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linux/drivers/mfd/omap-usb-tll.c
Keshava Munegowda 16fa3dc75c mfd: omap-usb-tll: HOST TLL platform driver 
The platform driver for the TLL component of the OMAP USB host controller
is implemented. Depending on the TLL hardware revision , the TLL channels
are configured. The USB HS core driver uses this driver through exported
APIs from the TLL platform driver.
usb_tll_enable and usb_tll_disble are the exported APIs of the USB TLL
platform driver.

Signed-off-by: Keshava Munegowda <keshava_mgowda@ti.com>
Reviewed-by: Partha Basak <parthab@india.ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2012-09-21 23:39:24 +02:00

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/**
* omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
*
* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
* Author: Keshava Munegowda <keshava_mgowda@ti.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 of
* the License 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/err.h>
#include <plat/usb.h>
#include <linux/pm_runtime.h>
#define USBTLL_DRIVER_NAME "usbhs_tll"
/* TLL Register Set */
#define OMAP_USBTLL_REVISION (0x00)
#define OMAP_USBTLL_SYSCONFIG (0x10)
#define OMAP_USBTLL_SYSCONFIG_CACTIVITY (1 << 8)
#define OMAP_USBTLL_SYSCONFIG_SIDLEMODE (1 << 3)
#define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP (1 << 2)
#define OMAP_USBTLL_SYSCONFIG_SOFTRESET (1 << 1)
#define OMAP_USBTLL_SYSCONFIG_AUTOIDLE (1 << 0)
#define OMAP_USBTLL_SYSSTATUS (0x14)
#define OMAP_USBTLL_SYSSTATUS_RESETDONE (1 << 0)
#define OMAP_USBTLL_IRQSTATUS (0x18)
#define OMAP_USBTLL_IRQENABLE (0x1C)
#define OMAP_TLL_SHARED_CONF (0x30)
#define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN (1 << 6)
#define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN (1 << 5)
#define OMAP_TLL_SHARED_CONF_USB_DIVRATION (1 << 2)
#define OMAP_TLL_SHARED_CONF_FCLK_REQ (1 << 1)
#define OMAP_TLL_SHARED_CONF_FCLK_IS_ON (1 << 0)
#define OMAP_TLL_CHANNEL_CONF(num) (0x040 + 0x004 * num)
#define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT 24
#define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF (1 << 11)
#define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE (1 << 10)
#define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE (1 << 9)
#define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE (1 << 8)
#define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS (1 << 1)
#define OMAP_TLL_CHANNEL_CONF_CHANEN (1 << 0)
#define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0 0x0
#define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM 0x1
#define OMAP_TLL_FSLSMODE_3PIN_PHY 0x2
#define OMAP_TLL_FSLSMODE_4PIN_PHY 0x3
#define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0 0x4
#define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM 0x5
#define OMAP_TLL_FSLSMODE_3PIN_TLL 0x6
#define OMAP_TLL_FSLSMODE_4PIN_TLL 0x7
#define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0 0xA
#define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM 0xB
#define OMAP_TLL_ULPI_FUNCTION_CTRL(num) (0x804 + 0x100 * num)
#define OMAP_TLL_ULPI_INTERFACE_CTRL(num) (0x807 + 0x100 * num)
#define OMAP_TLL_ULPI_OTG_CTRL(num) (0x80A + 0x100 * num)
#define OMAP_TLL_ULPI_INT_EN_RISE(num) (0x80D + 0x100 * num)
#define OMAP_TLL_ULPI_INT_EN_FALL(num) (0x810 + 0x100 * num)
#define OMAP_TLL_ULPI_INT_STATUS(num) (0x813 + 0x100 * num)
#define OMAP_TLL_ULPI_INT_LATCH(num) (0x814 + 0x100 * num)
#define OMAP_TLL_ULPI_DEBUG(num) (0x815 + 0x100 * num)
#define OMAP_TLL_ULPI_SCRATCH_REGISTER(num) (0x816 + 0x100 * num)
#define OMAP_REV2_TLL_CHANNEL_COUNT 2
#define OMAP_TLL_CHANNEL_COUNT 3
#define OMAP_TLL_CHANNEL_1_EN_MASK (1 << 0)
#define OMAP_TLL_CHANNEL_2_EN_MASK (1 << 1)
#define OMAP_TLL_CHANNEL_3_EN_MASK (1 << 2)
/* Values of USBTLL_REVISION - Note: these are not given in the TRM */
#define OMAP_USBTLL_REV1 0x00000015 /* OMAP3 */
#define OMAP_USBTLL_REV2 0x00000018 /* OMAP 3630 */
#define OMAP_USBTLL_REV3 0x00000004 /* OMAP4 */
#define is_ehci_tll_mode(x) (x == OMAP_EHCI_PORT_MODE_TLL)
struct usbtll_omap {
struct clk *usbtll_p1_fck;
struct clk *usbtll_p2_fck;
struct usbtll_omap_platform_data platdata;
/* secure the register updates */
spinlock_t lock;
};
/*-------------------------------------------------------------------------*/
const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
struct platform_device *tll_pdev;
/*-------------------------------------------------------------------------*/
static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
{
__raw_writel(val, base + reg);
}
static inline u32 usbtll_read(void __iomem *base, u32 reg)
{
return __raw_readl(base + reg);
}
static inline void usbtll_writeb(void __iomem *base, u8 reg, u8 val)
{
__raw_writeb(val, base + reg);
}
static inline u8 usbtll_readb(void __iomem *base, u8 reg)
{
return __raw_readb(base + reg);
}
/*-------------------------------------------------------------------------*/
static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
{
switch (pmode) {
case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
return true;
default:
return false;
}
}
/*
* convert the port-mode enum to a value we can use in the FSLSMODE
* field of USBTLL_CHANNEL_CONF
*/
static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
{
switch (mode) {
case OMAP_USBHS_PORT_MODE_UNUSED:
case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
return OMAP_TLL_FSLSMODE_3PIN_PHY;
case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
return OMAP_TLL_FSLSMODE_4PIN_PHY;
case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
return OMAP_TLL_FSLSMODE_3PIN_TLL;
case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
return OMAP_TLL_FSLSMODE_4PIN_TLL;
case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
default:
pr_warn("Invalid port mode, using default\n");
return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
}
}
/**
* usbtll_omap_probe - initialize TI-based HCDs
*
* Allocates basic resources for this USB host controller.
*/
static int __devinit usbtll_omap_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct usbtll_omap_platform_data *pdata = dev->platform_data;
void __iomem *base;
struct resource *res;
struct usbtll_omap *tll;
unsigned reg;
unsigned long flags;
int ret = 0;
int i, ver, count;
dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
tll = kzalloc(sizeof(struct usbtll_omap), GFP_KERNEL);
if (!tll) {
dev_err(dev, "Memory allocation failed\n");
ret = -ENOMEM;
goto end;
}
spin_lock_init(&tll->lock);
for (i = 0; i < OMAP3_HS_USB_PORTS; i++)
tll->platdata.port_mode[i] = pdata->port_mode[i];
tll->usbtll_p1_fck = clk_get(dev, "usb_tll_hs_usb_ch0_clk");
if (IS_ERR(tll->usbtll_p1_fck)) {
ret = PTR_ERR(tll->usbtll_p1_fck);
dev_err(dev, "usbtll_p1_fck failed error:%d\n", ret);
goto err_tll;
}
tll->usbtll_p2_fck = clk_get(dev, "usb_tll_hs_usb_ch1_clk");
if (IS_ERR(tll->usbtll_p2_fck)) {
ret = PTR_ERR(tll->usbtll_p2_fck);
dev_err(dev, "usbtll_p2_fck failed error:%d\n", ret);
goto err_usbtll_p1_fck;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "usb tll get resource failed\n");
ret = -ENODEV;
goto err_usbtll_p2_fck;
}
base = ioremap(res->start, resource_size(res));
if (!base) {
dev_err(dev, "TLL ioremap failed\n");
ret = -ENOMEM;
goto err_usbtll_p2_fck;
}
platform_set_drvdata(pdev, tll);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
spin_lock_irqsave(&tll->lock, flags);
ver = usbtll_read(base, OMAP_USBTLL_REVISION);
switch (ver) {
case OMAP_USBTLL_REV1:
case OMAP_USBTLL_REV2:
count = OMAP_TLL_CHANNEL_COUNT;
break;
case OMAP_USBTLL_REV3:
count = OMAP_REV2_TLL_CHANNEL_COUNT;
break;
default:
dev_err(dev, "TLL version failed\n");
ret = -ENODEV;
goto err_ioremap;
}
if (is_ehci_tll_mode(pdata->port_mode[0]) ||
is_ehci_tll_mode(pdata->port_mode[1]) ||
is_ehci_tll_mode(pdata->port_mode[2]) ||
is_ohci_port(pdata->port_mode[0]) ||
is_ohci_port(pdata->port_mode[1]) ||
is_ohci_port(pdata->port_mode[2])) {
/* Program Common TLL register */
reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
| OMAP_TLL_SHARED_CONF_USB_DIVRATION);
reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
/* Enable channels now */
for (i = 0; i < count; i++) {
reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
if (is_ohci_port(pdata->port_mode[i])) {
reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
<< OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
} else if (pdata->port_mode[i] ==
OMAP_EHCI_PORT_MODE_TLL) {
/*
* Disable AutoIdle, BitStuffing
* and use SDR Mode
*/
reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
| OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
| OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
} else {
continue;
}
reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
usbtll_writeb(base,
OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
0xbe);
}
}
err_ioremap:
spin_unlock_irqrestore(&tll->lock, flags);
iounmap(base);
pm_runtime_put_sync(dev);
tll_pdev = pdev;
if (!ret)
goto end;
pm_runtime_disable(dev);
err_usbtll_p2_fck:
clk_put(tll->usbtll_p2_fck);
err_usbtll_p1_fck:
clk_put(tll->usbtll_p1_fck);
err_tll:
kfree(tll);
end:
return ret;
}
/**
* usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
* @pdev: USB Host Controller being removed
*
* Reverses the effect of usbtll_omap_probe().
*/
static int __devexit usbtll_omap_remove(struct platform_device *pdev)
{
struct usbtll_omap *tll = platform_get_drvdata(pdev);
clk_put(tll->usbtll_p2_fck);
clk_put(tll->usbtll_p1_fck);
pm_runtime_disable(&pdev->dev);
kfree(tll);
return 0;
}
static int usbtll_runtime_resume(struct device *dev)
{
struct usbtll_omap *tll = dev_get_drvdata(dev);
struct usbtll_omap_platform_data *pdata = &tll->platdata;
unsigned long flags;
dev_dbg(dev, "usbtll_runtime_resume\n");
if (!pdata) {
dev_dbg(dev, "missing platform_data\n");
return -ENODEV;
}
spin_lock_irqsave(&tll->lock, flags);
if (is_ehci_tll_mode(pdata->port_mode[0]))
clk_enable(tll->usbtll_p1_fck);
if (is_ehci_tll_mode(pdata->port_mode[1]))
clk_enable(tll->usbtll_p2_fck);
spin_unlock_irqrestore(&tll->lock, flags);
return 0;
}
static int usbtll_runtime_suspend(struct device *dev)
{
struct usbtll_omap *tll = dev_get_drvdata(dev);
struct usbtll_omap_platform_data *pdata = &tll->platdata;
unsigned long flags;
dev_dbg(dev, "usbtll_runtime_suspend\n");
if (!pdata) {
dev_dbg(dev, "missing platform_data\n");
return -ENODEV;
}
spin_lock_irqsave(&tll->lock, flags);
if (is_ehci_tll_mode(pdata->port_mode[0]))
clk_disable(tll->usbtll_p1_fck);
if (is_ehci_tll_mode(pdata->port_mode[1]))
clk_disable(tll->usbtll_p2_fck);
spin_unlock_irqrestore(&tll->lock, flags);
return 0;
}
static const struct dev_pm_ops usbtllomap_dev_pm_ops = {
SET_RUNTIME_PM_OPS(usbtll_runtime_suspend,
usbtll_runtime_resume,
NULL)
};
static struct platform_driver usbtll_omap_driver = {
.driver = {
.name = (char *)usbtll_driver_name,
.owner = THIS_MODULE,
.pm = &usbtllomap_dev_pm_ops,
},
.probe = usbtll_omap_probe,
.remove = __devexit_p(usbtll_omap_remove),
};
int omap_tll_enable(void)
{
if (!tll_pdev) {
pr_err("missing omap usbhs tll platform_data\n");
return -ENODEV;
}
return pm_runtime_get_sync(&tll_pdev->dev);
}
EXPORT_SYMBOL_GPL(omap_tll_enable);
int omap_tll_disable(void)
{
if (!tll_pdev) {
pr_err("missing omap usbhs tll platform_data\n");
return -ENODEV;
}
return pm_runtime_put_sync(&tll_pdev->dev);
}
EXPORT_SYMBOL_GPL(omap_tll_disable);
MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
static int __init omap_usbtll_drvinit(void)
{
return platform_driver_register(&usbtll_omap_driver);
}
/*
* init before usbhs core driver;
* The usbtll driver should be initialized before
* the usbhs core driver probe function is called.
*/
fs_initcall(omap_usbtll_drvinit);
static void __exit omap_usbtll_drvexit(void)
{
platform_driver_unregister(&usbtll_omap_driver);
}
module_exit(omap_usbtll_drvexit);
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