Initial revision

1 files changed, 644 insertions, 0 deletions

diff --git a/board/gen860t/flash.c b/board/gen860t/flash.c
new file mode 100644
index 0000000..902b1b0
--- /dev/null
+++ b/board/gen860t/flash.c
@@ -0,0 +1,644 @@
+/*
+ * (C) Copyright 2001
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * Keith Outwater, keith_outwater@mvsi.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+
+#if defined(CFG_ENV_IS_IN_FLASH)
+# ifndef  CFG_ENV_ADDR
+#  define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
+# endif
+# ifndef  CFG_ENV_SIZE
+#  define CFG_ENV_SIZE	CFG_ENV_SECT_SIZE
+# endif
+# ifndef  CFG_ENV_SECT_SIZE
+#  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
+# endif
+#endif
+
+/*
+ * Use buffered writes to flash by default - they are about 32x faster than
+ * single byte writes.
+ */
+#ifndef  CFG_GEN860T_FLASH_USE_WRITE_BUFFER
+#define CFG_GEN860T_FLASH_USE_WRITE_BUFFER
+#endif
+
+/*
+ * Max time to wait (in mS) for flash device to allocate a write buffer.
+ */
+#ifndef CFG_FLASH_ALLOC_BUFFER_TOUT
+#define CFG_FLASH_ALLOC_BUFFER_TOUT		100
+#endif
+
+/*
+ * These functions support a single Intel StrataFlash device (28F128J3A)
+ * in byte mode only!.  The flash routines are very basic and simple
+ * since there isn't really any remapping necessary.
+ */
+
+/*
+ * Intel SCS (Scalable Command Set) command definitions
+ * (taken from 28F128J3A datasheet)
+ */
+#define SCS_READ_CMD				0xff
+#define SCS_READ_ID_CMD				0x90
+#define SCS_QUERY_CMD				0x98
+#define SCS_READ_STATUS_CMD			0x70
+#define SCS_CLEAR_STATUS_CMD		0x50
+#define SCS_WRITE_BUF_CMD			0xe8
+#define SCS_PROGRAM_CMD				0x40
+#define SCS_BLOCK_ERASE_CMD			0x20
+#define SCS_BLOCK_ERASE_RESUME_CMD	0xd0
+#define SCS_PROGRAM_RESUME_CMD		0xd0
+#define SCS_BLOCK_ERASE_SUSPEND_CMD	0xb0
+#define SCS_SET_BLOCK_LOCK_CMD		0x60
+#define SCS_CLR_BLOCK_LOCK_CMD		0x60
+
+/*
+ * SCS status/extended status register bit definitions
+ */
+#define  SCS_SR7					0x80
+#define  SCS_XSR7					0x80
+
+/*---------------------------------------------------------------------*/
+#if 0
+#define DEBUG_FLASH
+#endif
+
+#ifdef DEBUG_FLASH
+#define PRINTF(fmt,args...) printf(fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+/*---------------------------------------------------------------------*/
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS];
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static ulong flash_get_size (vu_char *addr, flash_info_t *info);
+static int write_data8 (flash_info_t *info, ulong dest, uchar data);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+
+/*-----------------------------------------------------------------------
+ * Initialize the flash memory.
+ */
+unsigned long
+flash_init (void)
+{
+	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	unsigned long size_b0;
+	int i;
+
+	for (i= 0; i < CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+
+	/*
+	 * The gen860t board only has one FLASH memory device, so the
+	 * FLASH Bank configuration is done statically.
+	 */
+	PRINTF("\n## Get flash bank 1 size @ 0x%08x\n", FLASH_BASE0_PRELIM);
+	size_b0 = flash_get_size((vu_char *)FLASH_BASE0_PRELIM, &flash_info[0]);
+	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
+		printf ("## Unknown FLASH on Bank 0: "
+				"ID 0x%lx, Size = 0x%08lx = %ld MB\n",
+				flash_info[0].flash_id,size_b0, size_b0 << 20);
+	}
+
+	PRINTF("## Before remap:\n"
+		   "  BR0: 0x%08x    OR0: 0x%08x\n  BR1: 0x%08x    OR1: 0x%08x\n",
+		   memctl->memc_br0, memctl->memc_or0,
+		   memctl->memc_br1, memctl->memc_or1);
+
+	/*
+	 * Remap FLASH according to real size
+	 */
+	memctl->memc_or0 |= (-size_b0 & 0xFFFF8000);
+	memctl->memc_br0 |= (CFG_FLASH_BASE & BR_BA_MSK);
+
+	PRINTF("## After remap:\n"
+		   "  BR0: 0x%08x    OR0: 0x%08x\n", memctl->memc_br0, memctl->memc_or0);
+
+	/*
+	 * Re-do sizing to get full correct info
+	 */
+	size_b0 = flash_get_size ((vu_char *)CFG_FLASH_BASE, &flash_info[0]);
+	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
+	flash_info[0].size = size_b0;
+
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+	/*
+	 * Monitor protection is ON by default
+	 */
+	flash_protect(FLAG_PROTECT_SET,
+		      	  CFG_MONITOR_BASE,
+		      	  CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
+		      	  &flash_info[0]);
+#endif
+
+#ifdef	CFG_ENV_IS_IN_FLASH
+	/*
+	 * Environment protection ON by default
+	 */
+	flash_protect(FLAG_PROTECT_SET,
+		      	  CFG_ENV_ADDR,
+		      	  CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
+		      	  &flash_info[0]);
+#endif
+
+	PRINTF("## Final Flash bank size: 0x%08lx\n",size_b0);
+	return (size_b0);
+}
+
+
+/*-----------------------------------------------------------------------
+ * Fill in the FLASH offset table
+ */
+static void
+flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	if (info->flash_id == FLASH_UNKNOWN) {
+		return;
+	}
+
+	switch (info->flash_id & FLASH_VENDMASK) {
+		case FLASH_MAN_INTEL:
+	    	for (i = 0; i < info->sector_count; i++) {
+				info->start[i] = base;
+				base += 1024 * 128;
+	    	}
+	    	return;
+
+		default:
+	   		printf ("Don't know sector offsets for FLASH"
+			        " type 0x%lx\n", info->flash_id);
+	    return;
+	}
+}
+
+
+/*-----------------------------------------------------------------------
+ * Display FLASH device info
+ */
+void
+flash_print_info (flash_info_t *info)
+{
+	int i;
+
+	if (info->flash_id == FLASH_UNKNOWN) {
+		printf ("Missing or unknown FLASH type\n");
+		return;
+	}
+
+	switch (info->flash_id & FLASH_VENDMASK) {
+	case FLASH_MAN_INTEL:
+			printf ("Intel ");
+			break;
+	default:
+			printf ("Unknown Vendor ");
+			break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case FLASH_28F128J3A:
+			printf ("28F128J3A (128Mbit = 128K x 128)\n");
+			break;
+	default:
+			printf ("Unknown Chip Type\n");
+			break;
+	}
+
+	if (info->size >= (1024 * 1024)) {
+		i = 20;
+	} else {
+		i = 10;
+	}
+	printf ("  Size: %ld %cB in %d Sectors\n",
+			info->size >> i,
+			(i == 20) ? 'M' : 'k',
+			info->sector_count);
+
+	printf ("  Sector Start Addresses:");
+	for (i=0; i<info->sector_count; ++i) {
+		if ((i % 5) == 0)
+			printf ("\n   ");
+			printf (" %08lX%s",
+			info->start[i],
+			info->protect[i] ? " (RO)" : "     "
+		);
+	}
+	printf ("\n");
+	return;
+}
+
+
+/*-----------------------------------------------------------------------
+ * Get size and other information for a FLASH device.
+ * NOTE: The following code cannot be run from FLASH!
+ */
+static
+ulong flash_get_size (vu_char *addr, flash_info_t *info)
+{
+#define NO_FLASH	0
+
+	vu_char value[2];
+
+	/*
+	 * Try to read the manufacturer ID
+	 */
+	addr[0] = SCS_READ_CMD;
+	addr[0] = SCS_READ_ID_CMD;
+	value[0] = addr[0];
+	value[1] = addr[2];
+	addr[0] = SCS_READ_CMD;
+
+	PRINTF("Manuf. ID @ 0x%08lx: 0x%02x\n", (ulong)addr, value[0]);
+	switch (value[0]) {
+		case (INTEL_MANUFACT & 0xff):
+			info->flash_id = FLASH_MAN_INTEL;
+			break;
+		default:
+			info->flash_id = FLASH_UNKNOWN;
+			info->sector_count = 0;
+			info->size = 0;
+			return (NO_FLASH);
+	}
+
+	/*
+	 * Read the device ID
+	 */
+	PRINTF("Device ID @ 0x%08lx: 0x%02x\n", (ulong)(&addr[2]), value[1]);
+	switch (value[1]) {
+		case (INTEL_ID_28F128J3A & 0xff):
+			info->flash_id += FLASH_28F128J3A;
+			info->sector_count = 128;
+			info->size = 16 * 1024 * 1024;
+			break;
+
+		default:
+			info->flash_id = FLASH_UNKNOWN;
+			return (NO_FLASH);
+	}
+
+	if (info->sector_count > CFG_MAX_FLASH_SECT) {
+		printf ("** ERROR: sector count %d > max (%d) **\n",
+				info->sector_count, CFG_MAX_FLASH_SECT);
+				info->sector_count = CFG_MAX_FLASH_SECT;
+	}
+	return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ * Erase the specified sectors in the specified FLASH device
+ */
+int
+flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+	int flag, prot, sect;
+	ulong start, now, last;
+
+	if ((s_first < 0) || (s_first > s_last)) {
+		if (info->flash_id == FLASH_UNKNOWN) {
+			printf ("- missing\n");
+		} else {
+			printf ("- no sectors to erase\n");
+		}
+		return 1;
+	}
+
+	if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
+		printf ("Can erase only Intel flash types - aborted\n");
+		return 1;
+	}
+
+	prot = 0;
+	for (sect=s_first; sect<=s_last; ++sect) {
+		if (info->protect[sect]) {
+			prot++;
+		}
+	}
+
+	if (prot) {
+		printf ("- Warning: %d protected sectors will not be erased!\n",
+				prot);
+	} else {
+		printf ("\n");
+	}
+
+	start = get_timer (0);
+	last  = start;
+
+	/*
+	 * Start erase on unprotected sectors
+	 */
+	for (sect = s_first; sect<=s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			vu_char *addr = (uchar *)(info->start[sect]);
+			vu_char status;
+
+			/*
+			 * Disable interrupts which might cause a timeout
+			 */
+			flag = disable_interrupts();
+
+			*addr = SCS_CLEAR_STATUS_CMD;
+			*addr = SCS_BLOCK_ERASE_CMD;
+			*addr = SCS_BLOCK_ERASE_RESUME_CMD;
+
+			/*
+			 * Re-enable interrupts if necessary
+			 */
+			if (flag)
+				enable_interrupts();
+
+			/*
+			 * Wait at least 80us - let's wait 1 ms
+			 */
+			udelay (1000);
+
+			while (((status = *addr) & SCS_SR7) != SCS_SR7) {
+				if ((now=get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+					printf ("Timeout\n");
+					*addr = SCS_BLOCK_ERASE_SUSPEND_CMD;
+					*addr = SCS_READ_CMD;
+					return 1;
+				}
+
+				/*
+				 * Show that we're waiting
+				 */
+				if ((now - last) > 1000) {	/* 1 second */
+					putc ('.');
+					last = now;
+				}
+			}
+			*addr = SCS_READ_CMD;
+		}
+	}
+	printf (" done\n");
+	return 0;
+}
+
+
+#ifdef CFG_GEN860T_FLASH_USE_WRITE_BUFFER
+/*
+ * Allocate a flash buffer, fill it with data and write it to the flash.
+ * 0 - OK
+ * 1 - Timeout on buffer request
+ *
+ * NOTE: After the last call to this function, WSM status needs to be checked!
+ */
+static int
+write_flash_buffer8(flash_info_t *info_p, vu_char *src_p, vu_char *dest_p,
+				    uint count)
+{
+	vu_char *block_addr_p = NULL;
+	vu_char *start_addr_p = NULL;
+	ulong blocksize = info_p->size / (ulong)info_p->sector_count;
+
+	int i;
+	uint time = get_timer(0);
+
+	PRINTF("%s:%d: src: 0x%p dest: 0x%p  count: %d\n",
+		   __FUNCTION__, __LINE__, src_p, dest_p, count);
+
+	/*
+	 * What block are we in? We already know that the source address is
+	 * in the flash address range, but we also can't cross a block boundary.
+	 * We assume that the block does not cross a boundary (we'll check before
+	 * calling this function).
+	 */
+ 	for (i = 0; i < info_p->sector_count; ++i) {
+		if ( ((ulong)dest_p >= info_p->start[i]) &&
+		    ((ulong)dest_p < (info_p->start[i] + blocksize)) ) {
+			PRINTF("%s:%d: Dest addr 0x%p is in block %d @ 0x%.8lx\n",
+				   __FUNCTION__, __LINE__, dest_p, i, info_p->start[i]);
+			block_addr_p = (vu_char *)info_p->start[i];
+			break;
+		}
+	}
+
+	/*
+	 * Request a buffer
+	 */
+	*block_addr_p = SCS_WRITE_BUF_CMD;
+	while ((*block_addr_p & SCS_XSR7) != SCS_XSR7) {
+		if (get_timer(time) >  CFG_FLASH_ALLOC_BUFFER_TOUT) {
+			PRINTF("%s:%d: Buffer allocation timeout @ 0x%p (waited %d mS)\n",
+				   __FUNCTION__, __LINE__, block_addr_p,
+				   CFG_FLASH_ALLOC_BUFFER_TOUT);
+			return 1;
+		}
+		*block_addr_p = SCS_WRITE_BUF_CMD;
+	}
+
+	/*
+	 * Fill the buffer with data
+	 */
+	start_addr_p = dest_p;
+	*block_addr_p = count - 1; /* flash device wants count - 1 */
+	PRINTF("%s:%d: Fill buffer at block addr 0x%p\n",
+		   __FUNCTION__, __LINE__, block_addr_p);
+	for (i = 0; i < count; i++) {
+		*start_addr_p++ = *src_p++;
+	}
+
+	/*
+	 * Flush buffer to flash
+	 */
+	*block_addr_p = SCS_PROGRAM_RESUME_CMD;
+#if 1
+	time = get_timer(0);
+	while ((*block_addr_p & SCS_SR7) != SCS_SR7) {
+		if (get_timer(time) >  CFG_FLASH_WRITE_TOUT) {
+			PRINTF("%s:%d: Write timeout @ 0x%p (waited %d mS)\n",
+				   __FUNCTION__, __LINE__, block_addr_p, CFG_FLASH_WRITE_TOUT);
+			return 1;
+		}
+	}
+
+#endif
+	return 0;
+}
+#endif
+
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ * 4 - Flash not identified
+ */
+int
+write_buff(flash_info_t *info_p, uchar *src_p, ulong addr, ulong count)
+{
+	int rc = 0;
+#ifdef CFG_GEN860T_FLASH_USE_WRITE_BUFFER
+#define FLASH_WRITE_BUF_SIZE	0x00000020	/* 32 bytes */
+	int i;
+	uint bufs;
+	ulong buf_count;
+	vu_char *sp;
+	vu_char *dp;
+#else
+	ulong wp;
+#endif
+
+	PRINTF("\n%s:%d: src: 0x%.8lx dest: 0x%.8lx size: %d (0x%.8lx)\n",
+		   __FUNCTION__, __LINE__, (ulong)src_p, addr, (uint)count, count);
+
+	if (info_p->flash_id == FLASH_UNKNOWN) {
+		return 4;
+	}
+
+#ifdef CFG_GEN860T_FLASH_USE_WRITE_BUFFER
+	sp = src_p;
+	dp = (uchar *)addr;
+
+	/*
+	 * For maximum performance, we want to align the start address to
+	 * the beginning of a write buffer boundary (i.e. A4-A0 of the
+	 * start address = 0). See how many bytes are required to get to a
+	 * write-buffer-aligned address.  If that number is non-zero, do
+	 * non buffered writes of the non-aligned data.  By doing non-buffered
+	 * writes, we avoid the problem of crossing a block (sector) boundary
+	 * with buffered writes.
+	 */
+	buf_count = FLASH_WRITE_BUF_SIZE - (addr & (FLASH_WRITE_BUF_SIZE - 1));
+	if (buf_count == FLASH_WRITE_BUF_SIZE) { /* already on a boundary */
+		buf_count = 0;
+	}
+	if (buf_count > count) { /* not a full buffers worth of data to write */
+		buf_count = count;
+	}
+	count -= buf_count;
+
+	PRINTF("%s:%d: Write buffer alignment count = %ld\n",
+		   __FUNCTION__, __LINE__, buf_count);
+	while (buf_count-- >= 1) {
+		if ((rc = write_data8(info_p, (ulong)dp++, *sp++)) != 0)  {
+			return (rc);
+		}
+	}
+
+	PRINTF("%s:%d: count = %ld\n", __FUNCTION__, __LINE__, count);
+	if (count == 0) { /* all done */
+		PRINTF("%s:%d: Less than 1 buffer (%d) worth of bytes\n",
+			   __FUNCTION__, __LINE__, FLASH_WRITE_BUF_SIZE);
+		return (rc);
+	}
+
+	/*
+	 * Now that we are write buffer aligned, write full or partial buffers.
+	 * The fact that we are write buffer aligned automatically avoids
+	 * crossing a block address during a write buffer operation.
+	 */
+	bufs = count / FLASH_WRITE_BUF_SIZE;
+	PRINTF("%s:%d: %d (0x%x) buffers to write\n", __FUNCTION__, __LINE__,
+		   bufs, bufs);
+	while (bufs >= 1) {
+		rc = write_flash_buffer8(info_p, sp, dp, FLASH_WRITE_BUF_SIZE);
+		if (rc != 0) {
+			PRINTF("%s:%d: ** Error writing buf %d\n",
+				   __FUNCTION__, __LINE__, bufs);
+			return (rc);
+		}
+		bufs--;
+		sp += FLASH_WRITE_BUF_SIZE;
+		dp += FLASH_WRITE_BUF_SIZE;
+	}
+
+	/*
+	 * Do the leftovers
+	 */
+	i = count % FLASH_WRITE_BUF_SIZE;
+	PRINTF("%s:%d: %d (0x%x) leftover bytes\n", __FUNCTION__, __LINE__, i, i);
+	if (i > 0) {
+		rc = write_flash_buffer8(info_p, sp, dp, i);
+	}
+
+	sp = (vu_char*)info_p->start[0];
+	*sp = SCS_READ_CMD;
+	return (rc);
+
+#else
+	wp = addr;
+	while (count-- >= 1) {
+		if((rc = write_data8(info_p, wp++, *src_p++)) != 0)
+			return (rc);
+	}
+	return 0;
+#endif
+}
+
+
+/*-----------------------------------------------------------------------
+ * Write a byte to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int
+write_data8 (flash_info_t *info, ulong dest, uchar data)
+{
+	vu_char *addr = (vu_char *)dest;
+	vu_char status;
+	ulong start;
+	int flag;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*addr & data) != data) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	*addr = SCS_PROGRAM_CMD;
+	*addr = data;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	start = get_timer (0);
+
+	while (((status = *addr) & SCS_SR7) != SCS_SR7) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			*addr = SCS_READ_CMD;
+			return (1);
+		}
+	}
+	*addr = SCS_READ_CMD;
+	return (0);
+}
+
+/* vim: set ts=4 sw=4 tw=78: */