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