u-boot-brain/drivers/clk/rockchip/clk_rk3128.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

603 lines
15 KiB
C

// 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 <syscon.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/cru_rk3128.h>
#include <asm/arch/hardware.h>
#include <bitfield.h>
#include <dm/lists.h>
#include <dt-bindings/clock/rk3128-cru.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,
};