ARM: DaVinci: evm sets up many devices

Update DaVinci EVM board setup to work with key drivers which are
now in mainline kernels:

 - I2C adapter (driver: i2c_davinci)
    * three gpio expanders (driver: pcf8574) used for
       - LEDs
       - audio codec control
       - misc device control (including USB VBUS, IDE-vs-CF)
    * at24 (driver: at24) eeprom
 - USB controller (driver: musb_hdrc)
 - IDE controller (driver: palm_bk3710)

This board is the first in-tree client for a number of those drivers,
and adding this board support means the EVM board can be used for some
"real work" ... excepting "DaVinci Technology" video and DSP support
(also available in most OMAP3 chips).

Also renames the flash as "evm_norflash", since NAND may be jumpered.

(Patch contains work by myself, Kevin Hilman, Sergei Shtylyov.)

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Sergei Shtylyov  <sshtylyov@ru.mvista.com>

1 files changed, 322 insertions, 15 deletions

diff --git a/arch/arm/mach-davinci/board-evm.c b/arch/arm/mach-davinci/board-evm.c
index 2db7b7850fb5..9581675f6586 100644
--- a/arch/arm/mach-davinci/board-evm.c
+++ b/arch/arm/mach-davinci/board-evm.c
@@ -13,6 +13,13 @@
 #include <linux/init.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c/pcf857x.h>
+#include <linux/i2c/at24.h>
+
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/physmap.h>
@@ -20,13 +27,14 @@
 #include <asm/setup.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
-#include <mach/hardware.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/mach/flash.h>
 
+#include <mach/hardware.h>
 #include <mach/common.h>
+#include <mach/i2c.h>
 
 /* other misc. init functions */
 void __init davinci_psc_init(void);
@@ -34,10 +42,10 @@ void __init davinci_irq_init(void);
 void __init davinci_map_common_io(void);
 void __init davinci_init_common_hw(void);
 
-/* NOR Flash base address set to CS0 by default */
-#define NOR_FLASH_PHYS 0x02000000
+#if defined(CONFIG_MTD_PHYSMAP) || \
+    defined(CONFIG_MTD_PHYSMAP_MODULE)
 
-static struct mtd_partition davinci_evm_partitions[] = {
+static struct mtd_partition davinci_evm_norflash_partitions[] = {
         /* bootloader (U-Boot, etc) in first 4 sectors */
         {
                 .name           = "bootloader",
@@ -68,32 +76,323 @@ static struct mtd_partition davinci_evm_partitions[] = {
         }
 };
 
-static struct physmap_flash_data davinci_evm_flash_data = {
+static struct physmap_flash_data davinci_evm_norflash_data = {
         .width          = 2,
-        .parts          = davinci_evm_partitions,
-        .nr_parts       = ARRAY_SIZE(davinci_evm_partitions),
+        .parts          = davinci_evm_norflash_partitions,
+        .nr_parts       = ARRAY_SIZE(davinci_evm_norflash_partitions),
 };
 
 /* NOTE: CFI probe will correctly detect flash part as 32M, but EMIF
  * limits addresses to 16M, so using addresses past 16M will wrap */
-static struct resource davinci_evm_flash_resource = {
-        .start          = NOR_FLASH_PHYS,
-        .end            = NOR_FLASH_PHYS + SZ_16M - 1,
+static struct resource davinci_evm_norflash_resource = {
+        .start          = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE,
+        .end            = DAVINCI_ASYNC_EMIF_DATA_CE0_BASE + SZ_16M - 1,
         .flags          = IORESOURCE_MEM,
 };
 
-static struct platform_device davinci_evm_flash_device = {
+static struct platform_device davinci_evm_norflash_device = {
         .name           = "physmap-flash",
         .id             = 0,
         .dev            = {
-                .platform_data  = &davinci_evm_flash_data,
+                .platform_data  = &davinci_evm_norflash_data,
         },
         .num_resources  = 1,
-        .resource       = &davinci_evm_flash_resource,
+        .resource       = &davinci_evm_norflash_resource,
+};
+
+#endif
+
+#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
+    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
+
+static struct resource ide_resources[] = {
+        {
+                .start          = DAVINCI_CFC_ATA_BASE,
+                .end            = DAVINCI_CFC_ATA_BASE + 0x7ff,
+                .flags          = IORESOURCE_MEM,
+        },
+        {
+                .start          = IRQ_IDE,
+                .end            = IRQ_IDE,
+                .flags          = IORESOURCE_IRQ,
+        },
+};
+
+static u64 ide_dma_mask = DMA_32BIT_MASK;
+
+static struct platform_device ide_dev = {
+        .name           = "palm_bk3710",
+        .id             = -1,
+        .resource       = ide_resources,
+        .num_resources  = ARRAY_SIZE(ide_resources),
+        .dev = {
+                .dma_mask               = &ide_dma_mask,
+                .coherent_dma_mask      = DMA_32BIT_MASK,
+        },
+};
+
+#endif
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * I2C GPIO expanders
+ */
+
+#define PCF_Uxx_BASE(x) (DAVINCI_N_GPIO + ((x) * 8))
+
+
+/* U2 -- LEDs */
+
+static struct gpio_led evm_leds[] = {
+        { .name = "DS8", .active_low = 1,
+                .default_trigger = "heartbeat", },
+        { .name = "DS7", .active_low = 1, },
+        { .name = "DS6", .active_low = 1, },
+        { .name = "DS5", .active_low = 1, },
+        { .name = "DS4", .active_low = 1, },
+        { .name = "DS3", .active_low = 1, },
+        { .name = "DS2", .active_low = 1,
+                .default_trigger = "mmc0", },
+        { .name = "DS1", .active_low = 1,
+                .default_trigger = "ide-disk", },
+};
+
+static const 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 ngpio, void *c)
+{
+        struct gpio_led *leds = evm_leds;
+        int status;
+
+        while (ngpio--) {
+                leds->gpio = gpio++;
+                leds++;
+        }
+
+        /* what an extremely annoying way to be forced to handle
+         * device unregistration ...
+         */
+        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 struct pcf857x_platform_data pcf_data_u2 = {
+        .gpio_base      = PCF_Uxx_BASE(0),
+        .setup          = evm_led_setup,
+        .teardown       = evm_led_teardown,
+};
+
+
+/* U18 - A/V clock generator and user switch */
+
+static int sw_gpio;
+
+static ssize_t
+sw_show(struct device *d, struct device_attribute *a, char *buf)
+{
+        char *s = gpio_get_value_cansleep(sw_gpio) ? "on\n" : "off\n";
+
+        strcpy(buf, s);
+        return strlen(s);
+}
+
+static DEVICE_ATTR(user_sw, S_IRUGO, sw_show, NULL);
+
+static int
+evm_u18_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
+{
+        int     status;
+
+        /* export dip switch option */
+        sw_gpio = gpio + 7;
+        status = gpio_request(sw_gpio, "user_sw");
+        if (status == 0)
+                status = gpio_direction_input(sw_gpio);
+        if (status == 0)
+                status = device_create_file(&client->dev, &dev_attr_user_sw);
+        else
+                gpio_free(sw_gpio);
+        if (status != 0)
+                sw_gpio = -EINVAL;
+
+        /* audio PLL:  48 kHz (vs 44.1 or 32), single rate (vs double) */
+        gpio_request(gpio + 3, "pll_fs2");
+        gpio_direction_output(gpio + 3, 0);
+
+        gpio_request(gpio + 2, "pll_fs1");
+        gpio_direction_output(gpio + 2, 0);
+
+        gpio_request(gpio + 1, "pll_sr");
+        gpio_direction_output(gpio + 1, 0);
+
+        return 0;
+}
+
+static int
+evm_u18_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
+{
+        gpio_free(gpio + 1);
+        gpio_free(gpio + 2);
+        gpio_free(gpio + 3);
+
+        if (sw_gpio > 0) {
+                device_remove_file(&client->dev, &dev_attr_user_sw);
+                gpio_free(sw_gpio);
+        }
+        return 0;
+}
+
+static struct pcf857x_platform_data pcf_data_u18 = {
+        .gpio_base      = PCF_Uxx_BASE(1),
+        .n_latch        = (1 << 3) | (1 << 2) | (1 << 1),
+        .setup          = evm_u18_setup,
+        .teardown       = evm_u18_teardown,
 };
 
+
+/* U35 - various I/O signals used to manage USB, CF, ATA, etc */
+
+static int
+evm_u35_setup(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
+{
+        /* p0 = nDRV_VBUS (initial:  don't supply it) */
+        gpio_request(gpio + 0, "nDRV_VBUS");
+        gpio_direction_output(gpio + 0, 1);
+
+        /* p1 = VDDIMX_EN */
+        gpio_request(gpio + 1, "VDDIMX_EN");
+        gpio_direction_output(gpio + 1, 1);
+
+        /* p2 = VLYNQ_EN */
+        gpio_request(gpio + 2, "VLYNQ_EN");
+        gpio_direction_output(gpio + 2, 1);
+
+        /* p3 = n3V3_CF_RESET (initial: stay in reset) */
+        gpio_request(gpio + 3, "nCF_RESET");
+        gpio_direction_output(gpio + 3, 0);
+
+        /* (p4 unused) */
+
+        /* p5 = 1V8_WLAN_RESET (initial: stay in reset) */
+        gpio_request(gpio + 5, "WLAN_RESET");
+        gpio_direction_output(gpio + 5, 1);
+
+        /* p6 = nATA_SEL (initial: select) */
+        gpio_request(gpio + 6, "nATA_SEL");
+        gpio_direction_output(gpio + 6, 0);
+
+        /* p7 = nCF_SEL (initial: deselect) */
+        gpio_request(gpio + 7, "nCF_SEL");
+        gpio_direction_output(gpio + 7, 1);
+
+        return 0;
+}
+
+static int
+evm_u35_teardown(struct i2c_client *client, int gpio, unsigned ngpio, void *c)
+{
+        gpio_free(gpio + 7);
+        gpio_free(gpio + 6);
+        gpio_free(gpio + 5);
+        gpio_free(gpio + 3);
+        gpio_free(gpio + 2);
+        gpio_free(gpio + 1);
+        gpio_free(gpio + 0);
+        return 0;
+}
+
+static struct pcf857x_platform_data pcf_data_u35 = {
+        .gpio_base      = PCF_Uxx_BASE(2),
+        .setup          = evm_u35_setup,
+        .teardown       = evm_u35_teardown,
+};
+
+/*----------------------------------------------------------------------*/
+
+/* Most of this EEPROM is unused, but U-Boot uses some data:
+ *  - 0x7f00, 6 bytes Ethernet Address
+ *  - 0x0039, 1 byte NTSC vs PAL (bit 0x80 == PAL)
+ *  - ... newer boards may have more
+ */
+static struct at24_platform_data eeprom_info = {
+        .byte_len       = (256*1024) / 8,
+        .page_size      = 64,
+        .flags          = AT24_FLAG_ADDR16,
+};
+
+static struct i2c_board_info __initdata i2c_info[] =  {
+        {
+                I2C_BOARD_INFO("pcf8574", 0x38),
+                .platform_data  = &pcf_data_u2,
+        },
+        {
+                I2C_BOARD_INFO("pcf8574", 0x39),
+                .platform_data  = &pcf_data_u18,
+        },
+        {
+                I2C_BOARD_INFO("pcf8574", 0x3a),
+                .platform_data  = &pcf_data_u35,
+        },
+        {
+                I2C_BOARD_INFO("24c256", 0x50),
+                .platform_data  = &eeprom_info,
+        },
+        /* ALSO:
+         * - tvl320aic33 audio codec (0x1b)
+         * - msp430 microcontroller (0x23)
+         * - tvp5146 video decoder (0x5d)
+         */
+};
+
+/* The msp430 uses a slow bitbanged I2C implementation (ergo 20 KHz),
+ * which requires 100 usec of idle bus after i2c writes sent to it.
+ */
+static struct davinci_i2c_platform_data i2c_pdata = {
+        .bus_freq       = 20 /* kHz */,
+        .bus_delay      = 100 /* 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 struct platform_device *davinci_evm_devices[] __initdata = {
-        &davinci_evm_flash_device,
+#if defined(CONFIG_MTD_PHYSMAP) || \
+    defined(CONFIG_MTD_PHYSMAP_MODULE)
+        &davinci_evm_norflash_device,
+#endif
+#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
+    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
+        &ide_dev,
+#endif
 };
 
 static void __init
@@ -106,13 +405,21 @@ static __init void davinci_evm_init(void)
 {
         davinci_psc_init();
 
-#if defined(CONFIG_BLK_DEV_DAVINCI) || defined(CONFIG_BLK_DEV_DAVINCI_MODULE)
+#if defined(CONFIG_BLK_DEV_PALMCHIP_BK3710) || \
+    defined(CONFIG_BLK_DEV_PALMCHIP_BK3710_MODULE)
+#if defined(CONFIG_MTD_PHYSMAP) || \
+    defined(CONFIG_MTD_PHYSMAP_MODULE)
         printk(KERN_WARNING "WARNING: both IDE and NOR flash are enabled, "
                "but share pins.\n\t Disable IDE for NOR support.\n");
 #endif
+#endif
 
         platform_add_devices(davinci_evm_devices,
                              ARRAY_SIZE(davinci_evm_devices));
+        evm_init_i2c();
+
+        /* irlml6401 sustains over 3A, switches 5V in under 8 msec */
+        setup_usb(500, 8);
 }
 
 static __init void davinci_evm_irq_init(void)