u-boot/drivers/clk/rockchip/clk_rk3128.c

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// SPDX-License-Identifier: GPL-2.0
/*
* (C) Copyright 2017 Rockchip Electronics Co., Ltd
*/
#include <common.h>
#include <clk-uclass.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch-rockchip/clock.h>
#include <asm/arch-rockchip/cru_rk3128.h>
#include <asm/arch-rockchip/hardware.h>
#include <bitfield.h>
#include <dm/lists.h>
#include <dt-bindings/clock/rk3128-cru.h>
#include <linux/delay.h>
#include <linux/log2.h>
enum {
VCO_MAX_HZ = 2400U * 1000000,
VCO_MIN_HZ = 600 * 1000000,
OUTPUT_MAX_HZ = 2400U * 1000000,
OUTPUT_MIN_HZ = 24 * 1000000,
};
#define DIV_TO_RATE(input_rate, div) ((input_rate) / ((div) + 1))
#define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
.refdiv = _refdiv,\
.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};
/* use integer mode*/
static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
static int rkclk_set_pll(struct rk3128_cru *cru, enum rk_clk_id clk_id,
const struct pll_div *div)
{
int pll_id = rk_pll_id(clk_id);
struct rk3128_pll *pll = &cru->pll[pll_id];
/* All PLLs have same VCO and output frequency range restrictions. */
uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
debug("PLL at %p:fd=%d,rd=%d,pd1=%d,pd2=%d,vco=%uHz,output=%uHz\n",
pll, div->fbdiv, div->refdiv, div->postdiv1,
div->postdiv2, vco_hz, output_hz);
assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
/* use integer mode */
rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
/* Power down */
rk_setreg(&pll->con1, 1 << PLL_PD_SHIFT);
rk_clrsetreg(&pll->con0,
PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
(div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
(div->postdiv2 << PLL_POSTDIV2_SHIFT |
div->refdiv << PLL_REFDIV_SHIFT));
/* Power Up */
rk_clrreg(&pll->con1, 1 << PLL_PD_SHIFT);
/* waiting for pll lock */
while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
udelay(1);
return 0;
}
static int pll_para_config(u32 freq_hz, struct pll_div *div)
{
u32 ref_khz = OSC_HZ / 1000, refdiv, fbdiv = 0;
u32 postdiv1, postdiv2 = 1;
u32 fref_khz;
u32 diff_khz, best_diff_khz;
const u32 max_refdiv = 63, max_fbdiv = 3200, min_fbdiv = 16;
const u32 max_postdiv1 = 7, max_postdiv2 = 7;
u32 vco_khz;
u32 freq_khz = freq_hz / 1000;
if (!freq_hz) {
printf("%s: the frequency can't be 0 Hz\n", __func__);
return -1;
}
postdiv1 = DIV_ROUND_UP(VCO_MIN_HZ / 1000, freq_khz);
if (postdiv1 > max_postdiv1) {
postdiv2 = DIV_ROUND_UP(postdiv1, max_postdiv1);
postdiv1 = DIV_ROUND_UP(postdiv1, postdiv2);
}
vco_khz = freq_khz * postdiv1 * postdiv2;
if (vco_khz < (VCO_MIN_HZ / 1000) || vco_khz > (VCO_MAX_HZ / 1000) ||
postdiv2 > max_postdiv2) {
printf("%s: Cannot find out a supported VCO for Freq (%uHz)\n",
__func__, freq_hz);
return -1;
}
div->postdiv1 = postdiv1;
div->postdiv2 = postdiv2;
best_diff_khz = vco_khz;
for (refdiv = 1; refdiv < max_refdiv && best_diff_khz; refdiv++) {
fref_khz = ref_khz / refdiv;
fbdiv = vco_khz / fref_khz;
if ((fbdiv >= max_fbdiv) || (fbdiv <= min_fbdiv))
continue;
diff_khz = vco_khz - fbdiv * fref_khz;
if (fbdiv + 1 < max_fbdiv && diff_khz > fref_khz / 2) {
fbdiv++;
diff_khz = fref_khz - diff_khz;
}
if (diff_khz >= best_diff_khz)
continue;
best_diff_khz = diff_khz;
div->refdiv = refdiv;
div->fbdiv = fbdiv;
}
if (best_diff_khz > 4 * (1000)) {
printf("%s: Failed to match output frequency %u bestis %u Hz\n",
__func__, freq_hz,
best_diff_khz * 1000);
return -1;
}
return 0;
}
static void rkclk_init(struct rk3128_cru *cru)
{
u32 aclk_div;
u32 hclk_div;
u32 pclk_div;
/* pll enter slow-mode */
rk_clrsetreg(&cru->cru_mode_con,
GPLL_MODE_MASK | APLL_MODE_MASK,
GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
APLL_MODE_SLOW << APLL_MODE_SHIFT);
/* init pll */
rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
/*
* select apll as cpu/core clock pll source and
* set up dependent divisors for PERI and ACLK clocks.
* core hz : apll = 1:1
*/
aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
rk_clrsetreg(&cru->cru_clksel_con[0],
CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
0 << CORE_DIV_CON_SHIFT);
rk_clrsetreg(&cru->cru_clksel_con[1],
CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
aclk_div << CORE_ACLK_DIV_SHIFT |
pclk_div << CORE_PERI_DIV_SHIFT);
/*
* select gpll as pd_bus bus clock source and
* set up dependent divisors for PCLK/HCLK and ACLK clocks.
*/
aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
pclk_div = BUS_ACLK_HZ / BUS_PCLK_HZ - 1;
assert((pclk_div + 1) * BUS_PCLK_HZ == BUS_ACLK_HZ && pclk_div <= 0x7);
hclk_div = BUS_ACLK_HZ / BUS_HCLK_HZ - 1;
assert((hclk_div + 1) * BUS_HCLK_HZ == BUS_ACLK_HZ && hclk_div <= 0x3);
rk_clrsetreg(&cru->cru_clksel_con[0],
BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
aclk_div << BUS_ACLK_DIV_SHIFT);
rk_clrsetreg(&cru->cru_clksel_con[1],
BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
pclk_div << BUS_PCLK_DIV_SHIFT |
hclk_div << BUS_HCLK_DIV_SHIFT);
/*
* select gpll as pd_peri bus clock source and
* set up dependent divisors for PCLK/HCLK and ACLK clocks.
*/
aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
assert((1 << hclk_div) * PERI_HCLK_HZ ==
PERI_ACLK_HZ && (hclk_div < 0x4));
pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
assert((1 << pclk_div) * PERI_PCLK_HZ ==
PERI_ACLK_HZ && pclk_div < 0x8);
rk_clrsetreg(&cru->cru_clksel_con[10],
PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
pclk_div << PERI_PCLK_DIV_SHIFT |
hclk_div << PERI_HCLK_DIV_SHIFT |
aclk_div << PERI_ACLK_DIV_SHIFT);
/* PLL enter normal-mode */
rk_clrsetreg(&cru->cru_mode_con,
GPLL_MODE_MASK | APLL_MODE_MASK | CPLL_MODE_MASK,
GPLL_MODE_NORM << GPLL_MODE_SHIFT |
APLL_MODE_NORM << APLL_MODE_SHIFT |
CPLL_MODE_NORM << CPLL_MODE_SHIFT);
/*fix NAND controller working clock max to 150Mhz */
rk_clrsetreg(&cru->cru_clksel_con[2],
NANDC_PLL_SEL_MASK | NANDC_CLK_DIV_MASK,
NANDC_PLL_SEL_GPLL << NANDC_PLL_SEL_SHIFT |
3 << NANDC_CLK_DIV_SHIFT);
}
/* Get pll rate by id */
static u32 rkclk_pll_get_rate(struct rk3128_cru *cru,
enum rk_clk_id clk_id)
{
u32 refdiv, fbdiv, postdiv1, postdiv2;
u32 con;
int pll_id = rk_pll_id(clk_id);
struct rk3128_pll *pll = &cru->pll[pll_id];
static u8 clk_shift[CLK_COUNT] = {
0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, CPLL_MODE_SHIFT,
GPLL_MODE_SHIFT, 0xff
};
static u32 clk_mask[CLK_COUNT] = {
0xff, APLL_MODE_MASK, DPLL_MODE_MASK, CPLL_MODE_MASK,
GPLL_MODE_MASK, 0xff
};
uint shift;
uint mask;
con = readl(&cru->cru_mode_con);
shift = clk_shift[clk_id];
mask = clk_mask[clk_id];
switch ((con & mask) >> shift) {
case GPLL_MODE_SLOW:
return OSC_HZ;
case GPLL_MODE_NORM:
/* normal mode */
con = readl(&pll->con0);
postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
con = readl(&pll->con1);
postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
case GPLL_MODE_DEEP:
default:
return 32768;
}
}
static ulong rockchip_mmc_get_clk(struct rk3128_cru *cru, uint clk_general_rate,
int periph)
{
uint src_rate;
uint div, mux;
u32 con;
switch (periph) {
case HCLK_EMMC:
case SCLK_EMMC:
case SCLK_EMMC_SAMPLE:
con = readl(&cru->cru_clksel_con[12]);
mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
break;
case HCLK_SDMMC:
case SCLK_SDMMC:
con = readl(&cru->cru_clksel_con[11]);
mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
break;
default:
return -EINVAL;
}
src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
return DIV_TO_RATE(src_rate, div);
}
static ulong rockchip_mmc_set_clk(struct rk3128_cru *cru, uint clk_general_rate,
int periph, uint freq)
{
int src_clk_div;
int mux;
debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
/* mmc clock defaulg div 2 internal, need provide double in cru */
src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
if (src_clk_div > 128) {
src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
mux = EMMC_SEL_24M;
} else {
mux = EMMC_SEL_GPLL;
}
switch (periph) {
case HCLK_EMMC:
rk_clrsetreg(&cru->cru_clksel_con[12],
EMMC_PLL_MASK | EMMC_DIV_MASK,
mux << EMMC_PLL_SHIFT |
(src_clk_div - 1) << EMMC_DIV_SHIFT);
break;
case HCLK_SDMMC:
case SCLK_SDMMC:
rk_clrsetreg(&cru->cru_clksel_con[11],
MMC0_PLL_MASK | MMC0_DIV_MASK,
mux << MMC0_PLL_SHIFT |
(src_clk_div - 1) << MMC0_DIV_SHIFT);
break;
default:
return -EINVAL;
}
return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
}
static ulong rk3128_peri_get_pclk(struct rk3128_cru *cru, ulong clk_id)
{
u32 div, con;
switch (clk_id) {
case PCLK_I2C0:
case PCLK_I2C1:
case PCLK_I2C2:
case PCLK_I2C3:
case PCLK_PWM:
con = readl(&cru->cru_clksel_con[10]);
div = con >> 12 & 0x3;
break;
default:
printf("do not support this peripheral bus\n");
return -EINVAL;
}
return DIV_TO_RATE(PERI_ACLK_HZ, div);
}
static ulong rk3128_peri_set_pclk(struct rk3128_cru *cru, ulong clk_id, uint hz)
{
int src_clk_div;
src_clk_div = PERI_ACLK_HZ / hz;
assert(src_clk_div - 1 < 4);
switch (clk_id) {
case PCLK_I2C0:
case PCLK_I2C1:
case PCLK_I2C2:
case PCLK_I2C3:
case PCLK_PWM:
rk_setreg(&cru->cru_clksel_con[10],
((src_clk_div - 1) << 12));
break;
default:
printf("do not support this peripheral bus\n");
return -EINVAL;
}
return DIV_TO_RATE(PERI_ACLK_HZ, src_clk_div);
}
static ulong rk3128_saradc_get_clk(struct rk3128_cru *cru)
{
u32 div, val;
val = readl(&cru->cru_clksel_con[24]);
div = bitfield_extract(val, SARADC_DIV_CON_SHIFT,
SARADC_DIV_CON_WIDTH);
return DIV_TO_RATE(OSC_HZ, div);
}
static ulong rk3128_saradc_set_clk(struct rk3128_cru *cru, uint hz)
{
int src_clk_div;
src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
assert(src_clk_div < 128);
rk_clrsetreg(&cru->cru_clksel_con[24],
SARADC_DIV_CON_MASK,
src_clk_div << SARADC_DIV_CON_SHIFT);
return rk3128_saradc_get_clk(cru);
}
static ulong rk3128_vop_set_clk(struct rk3128_cru *cru, ulong clk_id, uint hz)
{
int src_clk_div;
struct pll_div cpll_config = {0};
src_clk_div = GPLL_HZ / hz;
assert(src_clk_div - 1 < 31);
switch (clk_id) {
case ACLK_VIO0:
rk_clrsetreg(&cru->cru_clksel_con[31],
VIO0_PLL_MASK | VIO0_DIV_MASK,
VIO0_SEL_GPLL << VIO0_PLL_SHIFT |
(src_clk_div - 1) << VIO0_DIV_SHIFT);
break;
case ACLK_VIO1:
rk_clrsetreg(&cru->cru_clksel_con[31],
VIO1_PLL_MASK | VIO1_DIV_MASK,
VIO1_SEL_GPLL << VIO1_PLL_SHIFT |
(src_clk_div - 1) << VIO1_DIV_SHIFT);
break;
case DCLK_LCDC:
if (pll_para_config(hz, &cpll_config))
return -1;
rkclk_set_pll(cru, CLK_CODEC, &cpll_config);
rk_clrsetreg(&cru->cru_clksel_con[27],
DCLK_VOP_SEL_MASK | DCLK_VOP_DIV_CON_MASK,
DCLK_VOP_PLL_SEL_CPLL << DCLK_VOP_SEL_SHIFT |
(1 - 1) << DCLK_VOP_DIV_CON_SHIFT);
break;
default:
printf("do not support this vop freq\n");
return -EINVAL;
}
return hz;
}
static ulong rk3128_vop_get_rate(struct rk3128_cru *cru, ulong clk_id)
{
u32 div, con, parent;
switch (clk_id) {
case ACLK_VIO0:
con = readl(&cru->cru_clksel_con[31]);
div = con & 0x1f;
parent = GPLL_HZ;
break;
case ACLK_VIO1:
con = readl(&cru->cru_clksel_con[31]);
div = (con >> 8) & 0x1f;
parent = GPLL_HZ;
break;
case DCLK_LCDC:
con = readl(&cru->cru_clksel_con[27]);
div = (con >> 8) & 0xfff;
parent = rkclk_pll_get_rate(cru, CLK_CODEC);
break;
default:
return -ENOENT;
}
return DIV_TO_RATE(parent, div);
}
static ulong rk3128_clk_get_rate(struct clk *clk)
{
struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);
switch (clk->id) {
case 0 ... 63:
return rkclk_pll_get_rate(priv->cru, clk->id);
case PCLK_I2C0:
case PCLK_I2C1:
case PCLK_I2C2:
case PCLK_I2C3:
case PCLK_PWM:
return rk3128_peri_get_pclk(priv->cru, clk->id);
case SCLK_SARADC:
return rk3128_saradc_get_clk(priv->cru);
case DCLK_LCDC:
case ACLK_VIO0:
case ACLK_VIO1:
return rk3128_vop_get_rate(priv->cru, clk->id);
default:
return -ENOENT;
}
}
static ulong rk3128_clk_set_rate(struct clk *clk, ulong rate)
{
struct rk3128_clk_priv *priv = dev_get_priv(clk->dev);
ulong new_rate, gclk_rate;
gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
switch (clk->id) {
case 0 ... 63:
return 0;
case DCLK_LCDC:
case ACLK_VIO0:
case ACLK_VIO1:
new_rate = rk3128_vop_set_clk(priv->cru,
clk->id, rate);
break;
case HCLK_EMMC:
new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
clk->id, rate);
break;
case PCLK_I2C0:
case PCLK_I2C1:
case PCLK_I2C2:
case PCLK_I2C3:
case PCLK_PWM:
new_rate = rk3128_peri_set_pclk(priv->cru, clk->id, rate);
break;
case SCLK_SARADC:
new_rate = rk3128_saradc_set_clk(priv->cru, rate);
break;
default:
return -ENOENT;
}
return new_rate;
}
static struct clk_ops rk3128_clk_ops = {
.get_rate = rk3128_clk_get_rate,
.set_rate = rk3128_clk_set_rate,
};
static int rk3128_clk_ofdata_to_platdata(struct udevice *dev)
{
struct rk3128_clk_priv *priv = dev_get_priv(dev);
priv->cru = dev_read_addr_ptr(dev);
return 0;
}
static int rk3128_clk_probe(struct udevice *dev)
{
struct rk3128_clk_priv *priv = dev_get_priv(dev);
rkclk_init(priv->cru);
return 0;
}
static int rk3128_clk_bind(struct udevice *dev)
{
int ret;
struct udevice *sys_child;
struct sysreset_reg *priv;
/* The reset driver does not have a device node, so bind it here */
ret = device_bind_driver(dev, "rockchip_sysreset", "sysreset",
&sys_child);
if (ret) {
debug("Warning: No sysreset driver: ret=%d\n", ret);
} else {
priv = malloc(sizeof(struct sysreset_reg));
priv->glb_srst_fst_value = offsetof(struct rk3128_cru,
cru_glb_srst_fst_value);
priv->glb_srst_snd_value = offsetof(struct rk3128_cru,
cru_glb_srst_snd_value);
sys_child->priv = priv;
}
return 0;
}
static const struct udevice_id rk3128_clk_ids[] = {
{ .compatible = "rockchip,rk3128-cru" },
{ .compatible = "rockchip,rk3126-cru" },
{ }
};
U_BOOT_DRIVER(rockchip_rk3128_cru) = {
.name = "clk_rk3128",
.id = UCLASS_CLK,
.of_match = rk3128_clk_ids,
.priv_auto_alloc_size = sizeof(struct rk3128_clk_priv),
.ofdata_to_platdata = rk3128_clk_ofdata_to_platdata,
.ops = &rk3128_clk_ops,
.bind = rk3128_clk_bind,
.probe = rk3128_clk_probe,
};