[PATCH 6/9] S5P lowlevel clock init

From: Alexey Galakhov <agalakhov@gmail.com>
To: barebox@lists.infradead.org
Cc: Alexey Galakhov <agalakhov@gmail.com>
Subject: [PATCH 6/9] S5P lowlevel clock init
Date: Sun, 13 May 2012 18:40:03 +0600	[thread overview]
Message-ID: <1336912806-4163-7-git-send-email-agalakhov@gmail.com> (raw)
In-Reply-To: <1336912806-4163-1-git-send-email-agalakhov@gmail.com>

Signed-off-by: Alexey Galakhov <agalakhov@gmail.com>
---
 arch/arm/boards/tiny210/config.h                 |   13 +++++
 arch/arm/boards/tiny210/lowlevel.c               |    4 +-
 arch/arm/mach-samsung/Makefile                   |    1 +
 arch/arm/mach-samsung/include/mach/s3c-generic.h |    1 +
 arch/arm/mach-samsung/lowlevel-s5pcxx.c          |   61 ++++++++++++++++++++++
 5 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/mach-samsung/lowlevel-s5pcxx.c

diff --git a/arch/arm/boards/tiny210/config.h b/arch/arm/boards/tiny210/config.h
index 83cb0b4..36f0601 100644
--- a/arch/arm/boards/tiny210/config.h
+++ b/arch/arm/boards/tiny210/config.h
@@ -8,3 +8,16 @@
 #define DMC_TIMING_ROW	0x2B34438A
 #define DMC_TIMING_DATA	0x24240000
 #define DMC_TIMING_PWR	0x0BDC0343
+
+#define set_pll(mdiv, pdiv, sdiv)	(1<<31 | mdiv<<16 | pdiv<<8 | sdiv)
+
+#define BOARD_APLL_VAL	set_pll(0x7d, 0x3, 0x1)
+#define BOARD_MPLL_VAL	set_pll(0x29b, 0xc, 0x1)
+#define BOARD_EPLL_VAL	set_pll(0x60, 0x6, 0x2)
+#define BOARD_VPLL_VAL	set_pll(0x6c, 0x6, 0x3)
+
+#define BOARD_CLK_DIV0_MASK	0xFFFFFFFF
+#define BOARD_CLK_DIV0_VAL	0x14131440
+#define BOARD_APLL_LOCKTIME	0x2cf
+
+
diff --git a/arch/arm/boards/tiny210/lowlevel.c b/arch/arm/boards/tiny210/lowlevel.c
index dcf4091..344be6a 100644
--- a/arch/arm/boards/tiny210/lowlevel.c
+++ b/arch/arm/boards/tiny210/lowlevel.c
@@ -32,7 +32,9 @@ void __bare_init board_init_lowlevel(void)
 {
 	unsigned r;
 
-	/* TODO: initialize PLL here */
+#ifdef CONFIG_S3C_PLL_INIT
+	s5p_init_pll();
+#endif
 
 	if (get_pc() < 0xD0000000) /* Are we running from iRAM? */
 		return; /* No, we don't. */
diff --git a/arch/arm/mach-samsung/Makefile b/arch/arm/mach-samsung/Makefile
index ac59d7b..becf2a7 100644
--- a/arch/arm/mach-samsung/Makefile
+++ b/arch/arm/mach-samsung/Makefile
@@ -1,5 +1,6 @@
 obj-y += s3c-timer.o generic.o
 obj-lowlevel-$(CONFIG_ARCH_S3C24xx) += lowlevel-s3c24x0.o
+obj-lowlevel-$(CONFIG_ARCH_S5PCxx) += lowlevel-s5pcxx.o
 obj-$(CONFIG_ARCH_S3C24xx) += gpio-s3c24x0.o clocks-s3c24x0.o mem-s3c24x0.o
 obj-$(CONFIG_ARCH_S5PCxx) += gpio-s5pcxx.o clocks-s5pcxx.o mem-s5pcxx.o
 obj-$(CONFIG_ARCH_S5PCxx) += s5p-irom-boot.o
diff --git a/arch/arm/mach-samsung/include/mach/s3c-generic.h b/arch/arm/mach-samsung/include/mach/s3c-generic.h
index 381ad7b..53bb95d 100644
--- a/arch/arm/mach-samsung/include/mach/s3c-generic.h
+++ b/arch/arm/mach-samsung/include/mach/s3c-generic.h
@@ -40,6 +40,7 @@ void s3c24xx_disable_second_sdram_bank(void);
 #endif
 
 #ifdef CONFIG_ARCH_S5PCxx
+void s5p_init_pll(void);
 void s5p_init_dram_bank(uint32_t base, uint32_t mc0, uint32_t mc1);
 int s5p_irom_mmc_load(void *dest, uint32_t start_block, uint16_t block_count);
 #endif
diff --git a/arch/arm/mach-samsung/lowlevel-s5pcxx.c b/arch/arm/mach-samsung/lowlevel-s5pcxx.c
new file mode 100644
index 0000000..15afa47
--- /dev/null
+++ b/arch/arm/mach-samsung/lowlevel-s5pcxx.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2012 Alexey Galakhov
+ *
+ * Based on code from u-boot found somewhere on the web
+ * that seems to originate from Samsung
+ *
+ * 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.
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <io.h>
+#include <init.h>
+#include <mach/s3c-iomap.h>
+#include <mach/s3c-clocks.h>
+#include <mach/s3c-generic.h>
+
+#ifdef CONFIG_S3C_PLL_INIT
+void  __bare_init s5p_init_pll(void)
+{
+    uint32_t reg;
+    int i;
+
+    /* Set Mux to FIN */
+    writel(0, S5P_CLK_SRC0);
+
+    writel(BOARD_APLL_LOCKTIME, S5P_xPLL_LOCK + S5P_APLL);
+
+    /* Disable PLL */
+    writel(0, S5P_xPLL_CON + S5P_APLL);
+    writel(0, S5P_xPLL_CON + S5P_MPLL);
+
+    /* Set up dividers */
+    reg = readl(S5P_CLK_DIV0);
+    reg &= ~(BOARD_CLK_DIV0_MASK);
+    reg |= (BOARD_CLK_DIV0_VAL);
+    writel(reg, S5P_CLK_DIV0);
+
+    /* Set up PLLs */
+    writel(BOARD_APLL_VAL, S5P_xPLL_CON + S5P_APLL);
+    writel(BOARD_MPLL_VAL, S5P_xPLL_CON + S5P_MPLL);
+    writel(BOARD_EPLL_VAL, S5P_xPLL_CON + S5P_EPLL);
+    writel(BOARD_VPLL_VAL, S5P_xPLL_CON + S5P_VPLL);
+
+    /* Wait for sync */
+    for (i = 0; i < 0x10000; ++i)
+        barrier();
+
+    reg = readl(S5P_CLK_SRC0);
+    reg |= 0x1111; /* switch MUX to PLL outputs */
+    writel(reg, S5P_CLK_SRC0);
+}
+#endif /* CONFIG_S3C_PLL_INIT */
-- 
1.7.10


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