u-boot/drivers/clk/starfive/clk-jh7110-pll.c
Yanhong Wang c13fe7c034 clk: starfive: Add StarFive JH7110 clock driver
Add a DM clock driver for StarFive JH7110 SoC.

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Tested-by: Conor Dooley <conor.dooley@microchip.com>
2023-04-20 16:08:44 +08:00

321 lines
8.7 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2022-23 StarFive Technology Co., Ltd.
*
* Author: Yanhong Wang <yanhong.wang@starfivetech.com>
*/
#include <common.h>
#include <asm/io.h>
#include <malloc.h>
#include <clk-uclass.h>
#include <div64.h>
#include <dm/device.h>
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/err.h>
#include "clk.h"
#define UBOOT_DM_CLK_JH7110_PLLX "jh7110_clk_pllx"
#define PLL_PD_OFF 1
#define PLL_PD_ON 0
#define CLK_DDR_BUS_MASK GENMASK(29, 24)
#define CLK_DDR_BUS_OFFSET 0xAC
#define CLK_DDR_BUS_OSC_DIV2 0
#define CLK_DDR_BUS_PLL1_DIV2 1
#define CLK_DDR_BUS_PLL1_DIV4 2
#define CLK_DDR_BUS_PLL1_DIV8 3
struct clk_jh7110_pllx {
struct clk clk;
void __iomem *base;
void __iomem *sysreg;
enum starfive_pll_type type;
const struct starfive_pllx_offset *offset;
const struct starfive_pllx_rate *rate_table;
int rate_count;
};
#define getbits_le32(addr, mask) ((in_le32(addr) & (mask)) >> __ffs((mask)))
#define PLLX_SET(offset, mask, val) do {\
reg = readl((ulong *)((ulong)pll->base + (offset))); \
reg &= ~(mask); \
reg |= (mask) & ((val) << __ffs(mask)); \
writel(reg, (ulong *)((ulong)pll->base + (offset))); \
} while (0)
#define PLLX_RATE(_rate, _pd, _fd) \
{ \
.rate = (_rate), \
.prediv = (_pd), \
.fbdiv = (_fd), \
}
#define to_clk_pllx(_clk) container_of(_clk, struct clk_jh7110_pllx, clk)
static const struct starfive_pllx_rate jh7110_pll0_tbl[] = {
PLLX_RATE(375000000UL, 8, 125),
PLLX_RATE(500000000UL, 6, 125),
PLLX_RATE(625000000UL, 24, 625),
PLLX_RATE(750000000UL, 4, 125),
PLLX_RATE(875000000UL, 24, 875),
PLLX_RATE(1000000000UL, 3, 125),
PLLX_RATE(1250000000UL, 12, 625),
PLLX_RATE(1375000000UL, 24, 1375),
PLLX_RATE(1500000000UL, 2, 125),
PLLX_RATE(1625000000UL, 24, 1625),
PLLX_RATE(1750000000UL, 12, 875),
PLLX_RATE(1800000000UL, 3, 225),
};
static const struct starfive_pllx_rate jh7110_pll1_tbl[] = {
PLLX_RATE(1066000000UL, 12, 533),
PLLX_RATE(1200000000UL, 1, 50),
PLLX_RATE(1400000000UL, 6, 350),
PLLX_RATE(1600000000UL, 3, 200),
};
static const struct starfive_pllx_rate jh7110_pll2_tbl[] = {
PLLX_RATE(1228800000UL, 15, 768),
PLLX_RATE(1188000000UL, 2, 99),
};
static const struct starfive_pllx_offset jh7110_pll0_offset = {
.pd = 0x20,
.prediv = 0x24,
.fbdiv = 0x1c,
.frac = 0x20,
.postdiv1 = 0x20,
.dacpd = 0x18,
.dsmpd = 0x18,
.pd_mask = BIT(27),
.prediv_mask = GENMASK(5, 0),
.fbdiv_mask = GENMASK(11, 0),
.frac_mask = GENMASK(23, 0),
.postdiv1_mask = GENMASK(29, 28),
.dacpd_mask = BIT(24),
.dsmpd_mask = BIT(25)
};
static const struct starfive_pllx_offset jh7110_pll1_offset = {
.pd = 0x28,
.prediv = 0x2c,
.fbdiv = 0x24,
.frac = 0x28,
.postdiv1 = 0x28,
.dacpd = 0x24,
.dsmpd = 0x24,
.pd_mask = BIT(27),
.prediv_mask = GENMASK(5, 0),
.fbdiv_mask = GENMASK(28, 17),
.frac_mask = GENMASK(23, 0),
.postdiv1_mask = GENMASK(29, 28),
.dacpd_mask = BIT(15),
.dsmpd_mask = BIT(16)
};
static const struct starfive_pllx_offset jh7110_pll2_offset = {
.pd = 0x30,
.prediv = 0x34,
.fbdiv = 0x2c,
.frac = 0x30,
.postdiv1 = 0x30,
.dacpd = 0x2c,
.dsmpd = 0x2c,
.pd_mask = BIT(27),
.prediv_mask = GENMASK(5, 0),
.fbdiv_mask = GENMASK(28, 17),
.frac_mask = GENMASK(23, 0),
.postdiv1_mask = GENMASK(29, 28),
.dacpd_mask = BIT(15),
.dsmpd_mask = BIT(16)
};
struct starfive_pllx_clk starfive_jh7110_pll0 __initdata = {
.type = PLL0,
.offset = &jh7110_pll0_offset,
.rate_table = jh7110_pll0_tbl,
.rate_count = ARRAY_SIZE(jh7110_pll0_tbl),
};
struct starfive_pllx_clk starfive_jh7110_pll1 __initdata = {
.type = PLL1,
.offset = &jh7110_pll1_offset,
.rate_table = jh7110_pll1_tbl,
.rate_count = ARRAY_SIZE(jh7110_pll1_tbl),
};
struct starfive_pllx_clk starfive_jh7110_pll2 __initdata = {
.type = PLL2,
.offset = &jh7110_pll2_offset,
.rate_table = jh7110_pll2_tbl,
.rate_count = ARRAY_SIZE(jh7110_pll2_tbl),
};
static const struct starfive_pllx_rate *
jh7110_get_pll_settings(struct clk_jh7110_pllx *pll, unsigned long rate)
{
for (int i = 0; i < pll->rate_count; i++)
if (rate == pll->rate_table[i].rate)
return &pll->rate_table[i];
return NULL;
}
static void jh7110_pll_set_rate(struct clk_jh7110_pllx *pll,
const struct starfive_pllx_rate *rate)
{
u32 reg;
bool set = (pll->type == PLL1) ? true : false;
if (set) {
reg = readl((ulong *)((ulong)pll->sysreg + CLK_DDR_BUS_OFFSET));
reg &= ~CLK_DDR_BUS_MASK;
reg |= CLK_DDR_BUS_OSC_DIV2 << __ffs(CLK_DDR_BUS_MASK);
writel(reg, (ulong *)((ulong)pll->sysreg + CLK_DDR_BUS_OFFSET));
}
PLLX_SET(pll->offset->pd, pll->offset->pd_mask, PLL_PD_OFF);
PLLX_SET(pll->offset->dacpd, pll->offset->dacpd_mask, 1);
PLLX_SET(pll->offset->dsmpd, pll->offset->dsmpd_mask, 1);
PLLX_SET(pll->offset->prediv, pll->offset->prediv_mask, rate->prediv);
PLLX_SET(pll->offset->fbdiv, pll->offset->fbdiv_mask, rate->fbdiv);
PLLX_SET(pll->offset->postdiv1, pll->offset->postdiv1, 0);
PLLX_SET(pll->offset->pd, pll->offset->pd_mask, PLL_PD_ON);
if (set) {
udelay(100);
reg = readl((ulong *)((ulong)pll->sysreg + CLK_DDR_BUS_OFFSET));
reg &= ~CLK_DDR_BUS_MASK;
reg |= CLK_DDR_BUS_PLL1_DIV2 << __ffs(CLK_DDR_BUS_MASK);
writel(reg, (ulong *)((ulong)pll->sysreg + CLK_DDR_BUS_OFFSET));
}
}
static ulong jh7110_pllx_recalc_rate(struct clk *clk)
{
struct clk_jh7110_pllx *pll = to_clk_pllx(dev_get_clk_ptr(clk->dev));
u64 refclk = clk_get_parent_rate(clk);
u32 dacpd, dsmpd;
u32 prediv, fbdiv, postdiv1;
u64 frac;
dacpd = getbits_le32((ulong)pll->base + pll->offset->dacpd,
pll->offset->dacpd_mask);
dsmpd = getbits_le32((ulong)pll->base + pll->offset->dsmpd,
pll->offset->dsmpd_mask);
prediv = getbits_le32((ulong)pll->base + pll->offset->prediv,
pll->offset->prediv_mask);
fbdiv = getbits_le32((ulong)pll->base + pll->offset->fbdiv,
pll->offset->fbdiv_mask);
postdiv1 = 1 << getbits_le32((ulong)pll->base + pll->offset->postdiv1,
pll->offset->postdiv1_mask);
frac = (u64)getbits_le32((ulong)pll->base + pll->offset->frac,
pll->offset->frac_mask);
/* Integer Multiple Mode
* Both dacpd and dsmpd should be set as 1 while integer multiple mode.
*
* The frequency of outputs can be figured out as below.
*
* Fvco = Fref*Nl/M
* NI is integer frequency dividing ratio of feedback divider, set by fbdiv1[11:0] ,
* NI = 8, 9, 10, 12.13....4095
* M is frequency dividing ratio of pre-divider, set by prediv[5:0],M = 1,2...63
*
* Fclko1 = Fvco/Q1
* Q1 is frequency dividing ratio of post divider, set by postdiv1[1:0],Q1= 1,2,4,8
*
* Fraction Multiple Mode
*
* Both dacpd and dsmpd should be set as 0 while integer multiple mode.
*
* Fvco = Fref*(NI+NF)/M
* NI is integer frequency dividing ratio of feedback divider, set by fbdiv[11:0] ,
* NI = 8, 9, 10, 12.13....4095
* NF is fractional frequency dividing ratio, set by frac[23:0], NF =frac[23:0]/2^24= 0~0.99999994
* M is frequency dividing ratio of pre-divider, set by prediv[5:0],M = 1,2...63
*
* Fclko1 = Fvco/Q1
* Q1 is frequency dividing ratio of post divider, set by postdivl[1:0],Q1= 1,2,4,8
*/
if (dacpd == 1 && dsmpd == 1)
frac = 0;
else if (dacpd == 0 && dsmpd == 0)
do_div(frac, 1 << 24);
else
return -EINVAL;
refclk *= (fbdiv + frac);
do_div(refclk, prediv * postdiv1);
return refclk;
}
static ulong jh7110_pllx_set_rate(struct clk *clk, ulong drate)
{
struct clk_jh7110_pllx *pll = to_clk_pllx(dev_get_clk_ptr(clk->dev));
const struct starfive_pllx_rate *rate;
rate = jh7110_get_pll_settings(pll, drate);
if (!rate)
return -EINVAL;
jh7110_pll_set_rate(pll, rate);
return jh7110_pllx_recalc_rate(clk);
}
static const struct clk_ops clk_jh7110_ops = {
.set_rate = jh7110_pllx_set_rate,
.get_rate = jh7110_pllx_recalc_rate,
};
struct clk *starfive_jh7110_pll(const char *name, const char *parent_name,
void __iomem *base, void __iomem *sysreg,
const struct starfive_pllx_clk *pll_clk)
{
struct clk_jh7110_pllx *pll;
struct clk *clk;
int ret;
if (!pll_clk || !base || !sysreg)
return ERR_PTR(-EINVAL);
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
pll->base = base;
pll->sysreg = sysreg;
pll->type = pll_clk->type;
pll->offset = pll_clk->offset;
pll->rate_table = pll_clk->rate_table;
pll->rate_count = pll_clk->rate_count;
clk = &pll->clk;
ret = clk_register(clk, UBOOT_DM_CLK_JH7110_PLLX, name, parent_name);
if (ret) {
kfree(pll);
return ERR_PTR(ret);
}
if (IS_ENABLED(CONFIG_SPL_BUILD) && pll->type == PLL0)
jh7110_pllx_set_rate(clk, 1000000000);
if (IS_ENABLED(CONFIG_SPL_BUILD) && pll->type == PLL2)
jh7110_pllx_set_rate(clk, 1188000000);
return clk;
}
U_BOOT_DRIVER(jh7110_clk_pllx) = {
.name = UBOOT_DM_CLK_JH7110_PLLX,
.id = UCLASS_CLK,
.ops = &clk_jh7110_ops,
};