/* linux/arch/arm/plat-s3c64xx/s3c6400-clock.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C6400 based common clock support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/sysdev.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <mach/map.h>
#include <plat/cpu-freq.h>
#include <plat/regs-clock.h>
#include <plat/clock.h>
#include <plat/clock-clksrc.h>
#include <plat/cpu.h>
#include <plat/pll.h>
/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
* ext_xtal_mux for want of an actual name from the manual.
*/
static struct clk clk_ext_xtal_mux = {
.name = "ext_xtal",
.id = -1,
};
#define clk_fin_apll clk_ext_xtal_mux
#define clk_fin_mpll clk_ext_xtal_mux
#define clk_fin_epll clk_ext_xtal_mux
#define clk_fout_mpll clk_mpll
#define clk_fout_epll clk_epll
static struct clk clk_fout_apll = {
.name = "fout_apll",
.id = -1,
};
static struct clk *clk_src_apll_list[] = {
[0] = &clk_fin_apll,
[1] = &clk_fout_apll,
};
static struct clksrc_sources clk_src_apll = {
.sources = clk_src_apll_list,
.nr_sources = ARRAY_SIZE(clk_src_apll_list),
};
static struct clksrc_clk clk_mout_apll = {
.clk = {
.name = "mout_apll",
.id = -1,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 0, .size = 1 },
.sources = &clk_src_apll,
};
static struct clk *clk_src_epll_list[] = {
[0] = &clk_fin_epll,
[1] = &clk_fout_epll,
};
static struct clksrc_sources clk_src_epll = {
.sources = clk_src_epll_list,
.nr_sources = ARRAY_SIZE(clk_src_epll_list),
};
static struct clksrc_clk clk_mout_epll = {
.clk = {
.name = "mout_epll",
.id = -1,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 2, .size = 1 },
.sources = &clk_src_epll,
};
static struct clk *clk_src_mpll_list[] = {
[0] = &clk_fin_mpll,
[1] = &clk_fout_mpll,
};
static struct clksrc_sources clk_src_mpll = {
.sources = clk_src_mpll_list,
.nr_sources = ARRAY_SIZE(clk_src_mpll_list),
};
static struct clksrc_clk clk_mout_mpll = {
.clk = {
.name = "mout_mpll",
.id = -1,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 1, .size = 1 },
.sources = &clk_src_mpll,
};
static unsigned int armclk_mask;
static unsigned long s3c64xx_clk_arm_get_rate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
u32 clkdiv;
/* divisor mask starts at bit0, so no need to shift */
clkdiv = __raw_readl(S3C_CLK_DIV0) & armclk_mask;
return rate / (clkdiv + 1);
}
static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
u32 div;
if (parent < rate)
return parent;
div = (parent / rate) - 1;
if (div > armclk_mask)
div = armclk_mask;
return parent / (div + 1);
}
static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
u32 div;
u32 val;
if (rate < parent / (armclk_mask + 1))
return -EINVAL;
rate = clk_round_rate(clk, rate);
div = clk_get_rate(clk->parent) / rate;
val = __raw_readl(S3C_CLK_DIV0);
val &= ~armclk_mask;
val |= (div - 1);
__raw_writel(val, S3C_CLK_DIV0);
return 0;
}
static struct clk clk_arm = {
.name = "armclk",
.id = -1,
.parent = &clk_mout_apll.clk,
.ops = &(struct clk_ops) {
.get_rate = s3c64xx_clk_arm_get_rate,
.set_rate = s3c64xx_clk_arm_set_rate,
.round_rate = s3c64xx_clk_arm_round_rate,
},
};
static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);
if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
rate /= 2;
return rate;
}
static struct clk_ops clk_dout_ops = {
.get_rate = s3c64xx_clk_doutmpll_get_rate,
};
static struct clk clk_dout_mpll = {
.name = "dout_mpll",
.id = -1,
.parent = &clk_mout_mpll.clk,
.ops = &clk_dout_ops,
};
static struct clk *clkset_spi_mmc_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
&clk_fin_epll,
&clk_27m,
};
static struct clksrc_sources clkset_spi_mmc = {
.sources = clkset_spi_mmc_list,
.nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
};
static struct clk *clkset_irda_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
NULL,
&clk_27m,
};
static struct clksrc_sources clkset_irda = {
.sources = clkset_irda_list,
.nr_sources = ARRAY_SIZE(clkset_irda_list),
};
static struct clk *clkset_uart_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll,
NULL,
NULL
};
static struct clksrc_sources clkset_uart = {
.sources = clkset_uart_list,
.nr_sources = ARRAY_SIZE(clkset_uart_list),
};
static struct clk *clkset_uhost_list[] = {
&clk_48m,
&clk_mout_epll.clk,
&clk_dout_mpll,
&clk_fin_epll,
};
static struct clksrc_sources clkset_uhost = {
.sources = clkset_uhost_list,
.nr_sources = ARRAY_SIZE(clkset_uhost_list),
};
/* The peripheral clocks are all controlled via clocksource followed
* by an optional divider and gate stage. We currently roll this into
* one clock which hides the intermediate clock from the mux.
*
* Note, the JPEG clock can only be an even divider...
*
* The scaler and LCD clocks depend on the S3C64XX version, and also
* have a common parent divisor so are not included here.
*/
/* clocks that feed other parts of the clock source tree */
static struct clk clk_iis_cd0 = {
.name = "iis_cdclk0",
.id = -1,
};
static struct clk clk_iis_cd1 = {
.name = "iis_cdclk1",
.id = -1,
};
static struct clk clk_pcm_cd = {
.name = "pcm_cdclk",
.id = -1,
};
static struct clk *clkset_audio0_list[] = {
[0] = &clk_mout_epll.clk,
[1] = &clk_dout_mpll,
[2] = &clk_fin_epll,
[3] = &clk_iis_cd0,
[4] = &clk_pcm_cd,
};
static struct clksrc_sources clkset_audio0 = {
.sources = clkset_audio0_list,
.nr_sources = ARRAY_SIZE(clkset_audio0_list),
};
static struct clk *clkset_audio1_list[] = {
[0] = &clk_mout_epll.clk,
[1] = &clk_dout_mpll,
[2] = &clk_fin_epll,
[3] = &clk_iis_cd1,
[4] = &clk_pcm_cd,
};
static struct clksrc_sources clkset_audio1 = {
.sources = clkset_audio1_list,
.nr_sources = ARRAY_SIZE(clkset_audio1_list),
};
static struct clk *clkset_camif_list[] = {
&clk_h2,
};
static struct clksrc_sources clkset_camif = {
.sources = clkset_camif_list,
.nr_sources = ARRAY_SIZE(clkset_camif_list),
};
static struct clksrc_clk clksrcs[] = {
{
.clk = {
.name = "mmc_bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_MMC0,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 18, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV1, .shift = 0, .size = 4 },
.sources = &clkset_spi_mmc,
}, {
.clk = {
.name = "mmc_bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_MMC1,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 20, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV1, .shift = 4, .size = 4 },
.sources = &clkset_spi_mmc,
}, {
.clk = {
.name = "mmc_bus",
.id = 2,
.ctrlbit = S3C_CLKCON_SCLK_MMC2,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 22, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV1, .shift = 8, .size = 4 },
.sources = &clkset_spi_mmc,
}, {
.clk = {
.name = "usb-bus-host",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_UHOST,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 5, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV1, .shift = 20, .size = 4 },
.sources = &clkset_uhost,
}, {
.clk = {
.name = "uclk1",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_UART,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 13, .size = 1 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 16, .size = 4 },
.sources = &clkset_uart,
}, {
/* Where does UCLK0 come from? */
.clk = {
.name = "spi-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_SPI0,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 14, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 0, .size = 4 },
.sources = &clkset_spi_mmc,
}, {
.clk = {
.name = "spi-bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_SPI1,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 16, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 4, .size = 4 },
.sources = &clkset_spi_mmc,
}, {
.clk = {
.name = "audio-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_AUDIO0,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 7, .size = 3 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 8, .size = 4 },
.sources = &clkset_audio0,
}, {
.clk = {
.name = "audio-bus",
.id = 1,
.ctrlbit = S3C_CLKCON_SCLK_AUDIO1,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 10, .size = 3 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 12, .size = 4 },
.sources = &clkset_audio1,
}, {
.clk = {
.name = "irda-bus",
.id = 0,
.ctrlbit = S3C_CLKCON_SCLK_IRDA,
.enable = s3c64xx_sclk_ctrl,
},
.reg_src = { .reg = S3C_CLK_SRC, .shift = 24, .size = 2 },
.reg_div = { .reg = S3C_CLK_DIV2, .shift = 20, .size = 4 },
.sources = &clkset_irda,
}, {
.clk = {
.name = "camera",
.id = -1,
.ctrlbit = S3C_CLKCON_SCLK_CAM,
.enable = s3c64xx_sclk_ctrl,
},
.reg_div = { .reg = S3C_CLK_DIV0, .shift = 20, .size = 4 },
.reg_src = { .reg = NULL, .shift = 0, .size = 0 },
.sources = &clkset_camif,
},
};
/* Clock initialisation code */
static struct clksrc_clk *init_parents[] = {
&clk_mout_apll,
&clk_mout_epll,
&clk_mout_mpll,
};
#define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)
void __init_or_cpufreq s3c6400_setup_clocks(void)
{
struct clk *xtal_clk;
unsigned long xtal;
unsigned long fclk;
unsigned long hclk;
unsigned long hclk2;
unsigned long pclk;
unsigned long epll;
unsigned long apll;
unsigned long mpll;
unsigned int ptr;
u32 clkdiv0;
printk(KERN_DEBUG "%s: registering clocks\n", __func__);
clkdiv0 = __raw_readl(S3C_CLK_DIV0);
printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);
xtal_clk = clk_get(NULL, "xtal");
BUG_ON(IS_ERR(xtal_clk));
xtal = clk_get_rate(xtal_clk);
clk_put(xtal_clk);
printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
/* For now assume the mux always selects the crystal */
clk_ext_xtal_mux.parent = xtal_clk;
epll = s3c6400_get_epll(xtal);
mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));
fclk = mpll;
printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
apll, mpll, epll);
hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);
printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
hclk2, hclk, pclk);
clk_fout_mpll.rate = mpll;
clk_fout_epll.rate = epll;
clk_fout_apll.rate = apll;
clk_h2.rate = hclk2;
clk_h.rate = hclk;
clk_p.rate = pclk;
clk_f.rate = fclk;
for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
s3c_set_clksrc(init_parents[ptr], true);
for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
s3c_set_clksrc(&clksrcs[ptr], true);
}
static struct clk *clks[] __initdata = {
&clk_ext_xtal_mux,
&clk_iis_cd0,
&clk_iis_cd1,
&clk_pcm_cd,
&clk_mout_epll.clk,
&clk_mout_mpll.clk,
&clk_dout_mpll,
&clk_arm,
};
/**
* s3c6400_register_clocks - register clocks for s3c6400 and above
* @armclk_divlimit: Divisor mask for ARMCLK
*
* Register the clocks for the S3C6400 and above SoC range, such
* as ARMCLK and the clocks which have divider chains attached.
*
* This call does not setup the clocks, which is left to the
* s3c6400_setup_clocks() call which may be needed by the cpufreq
* or resume code to re-set the clocks if the bootloader has changed
* them.
*/
void __init s3c6400_register_clocks(unsigned armclk_divlimit)
{
struct clk *clkp;
int ret;
int ptr;
armclk_mask = armclk_divlimit;
for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
clkp = clks[ptr];
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
}
s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
}
