x86: broadwell: Add support for the ADSP

The Application Digital Signal Processor is used for sound processing with
broadwell. Add a driver to support this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 157 insertions, 0 deletions

diff --git a/arch/x86/cpu/broadwell/Makefile b/arch/x86/cpu/broadwell/Makefile
index a032861e57..d3785aabdf 100644
--- a/arch/x86/cpu/broadwell/Makefile
+++ b/arch/x86/cpu/broadwell/Makefile
@@ -2,6 +2,7 @@
 #
 # Copyright (c) 2016 Google, Inc
 
+obj-y += adsp.o
 obj-y += cpu.o
 obj-y += iobp.o
 obj-y += lpc.o
diff --git a/arch/x86/cpu/broadwell/adsp.c b/arch/x86/cpu/broadwell/adsp.c
new file mode 100644
index 0000000000..2ac8cea7c3
--- /dev/null
+++ b/arch/x86/cpu/broadwell/adsp.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Support for Intel Application Digital Signal Processor
+ *
+ * Copyright 2019 Google LLC
+ *
+ * Modified from coreboot file of the same name
+ */
+
+#define LOG_CATEGORY UCLASS_SYSCON
+
+#include <common.h>
+#include <dm.h>
+#include <pci.h>
+#include <asm/io.h>
+#include <asm/cpu.h>
+#include <asm/intel_regs.h>
+#include <asm/arch/adsp.h>
+#include <asm/arch/pch.h>
+#include <asm/arch/rcb.h>
+
+enum pci_type_t {
+	LYNX_POINT,
+	WILDCAT_POINT,
+};
+
+struct broadwell_adsp_priv {
+	bool adsp_d3_pg_enable;
+	bool adsp_sram_pg_enable;
+	bool sio_acpi_mode;
+};
+
+static int broadwell_adsp_probe(struct udevice *dev)
+{
+	struct broadwell_adsp_priv *priv = dev_get_priv(dev);
+	enum pci_type_t type;
+	u32 bar0, bar1;
+	u32 tmp32;
+
+	/* Find BAR0 and BAR1 */
+	bar0 = dm_pci_read_bar32(dev, 0);
+	if (!bar0)
+		return -EINVAL;
+	bar1 = dm_pci_read_bar32(dev, 1);
+	if (!bar1)
+		return -EINVAL;
+
+	/*
+	 * Set LTR value in DSP shim LTR control register to 3ms
+	 * SNOOP_REQ[13]=1b SNOOP_SCALE[12:10]=100b (1ms) SNOOP_VAL[9:0]=3h
+	 */
+	type = dev_get_driver_data(dev);
+	tmp32 = type == WILDCAT_POINT ? ADSP_SHIM_BASE_WPT : ADSP_SHIM_BASE_LPT;
+	writel(ADSP_SHIM_LTRC_VALUE, bar0 + tmp32);
+
+	/* Program VDRTCTL2 D19:F0:A8[31:0] = 0x00000fff */
+	dm_pci_write_config32(dev, ADSP_PCI_VDRTCTL2, ADSP_VDRTCTL2_VALUE);
+
+	/* Program ADSP IOBP VDLDAT1 to 0x040100 */
+	pch_iobp_write(ADSP_IOBP_VDLDAT1, ADSP_VDLDAT1_VALUE);
+
+	/* Set D3 Power Gating Enable in D19:F0:A0 based on PCH type */
+	dm_pci_read_config32(dev, ADSP_PCI_VDRTCTL0, &tmp32);
+	if (type == WILDCAT_POINT) {
+		if (priv->adsp_d3_pg_enable) {
+			tmp32 &= ~ADSP_VDRTCTL0_D3PGD_WPT;
+			if (priv->adsp_sram_pg_enable)
+				tmp32 &= ~ADSP_VDRTCTL0_D3SRAMPGD_WPT;
+			else
+				tmp32 |= ADSP_VDRTCTL0_D3SRAMPGD_WPT;
+		} else {
+			tmp32 |= ADSP_VDRTCTL0_D3PGD_WPT;
+		}
+	} else {
+		if (priv->adsp_d3_pg_enable) {
+			tmp32 &= ~ADSP_VDRTCTL0_D3PGD_LPT;
+			if (priv->adsp_sram_pg_enable)
+				tmp32 &= ~ADSP_VDRTCTL0_D3SRAMPGD_LPT;
+			else
+				tmp32 |= ADSP_VDRTCTL0_D3SRAMPGD_LPT;
+		} else {
+			tmp32 |= ADSP_VDRTCTL0_D3PGD_LPT;
+		}
+	}
+	dm_pci_write_config32(dev, ADSP_PCI_VDRTCTL0, tmp32);
+
+	/* Set PSF Snoop to SA, RCBA+0x3350[10]=1b */
+	setbits_le32(RCB_REG(0x3350), 1 << 10);
+
+	/* Set DSP IOBP PMCTL 0x1e0=0x3f */
+	pch_iobp_write(ADSP_IOBP_PMCTL, ADSP_PMCTL_VALUE);
+
+	if (priv->sio_acpi_mode) {
+		/* Configure for ACPI mode */
+		log_info("ADSP: Enable ACPI Mode IRQ3\n");
+
+		/* Set interrupt de-assert/assert opcode override to IRQ3 */
+		pch_iobp_write(ADSP_IOBP_VDLDAT2, ADSP_IOBP_ACPI_IRQ3);
+
+		/* Enable IRQ3 in RCBA */
+		setbits_le32(RCB_REG(ACPIIRQEN), ADSP_ACPI_IRQEN);
+
+		/* Set ACPI Interrupt Enable Bit */
+		pch_iobp_update(ADSP_IOBP_PCICFGCTL, ~ADSP_PCICFGCTL_SPCBAD,
+				ADSP_PCICFGCTL_ACPIIE);
+
+		/* Put ADSP in D3hot */
+		clrbits_le32(bar1 + PCH_PCS, PCH_PCS_PS_D3HOT);
+	} else {
+		log_info("ADSP: Enable PCI Mode IRQ23\n");
+
+		/* Configure for PCI mode */
+		dm_pci_write_config32(dev, PCI_INTERRUPT_LINE, ADSP_PCI_IRQ);
+
+		/* Clear ACPI Interrupt Enable Bit */
+		pch_iobp_update(ADSP_IOBP_PCICFGCTL,
+				~(ADSP_PCICFGCTL_SPCBAD |
+				 ADSP_PCICFGCTL_ACPIIE), 0);
+	}
+
+	return 0;
+}
+
+static int broadwell_adsp_ofdata_to_platdata(struct udevice *dev)
+{
+	struct broadwell_adsp_priv *priv = dev_get_priv(dev);
+
+	priv->adsp_d3_pg_enable = dev_read_bool(dev, "intel,adsp-d3-pg-enable");
+	priv->adsp_sram_pg_enable = dev_read_bool(dev,
+						  "intel,adsp-sram-pg-enable");
+	priv->sio_acpi_mode = dev_read_bool(dev, "intel,sio-acpi-mode");
+
+	return 0;
+}
+
+static const struct udevice_id broadwell_adsp_ids[] = {
+	{ .compatible = "intel,wildcatpoint-adsp", .data = WILDCAT_POINT },
+	{ }
+};
+
+U_BOOT_DRIVER(broadwell_adsp_drv) = {
+	.name		= "adsp",
+	.id		= UCLASS_SYSCON,
+	.ofdata_to_platdata	= broadwell_adsp_ofdata_to_platdata,
+	.of_match	= broadwell_adsp_ids,
+	.bind           = dm_scan_fdt_dev,
+	.probe		= broadwell_adsp_probe,
+};
+
+static struct pci_device_id broadwell_adsp_supported[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL,
+		PCI_DEVICE_ID_INTEL_WILDCATPOINT_ADSP) },
+	{ },
+};
+
+U_BOOT_PCI_DEVICE(broadwell_adsp_drv, broadwell_adsp_supported);