diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/usb/host/ohci-st.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/usb/host/ohci-st.c')
-rw-r--r-- | drivers/usb/host/ohci-st.c | 338 |
1 files changed, 338 insertions, 0 deletions
diff --git a/drivers/usb/host/ohci-st.c b/drivers/usb/host/ohci-st.c new file mode 100644 index 000000000..82eef3c62 --- /dev/null +++ b/drivers/usb/host/ohci-st.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ST OHCI driver + * + * Copyright (C) 2014 STMicroelectronics – All Rights Reserved + * + * Author: Peter Griffin <peter.griffin@linaro.org> + * + * Derived from ohci-platform.c + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/hrtimer.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/phy/phy.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/usb/ohci_pdriver.h> +#include <linux/usb.h> +#include <linux/usb/hcd.h> + +#include "ohci.h" + +#define USB_MAX_CLKS 3 + +struct st_ohci_platform_priv { + struct clk *clks[USB_MAX_CLKS]; + struct clk *clk48; + struct reset_control *rst; + struct reset_control *pwr; + struct phy *phy; +}; + +#define DRIVER_DESC "OHCI STMicroelectronics driver" + +#define hcd_to_ohci_priv(h) \ + ((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv) + +static int st_ohci_platform_power_on(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk, ret; + + ret = reset_control_deassert(priv->pwr); + if (ret) + return ret; + + ret = reset_control_deassert(priv->rst); + if (ret) + goto err_assert_power; + + /* some SoCs don't have a dedicated 48Mhz clock, but those that do + need the rate to be explicitly set */ + if (priv->clk48) { + ret = clk_set_rate(priv->clk48, 48000000); + if (ret) + goto err_assert_reset; + } + + for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) { + ret = clk_prepare_enable(priv->clks[clk]); + if (ret) + goto err_disable_clks; + } + + ret = phy_init(priv->phy); + if (ret) + goto err_disable_clks; + + ret = phy_power_on(priv->phy); + if (ret) + goto err_exit_phy; + + return 0; + +err_exit_phy: + phy_exit(priv->phy); +err_disable_clks: + while (--clk >= 0) + clk_disable_unprepare(priv->clks[clk]); +err_assert_reset: + reset_control_assert(priv->rst); +err_assert_power: + reset_control_assert(priv->pwr); + + return ret; +} + +static void st_ohci_platform_power_off(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + + int clk; + + reset_control_assert(priv->pwr); + + reset_control_assert(priv->rst); + + phy_power_off(priv->phy); + + phy_exit(priv->phy); + + for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--) + if (priv->clks[clk]) + clk_disable_unprepare(priv->clks[clk]); +} + +static struct hc_driver __read_mostly ohci_platform_hc_driver; + +static const struct ohci_driver_overrides platform_overrides __initconst = { + .product_desc = "ST OHCI controller", + .extra_priv_size = sizeof(struct st_ohci_platform_priv), +}; + +static struct usb_ohci_pdata ohci_platform_defaults = { + .power_on = st_ohci_platform_power_on, + .power_suspend = st_ohci_platform_power_off, + .power_off = st_ohci_platform_power_off, +}; + +static int st_ohci_platform_probe(struct platform_device *dev) +{ + struct usb_hcd *hcd; + struct resource *res_mem; + struct usb_ohci_pdata *pdata = &ohci_platform_defaults; + struct st_ohci_platform_priv *priv; + int err, irq, clk = 0; + + if (usb_disabled()) + return -ENODEV; + + irq = platform_get_irq(dev, 0); + if (irq < 0) + return irq; + + res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res_mem) { + dev_err(&dev->dev, "no memory resource provided"); + return -ENXIO; + } + + hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, + dev_name(&dev->dev)); + if (!hcd) + return -ENOMEM; + + platform_set_drvdata(dev, hcd); + dev->dev.platform_data = pdata; + priv = hcd_to_ohci_priv(hcd); + + priv->phy = devm_phy_get(&dev->dev, "usb"); + if (IS_ERR(priv->phy)) { + err = PTR_ERR(priv->phy); + goto err_put_hcd; + } + + for (clk = 0; clk < USB_MAX_CLKS; clk++) { + priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); + if (IS_ERR(priv->clks[clk])) { + err = PTR_ERR(priv->clks[clk]); + if (err == -EPROBE_DEFER) + goto err_put_clks; + priv->clks[clk] = NULL; + break; + } + } + + /* some SoCs don't have a dedicated 48Mhz clock, but those that + do need the rate to be explicitly set */ + priv->clk48 = devm_clk_get(&dev->dev, "clk48"); + if (IS_ERR(priv->clk48)) { + dev_info(&dev->dev, "48MHz clk not found\n"); + priv->clk48 = NULL; + } + + priv->pwr = + devm_reset_control_get_optional_shared(&dev->dev, "power"); + if (IS_ERR(priv->pwr)) { + err = PTR_ERR(priv->pwr); + goto err_put_clks; + } + + priv->rst = + devm_reset_control_get_optional_shared(&dev->dev, "softreset"); + if (IS_ERR(priv->rst)) { + err = PTR_ERR(priv->rst); + goto err_put_clks; + } + + if (pdata->power_on) { + err = pdata->power_on(dev); + if (err < 0) + goto err_power; + } + + hcd->rsrc_start = res_mem->start; + hcd->rsrc_len = resource_size(res_mem); + + hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); + if (IS_ERR(hcd->regs)) { + err = PTR_ERR(hcd->regs); + goto err_power; + } + err = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (err) + goto err_power; + + device_wakeup_enable(hcd->self.controller); + + platform_set_drvdata(dev, hcd); + + return err; + +err_power: + if (pdata->power_off) + pdata->power_off(dev); + +err_put_clks: + while (--clk >= 0) + clk_put(priv->clks[clk]); +err_put_hcd: + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + + usb_put_hcd(hcd); + + return err; +} + +static int st_ohci_platform_remove(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); + struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk; + + usb_remove_hcd(hcd); + + if (pdata->power_off) + pdata->power_off(dev); + + + for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) + clk_put(priv->clks[clk]); + + usb_put_hcd(hcd); + + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + + return 0; +} + +#ifdef CONFIG_PM_SLEEP + +static int st_ohci_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev->platform_data; + struct platform_device *pdev = to_platform_device(dev); + bool do_wakeup = device_may_wakeup(dev); + int ret; + + ret = ohci_suspend(hcd, do_wakeup); + if (ret) + return ret; + + if (pdata->power_suspend) + pdata->power_suspend(pdev); + + return ret; +} + +static int st_ohci_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev_get_platdata(dev); + struct platform_device *pdev = to_platform_device(dev); + int err; + + if (pdata->power_on) { + err = pdata->power_on(pdev); + if (err < 0) + return err; + } + + ohci_resume(hcd, false); + return 0; +} + +static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume); + +#endif /* CONFIG_PM_SLEEP */ + +static const struct of_device_id st_ohci_platform_ids[] = { + { .compatible = "st,st-ohci-300x", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, st_ohci_platform_ids); + +static struct platform_driver ohci_platform_driver = { + .probe = st_ohci_platform_probe, + .remove = st_ohci_platform_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "st-ohci", +#ifdef CONFIG_PM_SLEEP + .pm = &st_ohci_pm_ops, +#endif + .of_match_table = st_ohci_platform_ids, + } +}; + +static int __init ohci_platform_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides); + return platform_driver_register(&ohci_platform_driver); +} +module_init(ohci_platform_init); + +static void __exit ohci_platform_cleanup(void) +{ + platform_driver_unregister(&ohci_platform_driver); +} +module_exit(ohci_platform_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>"); +MODULE_LICENSE("GPL"); |