src/ec/quanta/it8518/ec.c

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