drivers/ide/tx4938ide.c

   1 /*
   2  * TX4938 internal IDE driver
   3  * Based on tx4939ide.c.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  *
   9  * (C) Copyright TOSHIBA CORPORATION 2005-2007
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/ide.h>
  15 #include <linux/init.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/io.h>
  18 #include <asm/txx9/tx4938.h>
  19
  20 static void tx4938ide_tune_ebusc(unsigned int ebus_ch,
  21                                  unsigned int gbus_clock,
  22                                  u8 pio)
  23 {
  24         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
  25         u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]);
  26         unsigned int sp = (cr >> 4) & 3;
  27         unsigned int clock = gbus_clock / (4 - sp);
  28         unsigned int cycle = 1000000000 / clock;
  29         unsigned int wt, shwt;
  30
  31         /* Minimum DIOx- active time */
  32         wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
  33         /* IORDY setup time: 35ns */
  34         wt = max(wt, DIV_ROUND_UP(35, cycle));
  35         /* actual wait-cycle is max(wt & ~1, 1) */
  36         if (wt > 2 && (wt & 1))
  37                 wt++;
  38         wt &= ~1;
  39         /* Address-valid to DIOR/DIOW setup */
  40         shwt = DIV_ROUND_UP(t->setup, cycle);
  41
  42         /* -DIOx recovery time (SHWT * 4) and cycle time requirement */
  43         while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle)
  44                 shwt++;
  45         if (shwt > 7) {
  46                 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt);
  47                 shwt = 7;
  48         }
  49         pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n",
  50                  ebus_ch, cycle, wt, shwt);
  51
  52         __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt,
  53                      &tx4938_ebuscptr->cr[ebus_ch]);
  54 }
  55
  56 static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
  57 {
  58         ide_hwif_t *hwif = drive->hwif;
  59         struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
  60         u8 safe = pio;
  61         ide_drive_t *pair;
  62
  63         pair = ide_get_pair_dev(drive);
  64         if (pair)
  65                 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5));
  66         tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe);
  67 }
  68
  69 #ifdef __BIG_ENDIAN
  70
  71 /* custom iops (independent from SWAP_IO_SPACE) */
  72 static u8 tx4938ide_inb(unsigned long port)
  73 {
  74         return __raw_readb((void __iomem *)port);
  75 }
  76
  77 static void tx4938ide_outb(u8 value, unsigned long port)
  78 {
  79         __raw_writeb(value, (void __iomem *)port);
  80 }
  81
  82 static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task)
  83 {
  84         ide_hwif_t *hwif = drive->hwif;
  85         struct ide_io_ports *io_ports = &hwif->io_ports;
  86         struct ide_taskfile *tf = &task->tf;
  87         u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
  88
  89         if (task->tf_flags & IDE_TFLAG_FLAGGED)
  90                 HIHI = 0xFF;
  91
  92         if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
  93                 u16 data = (tf->hob_data << 8) | tf->data;
  94
  95                 /* no endian swap */
  96                 __raw_writew(data, (void __iomem *)io_ports->data_addr);
  97         }
  98
  99         if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
 100                 tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
 101         if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
 102                 tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
 103         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
 104                 tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
 105         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
 106                 tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
 107         if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
 108                 tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
 109
 110         if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
 111                 tx4938ide_outb(tf->feature, io_ports->feature_addr);
 112         if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
 113                 tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
 114         if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
 115                 tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
 116         if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
 117                 tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
 118         if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
 119                 tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
 120
 121         if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
 122                 tx4938ide_outb((tf->device & HIHI) | drive->select,
 123                                io_ports->device_addr);
 124 }
 125
 126 static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task)
 127 {
 128         ide_hwif_t *hwif = drive->hwif;
 129         struct ide_io_ports *io_ports = &hwif->io_ports;
 130         struct ide_taskfile *tf = &task->tf;
 131
 132         if (task->tf_flags & IDE_TFLAG_IN_DATA) {
 133                 u16 data;
 134
 135                 /* no endian swap */
 136                 data = __raw_readw((void __iomem *)io_ports->data_addr);
 137                 tf->data = data & 0xff;
 138                 tf->hob_data = (data >> 8) & 0xff;
 139         }
 140
 141         /* be sure we're looking at the low order bits */
 142         tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
 143
 144         if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
 145                 tf->feature = tx4938ide_inb(io_ports->feature_addr);
 146         if (task->tf_flags & IDE_TFLAG_IN_NSECT)
 147                 tf->nsect  = tx4938ide_inb(io_ports->nsect_addr);
 148         if (task->tf_flags & IDE_TFLAG_IN_LBAL)
 149                 tf->lbal   = tx4938ide_inb(io_ports->lbal_addr);
 150         if (task->tf_flags & IDE_TFLAG_IN_LBAM)
 151                 tf->lbam   = tx4938ide_inb(io_ports->lbam_addr);
 152         if (task->tf_flags & IDE_TFLAG_IN_LBAH)
 153                 tf->lbah   = tx4938ide_inb(io_ports->lbah_addr);
 154         if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
 155                 tf->device = tx4938ide_inb(io_ports->device_addr);
 156
 157         if (task->tf_flags & IDE_TFLAG_LBA48) {
 158                 tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
 159
 160                 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
 161                         tf->hob_feature =
 162                                 tx4938ide_inb(io_ports->feature_addr);
 163                 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
 164                         tf->hob_nsect   = tx4938ide_inb(io_ports->nsect_addr);
 165                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
 166                         tf->hob_lbal    = tx4938ide_inb(io_ports->lbal_addr);
 167                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
 168                         tf->hob_lbam    = tx4938ide_inb(io_ports->lbam_addr);
 169                 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
 170                         tf->hob_lbah    = tx4938ide_inb(io_ports->lbah_addr);
 171         }
 172 }
 173
 174 static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,
 175                                 void *buf, unsigned int len)
 176 {
 177         unsigned long port = drive->hwif->io_ports.data_addr;
 178         unsigned short *ptr = buf;
 179         unsigned int count = (len + 1) / 2;
 180
 181         while (count--)
 182                 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
 183         __ide_flush_dcache_range((unsigned long)buf, count * 2);
 184 }
 185
 186 static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,
 187                                 void *buf, unsigned int len)
 188 {
 189         unsigned long port = drive->hwif->io_ports.data_addr;
 190         unsigned short *ptr = buf;
 191         unsigned int count = (len + 1) / 2;
 192
 193         while (count--) {
 194                 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
 195                 ptr++;
 196         }
 197         __ide_flush_dcache_range((unsigned long)buf, count * 2);
 198 }
 199
 200 static const struct ide_tp_ops tx4938ide_tp_ops = {
 201         .exec_command           = ide_exec_command,
 202         .read_status            = ide_read_status,
 203         .read_altstatus         = ide_read_altstatus,
 204         .read_sff_dma_status    = ide_read_sff_dma_status,
 205
 206         .set_irq                = ide_set_irq,
 207
 208         .tf_load                = tx4938ide_tf_load,
 209         .tf_read                = tx4938ide_tf_read,
 210
 211         .input_data             = tx4938ide_input_data_swap,
 212         .output_data            = tx4938ide_output_data_swap,
 213 };
 214
 215 #endif  /* __BIG_ENDIAN */
 216
 217 static const struct ide_port_ops tx4938ide_port_ops = {
 218         .set_pio_mode = tx4938ide_set_pio_mode,
 219 };
 220
 221 static const struct ide_port_info tx4938ide_port_info __initdata = {
 222         .port_ops = &tx4938ide_port_ops,
 223 #ifdef __BIG_ENDIAN
 224         .tp_ops = &tx4938ide_tp_ops,
 225 #endif
 226         .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA,
 227         .pio_mask = ATA_PIO5,
 228 };
 229
 230 static int __init tx4938ide_probe(struct platform_device *pdev)
 231 {
 232         hw_regs_t hw;
 233         hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
 234         struct ide_host *host;
 235         struct resource *res;
 236         struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
 237         int irq, ret, i;
 238         unsigned long mapbase;
 239         struct ide_port_info d = tx4938ide_port_info;
 240
 241         irq = platform_get_irq(pdev, 0);
 242         if (irq < 0)
 243                 return -ENODEV;
 244         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 245         if (!res)
 246                 return -ENODEV;
 247
 248         if (!devm_request_mem_region(&pdev->dev, res->start,
 249                                      res->end - res->start + 1, "tx4938ide"))
 250                 return -EBUSY;
 251         mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
 252                                               res->end - res->start + 1);
 253         if (!mapbase)
 254                 return -EBUSY;
 255
 256         memset(&hw, 0, sizeof(hw));
 257         if (pdata->ioport_shift) {
 258                 unsigned long port = mapbase;
 259
 260                 hw.io_ports_array[0] = port;
 261 #ifdef __BIG_ENDIAN
 262                 port++;
 263 #endif
 264                 for (i = 1; i <= 7; i++)
 265                         hw.io_ports_array[i] =
 266                                 port + (i << pdata->ioport_shift);
 267                 hw.io_ports.ctl_addr =
 268                         port + 0x10000 + (6 << pdata->ioport_shift);
 269         } else
 270                 ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);
 271         hw.irq = irq;
 272         hw.dev = &pdev->dev;
 273
 274         pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, hw.irq);
 275         if (pdata->gbus_clock)
 276                 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0);
 277         else
 278                 d.port_ops = NULL;
 279         ret = ide_host_add(&d, hws, &host);
 280         if (ret)
 281                 return ret;
 282         platform_set_drvdata(pdev, host);
 283         return 0;
 284 }
 285
 286 static int __exit tx4938ide_remove(struct platform_device *pdev)
 287 {
 288         struct ide_host *host = platform_get_drvdata(pdev);
 289
 290         ide_host_remove(host);
 291         return 0;
 292 }
 293
 294 static struct platform_driver tx4938ide_driver = {
 295         .driver         = {
 296                 .name   = "tx4938ide",
 297                 .owner  = THIS_MODULE,
 298         },
 299         .remove = __exit_p(tx4938ide_remove),
 300 };
 301
 302 static int __init tx4938ide_init(void)
 303 {
 304         return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
 305 }
 306
 307 static void __exit tx4938ide_exit(void)
 308 {
 309         platform_driver_unregister(&tx4938ide_driver);
 310 }
 311
 312 module_init(tx4938ide_init);
 313 module_exit(tx4938ide_exit);
 314
 315 MODULE_DESCRIPTION("TX4938 internal IDE driver");
 316 MODULE_LICENSE("GPL");
 317 MODULE_ALIAS("platform:tx4938ide");