[PATCH 10/15] ARM: S3C2416: Add basic clock support
Ben Dooks
ben-linux at fluff.org
Tue May 11 22:36:01 EDT 2010
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 at fluff.org>
---
arch/arm/mach-s3c2410/include/mach/regs-clock.h | 2 +
arch/arm/mach-s3c2416/Kconfig | 2 +
arch/arm/mach-s3c2416/Makefile | 2 +-
arch/arm/mach-s3c2416/clock.c | 135 +++++++++++++++++++++++
arch/arm/plat-s3c24xx/include/plat/pll.h | 25 ++++
5 files changed, 165 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-s3c2416/clock.c
diff --git a/arch/arm/mach-s3c2410/include/mach/regs-clock.h b/arch/arm/mach-s3c2410/include/mach/regs-clock.h
index 9a0d169..3415b60 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 528f273..677f963 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 9183e81..6c12c7b 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 0000000..7ccf5a2
--- /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 at 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 7ea8bff..005729a 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;
+}
--
1.6.3.3
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