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Merge branch 'x86-olpc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'x86-olpc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, olpc: XO-1 uses/depends on PCI
  x86, olpc: Register XO-1 platform devices
  x86, olpc: Add XO-1 poweroff support
  x86, olpc: Don't retry EC commands forever
  x86, olpc: Rework BIOS signature check
  x86, olpc: Only enable PCI configuration type override on XO-1
This commit is contained in:
Linus Torvalds 2010-10-21 13:52:01 -07:00
commit cca8209ed9
7 changed files with 217 additions and 38 deletions
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11
arch/x86/Kconfig
View File

@ -1927,7 +1927,7 @@ config PCI_GODIRECT
bool "Direct"
config PCI_GOOLPC
bool "OLPC"
bool "OLPC XO-1"
depends on OLPC
config PCI_GOANY
@ -2088,14 +2088,21 @@ config SCx200HR_TIMER
config OLPC
bool "One Laptop Per Child support"
select GPIOLIB
select OLPC_OPENFIRMWARE
---help---
Add support for detecting the unique features of the OLPC
XO hardware.
config OLPC_XO1
tristate "OLPC XO-1 support"
depends on OLPC && PCI
---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
default y if OLPC
default n
help
This option adds support for the implementation of Open Firmware
that is used on the OLPC XO-1 Children's Machine.

4
arch/x86/include/asm/olpc_ofw.h
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@ -21,10 +21,14 @@ extern void olpc_ofw_detect(void);
/* install OFW's pde permanently into the kernel's pgtable */
extern void setup_olpc_ofw_pgd(void);
/* check if OFW was detected during boot */
extern bool olpc_ofw_present(void);
#else /* !CONFIG_OLPC_OPENFIRMWARE */
static inline void olpc_ofw_detect(void) { }
static inline void setup_olpc_ofw_pgd(void) { }
static inline bool olpc_ofw_present(void) { return false; }
#endif /* !CONFIG_OLPC_OPENFIRMWARE */

1
arch/x86/kernel/Makefile
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@ -108,6 +108,7 @@ 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

140
arch/x86/kernel/olpc-xo1.c Normal file
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@ -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);

91
arch/x86/kernel/olpc.c
View File

@ -17,6 +17,7 @@
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <asm/geode.h>
#include <asm/setup.h>
@ -114,6 +115,7 @@ int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
unsigned long flags;
int ret = -EIO;
int i;
int restarts = 0;
spin_lock_irqsave(&ec_lock, flags);
@ -169,7 +171,9 @@ int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
if (wait_on_obf(0x6c, 1)) {
printk(KERN_ERR "olpc-ec: timeout waiting for"
" EC to provide data!\n");
goto restart;
if (restarts++ < 10)
goto restart;
goto err;
}
outbuf[i] = inb(0x68);
pr_devel("olpc-ec: received 0x%x\n", outbuf[i]);
@ -183,8 +187,21 @@ int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen,
}
EXPORT_SYMBOL_GPL(olpc_ec_cmd);
#ifdef CONFIG_OLPC_OPENFIRMWARE
static void __init platform_detect(void)
static bool __init check_ofw_architecture(void)
{
size_t propsize;
char olpc_arch[5];
const void *args[] = { NULL, "architecture", olpc_arch, (void *)5 };
void *res[] = { &propsize };
if (olpc_ofw("getprop", args, res)) {
printk(KERN_ERR "ofw: getprop call failed!\n");
return false;
}
return propsize == 5 && strncmp("OLPC", olpc_arch, 5) == 0;
}
static u32 __init get_board_revision(void)
{
size_t propsize;
__be32 rev;
@ -193,46 +210,44 @@ static void __init platform_detect(void)
if (olpc_ofw("getprop", args, res) || propsize != 4) {
printk(KERN_ERR "ofw: getprop call failed!\n");
rev = cpu_to_be32(0);
return cpu_to_be32(0);
}
olpc_platform_info.boardrev = be32_to_cpu(rev);
return be32_to_cpu(rev);
}
#else
static void __init platform_detect(void)
static bool __init platform_detect(void)
{
/* stopgap until OFW support is added to the kernel */
olpc_platform_info.boardrev = olpc_board(0xc2);
if (!check_ofw_architecture())
return false;
olpc_platform_info.flags |= OLPC_F_PRESENT;
olpc_platform_info.boardrev = get_board_revision();
return true;
}
static int __init add_xo1_platform_devices(void)
{
struct platform_device *pdev;
pdev = platform_device_register_simple("xo1-rfkill", -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
pdev = platform_device_register_simple("olpc-xo1", -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
return 0;
}
#endif
static int __init olpc_init(void)
{
unsigned char *romsig;
int r = 0;
/* The ioremap check is dangerous; limit what we run it on */
if (!is_geode() || cs5535_has_vsa2())
if (!olpc_ofw_present() || !platform_detect())
return 0;
spin_lock_init(&ec_lock);
romsig = ioremap(0xffffffc0, 16);
if (!romsig)
return 0;
if (strncmp(romsig, "CL1 Q", 7))
goto unmap;
if (strncmp(romsig+6, romsig+13, 3)) {
printk(KERN_INFO "OLPC BIOS signature looks invalid. "
"Assuming not OLPC\n");
goto unmap;
}
printk(KERN_INFO "OLPC board with OpenFirmware %.16s\n", romsig);
olpc_platform_info.flags |= OLPC_F_PRESENT;
/* get the platform revision */
platform_detect();
/* assume B1 and above models always have a DCON */
if (olpc_board_at_least(olpc_board(0xb1)))
olpc_platform_info.flags |= OLPC_F_DCON;
@ -242,8 +257,10 @@ static int __init olpc_init(void)
(unsigned char *) &olpc_platform_info.ecver, 1);
#ifdef CONFIG_PCI_OLPC
/* If the VSA exists let it emulate PCI, if not emulate in kernel */
if (!cs5535_has_vsa2())
/* If the VSA exists let it emulate PCI, if not emulate in kernel.
* XO-1 only. */
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0) &&
!cs5535_has_vsa2())
x86_init.pci.arch_init = pci_olpc_init;
#endif
@ -252,8 +269,12 @@ static int __init olpc_init(void)
olpc_platform_info.boardrev >> 4,
olpc_platform_info.ecver);
unmap:
iounmap(romsig);
if (olpc_platform_info.boardrev < olpc_board_pre(0xd0)) { /* XO-1 */
r = add_xo1_platform_devices();
if (r)
return r;
}
return 0;
}

6
arch/x86/kernel/olpc_ofw.c
View File

@ -74,6 +74,12 @@ int __olpc_ofw(const char *name, int nr_args, const void **args, int nr_res,
}
EXPORT_SYMBOL_GPL(__olpc_ofw);
bool olpc_ofw_present(void)
{
return olpc_ofw_cif != NULL;
}
EXPORT_SYMBOL_GPL(olpc_ofw_present);
/* OFW cif _should_ be above this address */
#define OFW_MIN 0xff000000

2
arch/x86/pci/olpc.c
View File

@ -304,7 +304,7 @@ static struct pci_raw_ops pci_olpc_conf = {
int __init pci_olpc_init(void)
{
printk(KERN_INFO "PCI: Using configuration type OLPC\n");
printk(KERN_INFO "PCI: Using configuration type OLPC XO-1\n");
raw_pci_ops = &pci_olpc_conf;
is_lx = is_geode_lx();
return 0;