diff options
Diffstat (limited to 'target/linux/olpc/files-2.6.23/arch/i386/kernel/olpc.c')
| -rw-r--r-- | target/linux/olpc/files-2.6.23/arch/i386/kernel/olpc.c | 320 |
1 files changed, 0 insertions, 320 deletions
diff --git a/target/linux/olpc/files-2.6.23/arch/i386/kernel/olpc.c b/target/linux/olpc/files-2.6.23/arch/i386/kernel/olpc.c deleted file mode 100644 index d540cb0ea..000000000 --- a/target/linux/olpc/files-2.6.23/arch/i386/kernel/olpc.c +++ /dev/null @@ -1,320 +0,0 @@ -/* 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); |