Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 1 | /* |
Grant Likely | c103de2 | 2011-06-04 18:38:28 -0600 | [diff] [blame] | 2 | * Generic driver for memory-mapped GPIO controllers. |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright 2008 MontaVista Software, Inc. |
| 5 | * Copyright 2008,2010 Anton Vorontsov <cbouatmailru@gmail.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | * ....``.```~~~~````.`.`.`.`.```````'',,,.........`````......`....... |
| 13 | * ...`` ```````.. |
| 14 | * ..The simplest form of a GPIO controller that the driver supports is`` |
| 15 | * `.just a single "data" register, where GPIO state can be read and/or ` |
| 16 | * `,..written. ,,..``~~~~ .....``.`.`.~~.```.`.........``````.``````` |
| 17 | * ````````` |
| 18 | ___ |
| 19 | _/~~|___/~| . ```~~~~~~ ___/___\___ ,~.`.`.`.`````.~~...,,,,... |
| 20 | __________|~$@~~~ %~ /o*o*o*o*o*o\ .. Implementing such a GPIO . |
| 21 | o ` ~~~~\___/~~~~ ` controller in FPGA is ,.` |
| 22 | `....trivial..'~`.```.``` |
| 23 | * ``````` |
| 24 | * .```````~~~~`..`.``.``. |
| 25 | * . The driver supports `... ,..```.`~~~```````````````....````.``,, |
| 26 | * . big-endian notation, just`. .. A bit more sophisticated controllers , |
| 27 | * . register the device with -be`. .with a pair of set/clear-bit registers , |
| 28 | * `.. suffix. ```~~`````....`.` . affecting the data register and the .` |
| 29 | * ``.`.``...``` ```.. output pins are also supported.` |
| 30 | * ^^ `````.`````````.,``~``~``~~`````` |
| 31 | * . ^^ |
| 32 | * ,..`.`.`...````````````......`.`.`.`.`.`..`.`.`.. |
| 33 | * .. The expectation is that in at least some cases . ,-~~~-, |
| 34 | * .this will be used with roll-your-own ASIC/FPGA .` \ / |
| 35 | * .logic in Verilog or VHDL. ~~~`````````..`````~~` \ / |
| 36 | * ..````````......``````````` \o_ |
| 37 | * | |
| 38 | * ^^ / \ |
| 39 | * |
| 40 | * ...`````~~`.....``.`..........``````.`.``.```........``. |
| 41 | * ` 8, 16, 32 and 64 bits registers are supported, and``. |
| 42 | * . the number of GPIOs is determined by the width of ~ |
| 43 | * .. the registers. ,............```.`.`..`.`.~~~.`.`.`~ |
| 44 | * `.......````.``` |
| 45 | */ |
| 46 | |
| 47 | #include <linux/init.h> |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 48 | #include <linux/err.h> |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 49 | #include <linux/bug.h> |
| 50 | #include <linux/kernel.h> |
| 51 | #include <linux/module.h> |
| 52 | #include <linux/spinlock.h> |
| 53 | #include <linux/compiler.h> |
| 54 | #include <linux/types.h> |
| 55 | #include <linux/errno.h> |
| 56 | #include <linux/log2.h> |
| 57 | #include <linux/ioport.h> |
| 58 | #include <linux/io.h> |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 59 | #include <linux/gpio/driver.h> |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 60 | #include <linux/slab.h> |
Linus Walleij | 4b63739 | 2016-01-05 11:13:28 +0100 | [diff] [blame] | 61 | #include <linux/bitops.h> |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 62 | #include <linux/platform_device.h> |
| 63 | #include <linux/mod_devicetable.h> |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 64 | #include <linux/of.h> |
| 65 | #include <linux/of_device.h> |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 66 | |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 67 | static void bgpio_write8(void __iomem *reg, unsigned long data) |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 68 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 69 | writeb(data, reg); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 70 | } |
| 71 | |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 72 | static unsigned long bgpio_read8(void __iomem *reg) |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 73 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 74 | return readb(reg); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 75 | } |
| 76 | |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 77 | static void bgpio_write16(void __iomem *reg, unsigned long data) |
| 78 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 79 | writew(data, reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | static unsigned long bgpio_read16(void __iomem *reg) |
| 83 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 84 | return readw(reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static void bgpio_write32(void __iomem *reg, unsigned long data) |
| 88 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 89 | writel(data, reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | static unsigned long bgpio_read32(void __iomem *reg) |
| 93 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 94 | return readl(reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | #if BITS_PER_LONG >= 64 |
| 98 | static void bgpio_write64(void __iomem *reg, unsigned long data) |
| 99 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 100 | writeq(data, reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | static unsigned long bgpio_read64(void __iomem *reg) |
| 104 | { |
Jamie Iles | fd99623 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 105 | return readq(reg); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 106 | } |
| 107 | #endif /* BITS_PER_LONG >= 64 */ |
| 108 | |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 109 | static void bgpio_write16be(void __iomem *reg, unsigned long data) |
| 110 | { |
| 111 | iowrite16be(data, reg); |
| 112 | } |
| 113 | |
| 114 | static unsigned long bgpio_read16be(void __iomem *reg) |
| 115 | { |
| 116 | return ioread16be(reg); |
| 117 | } |
| 118 | |
| 119 | static void bgpio_write32be(void __iomem *reg, unsigned long data) |
| 120 | { |
| 121 | iowrite32be(data, reg); |
| 122 | } |
| 123 | |
| 124 | static unsigned long bgpio_read32be(void __iomem *reg) |
| 125 | { |
| 126 | return ioread32be(reg); |
| 127 | } |
| 128 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 129 | static unsigned long bgpio_pin2mask(struct gpio_chip *gc, unsigned int pin) |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 130 | { |
Linus Walleij | 4b63739 | 2016-01-05 11:13:28 +0100 | [diff] [blame] | 131 | return BIT(pin); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 132 | } |
| 133 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 134 | static unsigned long bgpio_pin2mask_be(struct gpio_chip *gc, |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 135 | unsigned int pin) |
| 136 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 137 | return BIT(gc->bgpio_bits - 1 - pin); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 138 | } |
| 139 | |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 140 | static int bgpio_get_set(struct gpio_chip *gc, unsigned int gpio) |
| 141 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 142 | unsigned long pinmask = gc->pin2mask(gc, gpio); |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 143 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 144 | if (gc->bgpio_dir & pinmask) |
| 145 | return !!(gc->read_reg(gc->reg_set) & pinmask); |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 146 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 147 | return !!(gc->read_reg(gc->reg_dat) & pinmask); |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 148 | } |
| 149 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 150 | static int bgpio_get(struct gpio_chip *gc, unsigned int gpio) |
| 151 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 152 | return !!(gc->read_reg(gc->reg_dat) & gc->pin2mask(gc, gpio)); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 153 | } |
| 154 | |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 155 | static void bgpio_set_none(struct gpio_chip *gc, unsigned int gpio, int val) |
| 156 | { |
| 157 | } |
| 158 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 159 | static void bgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 160 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 161 | unsigned long mask = gc->pin2mask(gc, gpio); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 162 | unsigned long flags; |
| 163 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 164 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 165 | |
| 166 | if (val) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 167 | gc->bgpio_data |= mask; |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 168 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 169 | gc->bgpio_data &= ~mask; |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 170 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 171 | gc->write_reg(gc->reg_dat, gc->bgpio_data); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 172 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 173 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 176 | static void bgpio_set_with_clear(struct gpio_chip *gc, unsigned int gpio, |
| 177 | int val) |
| 178 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 179 | unsigned long mask = gc->pin2mask(gc, gpio); |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 180 | |
| 181 | if (val) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 182 | gc->write_reg(gc->reg_set, mask); |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 183 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 184 | gc->write_reg(gc->reg_clr, mask); |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 185 | } |
| 186 | |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 187 | static void bgpio_set_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 188 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 189 | unsigned long mask = gc->pin2mask(gc, gpio); |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 190 | unsigned long flags; |
| 191 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 192 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 193 | |
| 194 | if (val) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 195 | gc->bgpio_data |= mask; |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 196 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 197 | gc->bgpio_data &= ~mask; |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 198 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 199 | gc->write_reg(gc->reg_set, gc->bgpio_data); |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 200 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 201 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 202 | } |
| 203 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 204 | static void bgpio_multiple_get_masks(struct gpio_chip *gc, |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 205 | unsigned long *mask, unsigned long *bits, |
| 206 | unsigned long *set_mask, |
| 207 | unsigned long *clear_mask) |
| 208 | { |
| 209 | int i; |
| 210 | |
| 211 | *set_mask = 0; |
| 212 | *clear_mask = 0; |
| 213 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 214 | for (i = 0; i < gc->bgpio_bits; i++) { |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 215 | if (*mask == 0) |
| 216 | break; |
| 217 | if (__test_and_clear_bit(i, mask)) { |
| 218 | if (test_bit(i, bits)) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 219 | *set_mask |= gc->pin2mask(gc, i); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 220 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 221 | *clear_mask |= gc->pin2mask(gc, i); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 222 | } |
| 223 | } |
| 224 | } |
| 225 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 226 | static void bgpio_set_multiple_single_reg(struct gpio_chip *gc, |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 227 | unsigned long *mask, |
| 228 | unsigned long *bits, |
| 229 | void __iomem *reg) |
| 230 | { |
| 231 | unsigned long flags; |
| 232 | unsigned long set_mask, clear_mask; |
| 233 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 234 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 235 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 236 | bgpio_multiple_get_masks(gc, mask, bits, &set_mask, &clear_mask); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 237 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 238 | gc->bgpio_data |= set_mask; |
| 239 | gc->bgpio_data &= ~clear_mask; |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 240 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 241 | gc->write_reg(reg, gc->bgpio_data); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 242 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 243 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 244 | } |
| 245 | |
| 246 | static void bgpio_set_multiple(struct gpio_chip *gc, unsigned long *mask, |
| 247 | unsigned long *bits) |
| 248 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 249 | bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_dat); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static void bgpio_set_multiple_set(struct gpio_chip *gc, unsigned long *mask, |
| 253 | unsigned long *bits) |
| 254 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 255 | bgpio_set_multiple_single_reg(gc, mask, bits, gc->reg_set); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | static void bgpio_set_multiple_with_clear(struct gpio_chip *gc, |
| 259 | unsigned long *mask, |
| 260 | unsigned long *bits) |
| 261 | { |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 262 | unsigned long set_mask, clear_mask; |
| 263 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 264 | bgpio_multiple_get_masks(gc, mask, bits, &set_mask, &clear_mask); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 265 | |
| 266 | if (set_mask) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 267 | gc->write_reg(gc->reg_set, set_mask); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 268 | if (clear_mask) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 269 | gc->write_reg(gc->reg_clr, clear_mask); |
Rojhalat Ibrahim | 73c4ced | 2015-01-14 15:46:38 +0100 | [diff] [blame] | 270 | } |
| 271 | |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 272 | static int bgpio_simple_dir_in(struct gpio_chip *gc, unsigned int gpio) |
| 273 | { |
| 274 | return 0; |
| 275 | } |
| 276 | |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 277 | static int bgpio_dir_out_err(struct gpio_chip *gc, unsigned int gpio, |
| 278 | int val) |
| 279 | { |
| 280 | return -EINVAL; |
| 281 | } |
| 282 | |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 283 | static int bgpio_simple_dir_out(struct gpio_chip *gc, unsigned int gpio, |
| 284 | int val) |
| 285 | { |
| 286 | gc->set(gc, gpio, val); |
| 287 | |
| 288 | return 0; |
| 289 | } |
| 290 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 291 | static int bgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
| 292 | { |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 293 | unsigned long flags; |
| 294 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 295 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 296 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 297 | gc->bgpio_dir &= ~gc->pin2mask(gc, gpio); |
| 298 | gc->write_reg(gc->reg_dir, gc->bgpio_dir); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 299 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 300 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 301 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 302 | return 0; |
| 303 | } |
| 304 | |
Philipp Zabel | db3b0fc | 2015-06-12 18:20:35 +0200 | [diff] [blame] | 305 | static int bgpio_get_dir(struct gpio_chip *gc, unsigned int gpio) |
| 306 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 307 | /* Return 0 if output, 1 of input */ |
| 308 | return !(gc->read_reg(gc->reg_dir) & gc->pin2mask(gc, gpio)); |
Philipp Zabel | db3b0fc | 2015-06-12 18:20:35 +0200 | [diff] [blame] | 309 | } |
| 310 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 311 | static int bgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
| 312 | { |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 313 | unsigned long flags; |
| 314 | |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 315 | gc->set(gc, gpio, val); |
| 316 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 317 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 318 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 319 | gc->bgpio_dir |= gc->pin2mask(gc, gpio); |
| 320 | gc->write_reg(gc->reg_dir, gc->bgpio_dir); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 321 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 322 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 323 | |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | static int bgpio_dir_in_inv(struct gpio_chip *gc, unsigned int gpio) |
| 328 | { |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 329 | unsigned long flags; |
| 330 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 331 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 332 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 333 | gc->bgpio_dir |= gc->pin2mask(gc, gpio); |
| 334 | gc->write_reg(gc->reg_dir, gc->bgpio_dir); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 335 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 336 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 337 | |
| 338 | return 0; |
| 339 | } |
| 340 | |
| 341 | static int bgpio_dir_out_inv(struct gpio_chip *gc, unsigned int gpio, int val) |
| 342 | { |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 343 | unsigned long flags; |
| 344 | |
| 345 | gc->set(gc, gpio, val); |
| 346 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 347 | spin_lock_irqsave(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 348 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 349 | gc->bgpio_dir &= ~gc->pin2mask(gc, gpio); |
| 350 | gc->write_reg(gc->reg_dir, gc->bgpio_dir); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 351 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 352 | spin_unlock_irqrestore(&gc->bgpio_lock, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 353 | |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 354 | return 0; |
| 355 | } |
| 356 | |
Philipp Zabel | db3b0fc | 2015-06-12 18:20:35 +0200 | [diff] [blame] | 357 | static int bgpio_get_dir_inv(struct gpio_chip *gc, unsigned int gpio) |
| 358 | { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 359 | /* Return 0 if output, 1 if input */ |
| 360 | return !!(gc->read_reg(gc->reg_dir) & gc->pin2mask(gc, gpio)); |
Philipp Zabel | db3b0fc | 2015-06-12 18:20:35 +0200 | [diff] [blame] | 361 | } |
| 362 | |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 363 | static int bgpio_setup_accessors(struct device *dev, |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 364 | struct gpio_chip *gc, |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 365 | bool bit_be, |
| 366 | bool byte_be) |
Jamie Iles | 364b5e8 | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 367 | { |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 368 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 369 | switch (gc->bgpio_bits) { |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 370 | case 8: |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 371 | gc->read_reg = bgpio_read8; |
| 372 | gc->write_reg = bgpio_write8; |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 373 | break; |
| 374 | case 16: |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 375 | if (byte_be) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 376 | gc->read_reg = bgpio_read16be; |
| 377 | gc->write_reg = bgpio_write16be; |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 378 | } else { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 379 | gc->read_reg = bgpio_read16; |
| 380 | gc->write_reg = bgpio_write16; |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 381 | } |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 382 | break; |
| 383 | case 32: |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 384 | if (byte_be) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 385 | gc->read_reg = bgpio_read32be; |
| 386 | gc->write_reg = bgpio_write32be; |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 387 | } else { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 388 | gc->read_reg = bgpio_read32; |
| 389 | gc->write_reg = bgpio_write32; |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 390 | } |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 391 | break; |
| 392 | #if BITS_PER_LONG >= 64 |
| 393 | case 64: |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 394 | if (byte_be) { |
| 395 | dev_err(dev, |
| 396 | "64 bit big endian byte order unsupported\n"); |
| 397 | return -EINVAL; |
| 398 | } else { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 399 | gc->read_reg = bgpio_read64; |
| 400 | gc->write_reg = bgpio_write64; |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 401 | } |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 402 | break; |
| 403 | #endif /* BITS_PER_LONG >= 64 */ |
| 404 | default: |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 405 | dev_err(dev, "unsupported data width %u bits\n", gc->bgpio_bits); |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 406 | return -EINVAL; |
| 407 | } |
| 408 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 409 | gc->pin2mask = bit_be ? bgpio_pin2mask_be : bgpio_pin2mask; |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 410 | |
| 411 | return 0; |
| 412 | } |
| 413 | |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 414 | /* |
| 415 | * Create the device and allocate the resources. For setting GPIO's there are |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 416 | * three supported configurations: |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 417 | * |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 418 | * - single input/output register resource (named "dat"). |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 419 | * - set/clear pair (named "set" and "clr"). |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 420 | * - single output register resource and single input resource ("set" and |
| 421 | * dat"). |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 422 | * |
| 423 | * For the single output register, this drives a 1 by setting a bit and a zero |
| 424 | * by clearing a bit. For the set clr pair, this drives a 1 by setting a bit |
| 425 | * in the set register and clears it by setting a bit in the clear register. |
| 426 | * The configuration is detected by which resources are present. |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 427 | * |
| 428 | * For setting the GPIO direction, there are three supported configurations: |
| 429 | * |
| 430 | * - simple bidirection GPIO that requires no configuration. |
| 431 | * - an output direction register (named "dirout") where a 1 bit |
| 432 | * indicates the GPIO is an output. |
| 433 | * - an input direction register (named "dirin") where a 1 bit indicates |
| 434 | * the GPIO is an input. |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 435 | */ |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 436 | static int bgpio_setup_io(struct gpio_chip *gc, |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 437 | void __iomem *dat, |
| 438 | void __iomem *set, |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 439 | void __iomem *clr, |
| 440 | unsigned long flags) |
Jamie Iles | 8467afe | 2011-05-20 00:40:14 -0600 | [diff] [blame] | 441 | { |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 442 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 443 | gc->reg_dat = dat; |
| 444 | if (!gc->reg_dat) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 445 | return -EINVAL; |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 446 | |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 447 | if (set && clr) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 448 | gc->reg_set = set; |
| 449 | gc->reg_clr = clr; |
| 450 | gc->set = bgpio_set_with_clear; |
| 451 | gc->set_multiple = bgpio_set_multiple_with_clear; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 452 | } else if (set && !clr) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 453 | gc->reg_set = set; |
| 454 | gc->set = bgpio_set_set; |
| 455 | gc->set_multiple = bgpio_set_multiple_set; |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 456 | } else if (flags & BGPIOF_NO_OUTPUT) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 457 | gc->set = bgpio_set_none; |
| 458 | gc->set_multiple = NULL; |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 459 | } else { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 460 | gc->set = bgpio_set; |
| 461 | gc->set_multiple = bgpio_set_multiple; |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 464 | if (!(flags & BGPIOF_UNREADABLE_REG_SET) && |
| 465 | (flags & BGPIOF_READ_OUTPUT_REG_SET)) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 466 | gc->get = bgpio_get_set; |
Vladimir Zapolskiy | b19e7f5 | 2015-04-29 18:34:59 +0300 | [diff] [blame] | 467 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 468 | gc->get = bgpio_get; |
Jamie Iles | dd86a0c | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 469 | |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 470 | return 0; |
| 471 | } |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 472 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 473 | static int bgpio_setup_direction(struct gpio_chip *gc, |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 474 | void __iomem *dirout, |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 475 | void __iomem *dirin, |
| 476 | unsigned long flags) |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 477 | { |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 478 | if (dirout && dirin) { |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 479 | return -EINVAL; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 480 | } else if (dirout) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 481 | gc->reg_dir = dirout; |
| 482 | gc->direction_output = bgpio_dir_out; |
| 483 | gc->direction_input = bgpio_dir_in; |
| 484 | gc->get_direction = bgpio_get_dir; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 485 | } else if (dirin) { |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 486 | gc->reg_dir = dirin; |
| 487 | gc->direction_output = bgpio_dir_out_inv; |
| 488 | gc->direction_input = bgpio_dir_in_inv; |
| 489 | gc->get_direction = bgpio_get_dir_inv; |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 490 | } else { |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 491 | if (flags & BGPIOF_NO_OUTPUT) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 492 | gc->direction_output = bgpio_dir_out_err; |
Rabin Vincent | 91492a4 | 2015-07-22 15:05:18 +0200 | [diff] [blame] | 493 | else |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 494 | gc->direction_output = bgpio_simple_dir_out; |
| 495 | gc->direction_input = bgpio_simple_dir_in; |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 496 | } |
| 497 | |
| 498 | return 0; |
| 499 | } |
| 500 | |
Anthony Fee | 7b42e3d | 2014-05-19 18:49:14 +0100 | [diff] [blame] | 501 | static int bgpio_request(struct gpio_chip *chip, unsigned gpio_pin) |
| 502 | { |
| 503 | if (gpio_pin < chip->ngpio) |
| 504 | return 0; |
| 505 | |
| 506 | return -EINVAL; |
| 507 | } |
| 508 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 509 | int bgpio_init(struct gpio_chip *gc, struct device *dev, |
Russell King | 4f5b048 | 2011-09-14 16:22:29 -0700 | [diff] [blame] | 510 | unsigned long sz, void __iomem *dat, void __iomem *set, |
| 511 | void __iomem *clr, void __iomem *dirout, void __iomem *dirin, |
Shawn Guo | 3e11f7b | 2012-05-19 21:34:58 +0800 | [diff] [blame] | 512 | unsigned long flags) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 513 | { |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 514 | int ret; |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 515 | |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 516 | if (!is_power_of_2(sz)) |
| 517 | return -EINVAL; |
Jamie Iles | e027d6f | 2011-05-20 00:40:16 -0600 | [diff] [blame] | 518 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 519 | gc->bgpio_bits = sz * 8; |
| 520 | if (gc->bgpio_bits > BITS_PER_LONG) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 521 | return -EINVAL; |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 522 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 523 | spin_lock_init(&gc->bgpio_lock); |
| 524 | gc->parent = dev; |
| 525 | gc->label = dev_name(dev); |
| 526 | gc->base = -1; |
| 527 | gc->ngpio = gc->bgpio_bits; |
| 528 | gc->request = bgpio_request; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 529 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 530 | ret = bgpio_setup_io(gc, dat, set, clr, flags); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 531 | if (ret) |
| 532 | return ret; |
| 533 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 534 | ret = bgpio_setup_accessors(dev, gc, flags & BGPIOF_BIG_ENDIAN, |
Andreas Larsson | 2b78f1e | 2013-03-15 14:45:38 +0100 | [diff] [blame] | 535 | flags & BGPIOF_BIG_ENDIAN_BYTE_ORDER); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 536 | if (ret) |
| 537 | return ret; |
| 538 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 539 | ret = bgpio_setup_direction(gc, dirout, dirin, flags); |
Jamie Iles | 3102911 | 2011-05-20 00:40:17 -0600 | [diff] [blame] | 540 | if (ret) |
| 541 | return ret; |
| 542 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 543 | gc->bgpio_data = gc->read_reg(gc->reg_dat); |
| 544 | if (gc->set == bgpio_set_set && |
Shawn Guo | 3e11f7b | 2012-05-19 21:34:58 +0800 | [diff] [blame] | 545 | !(flags & BGPIOF_UNREADABLE_REG_SET)) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 546 | gc->bgpio_data = gc->read_reg(gc->reg_set); |
| 547 | if (gc->reg_dir && !(flags & BGPIOF_UNREADABLE_REG_DIR)) |
| 548 | gc->bgpio_dir = gc->read_reg(gc->reg_dir); |
Jamie Iles | 924e7a9 | 2011-05-20 00:40:15 -0600 | [diff] [blame] | 549 | |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 550 | return ret; |
| 551 | } |
| 552 | EXPORT_SYMBOL_GPL(bgpio_init); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 553 | |
Christian Lamparter | 8f01c9d | 2016-04-29 02:53:14 +0200 | [diff] [blame] | 554 | #if IS_ENABLED(CONFIG_GPIO_GENERIC_PLATFORM) |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 555 | |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 556 | static void __iomem *bgpio_map(struct platform_device *pdev, |
| 557 | const char *name, |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 558 | resource_size_t sane_sz) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 559 | { |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 560 | struct resource *r; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 561 | resource_size_t sz; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 562 | |
| 563 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, name); |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 564 | if (!r) |
Guenter Roeck | b2f68b6 | 2015-10-21 00:12:00 -0700 | [diff] [blame] | 565 | return NULL; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 566 | |
| 567 | sz = resource_size(r); |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 568 | if (sz != sane_sz) |
| 569 | return IOMEM_ERR_PTR(-EINVAL); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 570 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 571 | return devm_ioremap_resource(&pdev->dev, r); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 574 | #ifdef CONFIG_OF |
| 575 | static const struct of_device_id bgpio_of_match[] = { |
Christian Lamparter | c0d30ec | 2016-05-13 23:07:12 +0200 | [diff] [blame] | 576 | { .compatible = "wd,mbl-gpio" }, |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 577 | { } |
| 578 | }; |
| 579 | MODULE_DEVICE_TABLE(of, bgpio_of_match); |
| 580 | |
| 581 | static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev, |
| 582 | unsigned long *flags) |
| 583 | { |
| 584 | struct bgpio_pdata *pdata; |
| 585 | |
| 586 | if (!of_match_device(bgpio_of_match, &pdev->dev)) |
| 587 | return NULL; |
| 588 | |
| 589 | pdata = devm_kzalloc(&pdev->dev, sizeof(struct bgpio_pdata), |
| 590 | GFP_KERNEL); |
| 591 | if (!pdata) |
| 592 | return ERR_PTR(-ENOMEM); |
| 593 | |
| 594 | pdata->base = -1; |
| 595 | |
Christian Lamparter | c0d30ec | 2016-05-13 23:07:12 +0200 | [diff] [blame] | 596 | if (of_property_read_bool(pdev->dev.of_node, "no-output")) |
| 597 | *flags |= BGPIOF_NO_OUTPUT; |
| 598 | |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 599 | return pdata; |
| 600 | } |
| 601 | #else |
| 602 | static struct bgpio_pdata *bgpio_parse_dt(struct platform_device *pdev, |
| 603 | unsigned long *flags) |
| 604 | { |
| 605 | return NULL; |
| 606 | } |
| 607 | #endif /* CONFIG_OF */ |
| 608 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 609 | static int bgpio_pdev_probe(struct platform_device *pdev) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 610 | { |
| 611 | struct device *dev = &pdev->dev; |
| 612 | struct resource *r; |
| 613 | void __iomem *dat; |
| 614 | void __iomem *set; |
| 615 | void __iomem *clr; |
| 616 | void __iomem *dirout; |
| 617 | void __iomem *dirin; |
| 618 | unsigned long sz; |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 619 | unsigned long flags = 0; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 620 | int err; |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 621 | struct gpio_chip *gc; |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 622 | struct bgpio_pdata *pdata; |
| 623 | |
| 624 | pdata = bgpio_parse_dt(pdev, &flags); |
| 625 | if (IS_ERR(pdata)) |
| 626 | return PTR_ERR(pdata); |
| 627 | |
| 628 | if (!pdata) { |
| 629 | pdata = dev_get_platdata(dev); |
| 630 | flags = pdev->id_entry->driver_data; |
| 631 | } |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 632 | |
| 633 | r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat"); |
| 634 | if (!r) |
| 635 | return -EINVAL; |
| 636 | |
| 637 | sz = resource_size(r); |
| 638 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 639 | dat = bgpio_map(pdev, "dat", sz); |
| 640 | if (IS_ERR(dat)) |
| 641 | return PTR_ERR(dat); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 642 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 643 | set = bgpio_map(pdev, "set", sz); |
| 644 | if (IS_ERR(set)) |
| 645 | return PTR_ERR(set); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 646 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 647 | clr = bgpio_map(pdev, "clr", sz); |
| 648 | if (IS_ERR(clr)) |
| 649 | return PTR_ERR(clr); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 650 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 651 | dirout = bgpio_map(pdev, "dirout", sz); |
| 652 | if (IS_ERR(dirout)) |
| 653 | return PTR_ERR(dirout); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 654 | |
Heiner Kallweit | 8d24026 | 2015-09-30 23:52:36 +0200 | [diff] [blame] | 655 | dirin = bgpio_map(pdev, "dirin", sz); |
| 656 | if (IS_ERR(dirin)) |
| 657 | return PTR_ERR(dirin); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 658 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 659 | gc = devm_kzalloc(&pdev->dev, sizeof(*gc), GFP_KERNEL); |
| 660 | if (!gc) |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 661 | return -ENOMEM; |
| 662 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 663 | err = bgpio_init(gc, dev, sz, dat, set, clr, dirout, dirin, flags); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 664 | if (err) |
| 665 | return err; |
| 666 | |
| 667 | if (pdata) { |
Pawel Moll | 781f6d7 | 2014-01-30 13:18:57 +0000 | [diff] [blame] | 668 | if (pdata->label) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 669 | gc->label = pdata->label; |
| 670 | gc->base = pdata->base; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 671 | if (pdata->ngpio > 0) |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 672 | gc->ngpio = pdata->ngpio; |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 673 | } |
| 674 | |
Linus Walleij | 0f4630f | 2015-12-04 14:02:58 +0100 | [diff] [blame] | 675 | platform_set_drvdata(pdev, gc); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 676 | |
Laxman Dewangan | c05f813 | 2016-02-22 17:43:28 +0530 | [diff] [blame] | 677 | return devm_gpiochip_add_data(&pdev->dev, gc, NULL); |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | static const struct platform_device_id bgpio_id_table[] = { |
Alexander Shiyan | 1933853 | 2014-03-16 09:10:34 +0400 | [diff] [blame] | 681 | { |
| 682 | .name = "basic-mmio-gpio", |
| 683 | .driver_data = 0, |
| 684 | }, { |
| 685 | .name = "basic-mmio-gpio-be", |
| 686 | .driver_data = BGPIOF_BIG_ENDIAN, |
| 687 | }, |
| 688 | { } |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 689 | }; |
| 690 | MODULE_DEVICE_TABLE(platform, bgpio_id_table); |
| 691 | |
| 692 | static struct platform_driver bgpio_driver = { |
| 693 | .driver = { |
| 694 | .name = "basic-mmio-gpio", |
Álvaro Fernández Rojas | e698613 | 2016-05-13 23:07:11 +0200 | [diff] [blame] | 695 | .of_match_table = of_match_ptr(bgpio_of_match), |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 696 | }, |
| 697 | .id_table = bgpio_id_table, |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 698 | .probe = bgpio_pdev_probe, |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 699 | }; |
| 700 | |
Mark Brown | 6f61415 | 2011-12-08 00:24:00 +0800 | [diff] [blame] | 701 | module_platform_driver(bgpio_driver); |
Jamie Iles | 280df6b | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 702 | |
Grant Likely | c103de2 | 2011-06-04 18:38:28 -0600 | [diff] [blame] | 703 | #endif /* CONFIG_GPIO_GENERIC_PLATFORM */ |
Anton Vorontsov | aeec56e | 2010-10-27 15:33:15 -0700 | [diff] [blame] | 704 | |
| 705 | MODULE_DESCRIPTION("Driver for basic memory-mapped GPIO controllers"); |
| 706 | MODULE_AUTHOR("Anton Vorontsov <cbouatmailru@gmail.com>"); |
| 707 | MODULE_LICENSE("GPL"); |