mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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f39cd04251
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10060 3c298f89-4303-0410-b956-a3cf2f4a3e73
321 lines
7.3 KiB
C
321 lines
7.3 KiB
C
/* Support for the OLPC DCON and OLPC EC access
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* Copyright (C) 2006, Advanced Micro Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/autoconf.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/mc146818rtc.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <asm/olpc.h>
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#include <asm/ofw.h>
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/* This is our new multi-purpose structure used to contain the
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* information about the platform that we detect
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*/
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struct olpc_platform_t olpc_platform_info;
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EXPORT_SYMBOL_GPL(olpc_platform_info);
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/*********************************************************************
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* EC locking and access
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*********************************************************************/
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static DEFINE_SPINLOCK(ec_lock);
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/* what the timeout *should* be (in ms) */
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#define EC_BASE_TIMEOUT 20
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/* the timeout that bugs in the EC might force us to actually use */
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static int ec_timeout = EC_BASE_TIMEOUT;
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static int __init olpc_ec_timeout_set(char *str)
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{
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if (get_option(&str, &ec_timeout) != 1) {
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ec_timeout = EC_BASE_TIMEOUT;
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printk(KERN_ERR "olpc-ec: invalid argument to "
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"'olpc_ec_timeout=', ignoring!\n");
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}
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printk(KERN_DEBUG "olpc-ec: using %d ms delay for EC commands.\n",
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ec_timeout);
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return 1;
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}
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__setup("olpc_ec_timeout=", olpc_ec_timeout_set);
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/*
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* These *bf_status functions return whether the buffers are full or not.
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*/
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static inline unsigned int ibf_status(unsigned int port)
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{
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return inb(port) & 0x02;
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}
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static inline unsigned int obf_status(unsigned int port)
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{
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return inb(port) & 0x01;
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}
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#define wait_on_ibf(p, d) __wait_on_ibf(__LINE__, (p), (d))
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static int __wait_on_ibf(unsigned int line, unsigned int port, int desired)
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{
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unsigned int timeo;
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int state = ibf_status(port);
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for (timeo = ec_timeout; state != desired && timeo; timeo--) {
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mdelay(1);
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state = ibf_status(port);
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}
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if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
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timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
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printk(KERN_WARNING "olpc-ec: waited %u ms for IBF (%d)!\n",
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EC_BASE_TIMEOUT-timeo, line);
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}
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return !(state == desired);
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}
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#define wait_on_obf(p, d) __wait_on_obf(__LINE__, (p), (d))
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static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
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{
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unsigned int timeo;
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int state = obf_status(port);
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for (timeo = ec_timeout; state != desired && timeo; timeo--) {
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mdelay(1);
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state = obf_status(port);
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}
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if ((state == desired) && (ec_timeout > EC_BASE_TIMEOUT) &&
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timeo < (ec_timeout - EC_BASE_TIMEOUT)) {
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printk(KERN_WARNING "olpc-ec: waited %u ms for OBF (%d)!\n",
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EC_BASE_TIMEOUT-timeo, line);
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}
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return !(state == desired);
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}
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int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
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unsigned char *outbuf, size_t outlen)
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{
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unsigned long flags;
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int ret = -EIO;
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int i;
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spin_lock_irqsave(&ec_lock, flags);
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if (wait_on_ibf(0x6c, 0)) {
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printk(KERN_ERR "olpc-ec: timeout waiting for EC to "
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"quiesce!\n");
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goto err;
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}
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restart:
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/*
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* Note that if we time out during any IBF checks, that's a failure;
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* we have to return. There's no way for the kernel to clear that.
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*
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* If we time out during an OBF check, we can restart the command;
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* reissuing it will clear the OBF flag, and we should be alright.
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* The OBF flag will sometimes misbehave due to what we believe
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* is a hardware quirk..
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*/
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printk(KERN_DEBUG "olpc-ec: running cmd 0x%x\n", cmd);
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outb(cmd, 0x6c);
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if (wait_on_ibf(0x6c, 0)) {
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printk(KERN_ERR "olpc-ec: timeout waiting for EC to read "
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"command!\n");
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goto err;
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}
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if (inbuf && inlen) {
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/* write data to EC */
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for (i = 0; i < inlen; i++) {
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if (wait_on_ibf(0x6c, 0)) {
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printk(KERN_ERR "olpc-ec: timeout waiting for"
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" EC accept data!\n");
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goto err;
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}
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printk(KERN_DEBUG "olpc-ec: sending cmd arg 0x%x\n",
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inbuf[i]);
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outb(inbuf[i], 0x68);
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}
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}
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if (outbuf && outlen) {
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/* read data from EC */
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for (i = 0; i < outlen; i++) {
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if (wait_on_obf(0x6c, 1)) {
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printk(KERN_ERR "olpc-ec: timeout waiting for"
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" EC to provide data!\n");
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goto restart;
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}
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outbuf[i] = inb(0x68);
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printk(KERN_DEBUG "olpc-ec: received 0x%x\n",
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outbuf[i]);
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}
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}
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ret = 0;
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err:
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spin_unlock_irqrestore(&ec_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL_GPL(olpc_ec_cmd);
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/*********************************************************************
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* DCON stuff
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*********************************************************************/
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static void olpc_power_off(void)
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{
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printk(KERN_INFO "OLPC power off sequence...\n");
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outb(0xff, 0x381);
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outb(0x14, 0x382);
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outb(0x01, 0x383);
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outb(0xff, 0x381);
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outb(0x14, 0x382);
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outb(0x00, 0x383);
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}
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static void __init
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ec_detect(void)
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{
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olpc_ec_cmd(0x08, NULL, 0, (unsigned char *) &olpc_platform_info.ecver, 1);
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}
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/* Check to see if this version of the OLPC board has VSA built
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* in, and set a flag
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*/
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static void __init vsa_detect(void)
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{
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u16 rev;
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outw(0xFC53, 0xAC1C);
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outw(0x0003, 0xAC1C);
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rev = inw(0xAC1E);
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if (rev == 0x4132)
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olpc_platform_info.flags |= OLPC_F_VSA;
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}
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/* Map OFW revisions to what OLPC_REV_* */
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static const char __initdata *olpc_boardrev_str[] = {
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"A1",
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"preB1",
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"B1",
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"preB2",
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"B2",
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"preB3",
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"B3",
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"B4",
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"C1",
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"R1",
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};
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static void __init platform_detect(char *revision, size_t len)
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{
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size_t propsize;
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int i;
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BUG_ON(ARRAY_SIZE(olpc_boardrev_str) != OLPC_REV_UNKNOWN);
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if (ofw("getprop", 4, 1, NULL, "model", revision, len, &propsize)) {
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printk(KERN_ERR "ofw: getprop call failed!\n");
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goto failed;
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}
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if (len < propsize) {
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printk(KERN_ERR "ofw: revision string is too long!\n");
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goto failed;
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}
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for (i=0; i < ARRAY_SIZE(olpc_boardrev_str); i++) {
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if (strcmp(revision, olpc_boardrev_str[i]) == 0) {
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olpc_platform_info.boardrev = i;
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return;
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}
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}
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failed:
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strncpy(revision, "Unknown", len);
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olpc_platform_info.boardrev = OLPC_REV_UNKNOWN;
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}
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static int olpc_dcon_present = -1;
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module_param(olpc_dcon_present, int, 0444);
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/* REV_A CMOS map:
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* bit 440; DCON present bit
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*/
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#define OLPC_CMOS_DCON_OFFSET (440 / 8)
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#define OLPC_CMOS_DCON_MASK 0x01
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static int __init olpc_init(void)
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{
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unsigned char *romsig;
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char revision[10];
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spin_lock_init(&ec_lock);
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romsig = ioremap(0xffffffc0, 16);
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if (!romsig)
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return 0;
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if (strncmp(romsig, "CL1 Q", 7))
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goto unmap;
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if (strncmp(romsig+6, romsig+13, 3)) {
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printk(KERN_INFO "OLPC BIOS signature looks invalid. Assuming not OLPC\n");
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goto unmap;
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}
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printk(KERN_INFO "OLPC board with OpenFirmware: %.16s\n", romsig);
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olpc_platform_info.flags |= OLPC_F_PRESENT;
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pm_power_off = olpc_power_off;
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/* Get the platform revision */
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platform_detect(revision, sizeof(revision));
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/* If olpc_dcon_present isn't set by the command line, then
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* "detect" it
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*/
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if (olpc_dcon_present == -1) {
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/* B1 and greater always has a DCON */
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if (olpc_platform_info.boardrev >= OLPC_REV_B1 &&
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olpc_platform_info.boardrev < OLPC_REV_UNKNOWN)
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olpc_dcon_present = 1;
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}
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if (olpc_dcon_present)
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olpc_platform_info.flags |= OLPC_F_DCON;
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/* Get the EC revision */
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ec_detect();
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/* Check to see if the VSA exists */
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vsa_detect();
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printk(KERN_INFO "OLPC board revision: %s (EC=%x)\n", revision,
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olpc_platform_info.ecver);
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unmap:
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iounmap(romsig);
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return 0;
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}
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postcore_initcall(olpc_init);
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