| /* |
| * This file is part of the flashrom project. |
| * |
| * Copyright (C) 2007, 2008, 2009 Carl-Daniel Hailfinger |
| * Copyright (C) 2008 Ronald Hoogenboom <ronald@zonnet.nl> |
| * Copyright (C) 2008 coresystems GmbH |
| * Copyright (C) 2010 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /* |
| * Contains the ITE IT85* SPI specific routines |
| */ |
| |
| #if defined(__i386__) || defined(__x86_64__) |
| |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "flash.h" |
| #include "spi.h" |
| #include "programmer.h" |
| #include "hwaccess.h" |
| |
| #define MAX_TIMEOUT 100000 |
| #define MAX_TRY 5 |
| |
| /* Constants for I/O ports */ |
| #define ITE_SUPERIO_PORT1 0x2e |
| #define ITE_SUPERIO_PORT2 0x4e |
| |
| /* Legacy I/O */ |
| #define LEGACY_KBC_PORT_DATA 0x60 |
| #define LEGACY_KBC_PORT_CMD 0x64 |
| |
| /* Constants for Logical Device registers */ |
| #define LDNSEL 0x07 |
| |
| /* These are standard Super I/O 16-bit base address registers */ |
| #define SHM_IO_BAR0 0x60 /* big-endian, this is high bits */ |
| #define SHM_IO_BAR1 0x61 |
| |
| /* The 8042 keyboard controller uses an input buffer and an output buffer to |
| * communicate with the host CPU. Both buffers are 1-byte depth. That means |
| * IBF is set to 1 when the host CPU sends a command to the input buffer |
| * of the EC. IBF is cleared to 0 once the command is read by the EC. |
| */ |
| #define KB_IBF (1 << 1) /* Input Buffer Full */ |
| #define KB_OBF (1 << 0) /* Output Buffer Full */ |
| |
| /* IT8502 supports two access modes: |
| * LPC_MEMORY: through the memory window in 0xFFFFFxxx (follow mode) |
| * LPC_IO: through I/O port (so called indirect memory) |
| */ |
| #undef LPC_MEMORY |
| #define LPC_IO |
| |
| #ifdef LPC_IO |
| /* macro to fill in indirect-access registers. */ |
| #define INDIRECT_A0(base, value) OUTB(value, (base) + 0) /* little-endian */ |
| #define INDIRECT_A1(base, value) OUTB(value, (base) + 1) |
| #define INDIRECT_A2(base, value) OUTB(value, (base) + 2) |
| #define INDIRECT_A3(base, value) OUTB(value, (base) + 3) |
| #define INDIRECT_READ(base) INB((base) + 4) |
| #define INDIRECT_WRITE(base, value) OUTB(value, (base) + 4) |
| #endif /* LPC_IO */ |
| |
| #ifdef LPC_IO |
| unsigned int shm_io_base; |
| #endif |
| unsigned char *ce_high, *ce_low; |
| static int it85xx_scratch_rom_reenter = 0; |
| |
| /* This function will poll the keyboard status register until either |
| * an expected value shows up, or the timeout is reached. |
| * timeout is in usec. |
| * |
| * Returns: 0 -- the expected value showed up. |
| * 1 -- timeout. |
| */ |
| static int wait_for(const unsigned int mask, const unsigned int expected_value, |
| const int timeout, const char * error_message, |
| const char * function_name, const int lineno) |
| { |
| int time_passed; |
| |
| for (time_passed = 0;; ++time_passed) { |
| if ((INB(LEGACY_KBC_PORT_CMD) & mask) == expected_value) |
| return 0; |
| if (time_passed >= timeout) |
| break; |
| programmer_delay(1); |
| } |
| if (error_message) |
| msg_perr("%s():%d %s", function_name, lineno, error_message); |
| return 1; |
| } |
| |
| /* IT8502 employs a scratch RAM when flash is being updated. Call the following |
| * two functions before/after flash erase/program. */ |
| void it85xx_enter_scratch_rom(void) |
| { |
| int ret, tries; |
| |
| msg_pdbg("%s():%d was called ...\n", __func__, __LINE__); |
| if (it85xx_scratch_rom_reenter > 0) |
| return; |
| |
| #if 0 |
| /* FIXME: this a workaround for the bug that SMBus signal would |
| * interfere the EC firmware update. Should be removed if |
| * we find out the root cause. */ |
| ret = system("stop powerd >&2"); |
| if (ret) |
| msg_perr("Cannot stop powerd.\n"); |
| #endif |
| |
| for (tries = 0; tries < MAX_TRY; ++tries) { |
| /* Wait until IBF (input buffer) is not full. */ |
| if (wait_for(KB_IBF, 0, MAX_TIMEOUT, |
| "* timeout at waiting for IBF==0.\n", |
| __func__, __LINE__)) |
| continue; |
| |
| /* Copy EC firmware to SRAM. */ |
| OUTB(0xb4, LEGACY_KBC_PORT_CMD); |
| |
| /* Confirm EC has taken away the command. */ |
| if (wait_for(KB_IBF, 0, MAX_TIMEOUT, |
| "* timeout at taking command.\n", |
| __func__, __LINE__)) |
| continue; |
| |
| /* Waiting for OBF (output buffer) has data. |
| * Note sometimes the replied command might be stolen by kernel |
| * ISR so that it is okay as long as the command is 0xFA. */ |
| if (wait_for(KB_OBF, KB_OBF, MAX_TIMEOUT, NULL, NULL, 0)) |
| msg_pdbg("%s():%d * timeout at waiting for OBF.\n", |
| __func__, __LINE__); |
| if ((ret = INB(LEGACY_KBC_PORT_DATA)) == 0xFA) { |
| break; |
| } else { |
| msg_perr("%s():%d * not run on SRAM ret=%d\n", |
| __func__, __LINE__, ret); |
| continue; |
| } |
| } |
| |
| if (tries < MAX_TRY) { |
| /* EC already runs on SRAM */ |
| it85xx_scratch_rom_reenter++; |
| msg_pdbg("%s():%d * SUCCESS.\n", __func__, __LINE__); |
| } else { |
| msg_perr("%s():%d * Max try reached.\n", __func__, __LINE__); |
| } |
| } |
| |
| void it85xx_exit_scratch_rom(void) |
| { |
| #if 0 |
| int ret; |
| #endif |
| int tries; |
| |
| msg_pdbg("%s():%d was called ...\n", __func__, __LINE__); |
| if (it85xx_scratch_rom_reenter <= 0) |
| return; |
| |
| for (tries = 0; tries < MAX_TRY; ++tries) { |
| /* Wait until IBF (input buffer) is not full. */ |
| if (wait_for(KB_IBF, 0, MAX_TIMEOUT, |
| "* timeout at waiting for IBF==0.\n", |
| __func__, __LINE__)) |
| continue; |
| |
| /* Exit SRAM. Run on flash. */ |
| OUTB(0xFE, LEGACY_KBC_PORT_CMD); |
| |
| /* Confirm EC has taken away the command. */ |
| if (wait_for(KB_IBF, 0, MAX_TIMEOUT, |
| "* timeout at taking command.\n", |
| __func__, __LINE__)) { |
| /* We cannot ensure if EC has exited update mode. |
| * If EC is in normal mode already, a further 0xFE |
| * command will reboot system. So, exit loop here. */ |
| tries = MAX_TRY; |
| break; |
| } |
| |
| break; |
| } |
| |
| if (tries < MAX_TRY) { |
| it85xx_scratch_rom_reenter = 0; |
| msg_pdbg("%s():%d * SUCCESS.\n", __func__, __LINE__); |
| } else { |
| msg_perr("%s():%d * Max try reached.\n", __func__, __LINE__); |
| } |
| |
| #if 0 |
| /* FIXME: this a workaround for the bug that SMBus signal would |
| * interfere the EC firmware update. Should be removed if |
| * we find out the root cause. */ |
| ret = system("start powerd >&2"); |
| if (ret) |
| msg_perr("Cannot start powerd again.\n"); |
| #endif |
| } |
| |
| static int it85xx_shutdown(void *data) |
| { |
| msg_pdbg("%s():%d\n", __func__, __LINE__); |
| it85xx_exit_scratch_rom(); |
| |
| return 0; /* FIXME: Should probably return something meaningful */ |
| } |
| |
| static int it85xx_spi_common_init(struct superio s) |
| { |
| chipaddr base; |
| |
| msg_pdbg("%s():%d superio.vendor=0x%02x\n", __func__, __LINE__, |
| s.vendor); |
| |
| if (register_shutdown(it85xx_shutdown, NULL)) |
| return 1; |
| |
| #ifdef LPC_IO |
| /* Get LPCPNP of SHM. That's big-endian. */ |
| sio_write(s.port, LDNSEL, 0x0F); /* Set LDN to SHM (0x0F) */ |
| shm_io_base = (sio_read(s.port, SHM_IO_BAR0) << 8) + |
| sio_read(s.port, SHM_IO_BAR1); |
| msg_pdbg("%s():%d shm_io_base=0x%04x\n", __func__, __LINE__, |
| shm_io_base); |
| |
| /* These pointers are not used directly. They will be send to EC's |
| * register for indirect access. */ |
| base = 0xFFFFF000; |
| ce_high = ((unsigned char *)base) + 0xE00; /* 0xFFFFFE00 */ |
| ce_low = ((unsigned char *)base) + 0xD00; /* 0xFFFFFD00 */ |
| |
| /* pre-set indirect-access registers since in most of cases they are |
| * 0xFFFFxx00. */ |
| INDIRECT_A0(shm_io_base, base & 0xFF); |
| INDIRECT_A2(shm_io_base, (base >> 16) & 0xFF); |
| INDIRECT_A3(shm_io_base, (base >> 24)); |
| #endif |
| #ifdef LPC_MEMORY |
| /* FIXME: We should block accessing that region for anything else. |
| * Major TODO here, and it will be a lot of work. |
| */ |
| base = (chipaddr)physmap("it85 communication", 0xFFFFF000, 0x1000); |
| msg_pdbg("%s():%d base=0x%08x\n", __func__, __LINE__, |
| (unsigned int)base); |
| ce_high = (unsigned char *)(base + 0xE00); /* 0xFFFFFE00 */ |
| ce_low = (unsigned char *)(base + 0xD00); /* 0xFFFFFD00 */ |
| #endif |
| |
| return 0; |
| } |
| |
| static int it85xx_spi_send_command(struct flashctx *flash, |
| unsigned int writecnt, unsigned int readcnt, |
| const unsigned char *writearr, |
| unsigned char *readarr); |
| |
| static const struct spi_programmer spi_programmer_it85xx = { |
| .type = SPI_CONTROLLER_IT85XX, |
| .max_data_read = 64, |
| .max_data_write = 64, |
| .command = it85xx_spi_send_command, |
| .multicommand = default_spi_send_multicommand, |
| .read = default_spi_read, |
| .write_256 = default_spi_write_256, |
| .write_aai = default_spi_write_aai, |
| }; |
| |
| int it85xx_spi_init(struct superio s) |
| { |
| int ret; |
| |
| if (!(internal_buses_supported & BUS_FWH)) { |
| msg_pdbg("%s():%d buses not support FWH\n", __func__, __LINE__); |
| return 1; |
| } |
| ret = it85xx_spi_common_init(s); |
| msg_pdbg("FWH: %s():%d ret=%d\n", __func__, __LINE__, ret); |
| if (!ret) { |
| msg_pdbg("%s: internal_buses_supported=0x%x\n", __func__, |
| internal_buses_supported); |
| /* Check for FWH because IT85 listens to FWH cycles. |
| * FIXME: The big question is whether FWH cycles are necessary |
| * for communication even if LPC_IO is defined. |
| */ |
| if (internal_buses_supported & BUS_FWH) |
| msg_pdbg("Registering IT85 SPI.\n"); |
| /* FIXME: Really leave FWH enabled? We can't use this region |
| * anymore since accessing it would mess up IT85 communication. |
| * If we decide to disable FWH for this region, we should print |
| * a debug message about it. |
| */ |
| /* Set this as SPI controller. */ |
| register_spi_programmer(&spi_programmer_it85xx); |
| } |
| return ret; |
| } |
| |
| /* According to ITE 8502 document, the procedure to follow mode is following: |
| * 1. write 0x00 to LPC/FWH address 0xffff_fexxh (drive CE# high) |
| * 2. write data to LPC/FWH address 0xffff_fdxxh (drive CE# low and MOSI |
| * with data) |
| * 3. read date from LPC/FWH address 0xffff_fdxxh (drive CE# low and get |
| * data from MISO) |
| */ |
| static int it85xx_spi_send_command(struct flashctx *flash, |
| unsigned int writecnt, unsigned int readcnt, |
| const unsigned char *writearr, |
| unsigned char *readarr) |
| { |
| int i; |
| |
| it85xx_enter_scratch_rom(); |
| /* Exit scratch ROM ONLY when programmer shuts down. Otherwise, the |
| * temporary flash state may halt the EC. |
| */ |
| |
| #ifdef LPC_IO |
| INDIRECT_A1(shm_io_base, (((unsigned long int)ce_high) >> 8) & 0xff); |
| INDIRECT_WRITE(shm_io_base, 0xFF); /* Write anything to this address.*/ |
| INDIRECT_A1(shm_io_base, (((unsigned long int)ce_low) >> 8) & 0xff); |
| #endif |
| #ifdef LPC_MEMORY |
| mmio_writeb(0, ce_high); |
| #endif |
| for (i = 0; i < writecnt; ++i) { |
| #ifdef LPC_IO |
| INDIRECT_WRITE(shm_io_base, writearr[i]); |
| #endif |
| #ifdef LPC_MEMORY |
| mmio_writeb(writearr[i], ce_low); |
| #endif |
| } |
| for (i = 0; i < readcnt; ++i) { |
| #ifdef LPC_IO |
| readarr[i] = INDIRECT_READ(shm_io_base); |
| #endif |
| #ifdef LPC_MEMORY |
| readarr[i] = mmio_readb(ce_low); |
| #endif |
| } |
| #ifdef LPC_IO |
| INDIRECT_A1(shm_io_base, (((unsigned long int)ce_high) >> 8) & 0xff); |
| INDIRECT_WRITE(shm_io_base, 0xFF); /* Write anything to this address.*/ |
| #endif |
| #ifdef LPC_MEMORY |
| mmio_writeb(0, ce_high); |
| #endif |
| |
| return 0; |
| } |
| |
| #endif |