arm: meson-axg: add board_usb_init()/cleanup() for USB gadget

Add the board_usb_init()/cleanup() for USB gadget for AXG based
on the code for the G12A architecture.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

diff --git a/arch/arm/mach-meson/board-axg.c b/arch/arm/mach-meson/board-axg.c
index 5e0b3f6cb5e161d132916b7883de4112996fc0df..0d4eda93b8c3d88f8b4afb54b5478aa4fbada688 100644 (file)
--- a/arch/arm/mach-meson/board-axg.c
+++ b/arch/arm/mach-meson/board-axg.c
@@ -14,6 +14,11 @@
 #include <asm/io.h>
 #include <asm/armv8/mmu.h>
 #include <linux/sizes.h>
+#include <usb.h>
+#include <linux/usb/otg.h>
+#include <asm/arch/usb-gx.h>
+#include <usb/dwc2_udc.h>
+#include <clk.h>
 #include <phy.h>
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -118,3 +123,126 @@ void meson_eth_init(phy_interface_t mode, unsigned int flags)
        /* Enable power gate */
        clrbits_le32(AXG_MEM_PD_REG_0, AXG_MEM_PD_REG_0_ETH_MASK);
 }
+
+#if CONFIG_IS_ENABLED(USB_DWC3_MESON_GXL) && \
+       CONFIG_IS_ENABLED(USB_GADGET_DWC2_OTG)
+static struct dwc2_plat_otg_data meson_gx_dwc2_data;
+
+int board_usb_init(int index, enum usb_init_type init)
+{
+       struct fdtdec_phandle_args args;
+       const void *blob = gd->fdt_blob;
+       int node, dwc2_node;
+       struct udevice *dev, *clk_dev;
+       struct clk clk;
+       int ret;
+
+       /* find the usb glue node */
+       node = fdt_node_offset_by_compatible(blob, -1,
+                                            "amlogic,meson-gxl-usb-ctrl");
+       if (node < 0) {
+               debug("Not found usb-control node\n");
+               return -ENODEV;
+       }
+
+       if (!fdtdec_get_is_enabled(blob, node)) {
+               debug("usb is disabled in the device tree\n");
+               return -ENODEV;
+       }
+
+       ret = uclass_get_device_by_of_offset(UCLASS_SIMPLE_BUS, node, &dev);
+       if (ret) {
+               debug("Not found usb-control device\n");
+               return ret;
+       }
+
+       /* find the dwc2 node */
+       dwc2_node = fdt_node_offset_by_compatible(blob, node,
+                                                 "amlogic,meson-g12a-usb");
+       if (dwc2_node < 0) {
+               debug("Not found dwc2 node\n");
+               return -ENODEV;
+       }
+
+       if (!fdtdec_get_is_enabled(blob, dwc2_node)) {
+               debug("dwc2 is disabled in the device tree\n");
+               return -ENODEV;
+       }
+
+       meson_gx_dwc2_data.regs_otg = fdtdec_get_addr(blob, dwc2_node, "reg");
+       if (meson_gx_dwc2_data.regs_otg == FDT_ADDR_T_NONE) {
+               debug("usbotg: can't get base address\n");
+               return -ENODATA;
+       }
+
+       /* Enable clock */
+       ret = fdtdec_parse_phandle_with_args(blob, dwc2_node, "clocks",
+                                            "#clock-cells", 0, 0, &args);
+       if (ret) {
+               debug("usbotg has no clocks defined in the device tree\n");
+               return ret;
+       }
+
+       ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, &clk_dev);
+       if (ret)
+               return ret;
+
+       if (args.args_count != 1) {
+               debug("Can't find clock ID in the device tree\n");
+               return -ENODATA;
+       }
+
+       clk.dev = clk_dev;
+       clk.id = args.args[0];
+
+       ret = clk_enable(&clk);
+       if (ret) {
+               debug("Failed to enable usbotg clock\n");
+               return ret;
+       }
+
+       meson_gx_dwc2_data.rx_fifo_sz = fdtdec_get_int(blob, dwc2_node,
+                                                    "g-rx-fifo-size", 0);
+       meson_gx_dwc2_data.np_tx_fifo_sz = fdtdec_get_int(blob, dwc2_node,
+                                                       "g-np-tx-fifo-size", 0);
+       meson_gx_dwc2_data.tx_fifo_sz = fdtdec_get_int(blob, dwc2_node,
+                                                    "g-tx-fifo-size", 0);
+
+       /* Switch to peripheral mode */
+       ret = dwc3_meson_gxl_force_mode(dev, USB_DR_MODE_PERIPHERAL);
+       if (ret)
+               return ret;
+
+       return dwc2_udc_probe(&meson_gx_dwc2_data);
+}
+
+int board_usb_cleanup(int index, enum usb_init_type init)
+{
+       const void *blob = gd->fdt_blob;
+       struct udevice *dev;
+       int node;
+       int ret;
+
+       /* find the usb glue node */
+       node = fdt_node_offset_by_compatible(blob, -1,
+                                            "amlogic,meson-gxl-usb-ctrl");
+       if (node < 0) {
+               debug("Not found usb-control node\n");
+               return -ENODEV;
+       }
+
+       if (!fdtdec_get_is_enabled(blob, node))
+               return -ENODEV;
+
+       ret = uclass_get_device_by_of_offset(UCLASS_SIMPLE_BUS, node, &dev);
+       if (ret)
+               return ret;
+
+       /* Switch to OTG mode */
+       ret = dwc3_meson_gxl_force_mode(dev, USB_DR_MODE_HOST);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+#endif