175 lines
3.4 KiB
C
175 lines
3.4 KiB
C
/*
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* AMD Geode southbridge support code
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* Copyright (C) 2006, Advanced Micro Devices, Inc.
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* Copyright (C) 2007, Andres Salomon <dilinger@debian.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public License
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* as published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <asm/msr.h>
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#include <asm/geode.h>
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static struct {
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char *name;
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u32 msr;
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int size;
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u32 base;
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} lbars[] = {
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{ "geode-pms", MSR_LBAR_PMS, LBAR_PMS_SIZE, 0 },
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{ "geode-acpi", MSR_LBAR_ACPI, LBAR_ACPI_SIZE, 0 },
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{ "geode-gpio", MSR_LBAR_GPIO, LBAR_GPIO_SIZE, 0 },
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{ "geode-mfgpt", MSR_LBAR_MFGPT, LBAR_MFGPT_SIZE, 0 }
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};
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static void __init init_lbars(void)
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{
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u32 lo, hi;
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int i;
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for (i = 0; i < ARRAY_SIZE(lbars); i++) {
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rdmsr(lbars[i].msr, lo, hi);
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if (hi & 0x01)
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lbars[i].base = lo & 0x0000ffff;
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if (lbars[i].base == 0)
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printk(KERN_ERR "geode: Couldn't initialize '%s'\n",
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lbars[i].name);
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}
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}
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int geode_get_dev_base(unsigned int dev)
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{
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BUG_ON(dev >= ARRAY_SIZE(lbars));
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return lbars[dev].base;
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}
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EXPORT_SYMBOL_GPL(geode_get_dev_base);
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/* === GPIO API === */
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void geode_gpio_set(u32 gpio, unsigned int reg)
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{
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u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
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if (!base)
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return;
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/* low bank register */
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if (gpio & 0xFFFF)
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outl(gpio & 0xFFFF, base + reg);
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/* high bank register */
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gpio >>= 16;
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if (gpio)
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outl(gpio, base + 0x80 + reg);
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}
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EXPORT_SYMBOL_GPL(geode_gpio_set);
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void geode_gpio_clear(u32 gpio, unsigned int reg)
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{
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u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
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if (!base)
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return;
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/* low bank register */
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if (gpio & 0xFFFF)
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outl((gpio & 0xFFFF) << 16, base + reg);
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/* high bank register */
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gpio &= (0xFFFF << 16);
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if (gpio)
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outl(gpio, base + 0x80 + reg);
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}
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EXPORT_SYMBOL_GPL(geode_gpio_clear);
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int geode_gpio_isset(u32 gpio, unsigned int reg)
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{
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u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
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u32 val;
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if (!base)
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return 0;
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/* low bank register */
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if (gpio & 0xFFFF) {
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val = inl(base + reg) & (gpio & 0xFFFF);
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if ((gpio & 0xFFFF) == val)
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return 1;
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}
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/* high bank register */
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gpio >>= 16;
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if (gpio) {
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val = inl(base + 0x80 + reg) & gpio;
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if (gpio == val)
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(geode_gpio_isset);
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void geode_gpio_set_irq(unsigned int group, unsigned int irq)
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{
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u32 lo, hi;
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if (group > 7 || irq > 15)
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return;
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rdmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
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lo &= ~(0xF << (group * 4));
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lo |= (irq & 0xF) << (group * 4);
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wrmsr(MSR_PIC_ZSEL_HIGH, lo, hi);
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}
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EXPORT_SYMBOL_GPL(geode_gpio_set_irq);
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void geode_gpio_setup_event(unsigned int gpio, int pair, int pme)
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{
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u32 base = geode_get_dev_base(GEODE_DEV_GPIO);
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u32 offset, shift, val;
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if (gpio >= 24)
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offset = GPIO_MAP_W;
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else if (gpio >= 16)
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offset = GPIO_MAP_Z;
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else if (gpio >= 8)
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offset = GPIO_MAP_Y;
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else
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offset = GPIO_MAP_X;
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shift = (gpio % 8) * 4;
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val = inl(base + offset);
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/* Clear whatever was there before */
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val &= ~(0xF << shift);
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/* And set the new value */
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val |= ((pair & 7) << shift);
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/* Set the PME bit if this is a PME event */
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if (pme)
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val |= (1 << (shift + 3));
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outl(val, base + offset);
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}
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EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
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static int __init geode_southbridge_init(void)
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{
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if (!is_geode())
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return -ENODEV;
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init_lbars();
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(void) mfgpt_timer_setup();
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return 0;
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}
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postcore_initcall(geode_southbridge_init);
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