ARM: uniphier: collect clock/PLL init code into a single directory

Now PLLs for DRAM controller are initialized in SPL, and the others
in U-Boot proper.  Setting up all of them in a single directory will
be helpful when we want to share code between SPL and U-Boot proper.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/arch/arm/mach-uniphier/clk/dpll-ld4.c b/arch/arm/mach-uniphier/clk/dpll-ld4.c
new file mode 100644
index 0000000000..a40b30d0e0
--- /dev/null
+++ b/arch/arm/mach-uniphier/clk/dpll-ld4.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2013-2014 Panasonic Corporation
+ * Copyright (C) 2015-2016 Socionext Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/err.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;
+}