diff options
Diffstat (limited to 'common/cmd_eeprom.c')
| -rw-r--r-- | common/cmd_eeprom.c | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/common/cmd_eeprom.c b/common/cmd_eeprom.c deleted file mode 100644 index 571240a..0000000 --- a/common/cmd_eeprom.c +++ /dev/null @@ -1,265 +0,0 @@ -/* - * (C) Copyright 2000, 2001 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -/* - * Support for read and write access to EEPROM like memory devices. This - * includes regular EEPROM as well as FRAM (ferroelectic nonvolaile RAM). - * FRAM devices read and write data at bus speed. In particular, there is no - * write delay. Also, there is no limit imposed on the number of bytes that can - * be transferred with a single read or write. - * - * Use the following configuration options to ensure no unneeded performance - * degradation (typical for EEPROM) is incured for FRAM memory: - * - * #define CONFIG_SYS_I2C_FRAM - * #undef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS - * - */ - -#include <common.h> -#include <config.h> -#include <command.h> -#include <i2c.h> - -#ifndef CONFIG_SYS_I2C_SPEED -#define CONFIG_SYS_I2C_SPEED 50000 -#endif - -#ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS -#define CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS 0 -#endif - -#ifndef CONFIG_SYS_EEPROM_PAGE_WRITE_BITS -#define CONFIG_SYS_EEPROM_PAGE_WRITE_BITS 8 -#endif - -#define EEPROM_PAGE_SIZE (1 << CONFIG_SYS_EEPROM_PAGE_WRITE_BITS) -#define EEPROM_PAGE_OFFSET(x) ((x) & (EEPROM_PAGE_SIZE - 1)) - -/* - * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 2 (16-bit EEPROM address) offset is - * 0x000nxxxx for EEPROM address selectors at n, offset xxxx in EEPROM. - * - * for CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 (8-bit EEPROM page address) offset is - * 0x00000nxx for EEPROM address selectors and page number at n. - */ -#if !defined(CONFIG_SPI) || defined(CONFIG_ENV_EEPROM_IS_ON_I2C) -#if !defined(CONFIG_SYS_I2C_EEPROM_ADDR_LEN) || \ - (CONFIG_SYS_I2C_EEPROM_ADDR_LEN < 1) || \ - (CONFIG_SYS_I2C_EEPROM_ADDR_LEN > 2) -#error CONFIG_SYS_I2C_EEPROM_ADDR_LEN must be 1 or 2 -#endif -#endif - -__weak int eeprom_write_enable(unsigned dev_addr, int state) -{ - return 0; -} - -void eeprom_init(int bus) -{ - /* SPI EEPROM */ -#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C) - spi_init_f(); -#endif - - /* I2C EEPROM */ -#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SYS_I2C_SOFT) -#if defined(CONFIG_SYS_I2C) - if (bus >= 0) - i2c_set_bus_num(bus); -#endif - i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); -#endif -} - -static int eeprom_addr(unsigned dev_addr, unsigned offset, uchar *addr) -{ - unsigned blk_off; - int alen; - - blk_off = offset & 0xff; /* block offset */ -#if CONFIG_SYS_I2C_EEPROM_ADDR_LEN == 1 - addr[0] = offset >> 8; /* block number */ - addr[1] = blk_off; /* block offset */ - alen = 2; -#else - addr[0] = offset >> 16; /* block number */ - addr[1] = offset >> 8; /* upper address octet */ - addr[2] = blk_off; /* lower address octet */ - alen = 3; -#endif /* CONFIG_SYS_I2C_EEPROM_ADDR_LEN */ - - addr[0] |= dev_addr; /* insert device address */ - - return alen; -} - -static int eeprom_len(unsigned offset, unsigned end) -{ - unsigned len = end - offset; - - /* - * For a FRAM device there is no limit on the number of the - * bytes that can be ccessed with the single read or write - * operation. - */ -#if !defined(CONFIG_SYS_I2C_FRAM) - unsigned blk_off = offset & 0xff; - unsigned maxlen = EEPROM_PAGE_SIZE - EEPROM_PAGE_OFFSET(blk_off); - - if (maxlen > I2C_RXTX_LEN) - maxlen = I2C_RXTX_LEN; - - if (len > maxlen) - len = maxlen; -#endif - - return len; -} - -static int eeprom_rw_block(unsigned offset, uchar *addr, unsigned alen, - uchar *buffer, unsigned len, bool read) -{ - int ret = 0; - - /* SPI */ -#if defined(CONFIG_SPI) && !defined(CONFIG_ENV_EEPROM_IS_ON_I2C) - if (read) - spi_read(addr, alen, buffer, len); - else - spi_write(addr, alen, buffer, len); -#else /* I2C */ - -#if defined(CONFIG_SYS_I2C_EEPROM_BUS) - i2c_set_bus_num(CONFIG_SYS_I2C_EEPROM_BUS); -#endif - - if (read) - ret = i2c_read(addr[0], offset, alen - 1, buffer, len); - else - ret = i2c_write(addr[0], offset, alen - 1, buffer, len); - - if (ret) - ret = 1; -#endif - return ret; -} - -static int eeprom_rw(unsigned dev_addr, unsigned offset, uchar *buffer, - unsigned cnt, bool read) -{ - unsigned end = offset + cnt; - unsigned alen, len; - int rcode = 0; - uchar addr[3]; - - while (offset < end) { - alen = eeprom_addr(dev_addr, offset, addr); - - len = eeprom_len(offset, end); - - rcode = eeprom_rw_block(offset, addr, alen, buffer, len, read); - - buffer += len; - offset += len; - - if (!read) - udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000); - } - - return rcode; -} - -int eeprom_read(unsigned dev_addr, unsigned offset, uchar *buffer, unsigned cnt) -{ - /* - * Read data until done or would cross a page boundary. - * We must write the address again when changing pages - * because the next page may be in a different device. - */ - return eeprom_rw(dev_addr, offset, buffer, cnt, 1); -} - -int eeprom_write(unsigned dev_addr, unsigned offset, - uchar *buffer, unsigned cnt) -{ - int ret; - - eeprom_write_enable(dev_addr, 1); - - /* - * Write data until done or would cross a write page boundary. - * We must write the address again when changing pages - * because the address counter only increments within a page. - */ - ret = eeprom_rw(dev_addr, offset, buffer, cnt, 0); - - eeprom_write_enable(dev_addr, 0); - return ret; -} - -static int do_eeprom(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) -{ - const char *const fmt = - "\nEEPROM @0x%lX %s: addr %08lx off %04lx count %ld ... "; - char * const *args = &argv[2]; - int rcode; - ulong dev_addr, addr, off, cnt; - int bus_addr; - - switch (argc) { -#ifdef CONFIG_SYS_DEF_EEPROM_ADDR - case 5: - bus_addr = -1; - dev_addr = CONFIG_SYS_DEF_EEPROM_ADDR; - break; -#endif - case 6: - bus_addr = -1; - dev_addr = simple_strtoul(*args++, NULL, 16); - break; - case 7: - bus_addr = simple_strtoul(*args++, NULL, 16); - dev_addr = simple_strtoul(*args++, NULL, 16); - break; - default: - return CMD_RET_USAGE; - } - - addr = simple_strtoul(*args++, NULL, 16); - off = simple_strtoul(*args++, NULL, 16); - cnt = simple_strtoul(*args++, NULL, 16); - - eeprom_init(bus_addr); - - if (strcmp(argv[1], "read") == 0) { - printf(fmt, dev_addr, argv[1], addr, off, cnt); - - rcode = eeprom_read(dev_addr, off, (uchar *)addr, cnt); - - puts("done\n"); - return rcode; - } else if (strcmp(argv[1], "write") == 0) { - printf(fmt, dev_addr, argv[1], addr, off, cnt); - - rcode = eeprom_write(dev_addr, off, (uchar *)addr, cnt); - - puts("done\n"); - return rcode; - } - - return CMD_RET_USAGE; -} - -U_BOOT_CMD( - eeprom, 7, 1, do_eeprom, - "EEPROM sub-system", - "read <bus> <devaddr> addr off cnt\n" - "eeprom write <bus> <devaddr> addr off cnt\n" - " - read/write `cnt' bytes from `devaddr` EEPROM at offset `off'" -) |