1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2013-2014 Panasonic Corporation
4 * Copyright (C) 2015-2016 Socionext Inc.
8 #include <linux/errno.h>
12 #include "../sc-regs.h"
14 #undef DPLL_SSC_RATE_1PER
16 int uniphier_ld4_dpll_init(const struct uniphier_board_data *bd)
18 unsigned int dram_freq = bd->dram_freq;
23 * Set 0xc(1600MHz)/0xd(1333MHz)/0xe(1066MHz)
24 * to FOUT (DPLLCTRL.bit[29:20])
26 tmp = readl(sc_base + SC_DPLLCTRL);
36 pr_err("Unsupported frequency");
40 #if defined(DPLL_SSC_RATE_1PER)
41 tmp &= ~SC_DPLLCTRL_SSC_RATE;
43 tmp |= SC_DPLLCTRL_SSC_RATE;
45 writel(tmp, sc_base + SC_DPLLCTRL);
47 tmp = readl(sc_base + SC_DPLLCTRL2);
48 tmp |= SC_DPLLCTRL2_NRSTDS;
49 writel(tmp, sc_base + SC_DPLLCTRL2);
51 /* Wait 500 usec until dpll gets stable */