usb: phy: samsung: Introducing usb phy driver for hsotg

This driver uses usb_phy interface to interact with s3c-hsotg. Supports
phy_init and phy_shutdown functions to enable/disable usb phy. Support
will be extended to host controllers and more Samsung SoCs.

Signed-off-by: Praveen Paneri <p.paneri@samsung.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Praveen Paneri 2012-11-23 16:03:06 +05:30 committed by Felipe Balbi
parent 04a6221c50
commit 337dc3a768
5 changed files with 401 additions and 0 deletions

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@ -0,0 +1,11 @@
* Samsung's usb phy transceiver
The Samsung's phy transceiver is used for controlling usb otg phy for
s3c-hsotg usb device controller.
TODO: Adding the PHY binding with controller(s) according to the under
developement generic PHY driver.
Required properties:
- compatible : should be "samsung,exynos4210-usbphy"
- reg : base physical address of the phy registers and length of memory mapped
region.

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@ -45,3 +45,11 @@ config USB_RCAR_PHY
To compile this driver as a module, choose M here: the
module will be called rcar-phy.
config SAMSUNG_USBPHY
bool "Samsung USB PHY controller Driver"
depends on USB_S3C_HSOTG
select USB_OTG_UTILS
help
Enable this to support Samsung USB phy controller for samsung
SoCs.

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@ -9,3 +9,4 @@ obj-$(CONFIG_USB_ISP1301) += isp1301.o
obj-$(CONFIG_MV_U3D_PHY) += mv_u3d_phy.o
obj-$(CONFIG_USB_EHCI_TEGRA) += tegra_usb_phy.o
obj-$(CONFIG_USB_RCAR_PHY) += rcar-phy.o
obj-$(CONFIG_SAMSUNG_USBPHY) += samsung-usbphy.o

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@ -0,0 +1,354 @@
/* linux/drivers/usb/phy/samsung-usbphy.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Praveen Paneri <p.paneri@samsung.com>
*
* Samsung USB2.0 High-speed OTG transceiver, talks to S3C HS OTG controller
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/usb/otg.h>
#include <linux/platform_data/samsung-usbphy.h>
/* Register definitions */
#define SAMSUNG_PHYPWR (0x00)
#define PHYPWR_NORMAL_MASK (0x19 << 0)
#define PHYPWR_OTG_DISABLE (0x1 << 4)
#define PHYPWR_ANALOG_POWERDOWN (0x1 << 3)
#define PHYPWR_FORCE_SUSPEND (0x1 << 1)
/* For Exynos4 */
#define PHYPWR_NORMAL_MASK_PHY0 (0x39 << 0)
#define PHYPWR_SLEEP_PHY0 (0x1 << 5)
#define SAMSUNG_PHYCLK (0x04)
#define PHYCLK_MODE_USB11 (0x1 << 6)
#define PHYCLK_EXT_OSC (0x1 << 5)
#define PHYCLK_COMMON_ON_N (0x1 << 4)
#define PHYCLK_ID_PULL (0x1 << 2)
#define PHYCLK_CLKSEL_MASK (0x3 << 0)
#define PHYCLK_CLKSEL_48M (0x0 << 0)
#define PHYCLK_CLKSEL_12M (0x2 << 0)
#define PHYCLK_CLKSEL_24M (0x3 << 0)
#define SAMSUNG_RSTCON (0x08)
#define RSTCON_PHYLINK_SWRST (0x1 << 2)
#define RSTCON_HLINK_SWRST (0x1 << 1)
#define RSTCON_SWRST (0x1 << 0)
#ifndef MHZ
#define MHZ (1000*1000)
#endif
enum samsung_cpu_type {
TYPE_S3C64XX,
TYPE_EXYNOS4210,
};
/*
* struct samsung_usbphy - transceiver driver state
* @phy: transceiver structure
* @plat: platform data
* @dev: The parent device supplied to the probe function
* @clk: usb phy clock
* @regs: usb phy register memory base
* @ref_clk_freq: reference clock frequency selection
* @cpu_type: machine identifier
*/
struct samsung_usbphy {
struct usb_phy phy;
struct samsung_usbphy_data *plat;
struct device *dev;
struct clk *clk;
void __iomem *regs;
int ref_clk_freq;
int cpu_type;
};
#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy)
/*
* Returns reference clock frequency selection value
*/
static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
{
struct clk *ref_clk;
int refclk_freq = 0;
ref_clk = clk_get(sphy->dev, "xusbxti");
if (IS_ERR(ref_clk)) {
dev_err(sphy->dev, "Failed to get reference clock\n");
return PTR_ERR(ref_clk);
}
switch (clk_get_rate(ref_clk)) {
case 12 * MHZ:
refclk_freq = PHYCLK_CLKSEL_12M;
break;
case 24 * MHZ:
refclk_freq = PHYCLK_CLKSEL_24M;
break;
case 48 * MHZ:
refclk_freq = PHYCLK_CLKSEL_48M;
break;
default:
if (sphy->cpu_type == TYPE_S3C64XX)
refclk_freq = PHYCLK_CLKSEL_48M;
else
refclk_freq = PHYCLK_CLKSEL_24M;
break;
}
clk_put(ref_clk);
return refclk_freq;
}
static void samsung_usbphy_enable(struct samsung_usbphy *sphy)
{
void __iomem *regs = sphy->regs;
u32 phypwr;
u32 phyclk;
u32 rstcon;
/* set clock frequency for PLL */
phyclk = sphy->ref_clk_freq;
phypwr = readl(regs + SAMSUNG_PHYPWR);
rstcon = readl(regs + SAMSUNG_RSTCON);
switch (sphy->cpu_type) {
case TYPE_S3C64XX:
phyclk &= ~PHYCLK_COMMON_ON_N;
phypwr &= ~PHYPWR_NORMAL_MASK;
rstcon |= RSTCON_SWRST;
break;
case TYPE_EXYNOS4210:
phypwr &= ~PHYPWR_NORMAL_MASK_PHY0;
rstcon |= RSTCON_SWRST;
default:
break;
}
writel(phyclk, regs + SAMSUNG_PHYCLK);
/* Configure PHY0 for normal operation*/
writel(phypwr, regs + SAMSUNG_PHYPWR);
/* reset all ports of PHY and Link */
writel(rstcon, regs + SAMSUNG_RSTCON);
udelay(10);
rstcon &= ~RSTCON_SWRST;
writel(rstcon, regs + SAMSUNG_RSTCON);
}
static void samsung_usbphy_disable(struct samsung_usbphy *sphy)
{
void __iomem *regs = sphy->regs;
u32 phypwr;
phypwr = readl(regs + SAMSUNG_PHYPWR);
switch (sphy->cpu_type) {
case TYPE_S3C64XX:
phypwr |= PHYPWR_NORMAL_MASK;
break;
case TYPE_EXYNOS4210:
phypwr |= PHYPWR_NORMAL_MASK_PHY0;
default:
break;
}
/* Disable analog and otg block power */
writel(phypwr, regs + SAMSUNG_PHYPWR);
}
/*
* The function passed to the usb driver for phy initialization
*/
static int samsung_usbphy_init(struct usb_phy *phy)
{
struct samsung_usbphy *sphy;
int ret = 0;
sphy = phy_to_sphy(phy);
/* Enable the phy clock */
ret = clk_prepare_enable(sphy->clk);
if (ret) {
dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
return ret;
}
/* Disable phy isolation */
if (sphy->plat && sphy->plat->pmu_isolation)
sphy->plat->pmu_isolation(false);
/* Initialize usb phy registers */
samsung_usbphy_enable(sphy);
/* Disable the phy clock */
clk_disable_unprepare(sphy->clk);
return ret;
}
/*
* The function passed to the usb driver for phy shutdown
*/
static void samsung_usbphy_shutdown(struct usb_phy *phy)
{
struct samsung_usbphy *sphy;
sphy = phy_to_sphy(phy);
if (clk_prepare_enable(sphy->clk)) {
dev_err(sphy->dev, "%s: clk_prepare_enable failed\n", __func__);
return;
}
/* De-initialize usb phy registers */
samsung_usbphy_disable(sphy);
/* Enable phy isolation */
if (sphy->plat && sphy->plat->pmu_isolation)
sphy->plat->pmu_isolation(true);
clk_disable_unprepare(sphy->clk);
}
static const struct of_device_id samsung_usbphy_dt_match[];
static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev)
{
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(samsung_usbphy_dt_match,
pdev->dev.of_node);
return (int) match->data;
}
return platform_get_device_id(pdev)->driver_data;
}
static int __devinit samsung_usbphy_probe(struct platform_device *pdev)
{
struct samsung_usbphy *sphy;
struct samsung_usbphy_data *pdata;
struct device *dev = &pdev->dev;
struct resource *phy_mem;
void __iomem *phy_base;
struct clk *clk;
pdata = pdev->dev.platform_data;
if (!pdata) {
dev_err(&pdev->dev, "%s: no platform data defined\n", __func__);
return -EINVAL;
}
phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!phy_mem) {
dev_err(dev, "%s: missing mem resource\n", __func__);
return -ENODEV;
}
phy_base = devm_request_and_ioremap(dev, phy_mem);
if (!phy_base) {
dev_err(dev, "%s: register mapping failed\n", __func__);
return -ENXIO;
}
sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL);
if (!sphy)
return -ENOMEM;
clk = devm_clk_get(dev, "otg");
if (IS_ERR(clk)) {
dev_err(dev, "Failed to get otg clock\n");
return PTR_ERR(clk);
}
sphy->dev = &pdev->dev;
sphy->plat = pdata;
sphy->regs = phy_base;
sphy->clk = clk;
sphy->phy.dev = sphy->dev;
sphy->phy.label = "samsung-usbphy";
sphy->phy.init = samsung_usbphy_init;
sphy->phy.shutdown = samsung_usbphy_shutdown;
sphy->cpu_type = samsung_usbphy_get_driver_data(pdev);
sphy->ref_clk_freq = samsung_usbphy_get_refclk_freq(sphy);
platform_set_drvdata(pdev, sphy);
return usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2);
}
static int __exit samsung_usbphy_remove(struct platform_device *pdev)
{
struct samsung_usbphy *sphy = platform_get_drvdata(pdev);
usb_remove_phy(&sphy->phy);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id samsung_usbphy_dt_match[] = {
{
.compatible = "samsung,s3c64xx-usbphy",
.data = (void *)TYPE_S3C64XX,
}, {
.compatible = "samsung,exynos4210-usbphy",
.data = (void *)TYPE_EXYNOS4210,
},
{},
};
MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match);
#endif
static struct platform_device_id samsung_usbphy_driver_ids[] = {
{
.name = "s3c64xx-usbphy",
.driver_data = TYPE_S3C64XX,
}, {
.name = "exynos4210-usbphy",
.driver_data = TYPE_EXYNOS4210,
},
{},
};
MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids);
static struct platform_driver samsung_usbphy_driver = {
.probe = samsung_usbphy_probe,
.remove = __devexit_p(samsung_usbphy_remove),
.id_table = samsung_usbphy_driver_ids,
.driver = {
.name = "samsung-usbphy",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(samsung_usbphy_dt_match),
},
};
module_platform_driver(samsung_usbphy_driver);
MODULE_DESCRIPTION("Samsung USB phy controller");
MODULE_AUTHOR("Praveen Paneri <p.paneri@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-usbphy");

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@ -0,0 +1,27 @@
/*
* Copyright (C) 2012 Samsung Electronics Co.Ltd
* http://www.samsung.com/
* Author: Praveen Paneri <p.paneri@samsung.com>
*
* Defines platform data for samsung usb phy driver.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#ifndef __SAMSUNG_USBPHY_PLATFORM_H
#define __SAMSUNG_USBPHY_PLATFORM_H
/**
* samsung_usbphy_data - Platform data for USB PHY driver.
* @pmu_isolation: Function to control usb phy isolation in PMU.
*/
struct samsung_usbphy_data {
void (*pmu_isolation)(int on);
};
extern void samsung_usbphy_set_pdata(struct samsung_usbphy_data *pd);
#endif /* __SAMSUNG_USBPHY_PLATFORM_H */