Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * TI DaVinci GPIO Support |
| 3 | * |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 4 | * Copyright (c) 2006-2007 David Brownell |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 5 | * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/errno.h> |
| 14 | #include <linux/kernel.h> |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 15 | #include <linux/clk.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/io.h> |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 18 | |
Russell King | a09e64f | 2008-08-05 16:14:15 +0100 | [diff] [blame] | 19 | #include <mach/gpio.h> |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 20 | |
| 21 | #include <asm/mach/irq.h> |
| 22 | |
| 23 | static DEFINE_SPINLOCK(gpio_lock); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 24 | |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 25 | #define chip2controller(chip) \ |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 26 | container_of(chip, struct davinci_gpio_controller, chip) |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 27 | |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 28 | static struct davinci_gpio_controller chips[DIV_ROUND_UP(DAVINCI_N_GPIO, 32)]; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 29 | |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 30 | /* create a non-inlined version */ |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 31 | static struct davinci_gpio_regs __iomem __init *gpio2regs(unsigned gpio) |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 32 | { |
| 33 | return __gpio_to_controller(gpio); |
| 34 | } |
| 35 | |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 36 | static inline struct davinci_gpio_regs __iomem *irq2regs(int irq) |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 37 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 38 | struct davinci_gpio_regs __iomem *g; |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 39 | |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 40 | g = (__force struct davinci_gpio_regs __iomem *)get_irq_chip_data(irq); |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 41 | |
| 42 | return g; |
| 43 | } |
| 44 | |
Kevin Hilman | dc75602 | 2009-05-11 11:04:53 -0700 | [diff] [blame] | 45 | static int __init davinci_gpio_irq_setup(void); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 46 | |
| 47 | /*--------------------------------------------------------------------------*/ |
| 48 | |
| 49 | /* |
| 50 | * board setup code *MUST* set PINMUX0 and PINMUX1 as |
| 51 | * needed, and enable the GPIO clock. |
| 52 | */ |
| 53 | |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 54 | static inline int __davinci_direction(struct gpio_chip *chip, |
| 55 | unsigned offset, bool out, int value) |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 56 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 57 | struct davinci_gpio_controller *d = chip2controller(chip); |
| 58 | struct davinci_gpio_regs __iomem *g = d->regs; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 59 | u32 temp; |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 60 | u32 mask = 1 << offset; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 61 | |
| 62 | spin_lock(&gpio_lock); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 63 | temp = __raw_readl(&g->dir); |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 64 | if (out) { |
| 65 | temp &= ~mask; |
| 66 | __raw_writel(mask, value ? &g->set_data : &g->clr_data); |
| 67 | } else { |
| 68 | temp |= mask; |
| 69 | } |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 70 | __raw_writel(temp, &g->dir); |
| 71 | spin_unlock(&gpio_lock); |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 72 | |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 73 | return 0; |
| 74 | } |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 75 | |
Cyril Chemparathy | ba4a984 | 2010-05-01 18:37:51 -0400 | [diff] [blame] | 76 | static int davinci_direction_in(struct gpio_chip *chip, unsigned offset) |
| 77 | { |
| 78 | return __davinci_direction(chip, offset, false, 0); |
| 79 | } |
| 80 | |
| 81 | static int |
| 82 | davinci_direction_out(struct gpio_chip *chip, unsigned offset, int value) |
| 83 | { |
| 84 | return __davinci_direction(chip, offset, true, value); |
| 85 | } |
| 86 | |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 87 | /* |
| 88 | * Read the pin's value (works even if it's set up as output); |
| 89 | * returns zero/nonzero. |
| 90 | * |
| 91 | * Note that changes are synched to the GPIO clock, so reading values back |
| 92 | * right after you've set them may give old values. |
| 93 | */ |
| 94 | static int davinci_gpio_get(struct gpio_chip *chip, unsigned offset) |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 95 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 96 | struct davinci_gpio_controller *d = chip2controller(chip); |
| 97 | struct davinci_gpio_regs __iomem *g = d->regs; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 98 | |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 99 | return (1 << offset) & __raw_readl(&g->in_data); |
| 100 | } |
| 101 | |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 102 | /* |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 103 | * Assuming the pin is muxed as a gpio output, set its output value. |
| 104 | */ |
| 105 | static void |
| 106 | davinci_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 107 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 108 | struct davinci_gpio_controller *d = chip2controller(chip); |
| 109 | struct davinci_gpio_regs __iomem *g = d->regs; |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 110 | |
| 111 | __raw_writel((1 << offset), value ? &g->set_data : &g->clr_data); |
| 112 | } |
| 113 | |
| 114 | static int __init davinci_gpio_setup(void) |
| 115 | { |
| 116 | int i, base; |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 117 | unsigned ngpio; |
| 118 | struct davinci_soc_info *soc_info = &davinci_soc_info; |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 119 | |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 120 | /* |
| 121 | * The gpio banks conceptually expose a segmented bitmap, |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 122 | * and "ngpio" is one more than the largest zero-based |
| 123 | * bit index that's valid. |
| 124 | */ |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 125 | ngpio = soc_info->gpio_num; |
| 126 | if (ngpio == 0) { |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 127 | pr_err("GPIO setup: how many GPIOs?\n"); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | |
| 131 | if (WARN_ON(DAVINCI_N_GPIO < ngpio)) |
| 132 | ngpio = DAVINCI_N_GPIO; |
| 133 | |
| 134 | for (i = 0, base = 0; base < ngpio; i++, base += 32) { |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 135 | chips[i].chip.label = "DaVinci"; |
| 136 | |
| 137 | chips[i].chip.direction_input = davinci_direction_in; |
| 138 | chips[i].chip.get = davinci_gpio_get; |
| 139 | chips[i].chip.direction_output = davinci_direction_out; |
| 140 | chips[i].chip.set = davinci_gpio_set; |
| 141 | |
| 142 | chips[i].chip.base = base; |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 143 | chips[i].chip.ngpio = ngpio - base; |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 144 | if (chips[i].chip.ngpio > 32) |
| 145 | chips[i].chip.ngpio = 32; |
| 146 | |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 147 | chips[i].regs = gpio2regs(base); |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 148 | |
| 149 | gpiochip_add(&chips[i].chip); |
| 150 | } |
| 151 | |
Kevin Hilman | dc75602 | 2009-05-11 11:04:53 -0700 | [diff] [blame] | 152 | davinci_gpio_irq_setup(); |
David Brownell | dce1115 | 2008-09-07 23:41:04 -0700 | [diff] [blame] | 153 | return 0; |
| 154 | } |
| 155 | pure_initcall(davinci_gpio_setup); |
| 156 | |
| 157 | /*--------------------------------------------------------------------------*/ |
| 158 | /* |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 159 | * We expect irqs will normally be set up as input pins, but they can also be |
| 160 | * used as output pins ... which is convenient for testing. |
| 161 | * |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 162 | * NOTE: The first few GPIOs also have direct INTC hookups in addition |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 163 | * to their GPIOBNK0 irq, with a bit less overhead. |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 164 | * |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 165 | * All those INTC hookups (direct, plus several IRQ banks) can also |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 166 | * serve as EDMA event triggers. |
| 167 | */ |
| 168 | |
| 169 | static void gpio_irq_disable(unsigned irq) |
| 170 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 171 | struct davinci_gpio_regs __iomem *g = irq2regs(irq); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 172 | u32 mask = (u32) get_irq_data(irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 173 | |
| 174 | __raw_writel(mask, &g->clr_falling); |
| 175 | __raw_writel(mask, &g->clr_rising); |
| 176 | } |
| 177 | |
| 178 | static void gpio_irq_enable(unsigned irq) |
| 179 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 180 | struct davinci_gpio_regs __iomem *g = irq2regs(irq); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 181 | u32 mask = (u32) get_irq_data(irq); |
David Brownell | df4aab4 | 2009-05-04 13:14:27 -0700 | [diff] [blame] | 182 | unsigned status = irq_desc[irq].status; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 183 | |
David Brownell | df4aab4 | 2009-05-04 13:14:27 -0700 | [diff] [blame] | 184 | status &= IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; |
| 185 | if (!status) |
| 186 | status = IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING; |
| 187 | |
| 188 | if (status & IRQ_TYPE_EDGE_FALLING) |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 189 | __raw_writel(mask, &g->set_falling); |
David Brownell | df4aab4 | 2009-05-04 13:14:27 -0700 | [diff] [blame] | 190 | if (status & IRQ_TYPE_EDGE_RISING) |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 191 | __raw_writel(mask, &g->set_rising); |
| 192 | } |
| 193 | |
| 194 | static int gpio_irq_type(unsigned irq, unsigned trigger) |
| 195 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 196 | struct davinci_gpio_regs __iomem *g = irq2regs(irq); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 197 | u32 mask = (u32) get_irq_data(irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 198 | |
| 199 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
| 200 | return -EINVAL; |
| 201 | |
| 202 | irq_desc[irq].status &= ~IRQ_TYPE_SENSE_MASK; |
| 203 | irq_desc[irq].status |= trigger; |
| 204 | |
David Brownell | df4aab4 | 2009-05-04 13:14:27 -0700 | [diff] [blame] | 205 | /* don't enable the IRQ if it's currently disabled */ |
| 206 | if (irq_desc[irq].depth == 0) { |
| 207 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING) |
| 208 | ? &g->set_falling : &g->clr_falling); |
| 209 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING) |
| 210 | ? &g->set_rising : &g->clr_rising); |
| 211 | } |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static struct irq_chip gpio_irqchip = { |
| 216 | .name = "GPIO", |
| 217 | .enable = gpio_irq_enable, |
| 218 | .disable = gpio_irq_disable, |
| 219 | .set_type = gpio_irq_type, |
| 220 | }; |
| 221 | |
| 222 | static void |
| 223 | gpio_irq_handler(unsigned irq, struct irq_desc *desc) |
| 224 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 225 | struct davinci_gpio_regs __iomem *g = irq2regs(irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 226 | u32 mask = 0xffff; |
| 227 | |
| 228 | /* we only care about one bank */ |
| 229 | if (irq & 1) |
| 230 | mask <<= 16; |
| 231 | |
| 232 | /* temporarily mask (level sensitive) parent IRQ */ |
Kevin Hilman | dc75602 | 2009-05-11 11:04:53 -0700 | [diff] [blame] | 233 | desc->chip->mask(irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 234 | desc->chip->ack(irq); |
| 235 | while (1) { |
| 236 | u32 status; |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 237 | int n; |
| 238 | int res; |
| 239 | |
| 240 | /* ack any irqs */ |
| 241 | status = __raw_readl(&g->intstat) & mask; |
| 242 | if (!status) |
| 243 | break; |
| 244 | __raw_writel(status, &g->intstat); |
| 245 | if (irq & 1) |
| 246 | status >>= 16; |
| 247 | |
| 248 | /* now demux them to the right lowlevel handler */ |
| 249 | n = (int)get_irq_data(irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 250 | while (status) { |
| 251 | res = ffs(status); |
| 252 | n += res; |
Dmitry Baryshkov | d8aa025 | 2008-10-09 13:36:24 +0100 | [diff] [blame] | 253 | generic_handle_irq(n - 1); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 254 | status >>= res; |
| 255 | } |
| 256 | } |
| 257 | desc->chip->unmask(irq); |
| 258 | /* now it may re-trigger */ |
| 259 | } |
| 260 | |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 261 | static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset) |
| 262 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 263 | struct davinci_gpio_controller *d = chip2controller(chip); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 264 | |
| 265 | if (d->irq_base >= 0) |
| 266 | return d->irq_base + offset; |
| 267 | else |
| 268 | return -ENODEV; |
| 269 | } |
| 270 | |
| 271 | static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset) |
| 272 | { |
| 273 | struct davinci_soc_info *soc_info = &davinci_soc_info; |
| 274 | |
| 275 | /* NOTE: we assume for now that only irqs in the first gpio_chip |
| 276 | * can provide direct-mapped IRQs to AINTC (up to 32 GPIOs). |
| 277 | */ |
| 278 | if (offset < soc_info->gpio_unbanked) |
| 279 | return soc_info->gpio_irq + offset; |
| 280 | else |
| 281 | return -ENODEV; |
| 282 | } |
| 283 | |
| 284 | static int gpio_irq_type_unbanked(unsigned irq, unsigned trigger) |
| 285 | { |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 286 | struct davinci_gpio_regs __iomem *g = irq2regs(irq); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 287 | u32 mask = (u32) get_irq_data(irq); |
| 288 | |
| 289 | if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) |
| 290 | return -EINVAL; |
| 291 | |
| 292 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_FALLING) |
| 293 | ? &g->set_falling : &g->clr_falling); |
| 294 | __raw_writel(mask, (trigger & IRQ_TYPE_EDGE_RISING) |
| 295 | ? &g->set_rising : &g->clr_rising); |
| 296 | |
| 297 | return 0; |
| 298 | } |
| 299 | |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 300 | /* |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 301 | * NOTE: for suspend/resume, probably best to make a platform_device with |
| 302 | * suspend_late/resume_resume calls hooking into results of the set_wake() |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 303 | * calls ... so if no gpios are wakeup events the clock can be disabled, |
| 304 | * with outputs left at previously set levels, and so that VDD3P3V.IOPWDN0 |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 305 | * (dm6446) can be set appropriately for GPIOV33 pins. |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 306 | */ |
| 307 | |
| 308 | static int __init davinci_gpio_irq_setup(void) |
| 309 | { |
| 310 | unsigned gpio, irq, bank; |
| 311 | struct clk *clk; |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 312 | u32 binten = 0; |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 313 | unsigned ngpio, bank_irq; |
| 314 | struct davinci_soc_info *soc_info = &davinci_soc_info; |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 315 | struct davinci_gpio_regs __iomem *g; |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 316 | |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 317 | ngpio = soc_info->gpio_num; |
| 318 | |
| 319 | bank_irq = soc_info->gpio_irq; |
| 320 | if (bank_irq == 0) { |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 321 | printk(KERN_ERR "Don't know first GPIO bank IRQ.\n"); |
| 322 | return -EINVAL; |
| 323 | } |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 324 | |
| 325 | clk = clk_get(NULL, "gpio"); |
| 326 | if (IS_ERR(clk)) { |
| 327 | printk(KERN_ERR "Error %ld getting gpio clock?\n", |
| 328 | PTR_ERR(clk)); |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 329 | return PTR_ERR(clk); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 330 | } |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 331 | clk_enable(clk); |
| 332 | |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 333 | /* Arrange gpio_to_irq() support, handling either direct IRQs or |
| 334 | * banked IRQs. Having GPIOs in the first GPIO bank use direct |
| 335 | * IRQs, while the others use banked IRQs, would need some setup |
| 336 | * tweaks to recognize hardware which can do that. |
| 337 | */ |
| 338 | for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) { |
| 339 | chips[bank].chip.to_irq = gpio_to_irq_banked; |
| 340 | chips[bank].irq_base = soc_info->gpio_unbanked |
| 341 | ? -EINVAL |
| 342 | : (soc_info->intc_irq_num + gpio); |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * AINTC can handle direct/unbanked IRQs for GPIOs, with the GPIO |
| 347 | * controller only handling trigger modes. We currently assume no |
| 348 | * IRQ mux conflicts; gpio_irq_type_unbanked() is only for GPIOs. |
| 349 | */ |
| 350 | if (soc_info->gpio_unbanked) { |
| 351 | static struct irq_chip gpio_irqchip_unbanked; |
| 352 | |
| 353 | /* pass "bank 0" GPIO IRQs to AINTC */ |
| 354 | chips[0].chip.to_irq = gpio_to_irq_unbanked; |
| 355 | binten = BIT(0); |
| 356 | |
| 357 | /* AINTC handles mask/unmask; GPIO handles triggering */ |
| 358 | irq = bank_irq; |
| 359 | gpio_irqchip_unbanked = *get_irq_desc_chip(irq_to_desc(irq)); |
| 360 | gpio_irqchip_unbanked.name = "GPIO-AINTC"; |
| 361 | gpio_irqchip_unbanked.set_type = gpio_irq_type_unbanked; |
| 362 | |
| 363 | /* default trigger: both edges */ |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 364 | g = gpio2regs(0); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 365 | __raw_writel(~0, &g->set_falling); |
| 366 | __raw_writel(~0, &g->set_rising); |
| 367 | |
| 368 | /* set the direct IRQs up to use that irqchip */ |
| 369 | for (gpio = 0; gpio < soc_info->gpio_unbanked; gpio++, irq++) { |
| 370 | set_irq_chip(irq, &gpio_irqchip_unbanked); |
| 371 | set_irq_data(irq, (void *) __gpio_mask(gpio)); |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 372 | set_irq_chip_data(irq, (__force void *) g); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 373 | irq_desc[irq].status |= IRQ_TYPE_EDGE_BOTH; |
| 374 | } |
| 375 | |
| 376 | goto done; |
| 377 | } |
| 378 | |
| 379 | /* |
| 380 | * Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we |
| 381 | * then chain through our own handler. |
| 382 | */ |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 383 | for (gpio = 0, irq = gpio_to_irq(0), bank = 0; |
| 384 | gpio < ngpio; |
| 385 | bank++, bank_irq++) { |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 386 | unsigned i; |
| 387 | |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 388 | /* disabled by default, enabled only as needed */ |
Cyril Chemparathy | 99e9e52 | 2010-05-01 18:37:52 -0400 | [diff] [blame^] | 389 | g = gpio2regs(gpio); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 390 | __raw_writel(~0, &g->clr_falling); |
| 391 | __raw_writel(~0, &g->clr_rising); |
| 392 | |
| 393 | /* set up all irqs in this bank */ |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 394 | set_irq_chained_handler(bank_irq, gpio_irq_handler); |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 395 | set_irq_chip_data(bank_irq, (__force void *) g); |
| 396 | set_irq_data(bank_irq, (void *) irq); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 397 | |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 398 | for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) { |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 399 | set_irq_chip(irq, &gpio_irqchip); |
Kevin Hilman | 21ce873 | 2010-02-25 16:49:56 -0800 | [diff] [blame] | 400 | set_irq_chip_data(irq, (__force void *) g); |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 401 | set_irq_data(irq, (void *) __gpio_mask(gpio)); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 402 | set_irq_handler(irq, handle_simple_irq); |
| 403 | set_irq_flags(irq, IRQF_VALID); |
| 404 | } |
David Brownell | 474dad5 | 2008-12-07 11:46:23 -0800 | [diff] [blame] | 405 | |
| 406 | binten |= BIT(bank); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 407 | } |
| 408 | |
David Brownell | 7a36071 | 2009-06-25 17:01:31 -0700 | [diff] [blame] | 409 | done: |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 410 | /* BINTEN -- per-bank interrupt enable. genirq would also let these |
| 411 | * bits be set/cleared dynamically. |
| 412 | */ |
Mark A. Greer | a994955 | 2009-04-15 12:40:35 -0700 | [diff] [blame] | 413 | __raw_writel(binten, soc_info->gpio_base + 0x08); |
Vladimir Barinov | 3d9edf0 | 2007-07-10 13:03:43 +0100 | [diff] [blame] | 414 | |
| 415 | printk(KERN_INFO "DaVinci: %d gpio irqs\n", irq - gpio_to_irq(0)); |
| 416 | |
| 417 | return 0; |
| 418 | } |