x86: OLPC: switch over to using new EC driver on x86

This uses the new EC driver framework in drivers/platform/olpc.  The
XO-1 and XO-1.5-specific code is still in arch/x86, but the generic stuff
(including a new workqueue; no more running EC commands with IRQs disabled!)
can be shared with other architectures.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Acked-by: Paul Fox <pgf@laptop.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 27 insertions, 31 deletions

diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
index 5b28f3e6975..72f9adf6eca 100644
--- a/arch/x86/include/asm/olpc.h
+++ b/arch/x86/include/asm/olpc.h
@@ -100,11 +100,6 @@ extern void olpc_xo1_pm_wakeup_clear(u16 value);
 
 extern int pci_olpc_init(void);
 
-/* EC related functions */
-
-extern int olpc_ec_cmd_x86(unsigned char cmd, unsigned char *inbuf,
-                size_t inlen, unsigned char *outbuf, size_t outlen);
-
 /* SCI source values */
 
 #define EC_SCI_SRC_EMPTY        0x00
diff --git a/arch/x86/platform/olpc/olpc.c b/arch/x86/platform/olpc/olpc.c
index a3fa180c15c..45900968fb8 100644
--- a/arch/x86/platform/olpc/olpc.c
+++ b/arch/x86/platform/olpc/olpc.c
@@ -14,7 +14,6 @@
 #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>
@@ -32,8 +31,6 @@
 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)
@@ -126,16 +123,13 @@ static int __wait_on_obf(unsigned int line, unsigned int port, int desired)
  * <http://wiki.laptop.org/go/Ec_specification>.  Unfortunately, while
  * OpenFirmware's source is available, the EC's is not.
  */
-int olpc_ec_cmd_x86(unsigned char cmd, unsigned char *inbuf, size_t inlen,
-                unsigned char *outbuf,  size_t outlen)
+static int olpc_xo1_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf,
+                size_t outlen, void *arg)
 {
-        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);
@@ -199,10 +193,8 @@ restart:
 
         ret = 0;
 err:
-        spin_unlock_irqrestore(&ec_lock, flags);
         return ret;
 }
-EXPORT_SYMBOL_GPL(olpc_ec_cmd_x86);
 
 void olpc_ec_wakeup_set(u16 value)
 {
@@ -366,7 +358,7 @@ static void setup_debugfs(void)
                             &ec_debugfs_genops);
 }
 
-static int olpc_ec_suspend(void)
+static int olpc_ec_suspend(struct platform_device *pdev)
 {
         return olpc_ec_mask_write(ec_wakeup_mask);
 }
@@ -425,8 +417,28 @@ static int __init add_xo1_platform_devices(void)
         return 0;
 }
 
-static struct syscore_ops olpc_syscore_ops = {
+static int olpc_xo1_ec_probe(struct platform_device *pdev)
+{
+        /* get the EC revision */
+        olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0,
+                        (unsigned char *) &olpc_platform_info.ecver, 1);
+
+        /* EC version 0x5f adds support for wide SCI mask */
+        if (olpc_platform_info.ecver >= 0x5f)
+                olpc_platform_info.flags |= OLPC_F_EC_WIDE_SCI;
+
+        pr_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);
+
+        return 0;
+}
+
+static struct olpc_ec_driver ec_xo1_driver = {
         .suspend = olpc_ec_suspend,
+        .probe = olpc_xo1_ec_probe,
+        .ec_cmd = olpc_xo1_ec_cmd,
 };
 
 static int __init olpc_init(void)
@@ -436,16 +448,14 @@ static int __init olpc_init(void)
         if (!olpc_ofw_present() || !platform_detect())
                 return 0;
 
-        spin_lock_init(&ec_lock);
+        /* register the XO-1 and 1.5-specific EC handler */
+        olpc_ec_driver_register(&ec_xo1_driver, NULL);
+        platform_device_register_simple("olpc-ec", -1, NULL, 0);
 
         /* 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. */
@@ -453,14 +463,6 @@ static int __init olpc_init(void)
                         !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();
@@ -468,7 +470,6 @@ static int __init olpc_init(void)
                         return r;
         }
 
-        register_syscore_ops(&olpc_syscore_ops);
         setup_debugfs();
 
         return 0;