tx4938ide.c revision 6762511934e6e7287ce3c8baac0d52ef64e3787b
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 19#include <asm/ide.h> 20#include <asm/txx9/tx4938.h> 21 22static void tx4938ide_tune_ebusc(unsigned int ebus_ch, 23 unsigned int gbus_clock, 24 u8 pio) 25{ 26 struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); 27 u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]); 28 unsigned int sp = (cr >> 4) & 3; 29 unsigned int clock = gbus_clock / (4 - sp); 30 unsigned int cycle = 1000000000 / clock; 31 unsigned int shwt; 32 int wt; 33 34 /* Minimum DIOx- active time */ 35 wt = DIV_ROUND_UP(t->act8b, cycle) - 2; 36 /* IORDY setup time: 35ns */ 37 wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); 38 /* actual wait-cycle is max(wt & ~1, 1) */ 39 if (wt > 2 && (wt & 1)) 40 wt++; 41 wt &= ~1; 42 /* Address-valid to DIOR/DIOW setup */ 43 shwt = DIV_ROUND_UP(t->setup, cycle); 44 45 /* -DIOx recovery time (SHWT * 4) and cycle time requirement */ 46 while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle) 47 shwt++; 48 if (shwt > 7) { 49 pr_warning("tx4938ide: SHWT violation (%d)\n", shwt); 50 shwt = 7; 51 } 52 pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", 53 ebus_ch, cycle, wt, shwt); 54 55 __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt, 56 &tx4938_ebuscptr->cr[ebus_ch]); 57} 58 59static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio) 60{ 61 ide_hwif_t *hwif = drive->hwif; 62 struct tx4938ide_platform_info *pdata = hwif->dev->platform_data; 63 u8 safe = pio; 64 ide_drive_t *pair; 65 66 pair = ide_get_pair_dev(drive); 67 if (pair) 68 safe = min(safe, ide_get_best_pio_mode(pair, 255, 5)); 69 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe); 70} 71 72#ifdef __BIG_ENDIAN 73 74/* custom iops (independent from SWAP_IO_SPACE) */ 75static u8 tx4938ide_inb(unsigned long port) 76{ 77 return __raw_readb((void __iomem *)port); 78} 79 80static void tx4938ide_outb(u8 value, unsigned long port) 81{ 82 __raw_writeb(value, (void __iomem *)port); 83} 84 85static void tx4938ide_tf_load(ide_drive_t *drive, struct ide_cmd *cmd) 86{ 87 ide_hwif_t *hwif = drive->hwif; 88 struct ide_io_ports *io_ports = &hwif->io_ports; 89 struct ide_taskfile *tf = &cmd->tf; 90 u8 HIHI = cmd->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF; 91 92 if (cmd->ftf_flags & IDE_FTFLAG_FLAGGED) 93 HIHI = 0xFF; 94 95 if (cmd->ftf_flags & IDE_FTFLAG_OUT_DATA) { 96 u16 data = (tf->hob_data << 8) | tf->data; 97 98 /* no endian swap */ 99 __raw_writew(data, (void __iomem *)io_ports->data_addr); 100 } 101 102 if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE) 103 tx4938ide_outb(tf->hob_feature, io_ports->feature_addr); 104 if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_NSECT) 105 tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr); 106 if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAL) 107 tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr); 108 if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAM) 109 tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr); 110 if (cmd->tf_flags & IDE_TFLAG_OUT_HOB_LBAH) 111 tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr); 112 113 if (cmd->tf_flags & IDE_TFLAG_OUT_FEATURE) 114 tx4938ide_outb(tf->feature, io_ports->feature_addr); 115 if (cmd->tf_flags & IDE_TFLAG_OUT_NSECT) 116 tx4938ide_outb(tf->nsect, io_ports->nsect_addr); 117 if (cmd->tf_flags & IDE_TFLAG_OUT_LBAL) 118 tx4938ide_outb(tf->lbal, io_ports->lbal_addr); 119 if (cmd->tf_flags & IDE_TFLAG_OUT_LBAM) 120 tx4938ide_outb(tf->lbam, io_ports->lbam_addr); 121 if (cmd->tf_flags & IDE_TFLAG_OUT_LBAH) 122 tx4938ide_outb(tf->lbah, io_ports->lbah_addr); 123 124 if (cmd->tf_flags & IDE_TFLAG_OUT_DEVICE) 125 tx4938ide_outb((tf->device & HIHI) | drive->select, 126 io_ports->device_addr); 127} 128 129static void tx4938ide_tf_read(ide_drive_t *drive, struct ide_cmd *cmd) 130{ 131 ide_hwif_t *hwif = drive->hwif; 132 struct ide_io_ports *io_ports = &hwif->io_ports; 133 struct ide_taskfile *tf = &cmd->tf; 134 135 if (cmd->ftf_flags & IDE_FTFLAG_IN_DATA) { 136 u16 data; 137 138 /* no endian swap */ 139 data = __raw_readw((void __iomem *)io_ports->data_addr); 140 tf->data = data & 0xff; 141 tf->hob_data = (data >> 8) & 0xff; 142 } 143 144 /* be sure we're looking at the low order bits */ 145 tx4938ide_outb(ATA_DEVCTL_OBS, io_ports->ctl_addr); 146 147 if (cmd->tf_flags & IDE_TFLAG_IN_ERROR) 148 tf->error = tx4938ide_inb(io_ports->feature_addr); 149 if (cmd->tf_flags & IDE_TFLAG_IN_NSECT) 150 tf->nsect = tx4938ide_inb(io_ports->nsect_addr); 151 if (cmd->tf_flags & IDE_TFLAG_IN_LBAL) 152 tf->lbal = tx4938ide_inb(io_ports->lbal_addr); 153 if (cmd->tf_flags & IDE_TFLAG_IN_LBAM) 154 tf->lbam = tx4938ide_inb(io_ports->lbam_addr); 155 if (cmd->tf_flags & IDE_TFLAG_IN_LBAH) 156 tf->lbah = tx4938ide_inb(io_ports->lbah_addr); 157 if (cmd->tf_flags & IDE_TFLAG_IN_DEVICE) 158 tf->device = tx4938ide_inb(io_ports->device_addr); 159 160 if (cmd->tf_flags & IDE_TFLAG_LBA48) { 161 tx4938ide_outb(ATA_HOB | ATA_DEVCTL_OBS, io_ports->ctl_addr); 162 163 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_ERROR) 164 tf->hob_error = tx4938ide_inb(io_ports->feature_addr); 165 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT) 166 tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr); 167 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL) 168 tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr); 169 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM) 170 tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr); 171 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH) 172 tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr); 173 } 174} 175 176static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd, 177 void *buf, unsigned int len) 178{ 179 unsigned long port = drive->hwif->io_ports.data_addr; 180 unsigned short *ptr = buf; 181 unsigned int count = (len + 1) / 2; 182 183 while (count--) 184 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); 185 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 186} 187 188static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd, 189 void *buf, unsigned int len) 190{ 191 unsigned long port = drive->hwif->io_ports.data_addr; 192 unsigned short *ptr = buf; 193 unsigned int count = (len + 1) / 2; 194 195 while (count--) { 196 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); 197 ptr++; 198 } 199 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 200} 201 202static const struct ide_tp_ops tx4938ide_tp_ops = { 203 .exec_command = ide_exec_command, 204 .read_status = ide_read_status, 205 .read_altstatus = ide_read_altstatus, 206 .write_devctl = ide_write_devctl, 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