// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Ingenic SoC CGU driver
*
* Copyright (c) 2013-2015 Imagination Technologies
* Author: Paul Burton <[email protected]>
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/math64.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/time.h>
#include "cgu.h"
#define MHZ (1000 * 1000)
static inline const struct ingenic_cgu_clk_info *
to_clk_info(struct ingenic_clk *clk)
{
return &clk->cgu->clock_info[clk->idx];
}
/**
* ingenic_cgu_gate_get() - get the value of clock gate register bit
* @cgu: reference to the CGU whose registers should be read
* @info: info struct describing the gate bit
*
* Retrieves the state of the clock gate bit described by info. The
* caller must hold cgu->lock.
*
* Return: true if the gate bit is set, else false.
*/
static inline bool
ingenic_cgu_gate_get(struct ingenic_cgu *cgu,
const struct ingenic_cgu_gate_info *info)
{
return !!(readl(cgu->base + info->reg) & BIT(info->bit))
^ info->clear_to_gate;
}
/**
* ingenic_cgu_gate_set() - set the value of clock gate register bit
* @cgu: reference to the CGU whose registers should be modified
* @info: info struct describing the gate bit
* @val: non-zero to gate a clock, otherwise zero
*
* Sets the given gate bit in order to gate or ungate a clock.
*
* The caller must hold cgu->lock.
*/
static inline void
ingenic_cgu_gate_set(struct ingenic_cgu *cgu,
const struct ingenic_cgu_gate_info *info, bool val)
{
u32 clkgr = readl(cgu->base + info->reg);
if (val ^ info->clear_to_gate)
clkgr |= BIT(info->bit);
else
clkgr &= ~BIT(info->bit);
writel(clkgr, cgu->base + info->reg);
}
/*
* PLL operations
*/
static unsigned long
ingenic_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
const struct ingenic_cgu_pll_info *pll_info;
unsigned m, n, od, od_enc = 0;
bool bypass;
u32 ctl;
BUG_ON(clk_info->type != CGU_CLK_PLL);
pll_info = &clk_info->pll;
ctl = readl(cgu->base + pll_info->reg);
m = (ctl >> pll_info->m_shift) & GENMASK(pll_info->m_bits - 1, 0);
m += pll_info->m_offset;
n = (ctl >> pll_info->n_shift) & GENMASK(pll_info->n_bits - 1, 0);
n += pll_info->n_offset;
if (pll_info->od_bits > 0) {
od_enc = ctl >> pll_info->od_shift;
od_enc &= GENMASK(pll_info->od_bits - 1, 0);
}
if (pll_info->bypass_bit >= 0) {
ctl = readl(cgu->base + pll_info->bypass_reg);
bypass = !!(ctl & BIT(pll_info->bypass_bit));
if (bypass)
return parent_rate;
}
for (od = 0; od < pll_info->od_max; od++)
if (pll_info->od_encoding[od] == od_enc)
break;
/* if od_max = 0, od_bits should be 0 and od is fixed to 1. */
if (pll_info->od_max == 0)
BUG_ON(pll_info->od_bits != 0);
else
BUG_ON(od == pll_info->od_max);
od++;
return div_u64((u64)parent_rate * m * pll_info->rate_multiplier,
n * od);
}
static void
ingenic_pll_calc_m_n_od(const struct ingenic_cgu_pll_info *pll_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *pm, unsigned int *pn, unsigned int *pod)
{
unsigned int m, n, od = 1;
/*
* The frequency after the input divider must be between 10 and 50 MHz.
* The highest divider yields the best resolution.
*/
n = parent_rate / (10 * MHZ);
n = min_t(unsigned int, n, 1 << pll_info->n_bits);
n = max_t(unsigned int, n, pll_info->n_offset);
m = (rate / MHZ) * od * n / (parent_rate / MHZ);
m = min_t(unsigned int, m, 1 << pll_info->m_bits);
m = max_t(unsigned int, m, pll_info->m_offset);
*pm = m;
*pn = n;
*pod = od;
}
static unsigned long
ingenic_pll_calc(const struct ingenic_cgu_clk_info *clk_info,
unsigned long rate, unsigned long parent_rate,
unsigned int *pm, unsigned int *pn, unsigned int *pod)
{
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
unsigned int m, n, od;
if (pll_info->calc_m_n_od)
(*pll_info->calc_m_n_od)(pll_info, rate, parent_rate, &m, &n, &od);
else
ingenic_pll_calc_m_n_od(pll_info, rate, parent_rate, &m, &n, &od);
if (pm)
*pm = m;
if (pn)
*pn = n;
if (pod)
*pod = od;
return div_u64((u64)parent_rate * m * pll_info->rate_multiplier,
n * od);
}
static long
ingenic_pll_round_rate(struct clk_hw *hw, unsigned long req_rate,
unsigned long *prate)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
return ingenic_pll_calc(clk_info, req_rate, *prate, NULL, NULL, NULL);
}
static inline int ingenic_pll_check_stable(struct ingenic_cgu *cgu,
const struct ingenic_cgu_pll_info *pll_info)
{
u32 ctl;
if (pll_info->stable_bit < 0)
return 0;
return readl_poll_timeout(cgu->base + pll_info->reg, ctl,
ctl & BIT(pll_info->stable_bit),
0, 100 * USEC_PER_MSEC);
}
static int
ingenic_pll_set_rate(struct clk_hw *hw, unsigned long req_rate,
unsigned long parent_rate)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
unsigned long rate, flags;
unsigned int m, n, od;
int ret = 0;
u32 ctl;
rate = ingenic_pll_calc(clk_info, req_rate, parent_rate,
&m, &n, &od);
if (rate != req_rate)
pr_info("ingenic-cgu: request '%s' rate %luHz, actual %luHz\n",
clk_info->name, req_rate, rate);
spin_lock_irqsave(&cgu->lock, flags);
ctl = readl(cgu->base + pll_info->reg);
ctl &= ~(GENMASK(pll_info->m_bits - 1, 0) << pll_info->m_shift);
ctl |= (m - pll_info->m_offset) << pll_info->m_shift;
ctl &= ~(GENMASK(pll_info->n_bits - 1, 0) << pll_info->n_shift);
ctl |= (n - pll_info->n_offset) << pll_info->n_shift;
if (pll_info->od_bits > 0) {
ctl &= ~(GENMASK(pll_info->od_bits - 1, 0) << pll_info->od_shift);
ctl |= pll_info->od_encoding[od - 1] << pll_info->od_shift;
}
writel(ctl, cgu->base + pll_info->reg);
if (pll_info->set_rate_hook)
pll_info->set_rate_hook(pll_info, rate, parent_rate);
/* If the PLL is enabled, verify that it's stable */
if (pll_info->enable_bit >= 0 && (ctl & BIT(pll_info->enable_bit)))
ret = ingenic_pll_check_stable(cgu, pll_info);
spin_unlock_irqrestore(&cgu->lock, flags);
return ret;
}
static int ingenic_pll_enable(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
unsigned long flags;
int ret;
u32 ctl;
if (pll_info->enable_bit < 0)
return 0;
spin_lock_irqsave(&cgu->lock, flags);
if (pll_info->bypass_bit >= 0) {
ctl = readl(cgu->base + pll_info->bypass_reg);
ctl &= ~BIT(pll_info->bypass_bit);
writel(ctl, cgu->base + pll_info->bypass_reg);
}
ctl = readl(cgu->base + pll_info->reg);
ctl |= BIT(pll_info->enable_bit);
writel(ctl, cgu->base + pll_info->reg);
ret = ingenic_pll_check_stable(cgu, pll_info);
spin_unlock_irqrestore(&cgu->lock, flags);
return ret;
}
static void ingenic_pll_disable(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
unsigned long flags;
u32 ctl;
if (pll_info->enable_bit < 0)
return;
spin_lock_irqsave(&cgu->lock, flags);
ctl = readl(cgu->base + pll_info->reg);
ctl &= ~BIT(pll_info->enable_bit);
writel(ctl, cgu->base + pll_info->reg);
spin_unlock_irqrestore(&cgu->lock, flags);
}
static int ingenic_pll_is_enabled(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
const struct ingenic_cgu_pll_info *pll_info = &clk_info->pll;
u32 ctl;
if (pll_info->enable_bit < 0)
return true;
ctl = readl(cgu->base + pll_info->reg);
return !!(ctl & BIT(pll_info->enable_bit));
}
static const struct clk_ops ingenic_pll_ops = {
.recalc_rate = ingenic_pll_recalc_rate,
.round_rate = ingenic_pll_round_rate,
.set_rate = ingenic_pll_set_rate,
.enable = ingenic_pll_enable,
.disable = ingenic_pll_disable,
.is_enabled = ingenic_pll_is_enabled,
};
/*
* Operations for all non-PLL clocks
*/
static u8 ingenic_clk_get_parent(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
u32 reg;
u8 i, hw_idx, idx = 0;
if (clk_info->type & CGU_CLK_MUX) {
reg = readl(cgu->base + clk_info->mux.reg);
hw_idx = (reg >> clk_info->mux.shift) &
GENMASK(clk_info->mux.bits - 1, 0);
/*
* Convert the hardware index to the parent index by skipping
* over any -1's in the parents array.
*/
for (i = 0; i < hw_idx; i++) {
if (clk_info->parents[i] != -1)
idx++;
}
}
return idx;
}
static int ingenic_clk_set_parent(struct clk_hw *hw, u8 idx)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
unsigned long flags;
u8 curr_idx, hw_idx, num_poss;
u32 reg, mask;
if (clk_info->type & CGU_CLK_MUX) {
/*
* Convert the parent index to the hardware index by adding
* 1 for any -1 in the parents array preceding the given
* index. That is, we want the index of idx'th entry in
* clk_info->parents which does not equal -1.
*/
hw_idx = curr_idx = 0;
num_poss = 1 << clk_info->mux.bits;
for (; hw_idx < num_poss; hw_idx++) {
if (clk_info->parents[hw_idx] == -1)
continue;
if (curr_idx == idx)
break;
curr_idx++;
}
/* idx should always be a valid parent */
BUG_ON(curr_idx != idx);
mask = GENMASK(clk_info->mux.bits - 1, 0);
mask <<= clk_info->mux.shift;
spin_lock_irqsave(&cgu->lock, flags);
/* write the register */
reg = readl(cgu->base + clk_info->mux.reg);
reg &= ~mask;
reg |= hw_idx << clk_info->mux.shift;
writel(reg, cgu->base + clk_info->mux.reg);
spin_unlock_irqrestore(&cgu->lock, flags);
return 0;
}
return idx ? -EINVAL : 0;
}
static unsigned long
ingenic_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
unsigned long rate = parent_rate;
u32 div_reg, div;
u8 parent;
if (clk_info->type & CGU_CLK_DIV) {
parent = ingenic_clk_get_parent(hw);
if (!(clk_info->div.bypass_mask & BIT(parent))) {
div_reg = readl(cgu->base + clk_info->div.reg);
div = (div_reg >> clk_info->div.shift) &
GENMASK(clk_info->div.bits - 1, 0);
if (clk_info->div.div_table)
div = clk_info->div.div_table[div];
else
div = (div + 1) * clk_info->div.div;
rate /= div;
}
} else if (clk_info->type & CGU_CLK_FIXDIV) {
rate /= clk_info->fixdiv.div;
}
return rate;
}
static unsigned int
ingenic_clk_calc_hw_div(const struct ingenic_cgu_clk_info *clk_info,
unsigned int div)
{
unsigned int i, best_i = 0, best = (unsigned int)-1;
for (i = 0; i < (1 << clk_info->div.bits)
&& clk_info->div.div_table[i]; i++) {
if (clk_info->div.div_table[i] >= div &&
clk_info->div.div_table[i] < best) {
best = clk_info->div.div_table[i];
best_i = i;
if (div == best)
break;
}
}
return best_i;
}
static unsigned
ingenic_clk_calc_div(struct clk_hw *hw,
const struct ingenic_cgu_clk_info *clk_info,
unsigned long parent_rate, unsigned long req_rate)
{
unsigned int div, hw_div;
u8 parent;
parent = ingenic_clk_get_parent(hw);
if (clk_info->div.bypass_mask & BIT(parent))
return 1;
/* calculate the divide */
div = DIV_ROUND_UP(parent_rate, req_rate);
if (clk_info->div.div_table) {
hw_div = ingenic_clk_calc_hw_div(clk_info, div);
return clk_info->div.div_table[hw_div];
}
/* Impose hardware constraints */
div = clamp_t(unsigned int, div, clk_info->div.div,
clk_info->div.div << clk_info->div.bits);
/*
* If the divider value itself must be divided before being written to
* the divider register, we must ensure we don't have any bits set that
* would be lost as a result of doing so.
*/
div = DIV_ROUND_UP(div, clk_info->div.div);
div *= clk_info->div.div;
return div;
}
static int ingenic_clk_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
unsigned int div = 1;
if (clk_info->type & CGU_CLK_DIV)
div = ingenic_clk_calc_div(hw, clk_info, req->best_parent_rate,
req->rate);
else if (clk_info->type & CGU_CLK_FIXDIV)
div = clk_info->fixdiv.div;
else if (clk_hw_can_set_rate_parent(hw))
req->best_parent_rate = req->rate;
req->rate = DIV_ROUND_UP(req->best_parent_rate, div);
return 0;
}
static inline int ingenic_clk_check_stable(struct ingenic_cgu *cgu,
const struct ingenic_cgu_clk_info *clk_info)
{
u32 reg;
return readl_poll_timeout(cgu->base + clk_info->div.reg, reg,
!(reg & BIT(clk_info->div.busy_bit)),
0, 100 * USEC_PER_MSEC);
}
static int
ingenic_clk_set_rate(struct clk_hw *hw, unsigned long req_rate,
unsigned long parent_rate)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
unsigned long rate, flags;
unsigned int hw_div, div;
u32 reg, mask;
int ret = 0;
if (clk_info->type & CGU_CLK_DIV) {
div = ingenic_clk_calc_div(hw, clk_info, parent_rate, req_rate);
rate = DIV_ROUND_UP(parent_rate, div);
if (rate != req_rate)
return -EINVAL;
if (clk_info->div.div_table)
hw_div = ingenic_clk_calc_hw_div(clk_info, div);
else
hw_div = ((div / clk_info->div.div) - 1);
spin_lock_irqsave(&cgu->lock, flags);
reg = readl(cgu->base + clk_info->div.reg);
/* update the divide */
mask = GENMASK(clk_info->div.bits - 1, 0);
reg &= ~(mask << clk_info->div.shift);
reg |= hw_div << clk_info->div.shift;
/* clear the stop bit */
if (clk_info->div.stop_bit != -1)
reg &= ~BIT(clk_info->div.stop_bit);
/* set the change enable bit */
if (clk_info->div.ce_bit != -1)
reg |= BIT(clk_info->div.ce_bit);
/* update the hardware */
writel(reg, cgu->base + clk_info->div.reg);
/* wait for the change to take effect */
if (clk_info->div.busy_bit != -1)
ret = ingenic_clk_check_stable(cgu, clk_info);
spin_unlock_irqrestore(&cgu->lock, flags);
return ret;
}
return -EINVAL;
}
static int ingenic_clk_enable(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
unsigned long flags;
if (clk_info->type & CGU_CLK_GATE) {
/* ungate the clock */
spin_lock_irqsave(&cgu->lock, flags);
ingenic_cgu_gate_set(cgu, &clk_info->gate, false);
spin_unlock_irqrestore(&cgu->lock, flags);
if (clk_info->gate.delay_us)
udelay(clk_info->gate.delay_us);
}
return 0;
}
static void ingenic_clk_disable(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
unsigned long flags;
if (clk_info->type & CGU_CLK_GATE) {
/* gate the clock */
spin_lock_irqsave(&cgu->lock, flags);
ingenic_cgu_gate_set(cgu, &clk_info->gate, true);
spin_unlock_irqrestore(&cgu->lock, flags);
}
}
static int ingenic_clk_is_enabled(struct clk_hw *hw)
{
struct ingenic_clk *ingenic_clk = to_ingenic_clk(hw);
const struct ingenic_cgu_clk_info *clk_info = to_clk_info(ingenic_clk);
struct ingenic_cgu *cgu = ingenic_clk->cgu;
int enabled = 1;
if (clk_info->type & CGU_CLK_GATE)
enabled = !ingenic_cgu_gate_get(cgu, &clk_info->gate);
return enabled;
}
static const struct clk_ops ingenic_clk_ops = {
.get_parent = ingenic_clk_get_parent,
.set_parent = ingenic_clk_set_parent,
.recalc_rate = ingenic_clk_recalc_rate,
.determine_rate = ingenic_clk_determine_rate,
.set_rate = ingenic_clk_set_rate,
.enable = ingenic_clk_enable,
.disable = ingenic_clk_disable,
.is_enabled = ingenic_clk_is_enabled,
};
/*
* Setup functions.
*/
static int ingenic_register_clock(struct ingenic_cgu *cgu, unsigned idx)
{
const struct ingenic_cgu_clk_info *clk_info = &cgu->clock_info[idx];
struct clk_init_data clk_init;
struct ingenic_clk *ingenic_clk = NULL;
struct clk *clk, *parent;
const char *parent_names[4];
unsigned caps, i, num_possible;
int err = -EINVAL;
BUILD_BUG_ON(ARRAY_SIZE(clk_info->parents) > ARRAY_SIZE(parent_names));
if (clk_info->type == CGU_CLK_EXT) {
clk = of_clk_get_by_name(cgu->np, clk_info->name);
if (IS_ERR(clk)) {
pr_err("%s: no external clock '%s' provided\n",
__func__, clk_info->name);
err = -ENODEV;
goto out;
}
err = clk_register_clkdev(clk, clk_info->name, NULL);
if (err) {
clk_put(clk);
goto out;
}
cgu->clocks.clks[idx] = clk;
return 0;
}
if (!clk_info->type) {
pr_err("%s: no clock type specified for '%s'\n", __func__,
clk_info->name);
goto out;
}
ingenic_clk = kzalloc(sizeof(*ingenic_clk), GFP_KERNEL);
if (!ingenic_clk) {
err = -ENOMEM;
goto out;
}
ingenic_clk->hw.init = &clk_init;
ingenic_clk->cgu = cgu;
ingenic_clk->idx = idx;
clk_init.name = clk_info->name;
clk_init.flags = clk_info->flags;
clk_init.parent_names = parent_names;
caps = clk_info->type;
if (caps & CGU_CLK_DIV) {
caps &= ~CGU_CLK_DIV;
} else if (!(caps & CGU_CLK_CUSTOM)) {
/* pass rate changes to the parent clock */
clk_init.flags |= CLK_SET_RATE_PARENT;
}
if (caps & (CGU_CLK_MUX | CGU_CLK_CUSTOM)) {
clk_init.num_parents = 0;
if (caps & CGU_CLK_MUX)
num_possible = 1 << clk_info->mux.bits;
else
num_possible = ARRAY_SIZE(clk_info->parents);
for (i = 0; i < num_possible; i++) {
if (clk_info->parents[i] == -1)
continue;
parent = cgu->clocks.clks[clk_info->parents[i]];
parent_names[clk_init.num_parents] =
__clk_get_name(parent);
clk_init.num_parents++;
}
BUG_ON(!clk_init.num_parents);
BUG_ON(clk_init.num_parents > ARRAY_SIZE(parent_names));
} else {
BUG_ON(clk_info->parents[0] == -1);
clk_init.num_parents = 1;
parent = cgu->clocks.clks[clk_info->parents[0]];
parent_names[0] = __clk_get_name(parent);
}
if (caps & CGU_CLK_CUSTOM) {
clk_init.ops = clk_info->custom.clk_ops;
caps &= ~CGU_CLK_CUSTOM;
if (caps) {
pr_err("%s: custom clock may not be combined with type 0x%x\n",
__func__, caps);
goto out;
}
} else if (caps & CGU_CLK_PLL) {
clk_init.ops = &ingenic_pll_ops;
caps &= ~CGU_CLK_PLL;
if (caps) {
pr_err("%s: PLL may not be combined with type 0x%x\n",
__func__, caps);
goto out;
}
} else {
clk_init.ops = &ingenic_clk_ops;
}
/* nothing to do for gates or fixed dividers */
caps &= ~(CGU_CLK_GATE | CGU_CLK_FIXDIV);
if (caps & CGU_CLK_MUX) {
if (!(caps & CGU_CLK_MUX_GLITCHFREE))
clk_init.flags |= CLK_SET_PARENT_GATE;
caps &= ~(CGU_CLK_MUX | CGU_CLK_MUX_GLITCHFREE);
}
if (caps) {
pr_err("%s: unknown clock type 0x%x\n", __func__, caps);
goto out;
}
clk = clk_register(NULL, &ingenic_clk->hw);
if (IS_ERR(clk)) {
pr_err("%s: failed to register clock '%s'\n", __func__,
clk_info->name);
err = PTR_ERR(clk);
goto out;
}
err = clk_register_clkdev(clk, clk_info->name, NULL);
if (err)
goto out;
cgu->clocks.clks[idx] = clk;
out:
if (err)
kfree(ingenic_clk);
return err;
}
struct ingenic_cgu *
ingenic_cgu_new(const struct ingenic_cgu_clk_info *clock_info,
unsigned num_clocks, struct device_node *np)
{
struct ingenic_cgu *cgu;
cgu = kzalloc(sizeof(*cgu), GFP_KERNEL);
if (!cgu)
goto err_out;
cgu->base = of_iomap(np, 0);
if (!cgu->base) {
pr_err("%s: failed to map CGU registers\n", __func__);
goto err_out_free;
}
cgu->np = np;
cgu->clock_info = clock_info;
cgu->clocks.clk_num = num_clocks;
spin_lock_init(&cgu->lock);
return cgu;
err_out_free:
kfree(cgu);
err_out:
return NULL;
}
int ingenic_cgu_register_clocks(struct ingenic_cgu *cgu)
{
unsigned i;
int err;
cgu->clocks.clks = kcalloc(cgu->clocks.clk_num, sizeof(struct clk *),
GFP_KERNEL);
if (!cgu->clocks.clks) {
err = -ENOMEM;
goto err_out;
}
for (i = 0; i < cgu->clocks.clk_num; i++) {
err = ingenic_register_clock(cgu, i);
if (err)
goto err_out_unregister;
}
err = of_clk_add_provider(cgu->np, of_clk_src_onecell_get,
&cgu->clocks);
if (err)
goto err_out_unregister;
return 0;
err_out_unregister:
for (i = 0; i < cgu->clocks.clk_num; i++) {
if (!cgu->clocks.clks[i])
continue;
if (cgu->clock_info[i].type & CGU_CLK_EXT)
clk_put(cgu->clocks.clks[i]);
else
clk_unregister(cgu->clocks.clks[i]);
}
kfree(cgu->clocks.clks);
err_out:
return err;
}
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