Move ACPI stuff out of chip/lm4 and into common

The port 62/66 ACPI commands were implemented in chip/lm4/lpc.c. They should
be handled in common instead of being tied to a particular EC.

BUG=chrome-os-partner:23774
BRANCH=none
TEST=manual

read EC_ACPI_MEM_VERSION

  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 0; iotools io_read8 0x62
  0x01

write & read EC_ACPI_MEM_TEST

  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 1; iotools io_write8 0x62 0xa5
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 1; iotools io_read8 0x62
  0xa5
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 2; iotools io_read8 0x62
  0x5a

  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 1; iotools io_write8 0x62 0xbb
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 1; iotools io_read8 0x62
  0xbb
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 2; iotools io_read8 0x62
  0x44

read & write EC_ACPI_MEM_KEYBOARD_BACKLIGHT

  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 3; iotools io_write8 0x62 100
  (keyboard lights up)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 3; iotools io_read8 0x62
  0x64
  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 3; iotools io_write8 0x62 50
  (keyboard dimmer)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 3; iotools io_read8 0x62
  0x32
  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 3; iotools io_write8 0x62 0
  (keyboard goes dark)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 3; iotools io_read8 0x62
  0x00

read & write EC_ACPI_MEM_FAN_DUTY

  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 4; iotools io_write8 0x62 100
  (fan on full)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 4; iotools io_read8 0x62
  0x64
  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 4; iotools io_write8 0x62 50
  (fan on half speed)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 4; iotools io_read8 0x62
  0x32
  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 4; iotools io_write8 0x62 0
  (fan off)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 4; iotools io_read8 0x62
  0x00
  # iotools io_write8 0x66 0x81; iotools io_write8 0x62 4; iotools io_write8 0x62 0xff
  (fan back to EC control)
  # iotools io_write8 0x66 0x80; iotools io_write8 0x62 4; iotools io_read8 0x62
  0xff

test EC_CMD_ACPI_QUERY_EVENT

  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x00

  On EC console:
  > hostevent set 0x0f000000

  # ectool eventget
  Current host events: 0x0f000000

  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x19
  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x1a
  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x1b
  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x1c
  # iotools io_write8 0x66 0x84; iotools io_read8 0x62
  0x00

  # ectool eventget
  Current host events: 0x00000000

Change-Id: I011a5a2051171ec1d37e55ce03e1ce74b93a7e14
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/179692

1 files changed, 132 insertions, 0 deletions

diff --git a/common/acpi.c b/common/acpi.c
new file mode 100644
index 0000000000..942dd21dd2
--- /dev/null
+++ b/common/acpi.c
@@ -0,0 +1,132 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "acpi.h"
+#include "common.h"
+#include "console.h"
+#include "dptf.h"
+#include "lpc.h"
+#include "ec_commands.h"
+#include "pwm.h"
+
+/* Console output macros */
+#define CPUTS(outstr) cputs(CC_LPC, outstr)
+#define CPRINTF(format, args...) cprintf(CC_LPC, format, ## args)
+
+static uint8_t acpi_cmd;         /* Last received ACPI command */
+static uint8_t acpi_addr;        /* First byte of data after ACPI command */
+static int acpi_data_count;      /* Number of data writes after command */
+static uint8_t acpi_mem_test;    /* Test byte in ACPI memory space */
+
+/* This handles AP writes to the EC via the ACPI I/O port. There are only a few
+ * ACPI commands (EC_CMD_ACPI_*), but they are all handled here.
+ */
+int acpi_ap_to_ec(int is_cmd, uint8_t value, uint8_t *resultptr)
+{
+	int data = 0;
+	int retval = 0;
+
+	CPRINTF("[HEY: %T %s(%d, 0x%x)]\n", is_cmd, value);
+
+	/* Read command/data; this clears the FRMH status bit. */
+	if (is_cmd) {
+		acpi_cmd = value;
+		acpi_data_count = 0;
+	} else {
+		data = value;
+		/*
+		 * The first data byte is the ACPI memory address for
+		 * read/write commands.
+		 */
+		if (!acpi_data_count++)
+			acpi_addr = data;
+	}
+
+	/* Process complete commands */
+	if (acpi_cmd == EC_CMD_ACPI_READ && acpi_data_count == 1) {
+		/* ACPI read cmd + addr */
+		int result = 0xff;		/* value for bogus read */
+
+		switch (acpi_addr) {
+		case EC_ACPI_MEM_VERSION:
+			result = EC_ACPI_MEM_VERSION_CURRENT;
+			break;
+		case EC_ACPI_MEM_TEST:
+			result = acpi_mem_test;
+			break;
+		case EC_ACPI_MEM_TEST_COMPLIMENT:
+			result = 0xff - acpi_mem_test;
+			break;
+#ifdef CONFIG_PWM_KBLIGHT
+		case EC_ACPI_MEM_KEYBOARD_BACKLIGHT:
+			/*
+			 * TODO(crosbug.com/p/23774): not very satisfying that
+			 * LPC knows directly about the keyboard backlight, but
+			 * for now this is good enough and less code than
+			 * defining a new API for ACPI commands.  If we start
+			 * adding more commands, or need to support LPC on more
+			 * than just LM4, fix this.
+			 */
+			result = pwm_get_duty(PWM_CH_KBLIGHT);
+			break;
+#endif
+#ifdef CONFIG_FANS
+		case EC_ACPI_MEM_FAN_DUTY:
+			/** TODO(crosbug.com/p/23774): Fix this too */
+			result = dptf_get_fan_duty_target();
+			break;
+#endif
+		default:
+			break;
+		}
+
+		/* Send the result byte */
+		CPRINTF("[%T ACPI read 0x%02x = 0x%02x]\n", acpi_addr, result);
+		*resultptr = result;
+		retval = 1;
+
+	} else if (acpi_cmd == EC_CMD_ACPI_WRITE && acpi_data_count == 2) {
+		/* ACPI write cmd + addr + data */
+		switch (acpi_addr) {
+		case EC_ACPI_MEM_TEST:
+			CPRINTF("[%T ACPI mem test 0x%02x]\n", data);
+			acpi_mem_test = data;
+			break;
+#ifdef CONFIG_PWM_KBLIGHT
+		case EC_ACPI_MEM_KEYBOARD_BACKLIGHT:
+			/*
+			 * Debug output with CR not newline, because the host
+			 * does a lot of keyboard backlights and it scrolls the
+			 * debug console.
+			 */
+			CPRINTF("\r[%T ACPI kblight %d]", data);
+			pwm_set_duty(PWM_CH_KBLIGHT, data);
+			break;
+#endif
+#ifdef CONFIG_FANS
+		case EC_ACPI_MEM_FAN_DUTY:
+			/** TODO(crosbug.com/p/23774): Fix this too */
+			dptf_set_fan_duty_target(data);
+			break;
+#endif
+		default:
+			CPRINTF("[%T ACPI write 0x%02x = 0x%02x]\n",
+				acpi_addr, data);
+			break;
+		}
+
+/* At the moment, ACPI implies LPC. */
+#ifdef CONFIG_LPC
+	} else if (acpi_cmd == EC_CMD_ACPI_QUERY_EVENT && !acpi_data_count) {
+		/* Clear and return the lowest host event */
+		int evt_index = lpc_query_host_event_state();
+		CPRINTF("[%T ACPI query = %d]\n", evt_index);
+		*resultptr = evt_index;
+		retval = 1;
+#endif
+	}
+
+	return retval;
+}