Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Generic GPIO driver for logic cells found in the Nomadik SoC |
| 3 | * |
| 4 | * Copyright (C) 2008,2009 STMicroelectronics |
| 5 | * Copyright (C) 2009 Alessandro Rubini <rubini@unipv.it> |
| 6 | * Rewritten based on work by Prafulla WADASKAR <prafulla.wadaskar@st.com> |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 7 | * Copyright (C) 2011 Linus Walleij <linus.walleij@linaro.org> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/device.h> |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 17 | #include <linux/platform_device.h> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 18 | #include <linux/io.h> |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 19 | #include <linux/clk.h> |
| 20 | #include <linux/err.h> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 21 | #include <linux/gpio.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/irq.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 25 | #include <linux/slab.h> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 26 | |
Will Deacon | adfed15 | 2011-02-28 10:12:29 +0000 | [diff] [blame] | 27 | #include <asm/mach/irq.h> |
| 28 | |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 29 | #include <plat/pincfg.h> |
Linus Walleij | 0f33286 | 2011-08-22 08:33:30 +0100 | [diff] [blame] | 30 | #include <plat/gpio-nomadik.h> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 31 | #include <mach/hardware.h> |
Russell King | 75482dc | 2011-07-26 10:57:37 +0100 | [diff] [blame] | 32 | #include <asm/gpio.h> |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 33 | |
| 34 | /* |
| 35 | * The GPIO module in the Nomadik family of Systems-on-Chip is an |
| 36 | * AMBA device, managing 32 pins and alternate functions. The logic block |
Jonas Aaberg | 9c66ee6 | 2010-10-13 13:14:17 +0200 | [diff] [blame] | 37 | * is currently used in the Nomadik and ux500. |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 38 | * |
| 39 | * Symbols in this file are called "nmk_gpio" for "nomadik gpio" |
| 40 | */ |
| 41 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 42 | #define NMK_GPIO_PER_CHIP 32 |
| 43 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 44 | struct nmk_gpio_chip { |
| 45 | struct gpio_chip chip; |
| 46 | void __iomem *addr; |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 47 | struct clk *clk; |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 48 | unsigned int bank; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 49 | unsigned int parent_irq; |
Virupax Sadashivpetimath | 2c8bb0e | 2010-11-11 14:10:38 +0530 | [diff] [blame] | 50 | int secondary_parent_irq; |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 51 | u32 (*get_secondary_status)(unsigned int bank); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 52 | void (*set_ioforce)(bool enable); |
Rabin Vincent | c0fcb8d | 2010-03-03 04:48:54 +0100 | [diff] [blame] | 53 | spinlock_t lock; |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 54 | bool sleepmode; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 55 | /* Keep track of configured edges */ |
| 56 | u32 edge_rising; |
| 57 | u32 edge_falling; |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 58 | u32 real_wake; |
| 59 | u32 rwimsc; |
| 60 | u32 fwimsc; |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 61 | u32 rimsc; |
| 62 | u32 fimsc; |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 63 | u32 pull_up; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 64 | }; |
| 65 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 66 | static struct nmk_gpio_chip * |
| 67 | nmk_gpio_chips[DIV_ROUND_UP(ARCH_NR_GPIOS, NMK_GPIO_PER_CHIP)]; |
| 68 | |
| 69 | static DEFINE_SPINLOCK(nmk_gpio_slpm_lock); |
| 70 | |
| 71 | #define NUM_BANKS ARRAY_SIZE(nmk_gpio_chips) |
| 72 | |
Rabin Vincent | 6f9a974 | 2010-06-02 05:50:28 +0100 | [diff] [blame] | 73 | static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, |
| 74 | unsigned offset, int gpio_mode) |
| 75 | { |
| 76 | u32 bit = 1 << offset; |
| 77 | u32 afunc, bfunc; |
| 78 | |
| 79 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; |
| 80 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; |
| 81 | if (gpio_mode & NMK_GPIO_ALT_A) |
| 82 | afunc |= bit; |
| 83 | if (gpio_mode & NMK_GPIO_ALT_B) |
| 84 | bfunc |= bit; |
| 85 | writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); |
| 86 | writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); |
| 87 | } |
| 88 | |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 89 | static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip, |
| 90 | unsigned offset, enum nmk_gpio_slpm mode) |
| 91 | { |
| 92 | u32 bit = 1 << offset; |
| 93 | u32 slpm; |
| 94 | |
| 95 | slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC); |
| 96 | if (mode == NMK_GPIO_SLPM_NOCHANGE) |
| 97 | slpm |= bit; |
| 98 | else |
| 99 | slpm &= ~bit; |
| 100 | writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC); |
| 101 | } |
| 102 | |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 103 | static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, |
| 104 | unsigned offset, enum nmk_gpio_pull pull) |
| 105 | { |
| 106 | u32 bit = 1 << offset; |
| 107 | u32 pdis; |
| 108 | |
| 109 | pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 110 | if (pull == NMK_GPIO_PULL_NONE) { |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 111 | pdis |= bit; |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 112 | nmk_chip->pull_up &= ~bit; |
| 113 | } else { |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 114 | pdis &= ~bit; |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 115 | } |
| 116 | |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 117 | writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); |
| 118 | |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 119 | if (pull == NMK_GPIO_PULL_UP) { |
| 120 | nmk_chip->pull_up |= bit; |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 121 | writel(bit, nmk_chip->addr + NMK_GPIO_DATS); |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 122 | } else if (pull == NMK_GPIO_PULL_DOWN) { |
| 123 | nmk_chip->pull_up &= ~bit; |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 124 | writel(bit, nmk_chip->addr + NMK_GPIO_DATC); |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 125 | } |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 126 | } |
| 127 | |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 128 | static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip, |
| 129 | unsigned offset) |
| 130 | { |
| 131 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); |
| 132 | } |
| 133 | |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 134 | static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip, |
| 135 | unsigned offset, int val) |
| 136 | { |
| 137 | if (val) |
| 138 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS); |
| 139 | else |
| 140 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC); |
| 141 | } |
| 142 | |
| 143 | static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip, |
| 144 | unsigned offset, int val) |
| 145 | { |
| 146 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); |
| 147 | __nmk_gpio_set_output(nmk_chip, offset, val); |
| 148 | } |
| 149 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 150 | static void __nmk_gpio_set_mode_safe(struct nmk_gpio_chip *nmk_chip, |
| 151 | unsigned offset, int gpio_mode, |
| 152 | bool glitch) |
| 153 | { |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 154 | u32 rwimsc = nmk_chip->rwimsc; |
| 155 | u32 fwimsc = nmk_chip->fwimsc; |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 156 | |
| 157 | if (glitch && nmk_chip->set_ioforce) { |
| 158 | u32 bit = BIT(offset); |
| 159 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 160 | /* Prevent spurious wakeups */ |
| 161 | writel(rwimsc & ~bit, nmk_chip->addr + NMK_GPIO_RWIMSC); |
| 162 | writel(fwimsc & ~bit, nmk_chip->addr + NMK_GPIO_FWIMSC); |
| 163 | |
| 164 | nmk_chip->set_ioforce(true); |
| 165 | } |
| 166 | |
| 167 | __nmk_gpio_set_mode(nmk_chip, offset, gpio_mode); |
| 168 | |
| 169 | if (glitch && nmk_chip->set_ioforce) { |
| 170 | nmk_chip->set_ioforce(false); |
| 171 | |
| 172 | writel(rwimsc, nmk_chip->addr + NMK_GPIO_RWIMSC); |
| 173 | writel(fwimsc, nmk_chip->addr + NMK_GPIO_FWIMSC); |
| 174 | } |
| 175 | } |
| 176 | |
Rabin Vincent | 6c42ad1 | 2011-05-23 12:22:18 +0530 | [diff] [blame^] | 177 | static void |
| 178 | nmk_gpio_disable_lazy_irq(struct nmk_gpio_chip *nmk_chip, unsigned offset) |
| 179 | { |
| 180 | u32 falling = nmk_chip->fimsc & BIT(offset); |
| 181 | u32 rising = nmk_chip->rimsc & BIT(offset); |
| 182 | int gpio = nmk_chip->chip.base + offset; |
| 183 | int irq = NOMADIK_GPIO_TO_IRQ(gpio); |
| 184 | struct irq_data *d = irq_get_irq_data(irq); |
| 185 | |
| 186 | if (!rising && !falling) |
| 187 | return; |
| 188 | |
| 189 | if (!d || !irqd_irq_disabled(d)) |
| 190 | return; |
| 191 | |
| 192 | if (rising) { |
| 193 | nmk_chip->rimsc &= ~BIT(offset); |
| 194 | writel_relaxed(nmk_chip->rimsc, |
| 195 | nmk_chip->addr + NMK_GPIO_RIMSC); |
| 196 | } |
| 197 | |
| 198 | if (falling) { |
| 199 | nmk_chip->fimsc &= ~BIT(offset); |
| 200 | writel_relaxed(nmk_chip->fimsc, |
| 201 | nmk_chip->addr + NMK_GPIO_FIMSC); |
| 202 | } |
| 203 | |
| 204 | dev_dbg(nmk_chip->chip.dev, "%d: clearing interrupt mask\n", gpio); |
| 205 | } |
| 206 | |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 207 | static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset, |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 208 | pin_cfg_t cfg, bool sleep, unsigned int *slpmregs) |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 209 | { |
| 210 | static const char *afnames[] = { |
| 211 | [NMK_GPIO_ALT_GPIO] = "GPIO", |
| 212 | [NMK_GPIO_ALT_A] = "A", |
| 213 | [NMK_GPIO_ALT_B] = "B", |
| 214 | [NMK_GPIO_ALT_C] = "C" |
| 215 | }; |
| 216 | static const char *pullnames[] = { |
| 217 | [NMK_GPIO_PULL_NONE] = "none", |
| 218 | [NMK_GPIO_PULL_UP] = "up", |
| 219 | [NMK_GPIO_PULL_DOWN] = "down", |
| 220 | [3] /* illegal */ = "??" |
| 221 | }; |
| 222 | static const char *slpmnames[] = { |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 223 | [NMK_GPIO_SLPM_INPUT] = "input/wakeup", |
| 224 | [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup", |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 225 | }; |
| 226 | |
| 227 | int pin = PIN_NUM(cfg); |
| 228 | int pull = PIN_PULL(cfg); |
| 229 | int af = PIN_ALT(cfg); |
| 230 | int slpm = PIN_SLPM(cfg); |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 231 | int output = PIN_DIR(cfg); |
| 232 | int val = PIN_VAL(cfg); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 233 | bool glitch = af == NMK_GPIO_ALT_C; |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 234 | |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 235 | dev_dbg(nmk_chip->chip.dev, "pin %d [%#lx]: af %s, pull %s, slpm %s (%s%s)\n", |
| 236 | pin, cfg, afnames[af], pullnames[pull], slpmnames[slpm], |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 237 | output ? "output " : "input", |
| 238 | output ? (val ? "high" : "low") : ""); |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 239 | |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 240 | if (sleep) { |
| 241 | int slpm_pull = PIN_SLPM_PULL(cfg); |
| 242 | int slpm_output = PIN_SLPM_DIR(cfg); |
| 243 | int slpm_val = PIN_SLPM_VAL(cfg); |
| 244 | |
Rabin Vincent | 3546d15 | 2010-11-25 11:38:27 +0530 | [diff] [blame] | 245 | af = NMK_GPIO_ALT_GPIO; |
| 246 | |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 247 | /* |
| 248 | * The SLPM_* values are normal values + 1 to allow zero to |
| 249 | * mean "same as normal". |
| 250 | */ |
| 251 | if (slpm_pull) |
| 252 | pull = slpm_pull - 1; |
| 253 | if (slpm_output) |
| 254 | output = slpm_output - 1; |
| 255 | if (slpm_val) |
| 256 | val = slpm_val - 1; |
| 257 | |
| 258 | dev_dbg(nmk_chip->chip.dev, "pin %d: sleep pull %s, dir %s, val %s\n", |
| 259 | pin, |
| 260 | slpm_pull ? pullnames[pull] : "same", |
| 261 | slpm_output ? (output ? "output" : "input") : "same", |
| 262 | slpm_val ? (val ? "high" : "low") : "same"); |
| 263 | } |
| 264 | |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 265 | if (output) |
| 266 | __nmk_gpio_make_output(nmk_chip, offset, val); |
| 267 | else { |
| 268 | __nmk_gpio_make_input(nmk_chip, offset); |
| 269 | __nmk_gpio_set_pull(nmk_chip, offset, pull); |
| 270 | } |
| 271 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 272 | /* |
Rabin Vincent | 6c42ad1 | 2011-05-23 12:22:18 +0530 | [diff] [blame^] | 273 | * If the pin is switching to altfunc, and there was an interrupt |
| 274 | * installed on it which has been lazy disabled, actually mask the |
| 275 | * interrupt to prevent spurious interrupts that would occur while the |
| 276 | * pin is under control of the peripheral. Only SKE does this. |
| 277 | */ |
| 278 | if (af != NMK_GPIO_ALT_GPIO) |
| 279 | nmk_gpio_disable_lazy_irq(nmk_chip, offset); |
| 280 | |
| 281 | /* |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 282 | * If we've backed up the SLPM registers (glitch workaround), modify |
| 283 | * the backups since they will be restored. |
| 284 | */ |
| 285 | if (slpmregs) { |
| 286 | if (slpm == NMK_GPIO_SLPM_NOCHANGE) |
| 287 | slpmregs[nmk_chip->bank] |= BIT(offset); |
| 288 | else |
| 289 | slpmregs[nmk_chip->bank] &= ~BIT(offset); |
| 290 | } else |
| 291 | __nmk_gpio_set_slpm(nmk_chip, offset, slpm); |
| 292 | |
| 293 | __nmk_gpio_set_mode_safe(nmk_chip, offset, af, glitch); |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Safe sequence used to switch IOs between GPIO and Alternate-C mode: |
| 298 | * - Save SLPM registers |
| 299 | * - Set SLPM=0 for the IOs you want to switch and others to 1 |
| 300 | * - Configure the GPIO registers for the IOs that are being switched |
| 301 | * - Set IOFORCE=1 |
| 302 | * - Modify the AFLSA/B registers for the IOs that are being switched |
| 303 | * - Set IOFORCE=0 |
| 304 | * - Restore SLPM registers |
| 305 | * - Any spurious wake up event during switch sequence to be ignored and |
| 306 | * cleared |
| 307 | */ |
| 308 | static void nmk_gpio_glitch_slpm_init(unsigned int *slpm) |
| 309 | { |
| 310 | int i; |
| 311 | |
| 312 | for (i = 0; i < NUM_BANKS; i++) { |
| 313 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 314 | unsigned int temp = slpm[i]; |
| 315 | |
| 316 | if (!chip) |
| 317 | break; |
| 318 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 319 | clk_enable(chip->clk); |
| 320 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 321 | slpm[i] = readl(chip->addr + NMK_GPIO_SLPC); |
| 322 | writel(temp, chip->addr + NMK_GPIO_SLPC); |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | static void nmk_gpio_glitch_slpm_restore(unsigned int *slpm) |
| 327 | { |
| 328 | int i; |
| 329 | |
| 330 | for (i = 0; i < NUM_BANKS; i++) { |
| 331 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 332 | |
| 333 | if (!chip) |
| 334 | break; |
| 335 | |
| 336 | writel(slpm[i], chip->addr + NMK_GPIO_SLPC); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 337 | |
| 338 | clk_disable(chip->clk); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 339 | } |
| 340 | } |
| 341 | |
| 342 | static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep) |
| 343 | { |
| 344 | static unsigned int slpm[NUM_BANKS]; |
| 345 | unsigned long flags; |
| 346 | bool glitch = false; |
| 347 | int ret = 0; |
| 348 | int i; |
| 349 | |
| 350 | for (i = 0; i < num; i++) { |
| 351 | if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) { |
| 352 | glitch = true; |
| 353 | break; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); |
| 358 | |
| 359 | if (glitch) { |
| 360 | memset(slpm, 0xff, sizeof(slpm)); |
| 361 | |
| 362 | for (i = 0; i < num; i++) { |
| 363 | int pin = PIN_NUM(cfgs[i]); |
| 364 | int offset = pin % NMK_GPIO_PER_CHIP; |
| 365 | |
| 366 | if (PIN_ALT(cfgs[i]) == NMK_GPIO_ALT_C) |
| 367 | slpm[pin / NMK_GPIO_PER_CHIP] &= ~BIT(offset); |
| 368 | } |
| 369 | |
| 370 | nmk_gpio_glitch_slpm_init(slpm); |
| 371 | } |
| 372 | |
| 373 | for (i = 0; i < num; i++) { |
| 374 | struct nmk_gpio_chip *nmk_chip; |
| 375 | int pin = PIN_NUM(cfgs[i]); |
| 376 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 377 | nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(pin)); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 378 | if (!nmk_chip) { |
| 379 | ret = -EINVAL; |
| 380 | break; |
| 381 | } |
| 382 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 383 | clk_enable(nmk_chip->clk); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 384 | spin_lock(&nmk_chip->lock); |
| 385 | __nmk_config_pin(nmk_chip, pin - nmk_chip->chip.base, |
| 386 | cfgs[i], sleep, glitch ? slpm : NULL); |
| 387 | spin_unlock(&nmk_chip->lock); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 388 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | if (glitch) |
| 392 | nmk_gpio_glitch_slpm_restore(slpm); |
| 393 | |
| 394 | spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); |
| 395 | |
| 396 | return ret; |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | /** |
| 400 | * nmk_config_pin - configure a pin's mux attributes |
| 401 | * @cfg: pin confguration |
| 402 | * |
| 403 | * Configures a pin's mode (alternate function or GPIO), its pull up status, |
| 404 | * and its sleep mode based on the specified configuration. The @cfg is |
| 405 | * usually one of the SoC specific macros defined in mach/<soc>-pins.h. These |
| 406 | * are constructed using, and can be further enhanced with, the macros in |
| 407 | * plat/pincfg.h. |
| 408 | * |
| 409 | * If a pin's mode is set to GPIO, it is configured as an input to avoid |
| 410 | * side-effects. The gpio can be manipulated later using standard GPIO API |
| 411 | * calls. |
| 412 | */ |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 413 | int nmk_config_pin(pin_cfg_t cfg, bool sleep) |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 414 | { |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 415 | return __nmk_config_pins(&cfg, 1, sleep); |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 416 | } |
| 417 | EXPORT_SYMBOL(nmk_config_pin); |
| 418 | |
| 419 | /** |
| 420 | * nmk_config_pins - configure several pins at once |
| 421 | * @cfgs: array of pin configurations |
| 422 | * @num: number of elments in the array |
| 423 | * |
| 424 | * Configures several pins using nmk_config_pin(). Refer to that function for |
| 425 | * further information. |
| 426 | */ |
| 427 | int nmk_config_pins(pin_cfg_t *cfgs, int num) |
| 428 | { |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 429 | return __nmk_config_pins(cfgs, num, false); |
Rabin Vincent | 378be06 | 2010-06-02 06:06:29 +0100 | [diff] [blame] | 430 | } |
| 431 | EXPORT_SYMBOL(nmk_config_pins); |
| 432 | |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 433 | int nmk_config_pins_sleep(pin_cfg_t *cfgs, int num) |
| 434 | { |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 435 | return __nmk_config_pins(cfgs, num, true); |
Rabin Vincent | dacdc96 | 2010-12-03 20:35:37 +0530 | [diff] [blame] | 436 | } |
| 437 | EXPORT_SYMBOL(nmk_config_pins_sleep); |
| 438 | |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 439 | /** |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 440 | * nmk_gpio_set_slpm() - configure the sleep mode of a pin |
| 441 | * @gpio: pin number |
| 442 | * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE, |
| 443 | * |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 444 | * This register is actually in the pinmux layer, not the GPIO block itself. |
| 445 | * The GPIO1B_SLPM register defines the GPIO mode when SLEEP/DEEP-SLEEP |
| 446 | * mode is entered (i.e. when signal IOFORCE is HIGH by the platform code). |
| 447 | * Each GPIO can be configured to be forced into GPIO mode when IOFORCE is |
| 448 | * HIGH, overriding the normal setting defined by GPIO_AFSELx registers. |
| 449 | * When IOFORCE returns LOW (by software, after SLEEP/DEEP-SLEEP exit), |
| 450 | * the GPIOs return to the normal setting defined by GPIO_AFSELx registers. |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 451 | * |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 452 | * If @mode is NMK_GPIO_SLPM_INPUT, the corresponding GPIO is switched to GPIO |
| 453 | * mode when signal IOFORCE is HIGH (i.e. when SLEEP/DEEP-SLEEP mode is |
| 454 | * entered) regardless of the altfunction selected. Also wake-up detection is |
| 455 | * ENABLED. |
| 456 | * |
| 457 | * If @mode is NMK_GPIO_SLPM_NOCHANGE, the corresponding GPIO remains |
| 458 | * controlled by NMK_GPIO_DATC, NMK_GPIO_DATS, NMK_GPIO_DIR, NMK_GPIO_PDIS |
| 459 | * (for altfunction GPIO) or respective on-chip peripherals (for other |
| 460 | * altfuncs) when IOFORCE is HIGH. Also wake-up detection DISABLED. |
| 461 | * |
| 462 | * Note that enable_irq_wake() will automatically enable wakeup detection. |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 463 | */ |
| 464 | int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode) |
| 465 | { |
| 466 | struct nmk_gpio_chip *nmk_chip; |
| 467 | unsigned long flags; |
| 468 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 469 | nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 470 | if (!nmk_chip) |
| 471 | return -EINVAL; |
| 472 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 473 | clk_enable(nmk_chip->clk); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 474 | spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); |
| 475 | spin_lock(&nmk_chip->lock); |
| 476 | |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 477 | __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 478 | |
| 479 | spin_unlock(&nmk_chip->lock); |
| 480 | spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 481 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 81a3c29 | 2010-05-27 12:39:23 +0100 | [diff] [blame] | 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | /** |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 487 | * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio |
| 488 | * @gpio: pin number |
| 489 | * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE |
| 490 | * |
| 491 | * Enables/disables pull up/down on a specified pin. This only takes effect if |
| 492 | * the pin is configured as an input (either explicitly or by the alternate |
| 493 | * function). |
| 494 | * |
| 495 | * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is |
| 496 | * configured as an input. Otherwise, due to the way the controller registers |
| 497 | * work, this function will change the value output on the pin. |
| 498 | */ |
| 499 | int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull) |
| 500 | { |
| 501 | struct nmk_gpio_chip *nmk_chip; |
| 502 | unsigned long flags; |
| 503 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 504 | nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 505 | if (!nmk_chip) |
| 506 | return -EINVAL; |
| 507 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 508 | clk_enable(nmk_chip->clk); |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 509 | spin_lock_irqsave(&nmk_chip->lock, flags); |
| 510 | __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull); |
| 511 | spin_unlock_irqrestore(&nmk_chip->lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 512 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 5b327ed | 2010-05-27 12:29:50 +0100 | [diff] [blame] | 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 517 | /* Mode functions */ |
Jonas Aaberg | 9c66ee6 | 2010-10-13 13:14:17 +0200 | [diff] [blame] | 518 | /** |
| 519 | * nmk_gpio_set_mode() - set the mux mode of a gpio pin |
| 520 | * @gpio: pin number |
| 521 | * @gpio_mode: one of NMK_GPIO_ALT_GPIO, NMK_GPIO_ALT_A, |
| 522 | * NMK_GPIO_ALT_B, and NMK_GPIO_ALT_C |
| 523 | * |
| 524 | * Sets the mode of the specified pin to one of the alternate functions or |
| 525 | * plain GPIO. |
| 526 | */ |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 527 | int nmk_gpio_set_mode(int gpio, int gpio_mode) |
| 528 | { |
| 529 | struct nmk_gpio_chip *nmk_chip; |
| 530 | unsigned long flags; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 531 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 532 | nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 533 | if (!nmk_chip) |
| 534 | return -EINVAL; |
| 535 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 536 | clk_enable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 537 | spin_lock_irqsave(&nmk_chip->lock, flags); |
Rabin Vincent | 6f9a974 | 2010-06-02 05:50:28 +0100 | [diff] [blame] | 538 | __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 539 | spin_unlock_irqrestore(&nmk_chip->lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 540 | clk_disable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 541 | |
| 542 | return 0; |
| 543 | } |
| 544 | EXPORT_SYMBOL(nmk_gpio_set_mode); |
| 545 | |
| 546 | int nmk_gpio_get_mode(int gpio) |
| 547 | { |
| 548 | struct nmk_gpio_chip *nmk_chip; |
| 549 | u32 afunc, bfunc, bit; |
| 550 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 551 | nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 552 | if (!nmk_chip) |
| 553 | return -EINVAL; |
| 554 | |
| 555 | bit = 1 << (gpio - nmk_chip->chip.base); |
| 556 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 557 | clk_enable(nmk_chip->clk); |
| 558 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 559 | afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; |
| 560 | bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; |
| 561 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 562 | clk_disable(nmk_chip->clk); |
| 563 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 564 | return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); |
| 565 | } |
| 566 | EXPORT_SYMBOL(nmk_gpio_get_mode); |
| 567 | |
| 568 | |
| 569 | /* IRQ functions */ |
| 570 | static inline int nmk_gpio_get_bitmask(int gpio) |
| 571 | { |
| 572 | return 1 << (gpio % 32); |
| 573 | } |
| 574 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 575 | static void nmk_gpio_irq_ack(struct irq_data *d) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 576 | { |
| 577 | int gpio; |
| 578 | struct nmk_gpio_chip *nmk_chip; |
| 579 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 580 | gpio = NOMADIK_IRQ_TO_GPIO(d->irq); |
| 581 | nmk_chip = irq_data_get_irq_chip_data(d); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 582 | if (!nmk_chip) |
| 583 | return; |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 584 | |
| 585 | clk_enable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 586 | writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 587 | clk_disable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 588 | } |
| 589 | |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 590 | enum nmk_gpio_irq_type { |
| 591 | NORMAL, |
| 592 | WAKE, |
| 593 | }; |
| 594 | |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 595 | static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 596 | int gpio, enum nmk_gpio_irq_type which, |
| 597 | bool enable) |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 598 | { |
| 599 | u32 bitmask = nmk_gpio_get_bitmask(gpio); |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 600 | u32 *rimscval; |
| 601 | u32 *fimscval; |
| 602 | u32 rimscreg; |
| 603 | u32 fimscreg; |
| 604 | |
| 605 | if (which == NORMAL) { |
| 606 | rimscreg = NMK_GPIO_RIMSC; |
| 607 | fimscreg = NMK_GPIO_FIMSC; |
| 608 | rimscval = &nmk_chip->rimsc; |
| 609 | fimscval = &nmk_chip->fimsc; |
| 610 | } else { |
| 611 | rimscreg = NMK_GPIO_RWIMSC; |
| 612 | fimscreg = NMK_GPIO_FWIMSC; |
| 613 | rimscval = &nmk_chip->rwimsc; |
| 614 | fimscval = &nmk_chip->fwimsc; |
| 615 | } |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 616 | |
| 617 | /* we must individually set/clear the two edges */ |
| 618 | if (nmk_chip->edge_rising & bitmask) { |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 619 | if (enable) |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 620 | *rimscval |= bitmask; |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 621 | else |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 622 | *rimscval &= ~bitmask; |
| 623 | writel(*rimscval, nmk_chip->addr + rimscreg); |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 624 | } |
| 625 | if (nmk_chip->edge_falling & bitmask) { |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 626 | if (enable) |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 627 | *fimscval |= bitmask; |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 628 | else |
Rabin Vincent | 6c12fe8 | 2011-05-23 12:13:33 +0530 | [diff] [blame] | 629 | *fimscval &= ~bitmask; |
| 630 | writel(*fimscval, nmk_chip->addr + fimscreg); |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 631 | } |
| 632 | } |
| 633 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 634 | static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip, |
| 635 | int gpio, bool on) |
| 636 | { |
Rabin Vincent | b982ff0 | 2011-04-26 09:03:27 +0530 | [diff] [blame] | 637 | /* |
| 638 | * Ensure WAKEUP_ENABLE is on. No need to disable it if wakeup is |
| 639 | * disabled, since setting SLPM to 1 increases power consumption, and |
| 640 | * wakeup is anyhow controlled by the RIMSC and FIMSC registers. |
| 641 | */ |
| 642 | if (nmk_chip->sleepmode && on) { |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 643 | __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, |
Rabin Vincent | b982ff0 | 2011-04-26 09:03:27 +0530 | [diff] [blame] | 644 | NMK_GPIO_SLPM_WAKEUP_ENABLE); |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 645 | } |
| 646 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 647 | __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on); |
| 648 | } |
| 649 | |
| 650 | static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 651 | { |
| 652 | int gpio; |
| 653 | struct nmk_gpio_chip *nmk_chip; |
| 654 | unsigned long flags; |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 655 | u32 bitmask; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 656 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 657 | gpio = NOMADIK_IRQ_TO_GPIO(d->irq); |
| 658 | nmk_chip = irq_data_get_irq_chip_data(d); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 659 | bitmask = nmk_gpio_get_bitmask(gpio); |
| 660 | if (!nmk_chip) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 661 | return -EINVAL; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 662 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 663 | clk_enable(nmk_chip->clk); |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 664 | spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); |
| 665 | spin_lock(&nmk_chip->lock); |
| 666 | |
| 667 | __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, enable); |
| 668 | |
| 669 | if (!(nmk_chip->real_wake & bitmask)) |
| 670 | __nmk_gpio_set_wake(nmk_chip, gpio, enable); |
| 671 | |
| 672 | spin_unlock(&nmk_chip->lock); |
| 673 | spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 674 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 675 | |
| 676 | return 0; |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 677 | } |
| 678 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 679 | static void nmk_gpio_irq_mask(struct irq_data *d) |
Rabin Vincent | 040e5ec | 2010-05-06 10:42:42 +0100 | [diff] [blame] | 680 | { |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 681 | nmk_gpio_irq_maskunmask(d, false); |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 682 | } |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 683 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 684 | static void nmk_gpio_irq_unmask(struct irq_data *d) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 685 | { |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 686 | nmk_gpio_irq_maskunmask(d, true); |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 687 | } |
| 688 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 689 | static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 690 | { |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 691 | struct nmk_gpio_chip *nmk_chip; |
| 692 | unsigned long flags; |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 693 | u32 bitmask; |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 694 | int gpio; |
| 695 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 696 | gpio = NOMADIK_IRQ_TO_GPIO(d->irq); |
| 697 | nmk_chip = irq_data_get_irq_chip_data(d); |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 698 | if (!nmk_chip) |
| 699 | return -EINVAL; |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 700 | bitmask = nmk_gpio_get_bitmask(gpio); |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 701 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 702 | clk_enable(nmk_chip->clk); |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 703 | spin_lock_irqsave(&nmk_gpio_slpm_lock, flags); |
| 704 | spin_lock(&nmk_chip->lock); |
| 705 | |
Linus Walleij | 479a0c7 | 2011-09-20 10:50:15 +0200 | [diff] [blame] | 706 | if (irqd_irq_disabled(d)) |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 707 | __nmk_gpio_set_wake(nmk_chip, gpio, on); |
| 708 | |
| 709 | if (on) |
| 710 | nmk_chip->real_wake |= bitmask; |
| 711 | else |
| 712 | nmk_chip->real_wake &= ~bitmask; |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 713 | |
| 714 | spin_unlock(&nmk_chip->lock); |
| 715 | spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 716 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 7e3f7e5 | 2010-09-02 11:28:05 +0100 | [diff] [blame] | 717 | |
| 718 | return 0; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 719 | } |
| 720 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 721 | static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 722 | { |
Linus Walleij | 479a0c7 | 2011-09-20 10:50:15 +0200 | [diff] [blame] | 723 | bool enabled = !irqd_irq_disabled(d); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 724 | bool wake = irqd_is_wakeup_set(d); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 725 | int gpio; |
| 726 | struct nmk_gpio_chip *nmk_chip; |
| 727 | unsigned long flags; |
| 728 | u32 bitmask; |
| 729 | |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 730 | gpio = NOMADIK_IRQ_TO_GPIO(d->irq); |
| 731 | nmk_chip = irq_data_get_irq_chip_data(d); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 732 | bitmask = nmk_gpio_get_bitmask(gpio); |
| 733 | if (!nmk_chip) |
| 734 | return -EINVAL; |
| 735 | |
| 736 | if (type & IRQ_TYPE_LEVEL_HIGH) |
| 737 | return -EINVAL; |
| 738 | if (type & IRQ_TYPE_LEVEL_LOW) |
| 739 | return -EINVAL; |
| 740 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 741 | clk_enable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 742 | spin_lock_irqsave(&nmk_chip->lock, flags); |
| 743 | |
Rabin Vincent | 7a852d8 | 2010-05-06 10:43:55 +0100 | [diff] [blame] | 744 | if (enabled) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 745 | __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false); |
| 746 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 747 | if (enabled || wake) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 748 | __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false); |
Rabin Vincent | 7a852d8 | 2010-05-06 10:43:55 +0100 | [diff] [blame] | 749 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 750 | nmk_chip->edge_rising &= ~bitmask; |
| 751 | if (type & IRQ_TYPE_EDGE_RISING) |
| 752 | nmk_chip->edge_rising |= bitmask; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 753 | |
| 754 | nmk_chip->edge_falling &= ~bitmask; |
| 755 | if (type & IRQ_TYPE_EDGE_FALLING) |
| 756 | nmk_chip->edge_falling |= bitmask; |
Rabin Vincent | 7a852d8 | 2010-05-06 10:43:55 +0100 | [diff] [blame] | 757 | |
| 758 | if (enabled) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 759 | __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true); |
| 760 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 761 | if (enabled || wake) |
Rabin Vincent | 4d4e20f | 2010-06-16 06:09:34 +0100 | [diff] [blame] | 762 | __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 763 | |
| 764 | spin_unlock_irqrestore(&nmk_chip->lock, flags); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 765 | clk_disable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 766 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 767 | return 0; |
| 768 | } |
| 769 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 770 | static unsigned int nmk_gpio_irq_startup(struct irq_data *d) |
| 771 | { |
| 772 | struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d); |
| 773 | |
| 774 | clk_enable(nmk_chip->clk); |
| 775 | nmk_gpio_irq_unmask(d); |
| 776 | return 0; |
| 777 | } |
| 778 | |
| 779 | static void nmk_gpio_irq_shutdown(struct irq_data *d) |
| 780 | { |
| 781 | struct nmk_gpio_chip *nmk_chip = irq_data_get_irq_chip_data(d); |
| 782 | |
| 783 | nmk_gpio_irq_mask(d); |
| 784 | clk_disable(nmk_chip->clk); |
| 785 | } |
| 786 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 787 | static struct irq_chip nmk_gpio_irq_chip = { |
| 788 | .name = "Nomadik-GPIO", |
Lennert Buytenhek | f272c00 | 2010-11-29 11:16:48 +0100 | [diff] [blame] | 789 | .irq_ack = nmk_gpio_irq_ack, |
| 790 | .irq_mask = nmk_gpio_irq_mask, |
| 791 | .irq_unmask = nmk_gpio_irq_unmask, |
| 792 | .irq_set_type = nmk_gpio_irq_set_type, |
| 793 | .irq_set_wake = nmk_gpio_irq_set_wake, |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 794 | .irq_startup = nmk_gpio_irq_startup, |
| 795 | .irq_shutdown = nmk_gpio_irq_shutdown, |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 796 | }; |
| 797 | |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 798 | static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc, |
| 799 | u32 status) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 800 | { |
| 801 | struct nmk_gpio_chip *nmk_chip; |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 802 | struct irq_chip *host_chip = irq_get_chip(irq); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 803 | unsigned int first_irq; |
| 804 | |
Will Deacon | adfed15 | 2011-02-28 10:12:29 +0000 | [diff] [blame] | 805 | chained_irq_enter(host_chip, desc); |
Rabin Vincent | aaedaa2 | 2010-03-03 04:50:27 +0100 | [diff] [blame] | 806 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 807 | nmk_chip = irq_get_handler_data(irq); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 808 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 809 | while (status) { |
| 810 | int bit = __ffs(status); |
| 811 | |
| 812 | generic_handle_irq(first_irq + bit); |
| 813 | status &= ~BIT(bit); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 814 | } |
Rabin Vincent | aaedaa2 | 2010-03-03 04:50:27 +0100 | [diff] [blame] | 815 | |
Will Deacon | adfed15 | 2011-02-28 10:12:29 +0000 | [diff] [blame] | 816 | chained_irq_exit(host_chip, desc); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 817 | } |
| 818 | |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 819 | static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) |
| 820 | { |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 821 | struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 822 | u32 status; |
| 823 | |
| 824 | clk_enable(nmk_chip->clk); |
| 825 | status = readl(nmk_chip->addr + NMK_GPIO_IS); |
| 826 | clk_disable(nmk_chip->clk); |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 827 | |
| 828 | __nmk_gpio_irq_handler(irq, desc, status); |
| 829 | } |
| 830 | |
| 831 | static void nmk_gpio_secondary_irq_handler(unsigned int irq, |
| 832 | struct irq_desc *desc) |
| 833 | { |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 834 | struct nmk_gpio_chip *nmk_chip = irq_get_handler_data(irq); |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 835 | u32 status = nmk_chip->get_secondary_status(nmk_chip->bank); |
| 836 | |
| 837 | __nmk_gpio_irq_handler(irq, desc, status); |
| 838 | } |
| 839 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 840 | static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) |
| 841 | { |
| 842 | unsigned int first_irq; |
| 843 | int i; |
| 844 | |
| 845 | first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); |
Rabin Vincent | e493e06 | 2010-03-18 12:35:22 +0530 | [diff] [blame] | 846 | for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) { |
Thomas Gleixner | f38c02f | 2011-03-24 13:35:09 +0100 | [diff] [blame] | 847 | irq_set_chip_and_handler(i, &nmk_gpio_irq_chip, |
| 848 | handle_edge_irq); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 849 | set_irq_flags(i, IRQF_VALID); |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 850 | irq_set_chip_data(i, nmk_chip); |
| 851 | irq_set_irq_type(i, IRQ_TYPE_EDGE_FALLING); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 852 | } |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 853 | |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 854 | irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); |
| 855 | irq_set_handler_data(nmk_chip->parent_irq, nmk_chip); |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 856 | |
| 857 | if (nmk_chip->secondary_parent_irq >= 0) { |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 858 | irq_set_chained_handler(nmk_chip->secondary_parent_irq, |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 859 | nmk_gpio_secondary_irq_handler); |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 860 | irq_set_handler_data(nmk_chip->secondary_parent_irq, nmk_chip); |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 861 | } |
| 862 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 863 | return 0; |
| 864 | } |
| 865 | |
| 866 | /* I/O Functions */ |
| 867 | static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) |
| 868 | { |
| 869 | struct nmk_gpio_chip *nmk_chip = |
| 870 | container_of(chip, struct nmk_gpio_chip, chip); |
| 871 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 872 | clk_enable(nmk_chip->clk); |
| 873 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 874 | writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 875 | |
| 876 | clk_disable(nmk_chip->clk); |
| 877 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 878 | return 0; |
| 879 | } |
| 880 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 881 | static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) |
| 882 | { |
| 883 | struct nmk_gpio_chip *nmk_chip = |
| 884 | container_of(chip, struct nmk_gpio_chip, chip); |
| 885 | u32 bit = 1 << offset; |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 886 | int value; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 887 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 888 | clk_enable(nmk_chip->clk); |
| 889 | |
| 890 | value = (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; |
| 891 | |
| 892 | clk_disable(nmk_chip->clk); |
| 893 | |
| 894 | return value; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 895 | } |
| 896 | |
| 897 | static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, |
| 898 | int val) |
| 899 | { |
| 900 | struct nmk_gpio_chip *nmk_chip = |
| 901 | container_of(chip, struct nmk_gpio_chip, chip); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 902 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 903 | clk_enable(nmk_chip->clk); |
| 904 | |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 905 | __nmk_gpio_set_output(nmk_chip, offset, val); |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 906 | |
| 907 | clk_disable(nmk_chip->clk); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 908 | } |
| 909 | |
Rabin Vincent | 6647c6c | 2010-05-27 12:22:42 +0100 | [diff] [blame] | 910 | static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, |
| 911 | int val) |
| 912 | { |
| 913 | struct nmk_gpio_chip *nmk_chip = |
| 914 | container_of(chip, struct nmk_gpio_chip, chip); |
| 915 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 916 | clk_enable(nmk_chip->clk); |
| 917 | |
Rabin Vincent | 6720db7 | 2010-09-02 11:28:48 +0100 | [diff] [blame] | 918 | __nmk_gpio_make_output(nmk_chip, offset, val); |
Rabin Vincent | 6647c6c | 2010-05-27 12:22:42 +0100 | [diff] [blame] | 919 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 920 | clk_disable(nmk_chip->clk); |
| 921 | |
Rabin Vincent | 6647c6c | 2010-05-27 12:22:42 +0100 | [diff] [blame] | 922 | return 0; |
| 923 | } |
| 924 | |
Rabin Vincent | 0d2aec9 | 2010-06-16 06:10:43 +0100 | [diff] [blame] | 925 | static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| 926 | { |
| 927 | struct nmk_gpio_chip *nmk_chip = |
| 928 | container_of(chip, struct nmk_gpio_chip, chip); |
| 929 | |
| 930 | return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset; |
| 931 | } |
| 932 | |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 933 | #ifdef CONFIG_DEBUG_FS |
| 934 | |
| 935 | #include <linux/seq_file.h> |
| 936 | |
| 937 | static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) |
| 938 | { |
| 939 | int mode; |
| 940 | unsigned i; |
| 941 | unsigned gpio = chip->base; |
| 942 | int is_out; |
| 943 | struct nmk_gpio_chip *nmk_chip = |
| 944 | container_of(chip, struct nmk_gpio_chip, chip); |
| 945 | const char *modes[] = { |
| 946 | [NMK_GPIO_ALT_GPIO] = "gpio", |
| 947 | [NMK_GPIO_ALT_A] = "altA", |
| 948 | [NMK_GPIO_ALT_B] = "altB", |
| 949 | [NMK_GPIO_ALT_C] = "altC", |
| 950 | }; |
| 951 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 952 | clk_enable(nmk_chip->clk); |
| 953 | |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 954 | for (i = 0; i < chip->ngpio; i++, gpio++) { |
| 955 | const char *label = gpiochip_is_requested(chip, i); |
| 956 | bool pull; |
| 957 | u32 bit = 1 << i; |
| 958 | |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 959 | is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit; |
| 960 | pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit); |
| 961 | mode = nmk_gpio_get_mode(gpio); |
| 962 | seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s", |
Rabin Vincent | 8ea72a3 | 2011-05-24 23:07:09 +0200 | [diff] [blame] | 963 | gpio, label ?: "(none)", |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 964 | is_out ? "out" : "in ", |
| 965 | chip->get |
| 966 | ? (chip->get(chip, i) ? "hi" : "lo") |
| 967 | : "? ", |
| 968 | (mode < 0) ? "unknown" : modes[mode], |
| 969 | pull ? "pull" : "none"); |
Rabin Vincent | 8ea72a3 | 2011-05-24 23:07:09 +0200 | [diff] [blame] | 970 | |
| 971 | if (label && !is_out) { |
| 972 | int irq = gpio_to_irq(gpio); |
| 973 | struct irq_desc *desc = irq_to_desc(irq); |
| 974 | |
| 975 | /* This races with request_irq(), set_irq_type(), |
| 976 | * and set_irq_wake() ... but those are "rare". |
| 977 | */ |
| 978 | if (irq >= 0 && desc->action) { |
| 979 | char *trigger; |
| 980 | u32 bitmask = nmk_gpio_get_bitmask(gpio); |
| 981 | |
| 982 | if (nmk_chip->edge_rising & bitmask) |
| 983 | trigger = "edge-rising"; |
| 984 | else if (nmk_chip->edge_falling & bitmask) |
| 985 | trigger = "edge-falling"; |
| 986 | else |
| 987 | trigger = "edge-undefined"; |
| 988 | |
| 989 | seq_printf(s, " irq-%d %s%s", |
| 990 | irq, trigger, |
| 991 | irqd_is_wakeup_set(&desc->irq_data) |
| 992 | ? " wakeup" : ""); |
| 993 | } |
| 994 | } |
| 995 | |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 996 | seq_printf(s, "\n"); |
| 997 | } |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 998 | |
| 999 | clk_disable(nmk_chip->clk); |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 1000 | } |
| 1001 | |
| 1002 | #else |
| 1003 | #define nmk_gpio_dbg_show NULL |
| 1004 | #endif |
| 1005 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1006 | /* This structure is replicated for each GPIO block allocated at probe time */ |
| 1007 | static struct gpio_chip nmk_gpio_template = { |
| 1008 | .direction_input = nmk_gpio_make_input, |
| 1009 | .get = nmk_gpio_get_input, |
| 1010 | .direction_output = nmk_gpio_make_output, |
| 1011 | .set = nmk_gpio_set_output, |
Rabin Vincent | 0d2aec9 | 2010-06-16 06:10:43 +0100 | [diff] [blame] | 1012 | .to_irq = nmk_gpio_to_irq, |
Rabin Vincent | d0b543c | 2010-03-04 17:39:05 +0530 | [diff] [blame] | 1013 | .dbg_show = nmk_gpio_dbg_show, |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1014 | .can_sleep = 0, |
| 1015 | }; |
| 1016 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 1017 | void nmk_gpio_clocks_enable(void) |
| 1018 | { |
| 1019 | int i; |
| 1020 | |
| 1021 | for (i = 0; i < NUM_BANKS; i++) { |
| 1022 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 1023 | |
| 1024 | if (!chip) |
| 1025 | continue; |
| 1026 | |
| 1027 | clk_enable(chip->clk); |
| 1028 | } |
| 1029 | } |
| 1030 | |
| 1031 | void nmk_gpio_clocks_disable(void) |
| 1032 | { |
| 1033 | int i; |
| 1034 | |
| 1035 | for (i = 0; i < NUM_BANKS; i++) { |
| 1036 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 1037 | |
| 1038 | if (!chip) |
| 1039 | continue; |
| 1040 | |
| 1041 | clk_disable(chip->clk); |
| 1042 | } |
| 1043 | } |
| 1044 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 1045 | /* |
| 1046 | * Called from the suspend/resume path to only keep the real wakeup interrupts |
| 1047 | * (those that have had set_irq_wake() called on them) as wakeup interrupts, |
| 1048 | * and not the rest of the interrupts which we needed to have as wakeups for |
| 1049 | * cpuidle. |
| 1050 | * |
| 1051 | * PM ops are not used since this needs to be done at the end, after all the |
| 1052 | * other drivers are done with their suspend callbacks. |
| 1053 | */ |
| 1054 | void nmk_gpio_wakeups_suspend(void) |
| 1055 | { |
| 1056 | int i; |
| 1057 | |
| 1058 | for (i = 0; i < NUM_BANKS; i++) { |
| 1059 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 1060 | |
| 1061 | if (!chip) |
| 1062 | break; |
| 1063 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 1064 | clk_enable(chip->clk); |
| 1065 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 1066 | writel(chip->rwimsc & chip->real_wake, |
| 1067 | chip->addr + NMK_GPIO_RWIMSC); |
| 1068 | writel(chip->fwimsc & chip->real_wake, |
| 1069 | chip->addr + NMK_GPIO_FWIMSC); |
| 1070 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 1071 | clk_disable(chip->clk); |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 1072 | } |
| 1073 | } |
| 1074 | |
| 1075 | void nmk_gpio_wakeups_resume(void) |
| 1076 | { |
| 1077 | int i; |
| 1078 | |
| 1079 | for (i = 0; i < NUM_BANKS; i++) { |
| 1080 | struct nmk_gpio_chip *chip = nmk_gpio_chips[i]; |
| 1081 | |
| 1082 | if (!chip) |
| 1083 | break; |
| 1084 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 1085 | clk_enable(chip->clk); |
| 1086 | |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 1087 | writel(chip->rwimsc, chip->addr + NMK_GPIO_RWIMSC); |
| 1088 | writel(chip->fwimsc, chip->addr + NMK_GPIO_FWIMSC); |
| 1089 | |
Rabin Vincent | 3c0227d | 2011-09-20 10:50:03 +0200 | [diff] [blame] | 1090 | clk_disable(chip->clk); |
Rabin Vincent | b9df468 | 2011-02-10 11:45:58 +0530 | [diff] [blame] | 1091 | } |
| 1092 | } |
| 1093 | |
Rickard Andersson | bc6f5cf | 2011-05-24 23:07:17 +0200 | [diff] [blame] | 1094 | /* |
| 1095 | * Read the pull up/pull down status. |
| 1096 | * A bit set in 'pull_up' means that pull up |
| 1097 | * is selected if pull is enabled in PDIS register. |
| 1098 | * Note: only pull up/down set via this driver can |
| 1099 | * be detected due to HW limitations. |
| 1100 | */ |
| 1101 | void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up) |
| 1102 | { |
| 1103 | if (gpio_bank < NUM_BANKS) { |
| 1104 | struct nmk_gpio_chip *chip = nmk_gpio_chips[gpio_bank]; |
| 1105 | |
| 1106 | if (!chip) |
| 1107 | return; |
| 1108 | |
| 1109 | *pull_up = chip->pull_up; |
| 1110 | } |
| 1111 | } |
| 1112 | |
Uwe Kleine-König | fd0d67d | 2010-09-02 16:13:35 +0100 | [diff] [blame] | 1113 | static int __devinit nmk_gpio_probe(struct platform_device *dev) |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1114 | { |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1115 | struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1116 | struct nmk_gpio_chip *nmk_chip; |
| 1117 | struct gpio_chip *chip; |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1118 | struct resource *res; |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 1119 | struct clk *clk; |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 1120 | int secondary_irq; |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1121 | int irq; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1122 | int ret; |
| 1123 | |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1124 | if (!pdata) |
| 1125 | return -ENODEV; |
| 1126 | |
| 1127 | res = platform_get_resource(dev, IORESOURCE_MEM, 0); |
| 1128 | if (!res) { |
| 1129 | ret = -ENOENT; |
| 1130 | goto out; |
| 1131 | } |
| 1132 | |
| 1133 | irq = platform_get_irq(dev, 0); |
| 1134 | if (irq < 0) { |
| 1135 | ret = irq; |
| 1136 | goto out; |
| 1137 | } |
| 1138 | |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 1139 | secondary_irq = platform_get_irq(dev, 1); |
| 1140 | if (secondary_irq >= 0 && !pdata->get_secondary_status) { |
| 1141 | ret = -EINVAL; |
| 1142 | goto out; |
| 1143 | } |
| 1144 | |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1145 | if (request_mem_region(res->start, resource_size(res), |
| 1146 | dev_name(&dev->dev)) == NULL) { |
| 1147 | ret = -EBUSY; |
| 1148 | goto out; |
| 1149 | } |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1150 | |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 1151 | clk = clk_get(&dev->dev, NULL); |
| 1152 | if (IS_ERR(clk)) { |
| 1153 | ret = PTR_ERR(clk); |
| 1154 | goto out_release; |
| 1155 | } |
| 1156 | |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1157 | nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); |
| 1158 | if (!nmk_chip) { |
| 1159 | ret = -ENOMEM; |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 1160 | goto out_clk; |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1161 | } |
| 1162 | /* |
| 1163 | * The virt address in nmk_chip->addr is in the nomadik register space, |
| 1164 | * so we can simply convert the resource address, without remapping |
| 1165 | */ |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 1166 | nmk_chip->bank = dev->id; |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 1167 | nmk_chip->clk = clk; |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1168 | nmk_chip->addr = io_p2v(res->start); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1169 | nmk_chip->chip = nmk_gpio_template; |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1170 | nmk_chip->parent_irq = irq; |
Rabin Vincent | 33b744b | 2010-10-14 10:38:03 +0530 | [diff] [blame] | 1171 | nmk_chip->secondary_parent_irq = secondary_irq; |
| 1172 | nmk_chip->get_secondary_status = pdata->get_secondary_status; |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 1173 | nmk_chip->set_ioforce = pdata->set_ioforce; |
Linus Walleij | 33d7864 | 2011-06-09 11:08:47 +0200 | [diff] [blame] | 1174 | nmk_chip->sleepmode = pdata->supports_sleepmode; |
Rabin Vincent | c0fcb8d | 2010-03-03 04:48:54 +0100 | [diff] [blame] | 1175 | spin_lock_init(&nmk_chip->lock); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1176 | |
| 1177 | chip = &nmk_chip->chip; |
| 1178 | chip->base = pdata->first_gpio; |
Rabin Vincent | e493e06 | 2010-03-18 12:35:22 +0530 | [diff] [blame] | 1179 | chip->ngpio = pdata->num_gpio; |
Rabin Vincent | 8d568ae | 2010-12-08 11:07:54 +0530 | [diff] [blame] | 1180 | chip->label = pdata->name ?: dev_name(&dev->dev); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1181 | chip->dev = &dev->dev; |
| 1182 | chip->owner = THIS_MODULE; |
| 1183 | |
| 1184 | ret = gpiochip_add(&nmk_chip->chip); |
| 1185 | if (ret) |
| 1186 | goto out_free; |
| 1187 | |
Rabin Vincent | 01727e6 | 2010-12-13 12:02:40 +0530 | [diff] [blame] | 1188 | BUG_ON(nmk_chip->bank >= ARRAY_SIZE(nmk_gpio_chips)); |
| 1189 | |
| 1190 | nmk_gpio_chips[nmk_chip->bank] = nmk_chip; |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1191 | platform_set_drvdata(dev, nmk_chip); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1192 | |
| 1193 | nmk_gpio_init_irq(nmk_chip); |
| 1194 | |
Grant Likely | 64842aa | 2011-11-06 11:36:18 -0700 | [diff] [blame] | 1195 | dev_info(&dev->dev, "at address %p\n", |
| 1196 | nmk_chip->addr); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1197 | return 0; |
| 1198 | |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1199 | out_free: |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1200 | kfree(nmk_chip); |
Rabin Vincent | af7dc22 | 2010-05-06 11:14:17 +0100 | [diff] [blame] | 1201 | out_clk: |
| 1202 | clk_disable(clk); |
| 1203 | clk_put(clk); |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1204 | out_release: |
| 1205 | release_mem_region(res->start, resource_size(res)); |
| 1206 | out: |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1207 | dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, |
| 1208 | pdata->first_gpio, pdata->first_gpio+31); |
| 1209 | return ret; |
| 1210 | } |
| 1211 | |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1212 | static struct platform_driver nmk_gpio_driver = { |
| 1213 | .driver = { |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1214 | .owner = THIS_MODULE, |
| 1215 | .name = "gpio", |
Rabin Vincent | 5317e4d1 | 2011-02-10 09:29:53 +0530 | [diff] [blame] | 1216 | }, |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1217 | .probe = nmk_gpio_probe, |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1218 | }; |
| 1219 | |
| 1220 | static int __init nmk_gpio_init(void) |
| 1221 | { |
Rabin Vincent | 3e3c62c | 2010-03-03 04:52:34 +0100 | [diff] [blame] | 1222 | return platform_driver_register(&nmk_gpio_driver); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1223 | } |
| 1224 | |
Rabin Vincent | 33f45ea | 2010-06-02 06:09:52 +0100 | [diff] [blame] | 1225 | core_initcall(nmk_gpio_init); |
Alessandro Rubini | 2ec1d35 | 2009-07-02 15:29:12 +0100 | [diff] [blame] | 1226 | |
| 1227 | MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); |
| 1228 | MODULE_DESCRIPTION("Nomadik GPIO Driver"); |
| 1229 | MODULE_LICENSE("GPL"); |