linux/drivers/usb/phy/phy-samsung-usb.c
Dongjin Kim 6d3d61f821 usb: phy: samsung: Add support HSIC on Exynos4X12
This patch adds to enable High Speed Inter Chip on Exynos4X12. Both channels
are controlled by usbphy driver based on the patch series of usbphy driver
submitted by Tomasz Figa.

[1] https://patchwork.kernel.org/patch/2576121
[2] https://patchwork.kernel.org/patch/2576131
[3] https://patchwork.kernel.org/patch/2576141
[4] https://patchwork.kernel.org/patch/2576151
[5] https://patchwork.kernel.org/patch/2576161
[6] https://patchwork.kernel.org/patch/2576171

Signed-off-by: Dongjin Kim <tobetter@gmail.com>
Cc: Tomasz Figa <t.figa@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
2013-05-28 20:16:37 +03:00

242 lines
5.6 KiB
C

/* linux/drivers/usb/phy/phy-samsung-usb.c
*
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Praveen Paneri <p.paneri@samsung.com>
*
* Samsung USB-PHY helper driver with common function calls;
* interacts with Samsung USB 2.0 PHY controller driver and later
* with Samsung USB 3.0 PHY driver.
*
* 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/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/usb/samsung_usb_phy.h>
#include "phy-samsung-usb.h"
int samsung_usbphy_parse_dt(struct samsung_usbphy *sphy)
{
struct device_node *usbphy_sys;
/* Getting node for system controller interface for usb-phy */
usbphy_sys = of_get_child_by_name(sphy->dev->of_node, "usbphy-sys");
if (!usbphy_sys) {
dev_err(sphy->dev, "No sys-controller interface for usb-phy\n");
return -ENODEV;
}
sphy->pmuregs = of_iomap(usbphy_sys, 0);
if (sphy->pmuregs == NULL) {
dev_err(sphy->dev, "Can't get usb-phy pmu control register\n");
goto err0;
}
sphy->sysreg = of_iomap(usbphy_sys, 1);
/*
* Not returning error code here, since this situation is not fatal.
* Few SoCs may not have this switch available
*/
if (sphy->sysreg == NULL)
dev_warn(sphy->dev, "Can't get usb-phy sysreg cfg register\n");
of_node_put(usbphy_sys);
return 0;
err0:
of_node_put(usbphy_sys);
return -ENXIO;
}
EXPORT_SYMBOL_GPL(samsung_usbphy_parse_dt);
/*
* Set isolation here for phy.
* Here 'on = true' would mean USB PHY block is isolated, hence
* de-activated and vice-versa.
*/
void samsung_usbphy_set_isolation_4210(struct samsung_usbphy *sphy, bool on)
{
void __iomem *reg = NULL;
u32 reg_val;
u32 en_mask = 0;
if (!sphy->pmuregs) {
dev_warn(sphy->dev, "Can't set pmu isolation\n");
return;
}
if (sphy->phy_type == USB_PHY_TYPE_DEVICE) {
reg = sphy->pmuregs + sphy->drv_data->devphy_reg_offset;
en_mask = sphy->drv_data->devphy_en_mask;
} else if (sphy->phy_type == USB_PHY_TYPE_HOST) {
reg = sphy->pmuregs + sphy->drv_data->hostphy_reg_offset;
en_mask = sphy->drv_data->hostphy_en_mask;
}
reg_val = readl(reg);
if (on)
reg_val &= ~en_mask;
else
reg_val |= en_mask;
writel(reg_val, reg);
if (sphy->drv_data->cpu_type == TYPE_EXYNOS4X12) {
writel(reg_val, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL0);
writel(reg_val, sphy->pmuregs + EXYNOS4X12_PHY_HSIC_CTRL1);
}
}
EXPORT_SYMBOL_GPL(samsung_usbphy_set_isolation_4210);
/*
* Configure the mode of working of usb-phy here: HOST/DEVICE.
*/
void samsung_usbphy_cfg_sel(struct samsung_usbphy *sphy)
{
u32 reg;
if (!sphy->sysreg) {
dev_warn(sphy->dev, "Can't configure specified phy mode\n");
return;
}
reg = readl(sphy->sysreg);
if (sphy->phy_type == USB_PHY_TYPE_DEVICE)
reg &= ~EXYNOS_USB20PHY_CFG_HOST_LINK;
else if (sphy->phy_type == USB_PHY_TYPE_HOST)
reg |= EXYNOS_USB20PHY_CFG_HOST_LINK;
writel(reg, sphy->sysreg);
}
EXPORT_SYMBOL_GPL(samsung_usbphy_cfg_sel);
/*
* PHYs are different for USB Device and USB Host.
* This make sure that correct PHY type is selected before
* any operation on PHY.
*/
int samsung_usbphy_set_type(struct usb_phy *phy,
enum samsung_usb_phy_type phy_type)
{
struct samsung_usbphy *sphy = phy_to_sphy(phy);
sphy->phy_type = phy_type;
return 0;
}
EXPORT_SYMBOL_GPL(samsung_usbphy_set_type);
int samsung_usbphy_rate_to_clksel_64xx(struct samsung_usbphy *sphy,
unsigned long rate)
{
unsigned int clksel;
switch (rate) {
case 12 * MHZ:
clksel = PHYCLK_CLKSEL_12M;
break;
case 24 * MHZ:
clksel = PHYCLK_CLKSEL_24M;
break;
case 48 * MHZ:
clksel = PHYCLK_CLKSEL_48M;
break;
default:
dev_err(sphy->dev,
"Invalid reference clock frequency: %lu\n", rate);
return -EINVAL;
}
return clksel;
}
EXPORT_SYMBOL_GPL(samsung_usbphy_rate_to_clksel_64xx);
int samsung_usbphy_rate_to_clksel_4x12(struct samsung_usbphy *sphy,
unsigned long rate)
{
unsigned int clksel;
switch (rate) {
case 9600 * KHZ:
clksel = FSEL_CLKSEL_9600K;
break;
case 10 * MHZ:
clksel = FSEL_CLKSEL_10M;
break;
case 12 * MHZ:
clksel = FSEL_CLKSEL_12M;
break;
case 19200 * KHZ:
clksel = FSEL_CLKSEL_19200K;
break;
case 20 * MHZ:
clksel = FSEL_CLKSEL_20M;
break;
case 24 * MHZ:
clksel = FSEL_CLKSEL_24M;
break;
case 50 * MHZ:
clksel = FSEL_CLKSEL_50M;
break;
default:
dev_err(sphy->dev,
"Invalid reference clock frequency: %lu\n", rate);
return -EINVAL;
}
return clksel;
}
EXPORT_SYMBOL_GPL(samsung_usbphy_rate_to_clksel_4x12);
/*
* Returns reference clock frequency selection value
*/
int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy)
{
struct clk *ref_clk;
unsigned long rate;
int refclk_freq;
/*
* In exynos5250 USB host and device PHY use
* external crystal clock XXTI
*/
if (sphy->drv_data->cpu_type == TYPE_EXYNOS5250)
ref_clk = clk_get(sphy->dev, "ext_xtal");
else
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);
}
rate = clk_get_rate(ref_clk);
refclk_freq = sphy->drv_data->rate_to_clksel(sphy, rate);
clk_put(ref_clk);
return refclk_freq;
}
EXPORT_SYMBOL_GPL(samsung_usbphy_get_refclk_freq);