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1310e6d638
This enables sharing of cs5535-mfd cells via the new mfd_shared_* API.
Hooks for enable/disble of resources are added, with refcounting of
resources being automatically handled so that cs5535_mfd_res_enable/disable
are only called when necessary.
Clients of cs5535-mfd (in this case, olpc-xo1.c) are also modified to
use the mfd_shared API. The platform drivers are also renamed to
olpc-xo1-{pms,acpi}, and resource enabling/disabling is replaced
with mfd_shared API calls.
Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
/*
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* Support for features of the OLPC XO-1 laptop
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*
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* Copyright (C) 2010 Andres Salomon <dilinger@queued.net>
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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/module.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 <asm/io.h>
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#include <asm/olpc.h>
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#define DRV_NAME "olpc-xo1"
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/* PMC registers (PMS block) */
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#define PM_SCLK 0x10
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#define PM_IN_SLPCTL 0x20
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#define PM_WKXD 0x34
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#define PM_WKD 0x30
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#define PM_SSC 0x54
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/* PM registers (ACPI block) */
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#define PM1_CNT 0x08
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#define PM_GPE0_STS 0x18
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static unsigned long acpi_base;
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static unsigned long pms_base;
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static void xo1_power_off(void)
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{
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printk(KERN_INFO "OLPC XO-1 power off sequence...\n");
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/* Enable all of these controls with 0 delay */
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outl(0x40000000, pms_base + PM_SCLK);
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outl(0x40000000, pms_base + PM_IN_SLPCTL);
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outl(0x40000000, pms_base + PM_WKXD);
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outl(0x40000000, pms_base + PM_WKD);
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/* Clear status bits (possibly unnecessary) */
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outl(0x0002ffff, pms_base + PM_SSC);
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outl(0xffffffff, acpi_base + PM_GPE0_STS);
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/* Write SLP_EN bit to start the machinery */
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outl(0x00002000, acpi_base + PM1_CNT);
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}
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static int __devinit olpc_xo1_probe(struct platform_device *pdev)
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{
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struct resource *res;
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int err;
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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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err = mfd_shared_cell_enable(pdev);
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if (err)
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return err;
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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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if (strcmp(pdev->name, "olpc-xo1-pms") == 0)
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pms_base = res->start;
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else if (strcmp(pdev->name, "olpc-xo1-ac-acpi") == 0)
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acpi_base = res->start;
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/* If we have both addresses, we can override the poweroff hook */
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if (pms_base && acpi_base) {
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pm_power_off = xo1_power_off;
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printk(KERN_INFO "OLPC XO-1 support registered\n");
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}
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return 0;
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}
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static int __devexit olpc_xo1_remove(struct platform_device *pdev)
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{
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mfd_shared_cell_disable(pdev);
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if (strcmp(pdev->name, "olpc-xo1-pms") == 0)
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pms_base = 0;
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else if (strcmp(pdev->name, "olpc-xo1-acpi") == 0)
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acpi_base = 0;
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pm_power_off = NULL;
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return 0;
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}
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static struct platform_driver cs5535_pms_drv = {
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.driver = {
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.name = "olpc-xo1-pms",
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.owner = THIS_MODULE,
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},
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.probe = olpc_xo1_probe,
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.remove = __devexit_p(olpc_xo1_remove),
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};
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static struct platform_driver cs5535_acpi_drv = {
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.driver = {
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.name = "olpc-xo1-acpi",
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.owner = THIS_MODULE,
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},
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.probe = olpc_xo1_probe,
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.remove = __devexit_p(olpc_xo1_remove),
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};
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static int __init olpc_xo1_init(void)
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{
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int r;
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r = mfd_shared_platform_driver_register(&cs5535_pms_drv, "cs5535-pms");
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if (r)
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return r;
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r = mfd_shared_platform_driver_register(&cs5535_acpi_drv,
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"cs5535-acpi");
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if (r)
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mfd_shared_platform_driver_unregister(&cs5535_pms_drv);
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return r;
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}
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static void __exit olpc_xo1_exit(void)
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{
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mfd_shared_platform_driver_unregister(&cs5535_acpi_drv);
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mfd_shared_platform_driver_unregister(&cs5535_pms_drv);
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}
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MODULE_AUTHOR("Daniel Drake <dsd@laptop.org>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:cs5535-pms");
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module_init(olpc_xo1_init);
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module_exit(olpc_xo1_exit);
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