1/* 2 * 3 * Toshiba T7L66XB core mfd support 4 * 5 * Copyright (c) 2005, 2007, 2008 Ian Molton 6 * Copyright (c) 2008 Dmitry Baryshkov 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 * T7L66 features: 13 * 14 * Supported in this driver: 15 * SD/MMC 16 * SM/NAND flash controller 17 * 18 * As yet not supported 19 * GPIO interface (on NAND pins) 20 * Serial interface 21 * TFT 'interface converter' 22 * PCMCIA interface logic 23 */ 24 25#include <linux/kernel.h> 26#include <linux/module.h> 27#include <linux/err.h> 28#include <linux/io.h> 29#include <linux/slab.h> 30#include <linux/irq.h> 31#include <linux/clk.h> 32#include <linux/platform_device.h> 33#include <linux/mfd/core.h> 34#include <linux/mfd/tmio.h> 35#include <linux/mfd/t7l66xb.h> 36 37enum { 38 T7L66XB_CELL_NAND, 39 T7L66XB_CELL_MMC, 40}; 41 42static const struct resource t7l66xb_mmc_resources[] = { 43 { 44 .start = 0x800, 45 .end = 0x9ff, 46 .flags = IORESOURCE_MEM, 47 }, 48 { 49 .start = IRQ_T7L66XB_MMC, 50 .end = IRQ_T7L66XB_MMC, 51 .flags = IORESOURCE_IRQ, 52 }, 53}; 54 55#define SCR_REVID 0x08 /* b Revision ID */ 56#define SCR_IMR 0x42 /* b Interrupt Mask */ 57#define SCR_DEV_CTL 0xe0 /* b Device control */ 58#define SCR_ISR 0xe1 /* b Interrupt Status */ 59#define SCR_GPO_OC 0xf0 /* b GPO output control */ 60#define SCR_GPO_OS 0xf1 /* b GPO output enable */ 61#define SCR_GPI_S 0xf2 /* w GPI status */ 62#define SCR_APDC 0xf8 /* b Active pullup down ctrl */ 63 64#define SCR_DEV_CTL_USB BIT(0) /* USB enable */ 65#define SCR_DEV_CTL_MMC BIT(1) /* MMC enable */ 66 67/*--------------------------------------------------------------------------*/ 68 69struct t7l66xb { 70 void __iomem *scr; 71 /* Lock to protect registers requiring read/modify/write ops. */ 72 spinlock_t lock; 73 74 struct resource rscr; 75 struct clk *clk48m; 76 struct clk *clk32k; 77 int irq; 78 int irq_base; 79}; 80 81/*--------------------------------------------------------------------------*/ 82 83static int t7l66xb_mmc_enable(struct platform_device *mmc) 84{ 85 struct platform_device *dev = to_platform_device(mmc->dev.parent); 86 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 87 unsigned long flags; 88 u8 dev_ctl; 89 90 clk_enable(t7l66xb->clk32k); 91 92 spin_lock_irqsave(&t7l66xb->lock, flags); 93 94 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL); 95 dev_ctl |= SCR_DEV_CTL_MMC; 96 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL); 97 98 spin_unlock_irqrestore(&t7l66xb->lock, flags); 99 100 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0, 101 t7l66xb_mmc_resources[0].start & 0xfffe); 102 103 return 0; 104} 105 106static int t7l66xb_mmc_disable(struct platform_device *mmc) 107{ 108 struct platform_device *dev = to_platform_device(mmc->dev.parent); 109 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 110 unsigned long flags; 111 u8 dev_ctl; 112 113 spin_lock_irqsave(&t7l66xb->lock, flags); 114 115 dev_ctl = tmio_ioread8(t7l66xb->scr + SCR_DEV_CTL); 116 dev_ctl &= ~SCR_DEV_CTL_MMC; 117 tmio_iowrite8(dev_ctl, t7l66xb->scr + SCR_DEV_CTL); 118 119 spin_unlock_irqrestore(&t7l66xb->lock, flags); 120 121 clk_disable(t7l66xb->clk32k); 122 123 return 0; 124} 125 126static void t7l66xb_mmc_pwr(struct platform_device *mmc, int state) 127{ 128 struct platform_device *dev = to_platform_device(mmc->dev.parent); 129 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 130 131 tmio_core_mmc_pwr(t7l66xb->scr + 0x200, 0, state); 132} 133 134static void t7l66xb_mmc_clk_div(struct platform_device *mmc, int state) 135{ 136 struct platform_device *dev = to_platform_device(mmc->dev.parent); 137 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 138 139 tmio_core_mmc_clk_div(t7l66xb->scr + 0x200, 0, state); 140} 141 142/*--------------------------------------------------------------------------*/ 143 144static struct tmio_mmc_data t7166xb_mmc_data = { 145 .hclk = 24000000, 146 .set_pwr = t7l66xb_mmc_pwr, 147 .set_clk_div = t7l66xb_mmc_clk_div, 148}; 149 150static const struct resource t7l66xb_nand_resources[] = { 151 { 152 .start = 0xc00, 153 .end = 0xc07, 154 .flags = IORESOURCE_MEM, 155 }, 156 { 157 .start = 0x0100, 158 .end = 0x01ff, 159 .flags = IORESOURCE_MEM, 160 }, 161 { 162 .start = IRQ_T7L66XB_NAND, 163 .end = IRQ_T7L66XB_NAND, 164 .flags = IORESOURCE_IRQ, 165 }, 166}; 167 168static struct mfd_cell t7l66xb_cells[] = { 169 [T7L66XB_CELL_MMC] = { 170 .name = "tmio-mmc", 171 .enable = t7l66xb_mmc_enable, 172 .disable = t7l66xb_mmc_disable, 173 .driver_data = &t7166xb_mmc_data, 174 .num_resources = ARRAY_SIZE(t7l66xb_mmc_resources), 175 .resources = t7l66xb_mmc_resources, 176 }, 177 [T7L66XB_CELL_NAND] = { 178 .name = "tmio-nand", 179 .num_resources = ARRAY_SIZE(t7l66xb_nand_resources), 180 .resources = t7l66xb_nand_resources, 181 }, 182}; 183 184/*--------------------------------------------------------------------------*/ 185 186/* Handle the T7L66XB interrupt mux */ 187static void t7l66xb_irq(unsigned int irq, struct irq_desc *desc) 188{ 189 struct t7l66xb *t7l66xb = get_irq_data(irq); 190 unsigned int isr; 191 unsigned int i, irq_base; 192 193 irq_base = t7l66xb->irq_base; 194 195 while ((isr = tmio_ioread8(t7l66xb->scr + SCR_ISR) & 196 ~tmio_ioread8(t7l66xb->scr + SCR_IMR))) 197 for (i = 0; i < T7L66XB_NR_IRQS; i++) 198 if (isr & (1 << i)) 199 generic_handle_irq(irq_base + i); 200} 201 202static void t7l66xb_irq_mask(unsigned int irq) 203{ 204 struct t7l66xb *t7l66xb = get_irq_chip_data(irq); 205 unsigned long flags; 206 u8 imr; 207 208 spin_lock_irqsave(&t7l66xb->lock, flags); 209 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR); 210 imr |= 1 << (irq - t7l66xb->irq_base); 211 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR); 212 spin_unlock_irqrestore(&t7l66xb->lock, flags); 213} 214 215static void t7l66xb_irq_unmask(unsigned int irq) 216{ 217 struct t7l66xb *t7l66xb = get_irq_chip_data(irq); 218 unsigned long flags; 219 u8 imr; 220 221 spin_lock_irqsave(&t7l66xb->lock, flags); 222 imr = tmio_ioread8(t7l66xb->scr + SCR_IMR); 223 imr &= ~(1 << (irq - t7l66xb->irq_base)); 224 tmio_iowrite8(imr, t7l66xb->scr + SCR_IMR); 225 spin_unlock_irqrestore(&t7l66xb->lock, flags); 226} 227 228static struct irq_chip t7l66xb_chip = { 229 .name = "t7l66xb", 230 .ack = t7l66xb_irq_mask, 231 .mask = t7l66xb_irq_mask, 232 .unmask = t7l66xb_irq_unmask, 233}; 234 235/*--------------------------------------------------------------------------*/ 236 237/* Install the IRQ handler */ 238static void t7l66xb_attach_irq(struct platform_device *dev) 239{ 240 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 241 unsigned int irq, irq_base; 242 243 irq_base = t7l66xb->irq_base; 244 245 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) { 246 set_irq_chip(irq, &t7l66xb_chip); 247 set_irq_chip_data(irq, t7l66xb); 248 set_irq_handler(irq, handle_level_irq); 249#ifdef CONFIG_ARM 250 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); 251#endif 252 } 253 254 set_irq_type(t7l66xb->irq, IRQ_TYPE_EDGE_FALLING); 255 set_irq_data(t7l66xb->irq, t7l66xb); 256 set_irq_chained_handler(t7l66xb->irq, t7l66xb_irq); 257} 258 259static void t7l66xb_detach_irq(struct platform_device *dev) 260{ 261 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 262 unsigned int irq, irq_base; 263 264 irq_base = t7l66xb->irq_base; 265 266 set_irq_chained_handler(t7l66xb->irq, NULL); 267 set_irq_data(t7l66xb->irq, NULL); 268 269 for (irq = irq_base; irq < irq_base + T7L66XB_NR_IRQS; irq++) { 270#ifdef CONFIG_ARM 271 set_irq_flags(irq, 0); 272#endif 273 set_irq_chip(irq, NULL); 274 set_irq_chip_data(irq, NULL); 275 } 276} 277 278/*--------------------------------------------------------------------------*/ 279 280#ifdef CONFIG_PM 281static int t7l66xb_suspend(struct platform_device *dev, pm_message_t state) 282{ 283 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 284 struct t7l66xb_platform_data *pdata = dev->dev.platform_data; 285 286 if (pdata && pdata->suspend) 287 pdata->suspend(dev); 288 clk_disable(t7l66xb->clk48m); 289 290 return 0; 291} 292 293static int t7l66xb_resume(struct platform_device *dev) 294{ 295 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 296 struct t7l66xb_platform_data *pdata = dev->dev.platform_data; 297 298 clk_enable(t7l66xb->clk48m); 299 if (pdata && pdata->resume) 300 pdata->resume(dev); 301 302 tmio_core_mmc_enable(t7l66xb->scr + 0x200, 0, 303 t7l66xb_mmc_resources[0].start & 0xfffe); 304 305 return 0; 306} 307#else 308#define t7l66xb_suspend NULL 309#define t7l66xb_resume NULL 310#endif 311 312/*--------------------------------------------------------------------------*/ 313 314static int t7l66xb_probe(struct platform_device *dev) 315{ 316 struct t7l66xb_platform_data *pdata = dev->dev.platform_data; 317 struct t7l66xb *t7l66xb; 318 struct resource *iomem, *rscr; 319 int ret; 320 321 if (pdata == NULL) 322 return -EINVAL; 323 324 iomem = platform_get_resource(dev, IORESOURCE_MEM, 0); 325 if (!iomem) 326 return -EINVAL; 327 328 t7l66xb = kzalloc(sizeof *t7l66xb, GFP_KERNEL); 329 if (!t7l66xb) 330 return -ENOMEM; 331 332 spin_lock_init(&t7l66xb->lock); 333 334 platform_set_drvdata(dev, t7l66xb); 335 336 ret = platform_get_irq(dev, 0); 337 if (ret >= 0) 338 t7l66xb->irq = ret; 339 else 340 goto err_noirq; 341 342 t7l66xb->irq_base = pdata->irq_base; 343 344 t7l66xb->clk32k = clk_get(&dev->dev, "CLK_CK32K"); 345 if (IS_ERR(t7l66xb->clk32k)) { 346 ret = PTR_ERR(t7l66xb->clk32k); 347 goto err_clk32k_get; 348 } 349 350 t7l66xb->clk48m = clk_get(&dev->dev, "CLK_CK48M"); 351 if (IS_ERR(t7l66xb->clk48m)) { 352 ret = PTR_ERR(t7l66xb->clk48m); 353 goto err_clk48m_get; 354 } 355 356 rscr = &t7l66xb->rscr; 357 rscr->name = "t7l66xb-core"; 358 rscr->start = iomem->start; 359 rscr->end = iomem->start + 0xff; 360 rscr->flags = IORESOURCE_MEM; 361 362 ret = request_resource(iomem, rscr); 363 if (ret) 364 goto err_request_scr; 365 366 t7l66xb->scr = ioremap(rscr->start, resource_size(rscr)); 367 if (!t7l66xb->scr) { 368 ret = -ENOMEM; 369 goto err_ioremap; 370 } 371 372 clk_enable(t7l66xb->clk48m); 373 374 if (pdata && pdata->enable) 375 pdata->enable(dev); 376 377 /* Mask all interrupts */ 378 tmio_iowrite8(0xbf, t7l66xb->scr + SCR_IMR); 379 380 printk(KERN_INFO "%s rev %d @ 0x%08lx, irq %d\n", 381 dev->name, tmio_ioread8(t7l66xb->scr + SCR_REVID), 382 (unsigned long)iomem->start, t7l66xb->irq); 383 384 t7l66xb_attach_irq(dev); 385 386 t7l66xb_cells[T7L66XB_CELL_NAND].driver_data = pdata->nand_data; 387 t7l66xb_cells[T7L66XB_CELL_NAND].platform_data = 388 &t7l66xb_cells[T7L66XB_CELL_NAND]; 389 t7l66xb_cells[T7L66XB_CELL_NAND].data_size = 390 sizeof(t7l66xb_cells[T7L66XB_CELL_NAND]); 391 392 t7l66xb_cells[T7L66XB_CELL_MMC].platform_data = 393 &t7l66xb_cells[T7L66XB_CELL_MMC]; 394 t7l66xb_cells[T7L66XB_CELL_MMC].data_size = 395 sizeof(t7l66xb_cells[T7L66XB_CELL_MMC]); 396 397 ret = mfd_add_devices(&dev->dev, dev->id, 398 t7l66xb_cells, ARRAY_SIZE(t7l66xb_cells), 399 iomem, t7l66xb->irq_base); 400 401 if (!ret) 402 return 0; 403 404 t7l66xb_detach_irq(dev); 405 iounmap(t7l66xb->scr); 406err_ioremap: 407 release_resource(&t7l66xb->rscr); 408err_request_scr: 409 clk_put(t7l66xb->clk48m); 410err_clk48m_get: 411 clk_put(t7l66xb->clk32k); 412err_clk32k_get: 413err_noirq: 414 kfree(t7l66xb); 415 return ret; 416} 417 418static int t7l66xb_remove(struct platform_device *dev) 419{ 420 struct t7l66xb_platform_data *pdata = dev->dev.platform_data; 421 struct t7l66xb *t7l66xb = platform_get_drvdata(dev); 422 int ret; 423 424 ret = pdata->disable(dev); 425 clk_disable(t7l66xb->clk48m); 426 clk_put(t7l66xb->clk48m); 427 clk_disable(t7l66xb->clk32k); 428 clk_put(t7l66xb->clk32k); 429 t7l66xb_detach_irq(dev); 430 iounmap(t7l66xb->scr); 431 release_resource(&t7l66xb->rscr); 432 mfd_remove_devices(&dev->dev); 433 platform_set_drvdata(dev, NULL); 434 kfree(t7l66xb); 435 436 return ret; 437 438} 439 440static struct platform_driver t7l66xb_platform_driver = { 441 .driver = { 442 .name = "t7l66xb", 443 .owner = THIS_MODULE, 444 }, 445 .suspend = t7l66xb_suspend, 446 .resume = t7l66xb_resume, 447 .probe = t7l66xb_probe, 448 .remove = t7l66xb_remove, 449}; 450 451/*--------------------------------------------------------------------------*/ 452 453static int __init t7l66xb_init(void) 454{ 455 int retval = 0; 456 457 retval = platform_driver_register(&t7l66xb_platform_driver); 458 return retval; 459} 460 461static void __exit t7l66xb_exit(void) 462{ 463 platform_driver_unregister(&t7l66xb_platform_driver); 464} 465 466module_init(t7l66xb_init); 467module_exit(t7l66xb_exit); 468 469MODULE_DESCRIPTION("Toshiba T7L66XB core driver"); 470MODULE_LICENSE("GPL v2"); 471MODULE_AUTHOR("Ian Molton"); 472MODULE_ALIAS("platform:t7l66xb"); 473