coreboot-kgpe-d16/src/soc/qualcomm/ipq806x/gsbi.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2014 - 2015 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <arch/io.h>
#include <soc/iomap.h>
#include <soc/gsbi.h>
#include <console/console.h>

static inline void *gsbi_ctl_reg_addr(gsbi_id_t gsbi_id)
{
	switch (gsbi_id) {
	case GSBI_ID_1:
		return GSBI1_CTL_REG;
	case GSBI_ID_2:
		return GSBI2_CTL_REG;
	case GSBI_ID_3:
		return GSBI3_CTL_REG;
	case GSBI_ID_4:
		return GSBI4_CTL_REG;
	case GSBI_ID_5:
		return GSBI5_CTL_REG;
	case GSBI_ID_6:
		return GSBI6_CTL_REG;
	case GSBI_ID_7:
		return GSBI7_CTL_REG;
	default:
		printk(BIOS_ERR, "Unsupported GSBI%d\n", gsbi_id);
		return 0;
	}
}

gsbi_return_t gsbi_init(gsbi_id_t gsbi_id, gsbi_protocol_t protocol)
{
	unsigned reg_val;
	unsigned m = 1;
	unsigned n = 4;
	unsigned pre_div = 4;
	unsigned src = 3;
	unsigned mnctr_mode = 2;
	void *gsbi_ctl = gsbi_ctl_reg_addr(gsbi_id);

	if (!gsbi_ctl)
		return GSBI_ID_ERROR;

	writel((1 << GSBI_HCLK_CTL_GATE_ENA) | (1 << GSBI_HCLK_CTL_BRANCH_ENA),
		GSBI_HCLK_CTL(gsbi_id));

	if (gsbi_init_board(gsbi_id))
		return GSBI_UNSUPPORTED;

	writel(0, GSBI_QUP_APSS_NS_REG(gsbi_id));
	writel(0, GSBI_QUP_APSS_MD_REG(gsbi_id));

	reg_val = ((m & GSBI_QUP_APPS_M_MASK) << GSBI_QUP_APPS_M_SHFT) |
		  ((~n & GSBI_QUP_APPS_D_MASK) << GSBI_QUP_APPS_D_SHFT);
	writel(reg_val, GSBI_QUP_APSS_MD_REG(gsbi_id));

	reg_val = (((~(n - m)) & GSBI_QUP_APPS_N_MASK) <<
					GSBI_QUP_APPS_N_SHFT) |
		  ((mnctr_mode & GSBI_QUP_APPS_MNCTR_MODE_MSK) <<
				 GSBI_QUP_APPS_MNCTR_MODE_SFT) |
		  (((pre_div - 1) & GSBI_QUP_APPS_PRE_DIV_MSK) <<
				 GSBI_QUP_APPS_PRE_DIV_SFT) |
		  (src & GSBI_QUP_APPS_SRC_SEL_MSK);
	writel(reg_val, GSBI_QUP_APSS_NS_REG(gsbi_id));

	reg_val |= (1 << GSBI_QUP_APPS_ROOT_ENA_SFT) |
		   (1 << GSBI_QUP_APPS_MNCTR_EN_SFT);
	writel(reg_val, GSBI_QUP_APSS_NS_REG(gsbi_id));

	reg_val |= (1 << GSBI_QUP_APPS_BRANCH_ENA_SFT);
	writel(reg_val, GSBI_QUP_APSS_NS_REG(gsbi_id));

	/*Select i2c protocol*/
	writel(((GSBI_CTL_PROTO_I2C & GSBI_CTL_PROTO_CODE_MSK) <<
					GSBI_CTL_PROTO_CODE_SFT), gsbi_ctl);

	return GSBI_SUCCESS;
}