src/ec/roda/it8518/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 <pc80/keyboard.h>
   7 #include <ec/acpi/ec.h>
   8 #include <delay.h>
   9
  10 #include "chip.h"
  11
  12 static void it8518_init(struct device *dev)
  13 {
  14         const struct ec_roda_it8518_config *const conf = dev->chip_info;
  15
  16         if (!dev->enabled)
  17                 return;
  18
  19         printk(BIOS_DEBUG, "Roda IT8518: Initializing keyboard.\n");
  20         pc_keyboard_init(NO_AUX_DEVICE);
  21
  22         if (conf && conf->cpuhot_limit) {
  23                 /* The EC may take very long for the first command on a
  24                    cold boot (~180ms witnessed). Since we need an incre-
  25                    dibly long timeout, we do this EC RAM write manually. */
  26                 int timeout = 50000;    /* 50,000 * 10us = 500ms */
  27                 send_ec_command(0x81);
  28                 while (ec_status() & EC_IBF && --timeout)
  29                         udelay(10);
  30                 send_ec_data(0xb2);
  31                 send_ec_data(conf->cpuhot_limit);
  32         }
  33 }
  34
  35 static struct device_operations ops = {
  36         .init             = it8518_init,
  37         .read_resources   = noop_read_resources,
  38         .set_resources    = noop_set_resources,
  39 };
  40
  41 static struct pnp_info pnp_dev_info[] = {
  42         { NULL, 0, 0, 0, }
  43 };
  44
  45 static void enable_dev(struct device *dev)
  46 {
  47         pnp_enable_devices(dev, &ops, ARRAY_SIZE(pnp_dev_info), pnp_dev_info);
  48 }
  49
  50 struct chip_operations ec_roda_it8518_ops = {
  51         .name = "Roda IT8518 EC",
  52         .enable_dev = enable_dev
  53 };