318 lines
9.0 KiB
C
318 lines
9.0 KiB
C
/*
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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/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 wt, shwt;
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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(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_warning("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_drive_t *drive, const u8 pio)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct tx4938ide_platform_info *pdata = hwif->dev->platform_data;
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u8 safe = pio;
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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(safe, ide_get_best_pio_mode(pair, 255, 5));
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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 u8 tx4938ide_inb(unsigned long port)
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{
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return __raw_readb((void __iomem *)port);
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}
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static void tx4938ide_outb(u8 value, unsigned long port)
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{
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__raw_writeb(value, (void __iomem *)port);
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}
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static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct ide_io_ports *io_ports = &hwif->io_ports;
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struct ide_taskfile *tf = &task->tf;
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u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
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if (task->tf_flags & IDE_TFLAG_FLAGGED)
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HIHI = 0xFF;
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if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
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u16 data = (tf->hob_data << 8) | tf->data;
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/* no endian swap */
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__raw_writew(data, (void __iomem *)io_ports->data_addr);
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}
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if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
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tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
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tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
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tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
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tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
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tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
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tx4938ide_outb(tf->feature, io_ports->feature_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
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tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
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tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
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tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
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tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
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if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
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tx4938ide_outb((tf->device & HIHI) | drive->select,
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io_ports->device_addr);
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}
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static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task)
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{
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ide_hwif_t *hwif = drive->hwif;
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struct ide_io_ports *io_ports = &hwif->io_ports;
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struct ide_taskfile *tf = &task->tf;
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if (task->tf_flags & IDE_TFLAG_IN_DATA) {
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u16 data;
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/* no endian swap */
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data = __raw_readw((void __iomem *)io_ports->data_addr);
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tf->data = data & 0xff;
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tf->hob_data = (data >> 8) & 0xff;
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}
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/* be sure we're looking at the low order bits */
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tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
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if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
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tf->feature = tx4938ide_inb(io_ports->feature_addr);
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if (task->tf_flags & IDE_TFLAG_IN_NSECT)
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tf->nsect = tx4938ide_inb(io_ports->nsect_addr);
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if (task->tf_flags & IDE_TFLAG_IN_LBAL)
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tf->lbal = tx4938ide_inb(io_ports->lbal_addr);
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if (task->tf_flags & IDE_TFLAG_IN_LBAM)
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tf->lbam = tx4938ide_inb(io_ports->lbam_addr);
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if (task->tf_flags & IDE_TFLAG_IN_LBAH)
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tf->lbah = tx4938ide_inb(io_ports->lbah_addr);
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if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
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tf->device = tx4938ide_inb(io_ports->device_addr);
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if (task->tf_flags & IDE_TFLAG_LBA48) {
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tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
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tf->hob_feature =
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tx4938ide_inb(io_ports->feature_addr);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
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tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
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tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
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tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr);
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if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
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tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr);
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}
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}
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static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,
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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, count * 2);
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}
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static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,
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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, count * 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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.read_sff_dma_status = ide_read_sff_dma_status,
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.set_irq = ide_set_irq,
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.tf_load = tx4938ide_tf_load,
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.tf_read = tx4938ide_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 __initdata = {
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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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};
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static int __init tx4938ide_probe(struct platform_device *pdev)
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{
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hw_regs_t hw;
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hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
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struct ide_host *host;
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struct resource *res;
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struct tx4938ide_platform_info *pdata = pdev->dev.platform_data;
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int irq, ret, i;
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unsigned long mapbase;
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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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res->end - res->start + 1, "tx4938ide"))
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return -EBUSY;
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mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
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res->end - res->start + 1);
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if (!mapbase)
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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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hw.io_ports_array[0] = port;
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#ifdef __BIG_ENDIAN
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port++;
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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 =
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port + 0x10000 + (6 << pdata->ioport_shift);
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} else
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ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);
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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, irq %d)\n", mapbase, 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, &host);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, host);
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return 0;
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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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.owner = THIS_MODULE,
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},
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.remove = __exit_p(tx4938ide_remove),
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};
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static int __init tx4938ide_init(void)
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{
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return platform_driver_probe(&tx4938ide_driver, tx4938ide_probe);
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}
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static void __exit tx4938ide_exit(void)
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{
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platform_driver_unregister(&tx4938ide_driver);
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}
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module_init(tx4938ide_init);
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module_exit(tx4938ide_exit);
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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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