/*
* OHCI HCD (Host Controller Driver) for USB.
*
* (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
* (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
* (C) Copyright 2002 Hewlett-Packard Company
*
* USB Bus Glue for Samsung S3C2410
*
* Written by Christopher Hoover <ch@hpl.hp.com>
* Based on fragments of previous driver by Russell King et al.
*
* Modified for S3C2410 from ohci-sa1111.c, ohci-omap.c and ohci-lh7a40.c
* by Ben Dooks, <ben@simtec.co.uk>
* Copyright (C) 2004 Simtec Electronics
*
* Thanks to basprog@mail.ru for updates to newer kernels
*
* This file is licenced under the GPL.
*/
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <plat/usb-control.h>
#define valid_port(idx) ((idx) == 1 || (idx) == 2)
extern void usb_host_clk_en(void);
/* clock device associated with the hcd */
static struct clk *clk;
#if defined(CONFIG_ARCH_S3C2410)
static struct clk *usb_clk;
#endif
/* forward definitions */
static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc);
/* conversion functions */
static struct s3c2410_hcd_info *to_s3c2410_info(struct usb_hcd *hcd)
{
return hcd->self.controller->platform_data;
}
static void s3c2410_start_hc(struct platform_device *dev, struct usb_hcd *hcd)
{
struct s3c2410_hcd_info *info = dev->dev.platform_data;
dev_dbg(&dev->dev, "s3c2410_start_hc:\n");
#if defined(CONFIG_ARCH_S3C2410)
clk_enable(usb_clk);
mdelay(2); /* let the bus clock stabilise */
#endif
clk_enable(clk);
if (info != NULL) {
info->hcd = hcd;
info->report_oc = s3c2410_hcd_oc;
if (info->enable_oc != NULL) {
(info->enable_oc)(info, 1);
}
}
}
static void s3c2410_stop_hc(struct platform_device *dev)
{
struct s3c2410_hcd_info *info = dev->dev.platform_data;
dev_dbg(&dev->dev, "s3c2410_stop_hc:\n");
if (info != NULL) {
info->report_oc = NULL;
info->hcd = NULL;
if (info->enable_oc != NULL) {
(info->enable_oc)(info, 0);
}
}
clk_disable(clk);
#if defined(CONFIG_ARCH_S3C2410)
clk_disable(usb_clk);
#endif
}
/* ohci_s3c2410_hub_status_data
*
* update the status data from the hub with anything that
* has been detected by our system
*/
static int
ohci_s3c2410_hub_status_data (struct usb_hcd *hcd, char *buf)
{
struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
struct s3c2410_hcd_port *port;
int orig;
int portno;
orig = ohci_hub_status_data (hcd, buf);
if (info == NULL)
return orig;
port = &info->port[0];
/* mark any changed port as changed */
for (portno = 0; portno < 2; port++, portno++) {
if (port->oc_changed == 1 &&
port->flags & S3C_HCDFLG_USED) {
dev_dbg(hcd->self.controller,
"oc change on port %d\n", portno);
if (orig < 1)
orig = 1;
buf[0] |= 1<<(portno+1);
}
}
return orig;
}
/* s3c2410_usb_set_power
*
* configure the power on a port, by calling the platform device
* routine registered with the platform device
*/
static void s3c2410_usb_set_power(struct s3c2410_hcd_info *info,
int port, int to)
{
if (info == NULL)
return;
if (info->power_control != NULL) {
info->port[port-1].power = to;
(info->power_control)(port-1, to);
}
}
/* ohci_s3c2410_hub_control
*
* look at control requests to the hub, and see if we need
* to take any action or over-ride the results from the
* request.
*/
static int ohci_s3c2410_hub_control (
struct usb_hcd *hcd,
u16 typeReq,
u16 wValue,
u16 wIndex,
char *buf,
u16 wLength)
{
struct s3c2410_hcd_info *info = to_s3c2410_info(hcd);
struct usb_hub_descriptor *desc;
int ret = -EINVAL;
u32 *data = (u32 *)buf;
dev_dbg(hcd->self.controller,
"s3c2410_hub_control(%p,0x%04x,0x%04x,0x%04x,%p,%04x)\n",
hcd, typeReq, wValue, wIndex, buf, wLength);
/* if we are only an humble host without any special capabilities
* process the request straight away and exit */
if (info == NULL) {
ret = ohci_hub_control(hcd, typeReq, wValue,
wIndex, buf, wLength);
goto out;
}
/* check the request to see if it needs handling */
switch (typeReq) {
case SetPortFeature:
if (wValue == USB_PORT_FEAT_POWER) {
dev_dbg(hcd->self.controller, "SetPortFeat: POWER\n");
s3c2410_usb_set_power(info, wIndex, 1);
goto out;
}
break;
case ClearPortFeature:
switch (wValue) {
case USB_PORT_FEAT_C_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: C_OVER_CURRENT\n");
if (valid_port(wIndex)) {
info->port[wIndex-1].oc_changed = 0;
info->port[wIndex-1].oc_status = 0;
}
goto out;
case USB_PORT_FEAT_OVER_CURRENT:
dev_dbg(hcd->self.controller,
"ClearPortFeature: OVER_CURRENT\n");
if (valid_port(wIndex)) {
info->port[wIndex-1].oc_status = 0;
}
goto out;
case USB_PORT_FEAT_POWER:
dev_dbg(hcd->self.controller,
"ClearPortFeature: POWER\n");
if (valid_port(wIndex)) {
s3c2410_usb_set_power(info, wIndex, 0);
return 0;
}
}
break;
}
ret = ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
if (ret)
goto out;
switch (typeReq) {
case GetHubDescriptor:
/* update the hub's descriptor */
desc = (struct usb_hub_descriptor *)buf;
if (info->power_control == NULL)
return ret;
dev_dbg(hcd->self.controller, "wHubCharacteristics 0x%04x\n",
desc->wHubCharacteristics);
/* remove the old configurations for power-switching, and
* over-current protection, and insert our new configuration
*/
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_LPSM);
desc->wHubCharacteristics |= cpu_to_le16(0x0001);
if (info->enable_oc) {
desc->wHubCharacteristics &= ~cpu_to_le16(HUB_CHAR_OCPM);
desc->wHubCharacteristics |= cpu_to_le16(0x0008|0x0001);
}
dev_dbg(hcd->self.controller, "wHubCharacteristics after 0x%04x\n",
desc->wHubCharacteristics);
return ret;
case GetPortStatus:
/* check port status */
dev_dbg(hcd->self.controller, "GetPortStatus(%d)\n", wIndex);
if (valid_port(wIndex)) {
if (info->port[wIndex-1].oc_changed) {
*data |= cpu_to_le32(RH_PS_OCIC);
}
if (info->port[wIndex-1].oc_status) {
*data |= cpu_to_le32(RH_PS_POCI);
}
}
}
out:
return ret;
}
/* s3c2410_hcd_oc
*
* handle an over-current report
*/
static void s3c2410_hcd_oc(struct s3c2410_hcd_info *info, int port_oc)
{
struct s3c2410_hcd_port *port;
struct usb_hcd *hcd;
unsigned long flags;
int portno;
if (info == NULL)
return;
port = &info->port[0];
hcd = info->hcd;
local_irq_save(flags);
for (portno = 0; portno < 2; port++, portno++) {
if (port_oc & (1<<portno) &&
port->flags & S3C_HCDFLG_USED) {
port->oc_status = 1;
port->oc_changed = 1;
/* ok, once over-current is detected,
the port needs to be powered down */
s3c2410_usb_set_power(info, portno+1, 0);
}
}
local_irq_restore(flags);
}
/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */
/*
* usb_hcd_s3c2410_remove - shutdown processing for HCD
* @dev: USB Host Controller being removed
* Context: !in_interrupt()
*
* Reverses the effect of usb_hcd_3c2410_probe(), first invoking
* the HCD's stop() method. It is always called from a thread
* context, normally "rmmod", "apmd", or something similar.
*
*/
static void
usb_hcd_s3c2410_remove (struct usb_hcd *hcd, struct platform_device *dev)
{
usb_remove_hcd(hcd);
s3c2410_stop_hc(dev);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
}
/**
* usb_hcd_s3c2410_probe - initialize S3C2410-based HCDs
* Context: !in_interrupt()
*
* Allocates basic resources for this USB host controller, and
* then invokes the start() method for the HCD associated with it
* through the hotplug entry's driver_data.
*
*/
static int usb_hcd_s3c2410_probe (const struct hc_driver *driver,
struct platform_device *dev)
{
struct usb_hcd *hcd = NULL;
int retval;
#if !defined(CONFIG_ARCH_S3C2410)
usb_host_clk_en();
#endif
s3c2410_usb_set_power(dev->
