| 1 | --- /dev/null |
| 2 | +++ b/arch/arm/plat-fa/gpio.c |
| 3 | @@ -0,0 +1,283 @@ |
| 4 | +/* |
| 5 | + * Gpiochip and interrupt routines for Faraday FA526 based SoCs |
| 6 | + * |
| 7 | + * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
| 8 | + * Copyright (C) 2010-2012 Gabor Juhos <juhosg@openwrt.org> |
| 9 | + * |
| 10 | + * Based on plat-mxc/gpio.c: |
| 11 | + * MXC GPIO supchip. (c) 2008 Daniel Mack <daniel@caiaq.de> |
| 12 | + * Copyright 2008 Juergen Beisert, kernel@pengutronix.de |
| 13 | + * |
| 14 | + * This program is free software; you can redistribute it and/or modify |
| 15 | + * it under the terms of the GNU General Public License as published by |
| 16 | + * the Free Software Foundation; either version 2 of the License, or |
| 17 | + * (at your option) any later version. |
| 18 | + */ |
| 19 | + |
| 20 | +#include <linux/spinlock.h> |
| 21 | + |
| 22 | +#include <plat/gpio.h> |
| 23 | + |
| 24 | +#define GPIO_DATA_OUT 0x0 |
| 25 | +#define GPIO_DATA_IN 0x4 |
| 26 | +#define GPIO_DIR 0x8 |
| 27 | +#define GPIO_DATA_SET 0x10 |
| 28 | +#define GPIO_DATA_CLR 0x14 |
| 29 | +#define GPIO_PULL_EN 0x18 |
| 30 | +#define GPIO_PULL_TYPE 0x1C |
| 31 | +#define GPIO_INT_EN 0x20 |
| 32 | +#define GPIO_INT_STAT 0x24 |
| 33 | +#define GPIO_INT_MASK 0x2C |
| 34 | +#define GPIO_INT_CLR 0x30 |
| 35 | +#define GPIO_INT_TYPE 0x34 |
| 36 | +#define GPIO_INT_BOTH_EDGE 0x38 |
| 37 | +#define GPIO_INT_LEVEL 0x3C |
| 38 | +#define GPIO_DEBOUNCE_EN 0x40 |
| 39 | +#define GPIO_DEBOUNCE_PRESCALE 0x44 |
| 40 | + |
| 41 | +#define GPIO_REGS_SIZE 0x48 |
| 42 | + |
| 43 | +static DEFINE_SPINLOCK(fa_gpio_lock); |
| 44 | + |
| 45 | +static inline struct fa_gpio_chip *to_fgc(struct gpio_chip *chip) |
| 46 | +{ |
| 47 | + return container_of(chip, struct fa_gpio_chip, gpio_chip); |
| 48 | +} |
| 49 | + |
| 50 | +static void _fa_gpio_irq_setenable(struct irq_data *d, int enable) |
| 51 | +{ |
| 52 | + struct fa_gpio_chip *fgc = irq_get_chip_data(d->irq); |
| 53 | + void __iomem *base = fgc->mem_base; |
| 54 | + unsigned int gpio = d->irq - fgc->irq_base; |
| 55 | + unsigned int reg; |
| 56 | + |
| 57 | + reg = __raw_readl(base + GPIO_INT_EN); |
| 58 | + reg = (reg & (~(1 << gpio))) | (!!enable << gpio); |
| 59 | + __raw_writel(reg, base + GPIO_INT_EN); |
| 60 | +} |
| 61 | + |
| 62 | +static void fa_gpio_irq_ack(struct irq_data *d) |
| 63 | +{ |
| 64 | + struct fa_gpio_chip *fgc = irq_get_chip_data(d->irq); |
| 65 | + unsigned int gpio = d->irq - fgc->irq_base; |
| 66 | + |
| 67 | + __raw_writel(1 << gpio, fgc->mem_base + GPIO_INT_CLR); |
| 68 | +} |
| 69 | + |
| 70 | +static void fa_gpio_irq_mask(struct irq_data *d) |
| 71 | +{ |
| 72 | + _fa_gpio_irq_setenable(d, 0); |
| 73 | +} |
| 74 | + |
| 75 | +static void fa_gpio_irq_unmask(struct irq_data *d) |
| 76 | +{ |
| 77 | + _fa_gpio_irq_setenable(d, 1); |
| 78 | +} |
| 79 | + |
| 80 | +static int fa_gpio_irq_set_type(struct irq_data *d, unsigned int type) |
| 81 | +{ |
| 82 | + struct fa_gpio_chip *fgc = irq_get_chip_data(d->irq); |
| 83 | + void __iomem *base = fgc->mem_base; |
| 84 | + unsigned int gpio = d->irq - fgc->irq_base; |
| 85 | + unsigned int gpio_mask = 1 << gpio; |
| 86 | + unsigned int reg_both, reg_level, reg_type; |
| 87 | + |
| 88 | + reg_type = __raw_readl(base + GPIO_INT_TYPE); |
| 89 | + reg_level = __raw_readl(base + GPIO_INT_LEVEL); |
| 90 | + reg_both = __raw_readl(base + GPIO_INT_BOTH_EDGE); |
| 91 | + |
| 92 | + switch (type) { |
| 93 | + case IRQ_TYPE_EDGE_BOTH: |
| 94 | + reg_type &= ~gpio_mask; |
| 95 | + reg_both |= gpio_mask; |
| 96 | + break; |
| 97 | + case IRQ_TYPE_EDGE_RISING: |
| 98 | + reg_type &= ~gpio_mask; |
| 99 | + reg_both &= ~gpio_mask; |
| 100 | + reg_level &= ~gpio_mask; |
| 101 | + break; |
| 102 | + case IRQ_TYPE_EDGE_FALLING: |
| 103 | + reg_type &= ~gpio_mask; |
| 104 | + reg_both &= ~gpio_mask; |
| 105 | + reg_level |= gpio_mask; |
| 106 | + break; |
| 107 | + case IRQ_TYPE_LEVEL_HIGH: |
| 108 | + reg_type |= gpio_mask; |
| 109 | + reg_level &= ~gpio_mask; |
| 110 | + break; |
| 111 | + case IRQ_TYPE_LEVEL_LOW: |
| 112 | + reg_type |= gpio_mask; |
| 113 | + reg_level |= gpio_mask; |
| 114 | + break; |
| 115 | + default: |
| 116 | + return -EINVAL; |
| 117 | + } |
| 118 | + |
| 119 | + __raw_writel(reg_type, base + GPIO_INT_TYPE); |
| 120 | + __raw_writel(reg_level, base + GPIO_INT_LEVEL); |
| 121 | + __raw_writel(reg_both, base + GPIO_INT_BOTH_EDGE); |
| 122 | + |
| 123 | + fa_gpio_irq_ack(d); |
| 124 | + |
| 125 | + return 0; |
| 126 | +} |
| 127 | + |
| 128 | +static void fa_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) |
| 129 | +{ |
| 130 | + struct fa_gpio_data *data = irq_get_handler_data(irq); |
| 131 | + unsigned int chip; |
| 132 | + |
| 133 | + for (chip = 0; chip < data->nchips; chip++) { |
| 134 | + struct fa_gpio_chip *fgc = &data->chips[chip]; |
| 135 | + unsigned int status; |
| 136 | + unsigned int i; |
| 137 | + |
| 138 | + status = __raw_readl(fgc->mem_base + GPIO_INT_STAT); |
| 139 | + for (i = fgc->irq_base; status != 0; status >>= 1, i++) { |
| 140 | + if ((status & 1) == 0) |
| 141 | + continue; |
| 142 | + |
| 143 | + BUG_ON(!(irq_desc[i].handle_irq)); |
| 144 | + irq_desc[i].handle_irq(i, &irq_desc[i]); |
| 145 | + } |
| 146 | + } |
| 147 | +} |
| 148 | + |
| 149 | +static struct irq_chip fa_gpio_irq_chip = { |
| 150 | + .name = "GPIO", |
| 151 | + .irq_ack = fa_gpio_irq_ack, |
| 152 | + .irq_mask = fa_gpio_irq_mask, |
| 153 | + .irq_unmask = fa_gpio_irq_unmask, |
| 154 | + .irq_set_type = fa_gpio_irq_set_type, |
| 155 | +}; |
| 156 | + |
| 157 | +static void _fa_gpio_set_direction(struct fa_gpio_chip *fgc, unsigned offset, |
| 158 | + int is_output) |
| 159 | +{ |
| 160 | + unsigned int reg; |
| 161 | + |
| 162 | + reg = __raw_readl(fgc->mem_base + GPIO_DIR); |
| 163 | + if (is_output) |
| 164 | + reg |= 1 << offset; |
| 165 | + else |
| 166 | + reg &= ~(1 << offset); |
| 167 | + __raw_writel(reg, fgc->mem_base + GPIO_DIR); |
| 168 | +} |
| 169 | + |
| 170 | +static void _fa_gpio_set(struct fa_gpio_chip *fgc, unsigned offset, int value) |
| 171 | +{ |
| 172 | + if (value) |
| 173 | + __raw_writel(1 << offset, fgc->mem_base + GPIO_DATA_SET); |
| 174 | + else |
| 175 | + __raw_writel(1 << offset, fgc->mem_base + GPIO_DATA_CLR); |
| 176 | +} |
| 177 | + |
| 178 | +static void fa_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 179 | +{ |
| 180 | + struct fa_gpio_chip *fgc = to_fgc(chip); |
| 181 | + |
| 182 | + _fa_gpio_set(fgc, offset, value); |
| 183 | +} |
| 184 | + |
| 185 | +static int fa_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 186 | +{ |
| 187 | + struct fa_gpio_chip *fgc = to_fgc(chip); |
| 188 | + |
| 189 | + return (__raw_readl(fgc->mem_base + GPIO_DATA_IN) >> offset) & 1; |
| 190 | +} |
| 191 | + |
| 192 | +static int fa_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| 193 | +{ |
| 194 | + struct fa_gpio_chip *fgc = to_fgc(chip); |
| 195 | + |
| 196 | + return fgc->irq_base + offset; |
| 197 | +} |
| 198 | + |
| 199 | +static int fa_gpio_direction_input(struct gpio_chip *chip, unsigned offset) |
| 200 | +{ |
| 201 | + struct fa_gpio_chip *fgc = to_fgc(chip); |
| 202 | + unsigned long flags; |
| 203 | + |
| 204 | + spin_lock_irqsave(&fa_gpio_lock, flags); |
| 205 | + |
| 206 | + _fa_gpio_set_direction(fgc, offset, 0); |
| 207 | + |
| 208 | + spin_unlock_irqrestore(&fa_gpio_lock, flags); |
| 209 | + |
| 210 | + return 0; |
| 211 | +} |
| 212 | + |
| 213 | +static int fa_gpio_direction_output(struct gpio_chip *chip, |
| 214 | + unsigned offset, |
| 215 | + int value) |
| 216 | +{ |
| 217 | + struct fa_gpio_chip *fgc = to_fgc(chip); |
| 218 | + unsigned long flags; |
| 219 | + |
| 220 | + spin_lock_irqsave(&fa_gpio_lock, flags); |
| 221 | + |
| 222 | + _fa_gpio_set(fgc, offset, value); |
| 223 | + _fa_gpio_set_direction(fgc, offset, 1); |
| 224 | + |
| 225 | + spin_unlock_irqrestore(&fa_gpio_lock, flags); |
| 226 | + |
| 227 | + return 0; |
| 228 | +} |
| 229 | + |
| 230 | +static int fa_gpio_init_chip(struct fa_gpio_chip *fgc) |
| 231 | +{ |
| 232 | + void __iomem *mem_base; |
| 233 | + unsigned int i; |
| 234 | + int err; |
| 235 | + |
| 236 | + mem_base = ioremap(fgc->map_base, GPIO_REGS_SIZE); |
| 237 | + if (!mem_base) |
| 238 | + return -ENXIO; |
| 239 | + |
| 240 | + fgc->mem_base = mem_base; |
| 241 | + |
| 242 | + fgc->gpio_chip.direction_input = fa_gpio_direction_input; |
| 243 | + fgc->gpio_chip.direction_output = fa_gpio_direction_output; |
| 244 | + fgc->gpio_chip.get = fa_gpio_get; |
| 245 | + fgc->gpio_chip.set = fa_gpio_set; |
| 246 | + fgc->gpio_chip.to_irq = fa_gpio_to_irq; |
| 247 | + |
| 248 | + /* disable, unmask and clear all interrupts */ |
| 249 | + __raw_writel(0x0, mem_base + GPIO_INT_EN); |
| 250 | + __raw_writel(0x0, mem_base + GPIO_INT_MASK); |
| 251 | + __raw_writel(~0x0, mem_base + GPIO_INT_CLR); |
| 252 | + |
| 253 | + for (i = fgc->irq_base; |
| 254 | + i < fgc->irq_base + fgc->gpio_chip.ngpio; i++) { |
| 255 | + irq_set_chip(i, &fa_gpio_irq_chip); |
| 256 | + irq_set_chip_data(i, fgc); |
| 257 | + irq_set_handler(i, handle_edge_irq); |
| 258 | + set_irq_flags(i, IRQF_VALID); |
| 259 | + } |
| 260 | + |
| 261 | + err = gpiochip_add(&fgc->gpio_chip); |
| 262 | + if (err) |
| 263 | + goto unmap; |
| 264 | + |
| 265 | + return 0; |
| 266 | + |
| 267 | + unmap: |
| 268 | + iounmap(fgc->mem_base); |
| 269 | + return err; |
| 270 | +} |
| 271 | + |
| 272 | +void __init fa_gpio_init(struct fa_gpio_data *data) |
| 273 | +{ |
| 274 | + unsigned int i; |
| 275 | + |
| 276 | + for (i = 0; i < data->nchips; i++) { |
| 277 | + int err; |
| 278 | + |
| 279 | + err = fa_gpio_init_chip(&data->chips[i]); |
| 280 | + if (WARN(err, "GPIO init failed\n")) |
| 281 | + return; |
| 282 | + } |
| 283 | + |
| 284 | + irq_set_chained_handler(data->irq, fa_gpio_irq_handler); |
| 285 | + irq_set_handler_data(data->irq, data); |
| 286 | +} |
| 287 | --- /dev/null |
| 288 | +++ b/arch/arm/plat-fa/include/plat/gpio.h |
| 289 | @@ -0,0 +1,33 @@ |
| 290 | +/* |
| 291 | + * Copyright (c) 2010-2012 Gabor Juhos <juhosg@openwrt.org> |
| 292 | + * |
| 293 | + * This file is free software; you can redistribute it and/or modify |
| 294 | + * it under the terms of the GNU General Public License, Version 2, as |
| 295 | + * published by the Free Software Foundation. |
| 296 | + */ |
| 297 | + |
| 298 | +#ifndef _FA_GPIO_H |
| 299 | +#define _FA_GPIO_H |
| 300 | + |
| 301 | +#include <linux/init.h> |
| 302 | +#include <linux/gpio.h> |
| 303 | +#include <linux/irq.h> |
| 304 | +#include <linux/io.h> |
| 305 | + |
| 306 | +struct fa_gpio_chip { |
| 307 | + struct gpio_chip gpio_chip; |
| 308 | + unsigned int map_base; |
| 309 | + unsigned int irq_base; |
| 310 | + |
| 311 | + void __iomem *mem_base; |
| 312 | +}; |
| 313 | + |
| 314 | +struct fa_gpio_data { |
| 315 | + struct fa_gpio_chip *chips; |
| 316 | + unsigned int nchips; |
| 317 | + unsigned int irq; |
| 318 | +}; |
| 319 | + |
| 320 | +void __init fa_gpio_init(struct fa_gpio_data *data); |
| 321 | + |
| 322 | +#endif /* _FA_GPIO_H */ |
| 323 | --- a/arch/arm/plat-fa/Kconfig |
| 324 | +++ b/arch/arm/plat-fa/Kconfig |
| 325 | @@ -1,5 +1,8 @@ |
| 326 | if PLAT_FA |
| 327 | |
| 328 | +config PLAT_FA_GPIO |
| 329 | + def_bool n |
| 330 | + |
| 331 | config PLAT_FA_TIME |
| 332 | def_bool n |
| 333 | |
| 334 | --- a/arch/arm/plat-fa/Makefile |
| 335 | +++ b/arch/arm/plat-fa/Makefile |
| 336 | @@ -4,6 +4,7 @@ |
| 337 | |
| 338 | obj-y := |
| 339 | |
| 340 | +obj-$(CONFIG_PLAT_FA_GPIO) += gpio.o |
| 341 | obj-$(CONFIG_PLAT_FA_TIME) += time.o |
| 342 | |
| 343 | obj-m := |
| 344 | |
