1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Renesas USB driver RZ/A initialization and power control 4 * 5 * Copyright (C) 2018 Chris Brandt 6 * Copyright (C) 2018 Renesas Electronics Corporation 7 */ 8 9 #include <linux/delay.h> 10 #include <linux/io.h> 11 #include <linux/of_device.h> 12 #include "common.h" 13 #include "rza.h" 14 15 static int usbhs_rza1_hardware_init(struct platform_device *pdev) 16 { 17 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev); 18 struct device_node *usb_x1_clk, *extal_clk; 19 u32 freq_usb = 0, freq_extal = 0; 20 21 /* Input Clock Selection (NOTE: ch0 controls both ch0 and ch1) */ 22 usb_x1_clk = of_find_node_by_name(NULL, "usb_x1"); 23 extal_clk = of_find_node_by_name(NULL, "extal"); 24 of_property_read_u32(usb_x1_clk, "clock-frequency", &freq_usb); 25 of_property_read_u32(extal_clk, "clock-frequency", &freq_extal); 26 if (freq_usb == 0) { 27 if (freq_extal == 12000000) { 28 /* Select 12MHz XTAL */ 29 usbhs_bset(priv, SYSCFG, UCKSEL, UCKSEL); 30 } else { 31 dev_err(usbhs_priv_to_dev(priv), "A 48MHz USB clock or 12MHz main clock is required.\n"); 32 return -EIO; 33 } 34 } 35 36 /* Enable USB PLL (NOTE: ch0 controls both ch0 and ch1) */ 37 usbhs_bset(priv, SYSCFG, UPLLE, UPLLE); 38 udelay(1000); 39 usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM); 40 41 return 0; 42 } 43 44 static int usbhs_rza_get_id(struct platform_device *pdev) 45 { 46 return USBHS_GADGET; 47 } 48 49 const struct renesas_usbhs_platform_callback usbhs_rza1_ops = { 50 .hardware_init = usbhs_rza1_hardware_init, 51 .get_id = usbhs_rza_get_id, 52 }; 53