Configures the DIVIL component of the AMD CS5535 (Geode companion device).
This patch does the following:
- verifies the existence of the CS5535 by checking the DIVIL signature
- configures UART1 as a NS16550A
- (optionally) enables UART2 and configures it as a NS16550A
- (optionally) enables the SMBus/I2C interface
Signed-off-by: Ben Gardner <bgardner at wabtec.com>
-------------- next part --------------
arch/i386/Kconfig | 27 ++++++
arch/i386/kernel/Makefile | 8 +
arch/i386/kernel/cs5535.c | 190 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 225 insertions(+)
Index: linux-2.6.14/arch/i386/kernel/cs5535.c
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/i386/kernel/cs5535.c
@@ -0,0 +1,190 @@
+/**
+ * linux/arch/i386/kernel/cs5535.c
+ *
+ * Copyright (c) 2005 Ben Gardner <bgardner at wabtec.com>
+ *
+ * AMD CS5535 Companion Device support (AMD Geode processor).
+ *
+ * This does early configuration of the UARTs, SMB port, and GPIO.
+ *
+ * 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; version 2 of the License.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <asm/msr.h>
+#include <asm/io.h>
+
+
+#define NAME "cs5535"
+
+MODULE_AUTHOR("Ben Gardner <bgardner at wabtec.com>");
+MODULE_DESCRIPTION("AMD CS5535 Driver");
+MODULE_LICENSE("GPL");
+
+/* GPIO base address (from MSR_LBAR_GPIO; MSR 5140000Ch, bits 15:0) */
+u32 cs5535_gpio_base;
+u32 cs5535_gpio_mask;
+EXPORT_SYMBOL(cs5535_gpio_base);
+EXPORT_SYMBOL(cs5535_gpio_mask);
+
+#define MSR_DIVIL_GLD_CAP 0x51400000
+#define DEVID_DIVIL 0x2DF0
+
+#define MSR_LBAR_SMB 0x5140000B
+#define MSR_LBAR_GPIO 0x5140000C
+
+#define MSR_UART1_CONF 0x5140003a
+#define MSR_UART2_CONF 0x5140003e
+
+#define MSR_DIVIL_LEG_IO 0x51400014
+#define MSR_DIVIL_BALL_OPT 0x51400015
+#define MSR_IRQ_MAPY_H 0x51400021
+
+struct gpio_reg_val {
+ u32 reg;
+ u32 val;
+};
+
+#ifdef CS5535_SMB
+static const struct gpio_reg_val gpio_smb[] __initdata =
+{
+ { 0x04, 0x0000c000 }, /* enable OUTPUT */
+ { 0x08, 0x0000c000 }, /* enable OpenDrain */
+ { 0x10, 0x0000c000 }, /* enable OUT_AUX1 */
+ { 0x14, 0xc0000000UL }, /* disable OUT_AUX2 */
+ { 0x20, 0x0000c000 }, /* enable INPUT */
+ { 0x34, 0x0000c000 }, /* enable IN_AUX1 */
+};
+#endif
+
+/* don't touch GPIO 3 & 4 unless UART2 is enabled */
+#ifdef CS5535_UART2
+#define RMSK 0x03180318
+#else
+#define RMSK 0x03000300
+#endif
+
+static const struct gpio_reg_val gpio_uarts[] __initdata =
+{
+ { 0x00, 0x03180000 & RMSK }, /* output val */
+ { 0x04, 0x02080110 & RMSK }, /* output enable */
+ { 0x08, 0x02080110 & RMSK }, /* open-drain enable */
+ { 0x0c, 0x03180000 & RMSK }, /* invert output */
+ { 0x10, 0x02080110 & RMSK }, /* Out-Aux-1 */
+ { 0x14, 0x03180000 & RMSK }, /* Out-Aux-2 */
+ { 0x18, 0x03180000 & RMSK }, /* Pull-Up */
+ { 0x1c, 0x03180000 & RMSK }, /* Pull-Down */
+ { 0x20, 0x01100208 & RMSK }, /* Input enable */
+ { 0x24, 0x03180000 & RMSK }, /* invert */
+ { 0x28, 0x03180000 & RMSK }, /* filter */
+ { 0x2c, 0x03180000 & RMSK }, /* event-count */
+ { 0x34, 0x01100208 & RMSK }, /* in-aux1 */
+ { 0x38, 0x03180000 & RMSK }, /* events */
+ { 0x40, 0x03180000 & RMSK }, /* Input Pos Edge */
+ { 0x44, 0x03180000 & RMSK }, /* Input Neg Edge */
+};
+
+static int __init init_cs5535_divil(void)
+{
+ u32 low32;
+ u32 high32;
+ int idx;
+
+ /* Check the DIVIL device ID for validation */
+ rdmsr(MSR_DIVIL_GLD_CAP, low32, high32);
+ if ((high32 != 0) || ((low32 >> 8) != DEVID_DIVIL)) {
+ printk(KERN_WARNING NAME ": DIVIL device not found\n");
+ return -ENODEV;
+ }
+
+ /* Grab the GPIO I/O range */
+ rdmsr(MSR_LBAR_GPIO, low32, high32);
+ cs5535_gpio_base = low32 & 0x0000ff00;
+
+ /* Check the mask and whether GPIO is enabled */
+ if (high32 != 0x0000f001) {
+ /* TODO: enable GPIO IO mappings via LBAR */
+ printk(KERN_WARNING NAME ": GPIO not enabled\n");
+ return -ENODEV;
+ }
+
+ /* GPIO pins 31-29,23 are reserved, 22-16 are used for LPC,
+ * 9,8 are used for UART1 */
+ cs5535_gpio_mask = ~0xe0ff0300UL;
+
+#ifdef CS5535_SMB
+ /* GPIO pins 14 & 15 are used for SMBus */
+ cs5535_gpio_mask &= ~0x0000c000UL;
+
+ /* Grab & reserve the SMB I/O range */
+ rdmsr(MSR_LBAR_SMB, low32, high32);
+
+ /* Check the mask and whether SMB is enabled */
+ if (high32 != 0x0000F001) {
+ /* TODO: enable SMB IO mappings via LBAR */
+ printk(KERN_WARNING NAME ": SMBus not enabled\n");
+ return -ENODEV;
+ }
+
+ /* Configure GPIO 14 & 15 to do SMB/ACB/I2C */
+ for (idx = 0; idx < ARRAY_SIZE(gpio_smb); idx++) {
+ outl(gpio_smb[idx].val,
+ gpio_smb[idx].reg + cs5535_gpio_base);
+ }
+#endif /* CS5535_SMB */
+
+ /* Configure GPIO to do UART1 and maybe UART2 */
+ for (idx = 0; idx < ARRAY_SIZE(gpio_uarts); idx++) {
+ outl(gpio_uarts[idx].val,
+ gpio_uarts[idx].reg + cs5535_gpio_base);
+ }
+
+ /* Set UART1 base address to 0x3f8 */
+ rdmsr(MSR_DIVIL_LEG_IO, low32, high32);
+ low32 &= 0xfff8ffffUL; /* UART1 base IO */
+ low32 |= 0x00070000; /* 0x3F8 */
+ wrmsr(MSR_DIVIL_LEG_IO, low32, high32);
+
+ /* Set UART1 interrupt to 4 */
+ rdmsr(MSR_IRQ_MAPY_H, low32, high32);
+ low32 &= 0xf0ffffffUL; /* UART1 is on MAPY-14 */
+ low32 |= 0x04000000; /* IRQ 4 */
+ wrmsr(MSR_IRQ_MAPY_H, low32, high32);
+
+ /* Set up UART1 as a NS15560A */
+ wrmsr(MSR_UART1_CONF, 0x12, 0);
+
+#ifdef CS5535_UART2
+ /* GPIO pins 3 & 4 are used for UART2 */
+ cs5535_gpio_mask &= ~0x00000018UL;
+
+ /* Set UART2 base address to 0x2f8 */
+ rdmsr(MSR_DIVIL_LEG_IO, low32, high32);
+ low32 &= 0xff8fffffUL; /* UART2 base IO */
+ low32 |= 0x00500000; /* 0x2F8 */
+ wrmsr(MSR_DIVIL_LEG_IO, low32, high32);
+
+ /* Set UART1 interrupt to 3 */
+ rdmsr(MSR_IRQ_MAPY_H, low32, high32);
+ low32 &= 0x0fffffffUL; /* UART2 is on MAPY-15 */
+ low32 |= 0x30000000; /* IRQ 3 */
+ wrmsr(MSR_IRQ_MAPY_H, low32, high32);
+
+ /* Set up UART2 as a NS15560A */
+ wrmsr(MSR_UART2_CONF, 0x12, 0);
+#endif /* CS5535_UART2 */
+
+ printk(KERN_INFO NAME ": GPIO=%#x Mask=%#x\n",
+ cs5535_gpio_base, cs5535_gpio_mask);
+
+ return 0;
+}
+
+subsys_initcall(init_cs5535_divil);
+
Index: linux-2.6.14/arch/i386/Kconfig
===================================================================
--- linux-2.6.14.orig/arch/i386/Kconfig
+++ linux-2.6.14/arch/i386/Kconfig
@@ -336,6 +336,33 @@ config I8K
Say Y if you intend to run this kernel on a Dell Inspiron 8000.
Say N otherwise.
+config CS5535
+ tristate "AMD CS5535 (Geode Companion Device) support"
+ help
+ This provides basic support for the CS5535 Companion Chip for
+ the AMD Geode processor.
+
+ If you don't know what to do here, say N.
+
+config CS5535_SMB
+ bool "Enable CS5535 SMBus/Access.Bus/I2C"
+ depends on CS5535
+ default y
+ help
+ Choosing this will configure the CS5535 GPIO pins 14 & 15 for SMB.
+ Select I2C_CS5535 under i2c to build the SMB/I2C driver.
+
+ Say Y if you intend to use the SMBus.
+
+config CS5535_UART2
+ bool "Enable UART2"
+ depends on CS5535
+ default y
+ help
+ By default, CS5535 GPIO pins 3 & 4 are configured for DDC.
+
+ Say Y to configure them as UART2 instead.
+
config X86_REBOOTFIXUPS
bool "Enable X86 board specific fixups for reboot"
depends on X86
Index: linux-2.6.14/arch/i386/kernel/Makefile
===================================================================
--- linux-2.6.14.orig/arch/i386/kernel/Makefile
+++ linux-2.6.14/arch/i386/kernel/Makefile
@@ -42,6 +42,14 @@ EXTRA_AFLAGS := -traditional
obj-$(CONFIG_SCx200) += scx200.o
+obj-$(CONFIG_CS5535) += cs5535.o
+ifeq ($(CONFIG_CS5535_SMB), y)
+EXTRA_CFLAGS += -DCS5535_SMB
+endif
+ifeq ($(CONFIG_CS5535_UART2), y)
+EXTRA_CFLAGS += -DCS5535_UART2
+endif
+
# vsyscall.o contains the vsyscall DSO images as __initdata.
# We must build both images before we can assemble it.
# Note: kbuild does not track this dependency due to usage of .incbin
