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/*
* Copyright 2014 Broadcom Corporation.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/iproc-common/armpll.h>
#include <asm/iproc-common/sysmap.h>
#define NELEMS(x) (sizeof(x) / sizeof(x[0]))
struct armpll_parameters {
unsigned int mode;
unsigned int ndiv_int;
unsigned int ndiv_frac;
unsigned int pdiv;
unsigned int freqid;
};
struct armpll_parameters armpll_clk_tab[] = {
{ 25, 64, 1, 1, 0},
{ 100, 64, 1, 1, 2},
{ 400, 64, 1, 1, 6},
{ 448, 71, 713050, 1, 6},
{ 500, 80, 1, 1, 6},
{ 560, 89, 629145, 1, 6},
{ 600, 96, 1, 1, 6},
{ 800, 64, 1, 1, 7},
{ 896, 71, 713050, 1, 7},
{ 1000, 80, 1, 1, 7},
{ 1100, 88, 1, 1, 7},
{ 1120, 89, 629145, 1, 7},
{ 1200, 96, 1, 1, 7},
};
uint32_t armpll_config(uint32_t clkmhz)
{
uint32_t freqid;
uint32_t ndiv_frac;
uint32_t pll;
uint32_t status = 1;
uint32_t timeout_countdown;
int i;
for (i = 0; i < NELEMS(armpll_clk_tab); i++) {
if (armpll_clk_tab[i].mode == clkmhz) {
status = 0;
break;
}
}
if (status) {
printf("Error: Clock configuration not supported\n");
goto armpll_config_done;
}
/* Enable write access */
writel(IPROC_REG_WRITE_ACCESS, IHOST_PROC_CLK_WR_ACCESS);
if (clkmhz == 25)
freqid = 0;
else
freqid = 2;
/* Bypass ARM clock and run on sysclk */
writel(1 << IHOST_PROC_CLK_POLICY_FREQ__PRIV_ACCESS_MODE |
freqid << IHOST_PROC_CLK_POLICY_FREQ__POLICY3_FREQ_R |
freqid << IHOST_PROC_CLK_POLICY_FREQ__POLICY2_FREQ_R |
freqid << IHOST_PROC_CLK_POLICY_FREQ__POLICY1_FREQ_R |
freqid << IHOST_PROC_CLK_POLICY_FREQ__POLICY0_FREQ_R,
IHOST_PROC_CLK_POLICY_FREQ);
writel(1 << IHOST_PROC_CLK_POLICY_CTL__GO |
1 << IHOST_PROC_CLK_POLICY_CTL__GO_AC,
IHOST_PROC_CLK_POLICY_CTL);
/* Poll CCU until operation complete */
timeout_countdown = 0x100000;
while (readl(IHOST_PROC_CLK_POLICY_CTL) &
(1 << IHOST_PROC_CLK_POLICY_CTL__GO)) {
timeout_countdown--;
if (timeout_countdown == 0) {
printf("CCU polling timedout\n");
status = 1;
goto armpll_config_done;
}
}
if (clkmhz == 25 || clkmhz == 100) {
status = 0;
goto armpll_config_done;
}
/* Now it is safe to program the PLL */
pll = readl(IHOST_PROC_CLK_PLLARMB);
pll &= ~((1 << IHOST_PROC_CLK_PLLARMB__PLLARM_NDIV_FRAC_WIDTH) - 1);
ndiv_frac =
((1 << IHOST_PROC_CLK_PLLARMB__PLLARM_NDIV_FRAC_WIDTH) - 1) &
(armpll_clk_tab[i].ndiv_frac <<
IHOST_PROC_CLK_PLLARMB__PLLARM_NDIV_FRAC_R);
pll |= ndiv_frac;
writel(pll, IHOST_PROC_CLK_PLLARMB);
writel(1 << IHOST_PROC_CLK_PLLARMA__PLLARM_LOCK |
armpll_clk_tab[i].ndiv_int <<
IHOST_PROC_CLK_PLLARMA__PLLARM_NDIV_INT_R |
armpll_clk_tab[i].pdiv <<
IHOST_PROC_CLK_PLLARMA__PLLARM_PDIV_R |
1 << IHOST_PROC_CLK_PLLARMA__PLLARM_SOFT_RESETB,
IHOST_PROC_CLK_PLLARMA);
/* Poll ARM PLL Lock until operation complete */
timeout_countdown = 0x100000;
while (readl(IHOST_PROC_CLK_PLLARMA) &
(1 << IHOST_PROC_CLK_PLLARMA__PLLARM_LOCK)) {
timeout_countdown--;
if (timeout_countdown == 0) {
printf("ARM PLL lock failed\n");
status = 1;
goto armpll_config_done;
}
}
pll = readl(IHOST_PROC_CLK_PLLARMA);
pll |= (1 << IHOST_PROC_CLK_PLLARMA__PLLARM_SOFT_POST_RESETB);
writel(pll, IHOST_PROC_CLK_PLLARMA);
/* Set the policy */
writel(1 << IHOST_PROC_CLK_POLICY_FREQ__PRIV_ACCESS_MODE |
armpll_clk_tab[i].freqid <<
IHOST_PROC_CLK_POLICY_FREQ__POLICY3_FREQ_R |
armpll_clk_tab[i].freqid <<
IHOST_PROC_CLK_POLICY_FREQ__POLICY2_FREQ_R |
armpll_clk_tab[i].freqid <<
IHOST_PROC_CLK_POLICY_FREQ__POLICY1_FREQ_R |
armpll_clk_tab[i+4].freqid <<
IHOST_PROC_CLK_POLICY_FREQ__POLICY0_FREQ_R,
IHOST_PROC_CLK_POLICY_FREQ);
writel(IPROC_CLKCT_HDELAY_SW_EN, IHOST_PROC_CLK_CORE0_CLKGATE);
writel(IPROC_CLKCT_HDELAY_SW_EN, IHOST_PROC_CLK_CORE1_CLKGATE);
writel(IPROC_CLKCT_HDELAY_SW_EN, IHOST_PROC_CLK_ARM_SWITCH_CLKGATE);
writel(IPROC_CLKCT_HDELAY_SW_EN, IHOST_PROC_CLK_ARM_PERIPH_CLKGATE);
writel(IPROC_CLKCT_HDELAY_SW_EN, IHOST_PROC_CLK_APB0_CLKGATE);
writel(1 << IHOST_PROC_CLK_POLICY_CTL__GO |
1 << IHOST_PROC_CLK_POLICY_CTL__GO_AC,
IHOST_PROC_CLK_POLICY_CTL);
/* Poll CCU until operation complete */
timeout_countdown = 0x100000;
while (readl(IHOST_PROC_CLK_POLICY_CTL) &
(1 << IHOST_PROC_CLK_POLICY_CTL__GO)) {
timeout_countdown--;
if (timeout_countdown == 0) {
printf("CCU polling failed\n");
status = 1;
goto armpll_config_done;
}
}
status = 0;
armpll_config_done:
/* Disable access to PLL registers */
writel(0, IHOST_PROC_CLK_WR_ACCESS);
return status;
}
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