u-boot/drivers/clk/rockchip/clk_rk322x.c

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/*
* (C) Copyright 2017 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0
*/
#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_rk322x.h>
#include <asm/arch/hardware.h>
#include <dm/lists.h>
#include <dt-bindings/clock/rk3228-cru.h>
#include <linux/log2.h>
DECLARE_GLOBAL_DATA_PTR;
enum {
VCO_MAX_HZ = 3200U * 1000000,
VCO_MIN_HZ = 800 * 1000000,
OUTPUT_MAX_HZ = 3200U * 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};\
_Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) * \
OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz, \
#hz "Hz cannot be hit with PLL "\
"divisors on line " __stringify(__LINE__));
/* 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 rk322x_cru *cru, enum rk_clk_id clk_id,
const struct pll_div *div)
{
int pll_id = rk_pll_id(clk_id);
struct rk322x_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: fb=%d, ref=%d, pst1=%d, pst2=%d, vco=%u Hz, output=%u Hz\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 void rkclk_init(struct rk322x_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 == GPLL_HZ && pclk_div <= 0x7);
hclk_div = BUS_ACLK_HZ / BUS_HCLK_HZ - 1;
assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_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,
GPLL_MODE_NORM << GPLL_MODE_SHIFT |
APLL_MODE_NORM << APLL_MODE_SHIFT);
}
/* Get pll rate by id */
static uint32_t rkclk_pll_get_rate(struct rk322x_cru *cru,
enum rk_clk_id clk_id)
{
uint32_t refdiv, fbdiv, postdiv1, postdiv2;
uint32_t con;
int pll_id = rk_pll_id(clk_id);
struct rk322x_pll *pll = &cru->pll[pll_id];
static u8 clk_shift[CLK_COUNT] = {
0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
GPLL_MODE_SHIFT, 0xff
};
static u32 clk_mask[CLK_COUNT] = {
0xff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xff,
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;
default:
return 32768;
}
}
static ulong rockchip_mmc_get_clk(struct rk322x_cru *cru, uint clk_general_rate,
int periph)
{
uint src_rate;
uint div, mux;
u32 con;
switch (periph) {
case HCLK_EMMC:
case SCLK_EMMC:
con = readl(&cru->cru_clksel_con[11]);
mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
con = readl(&cru->cru_clksel_con[12]);
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) / 2;
}
static ulong rk322x_mac_set_clk(struct rk322x_cru *cru, uint freq)
{
ulong ret;
/*
* The gmac clock can be derived either from an external clock
* or can be generated from internally by a divider from SCLK_MAC.
*/
if (readl(&cru->cru_clksel_con[5]) & BIT(5)) {
/* An external clock will always generate the right rate... */
ret = freq;
} else {
u32 con = readl(&cru->cru_clksel_con[5]);
ulong pll_rate;
u8 div;
if ((con >> MAC_PLL_SEL_SHIFT) & MAC_PLL_SEL_MASK)
pll_rate = GPLL_HZ;
else
/* CPLL is not set */
return -EPERM;
div = DIV_ROUND_UP(pll_rate, freq) - 1;
if (div <= 0x1f)
rk_clrsetreg(&cru->cru_clksel_con[5], CLK_MAC_DIV_MASK,
div << CLK_MAC_DIV_SHIFT);
else
debug("Unsupported div for gmac:%d\n", div);
return DIV_TO_RATE(pll_rate, div);
}
return ret;
}
static ulong rockchip_mmc_set_clk(struct rk322x_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);
assert(src_clk_div - 1 < 128);
mux = EMMC_SEL_24M;
} else {
mux = EMMC_SEL_GPLL;
}
switch (periph) {
case HCLK_EMMC:
case SCLK_EMMC:
rk_clrsetreg(&cru->cru_clksel_con[11],
EMMC_PLL_MASK,
mux << EMMC_PLL_SHIFT);
rk_clrsetreg(&cru->cru_clksel_con[12],
EMMC_DIV_MASK,
(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 int rk322x_ddr_set_clk(struct rk322x_cru *cru, unsigned int set_rate)
{
struct pll_div dpll_cfg;
/* clk_ddrc == DPLL = 24MHz / refdiv * fbdiv / postdiv1 / postdiv2 */
switch (set_rate) {
case 400*MHz:
dpll_cfg = (struct pll_div)
{.refdiv = 1, .fbdiv = 50, .postdiv1 = 3, .postdiv2 = 1};
break;
case 600*MHz:
dpll_cfg = (struct pll_div)
{.refdiv = 1, .fbdiv = 75, .postdiv1 = 3, .postdiv2 = 1};
break;
case 800*MHz:
dpll_cfg = (struct pll_div)
{.refdiv = 1, .fbdiv = 100, .postdiv1 = 3, .postdiv2 = 1};
break;
}
/* pll enter slow-mode */
rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
DPLL_MODE_SLOW << DPLL_MODE_SHIFT);
rkclk_set_pll(cru, CLK_DDR, &dpll_cfg);
/* PLL enter normal-mode */
rk_clrsetreg(&cru->cru_mode_con, DPLL_MODE_MASK,
DPLL_MODE_NORM << DPLL_MODE_SHIFT);
return set_rate;
}
static ulong rk322x_clk_get_rate(struct clk *clk)
{
struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
ulong rate, gclk_rate;
gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
switch (clk->id) {
case 0 ... 63:
rate = rkclk_pll_get_rate(priv->cru, clk->id);
break;
case HCLK_EMMC:
case SCLK_EMMC:
case HCLK_SDMMC:
case SCLK_SDMMC:
rate = rockchip_mmc_get_clk(priv->cru, gclk_rate, clk->id);
break;
default:
return -ENOENT;
}
return rate;
}
static ulong rk322x_clk_set_rate(struct clk *clk, ulong rate)
{
struct rk322x_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 HCLK_EMMC:
case SCLK_EMMC:
case HCLK_SDMMC:
case SCLK_SDMMC:
new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
clk->id, rate);
break;
case CLK_DDR:
new_rate = rk322x_ddr_set_clk(priv->cru, rate);
break;
case SCLK_MAC:
new_rate = rk322x_mac_set_clk(priv->cru, rate);
break;
case PLL_GPLL:
return 0;
default:
return -ENOENT;
}
return new_rate;
}
static int rk322x_gmac_set_parent(struct clk *clk, struct clk *parent)
{
struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
struct rk322x_cru *cru = priv->cru;
/*
* If the requested parent is in the same clock-controller and the id
* is SCLK_MAC_SRC ("sclk_gmac_src"), switch to the internal clock.
*/
if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC_SRC)) {
debug("%s: switching RGMII to SCLK_MAC_SRC\n", __func__);
rk_clrsetreg(&cru->cru_clksel_con[5], BIT(5), 0);
return 0;
}
/*
* If the requested parent is in the same clock-controller and the id
* is SCLK_MAC_EXTCLK (sclk_mac_extclk), switch to the external clock.
*/
if ((parent->dev == clk->dev) && (parent->id == SCLK_MAC_EXTCLK)) {
debug("%s: switching RGMII to SCLK_MAC_EXTCLK\n", __func__);
rk_clrsetreg(&cru->cru_clksel_con[5], BIT(5), BIT(5));
return 0;
}
return -EINVAL;
}
static int rk322x_gmac_extclk_set_parent(struct clk *clk, struct clk *parent)
{
struct rk322x_clk_priv *priv = dev_get_priv(clk->dev);
const char *clock_output_name;
struct rk322x_cru *cru = priv->cru;
int ret;
ret = dev_read_string_index(parent->dev, "clock-output-names",
parent->id, &clock_output_name);
if (ret < 0)
return -ENODATA;
if (!strcmp(clock_output_name, "ext_gmac")) {
debug("%s: switching gmac extclk to ext_gmac\n", __func__);
rk_clrsetreg(&cru->cru_clksel_con[29], BIT(10), 0);
return 0;
} else if (!strcmp(clock_output_name, "phy_50m_out")) {
debug("%s: switching gmac extclk to phy_50m_out\n", __func__);
rk_clrsetreg(&cru->cru_clksel_con[29], BIT(10), BIT(10));
return 0;
}
return -EINVAL;
}
static int rk322x_clk_set_parent(struct clk *clk, struct clk *parent)
{
switch (clk->id) {
case SCLK_MAC:
return rk322x_gmac_set_parent(clk, parent);
case SCLK_MAC_EXTCLK:
return rk322x_gmac_extclk_set_parent(clk, parent);
}
debug("%s: unsupported clk %ld\n", __func__, clk->id);
return -ENOENT;
}
static struct clk_ops rk322x_clk_ops = {
.get_rate = rk322x_clk_get_rate,
.set_rate = rk322x_clk_set_rate,
.set_parent = rk322x_clk_set_parent,
};
static int rk322x_clk_ofdata_to_platdata(struct udevice *dev)
{
struct rk322x_clk_priv *priv = dev_get_priv(dev);
priv->cru = (struct rk322x_cru *)devfdt_get_addr(dev);
return 0;
}
static int rk322x_clk_probe(struct udevice *dev)
{
struct rk322x_clk_priv *priv = dev_get_priv(dev);
rkclk_init(priv->cru);
return 0;
}
static int rk322x_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 rk322x_cru,
cru_glb_srst_fst_value);
priv->glb_srst_snd_value = offsetof(struct rk322x_cru,
cru_glb_srst_snd_value);
sys_child->priv = priv;
}
#if CONFIG_IS_ENABLED(CONFIG_RESET_ROCKCHIP)
ret = offsetof(struct rk322x_cru, cru_softrst_con[0]);
ret = rockchip_reset_bind(dev, ret, 9);
if (ret)
debug("Warning: software reset driver bind faile\n");
#endif
return 0;
}
static const struct udevice_id rk322x_clk_ids[] = {
{ .compatible = "rockchip,rk3228-cru" },
{ }
};
U_BOOT_DRIVER(rockchip_rk322x_cru) = {
.name = "clk_rk322x",
.id = UCLASS_CLK,
.of_match = rk322x_clk_ids,
.priv_auto_alloc_size = sizeof(struct rk322x_clk_priv),
.ofdata_to_platdata = rk322x_clk_ofdata_to_platdata,
.ops = &rk322x_clk_ops,
.bind = rk322x_clk_bind,
.probe = rk322x_clk_probe,
};