0,0 → 1,423 |
/* |
* Copyright (c) 2009 Jiri Svoboda |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup bd |
* @{ |
*/ |
|
/** |
* @file |
* @brief ATA disk driver |
* |
* This driver currently works only with CHS addressing and uses PIO. |
* Currently based on the (now obsolete) ANSI X3.221-1994 (ATA-1) standard. |
* At this point only reading is possible, not writing. |
*/ |
|
#include <stdio.h> |
#include <libarch/ddi.h> |
#include <ddi.h> |
#include <ipc/ipc.h> |
#include <ipc/bd.h> |
#include <async.h> |
#include <as.h> |
#include <futex.h> |
#include <devmap.h> |
#include <sys/types.h> |
#include <errno.h> |
|
#define NAME "ata_bd" |
|
enum { |
CTL_READ_START = 0, |
CTL_WRITE_START = 1, |
}; |
|
enum { |
STATUS_FAILURE = 0 |
}; |
|
enum { |
MAX_DISKS = 2 |
}; |
|
typedef union { |
/* Read */ |
struct { |
uint8_t data_port; |
uint8_t error; |
uint8_t sector_count; |
uint8_t sector_number; |
uint8_t cylinder_low; |
uint8_t cylinder_high; |
uint8_t drive_head; |
uint8_t status; |
}; |
|
/* Write */ |
struct { |
uint8_t pad0[7]; |
uint8_t command; |
}; |
} ata_cmd_t; |
|
typedef union { |
/* Read */ |
struct { |
uint8_t pad0[6]; |
uint8_t alt_status; |
uint8_t drive_address; |
}; |
|
/* Write */ |
struct { |
uint8_t pad1[6]; |
uint8_t device_control; |
uint8_t pad2; |
}; |
} ata_ctl_t; |
|
enum devctl_bits { |
DCR_SRST = 0x04, /**< Software Reset */ |
DCR_nIEN = 0x02 /**< Interrupt Enable (negated) */ |
}; |
|
enum status_bits { |
SR_BSY = 0x80, /**< Busy */ |
SR_DRDY = 0x40, /**< Drive Ready */ |
SR_DWF = 0x20, /**< Drive Write Fault */ |
SR_DSC = 0x10, /**< Drive Seek Complete */ |
SR_DRQ = 0x08, /**< Data Request */ |
SR_CORR = 0x04, /**< Corrected Data */ |
SR_IDX = 0x02, /**< Index */ |
SR_ERR = 0x01 /**< Error */ |
}; |
|
enum drive_head_bits { |
DHR_DRV = 0x10 |
}; |
|
enum error_bits { |
ER_BBK = 0x80, /**< Bad Block Detected */ |
ER_UNC = 0x40, /**< Uncorrectable Data Error */ |
ER_MC = 0x20, /**< Media Changed */ |
ER_IDNF = 0x10, /**< ID Not Found */ |
ER_MCR = 0x08, /**< Media Change Request */ |
ER_ABRT = 0x04, /**< Aborted Command */ |
ER_TK0NF = 0x02, /**< Track 0 Not Found */ |
ER_AMNF = 0x01 /**< Address Mark Not Found */ |
}; |
|
static const size_t block_size = 512; |
static size_t comm_size; |
|
static uintptr_t cmd_physical = 0x1f0; |
static uintptr_t ctl_physical = 0x170; |
static ata_cmd_t *cmd; |
static ata_ctl_t *ctl; |
|
static dev_handle_t dev_handle[MAX_DISKS]; |
|
static atomic_t dev_futex = FUTEX_INITIALIZER; |
|
static unsigned heads, cylinders, sectors; |
static uint64_t disk_blocks; |
|
static int ata_bd_init(void); |
static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall); |
static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t offset, off_t size, |
void *buf); |
static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt, |
void *buf); |
|
int main(int argc, char **argv) |
{ |
uint8_t status; |
uint16_t data; |
int i; |
|
printf(NAME ": ATA disk driver\n"); |
|
printf("cmd_physical = 0x%x\n", cmd_physical); |
printf("ctl_physical = 0x%x\n", ctl_physical); |
|
if (ata_bd_init() != EOK) |
return -1; |
|
/* Put drives to reset, disable interrupts. */ |
printf("Reset drives...\n"); |
pio_write_8(&ctl->device_control, DCR_SRST); |
/* printf("wait for busy\n"); |
do { |
status = pio_read_8(&cmd->status); |
} while ((status & SR_BSY) == 0); |
*/ |
async_usleep(100); |
pio_write_8(&ctl->device_control, 0); |
|
do { |
status = pio_read_8(&cmd->status); |
} while ((status & SR_BSY) != 0); |
printf("Done\n"); |
|
printf("Status = 0x%x\n", pio_read_8(&cmd->status)); |
|
printf("Issue drive_identify command\n"); |
pio_write_8(&cmd->drive_head, 0x00); |
async_usleep(100); |
pio_write_8(&cmd->command, 0xEC); |
|
printf("Status = 0x%x\n", pio_read_8(&cmd->status)); |
|
for (i = 0; i < 256; i++) { |
do { |
status = pio_read_8(&cmd->status); |
} while ((status & SR_DRDY) == 0); |
|
data = pio_read_16(&cmd->data_port); |
|
switch (i) { |
case 1: cylinders = data; break; |
case 3: heads = data; break; |
case 6: sectors = data; break; |
} |
} |
|
printf("\n\nStatus = 0x%x\n", pio_read_8(&cmd->status)); |
|
printf("Geometry: %u cylinders, %u heads, %u sectors\n", |
cylinders, heads, sectors); |
disk_blocks = cylinders * heads * sectors; |
|
printf(NAME ": Accepting connections\n"); |
async_manager(); |
|
/* Not reached */ |
return 0; |
} |
|
static int ata_bd_init(void) |
{ |
void *vaddr; |
int rc, i; |
char name[16]; |
|
rc = devmap_driver_register(NAME, ata_bd_connection); |
if (rc < 0) { |
printf(NAME ": Unable to register driver.\n"); |
return rc; |
} |
|
rc = pio_enable((void *) cmd_physical, sizeof(ata_cmd_t), &vaddr); |
if (rc != EOK) { |
printf(NAME ": Could not initialize device I/O space.\n"); |
return rc; |
} |
|
cmd = vaddr; |
|
rc = pio_enable((void *) ctl_physical, sizeof(ata_ctl_t), &vaddr); |
if (rc != EOK) { |
printf(NAME ": Could not initialize device I/O space.\n"); |
return rc; |
} |
|
ctl = vaddr; |
|
for (i = 0; i < MAX_DISKS; i++) { |
snprintf(name, 16, "disk%d", i); |
rc = devmap_device_register(name, &dev_handle[i]); |
if (rc != EOK) { |
devmap_hangup_phone(DEVMAP_DRIVER); |
printf(NAME ": Unable to register device %s.\n", |
name); |
return rc; |
} |
} |
|
return EOK; |
} |
|
static void ata_bd_connection(ipc_callid_t iid, ipc_call_t *icall) |
{ |
void *fs_va = NULL; |
ipc_callid_t callid; |
ipc_call_t call; |
ipcarg_t method; |
dev_handle_t dh; |
int flags; |
int retval; |
off_t idx; |
off_t size; |
int disk_id, i; |
|
/* Get the device handle. */ |
dh = IPC_GET_ARG1(*icall); |
|
/* Determine which disk device is the client connecting to. */ |
disk_id = -1; |
for (i = 0; i < MAX_DISKS; i++) |
if (dev_handle[i] == dh) |
disk_id = i; |
|
if (disk_id < 0) { |
ipc_answer_0(iid, EINVAL); |
return; |
} |
|
/* Answer the IPC_M_CONNECT_ME_TO call. */ |
ipc_answer_0(iid, EOK); |
|
if (!ipc_share_out_receive(&callid, &comm_size, &flags)) { |
ipc_answer_0(callid, EHANGUP); |
return; |
} |
|
fs_va = as_get_mappable_page(comm_size); |
if (fs_va == NULL) { |
ipc_answer_0(callid, EHANGUP); |
return; |
} |
|
(void) ipc_share_out_finalize(callid, fs_va); |
|
while (1) { |
callid = async_get_call(&call); |
method = IPC_GET_METHOD(call); |
switch (method) { |
case IPC_M_PHONE_HUNGUP: |
/* The other side has hung up. */ |
ipc_answer_0(callid, EOK); |
return; |
case BD_READ_BLOCK: |
case BD_WRITE_BLOCK: |
idx = IPC_GET_ARG1(call); |
size = IPC_GET_ARG2(call); |
if (size > comm_size) { |
retval = EINVAL; |
break; |
} |
retval = ata_bd_rdwr(disk_id, method, idx, |
size, fs_va); |
break; |
default: |
retval = EINVAL; |
break; |
} |
ipc_answer_0(callid, retval); |
} |
} |
|
static int ata_bd_rdwr(int disk_id, ipcarg_t method, off_t blk_idx, off_t size, |
void *buf) |
{ |
int rc; |
off_t now; |
|
while (size > 0) { |
now = size < block_size ? size : (off_t) block_size; |
if (now != block_size) |
return EINVAL; |
|
if (method == BD_READ_BLOCK) |
rc = ata_bd_read_block(disk_id, blk_idx, 1, buf); |
else |
rc = ENOTSUP; |
|
if (rc != EOK) |
return rc; |
|
buf += block_size; |
blk_idx++; |
|
if (size > block_size) |
size -= block_size; |
else |
size = 0; |
} |
|
return EOK; |
} |
|
|
static int ata_bd_read_block(int disk_id, uint64_t blk_idx, size_t blk_cnt, |
void *buf) |
{ |
size_t i; |
uint16_t data; |
uint8_t status; |
uint64_t c, h, s; |
uint64_t idx; |
uint8_t drv_head; |
|
/* Check device bounds. */ |
if (blk_idx >= disk_blocks) |
return EINVAL; |
|
/* Compute CHS. */ |
c = blk_idx / (heads * sectors); |
idx = blk_idx % (heads * sectors); |
|
h = idx / sectors; |
s = 1 + (idx % sectors); |
|
/* New value for Drive/Head register */ |
drv_head = |
((disk_id != 0) ? DHR_DRV : 0) | |
(h & 0x0f); |
|
futex_down(&dev_futex); |
|
/* Program a Read Sectors operation. */ |
|
pio_write_8(&cmd->drive_head, drv_head); |
pio_write_8(&cmd->sector_count, 1); |
pio_write_8(&cmd->sector_number, s); |
pio_write_8(&cmd->cylinder_low, c & 0xff); |
pio_write_8(&cmd->cylinder_high, c >> 16); |
pio_write_8(&cmd->command, 0x20); |
|
/* Read data from the disk buffer. */ |
|
for (i = 0; i < 256; i++) { |
do { |
status = pio_read_8(&cmd->status); |
} while ((status & SR_DRDY) == 0); |
|
data = pio_read_16(&cmd->data_port); |
((uint16_t *) buf)[i] = data; |
} |
|
futex_up(&dev_futex); |
return EOK; |
} |
|
|
/** |
* @} |
*/ |