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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <intelblocks/lpss.h>
/* Clock register */
#define LPSS_CLOCK_CTL_REG 0x200
#define LPSS_CNT_CLOCK_EN 1
#define LPSS_CNT_CLK_UPDATE (1 << 31)
#define LPSS_CLOCK_DIV_N(n) (((n) & 0x7fff) << 16)
#define LPSS_CLOCK_DIV_M(m) (((m) & 0x7fff) << 1)
/* reset register */
#define LPSS_RESET_CTL_REG 0x204
/*
* Bit 1:0 controls LPSS controller reset.
*
* 00 ->LPSS Host Controller is in reset (Reset Asserted)
* 01/10 ->Reserved
* 11 ->LPSS Host Controller is NOT at reset (Reset Released)
*/
#define LPSS_CNT_RST_RELEASE 3
/* DMA Software Reset Control */
#define LPSS_DMA_RST_RELEASE (1 << 2)
bool lpss_is_controller_in_reset(uintptr_t base)
{
uint8_t *addr = (void *)base;
uint32_t val = read32(addr + LPSS_RESET_CTL_REG);
if (val == 0xFFFFFFFF)
return true;
return !(val & LPSS_CNT_RST_RELEASE);
}
void lpss_reset_release(uintptr_t base)
{
uint8_t *addr = (void *)base;
/* Take controller out of reset */
write32(addr + LPSS_RESET_CTL_REG, LPSS_CNT_RST_RELEASE);
}
void lpss_clk_update(uintptr_t base, uint32_t clk_m_val, uint32_t clk_n_val)
{
uint8_t *addr = (void *)base;
uint32_t clk_sel;
addr += LPSS_CLOCK_CTL_REG;
clk_sel = LPSS_CLOCK_DIV_N(clk_n_val) | LPSS_CLOCK_DIV_M(clk_m_val);
clk_sel |= LPSS_CNT_CLK_UPDATE | LPSS_CNT_CLOCK_EN;
write32(addr, clk_sel);
}
uint32_t lpss_clk_read(uintptr_t base)
{
uint8_t *addr = (void *)base;
addr += LPSS_CLOCK_CTL_REG;
return read32(addr);
}
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