Angel Pons | 210a008 | 2020-04-02 23:48:24 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* This file is part of the coreboot project. */ |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 3 | |
Edward O'Callaghan | b57fef9 | 2014-06-17 20:13:08 +1000 | [diff] [blame] | 4 | #include <arch/io.h> |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 5 | #include <console/console.h> |
Edward O'Callaghan | b57fef9 | 2014-06-17 20:13:08 +1000 | [diff] [blame] | 6 | #include <delay.h> |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 7 | #include <device/device.h> |
| 8 | #include <device/pnp.h> |
Edward O'Callaghan | b57fef9 | 2014-06-17 20:13:08 +1000 | [diff] [blame] | 9 | #include <pc80/keyboard.h> |
Edward O'Callaghan | b57fef9 | 2014-06-17 20:13:08 +1000 | [diff] [blame] | 10 | |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 11 | #include "ec.h" |
| 12 | #include "chip.h" |
| 13 | |
| 14 | /* helper functions from drivers/pc80/keyboard.c */ |
| 15 | static int input_buffer_empty(u16 status_reg) |
| 16 | { |
| 17 | u32 timeout; |
Elyes HAOUAS | 2b010b8 | 2016-08-25 20:57:08 +0200 | [diff] [blame] | 18 | for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(status_reg) & KBD_IBF); |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 19 | timeout--) { |
Idwer Vollering | d26da9c | 2013-12-22 21:38:18 +0000 | [diff] [blame] | 20 | udelay(1000); |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 21 | } |
| 22 | |
| 23 | if (!timeout) { |
| 24 | printk(BIOS_WARNING, "EC-IT8518 Unexpected input buffer full\n"); |
| 25 | printk(BIOS_WARNING, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg)); |
| 26 | } |
| 27 | return !!timeout; |
| 28 | } |
| 29 | |
| 30 | |
| 31 | static int output_buffer_full(u16 status_reg) |
| 32 | { |
| 33 | u32 timeout; |
Elyes HAOUAS | 2b010b8 | 2016-08-25 20:57:08 +0200 | [diff] [blame] | 34 | for (timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(status_reg) |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 35 | & KBD_OBF) == 0); timeout--) { |
Idwer Vollering | d26da9c | 2013-12-22 21:38:18 +0000 | [diff] [blame] | 36 | udelay(1000); |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | if (!timeout) { |
| 40 | printk(BIOS_INFO, "EC-IT8518 output buffer result timeout\n"); |
| 41 | printk(BIOS_INFO, " Status (0x%x): 0x%x\n", status_reg, inb(status_reg)); |
| 42 | } |
| 43 | return !!timeout; |
| 44 | } |
| 45 | |
| 46 | |
| 47 | |
| 48 | /* The IT8518 60/64 EC registers are the same command/status IB/OB KBC pair. |
| 49 | * Check status from 64 port before each command. |
| 50 | * |
| 51 | * Ex. Get panel ID command C43/D77 |
| 52 | * Check IBF empty. Then Write 0x43(CMD) to 0x64 Port |
| 53 | * Check IBF empty. Then Write 0x77(DATA) to 0x60 Port |
| 54 | * Check OBF set. Then Get Data(0x03:panel ID) from 0x60 |
| 55 | * Different commands return may or may not respond and may have multiple |
| 56 | * bytes. Keep it simple for nor |
| 57 | */ |
| 58 | |
| 59 | u8 ec_kbc_read_ob(void) |
| 60 | { |
| 61 | if (!output_buffer_full(KBD_STATUS)) return 0; |
| 62 | return inb(KBD_DATA); |
| 63 | } |
| 64 | |
| 65 | void ec_kbc_write_cmd(u8 cmd) |
| 66 | { |
| 67 | if (!input_buffer_empty(KBD_STATUS)) return; |
| 68 | outb(cmd, KBD_COMMAND); |
| 69 | } |
| 70 | |
| 71 | void ec_kbc_write_ib(u8 data) |
| 72 | { |
| 73 | if (!input_buffer_empty(KBD_STATUS)) return; |
| 74 | outb(data, KBD_DATA); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | /* |
| 79 | * These functions are for accessing the IT8518 device RAM space via 0x66/0x68 |
| 80 | */ |
| 81 | |
| 82 | u8 ec_read_ob(void) |
| 83 | { |
| 84 | if (!output_buffer_full(EC_SC)) return 0; |
| 85 | return inb(EC_DATA); |
| 86 | } |
| 87 | |
| 88 | void ec_write_cmd(u8 cmd) |
| 89 | { |
| 90 | if (!input_buffer_empty(EC_SC)) return; |
| 91 | outb(cmd, EC_SC); |
| 92 | } |
| 93 | |
| 94 | void ec_write_ib(u8 data) |
| 95 | { |
| 96 | if (!input_buffer_empty(EC_SC)) return; |
| 97 | outb(data, EC_DATA); |
| 98 | } |
| 99 | |
| 100 | u8 ec_read(u16 addr) |
| 101 | { |
| 102 | ec_write_cmd(RD_EC); |
| 103 | ec_write_ib(addr); |
| 104 | return ec_read_ob(); |
| 105 | } |
| 106 | |
| 107 | void ec_write(u16 addr, u8 data) |
| 108 | { |
| 109 | ec_write_cmd(WR_EC); |
| 110 | ec_write_ib(addr); |
| 111 | ec_write_ib(data); |
| 112 | } |
| 113 | |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 114 | |
| 115 | u8 ec_it8518_get_event(void) |
| 116 | { |
| 117 | u8 cmd = 0; |
| 118 | u8 status = inb(EC_SC); |
Elyes HAOUAS | b933109 | 2016-09-05 19:55:34 +0200 | [diff] [blame] | 119 | if (status & SCI_EVT) { |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 120 | ec_write_cmd(QR_EC); |
| 121 | cmd = ec_read_ob(); |
Elyes HAOUAS | b933109 | 2016-09-05 19:55:34 +0200 | [diff] [blame] | 122 | } else if (status & SMI_EVT) { |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 123 | ec_kbc_write_cmd(EC_KBD_SMI_EVENT); |
| 124 | cmd = ec_kbc_read_ob(); |
| 125 | } |
| 126 | return cmd; |
| 127 | } |
| 128 | |
| 129 | void ec_it8518_enable_wake_events(void) |
| 130 | { |
| 131 | /* |
| 132 | * Set the bit in ECRAM that will enable the Lid switch as a wake source |
| 133 | */ |
| 134 | u8 reg8 = ec_read(EC_WAKE_SRC_ENABLE); |
| 135 | ec_write(EC_WAKE_SRC_ENABLE, reg8 | EC_LID_WAKE_ENABLE); |
| 136 | } |
| 137 | |
Edward O'Callaghan | 2c9d2cf | 2014-10-27 23:29:29 +1100 | [diff] [blame] | 138 | static void it8518_init(struct device *dev) |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 139 | { |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 140 | if (!dev->enabled) |
| 141 | return; |
| 142 | |
| 143 | printk(BIOS_DEBUG, "Quanta IT8518: Initializing keyboard.\n"); |
Timothy Pearson | 448e386 | 2015-11-24 14:12:01 -0600 | [diff] [blame] | 144 | pc_keyboard_init(NO_AUX_DEVICE); |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 145 | } |
| 146 | |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 147 | static struct device_operations ops = { |
| 148 | .init = it8518_init, |
Nico Huber | 2f8ba69 | 2020-04-05 14:05:24 +0200 | [diff] [blame] | 149 | .read_resources = noop_read_resources, |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 150 | }; |
| 151 | |
| 152 | static struct pnp_info pnp_dev_info[] = { |
Felix Held | 1d9199c | 2018-07-07 00:27:44 +0200 | [diff] [blame] | 153 | { NULL, 0, 0, 0, } |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 154 | }; |
| 155 | |
Edward O'Callaghan | 2c9d2cf | 2014-10-27 23:29:29 +1100 | [diff] [blame] | 156 | static void enable_dev(struct device *dev) |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 157 | { |
Felix Held | 1d9199c | 2018-07-07 00:27:44 +0200 | [diff] [blame] | 158 | pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info); |
Stefan Reinauer | 7e56855 | 2013-03-13 17:03:04 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | struct chip_operations ec_quanta_it8518_ops = { |
| 162 | CHIP_NAME("QUANTA IT8518 EC") |
| 163 | .enable_dev = enable_dev |
| 164 | }; |