David Brownell | 994c84e | 2006-12-06 17:14:03 -0800 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/plat-omap/debug-leds.c |
| 3 | * |
| 4 | * Copyright 2003 by Texas Instruments Incorporated |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/leds.h> |
| 14 | |
| 15 | #include <asm/io.h> |
Russell King | be50972 | 2008-08-04 10:41:28 +0100 | [diff] [blame] | 16 | #include <asm/arch/hardware.h> |
David Brownell | 994c84e | 2006-12-06 17:14:03 -0800 | [diff] [blame] | 17 | #include <asm/leds.h> |
| 18 | #include <asm/system.h> |
| 19 | #include <asm/mach-types.h> |
| 20 | |
| 21 | #include <asm/arch/fpga.h> |
| 22 | #include <asm/arch/gpio.h> |
| 23 | |
| 24 | |
| 25 | /* Many OMAP development platforms reuse the same "debug board"; these |
| 26 | * platforms include H2, H3, H4, and Perseus2. There are 16 LEDs on the |
| 27 | * debug board (all green), accessed through FPGA registers. |
| 28 | * |
| 29 | * The "surfer" expansion board and H2 sample board also have two-color |
| 30 | * green+red LEDs (in parallel), used here for timer and idle indicators |
| 31 | * in preference to the ones on the debug board, for a "Disco LED" effect. |
| 32 | * |
| 33 | * This driver exports either the original ARM LED API, the new generic |
| 34 | * one, or both. |
| 35 | */ |
| 36 | |
| 37 | static spinlock_t lock; |
| 38 | static struct h2p2_dbg_fpga __iomem *fpga; |
| 39 | static u16 led_state, hw_led_state; |
| 40 | |
| 41 | |
David Brownell | 994c84e | 2006-12-06 17:14:03 -0800 | [diff] [blame] | 42 | #ifdef CONFIG_LEDS_OMAP_DEBUG |
| 43 | #define new_led_api() 1 |
| 44 | #else |
| 45 | #define new_led_api() 0 |
| 46 | #endif |
| 47 | |
| 48 | |
| 49 | /*-------------------------------------------------------------------------*/ |
| 50 | |
| 51 | /* original ARM debug LED API: |
| 52 | * - timer and idle leds (some boards use non-FPGA leds here); |
| 53 | * - up to 4 generic leds, easily accessed in-kernel (any context) |
| 54 | */ |
| 55 | |
| 56 | #define GPIO_LED_RED 3 |
| 57 | #define GPIO_LED_GREEN OMAP_MPUIO(4) |
| 58 | |
| 59 | #define LED_STATE_ENABLED 0x01 |
| 60 | #define LED_STATE_CLAIMED 0x02 |
| 61 | #define LED_TIMER_ON 0x04 |
| 62 | |
| 63 | #define GPIO_IDLE GPIO_LED_GREEN |
| 64 | #define GPIO_TIMER GPIO_LED_RED |
| 65 | |
| 66 | static void h2p2_dbg_leds_event(led_event_t evt) |
| 67 | { |
| 68 | unsigned long flags; |
| 69 | |
| 70 | spin_lock_irqsave(&lock, flags); |
| 71 | |
| 72 | if (!(led_state & LED_STATE_ENABLED) && evt != led_start) |
| 73 | goto done; |
| 74 | |
| 75 | switch (evt) { |
| 76 | case led_start: |
| 77 | if (fpga) |
| 78 | led_state |= LED_STATE_ENABLED; |
| 79 | break; |
| 80 | |
| 81 | case led_stop: |
| 82 | case led_halted: |
| 83 | /* all leds off during suspend or shutdown */ |
| 84 | |
| 85 | if (!(machine_is_omap_perseus2() || machine_is_omap_h4())) { |
| 86 | omap_set_gpio_dataout(GPIO_TIMER, 0); |
| 87 | omap_set_gpio_dataout(GPIO_IDLE, 0); |
| 88 | } |
| 89 | |
| 90 | __raw_writew(~0, &fpga->leds); |
| 91 | led_state &= ~LED_STATE_ENABLED; |
| 92 | goto done; |
| 93 | |
| 94 | case led_claim: |
| 95 | led_state |= LED_STATE_CLAIMED; |
| 96 | hw_led_state = 0; |
| 97 | break; |
| 98 | |
| 99 | case led_release: |
| 100 | led_state &= ~LED_STATE_CLAIMED; |
| 101 | break; |
| 102 | |
| 103 | #ifdef CONFIG_LEDS_TIMER |
| 104 | case led_timer: |
| 105 | led_state ^= LED_TIMER_ON; |
| 106 | |
| 107 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
| 108 | hw_led_state ^= H2P2_DBG_FPGA_P2_LED_TIMER; |
| 109 | else { |
| 110 | omap_set_gpio_dataout(GPIO_TIMER, |
| 111 | led_state & LED_TIMER_ON); |
| 112 | goto done; |
| 113 | } |
| 114 | |
| 115 | break; |
| 116 | #endif |
| 117 | |
| 118 | #ifdef CONFIG_LEDS_CPU |
| 119 | /* LED lit iff busy */ |
| 120 | case led_idle_start: |
| 121 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
| 122 | hw_led_state &= ~H2P2_DBG_FPGA_P2_LED_IDLE; |
| 123 | else { |
| 124 | omap_set_gpio_dataout(GPIO_IDLE, 1); |
| 125 | goto done; |
| 126 | } |
| 127 | |
| 128 | break; |
| 129 | |
| 130 | case led_idle_end: |
| 131 | if (machine_is_omap_perseus2() || machine_is_omap_h4()) |
| 132 | hw_led_state |= H2P2_DBG_FPGA_P2_LED_IDLE; |
| 133 | else { |
| 134 | omap_set_gpio_dataout(GPIO_IDLE, 0); |
| 135 | goto done; |
| 136 | } |
| 137 | |
| 138 | break; |
| 139 | #endif |
| 140 | |
| 141 | case led_green_on: |
| 142 | hw_led_state |= H2P2_DBG_FPGA_LED_GREEN; |
| 143 | break; |
| 144 | case led_green_off: |
| 145 | hw_led_state &= ~H2P2_DBG_FPGA_LED_GREEN; |
| 146 | break; |
| 147 | |
| 148 | case led_amber_on: |
| 149 | hw_led_state |= H2P2_DBG_FPGA_LED_AMBER; |
| 150 | break; |
| 151 | case led_amber_off: |
| 152 | hw_led_state &= ~H2P2_DBG_FPGA_LED_AMBER; |
| 153 | break; |
| 154 | |
| 155 | case led_red_on: |
| 156 | hw_led_state |= H2P2_DBG_FPGA_LED_RED; |
| 157 | break; |
| 158 | case led_red_off: |
| 159 | hw_led_state &= ~H2P2_DBG_FPGA_LED_RED; |
| 160 | break; |
| 161 | |
| 162 | case led_blue_on: |
| 163 | hw_led_state |= H2P2_DBG_FPGA_LED_BLUE; |
| 164 | break; |
| 165 | case led_blue_off: |
| 166 | hw_led_state &= ~H2P2_DBG_FPGA_LED_BLUE; |
| 167 | break; |
| 168 | |
| 169 | default: |
| 170 | break; |
| 171 | } |
| 172 | |
| 173 | |
| 174 | /* |
| 175 | * Actually burn the LEDs |
| 176 | */ |
| 177 | if (led_state & LED_STATE_ENABLED) |
| 178 | __raw_writew(~hw_led_state, &fpga->leds); |
| 179 | |
| 180 | done: |
| 181 | spin_unlock_irqrestore(&lock, flags); |
| 182 | } |
| 183 | |
| 184 | /*-------------------------------------------------------------------------*/ |
| 185 | |
| 186 | /* "new" LED API |
| 187 | * - with syfs access and generic triggering |
| 188 | * - not readily accessible to in-kernel drivers |
| 189 | */ |
| 190 | |
| 191 | struct dbg_led { |
| 192 | struct led_classdev cdev; |
| 193 | u16 mask; |
| 194 | }; |
| 195 | |
| 196 | static struct dbg_led dbg_leds[] = { |
| 197 | /* REVISIT at least H2 uses different timer & cpu leds... */ |
| 198 | #ifndef CONFIG_LEDS_TIMER |
David Brownell | e0b50d3 | 2007-03-28 13:09:36 -0700 | [diff] [blame] | 199 | { .mask = 1 << 0, .cdev.name = "d4:green", |
| 200 | .cdev.default_trigger = "heartbeat", }, |
David Brownell | 994c84e | 2006-12-06 17:14:03 -0800 | [diff] [blame] | 201 | #endif |
| 202 | #ifndef CONFIG_LEDS_CPU |
| 203 | { .mask = 1 << 1, .cdev.name = "d5:green", }, /* !idle */ |
| 204 | #endif |
| 205 | { .mask = 1 << 2, .cdev.name = "d6:green", }, |
| 206 | { .mask = 1 << 3, .cdev.name = "d7:green", }, |
| 207 | |
| 208 | { .mask = 1 << 4, .cdev.name = "d8:green", }, |
| 209 | { .mask = 1 << 5, .cdev.name = "d9:green", }, |
| 210 | { .mask = 1 << 6, .cdev.name = "d10:green", }, |
| 211 | { .mask = 1 << 7, .cdev.name = "d11:green", }, |
| 212 | |
| 213 | { .mask = 1 << 8, .cdev.name = "d12:green", }, |
| 214 | { .mask = 1 << 9, .cdev.name = "d13:green", }, |
| 215 | { .mask = 1 << 10, .cdev.name = "d14:green", }, |
| 216 | { .mask = 1 << 11, .cdev.name = "d15:green", }, |
| 217 | |
| 218 | #ifndef CONFIG_LEDS |
| 219 | { .mask = 1 << 12, .cdev.name = "d16:green", }, |
| 220 | { .mask = 1 << 13, .cdev.name = "d17:green", }, |
| 221 | { .mask = 1 << 14, .cdev.name = "d18:green", }, |
| 222 | { .mask = 1 << 15, .cdev.name = "d19:green", }, |
| 223 | #endif |
| 224 | }; |
| 225 | |
| 226 | static void |
| 227 | fpga_led_set(struct led_classdev *cdev, enum led_brightness value) |
| 228 | { |
| 229 | struct dbg_led *led = container_of(cdev, struct dbg_led, cdev); |
| 230 | unsigned long flags; |
| 231 | |
| 232 | spin_lock_irqsave(&lock, flags); |
| 233 | if (value == LED_OFF) |
| 234 | hw_led_state &= ~led->mask; |
| 235 | else |
| 236 | hw_led_state |= led->mask; |
| 237 | __raw_writew(~hw_led_state, &fpga->leds); |
| 238 | spin_unlock_irqrestore(&lock, flags); |
| 239 | } |
| 240 | |
| 241 | static void __init newled_init(struct device *dev) |
| 242 | { |
| 243 | unsigned i; |
| 244 | struct dbg_led *led; |
| 245 | int status; |
| 246 | |
| 247 | for (i = 0, led = dbg_leds; i < ARRAY_SIZE(dbg_leds); i++, led++) { |
| 248 | led->cdev.brightness_set = fpga_led_set; |
| 249 | status = led_classdev_register(dev, &led->cdev); |
| 250 | if (status < 0) |
| 251 | break; |
| 252 | } |
| 253 | return; |
| 254 | } |
| 255 | |
| 256 | |
| 257 | /*-------------------------------------------------------------------------*/ |
| 258 | |
| 259 | static int /* __init */ fpga_probe(struct platform_device *pdev) |
| 260 | { |
| 261 | struct resource *iomem; |
| 262 | |
| 263 | spin_lock_init(&lock); |
| 264 | |
| 265 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 266 | if (!iomem) |
| 267 | return -ENODEV; |
| 268 | |
| 269 | fpga = ioremap(iomem->start, H2P2_DBG_FPGA_SIZE); |
| 270 | __raw_writew(~0, &fpga->leds); |
| 271 | |
David Brownell | e0b50d3 | 2007-03-28 13:09:36 -0700 | [diff] [blame] | 272 | #ifdef CONFIG_LEDS |
| 273 | leds_event = h2p2_dbg_leds_event; |
| 274 | leds_event(led_start); |
| 275 | #endif |
David Brownell | 994c84e | 2006-12-06 17:14:03 -0800 | [diff] [blame] | 276 | |
| 277 | if (new_led_api()) { |
| 278 | newled_init(&pdev->dev); |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int fpga_suspend_late(struct platform_device *pdev, pm_message_t mesg) |
| 285 | { |
| 286 | __raw_writew(~0, &fpga->leds); |
| 287 | return 0; |
| 288 | } |
| 289 | |
| 290 | static int fpga_resume_early(struct platform_device *pdev) |
| 291 | { |
| 292 | __raw_writew(~hw_led_state, &fpga->leds); |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | |
| 297 | static struct platform_driver led_driver = { |
| 298 | .driver.name = "omap_dbg_led", |
| 299 | .probe = fpga_probe, |
| 300 | .suspend_late = fpga_suspend_late, |
| 301 | .resume_early = fpga_resume_early, |
| 302 | }; |
| 303 | |
| 304 | static int __init fpga_init(void) |
| 305 | { |
| 306 | if (machine_is_omap_h4() |
| 307 | || machine_is_omap_h3() |
| 308 | || machine_is_omap_h2() |
| 309 | || machine_is_omap_perseus2() |
| 310 | ) |
| 311 | return platform_driver_register(&led_driver); |
| 312 | return 0; |
| 313 | } |
| 314 | fs_initcall(fpga_init); |