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Message-Id: <20240224202053.25313-6-semen.protsenko@linaro.org>
Date: Sat, 24 Feb 2024 14:20:43 -0600
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Chanwoo Choi <cw00.choi@...sung.com>
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>,
Rob Herring <robh@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Tomasz Figa <tomasz.figa@...il.com>,
linux-samsung-soc@...r.kernel.org,
linux-clk@...r.kernel.org,
devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 05/15] clk: samsung: Use single CPU clock notifier callback for all chips
Reduce the code duplication by making all chips use a single version of
exynos_cpuclk_notifier_cb() function. That will prevent the code bloat
when adding new chips support too.
Also don't pass base address to pre/post rate change functions, as it
can be easily derived from already passed cpuclk param.
No functional change.
Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
Changes in v3:
- none
Changes in v2:
- none
drivers/clk/samsung/clk-cpu.c | 63 ++++++++++++++++-------------------
1 file changed, 28 insertions(+), 35 deletions(-)
diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index 7b6fd331a7ec..427018e8dd8c 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -66,6 +66,11 @@
#define DIV_MASK_ALL GENMASK(31, 0)
#define MUX_MASK GENMASK(2, 0)
+struct exynos_cpuclk;
+
+typedef int (*exynos_rate_change_fn_t)(struct clk_notifier_data *ndata,
+ struct exynos_cpuclk *cpuclk);
+
/**
* struct exynos_cpuclk - information about clock supplied to a CPU core
* @hw: handle between CCF and CPU clock
@@ -78,6 +83,8 @@
* @clk_nb: clock notifier registered for changes in clock speed of the
* primary parent clock
* @flags: configuration flags for the CPU clock
+ * @pre_rate_cb: callback to run before CPU clock rate change
+ * @post_rate_cb: callback to run after CPU clock rate change
*
* This structure holds information required for programming the CPU clock for
* various clock speeds.
@@ -91,6 +98,9 @@ struct exynos_cpuclk {
const unsigned long num_cfgs;
struct notifier_block clk_nb;
unsigned long flags;
+
+ exynos_rate_change_fn_t pre_rate_cb;
+ exynos_rate_change_fn_t post_rate_cb;
};
/*
@@ -178,9 +188,10 @@ static void exynos_set_safe_div(void __iomem *base, unsigned long div,
/* handler for pre-rate change notification from parent clock */
static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
- struct exynos_cpuclk *cpuclk, void __iomem *base)
+ struct exynos_cpuclk *cpuclk)
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+ void __iomem *base = cpuclk->ctrl_base;
unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
unsigned long div0, div1 = 0, mux_reg;
unsigned long flags;
@@ -255,9 +266,10 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
/* handler for post-rate change notification from parent clock */
static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
- struct exynos_cpuclk *cpuclk, void __iomem *base)
+ struct exynos_cpuclk *cpuclk)
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+ void __iomem *base = cpuclk->ctrl_base;
unsigned long div = 0, div_mask = DIV_MASK;
unsigned long mux_reg;
unsigned long flags;
@@ -306,9 +318,10 @@ static void exynos5433_set_safe_div(void __iomem *base, unsigned long div,
/* handler for pre-rate change notification from parent clock */
static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
- struct exynos_cpuclk *cpuclk, void __iomem *base)
+ struct exynos_cpuclk *cpuclk)
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
+ void __iomem *base = cpuclk->ctrl_base;
unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
unsigned long div0, div1 = 0, mux_reg;
unsigned long flags;
@@ -366,8 +379,9 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
/* handler for post-rate change notification from parent clock */
static int exynos5433_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
- struct exynos_cpuclk *cpuclk, void __iomem *base)
+ struct exynos_cpuclk *cpuclk)
{
+ void __iomem *base = cpuclk->ctrl_base;
unsigned long div = 0, div_mask = DIV_MASK;
unsigned long mux_reg;
unsigned long flags;
@@ -393,39 +407,14 @@ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
{
struct clk_notifier_data *ndata = data;
struct exynos_cpuclk *cpuclk;
- void __iomem *base;
int err = 0;
cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
- base = cpuclk->ctrl_base;
if (event == PRE_RATE_CHANGE)
- err = exynos_cpuclk_pre_rate_change(ndata, cpuclk, base);
+ err = cpuclk->pre_rate_cb(ndata, cpuclk);
else if (event == POST_RATE_CHANGE)
- err = exynos_cpuclk_post_rate_change(ndata, cpuclk, base);
-
- return notifier_from_errno(err);
-}
-
-/*
- * This notifier function is called for the pre-rate and post-rate change
- * notifications of the parent clock of cpuclk.
- */
-static int exynos5433_cpuclk_notifier_cb(struct notifier_block *nb,
- unsigned long event, void *data)
-{
- struct clk_notifier_data *ndata = data;
- struct exynos_cpuclk *cpuclk;
- void __iomem *base;
- int err = 0;
-
- cpuclk = container_of(nb, struct exynos_cpuclk, clk_nb);
- base = cpuclk->ctrl_base;
-
- if (event == PRE_RATE_CHANGE)
- err = exynos5433_cpuclk_pre_rate_change(ndata, cpuclk, base);
- else if (event == POST_RATE_CHANGE)
- err = exynos5433_cpuclk_post_rate_change(ndata, cpuclk, base);
+ err = cpuclk->post_rate_cb(ndata, cpuclk);
return notifier_from_errno(err);
}
@@ -467,10 +456,14 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
cpuclk->ctrl_base = ctx->reg_base + clk_data->offset;
cpuclk->lock = &ctx->lock;
cpuclk->flags = clk_data->flags;
- if (clk_data->flags & CLK_CPU_HAS_E5433_REGS_LAYOUT)
- cpuclk->clk_nb.notifier_call = exynos5433_cpuclk_notifier_cb;
- else
- cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
+ cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
+ if (clk_data->flags & CLK_CPU_HAS_E5433_REGS_LAYOUT) {
+ cpuclk->pre_rate_cb = exynos5433_cpuclk_pre_rate_change;
+ cpuclk->post_rate_cb = exynos5433_cpuclk_post_rate_change;
+ } else {
+ cpuclk->pre_rate_cb = exynos_cpuclk_pre_rate_change;
+ cpuclk->post_rate_cb = exynos_cpuclk_post_rate_change;
+ }
ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb);
if (ret) {
--
2.39.2
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