ARM: S3C2416: Add basic clock support

Add basic clock support for the PLLs, HSMMC channels and
PWM clocks. This is enough to get a basic system up and
running.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

5 files changed, 165 insertions, 1 deletions

diff --git a/arch/arm/mach-s3c2410/include/mach/regs-clock.h b/arch/arm/mach-s3c2410/include/mach/regs-clock.h
index 9a0d169be137..3415b60082d7 100644
--- a/arch/arm/mach-s3c2410/include/mach/regs-clock.h
+++ b/arch/arm/mach-s3c2410/include/mach/regs-clock.h
@@ -161,4 +161,6 @@
 
 #endif /* CONFIG_CPU_S3C2412 | CONFIG_CPU_S3C2413 */
 
+#define S3C2416_CLKDIV2         S3C2410_CLKREG(0x28)
+
 #endif /* __ASM_ARM_REGS_CLOCK */
diff --git a/arch/arm/mach-s3c2416/Kconfig b/arch/arm/mach-s3c2416/Kconfig
index 528f27348b68..677f963ee49e 100644
--- a/arch/arm/mach-s3c2416/Kconfig
+++ b/arch/arm/mach-s3c2416/Kconfig
@@ -10,6 +10,8 @@ config CPU_S3C2416
         select CPU_ARM926T
         select S3C2416_DMA if S3C2410_DMA
         select CPU_LLSERIAL_S3C2440
+        select SAMSUNG_CLKSRC
+        select S3C2443_CLOCK
         help
           Support for the S3C2416 SoC from the S3C24XX line
 
diff --git a/arch/arm/mach-s3c2416/Makefile b/arch/arm/mach-s3c2416/Makefile
index 9183e81037ca..6c12c7bf40ad 100644
--- a/arch/arm/mach-s3c2416/Makefile
+++ b/arch/arm/mach-s3c2416/Makefile
@@ -9,7 +9,7 @@ obj-m				:=
 obj-n                           :=
 obj-                            :=
 
-obj-$(CONFIG_CPU_S3C2416)       += s3c2416.o
+obj-$(CONFIG_CPU_S3C2416)       += s3c2416.o clock.o
 obj-$(CONFIG_CPU_S3C2416)       += irq.o
 
 #obj-$(CONFIG_S3C2416_DMA)      += dma.o
diff --git a/arch/arm/mach-s3c2416/clock.c b/arch/arm/mach-s3c2416/clock.c
new file mode 100644
index 000000000000..7ccf5a2a2bfc
--- /dev/null
+++ b/arch/arm/mach-s3c2416/clock.c
@@ -0,0 +1,135 @@
+/* linux/arch/arm/mach-s3c2416/clock.c
+ *
+ * Copyright (c) 2010 Simtec Electronics
+ * Copyright (c) 2010 Ben Dooks <ben-linux@fluff.org>
+ *
+ * S3C2416 Clock control support
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/clk.h>
+
+#include <plat/s3c2416.h>
+#include <plat/s3c2443.h>
+#include <plat/clock.h>
+#include <plat/clock-clksrc.h>
+#include <plat/cpu.h>
+
+#include <plat/cpu-freq.h>
+#include <plat/pll6553x.h>
+#include <plat/pll.h>
+
+#include <asm/mach/map.h>
+
+#include <mach/regs-clock.h>
+#include <mach/regs-s3c2443-clock.h>
+
+static unsigned int armdiv[8] = {
+        [0] = 1,
+        [1] = 2,
+        [2] = 3,
+        [3] = 4,
+        [5] = 6,
+        [7] = 8,
+};
+
+/* ID to hardware numbering, 0 is HSMMC1, 1 is HSMMC0 */
+static struct clksrc_clk hsmmc_div[] = {
+        [0] = {
+                .clk = {
+                        .name   = "hsmmc-div",
+                        .id     = 1,
+                        .parent = &clk_esysclk.clk,
+                },
+                .reg_div = { .reg = S3C2416_CLKDIV2, .size = 2, .shift = 6 },
+        },
+        [1] = {
+                .clk = {
+                        .name   = "hsmmc-div",
+                        .id     = 0,
+                        .parent = &clk_esysclk.clk,
+                },
+                .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 },
+        },
+};
+
+static struct clksrc_clk hsmmc_mux[] = {
+        [0] = {
+                .clk    = {
+                        .id     = 1,
+                        .name   = "hsmmc-if",
+                        .ctrlbit = (1 << 6),
+                        .enable = s3c2443_clkcon_enable_s,
+                },
+                .sources = &(struct clksrc_sources) {
+                        .nr_sources = 2,
+                        .sources = (struct clk *[]) {
+                                [0] = &hsmmc_div[0].clk,
+                                [1] = NULL, /* to fix */
+                        },
+                },
+                .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 16 },
+        },
+        [1] = {
+                .clk    = {
+                        .id     = 0,
+                        .name   = "hsmmc-if",
+                        .ctrlbit = (1 << 12),
+                        .enable = s3c2443_clkcon_enable_s,
+                },
+                .sources = &(struct clksrc_sources) {
+                        .nr_sources = 2,
+                        .sources = (struct clk *[]) {
+                                [0] = &hsmmc_div[1].clk,
+                                [1] = NULL, /* to fix */
+                        },
+                },
+                .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 17 },
+        },
+};
+
+
+static inline unsigned int s3c2416_fclk_div(unsigned long clkcon0)
+{
+        clkcon0 &= 7 << S3C2443_CLKDIV0_ARMDIV_SHIFT;
+
+        return armdiv[clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT];
+}
+
+void __init_or_cpufreq s3c2416_setup_clocks(void)
+{
+        s3c2443_common_setup_clocks(s3c2416_get_pll, s3c2416_fclk_div);
+}
+
+
+static struct clksrc_clk *clksrcs[] __initdata = {
+        &hsmmc_div[0],
+        &hsmmc_div[1],
+        &hsmmc_mux[0],
+        &hsmmc_mux[1],
+};
+
+void __init s3c2416_init_clocks(int xtal)
+{
+        u32 epllcon = __raw_readl(S3C2443_EPLLCON);
+        u32 epllcon1 = __raw_readl(S3C2443_EPLLCON+4);
+        int ptr;
+
+        /* s3c2416 EPLL compatible with s3c64xx */
+        clk_epll.rate = s3c_get_pll6553x(xtal, epllcon, epllcon1);
+
+        clk_epll.parent = &clk_epllref.clk;
+
+        s3c2443_common_init_clocks(xtal, s3c2416_get_pll, s3c2416_fclk_div);
+
+        for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
+                s3c_register_clksrc(clksrcs[ptr], 1);
+
+        s3c_pwmclk_init();
+
+}
diff --git a/arch/arm/plat-s3c24xx/include/plat/pll.h b/arch/arm/plat-s3c24xx/include/plat/pll.h
index 7ea8bffa7a9c..005729a1077a 100644
--- a/arch/arm/plat-s3c24xx/include/plat/pll.h
+++ b/arch/arm/plat-s3c24xx/include/plat/pll.h
@@ -35,3 +35,28 @@ s3c24xx_get_pll(unsigned int pllval, unsigned int baseclk)
 
         return (unsigned int)fvco;
 }
+
+#define S3C2416_PLL_M_SHIFT     (14)
+#define S3C2416_PLL_P_SHIFT     (5)
+#define S3C2416_PLL_S_MASK      (7)
+#define S3C2416_PLL_M_MASK      ((1 << 10) - 1)
+#define S3C2416_PLL_P_MASK      (63)
+
+static inline unsigned int
+s3c2416_get_pll(unsigned int pllval, unsigned int baseclk)
+{
+        unsigned int m, p, s;
+        uint64_t fvco;
+
+        m = pllval >> S3C2416_PLL_M_SHIFT;
+        p = pllval >> S3C2416_PLL_P_SHIFT;
+
+        s = pllval & S3C2416_PLL_S_MASK;
+        m &= S3C2416_PLL_M_MASK;
+        p &= S3C2416_PLL_P_MASK;
+
+        fvco = (uint64_t)baseclk * m;
+        do_div(fvco, (p << s));
+
+        return (unsigned int)fvco;
+}