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https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
254 lines
7.0 KiB
C
254 lines
7.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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/*
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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 environment spans
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* whole pages!
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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/io.h>
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#include <asm/arch/hardware.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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/* 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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/* 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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unsigned long flash_init (void)
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{
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at91_eefc_t *eefc = (at91_eefc_t *) ATMEL_BASE_EEFC;
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at91_dbu_t *dbu = (at91_dbu_t *) ATMEL_BASE_DBGU;
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u32 id, size, nplanes, planesize, nlocks;
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u32 addr, i, tmp=0;
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debug("eflash: init\n");
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flash_info[0].flash_id = FLASH_UNKNOWN;
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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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/* 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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addr = ATMEL_BASE_FLASH;
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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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/* 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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return size;
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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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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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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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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 *) ATMEL_BASE_EEFC;
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u32 pagenum = (info->start[sector]-ATMEL_BASE_FLASH)/pagesize;
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u32 i, tmp=0;
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debug("protect sector=%ld prot=%d\n", sector, prot);
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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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static u32 erase_write_page (u32 pagenum)
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{
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at91_eefc_t *eefc = (at91_eefc_t *) ATMEL_BASE_EEFC;
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debug("erase+write page=%u\n", pagenum);
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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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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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* 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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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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debug("write src=%08lx addr=%08lx cnt=%lx\n",
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(ulong)src, addr, cnt);
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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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/* now start copying data */
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pagenum = (addr-ATMEL_BASE_FLASH)/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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