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// SPDX-License-Identifier: GPL-2.0
/*
* R-Car Gen3 Clock Pulse Generator Library
*
* Copyright (C) 2015-2018 Glider bvba
* Copyright (C) 2019 Renesas Electronics Corp.
*
* Based on clk-rcar-gen3.c
*
* Copyright (C) 2015 Renesas Electronics Corp.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/sys_soc.h>
#include "rcar-cpg-lib.h"
spinlock_t cpg_lock;
void cpg_reg_modify(void __iomem *reg, u32 clear, u32 set)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&cpg_lock, flags);
val = readl(reg);
val &= ~clear;
val |= set;
writel(val, reg);
spin_unlock_irqrestore(&cpg_lock, flags);
};
static int cpg_simple_notifier_call(struct notifier_block *nb,
unsigned long action, void *data)
{
struct cpg_simple_notifier *csn =
container_of(nb, struct cpg_simple_notifier, nb);
switch (action) {
case PM_EVENT_SUSPEND:
csn->saved = readl(csn->reg);
return NOTIFY_OK;
case PM_EVENT_RESUME:
writel(csn->saved, csn->reg);
return NOTIFY_OK;
}
return NOTIFY_DONE;
}
void cpg_simple_notifier_register(struct raw_notifier_head *notifiers,
struct cpg_simple_notifier *csn)
{
csn->nb.notifier_call = cpg_simple_notifier_call;
raw_notifier_chain_register(notifiers, &csn->nb);
}
/*
* SDn Clock
*/
#define SDnSRCFC_SHIFT 2
#define STPnHCK BIT(9 - SDnSRCFC_SHIFT)
static const struct clk_div_table cpg_sdh_div_table[] = {
/*
* These values are recommended by the datasheet. Because they come
* first, Linux will only use these.
*/
{ 0, 1 }, { 1, 2 }, { STPnHCK | 2, 4 }, { STPnHCK | 3, 8 },
{ STPnHCK | 4, 16 },
/*
* These values are not recommended because STPnHCK is wrong. But they
* have been seen because of broken firmware. So, we support reading
* them but Linux will sanitize them when initializing through
* recalc_rate.
*/
{ STPnHCK | 0, 1 }, { STPnHCK | 1, 2 }, { 2, 4 }, { 3, 8 }, { 4, 16 },
/* Sentinel */
{ 0, 0 }
};
struct clk * __init cpg_sdh_clk_register(const char *name,
void __iomem *sdnckcr, const char *parent_name,
struct raw_notifier_head *notifiers)
{
struct cpg_simple_notifier *csn;
struct clk *clk;
csn = kzalloc(sizeof(*csn), GFP_KERNEL);
if (!csn)
return ERR_PTR(-ENOMEM);
csn->reg = sdnckcr;
clk = clk_register_divider_table(NULL, name, parent_name, 0, sdnckcr,
SDnSRCFC_SHIFT, 8, 0, cpg_sdh_div_table,
&cpg_lock);
if (IS_ERR(clk)) {
kfree(csn);
return clk;
}
cpg_simple_notifier_register(notifiers, csn);
return clk;
}
static const struct clk_div_table cpg_sd_div_table[] = {
{ 0, 2 }, { 1, 4 }, { 0, 0 },
};
struct clk * __init cpg_sd_clk_register(const char *name,
void __iomem *sdnckcr, const char *parent_name)
{
return clk_register_divider_table(NULL, name, parent_name, 0, sdnckcr,
0, 2, 0, cpg_sd_div_table, &cpg_lock);
}
struct rpc_clock {
struct clk_divider div;
struct clk_gate gate;
/*
* One notifier covers both RPC and RPCD2 clocks as they are both
* controlled by the same RPCCKCR register...
*/
struct cpg_simple_notifier csn;
};
static const struct clk_div_table cpg_rpc_div_table[] = {
{ 1, 2 }, { 3, 4 }, { 5, 6 }, { 7, 8 }, { 0, 0 },
};
struct clk * __init cpg_rpc_clk_register(const char *name,
void __iomem *rpcckcr, const char *parent_name,
struct raw_notifier_head *notifiers)
{
struct rpc_clock *rpc;
struct clk *clk;
rpc = kzalloc(sizeof(*rpc), GFP_KERNEL);
if (!rpc)
return ERR_PTR(-ENOMEM);
rpc->div.reg = rpcckcr;
rpc->div.width = 3;
rpc->div.table = cpg_rpc_div_table;
rpc->div.lock = &cpg_lock;
rpc->gate.reg = rpcckcr;
rpc->gate.bit_idx = 8;
rpc->gate.flags = CLK_GATE_SET_TO_DISABLE;
rpc->gate.lock = &cpg_lock;
rpc->csn.reg = rpcckcr;
clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
&rpc->div.hw, &clk_divider_ops,
&rpc->gate.hw, &clk_gate_ops,
CLK_SET_RATE_PARENT);
if (IS_ERR(clk)) {
kfree(rpc);
return clk;
}
cpg_simple_notifier_register(notifiers, &rpc->csn);
return clk;
}
struct rpcd2_clock {
struct clk_fixed_factor fixed;
struct clk_gate gate;
};
struct clk * __init cpg_rpcd2_clk_register(const char *name,
void __iomem *rpcckcr,
const char *parent_name)
{
struct rpcd2_clock *rpcd2;
struct clk *clk;
rpcd2 = kzalloc(sizeof(*rpcd2), GFP_KERNEL);
if (!rpcd2)
return ERR_PTR(-ENOMEM);
rpcd2->fixed.mult = 1;
rpcd2->fixed.div = 2;
rpcd2->gate.reg = rpcckcr;
rpcd2->gate.bit_idx = 9;
rpcd2->gate.flags = CLK_GATE_SET_TO_DISABLE;
rpcd2->gate.lock = &cpg_lock;
clk = clk_register_composite(NULL, name, &parent_name, 1, NULL, NULL,
&rpcd2->fixed.hw, &clk_fixed_factor_ops,
&rpcd2->gate.hw, &clk_gate_ops,
CLK_SET_RATE_PARENT);
if (IS_ERR(clk))
kfree(rpcd2);
return clk;
}
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