1fcfd08bd0
The new EC driver calls platform-specific suspend and resume hooks; run XO-1-specific EC commands from there, rather than deep in s/r code. If we attempt to run EC commands after the new EC driver has suspended, it is refused by the ec->suspended checks. Signed-off-by: Andres Salomon <dilinger@queued.net> Acked-by: Paul Fox <pgf@laptop.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
410 lines
9.9 KiB
C
410 lines
9.9 KiB
C
/*
|
|
* Support for the OLPC DCON and OLPC EC access
|
|
*
|
|
* Copyright © 2006 Advanced Micro Devices, Inc.
|
|
* Copyright © 2007-2008 Andres Salomon <dilinger@debian.org>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/string.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/of.h>
|
|
#include <linux/syscore_ops.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/olpc-ec.h>
|
|
|
|
#include <asm/geode.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/olpc.h>
|
|
#include <asm/olpc_ofw.h>
|
|
|
|
struct olpc_platform_t olpc_platform_info;
|
|
EXPORT_SYMBOL_GPL(olpc_platform_info);
|
|
|
|
/* EC event mask to be applied during suspend (defining wakeup sources). */
|
|
static u16 ec_wakeup_mask;
|
|
|
|
/* what the timeout *should* be (in ms) */
|
|
#define EC_BASE_TIMEOUT 20
|
|
|
|
/* the timeout that bugs in the EC might force us to actually use */
|
|
static int ec_timeout = EC_BASE_TIMEOUT;
|
|
|
|
static int __init olpc_ec_timeout_set(char *str)
|
|
{
|
|
if (get_option(&str, &ec_timeout) != 1) {
|
|
ec_timeout = EC_BASE_TIMEOUT;
|
|
printk(KERN_ERR "olpc-ec: invalid argument to "
|
|
"'olpc_ec_timeout=', ignoring!\n");
|
|
}
|
|
printk(KERN_DEBUG "olpc-ec: using %d ms delay for EC commands.\n",
|
|
ec_timeout);
|
|
return 1;
|
|
}
|
|
__setup("olpc_ec_timeout=", olpc_ec_timeout_set);
|
|
|
|
/*
|
|
* These {i,o}bf_status functions return whether the buffers are full or not.
|
|
*/
|
|
|
|
static inline unsigned int ibf_status(unsigned int port)
|
|
{
|
|
return !!(inb(port) & 0x02);
|
|
}
|
|
|
|
static inline unsigned int obf_status(unsigned int port)
|
|
{
|
|
return inb(port) & 0x01;
|
|
}
|
|
|
|
#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d))
|
|
static int __wait_on_ibf(unsigned int line, unsigned int port, int desired)
|
|
{
|
|
unsigned int timeo;
|
|
int state = ibf_status(port);
|
|
|
|
for (timeo = ec_timeout; state != desired && timeo; timeo--) {
|
|
mdelay(1);
|
|
state = ibf_status(port);
|
|
}
|
|
|
|
if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
|
|
timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
|
|
printk(KERN_WARNING "olpc-ec: %d: waited %u ms for IBF!\n",
|
|
line, ec_timeout - timeo);
|
|
}
|
|
|
|
return !(state == desired);
|
|
}
|
|
|
|
#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d))
|
|
static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
|
|
{
|
|
unsigned int timeo;
|
|
int state = obf_status(port);
|
|
|
|
for (timeo = ec_timeout; state != desired && timeo; timeo--) {
|
|
mdelay(1);
|
|
state = obf_status(port);
|
|
}
|
|
|
|
if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
|
|
timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
|
|
printk(KERN_WARNING "olpc-ec: %d: waited %u ms for OBF!\n",
|
|
line, ec_timeout - timeo);
|
|
}
|
|
|
|
return !(state == desired);
|
|
}
|
|
|
|
/*
|
|
* This allows the kernel to run Embedded Controller commands. The EC is
|
|
* documented at <http://wiki.laptop.org/go/Embedded_controller>, and the
|
|
* available EC commands are here:
|
|
* <http://wiki.laptop.org/go/Ec_specification>. Unfortunately, while
|
|
* OpenFirmware's source is available, the EC's is not.
|
|
*/
|
|
static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
|
|
size_t outlen, void *arg)
|
|
{
|
|
int ret = -EIO;
|
|
int i;
|
|
int restarts = 0;
|
|
|
|
/* Clear OBF */
|
|
for (i = 0; i < 10 && (obf_status(0x6c) == 1); i++)
|
|
inb(0x68);
|
|
if (i == 10) {
|
|
printk(KERN_ERR "olpc-ec: timeout while attempting to "
|
|
"clear OBF flag!\n");
|
|
goto err;
|
|
}
|
|
|
|
if (wait_on_ibf(0x6c, 0)) {
|
|
printk(KERN_ERR "olpc-ec: timeout waiting for EC to "
|
|
"quiesce!\n");
|
|
goto err;
|
|
}
|
|
|
|
restart:
|
|
/*
|
|
* Note that if we time out during any IBF checks, that's a failure;
|
|
* we have to return. There's no way for the kernel to clear that.
|
|
*
|
|
* If we time out during an OBF check, we can restart the command;
|
|
* reissuing it will clear the OBF flag, and we should be alright.
|
|
* The OBF flag will sometimes misbehave due to what we believe
|
|
* is a hardware quirk..
|
|
*/
|
|
pr_devel("olpc-ec: running cmd 0x%x\n", cmd);
|
|
outb(cmd, 0x6c);
|
|
|
|
if (wait_on_ibf(0x6c, 0)) {
|
|
printk(KERN_ERR "olpc-ec: timeout waiting for EC to read "
|
|
"command!\n");
|
|
goto err;
|
|
}
|
|
|
|
if (inbuf && inlen) {
|
|
/* write data to EC */
|
|
for (i = 0; i < inlen; i++) {
|
|
pr_devel("olpc-ec: sending cmd arg 0x%x\n", inbuf[i]);
|
|
outb(inbuf[i], 0x68);
|
|
if (wait_on_ibf(0x6c, 0)) {
|
|
printk(KERN_ERR "olpc-ec: timeout waiting for"
|
|
" EC accept data!\n");
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
if (outbuf && outlen) {
|
|
/* read data from EC */
|
|
for (i = 0; i < outlen; i++) {
|
|
if (wait_on_obf(0x6c, 1)) {
|
|
printk(KERN_ERR "olpc-ec: timeout waiting for"
|
|
" EC to provide data!\n");
|
|
if (restarts++ < 10)
|
|
goto restart;
|
|
goto err;
|
|
}
|
|
outbuf[i] = inb(0x68);
|
|
pr_devel("olpc-ec: received 0x%x\n", outbuf[i]);
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
void olpc_ec_wakeup_set(u16 value)
|
|
{
|
|
ec_wakeup_mask |= value;
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
|
|
|
|
void olpc_ec_wakeup_clear(u16 value)
|
|
{
|
|
ec_wakeup_mask &= ~value;
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
|
|
|
|
/*
|
|
* Returns true if the compile and runtime configurations allow for EC events
|
|
* to wake the system.
|
|
*/
|
|
bool olpc_ec_wakeup_available(void)
|
|
{
|
|
if (!machine_is_olpc())
|
|
return false;
|
|
|
|
/*
|
|
* XO-1 EC wakeups are available when olpc-xo1-sci driver is
|
|
* compiled in
|
|
*/
|
|
#ifdef CONFIG_OLPC_XO1_SCI
|
|
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
|
|
return true;
|
|
#endif
|
|
|
|
/*
|
|
* XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
|
|
* compiled in
|
|
*/
|
|
#ifdef CONFIG_OLPC_XO15_SCI
|
|
if (olpc_platform_info.boardrev >= olpc_board_pre(0xd0)) /* XO-1.5 */
|
|
return true;
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
|
|
|
|
int olpc_ec_mask_write(u16 bits)
|
|
{
|
|
if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
|
|
__be16 ec_word = cpu_to_be16(bits);
|
|
return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2,
|
|
NULL, 0);
|
|
} else {
|
|
unsigned char ec_byte = bits & 0xff;
|
|
return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
|
|
|
|
int olpc_ec_sci_query(u16 *sci_value)
|
|
{
|
|
int ret;
|
|
|
|
if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
|
|
__be16 ec_word;
|
|
ret = olpc_ec_cmd(EC_EXT_SCI_QUERY,
|
|
NULL, 0, (void *) &ec_word, 2);
|
|
if (ret == 0)
|
|
*sci_value = be16_to_cpu(ec_word);
|
|
} else {
|
|
unsigned char ec_byte;
|
|
ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
|
|
if (ret == 0)
|
|
*sci_value = ec_byte;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
|
|
|
|
static bool __init check_ofw_architecture(struct device_node *root)
|
|
{
|
|
const char *olpc_arch;
|
|
int propsize;
|
|
|
|
olpc_arch = of_get_property(root, "architecture", &propsize);
|
|
return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
|
|
}
|
|
|
|
static u32 __init get_board_revision(struct device_node *root)
|
|
{
|
|
int propsize;
|
|
const __be32 *rev;
|
|
|
|
rev = of_get_property(root, "board-revision-int", &propsize);
|
|
if (propsize != 4)
|
|
return 0;
|
|
|
|
return be32_to_cpu(*rev);
|
|
}
|
|
|
|
static bool __init platform_detect(void)
|
|
{
|
|
struct device_node *root = of_find_node_by_path("/");
|
|
bool success;
|
|
|
|
if (!root)
|
|
return false;
|
|
|
|
success = check_ofw_architecture(root);
|
|
if (success) {
|
|
olpc_platform_info.boardrev = get_board_revision(root);
|
|
olpc_platform_info.flags |= OLPC_F_PRESENT;
|
|
}
|
|
|
|
of_node_put(root);
|
|
return success;
|
|
}
|
|
|
|
static int __init add_xo1_platform_devices(void)
|
|
{
|
|
struct platform_device *pdev;
|
|
|
|
pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0);
|
|
if (IS_ERR(pdev))
|
|
return PTR_ERR(pdev);
|
|
|
|
pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0);
|
|
if (IS_ERR(pdev))
|
|
return PTR_ERR(pdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int olpc_xo1_ec_probe(struct platform_device *pdev)
|
|
{
|
|
/* get the EC revision */
|
|
olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
|
|
(unsigned char *) &olpc_platform_info.ecver, 1);
|
|
|
|
/* EC version 0x5f adds support for wide SCI mask */
|
|
if (olpc_platform_info.ecver >= 0x5f)
|
|
olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
|
|
|
|
pr_info("OLPC board revision %s%X (EC=%x)\n",
|
|
((olpc_platform_info.boardrev & 0xf) < 8) ? "pre" : "",
|
|
olpc_platform_info.boardrev >> 4,
|
|
olpc_platform_info.ecver);
|
|
|
|
return 0;
|
|
}
|
|
static int olpc_xo1_ec_suspend(struct platform_device *pdev)
|
|
{
|
|
olpc_ec_mask_write(ec_wakeup_mask);
|
|
|
|
/*
|
|
* Squelch SCIs while suspended. This is a fix for
|
|
* <http://dev.laptop.org/ticket/1835>.
|
|
*/
|
|
return olpc_ec_cmd(EC_SET_SCI_INHIBIT, NULL, 0, NULL, 0);
|
|
}
|
|
|
|
static int olpc_xo1_ec_resume(struct platform_device *pdev)
|
|
{
|
|
/* Tell the EC to stop inhibiting SCIs */
|
|
olpc_ec_cmd(EC_SET_SCI_INHIBIT_RELEASE, NULL, 0, NULL, 0);
|
|
|
|
/*
|
|
* Tell the wireless module to restart USB communication.
|
|
* Must be done twice.
|
|
*/
|
|
olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
|
|
olpc_ec_cmd(EC_WAKE_UP_WLAN, NULL, 0, NULL, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct olpc_ec_driver ec_xo1_driver = {
|
|
.probe = olpc_xo1_ec_probe,
|
|
.suspend = olpc_xo1_ec_suspend,
|
|
.resume = olpc_xo1_ec_resume,
|
|
.ec_cmd = olpc_xo1_ec_cmd,
|
|
};
|
|
|
|
static struct olpc_ec_driver ec_xo1_5_driver = {
|
|
.probe = olpc_xo1_ec_probe,
|
|
.ec_cmd = olpc_xo1_ec_cmd,
|
|
};
|
|
|
|
static int __init olpc_init(void)
|
|
{
|
|
int r = 0;
|
|
|
|
if (!olpc_ofw_present() || !platform_detect())
|
|
return 0;
|
|
|
|
/* register the XO-1 and 1.5-specific EC handler */
|
|
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
|
|
olpc_ec_driver_register(&ec_xo1_driver, NULL);
|
|
else
|
|
olpc_ec_driver_register(&ec_xo1_5_driver, NULL);
|
|
platform_device_register_simple("olpc-ec", -1, NULL, 0);
|
|
|
|
/* assume B1 and above models always have a DCON */
|
|
if (olpc_board_at_least(olpc_board(0xb1)))
|
|
olpc_platform_info.flags |= OLPC_F_DCON;
|
|
|
|
#ifdef CONFIG_PCI_OLPC
|
|
/* If the VSA exists let it emulate PCI, if not emulate in kernel.
|
|
* XO-1 only. */
|
|
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) &&
|
|
!cs5535_has_vsa2())
|
|
x86_init.pci.arch_init = pci_olpc_init;
|
|
#endif
|
|
|
|
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */
|
|
r = add_xo1_platform_devices();
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
postcore_initcall(olpc_init);
|