diff options
Diffstat (limited to 'arch/arm/mach-s3c24xx/clock-s3c2416.c')
| -rw-r--r-- | arch/arm/mach-s3c24xx/clock-s3c2416.c | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/arch/arm/mach-s3c24xx/clock-s3c2416.c b/arch/arm/mach-s3c24xx/clock-s3c2416.c new file mode 100644 index 00000000000..5e36905eb7f --- /dev/null +++ b/arch/arm/mach-s3c24xx/clock-s3c2416.c @@ -0,0 +1,178 @@ +/* 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/clock.h> +#include <plat/clock-clksrc.h> +#include <plat/cpu.h> + +#include <plat/cpu-freq.h> +#include <plat/pll.h> + +#include <asm/mach/map.h> + +#include <mach/regs-clock.h> +#include <mach/regs-s3c2443-clock.h> + +/* armdiv + * + * this clock is sourced from msysclk and can have a number of + * divider values applied to it to then be fed into armclk. + * The real clock definition is done in s3c2443-clock.c, + * only the armdiv divisor table must be defined here. +*/ + +static unsigned int armdiv[8] = { + [0] = 1, + [1] = 2, + [2] = 3, + [3] = 4, + [5] = 6, + [7] = 8, +}; + +static struct clksrc_clk hsspi_eplldiv = { + .clk = { + .name = "hsspi-eplldiv", + .parent = &clk_esysclk.clk, + .ctrlbit = (1 << 14), + .enable = s3c2443_clkcon_enable_s, + }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 24 }, +}; + +static struct clk *hsspi_sources[] = { + [0] = &hsspi_eplldiv.clk, + [1] = NULL, /* to fix */ +}; + +static struct clksrc_clk hsspi_mux = { + .clk = { + .name = "hsspi-if", + }, + .sources = &(struct clksrc_sources) { + .sources = hsspi_sources, + .nr_sources = ARRAY_SIZE(hsspi_sources), + }, + .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 18 }, +}; + +static struct clksrc_clk hsmmc_div[] = { + [0] = { + .clk = { + .name = "hsmmc-div", + .devname = "s3c-sdhci.0", + .parent = &clk_esysclk.clk, + }, + .reg_div = { .reg = S3C2416_CLKDIV2, .size = 2, .shift = 6 }, + }, + [1] = { + .clk = { + .name = "hsmmc-div", + .devname = "s3c-sdhci.1", + .parent = &clk_esysclk.clk, + }, + .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 }, + }, +}; + +static struct clksrc_clk hsmmc_mux0 = { + .clk = { + .name = "hsmmc-if", + .devname = "s3c-sdhci.0", + .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 }, +}; + +static struct clksrc_clk hsmmc_mux1 = { + .clk = { + .name = "hsmmc-if", + .devname = "s3c-sdhci.1", + .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 struct clk hsmmc0_clk = { + .name = "hsmmc", + .devname = "s3c-sdhci.0", + .parent = &clk_h, + .enable = s3c2443_clkcon_enable_h, + .ctrlbit = S3C2416_HCLKCON_HSMMC0, +}; + +void __init_or_cpufreq s3c2416_setup_clocks(void) +{ + s3c2443_common_setup_clocks(s3c2416_get_pll); +} + + +static struct clksrc_clk *clksrcs[] __initdata = { + &hsspi_eplldiv, + &hsspi_mux, + &hsmmc_div[0], + &hsmmc_div[1], + &hsmmc_mux0, + &hsmmc_mux1, +}; + +static struct clk_lookup s3c2416_clk_lookup[] = { + CLKDEV_INIT("s3c-sdhci.0", "mmc_busclk.0", &hsmmc0_clk), + CLKDEV_INIT("s3c-sdhci.0", "mmc_busclk.2", &hsmmc_mux0.clk), + CLKDEV_INIT("s3c-sdhci.1", "mmc_busclk.2", &hsmmc_mux1.clk), +}; + +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, + armdiv, ARRAY_SIZE(armdiv), + S3C2416_CLKDIV0_ARMDIV_MASK); + + for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++) + s3c_register_clksrc(clksrcs[ptr], 1); + + s3c24xx_register_clock(&hsmmc0_clk); + clkdev_add_table(s3c2416_clk_lookup, ARRAY_SIZE(s3c2416_clk_lookup)); + + s3c_pwmclk_init(); + +} |