[PATCH v3 1/3] PATA host controller driver for ep93xx
Rafal Prylowski
prylowski at metasoft.pl
Thu Apr 12 08:13:16 EDT 2012
Add PATA host controller driver for ep93xx.
Signed-off-by: Rafal Prylowski <prylowski at metasoft.pl>
Cc: Joao Ramos <joao.ramos at inov.pt>
Cc: H Hartley Sweeten <hsweeten at visionengravers.com>
Cc: Ryan Mallon <rmallon at gmail.com>
Cc: Sergei Shtylyov <sshtylyov at mvista.com>
Cc: Bartlomiej Zolnierkiewicz <bzolnier at gmail.com>
---
drivers/ata/Kconfig | 9
drivers/ata/Makefile | 1
drivers/ata/pata_ep93xx.c | 1044 ++++++++++++++++++++++++++++++++++++
Index: linux-2.6/drivers/ata/pata_ep93xx.c
===================================================================
--- /dev/null
+++ linux-2.6/drivers/ata/pata_ep93xx.c
@@ -0,0 +1,1044 @@
+/*
+ * EP93XX PATA controller driver.
+ *
+ * Copyright (c) 2012, Metasoft s.c.
+ * Rafal Prylowski <prylowski at metasoft.pl>
+ *
+ * Based on pata_scc.c, pata_icside.c and on earlier version of EP93XX
+ * PATA driver by Lennert Buytenhek and Alessandro Zummo.
+ * Read/Write timings, resource management and other improvements
+ * from driver by Joao Ramos and Bartlomiej Zolnierkiewicz.
+ * DMA engine support based on spi-ep93xx.c by Mika Westerberg.
+ *
+ * Original copyrights:
+ *
+ * Support for Cirrus Logic's EP93xx (EP9312, EP9315) CPUs
+ * PATA host controller driver.
+ *
+ * Copyright (c) 2009, Bartlomiej Zolnierkiewicz
+ *
+ * Heavily based on the ep93xx-ide.c driver:
+ *
+ * Copyright (c) 2009, Joao Ramos <joao.ramos at inov.pt>
+ * INESC Inovacao (INOV)
+ *
+ * EP93XX PATA controller driver.
+ * Copyright (C) 2007 Lennert Buytenhek <buytenh at wantstofly.org>
+ *
+ * An ATA driver for the Cirrus Logic EP93xx PATA controller.
+ *
+ * Based on an earlier version by Alessandro Zummo, which is:
+ * Copyright (C) 2006 Tower Technologies
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/blkdev.h>
+#include <scsi/scsi_host.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/dmaengine.h>
+#include <linux/ktime.h>
+
+#include <mach/dma.h>
+#include <mach/platform.h>
+
+#define DRV_NAME "ep93xx-ide"
+#define DRV_VERSION "1.0"
+
+enum {
+ /* IDE Control Register */
+ IDECTRL = 0x00,
+ IDECTRL_CS0N = (1 << 0),
+ IDECTRL_CS1N = (1 << 1),
+ IDECTRL_DIORN = (1 << 5),
+ IDECTRL_DIOWN = (1 << 6),
+ IDECTRL_INTRQ = (1 << 9),
+ IDECTRL_IORDY = (1 << 10),
+ /*
+ * the device IDE register to be accessed is selected through
+ * IDECTRL register's specific bitfields 'DA', 'CS1N' and 'CS0N':
+ * b4 b3 b2 b1 b0
+ * A2 A1 A0 CS1N CS0N
+ * the values filled in this structure allows the value to be directly
+ * ORed to the IDECTRL register, hence giving directly the A[2:0] and
+ * CS1N/CS0N values for each IDE register.
+ * The values correspond to the transformation:
+ * ((real IDE address) << 2) | CS1N value << 1 | CS0N value
+ */
+ IDECTRL_ADDR_CMD = 0 + 2, /* CS1 */
+ IDECTRL_ADDR_DATA = (ATA_REG_DATA << 2) + 2,
+ IDECTRL_ADDR_ERROR = (ATA_REG_ERR << 2) + 2,
+ IDECTRL_ADDR_FEATURE = (ATA_REG_FEATURE << 2) + 2,
+ IDECTRL_ADDR_NSECT = (ATA_REG_NSECT << 2) + 2,
+ IDECTRL_ADDR_LBAL = (ATA_REG_LBAL << 2) + 2,
+ IDECTRL_ADDR_LBAM = (ATA_REG_LBAM << 2) + 2,
+ IDECTRL_ADDR_LBAH = (ATA_REG_LBAH << 2) + 2,
+ IDECTRL_ADDR_DEVICE = (ATA_REG_DEVICE << 2) + 2,
+ IDECTRL_ADDR_STATUS = (ATA_REG_STATUS << 2) + 2,
+ IDECTRL_ADDR_COMMAND = (ATA_REG_CMD << 2) + 2,
+ IDECTRL_ADDR_ALTSTATUS = (0x06 << 2) + 1, /* CS0 */
+ IDECTRL_ADDR_CTL = (0x06 << 2) + 1, /* CS0 */
+
+ /* IDE Configuration Register */
+ IDECFG = 0x04,
+ IDECFG_IDEEN = (1 << 0),
+ IDECFG_PIO = (1 << 1),
+ IDECFG_MDMA = (1 << 2),
+ IDECFG_UDMA = (1 << 3),
+ IDECFG_MODE_SHIFT = 4,
+ IDECFG_MODE_MASK = (0xf << 4),
+ IDECFG_WST_SHIFT = 8,
+ IDECFG_WST_MASK = (0x3 << 8),
+
+ /* MDMA Operation Register */
+ IDEMDMAOP = 0x08,
+
+ /* UDMA Operation Register */
+ IDEUDMAOP = 0x0c,
+ IDEUDMAOP_UEN = (1 << 0),
+ IDEUDMAOP_RWOP = (1 << 1),
+
+ /* PIO/MDMA/UDMA Data Registers */
+ IDEDATAOUT = 0x10,
+ IDEDATAIN = 0x14,
+ IDEMDMADATAOUT = 0x18,
+ IDEMDMADATAIN = 0x1c,
+ IDEUDMADATAOUT = 0x20,
+ IDEUDMADATAIN = 0x24,
+
+ /* UDMA Status Register */
+ IDEUDMASTS = 0x28,
+ IDEUDMASTS_DMAIDE = (1 << 16),
+ IDEUDMASTS_INTIDE = (1 << 17),
+ IDEUDMASTS_SBUSY = (1 << 18),
+ IDEUDMASTS_NDO = (1 << 24),
+ IDEUDMASTS_NDI = (1 << 25),
+ IDEUDMASTS_N4X = (1 << 26),
+
+ /* UDMA Debug Status Register */
+ IDEUDMADEBUG = 0x2c,
+};
+
+struct ep93xx_pata_data {
+ const struct platform_device *pdev;
+ void __iomem *ide_base;
+ struct ata_timing t;
+ bool iordy;
+
+ unsigned long udma_in_phys;
+ unsigned long udma_out_phys;
+
+ struct dma_chan *dma_rx_channel;
+ struct ep93xx_dma_data dma_rx_data;
+ struct dma_chan *dma_tx_channel;
+ struct ep93xx_dma_data dma_tx_data;
+};
+
+static void ep93xx_pata_clear_regs(void __iomem *base)
+{
+ writel(IDECTRL_CS0N | IDECTRL_CS1N | IDECTRL_DIORN |
+ IDECTRL_DIOWN, base + IDECTRL);
+
+ writel(0, base + IDECFG);
+ writel(0, base + IDEMDMAOP);
+ writel(0, base + IDEUDMAOP);
+ writel(0, base + IDEDATAOUT);
+ writel(0, base + IDEDATAIN);
+ writel(0, base + IDEMDMADATAOUT);
+ writel(0, base + IDEMDMADATAIN);
+ writel(0, base + IDEUDMADATAOUT);
+ writel(0, base + IDEUDMADATAIN);
+ writel(0, base + IDEUDMADEBUG);
+}
+
+static bool ep93xx_pata_check_iordy(void __iomem *base)
+{
+ return !!(readl(base + IDECTRL) & IDECTRL_IORDY);
+}
+
+/*
+ * According to EP93xx User's Guide, WST field of IDECFG specifies number
+ * of HCLK cycles to hold the data bus after a PIO write operation.
+ * It should be programmed to guarantee following delays:
+ *
+ * PIO Mode [ns]
+ * 0 30
+ * 1 20
+ * 2 15
+ * 3 10
+ * 4 5
+ *
+ * Maximum possible value for HCLK is 100MHz.
+ */
+static int ep93xx_pata_get_wst(int pio_mode)
+{
+ int val;
+
+ if (pio_mode == 0)
+ val = 3;
+ else if (pio_mode < 3)
+ val = 2;
+ else
+ val = 1;
+
+ return val << IDECFG_WST_SHIFT;
+}
+
+static void ep93xx_pata_enable_pio(void __iomem *base, int pio_mode)
+{
+ writel(IDECFG_IDEEN | IDECFG_PIO |
+ ep93xx_pata_get_wst(pio_mode) |
+ (pio_mode << IDECFG_MODE_SHIFT), base + IDECFG);
+}
+
+/*
+ * Based on delay loop found in mach-pxa/mp900.c.
+ *
+ * Single iteration should take 5 cpu cycles. This is 25ns assuming the
+ * fastest ep93xx cpu speed (200MHz) and is better optimized for PIO4 timings
+ * than eg. 20ns.
+ */
+static void ep93xx_pata_delay(unsigned long count)
+{
+ __asm__ volatile (
+ "0:\n"
+ "mov r0, r0\n"
+ "subs %0, %1, #1\n"
+ "bge 0b\n"
+ : "=r" (count)
+ : "0" (count)
+ );
+}
+
+static unsigned long ep93xx_pata_wait_for_iordy(void __iomem *base,
+ unsigned long t2)
+{
+ /*
+ * According to ATA specification, IORDY pin can be first sampled
+ * tA = 35ns after activation of DIOR-/DIOW-. Maximum IORDY pulse
+ * width is tB = 1250ns.
+ *
+ * We are already t2 delay loop iterations after activation of
+ * DIOR-/DIOW-, so we set timeout to (1250 + 35) / 25 - t2 additional
+ * delay loop iterations.
+ */
+ unsigned long start = (1250 + 35) / 25 - t2;
+ unsigned long counter = start;
+
+ while (!ep93xx_pata_check_iordy(base) && counter--)
+ ep93xx_pata_delay(1);
+ return start - counter;
+}
+
+/* common part at start of ep93xx_pata_read/write() */
+static void ep93xx_pata_rw_begin(void __iomem *base, unsigned long addr,
+ unsigned long t1)
+{
+ writel(IDECTRL_DIOWN | IDECTRL_DIORN | addr, base + IDECTRL);
+ ep93xx_pata_delay(t1);
+}
+
+/* common part at end of ep93xx_pata_read/write() */
+static void ep93xx_pata_rw_end(void __iomem *base, unsigned long addr,
+ bool iordy, unsigned long t0, unsigned long t2,
+ unsigned long t2i)
+{
+ ep93xx_pata_delay(t2);
+ /* lengthen t2 if needed */
+ if (iordy)
+ t2 += ep93xx_pata_wait_for_iordy(base, t2);
+ writel(IDECTRL_DIOWN | IDECTRL_DIORN | addr, base + IDECTRL);
+ if (t0 > t2 && t0 - t2 > t2i)
+ ep93xx_pata_delay(t0 - t2);
+ else
+ ep93xx_pata_delay(t2i);
+}
+
+static u16 ep93xx_pata_read(struct ep93xx_pata_data *drv_data,
+ unsigned long addr,
+ bool reg)
+{
+ void __iomem *base = drv_data->ide_base;
+ const struct ata_timing *t = &drv_data->t;
+ unsigned long t0 = reg ? t->cyc8b : t->cycle;
+ unsigned long t2 = reg ? t->act8b : t->active;
+ unsigned long t2i = reg ? t->rec8b : t->recover;
+
+ ep93xx_pata_rw_begin(base, addr, t->setup);
+ writel(IDECTRL_DIOWN | addr, base + IDECTRL);
+ /*
+ * The IDEDATAIN register is loaded from the DD pins at the positive
+ * edge of the DIORN signal. (EP93xx UG p27-14)
+ */
+ ep93xx_pata_rw_end(base, addr, drv_data->iordy, t0, t2, t2i);
+ return readl(base + IDEDATAIN);
+}
+
+/* IDE register read */
+static u16 ep93xx_pata_read_reg(struct ep93xx_pata_data *drv_data,
+ unsigned long addr)
+{
+ return ep93xx_pata_read(drv_data, addr, true);
+}
+
+/* PIO data read */
+static u16 ep93xx_pata_read_data(struct ep93xx_pata_data *drv_data,
+ unsigned long addr)
+{
+ return ep93xx_pata_read(drv_data, addr, false);
+}
+
+static void ep93xx_pata_write(struct ep93xx_pata_data *drv_data,
+ u16 value, unsigned long addr,
+ bool reg)
+{
+ void __iomem *base = drv_data->ide_base;
+ const struct ata_timing *t = &drv_data->t;
+ unsigned long t0 = reg ? t->cyc8b : t->cycle;
+ unsigned long t2 = reg ? t->act8b : t->active;
+ unsigned long t2i = reg ? t->rec8b : t->recover;
+
+ ep93xx_pata_rw_begin(base, addr, t->setup);
+ /*
+ * Value from IDEDATAOUT register is driven onto the DD pins when
+ * DIOWN is low. (EP93xx UG p27-13)
+ */
+ writel(value, base + IDEDATAOUT);
+ writel(IDECTRL_DIORN | addr, base + IDECTRL);
+ ep93xx_pata_rw_end(base, addr, drv_data->iordy, t0, t2, t2i);
+}
+
+/* IDE register write */
+static void ep93xx_pata_write_reg(struct ep93xx_pata_data *drv_data,
+ u16 value, unsigned long addr)
+{
+ ep93xx_pata_write(drv_data, value, addr, true);
+}
+
+/* PIO data write */
+static void ep93xx_pata_write_data(struct ep93xx_pata_data *drv_data,
+ u16 value, unsigned long addr)
+{
+ ep93xx_pata_write(drv_data, value, addr, false);
+}
+
+static void ep93xx_pata_set_piomode(struct ata_port *ap,
+ struct ata_device *adev)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ struct ata_device *pair = ata_dev_pair(adev);
+ /*
+ * Calculate timings for the delay loop, assuming ep93xx cpu speed
+ * is 200MHz (maximum possible for ep93xx). If actual cpu speed is
+ * slower, we will wait a bit longer in each delay.
+ * Additional division of cpu speed by 5, because single iteration
+ * of our delay loop takes 5 cpu cycles (25ns).
+ */
+ unsigned long T = 1000000 / (200 / 5);
+
+ ata_timing_compute(adev, adev->pio_mode, &drv_data->t, T, 0);
+ if (pair && pair->pio_mode) {
+ struct ata_timing t;
+ ata_timing_compute(pair, pair->pio_mode, &t, T, 0);
+ ata_timing_merge(&t, &drv_data->t, &drv_data->t,
+ ATA_TIMING_SETUP | ATA_TIMING_8BIT);
+ }
+ drv_data->iordy = ata_pio_need_iordy(adev);
+
+ ep93xx_pata_enable_pio(drv_data->ide_base,
+ adev->pio_mode - XFER_PIO_0);
+}
+
+/* Note: original code is ata_sff_check_status */
+static u8 ep93xx_pata_check_status(struct ata_port *ap)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ return ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_STATUS);
+}
+
+static u8 ep93xx_pata_check_altstatus(struct ata_port *ap)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ return ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_ALTSTATUS);
+}
+
+/* Note: original code is ata_sff_tf_load */
+static void ep93xx_pata_tf_load(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ unsigned int is_addr = tf->flags & ATA_TFLAG_ISADDR;
+
+ if (tf->ctl != ap->last_ctl) {
+ ep93xx_pata_write_reg(drv_data, tf->ctl, IDECTRL_ADDR_CTL);
+ ap->last_ctl = tf->ctl;
+ ata_wait_idle(ap);
+ }
+
+ if (is_addr && (tf->flags & ATA_TFLAG_LBA48)) {
+ ep93xx_pata_write_reg(drv_data, tf->hob_feature,
+ IDECTRL_ADDR_FEATURE);
+ ep93xx_pata_write_reg(drv_data, tf->hob_nsect,
+ IDECTRL_ADDR_NSECT);
+ ep93xx_pata_write_reg(drv_data, tf->hob_lbal,
+ IDECTRL_ADDR_LBAL);
+ ep93xx_pata_write_reg(drv_data, tf->hob_lbam,
+ IDECTRL_ADDR_LBAM);
+ ep93xx_pata_write_reg(drv_data, tf->hob_lbah,
+ IDECTRL_ADDR_LBAH);
+ }
+
+ if (is_addr) {
+ ep93xx_pata_write_reg(drv_data, tf->feature,
+ IDECTRL_ADDR_FEATURE);
+ ep93xx_pata_write_reg(drv_data, tf->nsect, IDECTRL_ADDR_NSECT);
+ ep93xx_pata_write_reg(drv_data, tf->lbal, IDECTRL_ADDR_LBAL);
+ ep93xx_pata_write_reg(drv_data, tf->lbam, IDECTRL_ADDR_LBAM);
+ ep93xx_pata_write_reg(drv_data, tf->lbah, IDECTRL_ADDR_LBAH);
+ }
+
+ if (tf->flags & ATA_TFLAG_DEVICE)
+ ep93xx_pata_write_reg(drv_data, tf->device,
+ IDECTRL_ADDR_DEVICE);
+
+ ata_wait_idle(ap);
+}
+
+/* Note: original code is ata_sff_tf_read */
+static void ep93xx_pata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ tf->command = ep93xx_pata_check_status(ap);
+ tf->feature = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_FEATURE);
+ tf->nsect = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_NSECT);
+ tf->lbal = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_LBAL);
+ tf->lbam = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_LBAM);
+ tf->lbah = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_LBAH);
+ tf->device = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_DEVICE);
+
+ if (tf->flags & ATA_TFLAG_LBA48) {
+ ep93xx_pata_write_reg(drv_data, tf->ctl | ATA_HOB,
+ IDECTRL_ADDR_CTL);
+ tf->hob_feature = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_FEATURE);
+ tf->hob_nsect = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_NSECT);
+ tf->hob_lbal = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_LBAL);
+ tf->hob_lbam = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_LBAM);
+ tf->hob_lbah = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_LBAH);
+ ep93xx_pata_write_reg(drv_data, tf->ctl, IDECTRL_ADDR_CTL);
+ ap->last_ctl = tf->ctl;
+ }
+}
+
+/* Note: original code is ata_sff_exec_command */
+static void ep93xx_pata_exec_command(struct ata_port *ap,
+ const struct ata_taskfile *tf)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ ep93xx_pata_write_reg(drv_data, tf->command,
+ IDECTRL_ADDR_COMMAND);
+ ata_sff_pause(ap);
+}
+
+/* Note: original code is ata_sff_dev_select */
+static void ep93xx_pata_dev_select(struct ata_port *ap, unsigned int device)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ u8 tmp = ATA_DEVICE_OBS;
+
+ if (device != 0)
+ tmp |= ATA_DEV1;
+
+ ep93xx_pata_write_reg(drv_data, tmp, IDECTRL_ADDR_DEVICE);
+ ata_sff_pause(ap); /* needed; also flushes, for mmio */
+}
+
+/* Note: original code is ata_sff_set_devctl */
+static void ep93xx_pata_set_devctl(struct ata_port *ap, u8 ctl)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ ep93xx_pata_write_reg(drv_data, ctl, IDECTRL_ADDR_CTL);
+}
+
+/* Note: original code is ata_sff_data_xfer */
+static unsigned int ep93xx_pata_data_xfer(struct ata_device *adev,
+ unsigned char *buf,
+ unsigned int buflen, int rw)
+{
+ struct ata_port *ap = adev->link->ap;
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ u16 *data = (u16 *)buf;
+ unsigned int words = buflen >> 1;
+
+ /* Transfer multiple of 2 bytes */
+ while (words--)
+ if (rw == READ)
+ *data++ = cpu_to_le16(
+ ep93xx_pata_read_data(
+ drv_data, IDECTRL_ADDR_DATA));
+ else
+ ep93xx_pata_write_data(drv_data, le16_to_cpu(*data++),
+ IDECTRL_ADDR_DATA);
+
+ /* Transfer trailing 1 byte, if any. */
+ if (unlikely(buflen & 0x01)) {
+ unsigned char pad[2] = { };
+
+ buf += buflen - 1;
+
+ if (rw == READ) {
+ *pad = cpu_to_le16(
+ ep93xx_pata_read_data(
+ drv_data, IDECTRL_ADDR_DATA));
+ *buf = pad[0];
+ } else {
+ pad[0] = *buf;
+ ep93xx_pata_write_data(drv_data, le16_to_cpu(*pad),
+ IDECTRL_ADDR_DATA);
+ }
+ words++;
+ }
+
+ return words << 1;
+}
+
+/* Note: original code is ata_devchk */
+static bool ep93xx_pata_device_is_present(struct ata_port *ap,
+ unsigned int device)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ u8 nsect, lbal;
+
+ ap->ops->sff_dev_select(ap, device);
+
+ ep93xx_pata_write_reg(drv_data, 0x55, IDECTRL_ADDR_NSECT);
+ ep93xx_pata_write_reg(drv_data, 0xaa, IDECTRL_ADDR_LBAL);
+
+ ep93xx_pata_write_reg(drv_data, 0xaa, IDECTRL_ADDR_NSECT);
+ ep93xx_pata_write_reg(drv_data, 0x55, IDECTRL_ADDR_LBAL);
+
+ ep93xx_pata_write_reg(drv_data, 0x55, IDECTRL_ADDR_NSECT);
+ ep93xx_pata_write_reg(drv_data, 0xaa, IDECTRL_ADDR_LBAL);
+
+ nsect = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_NSECT);
+ lbal = ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_LBAL);
+
+ if ((nsect == 0x55) && (lbal == 0xaa))
+ return true;
+
+ return false;
+}
+
+/* Note: original code is ata_sff_wait_after_reset */
+static int ep93xx_pata_wait_after_reset(struct ata_link *link,
+ unsigned int devmask,
+ unsigned long deadline)
+{
+ struct ata_port *ap = link->ap;
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ unsigned int dev0 = devmask & (1 << 0);
+ unsigned int dev1 = devmask & (1 << 1);
+ int rc, ret = 0;
+
+ ata_msleep(ap, ATA_WAIT_AFTER_RESET);
+
+ /* always check readiness of the master device */
+ rc = ata_sff_wait_ready(link, deadline);
+ /*
+ * -ENODEV means the odd clown forgot the D7 pulldown resistor
+ * and TF status is 0xff, bail out on it too.
+ */
+ if (rc)
+ return rc;
+
+ /*
+ * if device 1 was found in ata_devchk, wait for register
+ * access briefly, then wait for BSY to clear.
+ */
+ if (dev1) {
+ int i;
+
+ ap->ops->sff_dev_select(ap, 1);
+
+ /*
+ * Wait for register access. Some ATAPI devices fail
+ * to set nsect/lbal after reset, so don't waste too
+ * much time on it. We're gonna wait for !BSY anyway.
+ */
+ for (i = 0; i < 2; i++) {
+ u8 nsect, lbal;
+
+ nsect = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_NSECT);
+ lbal = ep93xx_pata_read_reg(drv_data,
+ IDECTRL_ADDR_LBAL);
+ if (nsect == 1 && lbal == 1)
+ break;
+ msleep(50); /* give drive a breather */
+ }
+
+ rc = ata_sff_wait_ready(link, deadline);
+ if (rc) {
+ if (rc != -ENODEV)
+ return rc;
+ ret = rc;
+ }
+ }
+ /* is all this really necessary? */
+ ap->ops->sff_dev_select(ap, 0);
+ if (dev1)
+ ap->ops->sff_dev_select(ap, 1);
+ if (dev0)
+ ap->ops->sff_dev_select(ap, 0);
+
+ return ret;
+}
+
+/* Note: original code is ata_bus_softreset */
+static int ep93xx_pata_bus_softreset(struct ata_port *ap, unsigned int devmask,
+ unsigned long deadline)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ ep93xx_pata_write_reg(drv_data, ap->ctl, IDECTRL_ADDR_CTL);
+ udelay(20); /* FIXME: flush */
+ ep93xx_pata_write_reg(drv_data, ap->ctl | ATA_SRST, IDECTRL_ADDR_CTL);
+ udelay(20); /* FIXME: flush */
+ ep93xx_pata_write_reg(drv_data, ap->ctl, IDECTRL_ADDR_CTL);
+ ap->last_ctl = ap->ctl;
+
+ return ep93xx_pata_wait_after_reset(&ap->link, devmask, deadline);
+}
+
+static void ep93xx_pata_release_dma(struct ep93xx_pata_data *drv_data)
+{
+ if (drv_data->dma_rx_channel) {
+ dma_release_channel(drv_data->dma_rx_channel);
+ drv_data->dma_rx_channel = NULL;
+ }
+ if (drv_data->dma_tx_channel) {
+ dma_release_channel(drv_data->dma_tx_channel);
+ drv_data->dma_tx_channel = NULL;
+ }
+}
+
+static bool ep93xx_pata_dma_filter(struct dma_chan *chan, void *filter_param)
+{
+ if (ep93xx_dma_chan_is_m2p(chan))
+ return false;
+
+ chan->private = filter_param;
+ return true;
+}
+
+static void ep93xx_pata_dma_init(struct ep93xx_pata_data *drv_data)
+{
+ const struct platform_device *pdev = drv_data->pdev;
+ dma_cap_mask_t mask;
+ struct dma_slave_config conf;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ /*
+ * Request two channels for IDE. Another possibility would be
+ * to request only one channel, and reprogram it's direction at
+ * start of new transfer.
+ */
+ drv_data->dma_rx_data.port = EP93XX_DMA_IDE;
+ drv_data->dma_rx_data.direction = DMA_FROM_DEVICE;
+ drv_data->dma_rx_data.name = "ep93xx-pata-rx";
+ drv_data->dma_rx_channel = dma_request_channel(mask,
+ ep93xx_pata_dma_filter, &drv_data->dma_rx_data);
+ if (!drv_data->dma_rx_channel)
+ return;
+
+ drv_data->dma_tx_data.port = EP93XX_DMA_IDE;
+ drv_data->dma_tx_data.direction = DMA_TO_DEVICE;
+ drv_data->dma_tx_data.name = "ep93xx-pata-tx";
+ drv_data->dma_tx_channel = dma_request_channel(mask,
+ ep93xx_pata_dma_filter, &drv_data->dma_tx_data);
+ if (!drv_data->dma_tx_channel) {
+ dma_release_channel(drv_data->dma_rx_channel);
+ return;
+ }
+
+ /* Configure receive channel direction and source address */
+ memset(&conf, 0, sizeof(conf));
+ conf.direction = DMA_FROM_DEVICE;
+ conf.src_addr = drv_data->udma_in_phys;
+ conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ if (dmaengine_slave_config(drv_data->dma_rx_channel, &conf)) {
+ dev_err(&pdev->dev, "failed to configure rx dma channel\n");
+ ep93xx_pata_release_dma(drv_data);
+ return;
+ }
+
+ /* Configure transmit channel direction and destination address */
+ memset(&conf, 0, sizeof(conf));
+ conf.direction = DMA_TO_DEVICE;
+ conf.dst_addr = drv_data->udma_out_phys;
+ conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ if (dmaengine_slave_config(drv_data->dma_tx_channel, &conf)) {
+ dev_err(&pdev->dev, "failed to configure tx dma channel\n");
+ ep93xx_pata_release_dma(drv_data);
+ }
+}
+
+static void ep93xx_pata_dma_start(struct ata_queued_cmd *qc)
+{
+ struct dma_async_tx_descriptor *txd;
+ struct ep93xx_pata_data *drv_data = qc->ap->host->private_data;
+ void __iomem *base = drv_data->ide_base;
+ struct ata_device *adev = qc->dev;
+ u32 v = qc->dma_dir == DMA_TO_DEVICE ? IDEUDMAOP_RWOP : 0;
+ struct dma_chan *channel = qc->dma_dir == DMA_TO_DEVICE
+ ? drv_data->dma_tx_channel : drv_data->dma_rx_channel;
+
+ txd = channel->device->device_prep_slave_sg(channel, qc->sg,
+ qc->n_elem, qc->dma_dir, DMA_CTRL_ACK, NULL);
+ if (!txd) {
+ dev_err(qc->ap->dev, "failed to prepare slave for sg dma\n");
+ return;
+ }
+ txd->callback = NULL;
+ txd->callback_param = NULL;
+
+ if (dmaengine_submit(txd) < 0) {
+ dev_err(qc->ap->dev, "failed to submit dma transfer\n");
+ return;
+ }
+ dma_async_issue_pending(channel);
+
+ /*
+ * When enabling UDMA operation, IDEUDMAOP register needs to be
+ * programmed in three step sequence:
+ * 1) set or clear the RWOP bit,
+ * 2) perform dummy read of the register,
+ * 3) set the UEN bit.
+ */
+ writel(v, base + IDEUDMAOP);
+ readl(base + IDEUDMAOP);
+ writel(v | IDEUDMAOP_UEN, base + IDEUDMAOP);
+
+ writel(IDECFG_IDEEN | IDECFG_UDMA |
+ ((adev->xfer_mode - XFER_UDMA_0) << IDECFG_MODE_SHIFT),
+ base + IDECFG);
+}
+
+static void ep93xx_pata_dma_stop(struct ata_queued_cmd *qc)
+{
+ struct ep93xx_pata_data *drv_data = qc->ap->host->private_data;
+ void __iomem *base = drv_data->ide_base;
+
+ /* terminate all dma transfers, if not yet finished */
+ dmaengine_terminate_all(drv_data->dma_rx_channel);
+ dmaengine_terminate_all(drv_data->dma_tx_channel);
+
+ /*
+ * To properly stop IDE-DMA, IDEUDMAOP register must to be cleared
+ * and IDECTRL register must be set to default value.
+ */
+ writel(0, base + IDEUDMAOP);
+ writel(readl(base + IDECTRL) | IDECTRL_DIOWN | IDECTRL_DIORN |
+ IDECTRL_CS0N | IDECTRL_CS1N, base + IDECTRL);
+
+ ep93xx_pata_enable_pio(drv_data->ide_base,
+ qc->dev->pio_mode - XFER_PIO_0);
+
+ ata_sff_dma_pause(qc->ap);
+}
+
+static void ep93xx_pata_dma_setup(struct ata_queued_cmd *qc)
+{
+ qc->ap->ops->sff_exec_command(qc->ap, &qc->tf);
+}
+
+static u8 ep93xx_pata_dma_status(struct ata_port *ap)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+ u32 val = readl(drv_data->ide_base + IDEUDMASTS);
+
+ /*
+ * UDMA Status Register bits:
+ *
+ * DMAIDE - DMA request signal from UDMA state machine,
+ * INTIDE - INT line generated by UDMA because of errors in the
+ * state machine,
+ * SBUSY - UDMA state machine busy, not in idle state,
+ * NDO - error for data-out not completed,
+ * NDI - error for data-in not completed,
+ * N4X - error for data transferred not multiplies of four
+ * 32-bit words.
+ * (EP93xx UG p27-17)
+ */
+ if (val & IDEUDMASTS_NDO || val & IDEUDMASTS_NDI ||
+ val & IDEUDMASTS_N4X || val & IDEUDMASTS_INTIDE)
+ return ATA_DMA_ERR;
+
+ /* read INTRQ (INT[3]) pin input state */
+ if (readl(drv_data->ide_base + IDECTRL) & IDECTRL_INTRQ)
+ return ATA_DMA_INTR;
+
+ if (val & IDEUDMASTS_SBUSY || val & IDEUDMASTS_DMAIDE)
+ return ATA_DMA_ACTIVE;
+
+ return 0;
+}
+
+/* Note: original code is ata_sff_softreset */
+static int ep93xx_pata_softreset(struct ata_link *al, unsigned int *classes,
+ unsigned long deadline)
+{
+ struct ata_port *ap = al->ap;
+ unsigned int slave_possible = ap->flags & ATA_FLAG_SLAVE_POSS;
+ unsigned int devmask = 0;
+ int rc;
+ u8 err;
+
+ /* determine if device 0/1 are present */
+ if (ep93xx_pata_device_is_present(ap, 0))
+ devmask |= (1 << 0);
+ if (slave_possible && ep93xx_pata_device_is_present(ap, 1))
+ devmask |= (1 << 1);
+
+ /* select device 0 again */
+ ap->ops->sff_dev_select(al->ap, 0);
+
+ /* issue bus reset */
+ rc = ep93xx_pata_bus_softreset(ap, devmask, deadline);
+ /* if link is ocuppied, -ENODEV too is an error */
+ if (rc && (rc != -ENODEV || sata_scr_valid(al))) {
+ ata_link_printk(al, KERN_ERR, "SRST failed (errno=%d)\n",
+ rc);
+ return rc;
+ }
+
+ /* determine by signature whether we have ATA or ATAPI devices */
+ classes[0] = ata_sff_dev_classify(&al->device[0], devmask & (1 << 0),
+ &err);
+ if (slave_possible && err != 0x81)
+ classes[1] = ata_sff_dev_classify(&al->device[1],
+ devmask & (1 << 1), &err);
+
+ return 0;
+}
+
+/* Note: original code is ata_sff_drain_fifo */
+static void ep93xx_pata_drain_fifo(struct ata_queued_cmd *qc)
+{
+ int count;
+ struct ata_port *ap;
+ struct ep93xx_pata_data *drv_data;
+
+ /* We only need to flush incoming data when a command was running */
+ if (qc == NULL || qc->dma_dir == DMA_TO_DEVICE)
+ return;
+
+ ap = qc->ap;
+ drv_data = ap->host->private_data;
+ /* Drain up to 64K of data before we give up this recovery method */
+ for (count = 0; (ap->ops->sff_check_status(ap) & ATA_DRQ)
+ && count < 65536; count += 2)
+ ep93xx_pata_read_reg(drv_data, IDECTRL_ADDR_DATA);
+
+ /* Can become DEBUG later */
+ if (count)
+ ata_port_printk(ap, KERN_DEBUG,
+ "drained %d bytes to clear DRQ.\n", count);
+
+}
+
+static int ep93xx_pata_port_start(struct ata_port *ap)
+{
+ struct ep93xx_pata_data *drv_data = ap->host->private_data;
+
+ /*
+ * Set timings to safe values at startup (= number of ns from ATA
+ * specification), we'll switch to properly calculated values later.
+ */
+ drv_data->t = *ata_timing_find_mode(XFER_PIO_0);
+ return 0;
+}
+
+static struct scsi_host_template ep93xx_pata_sht = {
+ ATA_BASE_SHT(DRV_NAME),
+ /* ep93xx dma implementation limit */
+ .sg_tablesize = 32,
+ /* ep93xx dma can't transfer 65536 bytes at once */
+ .dma_boundary = 0x7fff,
+};
+
+static struct ata_port_operations ep93xx_pata_port_ops = {
+ .inherits = &ata_bmdma_port_ops,
+
+ .qc_prep = ata_noop_qc_prep,
+
+ .softreset = ep93xx_pata_softreset,
+ .hardreset = ATA_OP_NULL,
+
+ .sff_dev_select = ep93xx_pata_dev_select,
+ .sff_set_devctl = ep93xx_pata_set_devctl,
+ .sff_check_status = ep93xx_pata_check_status,
+ .sff_check_altstatus = ep93xx_pata_check_altstatus,
+ .sff_tf_load = ep93xx_pata_tf_load,
+ .sff_tf_read = ep93xx_pata_tf_read,
+ .sff_exec_command = ep93xx_pata_exec_command,
+ .sff_data_xfer = ep93xx_pata_data_xfer,
+ .sff_drain_fifo = ep93xx_pata_drain_fifo,
+ .sff_irq_clear = ATA_OP_NULL,
+
+ .set_piomode = ep93xx_pata_set_piomode,
+
+ .bmdma_setup = ep93xx_pata_dma_setup,
+ .bmdma_start = ep93xx_pata_dma_start,
+ .bmdma_stop = ep93xx_pata_dma_stop,
+ .bmdma_status = ep93xx_pata_dma_status,
+
+ .cable_detect = ata_cable_unknown,
+ .port_start = ep93xx_pata_port_start,
+};
+
+static int __devinit ep93xx_pata_probe(struct platform_device *pdev)
+{
+ struct ep93xx_pata_data *drv_data;
+ struct ata_host *host;
+ struct ata_port *ap;
+ unsigned int irq;
+ struct resource *mem_res;
+ void __iomem *ide_base;
+ int err;
+
+ err = ep93xx_ide_acquire_gpio(pdev);
+ if (err)
+ return err;
+
+ /* INT[3] (IRQ_EP93XX_EXT3) line connected as pull down */
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ err = -ENXIO;
+ goto err_rel_gpio;
+ }
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!mem_res) {
+ err = -ENXIO;
+ goto err_rel_gpio;
+ }
+
+ ide_base = devm_request_and_ioremap(&pdev->dev, mem_res);
+ if (!ide_base) {
+ err = -ENXIO;
+ goto err_rel_gpio;
+ }
+
+ drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
+ if (!drv_data) {
+ err = -ENXIO;
+ goto err_rel_gpio;
+ }
+
+ platform_set_drvdata(pdev, drv_data);
+ drv_data->pdev = pdev;
+ drv_data->ide_base = ide_base;
+ drv_data->udma_in_phys = mem_res->start + IDEUDMADATAIN;
+ drv_data->udma_out_phys = mem_res->start + IDEUDMADATAOUT;
+ ep93xx_pata_dma_init(drv_data);
+
+ /* allocate host */
+ host = ata_host_alloc(&pdev->dev, 1);
+ if (!host) {
+ err = -ENXIO;
+ goto err_rel_dma;
+ }
+
+ ep93xx_pata_clear_regs(ide_base);
+
+ host->private_data = drv_data;
+
+ ap = host->ports[0];
+ ap->dev = &pdev->dev;
+ ap->ops = &ep93xx_pata_port_ops;
+ ap->flags |= ATA_FLAG_SLAVE_POSS;
+ ap->pio_mask = ATA_PIO4;
+
+ /*
+ * Maximum UDMA modes:
+ * EP931x rev.E0 - UDMA2
+ * EP931x rev.E1 - UDMA3
+ * EP931x rev.E2 - UDMA4
+ *
+ * MWDMA support was removed from EP931x rev.E2,
+ * so this driver supports only UDMA modes.
+ */
+ if (drv_data->dma_rx_channel && drv_data->dma_tx_channel) {
+ int chip_rev = ep93xx_chip_revision();
+
+ if (chip_rev == EP93XX_CHIP_REV_E1)
+ ap->udma_mask = ATA_UDMA3;
+ else if (chip_rev == EP93XX_CHIP_REV_E2)
+ ap->udma_mask = ATA_UDMA4;
+ else
+ ap->udma_mask = ATA_UDMA2;
+ }
+
+ /* defaults, pio 0 */
+ ep93xx_pata_enable_pio(ide_base, 0);
+
+ dev_info(&pdev->dev, "version " DRV_VERSION "\n");
+
+ /* activate host */
+ err = ata_host_activate(host, irq, ata_bmdma_interrupt, 0,
+ &ep93xx_pata_sht);
+ if (err == 0)
+ return 0;
+
+err_rel_dma:
+ ep93xx_pata_release_dma(drv_data);
+err_rel_gpio:
+ ep93xx_ide_release_gpio(pdev);
+ return err;
+}
+
+static int __devexit ep93xx_pata_remove(struct platform_device *pdev)
+{
+ struct ata_host *host = platform_get_drvdata(pdev);
+ struct ep93xx_pata_data *drv_data = host->private_data;
+
+ ata_host_detach(host);
+ ep93xx_pata_release_dma(drv_data);
+ ep93xx_pata_clear_regs(drv_data->ide_base);
+ ep93xx_ide_release_gpio(pdev);
+ return 0;
+}
+
+static struct platform_driver ep93xx_pata_platform_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = ep93xx_pata_probe,
+ .remove = __devexit_p(ep93xx_pata_remove),
+};
+
+module_platform_driver(ep93xx_pata_platform_driver);
+
+MODULE_AUTHOR("Alessandro Zummo, Lennert Buytenhek, Joao Ramos, "
+ "Bartlomiej Zolnierkiewicz, Rafal Prylowski");
+MODULE_DESCRIPTION("low-level driver for cirrus ep93xx IDE controller");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:pata_ep93xx");
Index: linux-2.6/drivers/ata/Kconfig
===================================================================
--- linux-2.6.orig/drivers/ata/Kconfig
+++ linux-2.6/drivers/ata/Kconfig
@@ -416,6 +416,15 @@ config PATA_EFAR
If unsure, say N.
+config PATA_EP93XX
+ tristate "Cirrus Logic EP93xx PATA support"
+ depends on ARCH_EP93XX
+ help
+ This option enables support for the PATA controller in
+ the Cirrus Logic EP9312 and EP9315 ARM CPU.
+
+ If unsure, say N.
+
config PATA_HPT366
tristate "HPT 366/368 PATA support"
depends on PCI
Index: linux-2.6/drivers/ata/Makefile
===================================================================
--- linux-2.6.orig/drivers/ata/Makefile
+++ linux-2.6/drivers/ata/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_PATA_CS5535) += pata_cs5535
obj-$(CONFIG_PATA_CS5536) += pata_cs5536.o
obj-$(CONFIG_PATA_CYPRESS) += pata_cypress.o
obj-$(CONFIG_PATA_EFAR) += pata_efar.o
+obj-$(CONFIG_PATA_EP93XX) += pata_ep93xx.o
obj-$(CONFIG_PATA_HPT366) += pata_hpt366.o
obj-$(CONFIG_PATA_HPT37X) += pata_hpt37x.o
obj-$(CONFIG_PATA_HPT3X2N) += pata_hpt3x2n.o
More information about the linux-arm-kernel
mailing list