--- /dev/null
+/*
+ * 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");
Code Review / kvmfornfv.git / blobdiff