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Diffstat (limited to 'src/ec/quanta/it8518/ec.c')
| -rw-r--r-- | src/ec/quanta/it8518/ec.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/ec/quanta/it8518/ec.c b/src/ec/quanta/it8518/ec.c new file mode 100644 index 0000000000..4798ceea55 --- /dev/null +++ b/src/ec/quanta/it8518/ec.c @@ -0,0 +1,208 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2013 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 + */ + + + +#include <console/console.h> + +#ifndef __PRE_RAM__ +#include <device/device.h> +#include <device/pnp.h> +#endif + +#include <stdlib.h> +#include <arch/io.h> +#include <delay.h> +#include "ec.h" +#include "chip.h" + +/* helper functions from drivers/pc80/keyboard.c */ +static int input_buffer_empty(u16 status_reg) +{ + u32 timeout; + for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(status_reg) & KBD_IBF); + timeout--) { + udelay(1000);; + } + + if (!timeout) { + printk(BIOS_WARNING, "EC-IT8518 Unexpected input buffer full\n"); + printk(BIOS_WARNING, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg)); + } + return !!timeout; +} + + +static int output_buffer_full(u16 status_reg) +{ + u32 timeout; + for(timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(status_reg) + & KBD_OBF) == 0); timeout--) { + udelay(1000);; + } + + if (!timeout) { + printk(BIOS_INFO, "EC-IT8518 output buffer result timeout\n"); + printk(BIOS_INFO, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg)); + } + return !!timeout; +} + + + +/* The IT8518 60/64 EC registers are the same command/status IB/OB KBC pair. + * Check status from 64 port before each command. + * + * Ex. Get panel ID command C43/D77 + * Check IBF empty. Then Write 0x43(CMD) to 0x64 Port + * Check IBF empty. Then Write 0x77(DATA) to 0x60 Port + * Check OBF set. Then Get Data(0x03:panel ID) from 0x60 + * Different commands return may or may not respond and may have multiple + * bytes. Keep it simple for nor + */ + +u8 ec_kbc_read_ob(void) +{ + if (!output_buffer_full(KBD_STATUS)) return 0; + return inb(KBD_DATA); +} + +void ec_kbc_write_cmd(u8 cmd) +{ + if (!input_buffer_empty(KBD_STATUS)) return; + outb(cmd, KBD_COMMAND); +} + +void ec_kbc_write_ib(u8 data) +{ + if (!input_buffer_empty(KBD_STATUS)) return; + outb(data, KBD_DATA); +} + + +/* + * These functions are for accessing the IT8518 device RAM space via 0x66/0x68 + */ + +u8 ec_read_ob(void) +{ + if (!output_buffer_full(EC_SC)) return 0; + return inb(EC_DATA); +} + +void ec_write_cmd(u8 cmd) +{ + if (!input_buffer_empty(EC_SC)) return; + outb(cmd, EC_SC); +} + +void ec_write_ib(u8 data) +{ + if (!input_buffer_empty(EC_SC)) return; + outb(data, EC_DATA); +} + +u8 ec_read(u16 addr) +{ + ec_write_cmd(RD_EC); + ec_write_ib(addr); + return ec_read_ob(); +} + +void ec_write(u16 addr, u8 data) +{ + ec_write_cmd(WR_EC); + ec_write_ib(addr); + ec_write_ib(data); +} + +#ifndef __PRE_RAM__ + +u8 ec_it8518_get_event(void) +{ + u8 cmd = 0; + u8 status = inb(EC_SC); + if (status & SCI_EVT) { + ec_write_cmd(QR_EC); + cmd = ec_read_ob(); + } else if ( status & SMI_EVT) { + ec_kbc_write_cmd(EC_KBD_SMI_EVENT); + cmd = ec_kbc_read_ob(); + } + return cmd; +} + +void ec_it8518_enable_wake_events(void) +{ + /* + * Set the bit in ECRAM that will enable the Lid switch as a wake source + */ + u8 reg8 = ec_read(EC_WAKE_SRC_ENABLE); + ec_write(EC_WAKE_SRC_ENABLE, reg8 | EC_LID_WAKE_ENABLE); +} + +#ifndef __SMM__ +static void it8518_init(device_t dev) +{ + struct ec_quanta_it8518_config *conf = dev->chip_info; + + + if (!dev->enabled) + return; + + printk(BIOS_DEBUG, "Quanta IT8518: Initializing keyboard.\n"); + pc_keyboard_init(&conf->keyboard); +} + + +static void it8518_read_resources(device_t dev) +{ + /* This function avoids an error on serial console. */ +} + + +static void it8518_enable_resources(device_t dev) +{ + /* This function avoids an error on serial console. */ +} + +static struct device_operations ops = { + .init = it8518_init, + .read_resources = it8518_read_resources, + .enable_resources = it8518_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_quanta_it8518_ops = { + CHIP_NAME("QUANTA IT8518 EC") + .enable_dev = enable_dev +}; +#endif /* ! __SMM__ */ +#endif /* ! __PRE_RAM__ */ |