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/*
* This file is part of the coreboot project.
*
* Copyright (c) 2012 - 2013 The Linux Foundation. All rights reserved.
*
* 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 <device/mmio.h>
#include <delay.h>
#include <soc/clock.h>
#include <types.h>
/**
* uart_pll_vote_clk_enable - enables PLL8
*/
void uart_pll_vote_clk_enable(unsigned int clk_dummy)
{
setbits32(BB_PLL_ENA_SC0_REG, BIT(8));
if (!clk_dummy)
while ((read32(PLL_LOCK_DET_STATUS_REG) & BIT(8)) == 0);
}
/**
* uart_set_rate_mnd - configures divider M and D values
*
* Sets the M, D parameters of the divider to generate the GSBI UART
* apps clock.
*/
static void uart_set_rate_mnd(unsigned int gsbi_port, unsigned int m,
unsigned int n)
{
/* Assert MND reset. */
setbits32(GSBIn_UART_APPS_NS_REG(gsbi_port), BIT(7));
/* Program M and D values. */
write32(GSBIn_UART_APPS_MD_REG(gsbi_port), MD16(m, n));
/* Deassert MND reset. */
clrbits32(GSBIn_UART_APPS_NS_REG(gsbi_port), BIT(7));
}
/**
* uart_branch_clk_enable_reg - enables branch clock
*
* Enables branch clock for GSBI UART port.
*/
static void uart_branch_clk_enable_reg(unsigned int gsbi_port)
{
setbits32(GSBIn_UART_APPS_NS_REG(gsbi_port), BIT(9));
}
/**
* uart_local_clock_enable - configures N value and enables root clocks
*
* Sets the N parameter of the divider and enables root clock and
* branch clocks for GSBI UART port.
*/
static void uart_local_clock_enable(unsigned int gsbi_port, unsigned int n,
unsigned int m)
{
unsigned int reg_val, uart_ns_val;
void *const reg = (void *)GSBIn_UART_APPS_NS_REG(gsbi_port);
/*
* Program the NS register, if applicable. NS registers are not
* set in the set_rate path because power can be saved by deferring
* the selection of a clocked source until the clock is enabled.
*/
reg_val = read32(reg); // REG(0x29D4+(0x20*((n)-1)))
reg_val &= ~(Uart_clk_ns_mask);
uart_ns_val = NS(BIT_POS_31,BIT_POS_16,n,m, 5, 4, 3, 1, 2, 0,3);
reg_val |= (uart_ns_val & Uart_clk_ns_mask);
write32(reg, reg_val);
/* enable MNCNTR_EN */
reg_val = read32(reg);
reg_val |= BIT(8);
write32(reg, reg_val);
/* set source to PLL8 running @384MHz */
reg_val = read32(reg);
reg_val |= 0x3;
write32(reg, reg_val);
/* Enable root. */
reg_val |= Uart_en_mask;
write32(reg, reg_val);
uart_branch_clk_enable_reg(gsbi_port);
}
/**
* uart_set_gsbi_clk - enables HCLK for UART GSBI port
*/
static void uart_set_gsbi_clk(unsigned int gsbi_port)
{
setbits32(GSBIn_HCLK_CTL_REG(gsbi_port), BIT(4));
}
/**
* uart_clock_config - configures UART clocks
*
* Configures GSBI UART dividers, enable root and branch clocks.
*/
void uart_clock_config(unsigned int gsbi_port, unsigned int m,
unsigned int n, unsigned int d, unsigned int clk_dummy)
{
uart_set_rate_mnd(gsbi_port, m, d);
uart_pll_vote_clk_enable(clk_dummy);
uart_local_clock_enable(gsbi_port, n, m);
uart_set_gsbi_clk(gsbi_port);
}
/**
* nand_clock_config - configure NAND controller clocks
*
* Enable clocks to EBI2. Must be invoked before touching EBI2
* registers.
*/
void nand_clock_config(void)
{
write32(EBI2_CLK_CTL_REG,
CLK_BRANCH_ENA(1) | ALWAYS_ON_CLK_BRANCH_ENA(1));
/* Wait for clock to stabilize. */
udelay(10);
}
/**
* usb_clock_config - configure USB controller clocks and reset the controller
*/
void usb_clock_config(void)
{
/* Magic clock initialization numbers, nobody knows how they work... */
write32(USB30_MASTER_CLK_CTL_REG, 0x10);
write32(USB30_1_MASTER_CLK_CTL_REG, 0x10);
write32(USB30_MASTER_CLK_MD, 0x500DF);
write32(USB30_MASTER_CLK_NS, 0xE40942);
write32(USB30_MOC_UTMI_CLK_MD, 0x100D7);
write32(USB30_MOC_UTMI_CLK_NS, 0xD80942);
write32(USB30_MOC_UTMI_CLK_CTL, 0x10);
write32(USB30_1_MOC_UTMI_CLK_CTL, 0x10);
write32(USB30_RESET,
1 << 5 | /* assert port2 HS PHY async reset */
1 << 4 | /* assert master async reset */
1 << 3 | /* assert sleep async reset */
1 << 2 | /* assert MOC UTMI async reset */
1 << 1 | /* assert power-on async reset */
1 << 0); /* assert PHY async reset */
udelay(5);
write32(USB30_RESET, 0); /* deassert all USB resets again */
}
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