usb: dwc3: Add dwc3 glue driver for am62

Add glue code for TI AM62 to the dwc3 driver; Most code adopted from
TI vendor u-boot code.

Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
Tested-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> # on beagle play

diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
index c0c8c16fd9c274aaacd2bd2ac69c615660e799c1..0100723a68b093a4463b1fcb2e17e77df85f6286 100644 (file)
--- a/drivers/usb/dwc3/Kconfig
+++ b/drivers/usb/dwc3/Kconfig
@@ -37,6 +37,20 @@ config SPL_USB_DWC3_GENERIC
          Select this for Xilinx ZynqMP and similar Platforms.
          This wrapper supports Host and Peripheral operation modes.
 
+config SPL_USB_DWC3_AM62
+       bool "TI AM62 USB wrapper"
+       depends on SPL_DM_USB && SPL_USB_DWC3_GENERIC && SPL_SYSCON
+       help
+         Select this for TI AM62 Platforms.
+         This wrapper supports Host and Peripheral operation modes.
+
+config USB_DWC3_AM62
+       bool "TI AM62 USB wrapper"
+       depends on DM_USB && USB_DWC3_GENERIC && SYSCON
+       help
+         Select this for TI AM62 Platforms.
+         This wrapper supports Host and Peripheral operation modes.
+
 config USB_DWC3_MESON_G12A
        bool "Amlogic Meson G12A USB wrapper"
        depends on DM_USB && USB_DWC3 && ARCH_MESON

diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
index 97b4f7191ca38915927c60daf13e452df348d65e..a46b6824ab7428b9cbe43d7eb13d0fd98717e8b4 100644 (file)
--- a/drivers/usb/dwc3/Makefile
+++ b/drivers/usb/dwc3/Makefile
@@ -6,6 +6,7 @@ dwc3-y                                  := core.o
 
 obj-$(CONFIG_USB_DWC3_GADGET)          += gadget.o ep0.o
 
+obj-$(CONFIG_$(SPL_)USB_DWC3_AM62)     += dwc3-am62.o
 obj-$(CONFIG_USB_DWC3_OMAP)            += dwc3-omap.o
 obj-$(CONFIG_USB_DWC3_MESON_G12A)      += dwc3-meson-g12a.o
 obj-$(CONFIG_USB_DWC3_MESON_GXL)       += dwc3-meson-gxl.o

diff --git a/drivers/usb/dwc3/dwc3-am62.c b/drivers/usb/dwc3/dwc3-am62.c
new file mode 100644 (file)
index 0000000..9951960
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-am62.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI AM62 specific glue layer for DWC3
+ */
+
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <regmap.h>
+#include <syscon.h>
+#include <asm/io.h>
+
+#include "dwc3-generic.h"
+
+#define USBSS_MODE_CONTROL             0x1c
+#define USBSS_PHY_CONFIG               0x8
+#define USBSS_PHY_VBUS_SEL_MASK                GENMASK(2, 1)
+#define USBSS_PHY_VBUS_SEL_SHIFT       1
+#define USBSS_MODE_VALID       BIT(0)
+#define PHY_PLL_REFCLK_MASK    GENMASK(3, 0)
+static const int dwc3_ti_am62_rate_table[] = { /* in KHZ */
+       9600,
+       10000,
+       12000,
+       19200,
+       20000,
+       24000,
+       25000,
+       26000,
+       38400,
+       40000,
+       58000,
+       50000,
+       52000,
+};
+
+static void dwc3_ti_am62_glue_configure(struct udevice *dev, int index,
+                                       enum usb_dr_mode mode)
+{
+       struct clk usb2_refclk;
+       int rate_code, i, ret;
+       unsigned long rate;
+       u32 reg;
+       void *usbss;
+       bool vbus_divider;
+       struct regmap *syscon;
+       struct ofnode_phandle_args args;
+
+       usbss = dev_remap_addr_index(dev, 0);
+       if (IS_ERR(usbss)) {
+               dev_err(dev, "can't map IOMEM resource\n");
+               return;
+       }
+
+       ret = clk_get_by_name(dev, "ref", &usb2_refclk);
+       if (ret) {
+               dev_err(dev, "can't get usb2_refclk\n");
+               return;
+       }
+
+       /* Calculate the rate code */
+       rate = clk_get_rate(&usb2_refclk);
+       rate /= 1000;   /* To KHz */
+       for (i = 0; i < ARRAY_SIZE(dwc3_ti_am62_rate_table); i++) {
+               if (dwc3_ti_am62_rate_table[i] == rate)
+                       break;
+       }
+
+       if (i == ARRAY_SIZE(dwc3_ti_am62_rate_table)) {
+               dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
+               return;
+       }
+
+       rate_code = i;
+
+       /* Read the syscon property */
+       syscon = syscon_regmap_lookup_by_phandle(dev, "ti,syscon-phy-pll-refclk");
+       if (IS_ERR(syscon)) {
+               dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");
+               return;
+       }
+
+       ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "ti,syscon-phy-pll-refclk", NULL, 1,
+                                            0, &args);
+       if (ret)
+               return;
+
+       /* Program PHY PLL refclk by reading syscon property */
+       ret = regmap_update_bits(syscon, args.args[0], PHY_PLL_REFCLK_MASK, rate_code);
+       if (ret) {
+               dev_err(dev, "failed to set phy pll reference clock rate\n");
+               return;
+       }
+
+       /* VBUS divider select */
+       reg = readl(usbss + USBSS_PHY_CONFIG);
+       vbus_divider = dev_read_bool(dev, "ti,vbus-divider");
+       if (vbus_divider)
+               reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT;
+
+       writel(reg, usbss + USBSS_PHY_CONFIG);
+
+       /* Set mode valid */
+       reg = readl(usbss + USBSS_MODE_CONTROL);
+       reg |= USBSS_MODE_VALID;
+       writel(reg, usbss + USBSS_MODE_CONTROL);
+}
+
+struct dwc3_glue_ops ti_am62_ops = {
+       .glue_configure = dwc3_ti_am62_glue_configure,
+};
+
+static const struct udevice_id dwc3_am62_match[] = {
+       { .compatible = "ti,am62-usb", .data = (ulong)&ti_am62_ops },
+       { /* sentinel */ }
+};
+
+U_BOOT_DRIVER(dwc3_am62_wrapper) = {
+       .name   = "dwc3-am62",
+       .id     = UCLASS_SIMPLE_BUS,
+       .of_match = dwc3_am62_match,
+       .bind = dwc3_glue_bind,
+       .probe = dwc3_glue_probe,
+       .remove = dwc3_glue_remove,
+       .plat_auto      = sizeof(struct dwc3_glue_data),
+};