hub control routine to work around a bug */
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ehci_brcm_hc_driver.hub_control = ehci_brcm_hub_control;
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/* initialize hcd */
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hcd = usb_create_hcd(&ehci_brcm_hc_driver, dev, dev_name(dev));
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if (!hcd)
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return -ENOMEM;
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platform_set_drvdata(pdev, hcd);
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priv = hcd_to_ehci_priv(hcd);
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priv->clk = devm_clk_get_optional(dev, NULL);
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if (IS_ERR(priv->clk)) {
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err = PTR_ERR(priv->clk);
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goto err_hcd;
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}
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err = clk_prepare_enable(priv->clk);
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if (err)
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goto err_hcd;
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hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res_mem);
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if (IS_ERR(hcd->regs)) {
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err = PTR_ERR(hcd->regs);
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goto err_clk;
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}
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hcd->rsrc_start = res_mem->start;
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hcd->rsrc_len = resource_size(res_mem);
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err)
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goto err_clk;
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device_wakeup_enable(hcd->self.controller);
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device_enable_async_suspend(hcd->self.controller);
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return 0;
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err_clk:
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clk_disable_unprepare(priv->clk);
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err_hcd:
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usb_put_hcd(hcd);
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return err;
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}
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static int ehci_brcm_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct brcm_priv *priv = hcd_to_ehci_priv(hcd);
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usb_remove_hcd(hcd);
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clk_disable_unprepare(priv->clk);
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usb_put_hcd(hcd);
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return 0;
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}
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static int __maybe_unused ehci_brcm_suspend(struct device *dev)
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{
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int ret;
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct brcm_priv *priv = hcd_to_ehci_priv(hcd);
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bool do_wakeup = device_may_wakeup(dev);
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ret = ehci_suspend(hcd, do_wakeup);
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if (ret)
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return ret;
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clk_disable_unprepare(priv->clk);
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return 0;
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}
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static int __maybe_unused ehci_brcm_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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struct brcm_priv *priv = hcd_to_ehci_priv(hcd);
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int err;
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err = clk_prepare_enable(priv->clk);
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if (err)
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return err;
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/*
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* SWLINUX-1705: Avoid OUT packet underflows during high memory
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* bus usage
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*/
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ehci_writel(ehci, 0x00800040, &ehci->regs->brcm_insnreg[1]);
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ehci_writel(ehci, 0x00000001, &ehci->regs->brcm_insnreg[3]);
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ehci_resume(hcd, false);
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(ehci_brcm_pm_ops, ehci_brcm_suspend,
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ehci_brcm_resume);
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static const struct of_device_id brcm_ehci_of_match[] = {
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{ .compatible = "brcm,ehci-brcm-v2", },
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{ .compatible = "brcm,bcm7445-ehci", },
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{}
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};
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static struct platform_driver ehci_brcm_driver = {
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.probe = ehci_brcm_probe,
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.remove = ehci_brcm_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "ehci-brcm",
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.pm = &ehci_brcm_pm_ops,
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.of_match_table = brcm_ehci_of_match,
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}
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};
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static int __init ehci_brcm_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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ehci_init_driver(&ehci_brcm_hc_driver, &brcm_overrides);
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return platform_driver_register(&ehci_brcm_driver);
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}
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module_init(ehci_brcm_init);
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static void __exit ehci_brcm_exit(void)
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{
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platform_driver_unregister(&ehci_brcm_driver);
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}
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module_exit(ehci_brcm_exit);
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MODULE_ALIAS("platform:ehci-brcm");
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MODULE_DESCRIPTION("EHCI Broadcom STB driver");
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MODULE_AUTHOR("Al Cooper");
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MODULE_LICENSE("GPL");
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