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![Neil Armstrong](/assets/img/avatar_default.png)
The VIM3 on-board MCU can mux the PCIe/USB3.0 shared differential lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between an USB3.0 Type A connector and a M.2 Key M slot. The PHY driving these differential lines is shared between the USB3.0 controller and the PCIe Controller, thus only a single controller can use it. This adds this dynamic switching right before booting Linux and the configuration steps in the boards documentation. Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Kevin Hilman <khilman@baylibre.com> Tested-by: Kevin Hilman <khilman@baylibre.com> [narmstrong: fixed warning by replacing min() by min_t()]
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 BayLibre, SAS
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <env_internal.h>
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#include <init.h>
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#include <net.h>
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#include <asm/io.h>
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#include <asm/arch/eth.h>
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#include <i2c.h>
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#include "khadas-mcu.h"
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/*
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* The VIM3 on-board MCU can mux the PCIe/USB3.0 shared differential
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* lines using a FUSB340TMX USB 3.1 SuperSpeed Data Switch between
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* an USB3.0 Type A connector and a M.2 Key M slot.
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* The PHY driving these differential lines is shared between
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* the USB3.0 controller and the PCIe Controller, thus only
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* a single controller can use it.
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*/
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int meson_ft_board_setup(void *blob, struct bd_info *bd)
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{
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struct udevice *bus, *dev;
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int node, i2c_node, ret;
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unsigned int i2c_addr;
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u32 *val;
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/* Find I2C device */
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node = fdt_node_offset_by_compatible(gd->fdt_blob, -1, "khadas,mcu");
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if (node < 0) {
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printf("vim3: cannot find khadas,mcu node\n");
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return 0;
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}
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/* Get addr */
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val = (u32 *)fdt_getprop(gd->fdt_blob, node, "reg", NULL);
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if (!val) {
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printf("vim3: cannot find khadas,mcu node i2c addr\n");
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return 0;
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}
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i2c_addr = fdt32_to_cpu(*val);
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/* Get i2c device */
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i2c_node = fdt_parent_offset(gd->fdt_blob, node);
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if (node < 0) {
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printf("vim3: cannot find khadas,mcu i2c node\n");
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return 0;
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}
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ret = uclass_get_device_by_of_offset(UCLASS_I2C, i2c_node, &bus);
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if (ret < 0) {
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printf("vim3: cannot find i2c bus (%d)\n", ret);
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return 0;
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}
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ret = i2c_get_chip(bus, i2c_addr, 1, &dev);
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if (ret < 0) {
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printf("vim3: cannot find i2c chip (%d)\n", ret);
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return 0;
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}
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/* Read USB_PCIE_SWITCH_REG */
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ret = dm_i2c_reg_read(dev, KHADAS_MCU_USB_PCIE_SWITCH_REG);
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if (ret < 0) {
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printf("vim3: failed to read i2c reg (%d)\n", ret);
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return 0;
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}
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debug("MCU_USB_PCIE_SWITCH_REG: %d\n", ret);
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/*
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* If in PCIe mode, alter DT
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* 0:Enable USB3.0,Disable PCIE, 1:Disable USB3.0, Enable PCIE
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*/
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if (ret > 0) {
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static char data[32] __aligned(4);
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const void *ptmp;
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int len;
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/* Find USB node */
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node = fdt_node_offset_by_compatible(blob, -1, "amlogic,meson-g12a-usb-ctrl");
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if (node < 0) {
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printf("vim3: cannot find amlogic,meson-g12a-usb-ctrl node\n");
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return 0;
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}
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/* Update PHY names (mandatory to disable USB3.0) */
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len = strlcpy(data, "usb2-phy0", 32) + 1;
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len += strlcpy(&data[len], "usb2-phy1", 32 - len) + 1;
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ret = fdt_setprop(blob, node, "phy-names", data, len);
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if (ret < 0) {
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printf("vim3: failed to update usb phy names property (%d)\n", ret);
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return 0;
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}
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/* Update PHY list, by keeping the 2 first entries (optional) */
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ptmp = fdt_getprop(blob, node, "phys", &len);
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if (ptmp) {
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memcpy(data, ptmp, min_t(unsigned int, 2 * sizeof(u32), len));
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ret = fdt_setprop(blob, node, "phys", data,
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min_t(unsigned int, 2 * sizeof(u32), len));
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if (ret < 0)
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printf("vim3: failed to update usb phys property (%d)\n", ret);
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} else
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printf("vim3: cannot find usb node phys property\n");
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/* Find PCIe node */
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node = fdt_node_offset_by_compatible(blob, -1, "amlogic,g12a-pcie");
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if (node < 0) {
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printf("vim3: cannot find amlogic,g12a-pcie node\n");
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return 0;
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}
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/* Enable PCIe */
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len = strlcpy(data, "okay", 32);
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ret = fdt_setprop(blob, node, "status", data, len);
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if (ret < 0) {
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printf("vim3: failed to enable pcie node (%d)\n", ret);
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return 0;
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}
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printf("vim3: successfully enabled PCIe\n");
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}
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return 0;
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}
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int misc_init_r(void)
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{
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meson_eth_init(PHY_INTERFACE_MODE_RGMII, 0);
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return 0;
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}
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