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authorJuha Riihimäki <juha.riihimaki@nokia.com>2011-07-29 16:35:21 +0100
committerAndrzej Zaborowski <andrew.zaborowski@intel.com>2011-07-30 06:09:32 +0200
commit48197dfa6a26fa1807f19f510a2e840bb3885680 (patch)
treec93fc82ffbef046f518212963722f3d8ffdd8756 /hw
parentac2466cdc625d0cf9e7a885b7901084ac59d507f (diff)
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hw/nand: Support devices wider than 8 bits
Support NAND devices which are wider than 8 bits. Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com> [Riku Voipio: Fixes and restructuring patchset] Signed-off-by: Riku Voipio <riku.voipio@iki.fi> [Peter Maydell: More fixes and cleanups for upstream submission] Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/flash.h5
-rw-r--r--hw/nand.c117
2 files changed, 88 insertions, 34 deletions
diff --git a/hw/flash.h b/hw/flash.h
index a992bb8..132ad29 100644
--- a/hw/flash.h
+++ b/hw/flash.h
@@ -24,8 +24,9 @@ void nand_done(NANDFlashState *s);
void nand_setpins(NANDFlashState *s, uint8_t cle, uint8_t ale,
uint8_t ce, uint8_t wp, uint8_t gnd);
void nand_getpins(NANDFlashState *s, int *rb);
-void nand_setio(NANDFlashState *s, uint8_t value);
-uint8_t nand_getio(NANDFlashState *s);
+void nand_setio(NANDFlashState *s, uint32_t value);
+uint32_t nand_getio(NANDFlashState *s);
+uint32_t nand_getbuswidth(NANDFlashState *s);
#define NAND_MFR_TOSHIBA 0x98
#define NAND_MFR_SAMSUNG 0xec
diff --git a/hw/nand.c b/hw/nand.c
index f5f204a..4d1dff1 100644
--- a/hw/nand.c
+++ b/hw/nand.c
@@ -49,6 +49,7 @@
struct NANDFlashState {
uint8_t manf_id, chip_id;
+ uint8_t buswidth; /* in BYTES */
int size, pages;
int page_shift, oob_shift, erase_shift, addr_shift;
uint8_t *storage;
@@ -215,6 +216,14 @@ static void nand_reset(NANDFlashState *s)
s->status &= NAND_IOSTATUS_UNPROTCT;
}
+static inline void nand_pushio_byte(NANDFlashState *s, uint8_t value)
+{
+ s->ioaddr[s->iolen++] = value;
+ for (value = s->buswidth; --value;) {
+ s->ioaddr[s->iolen++] = 0;
+ }
+}
+
static void nand_command(NANDFlashState *s)
{
unsigned int offset;
@@ -224,15 +233,19 @@ static void nand_command(NANDFlashState *s)
break;
case NAND_CMD_READID:
- s->io[0] = s->manf_id;
- s->io[1] = s->chip_id;
- s->io[2] = 'Q'; /* Don't-care byte (often 0xa5) */
- if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP)
- s->io[3] = 0x15; /* Page Size, Block Size, Spare Size.. */
- else
- s->io[3] = 0xc0; /* Multi-plane */
s->ioaddr = s->io;
- s->iolen = 4;
+ s->iolen = 0;
+ nand_pushio_byte(s, s->manf_id);
+ nand_pushio_byte(s, s->chip_id);
+ nand_pushio_byte(s, 'Q'); /* Don't-care byte (often 0xa5) */
+ if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) {
+ /* Page Size, Block Size, Spare Size; bit 6 indicates
+ * 8 vs 16 bit width NAND.
+ */
+ nand_pushio_byte(s, (s->buswidth == 2) ? 0x55 : 0x15);
+ } else {
+ nand_pushio_byte(s, 0xc0); /* Multi-plane */
+ }
break;
case NAND_CMD_RANDOMREAD2:
@@ -277,9 +290,9 @@ static void nand_command(NANDFlashState *s)
break;
case NAND_CMD_READSTATUS:
- s->io[0] = s->status;
s->ioaddr = s->io;
- s->iolen = 1;
+ s->iolen = 0;
+ nand_pushio_byte(s, s->status);
break;
default:
@@ -357,8 +370,10 @@ void nand_getpins(NANDFlashState *s, int *rb)
*rb = 1;
}
-void nand_setio(NANDFlashState *s, uint8_t value)
+void nand_setio(NANDFlashState *s, uint32_t value)
{
+ int i;
+
if (!s->ce && s->cle) {
if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) {
if (s->cmd == NAND_CMD_READ0 && value == NAND_CMD_LPREAD2)
@@ -404,36 +419,64 @@ void nand_setio(NANDFlashState *s, uint8_t value)
s->addr = (s->addr & mask) | v;
s->addrlen ++;
- if (s->addrlen == 1 && s->cmd == NAND_CMD_READID)
- nand_command(s);
-
- if (!(nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
- s->addrlen == 3 && (
- s->cmd == NAND_CMD_READ0 ||
- s->cmd == NAND_CMD_PAGEPROGRAM1))
- nand_command(s);
- if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
- s->addrlen == 4 && (
- s->cmd == NAND_CMD_READ0 ||
- s->cmd == NAND_CMD_PAGEPROGRAM1))
- nand_command(s);
+ switch (s->addrlen) {
+ case 1:
+ if (s->cmd == NAND_CMD_READID) {
+ nand_command(s);
+ }
+ break;
+ case 2: /* fix cache address as a byte address */
+ s->addr <<= (s->buswidth - 1);
+ break;
+ case 3:
+ if (!(nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
+ (s->cmd == NAND_CMD_READ0 ||
+ s->cmd == NAND_CMD_PAGEPROGRAM1)) {
+ nand_command(s);
+ }
+ break;
+ case 4:
+ if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
+ nand_flash_ids[s->chip_id].size < 256 && /* 1Gb or less */
+ (s->cmd == NAND_CMD_READ0 ||
+ s->cmd == NAND_CMD_PAGEPROGRAM1)) {
+ nand_command(s);
+ }
+ break;
+ case 5:
+ if ((nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) &&
+ nand_flash_ids[s->chip_id].size >= 256 && /* 2Gb or more */
+ (s->cmd == NAND_CMD_READ0 ||
+ s->cmd == NAND_CMD_PAGEPROGRAM1)) {
+ nand_command(s);
+ }
+ break;
+ default:
+ break;
+ }
}
if (!s->cle && !s->ale && s->cmd == NAND_CMD_PAGEPROGRAM1) {
- if (s->iolen < (1 << s->page_shift) + (1 << s->oob_shift))
- s->io[s->iolen ++] = value;
+ if (s->iolen < (1 << s->page_shift) + (1 << s->oob_shift)) {
+ for (i = s->buswidth; i--; value >>= 8) {
+ s->io[s->iolen ++] = (uint8_t) (value & 0xff);
+ }
+ }
} else if (!s->cle && !s->ale && s->cmd == NAND_CMD_COPYBACKPRG1) {
if ((s->addr & ((1 << s->addr_shift) - 1)) <
(1 << s->page_shift) + (1 << s->oob_shift)) {
- s->io[s->iolen + (s->addr & ((1 << s->addr_shift) - 1))] = value;
- s->addr ++;
+ for (i = s->buswidth; i--; s->addr++, value >>= 8) {
+ s->io[s->iolen + (s->addr & ((1 << s->addr_shift) - 1))] =
+ (uint8_t) (value & 0xff);
+ }
}
}
}
-uint8_t nand_getio(NANDFlashState *s)
+uint32_t nand_getio(NANDFlashState *s)
{
int offset;
+ uint32_t x = 0;
/* Allow sequential reading */
if (!s->iolen && s->cmd == NAND_CMD_READ0) {
@@ -450,9 +493,18 @@ uint8_t nand_getio(NANDFlashState *s)
if (s->ce || s->iolen <= 0)
return 0;
- s->iolen --;
- s->addr++;
- return *(s->ioaddr ++);
+ for (offset = s->buswidth; offset--;) {
+ x |= s->ioaddr[offset] << (offset << 3);
+ }
+ s->addr += s->buswidth;
+ s->ioaddr += s->buswidth;
+ s->iolen -= s->buswidth;
+ return x;
+}
+
+uint32_t nand_getbuswidth(NANDFlashState *s)
+{
+ return s->buswidth << 3;
}
NANDFlashState *nand_init(BlockDriverState *bdrv, int manf_id, int chip_id)
@@ -468,6 +520,7 @@ NANDFlashState *nand_init(BlockDriverState *bdrv, int manf_id, int chip_id)
s->bdrv = bdrv;
s->manf_id = manf_id;
s->chip_id = chip_id;
+ s->buswidth = nand_flash_ids[s->chip_id].width >> 3;
s->size = nand_flash_ids[s->chip_id].size << 20;
if (nand_flash_ids[s->chip_id].options & NAND_SAMSUNG_LP) {
s->page_shift = 11;