Add beep for x86 chormeos.

Implement the VbExBeep function so that the DEV screen can beep.
Much of this code was coppied from coreboot.

BUG=chrome-os-partner:7114
TEST=manual, check that Stumpy beeps on DEV screen timeout and when
booting from USB with dev_boot_usb=0.

Change-Id: Icd4eabb0b10cc3d226db71e6a2b52d3ed7eb25ef
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/13110
Reviewed-by: Stefan Reinauer <reinauer@chromium.org>

2 files changed, 146 insertions, 0 deletions

diff --git a/board/chromebook-x86/chromeos/Makefile b/board/chromebook-x86/chromeos/Makefile
index a3eb6ec90f..c1e8f71ce0 100644
--- a/board/chromebook-x86/chromeos/Makefile
+++ b/board/chromebook-x86/chromeos/Makefile
@@ -40,6 +40,7 @@ LIB	= $(obj)libchromeos_board.a
 
 COBJS-$(CONFIG_CHROMEOS) += cros_gpio.o
 COBJS-$(CONFIG_CHROMEOS) += power_management.o
+COBJS-$(CONFIG_CHROMEOS) += hda_codec.o
 
 COBJS	:= $(COBJS-y)
 OBJS	:= $(addprefix $(obj),$(COBJS))
diff --git a/board/chromebook-x86/chromeos/hda_codec.c b/board/chromebook-x86/chromeos/hda_codec.c
new file mode 100644
index 0000000000..21a0db5a56
--- /dev/null
+++ b/board/chromebook-x86/chromeos/hda_codec.c
@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2011 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.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ */
+
+/* Implementation of per-board codec beeping */
+
+#include <chromeos/hda_codec.h>
+#include <common.h>
+#include <asm/global_data.h>
+#include <asm/io.h>
+#include <pci.h>
+
+#define HDA_CMD_REG 0x5C
+#define HDA_ICII_REG 0x64
+#define   HDA_ICII_BUSY (1 << 0)
+#define   HDA_ICII_VALID  (1 << 1)
+
+/**
+ *  Wait 50usec for the codec to indicate it is ready
+ *  no response would imply that the codec is non-operative
+ */
+static int wait_for_ready(uint32_t base)
+{
+	/* Use a 50 usec timeout - the Linux kernel uses the
+	 * same duration
+	 */
+
+	int timeout = 50;
+
+	while (timeout--) {
+		uint32_t reg32 = readl(base +  HDA_ICII_REG);
+		asm("" ::: "memory");
+		if (!(reg32 & HDA_ICII_BUSY))
+			return 0;
+		udelay(1);
+	}
+
+	return -1;
+}
+
+/**
+ *  Wait 50usec for the codec to indicate that it accepted
+ *  the previous command.  No response would imply that the code
+ *  is non-operative
+ */
+static int wait_for_valid(uint32_t base)
+{
+	uint32_t reg32;
+
+	/* Send the verb to the codec */
+	reg32 = readl(base + HDA_ICII_REG);
+	reg32 |= HDA_ICII_BUSY | HDA_ICII_VALID;
+	writel(reg32, base + HDA_ICII_REG);
+
+	/* Use a 50 usec timeout - the Linux kernel uses the
+	 * same duration
+	 */
+
+	int timeout = 50;
+	while (timeout--) {
+		reg32 = readl(base + HDA_ICII_REG);
+		if ((reg32 & (HDA_ICII_VALID | HDA_ICII_BUSY)) ==
+				HDA_ICII_VALID)
+			return 0;
+		udelay(1);
+	}
+
+	return -1;
+}
+
+/* Wait for the codec to be ready, write the verb, then wait for the
+ * codec to be valid.
+ */
+int write_one_verb(uint32_t base, uint32_t val)
+{
+	if (wait_for_ready(base) == -1)
+		return -1;
+
+	writel(val, base + HDA_CMD_REG);
+
+	if (wait_for_valid(base) == -1)
+		return -1;
+
+	return 0;
+}
+
+/* Supported sound devices.
+ */
+static struct pci_device_id supported[] = {
+	{PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_COUGARPOINT_HDA},
+	{}
+};
+
+/* Find the base address to talk tot he HDA codec.
+ */
+static u32 get_hda_base(void)
+{
+	pci_dev_t devbusfn;
+	u32 pci_mem_base;
+
+	devbusfn = pci_find_devices(supported, 0);
+	if (devbusfn < 0) {
+		printf("Audio: Controller not found !\n");
+		return 0;
+	}
+
+	pci_read_config_dword(devbusfn, PCI_BASE_ADDRESS_0, &pci_mem_base);
+	pci_mem_base = pci_mem_to_phys(devbusfn, pci_mem_base);
+	return pci_mem_base;
+}
+
+static const u32 beep_cmd[] = {
+	0x00170500, /* power up codec */
+	0x00270500, /* power up DAC */
+	0x00670500, /* power up speaker */
+	0x00670740, /* enable speaker output */
+	0x0023B04B, /* set DAC gain */
+	0x00C70A0C, /* enable beep generator 1 kHz */
+};
+
+void enable_beep(void)
+{
+	uint32_t base;
+	int i;
+
+	base = get_hda_base();
+	for (i = 0; i < sizeof(beep_cmd)/sizeof(beep_cmd[0]); i++) {
+		if (write_one_verb(base, beep_cmd[i]))
+			return;
+	}
+}
+
+void disable_beep(void)
+{
+	uint32_t base;
+
+	base = get_hda_base();
+	write_one_verb(base, 0x00C70A00); /* Disable beep gen */
+}