mediatek: Refactor USB code among similar SoCs

Refactor USB code which will be reused among similar SoCs.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Elm

Change-Id: I06fefb4149a489be991e13ddf624082d11e31765
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/28786
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/common/usb.c

@@ -0,0 +1,167 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek 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 <arch/io.h>
+#include <console/console.h>
+#include <delay.h>
+#include <soc/addressmap.h>
+#include <soc/usb.h>
+#include <timer.h>
+
+#define USBTAG	"[SSUSB] "
+#define u3p_msg(fmt, arg...)   printk(BIOS_INFO, USBTAG fmt, ##arg)
+#define u3p_err(fmt, arg...)   printk(BIOS_ERR, USBTAG fmt, ##arg)
+
+static struct ssusb_ippc_regs *ippc_regs = (void *)(SSUSB_IPPC_BASE);
+static struct ssusb_sif_port *phy_ports = (void *)(SSUSB_SIF_BASE);
+
+static void phy_index_power_on(int index)
+{
+	struct ssusb_sif_port *phy = phy_ports + index;
+
+	if (!index) {
+		/* Set RG_SSUSB_VUSB10_ON as 1 after VUSB10 ready */
+		setbits_le32(&phy->u3phya.phya_reg0, P3A_RG_U3_VUSB10_ON);
+		/* Disable power domain ISO */
+		clrbits_le32(&phy->u2phy.usbphyacr6, PA6_RG_U2_ISO_EN);
+	}
+	/* Switch system IP to USB mode */
+	clrbits_le32(&phy->u2phy.u2phydtm0, P2C_FORCE_UART_EN);
+	clrbits_le32(&phy->u2phy.u2phydtm1, P2C_RG_UART_EN);
+	if (!index)
+		clrbits_le32(&phy->u2phy.u2phyacr4, P2C_U2_GPIO_CTR_MSK);
+
+	/* Disable force settings */
+	clrbits_le32(&phy->u2phy.u2phydtm0, P2C_FORCE_SUSPENDM |
+		P2C_RG_XCVRSEL | P2C_RG_DATAIN | P2C_DTM0_PART_MASK);
+
+	clrbits_le32(&phy->u2phy.usbphyacr6, PA6_RG_U2_BC11_SW_EN);
+	/* Improve Rx sensitivity */
+	clrsetbits_le32(&phy->u2phy.usbphyacr6,
+		PA6_RG_U2_SQTH, PA6_RG_U2_SQTH_VAL(2));
+
+	setbits_le32(&phy->u2phy.usbphyacr6, PA6_RG_U2_OTG_VBUSCMP_EN);
+
+	clrsetbits_le32(&phy->u3phya_da.reg0,
+		P3A_RG_XTAL_EXT_EN_U3, P3A_RG_XTAL_EXT_EN_U3_VAL(2));
+
+	clrsetbits_le32(&phy->u3phya.phya_reg9,
+		P3A_RG_RX_DAC_MUX, P3A_RG_RX_DAC_MUX_VAL(4));
+
+	if (!index)
+		clrbits_le32(&phy->u2phy.usbphyacr5, PA5_RG_U2_HS_100U_U3_EN);
+
+	clrsetbits_le32(&phy->u3phya.phya_reg6,
+		P3A_RG_TX_EIDLE_CM, P3A_RG_TX_EIDLE_CM_VAL(0xe));
+
+	clrsetbits_le32(&phy->u3phyd.phyd_cdr1,
+		P3D_RG_CDR_BIR_LTD0, P3D_RG_CDR_BIR_LTD0_VAL(0xc));
+	clrsetbits_le32(&phy->u3phyd.phyd_cdr1,
+		P3D_RG_CDR_BIR_LTD1, P3D_RG_CDR_BIR_LTD1_VAL(0x3));
+
+	clrsetbits_le32(&phy->u2phy.u2phydtm1,
+		P2C_RG_SESSEND, P2C_RG_VBUSVALID | P2C_RG_AVALID);
+
+	/* Set USB 2.0 slew rate value */
+	clrsetbits_le32(&phy->u2phy.usbphyacr5,
+		PA5_RG_U2_HSTX_SRCTRL, PA5_RG_U2_HSTX_SRCTRL_VAL(4));
+}
+
+static void u3phy_power_on(void)
+{
+	for (int i = 0; i < USB_PORT_NUMBER; i++)
+		phy_index_power_on(i);
+}
+
+static int check_ip_clk_status(void)
+{
+	int u3_port_num;
+	u32 check_bits;
+	u32 sts1, sts2;
+	struct stopwatch sw;
+
+	u3_port_num = CAP_U3_PORT_NUM(read32(&ippc_regs->ip_xhci_cap));
+
+	check_bits = STS1_SYSPLL_STABLE | STS1_REF_RST | STS1_SYS125_RST;
+	check_bits |= (u3_port_num ? STS1_U3_MAC_RST : 0);
+
+	stopwatch_init_usecs_expire(&sw, 50000);
+
+	do {
+		if (stopwatch_expired(&sw)) {
+			u3p_err("usb clocks are not stable!!!\n");
+			return -1;
+		}
+
+		sts1 = read32(&ippc_regs->ip_pw_sts1) & check_bits;
+		sts2 = read32(&ippc_regs->ip_pw_sts2) & STS2_U2_MAC_RST;
+	} while ((sts1 != check_bits) || !sts2);
+
+	return 0;
+}
+
+static int u3phy_ports_enable(void)
+{
+	int i;
+	u32 value;
+	int u3_port_num;
+	int u2_port_num;
+
+	value = read32(&ippc_regs->ip_xhci_cap);
+	u3_port_num = CAP_U3_PORT_NUM(value);
+	u2_port_num = CAP_U2_PORT_NUM(value);
+	u3p_msg("%s u2p:%d, u3p:%d\n", __func__, u2_port_num, u3_port_num);
+
+	/* Power on host ip */
+	clrbits_le32(&ippc_regs->ip_pw_ctr1, CTRL1_IP_HOST_PDN);
+
+	/* Power on and enable all u3 ports */
+	for (i = 0; i < u3_port_num; i++) {
+		clrsetbits_le32(&ippc_regs->u3_ctrl_p[i],
+			CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS,
+			CTRL_U3_PORT_HOST_SEL);
+	}
+
+	/* Power on and enable all u2 ports */
+	for (i = 0; i < u2_port_num; i++) {
+		clrsetbits_le32(&ippc_regs->u2_ctrl_p[i],
+			CTRL_U2_PORT_PDN | CTRL_U2_PORT_DIS,
+			CTRL_U2_PORT_HOST_SEL);
+	}
+	return check_ip_clk_status();
+}
+
+static inline void ssusb_soft_reset(void)
+{
+	/* Reset whole ip */
+	setbits_le32(&ippc_regs->ip_pw_ctr0, CTRL0_IP_SW_RST);
+	clrbits_le32(&ippc_regs->ip_pw_ctr0, CTRL0_IP_SW_RST);
+}
+
+__weak void mtk_usb_prepare(void) { /* do nothing */ }
+
+void setup_usb_host(void)
+{
+	u3p_msg("Setting up USB HOST controller...\n");
+
+	mtk_usb_prepare();
+	ssusb_soft_reset();
+	if (u3phy_ports_enable()) {
+		u3p_err("%s fail to enable ports\n", __func__);
+		return;
+	}
+	u3phy_power_on();
+	u3p_msg("phy power-on done.\n");
+}