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Diffstat (limited to 'arch/x86/platform/olpc/olpc.c')
-rw-r--r--arch/x86/platform/olpc/olpc.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
new file mode 100644
index 00000000..a4bee53c
--- /dev/null
+++ b/arch/x86/platform/olpc/olpc.c
@@ -0,0 +1,476 @@
+/*
+ * 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 <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/syscore_ops.h>
+#include <linux/debugfs.h>
+#include <linux/mutex.h>
+
+#include <asm/geode.h>
+#include <asm/setup.h>
+#include <asm/olpc.h>
+#include <asm/olpc_ofw.h>
+
+struct olpc_platform_t olpc_platform_info;
+EXPORT_SYMBOL_GPL(olpc_platform_info);
+
+static DEFINE_SPINLOCK(ec_lock);
+
+/* debugfs interface to EC commands */
+#define EC_MAX_CMD_ARGS (5 + 1) /* cmd byte + 5 args */
+#define EC_MAX_CMD_REPLY (8)
+
+static struct dentry *ec_debugfs_dir;
+static DEFINE_MUTEX(ec_debugfs_cmd_lock);
+static unsigned char ec_debugfs_resp[EC_MAX_CMD_REPLY];
+static unsigned int ec_debugfs_resp_bytes;
+
+/* EC event mask to be applied during suspend (defining wakeup sources). */
+static u16 ec_wakeup_mask;
+
+/* 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;
+ int restarts = 0;
+
+ 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..
+ */
+ pr_devel("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++) {
+ pr_devel("olpc-ec: sending cmd arg 0x%x\n", inbuf[i]);
+ outb(inbuf[i], 0x68);
+ if (wait_on_ibf(0x6c, 0)) {
+ printk(KERN_ERR "olpc-ec: timeout waiting for"
+ " EC accept data!\n");
+ goto err;
+ }
+ }
+ }
+ 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");
+ if (restarts++ < 10)
+ goto restart;
+ goto err;
+ }
+ outbuf[i] = inb(0x68);
+ pr_devel("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);
+
+void olpc_ec_wakeup_set(u16 value)
+{
+ ec_wakeup_mask |= value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_set);
+
+void olpc_ec_wakeup_clear(u16 value)
+{
+ ec_wakeup_mask &= ~value;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_clear);
+
+/*
+ * Returns true if the compile and runtime configurations allow for EC events
+ * to wake the system.
+ */
+bool olpc_ec_wakeup_available(void)
+{
+ if (!machine_is_olpc())
+ return false;
+
+ /*
+ * XO-1 EC wakeups are available when olpc-xo1-sci driver is
+ * compiled in
+ */
+#ifdef CONFIG_OLPC_XO1_SCI
+ if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) /* XO-1 */
+ return true;
+#endif
+
+ /*
+ * XO-1.5 EC wakeups are available when olpc-xo15-sci driver is
+ * compiled in
+ */
+#ifdef CONFIG_OLPC_XO15_SCI
+ if (olpc_platform_info.boardrev >= olpc_board_pre(0xd0)) /* XO-1.5 */
+ return true;
+#endif
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_wakeup_available);
+
+int olpc_ec_mask_write(u16 bits)
+{
+ if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+ __be16 ec_word = cpu_to_be16(bits);
+ return olpc_ec_cmd(EC_WRITE_EXT_SCI_MASK, (void *) &ec_word, 2,
+ NULL, 0);
+ } else {
+ unsigned char ec_byte = bits & 0xff;
+ return olpc_ec_cmd(EC_WRITE_SCI_MASK, &ec_byte, 1, NULL, 0);
+ }
+}
+EXPORT_SYMBOL_GPL(olpc_ec_mask_write);
+
+int olpc_ec_sci_query(u16 *sci_value)
+{
+ int ret;
+
+ if (olpc_platform_info.flags & OLPC_F_EC_WIDE_SCI) {
+ __be16 ec_word;
+ ret = olpc_ec_cmd(EC_EXT_SCI_QUERY,
+ NULL, 0, (void *) &ec_word, 2);
+ if (ret == 0)
+ *sci_value = be16_to_cpu(ec_word);
+ } else {
+ unsigned char ec_byte;
+ ret = olpc_ec_cmd(EC_SCI_QUERY, NULL, 0, &ec_byte, 1);
+ if (ret == 0)
+ *sci_value = ec_byte;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(olpc_ec_sci_query);
+
+static ssize_t ec_debugfs_cmd_write(struct file *file, const char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ int i, m;
+ unsigned char ec_cmd[EC_MAX_CMD_ARGS];
+ unsigned int ec_cmd_int[EC_MAX_CMD_ARGS];
+ char cmdbuf[64];
+ int ec_cmd_bytes;
+
+ mutex_lock(&ec_debugfs_cmd_lock);
+
+ size = simple_write_to_buffer(cmdbuf, sizeof(cmdbuf), ppos, buf, size);
+
+ m = sscanf(cmdbuf, "%x:%u %x %x %x %x %x", &ec_cmd_int[0],
+ &ec_debugfs_resp_bytes,
+ &ec_cmd_int[1], &ec_cmd_int[2], &ec_cmd_int[3],
+ &ec_cmd_int[4], &ec_cmd_int[5]);
+ if (m < 2 || ec_debugfs_resp_bytes > EC_MAX_CMD_REPLY) {
+ /* reset to prevent overflow on read */
+ ec_debugfs_resp_bytes = 0;
+
+ printk(KERN_DEBUG "olpc-ec: bad ec cmd: "
+ "cmd:response-count [arg1 [arg2 ...]]\n");
+ size = -EINVAL;
+ goto out;
+ }
+
+ /* convert scanf'd ints to char */
+ ec_cmd_bytes = m - 2;
+ for (i = 0; i <= ec_cmd_bytes; i++)
+ ec_cmd[i] = ec_cmd_int[i];
+
+ printk(KERN_DEBUG "olpc-ec: debugfs cmd 0x%02x with %d args "
+ "%02x %02x %02x %02x %02x, want %d returns\n",
+ ec_cmd[0], ec_cmd_bytes, ec_cmd[1], ec_cmd[2], ec_cmd[3],
+ ec_cmd[4], ec_cmd[5], ec_debugfs_resp_bytes);
+
+ olpc_ec_cmd(ec_cmd[0], (ec_cmd_bytes == 0) ? NULL : &ec_cmd[1],
+ ec_cmd_bytes, ec_debugfs_resp, ec_debugfs_resp_bytes);
+
+ printk(KERN_DEBUG "olpc-ec: response "
+ "%02x %02x %02x %02x %02x %02x %02x %02x (%d bytes expected)\n",
+ ec_debugfs_resp[0], ec_debugfs_resp[1], ec_debugfs_resp[2],
+ ec_debugfs_resp[3], ec_debugfs_resp[4], ec_debugfs_resp[5],
+ ec_debugfs_resp[6], ec_debugfs_resp[7], ec_debugfs_resp_bytes);
+
+out:
+ mutex_unlock(&ec_debugfs_cmd_lock);
+ return size;
+}
+
+static ssize_t ec_debugfs_cmd_read(struct file *file, char __user *buf,
+ size_t size, loff_t *ppos)
+{
+ unsigned int i, r;
+ char *rp;
+ char respbuf[64];
+
+ mutex_lock(&ec_debugfs_cmd_lock);
+ rp = respbuf;
+ rp += sprintf(rp, "%02x", ec_debugfs_resp[0]);
+ for (i = 1; i < ec_debugfs_resp_bytes; i++)
+ rp += sprintf(rp, ", %02x", ec_debugfs_resp[i]);
+ mutex_unlock(&ec_debugfs_cmd_lock);
+ rp += sprintf(rp, "\n");
+
+ r = rp - respbuf;
+ return simple_read_from_buffer(buf, size, ppos, respbuf, r);
+}
+
+static const struct file_operations ec_debugfs_genops = {
+ .write = ec_debugfs_cmd_write,
+ .read = ec_debugfs_cmd_read,
+};
+
+static void setup_debugfs(void)
+{
+ ec_debugfs_dir = debugfs_create_dir("olpc-ec", 0);
+ if (ec_debugfs_dir == ERR_PTR(-ENODEV))
+ return;
+
+ debugfs_create_file("cmd", 0600, ec_debugfs_dir, NULL,
+ &ec_debugfs_genops);
+}
+
+static int olpc_ec_suspend(void)
+{
+ return olpc_ec_mask_write(ec_wakeup_mask);
+}
+
+static bool __init check_ofw_architecture(struct device_node *root)
+{
+ const char *olpc_arch;
+ int propsize;
+
+ olpc_arch = of_get_property(root, "architecture", &propsize);
+ return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
+}
+
+static u32 __init get_board_revision(struct device_node *root)
+{
+ int propsize;
+ const __be32 *rev;
+
+ rev = of_get_property(root, "board-revision-int", &propsize);
+ if (propsize != 4)
+ return 0;
+
+ return be32_to_cpu(*rev);
+}
+
+static bool __init platform_detect(void)
+{
+ struct device_node *root = of_find_node_by_path("/");
+ bool success;
+
+ if (!root)
+ return false;
+
+ success = check_ofw_architecture(root);
+ if (success) {
+ olpc_platform_info.boardrev = get_board_revision(root);
+ olpc_platform_info.flags |= OLPC_F_PRESENT;
+ }
+
+ of_node_put(root);
+ return success;
+}
+
+static int __init add_xo1_platform_devices(void)
+{
+ struct platform_device *pdev;
+
+ pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ return 0;
+}
+
+static struct syscore_ops olpc_syscore_ops = {
+ .suspend = olpc_ec_suspend,
+};
+
+static int __init olpc_init(void)
+{
+ int r = 0;
+
+ if (!olpc_ofw_present() || !platform_detect())
+ return 0;
+
+ spin_lock_init(&ec_lock);
+
+ /* 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);
+
+#ifdef CONFIG_PCI_OLPC
+ /* If the VSA exists let it emulate PCI, if not emulate in kernel.
+ * XO-1 only. */
+ if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) &&
+ !cs5535_has_vsa2())
+ x86_init.pci.arch_init = pci_olpc_init;
+#endif
+ /* EC version 0x5f adds support for wide SCI mask */
+ if (olpc_platform_info.ecver >= 0x5f)
+ olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
+
+ 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);
+
+ if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */
+ r = add_xo1_platform_devices();
+ if (r)
+ return r;
+ }
+
+ register_syscore_ops(&olpc_syscore_ops);
+ setup_debugfs();
+
+ return 0;
+}
+
+postcore_initcall(olpc_init);
generated by cgit (git 2.34.1) at 2024-12-20 10:38:43 +0000