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WSL2-Linux-Kernel/arch/arm/mach-s3c2443/clock.c

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24 KiB
C
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/* linux/arch/arm/mach-s3c2443/clock.c
*
* Copyright (c) 2007 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* S3C2443 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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/sysdev.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/serial_core.h>
#include <asm/mach/map.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/arch/regs-s3c2443-clock.h>
#include <asm/plat-s3c24xx/s3c2443.h>
#include <asm/plat-s3c24xx/clock.h>
#include <asm/plat-s3c24xx/cpu.h>
/* We currently have to assume that the system is running
* from the XTPll input, and that all ***REFCLKs are being
* fed from it, as we cannot read the state of OM[4] from
* software.
*
* It would be possible for each board initialisation to
* set the correct muxing at initialisation
*/
static int s3c2443_clkcon_enable_h(struct clk *clk, int enable)
{
unsigned int clocks = clk->ctrlbit;
unsigned long clkcon;
clkcon = __raw_readl(S3C2443_HCLKCON);
if (enable)
clkcon |= clocks;
else
clkcon &= ~clocks;
__raw_writel(clkcon, S3C2443_HCLKCON);
return 0;
}
static int s3c2443_clkcon_enable_p(struct clk *clk, int enable)
{
unsigned int clocks = clk->ctrlbit;
unsigned long clkcon;
clkcon = __raw_readl(S3C2443_PCLKCON);
if (enable)
clkcon |= clocks;
else
clkcon &= ~clocks;
__raw_writel(clkcon, S3C2443_HCLKCON);
return 0;
}
static int s3c2443_clkcon_enable_s(struct clk *clk, int enable)
{
unsigned int clocks = clk->ctrlbit;
unsigned long clkcon;
clkcon = __raw_readl(S3C2443_SCLKCON);
if (enable)
clkcon |= clocks;
else
clkcon &= ~clocks;
__raw_writel(clkcon, S3C2443_SCLKCON);
return 0;
}
static unsigned long s3c2443_roundrate_clksrc(struct clk *clk,
unsigned long rate,
unsigned int max)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
int div;
if (rate > parent_rate)
return parent_rate;
/* note, we remove the +/- 1 calculations as they cancel out */
div = (rate / parent_rate);
if (div < 1)
div = 1;
else if (div > max)
div = max;
return parent_rate / div;
}
static unsigned long s3c2443_roundrate_clksrc4(struct clk *clk,
unsigned long rate)
{
return s3c2443_roundrate_clksrc(clk, rate, 4);
}
static unsigned long s3c2443_roundrate_clksrc16(struct clk *clk,
unsigned long rate)
{
return s3c2443_roundrate_clksrc(clk, rate, 16);
}
static unsigned long s3c2443_roundrate_clksrc256(struct clk *clk,
unsigned long rate)
{
return s3c2443_roundrate_clksrc(clk, rate, 256);
}
/* clock selections */
/* CPU EXTCLK input */
static struct clk clk_ext = {
.name = "ext",
.id = -1,
};
static struct clk clk_mpllref = {
.name = "mpllref",
.parent = &clk_xtal,
.id = -1,
};
#if 0
static struct clk clk_mpll = {
.name = "mpll",
.parent = &clk_mpllref,
.id = -1,
};
#endif
static struct clk clk_epllref;
static struct clk clk_epll = {
.name = "epll",
.parent = &clk_epllref,
.id = -1,
};
static struct clk clk_i2s_ext = {
.name = "i2s-ext",
.id = -1,
};
static int s3c2443_setparent_epllref(struct clk *clk, struct clk *parent)
{
unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
clksrc &= ~S3C2443_CLKSRC_EPLLREF_MASK;
if (parent == &clk_xtal)
clksrc |= S3C2443_CLKSRC_EPLLREF_XTAL;
else if (parent == &clk_ext)
clksrc |= S3C2443_CLKSRC_EPLLREF_EXTCLK;
else if (parent != &clk_mpllref)
return -EINVAL;
__raw_writel(clksrc, S3C2443_CLKSRC);
clk->parent = parent;
return 0;
}
static struct clk clk_epllref = {
.name = "epllref",
.id = -1,
.set_parent = s3c2443_setparent_epllref,
};
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,
.id = -1,
.get_rate = s3c2443_getrate_mdivclk,
};
static int s3c2443_setparent_msysclk(struct clk *clk, struct clk *parent)
{
unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
clksrc &= ~(S3C2443_CLKSRC_MSYSCLK_MPLL |
S3C2443_CLKSRC_EXTCLK_DIV);
if (parent == &clk_mpll)
clksrc |= S3C2443_CLKSRC_MSYSCLK_MPLL;
else if (parent == &clk_mdivclk)
clksrc |= S3C2443_CLKSRC_EXTCLK_DIV;
else if (parent != &clk_mpllref)
return -EINVAL;
__raw_writel(clksrc, S3C2443_CLKSRC);
clk->parent = parent;
return 0;
}
static struct clk clk_msysclk = {
.name = "msysclk",
.parent = &clk_xtal,
.id = -1,
.set_parent = s3c2443_setparent_msysclk,
};
/* esysclk
*
* this is sourced from either the EPLL or the EPLLref clock
*/
static int s3c2443_setparent_esysclk(struct clk *clk, struct clk *parent)
{
unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
if (parent == &clk_epll)
clksrc |= S3C2443_CLKSRC_ESYSCLK_EPLL;
else if (parent == &clk_epllref)
clksrc &= ~S3C2443_CLKSRC_ESYSCLK_EPLL;
else
return -EINVAL;
__raw_writel(clksrc, S3C2443_CLKSRC);
clk->parent = parent;
return 0;
}
static struct clk clk_esysclk = {
.name = "esysclk",
.parent = &clk_epll,
.id = -1,
.set_parent = s3c2443_setparent_esysclk,
};
/* uartclk
*
* UART baud-rate clock sourced from esysclk via a divisor
*/
static unsigned long s3c2443_getrate_uart(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_UARTDIV_MASK;
div >>= S3C2443_CLKDIV1_UARTDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_uart(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc16(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_uart = {
.name = "uartclk",
.id = -1,
.parent = &clk_esysclk,
.get_rate = s3c2443_getrate_uart,
.set_rate = s3c2443_setrate_uart,
.round_rate = s3c2443_roundrate_clksrc16,
};
/* hsspi
*
* high-speed spi clock, sourced from esysclk
*/
static unsigned long s3c2443_getrate_hsspi(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_HSSPIDIV_MASK;
div >>= S3C2443_CLKDIV1_HSSPIDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_hsspi(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc4(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_HSSPIDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSSPIDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_hsspi = {
.name = "hsspi",
.id = -1,
.parent = &clk_esysclk,
.ctrlbit = S3C2443_SCLKCON_HSSPICLK,
.enable = s3c2443_clkcon_enable_s,
.get_rate = s3c2443_getrate_hsspi,
.set_rate = s3c2443_setrate_hsspi,
.round_rate = s3c2443_roundrate_clksrc4,
};
/* usbhost
*
* usb host bus-clock, usually 48MHz to provide USB bus clock timing
*/
static unsigned long s3c2443_getrate_usbhost(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_USBHOSTDIV_MASK;
div >>= S3C2443_CLKDIV1_USBHOSTDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_usbhost(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc4(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_USBHOSTDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_USBHOSTDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_usb_bus_host = {
.name = "usb-bus-host-parent",
.id = -1,
.parent = &clk_esysclk,
.ctrlbit = S3C2443_SCLKCON_USBHOST,
.enable = s3c2443_clkcon_enable_s,
.get_rate = s3c2443_getrate_usbhost,
.set_rate = s3c2443_setrate_usbhost,
.round_rate = s3c2443_roundrate_clksrc4,
};
/* clk_hsmcc_div
*
* this clock is sourced from epll, and is fed through a divider,
* to a mux controlled by sclkcon where either it or a extclk can
* be fed to the hsmmc block
*/
static unsigned long s3c2443_getrate_hsmmc_div(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_HSMMCDIV_MASK;
div >>= S3C2443_CLKDIV1_HSMMCDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_hsmmc_div(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc4(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_HSMMCDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_HSMMCDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_hsmmc_div = {
.name = "hsmmc-div",
.id = -1,
.parent = &clk_esysclk,
.get_rate = s3c2443_getrate_hsmmc_div,
.set_rate = s3c2443_setrate_hsmmc_div,
.round_rate = s3c2443_roundrate_clksrc4,
};
static int s3c2443_setparent_hsmmc(struct clk *clk, struct clk *parent)
{
unsigned long clksrc = __raw_readl(S3C2443_SCLKCON);
clksrc &= ~(S3C2443_SCLKCON_HSMMCCLK_EXT |
S3C2443_SCLKCON_HSMMCCLK_EPLL);
if (parent == &clk_epll)
clksrc |= S3C2443_SCLKCON_HSMMCCLK_EPLL;
else if (parent == &clk_ext)
clksrc |= S3C2443_SCLKCON_HSMMCCLK_EXT;
else
return -EINVAL;
if (clk->usage > 0) {
__raw_writel(clksrc, S3C2443_SCLKCON);
}
clk->parent = parent;
return 0;
}
static int s3c2443_enable_hsmmc(struct clk *clk, int enable)
{
return s3c2443_setparent_hsmmc(clk, clk->parent);
}
static struct clk clk_hsmmc = {
.name = "hsmmc-if",
.id = -1,
.parent = &clk_hsmmc_div,
.enable = s3c2443_enable_hsmmc,
.set_parent = s3c2443_setparent_hsmmc,
};
/* i2s_eplldiv
*
* this clock is the output from the i2s divisor of esysclk
*/
static unsigned long s3c2443_getrate_i2s_eplldiv(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_I2SDIV_MASK;
div >>= S3C2443_CLKDIV1_I2SDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_i2s_eplldiv(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc16(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_I2SDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_I2SDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_i2s_eplldiv = {
.name = "i2s-eplldiv",
.id = -1,
.parent = &clk_esysclk,
.get_rate = s3c2443_getrate_i2s_eplldiv,
.set_rate = s3c2443_setrate_i2s_eplldiv,
.round_rate = s3c2443_roundrate_clksrc16,
};
/* i2s-ref
*
* i2s bus reference clock, selectable from external, esysclk or epllref
*/
static int s3c2443_setparent_i2s(struct clk *clk, struct clk *parent)
{
unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
clksrc &= ~S3C2443_CLKSRC_I2S_MASK;
if (parent == &clk_epllref)
clksrc |= S3C2443_CLKSRC_I2S_EPLLREF;
else if (parent == &clk_i2s_ext)
clksrc |= S3C2443_CLKSRC_I2S_EXT;
else if (parent != &clk_i2s_eplldiv)
return -EINVAL;
clk->parent = parent;
__raw_writel(clksrc, S3C2443_CLKSRC);
return 0;
}
static struct clk clk_i2s = {
.name = "i2s-if",
.id = -1,
.parent = &clk_i2s_eplldiv,
.ctrlbit = S3C2443_SCLKCON_I2SCLK,
.enable = s3c2443_clkcon_enable_s,
.set_parent = s3c2443_setparent_i2s,
};
/* cam-if
*
* camera interface bus-clock, divided down from esysclk
*/
static unsigned long s3c2443_getrate_cam(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_CAMDIV_MASK;
div >>= S3C2443_CLKDIV1_CAMDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_cam(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdiv1 = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc16(clk, rate);
rate = parent_rate / rate;
clkdiv1 &= ~S3C2443_CLKDIV1_CAMDIV_MASK;
clkdiv1 |= (rate - 1) << S3C2443_CLKDIV1_CAMDIV_SHIFT;
__raw_writel(clkdiv1, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_cam = {
.name = "camif-upll", /* same as 2440 name */
.id = -1,
.parent = &clk_esysclk,
.ctrlbit = S3C2443_SCLKCON_CAMCLK,
.enable = s3c2443_clkcon_enable_s,
.get_rate = s3c2443_getrate_cam,
.set_rate = s3c2443_setrate_cam,
.round_rate = s3c2443_roundrate_clksrc16,
};
/* display-if
*
* display interface clock, divided from esysclk
*/
static unsigned long s3c2443_getrate_display(struct clk *clk)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long div = __raw_readl(S3C2443_CLKDIV1);
div &= S3C2443_CLKDIV1_DISPDIV_MASK;
div >>= S3C2443_CLKDIV1_DISPDIV_SHIFT;
return parent_rate / (div + 1);
}
static int s3c2443_setrate_display(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long clkdivn = __raw_readl(S3C2443_CLKDIV1);
rate = s3c2443_roundrate_clksrc256(clk, rate);
rate = parent_rate / rate;
clkdivn &= ~S3C2443_CLKDIV1_UARTDIV_MASK;
clkdivn |= (rate - 1) << S3C2443_CLKDIV1_UARTDIV_SHIFT;
__raw_writel(clkdivn, S3C2443_CLKDIV1);
return 0;
}
static struct clk clk_display = {
.name = "display-if",
.id = -1,
.parent = &clk_esysclk,
.ctrlbit = S3C2443_SCLKCON_DISPCLK,
.enable = s3c2443_clkcon_enable_s,
.get_rate = s3c2443_getrate_display,
.set_rate = s3c2443_setrate_display,
.round_rate = s3c2443_roundrate_clksrc256,
};
/* standard clock definitions */
static struct clk init_clocks_disable[] = {
{
.name = "nand",
.id = -1,
.parent = &clk_h,
}, {
.name = "sdi",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_SDI,
}, {
.name = "adc",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_ADC,
}, {
.name = "i2c",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_IIC,
}, {
.name = "iis",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_IIS,
}, {
.name = "spi",
.id = 0,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_SPI0,
}, {
.name = "spi",
.id = 1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_SPI1,
}
};
static struct clk init_clocks[] = {
{
.name = "dma",
.id = 0,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA0,
}, {
.name = "dma",
.id = 1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA1,
}, {
.name = "dma",
.id = 2,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA2,
}, {
.name = "dma",
.id = 3,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA3,
}, {
.name = "dma",
.id = 4,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA4,
}, {
.name = "dma",
.id = 5,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_DMA5,
}, {
.name = "lcd",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_LCDC,
}, {
.name = "gpio",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_GPIO,
}, {
.name = "usb-host",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_USBH,
}, {
.name = "usb-device",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_USBD,
}, {
.name = "hsmmc",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_HSMMC,
}, {
.name = "cfc",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_CFC,
}, {
.name = "ssmc",
.id = -1,
.parent = &clk_h,
.enable = s3c2443_clkcon_enable_h,
.ctrlbit = S3C2443_HCLKCON_SSMC,
}, {
.name = "timers",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_PWMT,
}, {
.name = "uart",
.id = 0,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART0,
}, {
.name = "uart",
.id = 1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART1,
}, {
.name = "uart",
.id = 2,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART2,
}, {
.name = "uart",
.id = 3,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_UART3,
}, {
.name = "rtc",
.id = -1,
.parent = &clk_p,
.enable = s3c2443_clkcon_enable_p,
.ctrlbit = S3C2443_PCLKCON_RTC,
}, {
.name = "watchdog",
.id = -1,
.parent = &clk_p,
.ctrlbit = S3C2443_PCLKCON_WDT,
}, {
.name = "usb-bus-host",
.id = -1,
.parent = &clk_usb_bus_host,
}, {
.name = "ac97",
.id = -1,
.parent = &clk_p,
.ctrlbit = S3C2443_PCLKCON_AC97,
}
};
/* clocks to add where we need to check their parentage */
/* s3c2443_clk_initparents
*
* Initialise the parents for the clocks that we get at start-time
*/
static int __init clk_init_set_parent(struct clk *clk, struct clk *parent)
{
printk(KERN_DEBUG "clock %s: parent %s\n", clk->name, parent->name);
return clk_set_parent(clk, parent);
}
static void __init s3c2443_clk_initparents(void)
{
unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
struct clk *parent;
switch (clksrc & S3C2443_CLKSRC_EPLLREF_MASK) {
case S3C2443_CLKSRC_EPLLREF_EXTCLK:
parent = &clk_ext;
break;
case S3C2443_CLKSRC_EPLLREF_XTAL:
default:
parent = &clk_xtal;
break;
case S3C2443_CLKSRC_EPLLREF_MPLLREF:
case S3C2443_CLKSRC_EPLLREF_MPLLREF2:
parent = &clk_mpllref;
break;
}
clk_init_set_parent(&clk_epllref, parent);
switch (clksrc & S3C2443_CLKSRC_I2S_MASK) {
case S3C2443_CLKSRC_I2S_EXT:
parent = &clk_i2s_ext;
break;
case S3C2443_CLKSRC_I2S_EPLLDIV:
default:
parent = &clk_i2s_eplldiv;
break;
case S3C2443_CLKSRC_I2S_EPLLREF:
case S3C2443_CLKSRC_I2S_EPLLREF3:
parent = &clk_epllref;
}
clk_init_set_parent(&clk_i2s, &clk_epllref);
/* esysclk source */
parent = (clksrc & S3C2443_CLKSRC_ESYSCLK_EPLL) ?
&clk_epll : &clk_epllref;
clk_init_set_parent(&clk_esysclk, parent);
/* msysclk source */
if (clksrc & S3C2443_CLKSRC_MSYSCLK_MPLL) {
parent = &clk_mpll;
} else {
parent = (clksrc & S3C2443_CLKSRC_EXTCLK_DIV) ?
&clk_mdivclk : &clk_mpllref;
}
clk_init_set_parent(&clk_msysclk, parent);
}
/* armdiv divisor table */
static unsigned int armdiv[16] = {
[S3C2443_CLKDIV0_ARMDIV_1 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 1,
[S3C2443_CLKDIV0_ARMDIV_2 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 2,
[S3C2443_CLKDIV0_ARMDIV_3 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 3,
[S3C2443_CLKDIV0_ARMDIV_4 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 4,
[S3C2443_CLKDIV0_ARMDIV_6 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 6,
[S3C2443_CLKDIV0_ARMDIV_8 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 8,
[S3C2443_CLKDIV0_ARMDIV_12 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 12,
[S3C2443_CLKDIV0_ARMDIV_16 >> S3C2443_CLKDIV0_ARMDIV_SHIFT] = 16,
};
static inline unsigned int s3c2443_fclk_div(unsigned long clkcon0)
{
clkcon0 &= S3C2443_CLKDIV0_ARMDIV_MASK;
return armdiv[clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT];
}
static inline unsigned long s3c2443_get_prediv(unsigned long clkcon0)
{
clkcon0 &= S3C2443_CLKDIV0_PREDIV_MASK;
clkcon0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT;
return clkcon0 + 1;
}
/* clocks to add straight away */
static struct clk *clks[] __initdata = {
&clk_ext,
&clk_epll,
&clk_usb_bus_host,
&clk_usb_bus,
&clk_esysclk,
&clk_epllref,
&clk_mpllref,
&clk_msysclk,
&clk_uart,
&clk_display,
&clk_cam,
&clk_i2s_eplldiv,
&clk_i2s,
&clk_hsspi,
&clk_hsmmc_div,
&clk_hsmmc,
};
void __init s3c2443_init_clocks(int xtal)
{
unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
unsigned long pll;
unsigned long fclk;
unsigned long hclk;
unsigned long pclk;
struct clk *clkp;
int ret;
int ptr;
pll = s3c2443_get_mpll(mpllcon, xtal);
fclk = pll / s3c2443_fclk_div(clkdiv0);
hclk = fclk / s3c2443_get_prediv(clkdiv0);
hclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_HCLK) ? 2 : 1);
pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
printk("S3C2443: 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(fclk),
print_mhz(hclk), print_mhz(pclk));
s3c2443_clk_initparents();
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);
}
}
clk_epll.rate = s3c2443_get_epll(epllcon, xtal);
clk_usb_bus.parent = &clk_usb_bus_host;
/* ensure usb bus clock is within correct rate of 48MHz */
if (clk_get_rate(&clk_usb_bus_host) != (48 * 1000 * 1000)) {
printk(KERN_INFO "Warning: USB host bus not at 48MHz\n");
clk_set_rate(&clk_usb_bus_host, 48*1000*1000);
}
printk("S3C2443: 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)));
/* register clocks from clock array */
clkp = init_clocks;
for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
ret = s3c24xx_register_clock(clkp);
if (ret < 0) {
printk(KERN_ERR "Failed to register clock %s (%d)\n",
clkp->name, ret);
}
}
/* We must be careful disabling the clocks we are not intending to
* be using at boot time, as subsystems such as the LCD which do
* their own DMA requests to the bus can cause the system to lockup
* if they where in the middle of requesting bus access.
*
* Disabling the LCD clock if the LCD is active is very dangerous,
* and therefore the bootloader should be careful to not enable
* the LCD clock if it is not needed.
*/
/* install (and disable) the clocks we do not need immediately */
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);
}
}
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