linux/drivers/phy/phy-samsung-usb2.c

247 lines
6.1 KiB
C
Raw Normal View History

/*
* Samsung SoC USB 1.1/2.0 PHY driver
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* Author: Kamil Debski <k.debski@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include "phy-samsung-usb2.h"
static int samsung_usb2_phy_power_on(struct phy *phy)
{
struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
struct samsung_usb2_phy_driver *drv = inst->drv;
int ret;
dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
inst->cfg->label);
ret = clk_prepare_enable(drv->clk);
if (ret)
goto err_main_clk;
ret = clk_prepare_enable(drv->ref_clk);
if (ret)
goto err_instance_clk;
if (inst->cfg->power_on) {
spin_lock(&drv->lock);
ret = inst->cfg->power_on(inst);
spin_unlock(&drv->lock);
if (ret)
goto err_power_on;
}
return 0;
err_power_on:
clk_disable_unprepare(drv->ref_clk);
err_instance_clk:
clk_disable_unprepare(drv->clk);
err_main_clk:
return ret;
}
static int samsung_usb2_phy_power_off(struct phy *phy)
{
struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
struct samsung_usb2_phy_driver *drv = inst->drv;
int ret;
dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
inst->cfg->label);
if (inst->cfg->power_off) {
spin_lock(&drv->lock);
ret = inst->cfg->power_off(inst);
spin_unlock(&drv->lock);
if (ret)
return ret;
}
clk_disable_unprepare(drv->ref_clk);
clk_disable_unprepare(drv->clk);
return 0;
}
static struct phy_ops samsung_usb2_phy_ops = {
.power_on = samsung_usb2_phy_power_on,
.power_off = samsung_usb2_phy_power_off,
.owner = THIS_MODULE,
};
static struct phy *samsung_usb2_phy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct samsung_usb2_phy_driver *drv;
drv = dev_get_drvdata(dev);
if (!drv)
return ERR_PTR(-EINVAL);
if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
return ERR_PTR(-ENODEV);
return drv->instances[args->args[0]].phy;
}
static const struct of_device_id samsung_usb2_phy_of_match[] = {
#ifdef CONFIG_PHY_EXYNOS4X12_USB2
{
.compatible = "samsung,exynos3250-usb2-phy",
.data = &exynos3250_usb2_phy_config,
},
#endif
#ifdef CONFIG_PHY_EXYNOS4210_USB2
{
.compatible = "samsung,exynos4210-usb2-phy",
.data = &exynos4210_usb2_phy_config,
},
#endif
#ifdef CONFIG_PHY_EXYNOS4X12_USB2
{
.compatible = "samsung,exynos4x12-usb2-phy",
.data = &exynos4x12_usb2_phy_config,
},
#endif
#ifdef CONFIG_PHY_EXYNOS5250_USB2
{
.compatible = "samsung,exynos5250-usb2-phy",
.data = &exynos5250_usb2_phy_config,
},
ARM: SoC platform changes for 3.17 This is the bulk of new SoC enablement and other platform changes for 3.17: * Samsung S5PV210 has been converted to DT and multiplatform * Clock drivers and bindings for some of the lower-end i.MX 1/2 platforms * Kirkwood, one of the popular Marvell platforms, is folded into the mvebu platform code, removing mach-kirkwood. * Hwmod data for TI AM43xx and DRA7 platforms. * More additions of Renesas shmobile platform support * Removal of plat-samsung contents that can be removed with S5PV210 being multiplatform/DT-enabled and the other two old platforms being removed. New platforms (most with only basic support right now): * Hisilicon X5HD2 settop box chipset is introduced * Mediatek MT6589 (mobile chipset) is introduced * Broadcom BCM7xxx settop box chipset is introduced + as usual a lot other pieces all over the platform code. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) iQIcBAABAgAGBQJT5Dp+AAoJEIwa5zzehBx3w1sP/0vjT/LQOmC8Lv8RW2Ley2ua hNu3HcNPnT/N40JEdU9YNv3q0fdxGgcfKj011CNN+49zPSUf1xduk2wfCAk9yV50 8Sbt1PfDGm1YyUugGN420CzI431pPoM1OGXHZHkAmg+2J286RtUi3NckB//QDbCY QhEjhpYc9SXhAOCGwmB4ab7thOljOFSPzKTLMTu3+PNI5zRPRgkDkt6w9XlsAYmB nuR271BnzsROkMzAjycwaJ3kdim7wqrMRfk8g96o0jHSF5qf4zsT5uWYYAjTxdUQ 8Ajz6zjeHe4+95TwTDcq+lCX6rDLZgwkvCAc6hFbeg0uR7Dyek0h6XMEYtwdjaiU KNPwOENrYdENNDAGRpkFp1x4h/rY9Plfru0bBo5o6t7aPBvmNeCDzRtlTtLiUNDV dG8sfDMtrS/wFHVjylDSQ60Mb+wuW0XneC8D7chY/iRhIllUYi6YXXvt+/tH5C20 oYDOWqqcDFSb0sJhE5pn4KBV82ZaHx9jMBWGLl+erg2sDX/SK8SxOkLqKYZKtKB5 0leOGE3Y+C70xt3G9HftLz2sAvvt+C8UPsApPT+dHNE401TWJOYx6LphPkQKjeeK P1iwKi+It3l+FaBypgJy/LeMQRy7EyvDBK2I5WoVL/R2qq14EmP1ui3Tthjj0bhq tBBof6P9c8OnRVj1Lz3R =5TJ6 -----END PGP SIGNATURE----- Merge tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC platform changes from Olof Johansson: "This is the bulk of new SoC enablement and other platform changes for 3.17: - Samsung S5PV210 has been converted to DT and multiplatform - Clock drivers and bindings for some of the lower-end i.MX 1/2 platforms - Kirkwood, one of the popular Marvell platforms, is folded into the mvebu platform code, removing mach-kirkwood - Hwmod data for TI AM43xx and DRA7 platforms - More additions of Renesas shmobile platform support - Removal of plat-samsung contents that can be removed with S5PV210 being multiplatform/DT-enabled and the other two old platforms being removed New platforms (most with only basic support right now): - Hisilicon X5HD2 settop box chipset is introduced - Mediatek MT6589 (mobile chipset) is introduced - Broadcom BCM7xxx settop box chipset is introduced + as usual a lot other pieces all over the platform code" * tag 'soc-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (240 commits) ARM: hisi: remove smp from machine descriptor power: reset: move hisilicon reboot code ARM: dts: Add hix5hd2-dkb dts file. ARM: debug: Rename Hi3716 to HIX5HD2 ARM: hisi: enable hix5hd2 SoC ARM: hisi: add ARCH_HISI MAINTAINERS: add entry for Broadcom ARM STB architecture ARM: brcmstb: select GISB arbiter and interrupt drivers ARM: brcmstb: add infrastructure for ARM-based Broadcom STB SoCs ARM: configs: enable SMP in bcm_defconfig ARM: add SMP support for Broadcom mobile SoCs Documentation: arm: misc updates to Marvell EBU SoC status Documentation: arm: add URLs to public datasheets for the Marvell Armada XP SoC ARM: mvebu: fix build without platforms selected ARM: mvebu: add cpuidle support for Armada 38x ARM: mvebu: add cpuidle support for Armada 370 cpuidle: mvebu: add Armada 38x support cpuidle: mvebu: add Armada 370 support cpuidle: mvebu: rename the driver from armada-370-xp to mvebu-v7 ARM: mvebu: export the SCU address ...
2014-08-09 02:14:29 +08:00
#endif
#ifdef CONFIG_PHY_S5PV210_USB2
{
.compatible = "samsung,s5pv210-usb2-phy",
.data = &s5pv210_usb2_phy_config,
},
#endif
{ },
};
MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
static int samsung_usb2_phy_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
const struct samsung_usb2_phy_config *cfg;
struct device *dev = &pdev->dev;
struct phy_provider *phy_provider;
struct resource *mem;
struct samsung_usb2_phy_driver *drv;
int i, ret;
if (!pdev->dev.of_node) {
dev_err(dev, "This driver is required to be instantiated from device tree\n");
return -EINVAL;
}
match = of_match_node(samsung_usb2_phy_of_match, pdev->dev.of_node);
if (!match) {
dev_err(dev, "of_match_node() failed\n");
return -EINVAL;
}
cfg = match->data;
drv = devm_kzalloc(dev, sizeof(struct samsung_usb2_phy_driver) +
cfg->num_phys * sizeof(struct samsung_usb2_phy_instance),
GFP_KERNEL);
if (!drv)
return -ENOMEM;
dev_set_drvdata(dev, drv);
spin_lock_init(&drv->lock);
drv->cfg = cfg;
drv->dev = dev;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drv->reg_phy = devm_ioremap_resource(dev, mem);
if (IS_ERR(drv->reg_phy)) {
dev_err(dev, "Failed to map register memory (phy)\n");
return PTR_ERR(drv->reg_phy);
}
drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"samsung,pmureg-phandle");
if (IS_ERR(drv->reg_pmu)) {
dev_err(dev, "Failed to map PMU registers (via syscon)\n");
return PTR_ERR(drv->reg_pmu);
}
if (drv->cfg->has_mode_switch) {
drv->reg_sys = syscon_regmap_lookup_by_phandle(
pdev->dev.of_node, "samsung,sysreg-phandle");
if (IS_ERR(drv->reg_sys)) {
dev_err(dev, "Failed to map system registers (via syscon)\n");
return PTR_ERR(drv->reg_sys);
}
}
drv->clk = devm_clk_get(dev, "phy");
if (IS_ERR(drv->clk)) {
dev_err(dev, "Failed to get clock of phy controller\n");
return PTR_ERR(drv->clk);
}
drv->ref_clk = devm_clk_get(dev, "ref");
if (IS_ERR(drv->ref_clk)) {
dev_err(dev, "Failed to get reference clock for the phy controller\n");
return PTR_ERR(drv->ref_clk);
}
drv->ref_rate = clk_get_rate(drv->ref_clk);
if (drv->cfg->rate_to_clk) {
ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
if (ret)
return ret;
}
for (i = 0; i < drv->cfg->num_phys; i++) {
char *label = drv->cfg->phys[i].label;
struct samsung_usb2_phy_instance *p = &drv->instances[i];
dev_dbg(dev, "Creating phy \"%s\"\n", label);
p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
if (IS_ERR(p->phy)) {
dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
label);
return PTR_ERR(p->phy);
}
p->cfg = &drv->cfg->phys[i];
p->drv = drv;
phy_set_bus_width(p->phy, 8);
phy_set_drvdata(p->phy, p);
}
phy_provider = devm_of_phy_provider_register(dev,
samsung_usb2_phy_xlate);
if (IS_ERR(phy_provider)) {
dev_err(drv->dev, "Failed to register phy provider\n");
return PTR_ERR(phy_provider);
}
return 0;
}
static struct platform_driver samsung_usb2_phy_driver = {
.probe = samsung_usb2_phy_probe,
.driver = {
.of_match_table = samsung_usb2_phy_of_match,
.name = "samsung-usb2-phy",
}
};
module_platform_driver(samsung_usb2_phy_driver);
MODULE_DESCRIPTION("Samsung S5P/EXYNOS SoC USB PHY driver");
MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:samsung-usb2-phy");