diff options
Diffstat (limited to 'chip/lm4/eeprom.c')
| -rw-r--r-- | chip/lm4/eeprom.c | 268 |
1 files changed, 0 insertions, 268 deletions
diff --git a/chip/lm4/eeprom.c b/chip/lm4/eeprom.c deleted file mode 100644 index 97fd3bdc24..0000000000 --- a/chip/lm4/eeprom.c +++ /dev/null @@ -1,268 +0,0 @@ -/* Copyright 2012 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* EEPROM module for Chrome EC */ - -#include "clock.h" -#include "console.h" -#include "eeprom.h" -#include "registers.h" -#include "timer.h" -#include "util.h" -#include "watchdog.h" - -/* Size of EEPROM block in bytes */ -#define EEPROM_BLOCK_SIZE 64 - -/* Count of EEPROM blocks */ -static int block_count; - -/* - * Wait for the current EEPROM operation to finish; all operations but write - * should normally finish in 4 system clocks, but worst case is up to - * 1800ms if the EEPROM needs to do an internal page erase/copy. We must - * spin-wait for this delay, because EEPROM operations will fail if the chip - * drops to sleep mode. - */ -static int wait_for_done(void) -{ - int j; - - for (j = 0; j < 20; j++) { /* 20 * 100 ms = 2000 ms */ - uint64_t tstop = get_time().val + 100 * MSEC; - while (get_time().val < tstop) { - if (!(LM4_EEPROM_EEDONE & 0x01)) - return EC_SUCCESS; - } - watchdog_reload(); - } - - return EC_ERROR_UNKNOWN; -} - - -int eeprom_get_block_count(void) -{ - return block_count; -} - - -int eeprom_get_block_size(void) -{ - return EEPROM_BLOCK_SIZE; -} - - -int eeprom_read(int block, int offset, int size, char *data) -{ - uint32_t *d = (uint32_t *)data; - int rv; - - if (block < 0 || block >= block_count || - offset < 0 || offset > EEPROM_BLOCK_SIZE || offset & 3 || - size < 0 || offset + size > EEPROM_BLOCK_SIZE || size & 3) - return EC_ERROR_UNKNOWN; - - rv = wait_for_done(); - if (rv) - return rv; - - LM4_EEPROM_EEBLOCK = block; - if (LM4_EEPROM_EEBLOCK != block) - return EC_ERROR_UNKNOWN; /* Error setting block */ - - LM4_EEPROM_EEOFFSET = offset >> 2; - - for (; size; size -= sizeof(uint32_t)) - *(d++) = LM4_EEPROM_EERDWRINC; - - return EC_SUCCESS; -} - - -int eeprom_write(int block, int offset, int size, const char *data) -{ - uint32_t *d = (uint32_t *)data; - int rv; - - if (block < 0 || block >= block_count || - offset < 0 || offset > EEPROM_BLOCK_SIZE || offset & 3 || - size < 0 || offset + size > EEPROM_BLOCK_SIZE || size & 3) - return EC_ERROR_UNKNOWN; - - rv = wait_for_done(); - if (rv) - return rv; - - LM4_EEPROM_EEBLOCK = block; - if (LM4_EEPROM_EEBLOCK != block) - return EC_ERROR_UNKNOWN; /* Error setting block */ - - LM4_EEPROM_EEOFFSET = offset >> 2; - - /* Write 32 bits at a time; wait for each write to complete */ - for (; size; size -= sizeof(uint32_t)) { - LM4_EEPROM_EERDWRINC = *(d++); - - rv = wait_for_done(); - if (rv) - return rv; - - if (LM4_EEPROM_EEDONE & 0x10) { - /* Failed due to write protect */ - return EC_ERROR_ACCESS_DENIED; - } else if (LM4_EEPROM_EEDONE & 0x100) { - /* Failed due to program voltage level */ - return EC_ERROR_UNKNOWN; - } - } - - return EC_SUCCESS; -} - - -int eeprom_hide(int block) -{ - /* Block 0 can't be hidden */ - if (block <= 0 || block >= block_count) - return EC_ERROR_UNKNOWN; - - LM4_EEPROM_EEHIDE |= 1 << block; - return EC_SUCCESS; -} - - -/*****************************************************************************/ -/* Console commands */ - -static int command_eeprom_info(int argc, char **argv) -{ - ccprintf("%d blocks @ %d bytes, hide=0x%08x\n", - eeprom_get_block_count(), eeprom_get_block_size(), - LM4_EEPROM_EEHIDE); - return EC_SUCCESS; -} -DECLARE_CONSOLE_COMMAND(eeinfo, command_eeprom_info, - NULL, - "Print EEPROM info"); - - -static int command_eeprom_read(int argc, char **argv) -{ - int block = 0; - int offset = 0; - char *e; - int rv; - uint32_t d; - - if (argc < 2) - return EC_ERROR_PARAM_COUNT; - - block = strtoi(argv[1], &e, 0); - if (*e) - return EC_ERROR_PARAM1; - - if (argc > 2) { - offset = strtoi(argv[2], &e, 0); - if (*e) - return EC_ERROR_PARAM2; - } - - rv = eeprom_read(block, offset, sizeof(d), (char *)&d); - if (rv == EC_SUCCESS) - ccprintf("%d:%d = 0x%08x\n", block, offset, d); - return rv; -} -DECLARE_CONSOLE_COMMAND(eeread, command_eeprom_read, - "block [offset]", - "Read a word of EEPROM"); - - -static int command_eeprom_write(int argc, char **argv) -{ - int block = 0; - int offset = 0; - char *e; - uint32_t d; - - if (argc < 4) - return EC_ERROR_PARAM_COUNT; - - block = strtoi(argv[1], &e, 0); - if (*e) - return EC_ERROR_PARAM1; - offset = strtoi(argv[2], &e, 0); - if (*e) - return EC_ERROR_PARAM2; - d = strtoi(argv[3], &e, 0); - if (*e) - return EC_ERROR_PARAM3; - - ccprintf("Writing 0x%08x to %d:%d...\n", d, block, offset); - return eeprom_write(block, offset, sizeof(d), (char *)&d); -} -DECLARE_CONSOLE_COMMAND(eewrite, command_eeprom_write, - "block offset value", - "Write a word of EEPROM"); - - -#ifdef CONSOLE_COMMAND_EEHIDE -static int command_eeprom_hide(int argc, char **argv) -{ - int block = 0; - char *e; - - if (argc < 2) - return EC_ERROR_PARAM_COUNT; - - block = strtoi(argv[1], &e, 0); - if (*e) - return EC_ERROR_PARAM1; - - ccprintf("Hiding block %d\n", block); - return eeprom_hide(block); -} -DECLARE_CONSOLE_COMMAND(eehide, command_eeprom_hide, - "block", - "Hide a block of EEPROM"); -#endif - - -/*****************************************************************************/ -/* Initialization */ - - -int eeprom_init(void) -{ - /* Enable the EEPROM module in run and sleep modes. */ - clock_enable_peripheral(CGC_OFFSET_EEPROM, 0x1, - CGC_MODE_RUN | CGC_MODE_SLEEP); - - /* Wait for internal EEPROM init to finish */ - wait_for_done(); - - /* Store block count */ - block_count = LM4_EEPROM_EESIZE >> 16; - - /* - * Handle resetting the EEPROM module to clear state from a previous - * error condition. - */ - if (LM4_EEPROM_EESUPP & 0xc0) { - LM4_SYSTEM_SREEPROM = 1; - clock_wait_cycles(200); - LM4_SYSTEM_SREEPROM = 0; - - /* Wait again for internal init to finish */ - clock_wait_cycles(6); - wait_for_done(); - - /* Fail if error condition didn't clear */ - if (LM4_EEPROM_EESUPP & 0xc0) - return EC_ERROR_UNKNOWN; - } - - return EC_SUCCESS; -} |