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Date: Thu, 19 May 2011 13:35:25 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Daniel Drake <dsd@...top.org>
Cc: tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
x86@...nel.org, linux-kernel@...r.kernel.org, dilinger@...ued.net,
devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH 10/11] x86, olpc: Add XO-1 RTC driver
On Sat, Apr 30, 2011 at 01:32:29PM +0100, Daniel Drake wrote:
> Add a driver to configure the XO-1 RTC via CS5536 MSRs, to be used as a
> system wakeup source via olpc-xo1-pm.
>
> Device detection is based on finding the relevant device tree node.
>
> Signed-off-by: Daniel Drake <dsd@...top.org>
> Cc: devicetree-discuss@...ts.ozlabs.org
Looks good to me.
Acked-by: Grant Likely <grant.likely@...retlab.ca>
> ---
> .../devicetree/bindings/rtc/olpc-xo1-rtc.txt | 5 +
> arch/x86/Kconfig | 7 ++
> arch/x86/platform/olpc/Makefile | 1 +
> arch/x86/platform/olpc/olpc-xo1-rtc.c | 82 ++++++++++++++++++++
> include/linux/cs5535.h | 5 +
> 5 files changed, 100 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/rtc/olpc-xo1-rtc.txt
> create mode 100644 arch/x86/platform/olpc/olpc-xo1-rtc.c
>
> diff --git a/Documentation/devicetree/bindings/rtc/olpc-xo1-rtc.txt b/Documentation/devicetree/bindings/rtc/olpc-xo1-rtc.txt
> new file mode 100644
> index 0000000..a2891ce
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/olpc-xo1-rtc.txt
> @@ -0,0 +1,5 @@
> +OLPC XO-1 RTC
> +~~~~~~~~~~~~~
> +
> +Required properties:
> + - compatible : "olpc,xo1-rtc"
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 583e1c5..eb9f377 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2072,6 +2072,13 @@ config OLPC_XO1_PM
> ---help---
> Add support for poweroff and suspend of the OLPC XO-1 laptop.
>
> +config OLPC_XO1_RTC
> + bool "OLPC XO-1 Real Time Clock"
> + depends on OLPC_XO1_PM && RTC_DRV_CMOS
> + ---help---
> + Add support for the XO-1 real time clock, which can be used as a
> + programmable wakeup source.
> +
> config OLPC_XO1_SCI
> bool "OLPC XO-1 SCI extras"
> depends on OLPC && OLPC_XO1_PM && POWER_SUPPLY
> diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile
> index 1ec5ade..8922b9b 100644
> --- a/arch/x86/platform/olpc/Makefile
> +++ b/arch/x86/platform/olpc/Makefile
> @@ -1,3 +1,4 @@
> obj-$(CONFIG_OLPC) += olpc.o olpc_ofw.o olpc_dt.o
> obj-$(CONFIG_OLPC_XO1_PM) += olpc-xo1-pm.o xo1-wakeup.o
> +obj-$(CONFIG_OLPC_XO1_RTC) += olpc-xo1-rtc.o
> obj-$(CONFIG_OLPC_XO1_SCI) += olpc-xo1-sci.o
> diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c
> new file mode 100644
> index 0000000..476cc98
> --- /dev/null
> +++ b/arch/x86/platform/olpc/olpc-xo1-rtc.c
> @@ -0,0 +1,82 @@
> +/*
> + * Support for OLPC XO-1 Real Time Clock (RTC)
> + *
> + * Copyright (C) 2011 One Laptop per Child
> + *
> + * 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/mc146818rtc.h>
> +#include <linux/platform_device.h>
> +#include <linux/rtc.h>
> +#include <linux/of.h>
> +
> +#include <asm/msr.h>
> +#include <asm/olpc.h>
> +
> +static void rtc_wake_on(struct device *dev)
> +{
> + olpc_xo1_pm_wakeup_set(CS5536_PM_RTC);
> +}
> +
> +static void rtc_wake_off(struct device *dev)
> +{
> + olpc_xo1_pm_wakeup_clear(CS5536_PM_RTC);
> +}
> +
> +static struct resource rtc_platform_resource[] = {
> + [0] = {
> + .start = RTC_PORT(0),
> + .end = RTC_PORT(1),
> + .flags = IORESOURCE_IO,
> + },
> + [1] = {
> + .start = RTC_IRQ,
> + .end = RTC_IRQ,
> + .flags = IORESOURCE_IRQ,
> + }
> +};
> +
> +static struct cmos_rtc_board_info rtc_info = {
> + .rtc_day_alarm = 0,
> + .rtc_mon_alarm = 0,
> + .rtc_century = 0,
> + .wake_on = rtc_wake_on,
> + .wake_off = rtc_wake_off,
> +};
> +
> +static struct platform_device xo1_rtc_device = {
> + .name = "rtc_cmos",
> + .id = -1,
> + .num_resources = ARRAY_SIZE(rtc_platform_resource),
> + .dev.platform_data = &rtc_info,
> + .resource = rtc_platform_resource,
> +};
> +
> +static int __init xo1_rtc_init(void)
> +{
> + int r;
> + struct device_node *node;
> +
> + node = of_find_compatible_node(NULL, NULL, "olpc,xo1-rtc");
> + if (!node)
> + return 0;
> + of_node_put(node);
> +
> + pr_info("olpc-xo1-rtc: Initializing OLPC XO-1 RTC\n");
> + rdmsrl(MSR_RTC_DOMA_OFFSET, rtc_info.rtc_day_alarm);
> + rdmsrl(MSR_RTC_MONA_OFFSET, rtc_info.rtc_mon_alarm);
> + rdmsrl(MSR_RTC_CEN_OFFSET, rtc_info.rtc_century);
> +
> + r = platform_device_register(&xo1_rtc_device);
> + if (r)
> + return r;
> +
> + device_init_wakeup(&xo1_rtc_device.dev, 1);
> + return 0;
> +}
> +arch_initcall(xo1_rtc_init);
> +
> diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
> index f2b4a2f..3f98d81 100644
> --- a/include/linux/cs5535.h
> +++ b/include/linux/cs5535.h
> @@ -38,6 +38,10 @@
> #define MSR_MFGPT_NR 0x51400029
> #define MSR_MFGPT_SETUP 0x5140002B
>
> +#define MSR_RTC_DOMA_OFFSET 0x51400055
> +#define MSR_RTC_MONA_OFFSET 0x51400056
> +#define MSR_RTC_CEN_OFFSET 0x51400057
> +
> #define MSR_LX_SPARE_MSR 0x80000011 /* DC-specific */
>
> #define MSR_GX_GLD_MSR_CONFIG 0xC0002001
> @@ -81,6 +85,7 @@
>
> /* CS5536_PM1_EN bits */
> #define CS5536_PM_PWRBTN (1 << 8)
> +#define CS5536_PM_RTC (1 << 10)
>
> /* CS5536_PM_GPE0_STS bits */
> #define CS5536_GPIOM7_PME_FLAG (1 << 31)
> --
> 1.7.4.4
>
> --
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