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/*
* clock_am33xx.c
*
* clocks for AM33XX based boards
*
* Copyright (C) 2013, Texas Instruments, Incorporated - http://www.ti.com/
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/cpu.h>
#include <asm/arch/clock.h>
#include <asm/arch/hardware.h>
#include <asm/io.h>
#define OSC (V_OSCK/1000000)
struct cm_perpll *const cmper = (struct cm_perpll *)CM_PER;
struct cm_wkuppll *const cmwkup = (struct cm_wkuppll *)CM_WKUP;
struct cm_dpll *const cmdpll = (struct cm_dpll *)CM_DPLL;
struct cm_rtc *const cmrtc = (struct cm_rtc *)CM_RTC;
const struct dpll_regs dpll_mpu_regs = {
.cm_clkmode_dpll = CM_WKUP + 0x88,
.cm_idlest_dpll = CM_WKUP + 0x20,
.cm_clksel_dpll = CM_WKUP + 0x2C,
.cm_div_m2_dpll = CM_WKUP + 0xA8,
};
const struct dpll_regs dpll_core_regs = {
.cm_clkmode_dpll = CM_WKUP + 0x90,
.cm_idlest_dpll = CM_WKUP + 0x5C,
.cm_clksel_dpll = CM_WKUP + 0x68,
.cm_div_m4_dpll = CM_WKUP + 0x80,
.cm_div_m5_dpll = CM_WKUP + 0x84,
.cm_div_m6_dpll = CM_WKUP + 0xD8,
};
const struct dpll_regs dpll_per_regs = {
.cm_clkmode_dpll = CM_WKUP + 0x8C,
.cm_idlest_dpll = CM_WKUP + 0x70,
.cm_clksel_dpll = CM_WKUP + 0x9C,
.cm_div_m2_dpll = CM_WKUP + 0xAC,
};
const struct dpll_regs dpll_ddr_regs = {
.cm_clkmode_dpll = CM_WKUP + 0x94,
.cm_idlest_dpll = CM_WKUP + 0x34,
.cm_clksel_dpll = CM_WKUP + 0x40,
.cm_div_m2_dpll = CM_WKUP + 0xA0,
};
struct dpll_params dpll_mpu_opp100 = {
CONFIG_SYS_MPUCLK, OSC-1, 1, -1, -1, -1, -1};
const struct dpll_params dpll_core_opp100 = {
1000, OSC-1, -1, -1, 10, 8, 4};
const struct dpll_params dpll_mpu = {
MPUPLL_M_300, OSC-1, 1, -1, -1, -1, -1};
const struct dpll_params dpll_core = {
50, OSC-1, -1, -1, 1, 1, 1};
const struct dpll_params dpll_per = {
960, OSC-1, 5, -1, -1, -1, -1};
const struct dpll_params *get_dpll_mpu_params(void)
{
return &dpll_mpu;
}
const struct dpll_params *get_dpll_core_params(void)
{
return &dpll_core;
}
const struct dpll_params *get_dpll_per_params(void)
{
return &dpll_per;
}
void setup_clocks_for_console(void)
{
clrsetbits_le32(&cmwkup->wkclkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
CD_CLKCTRL_CLKTRCTRL_SW_WKUP <<
CD_CLKCTRL_CLKTRCTRL_SHIFT);
clrsetbits_le32(&cmper->l4hsclkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
CD_CLKCTRL_CLKTRCTRL_SW_WKUP <<
CD_CLKCTRL_CLKTRCTRL_SHIFT);
clrsetbits_le32(&cmwkup->wkup_uart0ctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
clrsetbits_le32(&cmper->uart1clkctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
clrsetbits_le32(&cmper->uart2clkctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
clrsetbits_le32(&cmper->uart3clkctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
clrsetbits_le32(&cmper->uart4clkctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
clrsetbits_le32(&cmper->uart5clkctrl,
MODULE_CLKCTRL_MODULEMODE_MASK,
MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
MODULE_CLKCTRL_MODULEMODE_SHIFT);
}
void enable_basic_clocks(void)
{
u32 *const clk_domains[] = {
&cmper->l3clkstctrl,
&cmper->l4fwclkstctrl,
&cmper->l3sclkstctrl,
&cmper->l4lsclkstctrl,
&cmwkup->wkclkstctrl,
&cmper->emiffwclkctrl,
&cmrtc->clkstctrl,
0
};
u32 *const clk_modules_explicit_en[] = {
&cmper->l3clkctrl,
&cmper->l4lsclkctrl,
&cmper->l4fwclkctrl,
&cmwkup->wkl4wkclkctrl,
&cmper->l3instrclkctrl,
&cmper->l4hsclkctrl,
&cmwkup->wkgpio0clkctrl,
&cmwkup->wkctrlclkctrl,
&cmper->timer2clkctrl,
&cmper->gpmcclkctrl,
&cmper->elmclkctrl,
&cmper->mmc0clkctrl,
&cmper->mmc1clkctrl,
&cmwkup->wkup_i2c0ctrl,
&cmper->gpio1clkctrl,
&cmper->gpio2clkctrl,
&cmper->gpio3clkctrl,
&cmper->i2c1clkctrl,
&cmper->cpgmac0clkctrl,
&cmper->spi0clkctrl,
&cmrtc->rtcclkctrl,
&cmper->usb0clkctrl,
&cmper->emiffwclkctrl,
&cmper->emifclkctrl,
0
};
do_enable_clocks(clk_domains, clk_modules_explicit_en, 1);
/* Select the Master osc 24 MHZ as Timer2 clock source */
writel(0x1, &cmdpll->clktimer2clk);
}
/*
* Enable Spread Spectrum for the MPU by calculating the required
* values and setting the registers accordingly.
* @param permille The spreading in permille (10th of a percent)
*/
void set_mpu_spreadspectrum(int permille)
{
u32 multiplier_m;
u32 predivider_n;
u32 cm_clksel_dpll_mpu;
u32 cm_clkmode_dpll_mpu;
u32 ref_clock;
u32 pll_bandwidth;
u32 mod_freq_divider;
u32 exponent;
u32 mantissa;
u32 delta_m_step;
printf("Enabling Spread Spectrum of %d permille for MPU\n",
permille);
/* Read PLL parameter m and n */
cm_clksel_dpll_mpu = readl(&cmwkup->clkseldpllmpu);
multiplier_m = (cm_clksel_dpll_mpu >> 8) & 0x3FF;
predivider_n = cm_clksel_dpll_mpu & 0x7F;
/*
* Calculate reference clock (clock after pre-divider),
* its max. PLL bandwidth,
* and resulting mod_freq_divider
*/
ref_clock = V_OSCK / (predivider_n + 1);
pll_bandwidth = ref_clock / 70;
mod_freq_divider = ref_clock / (4 * pll_bandwidth);
/* Calculate Mantissa/Exponent */
exponent = 0;
mantissa = mod_freq_divider;
while ((mantissa > 127) && (exponent < 7)) {
exponent++;
mantissa /= 2;
}
if (mantissa > 127)
mantissa = 127;
mod_freq_divider = mantissa << exponent;
/*
* Calculate Modulation steps
* As we use Downspread only, the spread is twice the value of
* permille, so Div2!
* As it takes the value in percent, divide by ten!
*/
delta_m_step = ((u32)((multiplier_m * permille) / 10 / 2)) << 18;
delta_m_step /= 100;
delta_m_step /= mod_freq_divider;
if (delta_m_step > 0xFFFFF)
delta_m_step = 0xFFFFF;
/* Setup Spread Spectrum */
writel(delta_m_step, &cmwkup->sscdeltamstepdllmpu);
writel((exponent << 8) | mantissa, &cmwkup->sscmodfreqdivdpllmpu);
cm_clkmode_dpll_mpu = readl(&cmwkup->clkmoddpllmpu);
/* clear all SSC flags */
cm_clkmode_dpll_mpu &= ~(0xF << CM_CLKMODE_DPLL_SSC_EN_SHIFT);
/* enable SSC with Downspread only */
cm_clkmode_dpll_mpu |= CM_CLKMODE_DPLL_SSC_EN_MASK |
CM_CLKMODE_DPLL_SSC_DOWNSPREAD_MASK;
writel(cm_clkmode_dpll_mpu, &cmwkup->clkmoddpllmpu);
while (!(readl(&cmwkup->clkmoddpllmpu) & 0x2000))
;
}
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