diff options
Diffstat (limited to 'src/ec/google/chromeec/ec.c')
| -rw-r--r-- | src/ec/google/chromeec/ec.c | 519 |
1 files changed, 519 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/ec.c b/src/ec/google/chromeec/ec.c new file mode 100644 index 0000000000..4057f2a03b --- /dev/null +++ b/src/ec/google/chromeec/ec.c @@ -0,0 +1,519 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2012 The Chromium OS Authors. All rights reserved. + * + * 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 + */ + +#include <stdint.h> +#include <console/console.h> +#include <arch/io.h> +#include <delay.h> + +#ifdef __PRE_RAM__ +#include <arch/romcc_io.h> +#else +#include <device/device.h> +#include <device/pnp.h> +#include <elog.h> +#include <stdlib.h> +#include <string.h> +#include <reset.h> +#include <arch/hlt.h> +#include "chip.h" +#endif +#include "ec.h" +#include "ec_commands.h" +#include <vendorcode/google/chromeos/chromeos.h> + +/* an internal API to send a command to the EC and wait for response. */ +struct chromeec_command { + u8 cmd_code; /* command code in, status out */ + u8 cmd_version; /* command version */ + const void* cmd_data_in; /* command data, if any */ + void* cmd_data_out; /* command response, if any */ + u16 cmd_size_in; /* size of command data */ + u16 cmd_size_out; /* expected size of command response in, + * actual received size out */ +}; + +static int google_chromeec_wait_ready(u16 port) +{ + u8 ec_status = inb(port); + u32 time_count = 0; + + /* + * One second is more than plenty for any EC operation to complete + * (and the bus accessing/code execution) overhead will make the + * timeout even longer. + */ +#define MAX_EC_TIMEOUT_US 1000000 + + while (ec_status & + (EC_LPC_CMDR_PENDING | EC_LPC_CMDR_BUSY)) { + udelay(1); + if (time_count++ == MAX_EC_TIMEOUT_US) + return -1; + ec_status = inb(port); + } + return 0; +} + +static int google_chromeec_cmd_args_supported(void) +{ + if (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID) == 'E' && + inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1) == 'C' && + (inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_HOST_CMD_FLAGS) & + EC_HOST_CMD_FLAG_LPC_ARGS_SUPPORTED)) + return 1; + + return 0; +} + +static int google_chromeec_command_old(struct chromeec_command *cec_command) +{ + int i; + + if (cec_command->cmd_version) { + printk(BIOS_ERR, "Invalid version for command protocol!\n"); + return 1; + } + + if (google_chromeec_wait_ready(EC_LPC_ADDR_HOST_CMD)) { + printk(BIOS_ERR, "Timeout waiting for EC ready!\n"); + return 1; + } + + /* Copy command data, if any. */ + for (i = 0; i < cec_command->cmd_size_in; i++) + outb(((char*)cec_command->cmd_data_in)[i], + EC_LPC_ADDR_OLD_PARAM + i); + + /* Issue the command. */ + outb(cec_command->cmd_code, EC_LPC_ADDR_HOST_CMD); + + if (google_chromeec_wait_ready(EC_LPC_ADDR_HOST_CMD)) { + printk(BIOS_ERR, "Timeout waiting for EC process command %d!\n", + cec_command->cmd_code); + return 1; + } + + for (i = 0; i < cec_command->cmd_size_out; i++) + ((char*)cec_command->cmd_data_out)[i] = + inb(EC_LPC_ADDR_OLD_PARAM + i); + cec_command->cmd_code = inb(EC_LPC_ADDR_HOST_DATA); + return 0; +} + +static int google_chromeec_command(struct chromeec_command *cec_command) +{ + struct ec_lpc_host_args args; + const u8 *d; + u8 *dout; + u8 cmd_code = cec_command->cmd_code; + int csum; + int i; + + /* Fall back to old command protocol if necessary */ + if (!google_chromeec_cmd_args_supported()) + return google_chromeec_command_old(cec_command); + + /* Fill in args */ + args.flags = EC_HOST_ARGS_FLAG_FROM_HOST; + args.command_version = cec_command->cmd_version; + args.data_size = cec_command->cmd_size_in; + + /* Initialize checksum */ + csum = cmd_code + args.flags + args.command_version + args.data_size; + + /* Write data and update checksum */ + for (i = 0, d = (const u8 *)cec_command->cmd_data_in; + i < cec_command->cmd_size_in; i++, d++) { + outb(*d, EC_LPC_ADDR_HOST_PARAM + i); + csum += *d; + } + + /* Finalize checksum and write args */ + args.checksum = (u8)csum; + for (i = 0, d = (const u8 *)&args; i < sizeof(args); i++, d++) + outb(*d, EC_LPC_ADDR_HOST_ARGS + i); + + + /* Issue the command */ + outb(cmd_code, EC_LPC_ADDR_HOST_CMD); + + if (google_chromeec_wait_ready(EC_LPC_ADDR_HOST_CMD)) { + printk(BIOS_ERR, "Timeout waiting for EC process command %d!\n", + cec_command->cmd_code); + return 1; + } + + /* Check result */ + cec_command->cmd_code = inb(EC_LPC_ADDR_HOST_DATA); + if (cec_command->cmd_code) + return 1; + + /* Read back args */ + for (i = 0, dout = (u8 *)&args; i < sizeof(args); i++, dout++) + *dout = inb(EC_LPC_ADDR_HOST_ARGS + i); + + /* + * If EC didn't modify args flags, then somehow we sent a new-style + * command to an old EC, which means it would have read its params + * from the wrong place. + */ + if (!(args.flags & EC_HOST_ARGS_FLAG_TO_HOST)) { + printk(BIOS_ERR, "EC protocol mismatch\n"); + return 1; + } + + if (args.data_size > cec_command->cmd_size_out) { + printk(BIOS_ERR, "EC returned too much data\n"); + return 1; + } + cec_command->cmd_size_out = args.data_size; + + /* Start calculating response checksum */ + csum = cmd_code + args.flags + args.command_version + args.data_size; + + /* Read data, if any */ + for (i = 0, dout = (u8 *)cec_command->cmd_data_out; + i < args.data_size; i++, dout++) { + *dout = inb(EC_LPC_ADDR_HOST_PARAM + i); + csum += *dout; + } + + /* Verify checksum */ + if (args.checksum != (u8)csum) { + printk(BIOS_ERR, "EC response has invalid checksum\n"); + return 1; + } + + return 0; +} + +int google_chromeec_kbbacklight(int percent) +{ + struct chromeec_command cec_cmd; + struct ec_params_pwm_set_keyboard_backlight cmd_backlight; + struct ec_response_pwm_get_keyboard_backlight rsp_backlight; + /* if they were dumb, help them out */ + percent = percent % 101; + cec_cmd.cmd_code = EC_CMD_PWM_SET_KEYBOARD_BACKLIGHT; + cec_cmd.cmd_version = 0; + cmd_backlight.percent = percent; + cec_cmd.cmd_data_in = &cmd_backlight; + cec_cmd.cmd_data_out = &rsp_backlight; + cec_cmd.cmd_size_in = sizeof(cmd_backlight); + cec_cmd.cmd_size_out = sizeof(rsp_backlight); + google_chromeec_command(&cec_cmd); + printk(BIOS_DEBUG, "Google Chrome set keyboard backlight: %x status (%x)\n", + rsp_backlight.percent, cec_cmd.cmd_code); + return cec_cmd.cmd_code; + +} + +void google_chromeec_post(u8 postcode) +{ + /* backlight is a percent. postcode is a u8. + * Convert the u8 to %. + */ + postcode = (postcode/4) + (postcode/8); + google_chromeec_kbbacklight(postcode); +} + +/* + * Query the EC for specified mask indicating enabled events. + * The EC maintains separate event masks for SMI, SCI and WAKE. + */ +static u32 google_chromeec_get_mask(u8 type) +{ + struct ec_params_host_event_mask req; + struct ec_response_host_event_mask rsp; + struct chromeec_command cmd; + + cmd.cmd_code = type; + cmd.cmd_version = 0; + cmd.cmd_data_in = &req; + cmd.cmd_size_in = sizeof(req); + cmd.cmd_data_out = &rsp; + cmd.cmd_size_out = sizeof(rsp); + + if (google_chromeec_command(&cmd) == 0) + return rsp.mask; + return 0; +} + +u32 google_chromeec_get_events_b(void) +{ + return google_chromeec_get_mask(EC_CMD_HOST_EVENT_GET_B); +} + +#ifndef __PRE_RAM__ + +static int google_chromeec_set_mask(u8 type, u32 mask) +{ + struct ec_params_host_event_mask req; + struct ec_response_host_event_mask rsp; + struct chromeec_command cmd; + + req.mask = mask; + cmd.cmd_code = type; + cmd.cmd_version = 0; + cmd.cmd_data_in = &req; + cmd.cmd_size_in = sizeof(req); + cmd.cmd_data_out = &rsp; + cmd.cmd_size_out = sizeof(rsp); + + return google_chromeec_command(&cmd); +} + +int google_chromeec_set_sci_mask(u32 mask) +{ + printk(BIOS_DEBUG, "Chrome EC: Set SCI mask to 0x%08x\n", mask); + return google_chromeec_set_mask( + EC_CMD_HOST_EVENT_SET_SCI_MASK, mask); +} + +int google_chromeec_set_smi_mask(u32 mask) +{ + printk(BIOS_DEBUG, "Chrome EC: Set SMI mask to 0x%08x\n", mask); + return google_chromeec_set_mask( + EC_CMD_HOST_EVENT_SET_SMI_MASK, mask); +} + +int google_chromeec_set_wake_mask(u32 mask) +{ + printk(BIOS_DEBUG, "Chrome EC: Set WAKE mask to 0x%08x\n", mask); + return google_chromeec_set_mask( + EC_CMD_HOST_EVENT_SET_WAKE_MASK, mask); +} + +u32 google_chromeec_get_wake_mask(void) +{ + return google_chromeec_get_mask( + EC_CMD_HOST_EVENT_GET_WAKE_MASK); +} + +#if CONFIG_ELOG +/* Find the last port80 code from the previous boot */ +static u16 google_chromeec_get_port80_last_boot(void) +{ + struct ec_response_port80_last_boot rsp; + struct chromeec_command cmd = { + .cmd_code = EC_CMD_PORT80_LAST_BOOT, + .cmd_data_out = &rsp, + .cmd_size_out = sizeof(rsp), + }; + + /* Get last port80 code */ + if (google_chromeec_command(&cmd) == 0) + return rsp.code; + + return 0; +} +#endif + +void google_chromeec_log_events(u32 mask) +{ +#if CONFIG_ELOG + u8 event; + u16 code; + + /* Find the last port80 code */ + code = google_chromeec_get_port80_last_boot(); + + /* Log the last post code only if it is abornmal */ + if (code > 0 && code != POST_OS_BOOT && code != POST_OS_RESUME) + printk(BIOS_DEBUG, "Chrome EC: Last POST code was 0x%02x\n", + code); + + while ((event = google_chromeec_get_event()) != 0) { + if (EC_HOST_EVENT_MASK(event) & mask) + elog_add_event_byte(ELOG_TYPE_EC_EVENT, event); + } +#endif +} + +u8 google_chromeec_get_event(void) +{ + if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) { + printk(BIOS_ERR, "Timeout waiting for EC ready!\n"); + return 1; + } + + /* Issue the ACPI query-event command */ + outb(EC_CMD_ACPI_QUERY_EVENT, EC_LPC_ADDR_ACPI_CMD); + + if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) { + printk(BIOS_ERR, "Timeout waiting for EC QUERY_EVENT!\n"); + return 0; + } + + /* Event (or 0 if none) is returned directly in the data byte */ + return inb(EC_LPC_ADDR_ACPI_DATA); +} + +u16 google_chromeec_get_board_version(void) +{ + struct chromeec_command cmd; + struct ec_response_board_version board_v; + + cmd.cmd_code = EC_CMD_GET_BOARD_VERSION; + cmd.cmd_version = 0; + cmd.cmd_size_in = 0; + cmd.cmd_size_out = sizeof(board_v); + cmd.cmd_data_out = &board_v; + + if (google_chromeec_command(&cmd) != 0) + return 0; + + return board_v.board_version; +} + +int google_chromeec_set_usb_charge_mode(u8 port_id, enum usb_charge_mode mode) +{ + struct chromeec_command cmd; + struct ec_params_usb_charge_set_mode set_mode = { + .usb_port_id = port_id, + .mode = mode, + }; + + cmd.cmd_code = EC_CMD_USB_CHARGE_SET_MODE; + cmd.cmd_version = 0; + cmd.cmd_size_in = sizeof(set_mode); + cmd.cmd_data_in = &set_mode; + cmd.cmd_size_out = 0; + cmd.cmd_data_out = NULL; + + return google_chromeec_command(&cmd); +} + +#ifndef __SMM__ + +static +int google_chromeec_hello(void) +{ + struct chromeec_command cec_cmd; + struct ec_params_hello cmd_hello; + struct ec_response_hello rsp_hello; + cmd_hello.in_data = 0x10203040; + cec_cmd.cmd_code = EC_CMD_HELLO; + cec_cmd.cmd_version = 0; + cec_cmd.cmd_data_in = &cmd_hello.in_data; + cec_cmd.cmd_data_out = &rsp_hello.out_data; + cec_cmd.cmd_size_in = sizeof(cmd_hello.in_data); + cec_cmd.cmd_size_out = sizeof(rsp_hello.out_data); + google_chromeec_command(&cec_cmd); + printk(BIOS_DEBUG, "Google Chrome EC: Hello got back %x status (%x)\n", + rsp_hello.out_data, cec_cmd.cmd_code); + return cec_cmd.cmd_code; +} + +static int ec_image_type; /* Cached EC image type (ro or rw). */ + +static void google_chromeec_init(device_t dev) +{ + struct chromeec_command cec_cmd; + struct ec_google_chromeec_config *conf = dev->chip_info; + struct ec_response_get_version lpcv_cmd; + + if (!dev->enabled) + return; + + printk(BIOS_DEBUG, "Google Chrome EC: Initializing keyboard.\n"); + pc_keyboard_init(&conf->keyboard); + + google_chromeec_hello(); + + memset(&lpcv_cmd, 0, sizeof(lpcv_cmd)); + cec_cmd.cmd_code = EC_CMD_GET_VERSION; + cec_cmd.cmd_version = 0; + cec_cmd.cmd_data_out = &lpcv_cmd; + cec_cmd.cmd_size_in = 0; + cec_cmd.cmd_size_out = sizeof(lpcv_cmd); + google_chromeec_command(&cec_cmd); + + if (cec_cmd.cmd_code) { + printk(BIOS_DEBUG, + "Google Chrome EC: version command failed!\n"); + } else { + printk(BIOS_DEBUG, "Google Chrome EC: version:\n"); + printk(BIOS_DEBUG, " ro: %s\n", lpcv_cmd.version_string_ro); + printk(BIOS_DEBUG, " rw: %s\n", lpcv_cmd.version_string_rw); + printk(BIOS_DEBUG, " running image: %d\n", + lpcv_cmd.current_image); + ec_image_type = lpcv_cmd.current_image; + } + + if (cec_cmd.cmd_code || + (recovery_mode_enabled() && + (lpcv_cmd.current_image != EC_IMAGE_RO))) { + struct ec_params_reboot_ec reboot_ec; + /* Reboot the EC and make it come back in RO mode */ + reboot_ec.cmd = EC_REBOOT_COLD; + reboot_ec.flags = 0; + cec_cmd.cmd_code = EC_CMD_REBOOT_EC; + cec_cmd.cmd_version = 0; + cec_cmd.cmd_data_in = &reboot_ec; + cec_cmd.cmd_size_in = sizeof(reboot_ec); + cec_cmd.cmd_size_out = 0; /* ignore response, if any */ + printk(BIOS_DEBUG, "Rebooting with EC in RO mode:\n"); + google_chromeec_command(&cec_cmd); + udelay(1000); + hard_reset(); + hlt(); + } + +} + +static void google_chromeec_read_resources(device_t dev) +{ + /* Nothing, but this function avoids an error on serial console. */ +} + +static void google_chromeec_enable_resources(device_t dev) +{ + /* Nothing, but this function avoids an error on serial console. */ +} + +static struct device_operations ops = { + .init = google_chromeec_init, + .read_resources = google_chromeec_read_resources, + .enable_resources = google_chromeec_enable_resources +}; + +static struct pnp_info pnp_dev_info[] = { + { &ops, 0, 0, { 0, 0 }, } +}; + +static void enable_dev(device_t dev) +{ + pnp_enable_devices(dev, &pnp_ops, ARRAY_SIZE(pnp_dev_info), + pnp_dev_info); +} + +struct chip_operations ec_google_chromeec_ops = { + CHIP_NAME("Google Chrome EC") + .enable_dev = enable_dev, +}; + +int google_ec_running_ro(void) +{ + return (ec_image_type == EC_IMAGE_RO); +} +#endif /* ! __SMM__ */ + +#endif /* ! __PRE_RAM__ */ |