| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <arch/io.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pnp.h> |
| #include <pc80/keyboard.h> |
| #include <stdint.h> |
| #include "mec5035.h" |
| |
| static const u16 MAILBOX_INDEX = 0x910; |
| static const u16 MAILBOX_DATA = MAILBOX_INDEX + 1; |
| |
| static inline u8 __get_mailbox_register(u8 index) |
| { |
| outb(index + 0x10, MAILBOX_INDEX); |
| return inb(MAILBOX_DATA); |
| } |
| |
| static inline void __set_mailbox_register(u8 index, u8 data) |
| { |
| outb(index + 0x10, MAILBOX_INDEX); |
| outb(data, MAILBOX_DATA); |
| } |
| |
| static void wait_ec(void) |
| { |
| u8 busy; |
| do { |
| outb(0, MAILBOX_INDEX); |
| busy = inb(MAILBOX_DATA); |
| } while (busy); |
| } |
| |
| |
| static enum cb_err read_mailbox_regs(u8 *data, u8 start, u8 count) |
| { |
| if (start + count >= NUM_REGISTERS) { |
| printk(BIOS_ERR, "%s: Invalid start or count argument.\n", __func__); |
| return CB_ERR_ARG; |
| } |
| |
| while (count--) { |
| *data = __get_mailbox_register(start); |
| data++; |
| start++; |
| } |
| |
| return CB_SUCCESS; |
| } |
| |
| static enum cb_err write_mailbox_regs(const u8 *data, u8 start, u8 count) |
| { |
| if (start + count >= NUM_REGISTERS) { |
| printk(BIOS_ERR, "%s: Invalid start or count argument.\n", __func__); |
| return CB_ERR_ARG; |
| } |
| |
| while (count--) { |
| __set_mailbox_register(start, *data); |
| data++; |
| start++; |
| } |
| |
| return CB_SUCCESS; |
| } |
| |
| static void ec_command(u8 cmd) |
| { |
| outb(0, MAILBOX_INDEX); |
| outb(cmd, MAILBOX_DATA); |
| wait_ec(); |
| } |
| |
| u8 mec5035_mouse_touchpad(u8 setting) |
| { |
| u8 buf[15] = {0}; |
| write_mailbox_regs(&setting, 2, 1); |
| ec_command(CMD_MOUSE_TP); |
| /* The vendor firmware reads 15 bytes starting at index 1, presumably |
| to get some sort of return code. Though I don't know for sure if |
| this is the case. Assume the first byte is the return code. */ |
| read_mailbox_regs(buf, 1, 15); |
| return buf[0]; |
| } |
| |
| void mec5035_early_init(void) |
| { |
| /* If this isn't sent the EC shuts down the system after about 15 |
| seconds, flashing a pattern on the keyboard LEDs corresponding |
| to "processor failure" according to Dell service manuals. */ |
| ec_command(CMD_CPU_OK); |
| } |
| |
| static void mec5035_init(struct device *dev) |
| { |
| /* Unconditionally use this argument for now as this setting |
| is probably the most sensible default out of the 3 choices. */ |
| mec5035_mouse_touchpad(TP_PS2_MOUSE); |
| |
| pc_keyboard_init(NO_AUX_DEVICE); |
| } |
| |
| static struct device_operations ops = { |
| .init = mec5035_init, |
| .read_resources = noop_read_resources, |
| .set_resources = noop_set_resources |
| }; |
| |
| static struct pnp_info pnp_dev_info[] = { |
| { NULL, 0, 0, 0, } |
| }; |
| |
| static void mec5035_enable(struct device *dev) |
| { |
| pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info); |
| } |
| |
| struct chip_operations ec_dell_mec5035_ops = { |
| CHIP_NAME("MEC5035 EC") |
| .enable_dev = mec5035_enable, |
| }; |