Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 1 | /* |
| 2 | * Freescale LBC and UPM routines. |
| 3 | * |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 4 | * Copyright © 2007-2008 MontaVista Software, Inc. |
| 5 | * Copyright © 2010 Freescale Semiconductor |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 6 | * |
| 7 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 8 | * Author: Jack Lan <Jack.Lan@freescale.com> |
| 9 | * Author: Roy Zang <tie-fei.zang@freescale.com> |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | */ |
| 16 | |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 17 | #include <linux/init.h> |
Paul Gortmaker | 4b16f8e | 2011-07-22 18:24:23 -0400 | [diff] [blame] | 18 | #include <linux/export.h> |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 19 | #include <linux/kernel.h> |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 20 | #include <linux/compiler.h> |
| 21 | #include <linux/spinlock.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/io.h> |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 24 | #include <linux/of.h> |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 25 | #include <linux/slab.h> |
Paul Gortmaker | 62fe91b | 2011-05-27 14:25:11 -0400 | [diff] [blame] | 26 | #include <linux/sched.h> |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 27 | #include <linux/platform_device.h> |
| 28 | #include <linux/interrupt.h> |
| 29 | #include <linux/mod_devicetable.h> |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 30 | #include <asm/prom.h> |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 31 | #include <asm/fsl_lbc.h> |
| 32 | |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 33 | static spinlock_t fsl_lbc_lock = __SPIN_LOCK_UNLOCKED(fsl_lbc_lock); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 34 | struct fsl_lbc_ctrl *fsl_lbc_ctrl_dev; |
| 35 | EXPORT_SYMBOL(fsl_lbc_ctrl_dev); |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 36 | |
| 37 | /** |
Lan Chunhe-B25806 | 0b824d2 | 2010-10-18 15:22:32 +0800 | [diff] [blame] | 38 | * fsl_lbc_addr - convert the base address |
| 39 | * @addr_base: base address of the memory bank |
| 40 | * |
| 41 | * This function converts a base address of lbc into the right format for the |
| 42 | * BR register. If the SOC has eLBC then it returns 32bit physical address |
| 43 | * else it convers a 34bit local bus physical address to correct format of |
| 44 | * 32bit address for BR register (Example: MPC8641). |
| 45 | */ |
| 46 | u32 fsl_lbc_addr(phys_addr_t addr_base) |
| 47 | { |
| 48 | struct device_node *np = fsl_lbc_ctrl_dev->dev->of_node; |
| 49 | u32 addr = addr_base & 0xffff8000; |
| 50 | |
| 51 | if (of_device_is_compatible(np, "fsl,elbc")) |
| 52 | return addr; |
| 53 | |
| 54 | return addr | ((addr_base & 0x300000000ull) >> 19); |
| 55 | } |
| 56 | EXPORT_SYMBOL(fsl_lbc_addr); |
| 57 | |
| 58 | /** |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 59 | * fsl_lbc_find - find Localbus bank |
| 60 | * @addr_base: base address of the memory bank |
| 61 | * |
| 62 | * This function walks LBC banks comparing "Base address" field of the BR |
| 63 | * registers with the supplied addr_base argument. When bases match this |
| 64 | * function returns bank number (starting with 0), otherwise it returns |
| 65 | * appropriate errno value. |
| 66 | */ |
| 67 | int fsl_lbc_find(phys_addr_t addr_base) |
| 68 | { |
| 69 | int i; |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 70 | struct fsl_lbc_regs __iomem *lbc; |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 71 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 72 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 73 | return -ENODEV; |
| 74 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 75 | lbc = fsl_lbc_ctrl_dev->regs; |
| 76 | for (i = 0; i < ARRAY_SIZE(lbc->bank); i++) { |
Kim Phillips | 01673a1 | 2012-11-30 17:35:00 -0600 | [diff] [blame] | 77 | u32 br = in_be32(&lbc->bank[i].br); |
| 78 | u32 or = in_be32(&lbc->bank[i].or); |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 79 | |
Lan Chunhe-B25806 | 0b824d2 | 2010-10-18 15:22:32 +0800 | [diff] [blame] | 80 | if (br & BR_V && (br & or & BR_BA) == fsl_lbc_addr(addr_base)) |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 81 | return i; |
| 82 | } |
| 83 | |
| 84 | return -ENOENT; |
| 85 | } |
| 86 | EXPORT_SYMBOL(fsl_lbc_find); |
| 87 | |
| 88 | /** |
| 89 | * fsl_upm_find - find pre-programmed UPM via base address |
| 90 | * @addr_base: base address of the memory bank controlled by the UPM |
| 91 | * @upm: pointer to the allocated fsl_upm structure |
| 92 | * |
| 93 | * This function fills fsl_upm structure so you can use it with the rest of |
| 94 | * UPM API. On success this function returns 0, otherwise it returns |
| 95 | * appropriate errno value. |
| 96 | */ |
| 97 | int fsl_upm_find(phys_addr_t addr_base, struct fsl_upm *upm) |
| 98 | { |
| 99 | int bank; |
Kim Phillips | 01673a1 | 2012-11-30 17:35:00 -0600 | [diff] [blame] | 100 | u32 br; |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 101 | struct fsl_lbc_regs __iomem *lbc; |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 102 | |
| 103 | bank = fsl_lbc_find(addr_base); |
| 104 | if (bank < 0) |
| 105 | return bank; |
| 106 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 107 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
| 108 | return -ENODEV; |
| 109 | |
| 110 | lbc = fsl_lbc_ctrl_dev->regs; |
| 111 | br = in_be32(&lbc->bank[bank].br); |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 112 | |
| 113 | switch (br & BR_MSEL) { |
| 114 | case BR_MS_UPMA: |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 115 | upm->mxmr = &lbc->mamr; |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 116 | break; |
| 117 | case BR_MS_UPMB: |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 118 | upm->mxmr = &lbc->mbmr; |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 119 | break; |
| 120 | case BR_MS_UPMC: |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 121 | upm->mxmr = &lbc->mcmr; |
Anton Vorontsov | acaa7aa | 2008-04-11 21:03:40 +0400 | [diff] [blame] | 122 | break; |
| 123 | default: |
| 124 | return -EINVAL; |
| 125 | } |
| 126 | |
| 127 | switch (br & BR_PS) { |
| 128 | case BR_PS_8: |
| 129 | upm->width = 8; |
| 130 | break; |
| 131 | case BR_PS_16: |
| 132 | upm->width = 16; |
| 133 | break; |
| 134 | case BR_PS_32: |
| 135 | upm->width = 32; |
| 136 | break; |
| 137 | default: |
| 138 | return -EINVAL; |
| 139 | } |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | EXPORT_SYMBOL(fsl_upm_find); |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 144 | |
| 145 | /** |
| 146 | * fsl_upm_run_pattern - actually run an UPM pattern |
| 147 | * @upm: pointer to the fsl_upm structure obtained via fsl_upm_find |
| 148 | * @io_base: remapped pointer to where memory access should happen |
| 149 | * @mar: MAR register content during pattern execution |
| 150 | * |
| 151 | * This function triggers dummy write to the memory specified by the io_base, |
| 152 | * thus UPM pattern actually executed. Note that mar usage depends on the |
| 153 | * pre-programmed AMX bits in the UPM RAM. |
| 154 | */ |
| 155 | int fsl_upm_run_pattern(struct fsl_upm *upm, void __iomem *io_base, u32 mar) |
| 156 | { |
| 157 | int ret = 0; |
| 158 | unsigned long flags; |
| 159 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 160 | if (!fsl_lbc_ctrl_dev || !fsl_lbc_ctrl_dev->regs) |
| 161 | return -ENODEV; |
| 162 | |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 163 | spin_lock_irqsave(&fsl_lbc_lock, flags); |
| 164 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 165 | out_be32(&fsl_lbc_ctrl_dev->regs->mar, mar); |
Anton Vorontsov | c0da99d | 2008-10-09 04:32:59 +0400 | [diff] [blame] | 166 | |
| 167 | switch (upm->width) { |
| 168 | case 8: |
| 169 | out_8(io_base, 0x0); |
| 170 | break; |
| 171 | case 16: |
| 172 | out_be16(io_base, 0x0); |
| 173 | break; |
| 174 | case 32: |
| 175 | out_be32(io_base, 0x0); |
| 176 | break; |
| 177 | default: |
| 178 | ret = -EINVAL; |
| 179 | break; |
| 180 | } |
| 181 | |
| 182 | spin_unlock_irqrestore(&fsl_lbc_lock, flags); |
| 183 | |
| 184 | return ret; |
| 185 | } |
| 186 | EXPORT_SYMBOL(fsl_upm_run_pattern); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 187 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 188 | static int fsl_lbc_ctrl_init(struct fsl_lbc_ctrl *ctrl, |
| 189 | struct device_node *node) |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 190 | { |
| 191 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; |
| 192 | |
| 193 | /* clear event registers */ |
| 194 | setbits32(&lbc->ltesr, LTESR_CLEAR); |
| 195 | out_be32(&lbc->lteatr, 0); |
| 196 | out_be32(&lbc->ltear, 0); |
| 197 | out_be32(&lbc->lteccr, LTECCR_CLEAR); |
| 198 | out_be32(&lbc->ltedr, LTEDR_ENABLE); |
| 199 | |
Shengzhou Liu | d08e445 | 2011-05-19 18:48:01 +0800 | [diff] [blame] | 200 | /* Set the monitor timeout value to the maximum for erratum A001 */ |
| 201 | if (of_device_is_compatible(node, "fsl,elbc")) |
| 202 | clrsetbits_be32(&lbc->lbcr, LBCR_BMT, LBCR_BMTPS); |
| 203 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * NOTE: This interrupt is used to report localbus events of various kinds, |
| 209 | * such as transaction errors on the chipselects. |
| 210 | */ |
| 211 | |
| 212 | static irqreturn_t fsl_lbc_ctrl_irq(int irqno, void *data) |
| 213 | { |
| 214 | struct fsl_lbc_ctrl *ctrl = data; |
| 215 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; |
| 216 | u32 status; |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 217 | unsigned long flags; |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 218 | |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 219 | spin_lock_irqsave(&fsl_lbc_lock, flags); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 220 | status = in_be32(&lbc->ltesr); |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 221 | if (!status) { |
| 222 | spin_unlock_irqrestore(&fsl_lbc_lock, flags); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 223 | return IRQ_NONE; |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 224 | } |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 225 | |
| 226 | out_be32(&lbc->ltesr, LTESR_CLEAR); |
| 227 | out_be32(&lbc->lteatr, 0); |
| 228 | out_be32(&lbc->ltear, 0); |
| 229 | ctrl->irq_status = status; |
| 230 | |
| 231 | if (status & LTESR_BM) |
| 232 | dev_err(ctrl->dev, "Local bus monitor time-out: " |
| 233 | "LTESR 0x%08X\n", status); |
| 234 | if (status & LTESR_WP) |
| 235 | dev_err(ctrl->dev, "Write protect error: " |
| 236 | "LTESR 0x%08X\n", status); |
| 237 | if (status & LTESR_ATMW) |
| 238 | dev_err(ctrl->dev, "Atomic write error: " |
| 239 | "LTESR 0x%08X\n", status); |
| 240 | if (status & LTESR_ATMR) |
| 241 | dev_err(ctrl->dev, "Atomic read error: " |
| 242 | "LTESR 0x%08X\n", status); |
| 243 | if (status & LTESR_CS) |
| 244 | dev_err(ctrl->dev, "Chip select error: " |
| 245 | "LTESR 0x%08X\n", status); |
| 246 | if (status & LTESR_UPM) |
| 247 | ; |
| 248 | if (status & LTESR_FCT) { |
| 249 | dev_err(ctrl->dev, "FCM command time-out: " |
| 250 | "LTESR 0x%08X\n", status); |
| 251 | smp_wmb(); |
| 252 | wake_up(&ctrl->irq_wait); |
| 253 | } |
| 254 | if (status & LTESR_PAR) { |
| 255 | dev_err(ctrl->dev, "Parity or Uncorrectable ECC error: " |
| 256 | "LTESR 0x%08X\n", status); |
| 257 | smp_wmb(); |
| 258 | wake_up(&ctrl->irq_wait); |
| 259 | } |
| 260 | if (status & LTESR_CC) { |
| 261 | smp_wmb(); |
| 262 | wake_up(&ctrl->irq_wait); |
| 263 | } |
| 264 | if (status & ~LTESR_MASK) |
| 265 | dev_err(ctrl->dev, "Unknown error: " |
| 266 | "LTESR 0x%08X\n", status); |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 267 | spin_unlock_irqrestore(&fsl_lbc_lock, flags); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 268 | return IRQ_HANDLED; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * fsl_lbc_ctrl_probe |
| 273 | * |
| 274 | * called by device layer when it finds a device matching |
| 275 | * one our driver can handled. This code allocates all of |
| 276 | * the resources needed for the controller only. The |
| 277 | * resources for the NAND banks themselves are allocated |
| 278 | * in the chip probe function. |
| 279 | */ |
| 280 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 281 | static int fsl_lbc_ctrl_probe(struct platform_device *dev) |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 282 | { |
| 283 | int ret; |
| 284 | |
| 285 | if (!dev->dev.of_node) { |
| 286 | dev_err(&dev->dev, "Device OF-Node is NULL"); |
| 287 | return -EFAULT; |
| 288 | } |
| 289 | |
| 290 | fsl_lbc_ctrl_dev = kzalloc(sizeof(*fsl_lbc_ctrl_dev), GFP_KERNEL); |
| 291 | if (!fsl_lbc_ctrl_dev) |
| 292 | return -ENOMEM; |
| 293 | |
| 294 | dev_set_drvdata(&dev->dev, fsl_lbc_ctrl_dev); |
| 295 | |
| 296 | spin_lock_init(&fsl_lbc_ctrl_dev->lock); |
| 297 | init_waitqueue_head(&fsl_lbc_ctrl_dev->irq_wait); |
| 298 | |
| 299 | fsl_lbc_ctrl_dev->regs = of_iomap(dev->dev.of_node, 0); |
| 300 | if (!fsl_lbc_ctrl_dev->regs) { |
| 301 | dev_err(&dev->dev, "failed to get memory region\n"); |
| 302 | ret = -ENODEV; |
| 303 | goto err; |
| 304 | } |
| 305 | |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 306 | fsl_lbc_ctrl_dev->irq[0] = irq_of_parse_and_map(dev->dev.of_node, 0); |
| 307 | if (!fsl_lbc_ctrl_dev->irq[0]) { |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 308 | dev_err(&dev->dev, "failed to get irq resource\n"); |
| 309 | ret = -ENODEV; |
| 310 | goto err; |
| 311 | } |
| 312 | |
| 313 | fsl_lbc_ctrl_dev->dev = &dev->dev; |
| 314 | |
Shengzhou Liu | d08e445 | 2011-05-19 18:48:01 +0800 | [diff] [blame] | 315 | ret = fsl_lbc_ctrl_init(fsl_lbc_ctrl_dev, dev->dev.of_node); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 316 | if (ret < 0) |
| 317 | goto err; |
| 318 | |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 319 | ret = request_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_irq, 0, |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 320 | "fsl-lbc", fsl_lbc_ctrl_dev); |
| 321 | if (ret != 0) { |
| 322 | dev_err(&dev->dev, "failed to install irq (%d)\n", |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 323 | fsl_lbc_ctrl_dev->irq[0]); |
| 324 | ret = fsl_lbc_ctrl_dev->irq[0]; |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 325 | goto err; |
| 326 | } |
| 327 | |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 328 | fsl_lbc_ctrl_dev->irq[1] = irq_of_parse_and_map(dev->dev.of_node, 1); |
| 329 | if (fsl_lbc_ctrl_dev->irq[1]) { |
| 330 | ret = request_irq(fsl_lbc_ctrl_dev->irq[1], fsl_lbc_ctrl_irq, |
| 331 | IRQF_SHARED, "fsl-lbc-err", fsl_lbc_ctrl_dev); |
| 332 | if (ret) { |
| 333 | dev_err(&dev->dev, "failed to install irq (%d)\n", |
| 334 | fsl_lbc_ctrl_dev->irq[1]); |
| 335 | ret = fsl_lbc_ctrl_dev->irq[1]; |
| 336 | goto err1; |
| 337 | } |
| 338 | } |
| 339 | |
Shaohui Xie | 704102a6 | 2011-06-03 10:45:11 +0800 | [diff] [blame] | 340 | /* Enable interrupts for any detected events */ |
| 341 | out_be32(&fsl_lbc_ctrl_dev->regs->lteir, LTEIR_ENABLE); |
| 342 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 343 | return 0; |
| 344 | |
Shaohui Xie | a655f72 | 2014-01-07 14:27:41 +0800 | [diff] [blame^] | 345 | err1: |
| 346 | free_irq(fsl_lbc_ctrl_dev->irq[0], fsl_lbc_ctrl_dev); |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 347 | err: |
| 348 | iounmap(fsl_lbc_ctrl_dev->regs); |
| 349 | kfree(fsl_lbc_ctrl_dev); |
Alexandre Rusev | 7145cf1 | 2011-10-27 18:18:37 +0400 | [diff] [blame] | 350 | fsl_lbc_ctrl_dev = NULL; |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 351 | return ret; |
| 352 | } |
| 353 | |
Jia Hongtao | 09cef8b | 2011-11-21 14:29:11 +0800 | [diff] [blame] | 354 | #ifdef CONFIG_SUSPEND |
| 355 | |
| 356 | /* save lbc registers */ |
| 357 | static int fsl_lbc_suspend(struct platform_device *pdev, pm_message_t state) |
| 358 | { |
| 359 | struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev); |
| 360 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; |
| 361 | |
| 362 | ctrl->saved_regs = kmalloc(sizeof(struct fsl_lbc_regs), GFP_KERNEL); |
| 363 | if (!ctrl->saved_regs) |
| 364 | return -ENOMEM; |
| 365 | |
| 366 | _memcpy_fromio(ctrl->saved_regs, lbc, sizeof(struct fsl_lbc_regs)); |
| 367 | return 0; |
| 368 | } |
| 369 | |
| 370 | /* restore lbc registers */ |
| 371 | static int fsl_lbc_resume(struct platform_device *pdev) |
| 372 | { |
| 373 | struct fsl_lbc_ctrl *ctrl = dev_get_drvdata(&pdev->dev); |
| 374 | struct fsl_lbc_regs __iomem *lbc = ctrl->regs; |
| 375 | |
| 376 | if (ctrl->saved_regs) { |
| 377 | _memcpy_toio(lbc, ctrl->saved_regs, |
| 378 | sizeof(struct fsl_lbc_regs)); |
| 379 | kfree(ctrl->saved_regs); |
| 380 | ctrl->saved_regs = NULL; |
| 381 | } |
| 382 | return 0; |
| 383 | } |
| 384 | #endif /* CONFIG_SUSPEND */ |
| 385 | |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 386 | static const struct of_device_id fsl_lbc_match[] = { |
| 387 | { .compatible = "fsl,elbc", }, |
| 388 | { .compatible = "fsl,pq3-localbus", }, |
| 389 | { .compatible = "fsl,pq2-localbus", }, |
| 390 | { .compatible = "fsl,pq2pro-localbus", }, |
| 391 | {}, |
| 392 | }; |
| 393 | |
| 394 | static struct platform_driver fsl_lbc_ctrl_driver = { |
| 395 | .driver = { |
| 396 | .name = "fsl-lbc", |
| 397 | .of_match_table = fsl_lbc_match, |
| 398 | }, |
| 399 | .probe = fsl_lbc_ctrl_probe, |
Jia Hongtao | 09cef8b | 2011-11-21 14:29:11 +0800 | [diff] [blame] | 400 | #ifdef CONFIG_SUSPEND |
| 401 | .suspend = fsl_lbc_suspend, |
| 402 | .resume = fsl_lbc_resume, |
| 403 | #endif |
Roy Zang | 3ab8f2a | 2010-10-18 15:22:31 +0800 | [diff] [blame] | 404 | }; |
| 405 | |
| 406 | static int __init fsl_lbc_init(void) |
| 407 | { |
| 408 | return platform_driver_register(&fsl_lbc_ctrl_driver); |
| 409 | } |
| 410 | module_init(fsl_lbc_init); |