forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
1.5 KiB
52 lines
1.5 KiB
// 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_info usbhs_rza1_plat_info = { |
|
.platform_callback = { |
|
.hardware_init = usbhs_rza1_hardware_init, |
|
.get_id = usbhs_get_id_as_gadget, |
|
}, |
|
.driver_param = { |
|
.has_new_pipe_configs = 1, |
|
}, |
|
};
|
|
|