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-rw-r--r--board/o2dnt/flash.c213
1 files changed, 189 insertions, 24 deletions
diff --git a/board/o2dnt/flash.c b/board/o2dnt/flash.c
index 64574f4..186e0d2 100644
--- a/board/o2dnt/flash.c
+++ b/board/o2dnt/flash.c
@@ -2,6 +2,10 @@
* (C) Copyright 2005
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
+ * flash_real_protect() routine based on boards/alaska/flash.c
+ * (C) Copyright 2001
+ * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
+ *
* See file CREDITS for list of people who contributed to this
* project.
*
@@ -23,29 +27,36 @@
#include <common.h>
-flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+/* Intel-compatible flash commands */
+#define INTEL_ERASE 0x20
+#define INTEL_PROGRAM 0x40
+#define INTEL_CLEAR 0x50
+#define INTEL_LOCKBIT 0x60
+#define INTEL_PROTECT 0x01
+#define INTEL_STATUS 0x70
+#define INTEL_READID 0x90
+#define INTEL_READID 0x90
+#define INTEL_SUSPEND 0xB0
+#define INTEL_CONFIRM 0xD0
+#define INTEL_RESET 0xFF
+
+/* Intel-compatible flash status bits */
+#define INTEL_FINISHED 0x80
+#define INTEL_OK 0x80
-/* NOTE - CONFIG_FLASH_16BIT means the CPU interface is 16-bit, it
- * has nothing to do with the flash chip being 8-bit or 16-bit.
- */
-#ifdef CONFIG_FLASH_16BIT
-typedef unsigned short FLASH_PORT_WIDTH;
-typedef volatile unsigned short FLASH_PORT_WIDTHV;
-#define FLASH_ID_MASK 0xFFFF
-#else
typedef unsigned char FLASH_PORT_WIDTH;
typedef volatile unsigned char FLASH_PORT_WIDTHV;
+#define FPW FLASH_PORT_WIDTH
+#define FPWV FLASH_PORT_WIDTHV
#define FLASH_ID_MASK 0xFF
-#endif
-
-#define FPW FLASH_PORT_WIDTH
-#define FPWV FLASH_PORT_WIDTHV
#define ORMASK(size) ((-size) & OR_AM_MSK)
#define FLASH_CYCLE1 0x0555
#define FLASH_CYCLE2 0x02aa
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+
/*-----------------------------------------------------------------------
* Functions
*/
@@ -53,6 +64,8 @@ static ulong flash_get_size(FPWV *addr, flash_info_t *info);
static void flash_reset(flash_info_t *info);
static flash_info_t *flash_get_info(ulong base);
static int write_data (flash_info_t *info, FPWV *dest, FPW data); /* O2D */
+static void flash_sync_real_protect (flash_info_t * info);
+static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);
/*-----------------------------------------------------------------------
* flash_init()
@@ -79,6 +92,9 @@ unsigned long flash_init (void)
flash_get_size((FPW *)CFG_FLASH_BASE, &flash_info[0]);
size += flash_info[0].size;
+ /* get the h/w and s/w protection status in sync */
+ flash_sync_real_protect(&flash_info[0]);
+
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
/* monitor protection ON by default */
flash_protect(FLAG_PROTECT_SET,
@@ -108,7 +124,7 @@ static void flash_reset(flash_info_t *info)
/* Put FLASH back in read mode */
if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
- *base = (FPW)0x00FF00FF; /* Intel Read Mode */
+ *base = (FPW) INTEL_RESET; /* Intel Read Mode */
}
/*-----------------------------------------------------------------------
@@ -204,7 +220,7 @@ ulong flash_get_size (FPWV *addr, flash_info_t *info)
/* Write auto select command: read Manufacturer ID */
/* Write auto select command sequence and test FLASH answer */
- addr[FLASH_CYCLE1] = (FPW)0x00900090; /* selects Intel or AMD */
+ addr[FLASH_CYCLE1] = (FPW) INTEL_READID; /* selects Intel or AMD */
/* The manufacturer codes are only 1 byte, so just use 1 byte.
* This works for any bus width and any FLASH device width.
@@ -298,9 +314,9 @@ int flash_erase (flash_info_t *info, int s_first, int s_last)
flag = disable_interrupts();
addr = (FPWV *)(info->start[sect]);
- *addr = (FPW)0x00500050; /* clear status register */
- *addr = (FPW)0x00200020; /* erase setup */
- *addr = (FPW)0x00D000D0; /* erase confirm */
+ *addr = (FPW) INTEL_CLEAR; /* clear status register */
+ *addr = (FPW) INTEL_ERASE; /* erase setup */
+ *addr = (FPW) INTEL_CONFIRM; /* erase confirm */
/* re-enable interrupts if necessary */
if (flag)
@@ -311,10 +327,10 @@ int flash_erase (flash_info_t *info, int s_first, int s_last)
/* wait at least 80us for Intel - let's wait 1 ms */
udelay (1000);
- while ((*addr & (FPW)0x00800080) != (FPW)0x00800080) {
+ while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
printf ("Timeout\n");
- *addr = (FPW)0x00B000B0;/* suspend erase */
+ *addr = (FPW) INTEL_SUSPEND;/* suspend erase */
flash_reset(info); /* reset to read mode */
rcode = 1; /* failed */
break;
@@ -401,23 +417,172 @@ static int write_data (flash_info_t *info, FPWV *dest, FPW data)
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts ();
- *addr = (FPW) 0x00400040; /* write setup */
+ *addr = (FPW) INTEL_PROGRAM; /* write setup */
*addr = data;
/* arm simple, non interrupt dependent timer */
start = get_timer(0);
/* wait while polling the status register */
- while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
+ while (((status = *addr) & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
- *addr = (FPW) 0x00FF00FF; /* restore read mode */
+ *addr = (FPW) INTEL_RESET; /* restore read mode */
return (1);
}
}
- *addr = (FPW) 0x00FF00FF; /* restore read mode */
+ *addr = (FPW) INTEL_RESET; /* restore read mode */
if (flag)
enable_interrupts();
return (0);
}
+
+
+/*-----------------------------------------------------------------------
+ * Set/Clear sector's lock bit, returns:
+ * 0 - OK
+ * 1 - Error (timeout, voltage problems, etc.)
+ */
+int flash_real_protect (flash_info_t * info, long sector, int prot)
+{
+ ulong start;
+ int i;
+ int rc = 0;
+ FPWV *addr = (FPWV *) (info->start[sector]);
+ int flag = disable_interrupts ();
+
+ *addr = INTEL_CLEAR; /* Clear status register */
+ if (prot) { /* Set sector lock bit */
+ *addr = INTEL_LOCKBIT; /* Sector lock bit */
+ *addr = INTEL_PROTECT; /* set */
+ } else { /* Clear sector lock bit */
+ *addr = INTEL_LOCKBIT; /* All sectors lock bits */
+ *addr = INTEL_CONFIRM; /* clear */
+ }
+
+ start = get_timer (0);
+
+ while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
+ if (get_timer (start) > CFG_FLASH_UNLOCK_TOUT) {
+ printf ("Flash lock bit operation timed out\n");
+ rc = 1;
+ break;
+ }
+ }
+
+ if (*addr != INTEL_OK) {
+ printf ("Flash lock bit operation failed at %08X, CSR=%08X\n",
+ (uint) addr, (uint) * addr);
+ rc = 1;
+ }
+
+ if (!rc)
+ info->protect[sector] = prot;
+
+ /*
+ * Clear lock bit command clears all sectors lock bits, so
+ * we have to restore lock bits of protected sectors.
+ */
+ if (!prot) {
+ for (i = 0; i < info->sector_count; i++) {
+ if (info->protect[i]) {
+ start = get_timer (0);
+ addr = (FPWV *) (info->start[i]);
+ *addr = INTEL_LOCKBIT; /* Sector lock bit */
+ *addr = INTEL_PROTECT; /* set */
+ while ((*addr & INTEL_FINISHED) !=
+ INTEL_FINISHED) {
+ if (get_timer (start) >
+ CFG_FLASH_UNLOCK_TOUT) {
+ printf ("Flash lock bit operation timed out\n");
+ rc = 1;
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ if (flag)
+ enable_interrupts ();
+
+ *addr = INTEL_RESET; /* Reset to read array mode */
+
+ return rc;
+}
+
+
+/*
+ * This function gets the u-boot flash sector protection status
+ * (flash_info_t.protect[]) in sync with the sector protection
+ * status stored in hardware.
+ */
+static void flash_sync_real_protect (flash_info_t * info)
+{
+ int i;
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_28F128J3A:
+ for (i = 0; i < info->sector_count; ++i) {
+ info->protect[i] = intel_sector_protected(info, i);
+ }
+ break;
+ default:
+ /* no h/w protect support */
+ break;
+ }
+}
+
+
+/*
+ * checks if "sector" in bank "info" is protected. Should work on intel
+ * strata flash chips 28FxxxJ3x in 8-bit mode.
+ * Returns 1 if sector is protected (or timed-out while trying to read
+ * protection status), 0 if it is not.
+ */
+static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
+{
+ FPWV *addr;
+ FPWV *lock_conf_addr;
+ ulong start;
+ unsigned char ret;
+
+ /*
+ * first, wait for the WSM to be finished. The rationale for
+ * waiting for the WSM to become idle for at most
+ * CFG_FLASH_ERASE_TOUT is as follows. The WSM can be busy
+ * because of: (1) erase, (2) program or (3) lock bit
+ * configuration. So we just wait for the longest timeout of
+ * the (1)-(3), i.e. the erase timeout.
+ */
+
+ /* wait at least 35ns (W12) before issuing Read Status Register */
+ udelay(1);
+ addr = (FPWV *) info->start[sector];
+ *addr = (FPW) INTEL_STATUS;
+
+ start = get_timer (0);
+ while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
+ if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
+ *addr = (FPW) INTEL_RESET; /* restore read mode */
+ printf("WSM busy too long, can't get prot status\n");
+ return 1;
+ }
+ }
+
+ /* issue the Read Identifier Codes command */
+ *addr = (FPW) INTEL_READID;
+
+ /* wait at least 35ns (W12) before reading */
+ udelay(1);
+
+ /* Intel example code uses offset of 4 for 8-bit flash */
+ lock_conf_addr = (FPWV *) info->start[sector] + 4;
+ ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;
+
+ /* put flash back in read mode */
+ *addr = (FPW) INTEL_RESET;
+
+ return ret;
+}
+
generated by cgit v1.1 at 2024-12-15 00:03:31 +0000