satip-axe/kernel/drivers/usb/host/hcd-stm.c
2015-08-03 18:26:47 +02:00

426 lines
11 KiB
C

/*
* HCD (Host Controller Driver) for USB.
*
* Copyright (c) 2009 STMicroelectronics Limited
* Author: Francesco Virlinzi
*
* Bus Glue for STMicroelectronics STx710x devices.
*
* This file is licenced under the GPL.
*/
#include <linux/platform_device.h>
#include <linux/stm/platform.h>
#include <linux/stm/device.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
#include <linux/usb.h>
#include <linux/io.h>
#include "../core/hcd.h"
#include "hcd-stm.h"
#undef dgb_print
#ifdef CONFIG_USB_DEBUG
#define dgb_print(fmt, args...) \
pr_debug("%s: " fmt, __func__ , ## args)
#else
#define dgb_print(fmt, args...)
#endif
#define USB_48_CLK 0
#define USB_IC_CLK 1
#define USB_PHY_CLK 2
static void stm_usb_clk_xxable(struct drv_usb_data *drv_data, int enable)
{
int i;
struct clk *clk;
for (i = 0; i < USB_CLKS_NR; ++i) {
clk = drv_data->clks[i];
if (!clk || IS_ERR(clk))
continue;
if (enable) {
/*
* On some chip the USB_48_CLK comes from
* ClockGen_B. In this case a clk_set_rate
* is welcome because the code becomes
* target_pack independant
*/
if (clk_enable(clk) == 0 && i == USB_48_CLK)
clk_set_rate(clk, 48000000);
} else
clk_disable(clk);
}
}
static void stm_usb_clk_enable(struct drv_usb_data *drv_data)
{
stm_usb_clk_xxable(drv_data, 1);
}
static void stm_usb_clk_disable(struct drv_usb_data *drv_data)
{
stm_usb_clk_xxable(drv_data, 0);
}
static int stm_usb_boot(struct platform_device *pdev)
{
struct stm_plat_usb_data *pl_data = pdev->dev.platform_data;
struct drv_usb_data *usb_data = platform_get_drvdata(pdev);
void *wrapper_base = usb_data->ahb2stbus_wrapper_glue_base;
void *protocol_base = usb_data->ahb2stbus_protocol_base;
unsigned long reg, req_reg;
unsigned long flags = pl_data->flags;
if (flags & (STM_PLAT_USB_FLAGS_STRAP_8BIT |
STM_PLAT_USB_FLAGS_STRAP_16BIT)) {
/* Set strap mode */
reg = readl(wrapper_base + AHB2STBUS_STRAP_OFFSET);
if (flags & STM_PLAT_USB_FLAGS_STRAP_16BIT)
reg |= AHB2STBUS_STRAP_16_BIT;
else
reg &= ~AHB2STBUS_STRAP_16_BIT;
writel(reg, wrapper_base + AHB2STBUS_STRAP_OFFSET);
}
if (flags & STM_PLAT_USB_FLAGS_STRAP_PLL) {
/* Start PLL */
reg = readl(wrapper_base + AHB2STBUS_STRAP_OFFSET);
writel(reg | AHB2STBUS_STRAP_PLL,
wrapper_base + AHB2STBUS_STRAP_OFFSET);
mdelay(30);
writel(reg & (~AHB2STBUS_STRAP_PLL),
wrapper_base + AHB2STBUS_STRAP_OFFSET);
mdelay(30);
}
if (flags & STM_PLAT_USB_FLAGS_OPC_MSGSIZE_CHUNKSIZE) {
/* Set the STBus Opcode Config for load/store 32 */
writel(AHB2STBUS_STBUS_OPC_32BIT,
protocol_base + AHB2STBUS_STBUS_OPC_OFFSET);
/* Set the Message Size Config to n packets per message */
writel(AHB2STBUS_MSGSIZE_4,
protocol_base + AHB2STBUS_MSGSIZE_OFFSET);
/* Set the chunksize to n packets */
writel(AHB2STBUS_CHUNKSIZE_4,
protocol_base + AHB2STBUS_CHUNKSIZE_OFFSET);
}
if (flags &
(STM_PLAT_USB_FLAGS_STBUS_CONFIG_THRESHOLD128 |
STM_PLAT_USB_FLAGS_STBUS_CONFIG_THRESHOLD256)) {
req_reg = (1<<21) | /* Turn on read-ahead */
(5<<16) | /* Opcode is store/load 32 */
(0<<15) | /* Turn off write posting */
(1<<14) | /* Enable threshold */
(3<<9) | /* 2**3 Packets in a chunk */
(0<<4) ; /* No messages */
req_reg |= ((pl_data->flags &
STM_PLAT_USB_FLAGS_STBUS_CONFIG_THRESHOLD128) ?
(7<<0) : /* 128 */
(8<<0)); /* 256 */
do {
writel(req_reg, protocol_base +
AHB2STBUS_MSGSIZE_OFFSET);
reg = readl(protocol_base + AHB2STBUS_MSGSIZE_OFFSET);
} while ((reg & 0x7FFFFFFF) != req_reg);
}
return 0;
}
static int stm_usb_remove(struct platform_device *pdev)
{
struct drv_usb_data *dr_data = platform_get_drvdata(pdev);
platform_device_unregister(dr_data->ehci_device);
platform_device_unregister(dr_data->ohci_device);
stm_device_power(dr_data->device_state, stm_device_power_off);
stm_usb_clk_disable(dr_data);
return 0;
}
/*
* Slightly modified version of platform_device_register_simple()
* which assigns parent and has no resources.
*/
static struct platform_device
*stm_usb_device_create(const char *name, int id, struct platform_device *parent)
{
struct platform_device *pdev;
int retval;
pdev = platform_device_alloc(name, id);
if (!pdev) {
retval = -ENOMEM;
goto error;
}
pdev->dev.parent = &parent->dev;
pdev->dev.dma_mask = parent->dev.dma_mask;
retval = platform_device_add(pdev);
if (retval)
goto error;
return pdev;
error:
platform_device_put(pdev);
return ERR_PTR(retval);
}
static int __init stm_usb_probe(struct platform_device *pdev)
{
struct stm_plat_usb_data *plat_data = pdev->dev.platform_data;
struct drv_usb_data *dr_data;
struct device *dev = &pdev->dev;
struct resource *res;
int i;
static char __initdata *usb_clks_n[USB_CLKS_NR] = {
[USB_48_CLK] = "usb_48_clk",
[USB_IC_CLK] = "usb_ic_clk",
[USB_PHY_CLK] = "usb_phy_clk"
};
resource_size_t len;
dgb_print("\n");
dr_data = devm_kzalloc(dev, sizeof(*dr_data), GFP_KERNEL);
if (!dr_data)
return -ENOMEM;
platform_set_drvdata(pdev, dr_data);
for (i = 0; i < USB_CLKS_NR; ++i) {
dr_data->clks[i] = clk_get(dev, usb_clks_n[i]);
if (!dr_data->clks[i] || IS_ERR(dr_data->clks[i]))
pr_warning("%s: %s clock not found for %s\n",
__func__, usb_clks_n[i], dev_name(dev));
}
stm_usb_clk_enable(dr_data);
dr_data->device_state =
devm_stm_device_init(&pdev->dev, plat_data->device_config);
if (!dr_data->device_state)
return -EBUSY;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "wrapper");
if (!res)
return -ENXIO;
len = resource_size(res);
if (devm_request_mem_region(dev, res->start, len, pdev->name) < 0)
return -EBUSY;
dr_data->ahb2stbus_wrapper_glue_base =
devm_ioremap_nocache(dev, res->start, len);
if (!dr_data->ahb2stbus_wrapper_glue_base)
return -EFAULT;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "protocol");
if (!res)
return -ENXIO;
len = resource_size(res);
if (devm_request_mem_region(dev, res->start, len, pdev->name) < 0)
return -EBUSY;
dr_data->ahb2stbus_protocol_base =
devm_ioremap_nocache(dev, res->start, len);
if (!dr_data->ahb2stbus_protocol_base)
return -EFAULT;
stm_usb_boot(pdev);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ehci");
if (res) {
dr_data->ehci_device = stm_usb_device_create("stm-ehci",
pdev->id, pdev);
if (IS_ERR(dr_data->ehci_device))
return PTR_ERR(dr_data->ehci_device);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ohci");
if (res) {
dr_data->ohci_device =
stm_usb_device_create("stm-ohci", pdev->id, pdev);
if (IS_ERR(dr_data->ohci_device)) {
platform_device_del(dr_data->ehci_device);
return PTR_ERR(dr_data->ohci_device);
}
}
/* Initialize the pm_runtime fields */
pm_runtime_set_active(&pdev->dev);
pm_suspend_ignore_children(&pdev->dev, 1);
pm_runtime_enable(&pdev->dev);
return 0;
}
static void stm_usb_shutdown(struct platform_device *pdev)
{
struct drv_usb_data *dr_data = platform_get_drvdata(pdev);
dgb_print("\n");
stm_device_power(dr_data->device_state, stm_device_power_off);
stm_usb_clk_disable(dr_data);
}
#ifdef CONFIG_PM
static int stm_usb_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct drv_usb_data *dr_data = dev_get_drvdata(dev);
struct stm_plat_usb_data *pl_data = pdev->dev.platform_data;
void *wrapper_base = dr_data->ahb2stbus_wrapper_glue_base;
void *protocol_base = dr_data->ahb2stbus_protocol_base;
long reg;
dgb_print("\n");
#ifdef CONFIG_PM_RUNTIME
if (dev->power.runtime_status != RPM_ACTIVE)
return 0; /* usb already suspended via runtime_suspend */
#endif
if (pl_data->flags & STM_PLAT_USB_FLAGS_STRAP_PLL) {
/* PLL turned off */
reg = readl(wrapper_base + AHB2STBUS_STRAP_OFFSET);
writel(reg | AHB2STBUS_STRAP_PLL,
wrapper_base + AHB2STBUS_STRAP_OFFSET);
}
writel(0, wrapper_base + AHB2STBUS_STRAP_OFFSET);
writel(0, protocol_base + AHB2STBUS_STBUS_OPC_OFFSET);
writel(0, protocol_base + AHB2STBUS_MSGSIZE_OFFSET);
writel(0, protocol_base + AHB2STBUS_CHUNKSIZE_OFFSET);
writel(0, protocol_base + AHB2STBUS_MSGSIZE_OFFSET);
writel(1, protocol_base + AHB2STBUS_SW_RESET);
mdelay(10);
writel(0, protocol_base + AHB2STBUS_SW_RESET);
stm_device_power(dr_data->device_state, stm_device_power_off);
stm_usb_clk_disable(dr_data);
return 0;
}
static int stm_usb_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct drv_usb_data *dr_data = dev_get_drvdata(dev);
#ifdef CONFIG_PM_RUNTIME
if (dev->power.runtime_status == RPM_SUSPENDED)
return 0; /* usb wants resume via runtime_resume... */
#endif
dgb_print("\n");
stm_usb_clk_enable(dr_data);
stm_device_power(dr_data->device_state, stm_device_power_on);
stm_usb_boot(pdev);
return 0;
}
#else
#define stm_usb_suspend NULL
#define stm_usb_resume NULL
#endif
#ifdef CONFIG_PM_RUNTIME
static int stm_usb_runtime_suspend(struct device *dev)
{
struct drv_usb_data *dr_data = dev_get_drvdata(dev);
if (dev->power.runtime_status == RPM_SUSPENDED) {
dgb_print("%s already suspended\n", dev_name(dev));
return 0;
}
dgb_print("Runtime suspending %s\n", dev_name(dev));
#if defined(CONFIG_USB_EHCI_HCD) || defined(CONFIG_USB_EHCI_HCD_MODULE)
if (dr_data->ehci_device)
stm_ehci_hcd_unregister(dr_data->ehci_device);
#endif
#if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
if (dr_data->ohci_device)
stm_ohci_hcd_unregister(dr_data->ohci_device);
#endif
return stm_usb_suspend(dev);
}
static int stm_usb_runtime_resume(struct device *dev)
{
struct drv_usb_data *dr_data = dev_get_drvdata(dev);
if (dev->power.runtime_status == RPM_ACTIVE) {
dgb_print("%s already active\n", dev_name(dev));
return 0;
}
dgb_print("Runtime resuming: %s\n", dev_name(dev));
stm_usb_resume(dev);
#if defined(CONFIG_USB_EHCI_HCD) || defined(CONFIG_USB_EHCI_HCD_MODULE)
if (dr_data->ehci_device)
stm_ehci_hcd_register(dr_data->ehci_device);
#endif
#if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
if (dr_data->ohci_device)
stm_ohci_hcd_register(dr_data->ohci_device);
#endif
return 0;
}
#else
#define stm_usb_runtime_suspend NULL
#define stm_usb_runtime_resume NULL
#endif
static struct dev_pm_ops stm_usb_pm = {
.suspend = stm_usb_suspend, /* on standby/memstandby */
.resume = stm_usb_resume, /* resume from standby/memstandby */
.runtime_suspend = stm_usb_runtime_suspend,
.runtime_resume = stm_usb_runtime_resume,
};
static struct platform_driver stm_usb_driver = {
.driver = {
.name = "stm-usb",
.owner = THIS_MODULE,
.pm = &stm_usb_pm,
},
.probe = stm_usb_probe,
.shutdown = stm_usb_shutdown,
.remove = stm_usb_remove,
};
static int __init stm_usb_init(void)
{
return platform_driver_register(&stm_usb_driver);
}
static void __exit stm_usb_exit(void)
{
platform_driver_unregister(&stm_usb_driver);
}
MODULE_LICENSE("GPL");
module_init(stm_usb_init);
module_exit(stm_usb_exit);