Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Support code for the SCOOP interface found on various Sharp PDAs |
| 4 | * |
| 5 | * Copyright (c) 2004 Richard Purdie |
| 6 | * |
| 7 | * Based on code written by Sharp/Lineo for 2.4 kernels |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/device.h> |
Russell King | 2f8163b | 2011-07-26 10:53:52 +0100 | [diff] [blame] | 11 | #include <linux/gpio.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 12 | #include <linux/string.h> |
Tim Schmielau | de25968 | 2006-01-08 01:02:05 -0800 | [diff] [blame] | 13 | #include <linux/slab.h> |
Russell King | d052d1b | 2005-10-29 19:07:23 +0100 | [diff] [blame] | 14 | #include <linux/platform_device.h> |
Paul Gortmaker | dc28094 | 2011-07-31 16:17:29 -0400 | [diff] [blame] | 15 | #include <linux/export.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 16 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/hardware/scoop.h> |
| 18 | |
Richard Purdie | 7ea3bbb | 2006-04-18 23:18:53 +0100 | [diff] [blame] | 19 | /* PCMCIA to Scoop linkage |
| 20 | |
| 21 | There is no easy way to link multiple scoop devices into one |
| 22 | single entity for the pxa2xx_pcmcia device so this structure |
| 23 | is used which is setup by the platform code. |
| 24 | |
| 25 | This file is never modular so this symbol is always |
| 26 | accessile to the board support files. |
| 27 | */ |
| 28 | struct scoop_pcmcia_config *platform_scoop_config; |
| 29 | EXPORT_SYMBOL(platform_scoop_config); |
| 30 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct scoop_dev { |
Dmitry Baryshkov | 2f8c514 | 2008-04-09 22:43:37 +0100 | [diff] [blame] | 32 | void __iomem *base; |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 33 | struct gpio_chip gpio; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | spinlock_t scoop_lock; |
Richard Purdie | 7c39898 | 2005-10-10 10:20:06 +0100 | [diff] [blame] | 35 | unsigned short suspend_clr; |
| 36 | unsigned short suspend_set; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | u32 scoop_gpwr; |
| 38 | }; |
| 39 | |
| 40 | void reset_scoop(struct device *dev) |
| 41 | { |
| 42 | struct scoop_dev *sdev = dev_get_drvdata(dev); |
| 43 | |
H Hartley Sweeten | aa88bc0 | 2010-08-06 09:36:42 -0700 | [diff] [blame] | 44 | iowrite16(0x0100, sdev->base + SCOOP_MCR); /* 00 */ |
| 45 | iowrite16(0x0000, sdev->base + SCOOP_CDR); /* 04 */ |
| 46 | iowrite16(0x0000, sdev->base + SCOOP_CCR); /* 10 */ |
| 47 | iowrite16(0x0000, sdev->base + SCOOP_IMR); /* 18 */ |
| 48 | iowrite16(0x00FF, sdev->base + SCOOP_IRM); /* 14 */ |
| 49 | iowrite16(0x0000, sdev->base + SCOOP_ISR); /* 1C */ |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 50 | iowrite16(0x0000, sdev->base + SCOOP_IRM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 53 | static void __scoop_gpio_set(struct scoop_dev *sdev, |
| 54 | unsigned offset, int value) |
| 55 | { |
| 56 | unsigned short gpwr; |
| 57 | |
| 58 | gpwr = ioread16(sdev->base + SCOOP_GPWR); |
| 59 | if (value) |
| 60 | gpwr |= 1 << (offset + 1); |
| 61 | else |
| 62 | gpwr &= ~(1 << (offset + 1)); |
| 63 | iowrite16(gpwr, sdev->base + SCOOP_GPWR); |
| 64 | } |
| 65 | |
| 66 | static void scoop_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 67 | { |
Linus Walleij | 050c542 | 2015-12-08 10:51:43 +0100 | [diff] [blame] | 68 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 69 | unsigned long flags; |
| 70 | |
| 71 | spin_lock_irqsave(&sdev->scoop_lock, flags); |
| 72 | |
| 73 | __scoop_gpio_set(sdev, offset, value); |
| 74 | |
| 75 | spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
| 76 | } |
| 77 | |
| 78 | static int scoop_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 79 | { |
Linus Walleij | 050c542 | 2015-12-08 10:51:43 +0100 | [diff] [blame] | 80 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 81 | |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 82 | /* XXX: I'm unsure, but it seems so */ |
Linus Walleij | 86d5e65 | 2015-12-22 15:35:47 +0100 | [diff] [blame] | 83 | return !!(ioread16(sdev->base + SCOOP_GPRR) & (1 << (offset + 1))); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 84 | } |
| 85 | |
| 86 | static int scoop_gpio_direction_input(struct gpio_chip *chip, |
| 87 | unsigned offset) |
| 88 | { |
Linus Walleij | 050c542 | 2015-12-08 10:51:43 +0100 | [diff] [blame] | 89 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 90 | unsigned long flags; |
| 91 | unsigned short gpcr; |
| 92 | |
| 93 | spin_lock_irqsave(&sdev->scoop_lock, flags); |
| 94 | |
| 95 | gpcr = ioread16(sdev->base + SCOOP_GPCR); |
| 96 | gpcr &= ~(1 << (offset + 1)); |
| 97 | iowrite16(gpcr, sdev->base + SCOOP_GPCR); |
| 98 | |
| 99 | spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static int scoop_gpio_direction_output(struct gpio_chip *chip, |
| 105 | unsigned offset, int value) |
| 106 | { |
Linus Walleij | 050c542 | 2015-12-08 10:51:43 +0100 | [diff] [blame] | 107 | struct scoop_dev *sdev = gpiochip_get_data(chip); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 108 | unsigned long flags; |
| 109 | unsigned short gpcr; |
| 110 | |
| 111 | spin_lock_irqsave(&sdev->scoop_lock, flags); |
| 112 | |
| 113 | __scoop_gpio_set(sdev, offset, value); |
| 114 | |
| 115 | gpcr = ioread16(sdev->base + SCOOP_GPCR); |
| 116 | gpcr |= 1 << (offset + 1); |
| 117 | iowrite16(gpcr, sdev->base + SCOOP_GPCR); |
| 118 | |
| 119 | spin_unlock_irqrestore(&sdev->scoop_lock, flags); |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | unsigned short read_scoop_reg(struct device *dev, unsigned short reg) |
| 125 | { |
| 126 | struct scoop_dev *sdev = dev_get_drvdata(dev); |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 127 | return ioread16(sdev->base + reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | } |
| 129 | |
| 130 | void write_scoop_reg(struct device *dev, unsigned short reg, unsigned short data) |
| 131 | { |
| 132 | struct scoop_dev *sdev = dev_get_drvdata(dev); |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 133 | iowrite16(data, sdev->base + reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | EXPORT_SYMBOL(reset_scoop); |
| 137 | EXPORT_SYMBOL(read_scoop_reg); |
| 138 | EXPORT_SYMBOL(write_scoop_reg); |
| 139 | |
Stefan Schmidt | cfab57e | 2010-02-16 22:41:52 +0100 | [diff] [blame] | 140 | #ifdef CONFIG_PM |
Richard Purdie | 7c39898 | 2005-10-10 10:20:06 +0100 | [diff] [blame] | 141 | static void check_scoop_reg(struct scoop_dev *sdev) |
| 142 | { |
| 143 | unsigned short mcr; |
| 144 | |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 145 | mcr = ioread16(sdev->base + SCOOP_MCR); |
Richard Purdie | 7c39898 | 2005-10-10 10:20:06 +0100 | [diff] [blame] | 146 | if ((mcr & 0x100) == 0) |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 147 | iowrite16(0x0101, sdev->base + SCOOP_MCR); |
Richard Purdie | 7c39898 | 2005-10-10 10:20:06 +0100 | [diff] [blame] | 148 | } |
| 149 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 150 | static int scoop_suspend(struct platform_device *dev, pm_message_t state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 152 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 154 | check_scoop_reg(sdev); |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 155 | sdev->scoop_gpwr = ioread16(sdev->base + SCOOP_GPWR); |
| 156 | iowrite16((sdev->scoop_gpwr & ~sdev->suspend_clr) | sdev->suspend_set, sdev->base + SCOOP_GPWR); |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | return 0; |
| 159 | } |
| 160 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 161 | static int scoop_resume(struct platform_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 163 | struct scoop_dev *sdev = platform_get_drvdata(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 165 | check_scoop_reg(sdev); |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 166 | iowrite16(sdev->scoop_gpwr, sdev->base + SCOOP_GPWR); |
Russell King | 9480e30 | 2005-10-28 09:52:56 -0700 | [diff] [blame] | 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | return 0; |
| 169 | } |
| 170 | #else |
| 171 | #define scoop_suspend NULL |
| 172 | #define scoop_resume NULL |
| 173 | #endif |
| 174 | |
Greg Kroah-Hartman | 351a102 | 2012-12-21 14:02:24 -0800 | [diff] [blame] | 175 | static int scoop_probe(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | { |
| 177 | struct scoop_dev *devptr; |
| 178 | struct scoop_config *inf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | struct resource *mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 180 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | if (!mem) |
| 183 | return -EINVAL; |
| 184 | |
Russell King | d2a02b9 | 2006-03-20 19:46:41 +0000 | [diff] [blame] | 185 | devptr = kzalloc(sizeof(struct scoop_dev), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | if (!devptr) |
Russell King | d2a02b9 | 2006-03-20 19:46:41 +0000 | [diff] [blame] | 187 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | spin_lock_init(&devptr->scoop_lock); |
| 190 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 191 | inf = pdev->dev.platform_data; |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 192 | devptr->base = ioremap(mem->start, resource_size(mem)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | if (!devptr->base) { |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 195 | ret = -ENOMEM; |
| 196 | goto err_ioremap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 199 | platform_set_drvdata(pdev, devptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Dmitry Baryshkov | 2f8c514 | 2008-04-09 22:43:37 +0100 | [diff] [blame] | 201 | printk("Sharp Scoop Device found at 0x%08x -> 0x%8p\n",(unsigned int)mem->start, devptr->base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 203 | iowrite16(0x0140, devptr->base + SCOOP_MCR); |
Pavel Machek | c35bf4a | 2005-11-12 20:25:25 +0000 | [diff] [blame] | 204 | reset_scoop(&pdev->dev); |
Dmitry Baryshkov | c353faa | 2008-04-09 23:05:09 +0100 | [diff] [blame] | 205 | iowrite16(0x0000, devptr->base + SCOOP_CPR); |
| 206 | iowrite16(inf->io_dir & 0xffff, devptr->base + SCOOP_GPCR); |
| 207 | iowrite16(inf->io_out & 0xffff, devptr->base + SCOOP_GPWR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
Richard Purdie | 7c39898 | 2005-10-10 10:20:06 +0100 | [diff] [blame] | 209 | devptr->suspend_clr = inf->suspend_clr; |
| 210 | devptr->suspend_set = inf->suspend_set; |
| 211 | |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 212 | devptr->gpio.base = -1; |
| 213 | |
| 214 | if (inf->gpio_base != 0) { |
Kay Sievers | 3f97870 | 2008-05-30 17:42:11 +0200 | [diff] [blame] | 215 | devptr->gpio.label = dev_name(&pdev->dev); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 216 | devptr->gpio.base = inf->gpio_base; |
| 217 | devptr->gpio.ngpio = 12; /* PA11 = 0, PA12 = 1, etc. up to PA22 = 11 */ |
| 218 | devptr->gpio.set = scoop_gpio_set; |
| 219 | devptr->gpio.get = scoop_gpio_get; |
| 220 | devptr->gpio.direction_input = scoop_gpio_direction_input; |
| 221 | devptr->gpio.direction_output = scoop_gpio_direction_output; |
| 222 | |
Linus Walleij | 050c542 | 2015-12-08 10:51:43 +0100 | [diff] [blame] | 223 | ret = gpiochip_add_data(&devptr->gpio, devptr); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 224 | if (ret) |
| 225 | goto err_gpio; |
| 226 | } |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return 0; |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 229 | |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 230 | err_gpio: |
| 231 | platform_set_drvdata(pdev, NULL); |
| 232 | err_ioremap: |
| 233 | iounmap(devptr->base); |
| 234 | kfree(devptr); |
| 235 | |
| 236 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
| 238 | |
Greg Kroah-Hartman | 351a102 | 2012-12-21 14:02:24 -0800 | [diff] [blame] | 239 | static int scoop_remove(struct platform_device *pdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 241 | struct scoop_dev *sdev = platform_get_drvdata(pdev); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 242 | |
| 243 | if (!sdev) |
| 244 | return -EINVAL; |
| 245 | |
abdoulaye berthe | 88d5e52 | 2014-07-12 22:30:14 +0200 | [diff] [blame] | 246 | if (sdev->gpio.base != -1) |
| 247 | gpiochip_remove(&sdev->gpio); |
Dmitry Baryshkov | b43a9e6 | 2008-04-10 13:36:53 +0100 | [diff] [blame] | 248 | |
| 249 | platform_set_drvdata(pdev, NULL); |
| 250 | iounmap(sdev->base); |
| 251 | kfree(sdev); |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 256 | static struct platform_driver scoop_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | .probe = scoop_probe, |
Greg Kroah-Hartman | 351a102 | 2012-12-21 14:02:24 -0800 | [diff] [blame] | 258 | .remove = scoop_remove, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | .suspend = scoop_suspend, |
| 260 | .resume = scoop_resume, |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 261 | .driver = { |
| 262 | .name = "sharp-scoop", |
| 263 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | }; |
| 265 | |
Dmitry Baryshkov | 2f8c514 | 2008-04-09 22:43:37 +0100 | [diff] [blame] | 266 | static int __init scoop_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | { |
Russell King | 3ae5eae | 2005-11-09 22:32:44 +0000 | [diff] [blame] | 268 | return platform_driver_register(&scoop_driver); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | subsys_initcall(scoop_init); |