drivers/ide/arm/palm_bk3710.c

   1 /*
   2  * Palmchip bk3710 IDE controller
   3  *
   4  * Copyright (C) 2006 Texas Instruments.
   5  * Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
   6  *
   7  * ----------------------------------------------------------------------------
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  * ----------------------------------------------------------------------------
  23  *
  24  */
  25
  26 #include <linux/types.h>
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/ioport.h>
  30 #include <linux/hdreg.h>
  31 #include <linux/ide.h>
  32 #include <linux/delay.h>
  33 #include <linux/init.h>
  34 #include <linux/clk.h>
  35 #include <linux/platform_device.h>
  36
  37 /* Offset of the primary interface registers */
  38 #define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0
  39
  40 /* Primary Control Offset */
  41 #define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6
  42
  43 /*
  44  * PalmChip 3710 IDE Controller UDMA timing structure Definition
  45  */
  46 struct palm_bk3710_udmatiming {
  47         unsigned int rptime;    /* Ready to pause time  */
  48         unsigned int cycletime; /* Cycle Time           */
  49 };
  50
  51 #define BK3710_BMICP            0x00
  52 #define BK3710_BMISP            0x02
  53 #define BK3710_BMIDTP           0x04
  54 #define BK3710_BMICS            0x08
  55 #define BK3710_BMISS            0x0A
  56 #define BK3710_BMIDTS           0x0C
  57 #define BK3710_IDETIMP          0x40
  58 #define BK3710_IDETIMS          0x42
  59 #define BK3710_SIDETIM          0x44
  60 #define BK3710_SLEWCTL          0x45
  61 #define BK3710_IDESTATUS        0x47
  62 #define BK3710_UDMACTL          0x48
  63 #define BK3710_UDMATIM          0x4A
  64 #define BK3710_MISCCTL          0x50
  65 #define BK3710_REGSTB           0x54
  66 #define BK3710_REGRCVR          0x58
  67 #define BK3710_DATSTB           0x5C
  68 #define BK3710_DATRCVR          0x60
  69 #define BK3710_DMASTB           0x64
  70 #define BK3710_DMARCVR          0x68
  71 #define BK3710_UDMASTB          0x6C
  72 #define BK3710_UDMATRP          0x70
  73 #define BK3710_UDMAENV          0x74
  74 #define BK3710_IORDYTMP         0x78
  75 #define BK3710_IORDYTMS         0x7C
  76
  77 #include "../ide-timing.h"
  78
  79 static long ide_palm_clk;
  80
  81 static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
  82         {160, 240},             /* UDMA Mode 0 */
  83         {125, 160},             /* UDMA Mode 1 */
  84         {100, 120},             /* UDMA Mode 2 */
  85         {100, 90},              /* UDMA Mode 3 */
  86         {85,  60},              /* UDMA Mode 4 */
  87 };
  88
  89 static struct clk *ideclkp;
  90
  91 static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
  92                                     unsigned int mode)
  93 {
  94         u8 tenv, trp, t0;
  95         u32 val32;
  96         u16 val16;
  97
  98         /* DMA Data Setup */
  99         t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
 100                           ide_palm_clk) - 1;
 101         tenv = DIV_ROUND_UP(20, ide_palm_clk) - 1;
 102         trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
 103                            ide_palm_clk) - 1;
 104
 105         /* udmatim Register */
 106         val16 = readw(base + BK3710_UDMATIM) & (dev ? 0xFF0F : 0xFFF0);
 107         val16 |= (mode << (dev ? 4 : 0));
 108         writew(val16, base + BK3710_UDMATIM);
 109
 110         /* udmastb Ultra DMA Access Strobe Width */
 111         val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
 112         val32 |= (t0 << (dev ? 8 : 0));
 113         writel(val32, base + BK3710_UDMASTB);
 114
 115         /* udmatrp Ultra DMA Ready to Pause Time */
 116         val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
 117         val32 |= (trp << (dev ? 8 : 0));
 118         writel(val32, base + BK3710_UDMATRP);
 119
 120         /* udmaenv Ultra DMA envelop Time */
 121         val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
 122         val32 |= (tenv << (dev ? 8 : 0));
 123         writel(val32, base + BK3710_UDMAENV);
 124
 125         /* Enable UDMA for Device */
 126         val16 = readw(base + BK3710_UDMACTL) | (1 << dev);
 127         writew(val16, base + BK3710_UDMACTL);
 128 }
 129
 130 static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
 131                                    unsigned short min_cycle,
 132                                    unsigned int mode)
 133 {
 134         u8 td, tkw, t0;
 135         u32 val32;
 136         u16 val16;
 137         struct ide_timing *t;
 138         int cycletime;
 139
 140         t = ide_timing_find_mode(mode);
 141         cycletime = max_t(int, t->cycle, min_cycle);
 142
 143         /* DMA Data Setup */
 144         t0 = DIV_ROUND_UP(cycletime, ide_palm_clk);
 145         td = DIV_ROUND_UP(t->active, ide_palm_clk);
 146         tkw = t0 - td - 1;
 147         td -= 1;
 148
 149         val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
 150         val32 |= (td << (dev ? 8 : 0));
 151         writel(val32, base + BK3710_DMASTB);
 152
 153         val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
 154         val32 |= (tkw << (dev ? 8 : 0));
 155         writel(val32, base + BK3710_DMARCVR);
 156
 157         /* Disable UDMA for Device */
 158         val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
 159         writew(val16, base + BK3710_UDMACTL);
 160 }
 161
 162 static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
 163                                    unsigned int dev, unsigned int cycletime,
 164                                    unsigned int mode)
 165 {
 166         u8 t2, t2i, t0;
 167         u32 val32;
 168         struct ide_timing *t;
 169
 170         /* PIO Data Setup */
 171         t0 = DIV_ROUND_UP(cycletime, ide_palm_clk);
 172         t2 = DIV_ROUND_UP(ide_timing_find_mode(XFER_PIO_0 + mode)->active,
 173                           ide_palm_clk);
 174
 175         t2i = t0 - t2 - 1;
 176         t2 -= 1;
 177
 178         val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
 179         val32 |= (t2 << (dev ? 8 : 0));
 180         writel(val32, base + BK3710_DATSTB);
 181
 182         val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
 183         val32 |= (t2i << (dev ? 8 : 0));
 184         writel(val32, base + BK3710_DATRCVR);
 185
 186         if (mate && mate->present) {
 187                 u8 mode2 = ide_get_best_pio_mode(mate, 255, 4);
 188
 189                 if (mode2 < mode)
 190                         mode = mode2;
 191         }
 192
 193         /* TASKFILE Setup */
 194         t = ide_timing_find_mode(XFER_PIO_0 + mode);
 195         t0 = DIV_ROUND_UP(t->cyc8b, ide_palm_clk);
 196         t2 = DIV_ROUND_UP(t->act8b, ide_palm_clk);
 197
 198         t2i = t0 - t2 - 1;
 199         t2 -= 1;
 200
 201         val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
 202         val32 |= (t2 << (dev ? 8 : 0));
 203         writel(val32, base + BK3710_REGSTB);
 204
 205         val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
 206         val32 |= (t2i << (dev ? 8 : 0));
 207         writel(val32, base + BK3710_REGRCVR);
 208 }
 209
 210 static void palm_bk3710_set_dma_mode(ide_drive_t *drive, u8 xferspeed)
 211 {
 212         int is_slave = drive->dn & 1;
 213         void __iomem *base = (void *)drive->hwif->dma_base;
 214
 215         if (xferspeed >= XFER_UDMA_0) {
 216                 palm_bk3710_setudmamode(base, is_slave,
 217                                         xferspeed - XFER_UDMA_0);
 218         } else {
 219                 palm_bk3710_setdmamode(base, is_slave, drive->id->eide_dma_min,
 220                                        xferspeed);
 221         }
 222 }
 223
 224 static void palm_bk3710_set_pio_mode(ide_drive_t *drive, u8 pio)
 225 {
 226         unsigned int cycle_time;
 227         int is_slave = drive->dn & 1;
 228         ide_drive_t *mate;
 229         void __iomem *base = (void *)drive->hwif->dma_base;
 230
 231         /*
 232          * Obtain the drive PIO data for tuning the Palm Chip registers
 233          */
 234         cycle_time = ide_pio_cycle_time(drive, pio);
 235         mate = ide_get_paired_drive(drive);
 236         palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
 237 }
 238
 239 static void __devinit palm_bk3710_chipinit(void __iomem *base)
 240 {
 241         /*
 242          * enable the reset_en of ATA controller so that when ata signals
 243          * are brought out, by writing into device config. at that
 244          * time por_n signal should not be 'Z' and have a stable value.
 245          */
 246         writel(0x0300, base + BK3710_MISCCTL);
 247
 248         /* wait for some time and deassert the reset of ATA Device. */
 249         mdelay(100);
 250
 251         /* Deassert the Reset */
 252         writel(0x0200, base + BK3710_MISCCTL);
 253
 254         /*
 255          * Program the IDETIMP Register Value based on the following assumptions
 256          *
 257          * (ATA_IDETIMP_IDEEN           , ENABLE ) |
 258          * (ATA_IDETIMP_SLVTIMEN        , DISABLE) |
 259          * (ATA_IDETIMP_RDYSMPL         , 70NS)    |
 260          * (ATA_IDETIMP_RDYRCVRY        , 50NS)    |
 261          * (ATA_IDETIMP_DMAFTIM1        , PIOCOMP) |
 262          * (ATA_IDETIMP_PREPOST1        , DISABLE) |
 263          * (ATA_IDETIMP_RDYSEN1         , DISABLE) |
 264          * (ATA_IDETIMP_PIOFTIM1        , DISABLE) |
 265          * (ATA_IDETIMP_DMAFTIM0        , PIOCOMP) |
 266          * (ATA_IDETIMP_PREPOST0        , DISABLE) |
 267          * (ATA_IDETIMP_RDYSEN0         , DISABLE) |
 268          * (ATA_IDETIMP_PIOFTIM0        , DISABLE)
 269          */
 270         writew(0xB388, base + BK3710_IDETIMP);
 271
 272         /*
 273          * Configure  SIDETIM  Register
 274          * (ATA_SIDETIM_RDYSMPS1        ,120NS ) |
 275          * (ATA_SIDETIM_RDYRCYS1        ,120NS )
 276          */
 277         writeb(0, base + BK3710_SIDETIM);
 278
 279         /*
 280          * UDMACTL Ultra-ATA DMA Control
 281          * (ATA_UDMACTL_UDMAP1  , 0 ) |
 282          * (ATA_UDMACTL_UDMAP0  , 0 )
 283          *
 284          */
 285         writew(0, base + BK3710_UDMACTL);
 286
 287         /*
 288          * MISCCTL Miscellaneous Conrol Register
 289          * (ATA_MISCCTL_RSTMODEP        , 1) |
 290          * (ATA_MISCCTL_RESETP          , 0) |
 291          * (ATA_MISCCTL_TIMORIDE        , 1)
 292          */
 293         writel(0x201, base + BK3710_MISCCTL);
 294
 295         /*
 296          * IORDYTMP IORDY Timer for Primary Register
 297          * (ATA_IORDYTMP_IORDYTMP     , 0xffff  )
 298          */
 299         writel(0xFFFF, base + BK3710_IORDYTMP);
 300
 301         /*
 302          * Configure BMISP Register
 303          * (ATA_BMISP_DMAEN1    , DISABLE )     |
 304          * (ATA_BMISP_DMAEN0    , DISABLE )     |
 305          * (ATA_BMISP_IORDYINT  , CLEAR)        |
 306          * (ATA_BMISP_INTRSTAT  , CLEAR)        |
 307          * (ATA_BMISP_DMAERROR  , CLEAR)
 308          */
 309         writew(0, base + BK3710_BMISP);
 310
 311         palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
 312         palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
 313 }
 314
 315 static u8 __devinit palm_bk3710_cable_detect(ide_hwif_t *hwif)
 316 {
 317         return ATA_CBL_PATA80;
 318 }
 319
 320 static int __devinit palm_bk3710_init_dma(ide_hwif_t *hwif,
 321                                           const struct ide_port_info *d)
 322 {
 323         unsigned long base =
 324                 hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;
 325
 326         printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);
 327
 328         if (ide_allocate_dma_engine(hwif))
 329                 return -1;
 330
 331         ide_setup_dma(hwif, base);
 332
 333         return 0;
 334 }
 335
 336 static const struct ide_port_ops palm_bk3710_ports_ops = {
 337         .set_pio_mode           = palm_bk3710_set_pio_mode,
 338         .set_dma_mode           = palm_bk3710_set_dma_mode,
 339         .cable_detect           = palm_bk3710_cable_detect,
 340 };
 341
 342 static const struct ide_port_info __devinitdata palm_bk3710_port_info = {
 343         .init_dma               = palm_bk3710_init_dma,
 344         .port_ops               = &palm_bk3710_ports_ops,
 345         .host_flags             = IDE_HFLAG_MMIO,
 346         .pio_mask               = ATA_PIO4,
 347         .udma_mask              = ATA_UDMA4,    /* (input clk 99MHz) */
 348         .mwdma_mask             = ATA_MWDMA2,
 349 };
 350
 351 static int __devinit palm_bk3710_probe(struct platform_device *pdev)
 352 {
 353         struct clk *clkp;
 354         struct resource *mem, *irq;
 355         ide_hwif_t *hwif;
 356         void __iomem *base;
 357         int pribase, i;
 358         hw_regs_t hw;
 359         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 360
 361         clkp = clk_get(NULL, "IDECLK");
 362         if (IS_ERR(clkp))
 363                 return -ENODEV;
 364
 365         ideclkp = clkp;
 366         clk_enable(ideclkp);
 367         ide_palm_clk = clk_get_rate(ideclkp)/100000;
 368         ide_palm_clk = (10000/ide_palm_clk) + 1;
 369         /* Register the IDE interface with Linux ATA Interface */
 370         memset(&hw, 0, sizeof(hw));
 371
 372         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 373         if (mem == NULL) {
 374                 printk(KERN_ERR "failed to get memory region resource\n");
 375                 return -ENODEV;
 376         }
 377         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 378         if (irq == NULL) {
 379                 printk(KERN_ERR "failed to get IRQ resource\n");
 380                 return -ENODEV;
 381         }
 382
 383         base = (void *)mem->start;
 384
 385         /* Configure the Palm Chip controller */
 386         palm_bk3710_chipinit(base);
 387
 388         pribase = mem->start + IDE_PALM_ATA_PRI_REG_OFFSET;
 389         for (i = 0; i < IDE_NR_PORTS - 2; i++)
 390                 hw.io_ports_array[i] = pribase + i;
 391         hw.io_ports.ctl_addr = mem->start +
 392                         IDE_PALM_ATA_PRI_CTL_OFFSET;
 393         hw.irq = irq->start;
 394         hw.chipset = ide_palm3710;
 395
 396         hwif = ide_find_port();
 397         if (hwif == NULL)
 398                 goto out;
 399
 400         i = hwif->index;
 401
 402         ide_init_port_data(hwif, i);
 403         ide_init_port_hw(hwif, &hw);
 404
 405         hwif->mmio = 1;
 406         default_hwif_mmiops(hwif);
 407
 408         idx[0] = i;
 409
 410         ide_device_add(idx, &palm_bk3710_port_info);
 411
 412         if (!hwif->present)
 413                 goto out;
 414
 415         return 0;
 416 out:
 417         printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
 418         return -ENODEV;
 419 }
 420
 421 /* work with hotplug and coldplug */
 422 MODULE_ALIAS("platform:palm_bk3710");
 423
 424 static struct platform_driver platform_bk_driver = {
 425         .driver = {
 426                 .name = "palm_bk3710",
 427                 .owner = THIS_MODULE,
 428         },
 429         .probe = palm_bk3710_probe,
 430         .remove = NULL,
 431 };
 432
 433 static int __init palm_bk3710_init(void)
 434 {
 435         return platform_driver_register(&platform_bk_driver);
 436 }
 437
 438 module_init(palm_bk3710_init);
 439 MODULE_LICENSE("GPL");
 440