linux/arch/arm/mach-mx1/clock.c

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/*
* Copyright (C) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/math64.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/clock.h>
#include <mach/hardware.h>
#include "crm_regs.h"
static int _clk_enable(struct clk *clk)
{
unsigned int reg;
reg = __raw_readl(clk->enable_reg);
reg |= 1 << clk->enable_shift;
__raw_writel(reg, clk->enable_reg);
return 0;
}
static void _clk_disable(struct clk *clk)
{
unsigned int reg;
reg = __raw_readl(clk->enable_reg);
reg &= ~(1 << clk->enable_shift);
__raw_writel(reg, clk->enable_reg);
}
static int _clk_can_use_parent(const struct clk *clk_arr[], unsigned int size,
struct clk *parent)
{
int i;
for (i = 0; i < size; i++)
if (parent == clk_arr[i])
return i;
return -EINVAL;
}
static unsigned long
_clk_simple_round_rate(struct clk *clk, unsigned long rate, unsigned int limit)
{
int div;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (parent_rate % rate)
div++;
if (div > limit)
div = limit;
return parent_rate / div;
}
static unsigned long _clk_parent_round_rate(struct clk *clk, unsigned long rate)
{
return clk->parent->round_rate(clk->parent, rate);
}
static int _clk_parent_set_rate(struct clk *clk, unsigned long rate)
{
return clk->parent->set_rate(clk->parent, rate);
}
/*
* get the system pll clock in Hz
*
* mfi + mfn / (mfd +1)
* f = 2 * f_ref * --------------------
* pd + 1
*/
static unsigned long mx1_decode_pll(unsigned int pll, u32 f_ref)
{
unsigned long long ll;
unsigned long quot;
u32 mfi = (pll >> 10) & 0xf;
u32 mfn = pll & 0x3ff;
u32 mfd = (pll >> 16) & 0x3ff;
u32 pd = (pll >> 26) & 0xf;
mfi = mfi <= 5 ? 5 : mfi;
ll = 2 * (unsigned long long)f_ref *
((mfi << 16) + (mfn << 16) / (mfd + 1));
quot = (pd + 1) * (1 << 16);
ll += quot / 2;
do_div(ll, quot);
return (unsigned long)ll;
}
static unsigned long clk16m_get_rate(struct clk *clk)
{
return 16000000;
}
static struct clk clk16m = {
.name = "CLK16M",
.get_rate = clk16m_get_rate,
.enable = _clk_enable,
.enable_reg = CCM_CSCR,
.enable_shift = CCM_CSCR_OSC_EN_SHIFT,
.disable = _clk_disable,
};
/* in Hz */
static unsigned long clk32_rate;
static unsigned long clk32_get_rate(struct clk *clk)
{
return clk32_rate;
}
static struct clk clk32 = {
.name = "CLK32",
.get_rate = clk32_get_rate,
};
static unsigned long clk32_premult_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) * 512;
}
static struct clk clk32_premult = {
.name = "CLK32_premultiplier",
.parent = &clk32,
.get_rate = clk32_premult_get_rate,
};
static const struct clk *prem_clk_clocks[] = {
&clk32_premult,
&clk16m,
};
static int prem_clk_set_parent(struct clk *clk, struct clk *parent)
{
int i;
unsigned int reg = __raw_readl(CCM_CSCR);
i = _clk_can_use_parent(prem_clk_clocks, ARRAY_SIZE(prem_clk_clocks),
parent);
switch (i) {
case 0:
reg &= ~CCM_CSCR_SYSTEM_SEL;
break;
case 1:
reg |= CCM_CSCR_SYSTEM_SEL;
break;
default:
return i;
}
__raw_writel(reg, CCM_CSCR);
return 0;
}
static struct clk prem_clk = {
.name = "prem_clk",
.set_parent = prem_clk_set_parent,
};
static unsigned long system_clk_get_rate(struct clk *clk)
{
return mx1_decode_pll(__raw_readl(CCM_SPCTL0),
clk_get_rate(clk->parent));
}
static struct clk system_clk = {
.name = "system_clk",
.parent = &prem_clk,
.get_rate = system_clk_get_rate,
};
static unsigned long mcu_clk_get_rate(struct clk *clk)
{
return mx1_decode_pll(__raw_readl(CCM_MPCTL0),
clk_get_rate(clk->parent));
}
static struct clk mcu_clk = {
.name = "mcu_clk",
.parent = &clk32_premult,
.get_rate = mcu_clk_get_rate,
};
static unsigned long fclk_get_rate(struct clk *clk)
{
unsigned long fclk = clk_get_rate(clk->parent);
if (__raw_readl(CCM_CSCR) & CCM_CSCR_PRESC)
fclk /= 2;
return fclk;
}
static struct clk fclk = {
.name = "fclk",
.parent = &mcu_clk,
.get_rate = fclk_get_rate,
};
/*
* get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA )
*/
static unsigned long hclk_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) / (((__raw_readl(CCM_CSCR) &
CCM_CSCR_BCLK_MASK) >> CCM_CSCR_BCLK_OFFSET) + 1);
}
static unsigned long hclk_round_rate(struct clk *clk, unsigned long rate)
{
return _clk_simple_round_rate(clk, rate, 16);
}
static int hclk_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int div;
unsigned int reg;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (div > 16 || div < 1 || ((parent_rate / div) != rate))
return -EINVAL;
div--;
reg = __raw_readl(CCM_CSCR);
reg &= ~CCM_CSCR_BCLK_MASK;
reg |= div << CCM_CSCR_BCLK_OFFSET;
__raw_writel(reg, CCM_CSCR);
return 0;
}
static struct clk hclk = {
.name = "hclk",
.parent = &system_clk,
.get_rate = hclk_get_rate,
.round_rate = hclk_round_rate,
.set_rate = hclk_set_rate,
};
static unsigned long clk48m_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) / (((__raw_readl(CCM_CSCR) &
CCM_CSCR_USB_MASK) >> CCM_CSCR_USB_OFFSET) + 1);
}
static unsigned long clk48m_round_rate(struct clk *clk, unsigned long rate)
{
return _clk_simple_round_rate(clk, rate, 8);
}
static int clk48m_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int div;
unsigned int reg;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (div > 8 || div < 1 || ((parent_rate / div) != rate))
return -EINVAL;
div--;
reg = __raw_readl(CCM_CSCR);
reg &= ~CCM_CSCR_USB_MASK;
reg |= div << CCM_CSCR_USB_OFFSET;
__raw_writel(reg, CCM_CSCR);
return 0;
}
static struct clk clk48m = {
.name = "CLK48M",
.parent = &system_clk,
.get_rate = clk48m_get_rate,
.round_rate = clk48m_round_rate,
.set_rate = clk48m_set_rate,
};
/*
* get peripheral clock 1 ( UART[12], Timer[12], PWM )
*/
static unsigned long perclk1_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
CCM_PCDR_PCLK1_MASK) >> CCM_PCDR_PCLK1_OFFSET) + 1);
}
static unsigned long perclk1_round_rate(struct clk *clk, unsigned long rate)
{
return _clk_simple_round_rate(clk, rate, 16);
}
static int perclk1_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int div;
unsigned int reg;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (div > 16 || div < 1 || ((parent_rate / div) != rate))
return -EINVAL;
div--;
reg = __raw_readl(CCM_PCDR);
reg &= ~CCM_PCDR_PCLK1_MASK;
reg |= div << CCM_PCDR_PCLK1_OFFSET;
__raw_writel(reg, CCM_PCDR);
return 0;
}
/*
* get peripheral clock 2 ( LCD, SD, SPI[12] )
*/
static unsigned long perclk2_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
CCM_PCDR_PCLK2_MASK) >> CCM_PCDR_PCLK2_OFFSET) + 1);
}
static unsigned long perclk2_round_rate(struct clk *clk, unsigned long rate)
{
return _clk_simple_round_rate(clk, rate, 16);
}
static int perclk2_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int div;
unsigned int reg;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (div > 16 || div < 1 || ((parent_rate / div) != rate))
return -EINVAL;
div--;
reg = __raw_readl(CCM_PCDR);
reg &= ~CCM_PCDR_PCLK2_MASK;
reg |= div << CCM_PCDR_PCLK2_OFFSET;
__raw_writel(reg, CCM_PCDR);
return 0;
}
/*
* get peripheral clock 3 ( SSI )
*/
static unsigned long perclk3_get_rate(struct clk *clk)
{
return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
CCM_PCDR_PCLK3_MASK) >> CCM_PCDR_PCLK3_OFFSET) + 1);
}
static unsigned long perclk3_round_rate(struct clk *clk, unsigned long rate)
{
return _clk_simple_round_rate(clk, rate, 128);
}
static int perclk3_set_rate(struct clk *clk, unsigned long rate)
{
unsigned int div;
unsigned int reg;
unsigned long parent_rate;
parent_rate = clk_get_rate(clk->parent);
div = parent_rate / rate;
if (div > 128 || div < 1 || ((parent_rate / div) != rate))
return -EINVAL;
div--;
reg = __raw_readl(CCM_PCDR);
reg &= ~CCM_PCDR_PCLK3_MASK;
reg |= div << CCM_PCDR_PCLK3_OFFSET;
__raw_writel(reg, CCM_PCDR);
return 0;
}
static struct clk perclk[] = {
{
.name = "perclk",
.id = 0,
.parent = &system_clk,
.get_rate = perclk1_get_rate,
.round_rate = perclk1_round_rate,
.set_rate = perclk1_set_rate,
}, {
.name = "perclk",
.id = 1,
.parent = &system_clk,
.get_rate = perclk2_get_rate,
.round_rate = perclk2_round_rate,
.set_rate = perclk2_set_rate,
}, {
.name = "perclk",
.id = 2,
.parent = &system_clk,
.get_rate = perclk3_get_rate,
.round_rate = perclk3_round_rate,
.set_rate = perclk3_set_rate,
}
};
static const struct clk *clko_clocks[] = {
&perclk[0],
&hclk,
&clk48m,
&clk16m,
&prem_clk,
&fclk,
};
static int clko_set_parent(struct clk *clk, struct clk *parent)
{
int i;
unsigned int reg;
i = _clk_can_use_parent(clko_clocks, ARRAY_SIZE(clko_clocks), parent);
if (i < 0)
return i;
reg = __raw_readl(CCM_CSCR) & ~CCM_CSCR_CLKO_MASK;
reg |= i << CCM_CSCR_CLKO_OFFSET;
__raw_writel(reg, CCM_CSCR);
if (clko_clocks[i]->set_rate && clko_clocks[i]->round_rate) {
clk->set_rate = _clk_parent_set_rate;
clk->round_rate = _clk_parent_round_rate;
} else {
clk->set_rate = NULL;
clk->round_rate = NULL;
}
return 0;
}
static struct clk clko_clk = {
.name = "clko_clk",
.set_parent = clko_set_parent,
};
static struct clk dma_clk = {
.name = "dma_clk",
.parent = &hclk,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
.enable = _clk_enable,
.enable_reg = SCM_GCCR,
.enable_shift = SCM_GCCR_DMA_CLK_EN_OFFSET,
.disable = _clk_disable,
};
static struct clk csi_clk = {
.name = "csi_clk",
.parent = &hclk,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
.enable = _clk_enable,
.enable_reg = SCM_GCCR,
.enable_shift = SCM_GCCR_CSI_CLK_EN_OFFSET,
.disable = _clk_disable,
};
static struct clk mma_clk = {
.name = "mma_clk",
.parent = &hclk,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
.enable = _clk_enable,
.enable_reg = SCM_GCCR,
.enable_shift = SCM_GCCR_MMA_CLK_EN_OFFSET,
.disable = _clk_disable,
};
static struct clk usbd_clk = {
.name = "usbd_clk",
.parent = &clk48m,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
.enable = _clk_enable,
.enable_reg = SCM_GCCR,
.enable_shift = SCM_GCCR_USBD_CLK_EN_OFFSET,
.disable = _clk_disable,
};
static struct clk gpt_clk = {
.name = "gpt_clk",
.parent = &perclk[0],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk uart_clk = {
.name = "uart_clk",
.parent = &perclk[0],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk i2c_clk = {
.name = "i2c_clk",
.parent = &hclk,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk spi_clk = {
.name = "spi_clk",
.parent = &perclk[1],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk sdhc_clk = {
.name = "sdhc_clk",
.parent = &perclk[1],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk lcdc_clk = {
.name = "lcdc_clk",
.parent = &perclk[1],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk mshc_clk = {
.name = "mshc_clk",
.parent = &hclk,
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk ssi_clk = {
.name = "ssi_clk",
.parent = &perclk[2],
.round_rate = _clk_parent_round_rate,
.set_rate = _clk_parent_set_rate,
};
static struct clk rtc_clk = {
.name = "rtc_clk",
.parent = &clk32,
};
static struct clk *mxc_clks[] = {
&clk16m,
&clk32,
&clk32_premult,
&prem_clk,
&system_clk,
&mcu_clk,
&fclk,
&hclk,
&clk48m,
&perclk[0],
&perclk[1],
&perclk[2],
&clko_clk,
&dma_clk,
&csi_clk,
&mma_clk,
&usbd_clk,
&gpt_clk,
&uart_clk,
&i2c_clk,
&spi_clk,
&sdhc_clk,
&lcdc_clk,
&mshc_clk,
&ssi_clk,
&rtc_clk,
};
int __init mxc_clocks_init(unsigned long fref)
{
struct clk **clkp;
unsigned int reg;
/* disable clocks we are able to */
__raw_writel(0, SCM_GCCR);
clk32_rate = fref;
reg = __raw_readl(CCM_CSCR);
/* detect clock reference for system PLL */
if (reg & CCM_CSCR_SYSTEM_SEL) {
prem_clk.parent = &clk16m;
} else {
/* ensure that oscillator is disabled */
reg &= ~(1 << CCM_CSCR_OSC_EN_SHIFT);
__raw_writel(reg, CCM_CSCR);
prem_clk.parent = &clk32_premult;
}
/* detect reference for CLKO */
reg = (reg & CCM_CSCR_CLKO_MASK) >> CCM_CSCR_CLKO_OFFSET;
clko_clk.parent = (struct clk *)clko_clocks[reg];
for (clkp = mxc_clks; clkp < mxc_clks + ARRAY_SIZE(mxc_clks); clkp++)
clk_register(*clkp);
clk_enable(&hclk);
clk_enable(&fclk);
return 0;
}