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-rw-r--r--board/delta/nand.c229
1 files changed, 146 insertions, 83 deletions
diff --git a/board/delta/nand.c b/board/delta/nand.c
index bd1bb4f..7255827 100644
--- a/board/delta/nand.c
+++ b/board/delta/nand.c
@@ -29,39 +29,13 @@
#include <asm/arch/pxa-regs.h>
/*
- * hardware specific access to control-lines
- * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
+ * not required for Monahans DFC
*/
static void delta_hwcontrol(struct mtd_info *mtdinfo, int cmd)
{
-#if 0
- struct nand_chip *this = mtdinfo->priv;
- ulong base = (ulong) this->IO_ADDR_W;
-
- switch(cmd) {
- case NAND_CTL_SETCLE:
- MACRO_NAND_CTL_SETCLE((unsigned long)base);
- break;
- case NAND_CTL_CLRCLE:
- MACRO_NAND_CTL_CLRCLE((unsigned long)base);
- break;
- case NAND_CTL_SETALE:
- MACRO_NAND_CTL_SETALE((unsigned long)base);
- break;
- case NAND_CTL_CLRALE:
- MACRO_NAND_CTL_CLRALE((unsigned long)base);
- break;
- case NAND_CTL_SETNCE:
- MACRO_NAND_ENABLE_CE((unsigned long)base);
- break;
- case NAND_CTL_CLRNCE:
- MACRO_NAND_DISABLE_CE((unsigned long)base);
- break;
- }
-#endif
+ return;
}
-
/* read device ready pin */
static int delta_device_ready(struct mtd_info *mtdinfo)
{
@@ -69,35 +43,18 @@ static int delta_device_ready(struct mtd_info *mtdinfo)
return 1;
else
return 0;
-#if 0
- struct nand_chip *this = mtdinfo->priv;
- ulong rb_gpio_pin;
-
- /* use the base addr to find out which chip are we dealing with */
- switch((ulong) this->IO_ADDR_W) {
- case CFG_NAND0_BASE:
- rb_gpio_pin = CFG_NAND0_RDY;
- break;
- case CFG_NAND1_BASE:
- rb_gpio_pin = CFG_NAND1_RDY;
- break;
- default: /* this should never happen */
- return 0;
- break;
- }
-
- if (in32(GPIO0_IR) & rb_gpio_pin)
- return 1;
-#endif
return 0;
}
-static u_char delta_read_byte(struct mtd_info *mtd)
+/* The original:
+ * static void delta_read_buf(struct mtd_info *mtd, const u_char *buf, int len)
+ *
+ * Shouldn't this be "u_char * const buf" ?
+ */
+static void delta_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
{
-/* struct nand_chip *this = mtd->priv; */
- unsigned long tmp;
+ int i, j;
- /* wait for read request */
while(1) {
if(NDSR & NDSR_RDDREQ) {
NDSR |= NDSR_RDDREQ;
@@ -105,9 +62,53 @@ static u_char delta_read_byte(struct mtd_info *mtd)
}
}
- tmp = NDDB;
- printk("delta_read_byte: 0x%x.\n", tmp);
- return (u_char) tmp;
+ /* we have to be carefull not to overflow the buffer if len is
+ * not a multiple of 4 */
+ unsigned long num_words = len & 0xfffffffc;
+ unsigned long rest = len & 0x3;
+
+ /* if there are any, first copy multiple of 4 bytes */
+ if(num_words) {
+ for(i=0; i<num_words; i+=4)
+ buf[i] = NDDB;
+ }
+
+ /* ...then the rest */
+ if(rest) {
+ unsigned long rest_data = NDDB;
+ for(j=0;j<rest;j++)
+ buf[i+j] = (u_char) ((rest_data>>j) & 0xff);
+ }
+
+ return;
+}
+
+/* global var, too bad */
+static unsigned long read_buf = 0;
+static unsigned char bytes_read = 0;
+
+static u_char delta_read_byte(struct mtd_info *mtd)
+{
+/* struct nand_chip *this = mtd->priv; */
+ unsigned char byte;
+
+ if(bytes_read == 0) {
+ /* wait for read request */
+ while(1) {
+ if(NDSR & NDSR_RDDREQ) {
+ NDSR |= NDSR_RDDREQ;
+ break;
+ }
+ }
+ read_buf = NDDB;
+ printk("delta_read_byte: 0x%x.\n", read_buf);
+ }
+ byte = (unsigned char) (read_buf>>(8 * bytes_read++));
+ if(bytes_read >= 4)
+ bytes_read = 0;
+
+ printf("delta_read_byte: returning 0x%x.\n", byte);
+ return byte;
}
/* this is really monahans, not board specific ... */
@@ -116,8 +117,11 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
{
/* register struct nand_chip *this = mtd->priv; */
unsigned long ndcb0=0, ndcb1=0, ndcb2=0;
- uchar command2;
+ /* clear the ugly byte read buffer */
+ bytes_read = 0;
+ read_buf = 0;
+
/* Clear NDSR */
NDSR = 0xFFF;
@@ -134,34 +138,58 @@ static void delta_cmdfunc(struct mtd_info *mtd, unsigned command,
}
}
- /* if command is a double byte cmd, we set bit double cmd bit 19 */
- command2 = (command>>8) & 0xFF;
- ndcb0 = command | ((command2 ? 1 : 0) << 19);
+ /* if command is a double byte cmd, we set bit double cmd bit 19 */
+ /* command2 = (command>>8) & 0xFF; */
+ /* ndcb0 = command | ((command2 ? 1 : 0) << 19); *\/ */
switch (command) {
+ case NAND_CMD_READ0:
+ ndcb0 = (NAND_CMD_READ0 | (4<<16));
+ column >>= 1; /* adjust for 16 bit bus */
+ ndcb1 = (((column>>1) & 0xff) |
+ ((page_addr<<8) & 0xff00) |
+ ((page_addr<<8) & 0xff0000) |
+ ((page_addr<<8) & 0xff000000)); /* make this 0x01000000 ? */
+ break;
case NAND_CMD_READID:
printk("delta_cmdfunc: NAND_CMD_READID.\n");
- ndcb0 |= ((3 << 21) | (1 << 16)); /* addr cycles*/
+ ndcb0 = (NAND_CMD_READID | (3 << 21) | (1 << 16)); /* addr cycles*/
break;
case NAND_CMD_PAGEPROG:
+ break;
case NAND_CMD_ERASE1:
case NAND_CMD_ERASE2:
+ break;
case NAND_CMD_SEQIN:
+ ndcb0 = (NAND_CMD_SEQIN<<8) | (1<<19) | (4<<16);
+ if(column >= mtd->oobblock) {
+ /* OOB area */
+ column -= mtd->oobblock;
+ ndcb0 |= NAND_CMD_READOOB;
+ } else if (column < 256) {
+ /* First 256 bytes --> READ0 */
+ ndcb0 |= NAND_CMD_READ0;
+ } else {
+ /* Only for 8 bit devices - not delta!!! */
+ column -= 256;
+ ndcb0 |= NAND_CMD_READ1;
+ }
+ break;
case NAND_CMD_STATUS:
return;
case NAND_CMD_RESET:
return;
default:
- printk("delta_cmdfunc: error, unkown command issued.\n");
+ printk("delta_cmdfunc: error, unsupported command.\n");
return;
}
NDCB0 = ndcb0;
- NDCB1 = ndcb1;
- NDCB2 = ndcb2;
+ NDCB0 = ndcb1;
+ NDCB0 = ndcb2;
}
-void delta_dfc_gpio_init()
+static void delta_dfc_gpio_init()
{
printf("Setting up DFC GPIO's.\n");
@@ -216,6 +244,23 @@ void delta_dfc_gpio_init()
* Members with a "?" were not set in the merged testing-NAND branch,
* so they are not set here either.
*/
+void wait(unsigned long us)
+{
+#define OSCR_CLK_FREQ 3.250 /* kHz */
+
+ unsigned long start = OSCR;
+ unsigned long delta = 0, cur;
+ us *= OSCR_CLK_FREQ;
+
+ while (delta < us) {
+ cur = OSCR;
+ if(cur < start) /* OSCR overflowed */
+ delta = cur + (start^0xffffffff);
+ else
+ delta = cur - start;
+ }
+}
+
void board_nand_init(struct nand_chip *nand)
{
unsigned long tCH, tCS, tWH, tWP, tRH, tRP, tRP_high, tR, tWHR, tAR;
@@ -225,14 +270,24 @@ void board_nand_init(struct nand_chip *nand)
/* turn on the NAND Controller Clock (104 MHz @ D0) */
CKENA |= (CKENA_4_NAND | CKENA_9_SMC);
-
+
+ /* wait ? */
+/* printf("stupid loop start...\n"); */
+/* wait(200); */
+/* printf("stupid loop end.\n"); */
+
+
/* NAND Timing Parameters (in ns) */
#define NAND_TIMING_tCH 10
#define NAND_TIMING_tCS 0
#define NAND_TIMING_tWH 20
#define NAND_TIMING_tWP 40
-#define NAND_TIMING_tRH 20
-#define NAND_TIMING_tRP 40
+/* #define NAND_TIMING_tRH 20 */
+/* #define NAND_TIMING_tRP 40 */
+
+#define NAND_TIMING_tRH 25
+#define NAND_TIMING_tRP 50
+
#define NAND_TIMING_tR 11123
#define NAND_TIMING_tWHR 110
#define NAND_TIMING_tAR 10
@@ -274,6 +329,8 @@ void board_nand_init(struct nand_chip *nand)
DFC_MAX_tAR);
+ printf("tCH=%u, tCS=%u, tWH=%u, tWP=%u, tRH=%u, tRP=%u, tR=%u, tWHR=%u, tAR=%u.\n", tCH, tCS, tWH, tWP, tRH, tRP, tR, tWHR, tAR);
+
/* tRP value is split in the register */
if(tRP & (1 << 4)) {
tRP_high = 1;
@@ -307,33 +364,39 @@ void board_nand_init(struct nand_chip *nand)
* - cs don't care, see if we can enable later!
* - row address start position (after second cycle)
* - pages per block = 32
+ * - ND_RDY : clears command buffer
*/
- NDCR = (NDCR_ND_ARB_EN | /* enable bus arbiter */
- NDCR_SPARE_EN | /* use the spare area */
+ NDCR = (NDCR_SPARE_EN | /* use the spare area */
NDCR_DWIDTH_C | /* 16bit DFC data bus width */
NDCR_DWIDTH_M | /* 16 bit Flash device data bus width */
- (2 << 16) | /* read id count = 7 ???? mk@tbd */
- NDCE_RDYM | /* flash device ready ir masked */
- NDCE_CS0_PAGEDM | /* ND_nCSx page done ir masked */
- NDCE_CS1_PAGEDM |
- NDCE_CS0_CMDDM | /* ND_CSx command done ir masked */
- NDCE_CS1_CMDDM |
- NDCE_CS0_BBDM | /* ND_CSx bad block detect ir masked */
- NDCE_CS1_BBDM |
- NDCE_DBERRM | /* double bit error ir masked */
- NDCE_SBERRM | /* single bit error ir masked */
- NDCE_WRDREQM | /* write data request ir masked */
- NDCE_RDDREQM | /* read data request ir masked */
- NDCE_WRCMDREQM); /* write command request ir masked */
+ NDCR_NCSX | /* Chip select busy don't care */
+ (7 << 16) | /* read id count = 7 ???? mk@tbd */
+ NDCR_ND_ARB_EN | /* enable bus arbiter */
+ NDCR_RDYM | /* flash device ready ir masked */
+ NDCR_CS0_PAGEDM | /* ND_nCSx page done ir masked */
+ NDCR_CS1_PAGEDM |
+ NDCR_CS0_CMDDM | /* ND_CSx command done ir masked */
+ NDCR_CS1_CMDDM |
+ NDCR_CS0_BBDM | /* ND_CSx bad block detect ir masked */
+ NDCR_CS1_BBDM |
+ NDCR_DBERRM | /* double bit error ir masked */
+ NDCR_SBERRM | /* single bit error ir masked */
+ NDCR_WRDREQM | /* write data request ir masked */
+ NDCR_RDDREQM | /* read data request ir masked */
+ NDCR_WRCMDREQM); /* write command request ir masked */
+
+ /* wait 10 us due to cmd buffer clear reset */
+/* wait(10); */
nand->hwcontrol = delta_hwcontrol;
- nand->dev_ready = delta_device_ready;
+/* nand->dev_ready = delta_device_ready; */
nand->eccmode = NAND_ECC_SOFT;
nand->chip_delay = NAND_DELAY_US;
nand->options = NAND_BUSWIDTH_16;
nand->read_byte = delta_read_byte;
+ nand->read_buf = delta_read_buf;
nand->cmdfunc = delta_cmdfunc;
/* nand->options = NAND_SAMSUNG_LP_OPTIONS; */
}
generated by cgit v1.1 at 2024-11-20 08:25:47 +0000