From: Cristian Birsan cristi.birsan@microchip.com
Signed-off-by: Cristian Birsan cristi.birsan@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com ---
arch/mips/mach-pic32/Makefile | 5 +- arch/mips/mach-pic32/flash.c | 471 ++++++++++++++++++++++++++++++++++++++++++ include/flash.h | 5 +- 3 files changed, 479 insertions(+), 2 deletions(-) create mode 100644 arch/mips/mach-pic32/flash.c
diff --git a/arch/mips/mach-pic32/Makefile b/arch/mips/mach-pic32/Makefile index 03d5f27..3a621c3 100644 --- a/arch/mips/mach-pic32/Makefile +++ b/arch/mips/mach-pic32/Makefile @@ -4,4 +4,7 @@ # SPDX-License-Identifier: GPL-2.0+ #
-obj-y = cpu.o reset.o lowlevel_init.o \ No newline at end of file +obj-y = cpu.o reset.o lowlevel_init.o +ifndef CONFIG_SYS_NO_FLASH +obj-y += flash.o +endif \ No newline at end of file diff --git a/arch/mips/mach-pic32/flash.c b/arch/mips/mach-pic32/flash.c new file mode 100644 index 0000000..b3c1e0a --- /dev/null +++ b/arch/mips/mach-pic32/flash.c @@ -0,0 +1,471 @@ +/* + * Copyright (C) 2015 + * Cristian Birsan cristian.birsan@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + */ + +#include <common.h> +#include <flash.h> +#include <asm/io.h> +#include <linux/byteorder/swab.h> +#include <asm/arch-pic32/pic32.h> + +#if defined(CONFIG_ENV_IS_IN_FLASH) +#ifndef CONFIG_ENV_ADDR +#define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET) +#endif + +#ifndef CONFIG_ENV_SIZE +#define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE +#endif + +#ifndef CONFIG_ENV_SECT_SIZE +#define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE +#endif +#endif + +/* NVM Controller registers */ +#define NVMCON (PIC32_NVM_BASE + 0x00) +#define NVMCONCLR (NVMCON + _CLR_OFFSET) +#define NVMCONSET (NVMCON + _SET_OFFSET) +#define NVMKEY (PIC32_NVM_BASE + 0x10) +#define NVMADDR (PIC32_NVM_BASE + 0x20) +#define NVMDATA0 (PIC32_NVM_BASE + 0x30) + +/* NVM Operations */ +#define NVMOP_NOP 0x00000000 +#define NVMOP_WORD_WRITE 0x00000001 +#define NVMOP_PAGE_ERASE 0x00000004 + +/* NVM Programming Control Register*/ +#define NVMCON_WREN 0x00004000 +#define NVMCON_WR 0x00008000 +#define NVMCON_WRERR 0x00002000 +#define NVMCON_LVDERR 0x00001000 + +/*----------------------------------------------------------------------- + */ +flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; + +/* + * The following code cannot be run from FLASH! + */ +static ulong flash_get_size(vu_long *addr, flash_info_t *info) +{ + short i; + ulong base = (ulong)addr; + ulong sector_offset; + + /* On chip flash ID */ + switch (info->flash_id & FLASH_VENDMASK) { + case FLASH_MAN_MCHP: + break; + default: + /* no or unknown flash */ + printf("unknown manufacturer: 0x%lx\n", + info->flash_id & FLASH_VENDMASK); + info->flash_id = FLASH_UNKNOWN; + info->sector_count = 0; + info->size = 0; + return 0; + } + + switch (info->flash_id & FLASH_TYPEMASK) { + case FLASH_MCHP100T: + info->sector_count = CONFIG_SYS_MAX_FLASH_SECT; + info->size = CONFIG_SYS_FLASH_SIZE; + sector_offset = info->size / info->sector_count; + break; + default: + info->flash_id = FLASH_UNKNOWN; + return 0; /* => no or unknown flash */ + } + + /* set up sector start address table */ + for (i = 0; i < info->sector_count; i++) { + info->start[i] = base; + base += sector_offset; + /* protect each sector by default */ + info->protect[i] = 1; + } + + /* Disable Flash Write/Erase operations */ + writel(NVMCON_WREN, NVMCONCLR); + + if (info->flash_id != FLASH_UNKNOWN) + addr = (vu_long *)info->start[0]; + + return info->size; +} + +/*----------------------------------------------------------------------- + */ +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 "); + 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"); +} + +static inline void flash_initiate_operation(void) +{ + /* Unlock sequence */ + writel(0x00000000, NVMKEY); + writel(0xAA996655, NVMKEY); + writel(0x556699AA, NVMKEY); + + writel(NVMCON_WR, NVMCON); +} + +static inline void flash_nop_operation(void) +{ + /* reset error bits using a flash NOP command */ + + writel(NVMOP_NOP, NVMCON); /* NVMOP for page erase*/ + writel(NVMCON_WREN, NVMCONSET); /* Enable Flash Write*/ + flash_initiate_operation(); +} + +int flash_erase(flash_info_t *info, int s_first, int s_last) +{ + int flag, prot, sect; + ulong base, elapsed, last = 0, tmp, addr; + + 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"); + + base = get_timer(0); + + /* Start erase on unprotected sectors */ + for (sect = s_first; sect <= s_last; sect++) { + if (info->protect[sect]) /* skip protected sector */ + continue; + + /* Disable interrupts which might cause timeout */ + flag = disable_interrupts(); + + /* destination page physical address */ + addr = virt_to_phys((void *)info->start[sect]); + writel(addr, NVMADDR); + + /* NVMOP for page erase*/ + writel(NVMOP_PAGE_ERASE, NVMCON); + /* Enable Flash Write*/ + writel(NVMCON_WREN, NVMCONSET); + + /* Initiate operation */ + flash_initiate_operation(); + + /* Wait for WR bit to clear */ + while (readl(NVMCON) & NVMCON_WR) { + elapsed = get_timer(base); + if (elapsed > CONFIG_SYS_FLASH_ERASE_TOUT) { + printf("Timeout\n"); + /* reset bank */ + return ERR_TIMOUT; + } + + /* show that we're waiting */ + if ((elapsed - last) > 100) { /* every 100msec */ + putc('.'); + last = elapsed; + } + } + + tmp = readl(NVMCON); + if (tmp & NVMCON_WRERR) { + printf("Error in Block Erase - Lock Bit may be set!\n"); + flash_nop_operation(); + return ERR_PROTECTED; + } + + if (tmp & NVMCON_LVDERR) { + printf("Error in Block Erase - low-vol detected!\n"); + flash_nop_operation(); + return ERR_NOT_ERASED; + } + + /* Disable future Flash Write/Erase operations */ + writel(NVMCON_WREN, NVMCONCLR); + + /* re-enable interrupts if necessary */ + if (flag) + enable_interrupts(); + } + + for (sect = s_first; sect <= s_last; sect++) { + addr = info->start[sect]; + tmp = addr + (info->size / info->sector_count); + invalidate_dcache_range(addr, tmp); + } + + printf(" done\n"); + return ERR_OK; +} + +int page_erase(flash_info_t *info, int sect) +{ + return 0; +} + +/*----------------------------------------------------------------------- + * Write a word to Flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ +static int write_word(flash_info_t *info, ulong dest, ulong data) +{ + vu_long *addr = (vu_long *)dest; + ulong base, elapsed, last = 0, tmp; + int rc; + + /* Check if Flash is (sufficiently) erased */ + if ((*addr & data) != data) { + printf("Error, Flash not erased!\n"); + return ERR_NOT_ERASED; + } + + base = get_timer(0); + + /* Disable interrupts which might cause a timeout here */ + rc = disable_interrupts(); + + /* destination page physical address*/ + writel(virt_to_phys(addr), NVMADDR); + writel(data, NVMDATA0); + + /* NVMOP for word write*/ + writel(NVMOP_WORD_WRITE, NVMCON); + + /* Enable Flash Write*/ + writel(NVMCON_WREN, NVMCONSET); + + /* Initiate operation */ + flash_initiate_operation(); + + /* re-enable interrupts if necessary */ + if (rc) + enable_interrupts(); + + /* Wait for WR bit to clear */ + while (readl(NVMCON) & NVMCON_WR) { + elapsed = get_timer(base); + if (elapsed > CONFIG_SYS_FLASH_WRITE_TOUT) { + printf("Timeout\n"); + /* reset bank */ + return ERR_TIMOUT; + } + + /* show that we're waiting */ + if ((elapsed - last) > 10) { /* every 10msec */ + putc('.'); + last = elapsed; + } + } + + rc = 0; + tmp = readl(NVMCON); + if (tmp & NVMCON_WRERR) { + printf("Error in Block Write - Flash may be locked !\n"); + flash_nop_operation(); + rc |= ERR_PROG_ERROR; + } + + if (tmp & NVMCON_LVDERR) { + printf("Error in Block Write - Brown out Reset detected!\n"); + flash_nop_operation(); + rc |= ERR_ABORTED; + } + + /* Disable future Flash Write/Erase operations */ + writel(NVMCON_WREN, NVMCONCLR); + + return rc; +} + +/*----------------------------------------------------------------------- + * Copy memory to flash, returns: + * 0 - OK + * 1 - write timeout + * 2 - Flash not erased + */ + +int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt) +{ + ulong cp, wp, data, n = cnt; + int i, l, rc; + + wp = (addr & ~3); /* get lower word aligned address */ + + /* + * handle unaligned start bytes + */ + l = addr - wp; + if (l != 0) { + data = 0; + for (i = 0, cp = wp; i < l; ++i, ++cp) + data = (data << 8) | (*(uchar *)cp); + + for (; (i < 4) && (cnt > 0); ++i) { + data = (data << 8) | *src++; + --cnt; + ++cp; + } + + for (; (cnt == 0) && (i < 4); ++i, ++cp) + data = (data << 8) | (*(uchar *)cp); + + rc = write_word(info, wp, __swab32(data)); + if (rc) + goto out; + + wp += 4; + } + + /* + * handle word aligned part + */ + while (cnt >= 4) { + data = 0; + for (i = 0; i < 4; ++i) + data = (data << 8) | *src++; + + rc = write_word(info, wp, __swab32(data)); + if (rc) + goto out; + + wp += 4; + cnt -= 4; + } + + if (cnt == 0) { + rc = ERR_OK; + goto out; + } + + /* + * handle unaligned tail bytes + */ + data = 0; + for (i = 0, cp = wp; (i < 4) && (cnt > 0); ++i, ++cp) { + data = (data << 8) | *src++; + --cnt; + } + + for (; i < 4; ++i, ++cp) + data = (data << 8) | (*(uchar *)cp); + + rc = write_word(info, wp, __swab32(data)); + +out: + invalidate_dcache_range(addr, addr + n); + return rc; +} + +unsigned long flash_init(void) +{ + unsigned long size; + vu_long *addr; + int i; + + /* Init: enable write, + * or we cannot even write flash commands + */ + + for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) + flash_info[i].flash_id = FLASH_UNKNOWN; + + /* flash info: combined device & manufacturer code */ + flash_info[0].flash_id = FLASH_MAN_MCHP | FLASH_MCHP100T; + flash_info[1].flash_id = FLASH_MAN_MCHP | FLASH_MCHP100T; + + /* Static FLASH Bank configuration here */ + addr = (vu_long *)phys_to_virt(PHYS_FLASH_1); + flash_info[0].size = flash_get_size(addr, &flash_info[0]); + size = flash_info[0].size; + + addr = (vu_long *)phys_to_virt(PHYS_FLASH_2); + flash_info[1].size = flash_get_size(addr, &flash_info[1]); + size += flash_info[1].size; + + for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) { + if (flash_info[i].flash_id == FLASH_UNKNOWN) { + printf("## Unknown FLASH on Bank 0 - Size = 0x%08lx\n", + size); + } + } + +#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 size; +} diff --git a/include/flash.h b/include/flash.h index f53ace7..c9aacd5 100644 --- a/include/flash.h +++ b/include/flash.h @@ -400,6 +400,9 @@ extern flash_info_t *flash_get_info(ulong base); #define FLASH_STM800DT 0x00D7 /* STM M29W800DT (1M = 64K x 16, top) */ #define FLASH_STM800DB 0x005B /* STM M29W800DB (1M = 64K x 16, bottom)*/
+#define FLASH_MCHP100T 0x0060 /* MCHP internal (1M = 64K x 16) */ +#define FLASH_MCHP100B 0x0061 /* MCHP internal (1M = 64K x 16) */ + #define FLASH_28F400_T 0x0062 /* MT 28F400B3 ID ( 4M = 256K x 16 ) */ #define FLASH_28F400_B 0x0063 /* MT 28F400B3 ID ( 4M = 256K x 16 ) */
@@ -486,7 +489,7 @@ extern flash_info_t *flash_get_info(ulong base); #define FLASH_MAN_SHARP 0x00500000 #define FLASH_MAN_ATM 0x00600000 #define FLASH_MAN_CFI 0x01000000 - +#define FLASH_MAN_MCHP 0x02000000 /* Microchip Technology */
#define FLASH_TYPEMASK 0x0000FFFF /* extract FLASH type information */ #define FLASH_VENDMASK 0xFFFF0000 /* extract FLASH vendor information */