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    Subject[PATCH v2 05/11] x86, olpc: Add XO-1 SCI driver and power button control
    Date
    The System Control Interrupt is used in the OLPC XO-1 to control various
    features of the laptop. Add the driver base and the power button
    functionality.

    This driver can't be built as a module, because functionality added in
    future patches means that some drivers need to know at boot-time whether
    SCI-based functionality is available.

    Signed-off-by: Daniel Drake <dsd@laptop.org>
    Acked-by: Andres Salomon <dilinger@queued.net>
    ---
    arch/x86/Kconfig | 7 ++
    arch/x86/platform/olpc/Makefile | 1 +
    arch/x86/platform/olpc/olpc-xo1-sci.c | 191 +++++++++++++++++++++++++++++++++
    include/linux/cs5535.h | 8 ++
    4 files changed, 207 insertions(+), 0 deletions(-)
    create mode 100644 arch/x86/platform/olpc/olpc-xo1-sci.c

    diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
    index c9cdd7b..fb9d136 100644
    --- a/arch/x86/Kconfig
    +++ b/arch/x86/Kconfig
    @@ -2079,6 +2079,13 @@ config OLPC_XO1_PM
    ---help---
    Add support for poweroff and suspend of the OLPC XO-1 laptop.

    +config OLPC_XO1_SCI
    + bool "OLPC XO-1 SCI extras"
    + depends on OLPC && OLPC_XO1_PM
    + ---help---
    + Add support for SCI-based features of the OLPC XO-1 laptop:
    + - Power button
    +
    endif # X86_32

    config AMD_NB
    diff --git a/arch/x86/platform/olpc/Makefile b/arch/x86/platform/olpc/Makefile
    index 1ae7bed..1ec5ade 100644
    --- a/arch/x86/platform/olpc/Makefile
    +++ b/arch/x86/platform/olpc/Makefile
    @@ -1,2 +1,3 @@
    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_SCI) += olpc-xo1-sci.o
    diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c
    new file mode 100644
    index 0000000..8fbf961
    --- /dev/null
    +++ b/arch/x86/platform/olpc/olpc-xo1-sci.c
    @@ -0,0 +1,191 @@
    +/*
    + * Support for OLPC XO-1 System Control Interrupts (SCI)
    + *
    + * Copyright (C) 2010 One Laptop per Child
    + * Copyright (C) 2006 Red Hat, Inc.
    + * 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/cs5535.h>
    +#include <linux/input.h>
    +#include <linux/interrupt.h>
    +#include <linux/platform_device.h>
    +#include <linux/pm.h>
    +#include <linux/mfd/core.h>
    +#include <linux/suspend.h>
    +
    +#include <asm/io.h>
    +#include <asm/msr.h>
    +#include <asm/olpc.h>
    +
    +#define DRV_NAME "olpc-xo1-sci"
    +#define PFX DRV_NAME ": "
    +
    +static unsigned long acpi_base;
    +static struct input_dev *power_button_idev;
    +static int sci_irq;
    +
    +static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
    +{
    + struct platform_device *pdev = dev_id;
    + u32 sts;
    + u32 gpe;
    +
    + sts = inl(acpi_base + CS5536_PM1_STS);
    + outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
    +
    + gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
    + outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
    +
    + dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
    +
    + if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
    + input_report_key(power_button_idev, KEY_POWER, 1);
    + input_sync(power_button_idev);
    + input_report_key(power_button_idev, KEY_POWER, 0);
    + input_sync(power_button_idev);
    + }
    +
    + return IRQ_HANDLED;
    +}
    +
    +static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
    +{
    + if (device_may_wakeup(&power_button_idev->dev))
    + olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
    + else
    + olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
    + return 0;
    +}
    +
    +static int __devinit setup_sci_interrupt(struct platform_device *pdev)
    +{
    + u32 lo, hi;
    + u32 sts;
    + int r;
    +
    + rdmsr(0x51400020, lo, hi);
    + sci_irq = (lo >> 20) & 15;
    +
    + if (sci_irq) {
    + dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
    + } else {
    + /* Zero means masked */
    + dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
    + sci_irq = 3;
    + lo |= 0x00300000;
    + wrmsrl(0x51400020, lo);
    + }
    +
    + /* Select level triggered in PIC */
    + if (sci_irq < 8) {
    + lo = inb(CS5536_PIC_INT_SEL1);
    + lo |= 1 << sci_irq;
    + outb(lo, CS5536_PIC_INT_SEL1);
    + } else {
    + lo = inb(CS5536_PIC_INT_SEL2);
    + lo |= 1 << (sci_irq - 8);
    + outb(lo, CS5536_PIC_INT_SEL2);
    + }
    +
    + /* Enable SCI from power button, and clear pending interrupts */
    + sts = inl(acpi_base + CS5536_PM1_STS);
    + outl((CS5536_PM_PWRBTN << 16) | 0xffff, acpi_base + CS5536_PM1_STS);
    +
    + r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
    + if (r)
    + dev_err(&pdev->dev, "can't request interrupt\n");
    +
    + return r;
    +}
    +
    +static int __devinit setup_power_button(struct platform_device *pdev)
    +{
    + int r;
    +
    + power_button_idev = input_allocate_device();
    + if (!power_button_idev)
    + return -ENOMEM;
    +
    + power_button_idev->name = "Power Button";
    + power_button_idev->phys = DRV_NAME "/input0";
    + set_bit(EV_KEY, power_button_idev->evbit);
    + set_bit(KEY_POWER, power_button_idev->keybit);
    +
    + power_button_idev->dev.parent = &pdev->dev;
    + device_init_wakeup(&power_button_idev->dev, 1);
    +
    + r = input_register_device(power_button_idev);
    + if (r) {
    + dev_err(&pdev->dev, "failed to register power button: %d\n", r);
    + input_free_device(power_button_idev);
    + }
    +
    + return r;
    +}
    +
    +static void free_power_button(void)
    +{
    + input_unregister_device(power_button_idev);
    + input_free_device(power_button_idev);
    +}
    +
    +static int __devinit xo1_sci_probe(struct platform_device *pdev)
    +{
    + struct resource *res;
    + int r;
    +
    + /* don't run on non-XOs */
    + if (!machine_is_olpc())
    + return -ENODEV;
    +
    + r = mfd_cell_enable(pdev);
    + if (r)
    + return r;
    +
    + res = platform_get_resource(pdev, IORESOURCE_IO, 0);
    + if (!res) {
    + dev_err(&pdev->dev, "can't fetch device resource info\n");
    + return -EIO;
    + }
    + acpi_base = res->start;
    +
    + r = setup_power_button(pdev);
    + if (r)
    + return r;
    +
    + r = setup_sci_interrupt(pdev);
    + if (r)
    + free_power_button();
    +
    + return r;
    +}
    +
    +static int __devexit xo1_sci_remove(struct platform_device *pdev)
    +{
    + mfd_cell_disable(pdev);
    + free_irq(sci_irq, pdev);
    + free_power_button();
    + acpi_base = 0;
    + return 0;
    +}
    +
    +static struct platform_driver xo1_sci_driver = {
    + .driver = {
    + .name = "olpc-xo1-sci-acpi",
    + },
    + .probe = xo1_sci_probe,
    + .remove = __devexit_p(xo1_sci_remove),
    + .suspend = xo1_sci_suspend,
    +};
    +
    +static int __init xo1_sci_init(void)
    +{
    + return platform_driver_register(&xo1_sci_driver);
    +}
    +arch_initcall(xo1_sci_init);
    diff --git a/include/linux/cs5535.h b/include/linux/cs5535.h
    index 2facf16..6f78235 100644
    --- a/include/linux/cs5535.h
    +++ b/include/linux/cs5535.h
    @@ -43,6 +43,10 @@
    #define MSR_GX_GLD_MSR_CONFIG 0xC0002001
    #define MSR_GX_MSR_PADSEL 0xC0002011

    +/* PIC registers */
    +#define CS5536_PIC_INT_SEL1 0x4d0
    +#define CS5536_PIC_INT_SEL2 0x4d1
    +
    /* resource sizes */
    #define LBAR_GPIO_SIZE 0xFF
    #define LBAR_MFGPT_SIZE 0x40
    @@ -70,6 +74,10 @@
    #define CS5536_PM1_CNT 0x08
    #define CS5536_PM_GPE0_STS 0x18

    +/* CS5536_PM1_STS bits */
    +#define CS5536_WAK_FLAG (1 << 15)
    +#define CS5536_PWRBTN_FLAG (1 << 8)
    +
    /* CS5536_PM1_EN bits */
    #define CS5536_PM_PWRBTN (1 << 8)

    --
    1.7.5.2


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