1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2011-2014 Panasonic Corporation
4  * Copyright (C) 2015-2017 Socionext Inc.
5  */
6 
7 #include <common.h>
8 #include <spl.h>
9 #include <linux/io.h>
10 
11 #include "../init.h"
12 #include "../sc-regs.h"
13 
14 void uniphier_ld4_early_clk_init(void)
15 {
16 	u32 tmp;
17 
18 	/* deassert reset */
19 	if (spl_boot_device() != BOOT_DEVICE_NAND) {
20 		tmp = readl(SC_RSTCTRL);
21 		tmp &= ~SC_RSTCTRL_NRST_NAND;
22 		writel(tmp, SC_RSTCTRL);
23 	};
24 
25 	/* provide clocks */
26 	tmp = readl(SC_CLKCTRL);
27 	tmp |= SC_CLKCTRL_CEN_SBC | SC_CLKCTRL_CEN_PERI;
28 	writel(tmp, SC_CLKCTRL);
29 	readl(SC_CLKCTRL); /* dummy read */
30 }
31