| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <delay.h> |
| #include <device/device.h> |
| #include <device/pnp.h> |
| #include <pc80/keyboard.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); |
| } |
| |
| |
| 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); |
| } |
| |
| static void it8518_init(struct device *dev) |
| { |
| if (!dev->enabled) |
| return; |
| |
| printk(BIOS_DEBUG, "Quanta IT8518: Initializing keyboard.\n"); |
| pc_keyboard_init(NO_AUX_DEVICE); |
| } |
| |
| static struct device_operations ops = { |
| .init = it8518_init, |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources, |
| }; |
| |
| static struct pnp_info pnp_dev_info[] = { |
| { NULL, 0, 0, 0, } |
| }; |
| |
| static void enable_dev(struct device *dev) |
| { |
| pnp_enable_devices(dev, &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 |
| }; |