diff options
Diffstat (limited to 'arch/arm/mach-omap1/board-ams-delta.c')
| -rw-r--r-- | arch/arm/mach-omap1/board-ams-delta.c | 173 |
1 files changed, 99 insertions, 74 deletions
diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c index dd28d2614d7f..af318d958fd2 100644 --- a/arch/arm/mach-omap1/board-ams-delta.c +++ b/arch/arm/mach-omap1/board-ams-delta.c @@ -250,39 +250,6 @@ static struct platform_device latch2_gpio_device = { #define LATCH2_PIN_HOOKFLASH1 14 #define LATCH2_PIN_HOOKFLASH2 15 -static const struct gpio latch_gpios[] __initconst = { - { - .gpio = LATCH1_GPIO_BASE + 6, - .flags = GPIOF_OUT_INIT_LOW, - .label = "dockit1", - }, - { - .gpio = LATCH1_GPIO_BASE + 7, - .flags = GPIOF_OUT_INIT_LOW, - .label = "dockit2", - }, - { - .gpio = AMS_DELTA_GPIO_PIN_SCARD_RSTIN, - .flags = GPIOF_OUT_INIT_LOW, - .label = "scard_rstin", - }, - { - .gpio = AMS_DELTA_GPIO_PIN_SCARD_CMDVCC, - .flags = GPIOF_OUT_INIT_LOW, - .label = "scard_cmdvcc", - }, - { - .gpio = AMS_DELTA_LATCH2_GPIO_BASE + 14, - .flags = GPIOF_OUT_INIT_LOW, - .label = "hookflash1", - }, - { - .gpio = AMS_DELTA_LATCH2_GPIO_BASE + 15, - .flags = GPIOF_OUT_INIT_LOW, - .label = "hookflash2", - }, -}; - static struct regulator_consumer_supply modem_nreset_consumers[] = { REGULATOR_SUPPLY("RESET#", "serial8250.1"), REGULATOR_SUPPLY("POR", "cx20442-codec"), @@ -300,7 +267,6 @@ static struct regulator_init_data modem_nreset_data = { static struct fixed_voltage_config modem_nreset_config = { .supply_name = "modem_nreset", .microvolts = 3300000, - .gpio = AMS_DELTA_GPIO_PIN_MODEM_NRESET, .startup_delay = 25000, .enable_high = 1, .enabled_at_boot = 1, @@ -315,26 +281,21 @@ static struct platform_device modem_nreset_device = { }, }; +static struct gpiod_lookup_table ams_delta_nreset_gpiod_table = { + .dev_id = "reg-fixed-voltage", + .table = { + GPIO_LOOKUP(LATCH2_LABEL, LATCH2_PIN_MODEM_NRESET, + NULL, GPIO_ACTIVE_HIGH), + { }, + }, +}; + struct modem_private_data { struct regulator *regulator; }; static struct modem_private_data modem_priv; -void ams_delta_latch_write(int base, int ngpio, u16 mask, u16 value) -{ - int bit = 0; - u16 bitpos = 1 << bit; - - for (; bit < ngpio; bit++, bitpos = bitpos << 1) { - if (!(mask & bitpos)) - continue; - else - gpio_set_value(base + bit, (value & bitpos) != 0); - } -} -EXPORT_SYMBOL(ams_delta_latch_write); - static struct resource ams_delta_nand_resources[] = { [0] = { .start = OMAP1_MPUIO_BASE, @@ -568,7 +529,6 @@ static struct regulator_init_data keybrd_pwr_initdata = { static struct fixed_voltage_config keybrd_pwr_config = { .supply_name = "keybrd_pwr", .microvolts = 5000000, - .gpio = AMS_DELTA_GPIO_PIN_KEYBRD_PWR, .enable_high = 1, .init_data = &keybrd_pwr_initdata, }; @@ -602,6 +562,7 @@ static struct platform_device *ams_delta_devices[] __initdata = { }; static struct gpiod_lookup_table *ams_delta_gpio_tables[] __initdata = { + &ams_delta_nreset_gpiod_table, &ams_delta_audio_gpio_table, &keybrd_pwr_gpio_table, &ams_delta_lcd_gpio_table, @@ -630,6 +591,28 @@ static struct gpiod_hog ams_delta_gpio_hogs[] = { {}, }; +static struct plat_serial8250_port ams_delta_modem_ports[]; + +/* + * Obtain MODEM IRQ GPIO descriptor using its hardware pin + * number and assign related IRQ number to the MODEM port. + * Keep the GPIO descriptor open so nobody steps in. + */ +static void __init modem_assign_irq(struct gpio_chip *chip) +{ + struct gpio_desc *gpiod; + + gpiod = gpiochip_request_own_desc(chip, AMS_DELTA_GPIO_PIN_MODEM_IRQ, + "modem_irq"); + if (IS_ERR(gpiod)) { + pr_err("%s: modem IRQ GPIO request failed (%ld)\n", __func__, + PTR_ERR(gpiod)); + } else { + gpiod_direction_input(gpiod); + ams_delta_modem_ports[0].irq = gpiod_to_irq(gpiod); + } +} + /* * The purpose of this function is to take care of proper initialization of * devices and data structures which depend on GPIO lines provided by OMAP GPIO @@ -649,7 +632,47 @@ static void __init omap_gpio_deps_init(void) return; } + /* + * Start with FIQ initialization as it may have to request + * and release successfully each OMAP GPIO pin in turn. + */ ams_delta_init_fiq(chip, &ams_delta_serio_device); + + modem_assign_irq(chip); +} + +/* + * Initialize latch2 pins with values which are safe for dependent on-board + * devices or useful for their successull initialization even before GPIO + * driver takes control over the latch pins: + * - LATCH2_PIN_LCD_VBLEN = 0 + * - LATCH2_PIN_LCD_NDISP = 0 Keep LCD device powered off before its + * driver takes control over it. + * - LATCH2_PIN_NAND_NCE = 0 + * - LATCH2_PIN_NAND_NWP = 0 Keep NAND device down and write- + * protected before its driver takes + * control over it. + * - LATCH2_PIN_KEYBRD_PWR = 0 Keep keyboard powered off before serio + * driver takes control over it. + * - LATCH2_PIN_KEYBRD_DATAOUT = 0 Keep low to avoid corruption of first + * byte of data received from attached + * keyboard when serio device is probed; + * the pin is also hogged low by the latch2 + * GPIO driver as soon as it is ready. + * - LATCH2_PIN_MODEM_NRESET = 1 Enable voice MODEM device, allowing for + * its successful probe even before a + * regulator it depends on, which in turn + * takes control over the pin, is set up. + * - LATCH2_PIN_MODEM_CODEC = 1 Attach voice MODEM CODEC data port + * to the MODEM so the CODEC is under + * control even if audio driver doesn't + * take it over. + */ +static void __init ams_delta_latch2_init(void) +{ + u16 latch2 = 1 << LATCH2_PIN_MODEM_NRESET | 1 << LATCH2_PIN_MODEM_CODEC; + + __raw_writew(latch2, LATCH2_VIRT); } static void __init ams_delta_init(void) @@ -673,6 +696,7 @@ static void __init ams_delta_init(void) omap_cfg_reg(J18_1610_CAM_D7); omap_gpio_deps_init(); + ams_delta_latch2_init(); gpiod_add_hogs(ams_delta_gpio_hogs); omap_serial_init(); @@ -813,7 +837,6 @@ static void __init ams_delta_led_init(struct gpio_chip *chip) static int __init ams_delta_gpio_init(void) { struct gpio_chip *chip; - int err; if (!machine_is_ams_delta()) return -ENODEV; @@ -824,11 +847,7 @@ static int __init ams_delta_gpio_init(void) else ams_delta_led_init(chip); - err = gpio_request_array(latch_gpios, ARRAY_SIZE(latch_gpios)); - if (err) - pr_err("Couldn't take over latch1/latch2 GPIO pins\n"); - - return err; + return 0; } device_initcall_sync(ams_delta_gpio_init); @@ -844,33 +863,44 @@ static int __init modem_nreset_init(void) } +/* + * This function expects MODEM IRQ number already assigned to the port + * and fails if it's not. + * The MODEM device requires its RESET# pin kept high during probe. + * That requirement can be fulfilled in several ways: + * - with a descriptor of already functional modem_nreset regulator + * assigned to the MODEM private data, + * - with the regulator not yet controlled by modem_pm function but + * already enabled by default on probe, + * - before the modem_nreset regulator is probed, with the pin already + * set high explicitly. + * The last one is already guaranteed by ams_delta_latch2_init() called + * from machine_init. + * In order to avoid taking over ttyS0 device slot, the MODEM device + * should be registered after OMAP serial ports. Since those ports + * are registered at arch_initcall, this function can be called safely + * at arch_initcall_sync earliest. + */ static int __init ams_delta_modem_init(void) { int err; - omap_cfg_reg(M14_1510_GPIO2); - ams_delta_modem_ports[0].irq = - gpio_to_irq(AMS_DELTA_GPIO_PIN_MODEM_IRQ); + if (!machine_is_ams_delta()) + return -ENODEV; - err = gpio_request(AMS_DELTA_GPIO_PIN_MODEM_IRQ, "modem"); - if (err) { - pr_err("Couldn't request gpio pin for modem\n"); - return err; - } - gpio_direction_input(AMS_DELTA_GPIO_PIN_MODEM_IRQ); + if (ams_delta_modem_ports[0].irq < 0) + return ams_delta_modem_ports[0].irq; + + omap_cfg_reg(M14_1510_GPIO2); /* Initialize the modem_nreset regulator consumer before use */ modem_priv.regulator = ERR_PTR(-ENODEV); - ams_delta_latch2_write(AMS_DELTA_LATCH2_MODEM_CODEC, - AMS_DELTA_LATCH2_MODEM_CODEC); - err = platform_device_register(&ams_delta_modem_device); - if (err) - gpio_free(AMS_DELTA_GPIO_PIN_MODEM_IRQ); return err; } +arch_initcall_sync(ams_delta_modem_init); static int __init late_init(void) { @@ -880,10 +910,6 @@ static int __init late_init(void) if (err) return err; - err = ams_delta_modem_init(); - if (err) - return err; - /* * Once the modem device is registered, the modem_nreset * regulator can be requested on behalf of that device. @@ -898,7 +924,6 @@ static int __init late_init(void) unregister: platform_device_unregister(&ams_delta_modem_device); - gpio_free(AMS_DELTA_GPIO_PIN_MODEM_IRQ); return err; } |