linux/drivers/clk/imx/clk-pll14xx.c

444 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2017-2018 NXP.
*/
#include <linux/bits.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include "clk.h"
#define GNRL_CTL 0x0
#define DIV_CTL 0x4
#define LOCK_STATUS BIT(31)
#define LOCK_SEL_MASK BIT(29)
#define CLKE_MASK BIT(11)
#define RST_MASK BIT(9)
#define BYPASS_MASK BIT(4)
#define MDIV_SHIFT 12
#define MDIV_MASK GENMASK(21, 12)
#define PDIV_SHIFT 4
#define PDIV_MASK GENMASK(9, 4)
#define SDIV_SHIFT 0
#define SDIV_MASK GENMASK(2, 0)
#define KDIV_SHIFT 0
#define KDIV_MASK GENMASK(15, 0)
#define LOCK_TIMEOUT_US 10000
struct clk_pll14xx {
struct clk_hw hw;
void __iomem *base;
enum imx_pll14xx_type type;
const struct imx_pll14xx_rate_table *rate_table;
int rate_count;
};
#define to_clk_pll14xx(_hw) container_of(_hw, struct clk_pll14xx, hw)
static const struct imx_pll14xx_rate_table imx_pll1416x_tbl[] = {
PLL_1416X_RATE(1800000000U, 225, 3, 0),
PLL_1416X_RATE(1600000000U, 200, 3, 0),
PLL_1416X_RATE(1500000000U, 375, 3, 1),
PLL_1416X_RATE(1400000000U, 350, 3, 1),
PLL_1416X_RATE(1200000000U, 300, 3, 1),
PLL_1416X_RATE(1000000000U, 250, 3, 1),
PLL_1416X_RATE(800000000U, 200, 3, 1),
PLL_1416X_RATE(750000000U, 250, 2, 2),
PLL_1416X_RATE(700000000U, 350, 3, 2),
PLL_1416X_RATE(600000000U, 300, 3, 2),
};
static const struct imx_pll14xx_rate_table imx_pll1443x_tbl[] = {
PLL_1443X_RATE(1039500000U, 173, 2, 1, 16384),
PLL_1443X_RATE(650000000U, 325, 3, 2, 0),
PLL_1443X_RATE(594000000U, 198, 2, 2, 0),
PLL_1443X_RATE(519750000U, 173, 2, 2, 16384),
PLL_1443X_RATE(393216000U, 262, 2, 3, 9437),
PLL_1443X_RATE(361267200U, 361, 3, 3, 17511),
};
struct imx_pll14xx_clk imx_1443x_pll = {
.type = PLL_1443X,
.rate_table = imx_pll1443x_tbl,
.rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
};
EXPORT_SYMBOL_GPL(imx_1443x_pll);
struct imx_pll14xx_clk imx_1443x_dram_pll = {
.type = PLL_1443X,
.rate_table = imx_pll1443x_tbl,
.rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
.flags = CLK_GET_RATE_NOCACHE,
};
EXPORT_SYMBOL_GPL(imx_1443x_dram_pll);
struct imx_pll14xx_clk imx_1416x_pll = {
.type = PLL_1416X,
.rate_table = imx_pll1416x_tbl,
.rate_count = ARRAY_SIZE(imx_pll1416x_tbl),
};
EXPORT_SYMBOL_GPL(imx_1416x_pll);
static const struct imx_pll14xx_rate_table *imx_get_pll_settings(
struct clk_pll14xx *pll, unsigned long rate)
{
const struct imx_pll14xx_rate_table *rate_table = pll->rate_table;
int i;
for (i = 0; i < pll->rate_count; i++)
if (rate == rate_table[i].rate)
return &rate_table[i];
return NULL;
}
static long clk_pll14xx_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
const struct imx_pll14xx_rate_table *rate_table = pll->rate_table;
int i;
/* Assumming rate_table is in descending order */
for (i = 0; i < pll->rate_count; i++)
if (rate >= rate_table[i].rate)
return rate_table[i].rate;
/* return minimum supported value */
return rate_table[i - 1].rate;
}
static unsigned long clk_pll1416x_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
u32 mdiv, pdiv, sdiv, pll_div;
u64 fvco = parent_rate;
pll_div = readl_relaxed(pll->base + 4);
mdiv = (pll_div & MDIV_MASK) >> MDIV_SHIFT;
pdiv = (pll_div & PDIV_MASK) >> PDIV_SHIFT;
sdiv = (pll_div & SDIV_MASK) >> SDIV_SHIFT;
fvco *= mdiv;
do_div(fvco, pdiv << sdiv);
return fvco;
}
static unsigned long clk_pll1443x_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
u32 mdiv, pdiv, sdiv, pll_div_ctl0, pll_div_ctl1;
short int kdiv;
u64 fvco = parent_rate;
pll_div_ctl0 = readl_relaxed(pll->base + 4);
pll_div_ctl1 = readl_relaxed(pll->base + 8);
mdiv = (pll_div_ctl0 & MDIV_MASK) >> MDIV_SHIFT;
pdiv = (pll_div_ctl0 & PDIV_MASK) >> PDIV_SHIFT;
sdiv = (pll_div_ctl0 & SDIV_MASK) >> SDIV_SHIFT;
kdiv = pll_div_ctl1 & KDIV_MASK;
/* fvco = (m * 65536 + k) * Fin / (p * 65536) */
fvco *= (mdiv * 65536 + kdiv);
pdiv *= 65536;
do_div(fvco, pdiv << sdiv);
return fvco;
}
static inline bool clk_pll14xx_mp_change(const struct imx_pll14xx_rate_table *rate,
u32 pll_div)
{
u32 old_mdiv, old_pdiv;
old_mdiv = (pll_div & MDIV_MASK) >> MDIV_SHIFT;
old_pdiv = (pll_div & PDIV_MASK) >> PDIV_SHIFT;
return rate->mdiv != old_mdiv || rate->pdiv != old_pdiv;
}
static int clk_pll14xx_wait_lock(struct clk_pll14xx *pll)
{
u32 val;
return readl_poll_timeout(pll->base, val, val & LOCK_STATUS, 0,
LOCK_TIMEOUT_US);
}
static int clk_pll1416x_set_rate(struct clk_hw *hw, unsigned long drate,
unsigned long prate)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
const struct imx_pll14xx_rate_table *rate;
u32 tmp, div_val;
int ret;
rate = imx_get_pll_settings(pll, drate);
if (!rate) {
pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
drate, clk_hw_get_name(hw));
return -EINVAL;
}
tmp = readl_relaxed(pll->base + 4);
if (!clk_pll14xx_mp_change(rate, tmp)) {
tmp &= ~(SDIV_MASK) << SDIV_SHIFT;
tmp |= rate->sdiv << SDIV_SHIFT;
writel_relaxed(tmp, pll->base + 4);
return 0;
}
/* Bypass clock and set lock to pll output lock */
tmp = readl_relaxed(pll->base);
tmp |= LOCK_SEL_MASK;
writel_relaxed(tmp, pll->base);
/* Enable RST */
tmp &= ~RST_MASK;
writel_relaxed(tmp, pll->base);
/* Enable BYPASS */
tmp |= BYPASS_MASK;
writel(tmp, pll->base);
div_val = (rate->mdiv << MDIV_SHIFT) | (rate->pdiv << PDIV_SHIFT) |
(rate->sdiv << SDIV_SHIFT);
writel_relaxed(div_val, pll->base + 0x4);
/*
* According to SPEC, t3 - t2 need to be greater than
* 1us and 1/FREF, respectively.
* FREF is FIN / Prediv, the prediv is [1, 63], so choose
* 3us.
*/
udelay(3);
/* Disable RST */
tmp |= RST_MASK;
writel_relaxed(tmp, pll->base);
/* Wait Lock */
ret = clk_pll14xx_wait_lock(pll);
if (ret)
return ret;
/* Bypass */
tmp &= ~BYPASS_MASK;
writel_relaxed(tmp, pll->base);
return 0;
}
static int clk_pll1443x_set_rate(struct clk_hw *hw, unsigned long drate,
unsigned long prate)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
const struct imx_pll14xx_rate_table *rate;
u32 tmp, div_val;
int ret;
rate = imx_get_pll_settings(pll, drate);
if (!rate) {
pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
drate, clk_hw_get_name(hw));
return -EINVAL;
}
tmp = readl_relaxed(pll->base + 4);
if (!clk_pll14xx_mp_change(rate, tmp)) {
tmp &= ~(SDIV_MASK) << SDIV_SHIFT;
tmp |= rate->sdiv << SDIV_SHIFT;
writel_relaxed(tmp, pll->base + 4);
tmp = rate->kdiv << KDIV_SHIFT;
writel_relaxed(tmp, pll->base + 8);
return 0;
}
/* Enable RST */
tmp = readl_relaxed(pll->base);
tmp &= ~RST_MASK;
writel_relaxed(tmp, pll->base);
/* Enable BYPASS */
tmp |= BYPASS_MASK;
writel_relaxed(tmp, pll->base);
div_val = (rate->mdiv << MDIV_SHIFT) | (rate->pdiv << PDIV_SHIFT) |
(rate->sdiv << SDIV_SHIFT);
writel_relaxed(div_val, pll->base + 0x4);
writel_relaxed(rate->kdiv << KDIV_SHIFT, pll->base + 0x8);
/*
* According to SPEC, t3 - t2 need to be greater than
* 1us and 1/FREF, respectively.
* FREF is FIN / Prediv, the prediv is [1, 63], so choose
* 3us.
*/
udelay(3);
/* Disable RST */
tmp |= RST_MASK;
writel_relaxed(tmp, pll->base);
/* Wait Lock*/
ret = clk_pll14xx_wait_lock(pll);
if (ret)
return ret;
/* Bypass */
tmp &= ~BYPASS_MASK;
writel_relaxed(tmp, pll->base);
return 0;
}
static int clk_pll14xx_prepare(struct clk_hw *hw)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
u32 val;
int ret;
/*
* RESETB = 1 from 0, PLL starts its normal
* operation after lock time
*/
val = readl_relaxed(pll->base + GNRL_CTL);
if (val & RST_MASK)
return 0;
val |= BYPASS_MASK;
writel_relaxed(val, pll->base + GNRL_CTL);
val |= RST_MASK;
writel_relaxed(val, pll->base + GNRL_CTL);
ret = clk_pll14xx_wait_lock(pll);
if (ret)
return ret;
val &= ~BYPASS_MASK;
writel_relaxed(val, pll->base + GNRL_CTL);
return 0;
}
static int clk_pll14xx_is_prepared(struct clk_hw *hw)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
u32 val;
val = readl_relaxed(pll->base + GNRL_CTL);
return (val & RST_MASK) ? 1 : 0;
}
static void clk_pll14xx_unprepare(struct clk_hw *hw)
{
struct clk_pll14xx *pll = to_clk_pll14xx(hw);
u32 val;
/*
* Set RST to 0, power down mode is enabled and
* every digital block is reset
*/
val = readl_relaxed(pll->base + GNRL_CTL);
val &= ~RST_MASK;
writel_relaxed(val, pll->base + GNRL_CTL);
}
static const struct clk_ops clk_pll1416x_ops = {
.prepare = clk_pll14xx_prepare,
.unprepare = clk_pll14xx_unprepare,
.is_prepared = clk_pll14xx_is_prepared,
.recalc_rate = clk_pll1416x_recalc_rate,
.round_rate = clk_pll14xx_round_rate,
.set_rate = clk_pll1416x_set_rate,
};
static const struct clk_ops clk_pll1416x_min_ops = {
.recalc_rate = clk_pll1416x_recalc_rate,
};
static const struct clk_ops clk_pll1443x_ops = {
.prepare = clk_pll14xx_prepare,
.unprepare = clk_pll14xx_unprepare,
.is_prepared = clk_pll14xx_is_prepared,
.recalc_rate = clk_pll1443x_recalc_rate,
.round_rate = clk_pll14xx_round_rate,
.set_rate = clk_pll1443x_set_rate,
};
struct clk_hw *imx_dev_clk_hw_pll14xx(struct device *dev, const char *name,
const char *parent_name, void __iomem *base,
const struct imx_pll14xx_clk *pll_clk)
{
struct clk_pll14xx *pll;
struct clk_hw *hw;
struct clk_init_data init;
int ret;
u32 val;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
init.name = name;
init.flags = pll_clk->flags;
init.parent_names = &parent_name;
init.num_parents = 1;
switch (pll_clk->type) {
case PLL_1416X:
if (!pll_clk->rate_table)
init.ops = &clk_pll1416x_min_ops;
else
init.ops = &clk_pll1416x_ops;
break;
case PLL_1443X:
init.ops = &clk_pll1443x_ops;
break;
default:
pr_err("%s: Unknown pll type for pll clk %s\n",
__func__, name);
kfree(pll);
return ERR_PTR(-EINVAL);
};
pll->base = base;
pll->hw.init = &init;
pll->type = pll_clk->type;
pll->rate_table = pll_clk->rate_table;
pll->rate_count = pll_clk->rate_count;
val = readl_relaxed(pll->base + GNRL_CTL);
val &= ~BYPASS_MASK;
writel_relaxed(val, pll->base + GNRL_CTL);
hw = &pll->hw;
ret = clk_hw_register(dev, hw);
if (ret) {
pr_err("%s: failed to register pll %s %d\n",
__func__, name, ret);
kfree(pll);
return ERR_PTR(ret);
}
return hw;
}
EXPORT_SYMBOL_GPL(imx_dev_clk_hw_pll14xx);