| /* |
| * TX4938 internal IDE driver |
| * Based on tx4939ide.c. |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * (C) Copyright TOSHIBA CORPORATION 2005-2007 |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/ide.h> |
| #include <linux/init.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| |
| #include <asm/ide.h> |
| #include <asm/txx9/tx4938.h> |
| |
| static void tx4938ide_tune_ebusc(unsigned int ebus_ch, |
| unsigned int gbus_clock, |
| u8 pio) |
| { |
| struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); |
| u64 cr = __raw_readq(&tx4938_ebuscptr->cr[ebus_ch]); |
| unsigned int sp = (cr >> 4) & 3; |
| unsigned int clock = gbus_clock / (4 - sp); |
| unsigned int cycle = 1000000000 / clock; |
| unsigned int shwt; |
| int wt; |
| |
| /* Minimum DIOx- active time */ |
| wt = DIV_ROUND_UP(t->act8b, cycle) - 2; |
| /* IORDY setup time: 35ns */ |
| wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); |
| /* actual wait-cycle is max(wt & ~1, 1) */ |
| if (wt > 2 && (wt & 1)) |
| wt++; |
| wt &= ~1; |
| /* Address-valid to DIOR/DIOW setup */ |
| shwt = DIV_ROUND_UP(t->setup, cycle); |
| |
| /* -DIOx recovery time (SHWT * 4) and cycle time requirement */ |
| while ((shwt * 4 + wt + (wt ? 2 : 3)) * cycle < t->cycle) |
| shwt++; |
| if (shwt > 7) { |
| pr_warning("tx4938ide: SHWT violation (%d)\n", shwt); |
| shwt = 7; |
| } |
| pr_debug("tx4938ide: ebus %d, bus cycle %dns, WT %d, SHWT %d\n", |
| ebus_ch, cycle, wt, shwt); |
| |
| __raw_writeq((cr & ~0x3f007ull) | (wt << 12) | shwt, |
| &tx4938_ebuscptr->cr[ebus_ch]); |
| } |
| |
| static void tx4938ide_set_pio_mode(ide_drive_t *drive, const u8 pio) |
| { |
| ide_hwif_t *hwif = drive->hwif; |
| struct tx4938ide_platform_info *pdata = hwif->dev->platform_data; |
| u8 safe = pio; |
| ide_drive_t *pair; |
| |
| pair = ide_get_pair_dev(drive); |
| if (pair) |
| safe = min(safe, ide_get_best_pio_mode(pair, 255, 5)); |
| tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, safe); |
| } |
| |
| #ifdef __BIG_ENDIAN |
| |
| /* custom iops (independent from SWAP_IO_SPACE) */ |
| static void tx4938ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd, |
| void *buf, unsigned int len) |
| { |
| unsigned long port = drive->hwif->io_ports.data_addr; |
| unsigned short *ptr = buf; |
| unsigned int count = (len + 1) / 2; |
| |
| while (count--) |
| *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port)); |
| __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); |
| } |
| |
| static void tx4938ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd, |
| void *buf, unsigned int len) |
| { |
| unsigned long port = drive->hwif->io_ports.data_addr; |
| unsigned short *ptr = buf; |
| unsigned int count = (len + 1) / 2; |
| |
| while (count--) { |
| __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port); |
| ptr++; |
| } |
| __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2)); |
| } |
| |
| static const struct ide_tp_ops tx4938ide_tp_ops = { |
| .exec_command = ide_exec_command, |
| .read_status = ide_read_status, |
| .read_altstatus = ide_read_altstatus, |
| .write_devctl = ide_write_devctl, |
| |
| .dev_select = ide_dev_select, |
| .tf_load = ide_tf_load, |
| .tf_read = ide_tf_read, |
| |
| .input_data = tx4938ide_input_data_swap, |
| .output_data = tx4938ide_output_data_swap, |
| }; |
| |
| #endif /* __BIG_ENDIAN */ |
| |
| static const struct ide_port_ops tx4938ide_port_ops = { |
| .set_pio_mode = tx4938ide_set_pio_mode, |
| }; |
| |
| static const struct ide_port_info tx4938ide_port_info __initdata = { |
| .port_ops = &tx4938ide_port_ops, |
| #ifdef __BIG_ENDIAN |
| .tp_ops = &tx4938ide_tp_ops, |
| #endif |
| .host_flags = IDE_HFLAG_MMIO | IDE_HFLAG_NO_DMA, |
| .pio_mask = ATA_PIO5, |
| .chipset = ide_generic, |
| }; |
| |
| static int __init tx4938ide_probe(struct platform_device *pdev) |
| { |
| hw_regs_t hw; |
| hw_regs_t *hws[] = { &hw, NULL, NULL, NULL }; |
| struct ide_host *host; |
| struct resource *res; |
| struct tx4938ide_platform_info *pdata = pdev->dev.platform_data; |
| int irq, ret, i; |
| unsigned long mapbase, mapctl; |
| struct ide_port_info d = tx4938ide_port_info; |
| |
| irq = platform_get_irq(pdev, 0); |
| if (irq < 0) |
| return -ENODEV; |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) |
| return -ENODEV; |
| |
| if (!devm_request_mem_region(&pdev->dev, res->start, |
| res->end - res->start + 1, "tx4938ide")) |
| return -EBUSY; |
| mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start, |
| 8 << pdata->ioport_shift); |
| mapctl = (unsigned long)devm_ioremap(&pdev->dev, |
| res->start + 0x10000 + |
| (6 << pdata->ioport_shift), |
| 1 << pdata->ioport_shift); |
| if (!mapbase || !mapctl) |
| return -EBUSY; |
| |
| memset(&hw, 0, sizeof(hw)); |
| if (pdata->ioport_shift) { |
| unsigned long port = mapbase; |
| unsigned long ctl = mapctl; |
| |
| hw.io_ports_array[0] = port; |
| #ifdef __BIG_ENDIAN |
| port++; |
| ctl++; |
| #endif |
| for (i = 1; i <= 7; i++) |
| hw.io_ports_array[i] = |
| port + (i << pdata->ioport_shift); |
| hw.io_ports.ctl_addr = ctl; |
| } else |
| ide_std_init_ports(&hw, mapbase, mapctl); |
| hw.irq = irq; |
| hw.dev = &pdev->dev; |
| |
| pr_info("TX4938 IDE interface (base %#lx, ctl %#lx, irq %d)\n", |
| mapbase, mapctl, hw.irq); |
| if (pdata->gbus_clock) |
| tx4938ide_tune_ebusc(pdata->ebus_ch, pdata->gbus_clock, 0); |
| else |
| d.port_ops = NULL; |
| ret = ide_host_add(&d, hws, &host); |
| if (!ret) |
| platform_set_drvdata(pdev, host); |
| return ret; |
| } |
| |
| static int __exit tx4938ide_remove(struct platform_device *pdev) |
| { |
| struct ide_host *host = platform_get_drvdata(pdev); |
| |
| ide_host_remove(host); |
| return 0; |
| } |
| |
| static struct platform_driver tx4938ide_driver = { |
| .driver = { |
| .name = "tx4938ide", |
| .owner = THIS_MODULE, |
| }, |
| .remove = __exit_p(tx4938ide_remove), |
| }; |
| |
| static int __init tx4938ide_init(void) |
| { |
| return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe); |
| } |
| |
| static void __exit tx4938ide_exit(void) |
| { |
| platform_driver_unregister(&tx4938ide_driver); |
| } |
| |
| module_init(tx4938ide_init); |
| module_exit(tx4938ide_exit); |
| |
| MODULE_DESCRIPTION("TX4938 internal IDE driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform:tx4938ide"); |