x86, olpc: Add XO-1 poweroff support

Add a pm_power_off handler for the OLPC XO-1 laptop.

The driver can be built modular and follows the behaviour of the
APM driver, setting pm_power_off to NULL on unload. However, the
ability to unload the module will probably be removed (with a simple
__module_get(THIS_MODULE)) if/when XO-1 suspend/resume support is
added to this file at a later date.

Signed-off-by: Daniel Drake <dsd@laptop.org>
LKML-Reference: <20101010094032.9AE669D401B@zog.reactivated.net>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c25525571347cc5dc763ab4a52c4f5696f21159c..0bcb8765b1c018011e134ec3d9e237561b630b2b 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2066,6 +2066,12 @@ config OLPC
          Add support for detecting the unique features of the OLPC
          XO hardware.
 
+config OLPC_XO1
+       tristate "OLPC XO-1 support"
+       depends on OLPC
+       ---help---
+         Add support for non-essential features of the OLPC XO-1 laptop.
+
 config OLPC_OPENFIRMWARE
        bool "Support for OLPC's Open Firmware"
        depends on !X86_64 && !X86_PAE

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 0925676266bdbc9cbcf03811916b9f8b9b9e627e..e9777791e39ccc5c4f0f374dff677c9d5ed51c9e 100644 (file)
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -104,6 +104,7 @@ obj-$(CONFIG_SCx200)                += scx200.o
 scx200-y                       += scx200_32.o
 
 obj-$(CONFIG_OLPC)             += olpc.o
+obj-$(CONFIG_OLPC_XO1)         += olpc-xo1.o
 obj-$(CONFIG_OLPC_OPENFIRMWARE)        += olpc_ofw.o
 obj-$(CONFIG_X86_MRST)         += mrst.o
 

diff --git a/arch/x86/kernel/olpc-xo1.c b/arch/x86/kernel/olpc-xo1.c
new file mode 100644 (file)
index 0000000..f5442c0
--- /dev/null
+++ b/arch/x86/kernel/olpc-xo1.c
@@ -0,0 +1,140 @@
+/*
+ * Support for features of the OLPC XO-1 laptop
+ *
+ * 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/module.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+
+#include <asm/io.h>
+#include <asm/olpc.h>
+
+#define DRV_NAME "olpc-xo1"
+
+#define PMS_BAR                4
+#define ACPI_BAR       5
+
+/* PMC registers (PMS block) */
+#define PM_SCLK                0x10
+#define PM_IN_SLPCTL   0x20
+#define PM_WKXD                0x34
+#define PM_WKD         0x30
+#define PM_SSC         0x54
+
+/* PM registers (ACPI block) */
+#define PM1_CNT                0x08
+#define PM_GPE0_STS    0x18
+
+static unsigned long acpi_base;
+static unsigned long pms_base;
+
+static void xo1_power_off(void)
+{
+       printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
+
+       /* Enable all of these controls with 0 delay */
+       outl(0x40000000, pms_base + PM_SCLK);
+       outl(0x40000000, pms_base + PM_IN_SLPCTL);
+       outl(0x40000000, pms_base + PM_WKXD);
+       outl(0x40000000, pms_base + PM_WKD);
+
+       /* Clear status bits (possibly unnecessary) */
+       outl(0x0002ffff, pms_base  + PM_SSC);
+       outl(0xffffffff, acpi_base + PM_GPE0_STS);
+
+       /* Write SLP_EN bit to start the machinery */
+       outl(0x00002000, acpi_base + PM1_CNT);
+}
+
+/* Read the base addresses from the PCI BAR info */
+static int __devinit setup_bases(struct pci_dev *pdev)
+{
+       int r;
+
+       r = pci_enable_device_io(pdev);
+       if (r) {
+               dev_err(&pdev->dev, "can't enable device IO\n");
+               return r;
+       }
+
+       r = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
+       if (r) {
+               dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", ACPI_BAR);
+               return r;
+       }
+
+       r = pci_request_region(pdev, PMS_BAR, DRV_NAME);
+       if (r) {
+               dev_err(&pdev->dev, "can't alloc PCI BAR #%d\n", PMS_BAR);
+               pci_release_region(pdev, ACPI_BAR);
+               return r;
+       }
+
+       acpi_base = pci_resource_start(pdev, ACPI_BAR);
+       pms_base = pci_resource_start(pdev, PMS_BAR);
+
+       return 0;
+}
+
+static int __devinit olpc_xo1_probe(struct platform_device *pdev)
+{
+       struct pci_dev *pcidev;
+       int r;
+
+       pcidev = pci_get_device(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA,
+                               NULL);
+       if (!pdev)
+               return -ENODEV;
+
+       r = setup_bases(pcidev);
+       if (r)
+               return r;
+
+       pm_power_off = xo1_power_off;
+
+       printk(KERN_INFO "OLPC XO-1 support registered\n");
+       return 0;
+}
+
+static int __devexit olpc_xo1_remove(struct platform_device *pdev)
+{
+       pm_power_off = NULL;
+       return 0;
+}
+
+static struct platform_driver olpc_xo1_driver = {
+       .driver = {
+               .name = DRV_NAME,
+               .owner = THIS_MODULE,
+       },
+       .probe = olpc_xo1_probe,
+       .remove = __devexit_p(olpc_xo1_remove),
+};
+
+static int __init olpc_xo1_init(void)
+{
+       return platform_driver_register(&olpc_xo1_driver);
+}
+
+static void __exit olpc_xo1_exit(void)
+{
+       platform_driver_unregister(&olpc_xo1_driver);
+}
+
+MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:olpc-xo1");
+
+module_init(olpc_xo1_init);
+module_exit(olpc_xo1_exit);