soc/amd/picasso: Add audio processor

Add a driver that can properly configure the pads needed to run the
correct audio mode.  I2S requires the 48M oscillator enabled
regardless of an external connection.

Change-Id: I1137eae91aa28640ca3e9e2b2c58beed2cdb7e3c
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36117
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

src/soc/amd/picasso/Makefile.inc

@@ -72,6 +72,7 @@ ramstage-y += southbridge.c
 ramstage-y += northbridge.c
 ramstage-y += pmutil.c
 ramstage-y += reset.c
+ramstage-y += acp.c
 ramstage-y += sata.c
 ramstage-y += sm.c
 ramstage-y += smbus.c

src/soc/amd/picasso/acp.c

@@ -0,0 +1,72 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include "chip.h"
+#include <soc/acpi.h>
+#include <soc/pci_devs.h>
+#include <soc/northbridge.h>
+#include <soc/southbridge.h>
+#include <amdblocks/acpimmio.h>
+#include <commonlib/helpers.h>
+
+static void enable(struct device *dev)
+{
+	const struct soc_amd_picasso_config *cfg;
+	const struct device *nb_dev = pcidev_path_on_root(GNB_DEVFN);
+	struct resource *res;
+	uintptr_t bar;
+
+	pci_dev_enable_resources(dev);
+
+	/* Set the proper I2S_PIN_CONFIG state */
+	if (!nb_dev || !nb_dev->chip_info)
+		return;
+
+	cfg = nb_dev->chip_info;
+
+	res = dev->resource_list;
+	if (!res || !res->base) {
+		printk(BIOS_ERR, "Error, unable to configure pin in %s\n", __func__);
+		return;
+	}
+
+	bar = (uintptr_t)res->base;
+	write32((void *)(bar + ACP_I2S_PIN_CONFIG), cfg->acp_pin_cfg);
+
+	if (cfg->acp_pin_cfg == I2S_PINS_I2S_TDM)
+		sb_clk_output_48Mhz(); /* Internal connection to I2S */
+}
+
+static struct pci_operations lops_pci = {
+	.set_subsystem = pci_dev_set_subsystem,
+};
+
+static struct device_operations acp_ops = {
+	.read_resources = pci_dev_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = enable,
+	.ops_pci = &lops_pci,
+};
+
+static const struct pci_driver acp_driver __pci_driver = {
+	.ops = &acp_ops,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.device = PCI_DEVICD_ID_AMD_PCO_ACP,
+};

src/soc/amd/picasso/chip.h

@@ -36,6 +36,14 @@ struct soc_amd_picasso_config {
 	 */
 	u8 i2c_scl_reset;
 	struct dw_i2c_bus_config i2c[PICASSO_I2C_DEV_MAX];
+	enum {
+		I2S_PINS_MAX_HDA = 0,	/* HDA w/reset  3xSDI, SW w/Data0 */
+		I2S_PINS_MAX_MHDA = 1,	/* HDA no reset 3xSDI, SW w/Data0-1 */
+		I2S_PINS_MIN_HDA = 2,	/* HDA w/reset  1xSDI, SW w/Data0-2 */
+		I2S_PINS_MIN_MHDA = 3,	/* HDA no reset 1xSDI, SW w/Data0-3 */
+		I2S_PINS_I2S_TDM = 4,
+		I2S_PINS_UNCONF = 7,	/* All pads will be input mode */
+	} acp_pin_cfg;
 };
 
 typedef struct soc_amd_picasso_config config_t;

src/soc/amd/picasso/include/soc/northbridge.h

@@ -73,6 +73,9 @@
 #define D18F1_VGAEN		0xf4
 # define VGA_ADDR_ENABLE	(1 << 0)
 
+/* Bus A D0F5 - Audio Processor */
+#define ACP_I2S_PIN_CONFIG	0x1400	/* HDA, Soundwire, I2S */
+
 void amd_initcpuio(void);
 
 void domain_enable_resources(struct device *dev);