platform/msm7k/acpuclock.c

/*
 * Copyright (c) 2008, Google Inc.
 * All rights reserved.
 * Copyright (c) 2009-2012, The Linux Foundation. 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 The Linux Foundation 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 "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 <stdint.h>
#include <kernel/thread.h>
#include <platform/iomap.h>
#include <reg.h>
#include <debug.h>
#include <mmc.h>

#define ARRAY_SIZE(x) (sizeof(x)/sizeof((x)[0]))

#define A11S_CLK_CNTL_ADDR	(MSM_CSR_BASE + 0x100)
#define A11S_CLK_SEL_ADDR	(MSM_CSR_BASE + 0x104)
#define VDD_SVS_PLEVEL_ADDR	(MSM_CSR_BASE + 0x124)
#define PLL2_L_VAL_ADDR		(MSM_CLK_CTL_BASE + 0x33C)

#define SRC_SEL_PLL1	1 /* PLL1. */
#define SRC_SEL_PLL2	2 /* PLL2. */
#define SRC_SEL_PLL3	3 /* PLL3. Used for 7x25. */
#define DIV_4		3
#define DIV_2		1
#define WAIT_CNT	100
#define VDD_LEVEL	7
#define MIN_AXI_HZ	120000000
#define ACPU_800MHZ	41

void pll_request(unsigned pll, unsigned enable);
void axi_clock_init(unsigned rate);

/* The stepping frequencies have been choosen to make sure the step
 * is <= 256 MHz for both turbo mode and normal mode targets.  The
 * table also assumes the ACPU is running at TCXO freq and AHB div is
 * set to DIV_1.
 *
 * To use the tables:
 * - Start at location 0/1 depending on clock source sel bit.
 * - Set values till end of table skipping every other entry.
 * - When you reach the end of the table, you are done scaling.
 *
 * TODO: Need to fix SRC_SEL_PLL1 for 7x25.
 */

uint32_t const clk_cntl_reg_val_7625[] = {
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4)  | DIV_4,
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_4 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_2 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4) | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL3 << 4)  | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL3 << 12) | (DIV_2 << 8),
};

uint32_t const clk_cntl_reg_val_7627[] = {
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4)  | DIV_4,
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_4 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_2 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4) | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 4)  | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 12) | (DIV_2 << 8),
};

uint32_t const clk_cntl_reg_val_7627T[] = {
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4)  | DIV_4,
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_4 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 12) | (DIV_2 << 8),
	(WAIT_CNT << 16) | (SRC_SEL_PLL1 << 4) | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 4),
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 12),
};

/* Using DIV_4 for all cases to avoid worrying about turbo vs. normal
 * mode. Able to use DIV_4 for all steps because it's the largest AND
 * the final value. */
uint32_t const clk_sel_reg_val[] = {
	DIV_4 << 1 | 1,
	DIV_4 << 1 | 0,
	DIV_4 << 1 | 0,
	DIV_4 << 1 | 1,
	DIV_4 << 1 | 1,
	DIV_4 << 1 | 0,
};

/* enum for SDC CLK IDs */
enum
{
	SDC1_CLK  = 19,
	SDC1_PCLK = 20,
	SDC2_CLK  = 21,
	SDC2_PCLK = 22,
	SDC3_CLK  = 23,
	SDC3_PCLK = 24,
	SDC4_CLK  = 25,
	SDC4_PCLK = 26
};

/* Zero'th entry is dummy */
static uint8_t sdc_clk[]  = {0, SDC1_CLK,  SDC2_CLK,  SDC3_CLK,  SDC4_CLK};
static uint8_t sdc_pclk[] = {0, SDC1_PCLK, SDC2_PCLK, SDC3_PCLK, SDC4_PCLK};

void mdelay(unsigned msecs);


void acpu_clock_init(void)
{
	unsigned i,clk;

#if (!ENABLE_NANDWRITE)
        int *modem_stat_check = (MSM_SHARED_BASE + 0x14);

        /* Wait for modem to be ready before clock init */
        while (readl(modem_stat_check) != 1);
#endif

	/* Increase VDD level to the final value. */
	writel((1 << 7) | (VDD_LEVEL << 3), VDD_SVS_PLEVEL_ADDR);
#if (!ENABLE_NANDWRITE)
	thread_sleep(1);
#else
        mdelay(1);
#endif

	/* Read clock source select bit. */
	i = readl(A11S_CLK_SEL_ADDR) & 1;
	clk = readl(PLL2_L_VAL_ADDR) & 0x3F;

	/* Jump into table and set every other entry. */
	for(; i < ARRAY_SIZE(clk_cntl_reg_val_7627); i += 2) {
#ifdef ENABLE_PLL3
		writel(clk_cntl_reg_val_7625[i], A11S_CLK_CNTL_ADDR);
#else
		if(clk == ACPU_800MHZ)
			writel(clk_cntl_reg_val_7627T[i], A11S_CLK_CNTL_ADDR);
		else
			writel(clk_cntl_reg_val_7627[i], A11S_CLK_CNTL_ADDR);
#endif
		/* Would need a dmb() here but the whole address space is
		 * strongly ordered, so it should be fine.
		 */
		writel(clk_sel_reg_val[i], A11S_CLK_SEL_ADDR);
#if (!ENABLE_NANDWRITE)
		thread_sleep(1);
#else
                mdelay(1);
#endif
	}
}

/* Configure MMC clock */
void clock_config_mmc(uint32_t interface, uint32_t freq)
{
	uint32_t reg = 0;

	if( mmc_clock_set_rate(sdc_clk[interface], freq) < 0 )
	{
		dprintf(CRITICAL, "Failure setting clock rate for MCLK - "
						  "clk_rate: %d\n!", freq);
		ASSERT(0);
	}

	/* enable clock */
	if( mmc_clock_enable_disable(sdc_clk[interface], MMC_CLK_ENABLE) < 0 )
	{
		dprintf(CRITICAL, "Failure enabling MMC Clock!\n");
		ASSERT(0);
	}

	reg |= MMC_BOOT_MCI_CLK_ENABLE;
	reg |= MMC_BOOT_MCI_CLK_ENA_FLOW;
	reg |= MMC_BOOT_MCI_CLK_IN_FEEDBACK;
	writel( reg, MMC_BOOT_MCI_CLK );

	/* Wait for the MMC_BOOT_MCI_CLK write to go through. */
	mmc_mclk_reg_wr_delay();

	/* Wait 1 ms to provide the free running SD CLK to the card. */
	mdelay(1);
}

/* Intialize MMC clock */
void clock_init_mmc(uint32_t interface)
{
	if( mmc_clock_enable_disable(sdc_pclk[interface], MMC_CLK_ENABLE) < 0 )
	{
		dprintf(CRITICAL, "Failure enabling PCLK!\n");
		ASSERT(0);
	}
}