/*
* s3c2400 smc disk block device implementation
*
* Squidge's SMC Low-level access routines.
* Inspired and derived from routines provided by Samsung Electronics
* M/M R&D Center & FireFly.
*/
#include <rtems.h>
#include <rtems/libio.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include "rtems/blkdev.h"
#include "rtems/diskdevs.h"
#include "smc.h"
#include <rtems/bspIo.h>
#include <s3c24xx.h>
#define SMC_DEVICE_NAME "/dev/smc"
#define SMC_SAMSUNG_ID 0xEC
#define SMC_TOSHIBA_ID 0x98
#define SMC_16MB 0x73
#define SMC_32MB 0x75
#define SMC_64MB 0x76
#define SMC_128MB 0x79
#define LBA_UNUSED 0x80000000
#define LBA_RESERVED 0x80000001
#define BLOCK_UNUSED 0x80000000
#define BLOCK_RESERVED 0x80000001
/* SmartMedia Command */
#define SEQ_DATA_INPUT_CMD 0x80
#define READ1_CMD 0x00
#define READ1_1_CMD 0x01
#define READ2_CMD 0x50
#define READ_ID_CMD 0x90
#define RESET_CMD 0xFF
#define PAGE_PROGRAM_CMD 0x10
#define BLOCK_ERASE_CMD 0x60
#define BLOCK_ERASE_CFM_CMD 0xD0
#define READ_STATUS_CMD 0x70
#define RESET_PTR_CMD 0x00
/* Internal SMC disk descriptor */
struct SMC_INFO {
uint8_t id[3];
uint32_t bytes_per_page;
uint32_t pages_per_block;
uint32_t blocks;
uint32_t mb;
};
/* Ths S3c2410 uses a different register map */
#ifdef CPU_S3C2410
#define rPBDAT rGPBDAT
#define rPBCON rGPBCON
#define rPDDAT rGPDDAT
#define rPEDAT rGPEDAT
#endif
static struct SMC_INFO smc_info;
uint32_t smc_l2p[0x2000];
uint32_t smc_p2l[0x2000];
#define sm_busy() while (!(rPDDAT & 0x200))
#define sm_chip_en() rPDDAT &= (~0x80)
#define sm_chip_dis() rPDDAT |= 0x80
#define sm_cle_en() rPEDAT |= 0x20
#define sm_cle_dis() rPEDAT &= (~0x20)
#define sm_ale_en() rPEDAT |= 0x10
#define sm_ale_dis() rPEDAT &= (~0x10)
#define sm_wp_en() rPDDAT &= (~0x40)
#define sm_wp_dis() rPDDAT |= 0x40
#define sm_read_en() rPBCON &= 0xFFFF0000
#define sm_read_dis() rPBCON = (rPBCON & 0xFFFF0000) | 0x5555
#define sm_write_en() sm_read_dis()
#define sm_write_dis() sm_read_en()
static void sm_write( uint8_t data)
{
rPBDAT = (rPBDAT & 0xFF00) | data;
rPEDAT &= (~0x08);
rPEDAT |= 0x08;
}
static uint8_t sm_read(void)
{
uint8_t data;
rPDDAT &= (~0x100);
data = rPBDAT & 0xFF;
rPDDAT |= 0x100;
return data;
}
/* assumes chip enabled
bit 7: write protected = 0, write enabled = 1
bit 6: busy = 0, ready = 1
bit 0: success = 0, failed = 1
returns 1 on success, 0 on fail
*/
#if UNUSED
static static uint8_t sm_status()
{
uint8_t status;
sm_cle_en();
sm_write_en();
sm_write(READ_STATUS_CMD);
sm_write_dis();
sm_cle_dis();
sm_read_en();
status = sm_read();
sm_read_dis();
if (status == 0xC0)
return 1;
else
return 0;
}
#endif
static void smc_read_id( uint8_t* buf, uint32_t length)
{
uint32_t i;
sm_chip_en();
sm_cle_en();
sm_write_en();
sm_write(READ_ID_CMD);
sm_write_dis();
sm_cle_dis();
sm_ale_en();
sm_write_en();
sm_write( 0);
sm_write_dis();
sm_ale_dis();
sm_read_en();
for (i=0;i<length;i++) *(buf+i) = sm_read();
sm_read_dis();
sm_chip_dis();
}
/* read an entire logical page of 512 bytes.*/
static uint8_t smc_read_page (uint32_t lpage, uint8_t* buf)
{
uint32_t block, page, i;
/* convert logical block to physical block
and then convert into page suitable for read1 command...
*/
block = lpage >> 5;
if (smc_l2p[block] < LBA_UNUSED) {
page = smc_l2p[block] << 5;
page += (lpage & 0x1F);
}
else
return 0;
sm_chip_en();
sm_cle_en();
sm_write_en();
sm_write(READ1_CMD);
sm_write_dis();
sm_cle_dis();
sm_ale_en();
sm_write_en();
sm_write( 0x00);
sm_write( (uint8_t)(page >> 0));
sm_write( (uint8_t)(page >> 8));
if (smc_info.mb >= 64)
sm_write( (uint8_t)(page >> 16));
sm_write_dis();
sm_ale_dis();
sm_busy();
sm_read_en();
for (i = 0; i < 512; i++) {
*buf = sm_read();
buf++;
}
sm_read_dis();
sm_chip_dis();
sm_busy();
return 1;
}
static void smc_read_spare( uint32_t page, uint8_t* buf, uint8_t length)
{
uint32_t i;
sm_chip_en();
sm_cle_en();
sm_read_dis();
sm_write(READ2_CMD);
sm_read_en();
sm_cle_dis();
sm_ale_en();
sm_read_dis();
sm_write( 0x00);
sm_write( (uint8_t)(page >> 0));
sm_write( (uint8_t)(page >> 8));
if (smc_info.mb >= 64)
sm_write( (uint8_t)(page >> 16));
sm_read_en();
sm_ale_dis();
sm_busy();
sm_read_en();
for (i=0;i<length;i++)
*(buf+i) = sm_read();
sm_read_dis();
sm_chip_dis();
}
static void smc_make_l2p(void)
{
uint32_t pblock, i, j, lblock, zone, count, cnt1, cnt2, cnt3;
uint8_t data[512];
cnt1 = 0;
cnt2 = 0;
cnt3 = 0;
for (i=0;i<0x2000;i++) {
smc_l2p[i] = LBA_RESERVED;
smc_p2l[i] = BLOCK_RESERVED;
}
for (pblock=0;pblock<smc_info.blocks;pblock++) {
/* read physical block - first page */
smc_read_spare( pblock*smc_info.pages_per_block, (uint8_t*)&data, 16);
zone = pblock >> 10; /* divide by 1024 to get zone */
if ((data[5] == 0xFF) && ((data[6]&0xF8) == 0x10)) {
lblock = ((((data[6]<<8)|(data[7]<<0)) >> 1) & 0x03FF) + (zone * 1000);
smc_l2p[lblock] = pblock;
smc_p2l[pblock] = lblock;
cnt1++;
} else {
count = 0;
for (j=0;j<16;j++) {
if (data[j] == 0xFF) count++;
}
if (count == 16) {
smc_p2l[pblock] = BLOCK_UNUSED;
cnt2++;
} else {
smc_p2l[pblock] = BLOCK_RESERVED;
cnt3++;
}
}
}
}
static void smc_detect( uint8_t id1, uint8_t id2, uint8_t id3)
{
smc_info.id[0] = id1;
smc_info.id[1] = id2;
smc_info.id[2] = id3;
smc_info.mb = 0;
smc_info.bytes_per_page = 0;
smc_info.pages_per_block = 0;
smc_info.blocks = 0;
switch (id1) {
case SMC_SAMSUNG_ID:
case SMC_TOSHIBA_ID: {
switch (id2) {
case SMC_16MB : smc_info.mb = 16; break;
case SMC_32MB : smc_info.mb = 32; break;
case SMC_64MB : smc_info.mb = 64; break;
case SMC_128MB : smc_info.mb = 128; break;
}
break;
}
}
switch (smc_info.mb) {
case 16 : smc_info.bytes_per_page = 512; smc_info.pages_per_block = 32; smc_info.blocks = 0x0400; break;
case 32 : smc_info.bytes_per_page = 512; smc_info.pages_per_block = 32; smc_info.blocks = 0x0800; break;
case 64 : smc_info.bytes_per_page = 512; smc_info.pages_per_block = 32; smc_info.blocks = 0x1000; break;
case 128 : smc_info.bytes_per_page = 512; smc_info.pages_per_block = 32; smc_info.blocks = 0x2000; break;
}
}
static void smc_init( void)
{
unsigned char buf[32];
int i;
/* reset smc */
sm_chip_en();
sm_cle_en();
sm_write_en();
sm_write(0xFF);
sm_write_dis();
sm_cle_dis();
for(i=0;i<10;i++);
sm_busy();
sm_chip_dis();
smc_read_id (buf, 4);
smc_detect (buf[0], buf[1], buf[2]);
printk ("SMC: [%02X-%02X-%02X-%02X]\n", buf[0], buf[1], buf[2], buf[3]);
printk ("SMC size: %dMB detected\n",smc_info.mb);
smc_make_l2p();
}
/**********
* Function: sm_ECCEncode (completely ripped, unaltered, from the samsung routines)
* Remark:
* - adopted from "ECC Algorithm for SmartMedia V3.0"
* by Memory Product & Technology, Samsung Electronics Co. (ecc30.pdf)
**********/
int sm_ECCEncode(const uint8_t * p_buf, uint8_t * p_ecc)
{
uint32_t i, j;
uint8_t paritr[256], tmp = 0, tmp2 = 0;
uint8_t data_table0[16] = { 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 };
uint8_t data_table1[16] = { 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1 };
uint8_t sum = 0, paritc = 0;
uint8_t parit0c = 0, parit1c = 0, parit2c = 0, parit3c = 0;
uint8_t parit4c = 0, parit5c = 0, parit6c = 0, parit7c = 0;
uint8_t parit1_1, parit1_2, parit2_1, parit2_2, parit4_1, parit4_2;
uint8_t parit8_1 = 0, parit8_2 = 0, parit16_1 = 0, parit16_2 = 0, parit32_1 = 0, parit32_2 = 0;
uint8_t parit64_1 = 0, parit64_2 = 0, parit128_1 = 0, parit128_2 = 0, parit256_1 = 0, parit256_2 = 0;
uint8_t parit512_1 = 0, parit512_2 = 0, parit1024_1 = 0, parit1024_2 = 0;
uint8_t* paritr_ptr;
paritr_ptr = paritr;
for (i = 0; i < 256; ++i, ++paritr_ptr, ++p_buf) {
paritc ^= *p_buf;
tmp = (*p_buf & 0xf0) >> 4;
tmp2 = *p_buf & 0x0f;
switch (tmp) {
case 0:
case 3:
case 5:
case 6:
case 9:
case 10:
case 12:
case 15:
*paritr_ptr = *(data_table0 + tmp2);
break;
case 1:
case 2:
case 4:
case 7:
case 8:
case 11:
case 13:
case 14:
*paritr_ptr = *(data_table1 + tmp2);
break;
}
}
parit0c = (paritc & 0x01) ? 1 : 0;
parit1c = (paritc & 0x02) ? 1 : 0;
parit2c = (paritc & 0x04) ? 1 : 0;
parit3c = (paritc & 0x08) ? 1 : 0;
parit4c = (paritc & 0x10) ? 1 : 0;
parit5c = (paritc & 0x20) ? 1 : 0;
parit6c = (paritc & 0x40) ? 1 : 0;
parit7c = (paritc & 0x80) ? 1 : 0;
parit1_2 = parit6c ^ parit4c ^ parit2c ^ parit0c;
parit1_1 = parit7c ^ parit5c ^ parit3c ^ parit1c;
parit2_2 = parit5c ^ parit4c ^ parit1c ^ parit0c;
parit2_1 = parit7c ^ parit6c ^ parit3c ^ parit2c;
parit4_2 = parit3c ^ parit2c ^ parit1c ^ parit0c;
parit4_1 = parit7c ^ parit6c ^ parit5c ^ parit4c;
paritr_ptr = paritr;
for (i = 0; i < 256; ++i, ++paritr_ptr) {
sum ^= *paritr_ptr;
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 2, paritr_ptr += 2) {
parit8_2 ^= *paritr_ptr;
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 4, paritr_ptr += 4) {
parit16_2 ^= *paritr_ptr;
parit16_2 ^= *(paritr_ptr + 1);
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 8, paritr_ptr += 8) {
for (j = 0; j <= 3; ++j) {
parit32_2 ^= *(paritr_ptr + j);
}
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 16, paritr_ptr += 16) {
for (j = 0; j <= 7; ++j) {
parit64_2 ^= *(paritr_ptr + j);
}
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 32, paritr_ptr += 32) {
for (j = 0; j <= 15; ++j) {
parit128_2 ^= *(paritr_ptr + j);
}
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 64, paritr_ptr += 64) {
for (j = 0; j <= 31; ++j) {
parit256_2 ^= *(paritr_ptr + j);
}
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 128, paritr_ptr += 128) {
for (j = 0; j <= 63; ++j) {
parit512_2 ^= *(paritr_ptr + j);
}
}
paritr_ptr = paritr;
for (i = 0; i < 256; i += 256, paritr_ptr += 256) {
for (j = 0; j <= 127; ++j) {
parit1024_2 ^= *(paritr_ptr + j);
}
}
if (sum==0) {
parit1024_1 = parit1024_2;
parit512_1 = parit512_2;
parit256_1 = parit256_2;
parit128_1 = parit128_2;
parit64_1 = parit64_2;
parit32_1 = parit32_2;
parit16_1 = parit16_2;
parit8_1 = parit8_2;
} else {
parit1024_1 = parit1024_2 ? 0 : 1;
parit512_1 = parit512_2 ? 0 : 1;
parit256_1 = parit256_2 ? 0 : 1;
parit128_1 = parit128_2 ? 0 : 1;
parit64_1 = parit64_2 ? 0 : 1;
parit32_1 = parit32_2 ? 0 : 1;
parit16_1 = parit16_2 ? 0 : 1;
parit8_1 = parit8_2 ? 0 : 1;
}
parit1_2 <<= 2;
parit1_1 <<= 3;
parit2_2 <<= 4;
parit2_1 <<= 5;
parit4_2 <<= 6;
parit4_1 <<= 7;
parit128_1 <<= 1;
parit256_2 <<= 2;
parit256_1 <<= 3;
parit512_2 <<= 4;
parit512_1 <<= 5;
parit1024_2 <<= 6;
parit1024_1 <<= 7;
parit8_1 <<= 1;
parit16_2 <<= 2;
parit16_1 <<= 3;
parit32_2 <<= 4;
parit32_1 <<= 5;
parit64_2 <<= 6;
parit64_1 <<= 7;
p_ecc[0] = ~(parit64_1 | parit64_2 | parit32_1 | parit32_2 | parit16_1 | parit16_2 | parit8_1 | parit8_2);
p_ecc[1] = ~(parit1024_1 |parit1024_2 | parit512_1 | parit512_2 | parit256_1 | parit256_2 | parit128_1 | parit128_2);
p_ecc[2] = ~(parit4_1 | parit4_2 | parit2_1 | parit2_2 | parit1_1 | parit1_2);
return 0;
}
/* smc_write --
* write stub
*/
static int smc_write(rtems_blkdev_request *req)
{
rtems_blkdev_request_done(req, RTEMS_SUCCESSFUL);
return 0;
}
/* smc_read --
* PARAMETERS:
* req - pointer to the READ block device request info
*
* RETURNS:
* ioctl return value
*/
static int
smc_read(rtems_blkdev_request *req)
{
uint32_t i;
rtems_blkdev_sg_buffer *sg;
uint32_t remains;
remains = smc_info.bytes_per_page * req->bufnum;
sg = req->bufs;
for (i = 0; (remains > 0) && (i < req->bufnum); i++, sg++)
{
int count = sg->length;
if (count > remains)
count = remains;
smc_read_page(sg->block,sg->buffer);
remains -= count;
}
rtems_blkdev_request_done(req, RTEMS_SUCCESSFUL);
return 0;
}
/* smc_ioctl --
* IOCTL handler for SMC device.
*
* PARAMETERS:
* dev - device number (major, minor number)
* req - IOCTL request code
* argp - IOCTL argument
*
* RETURNS:
* IOCTL return value
*/
static int
smc_ioctl(rtems_disk_device *dd, uint32_t req, void *argp)
{
switch (req)
{
case RTEMS_BLKIO_REQUEST:
{
rtems_blkdev_request *r = argp;
switch (r->req)
{
case RTEMS_BLKDEV_REQ_READ:
return smc_read(r);
case RTEMS_BLKDEV_REQ_WRITE:
return smc_write(r);
default:
errno = EINVAL;
return -1;
}
break;
}
default:
errno = EINVAL;
return -1;
}
}
/* smc_initialize --
* RAM disk device driver initialization. Run through RAM disk
* configuration information and configure appropriate RAM disks.
*
* PARAMETERS:
* major - RAM disk major device number
* minor - minor device number, not applicable
* arg - initialization argument, not applicable
*
* RETURNS:
* none
*/
rtems_device_driver
smc_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg)
{
rtems_status_code rc;
dev_t dev;
uint32_t block_num;
rc = rtems_disk_io_initialize();
if (rc != RTEMS_SUCCESSFUL)
return rc;
smc_init();
block_num = smc_info.blocks << 5;
dev = rtems_filesystem_make_dev_t(major, 0);
rc = rtems_disk_create_phys(dev, 512, block_num,
smc_ioctl, NULL, SMC_DEVICE_NAME);
return RTEMS_SUCCESSFUL;
}
