+++ /dev/null
-/* Support for the OLPC DCON and OLPC EC access
- * Copyright (C) 2006, Advanced Micro Devices, Inc.
- *
- * 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/autoconf.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/mc146818rtc.h>
-#include <linux/delay.h>
-#include <linux/spinlock.h>
-
-#include <asm/olpc.h>
-#include <asm/ofw.h>
-
-/* This is our new multi-purpose structure used to contain the
- * information about the platform that we detect
- */
-
-struct olpc_platform_t olpc_platform_info;
-EXPORT_SYMBOL_GPL(olpc_platform_info);
-
-/*********************************************************************
- * EC locking and access
- *********************************************************************/
-
-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 *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: waited %u ms for IBF (%d)!\n",
- EC_BASE_TIMEOUT-timeo, line);
- }
-
- 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: waited %u ms for OBF (%d)!\n",
- EC_BASE_TIMEOUT-timeo, line);
- }
-
- return !(state == desired);
-}
-
-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);
-
- 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);
-
-/*********************************************************************
- * DCON stuff
- *********************************************************************/
-
-static void olpc_power_off(void)
-{
- printk(KERN_INFO "OLPC power off sequence...\n");
- outb(0xff, 0x381);
- outb(0x14, 0x382);
- outb(0x01, 0x383);
- outb(0xff, 0x381);
- outb(0x14, 0x382);
- outb(0x00, 0x383);
-}
-
-static void __init
-ec_detect(void)
-{
- olpc_ec_cmd(0x08, NULL, 0, (unsigned char *) &olpc_platform_info.ecver, 1);
-}
-
-/* Check to see if this version of the OLPC board has VSA built
- * in, and set a flag
- */
-
-static void __init vsa_detect(void)
-{
- u16 rev;
-
- outw(0xFC53, 0xAC1C);
- outw(0x0003, 0xAC1C);
-
- rev = inw(0xAC1E);
-
- if (rev == 0x4132)
- olpc_platform_info.flags |= OLPC_F_VSA;
-}
-
-/* Map OFW revisions to what OLPC_REV_* */
-static const char __initdata *olpc_boardrev_str[] = {
- "A1",
- "preB1",
- "B1",
- "preB2",
- "B2",
- "preB3",
- "B3",
- "B4",
- "C1",
- "R1",
-};
-
-static void __init platform_detect(char *revision, size_t len)
-{
- size_t propsize;
- int i;
-
- BUG_ON(ARRAY_SIZE(olpc_boardrev_str) != OLPC_REV_UNKNOWN);
-
- if (ofw("getprop", 4, 1, NULL, "model", revision, len, &propsize)) {
- printk(KERN_ERR "ofw: getprop call failed!\n");
- goto failed;
- }
- if (len < propsize) {
- printk(KERN_ERR "ofw: revision string is too long!\n");
- goto failed;
- }
-
- for (i=0; i < ARRAY_SIZE(olpc_boardrev_str); i++) {
- if (strcmp(revision, olpc_boardrev_str[i]) == 0) {
- olpc_platform_info.boardrev = i;
- return;
- }
- }
-
-failed:
- strncpy(revision, "Unknown", len);
- olpc_platform_info.boardrev = OLPC_REV_UNKNOWN;
-}
-
-static int olpc_dcon_present = -1;
-module_param(olpc_dcon_present, int, 0444);
-
-/* REV_A CMOS map:
- * bit 440; DCON present bit
- */
-
-#define OLPC_CMOS_DCON_OFFSET (440 / 8)
-#define OLPC_CMOS_DCON_MASK 0x01
-
-static int __init olpc_init(void)
-{
- unsigned char *romsig;
- char revision[10];
-
- 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;
-
- pm_power_off = olpc_power_off;
-
- /* Get the platform revision */
- platform_detect(revision, sizeof(revision));
-
- /* If olpc_dcon_present isn't set by the command line, then
- * "detect" it
- */
-
- if (olpc_dcon_present == -1) {
- /* B1 and greater always has a DCON */
- if (olpc_platform_info.boardrev >= OLPC_REV_B1 &&
- olpc_platform_info.boardrev < OLPC_REV_UNKNOWN)
- olpc_dcon_present = 1;
- }
-
- if (olpc_dcon_present)
- olpc_platform_info.flags |= OLPC_F_DCON;
-
- /* Get the EC revision */
- ec_detect();
-
- /* Check to see if the VSA exists */
- vsa_detect();
-
- printk(KERN_INFO "OLPC board revision: %s (EC=%x)\n", revision,
- olpc_platform_info.ecver);
-
- unmap:
- iounmap(romsig);
-
- return 0;
-}
-
-postcore_initcall(olpc_init);
projects / openwrt.git / blobdiff