mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 03:46:38 +07:00
e49590b6dd
Impact: fix "garbled display, laptop is unusable" bug
Commit e51a1ac2df ("x86, olpc: fix endian
bug in openfirmware workaround") breaks model comparison on OLPC; the value
0xc2 needs to be scaled up by olpc_board().
The pre-patch version was wrong, but accidentally worked anyway
(big-endian 0xc2 is big enough to satisfy all other board revisions,
but little endian 0xc2 is not).
Signed-off-by: Chris Ball <cjb@laptop.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Andres Salomon <dilinger@queued.net>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
261 lines
6.5 KiB
C
261 lines
6.5 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/spinlock.h>
|
|
#include <linux/io.h>
|
|
#include <linux/string.h>
|
|
#include <asm/geode.h>
|
|
#include <asm/olpc.h>
|
|
|
|
#ifdef CONFIG_OPEN_FIRMWARE
|
|
#include <asm/ofw.h>
|
|
#endif
|
|
|
|
struct olpc_platform_t olpc_platform_info;
|
|
EXPORT_SYMBOL_GPL(olpc_platform_info);
|
|
|
|
static DEFINE_SPINLOCK(ec_lock);
|
|
|
|
/* 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.
|
|
*/
|
|
int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
|
|
unsigned char *outbuf, size_t outlen)
|
|
{
|
|
unsigned long flags;
|
|
int ret = -EIO;
|
|
int i;
|
|
|
|
spin_lock_irqsave(&ec_lock, flags);
|
|
|
|
/* 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..
|
|
*/
|
|
printk(KERN_DEBUG "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++) {
|
|
if (wait_on_ibf(0x6c, 0)) {
|
|
printk(KERN_ERR "olpc-ec: timeout waiting for"
|
|
" EC accept data!\n");
|
|
goto err;
|
|
}
|
|
printk(KERN_DEBUG "olpc-ec: sending cmd arg 0x%x\n",
|
|
inbuf[i]);
|
|
outb(inbuf[i], 0x68);
|
|
}
|
|
}
|
|
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");
|
|
goto restart;
|
|
}
|
|
outbuf[i] = inb(0x68);
|
|
printk(KERN_DEBUG "olpc-ec: received 0x%x\n",
|
|
outbuf[i]);
|
|
}
|
|
}
|
|
|
|
ret = 0;
|
|
err:
|
|
spin_unlock_irqrestore(&ec_lock, flags);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(olpc_ec_cmd);
|
|
|
|
#ifdef CONFIG_OPEN_FIRMWARE
|
|
static void __init platform_detect(void)
|
|
{
|
|
size_t propsize;
|
|
__be32 rev;
|
|
|
|
if (ofw("getprop", 4, 1, NULL, "board-revision-int", &rev, 4,
|
|
&propsize) || propsize != 4) {
|
|
printk(KERN_ERR "ofw: getprop call failed!\n");
|
|
rev = cpu_to_be32(0);
|
|
}
|
|
olpc_platform_info.boardrev = be32_to_cpu(rev);
|
|
}
|
|
#else
|
|
static void __init platform_detect(void)
|
|
{
|
|
/* stopgap until OFW support is added to the kernel */
|
|
olpc_platform_info.boardrev = olpc_board(0xc2);
|
|
}
|
|
#endif
|
|
|
|
static int __init olpc_init(void)
|
|
{
|
|
unsigned char *romsig;
|
|
|
|
/* The ioremap check is dangerous; limit what we run it on */
|
|
if (!is_geode() || geode_has_vsa2())
|
|
return 0;
|
|
|
|
spin_lock_init(&ec_lock);
|
|
|
|
romsig = ioremap(0xffffffc0, 16);
|
|
if (!romsig)
|
|
return 0;
|
|
|
|
if (strncmp(romsig, "CL1 Q", 7))
|
|
goto unmap;
|
|
if (strncmp(romsig+6, romsig+13, 3)) {
|
|
printk(KERN_INFO "OLPC BIOS signature looks invalid. "
|
|
"Assuming not OLPC\n");
|
|
goto unmap;
|
|
}
|
|
|
|
printk(KERN_INFO "OLPC board with OpenFirmware %.16s\n", romsig);
|
|
olpc_platform_info.flags |= OLPC_F_PRESENT;
|
|
|
|
/* get the platform revision */
|
|
platform_detect();
|
|
|
|
/* assume B1 and above models always have a DCON */
|
|
if (olpc_board_at_least(olpc_board(0xb1)))
|
|
olpc_platform_info.flags |= OLPC_F_DCON;
|
|
|
|
/* get the EC revision */
|
|
olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
|
|
(unsigned char *) &olpc_platform_info.ecver, 1);
|
|
|
|
/* check to see if the VSA exists */
|
|
if (geode_has_vsa2())
|
|
olpc_platform_info.flags |= OLPC_F_VSA;
|
|
|
|
printk(KERN_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);
|
|
|
|
unmap:
|
|
iounmap(romsig);
|
|
return 0;
|
|
}
|
|
|
|
postcore_initcall(olpc_init);
|