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author | Andres Salomon <dilinger@queued.net> | 2007-07-21 15:11:38 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-22 01:37:14 (GMT) |
commit | f62e518484e9b16a0eca013e8a6764bc4f56d5fe (patch) | |
tree | 153ec5c1e5c83f2127b4102e849d6705652bb839 /arch/i386 | |
parent | 5a3ece79b2aa9e71ed67689c97b3bda6135f7248 (diff) | |
download | linux-fsl-qoriq-f62e518484e9b16a0eca013e8a6764bc4f56d5fe.tar.xz |
i386: basic infrastructure support for AMD geode-class machines
This builds upon the existing geode infrastructure, but adds southbridge
support, some GPIO functions, and a header file (asm-i386/geode.h) with some
useful GX/LX detection tests.
The majority of this code was written by Jordan Crouse.
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386')
-rw-r--r-- | arch/i386/kernel/Makefile | 1 | ||||
-rw-r--r-- | arch/i386/kernel/geode.c | 155 |
2 files changed, 156 insertions, 0 deletions
diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile index 06da59f..dbe5e87 100644 --- a/arch/i386/kernel/Makefile +++ b/arch/i386/kernel/Makefile @@ -40,6 +40,7 @@ obj-$(CONFIG_VM86) += vm86.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_HPET_TIMER) += hpet.o obj-$(CONFIG_K8_NB) += k8.o +obj-$(CONFIG_MGEODE_LX) += geode.o obj-$(CONFIG_VMI) += vmi.o vmiclock.o obj-$(CONFIG_PARAVIRT) += paravirt.o diff --git a/arch/i386/kernel/geode.c b/arch/i386/kernel/geode.c new file mode 100644 index 0000000..41e8aec --- /dev/null +++ b/arch/i386/kernel/geode.c @@ -0,0 +1,155 @@ +/* + * AMD Geode southbridge support code + * Copyright (C) 2006, Advanced Micro Devices, Inc. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of version 2 of the GNU General Public License + * as published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/ioport.h> +#include <linux/io.h> +#include <asm/msr.h> +#include <asm/geode.h> + +static struct { + char *name; + u32 msr; + int size; + u32 base; +} lbars[] = { + { "geode-pms", MSR_LBAR_PMS, LBAR_PMS_SIZE, 0 }, + { "geode-acpi", MSR_LBAR_ACPI, LBAR_ACPI_SIZE, 0 }, + { "geode-gpio", MSR_LBAR_GPIO, LBAR_GPIO_SIZE, 0 }, + { "geode-mfgpt", MSR_LBAR_MFGPT, LBAR_MFGPT_SIZE, 0 } +}; + +static void __init init_lbars(void) +{ + u32 lo, hi; + int i; + + for (i = 0; i < ARRAY_SIZE(lbars); i++) { + rdmsr(lbars[i].msr, lo, hi); + if (hi & 0x01) + lbars[i].base = lo & 0x0000ffff; + + if (lbars[i].base == 0) + printk(KERN_ERR "geode: Couldn't initialize '%s'\n", + lbars[i].name); + } +} + +int geode_get_dev_base(unsigned int dev) +{ + BUG_ON(dev >= ARRAY_SIZE(lbars)); + return lbars[dev].base; +} +EXPORT_SYMBOL_GPL(geode_get_dev_base); + +/* === GPIO API === */ + +void geode_gpio_set(unsigned int gpio, unsigned int reg) +{ + u32 base = geode_get_dev_base(GEODE_DEV_GPIO); + + if (!base) + return; + + if (gpio < 16) + outl(1 << gpio, base + reg); + else + outl(1 << (gpio - 16), base + 0x80 + reg); +} +EXPORT_SYMBOL_GPL(geode_gpio_set); + +void geode_gpio_clear(unsigned int gpio, unsigned int reg) +{ + u32 base = geode_get_dev_base(GEODE_DEV_GPIO); + + if (!base) + return; + + if (gpio < 16) + outl(1 << (gpio + 16), base + reg); + else + outl(1 << gpio, base + 0x80 + reg); +} +EXPORT_SYMBOL_GPL(geode_gpio_clear); + +int geode_gpio_isset(unsigned int gpio, unsigned int reg) +{ + u32 base = geode_get_dev_base(GEODE_DEV_GPIO); + + if (!base) + return 0; + + if (gpio < 16) + return (inl(base + reg) & (1 << gpio)) ? 1 : 0; + else + return (inl(base + 0x80 + reg) & (1 << (gpio - 16))) ? 1 : 0; +} +EXPORT_SYMBOL_GPL(geode_gpio_isset); + +void geode_gpio_set_irq(unsigned int group, unsigned int irq) +{ + u32 lo, hi; + + if (group > 7 || irq > 15) + return; + + rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi); + + lo &= ~(0xF << (group * 4)); + lo |= (irq & 0xF) << (group * 4); + + wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi); +} +EXPORT_SYMBOL_GPL(geode_gpio_set_irq); + +void geode_gpio_setup_event(unsigned int gpio, int pair, int pme) +{ + u32 base = geode_get_dev_base(GEODE_DEV_GPIO); + u32 offset, shift, val; + + if (gpio >= 24) + offset = GPIO_MAP_W; + else if (gpio >= 16) + offset = GPIO_MAP_Z; + else if (gpio >= 8) + offset = GPIO_MAP_Y; + else + offset = GPIO_MAP_X; + + shift = (gpio % 8) * 4; + + val = inl(base + offset); + + /* Clear whatever was there before */ + val &= ~(0xF << shift); + + /* And set the new value */ + + val |= ((pair & 7) << shift); + + /* Set the PME bit if this is a PME event */ + + if (pme) + val |= (1 << (shift + 3)); + + outl(val, base + offset); +} +EXPORT_SYMBOL_GPL(geode_gpio_setup_event); + +static int __init geode_southbridge_init(void) +{ + if (!is_geode()) + return -ENODEV; + + init_lbars(); + return 0; +} + +postcore_initcall(geode_southbridge_init); |