src/ec/compal/ene932/ec.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <device/device.h>
   5 #include <device/pnp.h>
   6 #include <arch/io.h>
   7 #include <delay.h>
   8 #include <pc80/keyboard.h>
   9 #include "ec.h"
  10 #include "chip.h"
  11
  12 /* kbc helper functions from drivers/pc80/keyboard.c. TODO: share functions. */
  13 static int kbc_input_buffer_empty(void)
  14 {
  15         u32 timeout;
  16         for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS) & KBD_IBF);
  17             timeout--) {
  18                 mdelay(1);
  19         }
  20
  21         if (!timeout) {
  22                 printk(BIOS_WARNING,
  23                        "Unexpected Keyboard controller input buffer full\n");
  24         }
  25         return !!timeout;
  26 }
  27
  28 static int kbc_output_buffer_full(void)
  29 {
  30         u32 timeout;
  31         for (timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(KBD_STATUS)
  32             & KBD_OBF) == 0); timeout--) {
  33                 mdelay(1);
  34         }
  35
  36         if (!timeout) {
  37                 printk(BIOS_INFO, "Keyboard controller output buffer result timeout\n");
  38         }
  39         return !!timeout;
  40 }
  41
  42 int kbc_cleanup_buffers(void)
  43 {
  44         u32 timeout;
  45         for (timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS)
  46             & (KBD_OBF | KBD_IBF)); timeout--) {
  47                 mdelay(1);
  48                 inb(KBD_DATA);
  49         }
  50
  51         if (!timeout) {
  52                 printk(BIOS_ERR, "Couldn't cleanup the keyboard controller buffers\n");
  53                 printk(BIOS_ERR, "Status (0x%x): 0x%x, Buffer (0x%x): 0x%x\n",
  54                                 KBD_STATUS, inb(KBD_STATUS), KBD_DATA, inb(KBD_DATA));
  55         }
  56
  57         return !!timeout;
  58 }
  59
  60 /* The ENE 60/64 EC registers are the same command/status IB/OB KBC pair.
  61  * Check status from 64 port before each command.
  62  *
  63  *  Ex. Get panel ID command C43/D77
  64  *  Check IBF empty. Then Write 0x43(CMD) to 0x64 Port
  65  *  Check IBF empty. Then Write 0x77(DATA) to 0x60 Port
  66  *  Check OBF set. Then Get Data(0x03:panel ID) from 0x60
  67  * Different commands return may or may not respond and may have multiple
  68  * bytes. Keep it simple for nor
  69  */
  70
  71 u8 ec_kbc_read_ob(void)
  72 {
  73         if (!kbc_output_buffer_full()) return 0;
  74         return inb(KBD_DATA);
  75 }
  76
  77 void ec_kbc_write_cmd(u8 cmd)
  78 {
  79         if (!kbc_input_buffer_empty()) return;
  80         outb(cmd, KBD_COMMAND);
  81 }
  82
  83 void ec_kbc_write_ib(u8 data)
  84 {
  85         if (!kbc_input_buffer_empty()) return;
  86         outb(data, KBD_DATA);
  87 }
  88
  89 /*
  90  * These functions are for accessing the ENE932 device space, but are not
  91  * currently used.
  92  */
  93 /*
  94 static u8 ec_io_read(u16 addr)
  95 {
  96         outb(addr >> 8, EC_IO_HIGH);
  97         outb(addr & 0xff, EC_IO_LOW);
  98         return inb(EC_IO_DATA);
  99 }
 100 */
 101 /*static void ec_write(u16 addr, u8 data)
 102 {
 103         outb(addr >> 8, EC_IO_HIGH);
 104         outb(addr & 0xff, EC_IO_LOW;
 105         outb(data, EC_IO_DATA);
 106 }
 107 */
 108
 109 static void ene932_init(struct device *dev)
 110 {
 111         if (!dev->enabled)
 112                 return;
 113
 114         printk(BIOS_DEBUG, "Compal ENE932: Initializing keyboard.\n");
 115         pc_keyboard_init(NO_AUX_DEVICE);
 116 }
 117
 118 static struct device_operations ops = {
 119         .init             = ene932_init,
 120         .read_resources   = noop_read_resources,
 121         .set_resources    = noop_set_resources,
 122 };
 123
 124 static struct pnp_info pnp_dev_info[] = {
 125         { NULL, 0, 0, 0, }
 126 };
 127
 128 static void enable_dev(struct device *dev)
 129 {
 130         pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
 131 }
 132
 133 struct chip_operations ec_compal_ene932_ops = {
 134         CHIP_NAME("COMPAL ENE932 EC")
 135         .enable_dev = enable_dev
 136 };