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>

2 files changed, 156 insertions, 0 deletions

diff --git a/arch/i386/kernel/Makefile b/arch/i386/kernel/Makefile
index 06da59f6f837..dbe5e87e0d66 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 000000000000..41e8aec4c61d
--- /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);