[PATCH 12/13] ATA Disk Support: Add support for native ATA type drives
Juergen Beisert
jbe at pengutronix.de
Fri Nov 25 09:36:17 EST 2011
This changed patch removes more of the u-boot like code and replace it with
kernel like code.
commit 2a8966936af6b54573483ade559d0633e489b515
Author: Juergen Beisert <jbe at pengutronix.de>
Date: Fri Sep 30 15:06:26 2011 +0200
ATA Disk Support: Add support for native ATA type drives
Signed-off-by: Juergen Beisert <jbe at pengutronix.de>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 86b5673..f4334c2 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -24,6 +24,12 @@ config DISK_BIOS
media to work on. Disadvantage is: Due to its 16 bit nature it is
slow.
+config DISK_ATA
+ bool "ATA type drives"
+ select DISK_DRIVE
+ help
+ Support for native ATA/IDE drives
+
comment "interface types"
endif
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index e2b41b7..cdbcbe7 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -1,6 +1,7 @@
# drive types
obj-$(CONFIG_DISK_BIOS) += disk_bios_drive.o
+obj-$(CONFIG_DISK_ATA) += disk_ata_drive.o
# interface types
diff --git a/drivers/ata/disk_ata_drive.c b/drivers/ata/disk_ata_drive.c
new file mode 100644
index 0000000..4602af3
--- /dev/null
+++ b/drivers/ata/disk_ata_drive.c
@@ -0,0 +1,618 @@
+/*
+ * Copyright (C) 2011 Juergen Beisert, Pengutronix
+ *
+ * Inspired from various soures like http://wiki.osdev.org/ATA_PIO_Mode,
+ * u-boot and the linux kernel
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <xfuncs.h>
+#include <io.h>
+#include <malloc.h>
+#include <errno.h>
+#include <clock.h>
+#include <block.h>
+#include <ata_drive.h>
+#include <disks.h>
+
+#define ATA_CMD_ID_DEVICE 0xEC
+#define ATA_CMD_RD_CONF 0x40
+#define ATA_CMD_RD 0x20
+#define ATA_CMD_WR 0x30
+
+#define DISK_MASTER 0
+#define DISK_SLAVE 1
+
+/* max timeout for a rotating disk in [ms] */
+#define MAX_TIMEOUT 5000
+
+/**
+ * Collection of data we need to know about this drive
+ */
+struct ata_drive_access {
+ struct block_device blk; /**< the main device */
+ struct ata_ioports *io; /**< register file */
+ uint16_t id[(SECTOR_SIZE / sizeof(uint16_t))];
+};
+
+#define to_ata_drive_access(x) container_of((x), struct ata_drive_access, blk)
+
+#define ata_id_u32(id,n) \
+ (((uint32_t) (id)[(n) + 1] << 16) | ((uint32_t) (id)[(n)]))
+#define ata_id_u64(id,n) \
+ ( ((uint64_t) (id)[(n) + 3] << 48) | \
+ ((uint64_t) (id)[(n) + 2] << 32) | \
+ ((uint64_t) (id)[(n) + 1] << 16) | \
+ ((uint64_t) (id)[(n) + 0]) )
+
+#define ata_id_has_lba(id) ((id)[49] & (1 << 9))
+
+/* drive's status flags */
+#define ATA_STATUS_BUSY (1 << 7)
+#define ATA_STATUS_READY (1 << 6)
+#define ATA_STATUS_WR_FLT (1 << 5)
+#define ATA_STATUS_DRQ (1 << 4)
+#define ATA_STATUS_CORR (1 << 3)
+#define ATA_STATUS_ERROR (1 << 1)
+/* command flags */
+#define LBA_FLAG (1 << 6)
+#define ATA_DEVCTL_SOFT_RESET (1 << 2)
+#define ATA_DEVCTL_INTR_DISABLE (1 << 1)
+
+enum {
+ ATA_ID_SERNO = 10,
+#define ATA_ID_SERNO_LEN 20
+ ATA_ID_FW_REV = 23,
+#define ATA_ID_FW_REV_LEN 8
+ ATA_ID_PROD = 27,
+#define ATA_ID_PROD_LEN 40
+ ATA_ID_CAPABILITY = 49,
+ ATA_ID_FIELD_VALID = 53,
+ ATA_ID_LBA_CAPACITY = 60,
+ ATA_ID_MWDMA_MODES = 63,
+ ATA_ID_PIO_MODES = 64,
+ ATA_ID_QUEUE_DEPTH = 75,
+ ATA_ID_MAJOR_VER = 80,
+ ATA_ID_COMMAND_SET_1 = 82,
+ ATA_ID_COMMAND_SET_2 = 83,
+ ATA_ID_CFSSE = 84,
+ ATA_ID_CFS_ENABLE_1 = 85,
+ ATA_ID_CFS_ENABLE_2 = 86,
+ ATA_ID_CSF_DEFAULT = 87,
+ ATA_ID_UDMA_MODES = 88,
+ ATA_ID_HW_CONFIG = 93,
+ ATA_ID_LBA_CAPACITY_2 = 100,
+};
+
+static int ata_id_is_valid(const uint16_t *id)
+{
+ if ((id[ATA_ID_FIELD_VALID] & 1) == 0) {
+ pr_debug("Drive's ID seems invalid\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static inline int ata_id_has_lba48(const uint16_t *id)
+{
+ if ((id[ATA_ID_COMMAND_SET_2] & 0xC000) != 0x4000)
+ return 0;
+ if (!ata_id_u64(id, ATA_ID_LBA_CAPACITY_2))
+ return 0;
+ return id[ATA_ID_COMMAND_SET_2] & (1 << 10);
+}
+
+static uint64_t ata_id_n_sectors(uint16_t *id)
+{
+ if (ata_id_has_lba(id)) {
+ if (ata_id_has_lba48(id))
+ return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
+ else
+ return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
+ }
+
+ return 0;
+}
+
+static void ata_id_string(const uint16_t *id, unsigned char *s,
+ unsigned ofs, unsigned len)
+{
+ unsigned c;
+
+ while (len > 0) {
+ c = id[ofs] >> 8;
+ *s = c;
+ s++;
+
+ c = id[ofs] & 0xff;
+ *s = c;
+ s++;
+
+ ofs++;
+ len -= 2;
+ }
+}
+
+static void ata_id_c_string(const uint16_t *id, unsigned char *s,
+ unsigned ofs, unsigned len)
+{
+ unsigned char *p;
+
+ ata_id_string(id, s, ofs, len - 1);
+
+ p = s + strnlen((char *)s, len - 1);
+ while (p > s && p[-1] == ' ')
+ p--;
+ *p = '\0';
+}
+
+static void __maybe_unused ata_dump_id(uint16_t *id)
+{
+ unsigned char serial[ATA_ID_SERNO_LEN + 1];
+ unsigned char firmware[ATA_ID_FW_REV_LEN + 1];
+ unsigned char product[ATA_ID_PROD_LEN + 1];
+ uint64_t n_sectors;
+
+ /* Serial number */
+ ata_id_c_string(id, serial, ATA_ID_SERNO, sizeof(serial));
+ printf("S/N: %s\n\r", serial);
+
+ /* Firmware version */
+ ata_id_c_string(id, firmware, ATA_ID_FW_REV, sizeof(firmware));
+ printf("Firmware version: %s\n\r", firmware);
+
+ /* Product model */
+ ata_id_c_string(id, product, ATA_ID_PROD, sizeof(product));
+ printf("Product model number: %s\n\r", product);
+
+ /* Total sectors of device */
+ n_sectors = ata_id_n_sectors(id);
+ printf("Capablity: %lld sectors\n\r", n_sectors);
+
+ printf ("id[49]: capabilities = 0x%04x\n"
+ "id[53]: field valid = 0x%04x\n"
+ "id[63]: mwdma = 0x%04x\n"
+ "id[64]: pio = 0x%04x\n"
+ "id[75]: queue depth = 0x%04x\n",
+ id[ATA_ID_CAPABILITY],
+ id[ATA_ID_FIELD_VALID],
+ id[ATA_ID_MWDMA_MODES],
+ id[ATA_ID_PIO_MODES],
+ id[ATA_ID_QUEUE_DEPTH]);
+
+ printf ("id[76]: sata capablity = 0x%04x\n"
+ "id[78]: sata features supported = 0x%04x\n"
+ "id[79]: sata features enable = 0x%04x\n",
+ id[76], /* FIXME */
+ id[78], /* FIXME */
+ id[79]); /* FIXME */
+
+ printf ("id[80]: major version = 0x%04x\n"
+ "id[81]: minor version = 0x%04x\n"
+ "id[82]: command set supported 1 = 0x%04x\n"
+ "id[83]: command set supported 2 = 0x%04x\n"
+ "id[84]: command set extension = 0x%04x\n",
+ id[ATA_ID_MAJOR_VER],
+ id[81], /* FIXME */
+ id[ATA_ID_COMMAND_SET_1],
+ id[ATA_ID_COMMAND_SET_2],
+ id[ATA_ID_CFSSE]);
+ printf ("id[85]: command set enable 1 = 0x%04x\n"
+ "id[86]: command set enable 2 = 0x%04x\n"
+ "id[87]: command set default = 0x%04x\n"
+ "id[88]: udma = 0x%04x\n"
+ "id[93]: hardware reset result = 0x%04x\n",
+ id[ATA_ID_CFS_ENABLE_1],
+ id[ATA_ID_CFS_ENABLE_2],
+ id[ATA_ID_CSF_DEFAULT],
+ id[ATA_ID_UDMA_MODES],
+ id[ATA_ID_HW_CONFIG]);
+}
+
+/**
+ * Swap little endian data on demand
+ * @param buf Buffer with little endian word data
+ * @param wds 16 bit word count
+ *
+ * ATA disks report their ID data in little endian notation on a 16 bit word
+ * base. So swap the buffer content if the running CPU differs in their
+ * endiaeness.
+ */
+static void ata_fix_endianess(uint16_t *buf, unsigned wds)
+{
+#if __BYTE_ORDER == __BIG_ENDIAN
+ unsigned u;
+
+ for (u = 0; u < wds; u++)
+ buf[u] = le16_to_cpu(buf[u]);
+#endif
+}
+
+/**
+ * Read the status register of the ATA drive
+ * @param io Register file
+ * @return Register's content
+ */
+static uint8_t ata_rd_status(struct ata_ioports *io)
+{
+ return readb(io->status_addr);
+}
+
+/**
+ * Wait until the disk is busy or time out
+ * @param io Register file
+ * @param timeout Timeout in [ms]
+ * @return 0 on success, -ETIMEDOUT else
+ */
+static int ata_wait_busy(struct ata_ioports *io, unsigned timeout)
+{
+ uint8_t status;
+ uint64_t start = get_time_ns();
+ uint64_t toffs = timeout * 1000 * 1000;
+
+ do {
+ status = ata_rd_status(io);
+ if (status & ATA_STATUS_BUSY)
+ return 0;
+ } while (!is_timeout(start, toffs));
+
+ return -ETIMEDOUT;
+}
+
+/**
+ * Wait until the disk is ready again or time out
+ * @param io Register file
+ * @param timeout Timeout in [ms]
+ * @return 0 on success, -ETIMEDOUT else
+ *
+ * This function is useful to check if the disk has accepted a command.
+ */
+static int ata_wait_ready(struct ata_ioports *io, unsigned timeout)
+{
+ uint8_t status;
+ uint64_t start = get_time_ns();
+ uint64_t toffs = timeout * 1000 * 1000;
+
+ do {
+ status = ata_rd_status(io);
+ if (!(status & ATA_STATUS_BUSY)) {
+ if (status & ATA_STATUS_READY)
+ return 0;
+ }
+ } while (!is_timeout(start, toffs));
+
+ return -ETIMEDOUT;
+}
+
+/**
+ * Setup the sector number in LBA notation (LBA28)
+ * @param io Register file
+ * @param drive 0 master drive, 1 slave drive
+ * @param num Sector number
+ *
+ * @todo LBA48 support
+ */
+static int ata_set_lba_sector(struct ata_ioports *io, unsigned drive, uint64_t num)
+{
+ if (num > 0x0FFFFFFF || drive > 1)
+ return -EINVAL;
+
+ writeb(0xA0 | LBA_FLAG | drive << 4 | num >> 24, io->device_addr);
+ writeb(0x00, io->error_addr);
+ writeb(0x01, io->nsect_addr);
+ writeb(num, io->lbal_addr); /* 0 ... 7 */
+ writeb(num >> 8, io->lbam_addr); /* 8 ... 15 */
+ writeb(num >> 16, io->lbah_addr); /* 16 ... 23 */
+
+ return 0;
+}
+
+/**
+ * Write an ATA command into the disk
+ * @param io Register file
+ * @param cmd Command to write
+ * @return 0 on success
+ */
+static int ata_wr_cmd(struct ata_ioports *io, uint8_t cmd)
+{
+ int rc;
+
+ rc = ata_wait_ready(io, MAX_TIMEOUT);
+ if (rc != 0)
+ return rc;
+
+ writeb(cmd, io->command_addr);
+ return 0;
+}
+
+/**
+ * Write a new value into the "device control register"
+ * @param io Register file
+ * @param val Value to write
+ */
+static void ata_wr_dev_ctrl(struct ata_ioports *io, uint8_t val)
+{
+ writeb(val, io->ctl_addr);
+}
+
+/**
+ * Read one sector from the drive (always SECTOR_SIZE bytes at once)
+ * @param io Register file
+ * @param buf Buffer to read the data into
+ */
+static void ata_rd_sector(struct ata_ioports *io, void *buf)
+{
+ unsigned u = SECTOR_SIZE / sizeof(uint16_t);
+ uint16_t *b = buf;
+
+ if (io->dataif_be) {
+ for (; u > 0; u--)
+ *b++ = be16_to_cpu(readw(io->data_addr));
+ } else {
+ for (; u > 0; u--)
+ *b++ = le16_to_cpu(readw(io->data_addr));
+ }
+}
+
+/**
+ * Write one sector into the drive
+ * @param io Register file
+ * @param buf Buffer to read the data from
+ */
+static void ata_wr_sector(struct ata_ioports *io, const void *buf)
+{
+ unsigned u = SECTOR_SIZE / sizeof(uint16_t);
+ const uint16_t *b = buf;
+
+ if (io->dataif_be) {
+ for (; u > 0; u--)
+ writew(cpu_to_be16(*b++), io->data_addr);
+ } else {
+ for (; u > 0; u--)
+ writew(cpu_to_le16(*b++), io->data_addr);
+ }
+}
+
+/**
+ * Read the ATA disk's description info
+ * @param d All we need to know about the disk
+ * @return 0 on success
+ */
+static int ata_get_id(struct ata_drive_access *d)
+{
+ int rc;
+
+ writeb(0xA0, d->io->device_addr); /* FIXME drive */
+ writeb(0x00, d->io->lbal_addr);
+ writeb(0x00, d->io->lbam_addr);
+ writeb(0x00, d->io->lbah_addr);
+
+ rc = ata_wr_cmd(d->io, ATA_CMD_ID_DEVICE);
+ if (rc != 0)
+ return rc;
+
+ rc = ata_wait_ready(d->io, MAX_TIMEOUT);
+ if (rc != 0)
+ return rc;
+
+ ata_rd_sector(d->io, &d->id);
+
+ ata_fix_endianess(d->id, SECTOR_SIZE / sizeof(uint16_t));
+
+ return ata_id_is_valid(d->id);
+}
+
+static int ata_reset(struct ata_ioports *io)
+{
+ int rc;
+ uint8_t reg;
+
+ /* try a hard reset first (if available) */
+ if (io->reset != NULL) {
+ pr_debug("%s: Resetting drive...\n", __func__);
+ io->reset(1);
+ rc = ata_wait_busy(io, 500);
+ io->reset(0);
+ if (rc == 0) {
+ rc = ata_wait_ready(io, MAX_TIMEOUT);
+ if (rc != 0)
+ return rc;
+ } else {
+ pr_debug("%s: Drive does not respond to RESET line. Ignored\n",
+ __func__);
+ }
+ }
+
+ /* try a soft reset */
+ ata_wr_dev_ctrl(io, ATA_DEVCTL_SOFT_RESET | ATA_DEVCTL_INTR_DISABLE);
+ rc = ata_wait_busy(io, MAX_TIMEOUT); /* does the drive accept the command? */
+ if (rc != 0) {
+ pr_debug("%s: Drive fails on soft reset\n", __func__);
+ return rc;
+ }
+ ata_wr_dev_ctrl(io, ATA_DEVCTL_INTR_DISABLE);
+ rc = ata_wait_ready(io, MAX_TIMEOUT);
+ if (rc != 0) {
+ pr_debug("%s: Drive fails after soft reset\n", __func__);
+ return rc;
+ }
+
+ reg = ata_rd_status(io) & 0xf;
+
+ if (reg == 0xf) {
+ pr_debug("%s: Seems no drive connected!\n", __func__);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+/**
+ * Read a chunk of sectors from the drive
+ * @param blk All info about the block device we need
+ * @param buffer Buffer to read into
+ * @param block Sector's LBA number to start read from
+ * @param num_blocks Sector count to read
+ * @return 0 on success, anything else on failure
+ *
+ * This routine expects the buffer has the correct size to store all data!
+ *
+ * @note Due to 'block' is of type 'int' only small disks can be handled!
+ * @todo Optimize the read loop
+ */
+static int ata_read(struct block_device *blk, void *buffer, int block,
+ int num_blocks)
+{
+ int rc;
+ uint64_t sector = block;
+ struct ata_drive_access *drv = to_ata_drive_access(blk);
+
+ while (num_blocks) {
+ rc = ata_set_lba_sector(drv->io, DISK_MASTER, sector);
+ if (rc != 0)
+ return rc;
+ rc = ata_wr_cmd(drv->io, ATA_CMD_RD);
+ if (rc != 0)
+ return rc;
+ rc = ata_wait_ready(drv->io, MAX_TIMEOUT);
+ if (rc != 0)
+ return rc;
+ ata_rd_sector(drv->io, buffer);
+ num_blocks--;
+ sector++;
+ buffer += SECTOR_SIZE;
+ }
+
+ return 0;
+}
+
+/**
+ * Write a chunk of sectors into the drive
+ * @param blk All info about the block device we need
+ * @param buffer Buffer to write from
+ * @param block Sector's number to start write to
+ * @param num_blocks Sector count to write
+ * @return 0 on success, anything else on failure
+ *
+ * This routine expects the buffer has the correct size to read all data!
+ *
+ * @note Due to 'block' is of type 'int' only small disks can be handled!
+ * @todo Optimize the write loop
+ */
+static int __maybe_unused ata_write(struct block_device *blk,
+ const void *buffer, int block, int num_blocks)
+{
+ int rc;
+ uint64_t sector = block;
+ struct ata_drive_access *drv = to_ata_drive_access(blk);
+
+ while (num_blocks) {
+ rc = ata_set_lba_sector(drv->io, DISK_MASTER, sector);
+ if (rc != 0)
+ return rc;
+ rc = ata_wr_cmd(drv->io, ATA_CMD_WR);
+ if (rc != 0)
+ return rc;
+ ata_wr_sector(drv->io, buffer);
+ num_blocks--;
+ sector++;
+ buffer += SECTOR_SIZE;
+ }
+
+ return 0;
+}
+
+static struct block_device_ops ata_ops = {
+ .read = ata_read,
+#ifdef CONFIG_BLOCK_WRITE
+ .write = ata_write,
+#endif
+};
+
+/* until Barebox can handle 64 bit offsets */
+static int limit_disk_size(uint64_t val)
+{
+ if (val > (__INT_MAX__ / SECTOR_SIZE))
+ return (__INT_MAX__ / SECTOR_SIZE);
+ return (int)val;
+}
+
+/**
+ * Register an ATA drive behind an IDE like interface
+ * @param dev The interface device
+ * @param io ATA register file description
+ * @return 0 on success
+ */
+int register_ata_drive(struct device_d *dev, struct ata_ioports *io)
+{
+ int rc;
+ struct ata_drive_access *drive;
+
+ drive = xzalloc(sizeof(struct ata_drive_access));
+
+ drive->io = io;
+ drive->blk.dev = dev;
+ drive->blk.ops = &ata_ops;
+
+ rc = ata_reset(io);
+ if (rc) {
+ dev_dbg(dev, "Resetting failed\n");
+ goto on_error;
+ }
+
+ rc = ata_get_id(drive);
+ if (rc != 0) {
+ dev_dbg(dev, "Reading ID failed\n");
+ goto on_error;
+ }
+
+#ifdef DEBUG
+ ata_dump_id(drive->id);
+#endif
+ rc = cdev_find_free_index("disk");
+ if (rc == -1)
+ pr_err("Cannot find a free index for the disk node\n");
+
+ drive->blk.num_blocks = limit_disk_size(ata_id_n_sectors(drive->id));
+ drive->blk.cdev.name = asprintf("disk%d", rc);
+ drive->blk.blockbits = SECTOR_SHIFT;
+
+ rc = blockdevice_register(&drive->blk);
+ if (rc != 0) {
+ dev_err(dev, "Failed to register blockdevice\n");
+ goto on_error;
+ }
+
+ /* create partitions on demand */
+ rc = parse_partition_table(&drive->blk);
+ if (rc != 0)
+ dev_warn(dev, "No partition table found\n");
+
+ return 0;
+
+on_error:
+ free(drive);
+ return rc;
+}
+
+/**
+ * @file
+ * @brief Generic ATA disk drive support
+ *
+ * Please be aware: This driver covers only a subset of the available ATA drives
+ *
+ * @todo Support for disks larger than 4 GiB
+ * @todo LBA48
+ * @todo CHS
+ */
diff --git a/include/ata_drive.h b/include/ata_drive.h
new file mode 100644
index 0000000..cdd8049
--- /dev/null
+++ b/include/ata_drive.h
@@ -0,0 +1,100 @@
+/*
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef ATA_DISK_H
+# define ATA_DISK
+
+/* IDE register file */
+#define IDE_REG_DATA 0x00
+#define IDE_REG_ERR 0x01
+#define IDE_REG_NSECT 0x02
+#define IDE_REG_LBAL 0x03
+#define IDE_REG_LBAM 0x04
+#define IDE_REG_LBAH 0x05
+#define IDE_REG_DEVICE 0x06
+#define IDE_REG_STATUS 0x07
+
+#define IDE_REG_FEATURE IDE_REG_ERR /* and their aliases */
+#define IDE_REG_CMD IDE_REG_STATUS
+
+#define IDE_REG_ALT_STATUS 0x00
+#define IDE_REG_DEV_CTL 0x00
+#define IDE_REG_DRV_ADDR 0x01
+
+/** addresses of each individual IDE drive register */
+struct ata_ioports {
+ void __iomem *cmd_addr;
+ void __iomem *data_addr;
+ void __iomem *error_addr;
+ void __iomem *feature_addr;
+ void __iomem *nsect_addr;
+ void __iomem *lbal_addr;
+ void __iomem *lbam_addr;
+ void __iomem *lbah_addr;
+ void __iomem *device_addr;
+ void __iomem *status_addr;
+ void __iomem *command_addr;
+ void __iomem *altstatus_addr;
+ void __iomem *ctl_addr;
+ void __iomem *alt_dev_addr;
+
+ /* hard reset line handling */
+ void (*reset)(int); /* true: assert reset, false: de-assert reset */
+ int dataif_be; /* true if 16 bit data register is big endian */
+};
+
+struct device_d;
+extern int register_ata_drive(struct device_d*, struct ata_ioports*);
+
+/**
+ * @file
+ * @brief Register file examples of generic types of ATA devices
+ *
+ * PC IDE:
+ *
+ * Offset Read Write Note
+ *-----------------------------------------------------------
+ * 0x1f0 data data 16 bit register
+ * 0x1f1 error feature
+ * 0x1f2 sec cnt set cnt
+ * 0x1f3 sec no sec no
+ * 0x1f4 cyl low cyl low
+ * 0x1f5 cyl high cyl high
+ * 0x1f6 head head
+ * 0x1f7 status command
+ * 0x3f6 alt status dev cntrl
+ * 0x3f7 drv addr
+ *
+ * PCMCIA memory mapped:
+ *
+ * Offset Read Write Note
+ *-----------------------------------------------------------
+ * 0x0 data data 16 bit register
+ * 0x1 error feature
+ * 0x2 sec cnt set cnt
+ * 0x3 sec no sec no
+ * 0x4 cyl low cyl low
+ * 0x5 cyl high cyl high
+ * 0x6 head head
+ * 0x7 status command
+ * 0x8 data data 16 bit or 8 bit register (even byte)
+ * 0x9 data data 8 bit register (odd byte)
+ * 0xd error feature dup of offset 1
+ * 0xe alt status dev cntrl
+ * 0xf drv addr
+ * 0x400 data data 16 bit area with 1 kiB in size
+ */
+
+#endif /* ATA_DISK */
--
Pengutronix e.K. | Juergen Beisert |
Linux Solutions for Science and Industry | http://www.pengutronix.de/ |
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