summaryrefslogtreecommitdiff
path: root/board/sc520_spunk/flash.c
diff options
context:
space:
mode:
Diffstat (limited to 'board/sc520_spunk/flash.c')
-rw-r--r--board/sc520_spunk/flash.c813
1 files changed, 813 insertions, 0 deletions
diff --git a/board/sc520_spunk/flash.c b/board/sc520_spunk/flash.c
new file mode 100644
index 0000000..66ef720
--- /dev/null
+++ b/board/sc520_spunk/flash.c
@@ -0,0 +1,813 @@
+/*
+ * (C) Copyright 2002, 2003
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * 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 <asm/io.h>
+#include <pci.h>
+#include <asm/ic/sc520.h>
+
+#define PROBE_BUFFER_SIZE 1024
+static unsigned char buffer[PROBE_BUFFER_SIZE];
+
+
+#define SC520_MAX_FLASH_BANKS 1
+#define SC520_FLASH_BANK0_BASE 0x38000000 /* BOOTCS */
+#define SC520_FLASH_BANKSIZE 0x8000000
+
+#define A29LV641DH_SIZE 0x800000
+#define A29LV641DH_SECTORS 128
+
+#define A29LV641MH_SIZE 0x800000
+#define A29LV641MH_SECTORS 128
+
+#define I28F320J3A_SIZE 0x400000
+#define I28F320J3A_SECTORS 32
+
+#define I28F640J3A_SIZE 0x800000
+#define I28F640J3A_SECTORS 64
+
+#define I28F128J3A_SIZE 0x1000000
+#define I28F128J3A_SECTORS 128
+
+flash_info_t flash_info[SC520_MAX_FLASH_BANKS];
+
+#define READY 1
+#define ERR 2
+#define TMO 4
+
+/*-----------------------------------------------------------------------
+ */
+
+
+static u32 _probe_flash(u32 addr, u32 bw, int il)
+{
+ u32 result=0;
+
+ /* First do an unlock cycle for the benefit of
+ * devices that need it */
+
+ switch (bw) {
+
+ case 1:
+ *(volatile u8*)(addr+0x5555) = 0xaa;
+ *(volatile u8*)(addr+0x2aaa) = 0x55;
+ *(volatile u8*)(addr+0x5555) = 0x90;
+
+ /* Read vendor */
+ result = *(volatile u8*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u8*)(addr+2);
+
+ /* Return device to data mode */
+ *(volatile u8*)addr = 0xff;
+ *(volatile u8*)(addr+0x5555), 0xf0;
+ break;
+
+ case 2:
+ *(volatile u16*)(addr+0xaaaa) = 0xaaaa;
+ *(volatile u16*)(addr+0x5554) = 0x5555;
+
+ /* Issue identification command */
+ if (il == 2) {
+ *(volatile u16*)(addr+0xaaaa) = 0x9090;
+
+ /* Read vendor */
+ result = *(volatile u8*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u8*)(addr+2);
+
+ /* Return device to data mode */
+ *(volatile u16*)addr = 0xffff;
+ *(volatile u16*)(addr+0xaaaa), 0xf0f0;
+
+ } else {
+ *(volatile u8*)(addr+0xaaaa) = 0x90;
+ /* Read vendor */
+ result = *(volatile u16*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u16*)(addr+2);
+
+ /* Return device to data mode */
+ *(volatile u8*)addr = 0xff;
+ *(volatile u8*)(addr+0xaaaa), 0xf0;
+ }
+
+ break;
+
+ case 4:
+ *(volatile u32*)(addr+0x5554) = 0xaaaaaaaa;
+ *(volatile u32*)(addr+0xaaa8) = 0x55555555;
+
+ switch (il) {
+ case 1:
+ /* Issue identification command */
+ *(volatile u8*)(addr+0x5554) = 0x90;
+
+ /* Read vendor */
+ result = *(volatile u16*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u16*)(addr+4);
+
+ /* Return device to data mode */
+ *(volatile u8*)addr = 0xff;
+ *(volatile u8*)(addr+0x5554), 0xf0;
+ break;
+
+ case 2:
+ /* Issue identification command */
+ *(volatile u32*)(addr + 0x5554) = 0x00900090;
+
+ /* Read vendor */
+ result = *(volatile u16*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u16*)(addr+4);
+
+ /* Return device to data mode */
+ *(volatile u32*)addr = 0x00ff00ff;
+ *(volatile u32*)(addr+0x5554), 0x00f000f0;
+ break;
+
+ case 4:
+ /* Issue identification command */
+ *(volatile u32*)(addr+0x5554) = 0x90909090;
+
+ /* Read vendor */
+ result = *(volatile u8*)addr;
+ result <<= 16;
+
+ /* Read device */
+ result |= *(volatile u8*)(addr+4);
+
+ /* Return device to data mode */
+ *(volatile u32*)addr = 0xffffffff;
+ *(volatile u32*)(addr+0x5554), 0xf0f0f0f0;
+ break;
+ }
+ break;
+ }
+
+
+
+ return result;
+}
+
+extern int _probe_flash_end;
+asm ("_probe_flash_end:\n"
+ ".long 0\n");
+
+static int identify_flash(unsigned address, int width)
+{
+ int is;
+ int device;
+ int vendor;
+ int size;
+ unsigned res;
+
+ u32 (*_probe_flash_ptr)(u32 a, u32 bw, int il);
+
+ size = (unsigned)&_probe_flash_end - (unsigned)_probe_flash;
+
+ if (size > PROBE_BUFFER_SIZE) {
+ printf("_probe_flash() routine too large (%d) %p - %p\n",
+ size, &_probe_flash_end, _probe_flash);
+ return 0;
+ }
+
+ memcpy(buffer, _probe_flash, size);
+ _probe_flash_ptr = (void*)buffer;
+
+ is = disable_interrupts();
+ res = _probe_flash_ptr(address, width, 1);
+ if (is) {
+ enable_interrupts();
+ }
+
+
+ vendor = res >> 16;
+ device = res & 0xffff;
+
+
+ return res;
+}
+
+ulong flash_init(void)
+{
+ int i, j;
+ ulong size = 0;
+
+ for (i = 0; i < SC520_MAX_FLASH_BANKS; i++) {
+ unsigned id;
+ ulong flashbase = 0;
+ int sectsize = 0;
+
+ memset(flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
+ switch (i) {
+ case 0:
+ flashbase = SC520_FLASH_BANK0_BASE;
+ break;
+ default:
+ panic("configured to many flash banks!\n");
+ }
+
+ id = identify_flash(flashbase, 2);
+ switch (id) {
+ case 0x000122d7:
+ /* 29LV641DH */
+ flash_info[i].flash_id =
+ (AMD_MANUFACT & FLASH_VENDMASK) |
+ (AMD_ID_LV640U & FLASH_TYPEMASK);
+
+ flash_info[i].size = A29LV641DH_SIZE;
+ flash_info[i].sector_count = A29LV641DH_SECTORS;
+ sectsize = A29LV641DH_SIZE/A29LV641DH_SECTORS;
+ printf("Bank %d: AMD 29LV641DH\n", i);
+ break;
+
+ case 0x0001227E:
+ /* 29LV641MH */
+ flash_info[i].flash_id =
+ (AMD_MANUFACT & FLASH_VENDMASK) |
+ (AMD_ID_DL640 & FLASH_TYPEMASK);
+
+ flash_info[i].size = A29LV641MH_SIZE;
+ flash_info[i].sector_count = A29LV641MH_SECTORS;
+ sectsize = A29LV641MH_SIZE/A29LV641MH_SECTORS;
+ printf("Bank %d: AMD 29LV641MH\n", i);
+ break;
+
+ case 0x00890016:
+ /* 28F320J3A */
+ flash_info[i].flash_id =
+ (INTEL_MANUFACT & FLASH_VENDMASK) |
+ (INTEL_ID_28F320J3A & FLASH_TYPEMASK);
+
+ flash_info[i].size = I28F320J3A_SIZE;
+ flash_info[i].sector_count = I28F320J3A_SECTORS;
+ sectsize = I28F320J3A_SIZE/I28F320J3A_SECTORS;
+ printf("Bank %d: Intel 28F320J3A\n", i);
+ break;
+
+ case 0x00890017:
+ /* 28F640J3A */
+ flash_info[i].flash_id =
+ (INTEL_MANUFACT & FLASH_VENDMASK) |
+ (INTEL_ID_28F640J3A & FLASH_TYPEMASK);
+
+ flash_info[i].size = I28F640J3A_SIZE;
+ flash_info[i].sector_count = I28F640J3A_SECTORS;
+ sectsize = I28F640J3A_SIZE/I28F640J3A_SECTORS;
+ printf("Bank %d: Intel 28F640J3A\n", i);
+ break;
+
+ case 0x00890018:
+ /* 28F128J3A */
+ flash_info[i].flash_id =
+ (INTEL_MANUFACT & FLASH_VENDMASK) |
+ (INTEL_ID_28F128J3A & FLASH_TYPEMASK);
+
+ flash_info[i].size = I28F128J3A_SIZE;
+ flash_info[i].sector_count = I28F128J3A_SECTORS;
+ sectsize = I28F128J3A_SIZE/I28F128J3A_SECTORS;
+ printf("Bank %d: Intel 28F128J3A\n", i);
+ break;
+
+ default:
+ printf("Bank %d have unknown flash %08x\n", i, id);
+ flash_info[i].flash_id = FLASH_UNKNOWN;
+ continue;
+ }
+
+ for (j = 0; j < flash_info[i].sector_count; j++) {
+ flash_info[i].start[j] = flashbase + j * sectsize;
+ }
+ size += flash_info[i].size;
+
+ flash_protect(FLAG_PROTECT_CLEAR,
+ flash_info[i].start[0],
+ flash_info[i].start[0] + flash_info[i].size - 1,
+ &flash_info[i]);
+ }
+
+ /*
+ * Protect monitor and environment sectors
+ */
+ flash_protect(FLAG_PROTECT_SET,
+ i386boot_start,
+ i386boot_end,
+ &flash_info[0]);
+#ifdef CFG_ENV_ADDR
+ flash_protect(FLAG_PROTECT_SET,
+ CFG_ENV_ADDR,
+ CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+ &flash_info[0]);
+#endif
+ return size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info(flash_info_t *info)
+{
+ int i;
+
+ switch (info->flash_id & FLASH_VENDMASK) {
+ case (INTEL_MANUFACT & FLASH_VENDMASK):
+ printf("INTEL: ");
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case (INTEL_ID_28F320J3A & FLASH_TYPEMASK):
+ printf("1x I28F320J3A (32Mbit)\n");
+ break;
+ case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
+ printf("1x I28F640J3A (64Mbit)\n");
+ break;
+ case (INTEL_ID_28F128J3A & FLASH_TYPEMASK):
+ printf("1x I28F128J3A (128Mbit)\n");
+ break;
+ default:
+ printf("Unknown Chip Type\n");
+ goto done;
+ break;
+ }
+
+ break;
+
+ case (AMD_MANUFACT & FLASH_VENDMASK):
+ printf("AMD: ");
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case (AMD_ID_LV640U & FLASH_TYPEMASK):
+ printf("1x AMD29LV641DH (64Mbit)\n");
+ break;
+ case (AMD_ID_DL640 & FLASH_TYPEMASK):
+ printf("1x AMD29LV641MH (64Mbit)\n");
+ break;
+ default:
+ printf("Unknown Chip Type\n");
+ goto done;
+ break;
+ }
+
+ break;
+ default:
+ printf("Unknown Vendor ");
+ break;
+ }
+
+
+ printf(" Size: %ld MB in %d Sectors\n",
+ info->size >> 20, 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");
+
+ done:
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+
+static u32 _amd_erase_flash(u32 addr, u32 sector)
+{
+ unsigned elapsed;
+
+ /* Issue erase */
+ *(volatile u16*)(addr + 0xaaaa) = 0x00AA;
+ *(volatile u16*)(addr + 0x5554) = 0x0055;
+ *(volatile u16*)(addr + 0xaaaa) = 0x0080;
+ /* And one unlock */
+ *(volatile u16*)(addr + 0xaaaa) = 0x00AA;
+ *(volatile u16*)(addr + 0x5554) = 0x0055;
+ /* Sector erase command comes last */
+ *(volatile u16*)(addr + sector) = 0x0030;
+
+ elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+ elapsed = 0;
+ while (((*(volatile u16*)(addr + sector)) & 0x0080) != 0x0080) {
+
+ elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+ if (elapsed > ((CFG_FLASH_ERASE_TOUT/CFG_HZ) * 1000)) {
+ *(volatile u16*)(addr) = 0x00f0;
+ return 1;
+ }
+ }
+
+ *(volatile u16*)(addr) = 0x00f0;
+
+ return 0;
+}
+
+extern int _amd_erase_flash_end;
+asm ("_amd_erase_flash_end:\n"
+ ".long 0\n");
+
+/* this needs to be inlined, the SWTMRMMILLI register is reset by each read */
+#define __udelay(delay) \
+{ \
+ unsigned micro; \
+ unsigned milli=0; \
+ \
+ micro = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); \
+ \
+ for (;;) { \
+ \
+ milli += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); \
+ micro = *(volatile u16*)(0xfffef000+SC520_SWTMRMICRO); \
+ \
+ if ((delay) <= (micro + (milli * 1000))) { \
+ break; \
+ } \
+ } \
+} while (0)
+
+static u32 _intel_erase_flash(u32 addr, u32 sector)
+{
+ unsigned elapsed;
+
+ *(volatile u16*)(addr + sector) = 0x0050; /* clear status register */
+ *(volatile u16*)(addr + sector) = 0x0020; /* erase setup */
+ *(volatile u16*)(addr + sector) = 0x00D0; /* erase confirm */
+
+
+ /* Wait at least 80us - let's wait 1 ms */
+ __udelay(1000);
+
+ elapsed = 0;
+ while (((*(volatile u16*)(addr + sector)) & 0x0080) != 0x0080) {
+ elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+ if (elapsed > ((CFG_FLASH_ERASE_TOUT/CFG_HZ) * 1000)) {
+ *(volatile u16*)(addr + sector) = 0x00B0; /* suspend erase */
+ *(volatile u16*)(addr + sector) = 0x00FF; /* reset to read mode */
+ return 1;
+ }
+ }
+
+ *(volatile u16*)(addr + sector) = 0x00FF; /* reset to read mode */
+
+ return 0;
+}
+
+
+extern int _intel_erase_flash_end;
+asm ("_intel_erase_flash_end:\n"
+ ".long 0\n");
+
+int flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+ u32 (*_erase_flash_ptr)(u32 a, u32 so);
+ int prot;
+ int sect;
+ unsigned size;
+
+ 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) == (AMD_MANUFACT & FLASH_VENDMASK)) {
+ size = (unsigned)&_amd_erase_flash_end - (unsigned)_amd_erase_flash;
+
+ if (size > PROBE_BUFFER_SIZE) {
+ printf("_amd_erase_flash() routine too large (%d) %p - %p\n",
+ size, &_amd_erase_flash_end, _amd_erase_flash);
+ return 0;
+ }
+
+ memcpy(buffer, _amd_erase_flash, size);
+ _erase_flash_ptr = (void*)buffer;
+
+ } else if ((info->flash_id & FLASH_VENDMASK) == (INTEL_MANUFACT & FLASH_VENDMASK)) {
+ size = (unsigned)&_intel_erase_flash_end - (unsigned)_intel_erase_flash;
+
+ if (size > PROBE_BUFFER_SIZE) {
+ printf("_intel_erase_flash() routine too large (%d) %p - %p\n",
+ size, &_intel_erase_flash_end, _intel_erase_flash);
+ return 0;
+ }
+
+ memcpy(buffer, _intel_erase_flash, size);
+ _erase_flash_ptr = (void*)buffer;
+ } else {
+ printf ("Can't erase unknown flash type - 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 erase on unprotected sectors */
+ for (sect = s_first; sect<=s_last; sect++) {
+
+ if (info->protect[sect] == 0) { /* not protected */
+ int res;
+ int flag;
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ res = _erase_flash_ptr(info->start[0], info->start[sect]-info->start[0]);
+
+ /* re-enable interrupts if necessary */
+ if (flag) {
+ enable_interrupts();
+ }
+
+
+ if (res) {
+ printf("Erase timed out, sector %d\n", sect);
+ return res;
+ }
+
+ putc('.');
+ }
+ }
+
+
+ return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int _amd_write_word(unsigned start, unsigned dest, unsigned data)
+{
+ volatile u16 *addr2 = (u16*)start;
+ volatile u16 *dest2 = (u16*)dest;
+ volatile u16 *data2 = (u16*)&data;
+ int i;
+ unsigned elapsed;
+
+ /* Check if Flash is (sufficiently) erased */
+ if ((*((volatile u16*)dest) & (u16)data) != (u16)data) {
+ return 2;
+ }
+
+ for (i = 0; i < 2; i++) {
+
+
+ addr2[0x5555] = 0x00AA;
+ addr2[0x2aaa] = 0x0055;
+ addr2[0x5555] = 0x00A0;
+
+ dest2[i] = (data >> (i*16)) & 0xffff;
+
+ elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+ elapsed = 0;
+
+ /* data polling for D7 */
+ while ((dest2[i] & 0x0080) != (data2[i] & 0x0080)) {
+ elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+ if (elapsed > ((CFG_FLASH_WRITE_TOUT/CFG_HZ) * 1000)) {
+ addr2[i] = 0x00f0;
+ return 1;
+ }
+ }
+ }
+
+ addr2[i] = 0x00f0;
+
+ return 0;
+}
+
+extern int _amd_write_word_end;
+asm ("_amd_write_word_end:\n"
+ ".long 0\n");
+
+
+
+static int _intel_write_word(unsigned start, unsigned dest, unsigned data)
+{
+ int i;
+ unsigned elapsed;
+
+ /* Check if Flash is (sufficiently) erased */
+ if ((*((volatile u16*)dest) & (u16)data) != (u16)data) {
+ return 2;
+ }
+
+ for (i = 0; i < 2; i++) {
+
+ *(volatile u16*)(dest+2*i) = 0x0040; /* write setup */
+ *(volatile u16*)(dest+2*i) = (data >> (i*16)) & 0xffff;
+
+ elapsed = *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI); /* dummy read */
+ elapsed = 0;
+
+ /* data polling for D7 */
+ while ((*(volatile u16*)dest & 0x0080) != 0x0080) {
+ elapsed += *(volatile u16*)(0xfffef000+SC520_SWTMRMILLI);
+ if (elapsed > ((CFG_FLASH_WRITE_TOUT/CFG_HZ) * 1000)) {
+ *(volatile u16*)dest = 0x00ff;
+ return 1;
+ }
+ }
+ }
+
+ *(volatile u16*)dest = 0x00ff;
+
+
+ return 0;
+
+}
+
+extern int _intel_write_word_end;
+asm ("_intel_write_word_end:\n"
+ ".long 0\n");
+
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ * 3 - Unsupported flash type
+ */
+
+int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+ ulong cp, wp, data;
+ int i, l, rc;
+ int flag;
+ u32 (*_write_word_ptr)(unsigned start, unsigned dest, unsigned data);
+ unsigned size;
+
+ if ((info->flash_id & FLASH_VENDMASK) == (AMD_MANUFACT & FLASH_VENDMASK)) {
+ size = (unsigned)&_amd_write_word_end - (unsigned)_amd_write_word;
+
+ if (size > PROBE_BUFFER_SIZE) {
+ printf("_amd_write_word() routine too large (%d) %p - %p\n",
+ size, &_amd_write_word_end, _amd_write_word);
+ return 0;
+ }
+
+ memcpy(buffer, _amd_write_word, size);
+ _write_word_ptr = (void*)buffer;
+
+ } else if ((info->flash_id & FLASH_VENDMASK) == (INTEL_MANUFACT & FLASH_VENDMASK)) {
+ size = (unsigned)&_intel_write_word_end - (unsigned)_intel_write_word;
+
+ if (size > PROBE_BUFFER_SIZE) {
+ printf("_intel_write_word() routine too large (%d) %p - %p\n",
+ size, &_intel_write_word_end, _intel_write_word);
+ return 0;
+ }
+
+ memcpy(buffer, _intel_write_word, size);
+ _write_word_ptr = (void*)buffer;
+ } else {
+ printf ("Can't program unknown flash type - aborted\n");
+ return 3;
+ }
+
+
+ wp = (addr & ~3); /* get lower word aligned address */
+
+
+ /*
+ * handle unaligned start bytes
+ */
+ if ((l = addr - wp) != 0) {
+ data = 0;
+ for (i=0, cp=wp; i<l; ++i, ++cp) {
+ data |= (*(uchar *)cp) << (8*i);
+ }
+ for (; i<4 && cnt>0; ++i) {
+ data |= *src++ << (8*i);
+ --cnt;
+ ++cp;
+ }
+ for (; cnt==0 && i<4; ++i, ++cp) {
+ data |= (*(uchar *)cp) << (8*i);
+ }
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ rc = _write_word_ptr(info->start[0], wp, data);
+
+ /* re-enable interrupts if necessary */
+ if (flag) {
+ enable_interrupts();
+ }
+ if (rc != 0) {
+ return rc;
+ }
+ wp += 4;
+ }
+
+ /*
+ * handle word aligned part
+ */
+ while (cnt >= 4) {
+ data = 0;
+
+ for (i=0; i<4; ++i) {
+ data |= *src++ << (8*i);
+ }
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ rc = _write_word_ptr(info->start[0], wp, data);
+
+ /* re-enable interrupts if necessary */
+ if (flag) {
+ enable_interrupts();
+ }
+ if (rc != 0) {
+ return rc;
+ }
+ wp += 4;
+ cnt -= 4;
+ }
+
+ if (cnt == 0) {
+ return 0;
+ }
+
+ /*
+ * handle unaligned tail bytes
+ */
+ data = 0;
+ for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+ data |= *src++ << (8*i);
+ --cnt;
+ }
+
+ for (; i<4; ++i, ++cp) {
+ data |= (*(uchar *)cp) << (8*i);
+ }
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ rc = _write_word_ptr(info->start[0], wp, data);
+
+ /* re-enable interrupts if necessary */
+ if (flag) {
+ enable_interrupts();
+ }
+
+ return rc;
+
+}
+
+
generated by cgit v1.1 at 2024-11-23 00:21:56 +0000