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linux/arch/arm/mach-s5p6440/clock.c
Thomas Abraham 9c72d016e2 ARM: S5P6440: Remove usage of clk_arm and add clk_armclk clock 
The clk_arm clock is of type 'struct clk' whereas on S5P6440,
the arm clock is more suitable to be of type 'struct clksrc_clk'
(since arm clock is divided version of apll clock).

This patch modifies the following.

1. Removes the usage of clk_arm clock (defined in plat-s5p) and
   defines the new clock 'clk_armclk' of type 'struct clksrc_clk'.

2. Rearranges the assignment of clock rate for the fout_a/m/epll
   clocks. This will help in calculating the clock rate of fclk
   from clk_armclk clock and setup the clock rate for fout_m/epll
   for subsequent patches which depend on it.

3. Modifies the clock rate calculation of fclk to be based on
   the newly added clk_armclk clock.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2010-05-13 10:14:48 +09:00

696 lines
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Raw Blame History

/* linux/arch/arm/mach-s5p6440/clock.c
*
* Copyright (c) 2009 Samsung Electronics Co., Ltd.
* http://www.samsung.com/
*
* S5P6440 - 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 <mach/regs-clock.h>
#include <plat/clock.h>
#include <plat/cpu.h>
#include <plat/clock-clksrc.h>
#include <plat/s5p-clock.h>
#include <plat/pll.h>
#include <plat/s5p6440.h>
/* APLL Mux output clock */
static struct clksrc_clk clk_mout_apll = {
.clk = {
.name = "mout_apll",
.id = -1,
},
.sources = &clk_src_apll,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 },
};
static int s5p6440_epll_enable(struct clk *clk, int enable)
{
unsigned int ctrlbit = clk->ctrlbit;
unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit;
if (enable)
__raw_writel(epll_con | ctrlbit, S5P_EPLL_CON);
else
__raw_writel(epll_con, S5P_EPLL_CON);
return 0;
}
static unsigned long s5p6440_epll_get_rate(struct clk *clk)
{
return clk->rate;
}
static u32 epll_div[][5] = {
{ 36000000, 0, 48, 1, 4 },
{ 48000000, 0, 32, 1, 3 },
{ 60000000, 0, 40, 1, 3 },
{ 72000000, 0, 48, 1, 3 },
{ 84000000, 0, 28, 1, 2 },
{ 96000000, 0, 32, 1, 2 },
{ 32768000, 45264, 43, 1, 4 },
{ 45158000, 6903, 30, 1, 3 },
{ 49152000, 50332, 32, 1, 3 },
{ 67738000, 10398, 45, 1, 3 },
{ 73728000, 9961, 49, 1, 3 }
};
static int s5p6440_epll_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int epll_con, epll_con_k;
unsigned int i;
if (clk->rate == rate) /* Return if nothing changed */
return 0;
epll_con = __raw_readl(S5P_EPLL_CON);
epll_con_k = __raw_readl(S5P_EPLL_CON_K);
epll_con_k &= ~(PLL90XX_KDIV_MASK);
epll_con &= ~(PLL90XX_MDIV_MASK | PLL90XX_PDIV_MASK | PLL90XX_SDIV_MASK);
for (i = 0; i < ARRAY_SIZE(epll_div); i++) {
if (epll_div[i][0] == rate) {
epll_con_k |= (epll_div[i][1] << PLL90XX_KDIV_SHIFT);
epll_con |= (epll_div[i][2] << PLL90XX_MDIV_SHIFT) |
(epll_div[i][3] << PLL90XX_PDIV_SHIFT) |
(epll_div[i][4] << PLL90XX_SDIV_SHIFT);
break;
}
}
if (i == ARRAY_SIZE(epll_div)) {
printk(KERN_ERR "%s: Invalid Clock EPLL Frequency\n", __func__);
return -EINVAL;
}
__raw_writel(epll_con, S5P_EPLL_CON);
__raw_writel(epll_con_k, S5P_EPLL_CON_K);
clk->rate = rate;
return 0;
}
static struct clk_ops s5p6440_epll_ops = {
.get_rate = s5p6440_epll_get_rate,
.set_rate = s5p6440_epll_set_rate,
};
static struct clksrc_clk clk_mout_epll = {
.clk = {
.name = "mout_epll",
.id = -1,
},
.sources = &clk_src_epll,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 2, .size = 1 },
};
static struct clksrc_clk clk_mout_mpll = {
.clk = {
.name = "mout_mpll",
.id = -1,
},
.sources = &clk_src_mpll,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 1, .size = 1 },
};
static struct clk clk_h_low = {
.name = "hclk_low",
.id = -1,
.rate = 0,
.parent = NULL,
.ctrlbit = 0,
.ops = &clk_ops_def_setrate,
};
static struct clk clk_p_low = {
.name = "pclk_low",
.id = -1,
.rate = 0,
.parent = NULL,
.ctrlbit = 0,
.ops = &clk_ops_def_setrate,
};
enum perf_level {
L0 = 532*1000,
L1 = 266*1000,
L2 = 133*1000,
};
static const u32 clock_table[][3] = {
/*{ARM_CLK, DIVarm, DIVhclk}*/
{L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P_CLKDIV0_HCLK_SHIFT)},
{L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P_CLKDIV0_HCLK_SHIFT)},
{L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P_CLKDIV0_HCLK_SHIFT)},
};
static unsigned long s5p6440_armclk_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(ARM_CLK_DIV) & ARM_DIV_MASK;
return rate / (clkdiv + 1);
}
static unsigned long s5p6440_armclk_round_rate(struct clk *clk,
unsigned long rate)
{
u32 iter;
for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
if (rate > clock_table[iter][0])
return clock_table[iter-1][0];
}
return clock_table[ARRAY_SIZE(clock_table) - 1][0];
}
static int s5p6440_armclk_set_rate(struct clk *clk, unsigned long rate)
{
u32 round_tmp;
u32 iter;
u32 clk_div0_tmp;
u32 cur_rate = clk->ops->get_rate(clk);
unsigned long flags;
round_tmp = clk->ops->round_rate(clk, rate);
if (round_tmp == cur_rate)
return 0;
for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
if (round_tmp == clock_table[iter][0])
break;
}
if (iter >= ARRAY_SIZE(clock_table))
iter = ARRAY_SIZE(clock_table) - 1;
local_irq_save(flags);
if (cur_rate > round_tmp) {
/* Frequency Down */
clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
clk_div0_tmp |= clock_table[iter][1];
__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
~(S5P_CLKDIV0_HCLK_MASK);
clk_div0_tmp |= clock_table[iter][2];
__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
} else {
/* Frequency Up */
clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
~(S5P_CLKDIV0_HCLK_MASK);
clk_div0_tmp |= clock_table[iter][2];
__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
clk_div0_tmp |= clock_table[iter][1];
__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
}
local_irq_restore(flags);
clk->rate = clock_table[iter][0];
return 0;
}
static struct clk_ops s5p6440_clkarm_ops = {
.get_rate = s5p6440_armclk_get_rate,
.set_rate = s5p6440_armclk_set_rate,
.round_rate = s5p6440_armclk_round_rate,
};
static struct clksrc_clk clk_armclk = {
.clk = {
.name = "armclk",
.id = 1,
.parent = &clk_mout_apll.clk,
.ops = &s5p6440_clkarm_ops,
},
.reg_div = { .reg = S5P_CLK_DIV0, .shift = 0, .size = 4 },
};
static struct clksrc_clk clk_dout_mpll = {
.clk = {
.name = "dout_mpll",
.id = -1,
.parent = &clk_mout_mpll.clk,
},
.reg_div = { .reg = S5P_CLK_DIV0, .shift = 4, .size = 1 },
};
int s5p6440_clk48m_ctrl(struct clk *clk, int enable)
{
unsigned long flags;
u32 val;
/* can't rely on clock lock, this register has other usages */
local_irq_save(flags);
val = __raw_readl(S5P_OTHERS);
if (enable)
val |= S5P_OTHERS_USB_SIG_MASK;
else
val &= ~S5P_OTHERS_USB_SIG_MASK;
__raw_writel(val, S5P_OTHERS);
local_irq_restore(flags);
return 0;
}
static int s5p6440_pclk_ctrl(struct clk *clk, int enable)
{
return s5p_gatectrl(S5P_CLK_GATE_PCLK, clk, enable);
}
static int s5p6440_hclk0_ctrl(struct clk *clk, int enable)
{
return s5p_gatectrl(S5P_CLK_GATE_HCLK0, clk, enable);
}
static int s5p6440_hclk1_ctrl(struct clk *clk, int enable)
{
return s5p_gatectrl(S5P_CLK_GATE_HCLK1, clk, enable);
}
static int s5p6440_sclk_ctrl(struct clk *clk, int enable)
{
return s5p_gatectrl(S5P_CLK_GATE_SCLK0, clk, enable);
}
static int s5p6440_mem_ctrl(struct clk *clk, int enable)
{
return s5p_gatectrl(S5P_CLK_GATE_MEM0, clk, enable);
}
/*
* The following clocks will be disabled during clock initialization. It is
* recommended to keep the following clocks disabled until the driver requests
* for enabling the clock.
*/
static struct clk init_clocks_disable[] = {
{
.name = "nand",
.id = -1,
.parent = &clk_h,
.enable = s5p6440_mem_ctrl,
.ctrlbit = S5P_CLKCON_MEM0_HCLK_NFCON,
}, {
.name = "adc",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_TSADC,
}, {
.name = "i2c",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_IIC0,
}, {
.name = "i2s_v40",
.id = 0,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_IIS2,
}, {
.name = "spi",
.id = 0,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_SPI0,
}, {
.name = "spi",
.id = 1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_SPI1,
}, {
.name = "sclk_spi_48",
.id = 0,
.parent = &clk_48m,
.enable = s5p6440_sclk_ctrl,
.ctrlbit = S5P_CLKCON_SCLK0_SPI0_48,
}, {
.name = "sclk_spi_48",
.id = 1,
.parent = &clk_48m,
.enable = s5p6440_sclk_ctrl,
.ctrlbit = S5P_CLKCON_SCLK0_SPI1_48,
}, {
.name = "mmc_48m",
.id = 0,
.parent = &clk_48m,
.enable = s5p6440_sclk_ctrl,
.ctrlbit = S5P_CLKCON_SCLK0_MMC0_48,
}, {
.name = "mmc_48m",
.id = 1,
.parent = &clk_48m,
.enable = s5p6440_sclk_ctrl,
.ctrlbit = S5P_CLKCON_SCLK0_MMC1_48,
}, {
.name = "mmc_48m",
.id = 2,
.parent = &clk_48m,
.enable = s5p6440_sclk_ctrl,
.ctrlbit = S5P_CLKCON_SCLK0_MMC2_48,
}, {
.name = "otg",
.id = -1,
.parent = &clk_h_low,
.enable = s5p6440_hclk0_ctrl,
.ctrlbit = S5P_CLKCON_HCLK0_USB
}, {
.name = "post",
.id = -1,
.parent = &clk_h_low,
.enable = s5p6440_hclk0_ctrl,
.ctrlbit = S5P_CLKCON_HCLK0_POST0
}, {
.name = "lcd",
.id = -1,
.parent = &clk_h_low,
.enable = s5p6440_hclk1_ctrl,
.ctrlbit = S5P_CLKCON_HCLK1_DISPCON,
}, {
.name = "hsmmc",
.id = 0,
.parent = &clk_h_low,
.enable = s5p6440_hclk0_ctrl,
.ctrlbit = S5P_CLKCON_HCLK0_HSMMC0,
}, {
.name = "hsmmc",
.id = 1,
.parent = &clk_h_low,
.enable = s5p6440_hclk0_ctrl,
.ctrlbit = S5P_CLKCON_HCLK0_HSMMC1,
}, {
.name = "hsmmc",
.id = 2,
.parent = &clk_h_low,
.enable = s5p6440_hclk0_ctrl,
.ctrlbit = S5P_CLKCON_HCLK0_HSMMC2,
}, {
.name = "rtc",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_RTC,
}, {
.name = "watchdog",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_WDT,
}, {
.name = "timers",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_PWM,
}
};
/*
* The following clocks will be enabled during clock initialization.
*/
static struct clk init_clocks[] = {
{
.name = "gpio",
.id = -1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_GPIO,
}, {
.name = "uart",
.id = 0,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_UART0,
}, {
.name = "uart",
.id = 1,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_UART1,
}, {
.name = "uart",
.id = 2,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_UART2,
}, {
.name = "uart",
.id = 3,
.parent = &clk_p_low,
.enable = s5p6440_pclk_ctrl,
.ctrlbit = S5P_CLKCON_PCLK_UART3,
}
};
static struct clk clk_iis_cd_v40 = {
.name = "iis_cdclk_v40",
.id = -1,
};
static struct clk clk_pcm_cd = {
.name = "pcm_cdclk",
.id = -1,
};
static struct clk *clkset_spi_mmc_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll.clk,
&clk_fin_epll,
};
static struct clksrc_sources clkset_spi_mmc = {
.sources = clkset_spi_mmc_list,
.nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
};
static struct clk *clkset_uart_list[] = {
&clk_mout_epll.clk,
&clk_dout_mpll.clk,
};
static struct clksrc_sources clkset_uart = {
.sources = clkset_uart_list,
.nr_sources = ARRAY_SIZE(clkset_uart_list),
};
static struct clksrc_clk clksrcs[] = {
{
.clk = {
.name = "mmc_bus",
.id = 0,
.ctrlbit = S5P_CLKCON_SCLK0_MMC0,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_spi_mmc,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 18, .size = 2 },
.reg_div = { .reg = S5P_CLK_DIV1, .shift = 0, .size = 4 },
}, {
.clk = {
.name = "mmc_bus",
.id = 1,
.ctrlbit = S5P_CLKCON_SCLK0_MMC1,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_spi_mmc,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 20, .size = 2 },
.reg_div = { .reg = S5P_CLK_DIV1, .shift = 4, .size = 4 },
}, {
.clk = {
.name = "mmc_bus",
.id = 2,
.ctrlbit = S5P_CLKCON_SCLK0_MMC2,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_spi_mmc,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 22, .size = 2 },
.reg_div = { .reg = S5P_CLK_DIV1, .shift = 8, .size = 4 },
}, {
.clk = {
.name = "uclk1",
.id = -1,
.ctrlbit = S5P_CLKCON_SCLK0_UART,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_uart,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 13, .size = 1 },
.reg_div = { .reg = S5P_CLK_DIV2, .shift = 16, .size = 4 },
}, {
.clk = {
.name = "spi_epll",
.id = 0,
.ctrlbit = S5P_CLKCON_SCLK0_SPI0,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_spi_mmc,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 14, .size = 2 },
.reg_div = { .reg = S5P_CLK_DIV2, .shift = 0, .size = 4 },
}, {
.clk = {
.name = "spi_epll",
.id = 1,
.ctrlbit = S5P_CLKCON_SCLK0_SPI1,
.enable = s5p6440_sclk_ctrl,
},
.sources = &clkset_spi_mmc,
.reg_src = { .reg = S5P_CLK_SRC0, .shift = 16, .size = 2 },
.reg_div = { .reg = S5P_CLK_DIV2, .shift = 4, .size = 4 },
}
};
/* Clock initialisation code */
static struct clksrc_clk *sysclks[] = {
&clk_mout_apll,
&clk_mout_epll,
&clk_mout_mpll,
&clk_dout_mpll,
&clk_armclk,
};
void __init_or_cpufreq s5p6440_setup_clocks(void)
{
struct clk *xtal_clk;
unsigned long xtal;
unsigned long fclk;
unsigned long hclk;
unsigned long hclk_low;
unsigned long pclk;
unsigned long pclk_low;
unsigned long epll;
unsigned long apll;
unsigned long mpll;
unsigned int ptr;
u32 clkdiv0;
u32 clkdiv3;
/* Set S5P6440 functions for clk_fout_epll */
clk_fout_epll.enable = s5p6440_epll_enable;
clk_fout_epll.ops = &s5p6440_epll_ops;
/* Set S5P6440 functions for arm clock */
clk_48m.enable = s5p6440_clk48m_ctrl;
clkdiv0 = __raw_readl(S5P_CLK_DIV0);
clkdiv3 = __raw_readl(S5P_CLK_DIV3);
xtal_clk = clk_get(NULL, "ext_xtal");
BUG_ON(IS_ERR(xtal_clk));
xtal = clk_get_rate(xtal_clk);
clk_put(xtal_clk);
epll = s5p_get_pll90xx(xtal, __raw_readl(S5P_EPLL_CON),
__raw_readl(S5P_EPLL_CON_K));
mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502);
apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4502);
clk_fout_mpll.rate = mpll;
clk_fout_epll.rate = epll;
clk_fout_apll.rate = apll;
printk(KERN_INFO "S5P6440: PLL settings, A=%ld.%ldMHz, M=%ld.%ldMHz," \
" E=%ld.%ldMHz\n",
print_mhz(apll), print_mhz(mpll), print_mhz(epll));
fclk = clk_get_rate(&clk_armclk.clk);
hclk = fclk / GET_DIV(clkdiv0, S5P_CLKDIV0_HCLK);
pclk = hclk / GET_DIV(clkdiv0, S5P_CLKDIV0_PCLK);
if (__raw_readl(S5P_OTHERS) & S5P_OTHERS_HCLK_LOW_SEL_MPLL) {
/* Asynchronous mode */
hclk_low = mpll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
} else {
/* Synchronous mode */
hclk_low = apll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
}
pclk_low = hclk_low / GET_DIV(clkdiv3, S5P_CLKDIV3_PCLK_LOW);
printk(KERN_INFO "S5P6440: HCLK=%ld.%ldMHz, HCLK_LOW=%ld.%ldMHz," \
" PCLK=%ld.%ldMHz, PCLK_LOW=%ld.%ldMHz\n",
print_mhz(hclk), print_mhz(hclk_low),
print_mhz(pclk), print_mhz(pclk_low));
clk_f.rate = fclk;
clk_h.rate = hclk;
clk_p.rate = pclk;
clk_h_low.rate = hclk_low;
clk_p_low.rate = pclk_low;
for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
s3c_set_clksrc(&clksrcs[ptr], true);
}
static struct clk *clks[] __initdata = {
&clk_ext,
&clk_iis_cd_v40,
&clk_pcm_cd,
&clk_p_low,
&clk_h_low,
};
void __init s5p6440_register_clocks(void)
{
struct clk *clkp;
int ret;
int ptr;
ret = s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
if (ret > 0)
printk(KERN_ERR "Failed to register %u clocks\n", ret);
for (ptr = 0; ptr < ARRAY_SIZE(sysclks); ptr++)
s3c_register_clksrc(sysclks[ptr], 1);
s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
clkp = init_clocks_disable;
for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
(clkp->enable)(clkp, 0);
}
s3c_pwmclk_init();
}
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