davinci: DM646x: add base SoC and board support

Add support for DM646x SoC (a.k.a DaVinci HD) and its Evalution
Module (EVM.)

Original support done by Sudhakar Rajashekhara.

Signed-off-by: Sudhakar Rajashekhara <sudhakar.raj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 280 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/board-dm646x-evm.c b/arch/arm/mach-davinci/board-dm646x-evm.c
new file mode 100644
index 000000000000..94cb623b1ec9
--- /dev/null
+++ b/arch/arm/mach-davinci/board-dm646x-evm.c
@@ -0,0 +1,280 @@
+/*
+ * TI DaVinci DM646X EVM board
+ *
+ * Derived from: arch/arm/mach-davinci/board-evm.c
+ * Copyright (C) 2006 Texas Instruments.
+ *
+ * (C) 2007-2008, MontaVista Software, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2. This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ */
+
+/**************************************************************************
+ * Included Files
+ **************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/major.h>
+#include <linux/root_dev.h>
+#include <linux/dma-mapping.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/i2c/at24.h>
+#include <linux/i2c/pcf857x.h>
+#include <linux/etherdevice.h>
+
+#include <asm/setup.h>
+#include <asm/mach-types.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/flash.h>
+
+#include <mach/dm646x.h>
+#include <mach/common.h>
+#include <mach/psc.h>
+#include <mach/serial.h>
+#include <mach/i2c.h>
+
+static struct davinci_uart_config uart_config __initdata = {
+        .enabled_uarts = (1 << 0),
+};
+
+/* LEDS */
+
+static struct gpio_led evm_leds[] = {
+        { .name = "DS1", .active_low = 1, },
+        { .name = "DS2", .active_low = 1, },
+        { .name = "DS3", .active_low = 1, },
+        { .name = "DS4", .active_low = 1, },
+};
+
+static __initconst struct gpio_led_platform_data evm_led_data = {
+        .num_leds = ARRAY_SIZE(evm_leds),
+        .leds     = evm_leds,
+};
+
+static struct platform_device *evm_led_dev;
+
+static int evm_led_setup(struct i2c_client *client, int gpio,
+                        unsigned int ngpio, void *c)
+{
+        struct gpio_led *leds = evm_leds;
+        int status;
+
+        while (ngpio--) {
+                leds->gpio = gpio++;
+                leds++;
+        };
+
+        evm_led_dev = platform_device_alloc("leds-gpio", 0);
+        platform_device_add_data(evm_led_dev, &evm_led_data,
+                                sizeof(evm_led_data));
+
+        evm_led_dev->dev.parent = &client->dev;
+        status = platform_device_add(evm_led_dev);
+        if (status < 0) {
+                platform_device_put(evm_led_dev);
+                evm_led_dev = NULL;
+        }
+        return status;
+}
+
+static int evm_led_teardown(struct i2c_client *client, int gpio,
+                                unsigned ngpio, void *c)
+{
+        if (evm_led_dev) {
+                platform_device_unregister(evm_led_dev);
+                evm_led_dev = NULL;
+        }
+        return 0;
+}
+
+static int evm_sw_gpio[4] = { -EINVAL, -EINVAL, -EINVAL, -EINVAL };
+
+static int evm_sw_setup(struct i2c_client *client, int gpio,
+                        unsigned ngpio, void *c)
+{
+        int status;
+        int i;
+        char label[10];
+
+        for (i = 0; i < 4; ++i) {
+                snprintf(label, 10, "user_sw%d", i);
+                status = gpio_request(gpio, label);
+                if (status)
+                        goto out_free;
+                evm_sw_gpio[i] = gpio++;
+
+                status = gpio_direction_input(evm_sw_gpio[i]);
+                if (status) {
+                        gpio_free(evm_sw_gpio[i]);
+                        evm_sw_gpio[i] = -EINVAL;
+                        goto out_free;
+                }
+
+                status = gpio_export(evm_sw_gpio[i], 0);
+                if (status) {
+                        gpio_free(evm_sw_gpio[i]);
+                        evm_sw_gpio[i] = -EINVAL;
+                        goto out_free;
+                }
+        }
+        return status;
+out_free:
+        for (i = 0; i < 4; ++i) {
+                if (evm_sw_gpio[i] != -EINVAL) {
+                        gpio_free(evm_sw_gpio[i]);
+                        evm_sw_gpio[i] = -EINVAL;
+                }
+        }
+        return status;
+}
+
+static int evm_sw_teardown(struct i2c_client *client, int gpio,
+                        unsigned ngpio, void *c)
+{
+        int i;
+
+        for (i = 0; i < 4; ++i) {
+                if (evm_sw_gpio[i] != -EINVAL) {
+                        gpio_unexport(evm_sw_gpio[i]);
+                        gpio_free(evm_sw_gpio[i]);
+                        evm_sw_gpio[i] = -EINVAL;
+                }
+        }
+        return 0;
+}
+
+static int evm_pcf_setup(struct i2c_client *client, int gpio,
+                        unsigned int ngpio, void *c)
+{
+        int status;
+
+        if (ngpio < 8)
+                return -EINVAL;
+
+        status = evm_sw_setup(client, gpio, 4, c);
+        if (status)
+                return status;
+
+        return evm_led_setup(client, gpio+4, 4, c);
+}
+
+static int evm_pcf_teardown(struct i2c_client *client, int gpio,
+                        unsigned int ngpio, void *c)
+{
+        BUG_ON(ngpio < 8);
+
+        evm_sw_teardown(client, gpio, 4, c);
+        evm_led_teardown(client, gpio+4, 4, c);
+
+        return 0;
+}
+
+static struct pcf857x_platform_data pcf_data = {
+        .gpio_base      = DAVINCI_N_GPIO+1,
+        .setup          = evm_pcf_setup,
+        .teardown       = evm_pcf_teardown,
+};
+
+/* Most of this EEPROM is unused, but U-Boot uses some data:
+ *  - 0x7f00, 6 bytes Ethernet Address
+ *  - ... newer boards may have more
+ */
+static struct memory_accessor *at24_mem_acc;
+
+static void at24_setup(struct memory_accessor *mem_acc, void *context)
+{
+        char mac_addr[6];
+
+        at24_mem_acc = mem_acc;
+
+        /* Read MAC addr from EEPROM */
+        if (at24_mem_acc->read(at24_mem_acc, mac_addr, 0x7f00, ETH_ALEN) ==
+            ETH_ALEN)
+                pr_info("Read MAC addr from EEPROM: %pM\n", mac_addr);
+}
+
+static struct at24_platform_data eeprom_info = {
+        .byte_len       = (256*1024) / 8,
+        .page_size      = 64,
+        .flags          = AT24_FLAG_ADDR16,
+        .setup          = at24_setup,
+};
+
+int dm646xevm_eeprom_read(void *buf, off_t off, size_t count)
+{
+        if (at24_mem_acc)
+                return at24_mem_acc->read(at24_mem_acc, buf, off, count);
+        return -ENODEV;
+}
+EXPORT_SYMBOL(dm646xevm_eeprom_read);
+
+int dm646xevm_eeprom_write(void *buf, off_t off, size_t count)
+{
+        if (at24_mem_acc)
+                return at24_mem_acc->write(at24_mem_acc, buf, off, count);
+        return -ENODEV;
+}
+EXPORT_SYMBOL(dm646xevm_eeprom_write);
+
+static struct i2c_board_info __initdata i2c_info[] =  {
+        {
+                I2C_BOARD_INFO("24c256", 0x50),
+                .platform_data  = &eeprom_info,
+        },
+        {
+                I2C_BOARD_INFO("pcf8574a", 0x38),
+                .platform_data  = &pcf_data,
+        },
+};
+
+static struct davinci_i2c_platform_data i2c_pdata = {
+        .bus_freq       = 100 /* kHz */,
+        .bus_delay      = 0 /* usec */,
+};
+
+static void __init evm_init_i2c(void)
+{
+        davinci_init_i2c(&i2c_pdata);
+        i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
+}
+
+static void __init davinci_map_io(void)
+{
+        davinci_map_common_io();
+        dm646x_init();
+}
+
+static __init void evm_init(void)
+{
+        evm_init_i2c();
+        davinci_serial_init(&uart_config);
+}
+
+static __init void davinci_dm646x_evm_irq_init(void)
+{
+        davinci_irq_init();
+}
+
+MACHINE_START(DAVINCI_DM6467_EVM, "DaVinci DM646x EVM")
+        .phys_io      = IO_PHYS,
+        .io_pg_offst  = (__IO_ADDRESS(IO_PHYS) >> 18) & 0xfffc,
+        .boot_params  = (0x80000100),
+        .map_io       = davinci_map_io,
+        .init_irq     = davinci_dm646x_evm_irq_init,
+        .timer        = &davinci_timer,
+        .init_machine = evm_init,
+MACHINE_END
+