drivers/ide/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/ide.h>
  31 #include <linux/delay.h>
  32 #include <linux/init.h>
  33 #include <linux/clk.h>
  34 #include <linux/platform_device.h>
  35
  36 /* Offset of the primary interface registers */
  37 #define IDE_PALM_ATA_PRI_REG_OFFSET 0x1F0
  38
  39 /* Primary Control Offset */
  40 #define IDE_PALM_ATA_PRI_CTL_OFFSET 0x3F6
  41
  42 #define BK3710_BMICP            0x00
  43 #define BK3710_BMISP            0x02
  44 #define BK3710_BMIDTP           0x04
  45 #define BK3710_IDETIMP          0x40
  46 #define BK3710_IDESTATUS        0x47
  47 #define BK3710_UDMACTL          0x48
  48 #define BK3710_MISCCTL          0x50
  49 #define BK3710_REGSTB           0x54
  50 #define BK3710_REGRCVR          0x58
  51 #define BK3710_DATSTB           0x5C
  52 #define BK3710_DATRCVR          0x60
  53 #define BK3710_DMASTB           0x64
  54 #define BK3710_DMARCVR          0x68
  55 #define BK3710_UDMASTB          0x6C
  56 #define BK3710_UDMATRP          0x70
  57 #define BK3710_UDMAENV          0x74
  58 #define BK3710_IORDYTMP         0x78
  59
  60 static unsigned ideclk_period; /* in nanoseconds */
  61
  62 struct palm_bk3710_udmatiming {
  63         unsigned int rptime;    /* tRP -- Ready to pause time (nsec) */
  64         unsigned int cycletime; /* tCYCTYP2/2 -- avg Cycle Time (nsec) */
  65                                 /* tENV is always a minimum of 20 nsec */
  66 };
  67
  68 static const struct palm_bk3710_udmatiming palm_bk3710_udmatimings[6] = {
  69         { 160, 240 / 2 },       /* UDMA Mode 0 */
  70         { 125, 160 / 2 },       /* UDMA Mode 1 */
  71         { 100, 120 / 2 },       /* UDMA Mode 2 */
  72         { 100,  90 / 2 },       /* UDMA Mode 3 */
  73         { 100,  60 / 2 },       /* UDMA Mode 4 */
  74         {  85,  40 / 2 },       /* UDMA Mode 5 */
  75 };
  76
  77 static void palm_bk3710_setudmamode(void __iomem *base, unsigned int dev,
  78                                     unsigned int mode)
  79 {
  80         u8 tenv, trp, t0;
  81         u32 val32;
  82         u16 val16;
  83
  84         /* DMA Data Setup */
  85         t0 = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].cycletime,
  86                           ideclk_period) - 1;
  87         tenv = DIV_ROUND_UP(20, ideclk_period) - 1;
  88         trp = DIV_ROUND_UP(palm_bk3710_udmatimings[mode].rptime,
  89                            ideclk_period) - 1;
  90
  91         /* udmastb Ultra DMA Access Strobe Width */
  92         val32 = readl(base + BK3710_UDMASTB) & (0xFF << (dev ? 0 : 8));
  93         val32 |= (t0 << (dev ? 8 : 0));
  94         writel(val32, base + BK3710_UDMASTB);
  95
  96         /* udmatrp Ultra DMA Ready to Pause Time */
  97         val32 = readl(base + BK3710_UDMATRP) & (0xFF << (dev ? 0 : 8));
  98         val32 |= (trp << (dev ? 8 : 0));
  99         writel(val32, base + BK3710_UDMATRP);
 100
 101         /* udmaenv Ultra DMA envelop Time */
 102         val32 = readl(base + BK3710_UDMAENV) & (0xFF << (dev ? 0 : 8));
 103         val32 |= (tenv << (dev ? 8 : 0));
 104         writel(val32, base + BK3710_UDMAENV);
 105
 106         /* Enable UDMA for Device */
 107         val16 = readw(base + BK3710_UDMACTL) | (1 << dev);
 108         writew(val16, base + BK3710_UDMACTL);
 109 }
 110
 111 static void palm_bk3710_setdmamode(void __iomem *base, unsigned int dev,
 112                                    unsigned short min_cycle,
 113                                    unsigned int mode)
 114 {
 115         u8 td, tkw, t0;
 116         u32 val32;
 117         u16 val16;
 118         struct ide_timing *t;
 119         int cycletime;
 120
 121         t = ide_timing_find_mode(mode);
 122         cycletime = max_t(int, t->cycle, min_cycle);
 123
 124         /* DMA Data Setup */
 125         t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 126         td = DIV_ROUND_UP(t->active, ideclk_period);
 127         tkw = t0 - td - 1;
 128         td -= 1;
 129
 130         val32 = readl(base + BK3710_DMASTB) & (0xFF << (dev ? 0 : 8));
 131         val32 |= (td << (dev ? 8 : 0));
 132         writel(val32, base + BK3710_DMASTB);
 133
 134         val32 = readl(base + BK3710_DMARCVR) & (0xFF << (dev ? 0 : 8));
 135         val32 |= (tkw << (dev ? 8 : 0));
 136         writel(val32, base + BK3710_DMARCVR);
 137
 138         /* Disable UDMA for Device */
 139         val16 = readw(base + BK3710_UDMACTL) & ~(1 << dev);
 140         writew(val16, base + BK3710_UDMACTL);
 141 }
 142
 143 static void palm_bk3710_setpiomode(void __iomem *base, ide_drive_t *mate,
 144                                    unsigned int dev, unsigned int cycletime,
 145                                    unsigned int mode)
 146 {
 147         u8 t2, t2i, t0;
 148         u32 val32;
 149         struct ide_timing *t;
 150
 151         t = ide_timing_find_mode(XFER_PIO_0 + mode);
 152
 153         /* PIO Data Setup */
 154         t0 = DIV_ROUND_UP(cycletime, ideclk_period);
 155         t2 = DIV_ROUND_UP(t->active, ideclk_period);
 156
 157         t2i = t0 - t2 - 1;
 158         t2 -= 1;
 159
 160         val32 = readl(base + BK3710_DATSTB) & (0xFF << (dev ? 0 : 8));
 161         val32 |= (t2 << (dev ? 8 : 0));
 162         writel(val32, base + BK3710_DATSTB);
 163
 164         val32 = readl(base + BK3710_DATRCVR) & (0xFF << (dev ? 0 : 8));
 165         val32 |= (t2i << (dev ? 8 : 0));
 166         writel(val32, base + BK3710_DATRCVR);
 167
 168         if (mate) {
 169                 u8 mode2 = mate->pio_mode - XFER_PIO_0;
 170
 171                 if (mode2 < mode)
 172                         mode = mode2;
 173         }
 174
 175         /* TASKFILE Setup */
 176         t0 = DIV_ROUND_UP(t->cyc8b, ideclk_period);
 177         t2 = DIV_ROUND_UP(t->act8b, ideclk_period);
 178
 179         t2i = t0 - t2 - 1;
 180         t2 -= 1;
 181
 182         val32 = readl(base + BK3710_REGSTB) & (0xFF << (dev ? 0 : 8));
 183         val32 |= (t2 << (dev ? 8 : 0));
 184         writel(val32, base + BK3710_REGSTB);
 185
 186         val32 = readl(base + BK3710_REGRCVR) & (0xFF << (dev ? 0 : 8));
 187         val32 |= (t2i << (dev ? 8 : 0));
 188         writel(val32, base + BK3710_REGRCVR);
 189 }
 190
 191 static void palm_bk3710_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 192 {
 193         int is_slave = drive->dn & 1;
 194         void __iomem *base = (void __iomem *)hwif->dma_base;
 195         const u8 xferspeed = drive->dma_mode;
 196
 197         if (xferspeed >= XFER_UDMA_0) {
 198                 palm_bk3710_setudmamode(base, is_slave,
 199                                         xferspeed - XFER_UDMA_0);
 200         } else {
 201                 palm_bk3710_setdmamode(base, is_slave,
 202                                        drive->id[ATA_ID_EIDE_DMA_MIN],
 203                                        xferspeed);
 204         }
 205 }
 206
 207 static void palm_bk3710_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 208 {
 209         unsigned int cycle_time;
 210         int is_slave = drive->dn & 1;
 211         ide_drive_t *mate;
 212         void __iomem *base = (void __iomem *)hwif->dma_base;
 213         const u8 pio = drive->pio_mode - XFER_PIO_0;
 214
 215         /*
 216          * Obtain the drive PIO data for tuning the Palm Chip registers
 217          */
 218         cycle_time = ide_pio_cycle_time(drive, pio);
 219         mate = ide_get_pair_dev(drive);
 220         palm_bk3710_setpiomode(base, mate, is_slave, cycle_time, pio);
 221 }
 222
 223 static void palm_bk3710_chipinit(void __iomem *base)
 224 {
 225         /*
 226          * REVISIT:  the ATA reset signal needs to be managed through a
 227          * GPIO, which means it should come from platform_data.  Until
 228          * we get and use such information, we have to trust that things
 229          * have been reset before we get here.
 230          */
 231
 232         /*
 233          * Program the IDETIMP Register Value based on the following assumptions
 234          *
 235          * (ATA_IDETIMP_IDEEN           , ENABLE ) |
 236          * (ATA_IDETIMP_PREPOST1        , DISABLE) |
 237          * (ATA_IDETIMP_PREPOST0        , DISABLE) |
 238          *
 239          * DM6446 silicon rev 2.1 and earlier have no observed net benefit
 240          * from enabling prefetch/postwrite.
 241          */
 242         writew(BIT(15), base + BK3710_IDETIMP);
 243
 244         /*
 245          * UDMACTL Ultra-ATA DMA Control
 246          * (ATA_UDMACTL_UDMAP1  , 0 ) |
 247          * (ATA_UDMACTL_UDMAP0  , 0 )
 248          *
 249          */
 250         writew(0, base + BK3710_UDMACTL);
 251
 252         /*
 253          * MISCCTL Miscellaneous Conrol Register
 254          * (ATA_MISCCTL_HWNHLD1P        , 1 cycle)
 255          * (ATA_MISCCTL_HWNHLD0P        , 1 cycle)
 256          * (ATA_MISCCTL_TIMORIDE        , 1)
 257          */
 258         writel(0x001, base + BK3710_MISCCTL);
 259
 260         /*
 261          * IORDYTMP IORDY Timer for Primary Register
 262          * (ATA_IORDYTMP_IORDYTMP     , 0xffff  )
 263          */
 264         writel(0xFFFF, base + BK3710_IORDYTMP);
 265
 266         /*
 267          * Configure BMISP Register
 268          * (ATA_BMISP_DMAEN1    , DISABLE )     |
 269          * (ATA_BMISP_DMAEN0    , DISABLE )     |
 270          * (ATA_BMISP_IORDYINT  , CLEAR)        |
 271          * (ATA_BMISP_INTRSTAT  , CLEAR)        |
 272          * (ATA_BMISP_DMAERROR  , CLEAR)
 273          */
 274         writew(0, base + BK3710_BMISP);
 275
 276         palm_bk3710_setpiomode(base, NULL, 0, 600, 0);
 277         palm_bk3710_setpiomode(base, NULL, 1, 600, 0);
 278 }
 279
 280 static u8 palm_bk3710_cable_detect(ide_hwif_t *hwif)
 281 {
 282         return ATA_CBL_PATA80;
 283 }
 284
 285 static int palm_bk3710_init_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
 286 {
 287         printk(KERN_INFO "    %s: MMIO-DMA\n", hwif->name);
 288
 289         if (ide_allocate_dma_engine(hwif))
 290                 return -1;
 291
 292         hwif->dma_base = hwif->io_ports.data_addr - IDE_PALM_ATA_PRI_REG_OFFSET;
 293
 294         return 0;
 295 }
 296
 297 static const struct ide_port_ops palm_bk3710_ports_ops = {
 298         .set_pio_mode           = palm_bk3710_set_pio_mode,
 299         .set_dma_mode           = palm_bk3710_set_dma_mode,
 300         .cable_detect           = palm_bk3710_cable_detect,
 301 };
 302
 303 static struct ide_port_info palm_bk3710_port_info = {
 304         .init_dma               = palm_bk3710_init_dma,
 305         .port_ops               = &palm_bk3710_ports_ops,
 306         .dma_ops                = &sff_dma_ops,
 307         .host_flags             = IDE_HFLAG_MMIO,
 308         .pio_mask               = ATA_PIO4,
 309         .mwdma_mask             = ATA_MWDMA2,
 310         .chipset                = ide_palm3710,
 311 };
 312
 313 static int __init palm_bk3710_probe(struct platform_device *pdev)
 314 {
 315         struct clk *clk;
 316         struct resource *mem, *irq;
 317         void __iomem *base;
 318         unsigned long rate, mem_size;
 319         int i, rc;
 320         struct ide_hw hw, *hws[] = { &hw };
 321
 322         clk = clk_get(&pdev->dev, NULL);
 323         if (IS_ERR(clk))
 324                 return -ENODEV;
 325
 326         clk_enable(clk);
 327         rate = clk_get_rate(clk);
 328
 329         /* NOTE:  round *down* to meet minimum timings; we count in clocks */
 330         ideclk_period = 1000000000UL / rate;
 331
 332         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 333         if (mem == NULL) {
 334                 printk(KERN_ERR "failed to get memory region resource\n");
 335                 return -ENODEV;
 336         }
 337
 338         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 339         if (irq == NULL) {
 340                 printk(KERN_ERR "failed to get IRQ resource\n");
 341                 return -ENODEV;
 342         }
 343
 344         mem_size = resource_size(mem);
 345         if (request_mem_region(mem->start, mem_size, "palm_bk3710") == NULL) {
 346                 printk(KERN_ERR "failed to request memory region\n");
 347                 return -EBUSY;
 348         }
 349
 350         base = ioremap(mem->start, mem_size);
 351         if (!base) {
 352                 printk(KERN_ERR "failed to map IO memory\n");
 353                 release_mem_region(mem->start, mem_size);
 354                 return -ENOMEM;
 355         }
 356
 357         /* Configure the Palm Chip controller */
 358         palm_bk3710_chipinit(base);
 359
 360         memset(&hw, 0, sizeof(hw));
 361         for (i = 0; i < IDE_NR_PORTS - 2; i++)
 362                 hw.io_ports_array[i] = (unsigned long)
 363                                 (base + IDE_PALM_ATA_PRI_REG_OFFSET + i);
 364         hw.io_ports.ctl_addr = (unsigned long)
 365                         (base + IDE_PALM_ATA_PRI_CTL_OFFSET);
 366         hw.irq = irq->start;
 367         hw.dev = &pdev->dev;
 368
 369         palm_bk3710_port_info.udma_mask = rate < 100000000 ? ATA_UDMA4 :
 370                                                              ATA_UDMA5;
 371
 372         /* Register the IDE interface with Linux */
 373         rc = ide_host_add(&palm_bk3710_port_info, hws, 1, NULL);
 374         if (rc)
 375                 goto out;
 376
 377         return 0;
 378 out:
 379         printk(KERN_WARNING "Palm Chip BK3710 IDE Register Fail\n");
 380         return rc;
 381 }
 382
 383 /* work with hotplug and coldplug */
 384 MODULE_ALIAS("platform:palm_bk3710");
 385
 386 static struct platform_driver platform_bk_driver = {
 387         .driver = {
 388                 .name = "palm_bk3710",
 389         },
 390 };
 391
 392 static int __init palm_bk3710_init(void)
 393 {
 394         return platform_driver_probe(&platform_bk_driver, palm_bk3710_probe);
 395 }
 396
 397 module_init(palm_bk3710_init);
 398 MODULE_LICENSE("GPL");