// SPDX-License-Identifier: GPL-2.0 /* * Renesas USB driver RZ/A initialization and power control * * Copyright (C) 2018 Chris Brandt * Copyright (C) 2018 Renesas Electronics Corporation */ #include <linux/delay.h> #include <linux/io.h> #include <linux/of_device.h> #include "common.h" #include "rza.h" static int usbhs_rza1_hardware_init(struct platform_device *pdev) { struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev); struct device_node *usb_x1_clk, *extal_clk; u32 freq_usb = 0, freq_extal = 0; /* Input Clock Selection (NOTE: ch0 controls both ch0 and ch1) */ usb_x1_clk = of_find_node_by_name(NULL, "usb_x1"); extal_clk = of_find_node_by_name(NULL, "extal"); of_property_read_u32(usb_x1_clk, "clock-frequency", &freq_usb); of_property_read_u32(extal_clk, "clock-frequency", &freq_extal); if (freq_usb == 0) { if (freq_extal == 12000000) { /* Select 12MHz XTAL */ usbhs_bset(priv, SYSCFG, UCKSEL, UCKSEL); } else { dev_err(usbhs_priv_to_dev(priv), "A 48MHz USB clock or 12MHz main clock is required.\n"); return -EIO; } } /* Enable USB PLL (NOTE: ch0 controls both ch0 and ch1) */ usbhs_bset(priv, SYSCFG, UPLLE, UPLLE); udelay(1000); usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM); return 0; } static int usbhs_rza_get_id(struct platform_device *pdev) { return USBHS_GADGET; } const struct renesas_usbhs_platform_callback usbhs_rza1_ops = { .hardware_init = usbhs_rza1_hardware_init, .get_id = usbhs_rza_get_id, };