ARM: shmobile: Initial r7s72100 SoC support

Add initial support for the r7272100 SoC including:
 - Single Cortex-A9 CPU Core
 - GIC

No static virtual mappings are used, all the components
make use of ioremap(). DT_MACHINE_START is still wrapped
in CONFIG_USE_OF to match other mach-shmobile code.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

1 files changed, 194 insertions, 0 deletions

diff --git a/arch/arm/mach-shmobile/clock-r7s72100.c b/arch/arm/mach-shmobile/clock-r7s72100.c
new file mode 100644
index 000000000000..1e71094f809d
--- /dev/null
+++ b/arch/arm/mach-shmobile/clock-r7s72100.c
@@ -0,0 +1,194 @@
+/*
+ * r7a72100 clock framework support
+ *
+ * Copyright (C) 2013  Renesas Solutions Corp.
+ * Copyright (C) 2012  Phil Edworthy
+ * Copyright (C) 2011  Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/sh_clk.h>
+#include <linux/clkdev.h>
+#include <mach/common.h>
+#include <mach/r7s72100.h>
+
+/* registers */
+#define FRQCR		0xfcfe0010
+#define FRQCR2		0xfcfe0014
+#define STBCR3		0xfcfe0420
+#define STBCR4		0xfcfe0424
+
+#define PLL_RATE 30
+
+static struct clk_mapping cpg_mapping = {
+	.phys	= 0xfcfe0000,
+	.len	= 0x1000,
+};
+
+/* Fixed 32 KHz root clock for RTC */
+static struct clk r_clk = {
+	.rate           = 32768,
+};
+
+/*
+ * Default rate for the root input clock, reset this with clk_set_rate()
+ * from the platform code.
+ */
+static struct clk extal_clk = {
+	.rate		= 13330000,
+	.mapping	= &cpg_mapping,
+};
+
+static unsigned long pll_recalc(struct clk *clk)
+{
+	return clk->parent->rate * PLL_RATE;
+}
+
+static struct sh_clk_ops pll_clk_ops = {
+	.recalc		= pll_recalc,
+};
+
+static struct clk pll_clk = {
+	.ops		= &pll_clk_ops,
+	.parent		= &extal_clk,
+	.flags		= CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long bus_recalc(struct clk *clk)
+{
+	return clk->parent->rate * 2 / 3;
+}
+
+static struct sh_clk_ops bus_clk_ops = {
+	.recalc		= bus_recalc,
+};
+
+static struct clk bus_clk = {
+	.ops		= &bus_clk_ops,
+	.parent		= &pll_clk,
+	.flags		= CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long peripheral0_recalc(struct clk *clk)
+{
+	return clk->parent->rate / 12;
+}
+
+static struct sh_clk_ops peripheral0_clk_ops = {
+	.recalc		= peripheral0_recalc,
+};
+
+static struct clk peripheral0_clk = {
+	.ops		= &peripheral0_clk_ops,
+	.parent		= &pll_clk,
+	.flags		= CLK_ENABLE_ON_INIT,
+};
+
+static unsigned long peripheral1_recalc(struct clk *clk)
+{
+	return clk->parent->rate / 6;
+}
+
+static struct sh_clk_ops peripheral1_clk_ops = {
+	.recalc		= peripheral1_recalc,
+};
+
+static struct clk peripheral1_clk = {
+	.ops		= &peripheral1_clk_ops,
+	.parent		= &pll_clk,
+	.flags		= CLK_ENABLE_ON_INIT,
+};
+
+struct clk *main_clks[] = {
+	&r_clk,
+	&extal_clk,
+	&pll_clk,
+	&bus_clk,
+	&peripheral0_clk,
+	&peripheral1_clk,
+};
+
+static int div2[] = { 1, 3, 0, 3 }; /* 1, 2/3, reserve, 1/3 */
+static int multipliers[] = { 1, 2, 1, 1 };
+
+static struct clk_div_mult_table div4_div_mult_table = {
+	.divisors = div2,
+	.nr_divisors = ARRAY_SIZE(div2),
+	.multipliers = multipliers,
+	.nr_multipliers = ARRAY_SIZE(multipliers),
+};
+
+static struct clk_div4_table div4_table = {
+	.div_mult_table = &div4_div_mult_table,
+};
+
+enum { DIV4_I,
+	DIV4_NR };
+
+#define DIV4(_reg, _bit, _mask, _flags) \
+	SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
+
+/* The mask field specifies the div2 entries that are valid */
+struct clk div4_clks[DIV4_NR] = {
+	[DIV4_I]  = DIV4(FRQCR, 8, 0xB, CLK_ENABLE_REG_16BIT
+					| CLK_ENABLE_ON_INIT),
+};
+
+enum { MSTP47, MSTP46, MSTP45, MSTP44, MSTP43, MSTP42, MSTP41, MSTP40,
+	MSTP33,	MSTP_NR };
+
+static struct clk mstp_clks[MSTP_NR] = {
+	[MSTP47] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 7, 0), /* SCIF0 */
+	[MSTP46] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 6, 0), /* SCIF1 */
+	[MSTP45] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 5, 0), /* SCIF2 */
+	[MSTP44] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 4, 0), /* SCIF3 */
+	[MSTP43] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 3, 0), /* SCIF4 */
+	[MSTP42] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 2, 0), /* SCIF5 */
+	[MSTP41] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 1, 0), /* SCIF6 */
+	[MSTP40] = SH_CLK_MSTP8(&peripheral1_clk, STBCR4, 0, 0), /* SCIF7 */
+	[MSTP33] = SH_CLK_MSTP8(&peripheral0_clk, STBCR3, 3, 0), /* MTU2 */
+};
+
+static struct clk_lookup lookups[] = {
+	/* main clocks */
+	CLKDEV_CON_ID("rclk", &r_clk),
+	CLKDEV_CON_ID("extal", &extal_clk),
+	CLKDEV_CON_ID("pll_clk", &pll_clk),
+	CLKDEV_CON_ID("peripheral_clk", &peripheral1_clk),
+
+	/* DIV4 clocks */
+	CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
+
+	/* MSTP clocks */
+};
+
+void __init r7s72100_clock_init(void)
+{
+	int k, ret = 0;
+
+	for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
+		ret = clk_register(main_clks[k]);
+
+	clkdev_add_table(lookups, ARRAY_SIZE(lookups));
+
+	if (!ret)
+		ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
+
+	if (!ret)
+		ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
+
+	if (!ret)
+		shmobile_clk_init();
+	else
+		panic("failed to setup rza1 clocks\n");
+}