u-boot/drivers/clk/clk_rk3036.c
huang lin 3f2ef13924 rockchip: rk3036: Add clock driver
Add a driver for setting up and modifying the various PLLs, peripheral
clocks and mmc clocks on RK3036

Signed-off-by: Lin Huang <hl@rock-chips.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-12-01 08:07:22 -07:00

414 lines
11 KiB
C

/*
* (C) Copyright 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0
*/
#include <common.h>
#include <clk.h>
#include <dm.h>
#include <errno.h>
#include <syscon.h>
#include <asm/io.h>
#include <asm/arch/clock.h>
#include <asm/arch/cru_rk3036.h>
#include <asm/arch/hardware.h>
#include <asm/arch/periph.h>
#include <dm/lists.h>
DECLARE_GLOBAL_DATA_PTR;
struct rk3036_clk_plat {
enum rk_clk_id clk_id;
};
struct rk3036_clk_priv {
struct rk3036_cru *cru;
ulong rate;
};
enum {
VCO_MAX_HZ = 2400U * 1000000,
VCO_MIN_HZ = 600 * 1000000,
OUTPUT_MAX_HZ = 2400U * 1000000,
OUTPUT_MIN_HZ = 24 * 1000000,
};
#define RATE_TO_DIV(input_rate, output_rate) \
((input_rate) / (output_rate) - 1);
#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 interge 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 inline unsigned int log2(unsigned int value)
{
return fls(value) - 1;
}
static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
const struct pll_div *div)
{
int pll_id = rk_pll_id(clk_id);
struct rk3036_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: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%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 interger mode */
rk_clrreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
rk_clrsetreg(&pll->con0,
PLL_POSTDIV1_MASK << PLL_POSTDIV1_SHIFT | PLL_FBDIV_MASK,
(div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK << PLL_POSTDIV2_SHIFT |
PLL_REFDIV_MASK << PLL_REFDIV_SHIFT,
(div->postdiv2 << PLL_POSTDIV2_SHIFT |
div->refdiv << PLL_REFDIV_SHIFT));
/* waiting for pll lock */
while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
udelay(1);
return 0;
}
static void rkclk_init(struct rk3036_cru *cru)
{
u32 aclk_div;
u32 hclk_div;
u32 pclk_div;
/* pll enter slow-mode */
rk_clrsetreg(&cru->cru_mode_con,
GPLL_MODE_MASK << GPLL_MODE_SHIFT |
APLL_MODE_MASK << APLL_MODE_SHIFT,
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 core clock pll source and
* set up dependent divisors for PCLK/HCLK 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_CLK_PLL_SEL_SHIFT |
CORE_DIV_CON_MASK << CORE_DIV_CON_SHIFT,
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_ACLK_DIV_SHIFT |
CORE_PERI_DIV_MASK << CORE_PERI_DIV_SHIFT,
aclk_div << CORE_ACLK_DIV_SHIFT |
pclk_div << CORE_PERI_DIV_SHIFT);
/*
* select apll as cpu clock pll source and
* set up dependent divisors for PCLK/HCLK and ACLK clocks.
*/
aclk_div = APLL_HZ / CPU_ACLK_HZ - 1;
assert((aclk_div + 1) * CPU_ACLK_HZ == APLL_HZ && aclk_div < 0x1f);
pclk_div = APLL_HZ / CPU_PCLK_HZ - 1;
assert((pclk_div + 1) * CPU_PCLK_HZ == APLL_HZ && pclk_div < 0x7);
hclk_div = APLL_HZ / CPU_HCLK_HZ - 1;
assert((hclk_div + 1) * CPU_HCLK_HZ == APLL_HZ && hclk_div < 0x3);
rk_clrsetreg(&cru->cru_clksel_con[0],
CPU_CLK_PLL_SEL_MASK << CPU_CLK_PLL_SEL_SHIFT |
ACLK_CPU_DIV_MASK << ACLK_CPU_DIV_SHIFT,
CPU_CLK_PLL_SEL_APLL << CPU_CLK_PLL_SEL_SHIFT |
aclk_div << ACLK_CPU_DIV_SHIFT);
rk_clrsetreg(&cru->cru_clksel_con[1],
CPU_PCLK_DIV_MASK << CPU_PCLK_DIV_SHIFT |
CPU_HCLK_DIV_MASK << CPU_HCLK_DIV_SHIFT,
pclk_div << CPU_PCLK_DIV_SHIFT |
hclk_div << CPU_HCLK_DIV_SHIFT);
/*
* select gpll as peri clock pll 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 = log2(PERI_ACLK_HZ / PERI_HCLK_HZ);
assert((1 << hclk_div) * PERI_HCLK_HZ ==
PERI_ACLK_HZ && (pclk_div < 0x4));
pclk_div = log2(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_PLL_SEL_SHIFT |
PERI_PCLK_DIV_MASK << PERI_PCLK_DIV_SHIFT |
PERI_HCLK_DIV_MASK << PERI_HCLK_DIV_SHIFT |
PERI_ACLK_DIV_MASK << PERI_ACLK_DIV_SHIFT,
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 << GPLL_MODE_SHIFT |
APLL_MODE_MASK << APLL_MODE_SHIFT,
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 rk3036_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 rk3036_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 u8 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 >> shift) & mask) {
case GPLL_MODE_SLOW:
return OSC_HZ;
case GPLL_MODE_NORM:
/* normal mode */
con = readl(&pll->con0);
postdiv1 = (con >> PLL_POSTDIV1_SHIFT) & PLL_POSTDIV1_MASK;
fbdiv = (con >> PLL_FBDIV_SHIFT) & PLL_FBDIV_MASK;
con = readl(&pll->con1);
postdiv2 = (con >> PLL_POSTDIV2_SHIFT) & PLL_POSTDIV2_MASK;
refdiv = (con >> PLL_REFDIV_SHIFT) & PLL_REFDIV_MASK;
return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
case GPLL_MODE_DEEP:
default:
return 32768;
}
}
static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
enum periph_id periph)
{
uint src_rate;
uint div, mux;
u32 con;
switch (periph) {
case PERIPH_ID_EMMC:
con = readl(&cru->cru_clksel_con[12]);
mux = (con >> EMMC_PLL_SHIFT) & EMMC_PLL_MASK;
div = (con >> EMMC_DIV_SHIFT) & EMMC_DIV_MASK;
break;
case PERIPH_ID_SDCARD:
con = readl(&cru->cru_clksel_con[12]);
mux = (con >> MMC0_PLL_SHIFT) & MMC0_PLL_MASK;
div = (con >> MMC0_DIV_SHIFT) & MMC0_DIV_MASK;
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 rk3036_cru *cru, uint clk_general_rate,
enum periph_id periph, uint freq)
{
int src_clk_div;
int mux;
debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
/* mmc clock auto divide 2 in internal */
src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
if (src_clk_div > 0x7f) {
src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
mux = EMMC_SEL_24M;
} else {
mux = EMMC_SEL_GPLL;
}
switch (periph) {
case PERIPH_ID_EMMC:
rk_clrsetreg(&cru->cru_clksel_con[12],
EMMC_PLL_MASK << EMMC_PLL_SHIFT |
EMMC_DIV_MASK << EMMC_DIV_SHIFT,
mux << EMMC_PLL_SHIFT |
(src_clk_div - 1) << EMMC_DIV_SHIFT);
break;
case PERIPH_ID_SDCARD:
rk_clrsetreg(&cru->cru_clksel_con[11],
MMC0_PLL_MASK << MMC0_PLL_SHIFT |
MMC0_DIV_MASK << MMC0_DIV_SHIFT,
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 rk3036_clk_get_rate(struct udevice *dev)
{
struct rk3036_clk_plat *plat = dev_get_platdata(dev);
struct rk3036_clk_priv *priv = dev_get_priv(dev);
debug("%s\n", dev->name);
return rkclk_pll_get_rate(priv->cru, plat->clk_id);
}
static ulong rk3036_clk_set_rate(struct udevice *dev, ulong rate)
{
debug("%s\n", dev->name);
return 0;
}
ulong rk3036_set_periph_rate(struct udevice *dev, int periph, ulong rate)
{
struct rk3036_clk_priv *priv = dev_get_priv(dev);
ulong new_rate;
switch (periph) {
case PERIPH_ID_EMMC:
new_rate = rockchip_mmc_set_clk(priv->cru, clk_get_rate(dev),
periph, rate);
break;
default:
return -ENOENT;
}
return new_rate;
}
static struct clk_ops rk3036_clk_ops = {
.get_rate = rk3036_clk_get_rate,
.set_rate = rk3036_clk_set_rate,
.set_periph_rate = rk3036_set_periph_rate,
};
static int rk3036_clk_probe(struct udevice *dev)
{
struct rk3036_clk_plat *plat = dev_get_platdata(dev);
struct rk3036_clk_priv *priv = dev_get_priv(dev);
if (plat->clk_id != CLK_OSC) {
struct rk3036_clk_priv *parent_priv = dev_get_priv(dev->parent);
priv->cru = parent_priv->cru;
return 0;
}
priv->cru = (struct rk3036_cru *)dev_get_addr(dev);
rkclk_init(priv->cru);
return 0;
}
static const char *const clk_name[] = {
"osc",
"apll",
"dpll",
"cpll",
"gpll",
"mpll",
};
static int rk3036_clk_bind(struct udevice *dev)
{
struct rk3036_clk_plat *plat = dev_get_platdata(dev);
int pll, ret;
/* We only need to set up the root clock */
if (dev->of_offset == -1) {
plat->clk_id = CLK_OSC;
return 0;
}
/* Create devices for P main clocks */
for (pll = 1; pll < CLK_COUNT; pll++) {
struct udevice *child;
struct rk3036_clk_plat *cplat;
debug("%s %s\n", __func__, clk_name[pll]);
ret = device_bind_driver(dev, "clk_rk3036", clk_name[pll],
&child);
if (ret)
return ret;
cplat = dev_get_platdata(child);
cplat->clk_id = pll;
}
/* The reset driver does not have a device node, so bind it here */
ret = device_bind_driver(gd->dm_root, "rk3036_reset", "reset", &dev);
if (ret)
debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
return 0;
}
static const struct udevice_id rk3036_clk_ids[] = {
{ .compatible = "rockchip,rk3036-cru" },
{ }
};
U_BOOT_DRIVER(clk_rk3036) = {
.name = "clk_rk3036",
.id = UCLASS_CLK,
.of_match = rk3036_clk_ids,
.priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
.platdata_auto_alloc_size = sizeof(struct rk3036_clk_plat),
.ops = &rk3036_clk_ops,
.bind = rk3036_clk_bind,
.probe = rk3036_clk_probe,
};