This is the driver for the Toshiba TX4938 SoC EBUS controller ATA mode.
It has custom set_pio_mode and some hacks for big endian.
Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
---
Changes since v1:
* fix wait-cycle calculation.
* get the base address from platform_device resource.
* request and ioremap whole CS0/1 regions.
* some cosmetic changes.
drivers/ide/Kconfig | 5 +
drivers/ide/mips/Makefile | 1 +
drivers/ide/mips/tx4938ide.c | 310 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 316 insertions(+), 0 deletions(-)
create mode 100644 drivers/ide/mips/tx4938ide.c
diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig
index 1f0eeba..decafcf 100644
--- a/drivers/ide/Kconfig
+++ b/drivers/ide/Kconfig
@@ -746,6 +746,11 @@ config BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ
default "128"
depends on BLK_DEV_IDE_AU1XXX
+config BLK_DEV_IDE_TX4938
+ tristate "TX4938 internal IDE support"
+ depends on SOC_TX4938
+ select IDE_TIMINGS
+
config BLK_DEV_IDE_TX4939
tristate "TX4939 internal IDE support"
depends on SOC_TX4939
diff --git a/drivers/ide/mips/Makefile b/drivers/ide/mips/Makefile
index 04e5d86..7b217e6 100644
--- a/drivers/ide/mips/Makefile
+++ b/drivers/ide/mips/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_BLK_DEV_IDE_AU1XXX) += au1xxx-ide.o
+obj-$(CONFIG_BLK_DEV_IDE_TX4938) += tx4938ide.o
obj-$(CONFIG_BLK_DEV_IDE_TX4939) += tx4939ide.o
EXTRA_CFLAGS := -Idrivers/ide
diff --git a/drivers/ide/mips/tx4938ide.c b/drivers/ide/mips/tx4938ide.c
new file mode 100644
index 0000000..fa660f9
--- /dev/null
+++ b/drivers/ide/mips/tx4938ide.c
@@ -0,0 +1,310 @@
+/*
+ * 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/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 wt, shwt;
+
+ /* Minimum DIOx- active time */
+ wt = DIV_ROUND_UP(t->act8b, cycle) - 2;
+ /* IORDY setup time: 35ns */
+ wt = max(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);
+
+ 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 u8 tx4938ide_inb(unsigned long port)
+{
+ return __raw_readb((void __iomem *)port);
+}
+
+static void tx4938ide_outb(u8 value, unsigned long port)
+{
+ __raw_writeb(value, (void __iomem *)port);
+}
+
+static void tx4938ide_tf_load(ide_drive_t *drive, ide_task_t *task)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ struct ide_io_ports *io_ports = &hwif->io_ports;
+ struct ide_taskfile *tf = &task->tf;
+ u8 HIHI = task->tf_flags & IDE_TFLAG_LBA48 ? 0xE0 : 0xEF;
+
+ if (task->tf_flags & IDE_TFLAG_FLAGGED)
+ HIHI = 0xFF;
+
+ if (task->tf_flags & IDE_TFLAG_OUT_DATA) {
+ u16 data = (tf->hob_data << 8) | tf->data;
+
+ /* no endian swap */
+ __raw_writew(data, (void __iomem *)io_ports->data_addr);
+ }
+
+ if (task->tf_flags & IDE_TFLAG_OUT_HOB_FEATURE)
+ tx4938ide_outb(tf->hob_feature, io_ports->feature_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_HOB_NSECT)
+ tx4938ide_outb(tf->hob_nsect, io_ports->nsect_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAL)
+ tx4938ide_outb(tf->hob_lbal, io_ports->lbal_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAM)
+ tx4938ide_outb(tf->hob_lbam, io_ports->lbam_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_HOB_LBAH)
+ tx4938ide_outb(tf->hob_lbah, io_ports->lbah_addr);
+
+ if (task->tf_flags & IDE_TFLAG_OUT_FEATURE)
+ tx4938ide_outb(tf->feature, io_ports->feature_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_NSECT)
+ tx4938ide_outb(tf->nsect, io_ports->nsect_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_LBAL)
+ tx4938ide_outb(tf->lbal, io_ports->lbal_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_LBAM)
+ tx4938ide_outb(tf->lbam, io_ports->lbam_addr);
+ if (task->tf_flags & IDE_TFLAG_OUT_LBAH)
+ tx4938ide_outb(tf->lbah, io_ports->lbah_addr);
+
+ if (task->tf_flags & IDE_TFLAG_OUT_DEVICE)
+ tx4938ide_outb((tf->device & HIHI) | drive->select,
+ io_ports->device_addr);
+}
+
+static void tx4938ide_tf_read(ide_drive_t *drive, ide_task_t *task)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ struct ide_io_ports *io_ports = &hwif->io_ports;
+ struct ide_taskfile *tf = &task->tf;
+
+ if (task->tf_flags & IDE_TFLAG_IN_DATA) {
+ u16 data;
+
+ /* no endian swap */
+ data = __raw_readw((void __iomem *)io_ports->data_addr);
+ tf->data = data & 0xff;
+ tf->hob_data = (data >> 8) & 0xff;
+ }
+
+ /* be sure we're looking at the low order bits */
+ tx4938ide_outb(ATA_DEVCTL_OBS & ~0x80, io_ports->ctl_addr);
+
+ if (task->tf_flags & IDE_TFLAG_IN_FEATURE)
+ tf->feature = tx4938ide_inb(io_ports->feature_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_NSECT)
+ tf->nsect = tx4938ide_inb(io_ports->nsect_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_LBAL)
+ tf->lbal = tx4938ide_inb(io_ports->lbal_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_LBAM)
+ tf->lbam = tx4938ide_inb(io_ports->lbam_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_LBAH)
+ tf->lbah = tx4938ide_inb(io_ports->lbah_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_DEVICE)
+ tf->device = tx4938ide_inb(io_ports->device_addr);
+
+ if (task->tf_flags & IDE_TFLAG_LBA48) {
+ tx4938ide_outb(ATA_DEVCTL_OBS | 0x80, io_ports->ctl_addr);
+
+ if (task->tf_flags & IDE_TFLAG_IN_HOB_FEATURE)
+ tf->hob_feature =
+ tx4938ide_inb(io_ports->feature_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_HOB_NSECT)
+ tf->hob_nsect = tx4938ide_inb(io_ports->nsect_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAL)
+ tf->hob_lbal = tx4938ide_inb(io_ports->lbal_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAM)
+ tf->hob_lbam = tx4938ide_inb(io_ports->lbam_addr);
+ if (task->tf_flags & IDE_TFLAG_IN_HOB_LBAH)
+ tf->hob_lbah = tx4938ide_inb(io_ports->lbah_addr);
+ }
+}
+
+static void tx4938ide_input_data_swap(ide_drive_t *drive, struct request *rq,
+ 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, count * 2);
+}
+
+static void tx4938ide_output_data_swap(ide_drive_t *drive, struct request *rq,
+ 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, count * 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,
+ .read_sff_dma_status = ide_read_sff_dma_status,
+
+ .set_irq = ide_set_irq,
+
+ .tf_load = tx4938ide_tf_load,
+ .tf_read = tx4938ide_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,
+};
+
+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;
+ 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,
+ res->end - res->start + 1);
+ if (!mapbase)
+ return -EBUSY;
+
+ memset(&hw, 0, sizeof(hw));
+ if (pdata->ioport_shift) {
+ unsigned long port = mapbase;
+
+ hw.io_ports_array[0] = port;
+#ifdef __BIG_ENDIAN
+ port++;
+#endif
+ for (i = 1; i <= 7; i++)
+ hw.io_ports_array[i] =
+ port + (i << pdata->ioport_shift);
+ hw.io_ports.ctl_addr =
+ port + 0x10000 + (6 << pdata->ioport_shift);
+ } else
+ ide_std_init_ports(&hw, mapbase, mapbase + 0x10006);
+ hw.irq = irq;
+ hw.dev = &pdev->dev;
+
+ pr_info("TX4938 IDE interface (base %#lx, irq %d)\n", mapbase, 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)
+ return ret;
+ platform_set_drvdata(pdev, host);
+ return 0;
+}
+
+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");
--
1.5.6.3
