ARM: S5P6442: Add clock support for S5P6442

This patch adds clock support for S5P6442. This patch adds the clock
register definitions and the various system clocks in S5P6442.

Signed-off-by: Adityapratap Sharma <aditya.ps@samsung.com>
Signed-off-by: Atul Dahiya <atul.dahiya@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 396 insertions, 0 deletions

diff --git a/arch/arm/mach-s5p6442/clock.c b/arch/arm/mach-s5p6442/clock.c
new file mode 100644
index 00000000000..3aadbf42c11
--- /dev/null
+++ b/arch/arm/mach-s5p6442/clock.c
@@ -0,0 +1,396 @@
+/* linux/arch/arm/mach-s5p6442/clock.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * S5P6442 - Clock support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/map.h>
+
+#include <plat/cpu-freq.h>
+#include <mach/regs-clock.h>
+#include <plat/clock.h>
+#include <plat/cpu.h>
+#include <plat/pll.h>
+#include <plat/s5p-clock.h>
+#include <plat/clock-clksrc.h>
+#include <plat/s5p6442.h>
+
+static struct clksrc_clk clk_mout_apll = {
+	.clk	= {
+		.name		= "mout_apll",
+		.id		= -1,
+	},
+	.sources	= &clk_src_apll,
+	.reg_src	= { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 },
+};
+
+static struct clksrc_clk clk_mout_mpll = {
+	.clk = {
+		.name		= "mout_mpll",
+		.id		= -1,
+	},
+	.sources	= &clk_src_mpll,
+	.reg_src	= { .reg = S5P_CLK_SRC0, .shift = 4, .size = 1 },
+};
+
+static struct clksrc_clk clk_mout_epll = {
+	.clk	= {
+		.name		= "mout_epll",
+		.id		= -1,
+	},
+	.sources	= &clk_src_epll,
+	.reg_src	= { .reg = S5P_CLK_SRC0, .shift = 8, .size = 1 },
+};
+
+/* Possible clock sources for ARM Mux */
+static struct clk *clk_src_arm_list[] = {
+	[1] = &clk_mout_apll.clk,
+	[2] = &clk_mout_mpll.clk,
+};
+
+static struct clksrc_sources clk_src_arm = {
+	.sources	= clk_src_arm_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_arm_list),
+};
+
+static struct clksrc_clk clk_mout_arm = {
+	.clk	= {
+		.name		= "mout_arm",
+		.id		= -1,
+	},
+	.sources	= &clk_src_arm,
+	.reg_src	= { .reg = S5P_CLK_MUX_STAT0, .shift = 16, .size = 3 },
+};
+
+static struct clk clk_dout_a2m = {
+	.name		= "dout_a2m",
+	.id		= -1,
+	.parent		= &clk_mout_apll.clk,
+};
+
+/* Possible clock sources for D0 Mux */
+static struct clk *clk_src_d0_list[] = {
+	[1] = &clk_mout_mpll.clk,
+	[2] = &clk_dout_a2m,
+};
+
+static struct clksrc_sources clk_src_d0 = {
+	.sources	= clk_src_d0_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_d0_list),
+};
+
+static struct clksrc_clk clk_mout_d0 = {
+	.clk = {
+		.name		= "mout_d0",
+		.id		= -1,
+	},
+	.sources	= &clk_src_d0,
+	.reg_src	= { .reg = S5P_CLK_MUX_STAT0, .shift = 20, .size = 3 },
+};
+
+static struct clk clk_dout_apll = {
+	.name		= "dout_apll",
+	.id		= -1,
+	.parent		= &clk_mout_arm.clk,
+};
+
+/* Possible clock sources for D0SYNC Mux */
+static struct clk *clk_src_d0sync_list[] = {
+	[1] = &clk_mout_d0.clk,
+	[2] = &clk_dout_apll,
+};
+
+static struct clksrc_sources clk_src_d0sync = {
+	.sources	= clk_src_d0sync_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_d0sync_list),
+};
+
+static struct clksrc_clk clk_mout_d0sync = {
+	.clk	= {
+		.name		= "mout_d0sync",
+		.id		= -1,
+	},
+	.sources	= &clk_src_d0sync,
+	.reg_src	= { .reg = S5P_CLK_MUX_STAT1, .shift = 28, .size = 3 },
+};
+
+/* Possible clock sources for D1 Mux */
+static struct clk *clk_src_d1_list[] = {
+	[1] = &clk_mout_mpll.clk,
+	[2] = &clk_dout_a2m,
+};
+
+static struct clksrc_sources clk_src_d1 = {
+	.sources	= clk_src_d1_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_d1_list),
+};
+
+static struct clksrc_clk clk_mout_d1 = {
+	.clk	= {
+		.name		= "mout_d1",
+		.id		= -1,
+	},
+	.sources	= &clk_src_d1,
+	.reg_src	= { .reg = S5P_CLK_MUX_STAT0, .shift = 24, .size = 3 },
+};
+
+/* Possible clock sources for D1SYNC Mux */
+static struct clk *clk_src_d1sync_list[] = {
+	[1] = &clk_mout_d1.clk,
+	[2] = &clk_dout_apll,
+};
+
+static struct clksrc_sources clk_src_d1sync = {
+	.sources	= clk_src_d1sync_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_d1sync_list),
+};
+
+static struct clksrc_clk clk_mout_d1sync = {
+	.clk	= {
+		.name		= "mout_d1sync",
+		.id		= -1,
+	},
+	.sources	= &clk_src_d1sync,
+	.reg_src	= { .reg = S5P_CLK_MUX_STAT1, .shift = 24, .size = 3 },
+};
+
+static struct clk clk_hclkd0 = {
+	.name		= "hclkd0",
+	.id		= -1,
+	.parent		= &clk_mout_d0sync.clk,
+};
+
+static struct clk clk_hclkd1 = {
+	.name		= "hclkd1",
+	.id		= -1,
+	.parent		= &clk_mout_d1sync.clk,
+};
+
+static struct clk clk_pclkd0 = {
+	.name		= "pclkd0",
+	.id		= -1,
+	.parent		= &clk_hclkd0,
+};
+
+static struct clk clk_pclkd1 = {
+	.name		= "pclkd1",
+	.id		= -1,
+	.parent		= &clk_hclkd1,
+};
+
+int s5p6442_clk_ip3_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLKGATE_IP3, clk, enable);
+}
+
+static struct clksrc_clk clksrcs[] = {
+	{
+		.clk	= {
+			.name		= "dout_a2m",
+			.id		= -1,
+			.parent		= &clk_mout_apll.clk,
+		},
+		.sources = &clk_src_apll,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 4, .size = 3 },
+	}, {
+		.clk	= {
+			.name		= "dout_apll",
+			.id		= -1,
+			.parent		= &clk_mout_arm.clk,
+		},
+		.sources = &clk_src_arm,
+		.reg_src = { .reg = S5P_CLK_MUX_STAT0, .shift = 16, .size = 3 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 0, .size = 3 },
+	}, {
+		.clk	= {
+			.name		= "hclkd1",
+			.id		= -1,
+			.parent		= &clk_mout_d1sync.clk,
+		},
+		.sources = &clk_src_d1sync,
+		.reg_src = { .reg = S5P_CLK_MUX_STAT1, .shift = 24, .size = 3 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 24, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "hclkd0",
+			.id		= -1,
+			.parent		= &clk_mout_d0sync.clk,
+		},
+		.sources = &clk_src_d0sync,
+		.reg_src = { .reg = S5P_CLK_MUX_STAT1, .shift = 28, .size = 3 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 16, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "pclkd0",
+			.id		= -1,
+			.parent		= &clk_hclkd0,
+		},
+		.sources = &clk_src_d0sync,
+		.reg_src = { .reg = S5P_CLK_MUX_STAT1, .shift = 28, .size = 3 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 20, .size = 3 },
+	}, {
+		.clk	= {
+			.name		= "pclkd1",
+			.id		= -1,
+			.parent		= &clk_hclkd1,
+		},
+		.sources = &clk_src_d1sync,
+		.reg_src = { .reg = S5P_CLK_MUX_STAT1, .shift = 24, .size = 3 },
+		.reg_div = { .reg = S5P_CLK_DIV0, .shift = 28, .size = 3 },
+	}
+};
+
+/* Clock initialisation code */
+static struct clksrc_clk *init_parents[] = {
+	&clk_mout_apll,
+	&clk_mout_mpll,
+	&clk_mout_epll,
+	&clk_mout_arm,
+	&clk_mout_d0,
+	&clk_mout_d0sync,
+	&clk_mout_d1,
+	&clk_mout_d1sync,
+};
+
+void __init_or_cpufreq s5p6442_setup_clocks(void)
+{
+	struct clk *pclkd0_clk;
+	struct clk *pclkd1_clk;
+
+	unsigned long xtal;
+	unsigned long arm;
+	unsigned long hclkd0 = 0;
+	unsigned long hclkd1 = 0;
+	unsigned long pclkd0 = 0;
+	unsigned long pclkd1 = 0;
+
+	unsigned long apll;
+	unsigned long mpll;
+	unsigned long epll;
+	unsigned int ptr;
+
+	printk(KERN_DEBUG "%s: registering clocks\n", __func__);
+
+	xtal = clk_get_rate(&clk_xtal);
+
+	printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
+
+	apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4508);
+	mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502);
+	epll = s5p_get_pll45xx(xtal, __raw_readl(S5P_EPLL_CON), pll_4500);
+
+	printk(KERN_INFO "S5P6440: PLL settings, A=%ld, M=%ld, E=%ld",
+			apll, mpll, epll);
+
+	clk_fout_apll.rate = apll;
+	clk_fout_mpll.rate = mpll;
+	clk_fout_epll.rate = epll;
+
+	for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
+		s3c_set_clksrc(init_parents[ptr], true);
+
+	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
+		s3c_set_clksrc(&clksrcs[ptr], true);
+
+	arm = clk_get_rate(&clk_dout_apll);
+	hclkd0 = clk_get_rate(&clk_hclkd0);
+	hclkd1 = clk_get_rate(&clk_hclkd1);
+
+	pclkd0_clk = clk_get(NULL, "pclkd0");
+	BUG_ON(IS_ERR(pclkd0_clk));
+
+	pclkd0 = clk_get_rate(pclkd0_clk);
+	clk_put(pclkd0_clk);
+
+	pclkd1_clk = clk_get(NULL, "pclkd1");
+	BUG_ON(IS_ERR(pclkd1_clk));
+
+	pclkd1 = clk_get_rate(pclkd1_clk);
+	clk_put(pclkd1_clk);
+
+	printk(KERN_INFO "S5P6442: HCLKD0=%ld, HCLKD1=%ld, PCLKD0=%ld, PCLKD1=%ld\n",
+			hclkd0, hclkd1, pclkd0, pclkd1);
+
+	/* For backward compatibility */
+	clk_f.rate = arm;
+	clk_h.rate = hclkd1;
+	clk_p.rate = pclkd1;
+
+	clk_pclkd0.rate = pclkd0;
+	clk_pclkd1.rate = pclkd1;
+}
+
+static struct clk init_clocks[] = {
+	{
+		.name		= "systimer",
+		.id		= -1,
+		.parent		= &clk_pclkd1,
+		.enable		= s5p6442_clk_ip3_ctrl,
+		.ctrlbit	= (1<<16),
+	}, {
+		.name		= "uart",
+		.id		= 0,
+		.parent		= &clk_pclkd1,
+		.enable		= s5p6442_clk_ip3_ctrl,
+		.ctrlbit	= (1<<17),
+	}, {
+		.name		= "uart",
+		.id		= 1,
+		.parent		= &clk_pclkd1,
+		.enable		= s5p6442_clk_ip3_ctrl,
+		.ctrlbit	= (1<<18),
+	}, {
+		.name		= "uart",
+		.id		= 2,
+		.parent		= &clk_pclkd1,
+		.enable		= s5p6442_clk_ip3_ctrl,
+		.ctrlbit	= (1<<19),
+	}, {
+		.name		= "timers",
+		.id		= -1,
+		.parent		= &clk_pclkd1,
+		.enable		= s5p6442_clk_ip3_ctrl,
+		.ctrlbit	= (1<<23),
+	},
+};
+
+static struct clk *clks[] __initdata = {
+	&clk_ext,
+	&clk_epll,
+	&clk_mout_apll.clk,
+	&clk_mout_mpll.clk,
+	&clk_mout_epll.clk,
+	&clk_mout_d0.clk,
+	&clk_mout_d0sync.clk,
+	&clk_mout_d1.clk,
+	&clk_mout_d1sync.clk,
+	&clk_hclkd0,
+	&clk_pclkd0,
+	&clk_hclkd1,
+	&clk_pclkd1,
+};
+
+void __init s5p6442_register_clocks(void)
+{
+	s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
+
+	s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
+	s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
+
+	s3c_pwmclk_init();
+}