+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * Copyright (C) 2015
- * Cristian Birsan <cristian.birsan@microchip.com>
- * Purna Chandra Mandal <purna.mandal@microchip.com>
- */
-
-#include <common.h>
-#include <cpu_func.h>
-#include <dm.h>
-#include <fdt_support.h>
-#include <flash.h>
-#include <init.h>
-#include <irq_func.h>
-#include <asm/global_data.h>
-#include <linux/bitops.h>
-#include <mach/pic32.h>
-#include <wait_bit.h>
-
-DECLARE_GLOBAL_DATA_PTR;
-
-/* NVM Controller registers */
-struct pic32_reg_nvm {
- struct pic32_reg_atomic ctrl;
- struct pic32_reg_atomic key;
- struct pic32_reg_atomic addr;
- struct pic32_reg_atomic data;
-};
-
-/* NVM operations */
-#define NVMOP_NOP 0
-#define NVMOP_WORD_WRITE 1
-#define NVMOP_PAGE_ERASE 4
-
-/* NVM control bits */
-#define NVM_WR BIT(15)
-#define NVM_WREN BIT(14)
-#define NVM_WRERR BIT(13)
-#define NVM_LVDERR BIT(12)
-
-/* NVM programming unlock register */
-#define LOCK_KEY 0x0
-#define UNLOCK_KEY1 0xaa996655
-#define UNLOCK_KEY2 0x556699aa
-
-/*
- * PIC32 flash banks consist of number of pages, each page
- * into number of rows and rows into number of words.
- * Here we will maintain page information instead of sector.
- */
-flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
-static struct pic32_reg_nvm *nvm_regs_p;
-
-static inline void flash_initiate_operation(u32 nvmop)
-{
- /* set operation */
- writel(nvmop, &nvm_regs_p->ctrl.raw);
-
- /* enable flash write */
- writel(NVM_WREN, &nvm_regs_p->ctrl.set);
-
- /* unlock sequence */
- writel(LOCK_KEY, &nvm_regs_p->key.raw);
- writel(UNLOCK_KEY1, &nvm_regs_p->key.raw);
- writel(UNLOCK_KEY2, &nvm_regs_p->key.raw);
-
- /* initiate operation */
- writel(NVM_WR, &nvm_regs_p->ctrl.set);
-}
-
-static int flash_wait_till_busy(const char *func, ulong timeout)
-{
- int ret = wait_for_bit_le32(&nvm_regs_p->ctrl.raw,
- NVM_WR, false, timeout, false);
-
- return ret ? ERR_TIMEOUT : ERR_OK;
-}
-
-static inline int flash_complete_operation(void)
-{
- u32 tmp;
-
- tmp = readl(&nvm_regs_p->ctrl.raw);
- if (tmp & NVM_WRERR) {
- printf("Error in Block Erase - Lock Bit may be set!\n");
- flash_initiate_operation(NVMOP_NOP);
- return ERR_PROTECTED;
- }
-
- if (tmp & NVM_LVDERR) {
- printf("Error in Block Erase - low-vol detected!\n");
- flash_initiate_operation(NVMOP_NOP);
- return ERR_NOT_ERASED;
- }
-
- /* disable flash write or erase operation */
- writel(NVM_WREN, &nvm_regs_p->ctrl.clr);
-
- return ERR_OK;
-}
-
-/*
- * Erase flash sectors, returns:
- * ERR_OK - OK
- * ERR_INVAL - invalid sector arguments
- * ERR_TIMEOUT - write timeout
- * ERR_NOT_ERASED - Flash not erased
- * ERR_UNKNOWN_FLASH_VENDOR - incorrect flash
- */
-int flash_erase(flash_info_t *info, int s_first, int s_last)
-{
- ulong sect_start, sect_end, flags;
- int prot, sect;
- int rc;
-
- if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_MCHP) {
- printf("Can't erase unknown flash type %08lx - aborted\n",
- info->flash_id);
- return ERR_UNKNOWN_FLASH_VENDOR;
- }
-
- if ((s_first < 0) || (s_first > s_last)) {
- printf("- no sectors to erase\n");
- return ERR_INVAL;
- }
-
- 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");
-
- /* erase on unprotected sectors */
- for (sect = s_first; sect <= s_last; sect++) {
- if (info->protect[sect])
- continue;
-
- /* disable interrupts */
- flags = disable_interrupts();
-
- /* write destination page address (physical) */
- sect_start = CPHYSADDR(info->start[sect]);
- writel(sect_start, &nvm_regs_p->addr.raw);
-
- /* page erase */
- flash_initiate_operation(NVMOP_PAGE_ERASE);
-
- /* wait */
- rc = flash_wait_till_busy(__func__,
- CONFIG_SYS_FLASH_ERASE_TOUT);
-
- /* re-enable interrupts if necessary */
- if (flags)
- enable_interrupts();
-
- if (rc != ERR_OK)
- return rc;
-
- rc = flash_complete_operation();
- if (rc != ERR_OK)
- return rc;
-
- /*
- * flash content is updated but cache might contain stale
- * data, so invalidate dcache.
- */
- sect_end = info->start[sect] + info->size / info->sector_count;
- invalidate_dcache_range(info->start[sect], sect_end);
- }
-
- printf(" done\n");
- return ERR_OK;
-}
-
-int page_erase(flash_info_t *info, int sect)
-{
- return 0;
-}
-
-/* Write a word to flash */
-static int write_word(flash_info_t *info, ulong dest, ulong word)
-{
- ulong flags;
- int rc;
-
- /* read flash to check if it is sufficiently erased */
- if ((readl((void __iomem *)dest) & word) != word) {
- printf("Error, Flash not erased!\n");
- return ERR_NOT_ERASED;
- }
-
- /* disable interrupts */
- flags = disable_interrupts();
-
- /* update destination page address (physical) */
- writel(CPHYSADDR(dest), &nvm_regs_p->addr.raw);
- writel(word, &nvm_regs_p->data.raw);
-
- /* word write */
- flash_initiate_operation(NVMOP_WORD_WRITE);
-
- /* wait for operation to complete */
- rc = flash_wait_till_busy(__func__, CONFIG_SYS_FLASH_WRITE_TOUT);
-
- /* re-enable interrupts if necessary */
- if (flags)
- enable_interrupts();
-
- if (rc != ERR_OK)
- return rc;
-
- return flash_complete_operation();
-}
-
-/*
- * Copy memory to flash, returns:
- * ERR_OK - OK
- * ERR_TIMEOUT - write timeout
- * ERR_NOT_ERASED - Flash not erased
- */
-int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
-{
- ulong dst, tmp_le, len = cnt;
- int i, l, rc;
- uchar *cp;
-
- /* get lower word aligned address */
- dst = (addr & ~3);
-
- /* handle unaligned start bytes */
- l = addr - dst;
- if (l != 0) {
- tmp_le = 0;
- for (i = 0, cp = (uchar *)dst; i < l; ++i, ++cp)
- tmp_le |= *cp << (i * 8);
-
- for (; (i < 4) && (cnt > 0); ++i, ++src, --cnt, ++cp)
- tmp_le |= *src << (i * 8);
-
- for (; (cnt == 0) && (i < 4); ++i, ++cp)
- tmp_le |= *cp << (i * 8);
-
- rc = write_word(info, dst, tmp_le);
- if (rc)
- goto out;
-
- dst += 4;
- }
-
- /* handle word aligned part */
- while (cnt >= 4) {
- tmp_le = src[0] | src[1] << 8 | src[2] << 16 | src[3] << 24;
- rc = write_word(info, dst, tmp_le);
- if (rc)
- goto out;
- src += 4;
- dst += 4;
- cnt -= 4;
- }
-
- if (cnt == 0) {
- rc = ERR_OK;
- goto out;
- }
-
- /* handle unaligned tail bytes */
- tmp_le = 0;
- for (i = 0, cp = (uchar *)dst; (i < 4) && (cnt > 0); ++i, ++cp) {
- tmp_le |= *src++ << (i * 8);
- --cnt;
- }
-
- for (; i < 4; ++i, ++cp)
- tmp_le |= *cp << (i * 8);
-
- rc = write_word(info, dst, tmp_le);
-out:
- /*
- * flash content updated by nvm controller but CPU cache might
- * have stale data, so invalidate dcache.
- */
- invalidate_dcache_range(addr, addr + len);
-
- printf(" done\n");
- return rc;
-}
-
-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_MCHP:
- printf("Microchip Technology ");
- break;
- default:
- printf("Unknown Vendor ");
- break;
- }
-
- switch (info->flash_id & FLASH_TYPEMASK) {
- case FLASH_MCHP100T:
- printf("Internal (8 Mbit, 64 x 16k)\n");
- break;
- default:
- printf("Unknown Chip Type\n");
- 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");
-}
-
-unsigned long flash_init(void)
-{
- unsigned long size = 0;
- struct udevice *dev;
- int bank;
-
- /* probe every MTD device */
- for (uclass_first_device(UCLASS_MTD, &dev); dev;
- uclass_next_device(&dev)) {
- /* nop */
- }
-
- /* calc total flash size */
- for (bank = 0; bank < CONFIG_SYS_MAX_FLASH_BANKS; ++bank)
- size += flash_info[bank].size;
-
- return size;
-}
-
-static void pic32_flash_bank_init(flash_info_t *info,
- ulong base, ulong size)
-{
- ulong sect_size;
- int sect;
-
- /* device & manufacturer code */
- info->flash_id = FLASH_MAN_MCHP | FLASH_MCHP100T;
- info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
- info->size = size;
-
- /* update sector (i.e page) info */
- sect_size = info->size / info->sector_count;
- for (sect = 0; sect < info->sector_count; sect++) {
- info->start[sect] = base;
- /* protect each sector by default */
- info->protect[sect] = 1;
- base += sect_size;
- }
-}
-
-static int pic32_flash_probe(struct udevice *dev)
-{
- void *blob = (void *)gd->fdt_blob;
- int node = dev_of_offset(dev);
- const char *list, *end;
- const fdt32_t *cell;
- unsigned long addr, size;
- int parent, addrc, sizec;
- flash_info_t *info;
- int len, idx;
-
- /*
- * decode regs. there are multiple reg tuples, and they need to
- * match with reg-names.
- */
- parent = fdt_parent_offset(blob, node);
- fdt_support_default_count_cells(blob, parent, &addrc, &sizec);
- list = fdt_getprop(blob, node, "reg-names", &len);
- if (!list)
- return -ENOENT;
-
- end = list + len;
- cell = fdt_getprop(blob, node, "reg", &len);
- if (!cell)
- return -ENOENT;
-
- for (idx = 0, info = &flash_info[0]; list < end;) {
- addr = fdt_translate_address((void *)blob, node, cell + idx);
- size = fdt_addr_to_cpu(cell[idx + addrc]);
- len = strlen(list);
- if (!strncmp(list, "nvm", len)) {
- /* NVM controller */
- nvm_regs_p = ioremap(addr, size);
- } else if (!strncmp(list, "bank", 4)) {
- /* Flash bank: use kseg0 cached address */
- pic32_flash_bank_init(info, CKSEG0ADDR(addr), size);
- info++;
- }
- idx += addrc + sizec;
- list += len + 1;
- }
-
- /* disable flash write/erase operations */
- writel(NVM_WREN, &nvm_regs_p->ctrl.clr);
-
-#if (CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE)
- /* monitor protection ON by default */
- flash_protect(FLAG_PROTECT_SET,
- CONFIG_SYS_MONITOR_BASE,
- CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
- &flash_info[0]);
-#endif
-
-#ifdef CONFIG_ENV_IS_IN_FLASH
- /* ENV protection ON by default */
- flash_protect(FLAG_PROTECT_SET,
- CONFIG_ENV_ADDR,
- CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
- &flash_info[0]);
-#endif
- return 0;
-}
-
-static const struct udevice_id pic32_flash_ids[] = {
- { .compatible = "microchip,pic32mzda-flash" },
- {}
-};
-
-U_BOOT_DRIVER(pic32_flash) = {
- .name = "pic32_flash",
- .id = UCLASS_MTD,
- .of_match = pic32_flash_ids,
- .probe = pic32_flash_probe,
-};
projects / u-boot.git / commitdiff
