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