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364 lines
8.2 KiB
364 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* ST EHCI 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 <[email protected]> |
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* |
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* Derived from ehci-platform.c |
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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/err.h> |
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#include <linux/kernel.h> |
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#include <linux/hrtimer.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.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.h> |
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#include <linux/usb/hcd.h> |
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#include <linux/usb/ehci_pdriver.h> |
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#include <linux/pinctrl/consumer.h> |
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#include "ehci.h" |
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#define USB_MAX_CLKS 3 |
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struct st_ehci_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 "EHCI STMicroelectronics driver" |
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#define hcd_to_ehci_priv(h) \ |
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((struct st_ehci_platform_priv *)hcd_to_ehci(h)->priv) |
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static const char hcd_name[] = "ehci-st"; |
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#define EHCI_CAPS_SIZE 0x10 |
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#define AHB2STBUS_INSREG01 (EHCI_CAPS_SIZE + 0x84) |
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static int st_ehci_platform_reset(struct usb_hcd *hcd) |
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{ |
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struct platform_device *pdev = to_platform_device(hcd->self.controller); |
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struct usb_ehci_pdata *pdata = dev_get_platdata(&pdev->dev); |
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struct ehci_hcd *ehci = hcd_to_ehci(hcd); |
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u32 threshold; |
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/* Set EHCI packet buffer IN/OUT threshold to 128 bytes */ |
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threshold = 128 | (128 << 16); |
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writel(threshold, hcd->regs + AHB2STBUS_INSREG01); |
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ehci->caps = hcd->regs + pdata->caps_offset; |
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return ehci_setup(hcd); |
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} |
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static int st_ehci_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_ehci_platform_priv *priv = hcd_to_ehci_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_ehci_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_ehci_platform_priv *priv = hcd_to_ehci_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 ehci_platform_hc_driver; |
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static const struct ehci_driver_overrides platform_overrides __initconst = { |
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.reset = st_ehci_platform_reset, |
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.extra_priv_size = sizeof(struct st_ehci_platform_priv), |
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}; |
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static struct usb_ehci_pdata ehci_platform_defaults = { |
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.power_on = st_ehci_platform_power_on, |
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.power_suspend = st_ehci_platform_power_off, |
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.power_off = st_ehci_platform_power_off, |
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}; |
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static int st_ehci_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_ehci_pdata *pdata = &ehci_platform_defaults; |
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struct st_ehci_platform_priv *priv; |
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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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return irq; |
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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(&ehci_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_ehci_priv(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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if (err == -EPROBE_DEFER) |
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goto err_put_clks; |
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priv->pwr = NULL; |
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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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if (err == -EPROBE_DEFER) |
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goto err_put_clks; |
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priv->rst = NULL; |
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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_put_clks; |
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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_put_clks; |
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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_put_clks; |
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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_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 == &ehci_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_ehci_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_ehci_pdata *pdata = dev_get_platdata(&dev->dev); |
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struct st_ehci_platform_priv *priv = hcd_to_ehci_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 == &ehci_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_ehci_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_ehci_pdata *pdata = dev_get_platdata(dev); |
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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 = ehci_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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pinctrl_pm_select_sleep_state(dev); |
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return ret; |
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} |
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static int st_ehci_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_ehci_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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pinctrl_pm_select_default_state(dev); |
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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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ehci_resume(hcd, false); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(st_ehci_pm_ops, st_ehci_suspend, st_ehci_resume); |
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#endif /* CONFIG_PM_SLEEP */ |
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static const struct of_device_id st_ehci_ids[] = { |
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{ .compatible = "st,st-ehci-300x", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, st_ehci_ids); |
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static struct platform_driver ehci_platform_driver = { |
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.probe = st_ehci_platform_probe, |
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.remove = st_ehci_platform_remove, |
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.shutdown = usb_hcd_platform_shutdown, |
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.driver = { |
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.name = "st-ehci", |
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#ifdef CONFIG_PM_SLEEP |
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.pm = &st_ehci_pm_ops, |
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#endif |
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.of_match_table = st_ehci_ids, |
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} |
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}; |
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static int __init ehci_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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ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides); |
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return platform_driver_register(&ehci_platform_driver); |
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} |
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module_init(ehci_platform_init); |
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static void __exit ehci_platform_cleanup(void) |
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{ |
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platform_driver_unregister(&ehci_platform_driver); |
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} |
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module_exit(ehci_platform_cleanup); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_AUTHOR("Peter Griffin <[email protected]>"); |
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MODULE_LICENSE("GPL");
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