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// SPDX-License-Identifier: GPL-2.0
/*
* Renesas USB driver RZ/A initialization and power control
*
* Copyright (C) 2018 Chris Brandt
* Copyright (C) 2018-2019 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);
usleep_range(1000, 2000);
usbhs_bset(priv, SUSPMODE, SUSPM, SUSPM);
return 0;
}
const struct renesas_usbhs_platform_callback usbhs_rza1_ops = {
.hardware_init = usbhs_rza1_hardware_init,
.get_id = usbhs_get_id_as_gadget,
};
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