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/* flash.c
*
* Milkymist flash driver for RTEMS
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
* COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
*/
#define RTEMS_STATUS_CHECKS_USE_PRINTK
#include <rtems.h>
#include <stdio.h>
#include <bsp.h>
#include <string.h>
#include <rtems/libio.h>
#include <rtems/status-checks.h>
#include "../include/system_conf.h"
#include "milkymist_flash.h"
static struct flash_partition partitions[FLASH_PARTITION_COUNT]
= FLASH_PARTITIONS;
static rtems_id flash_lock;
rtems_device_driver flash_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc;
int i;
char devname[16];
for (i=0;i<FLASH_PARTITION_COUNT;i++) {
sprintf(devname, "/dev/flash%d", i+1);
sc = rtems_io_register_name(devname, major, i);
RTEMS_CHECK_SC(sc, "Create flash device");
}
sc = rtems_semaphore_create(
rtems_build_name('F', 'L', 'S', 'H'),
1,
RTEMS_SIMPLE_BINARY_SEMAPHORE,
0,
&flash_lock
);
RTEMS_CHECK_SC(sc, "create semaphore");
return RTEMS_SUCCESSFUL;
}
rtems_device_driver flash_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
void *startaddr;
int len;
if (minor >= FLASH_PARTITION_COUNT)
return RTEMS_UNSATISFIED;
startaddr = (void *)(partitions[minor].start_address
+ (unsigned int)rw_args->offset);
len = partitions[minor].length - rw_args->offset;
if (len > rw_args->count)
len = rw_args->count;
if (len <= 0) {
rw_args->bytes_moved = 0;
return RTEMS_SUCCESSFUL;
}
rtems_semaphore_obtain(flash_lock, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
memcpy(rw_args->buffer, startaddr, len);
rtems_semaphore_release(flash_lock);
rw_args->bytes_moved = len;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver flash_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
volatile unsigned short *startaddr;
unsigned short *srcdata;
int len;
int this_time;
int remaining;
int i;
if (minor >= FLASH_PARTITION_COUNT)
return RTEMS_UNSATISFIED;
startaddr = (unsigned short *)(partitions[minor].start_address
+ (unsigned int)rw_args->offset);
len = partitions[minor].length - rw_args->offset;
if (len > rw_args->count)
len = rw_args->count;
if (len <= 2) {
rw_args->bytes_moved = 0;
return RTEMS_SUCCESSFUL;
}
len /= 2;
srcdata = (unsigned short *)rw_args->buffer;
remaining = len;
rtems_semaphore_obtain(flash_lock, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
while (remaining > 0) {
this_time = remaining;
if (this_time > 256)
this_time = 256;
/* Issue "Buffered Programming Setup" command
* and wait for buffer available.
*/
do {
*startaddr = 0x00e8;
} while (!(*startaddr & 0x0080));
/* Load word count */
*startaddr = this_time-1;
/* Fill buffer */
for(i=0;i<this_time;i++)
startaddr[i] = srcdata[i];
/* Issue "Buffer Programming Confirm" command */
*startaddr = 0x00d0;
while (!(*startaddr & 0x0080)); /* read status register, wait for ready */
*startaddr = 0x0050; /* clear status register */
/* update state */
startaddr += this_time;
srcdata += this_time;
remaining -= this_time;
}
*startaddr = 0x00ff; /* back to read array mode */
rtems_semaphore_release(flash_lock);
rw_args->bytes_moved = 2*len;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver flash_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_ioctl_args_t *args = arg;
unsigned int eraseaddr_i;
volatile unsigned short *eraseaddr;
if (minor >= FLASH_PARTITION_COUNT) {
args->ioctl_return = -1;
return RTEMS_UNSATISFIED;
}
switch (args->command) {
case FLASH_GET_SIZE:
*((unsigned int *)args->buffer) = partitions[minor].length;
break;
case FLASH_GET_BLOCKSIZE:
*((unsigned int *)args->buffer) = 128*1024;
break;
case FLASH_ERASE_BLOCK:
eraseaddr_i = (unsigned int)args->buffer;
if (eraseaddr_i >= partitions[minor].length) {
args->ioctl_return = -1;
return RTEMS_UNSATISFIED;
}
eraseaddr_i = eraseaddr_i + partitions[minor].start_address;
eraseaddr = (unsigned short *)eraseaddr_i;
rtems_semaphore_obtain(flash_lock, RTEMS_WAIT, RTEMS_NO_TIMEOUT);
*eraseaddr = 0x0020; /* erase */
*eraseaddr = 0x00d0;
while(!(*eraseaddr & 0x0080)); /* read status register, wait for ready */
*eraseaddr = 0x0050; /* clear status register */
*eraseaddr = 0x00ff; /* back to read array mode */
rtems_semaphore_release(flash_lock);
break;
default:
args->ioctl_return = -1;
return RTEMS_UNSATISFIED;
}
args->ioctl_return = 0;
return RTEMS_SUCCESSFUL;
}
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