platform/msm7k/acpuclock.c

/*
 * Copyright (c) 2008, Google Inc.
 * All rights reserved.
 * Copyright (c) 2009, 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.
 *
 * 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 AND FITNESS
 * FOR A PARTICULAR PURPOSE 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>

#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 PLL1		1
#define PLL2		2
#define SRC_SEL_PLL1	1 /* PLL1. */
#define SRC_SEL_PLL2	2 /* PLL2. */
#define DIV_4		3
#define DIV_2		1
#define WAIT_CNT	100
#define VDD_LEVEL	7
#define MIN_AXI_HZ	120000000

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[] = {
	(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 << 12) | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 4)  | DIV_2,
	(WAIT_CNT << 16) | (SRC_SEL_PLL2 << 12) | (DIV_2 << 8),
};

/* 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,
};

void mdelay(unsigned msecs);


void acpu_clock_init(void)
{
	unsigned i;

#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;

	/* Jump into table and set every other entry. */
	for(; i < ARRAY_SIZE(clk_cntl_reg_val); i += 2) {
		writel(clk_cntl_reg_val[i], A11S_CLK_CNTL_ADDR);
		/* 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
	}
}