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davinci: dm365 evm cpld support: leds, card detect, other setup
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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>
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David Brownell authored and Kevin Hilman committed Aug 26, 2009
1 parent 37b798d commit ff255c6
Showing 1 changed file with 253 additions and 10 deletions.
263 changes: 253 additions & 10 deletions arch/arm/mach-davinci/board-dm365-evm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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>
Expand All @@ -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
Expand Down Expand Up @@ -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,
Expand Down Expand Up @@ -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),
};
Expand All @@ -214,22 +463,16 @@ 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);

dm365evm_emac_configure();
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)
Expand Down

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