ARM: 5657/1: bcmring: add csp chipc block source code

add csp chipc block source code
Signed-off-by: Leo Chen <leochen@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-bcmring/csp/chipc/Makefile

+obj-y += chipcHw.o chipcHw_str.o chipcHw_reset.o chipcHw_init.o

arch/arm/mach-bcmring/csp/chipc/chipcHw.c

+/*****************************************************************************
+* Copyright 2003 - 2008 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/****************************************************************************/
+/**
+*  @file    chipcHw.c
+*
+*  @brief   Low level Various CHIP clock controlling routines
+*
+*  @note
+*
+*   These routines provide basic clock controlling functionality only.
+*/
+/****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+
+#include <csp/errno.h>
+#include <csp/stdint.h>
+#include <csp/module.h>
+
+#include <mach/csp/chipcHw_def.h>
+#include <mach/csp/chipcHw_inline.h>
+
+#include <csp/reg.h>
+#include <csp/delay.h>
+
+/* ---- Private Constants and Types --------------------------------------- */
+
+/* VPM alignment algorithm uses this */
+#define MAX_PHASE_ADJUST_COUNT         0xFFFF	/* Max number of times allowed to adjust the phase */
+#define MAX_PHASE_ALIGN_ATTEMPTS       10	/* Max number of attempt to align the phase */
+
+/* Local definition of clock type */
+#define PLL_CLOCK                      1	/* PLL Clock */
+#define NON_PLL_CLOCK                  2	/* Divider clock */
+
+static int chipcHw_divide(int num, int denom)
+    __attribute__ ((section(".aramtext")));
+
+/****************************************************************************/
+/**
+*  @brief   Set clock fequency for miscellaneous configurable clocks
+*
+*  This function sets clock frequency
+*
+*  @return  Configured clock frequency in hertz
+*
+*/
+/****************************************************************************/
+chipcHw_freq chipcHw_getClockFrequency(chipcHw_CLOCK_e clock	/*  [ IN ] Configurable clock */
+    ) {
+	volatile uint32_t *pPLLReg = (uint32_t *) 0x0;
+	volatile uint32_t *pClockCtrl = (uint32_t *) 0x0;
+	volatile uint32_t *pDependentClock = (uint32_t *) 0x0;
+	uint32_t vcoFreqPll1Hz = 0;	/* Effective VCO frequency for PLL1 in Hz */
+	uint32_t vcoFreqPll2Hz = 0;	/* Effective VCO frequency for PLL2 in Hz */
+	uint32_t dependentClockType = 0;
+	uint32_t vcoHz = 0;
+
+	/* Get VCO frequencies */
+	if ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_MASK) != chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_INTEGER) {
+		uint64_t adjustFreq = 0;
+
+		vcoFreqPll1Hz = chipcHw_XTAL_FREQ_Hz *
+		    chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+		    ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+		     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+
+		/* Adjusted frequency due to chipcHw_REG_PLL_DIVIDER_NDIV_f_SS */
+		adjustFreq = (uint64_t) chipcHw_XTAL_FREQ_Hz *
+			(uint64_t) chipcHw_REG_PLL_DIVIDER_NDIV_f_SS *
+			chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, (chipcHw_REG_PLL_PREDIVIDER_P2 * (uint64_t) chipcHw_REG_PLL_DIVIDER_FRAC));
+		vcoFreqPll1Hz += (uint32_t) adjustFreq;
+	} else {
+		vcoFreqPll1Hz = chipcHw_XTAL_FREQ_Hz *
+		    chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+		    ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+		     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+	}
+	vcoFreqPll2Hz =
+	    chipcHw_XTAL_FREQ_Hz *
+		 chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+	    ((pChipcHw->PLLPreDivider2 & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+	     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+
+	switch (clock) {
+	case chipcHw_CLOCK_DDR:
+		pPLLReg = &pChipcHw->DDRClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ARM:
+		pPLLReg = &pChipcHw->ARMClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ESW:
+		pPLLReg = &pChipcHw->ESWClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_VPM:
+		pPLLReg = &pChipcHw->VPMClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ESW125:
+		pPLLReg = &pChipcHw->ESW125Clock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_UART:
+		pPLLReg = &pChipcHw->UARTClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SDIO0:
+		pPLLReg = &pChipcHw->SDIO0Clock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SDIO1:
+		pPLLReg = &pChipcHw->SDIO1Clock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SPI:
+		pPLLReg = &pChipcHw->SPIClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ETM:
+		pPLLReg = &pChipcHw->ETMClock;
+		vcoHz = vcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_USB:
+		pPLLReg = &pChipcHw->USBClock;
+		vcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_LCD:
+		pPLLReg = &pChipcHw->LCDClock;
+		vcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_APM:
+		pPLLReg = &pChipcHw->APMClock;
+		vcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_BUS:
+		pClockCtrl = &pChipcHw->ACLKClock;
+		pDependentClock = &pChipcHw->ARMClock;
+		vcoHz = vcoFreqPll1Hz;
+		dependentClockType = PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_OTP:
+		pClockCtrl = &pChipcHw->OTPClock;
+		break;
+	case chipcHw_CLOCK_I2C:
+		pClockCtrl = &pChipcHw->I2CClock;
+		break;
+	case chipcHw_CLOCK_I2S0:
+		pClockCtrl = &pChipcHw->I2S0Clock;
+		break;
+	case chipcHw_CLOCK_RTBUS:
+		pClockCtrl = &pChipcHw->RTBUSClock;
+		pDependentClock = &pChipcHw->ACLKClock;
+		dependentClockType = NON_PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_APM100:
+		pClockCtrl = &pChipcHw->APM100Clock;
+		pDependentClock = &pChipcHw->APMClock;
+		vcoHz = vcoFreqPll2Hz;
+		dependentClockType = PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_TSC:
+		pClockCtrl = &pChipcHw->TSCClock;
+		break;
+	case chipcHw_CLOCK_LED:
+		pClockCtrl = &pChipcHw->LEDClock;
+		break;
+	case chipcHw_CLOCK_I2S1:
+		pClockCtrl = &pChipcHw->I2S1Clock;
+		break;
+	}
+
+	if (pPLLReg) {
+		/* Obtain PLL clock frequency */
+		if (*pPLLReg & chipcHw_REG_PLL_CLOCK_BYPASS_SELECT) {
+			/* Return crystal clock frequency when bypassed */
+			return chipcHw_XTAL_FREQ_Hz;
+		} else if (clock == chipcHw_CLOCK_DDR) {
+			/* DDR frequency is configured in PLLDivider register */
+			return chipcHw_divide (vcoHz, (((pChipcHw->PLLDivider & 0xFF000000) >> 24) ? ((pChipcHw->PLLDivider & 0xFF000000) >> 24) : 256));
+		} else {
+			/* From chip revision number B0, LCD clock is internally divided by 2 */
+			if ((pPLLReg == &pChipcHw->LCDClock) && (chipcHw_getChipRevisionNumber() != chipcHw_REV_NUMBER_A0)) {
+				vcoHz >>= 1;
+			}
+			/* Obtain PLL clock frequency using VCO dividers */
+			return chipcHw_divide(vcoHz, ((*pPLLReg & chipcHw_REG_PLL_CLOCK_MDIV_MASK) ? (*pPLLReg & chipcHw_REG_PLL_CLOCK_MDIV_MASK) : 256));
+		}
+	} else if (pClockCtrl) {
+		/* Obtain divider clock frequency */
+		uint32_t div;
+		uint32_t freq = 0;
+
+		if (*pClockCtrl & chipcHw_REG_DIV_CLOCK_BYPASS_SELECT) {
+			/* Return crystal clock frequency when bypassed */
+			return chipcHw_XTAL_FREQ_Hz;
+		} else if (pDependentClock) {
+			/* Identify the dependent clock frequency */
+			switch (dependentClockType) {
+			case PLL_CLOCK:
+				if (*pDependentClock & chipcHw_REG_PLL_CLOCK_BYPASS_SELECT) {
+					/* Use crystal clock frequency when dependent PLL clock is bypassed */
+					freq = chipcHw_XTAL_FREQ_Hz;
+				} else {
+					/* Obtain PLL clock frequency using VCO dividers */
+					div = *pDependentClock & chipcHw_REG_PLL_CLOCK_MDIV_MASK;
+					freq = div ? chipcHw_divide(vcoHz, div) : 0;
+				}
+				break;
+			case NON_PLL_CLOCK:
+				if (pDependentClock == (uint32_t *) &pChipcHw->ACLKClock) {
+					freq = chipcHw_getClockFrequency (chipcHw_CLOCK_BUS);
+				} else {
+					if (*pDependentClock & chipcHw_REG_DIV_CLOCK_BYPASS_SELECT) {
+						/* Use crystal clock frequency when dependent divider clock is bypassed */
+						freq = chipcHw_XTAL_FREQ_Hz;
+					} else {
+						/* Obtain divider clock frequency using XTAL dividers */
+						div = *pDependentClock & chipcHw_REG_DIV_CLOCK_DIV_MASK;
+						freq = chipcHw_divide (chipcHw_XTAL_FREQ_Hz, (div ? div : 256));
+					}
+				}
+				break;
+			}
+		} else {
+			/* Dependent on crystal clock */
+			freq = chipcHw_XTAL_FREQ_Hz;
+		}
+
+		div = *pClockCtrl & chipcHw_REG_DIV_CLOCK_DIV_MASK;
+		return chipcHw_divide(freq, (div ? div : 256));
+	}
+	return 0;
+}
+
+/****************************************************************************/
+/**
+*  @brief   Set clock fequency for miscellaneous configurable clocks
+*
+*  This function sets clock frequency
+*
+*  @return  Configured clock frequency in Hz
+*
+*/
+/****************************************************************************/
+chipcHw_freq chipcHw_setClockFrequency(chipcHw_CLOCK_e clock,	/*  [ IN ] Configurable clock */
+				       uint32_t freq	/*  [ IN ] Clock frequency in Hz */
+    ) {
+	volatile uint32_t *pPLLReg = (uint32_t *) 0x0;
+	volatile uint32_t *pClockCtrl = (uint32_t *) 0x0;
+	volatile uint32_t *pDependentClock = (uint32_t *) 0x0;
+	uint32_t vcoFreqPll1Hz = 0;	/* Effective VCO frequency for PLL1 in Hz */
+	uint32_t desVcoFreqPll1Hz = 0;	/* Desired VCO frequency for PLL1 in Hz */
+	uint32_t vcoFreqPll2Hz = 0;	/* Effective VCO frequency for PLL2 in Hz */
+	uint32_t dependentClockType = 0;
+	uint32_t vcoHz = 0;
+	uint32_t desVcoHz = 0;
+
+	/* Get VCO frequencies */
+	if ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_MASK) != chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_INTEGER) {
+		uint64_t adjustFreq = 0;
+
+		vcoFreqPll1Hz = chipcHw_XTAL_FREQ_Hz *
+		    chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+		    ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+		     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+
+		/* Adjusted frequency due to chipcHw_REG_PLL_DIVIDER_NDIV_f_SS */
+		adjustFreq = (uint64_t) chipcHw_XTAL_FREQ_Hz *
+			(uint64_t) chipcHw_REG_PLL_DIVIDER_NDIV_f_SS *
+			chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, (chipcHw_REG_PLL_PREDIVIDER_P2 * (uint64_t) chipcHw_REG_PLL_DIVIDER_FRAC));
+		vcoFreqPll1Hz += (uint32_t) adjustFreq;
+
+		/* Desired VCO frequency */
+		desVcoFreqPll1Hz = chipcHw_XTAL_FREQ_Hz *
+		    chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+		    (((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+		      chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT) + 1);
+	} else {
+		vcoFreqPll1Hz = desVcoFreqPll1Hz = chipcHw_XTAL_FREQ_Hz *
+		    chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+		    ((pChipcHw->PLLPreDivider & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+		     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+	}
+	vcoFreqPll2Hz = chipcHw_XTAL_FREQ_Hz * chipcHw_divide(chipcHw_REG_PLL_PREDIVIDER_P1, chipcHw_REG_PLL_PREDIVIDER_P2) *
+	    ((pChipcHw->PLLPreDivider2 & chipcHw_REG_PLL_PREDIVIDER_NDIV_MASK) >>
+	     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT);
+
+	switch (clock) {
+	case chipcHw_CLOCK_DDR:
+		/* Configure the DDR_ctrl:BUS ratio settings */
+		{
+			REG_LOCAL_IRQ_SAVE;
+			/* Dvide DDR_phy by two to obtain DDR_ctrl clock */
+			pChipcHw->DDRClock = (pChipcHw->DDRClock & ~chipcHw_REG_PLL_CLOCK_TO_BUS_RATIO_MASK) | ((((freq / 2) / chipcHw_getClockFrequency(chipcHw_CLOCK_BUS)) - 1)
+				<< chipcHw_REG_PLL_CLOCK_TO_BUS_RATIO_SHIFT);
+			REG_LOCAL_IRQ_RESTORE;
+		}
+		pPLLReg = &pChipcHw->DDRClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ARM:
+		pPLLReg = &pChipcHw->ARMClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ESW:
+		pPLLReg = &pChipcHw->ESWClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_VPM:
+		/* Configure the VPM:BUS ratio settings */
+		{
+			REG_LOCAL_IRQ_SAVE;
+			pChipcHw->VPMClock = (pChipcHw->VPMClock & ~chipcHw_REG_PLL_CLOCK_TO_BUS_RATIO_MASK) | ((chipcHw_divide (freq, chipcHw_getClockFrequency(chipcHw_CLOCK_BUS)) - 1)
+				<< chipcHw_REG_PLL_CLOCK_TO_BUS_RATIO_SHIFT);
+			REG_LOCAL_IRQ_RESTORE;
+		}
+		pPLLReg = &pChipcHw->VPMClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ESW125:
+		pPLLReg = &pChipcHw->ESW125Clock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_UART:
+		pPLLReg = &pChipcHw->UARTClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SDIO0:
+		pPLLReg = &pChipcHw->SDIO0Clock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SDIO1:
+		pPLLReg = &pChipcHw->SDIO1Clock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_SPI:
+		pPLLReg = &pChipcHw->SPIClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_ETM:
+		pPLLReg = &pChipcHw->ETMClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		break;
+	case chipcHw_CLOCK_USB:
+		pPLLReg = &pChipcHw->USBClock;
+		vcoHz = vcoFreqPll2Hz;
+		desVcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_LCD:
+		pPLLReg = &pChipcHw->LCDClock;
+		vcoHz = vcoFreqPll2Hz;
+		desVcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_APM:
+		pPLLReg = &pChipcHw->APMClock;
+		vcoHz = vcoFreqPll2Hz;
+		desVcoHz = vcoFreqPll2Hz;
+		break;
+	case chipcHw_CLOCK_BUS:
+		pClockCtrl = &pChipcHw->ACLKClock;
+		pDependentClock = &pChipcHw->ARMClock;
+		vcoHz = vcoFreqPll1Hz;
+		desVcoHz = desVcoFreqPll1Hz;
+		dependentClockType = PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_OTP:
+		pClockCtrl = &pChipcHw->OTPClock;
+		break;
+	case chipcHw_CLOCK_I2C:
+		pClockCtrl = &pChipcHw->I2CClock;
+		break;
+	case chipcHw_CLOCK_I2S0:
+		pClockCtrl = &pChipcHw->I2S0Clock;
+		break;
+	case chipcHw_CLOCK_RTBUS:
+		pClockCtrl = &pChipcHw->RTBUSClock;
+		pDependentClock = &pChipcHw->ACLKClock;
+		dependentClockType = NON_PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_APM100:
+		pClockCtrl = &pChipcHw->APM100Clock;
+		pDependentClock = &pChipcHw->APMClock;
+		vcoHz = vcoFreqPll2Hz;
+		desVcoHz = vcoFreqPll2Hz;
+		dependentClockType = PLL_CLOCK;
+		break;
+	case chipcHw_CLOCK_TSC:
+		pClockCtrl = &pChipcHw->TSCClock;
+		break;
+	case chipcHw_CLOCK_LED:
+		pClockCtrl = &pChipcHw->LEDClock;
+		break;
+	case chipcHw_CLOCK_I2S1:
+		pClockCtrl = &pChipcHw->I2S1Clock;
+		break;
+	}
+
+	if (pPLLReg) {
+		/* Select XTAL as bypass source */
+		reg32_modify_and(pPLLReg, ~chipcHw_REG_PLL_CLOCK_SOURCE_GPIO);
+		reg32_modify_or(pPLLReg, chipcHw_REG_PLL_CLOCK_BYPASS_SELECT);
+		/* For DDR settings use only the PLL divider clock */
+		if (pPLLReg == &pChipcHw->DDRClock) {
+			/* Set M1DIV for PLL1, which controls the DDR clock */
+			reg32_write(&pChipcHw->PLLDivider, (pChipcHw->PLLDivider & 0x00FFFFFF) | ((chipcHw_REG_PLL_DIVIDER_MDIV (desVcoHz, freq)) << 24));
+			/* Calculate expected frequency */
+			freq = chipcHw_divide(vcoHz, (((pChipcHw->PLLDivider & 0xFF000000) >> 24) ? ((pChipcHw->PLLDivider & 0xFF000000) >> 24) : 256));
+		} else {
+			/* From chip revision number B0, LCD clock is internally divided by 2 */
+			if ((pPLLReg == &pChipcHw->LCDClock) && (chipcHw_getChipRevisionNumber() != chipcHw_REV_NUMBER_A0)) {
+				desVcoHz >>= 1;
+				vcoHz >>= 1;
+			}
+			/* Set MDIV to change the frequency */
+			reg32_modify_and(pPLLReg, ~(chipcHw_REG_PLL_CLOCK_MDIV_MASK));
+			reg32_modify_or(pPLLReg, chipcHw_REG_PLL_DIVIDER_MDIV(desVcoHz, freq));
+			/* Calculate expected frequency */
+			freq = chipcHw_divide(vcoHz, ((*(pPLLReg) & chipcHw_REG_PLL_CLOCK_MDIV_MASK) ? (*(pPLLReg) & chipcHw_REG_PLL_CLOCK_MDIV_MASK) : 256));
+		}
+		/* Wait for for atleast 200ns as per the protocol to change frequency */
+		udelay(1);
+		/* Do not bypass */
+		reg32_modify_and(pPLLReg, ~chipcHw_REG_PLL_CLOCK_BYPASS_SELECT);
+		/* Return the configured frequency */
+		return freq;
+	} else if (pClockCtrl) {
+		uint32_t divider = 0;
+
+		/* Divider clock should not be bypassed  */
+		reg32_modify_and(pClockCtrl,
+				 ~chipcHw_REG_DIV_CLOCK_BYPASS_SELECT);
+
+		/* Identify the clock source */
+		if (pDependentClock) {
+			switch (dependentClockType) {
+			case PLL_CLOCK:
+				divider = chipcHw_divide(chipcHw_divide (desVcoHz, (*pDependentClock & chipcHw_REG_PLL_CLOCK_MDIV_MASK)), freq);
+				break;
+			case NON_PLL_CLOCK:
+				{
+					uint32_t sourceClock = 0;
+
+					if (pDependentClock == (uint32_t *) &pChipcHw->ACLKClock) {
+						sourceClock = chipcHw_getClockFrequency (chipcHw_CLOCK_BUS);
+					} else {
+						uint32_t div = *pDependentClock & chipcHw_REG_DIV_CLOCK_DIV_MASK;
+						sourceClock = chipcHw_divide (chipcHw_XTAL_FREQ_Hz, ((div) ? div : 256));
+					}
+					divider = chipcHw_divide(sourceClock, freq);
+				}
+				break;
+			}
+		} else {
+			divider = chipcHw_divide(chipcHw_XTAL_FREQ_Hz, freq);
+		}
+
+		if (divider) {
+			REG_LOCAL_IRQ_SAVE;
+			/* Set the divider to obtain the required frequency */
+			*pClockCtrl = (*pClockCtrl & (~chipcHw_REG_DIV_CLOCK_DIV_MASK)) | (((divider > 256) ? chipcHw_REG_DIV_CLOCK_DIV_256 : divider) & chipcHw_REG_DIV_CLOCK_DIV_MASK);
+			REG_LOCAL_IRQ_RESTORE;
+			return freq;
+		}
+	}
+
+	return 0;
+}
+
+EXPORT_SYMBOL(chipcHw_setClockFrequency);
+
+/****************************************************************************/
+/**
+*  @brief   Set VPM clock in sync with BUS clock for Chip Rev #A0
+*
+*  This function does the phase adjustment between VPM and BUS clock
+*
+*  @return >= 0 : On success (# of adjustment required)
+*            -1 : On failure
+*
+*/
+/****************************************************************************/
+static int vpmPhaseAlignA0(void)
+{
+	uint32_t phaseControl;
+	uint32_t phaseValue;
+	uint32_t prevPhaseComp;
+	int iter = 0;
+	int adjustCount = 0;
+	int count = 0;
+
+	for (iter = 0; (iter < MAX_PHASE_ALIGN_ATTEMPTS) && (adjustCount < MAX_PHASE_ADJUST_COUNT); iter++) {
+		phaseControl = (pChipcHw->VPMClock & chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK) >> chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT;
+		phaseValue = 0;
+		prevPhaseComp = 0;
+
+		/* Step 1: Look for falling PH_COMP transition */
+
+		/* Read the contents of VPM Clock resgister */
+		phaseValue = pChipcHw->VPMClock;
+		do {
+			/* Store previous value of phase comparator */
+			prevPhaseComp = phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP;
+			/* Change the value of PH_CTRL. */
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			/* Read the contents of  VPM Clock resgister. */
+			phaseValue = pChipcHw->VPMClock;
+
+			if ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) == 0x0) {
+				phaseControl = (0x3F & (phaseControl - 1));
+			} else {
+				/* Increment to the Phase count value for next write, if Phase is not stable. */
+				phaseControl = (0x3F & (phaseControl + 1));
+			}
+			/* Count number of adjustment made */
+			adjustCount++;
+		} while (((prevPhaseComp == (phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP)) ||	/* Look for a transition */
+			  ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) != 0x0)) &&	/* Look for a falling edge */
+			 (adjustCount < MAX_PHASE_ADJUST_COUNT)	/* Do not exceed the limit while trying */
+		    );
+
+		if (adjustCount >= MAX_PHASE_ADJUST_COUNT) {
+			/* Failed to align VPM phase after MAX_PHASE_ADJUST_COUNT tries */
+			return -1;
+		}
+
+		/* Step 2: Keep moving forward to make sure falling PH_COMP transition was valid */
+
+		for (count = 0; (count < 5) && ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) == 0); count++) {
+			phaseControl = (0x3F & (phaseControl + 1));
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			phaseValue = pChipcHw->VPMClock;
+			/* Count number of adjustment made */
+			adjustCount++;
+		}
+
+		if (adjustCount >= MAX_PHASE_ADJUST_COUNT) {
+			/* Failed to align VPM phase after MAX_PHASE_ADJUST_COUNT tries */
+			return -1;
+		}
+
+		if (count != 5) {
+			/* Detected false transition */
+			continue;
+		}
+
+		/* Step 3: Keep moving backward to make sure falling PH_COMP transition was stable */
+
+		for (count = 0; (count < 3) && ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) == 0); count++) {
+			phaseControl = (0x3F & (phaseControl - 1));
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			phaseValue = pChipcHw->VPMClock;
+			/* Count number of adjustment made */
+			adjustCount++;
+		}
+
+		if (adjustCount >= MAX_PHASE_ADJUST_COUNT) {
+			/* Failed to align VPM phase after MAX_PHASE_ADJUST_COUNT tries */
+			return -1;
+		}
+
+		if (count != 3) {
+			/* Detected noisy transition */
+			continue;
+		}
+
+		/* Step 4: Keep moving backward before the original transition took place. */
+
+		for (count = 0; (count < 5); count++) {
+			phaseControl = (0x3F & (phaseControl - 1));
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			phaseValue = pChipcHw->VPMClock;
+			/* Count number of adjustment made */
+			adjustCount++;
+		}
+
+		if (adjustCount >= MAX_PHASE_ADJUST_COUNT) {
+			/* Failed to align VPM phase after MAX_PHASE_ADJUST_COUNT tries */
+			return -1;
+		}
+
+		if ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) == 0) {
+			/* Detected false transition */
+			continue;
+		}
+
+		/* Step 5: Re discover the valid transition */
+
+		do {
+			/* Store previous value of phase comparator */
+			prevPhaseComp = phaseValue;
+			/* Change the value of PH_CTRL. */
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^=
+			    chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			/* Read the contents of  VPM Clock resgister. */
+			phaseValue = pChipcHw->VPMClock;
+
+			if ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) == 0x0) {
+				phaseControl = (0x3F & (phaseControl - 1));
+			} else {
+				/* Increment to the Phase count value for next write, if Phase is not stable. */
+				phaseControl = (0x3F & (phaseControl + 1));
+			}
+
+			/* Count number of adjustment made */
+			adjustCount++;
+		} while (((prevPhaseComp == (phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP)) || ((phaseValue & chipcHw_REG_PLL_CLOCK_PHASE_COMP) != 0x0)) && (adjustCount < MAX_PHASE_ADJUST_COUNT));
+
+		if (adjustCount >= MAX_PHASE_ADJUST_COUNT) {
+			/* Failed to align VPM phase after MAX_PHASE_ADJUST_COUNT tries  */
+			return -1;
+		} else {
+			/* Valid phase must have detected */
+			break;
+		}
+	}
+
+	/* For VPM Phase should be perfectly aligned. */
+	phaseControl = (((pChipcHw->VPMClock >> chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT) - 1) & 0x3F);
+	{
+		REG_LOCAL_IRQ_SAVE;
+
+		pChipcHw->VPMClock = (pChipcHw->VPMClock & ~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT);
+		/* Load new phase value */
+		pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+
+		REG_LOCAL_IRQ_RESTORE;
+	}
+	/* Return the status */
+	return (int)adjustCount;
+}
+
+/****************************************************************************/
+/**
+*  @brief   Set VPM clock in sync with BUS clock
+*
+*  This function does the phase adjustment between VPM and BUS clock
+*
+*  @return >= 0 : On success (# of adjustment required)
+*            -1 : On failure
+*
+*/
+/****************************************************************************/
+int chipcHw_vpmPhaseAlign(void)
+{
+
+	if (chipcHw_getChipRevisionNumber() == chipcHw_REV_NUMBER_A0) {
+		return vpmPhaseAlignA0();
+	} else {
+		uint32_t phaseControl = chipcHw_getVpmPhaseControl();
+		uint32_t phaseValue = 0;
+		int adjustCount = 0;
+
+		/* Disable VPM access */
+		pChipcHw->Spare1 &= ~chipcHw_REG_SPARE1_VPM_BUS_ACCESS_ENABLE;
+		/* Disable HW VPM phase alignment  */
+		chipcHw_vpmHwPhaseAlignDisable();
+		/* Enable SW VPM phase alignment  */
+		chipcHw_vpmSwPhaseAlignEnable();
+		/* Adjust VPM phase */
+		while (adjustCount < MAX_PHASE_ADJUST_COUNT) {
+			phaseValue = chipcHw_getVpmHwPhaseAlignStatus();
+
+			/* Adjust phase control value */
+			if (phaseValue > 0xF) {
+				/* Increment phase control value */
+				phaseControl++;
+			} else if (phaseValue < 0xF) {
+				/* Decrement phase control value */
+				phaseControl--;
+			} else {
+				/* Enable VPM access */
+				pChipcHw->Spare1 |= chipcHw_REG_SPARE1_VPM_BUS_ACCESS_ENABLE;
+				/* Return adjust count */
+				return adjustCount;
+			}
+			/* Change the value of PH_CTRL. */
+			reg32_write(&pChipcHw->VPMClock, (pChipcHw->VPMClock & (~chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_MASK)) | (phaseControl << chipcHw_REG_PLL_CLOCK_PHASE_CONTROL_SHIFT));
+			/* Wait atleast 20 ns */
+			udelay(1);
+			/* Toggle the LOAD_CH after phase control is written. */
+			pChipcHw->VPMClock ^= chipcHw_REG_PLL_CLOCK_PHASE_UPDATE_ENABLE;
+			/* Count adjustment */
+			adjustCount++;
+		}
+	}
+
+	/* Disable VPM access */
+	pChipcHw->Spare1 &= ~chipcHw_REG_SPARE1_VPM_BUS_ACCESS_ENABLE;
+	return -1;
+}
+
+/****************************************************************************/
+/**
+*  @brief   Local Divide function
+*
+*  This function does the divide
+*
+*  @return divide value
+*
+*/
+/****************************************************************************/
+static int chipcHw_divide(int num, int denom)
+{
+	int r;
+	int t = 1;
+
+	/* Shift denom and t up to the largest value to optimize algorithm */
+	/* t contains the units of each divide */
+	while ((denom & 0x40000000) == 0) {	/* fails if denom=0 */
+		denom = denom << 1;
+		t = t << 1;
+	}
+
+	/* Intialize the result */
+	r = 0;
+
+	do {
+		/* Determine if there exists a positive remainder */
+		if ((num - denom) >= 0) {
+			/* Accumlate t to the result and calculate a new remainder */
+			num = num - denom;
+			r = r + t;
+		}
+		/* Continue to shift denom and shift t down to 0 */
+		denom = denom >> 1;
+		t = t >> 1;
+	} while (t != 0);
+
+	return r;
+}

arch/arm/mach-bcmring/csp/chipc/chipcHw_init.c

+/*****************************************************************************
+* Copyright 2003 - 2008 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/****************************************************************************/
+/**
+*  @file    chipcHw_init.c
+*
+*  @brief   Low level CHIPC PLL configuration functions
+*
+*  @note
+*
+*   These routines provide basic PLL controlling functionality only.
+*/
+/****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+
+#include <csp/errno.h>
+#include <csp/stdint.h>
+#include <csp/module.h>
+
+#include <mach/csp/chipcHw_def.h>
+#include <mach/csp/chipcHw_inline.h>
+
+#include <csp/reg.h>
+#include <csp/delay.h>
+/* ---- Private Constants and Types --------------------------------------- */
+
+/*
+    Calculation for NDIV_i to obtain VCO frequency
+    -----------------------------------------------
+
+	Freq_vco = Freq_ref * (P2 / P1) * (PLL_NDIV_i + PLL_NDIV_f)
+	for Freq_vco = VCO_FREQ_MHz
+		Freq_ref = chipcHw_XTAL_FREQ_Hz
+		PLL_P1 = PLL_P2 = 1
+		and
+		PLL_NDIV_f = 0
+
+	We get:
+		PLL_NDIV_i = Freq_vco / Freq_ref = VCO_FREQ_MHz / chipcHw_XTAL_FREQ_Hz
+
+    Calculation for PLL MDIV to obtain frequency Freq_x for channel x
+    -----------------------------------------------------------------
+		Freq_x = chipcHw_XTAL_FREQ_Hz * PLL_NDIV_i / PLL_MDIV_x = VCO_FREQ_MHz / PLL_MDIV_x
+
+		PLL_MDIV_x = VCO_FREQ_MHz / Freq_x
+*/
+
+/* ---- Private Variables ------------------------------------------------- */
+/****************************************************************************/
+/**
+*  @brief  Initializes the PLL2
+*
+*  This function initializes the PLL2
+*
+*/
+/****************************************************************************/
+void chipcHw_pll2Enable(uint32_t vcoFreqHz)
+{
+	uint32_t pllPreDivider2 = 0;
+
+	{
+		REG_LOCAL_IRQ_SAVE;
+		pChipcHw->PLLConfig2 =
+		    chipcHw_REG_PLL_CONFIG_D_RESET |
+		    chipcHw_REG_PLL_CONFIG_A_RESET;
+
+		pllPreDivider2 = chipcHw_REG_PLL_PREDIVIDER_POWER_DOWN |
+		    chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_INTEGER |
+		    (chipcHw_REG_PLL_PREDIVIDER_NDIV_i(vcoFreqHz) <<
+		     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT) |
+		    (chipcHw_REG_PLL_PREDIVIDER_P1 <<
+		     chipcHw_REG_PLL_PREDIVIDER_P1_SHIFT) |
+		    (chipcHw_REG_PLL_PREDIVIDER_P2 <<
+		     chipcHw_REG_PLL_PREDIVIDER_P2_SHIFT);
+
+		/* Enable CHIPC registers to control the PLL */
+		pChipcHw->PLLStatus |= chipcHw_REG_PLL_STATUS_CONTROL_ENABLE;
+
+		/* Set pre divider to get desired VCO frequency */
+		pChipcHw->PLLPreDivider2 = pllPreDivider2;
+		/* Set NDIV Frac */
+		pChipcHw->PLLDivider2 = chipcHw_REG_PLL_DIVIDER_NDIV_f;
+
+		/* This has to be removed once the default values are fixed for PLL2. */
+		pChipcHw->PLLControl12 = 0x38000700;
+		pChipcHw->PLLControl22 = 0x00000015;
+
+		/* Reset PLL2 */
+		if (vcoFreqHz > chipcHw_REG_PLL_CONFIG_VCO_SPLIT_FREQ) {
+			pChipcHw->PLLConfig2 = chipcHw_REG_PLL_CONFIG_D_RESET |
+			    chipcHw_REG_PLL_CONFIG_A_RESET |
+			    chipcHw_REG_PLL_CONFIG_VCO_1601_3200 |
+			    chipcHw_REG_PLL_CONFIG_POWER_DOWN;
+		} else {
+			pChipcHw->PLLConfig2 = chipcHw_REG_PLL_CONFIG_D_RESET |
+			    chipcHw_REG_PLL_CONFIG_A_RESET |
+			    chipcHw_REG_PLL_CONFIG_VCO_800_1600 |
+			    chipcHw_REG_PLL_CONFIG_POWER_DOWN;
+		}
+		REG_LOCAL_IRQ_RESTORE;
+	}
+
+	/* Insert certain amount of delay before deasserting ARESET. */
+	udelay(1);
+
+	{
+		REG_LOCAL_IRQ_SAVE;
+		/* Remove analog reset and Power on the PLL */
+		pChipcHw->PLLConfig2 &=
+		    ~(chipcHw_REG_PLL_CONFIG_A_RESET |
+		      chipcHw_REG_PLL_CONFIG_POWER_DOWN);
+
+		REG_LOCAL_IRQ_RESTORE;
+
+	}
+
+	/* Wait until PLL is locked */
+	while (!(pChipcHw->PLLStatus2 & chipcHw_REG_PLL_STATUS_LOCKED))
+		;
+
+	{
+		REG_LOCAL_IRQ_SAVE;
+		/* Remove digital reset */
+		pChipcHw->PLLConfig2 &= ~chipcHw_REG_PLL_CONFIG_D_RESET;
+
+		REG_LOCAL_IRQ_RESTORE;
+	}
+}
+
+EXPORT_SYMBOL(chipcHw_pll2Enable);
+
+/****************************************************************************/
+/**
+*  @brief  Initializes the PLL1
+*
+*  This function initializes the PLL1
+*
+*/
+/****************************************************************************/
+void chipcHw_pll1Enable(uint32_t vcoFreqHz, chipcHw_SPREAD_SPECTRUM_e ssSupport)
+{
+	uint32_t pllPreDivider = 0;
+
+	{
+		REG_LOCAL_IRQ_SAVE;
+
+		pChipcHw->PLLConfig =
+		    chipcHw_REG_PLL_CONFIG_D_RESET |
+		    chipcHw_REG_PLL_CONFIG_A_RESET;
+		/* Setting VCO frequency */
+		if (ssSupport == chipcHw_SPREAD_SPECTRUM_ALLOW) {
+			pllPreDivider =
+			    chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_MASH_1_8 |
+			    ((chipcHw_REG_PLL_PREDIVIDER_NDIV_i(vcoFreqHz) -
+			      1) << chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT) |
+			    (chipcHw_REG_PLL_PREDIVIDER_P1 <<
+			     chipcHw_REG_PLL_PREDIVIDER_P1_SHIFT) |
+			    (chipcHw_REG_PLL_PREDIVIDER_P2 <<
+			     chipcHw_REG_PLL_PREDIVIDER_P2_SHIFT);
+		} else {
+			pllPreDivider = chipcHw_REG_PLL_PREDIVIDER_POWER_DOWN |
+			    chipcHw_REG_PLL_PREDIVIDER_NDIV_MODE_INTEGER |
+			    (chipcHw_REG_PLL_PREDIVIDER_NDIV_i(vcoFreqHz) <<
+			     chipcHw_REG_PLL_PREDIVIDER_NDIV_SHIFT) |
+			    (chipcHw_REG_PLL_PREDIVIDER_P1 <<
+			     chipcHw_REG_PLL_PREDIVIDER_P1_SHIFT) |
+			    (chipcHw_REG_PLL_PREDIVIDER_P2 <<
+			     chipcHw_REG_PLL_PREDIVIDER_P2_SHIFT);
+		}
+
+		/* Enable CHIPC registers to control the PLL */
+		pChipcHw->PLLStatus |= chipcHw_REG_PLL_STATUS_CONTROL_ENABLE;
+
+		/* Set pre divider to get desired VCO frequency */
+		pChipcHw->PLLPreDivider = pllPreDivider;
+		/* Set NDIV Frac */
+		if (ssSupport == chipcHw_SPREAD_SPECTRUM_ALLOW) {
+			pChipcHw->PLLDivider = chipcHw_REG_PLL_DIVIDER_M1DIV |
+			    chipcHw_REG_PLL_DIVIDER_NDIV_f_SS;
+		} else {
+			pChipcHw->PLLDivider = chipcHw_REG_PLL_DIVIDER_M1DIV |
+			    chipcHw_REG_PLL_DIVIDER_NDIV_f;
+		}
+
+		/* Reset PLL1 */
+		if (vcoFreqHz > chipcHw_REG_PLL_CONFIG_VCO_SPLIT_FREQ) {
+			pChipcHw->PLLConfig = chipcHw_REG_PLL_CONFIG_D_RESET |
+			    chipcHw_REG_PLL_CONFIG_A_RESET |
+			    chipcHw_REG_PLL_CONFIG_VCO_1601_3200 |
+			    chipcHw_REG_PLL_CONFIG_POWER_DOWN;
+		} else {
+			pChipcHw->PLLConfig = chipcHw_REG_PLL_CONFIG_D_RESET |
+			    chipcHw_REG_PLL_CONFIG_A_RESET |
+			    chipcHw_REG_PLL_CONFIG_VCO_800_1600 |
+			    chipcHw_REG_PLL_CONFIG_POWER_DOWN;
+		}
+
+		REG_LOCAL_IRQ_RESTORE;
+
+		/* Insert certain amount of delay before deasserting ARESET. */
+		udelay(1);
+
+		{
+			REG_LOCAL_IRQ_SAVE;
+			/* Remove analog reset and Power on the PLL */
+			pChipcHw->PLLConfig &=
+			    ~(chipcHw_REG_PLL_CONFIG_A_RESET |
+			      chipcHw_REG_PLL_CONFIG_POWER_DOWN);
+			REG_LOCAL_IRQ_RESTORE;
+		}
+
+		/* Wait until PLL is locked */
+		while (!(pChipcHw->PLLStatus & chipcHw_REG_PLL_STATUS_LOCKED)
+		       || !(pChipcHw->
+			    PLLStatus2 & chipcHw_REG_PLL_STATUS_LOCKED))
+			;
+
+		/* Remove digital reset */
+		{
+			REG_LOCAL_IRQ_SAVE;
+			pChipcHw->PLLConfig &= ~chipcHw_REG_PLL_CONFIG_D_RESET;
+			REG_LOCAL_IRQ_RESTORE;
+		}
+	}
+}
+
+EXPORT_SYMBOL(chipcHw_pll1Enable);
+
+/****************************************************************************/
+/**
+*  @brief  Initializes the chipc module
+*
+*  This function initializes the PLLs and core system clocks
+*
+*/
+/****************************************************************************/
+
+void chipcHw_Init(chipcHw_INIT_PARAM_t *initParam	/*  [ IN ] Misc chip initialization parameter */
+    ) {
+#if !(defined(__KERNEL__) && !defined(STANDALONE))
+	delay_init();
+#endif
+
+	/* Do not program PLL, when warm reset */
+	if (!(chipcHw_getStickyBits() & chipcHw_REG_STICKY_CHIP_WARM_RESET)) {
+		chipcHw_pll1Enable(initParam->pllVcoFreqHz,
+				   initParam->ssSupport);
+		chipcHw_pll2Enable(initParam->pll2VcoFreqHz);
+	} else {
+		/* Clear sticky bits */
+		chipcHw_clearStickyBits(chipcHw_REG_STICKY_CHIP_WARM_RESET);
+	}
+	/* Clear sticky bits */
+	chipcHw_clearStickyBits(chipcHw_REG_STICKY_CHIP_SOFT_RESET);
+
+	/* Before configuring the ARM clock, atleast we need to make sure BUS clock maintains the proper ratio with ARM clock */
+	pChipcHw->ACLKClock =
+	    (pChipcHw->
+	     ACLKClock & ~chipcHw_REG_ACLKClock_CLK_DIV_MASK) | (initParam->
+								 armBusRatio &
+								 chipcHw_REG_ACLKClock_CLK_DIV_MASK);
+
+	/* Set various core component frequencies. The order in which this is done is important for some. */
+	/* The RTBUS (DDR PHY) is derived from the BUS, and the BUS from the ARM, and VPM needs to know BUS */
+	/* frequency to find its ratio with the BUS.  Hence we must set the ARM first, followed by the BUS,  */
+	/* then VPM and RTBUS. */
+
+	chipcHw_setClockFrequency(chipcHw_CLOCK_ARM,
+				  initParam->busClockFreqHz *
+				  initParam->armBusRatio);
+	chipcHw_setClockFrequency(chipcHw_CLOCK_BUS, initParam->busClockFreqHz);
+	chipcHw_setClockFrequency(chipcHw_CLOCK_VPM,
+				  initParam->busClockFreqHz *
+				  initParam->vpmBusRatio);
+	chipcHw_setClockFrequency(chipcHw_CLOCK_DDR,
+				  initParam->busClockFreqHz *
+				  initParam->ddrBusRatio);
+	chipcHw_setClockFrequency(chipcHw_CLOCK_RTBUS,
+				  initParam->busClockFreqHz / 2);
+}

arch/arm/mach-bcmring/csp/chipc/chipcHw_reset.c

+/*****************************************************************************
+* Copyright 2003 - 2008 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+#include <csp/stdint.h>
+#include <mach/csp/chipcHw_def.h>
+#include <mach/csp/chipcHw_inline.h>
+#include <csp/intcHw.h>
+#include <csp/cache.h>
+
+/* ---- Private Constants and Types --------------------------------------- */
+/* ---- Private Variables ------------------------------------------------- */
+void chipcHw_reset_run_from_aram(void);
+
+typedef void (*RUNFUNC) (void);
+
+/****************************************************************************/
+/**
+*  @brief   warmReset
+*
+*  @note warmReset configures the clocks which are not reset back to the state
+*   required to execute on reset.  To do so we need to copy the code into internal
+*   memory to change the ARM clock while we are not executing from DDR.
+*/
+/****************************************************************************/
+void chipcHw_reset(uint32_t mask)
+{
+	int i = 0;
+	RUNFUNC runFunc = (RUNFUNC) (unsigned long)MM_ADDR_IO_ARAM;
+
+	/* Disable all interrupts */
+	intcHw_irq_disable(INTCHW_INTC0, 0xffffffff);
+	intcHw_irq_disable(INTCHW_INTC1, 0xffffffff);
+	intcHw_irq_disable(INTCHW_SINTC, 0xffffffff);
+
+	{
+		REG_LOCAL_IRQ_SAVE;
+		if (mask & chipcHw_REG_SOFT_RESET_CHIP_SOFT) {
+			chipcHw_softReset(chipcHw_REG_SOFT_RESET_CHIP_SOFT);
+		}
+		/* Bypass the PLL clocks before reboot */
+		pChipcHw->UARTClock |= chipcHw_REG_PLL_CLOCK_BYPASS_SELECT;
+		pChipcHw->SPIClock |= chipcHw_REG_PLL_CLOCK_BYPASS_SELECT;
+
+		/* Copy the chipcHw_warmReset_run_from_aram function into ARAM */
+		do {
+			((uint32_t *) MM_IO_BASE_ARAM)[i] =
+			    ((uint32_t *) &chipcHw_reset_run_from_aram)[i];
+			i++;
+		} while (((uint32_t *) MM_IO_BASE_ARAM)[i - 1] != 0xe1a0f00f);	/* 0xe1a0f00f == asm ("mov r15, r15"); */
+
+		CSP_CACHE_FLUSH_ALL;
+
+		/* run the function from ARAM */
+		runFunc();
+
+		/* Code will never get here, but include it to balance REG_LOCAL_IRQ_SAVE above */
+		REG_LOCAL_IRQ_RESTORE;
+	}
+}
+
+/* This function must run from internal memory */
+void chipcHw_reset_run_from_aram(void)
+{
+/* Make sure, pipeline is filled with instructions coming from ARAM */
+__asm (" nop                                                            \n\t"
+		" nop                                                            \n\t"
+#if defined(__KERNEL__) && !defined(STANDALONE)
+		" MRC      p15,#0x0,r0,c1,c0,#0                                  \n\t"
+		" BIC      r0,r0,#0xd                                            \n\t"
+		" MCR      p15,#0x0,r0,c1,c0,#0                                  \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+#endif
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+/* Bypass the ARM clock and switch to XTAL clock */
+		" MOV      r2,#0x80000000                                        \n\t"
+		" LDR      r3,[r2,#8]                                            \n\t"
+		" ORR      r3,r3,#0x20000                                        \n\t"
+		" STR      r3,[r2,#8]                                            \n\t"
+
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+		" nop                                                            \n\t"
+/* Issue reset */
+		" MOV      r3,#0x2                                               \n\t"
+		" STR      r3,[r2,#0x80]                                         \n\t"
+/* End here */
+		" MOV      pc,pc                                                 \n\t");
+/* 0xe1a0f00f ==  asm ("mov r15, r15"); */
+}

arch/arm/mach-bcmring/csp/chipc/chipcHw_str.c

+/*****************************************************************************
+* Copyright 2008 Broadcom Corporation.  All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+/****************************************************************************/
+/**
+*  @file    chipcHw_str.c
+*
+*  @brief   Contains strings which are useful to linux and csp
+*
+*  @note
+*/
+/****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+
+#include <mach/csp/chipcHw_inline.h>
+
+/* ---- Private Constants and Types --------------------------------------- */
+
+static const char *gMuxStr[] = {
+	"GPIO",			/* 0 */
+	"KeyPad",		/* 1 */
+	"I2C-Host",		/* 2 */
+	"SPI",			/* 3 */
+	"Uart",			/* 4 */
+	"LED-Mtx-P",		/* 5 */
+	"LED-Mtx-S",		/* 6 */
+	"SDIO-0",		/* 7 */
+	"SDIO-1",		/* 8 */
+	"PCM",			/* 9 */
+	"I2S",			/* 10 */
+	"ETM",			/* 11 */
+	"Debug",		/* 12 */
+	"Misc",			/* 13 */
+	"0xE",			/* 14 */
+	"0xF",			/* 15 */
+};
+
+/****************************************************************************/
+/**
+*  @brief   Retrieves a string representation of the mux setting for a pin.
+*
+*  @return  Pointer to a character string.
+*/
+/****************************************************************************/
+
+const char *chipcHw_getGpioPinFunctionStr(int pin)
+{
+	if ((pin < 0) || (pin >= chipcHw_GPIO_COUNT)) {
+		return "";
+	}
+
+	return gMuxStr[chipcHw_getGpioPinFunction(pin)];
+}