From a9ca4193bd3d96f1545d30c4b6a6845442403f26 Mon Sep 17 00:00:00 2001
From: Vignesh Raghavendra <vigneshr@ti.com>
Date: Tue, 1 Oct 2019 17:26:35 +0530
Subject: [PATCH] usb: cdns3: Add TI wrapper driver for CDNS USB3 controller
Add driver to handle TI specific wrapper for Cadence USB3 controller
present on J721e SoC. Based on Linux driver for the same.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
drivers/usb/cdns3/Kconfig | 7 ++
drivers/usb/cdns3/Makefile | 2 +
drivers/usb/cdns3/cdns3-ti.c | 193 +++++++++++++++++++++++++++++++++++
3 files changed, 202 insertions(+)
create mode 100644 drivers/usb/cdns3/cdns3-ti.c
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
index 25c0f103e7..4cf59c70d4 100644
--- a/drivers/usb/cdns3/Kconfig
+++ b/drivers/usb/cdns3/Kconfig
@@ -48,4 +48,11 @@ config SPL_USB_CDNS3_HOST
Host controller is compliant with XHCI so it will use
standard XHCI driver.
+
+config USB_CDNS3_TI
+ tristate "Cadence USB3 support on TI platforms"
+ default USB_CDNS3
+ help
+ Say 'Y' here if you are building for Texas Instruments
+ platforms that contain Cadence USB3 controller core. E.g.: J721e.
endif
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
index 525477954d..18d7190755 100644
--- a/drivers/usb/cdns3/Makefile
+++ b/drivers/usb/cdns3/Makefile
@@ -7,3 +7,5 @@ obj-$(CONFIG_USB_CDNS3) += cdns3.o
cdns3-$(CONFIG_$(SPL_)USB_CDNS3_GADGET) += gadget.o ep0.o
cdns3-$(CONFIG_$(SPL_)USB_CDNS3_HOST) += host.o
+
+obj-$(CONFIG_USB_CDNS3_TI) += cdns3-ti.o
diff --git a/drivers/usb/cdns3/cdns3-ti.c b/drivers/usb/cdns3/cdns3-ti.c
new file mode 100644
index 0000000000..2fa0104f1b
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-ti.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * cdns_ti-ti.c - TI specific Glue layer for Cadence USB Controller
+ *
+ * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ */
+
+#include <common.h>
+#include <asm-generic/io.h>
+#include <clk.h>
+#include <dm.h>
+#include <linux/io.h>
+#include <linux/usb/otg.h>
+#include <malloc.h>
+
+#include "core.h"
+
+/* USB Wrapper register offsets */
+#define USBSS_PID 0x0
+#define USBSS_W1 0x4
+#define USBSS_STATIC_CONFIG 0x8
+#define USBSS_PHY_TEST 0xc
+#define USBSS_DEBUG_CTRL 0x10
+#define USBSS_DEBUG_INFO 0x14
+#define USBSS_DEBUG_LINK_STATE 0x18
+#define USBSS_DEVICE_CTRL 0x1c
+
+/* Wrapper 1 register bits */
+#define USBSS_W1_PWRUP_RST BIT(0)
+#define USBSS_W1_OVERCURRENT_SEL BIT(8)
+#define USBSS_W1_MODESTRAP_SEL BIT(9)
+#define USBSS_W1_OVERCURRENT BIT(16)
+#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17)
+#define USBSS_W1_MODESTRAP_SHIFT 17
+#define USBSS_W1_USB2_ONLY BIT(19)
+
+/* Static config register bits */
+#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5)
+#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5
+#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3)
+#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3
+#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1)
+#define USBSS1_STATIC_VBUS_SEL_SHIFT 1
+#define USBSS1_STATIC_LANE_REVERSE BIT(0)
+
+/* Modestrap modes */
+enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
+ USBSS_MODESTRAP_MODE_HOST,
+ USBSS_MODESTRAP_MODE_PERIPHERAL};
+
+struct cdns_ti {
+ struct udevice *dev;
+ void __iomem *usbss;
+ int usb2_only:1;
+ int vbus_divider:1;
+ struct clk *usb2_refclk;
+ struct clk *lpm_clk;
+};
+
+static const int cdns_ti_rate_table[] = { /* in KHZ */
+ 9600,
+ 10000,
+ 12000,
+ 19200,
+ 20000,
+ 24000,
+ 25000,
+ 26000,
+ 38400,
+ 40000,
+ 58000,
+ 50000,
+ 52000,
+};
+
+static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
+{
+ return readl(data->usbss + offset);
+}
+
+static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
+{
+ writel(value, data->usbss + offset);
+}
+
+static int cdns_ti_probe(struct udevice *dev)
+{
+ struct cdns_ti *data = dev_get_platdata(dev);
+ struct clk usb2_refclk;
+ int modestrap_mode;
+ unsigned long rate;
+ int rate_code, i;
+ u32 reg;
+ int ret;
+
+ data->dev = dev;
+
+ data->usbss = dev_remap_addr_index(dev, 0);
+ if (!data->usbss)
+ return -EINVAL;
+
+ ret = clk_get_by_name(dev, "usb2_refclk", &usb2_refclk);
+ if (ret) {
+ dev_err(dev, "Failed to get usb2_refclk\n");
+ return ret;
+ }
+
+ rate = clk_get_rate(&usb2_refclk);
+ rate /= 1000; /* To KHz */
+ for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
+ if (cdns_ti_rate_table[i] == rate)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
+ dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
+ return -EINVAL;
+ }
+
+ rate_code = i;
+
+ /* assert RESET */
+ reg = cdns_ti_readl(data, USBSS_W1);
+ reg &= ~USBSS_W1_PWRUP_RST;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ /* set static config */
+ reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+ reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
+ reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
+
+ reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
+ data->vbus_divider = dev_read_bool(dev, "ti,vbus-divider");
+ if (data->vbus_divider)
+ reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
+
+ cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
+ reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
+
+ /* set USB2_ONLY mode if requested */
+ reg = cdns_ti_readl(data, USBSS_W1);
+ data->usb2_only = dev_read_bool(dev, "ti,usb2-only");
+ if (data->usb2_only)
+ reg |= USBSS_W1_USB2_ONLY;
+
+ /* set modestrap */
+ if (dev_read_bool(dev, "ti,modestrap-host"))
+ modestrap_mode = USBSS_MODESTRAP_MODE_HOST;
+ else if (dev_read_bool(dev, "ti,modestrap-peripheral"))
+ modestrap_mode = USBSS_MODESTRAP_MODE_PERIPHERAL;
+ else
+ modestrap_mode = USBSS_MODESTRAP_MODE_NONE;
+
+ reg |= USBSS_W1_MODESTRAP_SEL;
+ reg &= ~USBSS_W1_MODESTRAP_MASK;
+ reg |= modestrap_mode << USBSS_W1_MODESTRAP_SHIFT;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ /* de-assert RESET */
+ reg |= USBSS_W1_PWRUP_RST;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ return 0;
+}
+
+static int cdns_ti_remove(struct udevice *dev)
+{
+ struct cdns_ti *data = dev_get_platdata(dev);
+ u32 reg;
+
+ /* put device back to RESET*/
+ reg = cdns_ti_readl(data, USBSS_W1);
+ reg &= ~USBSS_W1_PWRUP_RST;
+ cdns_ti_writel(data, USBSS_W1, reg);
+
+ return 0;
+}
+
+static const struct udevice_id cdns_ti_of_match[] = {
+ { .compatible = "ti,j721e-usb", },
+ {},
+};
+
+U_BOOT_DRIVER(cdns_ti) = {
+ .name = "cdns-ti",
+ .id = UCLASS_NOP,
+ .of_match = cdns_ti_of_match,
+ .bind = cdns3_bind,
+ .probe = cdns_ti_probe,
+ .remove = cdns_ti_remove,
+ .platdata_auto_alloc_size = sizeof(struct cdns_ti),
+ .flags = DM_FLAG_OS_PREPARE,
+};
--
2.39.5