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linux/drivers/clk/st/clkgen-pll.c
Lee Jones 6ca59e6e1f clk: st: clkgen-pll: Detect critical clocks 
Utilise the new Critical Clock infrastructure to mark clocks which
much not be disabled as CRITICAL.

Clocks are marked as CRITICAL using clk flags.  This patch also
ensures flags are peculated through the framework in the correct
manner.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2016-06-30 12:17:11 -07:00

1225 lines
30 KiB
C
Raw Blame History

/*
* Copyright (C) 2014 STMicroelectronics (R&D) Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
/*
* Authors:
* Stephen Gallimore <stephen.gallimore@st.com>,
* Pankaj Dev <pankaj.dev@st.com>.
*/
#include <linux/slab.h>
#include <linux/of_address.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/iopoll.h>
#include "clkgen.h"
static DEFINE_SPINLOCK(clkgena_c32_odf_lock);
DEFINE_SPINLOCK(clkgen_a9_lock);
/*
* Common PLL configuration register bits for PLL800 and PLL1600 C65
*/
#define C65_MDIV_PLL800_MASK (0xff)
#define C65_MDIV_PLL1600_MASK (0x7)
#define C65_NDIV_MASK (0xff)
#define C65_PDIV_MASK (0x7)
/*
* PLL configuration register bits for PLL3200 C32
*/
#define C32_NDIV_MASK (0xff)
#define C32_IDF_MASK (0x7)
#define C32_ODF_MASK (0x3f)
#define C32_LDF_MASK (0x7f)
#define C32_CP_MASK (0x1f)
#define C32_MAX_ODFS (4)
/*
* PLL configuration register bits for PLL4600 C28
*/
#define C28_NDIV_MASK (0xff)
#define C28_IDF_MASK (0x7)
#define C28_ODF_MASK (0x3f)
struct clkgen_pll_data {
struct clkgen_field pdn_status;
struct clkgen_field pdn_ctrl;
struct clkgen_field locked_status;
struct clkgen_field mdiv;
struct clkgen_field ndiv;
struct clkgen_field pdiv;
struct clkgen_field idf;
struct clkgen_field ldf;
struct clkgen_field cp;
unsigned int num_odfs;
struct clkgen_field odf[C32_MAX_ODFS];
struct clkgen_field odf_gate[C32_MAX_ODFS];
bool switch2pll_en;
struct clkgen_field switch2pll;
spinlock_t *lock;
const struct clk_ops *ops;
};
static const struct clk_ops st_pll1600c65_ops;
static const struct clk_ops st_pll800c65_ops;
static const struct clk_ops stm_pll3200c32_ops;
static const struct clk_ops stm_pll3200c32_a9_ops;
static const struct clk_ops st_pll1200c32_ops;
static const struct clk_ops stm_pll4600c28_ops;
static const struct clkgen_pll_data st_pll1600c65_ax = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 19),
.pdn_ctrl = CLKGEN_FIELD(0x10, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x0, 0x1, 31),
.mdiv = CLKGEN_FIELD(0x0, C65_MDIV_PLL1600_MASK, 0),
.ndiv = CLKGEN_FIELD(0x0, C65_NDIV_MASK, 8),
.ops = &st_pll1600c65_ops
};
static const struct clkgen_pll_data st_pll800c65_ax = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 19),
.pdn_ctrl = CLKGEN_FIELD(0xC, 0x1, 1),
.locked_status = CLKGEN_FIELD(0x0, 0x1, 31),
.mdiv = CLKGEN_FIELD(0x0, C65_MDIV_PLL800_MASK, 0),
.ndiv = CLKGEN_FIELD(0x0, C65_NDIV_MASK, 8),
.pdiv = CLKGEN_FIELD(0x0, C65_PDIV_MASK, 16),
.ops = &st_pll800c65_ops
};
static const struct clkgen_pll_data st_pll3200c32_a1x_0 = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 31),
.pdn_ctrl = CLKGEN_FIELD(0x18, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x4, 0x1, 31),
.ndiv = CLKGEN_FIELD(0x0, C32_NDIV_MASK, 0x0),
.idf = CLKGEN_FIELD(0x4, C32_IDF_MASK, 0x0),
.num_odfs = 4,
.odf = { CLKGEN_FIELD(0x54, C32_ODF_MASK, 4),
CLKGEN_FIELD(0x54, C32_ODF_MASK, 10),
CLKGEN_FIELD(0x54, C32_ODF_MASK, 16),
CLKGEN_FIELD(0x54, C32_ODF_MASK, 22) },
.odf_gate = { CLKGEN_FIELD(0x54, 0x1, 0),
CLKGEN_FIELD(0x54, 0x1, 1),
CLKGEN_FIELD(0x54, 0x1, 2),
CLKGEN_FIELD(0x54, 0x1, 3) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_a1x_1 = {
.pdn_status = CLKGEN_FIELD(0xC, 0x1, 31),
.pdn_ctrl = CLKGEN_FIELD(0x18, 0x1, 1),
.locked_status = CLKGEN_FIELD(0x10, 0x1, 31),
.ndiv = CLKGEN_FIELD(0xC, C32_NDIV_MASK, 0x0),
.idf = CLKGEN_FIELD(0x10, C32_IDF_MASK, 0x0),
.num_odfs = 4,
.odf = { CLKGEN_FIELD(0x58, C32_ODF_MASK, 4),
CLKGEN_FIELD(0x58, C32_ODF_MASK, 10),
CLKGEN_FIELD(0x58, C32_ODF_MASK, 16),
CLKGEN_FIELD(0x58, C32_ODF_MASK, 22) },
.odf_gate = { CLKGEN_FIELD(0x58, 0x1, 0),
CLKGEN_FIELD(0x58, 0x1, 1),
CLKGEN_FIELD(0x58, 0x1, 2),
CLKGEN_FIELD(0x58, 0x1, 3) },
.ops = &stm_pll3200c32_ops,
};
/* 415 specific */
static const struct clkgen_pll_data st_pll3200c32_a9_415 = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x0, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x6C, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x0, C32_NDIV_MASK, 9),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 22),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x0, C32_ODF_MASK, 3) },
.odf_gate = { CLKGEN_FIELD(0x0, 0x1, 28) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_ddr_415 = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x0, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x100, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x8, C32_NDIV_MASK, 0),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 25),
.num_odfs = 2,
.odf = { CLKGEN_FIELD(0x8, C32_ODF_MASK, 8),
CLKGEN_FIELD(0x8, C32_ODF_MASK, 14) },
.odf_gate = { CLKGEN_FIELD(0x4, 0x1, 28),
CLKGEN_FIELD(0x4, 0x1, 29) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll1200c32_gpu_415 = {
.pdn_status = CLKGEN_FIELD(0x4, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x4, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x168, 0x1, 0),
.ldf = CLKGEN_FIELD(0x0, C32_LDF_MASK, 3),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 0),
.num_odfs = 0,
.odf = { CLKGEN_FIELD(0x0, C32_ODF_MASK, 10) },
.ops = &st_pll1200c32_ops,
};
/* 416 specific */
static const struct clkgen_pll_data st_pll3200c32_a9_416 = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x0, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x6C, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x8, C32_NDIV_MASK, 0),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 25),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x8, C32_ODF_MASK, 8) },
.odf_gate = { CLKGEN_FIELD(0x4, 0x1, 28) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_ddr_416 = {
.pdn_status = CLKGEN_FIELD(0x0, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x0, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x10C, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x8, C32_NDIV_MASK, 0),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 25),
.num_odfs = 2,
.odf = { CLKGEN_FIELD(0x8, C32_ODF_MASK, 8),
CLKGEN_FIELD(0x8, C32_ODF_MASK, 14) },
.odf_gate = { CLKGEN_FIELD(0x4, 0x1, 28),
CLKGEN_FIELD(0x4, 0x1, 29) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll1200c32_gpu_416 = {
.pdn_status = CLKGEN_FIELD(0x8E4, 0x1, 3),
.pdn_ctrl = CLKGEN_FIELD(0x8E4, 0x1, 3),
.locked_status = CLKGEN_FIELD(0x90C, 0x1, 0),
.ldf = CLKGEN_FIELD(0x0, C32_LDF_MASK, 3),
.idf = CLKGEN_FIELD(0x0, C32_IDF_MASK, 0),
.num_odfs = 0,
.odf = { CLKGEN_FIELD(0x0, C32_ODF_MASK, 10) },
.ops = &st_pll1200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_407_a0 = {
/* 407 A0 */
.pdn_status = CLKGEN_FIELD(0x2a0, 0x1, 8),
.pdn_ctrl = CLKGEN_FIELD(0x2a0, 0x1, 8),
.locked_status = CLKGEN_FIELD(0x2a0, 0x1, 24),
.ndiv = CLKGEN_FIELD(0x2a4, C32_NDIV_MASK, 16),
.idf = CLKGEN_FIELD(0x2a4, C32_IDF_MASK, 0x0),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x2b4, C32_ODF_MASK, 0) },
.odf_gate = { CLKGEN_FIELD(0x2b4, 0x1, 6) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_cx_0 = {
/* 407 C0 PLL0 */
.pdn_status = CLKGEN_FIELD(0x2a0, 0x1, 8),
.pdn_ctrl = CLKGEN_FIELD(0x2a0, 0x1, 8),
.locked_status = CLKGEN_FIELD(0x2a0, 0x1, 24),
.ndiv = CLKGEN_FIELD(0x2a4, C32_NDIV_MASK, 16),
.idf = CLKGEN_FIELD(0x2a4, C32_IDF_MASK, 0x0),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x2b4, C32_ODF_MASK, 0) },
.odf_gate = { CLKGEN_FIELD(0x2b4, 0x1, 6) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_cx_1 = {
/* 407 C0 PLL1 */
.pdn_status = CLKGEN_FIELD(0x2c8, 0x1, 8),
.pdn_ctrl = CLKGEN_FIELD(0x2c8, 0x1, 8),
.locked_status = CLKGEN_FIELD(0x2c8, 0x1, 24),
.ndiv = CLKGEN_FIELD(0x2cc, C32_NDIV_MASK, 16),
.idf = CLKGEN_FIELD(0x2cc, C32_IDF_MASK, 0x0),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x2dc, C32_ODF_MASK, 0) },
.odf_gate = { CLKGEN_FIELD(0x2dc, 0x1, 6) },
.ops = &stm_pll3200c32_ops,
};
static const struct clkgen_pll_data st_pll3200c32_407_a9 = {
/* 407 A9 */
.pdn_status = CLKGEN_FIELD(0x1a8, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x1a8, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x87c, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x1b0, C32_NDIV_MASK, 0),
.idf = CLKGEN_FIELD(0x1a8, C32_IDF_MASK, 25),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x1b0, C32_ODF_MASK, 8) },
.odf_gate = { CLKGEN_FIELD(0x1ac, 0x1, 28) },
.switch2pll_en = true,
.cp = CLKGEN_FIELD(0x1a8, C32_CP_MASK, 1),
.switch2pll = CLKGEN_FIELD(0x1a4, 0x1, 1),
.lock = &clkgen_a9_lock,
.ops = &stm_pll3200c32_a9_ops,
};
static struct clkgen_pll_data st_pll4600c28_418_a9 = {
/* 418 A9 */
.pdn_status = CLKGEN_FIELD(0x1a8, 0x1, 0),
.pdn_ctrl = CLKGEN_FIELD(0x1a8, 0x1, 0),
.locked_status = CLKGEN_FIELD(0x87c, 0x1, 0),
.ndiv = CLKGEN_FIELD(0x1b0, C28_NDIV_MASK, 0),
.idf = CLKGEN_FIELD(0x1a8, C28_IDF_MASK, 25),
.num_odfs = 1,
.odf = { CLKGEN_FIELD(0x1b0, C28_ODF_MASK, 8) },
.odf_gate = { CLKGEN_FIELD(0x1ac, 0x1, 28) },
.switch2pll_en = true,
.switch2pll = CLKGEN_FIELD(0x1a4, 0x1, 1),
.lock = &clkgen_a9_lock,
.ops = &stm_pll4600c28_ops,
};
/**
* DOC: Clock Generated by PLL, rate set and enabled by bootloader
*
* Traits of this clock:
* prepare - clk_(un)prepare only ensures parent is (un)prepared
* enable - clk_enable/disable only ensures parent is enabled
* rate - rate is fixed. No clk_set_rate support
* parent - fixed parent. No clk_set_parent support
*/
/**
* PLL clock that is integrated in the ClockGenA instances on the STiH415
* and STiH416.
*
* @hw: handle between common and hardware-specific interfaces.
* @type: PLL instance type.
* @regs_base: base of the PLL configuration register(s).
*
*/
struct clkgen_pll {
struct clk_hw hw;
struct clkgen_pll_data *data;
void __iomem *regs_base;
spinlock_t *lock;
u32 ndiv;
u32 idf;
u32 odf;
u32 cp;
};
#define to_clkgen_pll(_hw) container_of(_hw, struct clkgen_pll, hw)
struct stm_pll {
unsigned long mdiv;
unsigned long ndiv;
unsigned long pdiv;
unsigned long odf;
unsigned long idf;
unsigned long ldf;
unsigned long cp;
};
static int clkgen_pll_is_locked(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
u32 locked = CLKGEN_READ(pll, locked_status);
return !!locked;
}
static int clkgen_pll_is_enabled(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
u32 poweroff = CLKGEN_READ(pll, pdn_status);
return !poweroff;
}
static int __clkgen_pll_enable(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
void __iomem *base = pll->regs_base;
struct clkgen_field *field = &pll->data->locked_status;
int ret = 0;
u32 reg;
if (clkgen_pll_is_enabled(hw))
return 0;
CLKGEN_WRITE(pll, pdn_ctrl, 0);
ret = readl_relaxed_poll_timeout(base + field->offset, reg,
!!((reg >> field->shift) & field->mask), 0, 10000);
if (!ret) {
if (pll->data->switch2pll_en)
CLKGEN_WRITE(pll, switch2pll, 0);
pr_debug("%s:%s enabled\n", __clk_get_name(hw->clk), __func__);
}
return ret;
}
static int clkgen_pll_enable(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long flags = 0;
int ret = 0;
if (pll->lock)
spin_lock_irqsave(pll->lock, flags);
ret = __clkgen_pll_enable(hw);
if (pll->lock)
spin_unlock_irqrestore(pll->lock, flags);
return ret;
}
static void __clkgen_pll_disable(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
if (!clkgen_pll_is_enabled(hw))
return;
if (pll->data->switch2pll_en)
CLKGEN_WRITE(pll, switch2pll, 1);
CLKGEN_WRITE(pll, pdn_ctrl, 1);
pr_debug("%s:%s disabled\n", __clk_get_name(hw->clk), __func__);
}
static void clkgen_pll_disable(struct clk_hw *hw)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long flags = 0;
if (pll->lock)
spin_lock_irqsave(pll->lock, flags);
__clkgen_pll_disable(hw);
if (pll->lock)
spin_unlock_irqrestore(pll->lock, flags);
}
static unsigned long recalc_stm_pll800c65(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long mdiv, ndiv, pdiv;
unsigned long rate;
uint64_t res;
if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
return 0;
pdiv = CLKGEN_READ(pll, pdiv);
mdiv = CLKGEN_READ(pll, mdiv);
ndiv = CLKGEN_READ(pll, ndiv);
if (!mdiv)
mdiv++; /* mdiv=0 or 1 => MDIV=1 */
res = (uint64_t)2 * (uint64_t)parent_rate * (uint64_t)ndiv;
rate = (unsigned long)div64_u64(res, mdiv * (1 << pdiv));
pr_debug("%s:%s rate %lu\n", clk_hw_get_name(hw), __func__, rate);
return rate;
}
static unsigned long recalc_stm_pll1600c65(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long mdiv, ndiv;
unsigned long rate;
if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
return 0;
mdiv = CLKGEN_READ(pll, mdiv);
ndiv = CLKGEN_READ(pll, ndiv);
if (!mdiv)
mdiv = 1;
/* Note: input is divided by 1000 to avoid overflow */
rate = ((2 * (parent_rate / 1000) * ndiv) / mdiv) * 1000;
pr_debug("%s:%s rate %lu\n", clk_hw_get_name(hw), __func__, rate);
return rate;
}
static int clk_pll3200c32_get_params(unsigned long input, unsigned long output,
struct stm_pll *pll)
{
unsigned long i, n;
unsigned long deviation = ~0;
unsigned long new_freq;
long new_deviation;
/* Charge pump table: highest ndiv value for cp=6 to 25 */
static const unsigned char cp_table[] = {
48, 56, 64, 72, 80, 88, 96, 104, 112, 120,
128, 136, 144, 152, 160, 168, 176, 184, 192
};
/* Output clock range: 800Mhz to 1600Mhz */
if (output < 800000000 || output > 1600000000)
return -EINVAL;
input /= 1000;
output /= 1000;
for (i = 1; i <= 7 && deviation; i++) {
n = i * output / (2 * input);
/* Checks */
if (n < 8)
continue;
if (n > 200)
break;
new_freq = (input * 2 * n) / i;
new_deviation = abs(new_freq - output);
if (!new_deviation || new_deviation < deviation) {
pll->idf = i;
pll->ndiv = n;
deviation = new_deviation;
}
}
if (deviation == ~0) /* No solution found */
return -EINVAL;
/* Computing recommended charge pump value */
for (pll->cp = 6; pll->ndiv > cp_table[pll->cp-6]; (pll->cp)++)
;
return 0;
}
static int clk_pll3200c32_get_rate(unsigned long input, struct stm_pll *pll,
unsigned long *rate)
{
if (!pll->idf)
pll->idf = 1;
*rate = ((2 * (input / 1000) * pll->ndiv) / pll->idf) * 1000;
return 0;
}
static unsigned long recalc_stm_pll3200c32(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long ndiv, idf;
unsigned long rate = 0;
if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
return 0;
ndiv = CLKGEN_READ(pll, ndiv);
idf = CLKGEN_READ(pll, idf);
if (idf)
/* Note: input is divided to avoid overflow */
rate = ((2 * (parent_rate/1000) * ndiv) / idf) * 1000;
pr_debug("%s:%s rate %lu\n", clk_hw_get_name(hw), __func__, rate);
return rate;
}
static long round_rate_stm_pll3200c32(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct stm_pll params;
if (!clk_pll3200c32_get_params(*prate, rate, &params))
clk_pll3200c32_get_rate(*prate, &params, &rate);
else {
pr_debug("%s: %s rate %ld Invalid\n", __func__,
__clk_get_name(hw->clk), rate);
return 0;
}
pr_debug("%s: %s new rate %ld [ndiv=%u] [idf=%u]\n",
__func__, __clk_get_name(hw->clk),
rate, (unsigned int)params.ndiv,
(unsigned int)params.idf);
return rate;
}
static int set_rate_stm_pll3200c32(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
struct stm_pll params;
long hwrate = 0;
unsigned long flags = 0;
if (!rate || !parent_rate)
return -EINVAL;
if (!clk_pll3200c32_get_params(parent_rate, rate, &params))
clk_pll3200c32_get_rate(parent_rate, &params, &hwrate);
pr_debug("%s: %s new rate %ld [ndiv=0x%x] [idf=0x%x]\n",
__func__, __clk_get_name(hw->clk),
hwrate, (unsigned int)params.ndiv,
(unsigned int)params.idf);
if (!hwrate)
return -EINVAL;
pll->ndiv = params.ndiv;
pll->idf = params.idf;
pll->cp = params.cp;
__clkgen_pll_disable(hw);
if (pll->lock)
spin_lock_irqsave(pll->lock, flags);
CLKGEN_WRITE(pll, ndiv, pll->ndiv);
CLKGEN_WRITE(pll, idf, pll->idf);
CLKGEN_WRITE(pll, cp, pll->cp);
if (pll->lock)
spin_unlock_irqrestore(pll->lock, flags);
__clkgen_pll_enable(hw);
return 0;
}
static unsigned long recalc_stm_pll1200c32(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
unsigned long odf, ldf, idf;
unsigned long rate;
if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
return 0;
odf = CLKGEN_READ(pll, odf[0]);
ldf = CLKGEN_READ(pll, ldf);
idf = CLKGEN_READ(pll, idf);
if (!idf) /* idf==0 means 1 */
idf = 1;
if (!odf) /* odf==0 means 1 */
odf = 1;
/* Note: input is divided by 1000 to avoid overflow */
rate = (((parent_rate / 1000) * ldf) / (odf * idf)) * 1000;
pr_debug("%s:%s rate %lu\n", clk_hw_get_name(hw), __func__, rate);
return rate;
}
/* PLL output structure
* FVCO >> /2 >> FVCOBY2 (no output)
* |> Divider (ODF) >> PHI
*
* FVCOby2 output = (input * 2 * NDIV) / IDF (assuming FRAC_CONTROL==L)
*
* Rules:
* 4Mhz <= INFF input <= 350Mhz
* 4Mhz <= INFIN (INFF / IDF) <= 50Mhz
* 19.05Mhz <= FVCOby2 output (PHI w ODF=1) <= 3000Mhz
* 1 <= i (register/dec value for IDF) <= 7
* 8 <= n (register/dec value for NDIV) <= 246
*/
static int clk_pll4600c28_get_params(unsigned long input, unsigned long output,
struct stm_pll *pll)
{
unsigned long i, infin, n;
unsigned long deviation = ~0;
unsigned long new_freq, new_deviation;
/* Output clock range: 19Mhz to 3000Mhz */
if (output < 19000000 || output > 3000000000u)
return -EINVAL;
/* For better jitter, IDF should be smallest and NDIV must be maximum */
for (i = 1; i <= 7 && deviation; i++) {
/* INFIN checks */
infin = input / i;
if (infin < 4000000 || infin > 50000000)
continue; /* Invalid case */
n = output / (infin * 2);
if (n < 8 || n > 246)
continue; /* Invalid case */
if (n < 246)
n++; /* To work around 'y' when n=x.y */
for (; n >= 8 && deviation; n--) {
new_freq = infin * 2 * n;
if (new_freq < output)
break; /* Optimization: shorting loop */
new_deviation = new_freq - output;
if (!new_deviation || new_deviation < deviation) {
pll->idf = i;
pll->ndiv = n;
deviation = new_deviation;
}
}
}
if (deviation == ~0) /* No solution found */
return -EINVAL;
return 0;
}
static int clk_pll4600c28_get_rate(unsigned long input, struct stm_pll *pll,
unsigned long *rate)
{
if (!pll->idf)
pll->idf = 1;
*rate = (input / pll->idf) * 2 * pll->ndiv;
return 0;
}
static unsigned long recalc_stm_pll4600c28(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
struct stm_pll params;
unsigned long rate;
if (!clkgen_pll_is_enabled(hw) || !clkgen_pll_is_locked(hw))
return 0;
params.ndiv = CLKGEN_READ(pll, ndiv);
params.idf = CLKGEN_READ(pll, idf);
clk_pll4600c28_get_rate(parent_rate, &params, &rate);
pr_debug("%s:%s rate %lu\n", __clk_get_name(hw->clk), __func__, rate);
return rate;
}
static long round_rate_stm_pll4600c28(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
struct stm_pll params;
if (!clk_pll4600c28_get_params(*prate, rate, &params)) {
clk_pll4600c28_get_rate(*prate, &params, &rate);
} else {
pr_debug("%s: %s rate %ld Invalid\n", __func__,
__clk_get_name(hw->clk), rate);
return 0;
}
pr_debug("%s: %s new rate %ld [ndiv=%u] [idf=%u]\n",
__func__, __clk_get_name(hw->clk),
rate, (unsigned int)params.ndiv,
(unsigned int)params.idf);
return rate;
}
static int set_rate_stm_pll4600c28(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clkgen_pll *pll = to_clkgen_pll(hw);
struct stm_pll params;
long hwrate;
unsigned long flags = 0;
if (!rate || !parent_rate)
return -EINVAL;
if (!clk_pll4600c28_get_params(parent_rate, rate, &params)) {
clk_pll4600c28_get_rate(parent_rate, &params, &hwrate);
} else {
pr_debug("%s: %s rate %ld Invalid\n", __func__,
__clk_get_name(hw->clk), rate);
return -EINVAL;
}
pr_debug("%s: %s new rate %ld [ndiv=0x%x] [idf=0x%x]\n",
__func__, __clk_get_name(hw->clk),
hwrate, (unsigned int)params.ndiv,
(unsigned int)params.idf);
if (!hwrate)
return -EINVAL;
pll->ndiv = params.ndiv;
pll->idf = params.idf;
__clkgen_pll_disable(hw);
if (pll->lock)
spin_lock_irqsave(pll->lock, flags);
CLKGEN_WRITE(pll, ndiv, pll->ndiv);
CLKGEN_WRITE(pll, idf, pll->idf);
if (pll->lock)
spin_unlock_irqrestore(pll->lock, flags);
__clkgen_pll_enable(hw);
return 0;
}
static const struct clk_ops st_pll1600c65_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll1600c65,
};
static const struct clk_ops st_pll800c65_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll800c65,
};
static const struct clk_ops stm_pll3200c32_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll3200c32,
};
static const struct clk_ops stm_pll3200c32_a9_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll3200c32,
.round_rate = round_rate_stm_pll3200c32,
.set_rate = set_rate_stm_pll3200c32,
};
static const struct clk_ops st_pll1200c32_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll1200c32,
};
static const struct clk_ops stm_pll4600c28_ops = {
.enable = clkgen_pll_enable,
.disable = clkgen_pll_disable,
.is_enabled = clkgen_pll_is_enabled,
.recalc_rate = recalc_stm_pll4600c28,
.round_rate = round_rate_stm_pll4600c28,
.set_rate = set_rate_stm_pll4600c28,
};
static struct clk * __init clkgen_pll_register(const char *parent_name,
struct clkgen_pll_data *pll_data,
void __iomem *reg, unsigned long pll_flags,
const char *clk_name, spinlock_t *lock)
{
struct clkgen_pll *pll;
struct clk *clk;
struct clk_init_data init;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
init.name = clk_name;
init.ops = pll_data->ops;
init.flags = pll_flags | CLK_IS_BASIC | CLK_GET_RATE_NOCACHE;
init.parent_names = &parent_name;
init.num_parents = 1;
pll->data = pll_data;
pll->regs_base = reg;
pll->hw.init = &init;
pll->lock = lock;
clk = clk_register(NULL, &pll->hw);
if (IS_ERR(clk)) {
kfree(pll);
return clk;
}
pr_debug("%s: parent %s rate %lu\n",
__clk_get_name(clk),
__clk_get_name(clk_get_parent(clk)),
clk_get_rate(clk));
return clk;
}
static struct clk * __init clkgen_c65_lsdiv_register(const char *parent_name,
const char *clk_name)
{
struct clk *clk;
clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0, 1, 2);
if (IS_ERR(clk))
return clk;
pr_debug("%s: parent %s rate %lu\n",
__clk_get_name(clk),
__clk_get_name(clk_get_parent(clk)),
clk_get_rate(clk));
return clk;
}
static void __iomem * __init clkgen_get_register_base(
struct device_node *np)
{
struct device_node *pnode;
void __iomem *reg = NULL;
pnode = of_get_parent(np);
if (!pnode)
return NULL;
reg = of_iomap(pnode, 0);
of_node_put(pnode);
return reg;
}
#define CLKGENAx_PLL0_OFFSET 0x0
#define CLKGENAx_PLL1_OFFSET 0x4
static void __init clkgena_c65_pll_setup(struct device_node *np)
{
const int num_pll_outputs = 3;
struct clk_onecell_data *clk_data;
const char *parent_name;
void __iomem *reg;
const char *clk_name;
parent_name = of_clk_get_parent_name(np, 0);
if (!parent_name)
return;
reg = clkgen_get_register_base(np);
if (!reg)
return;
clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
if (!clk_data)
return;
clk_data->clk_num = num_pll_outputs;
clk_data->clks = kzalloc(clk_data->clk_num * sizeof(struct clk *),
GFP_KERNEL);
if (!clk_data->clks)
goto err;
if (of_property_read_string_index(np, "clock-output-names",
0, &clk_name))
goto err;
/*
* PLL0 HS (high speed) output
*/
clk_data->clks[0] = clkgen_pll_register(parent_name,
(struct clkgen_pll_data *) &st_pll1600c65_ax,
reg + CLKGENAx_PLL0_OFFSET, 0, clk_name, NULL);
if (IS_ERR(clk_data->clks[0]))
goto err;
if (of_property_read_string_index(np, "clock-output-names",
1, &clk_name))
goto err;
/*
* PLL0 LS (low speed) output, which is a fixed divide by 2 of the
* high speed output.
*/
clk_data->clks[1] = clkgen_c65_lsdiv_register(__clk_get_name
(clk_data->clks[0]),
clk_name);
if (IS_ERR(clk_data->clks[1]))
goto err;
if (of_property_read_string_index(np, "clock-output-names",
2, &clk_name))
goto err;
/*
* PLL1 output
*/
clk_data->clks[2] = clkgen_pll_register(parent_name,
(struct clkgen_pll_data *) &st_pll800c65_ax,
reg + CLKGENAx_PLL1_OFFSET, 0, clk_name, NULL);
if (IS_ERR(clk_data->clks[2]))
goto err;
of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
return;
err:
kfree(clk_data->clks);
kfree(clk_data);
}
CLK_OF_DECLARE(clkgena_c65_plls,
"st,clkgena-plls-c65", clkgena_c65_pll_setup);
static struct clk * __init clkgen_odf_register(const char *parent_name,
void __iomem *reg,
struct clkgen_pll_data *pll_data,
unsigned long pll_flags, int odf,
spinlock_t *odf_lock,
const char *odf_name)
{
struct clk *clk;
unsigned long flags;
struct clk_gate *gate;
struct clk_divider *div;
flags = pll_flags | CLK_GET_RATE_NOCACHE | CLK_SET_RATE_PARENT;
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate)
return ERR_PTR(-ENOMEM);
gate->flags = CLK_GATE_SET_TO_DISABLE;
gate->reg = reg + pll_data->odf_gate[odf].offset;
gate->bit_idx = pll_data->odf_gate[odf].shift;
gate->lock = odf_lock;
div = kzalloc(sizeof(*div), GFP_KERNEL);
if (!div) {
kfree(gate);
return ERR_PTR(-ENOMEM);
}
div->flags = CLK_DIVIDER_ONE_BASED | CLK_DIVIDER_ALLOW_ZERO;
div->reg = reg + pll_data->odf[odf].offset;
div->shift = pll_data->odf[odf].shift;
div->width = fls(pll_data->odf[odf].mask);
div->lock = odf_lock;
clk = clk_register_composite(NULL, odf_name, &parent_name, 1,
NULL, NULL,
&div->hw, &clk_divider_ops,
&gate->hw, &clk_gate_ops,
flags);
if (IS_ERR(clk))
return clk;
pr_debug("%s: parent %s rate %lu\n",
__clk_get_name(clk),
__clk_get_name(clk_get_parent(clk)),
clk_get_rate(clk));
return clk;
}
static const struct of_device_id c32_pll_of_match[] = {
{
.compatible = "st,plls-c32-a1x-0",
.data = &st_pll3200c32_a1x_0,
},
{
.compatible = "st,plls-c32-a1x-1",
.data = &st_pll3200c32_a1x_1,
},
{
.compatible = "st,stih415-plls-c32-a9",
.data = &st_pll3200c32_a9_415,
},
{
.compatible = "st,stih415-plls-c32-ddr",
.data = &st_pll3200c32_ddr_415,
},
{
.compatible = "st,stih416-plls-c32-a9",
.data = &st_pll3200c32_a9_416,
},
{
.compatible = "st,stih416-plls-c32-ddr",
.data = &st_pll3200c32_ddr_416,
},
{
.compatible = "st,stih407-plls-c32-a0",
.data = &st_pll3200c32_407_a0,
},
{
.compatible = "st,plls-c32-cx_0",
.data = &st_pll3200c32_cx_0,
},
{
.compatible = "st,plls-c32-cx_1",
.data = &st_pll3200c32_cx_1,
},
{
.compatible = "st,stih407-plls-c32-a9",
.data = &st_pll3200c32_407_a9,
},
{
.compatible = "st,stih418-plls-c28-a9",
.data = &st_pll4600c28_418_a9,
},
{}
};
static void __init clkgen_c32_pll_setup(struct device_node *np)
{
const struct of_device_id *match;
struct clk *clk;
const char *parent_name, *pll_name;
void __iomem *pll_base;
int num_odfs, odf;
struct clk_onecell_data *clk_data;
struct clkgen_pll_data *data;
unsigned long pll_flags = 0;
match = of_match_node(c32_pll_of_match, np);
if (!match) {
pr_err("%s: No matching data\n", __func__);
return;
}
data = (struct clkgen_pll_data *) match->data;
parent_name = of_clk_get_parent_name(np, 0);
if (!parent_name)
return;
pll_base = clkgen_get_register_base(np);
if (!pll_base)
return;
of_clk_detect_critical(np, 0, &pll_flags);
clk = clkgen_pll_register(parent_name, data, pll_base, pll_flags,
np->name, data->lock);
if (IS_ERR(clk))
return;
pll_name = __clk_get_name(clk);
num_odfs = data->num_odfs;
clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
if (!clk_data)
return;
clk_data->clk_num = num_odfs;
clk_data->clks = kzalloc(clk_data->clk_num * sizeof(struct clk *),
GFP_KERNEL);
if (!clk_data->clks)
goto err;
for (odf = 0; odf < num_odfs; odf++) {
struct clk *clk;
const char *clk_name;
unsigned long odf_flags = 0;
if (of_property_read_string_index(np, "clock-output-names",
odf, &clk_name))
return;
of_clk_detect_critical(np, odf, &odf_flags);
clk = clkgen_odf_register(pll_name, pll_base, data, odf_flags,
odf, &clkgena_c32_odf_lock, clk_name);
if (IS_ERR(clk))
goto err;
clk_data->clks[odf] = clk;
}
of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
return;
err:
kfree(pll_name);
kfree(clk_data->clks);
kfree(clk_data);
}
CLK_OF_DECLARE(clkgen_c32_pll, "st,clkgen-plls-c32", clkgen_c32_pll_setup);
static const struct of_device_id c32_gpu_pll_of_match[] = {
{
.compatible = "st,stih415-gpu-pll-c32",
.data = &st_pll1200c32_gpu_415,
},
{
.compatible = "st,stih416-gpu-pll-c32",
.data = &st_pll1200c32_gpu_416,
},
{}
};
static void __init clkgengpu_c32_pll_setup(struct device_node *np)
{
const struct of_device_id *match;
struct clk *clk;
const char *parent_name;
void __iomem *reg;
const char *clk_name;
struct clkgen_pll_data *data;
match = of_match_node(c32_gpu_pll_of_match, np);
if (!match) {
pr_err("%s: No matching data\n", __func__);
return;
}
data = (struct clkgen_pll_data *)match->data;
parent_name = of_clk_get_parent_name(np, 0);
if (!parent_name)
return;
reg = clkgen_get_register_base(np);
if (!reg)
return;
if (of_property_read_string_index(np, "clock-output-names",
0, &clk_name))
return;
/*
* PLL 1200MHz output
*/
clk = clkgen_pll_register(parent_name, data, reg,
0, clk_name, data->lock);
if (!IS_ERR(clk))
of_clk_add_provider(np, of_clk_src_simple_get, clk);
return;
}
CLK_OF_DECLARE(clkgengpu_c32_pll,
"st,clkgengpu-pll-c32", clkgengpu_c32_pll_setup);
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