tx4938ide.c revision 22aa4b32a19b1f231d4ce7e9af6354b577a22a35
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 & ~0x80, io_ports->ctl_addr); 146 147 if (cmd->tf_flags & IDE_TFLAG_IN_FEATURE) 148 tf->feature = 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_DEVCTL_OBS | 0x80, io_ports->ctl_addr); 162 163 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_FEATURE) 164 tf->hob_feature = 165 tx4938ide_inb(io_ports->feature_addr); 166 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_NSECT) 167 tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr); 168 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAL) 169 tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr); 170 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAM) 171 tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr); 172 if (cmd->tf_flags & IDE_TFLAG_IN_HOB_LBAH) 173 tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr); 174 } 175} 176 177static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq, 178 void *buf, unsigned int len) 179{ 180 unsigned long port = drive->hwif->io_ports.data_addr; 181 unsigned short *ptr = buf; 182 unsigned int count = (len + 1) / 2; 183 184 while (count--) 185 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); 186 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 187} 188 189static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq, 190 void *buf, unsigned int len) 191{ 192 unsigned long port = drive->hwif->io_ports.data_addr; 193 unsigned short *ptr = buf; 194 unsigned int count = (len + 1) / 2; 195 196 while (count--) { 197 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); 198 ptr++; 199 } 200 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); 201} 202 203static const struct ide_tp_ops tx4938ide_tp_ops = { 204 .exec_command = ide_exec_command, 205 .read_status = ide_read_status, 206 .read_altstatus = ide_read_altstatus, 207 208 .set_irq = ide_set_irq, 209 210 .tf_load = tx4938ide_tf_load, 211 .tf_read = tx4938ide_tf_read, 212 213 .input_data = tx4938ide_input_data_swap, 214 .output_data = tx4938ide_output_data_swap, 215}; 216 217#endif /* __BIG_ENDIAN */ 218 219static const struct ide_port_ops tx4938ide_port_ops = { 220 .set_pio_mode = tx4938ide_set_pio_mode, 221}; 222 223static const struct ide_port_info tx4938ide_port_info __initdata = { 224 .port_ops = &tx4938ide_port_ops, 225#ifdef __BIG_ENDIAN 226 .tp_ops = &tx4938ide_tp_ops, 227#endif 228 .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA, 229 .pio_mask = ATA_PIO5, 230 .chipset = ide_generic, 231}; 232 233static int __init tx4938ide_probe(struct platform_device *pdev) 234{ 235 hw_regs_t hw; 236 hw_regs_t *hws[] = { &hw, NULL, NULL, NULL }; 237 struct ide_host *host; 238 struct resource *res; 239 struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; 240 int irq, ret, i; 241 unsigned long mapbase, mapctl; 242 struct ide_port_info d = tx4938ide_port_info; 243 244 irq = platform_get_irq(pdev, 0); 245 if (irq < 0) 246 return -ENODEV; 247 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 248 if (!res) 249 return -ENODEV; 250 251 if (!devm_request_mem_region(&pdev->dev, res->start, 252 res->end - res->start + 1, "tx4938ide")) 253 return -EBUSY; 254 mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, 255 8 << pdata->ioport_shift); 256 mapctl = (unsigned long)devm_ioremap(&pdev->dev, 257 res->start + 0x10000 + 258 (6 << pdata->ioport_shift), 259 1 << pdata->ioport_shift); 260 if (!mapbase || !mapctl) 261 return -EBUSY; 262 263 memset(&hw, 0, sizeof(hw)); 264 if (pdata->ioport_shift) { 265 unsigned long port = mapbase; 266 unsigned long ctl = mapctl; 267 268 hw.io_ports_array[0] = port; 269#ifdef __BIG_ENDIAN 270 port++; 271 ctl++; 272#endif 273 for (i = 1; i <= 7; i++) 274 hw.io_ports_array[i] = 275 port + (i << pdata->ioport_shift); 276 hw.io_ports.ctl_addr = ctl; 277 } else 278 ide_std_init_ports(&hw, mapbase, mapctl); 279 hw.irq = irq; 280 hw.dev = &pdev->dev; 281 282 pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n", 283 mapbase, mapctl, hw.irq); 284 if (pdata->gbus_clock) 285 tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); 286 else 287 d.port_ops = NULL; 288 ret = ide_host_add(&d, hws, &host); 289 if (!ret) 290 platform_set_drvdata(pdev, host); 291 return ret; 292} 293 294static int __exit tx4938ide_remove(struct platform_device *pdev) 295{ 296 struct ide_host *host = platform_get_drvdata(pdev); 297 298 ide_host_remove(host); 299 return 0; 300} 301 302static struct platform_driver tx4938ide_driver = { 303 .driver = { 304 .name = "tx4938ide", 305 .owner = THIS_MODULE, 306 }, 307 .remove = __exit_p(tx4938ide_remove), 308}; 309 310static int __init tx4938ide_init(void) 311{ 312 return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe); 313} 314 315static void __exit tx4938ide_exit(void) 316{ 317 platform_driver_unregister(&tx4938ide_driver); 318} 319 320module_init(tx4938ide_init); 321module_exit(tx4938ide_exit); 322 323MODULE_DESCRIPTION("TX4938 internal IDE driver"); 324MODULE_LICENSE("GPL"); 325MODULE_ALIAS("platform:tx4938ide"); 326