davinci: dm365 evm cpld support: leds, card detect, other setup

Add basic support for the CPLD on the DM365 EVM board:

 - Read SW5 to set up NAND and keypad vs (someday) OneNAND
 - Export MMC/SD card detect and writeprotect signals
 - LED support (same layout as on DM355 EVM)
 - Static config for video input:
     * external HD imager precludes MMC1, Ethernet, audio
     * else either tvp5146 (SD/default) or tvp7002 (HD)

The video input could actually be switched around dynamically;
change that if/when that's needed (and after those other video
inputs have driver support).

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

1 files changed, 253 insertions, 10 deletions

diff --git a/arch/arm/mach-davinci/board-dm365-evm.c b/arch/arm/mach-davinci/board-dm365-evm.c
index 3675e844b9b1..a1d5e7dac741 100644
--- a/arch/arm/mach-davinci/board-dm365-evm.c
+++ b/arch/arm/mach-davinci/board-dm365-evm.c
@@ -20,6 +20,7 @@
 #include <linux/io.h>
 #include <linux/clk.h>
 #include <linux/i2c/at24.h>
+#include <linux/leds.h>
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/nand.h>
@@ -33,18 +34,71 @@
 #include <mach/psc.h>
 #include <mach/common.h>
 #include <mach/i2c.h>
-#include <linux/i2c.h>
 #include <mach/serial.h>
 #include <mach/common.h>
 #include <mach/mmc.h>
 #include <mach/nand.h>
 
+
+static inline int have_imager(void)
+{
+        /* REVISIT when it's supported, trigger via Kconfig */
+        return 0;
+}
+
+static inline int have_tvp7002(void)
+{
+        /* REVISIT when it's supported, trigger via Kconfig */
+        return 0;
+}
+
+
 #define DM365_ASYNC_EMIF_CONTROL_BASE   0x01d10000
 #define DM365_ASYNC_EMIF_DATA_CE0_BASE  0x02000000
+#define DM365_ASYNC_EMIF_DATA_CE1_BASE  0x04000000
 
 #define DM365_EVM_PHY_MASK              (0x2)
 #define DM365_EVM_MDIO_FREQUENCY        (2200000) /* PHY bus frequency */
 
+/*
+ * A MAX-II CPLD is used for various board control functions.
+ */
+#define CPLD_OFFSET(a13a8,a2a1)         (((a13a8) << 10) + ((a2a1) << 3))
+
+#define CPLD_VERSION    CPLD_OFFSET(0,0)        /* r/o */
+#define CPLD_TEST       CPLD_OFFSET(0,1)
+#define CPLD_LEDS       CPLD_OFFSET(0,2)
+#define CPLD_MUX        CPLD_OFFSET(0,3)
+#define CPLD_SWITCH     CPLD_OFFSET(1,0)        /* r/o */
+#define CPLD_POWER      CPLD_OFFSET(1,1)
+#define CPLD_VIDEO      CPLD_OFFSET(1,2)
+#define CPLD_CARDSTAT   CPLD_OFFSET(1,3)        /* r/o */
+
+#define CPLD_DILC_OUT   CPLD_OFFSET(2,0)
+#define CPLD_DILC_IN    CPLD_OFFSET(2,1)        /* r/o */
+
+#define CPLD_IMG_DIR0   CPLD_OFFSET(2,2)
+#define CPLD_IMG_MUX0   CPLD_OFFSET(2,3)
+#define CPLD_IMG_MUX1   CPLD_OFFSET(3,0)
+#define CPLD_IMG_DIR1   CPLD_OFFSET(3,1)
+#define CPLD_IMG_MUX2   CPLD_OFFSET(3,2)
+#define CPLD_IMG_MUX3   CPLD_OFFSET(3,3)
+#define CPLD_IMG_DIR2   CPLD_OFFSET(4,0)
+#define CPLD_IMG_MUX4   CPLD_OFFSET(4,1)
+#define CPLD_IMG_MUX5   CPLD_OFFSET(4,2)
+
+#define CPLD_RESETS     CPLD_OFFSET(4,3)
+
+#define CPLD_CCD_DIR1   CPLD_OFFSET(0x3e,0)
+#define CPLD_CCD_IO1    CPLD_OFFSET(0x3e,1)
+#define CPLD_CCD_DIR2   CPLD_OFFSET(0x3e,2)
+#define CPLD_CCD_IO2    CPLD_OFFSET(0x3e,3)
+#define CPLD_CCD_DIR3   CPLD_OFFSET(0x3f,0)
+#define CPLD_CCD_IO3    CPLD_OFFSET(0x3f,1)
+
+static void __iomem *cpld;
+
+
 /* NOTE:  this is geared for the standard config, with a socketed
  * 2 GByte Micron NAND (MT29F16G08FAA) using 128KB sectors.  If you
  * swap chips with a different block size, partitioning will
@@ -135,7 +189,27 @@ static struct davinci_i2c_platform_data i2c_pdata = {
         .bus_delay      = 0     /* usec */,
 };
 
+static int cpld_mmc_get_cd(int module)
+{
+        if (!cpld)
+                return -ENXIO;
+
+        /* low == card present */
+        return !(__raw_readb(cpld + CPLD_CARDSTAT) & BIT(module ? 4 : 0));
+}
+
+static int cpld_mmc_get_ro(int module)
+{
+        if (!cpld)
+                return -ENXIO;
+
+        /* high == card's write protect switch active */
+        return !!(__raw_readb(cpld + CPLD_CARDSTAT) & BIT(module ? 5 : 1));
+}
+
 static struct davinci_mmc_config dm365evm_mmc_config = {
+        .get_cd         = cpld_mmc_get_cd,
+        .get_ro         = cpld_mmc_get_ro,
         .wires          = 4,
         .max_freq       = 50000000,
         .caps           = MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED,
@@ -199,10 +273,185 @@ static void __init evm_init_i2c(void)
         i2c_register_board_info(1, i2c_info, ARRAY_SIZE(i2c_info));
 }
 
-static struct platform_device *dm365_evm_devices[] __initdata = {
+static struct platform_device *dm365_evm_nand_devices[] __initdata = {
         &davinci_nand_device,
 };
 
+static inline int have_leds(void)
+{
+#ifdef CONFIG_LEDS_CLASS
+        return 1;
+#else
+        return 0;
+#endif
+}
+
+struct cpld_led {
+        struct led_classdev     cdev;
+        u8                      mask;
+};
+
+static const struct {
+        const char *name;
+        const char *trigger;
+} cpld_leds[] = {
+        { "dm365evm::ds2", },
+        { "dm365evm::ds3", },
+        { "dm365evm::ds4", },
+        { "dm365evm::ds5", },
+        { "dm365evm::ds6", "nand-disk", },
+        { "dm365evm::ds7", "mmc1", },
+        { "dm365evm::ds8", "mmc0", },
+        { "dm365evm::ds9", "heartbeat", },
+};
+
+static void cpld_led_set(struct led_classdev *cdev, enum led_brightness b)
+{
+        struct cpld_led *led = container_of(cdev, struct cpld_led, cdev);
+        u8 reg = __raw_readb(cpld + CPLD_LEDS);
+
+        if (b != LED_OFF)
+                reg &= ~led->mask;
+        else
+                reg |= led->mask;
+        __raw_writeb(reg, cpld + CPLD_LEDS);
+}
+
+static enum led_brightness cpld_led_get(struct led_classdev *cdev)
+{
+        struct cpld_led *led = container_of(cdev, struct cpld_led, cdev);
+        u8 reg = __raw_readb(cpld + CPLD_LEDS);
+
+        return (reg & led->mask) ? LED_OFF : LED_FULL;
+}
+
+static int __init cpld_leds_init(void)
+{
+        int     i;
+
+        if (!have_leds() ||  !cpld)
+                return 0;
+
+        /* setup LEDs */
+        __raw_writeb(0xff, cpld + CPLD_LEDS);
+        for (i = 0; i < ARRAY_SIZE(cpld_leds); i++) {
+                struct cpld_led *led;
+
+                led = kzalloc(sizeof(*led), GFP_KERNEL);
+                if (!led)
+                        break;
+
+                led->cdev.name = cpld_leds[i].name;
+                led->cdev.brightness_set = cpld_led_set;
+                led->cdev.brightness_get = cpld_led_get;
+                led->cdev.default_trigger = cpld_leds[i].trigger;
+                led->mask = BIT(i);
+
+                if (led_classdev_register(NULL, &led->cdev) < 0) {
+                        kfree(led);
+                        break;
+                }
+        }
+
+        return 0;
+}
+/* run after subsys_initcall() for LEDs */
+fs_initcall(cpld_leds_init);
+
+
+static void __init evm_init_cpld(void)
+{
+        u8 mux, resets;
+        const char *label;
+        struct clk *aemif_clk;
+
+        /* Make sure we can configure the CPLD through CS1.  Then
+         * leave it on for later access to MMC and LED registers.
+         */
+        aemif_clk = clk_get(NULL, "aemif");
+        if (IS_ERR(aemif_clk))
+                return;
+        clk_enable(aemif_clk);
+
+        if (request_mem_region(DM365_ASYNC_EMIF_DATA_CE1_BASE, SECTION_SIZE,
+                        "cpld") == NULL)
+                goto fail;
+        cpld = ioremap(DM365_ASYNC_EMIF_DATA_CE1_BASE, SECTION_SIZE);
+        if (!cpld) {
+                release_mem_region(DM365_ASYNC_EMIF_DATA_CE1_BASE,
+                                SECTION_SIZE);
+fail:
+                pr_err("ERROR: can't map CPLD\n");
+                clk_disable(aemif_clk);
+                return;
+        }
+
+        /* External muxing for some signals */
+        mux = 0;
+
+        /* Read SW5 to set up NAND + keypad _or_ OneNAND (sync read).
+         * NOTE:  SW4 bus width setting must match!
+         */
+        if ((__raw_readb(cpld + CPLD_SWITCH) & BIT(5)) == 0) {
+                /* external keypad mux */
+                mux |= BIT(7);
+
+                platform_add_devices(dm365_evm_nand_devices,
+                                ARRAY_SIZE(dm365_evm_nand_devices));
+        } else {
+                /* no OneNAND support yet */
+        }
+
+        /* Leave external chips in reset when unused. */
+        resets = BIT(3) | BIT(2) | BIT(1) | BIT(0);
+
+        /* Static video input config with SN74CBT16214 1-of-3 mux:
+         *  - port b1 == tvp7002 (mux lowbits == 1 or 6)
+         *  - port b2 == imager (mux lowbits == 2 or 7)
+         *  - port b3 == tvp5146 (mux lowbits == 5)
+         *
+         * Runtime switching could work too, with limitations.
+         */
+        if (have_imager()) {
+                label = "HD imager";
+                mux |= 1;
+
+                /* externally mux MMC1/ENET/AIC33 to imager */
+                mux |= BIT(6) | BIT(5) | BIT(3);
+        } else {
+                struct davinci_soc_info *soc_info = &davinci_soc_info;
+
+                /* we can use MMC1 ... */
+                dm365evm_mmc_configure();
+                davinci_setup_mmc(1, &dm365evm_mmc_config);
+
+                /* ... and ENET ... */
+                dm365evm_emac_configure();
+                soc_info->emac_pdata->phy_mask = DM365_EVM_PHY_MASK;
+                soc_info->emac_pdata->mdio_max_freq = DM365_EVM_MDIO_FREQUENCY;
+                resets &= ~BIT(3);
+
+                /* ... and AIC33 */
+                resets &= ~BIT(1);
+
+                if (have_tvp7002()) {
+                        mux |= 2;
+                        resets &= ~BIT(2);
+                        label = "tvp7002 HD";
+                } else {
+                        /* default to tvp5146 */
+                        mux |= 5;
+                        resets &= ~BIT(0);
+                        label = "tvp5146 SD";
+                }
+        }
+        __raw_writeb(mux, cpld + CPLD_MUX);
+        __raw_writeb(resets, cpld + CPLD_RESETS);
+        pr_info("EVM: %s video input\n", label);
+
+        /* REVISIT export switches: NTSC/PAL (SW5.6), EXTRA1 (SW5.2), etc */
+}
+
 static struct davinci_uart_config uart_config __initdata = {
         .enabled_uarts = (1 << 0),
 };
@@ -214,11 +463,6 @@ static void __init dm365_evm_map_io(void)
 
 static __init void dm365_evm_init(void)
 {
-        struct davinci_soc_info *soc_info = &davinci_soc_info;
-
-        platform_add_devices(dm365_evm_devices,
-                                ARRAY_SIZE(dm365_evm_devices));
-
         evm_init_i2c();
         davinci_serial_init(&uart_config);
 
@@ -226,10 +470,9 @@ static __init void dm365_evm_init(void)
         dm365evm_mmc_configure();
 
         davinci_setup_mmc(0, &dm365evm_mmc_config);
-        davinci_setup_mmc(1, &dm365evm_mmc_config);
 
-        soc_info->emac_pdata->phy_mask = DM365_EVM_PHY_MASK;
-        soc_info->emac_pdata->mdio_max_freq = DM365_EVM_MDIO_FREQUENCY;
+        /* maybe setup mmc1/etc ... _after_ mmc0 */
+        evm_init_cpld();
 }
 
 static __init void dm365_evm_irq_init(void)