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+/*
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+ * (C) Copyright 2010
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+ * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
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+ *
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+ * See file CREDITS for list of people who contributed to this
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+ * project.
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License as
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+ * published by the Free Software Foundation; either version 2 of
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+ * the License, or (at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, write to the Free Software
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+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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+ * MA 02111-1307 USA
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+ */
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+
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+/*
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+ * this driver supports the enhanced embedded flash in the Atmel
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+ * AT91SAM9XE devices with the following geometry:
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+ *
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+ * AT91SAM9XE128: 1 plane of 8 regions of 32 pages (total 256 pages)
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+ * AT91SAM9XE256: 1 plane of 16 regions of 32 pages (total 512 pages)
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+ * AT91SAM9XE512: 1 plane of 32 regions of 32 pages (total 1024 pages)
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+ * (the exact geometry is read from the flash at runtime, so any
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+ * future devices should already be covered)
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+ *
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+ * Regions can be write/erase protected.
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+ * Whole (!) pages can be individually written with erase on the fly.
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+ * Writing partial pages will corrupt the rest of the page.
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+ *
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+ * The flash is presented to u-boot with each region being a sector,
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+ * having the following effects:
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+ * Each sector can be hardware protected (protect on/off).
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+ * Each page in a sector can be rewritten anytime.
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+ * Since pages are erased when written, the "erase" does nothing.
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+ * The first "CONFIG_EFLASH_PROTSECTORS" cannot be unprotected
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+ * by u-Boot commands.
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+ *
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+ * Note: Redundant environment will not work in this flash since
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+ * it does use partial page writes. Make sure the environent spans
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+ * whole pages!
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+ */
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+
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+/*
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+ * optional TODOs (nice to have features):
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+ *
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+ * make the driver coexist with other NOR flash drivers
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+ * (use an index into flash_info[], requires work
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+ * in those other drivers, too)
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+ * Make the erase command fill the sectors with 0xff
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+ * (if the flashes grow larger in the future and
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+ * someone puts a jffs2 into them)
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+ * do a read-modify-write for partially programmed pages
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+ */
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+#include <common.h>
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+#include <asm/arch/hardware.h>
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+#include <asm/arch/io.h>
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+#include <asm/arch/at91_common.h>
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+#include <asm/arch/at91_eefc.h>
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+#include <asm/arch/at91_dbu.h>
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+
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+/* checks to detect configuration errors */
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+#if CONFIG_SYS_MAX_FLASH_BANKS!=1
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+#error eflash: this driver can only handle 1 bank
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+#endif
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+
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+/* global structure */
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+flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
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+static u32 pagesize;
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+
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+unsigned long flash_init (void)
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+{
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+ at91_eefc_t *eefc = (at91_eefc_t *) 0xfffffa00;
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+ at91_dbu_t *dbu = (at91_dbu_t *) 0xfffff200;
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+ u32 id, size, nplanes, planesize, nlocks;
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+ u32 addr, i, tmp=0;
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+
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+ debug("eflash: init\n");
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+
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+ flash_info[0].flash_id = FLASH_UNKNOWN;
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+
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+ /* check if its an AT91ARM9XE SoC */
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+ if ((readl(&dbu->cidr) & AT91_DBU_CID_ARCH_MASK) != AT91_DBU_CID_ARCH_9XExx) {
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+ puts("eflash: not an AT91SAM9XE\n");
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+ return 0;
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+ }
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+
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+ /* now query the eflash for its structure */
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_GETD, &eefc->fcr);
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+ while ((readl(&eefc->fsr) & AT91_EEFC_FSR_FRDY) == 0)
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+ ;
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+ id = readl(&eefc->frr); /* word 0 */
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+ size = readl(&eefc->frr); /* word 1 */
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+ pagesize = readl(&eefc->frr); /* word 2 */
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+ nplanes = readl(&eefc->frr); /* word 3 */
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+ planesize = readl(&eefc->frr); /* word 4 */
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+ debug("id=%08x size=%u pagesize=%u planes=%u planesize=%u\n",
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+ id, size, pagesize, nplanes, planesize);
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+ for (i=1; i<nplanes; i++) {
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+ tmp = readl(&eefc->frr); /* words 5..4+nplanes-1 */
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+ };
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+ nlocks = readl(&eefc->frr); /* word 4+nplanes */
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+ debug("nlocks=%u\n", nlocks);
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+ /* since we are going to use the lock regions as sectors, check count */
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+ if (nlocks > CONFIG_SYS_MAX_FLASH_SECT) {
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+ printf("eflash: number of lock regions(%u) "\
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+ "> CONFIG_SYS_MAX_FLASH_SECT. reducing...\n",
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+ nlocks);
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+ nlocks = CONFIG_SYS_MAX_FLASH_SECT;
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+ }
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+ flash_info[0].size = size;
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+ flash_info[0].sector_count = nlocks;
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+ flash_info[0].flash_id = id;
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+
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+ addr = AT91SAM9XE_FLASH_BASE;
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+ for (i=0; i<nlocks; i++) {
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+ tmp = readl(&eefc->frr); /* words 4+nplanes+1.. */
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+ flash_info[0].start[i] = addr;
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+ flash_info[0].protect[i] = 0;
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+ addr += tmp;
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+ };
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+
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+ /* now read the protection information for all regions */
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_GLB, &eefc->fcr);
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+ while ((readl(&eefc->fsr) & AT91_EEFC_FSR_FRDY) == 0)
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+ ;
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+ for (i=0; i<flash_info[0].sector_count; i++) {
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+ if (i%32 == 0)
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+ tmp = readl(&eefc->frr);
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+ flash_info[0].protect[i] = (tmp >> (i%32)) & 1;
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+#if defined(CONFIG_EFLASH_PROTSECTORS)
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+ if (i < CONFIG_EFLASH_PROTSECTORS)
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+ flash_info[0].protect[i] = 1;
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+#endif
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+ }
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+
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+ return size;
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+}
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+
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+void flash_print_info (flash_info_t *info)
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+{
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+ int i;
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+
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+ puts("AT91SAM9XE embedded flash\n Size: ");
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+ print_size(info->size, " in ");
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+ printf("%d Sectors\n", info->sector_count);
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+
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+ printf(" Sector Start Addresses:");
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+ for (i=0; i<info->sector_count; ++i) {
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+ if ((i % 5) == 0)
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+ printf("\n ");
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+ printf(" %08lX%s",
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+ info->start[i],
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+ info->protect[i] ? " (RO)" : " "
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+ );
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+ }
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+ printf ("\n");
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+ return;
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+}
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+
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+int flash_real_protect (flash_info_t *info, long sector, int prot)
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+{
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+ at91_eefc_t *eefc = (at91_eefc_t *) 0xfffffa00;
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+ u32 pagenum = (info->start[sector]-AT91SAM9XE_FLASH_BASE)/pagesize;
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+ u32 i, tmp=0;
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+
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+ debug("protect sector=%ld prot=%d\n", sector, prot);
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+
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+#if defined(CONFIG_EFLASH_PROTSECTORS)
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+ if (sector < CONFIG_EFLASH_PROTSECTORS) {
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+ if (!prot) {
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+ printf("eflash: sector %lu cannot be unprotected\n",
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+ sector);
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+ }
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+ return 1; /* return anyway, caller does not care for result */
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+ }
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+#endif
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+ if (prot) {
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_SLB |
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+ (pagenum << AT91_EEFC_FCR_FARG_SHIFT), &eefc->fcr);
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+ } else {
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_CLB |
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+ (pagenum << AT91_EEFC_FCR_FARG_SHIFT), &eefc->fcr);
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+ }
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+ while ((readl(&eefc->fsr) & AT91_EEFC_FSR_FRDY) == 0)
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+ ;
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+ /* now re-read the protection information for all regions */
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_GLB, &eefc->fcr);
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+ while ((readl(&eefc->fsr) & AT91_EEFC_FSR_FRDY) == 0)
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+ ;
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+ for (i=0; i<info->sector_count; i++) {
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+ if (i%32 == 0)
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+ tmp = readl(&eefc->frr);
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+ info->protect[i] = (tmp >> (i%32)) & 1;
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+ }
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+ return 0;
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+}
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+
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+static u32 erase_write_page (u32 pagenum)
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+{
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+ at91_eefc_t *eefc = (at91_eefc_t *) 0xfffffa00;
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+
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+ debug("erase+write page=%u\n", pagenum);
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+
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+ /* give erase and write page command */
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+ writel(AT91_EEFC_FCR_KEY | AT91_EEFC_FCR_FCMD_EWP |
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+ (pagenum << AT91_EEFC_FCR_FARG_SHIFT), &eefc->fcr);
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+ while ((readl(&eefc->fsr) & AT91_EEFC_FSR_FRDY) == 0)
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+ ;
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+ /* return status */
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+ return readl(&eefc->fsr)
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+ & (AT91_EEFC_FSR_FCMDE | AT91_EEFC_FSR_FLOCKE);
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+}
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+
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+int flash_erase (flash_info_t *info, int s_first, int s_last)
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+{
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+ debug("erase first=%d last=%d\n", s_first, s_last);
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+ puts("this flash does not need and support erasing!\n");
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+ return 0;
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+}
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+
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+/*
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+ * Copy memory to flash, returns:
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+ * 0 - OK
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+ * 1 - write timeout
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+ */
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+
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+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
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+{
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+ u32 pagenum;
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+ u32 *src32, *dst32;
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+ u32 i;
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+
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+ debug("write src=%08lx addr=%08lx cnt=%lx\n",
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+ (ulong)src, addr, cnt);
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+
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+ /* REQUIRE addr to be on a page start, abort if not */
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+ if (addr % pagesize) {
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+ printf ("eflash: start %08lx is not on page start\n"\
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+ " write aborted\n", addr);
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+ return 1;
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+ }
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+
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+ /* now start copying data */
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+ pagenum = (addr-AT91SAM9XE_FLASH_BASE)/pagesize;
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+ src32 = (u32 *) src;
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+ dst32 = (u32 *) addr;
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+ while (cnt > 0) {
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+ i = pagesize / 4;
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+ /* fill page buffer */
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+ while (i--)
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+ *dst32++ = *src32++;
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+ /* write page */
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+ if (erase_write_page(pagenum))
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+ return 1;
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+ pagenum++;
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+ if (cnt > pagesize)
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+ cnt -= pagesize;
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+ else
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+ cnt = 0;
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+ }
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+ return 0;
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+}
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+
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Reinhard Meyer