arch/arm/mach-lpc32xx/clock.c

/*
 * arch/arm/mach-lpc32xx/clock.c
 *
 * Author: Kevin Wells <kevin.wells@nxp.com>
 *
 * Copyright (C) 2010 NXP Semiconductors
 *
 * 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/export.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/clkdev.h>

#include <mach/hardware.h>
#include <mach/platform.h>
#include "clock.h"
#include "common.h"

static DEFINE_SPINLOCK(global_clkregs_lock);

static int usb_pll_enable, usb_pll_valid;

static struct clk clk_armpll;
static struct clk clk_usbpll;

static const u32 pll_postdivs[4] = {1, 2, 4, 8};

static unsigned long local_return_parent_rate(struct clk *clk)
{
	while (clk->rate == 0)
		clk = clk->parent;

	return clk->rate;
}

static struct clk osc_32KHz = {
	.rate		= LPC32XX_CLOCK_OSC_FREQ,
	.get_rate	= local_return_parent_rate,
};

static int local_pll397_enable(struct clk *clk, int enable)
{
	u32 reg;
	unsigned long timeout = jiffies + msecs_to_jiffies(10);

	reg = __raw_readl(LPC32XX_CLKPWR_PLL397_CTRL);

	if (enable == 0) {
		reg |= LPC32XX_CLKPWR_SYSCTRL_PLL397_DIS;
		__raw_writel(reg, LPC32XX_CLKPWR_PLL397_CTRL);
	} else {
		
		reg &= ~LPC32XX_CLKPWR_SYSCTRL_PLL397_DIS;
		__raw_writel(reg, LPC32XX_CLKPWR_PLL397_CTRL);

		
		while (((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
			LPC32XX_CLKPWR_SYSCTRL_PLL397_STS) == 0) &&
			time_before(jiffies, timeout))
			cpu_relax();

		if ((__raw_readl(LPC32XX_CLKPWR_PLL397_CTRL) &
			LPC32XX_CLKPWR_SYSCTRL_PLL397_STS) == 0)
			return -ENODEV;
	}

	return 0;
}

static int local_oscmain_enable(struct clk *clk, int enable)
{
	u32 reg;
	unsigned long timeout = jiffies + msecs_to_jiffies(10);

	reg = __raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL);

	if (enable == 0) {
		reg |= LPC32XX_CLKPWR_MOSC_DISABLE;
		__raw_writel(reg, LPC32XX_CLKPWR_MAIN_OSC_CTRL);
	} else {
		
		reg &= ~LPC32XX_CLKPWR_MOSC_DISABLE;
		__raw_writel(reg, LPC32XX_CLKPWR_MAIN_OSC_CTRL);

		
		while (((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
			LPC32XX_CLKPWR_MOSC_DISABLE) != 0) &&
			time_before(jiffies, timeout))
			cpu_relax();

		if ((__raw_readl(LPC32XX_CLKPWR_MAIN_OSC_CTRL) &
			LPC32XX_CLKPWR_MOSC_DISABLE) != 0)
			return -ENODEV;
	}

	return 0;
}

static struct clk osc_pll397 = {
	.parent		= &osc_32KHz,
	.enable		= local_pll397_enable,
	.rate		= LPC32XX_CLOCK_OSC_FREQ * 397,
	.get_rate	= local_return_parent_rate,
};

static struct clk osc_main = {
	.enable		= local_oscmain_enable,
	.rate		= LPC32XX_MAIN_OSC_FREQ,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_sys;

u32 clk_get_pllrate_from_reg(u32 inputclk, u32 regval)
{
	struct clk_pll_setup pllcfg;

	pllcfg.cco_bypass_b15 = 0;
	pllcfg.direct_output_b14 = 0;
	pllcfg.fdbk_div_ctrl_b13 = 0;
	if ((regval & LPC32XX_CLKPWR_HCLKPLL_CCO_BYPASS) != 0)
		pllcfg.cco_bypass_b15 = 1;
	if ((regval & LPC32XX_CLKPWR_HCLKPLL_POSTDIV_BYPASS) != 0)
		pllcfg.direct_output_b14 = 1;
	if ((regval & LPC32XX_CLKPWR_HCLKPLL_FDBK_SEL_FCLK) != 0)
		pllcfg.fdbk_div_ctrl_b13 = 1;
	pllcfg.pll_m = 1 + ((regval >> 1) & 0xFF);
	pllcfg.pll_n = 1 + ((regval >> 9) & 0x3);
	pllcfg.pll_p = pll_postdivs[((regval >> 11) & 0x3)];

	return clk_check_pll_setup(inputclk, &pllcfg);
}

static u32 local_clk_pll_setup(struct clk_pll_setup *PllSetup)
{
	u32 tv, tmp = 0;

	if (PllSetup->analog_on != 0)
		tmp |= LPC32XX_CLKPWR_HCLKPLL_POWER_UP;
	if (PllSetup->cco_bypass_b15 != 0)
		tmp |= LPC32XX_CLKPWR_HCLKPLL_CCO_BYPASS;
	if (PllSetup->direct_output_b14 != 0)
		tmp |= LPC32XX_CLKPWR_HCLKPLL_POSTDIV_BYPASS;
	if (PllSetup->fdbk_div_ctrl_b13 != 0)
		tmp |= LPC32XX_CLKPWR_HCLKPLL_FDBK_SEL_FCLK;

	tv = ffs(PllSetup->pll_p) - 1;
	if ((!is_power_of_2(PllSetup->pll_p)) || (tv > 3))
		return 0;

	tmp |= LPC32XX_CLKPWR_HCLKPLL_POSTDIV_2POW(tv);
	tmp |= LPC32XX_CLKPWR_HCLKPLL_PREDIV_PLUS1(PllSetup->pll_n - 1);
	tmp |= LPC32XX_CLKPWR_HCLKPLL_PLLM(PllSetup->pll_m - 1);

	return tmp;
}

static void local_update_armpll_rate(void)
{
	u32 clkin, pllreg;

	clkin = clk_armpll.parent->rate;
	pllreg = __raw_readl(LPC32XX_CLKPWR_HCLKPLL_CTRL) & 0x1FFFF;

	clk_armpll.rate = clk_get_pllrate_from_reg(clkin, pllreg);
}

static u32 local_clk_find_pll_cfg(u32 pllin_freq, u32 target_freq,
	struct clk_pll_setup *pllsetup)
{
	u32 ifreq, freqtol, m, n, p, fclkout;

	
	freqtol = target_freq / 250;
	ifreq = pllin_freq;

	
	if (abs(pllin_freq - target_freq) <= freqtol) {
		pllsetup->analog_on = 0;
		pllsetup->cco_bypass_b15 = 1;
		pllsetup->direct_output_b14 = 1;
		pllsetup->fdbk_div_ctrl_b13 = 1;
		pllsetup->pll_p = pll_postdivs[0];
		pllsetup->pll_n = 1;
		pllsetup->pll_m = 1;
		return clk_check_pll_setup(ifreq, pllsetup);
	} else if (target_freq <= ifreq) {
		pllsetup->analog_on = 0;
		pllsetup->cco_bypass_b15 = 1;
		pllsetup->direct_output_b14 = 0;
		pllsetup->fdbk_div_ctrl_b13 = 1;
		pllsetup->pll_n = 1;
		pllsetup->pll_m = 1;
		for (p = 0; p <= 3; p++) {
			pllsetup->pll_p = pll_postdivs[p];
			fclkout = clk_check_pll_setup(ifreq, pllsetup);
			if (abs(target_freq - fclkout) <= freqtol)
				return fclkout;
		}
	}

	
	pllsetup->analog_on = 1;
	pllsetup->cco_bypass_b15 = 0;
	pllsetup->direct_output_b14 = 1;
	pllsetup->fdbk_div_ctrl_b13 = 0;
	pllsetup->pll_p = pll_postdivs[0];
	for (m = 1; m <= 256; m++) {
		for (n = 1; n <= 4; n++) {
			
			pllsetup->pll_n = n;
			pllsetup->pll_m = m;
			fclkout = clk_check_pll_setup(ifreq,
				pllsetup);
			if (abs(target_freq - fclkout) <=
				freqtol)
				return fclkout;
		}
	}

	
	pllsetup->analog_on = 1;
	pllsetup->cco_bypass_b15 = 0;
	pllsetup->direct_output_b14 = 0;
	pllsetup->fdbk_div_ctrl_b13 = 1;
	for (m = 1; m <= 256; m++) {
		for (n = 1; n <= 4; n++) {
			for (p = 0; p < 4; p++) {
				
				pllsetup->pll_p = pll_postdivs[p];
				pllsetup->pll_n = n;
				pllsetup->pll_m = m;
				fclkout = clk_check_pll_setup(
					ifreq, pllsetup);
				if (abs(target_freq - fclkout) <= freqtol)
					return fclkout;
			}
		}
	}

	
	pllsetup->analog_on = 1;
	pllsetup->cco_bypass_b15 = 0;
	pllsetup->direct_output_b14 = 0;
	pllsetup->fdbk_div_ctrl_b13 = 0;
	for (m = 1; m <= 256; m++) {
		for (n = 1; n <= 4; n++) {
			for (p = 0; p < 4; p++) {
				
				pllsetup->pll_p = pll_postdivs[p];
				pllsetup->pll_n = n;
				pllsetup->pll_m = m;
				fclkout = clk_check_pll_setup(
					ifreq, pllsetup);
				if (abs(target_freq - fclkout) <= freqtol)
					return fclkout;
			}
		}
	}

	return 0;
}

static struct clk clk_armpll = {
	.parent		= &clk_sys,
	.get_rate	= local_return_parent_rate,
};

static u32 local_clk_usbpll_setup(struct clk_pll_setup *pHCLKPllSetup)
{
	u32 reg, tmp = local_clk_pll_setup(pHCLKPllSetup);

	reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL) & ~0x1FFFF;
	reg |= tmp;
	__raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);

	return clk_check_pll_setup(clk_usbpll.parent->rate,
		pHCLKPllSetup);
}

static int local_usbpll_enable(struct clk *clk, int enable)
{
	u32 reg;
	int ret = 0;
	unsigned long timeout = jiffies + msecs_to_jiffies(20);

	reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);

	__raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN2 |
		LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
		LPC32XX_CLKPWR_USB_CTRL);
	__raw_writel(reg & ~LPC32XX_CLKPWR_USBCTRL_CLK_EN1,
		LPC32XX_CLKPWR_USB_CTRL);

	if (enable && usb_pll_valid && usb_pll_enable) {
		ret = -ENODEV;

		reg |= LPC32XX_CLKPWR_USBCTRL_CLK_EN1;
		__raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);

		reg |= LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP;
		__raw_writel(reg, LPC32XX_CLKPWR_USB_CTRL);

		while (time_before(jiffies, timeout) && (ret == -ENODEV)) {
			reg = __raw_readl(LPC32XX_CLKPWR_USB_CTRL);
			if (reg & LPC32XX_CLKPWR_USBCTRL_PLL_STS)
				ret = 0;
			else
				udelay(10);
		}

		if (ret == 0) {
			__raw_writel(reg | LPC32XX_CLKPWR_USBCTRL_CLK_EN2,
				LPC32XX_CLKPWR_USB_CTRL);
		} else {
			__raw_writel(reg & ~(LPC32XX_CLKPWR_USBCTRL_CLK_EN1 |
				LPC32XX_CLKPWR_USBCTRL_PLL_PWRUP),
				LPC32XX_CLKPWR_USB_CTRL);
		}
	} else if ((enable == 0) && usb_pll_valid  && usb_pll_enable) {
		usb_pll_valid = 0;
		usb_pll_enable = 0;
	}

	return ret;
}

static unsigned long local_usbpll_round_rate(struct clk *clk,
	unsigned long rate)
{
	u32 clkin, usbdiv;
	struct clk_pll_setup pllsetup;

	rate = rate * 1000;

	clkin = clk->get_rate(clk);
	usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
		LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
	clkin = clkin / usbdiv;

	
	if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
		return 0;

	return clk_check_pll_setup(clkin, &pllsetup);
}

static int local_usbpll_set_rate(struct clk *clk, unsigned long rate)
{
	int ret = -ENODEV;
	u32 clkin, usbdiv;
	struct clk_pll_setup pllsetup;

	rate = rate * 1000;

	clkin = clk->get_rate(clk->parent);
	usbdiv = (__raw_readl(LPC32XX_CLKPWR_USBCLK_PDIV) &
		LPC32XX_CLKPWR_USBPDIV_PLL_MASK) + 1;
	clkin = clkin / usbdiv;

	
	if (local_clk_find_pll_cfg(clkin, rate, &pllsetup) == 0)
		return -EINVAL;

	local_usbpll_enable(clk, 0);
	pllsetup.analog_on = 0;
	local_clk_usbpll_setup(&pllsetup);


	usb_pll_valid = 1;
	usb_pll_enable = 1;

	ret = local_usbpll_enable(clk, 1);
	if (ret >= 0)
		clk->rate = clk_check_pll_setup(clkin, &pllsetup);

	return ret;
}

static struct clk clk_usbpll = {
	.parent		= &osc_main,
	.set_rate	= local_usbpll_set_rate,
	.enable		= local_usbpll_enable,
	.rate		= 48000, 
	.get_rate	= local_return_parent_rate,
	.round_rate	= local_usbpll_round_rate,
};

static u32 clk_get_hclk_div(void)
{
	static const u32 hclkdivs[4] = {1, 2, 4, 4};
	return hclkdivs[LPC32XX_CLKPWR_HCLKDIV_DIV_2POW(
		__raw_readl(LPC32XX_CLKPWR_HCLK_DIV))];
}

static struct clk clk_hclk = {
	.parent		= &clk_armpll,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_pclk = {
	.parent		= &clk_armpll,
	.get_rate	= local_return_parent_rate,
};

static int local_onoff_enable(struct clk *clk, int enable)
{
	u32 tmp;

	tmp = __raw_readl(clk->enable_reg);

	if (enable == 0)
		tmp &= ~clk->enable_mask;
	else
		tmp |= clk->enable_mask;

	__raw_writel(tmp, clk->enable_reg);

	return 0;
}

static struct clk clk_timer0 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
	.enable_mask	= LPC32XX_CLKPWR_TMRPWMCLK_TIMER0_EN,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_timer1 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
	.enable_mask	= LPC32XX_CLKPWR_TMRPWMCLK_TIMER1_EN,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_timer2 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
	.enable_mask	= LPC32XX_CLKPWR_TMRPWMCLK_TIMER2_EN,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_timer3 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_TIMERS_PWMS_CLK_CTRL_1,
	.enable_mask	= LPC32XX_CLKPWR_TMRPWMCLK_TIMER3_EN,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_wdt = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_TIMER_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_PWMCLK_WDOG_EN,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_vfp9 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_DEBUG_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_VFP_CLOCK_ENABLE_BIT,
	.get_rate	= local_return_parent_rate,
};
static struct clk clk_dma = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_DMA_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_DMACLKCTRL_CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_uart3 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_UART_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_UARTCLKCTRL_UART3_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_uart4 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_UART_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_UARTCLKCTRL_UART4_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_uart5 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_UART_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_UARTCLKCTRL_UART5_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_uart6 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_UART_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_UARTCLKCTRL_UART6_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_i2c0 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_I2C_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_I2CCLK_I2C1CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_i2c1 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_I2C_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_I2CCLK_I2C2CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_i2c2 = {
	.parent		= &clk_pclk,
	.enable		= local_onoff_enable,
	.enable_reg	= io_p2v(LPC32XX_USB_BASE + 0xFF4),
	.enable_mask	= 0x4,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_ssp0 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_SSP_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_SSPCTRL_SSPCLK0_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_ssp1 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_SSP_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_SSPCTRL_SSPCLK1_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_kscan = {
	.parent		= &osc_32KHz,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_KEY_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_KEYCLKCTRL_CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_nand = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_NAND_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_NANDCLK_SLCCLK_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_i2s0 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_I2S_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_I2SCTRL_I2SCLK0_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_i2s1 = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_I2S_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_I2SCTRL_I2SCLK1_EN,
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_net = {
	.parent		= &clk_hclk,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_MACCLK_CTRL,
	.enable_mask	= (LPC32XX_CLKPWR_MACCTRL_DMACLK_EN |
		LPC32XX_CLKPWR_MACCTRL_MMIOCLK_EN |
		LPC32XX_CLKPWR_MACCTRL_HRCCLK_EN),
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_rtc = {
	.parent		= &osc_32KHz,
	.rate		= 1, 
	.get_rate	= local_return_parent_rate,
};

static struct clk clk_usbd = {
	.parent		= &clk_usbpll,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_USB_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_USBCTRL_HCLK_EN,
	.get_rate	= local_return_parent_rate,
};

static int tsc_onoff_enable(struct clk *clk, int enable)
{
	u32 tmp;

	
	tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
	tmp &= ~LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
	__raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);

	if (enable == 0)
		__raw_writel(0, clk->enable_reg);
	else
		__raw_writel(clk->enable_mask, clk->enable_reg);

	return 0;
}

static struct clk clk_tsc = {
	.parent		= &osc_32KHz,
	.enable		= tsc_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_ADC_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static int adc_onoff_enable(struct clk *clk, int enable)
{
	u32 tmp;
	u32 divider;

	
	tmp = __raw_readl(LPC32XX_CLKPWR_ADC_CLK_CTRL_1);
	tmp |= LPC32XX_CLKPWR_ADCCTRL1_PCLK_SEL;
	divider = clk->get_rate(clk) / 4500000 + 1;
	tmp |= divider;
	__raw_writel(tmp, LPC32XX_CLKPWR_ADC_CLK_CTRL_1);

	
	clk->rate = clk->get_rate(clk->parent) / divider;

	if (enable == 0)
		__raw_writel(0, clk->enable_reg);
	else
		__raw_writel(clk->enable_mask, clk->enable_reg);

	return 0;
}

static struct clk clk_adc = {
	.parent		= &clk_pclk,
	.enable		= adc_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_ADC_CLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_ADC32CLKCTRL_CLK_EN,
	.get_rate	= local_return_parent_rate,
};

static int mmc_onoff_enable(struct clk *clk, int enable)
{
	u32 tmp;

	tmp = __raw_readl(LPC32XX_CLKPWR_MS_CTRL) &
		~LPC32XX_CLKPWR_MSCARD_SDCARD_EN;

	
	if (enable != 0)
		tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_EN;

	__raw_writel(tmp, LPC32XX_CLKPWR_MS_CTRL);

	return 0;
}

static unsigned long mmc_get_rate(struct clk *clk)
{
	u32 div, rate, oldclk;

	
	oldclk = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
	__raw_writel(oldclk | LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
		LPC32XX_CLKPWR_MS_CTRL);
	div = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
	__raw_writel(oldclk, LPC32XX_CLKPWR_MS_CTRL);

	
	rate = clk->parent->get_rate(clk->parent);

	
	div = div & LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(0xf);

	if (!div)
		div = 1;

	return rate / div;
}

static unsigned long mmc_round_rate(struct clk *clk, unsigned long rate)
{
	unsigned long div, prate;

	
	prate = clk->parent->get_rate(clk->parent);

	if (rate >= prate)
		return prate;

	div = prate / rate;
	if (div > 0xf)
		div = 0xf;

	return prate / div;
}

static int mmc_set_rate(struct clk *clk, unsigned long rate)
{
	u32 oldclk, tmp;
	unsigned long prate, div, crate = mmc_round_rate(clk, rate);

	prate = clk->parent->get_rate(clk->parent);

	div = prate / crate;

	
	oldclk = __raw_readl(LPC32XX_CLKPWR_MS_CTRL);
	__raw_writel(oldclk | LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
		LPC32XX_CLKPWR_MS_CTRL);
	tmp = __raw_readl(LPC32XX_CLKPWR_MS_CTRL) &
		~LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(0xf);
	tmp |= LPC32XX_CLKPWR_MSCARD_SDCARD_DIV(div);
	__raw_writel(tmp, LPC32XX_CLKPWR_MS_CTRL);

	__raw_writel(oldclk, LPC32XX_CLKPWR_MS_CTRL);

	return 0;
}

static struct clk clk_mmc = {
	.parent		= &clk_armpll,
	.set_rate	= mmc_set_rate,
	.get_rate	= mmc_get_rate,
	.round_rate	= mmc_round_rate,
	.enable		= mmc_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_MS_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_MSCARD_SDCARD_EN,
};

static unsigned long clcd_get_rate(struct clk *clk)
{
	u32 tmp, div, rate, oldclk;

	
	oldclk = __raw_readl(LPC32XX_CLKPWR_LCDCLK_CTRL);
	__raw_writel(oldclk | LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
		LPC32XX_CLKPWR_LCDCLK_CTRL);
	tmp = __raw_readl(io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2));
	__raw_writel(oldclk, LPC32XX_CLKPWR_LCDCLK_CTRL);

	rate = clk->parent->get_rate(clk->parent);

	
	if (tmp & TIM2_BCD)
		return rate;

	div = (tmp & 0x1F) | ((tmp & 0xF8) >> 22);
	tmp = rate / (2 + div);

	return tmp;
}

static int clcd_set_rate(struct clk *clk, unsigned long rate)
{
	u32 tmp, prate, div, oldclk;

	
	oldclk = __raw_readl(LPC32XX_CLKPWR_LCDCLK_CTRL);
	__raw_writel(oldclk | LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
		LPC32XX_CLKPWR_LCDCLK_CTRL);

	tmp = __raw_readl(io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2)) | TIM2_BCD;
	prate = clk->parent->get_rate(clk->parent);

	if (rate < prate) {
		
		div = prate / rate;
		if (div >= 2) {
			div -= 2;
			tmp &= ~TIM2_BCD;
		}

		tmp &= ~(0xF800001F);
		tmp |= (div & 0x1F);
		tmp |= (((div >> 5) & 0x1F) << 27);
	}

	__raw_writel(tmp, io_p2v(LPC32XX_LCD_BASE + CLCD_TIM2));
	__raw_writel(oldclk, LPC32XX_CLKPWR_LCDCLK_CTRL);

	return 0;
}

static unsigned long clcd_round_rate(struct clk *clk, unsigned long rate)
{
	u32 prate, div;

	prate = clk->parent->get_rate(clk->parent);

	if (rate >= prate)
		rate = prate;
	else {
		div = prate / rate;
		if (div > 0x3ff)
			div = 0x3ff;

		rate = prate / div;
	}

	return rate;
}

static struct clk clk_lcd = {
	.parent		= &clk_hclk,
	.set_rate	= clcd_set_rate,
	.get_rate	= clcd_get_rate,
	.round_rate	= clcd_round_rate,
	.enable		= local_onoff_enable,
	.enable_reg	= LPC32XX_CLKPWR_LCDCLK_CTRL,
	.enable_mask	= LPC32XX_CLKPWR_LCDCTRL_CLK_EN,
};

static void local_clk_disable(struct clk *clk)
{
	
	if (clk->usecount > 0) {
		clk->usecount--;

		
		if ((clk->usecount == 0) && (clk->enable))
			clk->enable(clk, 0);

		
		if (clk->parent)
			local_clk_disable(clk->parent);
	}
}

static int local_clk_enable(struct clk *clk)
{
	int ret = 0;

	
	if (clk->parent)
		ret = local_clk_enable(clk->parent);

	if (!ret) {
		
		if ((clk->usecount == 0) && (clk->enable))
			ret = clk->enable(clk, 1);

		if (!ret)
			clk->usecount++;
		else if (clk->parent)
			local_clk_disable(clk->parent);
	}

	return ret;
}

int clk_enable(struct clk *clk)
{
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&global_clkregs_lock, flags);
	ret = local_clk_enable(clk);
	spin_unlock_irqrestore(&global_clkregs_lock, flags);

	return ret;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
	unsigned long flags;

	spin_lock_irqsave(&global_clkregs_lock, flags);
	local_clk_disable(clk);
	spin_unlock_irqrestore(&global_clkregs_lock, flags);
}
EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
	return clk->get_rate(clk);
}
EXPORT_SYMBOL(clk_get_rate);

int clk_set_rate(struct clk *clk, unsigned long rate)
{
	int ret = -EINVAL;

	if (clk->set_rate)
		ret = clk->set_rate(clk, rate);

	return ret;
}
EXPORT_SYMBOL(clk_set_rate);

long clk_round_rate(struct clk *clk, unsigned long rate)
{
	if (clk->round_rate)
		rate = clk->round_rate(clk, rate);
	else
		rate = clk->get_rate(clk);

	return rate;
}
EXPORT_SYMBOL(clk_round_rate);

int clk_set_parent(struct clk *clk, struct clk *parent)
{
	
	return -EINVAL;
}
EXPORT_SYMBOL(clk_set_parent);

struct clk *clk_get_parent(struct clk *clk)
{
	return clk->parent;
}
EXPORT_SYMBOL(clk_get_parent);

#define _REGISTER_CLOCK(d, n, c) \
	{ \
		.dev_id = (d), \
		.con_id = (n), \
		.clk = &(c), \
	},

static struct clk_lookup lookups[] = {
	_REGISTER_CLOCK(NULL, "osc_32KHz", osc_32KHz)
	_REGISTER_CLOCK(NULL, "osc_pll397", osc_pll397)
	_REGISTER_CLOCK(NULL, "osc_main", osc_main)
	_REGISTER_CLOCK(NULL, "sys_ck", clk_sys)
	_REGISTER_CLOCK(NULL, "arm_pll_ck", clk_armpll)
	_REGISTER_CLOCK(NULL, "ck_pll5", clk_usbpll)
	_REGISTER_CLOCK(NULL, "hclk_ck", clk_hclk)
	_REGISTER_CLOCK(NULL, "pclk_ck", clk_pclk)
	_REGISTER_CLOCK(NULL, "timer0_ck", clk_timer0)
	_REGISTER_CLOCK(NULL, "timer1_ck", clk_timer1)
	_REGISTER_CLOCK(NULL, "timer2_ck", clk_timer2)
	_REGISTER_CLOCK(NULL, "timer3_ck", clk_timer3)
	_REGISTER_CLOCK(NULL, "vfp9_ck", clk_vfp9)
	_REGISTER_CLOCK(NULL, "clk_dmac", clk_dma)
	_REGISTER_CLOCK("pnx4008-watchdog", NULL, clk_wdt)
	_REGISTER_CLOCK(NULL, "uart3_ck", clk_uart3)
	_REGISTER_CLOCK(NULL, "uart4_ck", clk_uart4)
	_REGISTER_CLOCK(NULL, "uart5_ck", clk_uart5)
	_REGISTER_CLOCK(NULL, "uart6_ck", clk_uart6)
	_REGISTER_CLOCK("pnx-i2c.0", NULL, clk_i2c0)
	_REGISTER_CLOCK("pnx-i2c.1", NULL, clk_i2c1)
	_REGISTER_CLOCK("pnx-i2c.2", NULL, clk_i2c2)
	_REGISTER_CLOCK("dev:ssp0", NULL, clk_ssp0)
	_REGISTER_CLOCK("dev:ssp1", NULL, clk_ssp1)
	_REGISTER_CLOCK("lpc32xx_keys.0", NULL, clk_kscan)
	_REGISTER_CLOCK("lpc32xx-nand.0", "nand_ck", clk_nand)
	_REGISTER_CLOCK("lpc32xx-adc", NULL, clk_adc)
	_REGISTER_CLOCK(NULL, "i2s0_ck", clk_i2s0)
	_REGISTER_CLOCK(NULL, "i2s1_ck", clk_i2s1)
	_REGISTER_CLOCK("ts-lpc32xx", NULL, clk_tsc)
	_REGISTER_CLOCK("dev:mmc0", NULL, clk_mmc)
	_REGISTER_CLOCK("lpc-eth.0", NULL, clk_net)
	_REGISTER_CLOCK("dev:clcd", NULL, clk_lcd)
	_REGISTER_CLOCK("lpc32xx_udc", "ck_usbd", clk_usbd)
	_REGISTER_CLOCK("lpc32xx_rtc", NULL, clk_rtc)
};

static int __init clk_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(lookups); i++)
		clkdev_add(&lookups[i]);

	if (clk_is_sysclk_mainosc() != 0)
		clk_sys.parent = &osc_main;
	else
		clk_sys.parent = &osc_pll397;

	clk_sys.rate = clk_sys.parent->rate;

	
	local_update_armpll_rate();

	
	clk_hclk.rate = clk_hclk.parent->rate / clk_get_hclk_div();
	clk_pclk.rate = clk_pclk.parent->rate / clk_get_pclk_div();

	if (clk_enable(&clk_hclk) || clk_enable(&clk_pclk))
		printk(KERN_ERR "Error enabling system HCLK and PCLK\n");

	if (clk_enable(&clk_timer0) || clk_enable(&clk_timer1))
		printk(KERN_ERR "Error enabling timer tick clocks\n");

	return 0;
}
core_initcall(clk_init);