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author | Alexey Galakhov <agalakhov@gmail.com> | 2012-05-18 15:43:29 +0600 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-05-21 21:58:26 +0200 |
commit | df033b9f594417eb3552999dfb64fc1c917bd96c (patch) | |
tree | 0b9cbffa7fe177b13b09a09ed01f55905afefdbb /arch | |
parent | d1e782ed959b8d936102b1540f5f7513a0a84590 (diff) | |
download | barebox-df033b9f594417eb3552999dfb64fc1c917bd96c.tar.gz barebox-df033b9f594417eb3552999dfb64fc1c917bd96c.tar.xz |
S5P lowlevel clock init
Signed-off-by: Alexey Galakhov <agalakhov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/mach-samsung/Makefile | 1 | ||||
-rw-r--r-- | arch/arm/mach-samsung/include/mach/s3c-generic.h | 4 | ||||
-rw-r--r-- | arch/arm/mach-samsung/lowlevel-s5pcxx.c | 61 |
3 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm/mach-samsung/Makefile b/arch/arm/mach-samsung/Makefile index 0b95e145e3..d7344c89fc 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-$(CONFIG_ARCH_S3C24xx) += gpio-s3c24x0.o s3c24xx-clocks.o mem-s3c24x0.o obj-$(CONFIG_ARCH_S5PCxx) += gpio-s5pcxx.o clocks-s5pcxx.o obj-$(CONFIG_S3C_LOWLEVEL_INIT) += $(obj-lowlevel-y) diff --git a/arch/arm/mach-samsung/include/mach/s3c-generic.h b/arch/arm/mach-samsung/include/mach/s3c-generic.h index 9d40ef8dfe..11b083d4a8 100644 --- a/arch/arm/mach-samsung/include/mach/s3c-generic.h +++ b/arch/arm/mach-samsung/include/mach/s3c-generic.h @@ -37,3 +37,7 @@ unsigned s3c_get_uart_clk(unsigned src); uint32_t s3c24xx_get_memory_size(void); void s3c24xx_disable_second_sdram_bank(void); #endif + +#ifdef CONFIG_ARCH_S5PCxx +void s5p_init_pll(void); +#endif diff --git a/arch/arm/mach-samsung/lowlevel-s5pcxx.c b/arch/arm/mach-samsung/lowlevel-s5pcxx.c new file mode 100644 index 0000000000..15afa47ce3 --- /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 */ |