From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by casper.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1RTwtz-0004uK-AB for barebox@lists.infradead.org; Fri, 25 Nov 2011 14:37:23 +0000 Received: from gallifrey.ext.pengutronix.de ([2001:6f8:1178:4:5054:ff:fe8d:eefb] helo=localhost) by metis.ext.pengutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1RTwtj-00063W-JE for barebox@lists.infradead.org; Fri, 25 Nov 2011 15:37:04 +0100 From: Juergen Beisert Date: Fri, 25 Nov 2011 15:36:17 +0100 References: <1322138631-8963-1-git-send-email-jbe@pengutronix.de> <1322138631-8963-13-git-send-email-jbe@pengutronix.de> In-Reply-To: <1322138631-8963-13-git-send-email-jbe@pengutronix.de> MIME-Version: 1.0 Content-Disposition: inline Message-Id: <201111251536.17928.jbe@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: [PATCH 12/13] ATA Disk Support: Add support for native ATA type drives To: barebox@lists.infradead.org This changed patch removes more of the u-boot like code and replace it with kernel like code. commit 2a8966936af6b54573483ade559d0633e489b515 Author: Juergen Beisert Date: Fri Sep 30 15:06:26 2011 +0200 ATA Disk Support: Add support for native ATA type drives Signed-off-by: Juergen Beisert 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#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/ | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox