x86, olpc: Add XO-1 SCI driver and power button control (7feda8e9) · Commits · 戴 / test

arch/x86/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -2080,6 +2080,15 @@ 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
		select GPIO_CS5535
		select MFD_CORE
		---help---
		Add support for SCI-based features of the OLPC XO-1 laptop:
		- Power button

		endif # X86_32

		config AMD_NB

arch/x86/platform/olpc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		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

arch/x86/platform/olpc/olpc-xo1-sci.c

0 → 100644

+191 −0

Original line number	Diff line number	Diff line
		/*
		* 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);

include/linux/cs5535.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -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)

Admin message