/*
* 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>
#include <bool.h>
#include "ata_bd.h"
#define NAME "ata_bd"
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 disk_t disk[MAX_DISKS];
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);
static int drive_identify(int drive_id, disk_t *d);
int main(int argc, char **argv)
{
uint8_t status;
char name[16];
int i, rc;
int n_disks;
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. */
pio_write_8(&ctl->device_control, DCR_SRST);
/* FIXME: Find out how to do this properly. */
async_usleep(100);
pio_write_8(&ctl->device_control, 0);
do {
status = pio_read_8(&cmd->status);
} while ((status & SR_BSY) != 0);
printf("Status = 0x%x\n", pio_read_8
(&cmd
->status
));
(void) drive_identify(0, &disk[0]);
(void) drive_identify(1, &disk[1]);
n_disks = 0;
for (i = 0; i < MAX_DISKS; i++) {
/* Skip unattached drives. */
if (disk[i].present == false)
continue;
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;
}
++n_disks;
}
if (n_disks == 0) {
printf("No disks detected.\n"); return -1;
}
printf(NAME
": Accepting connections\n"); async_manager();
/* Not reached */
return 0;
}
static int drive_identify(int disk_id, disk_t *d)
{
uint16_t data;
uint8_t status;
int i;
printf("Identify drive %d\n", disk_id
); pio_write_8(&cmd->drive_head, ((disk_id != 0) ? DHR_DRV : 0));
async_usleep(100);
pio_write_8(&cmd->command, CMD_IDENTIFY_DRIVE);
status = pio_read_8(&cmd->status);
printf("Status = 0x%x\n", status
);
d->present = false;
/*
* Detect if drive is present. This is Qemu only! Need to
* do the right thing to work with real drives.
*/
if ((status & SR_DRDY) == 0) {
return ENOENT;
}
for (i = 0; i < block_size / 2; i++) {
do {
status = pio_read_8(&cmd->status);
} while ((status & SR_DRDY) == 0);
data = pio_read_16(&cmd->data_port);
switch (i) {
case 1: d->cylinders = data; break;
case 3: d->heads = data; break;
case 6: d->sectors = data; break;
}
}
printf("\n\nStatus = 0x%x\n", pio_read_8
(&cmd
->status
));
d->blocks = d->cylinders * d->heads * d->sectors;
printf("Geometry: %u cylinders, %u heads, %u sectors\n", d->cylinders, d->heads, d->sectors);
d->present = true;
return EOK;
}
static int ata_bd_init(void)
{
void *vaddr;
int rc;
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;
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 || disk[disk_id].present == false) {
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;
disk_t *d;
d = &disk[disk_id];
/* Check device bounds. */
if (blk_idx >= d->blocks)
return EINVAL;
/* Compute CHS. */
c = blk_idx / (d->heads * d->sectors);
idx = blk_idx % (d->heads * d->sectors);
h = idx / d->sectors;
s = 1 + (idx % d->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, CMD_READ_SECTORS);
/* Read data from the disk buffer. */
for (i = 0; i < block_size / 2; 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;
}
/**
* @}
*/