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/*
* Keystone2: pll initialization
*
* (C) Copyright 2012-2014
* Texas Instruments Incorporated, <www.ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/arch/clock_defs.h>
static void wait_for_completion(const struct pll_init_data *data)
{
int i;
for (i = 0; i < 100; i++) {
sdelay(450);
if ((pllctl_reg_read(data->pll, stat) & PLLSTAT_GO) == 0)
break;
}
}
void init_pll(const struct pll_init_data *data)
{
u32 tmp, tmp_ctl, pllm, plld, pllod, bwadj;
pllm = data->pll_m - 1;
plld = (data->pll_d - 1) & PLL_DIV_MASK;
pllod = (data->pll_od - 1) & PLL_CLKOD_MASK;
if (data->pll == MAIN_PLL) {
/* The requered delay before main PLL configuration */
sdelay(210000);
tmp = pllctl_reg_read(data->pll, secctl);
if (tmp & (PLLCTL_BYPASS)) {
setbits_le32(keystone_pll_regs[data->pll].reg1,
BIT(MAIN_ENSAT_OFFSET));
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN |
PLLCTL_PLLENSRC);
sdelay(340);
pllctl_reg_setbits(data->pll, secctl, PLLCTL_BYPASS);
pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLPWRDN);
sdelay(21000);
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLPWRDN);
} else {
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLEN |
PLLCTL_PLLENSRC);
sdelay(340);
}
pllctl_reg_write(data->pll, mult, pllm & PLLM_MULT_LO_MASK);
clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
PLLM_MULT_HI_SMASK, (pllm << 6));
/* Set the BWADJ (12 bit field) */
tmp_ctl = pllm >> 1; /* Divide the pllm by 2 */
clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
PLL_BWADJ_LO_SMASK,
(tmp_ctl << PLL_BWADJ_LO_SHIFT));
clrsetbits_le32(keystone_pll_regs[data->pll].reg1,
PLL_BWADJ_HI_MASK,
(tmp_ctl >> 8));
/*
* Set the pll divider (6 bit field) *
* PLLD[5:0] is located in MAINPLLCTL0
*/
clrsetbits_le32(keystone_pll_regs[data->pll].reg0,
PLL_DIV_MASK, plld);
/* Set the OUTPUT DIVIDE (4 bit field) in SECCTL */
pllctl_reg_rmw(data->pll, secctl, PLL_CLKOD_SMASK,
(pllod << PLL_CLKOD_SHIFT));
wait_for_completion(data);
pllctl_reg_write(data->pll, div1, PLLM_RATIO_DIV1);
pllctl_reg_write(data->pll, div2, PLLM_RATIO_DIV2);
pllctl_reg_write(data->pll, div3, PLLM_RATIO_DIV3);
pllctl_reg_write(data->pll, div4, PLLM_RATIO_DIV4);
pllctl_reg_write(data->pll, div5, PLLM_RATIO_DIV5);
pllctl_reg_setbits(data->pll, alnctl, 0x1f);
/*
* Set GOSET bit in PLLCMD to initiate the GO operation
* to change the divide
*/
pllctl_reg_setbits(data->pll, cmd, PLLSTAT_GO);
sdelay(1500); /* wait for the phase adj */
wait_for_completion(data);
/* Reset PLL */
pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLRST);
sdelay(21000); /* Wait for a minimum of 7 us*/
pllctl_reg_clrbits(data->pll, ctl, PLLCTL_PLLRST);
sdelay(105000); /* Wait for PLL Lock time (min 50 us) */
pllctl_reg_clrbits(data->pll, secctl, PLLCTL_BYPASS);
tmp = pllctl_reg_setbits(data->pll, ctl, PLLCTL_PLLEN);
} else if (data->pll == TETRIS_PLL) {
bwadj = pllm >> 1;
/* 1.5 Set PLLCTL0[BYPASS] =1 (enable bypass), */
setbits_le32(keystone_pll_regs[data->pll].reg0, PLLCTL_BYPASS);
/*
* Set CHIPMISCCTL1[13] = 0 (enable glitchfree bypass)
* only applicable for Kepler
*/
clrbits_le32(KS2_MISC_CTRL, KS2_ARM_PLL_EN);
/* 2 In PLLCTL1, write PLLRST = 1 (PLL is reset) */
setbits_le32(keystone_pll_regs[data->pll].reg1 ,
PLL_PLLRST | PLLCTL_ENSAT);
/*
* 3 Program PLLM and PLLD in PLLCTL0 register
* 4 Program BWADJ[7:0] in PLLCTL0 and BWADJ[11:8] in
* PLLCTL1 register. BWADJ value must be set
* to ((PLLM + 1) >> 1) – 1)
*/
tmp = ((bwadj & PLL_BWADJ_LO_MASK) << PLL_BWADJ_LO_SHIFT) |
(pllm << 6) |
(plld & PLL_DIV_MASK) |
(pllod << PLL_CLKOD_SHIFT) | PLLCTL_BYPASS;
__raw_writel(tmp, keystone_pll_regs[data->pll].reg0);
/* Set BWADJ[11:8] bits */
tmp = __raw_readl(keystone_pll_regs[data->pll].reg1);
tmp &= ~(PLL_BWADJ_HI_MASK);
tmp |= ((bwadj>>8) & PLL_BWADJ_HI_MASK);
__raw_writel(tmp, keystone_pll_regs[data->pll].reg1);
/*
* 5 Wait for at least 5 us based on the reference
* clock (PLL reset time)
*/
sdelay(21000); /* Wait for a minimum of 7 us*/
/* 6 In PLLCTL1, write PLLRST = 0 (PLL reset is released) */
clrbits_le32(keystone_pll_regs[data->pll].reg1, PLL_PLLRST);
/*
* 7 Wait for at least 500 * REFCLK cycles * (PLLD + 1)
* (PLL lock time)
*/
sdelay(105000);
/* 8 disable bypass */
clrbits_le32(keystone_pll_regs[data->pll].reg0, PLLCTL_BYPASS);
/*
* 9 Set CHIPMISCCTL1[13] = 1 (disable glitchfree bypass)
* only applicable for Kepler
*/
setbits_le32(KS2_MISC_CTRL, KS2_ARM_PLL_EN);
} else {
setbits_le32(keystone_pll_regs[data->pll].reg1, PLLCTL_ENSAT);
/*
* process keeps state of Bypass bit while programming
* all other DDR PLL settings
*/
tmp = __raw_readl(keystone_pll_regs[data->pll].reg0);
tmp &= PLLCTL_BYPASS; /* clear everything except Bypass */
/*
* Set the BWADJ[7:0], PLLD[5:0] and PLLM to PLLCTL0,
* bypass disabled
*/
bwadj = pllm >> 1;
tmp |= ((bwadj & PLL_BWADJ_LO_SHIFT) << PLL_BWADJ_LO_SHIFT) |
(pllm << PLL_MULT_SHIFT) |
(plld & PLL_DIV_MASK) |
(pllod << PLL_CLKOD_SHIFT);
__raw_writel(tmp, keystone_pll_regs[data->pll].reg0);
/* Set BWADJ[11:8] bits */
tmp = __raw_readl(keystone_pll_regs[data->pll].reg1);
tmp &= ~(PLL_BWADJ_HI_MASK);
tmp |= ((bwadj >> 8) & PLL_BWADJ_HI_MASK);
/* set PLL Select (bit 13) for PASS PLL */
if (data->pll == PASS_PLL)
tmp |= PLLCTL_PAPLL;
__raw_writel(tmp, keystone_pll_regs[data->pll].reg1);
/* Reset bit: bit 14 for both DDR3 & PASS PLL */
tmp = PLL_PLLRST;
/* Set RESET bit = 1 */
setbits_le32(keystone_pll_regs[data->pll].reg1, tmp);
/* Wait for a minimum of 7 us*/
sdelay(21000);
/* Clear RESET bit */
clrbits_le32(keystone_pll_regs[data->pll].reg1, tmp);
sdelay(105000);
/* clear BYPASS (Enable PLL Mode) */
clrbits_le32(keystone_pll_regs[data->pll].reg0, PLLCTL_BYPASS);
sdelay(21000); /* Wait for a minimum of 7 us*/
}
/*
* This is required to provide a delay between multiple
* consequent PPL configurations
*/
sdelay(210000);
}
void init_plls(int num_pll, struct pll_init_data *config)
{
int i;
for (i = 0; i < num_pll; i++)
init_pll(&config[i]);
}
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