diff options
| -rw-r--r-- | arch/arm/mach-omap2/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/board-h4.c | 14 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Kconfig | 5 | ||||
| -rw-r--r-- | arch/arm/plat-omap/Makefile | 2 | ||||
| -rw-r--r-- | arch/arm/plat-omap/debug-leds.c | 319 |
5 files changed, 340 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index aab97ccf1e6..2a1aca7a637 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -20,6 +20,7 @@ config MACH_OMAP_GENERIC config MACH_OMAP_H4 bool "OMAP 2420 H4 board" depends on ARCH_OMAP2 && ARCH_OMAP24XX + select OMAP_DEBUG_LEDS if LEDS || LEDS_OMAP_DEBUG config MACH_OMAP_APOLLON bool "OMAP 2420 Apollon board" diff --git a/arch/arm/mach-omap2/board-h4.c b/arch/arm/mach-omap2/board-h4.c index 1e7ed6d22ca..452193f0153 100644 --- a/arch/arm/mach-omap2/board-h4.c +++ b/arch/arm/mach-omap2/board-h4.c @@ -266,12 +266,26 @@ static struct platform_device h4_lcd_device = { .id = -1, }; +static struct resource h4_led_resources[] = { + [0] = { + .flags = IORESOURCE_MEM, + }, +}; + +static struct platform_device h4_led_device = { + .name = "omap_dbg_led", + .id = -1, + .num_resources = ARRAY_SIZE(h4_led_resources), + .resource = h4_led_resources, +}; + static struct platform_device *h4_devices[] __initdata = { &h4_smc91x_device, &h4_flash_device, &h4_irda_device, &h4_kp_device, &h4_lcd_device, + &h4_led_device, }; static inline void __init h4_init_smc91x(void) diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig index f2dc363de66..ce8bc3304e1 100644 --- a/arch/arm/plat-omap/Kconfig +++ b/arch/arm/plat-omap/Kconfig @@ -19,6 +19,11 @@ endchoice comment "OMAP Feature Selections" +config OMAP_DEBUG_LEDS + bool + help + For debug card leds on TI reference boards. + config OMAP_RESET_CLOCKS bool "Reset unused clocks during boot" depends on ARCH_OMAP diff --git a/arch/arm/plat-omap/Makefile b/arch/arm/plat-omap/Makefile index 2896b454641..4ce277d3485 100644 --- a/arch/arm/plat-omap/Makefile +++ b/arch/arm/plat-omap/Makefile @@ -16,4 +16,4 @@ obj-$(CONFIG_ARCH_OMAP16XX) += ocpi.o obj-$(CONFIG_CPU_FREQ) += cpu-omap.o obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o - +obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o diff --git a/arch/arm/plat-omap/debug-leds.c b/arch/arm/plat-omap/debug-leds.c new file mode 100644 index 00000000000..511d6a50041 --- /dev/null +++ b/arch/arm/plat-omap/debug-leds.c @@ -0,0 +1,319 @@ +/* + * linux/arch/arm/plat-omap/debug-leds.c + * + * Copyright 2003 by Texas Instruments Incorporated + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/leds.h> + +#include <asm/io.h> +#include <asm/hardware.h> +#include <asm/leds.h> +#include <asm/system.h> +#include <asm/mach-types.h> + +#include <asm/arch/fpga.h> +#include <asm/arch/gpio.h> + + +/* Many OMAP development platforms reuse the same "debug board"; these + * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the + * debug board (all green), accessed through FPGA registers. + * + * The "surfer" expansion board and H2 sample board also have two-color + * green+red LEDs (in parallel), used here for timer and idle indicators + * in preference to the ones on the debug board, for a "Disco LED" effect. + * + * This driver exports either the original ARM LED API, the new generic + * one, or both. + */ + +static spinlock_t lock; +static struct h2p2_dbg_fpga __iomem *fpga; +static u16 led_state, hw_led_state; + + +#ifdef CONFIG_LEDS +#define old_led_api() 1 +#else +#define old_led_api() 0 +#endif + +#ifdef CONFIG_LEDS_OMAP_DEBUG +#define new_led_api() 1 +#else +#define new_led_api() 0 +#endif + + +/*-------------------------------------------------------------------------*/ + +/* original ARM debug LED API: + * - timer and idle leds (some boards use non-FPGA leds here); + * - up to 4 generic leds, easily accessed in-kernel (any context) + */ + +#define GPIO_LED_RED 3 +#define GPIO_LED_GREEN OMAP_MPUIO(4) + +#define LED_STATE_ENABLED 0x01 +#define LED_STATE_CLAIMED 0x02 +#define LED_TIMER_ON 0x04 + +#define GPIO_IDLE GPIO_LED_GREEN +#define GPIO_TIMER GPIO_LED_RED + +static void h2p2_dbg_leds_event(led_event_t evt) +{ + unsigned long flags; + + spin_lock_irqsave(&lock, flags); + + if (!(led_state & LED_STATE_ENABLED) && evt != led_start) + goto done; + + switch (evt) { + case led_start: + if (fpga) + led_state |= LED_STATE_ENABLED; + break; + + case led_stop: + case led_halted: + /* all leds off during suspend or shutdown */ + + if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) { + omap_set_gpio_dataout(GPIO_TIMER, 0); + omap_set_gpio_dataout(GPIO_IDLE, 0); + } + + __raw_writew(~0, &fpga->leds); + led_state &= ~LED_STATE_ENABLED; + goto done; + + case led_claim: + led_state |= LED_STATE_CLAIMED; + hw_led_state = 0; + break; + + case led_release: + led_state &= ~LED_STATE_CLAIMED; + break; + +#ifdef CONFIG_LEDS_TIMER + case led_timer: + led_state ^= LED_TIMER_ON; + + if (machine_is_omap_perseus2() || machine_is_omap_h4()) + hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER; + else { + omap_set_gpio_dataout(GPIO_TIMER, + led_state & LED_TIMER_ON); + goto done; + } + + break; +#endif + +#ifdef CONFIG_LEDS_CPU + /* LED lit iff busy */ + case led_idle_start: + if (machine_is_omap_perseus2() || machine_is_omap_h4()) + hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE; + else { + omap_set_gpio_dataout(GPIO_IDLE, 1); + goto done; + } + + break; + + case led_idle_end: + if (machine_is_omap_perseus2() || machine_is_omap_h4()) + hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE; + else { + omap_set_gpio_dataout(GPIO_IDLE, 0); + goto done; + } + + break; +#endif + + case led_green_on: + hw_led_state |= H2P2_DBG_FPGA_LED_GREEN; + break; + case led_green_off: + hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN; + break; + + case led_amber_on: + hw_led_state |= H2P2_DBG_FPGA_LED_AMBER; + break; + case led_amber_off: + hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER; + break; + + case led_red_on: + hw_led_state |= H2P2_DBG_FPGA_LED_RED; + break; + case led_red_off: + hw_led_state &= ~H2P2_DBG_FPGA_LED_RED; + break; + + case led_blue_on: + hw_led_state |= H2P2_DBG_FPGA_LED_BLUE; + break; + case led_blue_off: + hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE; + break; + + default: + break; + } + + + /* + * Actually burn the LEDs + */ + if (led_state & LED_STATE_ENABLED) + __raw_writew(~hw_led_state, &fpga->leds); + +done: + spin_unlock_irqrestore(&lock, flags); +} + +/*-------------------------------------------------------------------------*/ + +/* "new" LED API + * - with syfs access and generic triggering + * - not readily accessible to in-kernel drivers + */ + +struct dbg_led { + struct led_classdev cdev; + u16 mask; +}; + +static struct dbg_led dbg_leds[] = { + /* REVISIT at least H2 uses different timer & cpu leds... */ +#ifndef CONFIG_LEDS_TIMER + { .mask = 1 << 0, .cdev.name = "d4:green", }, /* timer */ +#endif +#ifndef CONFIG_LEDS_CPU + { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */ +#endif + { .mask = 1 << 2, .cdev.name = "d6:green", }, + { .mask = 1 << 3, .cdev.name = "d7:green", }, + + { .mask = 1 << 4, .cdev.name = "d8:green", }, + { .mask = 1 << 5, .cdev.name = "d9:green", }, + { .mask = 1 << 6, .cdev.name = "d10:green", }, + { .mask = 1 << 7, .cdev.name = "d11:green", }, + + { .mask = 1 << 8, .cdev.name = "d12:green", }, + { .mask = 1 << 9, .cdev.name = "d13:green", }, + { .mask = 1 << 10, .cdev.name = "d14:green", }, + { .mask = 1 << 11, .cdev.name = "d15:green", }, + +#ifndef CONFIG_LEDS + { .mask = 1 << 12, .cdev.name = "d16:green", }, + { .mask = 1 << 13, .cdev.name = "d17:green", }, + { .mask = 1 << 14, .cdev.name = "d18:green", }, + { .mask = 1 << 15, .cdev.name = "d19:green", }, +#endif +}; + +static void +fpga_led_set(struct led_classdev *cdev, enum led_brightness value) +{ + struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); + unsigned long flags; + + spin_lock_irqsave(&lock, flags); + if (value == LED_OFF) + hw_led_state &= ~led->mask; + else + hw_led_state |= led->mask; + __raw_writew(~hw_led_state, &fpga->leds); + spin_unlock_irqrestore(&lock, flags); +} + +static void __init newled_init(struct device *dev) +{ + unsigned i; + struct dbg_led *led; + int status; + + for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) { + led->cdev.brightness_set = fpga_led_set; + status = led_classdev_register(dev, &led->cdev); + if (status < 0) + break; + } + return; +} + + +/*-------------------------------------------------------------------------*/ + +static int /* __init */ fpga_probe(struct platform_device *pdev) +{ + struct resource *iomem; + + spin_lock_init(&lock); + + iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!iomem) + return -ENODEV; + + fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE); + __raw_writew(~0, &fpga->leds); + + if (old_led_api()) { + leds_event = h2p2_dbg_leds_event; + leds_event(led_start); + } + + if (new_led_api()) { + newled_init(&pdev->dev); + } + + return 0; +} + +static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg) +{ + __raw_writew(~0, &fpga->leds); + return 0; +} + +static int fpga_resume_early(struct platform_device *pdev) +{ + __raw_writew(~hw_led_state, &fpga->leds); + return 0; +} + + +static struct platform_driver led_driver = { + .driver.name = "omap_dbg_led", + .probe = fpga_probe, + .suspend_late = fpga_suspend_late, + .resume_early = fpga_resume_early, +}; + +static int __init fpga_init(void) +{ + if (machine_is_omap_h4() + || machine_is_omap_h3() + || machine_is_omap_h2() + || machine_is_omap_perseus2() + ) + return platform_driver_register(&led_driver); + return 0; +} +fs_initcall(fpga_init); |