Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/common/amba.c |
| 3 | * |
| 4 | * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved. |
| 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 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/device.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 13 | #include <linux/string.h> |
| 14 | #include <linux/slab.h> |
Russell King | 934848d | 2009-01-08 09:58:51 +0000 | [diff] [blame] | 15 | #include <linux/io.h> |
Rabin Vincent | ba74ec7 | 2011-02-23 04:33:17 +0100 | [diff] [blame] | 16 | #include <linux/pm.h> |
| 17 | #include <linux/pm_runtime.h> |
Russell King | a62c80e | 2006-01-07 13:52:45 +0000 | [diff] [blame] | 18 | #include <linux/amba/bus.h> |
Alessandro Rubini | a875cfb | 2012-06-24 12:46:16 +0100 | [diff] [blame] | 19 | #include <linux/sizes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Russell King | 934848d | 2009-01-08 09:58:51 +0000 | [diff] [blame] | 21 | #include <asm/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #define to_amba_driver(d) container_of(d, struct amba_driver, drv) |
| 24 | |
Russell King | c862aab | 2011-02-19 15:55:26 +0000 | [diff] [blame] | 25 | static const struct amba_id * |
| 26 | amba_lookup(const struct amba_id *table, struct amba_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
| 28 | int ret = 0; |
| 29 | |
| 30 | while (table->mask) { |
| 31 | ret = (dev->periphid & table->mask) == table->id; |
| 32 | if (ret) |
| 33 | break; |
| 34 | table++; |
| 35 | } |
| 36 | |
| 37 | return ret ? table : NULL; |
| 38 | } |
| 39 | |
| 40 | static int amba_match(struct device *dev, struct device_driver *drv) |
| 41 | { |
| 42 | struct amba_device *pcdev = to_amba_device(dev); |
| 43 | struct amba_driver *pcdrv = to_amba_driver(drv); |
| 44 | |
| 45 | return amba_lookup(pcdrv->id_table, pcdev) != NULL; |
| 46 | } |
| 47 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 48 | static int amba_uevent(struct device *dev, struct kobj_uevent_env *env) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | { |
| 50 | struct amba_device *pcdev = to_amba_device(dev); |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 51 | int retval = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 53 | retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid); |
Dave Martin | 523817b | 2011-10-05 14:44:57 +0100 | [diff] [blame] | 54 | if (retval) |
| 55 | return retval; |
| 56 | |
| 57 | retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid); |
Eric Rannaud | bf62456 | 2007-03-30 22:23:12 -0700 | [diff] [blame] | 58 | return retval; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 61 | #define amba_attr_func(name,fmt,arg...) \ |
| 62 | static ssize_t name##_show(struct device *_dev, \ |
| 63 | struct device_attribute *attr, char *buf) \ |
| 64 | { \ |
| 65 | struct amba_device *dev = to_amba_device(_dev); \ |
| 66 | return sprintf(buf, fmt, arg); \ |
| 67 | } |
| 68 | |
| 69 | #define amba_attr(name,fmt,arg...) \ |
| 70 | amba_attr_func(name,fmt,arg) \ |
| 71 | static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL) |
| 72 | |
| 73 | amba_attr_func(id, "%08x\n", dev->periphid); |
| 74 | amba_attr(irq0, "%u\n", dev->irq[0]); |
| 75 | amba_attr(irq1, "%u\n", dev->irq[1]); |
| 76 | amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n", |
| 77 | (unsigned long long)dev->res.start, (unsigned long long)dev->res.end, |
| 78 | dev->res.flags); |
| 79 | |
| 80 | static struct device_attribute amba_dev_attrs[] = { |
| 81 | __ATTR_RO(id), |
| 82 | __ATTR_RO(resource), |
| 83 | __ATTR_NULL, |
| 84 | }; |
| 85 | |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 86 | #ifdef CONFIG_PM_RUNTIME |
| 87 | /* |
| 88 | * Hooks to provide runtime PM of the pclk (bus clock). It is safe to |
| 89 | * enable/disable the bus clock at runtime PM suspend/resume as this |
Mark Brown | 1e45860 | 2012-04-13 13:11:50 +0100 | [diff] [blame] | 90 | * does not result in loss of context. |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 91 | */ |
| 92 | static int amba_pm_runtime_suspend(struct device *dev) |
| 93 | { |
| 94 | struct amba_device *pcdev = to_amba_device(dev); |
| 95 | int ret = pm_generic_runtime_suspend(dev); |
| 96 | |
| 97 | if (ret == 0 && dev->driver) |
Ulf Hansson | 5303c0f | 2013-12-09 10:40:22 +0100 | [diff] [blame^] | 98 | clk_disable_unprepare(pcdev->pclk); |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 99 | |
| 100 | return ret; |
| 101 | } |
| 102 | |
| 103 | static int amba_pm_runtime_resume(struct device *dev) |
| 104 | { |
| 105 | struct amba_device *pcdev = to_amba_device(dev); |
| 106 | int ret; |
| 107 | |
| 108 | if (dev->driver) { |
Ulf Hansson | 5303c0f | 2013-12-09 10:40:22 +0100 | [diff] [blame^] | 109 | ret = clk_prepare_enable(pcdev->pclk); |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 110 | /* Failure is probably fatal to the system, but... */ |
| 111 | if (ret) |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | return pm_generic_runtime_resume(dev); |
| 116 | } |
| 117 | #endif |
| 118 | |
Rabin Vincent | ba74ec7 | 2011-02-23 04:33:17 +0100 | [diff] [blame] | 119 | static const struct dev_pm_ops amba_pm = { |
Ulf Hansson | 26825cf | 2013-12-09 10:38:20 +0100 | [diff] [blame] | 120 | .suspend = pm_generic_suspend, |
| 121 | .resume = pm_generic_resume, |
| 122 | .freeze = pm_generic_freeze, |
| 123 | .thaw = pm_generic_thaw, |
| 124 | .poweroff = pm_generic_poweroff, |
| 125 | .restore = pm_generic_restore, |
Rabin Vincent | ba74ec7 | 2011-02-23 04:33:17 +0100 | [diff] [blame] | 126 | SET_RUNTIME_PM_OPS( |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 127 | amba_pm_runtime_suspend, |
| 128 | amba_pm_runtime_resume, |
Rafael J. Wysocki | 45f0a85 | 2013-06-03 21:49:52 +0200 | [diff] [blame] | 129 | NULL |
Rabin Vincent | ba74ec7 | 2011-02-23 04:33:17 +0100 | [diff] [blame] | 130 | ) |
| 131 | }; |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
| 134 | * Primecells are part of the Advanced Microcontroller Bus Architecture, |
| 135 | * so we call the bus "amba". |
| 136 | */ |
Rob Herring | 394d5ae | 2011-02-12 15:58:25 +0100 | [diff] [blame] | 137 | struct bus_type amba_bustype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | .name = "amba", |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 139 | .dev_attrs = amba_dev_attrs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | .match = amba_match, |
Paul Jackson | 6d20b03 | 2005-11-25 20:04:26 -0800 | [diff] [blame] | 141 | .uevent = amba_uevent, |
Ulf Hansson | 26825cf | 2013-12-09 10:38:20 +0100 | [diff] [blame] | 142 | .pm = &amba_pm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | }; |
| 144 | |
| 145 | static int __init amba_init(void) |
| 146 | { |
| 147 | return bus_register(&amba_bustype); |
| 148 | } |
| 149 | |
| 150 | postcore_initcall(amba_init); |
| 151 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 152 | static int amba_get_enable_pclk(struct amba_device *pcdev) |
| 153 | { |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 154 | int ret; |
| 155 | |
Ulf Hansson | 89a5c98 | 2013-12-09 10:39:13 +0100 | [diff] [blame] | 156 | pcdev->pclk = clk_get(&pcdev->dev, "apb_pclk"); |
| 157 | if (IS_ERR(pcdev->pclk)) |
| 158 | return PTR_ERR(pcdev->pclk); |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 159 | |
Ulf Hansson | 89a5c98 | 2013-12-09 10:39:13 +0100 | [diff] [blame] | 160 | ret = clk_prepare_enable(pcdev->pclk); |
| 161 | if (ret) |
| 162 | clk_put(pcdev->pclk); |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 163 | |
| 164 | return ret; |
| 165 | } |
| 166 | |
| 167 | static void amba_put_disable_pclk(struct amba_device *pcdev) |
| 168 | { |
Ulf Hansson | 89a5c98 | 2013-12-09 10:39:13 +0100 | [diff] [blame] | 169 | clk_disable_unprepare(pcdev->pclk); |
| 170 | clk_put(pcdev->pclk); |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 171 | } |
| 172 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | /* |
| 174 | * These are the device model conversion veneers; they convert the |
| 175 | * device model structures to our more specific structures. |
| 176 | */ |
| 177 | static int amba_probe(struct device *dev) |
| 178 | { |
| 179 | struct amba_device *pcdev = to_amba_device(dev); |
| 180 | struct amba_driver *pcdrv = to_amba_driver(dev->driver); |
Russell King | c862aab | 2011-02-19 15:55:26 +0000 | [diff] [blame] | 181 | const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev); |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 182 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 184 | do { |
| 185 | ret = amba_get_enable_pclk(pcdev); |
| 186 | if (ret) |
| 187 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 189 | pm_runtime_get_noresume(dev); |
| 190 | pm_runtime_set_active(dev); |
| 191 | pm_runtime_enable(dev); |
| 192 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 193 | ret = pcdrv->probe(pcdev, id); |
| 194 | if (ret == 0) |
| 195 | break; |
| 196 | |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 197 | pm_runtime_disable(dev); |
| 198 | pm_runtime_set_suspended(dev); |
| 199 | pm_runtime_put_noidle(dev); |
| 200 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 201 | amba_put_disable_pclk(pcdev); |
| 202 | } while (0); |
| 203 | |
| 204 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | static int amba_remove(struct device *dev) |
| 208 | { |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 209 | struct amba_device *pcdev = to_amba_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | struct amba_driver *drv = to_amba_driver(dev->driver); |
Russell King | 92b97f0 | 2011-08-14 09:13:48 +0100 | [diff] [blame] | 211 | int ret; |
| 212 | |
| 213 | pm_runtime_get_sync(dev); |
| 214 | ret = drv->remove(pcdev); |
| 215 | pm_runtime_put_noidle(dev); |
| 216 | |
| 217 | /* Undo the runtime PM settings in amba_probe() */ |
| 218 | pm_runtime_disable(dev); |
| 219 | pm_runtime_set_suspended(dev); |
| 220 | pm_runtime_put_noidle(dev); |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 221 | |
| 222 | amba_put_disable_pclk(pcdev); |
| 223 | |
| 224 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | static void amba_shutdown(struct device *dev) |
| 228 | { |
| 229 | struct amba_driver *drv = to_amba_driver(dev->driver); |
| 230 | drv->shutdown(to_amba_device(dev)); |
| 231 | } |
| 232 | |
| 233 | /** |
| 234 | * amba_driver_register - register an AMBA device driver |
| 235 | * @drv: amba device driver structure |
| 236 | * |
| 237 | * Register an AMBA device driver with the Linux device model |
| 238 | * core. If devices pre-exist, the drivers probe function will |
| 239 | * be called. |
| 240 | */ |
| 241 | int amba_driver_register(struct amba_driver *drv) |
| 242 | { |
| 243 | drv->drv.bus = &amba_bustype; |
| 244 | |
| 245 | #define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn |
| 246 | SETFN(probe); |
| 247 | SETFN(remove); |
| 248 | SETFN(shutdown); |
| 249 | |
| 250 | return driver_register(&drv->drv); |
| 251 | } |
| 252 | |
| 253 | /** |
| 254 | * amba_driver_unregister - remove an AMBA device driver |
| 255 | * @drv: AMBA device driver structure to remove |
| 256 | * |
| 257 | * Unregister an AMBA device driver from the Linux device |
| 258 | * model. The device model will call the drivers remove function |
| 259 | * for each device the device driver is currently handling. |
| 260 | */ |
| 261 | void amba_driver_unregister(struct amba_driver *drv) |
| 262 | { |
| 263 | driver_unregister(&drv->drv); |
| 264 | } |
| 265 | |
| 266 | |
| 267 | static void amba_device_release(struct device *dev) |
| 268 | { |
| 269 | struct amba_device *d = to_amba_device(dev); |
| 270 | |
| 271 | if (d->res.parent) |
| 272 | release_resource(&d->res); |
| 273 | kfree(d); |
| 274 | } |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | /** |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 277 | * amba_device_add - add a previously allocated AMBA device structure |
| 278 | * @dev: AMBA device allocated by amba_device_alloc |
| 279 | * @parent: resource parent for this devices resources |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | * |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 281 | * Claim the resource, and read the device cell ID if not already |
| 282 | * initialized. Register the AMBA device with the Linux device |
| 283 | * manager. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | */ |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 285 | int amba_device_add(struct amba_device *dev, struct resource *parent) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Leo Chen | 8afe0b9 | 2009-07-28 23:34:59 +0100 | [diff] [blame] | 287 | u32 size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | void __iomem *tmp; |
| 289 | int i, ret; |
| 290 | |
Russell King | 2eac58d | 2011-12-18 11:43:56 +0000 | [diff] [blame] | 291 | WARN_ON(dev->irq[0] == (unsigned int)-1); |
| 292 | WARN_ON(dev->irq[1] == (unsigned int)-1); |
| 293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | ret = request_resource(parent, &dev->res); |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 295 | if (ret) |
| 296 | goto err_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | |
Linus Walleij | 97ceed1 | 2011-03-24 16:12:40 +0100 | [diff] [blame] | 298 | /* Hard-coded primecell ID instead of plug-n-play */ |
| 299 | if (dev->periphid != 0) |
| 300 | goto skip_probe; |
| 301 | |
Leo Chen | 8afe0b9 | 2009-07-28 23:34:59 +0100 | [diff] [blame] | 302 | /* |
| 303 | * Dynamically calculate the size of the resource |
| 304 | * and use this for iomap |
| 305 | */ |
| 306 | size = resource_size(&dev->res); |
| 307 | tmp = ioremap(dev->res.start, size); |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 308 | if (!tmp) { |
| 309 | ret = -ENOMEM; |
| 310 | goto err_release; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 312 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 313 | ret = amba_get_enable_pclk(dev); |
| 314 | if (ret == 0) { |
| 315 | u32 pid, cid; |
| 316 | |
| 317 | /* |
| 318 | * Read pid and cid based on size of resource |
| 319 | * they are located at end of region |
| 320 | */ |
| 321 | for (pid = 0, i = 0; i < 4; i++) |
| 322 | pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) << |
| 323 | (i * 8); |
| 324 | for (cid = 0, i = 0; i < 4; i++) |
| 325 | cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) << |
| 326 | (i * 8); |
| 327 | |
| 328 | amba_put_disable_pclk(dev); |
| 329 | |
Linus Walleij | 01723a9 | 2010-09-07 22:43:19 +0100 | [diff] [blame] | 330 | if (cid == AMBA_CID) |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 331 | dev->periphid = pid; |
| 332 | |
| 333 | if (!dev->periphid) |
| 334 | ret = -ENODEV; |
| 335 | } |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 336 | |
| 337 | iounmap(tmp); |
| 338 | |
Russell King | 7cfe249 | 2010-07-15 10:47:14 +0100 | [diff] [blame] | 339 | if (ret) |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 340 | goto err_release; |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 341 | |
Linus Walleij | 97ceed1 | 2011-03-24 16:12:40 +0100 | [diff] [blame] | 342 | skip_probe: |
Russell King | 557dca5 | 2009-07-05 22:39:08 +0100 | [diff] [blame] | 343 | ret = device_add(&dev->dev); |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 344 | if (ret) |
| 345 | goto err_release; |
| 346 | |
Russell King | dfb8518 | 2012-05-03 11:33:15 +0100 | [diff] [blame] | 347 | if (dev->irq[0]) |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 348 | ret = device_create_file(&dev->dev, &dev_attr_irq0); |
Russell King | dfb8518 | 2012-05-03 11:33:15 +0100 | [diff] [blame] | 349 | if (ret == 0 && dev->irq[1]) |
Russell King | 96b13f5 | 2006-11-30 14:04:49 +0000 | [diff] [blame] | 350 | ret = device_create_file(&dev->dev, &dev_attr_irq1); |
| 351 | if (ret == 0) |
| 352 | return ret; |
| 353 | |
| 354 | device_unregister(&dev->dev); |
| 355 | |
| 356 | err_release: |
| 357 | release_resource(&dev->res); |
| 358 | err_out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | return ret; |
| 360 | } |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 361 | EXPORT_SYMBOL_GPL(amba_device_add); |
| 362 | |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 363 | static struct amba_device * |
| 364 | amba_aphb_device_add(struct device *parent, const char *name, |
| 365 | resource_size_t base, size_t size, int irq1, int irq2, |
Linus Walleij | 3ad909b | 2012-11-30 16:30:43 +0100 | [diff] [blame] | 366 | void *pdata, unsigned int periphid, u64 dma_mask, |
| 367 | struct resource *resbase) |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 368 | { |
| 369 | struct amba_device *dev; |
| 370 | int ret; |
| 371 | |
| 372 | dev = amba_device_alloc(name, base, size); |
| 373 | if (!dev) |
| 374 | return ERR_PTR(-ENOMEM); |
| 375 | |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 376 | dev->dev.coherent_dma_mask = dma_mask; |
| 377 | dev->irq[0] = irq1; |
| 378 | dev->irq[1] = irq2; |
| 379 | dev->periphid = periphid; |
| 380 | dev->dev.platform_data = pdata; |
| 381 | dev->dev.parent = parent; |
| 382 | |
Linus Walleij | 3ad909b | 2012-11-30 16:30:43 +0100 | [diff] [blame] | 383 | ret = amba_device_add(dev, resbase); |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 384 | if (ret) { |
| 385 | amba_device_put(dev); |
| 386 | return ERR_PTR(ret); |
| 387 | } |
| 388 | |
| 389 | return dev; |
| 390 | } |
| 391 | |
| 392 | struct amba_device * |
| 393 | amba_apb_device_add(struct device *parent, const char *name, |
| 394 | resource_size_t base, size_t size, int irq1, int irq2, |
| 395 | void *pdata, unsigned int periphid) |
| 396 | { |
| 397 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
Linus Walleij | 3ad909b | 2012-11-30 16:30:43 +0100 | [diff] [blame] | 398 | periphid, 0, &iomem_resource); |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 399 | } |
| 400 | EXPORT_SYMBOL_GPL(amba_apb_device_add); |
| 401 | |
| 402 | struct amba_device * |
| 403 | amba_ahb_device_add(struct device *parent, const char *name, |
| 404 | resource_size_t base, size_t size, int irq1, int irq2, |
| 405 | void *pdata, unsigned int periphid) |
| 406 | { |
| 407 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
Linus Walleij | 3ad909b | 2012-11-30 16:30:43 +0100 | [diff] [blame] | 408 | periphid, ~0ULL, &iomem_resource); |
Linus Walleij | 6026aa9 | 2012-04-03 11:58:42 +0100 | [diff] [blame] | 409 | } |
| 410 | EXPORT_SYMBOL_GPL(amba_ahb_device_add); |
| 411 | |
Linus Walleij | 3ad909b | 2012-11-30 16:30:43 +0100 | [diff] [blame] | 412 | struct amba_device * |
| 413 | amba_apb_device_add_res(struct device *parent, const char *name, |
| 414 | resource_size_t base, size_t size, int irq1, |
| 415 | int irq2, void *pdata, unsigned int periphid, |
| 416 | struct resource *resbase) |
| 417 | { |
| 418 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
| 419 | periphid, 0, resbase); |
| 420 | } |
| 421 | EXPORT_SYMBOL_GPL(amba_apb_device_add_res); |
| 422 | |
| 423 | struct amba_device * |
| 424 | amba_ahb_device_add_res(struct device *parent, const char *name, |
| 425 | resource_size_t base, size_t size, int irq1, |
| 426 | int irq2, void *pdata, unsigned int periphid, |
| 427 | struct resource *resbase) |
| 428 | { |
| 429 | return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata, |
| 430 | periphid, ~0ULL, resbase); |
| 431 | } |
| 432 | EXPORT_SYMBOL_GPL(amba_ahb_device_add_res); |
| 433 | |
| 434 | |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 435 | static void amba_device_initialize(struct amba_device *dev, const char *name) |
| 436 | { |
| 437 | device_initialize(&dev->dev); |
| 438 | if (name) |
| 439 | dev_set_name(&dev->dev, "%s", name); |
| 440 | dev->dev.release = amba_device_release; |
| 441 | dev->dev.bus = &amba_bustype; |
Russell King | 446b2a9 | 2013-06-27 10:25:33 +0100 | [diff] [blame] | 442 | dev->dev.dma_mask = &dev->dev.coherent_dma_mask; |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 443 | dev->res.name = dev_name(&dev->dev); |
| 444 | } |
| 445 | |
| 446 | /** |
| 447 | * amba_device_alloc - allocate an AMBA device |
| 448 | * @name: sysfs name of the AMBA device |
| 449 | * @base: base of AMBA device |
| 450 | * @size: size of AMBA device |
| 451 | * |
| 452 | * Allocate and initialize an AMBA device structure. Returns %NULL |
| 453 | * on failure. |
| 454 | */ |
| 455 | struct amba_device *amba_device_alloc(const char *name, resource_size_t base, |
| 456 | size_t size) |
| 457 | { |
| 458 | struct amba_device *dev; |
| 459 | |
| 460 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 461 | if (dev) { |
| 462 | amba_device_initialize(dev, name); |
| 463 | dev->res.start = base; |
| 464 | dev->res.end = base + size - 1; |
| 465 | dev->res.flags = IORESOURCE_MEM; |
| 466 | } |
| 467 | |
| 468 | return dev; |
| 469 | } |
| 470 | EXPORT_SYMBOL_GPL(amba_device_alloc); |
| 471 | |
| 472 | /** |
| 473 | * amba_device_register - register an AMBA device |
| 474 | * @dev: AMBA device to register |
| 475 | * @parent: parent memory resource |
| 476 | * |
| 477 | * Setup the AMBA device, reading the cell ID if present. |
| 478 | * Claim the resource, and register the AMBA device with |
| 479 | * the Linux device manager. |
| 480 | */ |
| 481 | int amba_device_register(struct amba_device *dev, struct resource *parent) |
| 482 | { |
| 483 | amba_device_initialize(dev, dev->dev.init_name); |
| 484 | dev->dev.init_name = NULL; |
| 485 | |
Russell King | d5dc927 | 2011-12-18 11:07:47 +0000 | [diff] [blame] | 486 | return amba_device_add(dev, parent); |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * amba_device_put - put an AMBA device |
| 491 | * @dev: AMBA device to put |
| 492 | */ |
| 493 | void amba_device_put(struct amba_device *dev) |
| 494 | { |
| 495 | put_device(&dev->dev); |
| 496 | } |
| 497 | EXPORT_SYMBOL_GPL(amba_device_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | |
| 499 | /** |
| 500 | * amba_device_unregister - unregister an AMBA device |
| 501 | * @dev: AMBA device to remove |
| 502 | * |
| 503 | * Remove the specified AMBA device from the Linux device |
| 504 | * manager. All files associated with this object will be |
| 505 | * destroyed, and device drivers notified that the device has |
| 506 | * been removed. The AMBA device's resources including |
| 507 | * the amba_device structure will be freed once all |
| 508 | * references to it have been dropped. |
| 509 | */ |
| 510 | void amba_device_unregister(struct amba_device *dev) |
| 511 | { |
| 512 | device_unregister(&dev->dev); |
| 513 | } |
| 514 | |
| 515 | |
| 516 | struct find_data { |
| 517 | struct amba_device *dev; |
| 518 | struct device *parent; |
| 519 | const char *busid; |
| 520 | unsigned int id; |
| 521 | unsigned int mask; |
| 522 | }; |
| 523 | |
| 524 | static int amba_find_match(struct device *dev, void *data) |
| 525 | { |
| 526 | struct find_data *d = data; |
| 527 | struct amba_device *pcdev = to_amba_device(dev); |
| 528 | int r; |
| 529 | |
| 530 | r = (pcdev->periphid & d->mask) == d->id; |
| 531 | if (d->parent) |
| 532 | r &= d->parent == dev->parent; |
| 533 | if (d->busid) |
Kay Sievers | 9d6b4c8 | 2009-03-24 16:38:22 -0700 | [diff] [blame] | 534 | r &= strcmp(dev_name(dev), d->busid) == 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | |
| 536 | if (r) { |
| 537 | get_device(dev); |
| 538 | d->dev = pcdev; |
| 539 | } |
| 540 | |
| 541 | return r; |
| 542 | } |
| 543 | |
| 544 | /** |
| 545 | * amba_find_device - locate an AMBA device given a bus id |
| 546 | * @busid: bus id for device (or NULL) |
| 547 | * @parent: parent device (or NULL) |
| 548 | * @id: peripheral ID (or 0) |
| 549 | * @mask: peripheral ID mask (or 0) |
| 550 | * |
| 551 | * Return the AMBA device corresponding to the supplied parameters. |
| 552 | * If no device matches, returns NULL. |
| 553 | * |
| 554 | * NOTE: When a valid device is found, its refcount is |
| 555 | * incremented, and must be decremented before the returned |
| 556 | * reference. |
| 557 | */ |
| 558 | struct amba_device * |
| 559 | amba_find_device(const char *busid, struct device *parent, unsigned int id, |
| 560 | unsigned int mask) |
| 561 | { |
| 562 | struct find_data data; |
| 563 | |
| 564 | data.dev = NULL; |
| 565 | data.parent = parent; |
| 566 | data.busid = busid; |
| 567 | data.id = id; |
| 568 | data.mask = mask; |
| 569 | |
| 570 | bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match); |
| 571 | |
| 572 | return data.dev; |
| 573 | } |
| 574 | |
| 575 | /** |
| 576 | * amba_request_regions - request all mem regions associated with device |
| 577 | * @dev: amba_device structure for device |
| 578 | * @name: name, or NULL to use driver name |
| 579 | */ |
| 580 | int amba_request_regions(struct amba_device *dev, const char *name) |
| 581 | { |
| 582 | int ret = 0; |
Leo Chen | 8afe0b9 | 2009-07-28 23:34:59 +0100 | [diff] [blame] | 583 | u32 size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | |
| 585 | if (!name) |
| 586 | name = dev->dev.driver->name; |
| 587 | |
Leo Chen | 8afe0b9 | 2009-07-28 23:34:59 +0100 | [diff] [blame] | 588 | size = resource_size(&dev->res); |
| 589 | |
| 590 | if (!request_mem_region(dev->res.start, size, name)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | ret = -EBUSY; |
| 592 | |
| 593 | return ret; |
| 594 | } |
| 595 | |
| 596 | /** |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 597 | * amba_release_regions - release mem regions associated with device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | * @dev: amba_device structure for device |
| 599 | * |
| 600 | * Release regions claimed by a successful call to amba_request_regions. |
| 601 | */ |
| 602 | void amba_release_regions(struct amba_device *dev) |
| 603 | { |
Leo Chen | 8afe0b9 | 2009-07-28 23:34:59 +0100 | [diff] [blame] | 604 | u32 size; |
| 605 | |
| 606 | size = resource_size(&dev->res); |
| 607 | release_mem_region(dev->res.start, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
| 610 | EXPORT_SYMBOL(amba_driver_register); |
| 611 | EXPORT_SYMBOL(amba_driver_unregister); |
| 612 | EXPORT_SYMBOL(amba_device_register); |
| 613 | EXPORT_SYMBOL(amba_device_unregister); |
| 614 | EXPORT_SYMBOL(amba_find_device); |
| 615 | EXPORT_SYMBOL(amba_request_regions); |
| 616 | EXPORT_SYMBOL(amba_release_regions); |