platform/msm8960/acpuclock.c

/*
 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of Code Aurora nor
 *     the names of its contributors may be used to endorse or promote
 *     products derived from this software without specific prior written
 *     permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <debug.h>
#include <reg.h>
#include <platform/iomap.h>

/* NS/MD value for USB XCVR */
#define MSM_BOOT_USB_XCVR_NS_VAL     0x00E400C3
#define MSM_BOOT_USB_XCVR_MD_VAL     0x000500DF


/* Set rate and enable the clock */
void clock_config(uint32_t ns,
				  uint32_t md,
				  uint32_t ns_addr,
				  uint32_t md_addr)
{
	unsigned int val = 0;

	/* Activate the reset for the M/N Counter */
	val = 1 << 7;
	writel(val, ns_addr);

	/* Write the MD value into the MD register */
	writel(md, md_addr);

	/* Write the ns value, and active reset for M/N Counter, again */
	val = 1 << 7;
	val |= ns;
	writel(val, ns_addr);

	/* De-activate the reset for M/N Counter */
	val = 1 << 7;
	val = ~val;
	val = val & readl(ns_addr);
	writel(val, ns_addr);

	/* Enable the Clock Root */
	val = 1 << 11;
	val = val | readl(ns_addr);
	writel(val, ns_addr);

	/* Enable the Clock Branch */
	val = 1 << 9;
	val = val | readl(ns_addr);
	writel(val, ns_addr);

	/* Enable the M/N Counter */
	val = 1 << 8;
	val = val | readl(ns_addr);
	writel(val, ns_addr);
}

void pll8_enable(void)
{
	/* Currently both UART and USB depend on this PLL8 clock initialization. */
	unsigned int curr_value = 0;

	/* Vote for PLL8 to be enabled */
	curr_value = readl(MSM_BOOT_PLL_ENABLE_SC0);
	curr_value |= (1 << 8);
	writel(curr_value, MSM_BOOT_PLL_ENABLE_SC0);

	/* Proceed only after PLL is enabled */
	while (!(readl(MSM_BOOT_PLL8_STATUS) & (1<<16)));
}

void hsusb_clock_init(void)
{
	unsigned int val = 0;

	/* TODO: Enable pll8 here */
	/* Setup USB AHB clock */

	val = readl(USB_HS1_HCLK_CTL);
	/* branch enable */
	val |= (1 << 4);
	writel(val, USB_HS1_HCLK_CTL);

	/* Setup XCVR clock */
	clock_config(MSM_BOOT_USB_XCVR_NS_VAL,
				 MSM_BOOT_USB_XCVR_MD_VAL,
				 USB_HS1_XCVR_FS_CLK_NS,
				 USB_HS1_XCVR_FS_CLK_MD);
}