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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f5ee3f2b5a
On the STiH410 B2120 development board the ST EHCI IP shares its reset line with the OHCI IP. New functionality in the reset subsystems forces consumers to be explicit when requesting shared/exclusive reset lines. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Lee Jones <lee.jones@linaro.org>
350 lines
7.7 KiB
C
350 lines
7.7 KiB
C
/*
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* ST OHCI driver
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*
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* Copyright (C) 2014 STMicroelectronics – All Rights Reserved
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*
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* Author: Peter Griffin <peter.griffin@linaro.org>
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*
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* Derived from ohci-platform.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/hrtimer.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/phy/phy.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/usb/ohci_pdriver.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include "ohci.h"
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#define USB_MAX_CLKS 3
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struct st_ohci_platform_priv {
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struct clk *clks[USB_MAX_CLKS];
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struct clk *clk48;
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struct reset_control *rst;
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struct reset_control *pwr;
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struct phy *phy;
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};
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#define DRIVER_DESC "OHCI STMicroelectronics driver"
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#define hcd_to_ohci_priv(h) \
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((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv)
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static const char hcd_name[] = "ohci-st";
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static int st_ohci_platform_power_on(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 st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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int clk, ret;
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ret = reset_control_deassert(priv->pwr);
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if (ret)
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return ret;
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ret = reset_control_deassert(priv->rst);
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if (ret)
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goto err_assert_power;
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/* some SoCs don't have a dedicated 48Mhz clock, but those that do
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need the rate to be explicitly set */
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if (priv->clk48) {
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ret = clk_set_rate(priv->clk48, 48000000);
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if (ret)
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goto err_assert_reset;
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}
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for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
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ret = clk_prepare_enable(priv->clks[clk]);
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if (ret)
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goto err_disable_clks;
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}
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ret = phy_init(priv->phy);
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if (ret)
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goto err_disable_clks;
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ret = phy_power_on(priv->phy);
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if (ret)
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goto err_exit_phy;
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return 0;
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err_exit_phy:
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phy_exit(priv->phy);
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err_disable_clks:
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while (--clk >= 0)
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clk_disable_unprepare(priv->clks[clk]);
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err_assert_reset:
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reset_control_assert(priv->rst);
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err_assert_power:
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reset_control_assert(priv->pwr);
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return ret;
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}
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static void st_ohci_platform_power_off(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 st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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int clk;
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reset_control_assert(priv->pwr);
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reset_control_assert(priv->rst);
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phy_power_off(priv->phy);
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phy_exit(priv->phy);
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for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
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if (priv->clks[clk])
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clk_disable_unprepare(priv->clks[clk]);
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}
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static struct hc_driver __read_mostly ohci_platform_hc_driver;
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static const struct ohci_driver_overrides platform_overrides __initconst = {
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.product_desc = "ST OHCI controller",
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.extra_priv_size = sizeof(struct st_ohci_platform_priv),
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};
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static struct usb_ohci_pdata ohci_platform_defaults = {
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.power_on = st_ohci_platform_power_on,
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.power_suspend = st_ohci_platform_power_off,
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.power_off = st_ohci_platform_power_off,
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};
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static int st_ohci_platform_probe(struct platform_device *dev)
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{
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struct usb_hcd *hcd;
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struct resource *res_mem;
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struct usb_ohci_pdata *pdata = &ohci_platform_defaults;
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struct st_ohci_platform_priv *priv;
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struct ohci_hcd *ohci;
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int err, irq, clk = 0;
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if (usb_disabled())
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return -ENODEV;
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irq = platform_get_irq(dev, 0);
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if (irq < 0) {
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dev_err(&dev->dev, "no irq provided");
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return irq;
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}
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res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res_mem) {
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dev_err(&dev->dev, "no memory resource provided");
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return -ENXIO;
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}
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hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
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dev_name(&dev->dev));
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if (!hcd)
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return -ENOMEM;
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platform_set_drvdata(dev, hcd);
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dev->dev.platform_data = pdata;
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priv = hcd_to_ohci_priv(hcd);
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ohci = hcd_to_ohci(hcd);
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priv->phy = devm_phy_get(&dev->dev, "usb");
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if (IS_ERR(priv->phy)) {
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err = PTR_ERR(priv->phy);
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goto err_put_hcd;
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}
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for (clk = 0; clk < USB_MAX_CLKS; clk++) {
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priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
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if (IS_ERR(priv->clks[clk])) {
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err = PTR_ERR(priv->clks[clk]);
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if (err == -EPROBE_DEFER)
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goto err_put_clks;
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priv->clks[clk] = NULL;
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break;
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}
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}
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/* some SoCs don't have a dedicated 48Mhz clock, but those that
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do need the rate to be explicitly set */
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priv->clk48 = devm_clk_get(&dev->dev, "clk48");
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if (IS_ERR(priv->clk48)) {
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dev_info(&dev->dev, "48MHz clk not found\n");
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priv->clk48 = NULL;
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}
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priv->pwr =
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devm_reset_control_get_optional_shared(&dev->dev, "power");
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if (IS_ERR(priv->pwr)) {
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err = PTR_ERR(priv->pwr);
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goto err_put_clks;
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}
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priv->rst =
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devm_reset_control_get_optional_shared(&dev->dev, "softreset");
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if (IS_ERR(priv->rst)) {
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err = PTR_ERR(priv->rst);
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goto err_put_clks;
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}
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if (pdata->power_on) {
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err = pdata->power_on(dev);
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if (err < 0)
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goto err_power;
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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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hcd->regs = devm_ioremap_resource(&dev->dev, 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_power;
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}
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err)
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goto err_power;
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device_wakeup_enable(hcd->self.controller);
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platform_set_drvdata(dev, hcd);
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return err;
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err_power:
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if (pdata->power_off)
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pdata->power_off(dev);
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err_put_clks:
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while (--clk >= 0)
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clk_put(priv->clks[clk]);
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err_put_hcd:
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if (pdata == &ohci_platform_defaults)
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dev->dev.platform_data = NULL;
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usb_put_hcd(hcd);
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return err;
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}
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static int st_ohci_platform_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 usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
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struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
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int clk;
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usb_remove_hcd(hcd);
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if (pdata->power_off)
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pdata->power_off(dev);
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for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
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clk_put(priv->clks[clk]);
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usb_put_hcd(hcd);
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if (pdata == &ohci_platform_defaults)
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dev->dev.platform_data = NULL;
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int st_ohci_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct usb_ohci_pdata *pdata = dev->platform_data;
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struct platform_device *pdev = to_platform_device(dev);
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bool do_wakeup = device_may_wakeup(dev);
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int ret;
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ret = ohci_suspend(hcd, do_wakeup);
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if (ret)
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return ret;
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if (pdata->power_suspend)
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pdata->power_suspend(pdev);
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return ret;
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}
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static int st_ohci_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 usb_ohci_pdata *pdata = dev_get_platdata(dev);
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struct platform_device *pdev = to_platform_device(dev);
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int err;
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if (pdata->power_on) {
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err = pdata->power_on(pdev);
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if (err < 0)
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return err;
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}
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ohci_resume(hcd, false);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume);
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#endif /* CONFIG_PM_SLEEP */
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static const struct of_device_id st_ohci_platform_ids[] = {
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{ .compatible = "st,st-ohci-300x", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, st_ohci_platform_ids);
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static struct platform_driver ohci_platform_driver = {
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.probe = st_ohci_platform_probe,
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.remove = st_ohci_platform_remove,
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.name = "st-ohci",
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#ifdef CONFIG_PM_SLEEP
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.pm = &st_ohci_pm_ops,
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#endif
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.of_match_table = st_ohci_platform_ids,
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}
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};
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static int __init ohci_platform_init(void)
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{
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if (usb_disabled())
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return -ENODEV;
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pr_info("%s: " DRIVER_DESC "\n", hcd_name);
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ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
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return platform_driver_register(&ohci_platform_driver);
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}
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module_init(ohci_platform_init);
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static void __exit ohci_platform_cleanup(void)
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{
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platform_driver_unregister(&ohci_platform_driver);
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}
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module_exit(ohci_platform_cleanup);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
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MODULE_LICENSE("GPL");
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