Subject: Re: [PATCH 6/9] x86: OLPC: switch over to using new EC driver on x86

From: Andres Salomon <[email-masked]>
Date: Wed, 18 Jul 2012 21:36:05 -0700

Damnit, my mailer mangled the resend.  Okay, 3rd time's a charm..
(sorry for the noise!)

On Wed, 18 Jul 2012 21:28:27 -0700
Andres Salomon <[email-masked]> wrote:

> 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 <[email-masked]>
> ---
>  arch/x86/include/asm/olpc.h     |    5 ---
>  arch/x86/platform/olpc/olpc.c   |   53
> ++++++++++++++++++++-------------------
> drivers/platform/olpc/olpc-ec.c |    5 --- 3 files changed, 27
> insertions(+), 36 deletions(-)
> 
> diff --git a/arch/x86/include/asm/olpc.h b/arch/x86/include/asm/olpc.h
> index 5b28f3e..72f9adf6 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 a3fa180..4590096 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;
> diff --git a/drivers/platform/olpc/olpc-ec.c
> b/drivers/platform/olpc/olpc-ec.c index cfba41f..a3d32c2 100644
> --- a/drivers/platform/olpc/olpc-ec.c
> +++ b/drivers/platform/olpc/olpc-ec.c
> @@ -113,11 +113,6 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen,
> u8 *outbuf, size_t outlen) struct olpc_ec_priv *ec = ec_priv;
>  	struct ec_cmd_desc desc;
>  
> -	/* XXX: this will be removed in later patches */
> -	/* Are we using old-style callers? */
> -	if (!ec_driver || !ec_driver->ec_cmd)
> -		return olpc_ec_cmd_x86(cmd, inbuf, inlen, outbuf,
> outlen); -
>  	/* Ensure a driver and ec hook have been registered */
>  	if (WARN_ON(!ec_driver || !ec_driver->ec_cmd))
>  		return -ENODEV;