From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Griffin Subject: [PATCH v4 2/5] usb: host: ohci-st: Add OHCI driver support for ST STB devices Date: Thu, 7 Aug 2014 16:21:41 +0100 Message-ID: <1407424904-19251-3-git-send-email-peter.griffin@linaro.org> References: <1407424904-19251-1-git-send-email-peter.griffin@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1407424904-19251-1-git-send-email-peter.griffin@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, arnd@arndb.de, stern@rowland.harvard.edu, gregkh@linuxfoundation.org, srinivas.kandagatla@gmail.com, maxime.coquelin@st.com, patrice.chotard@st.com Cc: peter.griffin@linaro.org, lee.jones@linaro.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org This patch adds the glue code required to ensure the on-chip OHCI controller works on STi consumer electronics SoC's from STMicroelectron= ics. It mainly manages the setting and enabling of the relevant clocks and m= anages the reset / power signals to the IP block. Signed-off-by: Peter Griffin --- drivers/usb/host/Kconfig | 8 ++ drivers/usb/host/Makefile | 1 + drivers/usb/host/ohci-st.c | 337 +++++++++++++++++++++++++++++++++++++= ++++++++ 3 files changed, 346 insertions(+) create mode 100644 drivers/usb/host/ohci-st.c diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 03314f8..4b577f6 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -753,6 +753,14 @@ config USB_HCD_SSB =20 If unsure, say N. =20 +config USB_HCD_ST + tristate "ST USB driver for ST SoC Series" + depends on ARCH_STI && OF + select GENERIC_PHY + help + Enable support for the on-chip OHCI & EHCI controller found on + STMicroelectronics consumer electronics SoC's. + config USB_HCD_TEST_MODE bool "HCD test mode support" ---help--- diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index af89a90..df7e5ac 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -74,3 +74,4 @@ obj-$(CONFIG_USB_HCD_SSB) +=3D ssb-hcd.o obj-$(CONFIG_USB_FUSBH200_HCD) +=3D fusbh200-hcd.o obj-$(CONFIG_USB_FOTG210_HCD) +=3D fotg210-hcd.o obj-$(CONFIG_USB_MAX3421_HCD) +=3D max3421-hcd.o +obj-$(CONFIG_USB_HCD_ST) +=3D ehci-st.o ohci-st.o diff --git a/drivers/usb/host/ohci-st.c b/drivers/usb/host/ohci-st.c new file mode 100644 index 0000000..263132a --- /dev/null +++ b/drivers/usb/host/ohci-st.c @@ -0,0 +1,337 @@ +/* + * ST OHCI driver + * + * Copyright (C) 2014 STMicroelectronics =E2=80=93 All Rights Reserved + * + * Author: Peter Griffin + * + * Derived from ohci-platform.c + * + * This program is free software; you can redistribute it and/or modif= y + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "ohci.h" +#include "usb-st-common.h" + +#define DRIVER_DESC "OHCI STMicroelectronics driver" + +#define hcd_to_ohci_priv(h) ((struct st_platform_priv *)hcd_to_ohci(h)= ->priv) + +static const char hcd_name[] =3D "ohci-st"; + +static int st_ohci_platform_power_on(struct platform_device *dev) +{ + struct usb_hcd *hcd =3D platform_get_drvdata(dev); + struct st_platform_priv *priv =3D hcd_to_ohci_priv(hcd); + int clk, ret; + + ret =3D reset_control_deassert(priv->pwr); + if (ret) + return ret; + + ret =3D 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 =3D clk_set_rate(priv->clk48, 48000000); + if (ret) + goto err_assert_reset; + } + + for (clk =3D 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) { + ret =3D clk_prepare_enable(priv->clks[clk]); + if (ret) + goto err_disable_clks; + } + + ret =3D phy_init(priv->phy); + if (ret) + goto err_disable_clks; + + ret =3D 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 >=3D 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 =3D platform_get_drvdata(dev); + struct st_platform_priv *priv =3D 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 =3D USB_MAX_CLKS - 1; clk >=3D 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 __initcon= st =3D { + .product_desc =3D "ST OHCI controller", + .extra_priv_size =3D sizeof(struct st_platform_priv), +}; + +static struct usb_ohci_pdata ohci_platform_defaults =3D { + .power_on =3D st_ohci_platform_power_on, + .power_suspend =3D st_ohci_platform_power_off, + .power_off =3D 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 =3D &ohci_platform_defaults; + struct st_platform_priv *priv; + struct ohci_hcd *ohci; + int err, irq, clk =3D 0; + + if (usb_disabled()) + return -ENODEV; + + irq =3D platform_get_irq(dev, 0); + if (irq < 0) { + dev_err(&dev->dev, "no irq provided"); + return irq; + } + + res_mem =3D platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res_mem) { + dev_err(&dev->dev, "no memory resource provided"); + return -ENXIO; + } + + hcd =3D 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 =3D pdata; + priv =3D hcd_to_ohci_priv(hcd); + ohci =3D hcd_to_ohci(hcd); + + priv->phy =3D devm_phy_get(&dev->dev, "usb"); + if (IS_ERR(priv->phy)) { + err =3D PTR_ERR(priv->phy); + goto err_put_hcd; + } + + for (clk =3D 0; clk < USB_MAX_CLKS; clk++) { + priv->clks[clk] =3D of_clk_get(dev->dev.of_node, clk); + if (IS_ERR(priv->clks[clk])) { + err =3D PTR_ERR(priv->clks[clk]); + if (err =3D=3D -EPROBE_DEFER) + goto err_put_clks; + priv->clks[clk] =3D NULL; + break; + } + } + + /* some SoCs don't have a dedicated 48Mhz clock, but those that + do need the rate to be explicitly set */ + priv->clk48 =3D devm_clk_get(&dev->dev, "clk48"); + if (IS_ERR(priv->clk48)) { + dev_info(&dev->dev, "48MHz clk not found\n"); + priv->clk48 =3D NULL; + } + + priv->pwr =3D devm_reset_control_get_optional(&dev->dev, "power"); + if (IS_ERR(priv->pwr)) { + err =3D PTR_ERR(priv->pwr); + goto err_put_clks; + } + + priv->rst =3D devm_reset_control_get_optional(&dev->dev, "softreset")= ; + if (IS_ERR(priv->rst)) { + err =3D PTR_ERR(priv->rst); + goto err_put_clks; + } + + if (pdata->power_on) { + err =3D pdata->power_on(dev); + if (err < 0) + goto err_power; + } + + hcd->rsrc_start =3D res_mem->start; + hcd->rsrc_len =3D resource_size(res_mem); + + hcd->regs =3D devm_ioremap_resource(&dev->dev, res_mem); + if (IS_ERR(hcd->regs)) { + err =3D PTR_ERR(hcd->regs); + goto err_power; + } + err =3D 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 >=3D 0) + clk_put(priv->clks[clk]); +err_put_hcd: + if (pdata =3D=3D &ohci_platform_defaults) + dev->dev.platform_data =3D NULL; + + usb_put_hcd(hcd); + + return err; +} + +static int st_ohci_platform_remove(struct platform_device *dev) +{ + struct usb_hcd *hcd =3D platform_get_drvdata(dev); + struct usb_ohci_pdata *pdata =3D dev_get_platdata(&dev->dev); + struct st_platform_priv *priv =3D hcd_to_ohci_priv(hcd); + int clk; + + usb_remove_hcd(hcd); + + if (pdata->power_off) + pdata->power_off(dev); + + + for (clk =3D 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) + clk_put(priv->clks[clk]); + + usb_put_hcd(hcd); + + if (pdata =3D=3D &ohci_platform_defaults) + dev->dev.platform_data =3D NULL; + + return 0; +} + +#ifdef CONFIG_PM + +static int st_ohci_suspend(struct device *dev) +{ + struct usb_hcd *hcd =3D dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata =3D dev->platform_data; + struct platform_device *pdev =3D + container_of(dev, struct platform_device, dev); + bool do_wakeup =3D device_may_wakeup(dev); + int ret; + + ret =3D 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 =3D dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata =3D dev_get_platdata(dev); + struct platform_device *pdev =3D + container_of(dev, struct platform_device, dev); + int err; + + if (pdata->power_on) { + err =3D pdata->power_on(pdev); + if (err < 0) + return err; + } + + ohci_resume(hcd, false); + return 0; +} + +#endif /* CONFIG_PM */ + +static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resu= me); + +static const struct of_device_id st_ohci_platform_ids[] =3D { + { .compatible =3D "st,st-ohci-300x", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, st_ohci_platform_ids); + +static struct platform_driver ohci_platform_driver =3D { + .probe =3D st_ohci_platform_probe, + .remove =3D st_ohci_platform_remove, + .shutdown =3D usb_hcd_platform_shutdown, + .driver =3D { + .name =3D "st-ohci", + .pm =3D &st_ohci_pm_ops, + .of_match_table =3D st_ohci_platform_ids, + } +}; + +static int __init ohci_platform_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + 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 "); +MODULE_LICENSE("GPL"); --=20 1.9.1