John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 1 | /* |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 2 | * Xilinx gpio driver for xps/axi_gpio IP. |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 3 | * |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 4 | * Copyright 2008 - 2013 Xilinx, Inc. |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * You should have received a copy of the GNU General Public License |
| 11 | * along with this program; if not, write to the Free Software |
| 12 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 13 | */ |
| 14 | |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 15 | #include <linux/bitops.h> |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 16 | #include <linux/init.h> |
| 17 | #include <linux/errno.h> |
Paul Gortmaker | bb207ef | 2011-07-03 13:38:09 -0400 | [diff] [blame] | 18 | #include <linux/module.h> |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 19 | #include <linux/of_device.h> |
| 20 | #include <linux/of_platform.h> |
| 21 | #include <linux/of_gpio.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/gpio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 24 | #include <linux/slab.h> |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 25 | |
| 26 | /* Register Offset Definitions */ |
| 27 | #define XGPIO_DATA_OFFSET (0x0) /* Data register */ |
| 28 | #define XGPIO_TRI_OFFSET (0x4) /* I/O direction register */ |
| 29 | |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 30 | #define XGPIO_CHANNEL_OFFSET 0x8 |
| 31 | |
| 32 | /* Read/Write access to the GPIO registers */ |
Ricardo Ribalda Delgado | c54c58b | 2014-12-17 16:51:10 +0100 | [diff] [blame] | 33 | #if defined(CONFIG_ARCH_ZYNQ) || defined(CONFIG_X86) |
Michal Simek | cc090d6 | 2013-06-03 14:31:18 +0200 | [diff] [blame] | 34 | # define xgpio_readreg(offset) readl(offset) |
| 35 | # define xgpio_writereg(offset, val) writel(val, offset) |
| 36 | #else |
| 37 | # define xgpio_readreg(offset) __raw_readl(offset) |
| 38 | # define xgpio_writereg(offset, val) __raw_writel(val, offset) |
| 39 | #endif |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 40 | |
| 41 | /** |
| 42 | * struct xgpio_instance - Stores information about GPIO device |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 43 | * @mmchip: OF GPIO chip for memory mapped banks |
Michal Simek | 3c1b5c9b | 2015-05-04 16:37:16 +0200 | [diff] [blame] | 44 | * @gpio_width: GPIO width for every channel |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 45 | * @gpio_state: GPIO state shadow register |
| 46 | * @gpio_dir: GPIO direction shadow register |
| 47 | * @gpio_lock: Lock used for synchronization |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 48 | */ |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 49 | struct xgpio_instance { |
| 50 | struct of_mm_gpio_chip mmchip; |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 51 | unsigned int gpio_width[2]; |
| 52 | u32 gpio_state[2]; |
| 53 | u32 gpio_dir[2]; |
| 54 | spinlock_t gpio_lock[2]; |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 55 | }; |
| 56 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 57 | static inline int xgpio_index(struct xgpio_instance *chip, int gpio) |
| 58 | { |
| 59 | if (gpio >= chip->gpio_width[0]) |
| 60 | return 1; |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static inline int xgpio_regoffset(struct xgpio_instance *chip, int gpio) |
| 66 | { |
| 67 | if (xgpio_index(chip, gpio)) |
| 68 | return XGPIO_CHANNEL_OFFSET; |
| 69 | |
| 70 | return 0; |
| 71 | } |
| 72 | |
| 73 | static inline int xgpio_offset(struct xgpio_instance *chip, int gpio) |
| 74 | { |
| 75 | if (xgpio_index(chip, gpio)) |
| 76 | return gpio - chip->gpio_width[0]; |
| 77 | |
| 78 | return gpio; |
| 79 | } |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 80 | |
| 81 | /** |
| 82 | * xgpio_get - Read the specified signal of the GPIO device. |
| 83 | * @gc: Pointer to gpio_chip device structure. |
| 84 | * @gpio: GPIO signal number. |
| 85 | * |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 86 | * This function reads the specified signal of the GPIO device. |
| 87 | * |
| 88 | * Return: |
| 89 | * 0 if direction of GPIO signals is set as input otherwise it |
| 90 | * returns negative error value. |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 91 | */ |
| 92 | static int xgpio_get(struct gpio_chip *gc, unsigned int gpio) |
| 93 | { |
| 94 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 95 | struct xgpio_instance *chip = gpiochip_get_data(gc); |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 96 | u32 val; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 97 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 98 | val = xgpio_readreg(mm_gc->regs + XGPIO_DATA_OFFSET + |
| 99 | xgpio_regoffset(chip, gpio)); |
| 100 | |
| 101 | return !!(val & BIT(xgpio_offset(chip, gpio))); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | /** |
| 105 | * xgpio_set - Write the specified signal of the GPIO device. |
| 106 | * @gc: Pointer to gpio_chip device structure. |
| 107 | * @gpio: GPIO signal number. |
| 108 | * @val: Value to be written to specified signal. |
| 109 | * |
| 110 | * This function writes the specified value in to the specified signal of the |
| 111 | * GPIO device. |
| 112 | */ |
| 113 | static void xgpio_set(struct gpio_chip *gc, unsigned int gpio, int val) |
| 114 | { |
| 115 | unsigned long flags; |
| 116 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 117 | struct xgpio_instance *chip = gpiochip_get_data(gc); |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 118 | int index = xgpio_index(chip, gpio); |
| 119 | int offset = xgpio_offset(chip, gpio); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 120 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 121 | spin_lock_irqsave(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 122 | |
| 123 | /* Write to GPIO signal and set its direction to output */ |
| 124 | if (val) |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 125 | chip->gpio_state[index] |= BIT(offset); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 126 | else |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 127 | chip->gpio_state[index] &= ~BIT(offset); |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 128 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 129 | xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET + |
| 130 | xgpio_regoffset(chip, gpio), chip->gpio_state[index]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 131 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 132 | spin_unlock_irqrestore(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | /** |
| 136 | * xgpio_dir_in - Set the direction of the specified GPIO signal as input. |
| 137 | * @gc: Pointer to gpio_chip device structure. |
| 138 | * @gpio: GPIO signal number. |
| 139 | * |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 140 | * Return: |
| 141 | * 0 - if direction of GPIO signals is set as input |
| 142 | * otherwise it returns negative error value. |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 143 | */ |
| 144 | static int xgpio_dir_in(struct gpio_chip *gc, unsigned int gpio) |
| 145 | { |
| 146 | unsigned long flags; |
| 147 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 148 | struct xgpio_instance *chip = gpiochip_get_data(gc); |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 149 | int index = xgpio_index(chip, gpio); |
| 150 | int offset = xgpio_offset(chip, gpio); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 151 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 152 | spin_lock_irqsave(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 153 | |
| 154 | /* Set the GPIO bit in shadow register and set direction as input */ |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 155 | chip->gpio_dir[index] |= BIT(offset); |
| 156 | xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET + |
| 157 | xgpio_regoffset(chip, gpio), chip->gpio_dir[index]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 158 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 159 | spin_unlock_irqrestore(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * xgpio_dir_out - Set the direction of the specified GPIO signal as output. |
| 166 | * @gc: Pointer to gpio_chip device structure. |
| 167 | * @gpio: GPIO signal number. |
| 168 | * @val: Value to be written to specified signal. |
| 169 | * |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 170 | * This function sets the direction of specified GPIO signal as output. |
| 171 | * |
| 172 | * Return: |
| 173 | * If all GPIO signals of GPIO chip is configured as input then it returns |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 174 | * error otherwise it returns 0. |
| 175 | */ |
| 176 | static int xgpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) |
| 177 | { |
| 178 | unsigned long flags; |
| 179 | struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 180 | struct xgpio_instance *chip = gpiochip_get_data(gc); |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 181 | int index = xgpio_index(chip, gpio); |
| 182 | int offset = xgpio_offset(chip, gpio); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 183 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 184 | spin_lock_irqsave(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 185 | |
| 186 | /* Write state of GPIO signal */ |
| 187 | if (val) |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 188 | chip->gpio_state[index] |= BIT(offset); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 189 | else |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 190 | chip->gpio_state[index] &= ~BIT(offset); |
| 191 | xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET + |
| 192 | xgpio_regoffset(chip, gpio), chip->gpio_state[index]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 193 | |
| 194 | /* Clear the GPIO bit in shadow register and set direction as output */ |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 195 | chip->gpio_dir[index] &= ~BIT(offset); |
| 196 | xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET + |
| 197 | xgpio_regoffset(chip, gpio), chip->gpio_dir[index]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 198 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 199 | spin_unlock_irqrestore(&chip->gpio_lock[index], flags); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * xgpio_save_regs - Set initial values of GPIO pins |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 206 | * @mm_gc: Pointer to memory mapped GPIO chip structure |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 207 | */ |
| 208 | static void xgpio_save_regs(struct of_mm_gpio_chip *mm_gc) |
| 209 | { |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 210 | struct xgpio_instance *chip = gpiochip_get_data(&mm_gc->gc); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 211 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 212 | xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET, chip->gpio_state[0]); |
| 213 | xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET, chip->gpio_dir[0]); |
| 214 | |
| 215 | if (!chip->gpio_width[1]) |
| 216 | return; |
| 217 | |
Raphaël Teysseyre | 5b2c912 | 2015-06-24 09:19:45 +0200 | [diff] [blame] | 218 | xgpio_writereg(mm_gc->regs + XGPIO_DATA_OFFSET + XGPIO_CHANNEL_OFFSET, |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 219 | chip->gpio_state[1]); |
Raphaël Teysseyre | 5b2c912 | 2015-06-24 09:19:45 +0200 | [diff] [blame] | 220 | xgpio_writereg(mm_gc->regs + XGPIO_TRI_OFFSET + XGPIO_CHANNEL_OFFSET, |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 221 | chip->gpio_dir[1]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 222 | } |
| 223 | |
| 224 | /** |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 225 | * xgpio_remove - Remove method for the GPIO device. |
| 226 | * @pdev: pointer to the platform device |
| 227 | * |
| 228 | * This function remove gpiochips and frees all the allocated resources. |
Michal Simek | 3c1b5c9b | 2015-05-04 16:37:16 +0200 | [diff] [blame] | 229 | * |
| 230 | * Return: 0 always |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 231 | */ |
| 232 | static int xgpio_remove(struct platform_device *pdev) |
| 233 | { |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 234 | struct xgpio_instance *chip = platform_get_drvdata(pdev); |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 235 | |
Ricardo Ribalda Delgado | c458e45 | 2014-12-17 16:51:14 +0100 | [diff] [blame] | 236 | of_mm_gpiochip_remove(&chip->mmchip); |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | /** |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 242 | * xgpio_of_probe - Probe method for the GPIO device. |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 243 | * @pdev: pointer to the platform device |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 244 | * |
Ricardo Ribalda Delgado | 4ae798f | 2014-12-17 16:51:11 +0100 | [diff] [blame] | 245 | * Return: |
| 246 | * It returns 0, if the driver is bound to the GPIO device, or |
| 247 | * a negative value if there is an error. |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 248 | */ |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 249 | static int xgpio_probe(struct platform_device *pdev) |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 250 | { |
| 251 | struct xgpio_instance *chip; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 252 | int status = 0; |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 253 | struct device_node *np = pdev->dev.of_node; |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 254 | u32 is_dual; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 255 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 256 | chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); |
| 257 | if (!chip) |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 258 | return -ENOMEM; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 259 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 260 | platform_set_drvdata(pdev, chip); |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 261 | |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 262 | /* Update GPIO state shadow register with default value */ |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 263 | of_property_read_u32(np, "xlnx,dout-default", &chip->gpio_state[0]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 264 | |
| 265 | /* Update GPIO direction shadow register with default value */ |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 266 | if (of_property_read_u32(np, "xlnx,tri-default", &chip->gpio_dir[0])) |
| 267 | chip->gpio_dir[0] = 0xFFFFFFFF; |
Michal Simek | 6f8bf50 | 2013-06-03 14:31:16 +0200 | [diff] [blame] | 268 | |
Gernot Vormayr | 1b4c5a6 | 2014-09-24 00:58:45 +0200 | [diff] [blame] | 269 | /* |
| 270 | * Check device node and parent device node for device width |
| 271 | * and assume default width of 32 |
| 272 | */ |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 273 | if (of_property_read_u32(np, "xlnx,gpio-width", &chip->gpio_width[0])) |
| 274 | chip->gpio_width[0] = 32; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 275 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 276 | spin_lock_init(&chip->gpio_lock[0]); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 277 | |
Ricardo Ribalda Delgado | 1d6902d | 2014-12-17 16:51:12 +0100 | [diff] [blame] | 278 | if (of_property_read_u32(np, "xlnx,is-dual", &is_dual)) |
| 279 | is_dual = 0; |
| 280 | |
| 281 | if (is_dual) { |
| 282 | /* Update GPIO state shadow register with default value */ |
| 283 | of_property_read_u32(np, "xlnx,dout-default-2", |
| 284 | &chip->gpio_state[1]); |
| 285 | |
| 286 | /* Update GPIO direction shadow register with default value */ |
| 287 | if (of_property_read_u32(np, "xlnx,tri-default-2", |
| 288 | &chip->gpio_dir[1])) |
| 289 | chip->gpio_dir[1] = 0xFFFFFFFF; |
| 290 | |
| 291 | /* |
| 292 | * Check device node and parent device node for device width |
| 293 | * and assume default width of 32 |
| 294 | */ |
| 295 | if (of_property_read_u32(np, "xlnx,gpio2-width", |
| 296 | &chip->gpio_width[1])) |
| 297 | chip->gpio_width[1] = 32; |
| 298 | |
| 299 | spin_lock_init(&chip->gpio_lock[1]); |
| 300 | } |
| 301 | |
| 302 | chip->mmchip.gc.ngpio = chip->gpio_width[0] + chip->gpio_width[1]; |
Linus Walleij | 58383c7 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 303 | chip->mmchip.gc.parent = &pdev->dev; |
Anton Vorontsov | a19e3da | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 304 | chip->mmchip.gc.direction_input = xgpio_dir_in; |
| 305 | chip->mmchip.gc.direction_output = xgpio_dir_out; |
| 306 | chip->mmchip.gc.get = xgpio_get; |
| 307 | chip->mmchip.gc.set = xgpio_set; |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 308 | |
| 309 | chip->mmchip.save_regs = xgpio_save_regs; |
| 310 | |
| 311 | /* Call the OF gpio helper to setup and register the GPIO device */ |
Linus Walleij | 097d88e | 2015-12-07 15:20:17 +0100 | [diff] [blame^] | 312 | status = of_mm_gpiochip_add_data(np, &chip->mmchip, chip); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 313 | if (status) { |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 314 | pr_err("%s: error in probe function with status %d\n", |
| 315 | np->full_name, status); |
| 316 | return status; |
| 317 | } |
Michal Simek | 74600ee | 2013-06-03 14:31:17 +0200 | [diff] [blame] | 318 | |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 319 | return 0; |
| 320 | } |
| 321 | |
Jingoo Han | 9992bc9 | 2014-05-07 18:08:20 +0900 | [diff] [blame] | 322 | static const struct of_device_id xgpio_of_match[] = { |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 323 | { .compatible = "xlnx,xps-gpio-1.00.a", }, |
| 324 | { /* end of list */ }, |
| 325 | }; |
| 326 | |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 327 | MODULE_DEVICE_TABLE(of, xgpio_of_match); |
| 328 | |
| 329 | static struct platform_driver xgpio_plat_driver = { |
| 330 | .probe = xgpio_probe, |
| 331 | .remove = xgpio_remove, |
| 332 | .driver = { |
| 333 | .name = "gpio-xilinx", |
| 334 | .of_match_table = xgpio_of_match, |
| 335 | }, |
| 336 | }; |
| 337 | |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 338 | static int __init xgpio_init(void) |
| 339 | { |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 340 | return platform_driver_register(&xgpio_plat_driver); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 341 | } |
| 342 | |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 343 | subsys_initcall(xgpio_init); |
Ricardo Ribalda Delgado | 749564f | 2014-12-17 16:51:09 +0100 | [diff] [blame] | 344 | |
| 345 | static void __exit xgpio_exit(void) |
| 346 | { |
| 347 | platform_driver_unregister(&xgpio_plat_driver); |
| 348 | } |
| 349 | module_exit(xgpio_exit); |
John Linn | 0bcb606 | 2008-11-12 13:25:38 -0800 | [diff] [blame] | 350 | |
| 351 | MODULE_AUTHOR("Xilinx, Inc."); |
| 352 | MODULE_DESCRIPTION("Xilinx GPIO driver"); |
| 353 | MODULE_LICENSE("GPL"); |