Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/mmc/core/host.c |
| 3 | * |
| 4 | * Copyright (C) 2003 Russell King, All Rights Reserved. |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 5 | * Copyright (C) 2007-2008 Pierre Ossman |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 6 | * Copyright (C) 2010 Linus Walleij |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | * MMC host class device management |
| 13 | */ |
| 14 | |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/idr.h> |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 18 | #include <linux/of.h> |
| 19 | #include <linux/of_gpio.h> |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 20 | #include <linux/pagemap.h> |
Paul Gortmaker | 3ef77af | 2011-07-10 12:42:00 -0400 | [diff] [blame] | 21 | #include <linux/export.h> |
Pierre Ossman | af8350c | 2007-09-24 07:15:48 +0200 | [diff] [blame] | 22 | #include <linux/leds.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 23 | #include <linux/slab.h> |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 24 | #include <linux/suspend.h> |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 25 | |
| 26 | #include <linux/mmc/host.h> |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 27 | #include <linux/mmc/card.h> |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 28 | #include <linux/mmc/slot-gpio.h> |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 29 | |
| 30 | #include "core.h" |
| 31 | #include "host.h" |
| 32 | |
| 33 | #define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev) |
| 34 | |
Ulf Hansson | e2d1926 | 2014-12-18 15:44:35 +0100 | [diff] [blame^] | 35 | static DEFINE_IDR(mmc_host_idr); |
| 36 | static DEFINE_SPINLOCK(mmc_host_lock); |
| 37 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 38 | static void mmc_host_classdev_release(struct device *dev) |
| 39 | { |
| 40 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
Guennadi Liakhovetski | a7d1a1e | 2012-05-01 16:51:38 +0200 | [diff] [blame] | 41 | mutex_destroy(&host->slot.lock); |
Ulf Hansson | e2d1926 | 2014-12-18 15:44:35 +0100 | [diff] [blame^] | 42 | spin_lock(&mmc_host_lock); |
| 43 | idr_remove(&mmc_host_idr, host->index); |
| 44 | spin_unlock(&mmc_host_lock); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 45 | kfree(host); |
| 46 | } |
| 47 | |
| 48 | static struct class mmc_host_class = { |
| 49 | .name = "mmc_host", |
| 50 | .dev_release = mmc_host_classdev_release, |
| 51 | }; |
| 52 | |
| 53 | int mmc_register_host_class(void) |
| 54 | { |
| 55 | return class_register(&mmc_host_class); |
| 56 | } |
| 57 | |
| 58 | void mmc_unregister_host_class(void) |
| 59 | { |
| 60 | class_unregister(&mmc_host_class); |
| 61 | } |
| 62 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 63 | #ifdef CONFIG_MMC_CLKGATE |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 64 | static ssize_t clkgate_delay_show(struct device *dev, |
| 65 | struct device_attribute *attr, char *buf) |
| 66 | { |
| 67 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
Stephen Boyd | 4137e50 | 2011-12-05 10:28:44 -0800 | [diff] [blame] | 68 | return snprintf(buf, PAGE_SIZE, "%lu\n", host->clkgate_delay); |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 69 | } |
| 70 | |
| 71 | static ssize_t clkgate_delay_store(struct device *dev, |
| 72 | struct device_attribute *attr, const char *buf, size_t count) |
| 73 | { |
| 74 | struct mmc_host *host = cls_dev_to_mmc_host(dev); |
| 75 | unsigned long flags, value; |
| 76 | |
| 77 | if (kstrtoul(buf, 0, &value)) |
| 78 | return -EINVAL; |
| 79 | |
| 80 | spin_lock_irqsave(&host->clk_lock, flags); |
| 81 | host->clkgate_delay = value; |
| 82 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 83 | return count; |
| 84 | } |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 85 | |
| 86 | /* |
| 87 | * Enabling clock gating will make the core call out to the host |
| 88 | * once up and once down when it performs a request or card operation |
| 89 | * intermingled in any fashion. The driver will see this through |
| 90 | * set_ios() operations with ios.clock field set to 0 to gate (disable) |
| 91 | * the block clock, and to the old frequency to enable it again. |
| 92 | */ |
| 93 | static void mmc_host_clk_gate_delayed(struct mmc_host *host) |
| 94 | { |
| 95 | unsigned long tick_ns; |
| 96 | unsigned long freq = host->ios.clock; |
| 97 | unsigned long flags; |
| 98 | |
| 99 | if (!freq) { |
| 100 | pr_debug("%s: frequency set to 0 in disable function, " |
| 101 | "this means the clock is already disabled.\n", |
| 102 | mmc_hostname(host)); |
| 103 | return; |
| 104 | } |
| 105 | /* |
| 106 | * New requests may have appeared while we were scheduling, |
| 107 | * then there is no reason to delay the check before |
| 108 | * clk_disable(). |
| 109 | */ |
| 110 | spin_lock_irqsave(&host->clk_lock, flags); |
| 111 | |
| 112 | /* |
| 113 | * Delay n bus cycles (at least 8 from MMC spec) before attempting |
| 114 | * to disable the MCI block clock. The reference count may have |
| 115 | * gone up again after this delay due to rescheduling! |
| 116 | */ |
| 117 | if (!host->clk_requests) { |
| 118 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 119 | tick_ns = DIV_ROUND_UP(1000000000, freq); |
| 120 | ndelay(host->clk_delay * tick_ns); |
| 121 | } else { |
| 122 | /* New users appeared while waiting for this work */ |
| 123 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 124 | return; |
| 125 | } |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 126 | mutex_lock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 127 | spin_lock_irqsave(&host->clk_lock, flags); |
| 128 | if (!host->clk_requests) { |
| 129 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 130 | /* This will set host->ios.clock to 0 */ |
| 131 | mmc_gate_clock(host); |
| 132 | spin_lock_irqsave(&host->clk_lock, flags); |
| 133 | pr_debug("%s: gated MCI clock\n", mmc_hostname(host)); |
| 134 | } |
| 135 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 136 | mutex_unlock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Internal work. Work to disable the clock at some later point. |
| 141 | */ |
| 142 | static void mmc_host_clk_gate_work(struct work_struct *work) |
| 143 | { |
| 144 | struct mmc_host *host = container_of(work, struct mmc_host, |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 145 | clk_gate_work.work); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 146 | |
| 147 | mmc_host_clk_gate_delayed(host); |
| 148 | } |
| 149 | |
| 150 | /** |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 151 | * mmc_host_clk_hold - ungate hardware MCI clocks |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 152 | * @host: host to ungate. |
| 153 | * |
| 154 | * Makes sure the host ios.clock is restored to a non-zero value |
| 155 | * past this call. Increase clock reference count and ungate clock |
| 156 | * if we're the first user. |
| 157 | */ |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 158 | void mmc_host_clk_hold(struct mmc_host *host) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 159 | { |
| 160 | unsigned long flags; |
| 161 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 162 | /* cancel any clock gating work scheduled by mmc_host_clk_release() */ |
| 163 | cancel_delayed_work_sync(&host->clk_gate_work); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 164 | mutex_lock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 165 | spin_lock_irqsave(&host->clk_lock, flags); |
| 166 | if (host->clk_gated) { |
| 167 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 168 | mmc_ungate_clock(host); |
| 169 | spin_lock_irqsave(&host->clk_lock, flags); |
| 170 | pr_debug("%s: ungated MCI clock\n", mmc_hostname(host)); |
| 171 | } |
| 172 | host->clk_requests++; |
| 173 | spin_unlock_irqrestore(&host->clk_lock, flags); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 174 | mutex_unlock(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | /** |
| 178 | * mmc_host_may_gate_card - check if this card may be gated |
| 179 | * @card: card to check. |
| 180 | */ |
| 181 | static bool mmc_host_may_gate_card(struct mmc_card *card) |
| 182 | { |
| 183 | /* If there is no card we may gate it */ |
| 184 | if (!card) |
| 185 | return true; |
| 186 | /* |
| 187 | * Don't gate SDIO cards! These need to be clocked at all times |
| 188 | * since they may be independent systems generating interrupts |
| 189 | * and other events. The clock requests counter from the core will |
| 190 | * go down to zero since the core does not need it, but we will not |
| 191 | * gate the clock, because there is somebody out there that may still |
| 192 | * be using it. |
| 193 | */ |
Pierre Tardy | db99350 | 2011-02-06 19:03:47 +0100 | [diff] [blame] | 194 | return !(card->quirks & MMC_QUIRK_BROKEN_CLK_GATING); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | /** |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 198 | * mmc_host_clk_release - gate off hardware MCI clocks |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 199 | * @host: host to gate. |
| 200 | * |
| 201 | * Calls the host driver with ios.clock set to zero as often as possible |
| 202 | * in order to gate off hardware MCI clocks. Decrease clock reference |
| 203 | * count and schedule disabling of clock. |
| 204 | */ |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 205 | void mmc_host_clk_release(struct mmc_host *host) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 206 | { |
| 207 | unsigned long flags; |
| 208 | |
| 209 | spin_lock_irqsave(&host->clk_lock, flags); |
| 210 | host->clk_requests--; |
| 211 | if (mmc_host_may_gate_card(host->card) && |
| 212 | !host->clk_requests) |
Tejun Heo | 3b07e9c | 2012-08-20 14:51:24 -0700 | [diff] [blame] | 213 | schedule_delayed_work(&host->clk_gate_work, |
| 214 | msecs_to_jiffies(host->clkgate_delay)); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 215 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * mmc_host_clk_rate - get current clock frequency setting |
| 220 | * @host: host to get the clock frequency for. |
| 221 | * |
| 222 | * Returns current clock frequency regardless of gating. |
| 223 | */ |
| 224 | unsigned int mmc_host_clk_rate(struct mmc_host *host) |
| 225 | { |
| 226 | unsigned long freq; |
| 227 | unsigned long flags; |
| 228 | |
| 229 | spin_lock_irqsave(&host->clk_lock, flags); |
| 230 | if (host->clk_gated) |
| 231 | freq = host->clk_old; |
| 232 | else |
| 233 | freq = host->ios.clock; |
| 234 | spin_unlock_irqrestore(&host->clk_lock, flags); |
| 235 | return freq; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * mmc_host_clk_init - set up clock gating code |
| 240 | * @host: host with potential clock to control |
| 241 | */ |
| 242 | static inline void mmc_host_clk_init(struct mmc_host *host) |
| 243 | { |
| 244 | host->clk_requests = 0; |
| 245 | /* Hold MCI clock for 8 cycles by default */ |
| 246 | host->clk_delay = 8; |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 247 | /* |
Guennadi Liakhovetski | c84f15a | 2012-02-23 11:22:29 +0100 | [diff] [blame] | 248 | * Default clock gating delay is 0ms to avoid wasting power. |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 249 | * This value can be tuned by writing into sysfs entry. |
| 250 | */ |
Guennadi Liakhovetski | c84f15a | 2012-02-23 11:22:29 +0100 | [diff] [blame] | 251 | host->clkgate_delay = 0; |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 252 | host->clk_gated = false; |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 253 | INIT_DELAYED_WORK(&host->clk_gate_work, mmc_host_clk_gate_work); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 254 | spin_lock_init(&host->clk_lock); |
Chris Ball | 86f315b | 2011-05-16 11:32:26 -0400 | [diff] [blame] | 255 | mutex_init(&host->clk_gate_mutex); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | /** |
| 259 | * mmc_host_clk_exit - shut down clock gating code |
| 260 | * @host: host with potential clock to control |
| 261 | */ |
| 262 | static inline void mmc_host_clk_exit(struct mmc_host *host) |
| 263 | { |
| 264 | /* |
| 265 | * Wait for any outstanding gate and then make sure we're |
| 266 | * ungated before exiting. |
| 267 | */ |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 268 | if (cancel_delayed_work_sync(&host->clk_gate_work)) |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 269 | mmc_host_clk_gate_delayed(host); |
| 270 | if (host->clk_gated) |
Mika Westerberg | 08c1407 | 2011-08-18 15:23:47 +0300 | [diff] [blame] | 271 | mmc_host_clk_hold(host); |
Linus Walleij | c288b85 | 2010-12-22 09:50:12 +0100 | [diff] [blame] | 272 | /* There should be only one user now */ |
| 273 | WARN_ON(host->clk_requests > 1); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 274 | } |
| 275 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 276 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
| 277 | { |
| 278 | host->clkgate_delay_attr.show = clkgate_delay_show; |
| 279 | host->clkgate_delay_attr.store = clkgate_delay_store; |
| 280 | sysfs_attr_init(&host->clkgate_delay_attr.attr); |
| 281 | host->clkgate_delay_attr.attr.name = "clkgate_delay"; |
| 282 | host->clkgate_delay_attr.attr.mode = S_IRUGO | S_IWUSR; |
| 283 | if (device_create_file(&host->class_dev, &host->clkgate_delay_attr)) |
| 284 | pr_err("%s: Failed to create clkgate_delay sysfs entry\n", |
| 285 | mmc_hostname(host)); |
| 286 | } |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 287 | #else |
| 288 | |
| 289 | static inline void mmc_host_clk_init(struct mmc_host *host) |
| 290 | { |
| 291 | } |
| 292 | |
| 293 | static inline void mmc_host_clk_exit(struct mmc_host *host) |
| 294 | { |
| 295 | } |
| 296 | |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 297 | static inline void mmc_host_clk_sysfs_init(struct mmc_host *host) |
| 298 | { |
| 299 | } |
| 300 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 301 | #endif |
| 302 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 303 | /** |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 304 | * mmc_of_parse() - parse host's device-tree node |
| 305 | * @host: host whose node should be parsed. |
| 306 | * |
| 307 | * To keep the rest of the MMC subsystem unaware of whether DT has been |
| 308 | * used to to instantiate and configure this host instance or not, we |
| 309 | * parse the properties and set respective generic mmc-host flags and |
| 310 | * parameters. |
| 311 | */ |
Simon Baatz | ec0a751 | 2013-06-09 22:14:11 +0200 | [diff] [blame] | 312 | int mmc_of_parse(struct mmc_host *host) |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 313 | { |
| 314 | struct device_node *np; |
| 315 | u32 bus_width; |
Linus Walleij | 98e90de | 2014-08-27 13:00:52 +0200 | [diff] [blame] | 316 | int len, ret; |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 317 | bool cd_cap_invert, cd_gpio_invert = false; |
| 318 | bool ro_cap_invert, ro_gpio_invert = false; |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 319 | |
| 320 | if (!host->parent || !host->parent->of_node) |
Simon Baatz | ec0a751 | 2013-06-09 22:14:11 +0200 | [diff] [blame] | 321 | return 0; |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 322 | |
| 323 | np = host->parent->of_node; |
| 324 | |
| 325 | /* "bus-width" is translated to MMC_CAP_*_BIT_DATA flags */ |
| 326 | if (of_property_read_u32(np, "bus-width", &bus_width) < 0) { |
| 327 | dev_dbg(host->parent, |
| 328 | "\"bus-width\" property is missing, assuming 1 bit.\n"); |
| 329 | bus_width = 1; |
| 330 | } |
| 331 | |
| 332 | switch (bus_width) { |
| 333 | case 8: |
| 334 | host->caps |= MMC_CAP_8_BIT_DATA; |
| 335 | /* Hosts capable of 8-bit transfers can also do 4 bits */ |
| 336 | case 4: |
| 337 | host->caps |= MMC_CAP_4_BIT_DATA; |
| 338 | break; |
| 339 | case 1: |
| 340 | break; |
| 341 | default: |
| 342 | dev_err(host->parent, |
Alexander Shiyan | 1c279f4 | 2014-02-15 15:40:58 +0400 | [diff] [blame] | 343 | "Invalid \"bus-width\" value %u!\n", bus_width); |
Simon Baatz | ec0a751 | 2013-06-09 22:14:11 +0200 | [diff] [blame] | 344 | return -EINVAL; |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 345 | } |
| 346 | |
| 347 | /* f_max is obtained from the optional "max-frequency" property */ |
| 348 | of_property_read_u32(np, "max-frequency", &host->f_max); |
| 349 | |
| 350 | /* |
| 351 | * Configure CD and WP pins. They are both by default active low to |
| 352 | * match the SDHCI spec. If GPIOs are provided for CD and / or WP, the |
| 353 | * mmc-gpio helpers are used to attach, configure and use them. If |
| 354 | * polarity inversion is specified in DT, one of MMC_CAP2_CD_ACTIVE_HIGH |
| 355 | * and MMC_CAP2_RO_ACTIVE_HIGH capability-2 flags is set. If the |
| 356 | * "broken-cd" property is provided, the MMC_CAP_NEEDS_POLL capability |
| 357 | * is set. If the "non-removable" property is found, the |
| 358 | * MMC_CAP_NONREMOVABLE capability is set and no card-detection |
| 359 | * configuration is performed. |
| 360 | */ |
| 361 | |
| 362 | /* Parse Card Detection */ |
| 363 | if (of_find_property(np, "non-removable", &len)) { |
| 364 | host->caps |= MMC_CAP_NONREMOVABLE; |
| 365 | } else { |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 366 | cd_cap_invert = of_property_read_bool(np, "cd-inverted"); |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 367 | |
| 368 | if (of_find_property(np, "broken-cd", &len)) |
| 369 | host->caps |= MMC_CAP_NEEDS_POLL; |
| 370 | |
Linus Walleij | 89168b4 | 2014-10-02 09:08:46 +0200 | [diff] [blame] | 371 | ret = mmc_gpiod_request_cd(host, "cd", 0, true, |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 372 | 0, &cd_gpio_invert); |
Ulf Hansson | 9116752 | 2014-12-18 10:41:44 +0100 | [diff] [blame] | 373 | if (!ret) |
Linus Walleij | 98e90de | 2014-08-27 13:00:52 +0200 | [diff] [blame] | 374 | dev_info(host->parent, "Got CD GPIO\n"); |
Ulf Hansson | 9116752 | 2014-12-18 10:41:44 +0100 | [diff] [blame] | 375 | else if (ret != -ENOENT) |
| 376 | return ret; |
Linus Walleij | 89168b4 | 2014-10-02 09:08:46 +0200 | [diff] [blame] | 377 | |
| 378 | /* |
| 379 | * There are two ways to flag that the CD line is inverted: |
| 380 | * through the cd-inverted flag and by the GPIO line itself |
| 381 | * being inverted from the GPIO subsystem. This is a leftover |
| 382 | * from the times when the GPIO subsystem did not make it |
| 383 | * possible to flag a line as inverted. |
| 384 | * |
| 385 | * If the capability on the host AND the GPIO line are |
| 386 | * both inverted, the end result is that the CD line is |
| 387 | * not inverted. |
| 388 | */ |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 389 | if (cd_cap_invert ^ cd_gpio_invert) |
Linus Walleij | 89168b4 | 2014-10-02 09:08:46 +0200 | [diff] [blame] | 390 | host->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | /* Parse Write Protection */ |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 394 | ro_cap_invert = of_property_read_bool(np, "wp-inverted"); |
Guennadi Liakhovetski | 2fdb6e2 | 2013-02-15 16:14:01 +0100 | [diff] [blame] | 395 | |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 396 | ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert); |
Ulf Hansson | 9116752 | 2014-12-18 10:41:44 +0100 | [diff] [blame] | 397 | if (!ret) |
Linus Walleij | 98e90de | 2014-08-27 13:00:52 +0200 | [diff] [blame] | 398 | dev_info(host->parent, "Got WP GPIO\n"); |
Ulf Hansson | 9116752 | 2014-12-18 10:41:44 +0100 | [diff] [blame] | 399 | else if (ret != -ENOENT) |
| 400 | return ret; |
Linus Walleij | 98e90de | 2014-08-27 13:00:52 +0200 | [diff] [blame] | 401 | |
Linus Walleij | 89168b4 | 2014-10-02 09:08:46 +0200 | [diff] [blame] | 402 | /* See the comment on CD inversion above */ |
Kristina Martsenko | a31b0c6 | 2014-11-05 02:22:41 +0200 | [diff] [blame] | 403 | if (ro_cap_invert ^ ro_gpio_invert) |
Linus Walleij | 89168b4 | 2014-10-02 09:08:46 +0200 | [diff] [blame] | 404 | host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; |
| 405 | |
Guennadi Liakhovetski | 2fdb6e2 | 2013-02-15 16:14:01 +0100 | [diff] [blame] | 406 | if (of_find_property(np, "cap-sd-highspeed", &len)) |
| 407 | host->caps |= MMC_CAP_SD_HIGHSPEED; |
| 408 | if (of_find_property(np, "cap-mmc-highspeed", &len)) |
| 409 | host->caps |= MMC_CAP_MMC_HIGHSPEED; |
Ulf Hansson | b66bd0e | 2014-02-14 13:27:07 +0100 | [diff] [blame] | 410 | if (of_find_property(np, "sd-uhs-sdr12", &len)) |
| 411 | host->caps |= MMC_CAP_UHS_SDR12; |
| 412 | if (of_find_property(np, "sd-uhs-sdr25", &len)) |
| 413 | host->caps |= MMC_CAP_UHS_SDR25; |
| 414 | if (of_find_property(np, "sd-uhs-sdr50", &len)) |
| 415 | host->caps |= MMC_CAP_UHS_SDR50; |
| 416 | if (of_find_property(np, "sd-uhs-sdr104", &len)) |
| 417 | host->caps |= MMC_CAP_UHS_SDR104; |
| 418 | if (of_find_property(np, "sd-uhs-ddr50", &len)) |
| 419 | host->caps |= MMC_CAP_UHS_DDR50; |
Guennadi Liakhovetski | 2fdb6e2 | 2013-02-15 16:14:01 +0100 | [diff] [blame] | 420 | if (of_find_property(np, "cap-power-off-card", &len)) |
| 421 | host->caps |= MMC_CAP_POWER_OFF_CARD; |
| 422 | if (of_find_property(np, "cap-sdio-irq", &len)) |
| 423 | host->caps |= MMC_CAP_SDIO_IRQ; |
Ulf Hansson | 5a36d6b | 2013-06-10 17:03:47 +0200 | [diff] [blame] | 424 | if (of_find_property(np, "full-pwr-cycle", &len)) |
| 425 | host->caps2 |= MMC_CAP2_FULL_PWR_CYCLE; |
Guennadi Liakhovetski | 2fdb6e2 | 2013-02-15 16:14:01 +0100 | [diff] [blame] | 426 | if (of_find_property(np, "keep-power-in-suspend", &len)) |
| 427 | host->pm_caps |= MMC_PM_KEEP_POWER; |
| 428 | if (of_find_property(np, "enable-sdio-wakeup", &len)) |
| 429 | host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ; |
Ulf Hansson | c0baf84 | 2014-02-14 13:27:08 +0100 | [diff] [blame] | 430 | if (of_find_property(np, "mmc-ddr-1_8v", &len)) |
| 431 | host->caps |= MMC_CAP_1_8V_DDR; |
| 432 | if (of_find_property(np, "mmc-ddr-1_2v", &len)) |
| 433 | host->caps |= MMC_CAP_1_2V_DDR; |
Jaehoon Chung | 321bd41 | 2014-02-14 13:27:09 +0100 | [diff] [blame] | 434 | if (of_find_property(np, "mmc-hs200-1_8v", &len)) |
| 435 | host->caps2 |= MMC_CAP2_HS200_1_8V_SDR; |
| 436 | if (of_find_property(np, "mmc-hs200-1_2v", &len)) |
| 437 | host->caps2 |= MMC_CAP2_HS200_1_2V_SDR; |
Seungwon Jeon | c373eb4 | 2014-04-23 17:15:08 +0900 | [diff] [blame] | 438 | if (of_find_property(np, "mmc-hs400-1_8v", &len)) |
| 439 | host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR; |
| 440 | if (of_find_property(np, "mmc-hs400-1_2v", &len)) |
| 441 | host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR; |
Simon Baatz | ec0a751 | 2013-06-09 22:14:11 +0200 | [diff] [blame] | 442 | |
Sascha Hauer | 3d705d1 | 2014-08-19 10:45:51 +0200 | [diff] [blame] | 443 | host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr); |
| 444 | if (host->dsr_req && (host->dsr & ~0xffff)) { |
| 445 | dev_err(host->parent, |
| 446 | "device tree specified broken value for DSR: 0x%x, ignoring\n", |
| 447 | host->dsr); |
| 448 | host->dsr_req = 0; |
| 449 | } |
| 450 | |
Simon Baatz | ec0a751 | 2013-06-09 22:14:11 +0200 | [diff] [blame] | 451 | return 0; |
Guennadi Liakhovetski | 6c56e7a | 2013-02-16 16:21:16 +0100 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | EXPORT_SYMBOL(mmc_of_parse); |
| 455 | |
| 456 | /** |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 457 | * mmc_alloc_host - initialise the per-host structure. |
| 458 | * @extra: sizeof private data structure |
| 459 | * @dev: pointer to host device model structure |
| 460 | * |
| 461 | * Initialise the per-host structure. |
| 462 | */ |
| 463 | struct mmc_host *mmc_alloc_host(int extra, struct device *dev) |
| 464 | { |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 465 | int err; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 466 | struct mmc_host *host; |
| 467 | |
Mariusz Kozlowski | be760a9 | 2007-08-10 14:00:50 -0700 | [diff] [blame] | 468 | host = kzalloc(sizeof(struct mmc_host) + extra, GFP_KERNEL); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 469 | if (!host) |
| 470 | return NULL; |
| 471 | |
Guennadi Liakhovetski | d9adcc1 | 2012-06-14 10:17:39 +0200 | [diff] [blame] | 472 | /* scanning will be enabled when we're ready */ |
| 473 | host->rescan_disable = 1; |
Tejun Heo | 803d9e0 | 2013-02-27 17:04:32 -0800 | [diff] [blame] | 474 | idr_preload(GFP_KERNEL); |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 475 | spin_lock(&mmc_host_lock); |
Tejun Heo | 803d9e0 | 2013-02-27 17:04:32 -0800 | [diff] [blame] | 476 | err = idr_alloc(&mmc_host_idr, host, 0, 0, GFP_NOWAIT); |
| 477 | if (err >= 0) |
| 478 | host->index = err; |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 479 | spin_unlock(&mmc_host_lock); |
Tejun Heo | 803d9e0 | 2013-02-27 17:04:32 -0800 | [diff] [blame] | 480 | idr_preload_end(); |
| 481 | if (err < 0) |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 482 | goto free; |
| 483 | |
Kay Sievers | d1b2686 | 2008-11-08 21:37:46 +0100 | [diff] [blame] | 484 | dev_set_name(&host->class_dev, "mmc%d", host->index); |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 485 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 486 | host->parent = dev; |
| 487 | host->class_dev.parent = dev; |
| 488 | host->class_dev.class = &mmc_host_class; |
| 489 | device_initialize(&host->class_dev); |
| 490 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 491 | mmc_host_clk_init(host); |
| 492 | |
Guennadi Liakhovetski | a7d1a1e | 2012-05-01 16:51:38 +0200 | [diff] [blame] | 493 | mutex_init(&host->slot.lock); |
Guennadi Liakhovetski | 27410ee | 2012-05-01 15:40:15 +0200 | [diff] [blame] | 494 | host->slot.cd_irq = -EINVAL; |
| 495 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 496 | spin_lock_init(&host->lock); |
| 497 | init_waitqueue_head(&host->wq); |
| 498 | INIT_DELAYED_WORK(&host->detect, mmc_rescan); |
Uwe Kleine-König | 81ca03a | 2010-08-18 09:25:38 -0700 | [diff] [blame] | 499 | #ifdef CONFIG_PM |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 500 | host->pm_notify.notifier_call = mmc_pm_notify; |
Uwe Kleine-König | 81ca03a | 2010-08-18 09:25:38 -0700 | [diff] [blame] | 501 | #endif |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 502 | |
| 503 | /* |
| 504 | * By default, hosts do not support SGIO or large requests. |
| 505 | * They have to set these according to their abilities. |
| 506 | */ |
Martin K. Petersen | a36274e | 2010-09-10 01:33:59 -0400 | [diff] [blame] | 507 | host->max_segs = 1; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 508 | host->max_seg_size = PAGE_CACHE_SIZE; |
| 509 | |
| 510 | host->max_req_size = PAGE_CACHE_SIZE; |
| 511 | host->max_blk_size = 512; |
| 512 | host->max_blk_count = PAGE_CACHE_SIZE / 512; |
| 513 | |
| 514 | return host; |
Pierre Ossman | ff3112f | 2008-03-08 23:43:19 +0100 | [diff] [blame] | 515 | |
| 516 | free: |
| 517 | kfree(host); |
| 518 | return NULL; |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 519 | } |
| 520 | |
| 521 | EXPORT_SYMBOL(mmc_alloc_host); |
| 522 | |
| 523 | /** |
| 524 | * mmc_add_host - initialise host hardware |
| 525 | * @host: mmc host |
Pierre Ossman | 67a61c4 | 2007-07-11 20:22:11 +0200 | [diff] [blame] | 526 | * |
| 527 | * Register the host with the driver model. The host must be |
| 528 | * prepared to start servicing requests before this function |
| 529 | * completes. |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 530 | */ |
| 531 | int mmc_add_host(struct mmc_host *host) |
| 532 | { |
| 533 | int err; |
| 534 | |
Nicolas Pitre | 17b759a | 2007-07-24 02:09:39 -0400 | [diff] [blame] | 535 | WARN_ON((host->caps & MMC_CAP_SDIO_IRQ) && |
| 536 | !host->ops->enable_sdio_irq); |
| 537 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 538 | err = device_add(&host->class_dev); |
| 539 | if (err) |
| 540 | return err; |
| 541 | |
Wolfram Sang | f317dfe | 2011-04-11 06:11:29 +0200 | [diff] [blame] | 542 | led_trigger_register_simple(dev_name(&host->class_dev), &host->led); |
| 543 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 544 | #ifdef CONFIG_DEBUG_FS |
| 545 | mmc_add_host_debugfs(host); |
| 546 | #endif |
Sujit Reddy Thumma | 597dd9d79 | 2011-11-14 13:53:29 +0530 | [diff] [blame] | 547 | mmc_host_clk_sysfs_init(host); |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 548 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 549 | mmc_start_host(host); |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 550 | register_pm_notifier(&host->pm_notify); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 551 | |
| 552 | return 0; |
| 553 | } |
| 554 | |
| 555 | EXPORT_SYMBOL(mmc_add_host); |
| 556 | |
| 557 | /** |
| 558 | * mmc_remove_host - remove host hardware |
| 559 | * @host: mmc host |
| 560 | * |
| 561 | * Unregister and remove all cards associated with this host, |
Pierre Ossman | 67a61c4 | 2007-07-11 20:22:11 +0200 | [diff] [blame] | 562 | * and power down the MMC bus. No new requests will be issued |
| 563 | * after this function has returned. |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 564 | */ |
| 565 | void mmc_remove_host(struct mmc_host *host) |
| 566 | { |
Maxim Levitsky | 4c2ef25 | 2010-08-10 18:01:41 -0700 | [diff] [blame] | 567 | unregister_pm_notifier(&host->pm_notify); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 568 | mmc_stop_host(host); |
| 569 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 570 | #ifdef CONFIG_DEBUG_FS |
| 571 | mmc_remove_host_debugfs(host); |
| 572 | #endif |
| 573 | |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 574 | device_del(&host->class_dev); |
| 575 | |
Pierre Ossman | 77f1fd6 | 2007-10-12 22:48:46 +0200 | [diff] [blame] | 576 | led_trigger_unregister_simple(host->led); |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 577 | |
| 578 | mmc_host_clk_exit(host); |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | EXPORT_SYMBOL(mmc_remove_host); |
| 582 | |
| 583 | /** |
| 584 | * mmc_free_host - free the host structure |
| 585 | * @host: mmc host |
| 586 | * |
| 587 | * Free the host once all references to it have been dropped. |
| 588 | */ |
| 589 | void mmc_free_host(struct mmc_host *host) |
| 590 | { |
Pierre Ossman | b93931a | 2007-05-19 14:06:24 +0200 | [diff] [blame] | 591 | put_device(&host->class_dev); |
| 592 | } |
| 593 | |
| 594 | EXPORT_SYMBOL(mmc_free_host); |