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path: root/drivers/ata/pata_imx.c
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Diffstat (limited to 'drivers/ata/pata_imx.c')
-rw-r--r--drivers/ata/pata_imx.c82
1 files changed, 57 insertions, 25 deletions
diff --git a/drivers/ata/pata_imx.c b/drivers/ata/pata_imx.c
index 139d20778b29..d4caa23f5a88 100644
--- a/drivers/ata/pata_imx.c
+++ b/drivers/ata/pata_imx.c
@@ -11,19 +11,26 @@
*
* TODO:
* - dmaengine support
- * - check if timing stuff needed
*/
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/blkdev.h>
-#include <scsi/scsi_host.h>
+
#include <linux/ata.h>
+#include <linux/clk.h>
#include <linux/libata.h>
+#include <linux/module.h>
#include <linux/platform_device.h>
-#include <linux/clk.h>
#define DRV_NAME "pata_imx"
+#define PATA_IMX_ATA_TIME_OFF 0x00
+#define PATA_IMX_ATA_TIME_ON 0x01
+#define PATA_IMX_ATA_TIME_1 0x02
+#define PATA_IMX_ATA_TIME_2W 0x03
+#define PATA_IMX_ATA_TIME_2R 0x04
+#define PATA_IMX_ATA_TIME_AX 0x05
+#define PATA_IMX_ATA_TIME_PIO_RDX 0x06
+#define PATA_IMX_ATA_TIME_4 0x07
+#define PATA_IMX_ATA_TIME_9 0x08
+
#define PATA_IMX_ATA_CONTROL 0x24
#define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
#define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
@@ -33,6 +40,10 @@
#define PATA_IMX_DRIVE_DATA 0xA0
#define PATA_IMX_DRIVE_CONTROL 0xD8
+static u32 pio_t4[] = { 30, 20, 15, 10, 10 };
+static u32 pio_t9[] = { 20, 15, 10, 10, 10 };
+static u32 pio_tA[] = { 35, 35, 35, 35, 35 };
+
struct pata_imx_priv {
struct clk *clk;
/* timings/interrupt/control regs */
@@ -40,28 +51,49 @@ struct pata_imx_priv {
u32 ata_ctl;
};
-static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
+static void pata_imx_set_timing(struct ata_device *adev,
+ struct pata_imx_priv *priv)
+{
+ struct ata_timing timing;
+ unsigned long clkrate;
+ u32 T, mode;
+
+ clkrate = clk_get_rate(priv->clk);
+
+ if (adev->pio_mode < XFER_PIO_0 || adev->pio_mode > XFER_PIO_4 ||
+ !clkrate)
+ return;
+
+ T = 1000000000 / clkrate;
+ ata_timing_compute(adev, adev->pio_mode, &timing, T * 1000, 0);
+
+ mode = adev->pio_mode - XFER_PIO_0;
+
+ writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_OFF);
+ writeb(3, priv->host_regs + PATA_IMX_ATA_TIME_ON);
+ writeb(timing.setup, priv->host_regs + PATA_IMX_ATA_TIME_1);
+ writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2W);
+ writeb(timing.act8b, priv->host_regs + PATA_IMX_ATA_TIME_2R);
+ writeb(1, priv->host_regs + PATA_IMX_ATA_TIME_PIO_RDX);
+
+ writeb(pio_t4[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_4);
+ writeb(pio_t9[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_9);
+ writeb(pio_tA[mode] / T + 1, priv->host_regs + PATA_IMX_ATA_TIME_AX);
+}
+
+static void pata_imx_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
- struct ata_device *dev;
- struct ata_port *ap = link->ap;
struct pata_imx_priv *priv = ap->host->private_data;
u32 val;
- ata_for_each_dev(dev, link, ENABLED) {
- dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
- dev->xfer_shift = ATA_SHIFT_PIO;
- dev->flags |= ATA_DFLAG_PIO;
-
- val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
- if (ata_pio_need_iordy(dev))
- val |= PATA_IMX_ATA_CTRL_IORDY_EN;
- else
- val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
- __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
+ pata_imx_set_timing(adev, priv);
- ata_dev_info(dev, "configured for PIO\n");
- }
- return 0;
+ val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
+ if (ata_pio_need_iordy(adev))
+ val |= PATA_IMX_ATA_CTRL_IORDY_EN;
+ else
+ val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
+ __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
}
static struct scsi_host_template pata_imx_sht = {
@@ -72,7 +104,7 @@ static struct ata_port_operations pata_imx_port_ops = {
.inherits = &ata_sff_port_ops,
.sff_data_xfer = ata_sff_data_xfer_noirq,
.cable_detect = ata_cable_unknown,
- .set_mode = pata_imx_set_mode,
+ .set_piomode = pata_imx_set_piomode,
};
static void pata_imx_setup_port(struct ata_ioports *ioaddr)
@@ -128,7 +160,7 @@ static int pata_imx_probe(struct platform_device *pdev)
ap = host->ports[0];
ap->ops = &pata_imx_port_ops;
- ap->pio_mask = ATA_PIO0;
+ ap->pio_mask = ATA_PIO4;
ap->flags |= ATA_FLAG_SLAVE_POSS;
io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);