u-boot/arch/arm/mach-uniphier/clk/dpll-ld4.c
Masahiro Yamada 0f4ec05bbb ARM: uniphier: replace <linux/err.h> with <linux/errno.h>
These files only need error number macros.  Actually, IS_ERR(),
PTR_ERR(), ERR_PTR(), etc. are not useful for U-Boot.  Avoid
unnecessary header includes.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2017-01-22 15:32:56 +09:00

56 lines
1,020 B
C

/*
* Copyright (C) 2013-2014 Panasonic Corporation
* Copyright (C) 2015-2016 Socionext Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/errno.h>
#include <linux/io.h>
#include "../init.h"
#include "../sc-regs.h"
#undef DPLL_SSC_RATE_1PER
int uniphier_ld4_dpll_init(const struct uniphier_board_data *bd)
{
unsigned int dram_freq = bd->dram_freq;
u32 tmp;
/*
* Set Frequency
* Set 0xc(1600MHz)/0xd(1333MHz)/0xe(1066MHz)
* to FOUT (DPLLCTRL.bit[29:20])
*/
tmp = readl(SC_DPLLCTRL);
tmp &= ~0x000f0000;
switch (dram_freq) {
case 1333:
tmp |= 0x000d0000;
break;
case 1600:
tmp |= 0x000c0000;
break;
default:
pr_err("Unsupported frequency");
return -EINVAL;
}
#if defined(DPLL_SSC_RATE_1PER)
tmp &= ~SC_DPLLCTRL_SSC_RATE;
#else
tmp |= SC_DPLLCTRL_SSC_RATE;
#endif
writel(tmp, SC_DPLLCTRL);
tmp = readl(SC_DPLLCTRL2);
tmp |= SC_DPLLCTRL2_NRSTDS;
writel(tmp, SC_DPLLCTRL2);
/* Wait 500 usec until dpll gets stable */
udelay(500);
return 0;
}