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Diffstat (limited to 'arch/x86/kernel/olpc.c')
-rw-r--r--arch/x86/kernel/olpc.c260
1 files changed, 0 insertions, 260 deletions
diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c
deleted file mode 100644
index 9d1d263f786..00000000000
--- a/arch/x86/kernel/olpc.c
+++ /dev/null
@@ -1,260 +0,0 @@
-/*
- * 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() || cs5535_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 (cs5535_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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:06:47 +0000