qcs405: Add support for USB host mode

Add required changes for USB host mode for
USB disk enumeration.

TEST=build & run

Change-Id: I35ec549b49b9789389c80843f6103e7243d52aac
Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@partner-android.googlesource.com>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/29966
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/soc/qualcomm/qcs405/Makefile.inc

@@ -21,6 +21,7 @@ romstage-y += spi.c
 romstage-y += cbmem.c
 romstage-y += gpio.c
 romstage-y += clock.c
+romstage-y += usb.c
 
 ################################################################################
 ramstage-y += soc.c
@@ -29,6 +30,7 @@ ramstage-y += spi.c
 ramstage-y += cbmem.c
 ramstage-y += gpio.c
 ramstage-y += clock.c
+ramstage-y += usb.c
 
 ################################################################################
 

src/soc/qualcomm/qcs405/include/soc/clock.h

@@ -26,10 +26,10 @@
 /**
  *    USB BCR registers
  */
-#define GCC_USB_HS_PHY_CFG_AHB_BCR	0x1841038
+#define GCC_USB_HS_PHY_CFG_AHB_BCR	0x180000C
 #define GCC_USB_HS_BCR			0x1841000
 #define GCC_USB_30_BCR			0x1839000
-#define GCC_USB2A_PHY_BCR		0x1841028
+#define GCC_USB2A_PHY_BCR		0x180000C
 #define GCC_USB2_HS_PHY_ONLY_BCR	0x1841034
 #define GCC_QUSB2_PHY_BCR		0x184103C
 

src/soc/qualcomm/qcs405/include/soc/usb.h

@@ -0,0 +1,78 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (c) 2018 Qualcomm Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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 <types.h>
+
+#ifndef _QCS405_USB_H_
+#define _QCS405_USB_H_
+
+/* QSCRATCH_GENERAL_CFG register bit offset */
+#define PIPE_UTMI_CLK_SEL			BIT(0)
+#define PIPE3_PHYSTATUS_SW			BIT(3)
+#define PIPE_UTMI_CLK_DIS			BIT(8)
+
+/* Global USB3 Control  Registers */
+#define DWC3_GUSB3PIPECTL_DELAYP1TRANS		BIT(18)
+#define DWC3_GUSB3PIPECTL_UX_EXIT_IN_PX		BIT(27)
+#define DWC3_GCTL_PRTCAPDIR(n)			((n) << 12)
+#define DWC3_GCTL_PRTCAP_OTG			3
+#define DWC3_GCTL_PRTCAP_HOST			1
+
+/* Global USB2 PHY Configuration Register */
+#define DWC3_GUSB2PHYCFG_USBTRDTIM(n)		((n) << 10)
+#define DWC3_GUSB2PHYCFG_USB2TRDTIM_MASK	DWC3_GUSB2PHYCFG_USBTRDTIM(0xf)
+#define DWC3_GUSB2PHYCFG_PHYIF(n)		((n) << 3)
+#define DWC3_GUSB2PHYCFG_PHYIF_MASK		DWC3_GUSB2PHYCFG_PHYIF(1)
+#define USBTRDTIM_UTMI_8_BIT			9
+#define UTMI_PHYIF_8_BIT			0
+
+#define DWC3_GCTL_SCALEDOWN(n)			((n) << 4)
+#define DWC3_GCTL_SCALEDOWN_MASK		DWC3_GCTL_SCALEDOWN(3)
+#define DWC3_GCTL_DISSCRAMBLE			(1 << 3)
+#define DWC3_GCTL_U2EXIT_LFPS			(1 << 2)
+#define DWC3_GCTL_DSBLCLKGTNG			(1 << 0)
+
+/* USB2 PHY register values */
+#define USB2PHY_TCSR_CTRL			0x01
+#define USB2PHY_REFCLK_CTRL			0x0d
+#define USB2PHY_UTMI_CTRL5			0x12
+#define USB2PHY_PARAMETER_OVERRIDE_X0		0x63
+#define USB2PHY_PARAMETER_OVERRIDE_X1		0x03
+#define USB2PHY_PARAMETER_OVERRIDE_X2		0x1d
+#define USB2PHY_PARAMETER_OVERRIDE_X3		0x03
+#define USB2PHY_HS_PHY_CTRL1			0x23
+#define QUSB2PHY_HS_PHY_CTRL_COMMON0		0x08
+#define QUSB2PHY_HS_PHY_CTRL_COMMON1		0xdc
+#define USB2PHY_HS_PHY_CTRL2			0xe0
+#define USB2PHY_UTMI_CTRL5_POR_CLEAR		0x10
+#define USB2PHY_HS_PHY_CTRL2_SUSPEND_N_SEL	0x60
+
+struct usb_board_data {
+	/* Register values going to override from the boardfile */
+	u8 parameter_override_x0;
+	u8 parameter_override_x1;
+	u8 parameter_override_x2;
+	u8 parameter_override_x3;
+};
+
+enum usb_port {
+	HSUSB_SS_PORT_0,
+	HSUSB_HS_PORT_1,
+};
+
+void setup_usb_host(enum usb_port port, struct usb_board_data *data);
+/* Call reset_ before setup_ */
+void reset_usb(enum usb_port port);
+
+#endif /* _QCS405_USB_H_ */

src/soc/qualcomm/qcs405/usb.c

@@ -0,0 +1,269 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (c) 2018 Qualcomm Technologies
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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 <device/mmio.h>
+#include <lib.h>
+#include <stdlib.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/usb.h>
+#include <soc/clock.h>
+#include <timer.h>
+
+/* USB BASE ADDRESS */
+#define USB_HOST0_DWC3_BASE		0x758C100
+#define USB3_USB30_QSCRATCH_BASE	0x7678800
+#define USB2_FEMTO_PHY_PRI_BASE		0x007A000
+#define USB_HOST1_DWC3_BASE		0x78CC100
+#define USB2_USB30_QSCRATCH_BASE	0x79B8800
+#define USB2_FEMTO_PHY_SEC_BASE		0x007C000
+
+struct usb_qscratch {
+	u8 rsvd0[8];
+	u32 *qscratch_cfg_reg;
+
+};
+check_member(usb_qscratch, qscratch_cfg_reg, 0x08);
+
+struct usb_usb2_phy_dig {
+	u8 rsvd1[116];
+	u32 utmi_ctrl5;
+	u32 ctrl_common0;
+	u32 ctrl_common1;
+	u8 rsvd2[12];
+	u32 phy_ctrl1;
+	u32 phy_ctrl2;
+	u8 rsvd3;
+	u32 override_x0;
+	u32 override_x1;
+	u32 override_x2;
+	u32 override_x3;
+	u8 rsvd4[24];
+	u32 tcsr_ctrl;
+	u8 rsvd5[36];
+	u32 refclk_ctrl;
+};
+check_member(usb_usb2_phy_dig, utmi_ctrl5, 0x74);
+check_member(usb_usb2_phy_dig, phy_ctrl1, 0x8C);
+check_member(usb_usb2_phy_dig, override_x0, 0x98);
+check_member(usb_usb2_phy_dig, tcsr_ctrl, 0xC0);
+check_member(usb_usb2_phy_dig, refclk_ctrl, 0xE8);
+
+struct usb_dwc3 {
+	u32 sbuscfg0;
+	u32 sbuscfg1;
+	u32 txthrcfg;
+	u32 rxthrcfg;
+	u32 ctl;
+	u32 pmsts;
+	u32 sts;
+	u32 uctl1;
+	u32 snpsid;
+	u32 gpio;
+	u32 uid;
+	u32 uctl;
+	u64 buserraddr;
+	u64 prtbimap;
+	u8 reserved1[32];
+	u32 dbgfifospace;
+	u32 dbgltssm;
+	u32 dbglnmcc;
+	u32 dbgbmu;
+	u32 dbglspmux;
+	u32 dbglsp;
+	u32 dbgepinfo0;
+	u32 dbgepinfo1;
+	u64 prtbimap_hs;
+	u64 prtbimap_fs;
+	u8 reserved2[112];
+	u32 usb2phycfg;
+	u8 reserved3[60];
+	u32 usb2i2cctl;
+	u8 reserved4[60];
+	u32 usb2phyacc;
+	u8 reserved5[60];
+	u32 usb3pipectl;
+	u8 reserved6[60];
+};
+check_member(usb_dwc3, usb3pipectl, 0x1c0);
+
+struct usb_dwc3_cfg {
+	struct usb_dwc3 *usb_host_dwc3;
+	struct usb_usb2_phy_dig *usb2_phy_dig;
+	struct usb_qscratch *usb_qscratch_reg;
+	u32 *usb2_phy_bcr;
+	u32 *usb2_phy_por_bcr;
+	u32 *usb3_bcr;
+	struct usb_board_data *board_data;
+};
+
+static struct usb_dwc3_cfg usb_host_base[2] = {
+	[HSUSB_SS_PORT_0] = {
+	.usb_host_dwc3 =	(void *)USB_HOST0_DWC3_BASE,
+	.usb2_phy_dig  =	(void *)USB2_FEMTO_PHY_PRI_BASE,
+	.usb2_phy_bcr =		(void *)GCC_USB_HS_PHY_CFG_AHB_BCR,
+	.usb2_phy_por_bcr =	(void *)GCC_USB2A_PHY_BCR,
+	.usb3_bcr =		(void *)GCC_USB_30_BCR,
+	.usb_qscratch_reg =	(void *)USB3_USB30_QSCRATCH_BASE,
+	},
+	[HSUSB_HS_PORT_1] = {
+	.usb_host_dwc3 =	(void *)USB_HOST1_DWC3_BASE,
+	.usb2_phy_dig  =	(void *)USB2_FEMTO_PHY_SEC_BASE,
+	.usb2_phy_bcr =		(void *)GCC_QUSB2_PHY_BCR,
+	.usb2_phy_por_bcr =	(void *)GCC_USB2_HS_PHY_ONLY_BCR,
+	.usb3_bcr =		(void *)GCC_USB_HS_BCR,
+	.usb_qscratch_reg =	(void *)USB2_USB30_QSCRATCH_BASE,
+	},
+};
+
+void reset_usb(enum usb_port port)
+{
+	struct usb_dwc3_cfg *dwc3 = &usb_host_base[port];
+
+	/* Put Core in Reset */
+	printk(BIOS_INFO, "Starting DWC3 reset for USB%d\n", port);
+
+	/* Assert Core reset */
+	clock_reset_bcr(dwc3->usb3_bcr, 1);
+}
+
+static void usb2_phy_override_phy_params(struct usb_dwc3_cfg *dwc3)
+{
+	/* Override disconnect & squelch threshold values */
+	write8(&dwc3->usb2_phy_dig->override_x0,
+			dwc3->board_data->parameter_override_x0);
+
+	/* Override HS transmitter Pre-emphasis values */
+	write8(&dwc3->usb2_phy_dig->override_x1,
+			dwc3->board_data->parameter_override_x1);
+
+	/* Override HS transmitter Rise/Fall time values */
+	write8(&dwc3->usb2_phy_dig->override_x2,
+			dwc3->board_data->parameter_override_x2);
+
+	/* Override FS/LS Source impedance values */
+	write8(&dwc3->usb2_phy_dig->override_x3,
+			dwc3->board_data->parameter_override_x3);
+}
+
+static void hs_usb_phy_init(struct usb_dwc3_cfg *dwc3)
+{
+	write8(&dwc3->usb2_phy_dig->tcsr_ctrl, USB2PHY_TCSR_CTRL);
+	write8(&dwc3->usb2_phy_dig->refclk_ctrl, USB2PHY_REFCLK_CTRL);
+	write8(&dwc3->usb2_phy_dig->utmi_ctrl5, USB2PHY_UTMI_CTRL5);
+	write8(&dwc3->usb2_phy_dig->override_x0, USB2PHY_PARAMETER_OVERRIDE_X0);
+	write8(&dwc3->usb2_phy_dig->override_x1, USB2PHY_PARAMETER_OVERRIDE_X1);
+	write8(&dwc3->usb2_phy_dig->override_x2, USB2PHY_PARAMETER_OVERRIDE_X2);
+	write8(&dwc3->usb2_phy_dig->override_x3, USB2PHY_PARAMETER_OVERRIDE_X3);
+
+	if (dwc3->board_data)
+		/* Override board specific PHY tuning values */
+		usb2_phy_override_phy_params(dwc3);
+
+	write8(&dwc3->usb2_phy_dig->phy_ctrl1, USB2PHY_HS_PHY_CTRL1);
+	write8(&dwc3->usb2_phy_dig->ctrl_common0, QUSB2PHY_HS_PHY_CTRL_COMMON0);
+	write8(&dwc3->usb2_phy_dig->ctrl_common1, QUSB2PHY_HS_PHY_CTRL_COMMON1);
+	write8(&dwc3->usb2_phy_dig->phy_ctrl2, USB2PHY_HS_PHY_CTRL2);
+	udelay(20);
+	write8(&dwc3->usb2_phy_dig->utmi_ctrl5, USB2PHY_UTMI_CTRL5_POR_CLEAR);
+	write8(&dwc3->usb2_phy_dig->phy_ctrl2,
+					USB2PHY_HS_PHY_CTRL2_SUSPEND_N_SEL);
+}
+
+static void setup_dwc3(struct usb_dwc3 *dwc3)
+{
+	/* core exits U1/U2/U3 only in PHY power state P1/P2/P3 respectively */
+	clrsetbits_le32(&dwc3->usb3pipectl,
+		DWC3_GUSB3PIPECTL_DELAYP1TRANS,
+		DWC3_GUSB3PIPECTL_UX_EXIT_IN_PX);
+
+	clrsetbits_le32(&dwc3->ctl, (DWC3_GCTL_SCALEDOWN_MASK |
+			DWC3_GCTL_DISSCRAMBLE),
+			DWC3_GCTL_U2EXIT_LFPS | DWC3_GCTL_DSBLCLKGTNG);
+
+	/* configure controller in Host mode */
+	clrsetbits_le32(&dwc3->ctl, (DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG)),
+			DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_HOST));
+	printk(BIOS_INFO, "Configure USB in Host mode\n");
+}
+
+/* Initialization of DWC3 Core and PHY */
+void setup_usb_host(enum usb_port port, struct usb_board_data *board_data)
+{
+	struct usb_dwc3_cfg *dwc3 = &usb_host_base[port];
+	u32 val;
+
+	printk(BIOS_INFO, "Setting up USB HOST%d controller.\n", port);
+
+	dwc3->board_data = board_data;
+
+	 /* Clear core reset. */
+	clock_reset_bcr(dwc3->usb3_bcr, 0);
+
+
+	if (port == HSUSB_SS_PORT_0) {
+		/* Set PHY reset. */
+		setbits_le32(&dwc3->usb2_phy_bcr, BIT(1));
+		udelay(15);
+		/* Clear PHY reset. */
+		clrbits_le32(&dwc3->usb2_phy_bcr, BIT(1));
+	} else {
+		clock_reset_bcr(dwc3->usb2_phy_bcr, 1);
+		udelay(15);
+		clock_reset_bcr(dwc3->usb2_phy_bcr, 0);
+	}
+	udelay(100);
+
+	/* Initialize PHYs */
+	hs_usb_phy_init(dwc3);
+
+	if (port == HSUSB_SS_PORT_0) {
+		/* Set PHY POR reset. */
+		setbits_le32(&dwc3->usb2_phy_por_bcr, BIT(0));
+		val = read8(&dwc3->usb2_phy_dig->ctrl_common0);
+		val &= ~(0x4);
+		write8(&dwc3->usb2_phy_dig->ctrl_common0, val);
+		udelay(20);
+		/* Clear PHY POR reset. */
+		clrbits_le32(&dwc3->usb2_phy_por_bcr, BIT(0));
+	} else {
+		clock_reset_bcr(dwc3->usb2_phy_por_bcr, 1);
+		val = read8(&dwc3->usb2_phy_dig->ctrl_common0);
+		val &= ~(0x4);
+		write8(&dwc3->usb2_phy_dig->ctrl_common0, val);
+		udelay(20);
+		clock_reset_bcr(dwc3->usb2_phy_por_bcr, 0);
+	}
+	udelay(100);
+
+	setup_dwc3(dwc3->usb_host_dwc3);
+
+	/*
+	 * Below sequence is used when dwc3 operates without
+	 * SSPHY and only HS/FS/LS modes are supported.
+	 */
+
+	 /* Configure dwc3 to use UTMI clock as PIPE clock not present */
+	setbits_le32(&dwc3->usb_qscratch_reg->qscratch_cfg_reg,
+			PIPE_UTMI_CLK_DIS);
+	udelay(2);
+	setbits_le32(&dwc3->usb_qscratch_reg->qscratch_cfg_reg,
+			PIPE_UTMI_CLK_SEL | PIPE3_PHYSTATUS_SW);
+	udelay(3);
+	clrbits_le32(&dwc3->usb_qscratch_reg->qscratch_cfg_reg,
+			PIPE_UTMI_CLK_DIS);
+
+	printk(BIOS_INFO, "DWC3 and PHY setup finished\n");
+}