x86, olpc: Add XO-1 SCI driver and power button control
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> Link: http://lkml.kernel.org/r/1309019658-1712-6-git-send-email-dsd@laptop.org Acked-by: Andres Salomon <dilinger@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Daniel Drake
H. Peter Anvin
parent
97c4cb71c1
commit
7feda8e9f3
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@ -2080,6 +2080,15 @@ config OLPC_XO1_PM
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---help---
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Add support for poweroff and suspend of the OLPC XO-1 laptop.
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config OLPC_XO1_SCI
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bool "OLPC XO-1 SCI extras"
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depends on OLPC && OLPC_XO1_PM
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select GPIO_CS5535
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select MFD_CORE
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---help---
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Add support for SCI-based features of the OLPC XO-1 laptop:
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- Power button
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endif # X86_32
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config AMD_NB
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@ -1,2 +1,3 @@
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obj-$(CONFIG_OLPC) += olpc.o olpc_ofw.o olpc_dt.o
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obj-$(CONFIG_OLPC_XO1_PM) += olpc-xo1-pm.o xo1-wakeup.o
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obj-$(CONFIG_OLPC_XO1_SCI) += olpc-xo1-sci.o
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@ -0,0 +1,191 @@
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/*
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* Support for OLPC XO-1 System Control Interrupts (SCI)
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*
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* Copyright (C) 2010 One Laptop per Child
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* Copyright (C) 2006 Red Hat, Inc.
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* Copyright (C) 2006 Advanced Micro Devices, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/cs5535.h>
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#include <linux/input.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/mfd/core.h>
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#include <linux/suspend.h>
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#include <asm/io.h>
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#include <asm/msr.h>
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#include <asm/olpc.h>
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#define DRV_NAME "olpc-xo1-sci"
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#define PFX DRV_NAME ": "
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static unsigned long acpi_base;
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static struct input_dev *power_button_idev;
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static int sci_irq;
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static irqreturn_t xo1_sci_intr(int irq, void *dev_id)
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{
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struct platform_device *pdev = dev_id;
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u32 sts;
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u32 gpe;
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sts = inl(acpi_base + CS5536_PM1_STS);
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outl(sts | 0xffff, acpi_base + CS5536_PM1_STS);
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gpe = inl(acpi_base + CS5536_PM_GPE0_STS);
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outl(0xffffffff, acpi_base + CS5536_PM_GPE0_STS);
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dev_dbg(&pdev->dev, "sts %x gpe %x\n", sts, gpe);
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if (sts & CS5536_PWRBTN_FLAG && !(sts & CS5536_WAK_FLAG)) {
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input_report_key(power_button_idev, KEY_POWER, 1);
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input_sync(power_button_idev);
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input_report_key(power_button_idev, KEY_POWER, 0);
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input_sync(power_button_idev);
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}
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return IRQ_HANDLED;
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}
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static int xo1_sci_suspend(struct platform_device *pdev, pm_message_t state)
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{
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if (device_may_wakeup(&power_button_idev->dev))
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olpc_xo1_pm_wakeup_set(CS5536_PM_PWRBTN);
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else
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olpc_xo1_pm_wakeup_clear(CS5536_PM_PWRBTN);
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return 0;
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}
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static int __devinit setup_sci_interrupt(struct platform_device *pdev)
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{
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u32 lo, hi;
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u32 sts;
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int r;
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rdmsr(0x51400020, lo, hi);
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sci_irq = (lo >> 20) & 15;
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if (sci_irq) {
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dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
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} else {
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/* Zero means masked */
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dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
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sci_irq = 3;
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lo |= 0x00300000;
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wrmsrl(0x51400020, lo);
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}
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/* Select level triggered in PIC */
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if (sci_irq < 8) {
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lo = inb(CS5536_PIC_INT_SEL1);
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lo |= 1 << sci_irq;
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outb(lo, CS5536_PIC_INT_SEL1);
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} else {
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lo = inb(CS5536_PIC_INT_SEL2);
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lo |= 1 << (sci_irq - 8);
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outb(lo, CS5536_PIC_INT_SEL2);
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}
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/* Enable SCI from power button, and clear pending interrupts */
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sts = inl(acpi_base + CS5536_PM1_STS);
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outl((CS5536_PM_PWRBTN << 16) | 0xffff, acpi_base + CS5536_PM1_STS);
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r = request_irq(sci_irq, xo1_sci_intr, 0, DRV_NAME, pdev);
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if (r)
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dev_err(&pdev->dev, "can't request interrupt\n");
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return r;
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}
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static int __devinit setup_power_button(struct platform_device *pdev)
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{
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int r;
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power_button_idev = input_allocate_device();
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if (!power_button_idev)
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return -ENOMEM;
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power_button_idev->name = "Power Button";
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power_button_idev->phys = DRV_NAME "/input0";
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set_bit(EV_KEY, power_button_idev->evbit);
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set_bit(KEY_POWER, power_button_idev->keybit);
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power_button_idev->dev.parent = &pdev->dev;
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device_init_wakeup(&power_button_idev->dev, 1);
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r = input_register_device(power_button_idev);
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if (r) {
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dev_err(&pdev->dev, "failed to register power button: %d\n", r);
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input_free_device(power_button_idev);
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}
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return r;
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}
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static void free_power_button(void)
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{
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input_unregister_device(power_button_idev);
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input_free_device(power_button_idev);
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}
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static int __devinit xo1_sci_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int r;
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/* don't run on non-XOs */
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if (!machine_is_olpc())
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return -ENODEV;
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r = mfd_cell_enable(pdev);
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if (r)
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return r;
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!res) {
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dev_err(&pdev->dev, "can't fetch device resource info\n");
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return -EIO;
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}
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acpi_base = res->start;
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r = setup_power_button(pdev);
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if (r)
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return r;
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r = setup_sci_interrupt(pdev);
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if (r)
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free_power_button();
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return r;
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}
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static int __devexit xo1_sci_remove(struct platform_device *pdev)
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{
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mfd_cell_disable(pdev);
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free_irq(sci_irq, pdev);
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free_power_button();
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acpi_base = 0;
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return 0;
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}
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static struct platform_driver xo1_sci_driver = {
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.driver = {
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.name = "olpc-xo1-sci-acpi",
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},
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.probe = xo1_sci_probe,
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.remove = __devexit_p(xo1_sci_remove),
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.suspend = xo1_sci_suspend,
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};
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static int __init xo1_sci_init(void)
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{
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return platform_driver_register(&xo1_sci_driver);
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}
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arch_initcall(xo1_sci_init);
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@ -43,6 +43,10 @@
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#define MSR_GX_GLD_MSR_CONFIG 0xC0002001
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#define MSR_GX_MSR_PADSEL 0xC0002011
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/* PIC registers */
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#define CS5536_PIC_INT_SEL1 0x4d0
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#define CS5536_PIC_INT_SEL2 0x4d1
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/* resource sizes */
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#define LBAR_GPIO_SIZE 0xFF
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#define LBAR_MFGPT_SIZE 0x40
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@ -70,6 +74,10 @@
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#define CS5536_PM1_CNT 0x08
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#define CS5536_PM_GPE0_STS 0x18
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/* CS5536_PM1_STS bits */
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#define CS5536_WAK_FLAG (1 << 15)
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#define CS5536_PWRBTN_FLAG (1 << 8)
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/* CS5536_PM1_EN bits */
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#define CS5536_PM_PWRBTN (1 << 8)
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