Initial import

1 files changed, 209 insertions, 0 deletions

diff --git a/drivers/ide/tx4938ide.c b/drivers/ide/tx4938ide.c
new file mode 100644
index 000000000..40a3f55b0
--- /dev/null
+++ b/drivers/ide/tx4938ide.c
@@ -0,0 +1,209 @@
+/*
+ * 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_hwif_t *hwif, ide_drive_t *drive)
+{
+	struct tx4938ide_platform_info *pdata = dev_get_platdata(hwif->dev);
+	u8 safe = drive->pio_mode - XFER_PIO_0;
+	ide_drive_t *pair;
+
+	pair = ide_get_pair_dev(drive);
+	if (pair)
+		safe = min_t(u8, safe, pair->pio_mode - XFER_PIO_0);
+	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 __initconst = {
+	.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)
+{
+	struct ide_hw hw, *hws[] = { &hw };
+	struct ide_host *host;
+	struct resource *res;
+	struct tx4938ide_platform_info *pdata = dev_get_platdata(&pdev->dev);
+	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,
+				     resource_size(res), "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, 1, &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",
+	},
+	.remove = __exit_p(tx4938ide_remove),
+};
+
+module_platform_driver_probe(tx4938ide_driver, tx4938ide_probe);
+
+MODULE_DESCRIPTION("TX4938 internal IDE driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:tx4938ide");