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alistair23-linux/arch/arm/mach-s3c24xx/common-s3c2443.c
Heiko Stuebner 0fa93b914d ARM: S3C24XX: number the dma clocks 
Each dma channel has its own clock. The upcoming dma driver wants to
handle these itself and therefore needs to be able to get the correct
clock for a channel.

Therefore rename the dma clocks to "dma.X" for s3c2412, s3c2416 and
s3c2443. This does not change the behaviour for the old dma driver at
all, as all dma clocks are still always on and not handled by the old
dma driver at all.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2013-10-08 06:42:10 +09:00

676 lines
16 KiB
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/*
* Common code for SoCs starting with the S3C2443
*
* Copyright (c) 2007, 2010 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* 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 <linux/init.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/regs-s3c2443-clock.h>
#include <plat/clock.h>
#include <plat/clock-clksrc.h>
#include <plat/cpu.h>
#include <plat/cpu-freq.h>
static int s3c2443_gate(void __iomem *reg, struct clk *clk, int enable)
{
u32 ctrlbit = clk->ctrlbit;
u32 con = __raw_readl(reg);
if (enable)
con |= ctrlbit;
else
con &= ~ctrlbit;
__raw_writel(con, reg);
return 0;
}
int s3c2443_clkcon_enable_h(struct clk *clk, int enable)
{
return s3c2443_gate(S3C2443_HCLKCON, clk, enable);
}
int s3c2443_clkcon_enable_p(struct clk *clk, int enable)
{
return s3c2443_gate(S3C2443_PCLKCON, clk, enable);
}
int s3c2443_clkcon_enable_s(struct clk *clk, int enable)
{
return s3c2443_gate(S3C2443_SCLKCON, clk, enable);
}
/* mpllref is a direct descendant of clk_xtal by default, but it is not
* elided as the EPLL can be either sourced by the XTAL or EXTCLK and as
* such directly equating the two source clocks is impossible.
*/
static struct clk clk_mpllref = {
.name = "mpllref",
.parent = &clk_xtal,
};
static struct clk *clk_epllref_sources[] = {
[0] = &clk_mpllref,
[1] = &clk_mpllref,
[2] = &clk_xtal,
[3] = &clk_ext,
};
struct clksrc_clk clk_epllref = {
.clk = {
.name = "epllref",
},
.sources = &(struct clksrc_sources) {
.sources = clk_epllref_sources,
.nr_sources = ARRAY_SIZE(clk_epllref_sources),
},
.reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 7 },
};
/* esysclk
*
* this is sourced from either the EPLL or the EPLLref clock
*/
static struct clk *clk_sysclk_sources[] = {
[0] = &clk_epllref.clk,
[1] = &clk_epll,
};
struct clksrc_clk clk_esysclk = {
.clk = {
.name = "esysclk",
.parent = &clk_epll,
},
.sources = &(struct clksrc_sources) {
.sources = clk_sysclk_sources,
.nr_sources = ARRAY_SIZE(clk_sysclk_sources),
},
.reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 6 },
};
static unsigned long s3c2443_getrate_mdivclk(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV0);
div &= S3C2443_CLKDIV0_EXTDIV_MASK;
div >>= (S3C2443_CLKDIV0_EXTDIV_SHIFT-1); /* x2 */
return parent_rate / (div + 1);
}
static struct clk clk_mdivclk = {
.name = "mdivclk",
.parent = &clk_mpllref,
.ops = &(struct clk_ops) {
.get_rate = s3c2443_getrate_mdivclk,
},
};
static struct clk *clk_msysclk_sources[] = {
[0] = &clk_mpllref,
[1] = &clk_mpll,
[2] = &clk_mdivclk,
[3] = &clk_mpllref,
};
static struct clksrc_clk clk_msysclk = {
.clk = {
.name = "msysclk",
.parent = &clk_xtal,
},
.sources = &(struct clksrc_sources) {
.sources = clk_msysclk_sources,
.nr_sources = ARRAY_SIZE(clk_msysclk_sources),
},
.reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 3 },
};
/* prediv
*
* this divides the msysclk down to pass to h/p/etc.
*/
static unsigned long s3c2443_prediv_getrate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
clkdiv0 &= S3C2443_CLKDIV0_PREDIV_MASK;
clkdiv0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT;
return rate / (clkdiv0 + 1);
}
static struct clk clk_prediv = {
.name = "prediv",
.parent = &clk_msysclk.clk,
.ops = &(struct clk_ops) {
.get_rate = s3c2443_prediv_getrate,
},
};
/* hclk divider
*
* divides the prediv and provides the hclk.
*/
static unsigned long s3c2443_hclkdiv_getrate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
clkdiv0 &= S3C2443_CLKDIV0_HCLKDIV_MASK;
return rate / (clkdiv0 + 1);
}
static struct clk_ops clk_h_ops = {
.get_rate = s3c2443_hclkdiv_getrate,
};
/* pclk divider
*
* divides the hclk and provides the pclk.
*/
static unsigned long s3c2443_pclkdiv_getrate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
clkdiv0 = ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 1 : 0);
return rate / (clkdiv0 + 1);
}
static struct clk_ops clk_p_ops = {
.get_rate = s3c2443_pclkdiv_getrate,
};
/* armdiv
*
* this clock is sourced from msysclk and can have a number of
* divider values applied to it to then be fed into armclk.
*/
static unsigned int *armdiv;
static int nr_armdiv;
static int armdivmask;
static unsigned long s3c2443_armclk_roundrate(struct clk *clk,
unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
unsigned long calc;
unsigned best = 256; /* bigger than any value */
unsigned div;
int ptr;
if (!nr_armdiv)
return -EINVAL;
for (ptr = 0; ptr < nr_armdiv; ptr++) {
div = armdiv[ptr];
if (div) {
/* cpufreq provides 266mhz as 266666000 not 266666666 */
calc = (parent / div / 1000) * 1000;
if (calc <= rate && div < best)
best = div;
}
}
return parent / best;
}
static unsigned long s3c2443_armclk_getrate(struct clk *clk)
{
unsigned long rate = clk_get_rate(clk->parent);
unsigned long clkcon0;
int val;
if (!nr_armdiv || !armdivmask)
return -EINVAL;
clkcon0 = __raw_readl(S3C2443_CLKDIV0);
clkcon0 &= armdivmask;
val = clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT;
return rate / armdiv[val];
}
static int s3c2443_armclk_setrate(struct clk *clk, unsigned long rate)
{
unsigned long parent = clk_get_rate(clk->parent);
unsigned long calc;
unsigned div;
unsigned best = 256; /* bigger than any value */
int ptr;
int val = -1;
if (!nr_armdiv || !armdivmask)
return -EINVAL;
for (ptr = 0; ptr < nr_armdiv; ptr++) {
div = armdiv[ptr];
if (div) {
/* cpufreq provides 266mhz as 266666000 not 266666666 */
calc = (parent / div / 1000) * 1000;
if (calc <= rate && div < best) {
best = div;
val = ptr;
}
}
}
if (val >= 0) {
unsigned long clkcon0;
clkcon0 = __raw_readl(S3C2443_CLKDIV0);
clkcon0 &= ~armdivmask;
clkcon0 |= val << S3C2443_CLKDIV0_ARMDIV_SHIFT;
__raw_writel(clkcon0, S3C2443_CLKDIV0);
}
return (val == -1) ? -EINVAL : 0;
}
static struct clk clk_armdiv = {
.name = "armdiv",
.parent = &clk_msysclk.clk,
.ops = &(struct clk_ops) {
.round_rate = s3c2443_armclk_roundrate,
.get_rate = s3c2443_armclk_getrate,
.set_rate = s3c2443_armclk_setrate,
},
};
/* armclk
*
* this is the clock fed into the ARM core itself, from armdiv or from hclk.
*/
static struct clk *clk_arm_sources[] = {
[0] = &clk_armdiv,
[1] = &clk_h,
};
static struct clksrc_clk clk_arm = {
.clk = {
.name = "armclk",
},
.sources = &(struct clksrc_sources) {
.sources = clk_arm_sources,
.nr_sources = ARRAY_SIZE(clk_arm_sources),
},
.reg_src = { .reg = S3C2443_CLKDIV0, .size = 1, .shift = 13 },
};
/* usbhost
*
* usb host bus-clock, usually 48MHz to provide USB bus clock timing
*/
static struct clksrc_clk clk_usb_bus_host = {
.clk = {
.name = "usb-bus-host-parent",
.parent = &clk_esysclk.clk,
.ctrlbit = S3C2443_SCLKCON_USBHOST,
.enable = s3c2443_clkcon_enable_s,
},
.reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 },
};
/* common clksrc clocks */
static struct clksrc_clk clksrc_clks[] = {
{
/* camera interface bus-clock, divided down from esysclk */
.clk = {
.name = "camif-upll", /* same as 2440 name */
.parent = &clk_esysclk.clk,
.ctrlbit = S3C2443_SCLKCON_CAMCLK,
.enable = s3c2443_clkcon_enable_s,
},
.reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 26 },
}, {
.clk = {
.name = "display-if",
.parent = &clk_esysclk.clk,
.ctrlbit = S3C2443_SCLKCON_DISPCLK,
.enable = s3c2443_clkcon_enable_s,
},
.reg_div = { .reg = S3C2443_CLKDIV1, .size = 8, .shift = 16 },
},
};
static struct clksrc_clk clk_esys_uart = {
/* ART baud-rate clock sourced from esysclk via a divisor */
.clk = {
.name = "uartclk",
.parent = &clk_esysclk.clk,
},
.reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 8 },
};
static struct clk clk_i2s_ext = {
.name = "i2s-ext",
};
/* i2s_eplldiv
*
* This clock is the output from the I2S divisor of ESYSCLK, and is separate
* from the mux that comes after it (cannot merge into one single clock)
*/
static struct clksrc_clk clk_i2s_eplldiv = {
.clk = {
.name = "i2s-eplldiv",
.parent = &clk_esysclk.clk,
},
.reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, },
};
/* i2s-ref
*
* i2s bus reference clock, selectable from external, esysclk or epllref
*
* Note, this used to be two clocks, but was compressed into one.
*/
static struct clk *clk_i2s_srclist[] = {
[0] = &clk_i2s_eplldiv.clk,
[1] = &clk_i2s_ext,
[2] = &clk_epllref.clk,
[3] = &clk_epllref.clk,
};
static struct clksrc_clk clk_i2s = {
.clk = {
.name = "i2s-if",
.ctrlbit = S3C2443_SCLKCON_I2SCLK,
.enable = s3c2443_clkcon_enable_s,
},
.sources = &(struct clksrc_sources) {
.sources = clk_i2s_srclist,
.nr_sources = ARRAY_SIZE(clk_i2s_srclist),
},
.reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 },
};
static struct clk init_clocks_off[] = {
{
.name = "iis",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_IIS,
}, {
.name = "adc",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_ADC,
}, {
.name = "i2c",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_IIC,
}
};
static struct clk init_clocks[] = {
{
.name = "dma.0",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA0,
}, {
.name = "dma.1",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA1,
}, {
.name = "dma.2",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA2,
}, {
.name = "dma.3",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA3,
}, {
.name = "dma.4",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA4,
}, {
.name = "dma.5",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA5,
}, {
.name = "gpio",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_GPIO,
}, {
.name = "usb-host",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_USBH,
}, {
.name = "usb-device",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_USBD,
}, {
.name = "lcd",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_LCDC,
}, {
.name = "timers",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_PWMT,
}, {
.name = "cfc",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_CFC,
}, {
.name = "ssmc",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_SSMC,
}, {
.name = "uart",
.devname = "s3c2440-uart.0",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART0,
}, {
.name = "uart",
.devname = "s3c2440-uart.1",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART1,
}, {
.name = "uart",
.devname = "s3c2440-uart.2",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART2,
}, {
.name = "uart",
.devname = "s3c2440-uart.3",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART3,
}, {
.name = "rtc",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_RTC,
}, {
.name = "watchdog",
.parent = &clk_p,
.ctrlbit = S3C2443_PCLKCON_WDT,
}, {
.name = "ac97",
.parent = &clk_p,
.ctrlbit = S3C2443_PCLKCON_AC97,
}, {
.name = "nand",
.parent = &clk_h,
}, {
.name = "usb-bus-host",
.parent = &clk_usb_bus_host.clk,
}
};
static struct clk hsmmc1_clk = {
.name = "hsmmc",
.devname = "s3c-sdhci.1",
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_HSMMC,
};
static struct clk hsspi_clk = {
.name = "spi",
.devname = "s3c2443-spi.0",
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_HSSPI,
};
/* EPLLCON compatible enough to get on/off information */
void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll)
{
unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
struct clk *xtal_clk;
unsigned long xtal;
unsigned long pll;
int ptr;
xtal_clk = clk_get(NULL, "xtal");
xtal = clk_get_rate(xtal_clk);
clk_put(xtal_clk);
pll = get_mpll(mpllcon, xtal);
clk_msysclk.clk.rate = pll;
clk_mpll.rate = pll;
printk("CPU: MPLL %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n",
(mpllcon & S3C2443_PLLCON_OFF) ? "off" : "on",
print_mhz(pll), print_mhz(clk_get_rate(&clk_armdiv)),
print_mhz(clk_get_rate(&clk_h)),
print_mhz(clk_get_rate(&clk_p)));
for (ptr = 0; ptr < ARRAY_SIZE(clksrc_clks); ptr++)
s3c_set_clksrc(&clksrc_clks[ptr], true);
/* ensure usb bus clock is within correct rate of 48MHz */
if (clk_get_rate(&clk_usb_bus_host.clk) != (48 * 1000 * 1000)) {
printk(KERN_INFO "Warning: USB host bus not at 48MHz\n");
clk_set_rate(&clk_usb_bus_host.clk, 48*1000*1000);
}
printk("CPU: EPLL %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
(epllcon & S3C2443_PLLCON_OFF) ? "off" : "on",
print_mhz(clk_get_rate(&clk_epll)),
print_mhz(clk_get_rate(&clk_usb_bus)));
}
static struct clk *clks[] __initdata = {
&clk_prediv,
&clk_mpllref,
&clk_mdivclk,
&clk_ext,
&clk_epll,
&clk_usb_bus,
&clk_armdiv,
&hsmmc1_clk,
&hsspi_clk,
};
static struct clksrc_clk *clksrcs[] __initdata = {
&clk_i2s_eplldiv,
&clk_i2s,
&clk_usb_bus_host,
&clk_epllref,
&clk_esysclk,
&clk_msysclk,
&clk_arm,
};
static struct clk_lookup s3c2443_clk_lookup[] = {
CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
CLKDEV_INIT(NULL, "clk_uart_baud2", &clk_p),
CLKDEV_INIT(NULL, "clk_uart_baud3", &clk_esys_uart.clk),
CLKDEV_INIT("s3c-sdhci.1", "mmc_busclk.0", &hsmmc1_clk),
CLKDEV_INIT("s3c2443-spi.0", "spi_busclk0", &hsspi_clk),
};
void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll,
unsigned int *divs, int nr_divs,
int divmask)
{
int ptr;
armdiv = divs;
nr_armdiv = nr_divs;
armdivmask = divmask;
/* s3c2443 parents h clock from prediv */
clk_h.parent = &clk_prediv;
clk_h.ops = &clk_h_ops;
/* and p clock from h clock */
clk_p.parent = &clk_h;
clk_p.ops = &clk_p_ops;
clk_usb_bus.parent = &clk_usb_bus_host.clk;
clk_epll.parent = &clk_epllref.clk;
s3c24xx_register_baseclocks(xtal);
s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
s3c_register_clksrc(clksrcs[ptr], 1);
s3c_register_clksrc(clksrc_clks, ARRAY_SIZE(clksrc_clks));
s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
/* See s3c2443/etc notes on disabling clocks at init time */
s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
clkdev_add_table(s3c2443_clk_lookup, ARRAY_SIZE(s3c2443_clk_lookup));
s3c2443_common_setup_clocks(get_mpll);
}
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