tx4938ide.c revision a294d97742568f429590cf2022d92e4b0c5f6ba0
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 20static 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 shwt; 30 int wt; 31 32 /* Minimum DIOx- active time */ 33 wt = DIV_ROUND_UP(t->act8b, cycle) - 2; 34 /* IORDY setup time: 35ns */ 35 wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); 36 /* actual wait-cycle is max(wt & ~1, 1) */ 37 if (wt > 2 && (wt & 1)) 38 wt++; 39 wt &= ~1; 40 /* Address-valid to DIOR/DIOW setup */ 41 shwt = DIV_ROUND_UP(t->setup, cycle); 42 43 /* -DIOx recovery time (SHWT * 4) and cycle time requirement */ 44 while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle) 45 shwt++; 46 if (shwt > 7) { 47 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt); 48 shwt = 7; 49 } 50 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", 51 ebus_ch, cycle, wt, shwt); 52 53 __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt, 54 &tx4938_ebuscptr->cr[ebus_ch]); 55} 56 57static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio) 58{ 59 ide_hwif_t *hwif = drive->hwif; 60 struct tx4938ide_platform_info *pdata = hwif->dev->platform_data; 61 u8 safe = pio; 62 ide_drive_t *pair; 63 64 pair = ide_get_pair_dev(drive); 65 if (pair) 66 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5)); 67 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe); 68} 69 70#ifdef __BIG_ENDIAN 71 72/* custom iops (independent from SWAP_IO_SPACE) */ 73static u8 tx4938ide_inb(unsigned long port) 74{ 75 return __raw_readb((void __iomem *)port); 76} 77 78static void tx4938ide_outb(u8 value, unsigned long port) 79{ 80 __raw_writeb(value, (void __iomem *)port); 81} 82 83static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task) 84{ 85 ide_hwif_t *hwif = drive->hwif; 86 struct ide_io_ports *io_ports = &hwif->io_ports; 87 struct ide_taskfile *tf = &task->tf; 88 u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF; 89 90 if (task->tf_flags & IDE_TFLAG_FLAGGED) 91 HIHI = 0xFF; 92 93 if (task->tf_flags & IDE_TFLAG_OUT_DATA) { 94 u16 data = (tf->hob_data << 8) | tf->data; 95 96 /* no endian swap */ 97 __raw_writew(data, (void __iomem *)io_ports->data_addr); 98 } 99 100 if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) 101 tx4938ide_outb(tf->hob_feature, io_ports->feature_addr); 102 if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) 103 tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr); 104 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) 105 tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr); 106 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) 107 tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr); 108 if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) 109 tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr); 110 111 if (task->tf_flags & IDE_TFLAG_OUT_FEATURE) 112 tx4938ide_outb(tf->feature, io_ports->feature_addr); 113 if (task->tf_flags & IDE_TFLAG_OUT_NSECT) 114 tx4938ide_outb(tf->nsect, io_ports->nsect_addr); 115 if (task->tf_flags & IDE_TFLAG_OUT_LBAL) 116 tx4938ide_outb(tf->lbal, io_ports->lbal_addr); 117 if (task->tf_flags & IDE_TFLAG_OUT_LBAM) 118 tx4938ide_outb(tf->lbam, io_ports->lbam_addr); 119 if (task->tf_flags & IDE_TFLAG_OUT_LBAH) 120 tx4938ide_outb(tf->lbah, io_ports->lbah_addr); 121 122 if (task->tf_flags & IDE_TFLAG_OUT_DEVICE) 123 tx4938ide_outb((tf->device & HIHI) | drive->select, 124 io_ports->device_addr); 125} 126 127static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task) 128{ 129 ide_hwif_t *hwif = drive->hwif; 130 struct ide_io_ports *io_ports = &hwif->io_ports; 131 struct ide_taskfile *tf = &task->tf; 132 133 if (task->tf_flags & IDE_TFLAG_IN_DATA) { 134 u16 data; 135 136 /* no endian swap */ 137 data = __raw_readw((void __iomem *)io_ports->data_addr); 138 tf->data = data & 0xff; 139 tf->hob_data = (data >> 8) & 0xff; 140 } 141 142 /* be sure we're looking at the low order bits */ 143 tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr); 144 145 if (task->tf_flags & IDE_TFLAG_IN_FEATURE) 146 tf->feature = tx4938ide_inb(io_ports->feature_addr); 147 if (task->tf_flags & IDE_TFLAG_IN_NSECT) 148 tf->nsect = tx4938ide_inb(io_ports->nsect_addr); 149 if (task->tf_flags & IDE_TFLAG_IN_LBAL) 150 tf->lbal = tx4938ide_inb(io_ports->lbal_addr); 151 if (task->tf_flags & IDE_TFLAG_IN_LBAM) 152 tf->lbam = tx4938ide_inb(io_ports->lbam_addr); 153 if (task->tf_flags & IDE_TFLAG_IN_LBAH) 154 tf->lbah = tx4938ide_inb(io_ports->lbah_addr); 155 if (task->tf_flags & IDE_TFLAG_IN_DEVICE) 156 tf->device = tx4938ide_inb(io_ports->device_addr); 157 158 if (task->tf_flags & IDE_TFLAG_LBA48) { 159 tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr); 160 161 if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) 162 tf->hob_feature = 163 tx4938ide_inb(io_ports->feature_addr); 164 if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT) 165 tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr); 166 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL) 167 tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr); 168 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM) 169 tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr); 170 if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH) 171 tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr); 172 } 173} 174 175static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq, 176 void *buf, unsigned int len) 177{ 178 unsigned long port = drive->hwif->io_ports.data_addr; 179 unsigned short *ptr = buf; 180 unsigned int count = (len + 1) / 2; 181 182 while (count--) 183 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); 184 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 185} 186 187static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq, 188 void *buf, unsigned int len) 189{ 190 unsigned long port = drive->hwif->io_ports.data_addr; 191 unsigned short *ptr = buf; 192 unsigned int count = (len + 1) / 2; 193 194 while (count--) { 195 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); 196 ptr++; 197 } 198 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 199} 200 201static const struct ide_tp_ops tx4938ide_tp_ops = { 202 .exec_command = ide_exec_command, 203 .read_status = ide_read_status, 204 .read_altstatus = ide_read_altstatus, 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 217static const struct ide_port_ops tx4938ide_port_ops = { 218 .set_pio_mode = tx4938ide_set_pio_mode, 219}; 220 221static 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 .chipset = ide_generic, 229}; 230 231static int __init tx4938ide_probe(struct platform_device *pdev) 232{ 233 hw_regs_t hw; 234 hw_regs_t *hws[] = { &hw, NULL, NULL, NULL }; 235 struct ide_host *host; 236 struct resource *res; 237 struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; 238 int irq, ret, i; 239 unsigned long mapbase, mapctl; 240 struct ide_port_info d = tx4938ide_port_info; 241 242 irq = platform_get_irq(pdev, 0); 243 if (irq < 0) 244 return -ENODEV; 245 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 246 if (!res) 247 return -ENODEV; 248 249 if (!devm_request_mem_region(&pdev->dev, res->start, 250 res->end - res->start + 1, "tx4938ide")) 251 return -EBUSY; 252 mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, 253 8 << pdata->ioport_shift); 254 mapctl = (unsigned long)devm_ioremap(&pdev->dev, 255 res->start + 0x10000 + 256 (6 << pdata->ioport_shift), 257 1 << pdata->ioport_shift); 258 if (!mapbase || !mapctl) 259 return -EBUSY; 260 261 memset(&hw, 0, sizeof(hw)); 262 if (pdata->ioport_shift) { 263 unsigned long port = mapbase; 264 unsigned long ctl = mapctl; 265 266 hw.io_ports_array[0] = port; 267#ifdef __BIG_ENDIAN 268 port++; 269 ctl++; 270#endif 271 for (i = 1; i <= 7; i++) 272 hw.io_ports_array[i] = 273 port + (i << pdata->ioport_shift); 274 hw.io_ports.ctl_addr = ctl; 275 } else 276 ide_std_init_ports(&hw, mapbase, mapctl); 277 hw.irq = irq; 278 hw.dev = &pdev->dev; 279 280 pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n", 281 mapbase, mapctl, hw.irq); 282 if (pdata->gbus_clock) 283 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); 284 else 285 d.port_ops = NULL; 286 ret = ide_host_add(&d, hws, &host); 287 if (!ret) 288 platform_set_drvdata(pdev, host); 289 return ret; 290} 291 292static int __exit tx4938ide_remove(struct platform_device *pdev) 293{ 294 struct ide_host *host = platform_get_drvdata(pdev); 295 296 ide_host_remove(host); 297 return 0; 298} 299 300static struct platform_driver tx4938ide_driver = { 301 .driver = { 302 .name = "tx4938ide", 303 .owner = THIS_MODULE, 304 }, 305 .remove = __exit_p(tx4938ide_remove), 306}; 307 308static int __init tx4938ide_init(void) 309{ 310 return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe); 311} 312 313static void __exit tx4938ide_exit(void) 314{ 315 platform_driver_unregister(&tx4938ide_driver); 316} 317 318module_init(tx4938ide_init); 319module_exit(tx4938ide_exit); 320 321MODULE_DESCRIPTION("TX4938 internal IDE driver"); 322MODULE_LICENSE("GPL"); 323MODULE_ALIAS("platform:tx4938ide"); 324