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Message-Id: <20240216223245.12273-3-semen.protsenko@linaro.org>
Date: Fri, 16 Feb 2024 16:32:31 -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 02/16] clk: samsung: Improve clk-cpu.c style
clk-cpu.c has numerous style issues reported by checkpatch and easily
identified otherwise. Give it some love and fix those warnings where it
makes sense. Also make stabilization time a named constant to get rid of
the magic number in clk-cpu.c.
No functional change.
Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
drivers/clk/samsung/clk-cpu.c | 65 ++++++++++++++++++-----------------
1 file changed, 33 insertions(+), 32 deletions(-)
diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c
index 3e62ade120c5..e02730776aaa 100644
--- a/drivers/clk/samsung/clk-cpu.c
+++ b/drivers/clk/samsung/clk-cpu.c
@@ -16,18 +16,18 @@
* of the SoC or supplied after the SoC characterization.
*
* The below implementation of the CPU clock allows the rate changes of the CPU
- * clock and the corresponding rate changes of the auxillary clocks of the CPU
+ * clock and the corresponding rate changes of the auxiliary clocks of the CPU
* domain. The platform clock driver provides a clock register configuration
* for each configurable rate which is then used to program the clock hardware
- * registers to acheive a fast co-oridinated rate change for all the CPU domain
+ * registers to achieve a fast coordinated rate change for all the CPU domain
* clocks.
*
* On a rate change request for the CPU clock, the rate change is propagated
- * upto the PLL supplying the clock to the CPU domain clock blocks. While the
+ * up to the PLL supplying the clock to the CPU domain clock blocks. While the
* CPU domain PLL is reconfigured, the CPU domain clocks are driven using an
* alternate clock source. If required, the alternate clock source is divided
* down in order to keep the output clock rate within the previous OPP limits.
-*/
+ */
#include <linux/errno.h>
#include <linux/io.h>
@@ -50,17 +50,19 @@
#define E5433_DIV_STAT_CPU0 0x500
#define E5433_DIV_STAT_CPU1 0x504
-#define E4210_DIV0_RATIO0_MASK 0x7
-#define E4210_DIV1_HPM_MASK (0x7 << 4)
-#define E4210_DIV1_COPY_MASK (0x7 << 0)
-#define E4210_MUX_HPM_MASK (1 << 20)
+#define E4210_DIV0_RATIO0_MASK GENMASK(2, 0)
+#define E4210_DIV1_HPM_MASK GENMASK(6, 4)
+#define E4210_DIV1_COPY_MASK GENMASK(2, 0)
+#define E4210_MUX_HPM_MASK BIT(20)
#define E4210_DIV0_ATB_SHIFT 16
#define E4210_DIV0_ATB_MASK (DIV_MASK << E4210_DIV0_ATB_SHIFT)
+/* Divider stabilization time, msec */
+#define MAX_STAB_TIME 10
#define MAX_DIV 8
-#define DIV_MASK 7
-#define DIV_MASK_ALL 0xffffffff
-#define MUX_MASK 7
+#define DIV_MASK GENMASK(2, 0)
+#define DIV_MASK_ALL GENMASK(31, 0)
+#define MUX_MASK GENMASK(2, 0)
/*
* Helper function to wait until divider(s) have stabilized after the divider
@@ -68,7 +70,7 @@
*/
static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask)
{
- unsigned long timeout = jiffies + msecs_to_jiffies(10);
+ unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME);
do {
if (!(readl(div_reg) & mask))
@@ -86,9 +88,9 @@ static void wait_until_divider_stable(void __iomem *div_reg, unsigned long mask)
* value was changed.
*/
static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos,
- unsigned long mux_value)
+ unsigned long mux_value)
{
- unsigned long timeout = jiffies + msecs_to_jiffies(10);
+ unsigned long timeout = jiffies + msecs_to_jiffies(MAX_STAB_TIME);
do {
if (((readl(mux_reg) >> mux_pos) & MUX_MASK) == mux_value)
@@ -101,18 +103,18 @@ static void wait_until_mux_stable(void __iomem *mux_reg, u32 mux_pos,
pr_err("%s: re-parenting mux timed-out\n", __func__);
}
-/* common round rate callback useable for all types of CPU clocks */
-static long exynos_cpuclk_round_rate(struct clk_hw *hw,
- unsigned long drate, unsigned long *prate)
+/* common round rate callback usable for all types of CPU clocks */
+static long exynos_cpuclk_round_rate(struct clk_hw *hw, unsigned long drate,
+ unsigned long *prate)
{
struct clk_hw *parent = clk_hw_get_parent(hw);
*prate = clk_hw_round_rate(parent, drate);
return *prate;
}
-/* common recalc rate callback useable for all types of CPU clocks */
+/* common recalc rate callback usable for all types of CPU clocks */
static unsigned long exynos_cpuclk_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
+ unsigned long parent_rate)
{
/*
* The CPU clock output (armclk) rate is the same as its parent
@@ -135,7 +137,7 @@ static const struct clk_ops exynos_cpuclk_clk_ops = {
* dividers to be programmed.
*/
static void exynos_set_safe_div(void __iomem *base, unsigned long div,
- unsigned long mask)
+ unsigned long mask)
{
unsigned long div0;
@@ -151,7 +153,6 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
- unsigned long alt_div = 0, alt_div_mask = DIV_MASK;
unsigned long div0, div1 = 0, mux_reg;
unsigned long flags;
@@ -187,6 +188,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
*/
if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) {
unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate);
+ unsigned long alt_div, alt_div_mask = DIV_MASK;
alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1;
WARN_ON(alt_div >= MAX_DIV);
@@ -215,7 +217,7 @@ static int exynos_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
if (cpuclk->flags & CLK_CPU_HAS_DIV1) {
writel(div1, base + E4210_DIV_CPU1);
wait_until_divider_stable(base + E4210_DIV_STAT_CPU1,
- DIV_MASK_ALL);
+ DIV_MASK_ALL);
}
spin_unlock_irqrestore(cpuclk->lock, flags);
@@ -263,7 +265,7 @@ static int exynos_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
* dividers to be programmed.
*/
static void exynos5433_set_safe_div(void __iomem *base, unsigned long div,
- unsigned long mask)
+ unsigned long mask)
{
unsigned long div0;
@@ -279,7 +281,6 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
{
const struct exynos_cpuclk_cfg_data *cfg_data = cpuclk->cfg;
unsigned long alt_prate = clk_hw_get_rate(cpuclk->alt_parent);
- unsigned long alt_div = 0, alt_div_mask = DIV_MASK;
unsigned long div0, div1 = 0, mux_reg;
unsigned long flags;
@@ -309,6 +310,7 @@ static int exynos5433_cpuclk_pre_rate_change(struct clk_notifier_data *ndata,
*/
if (alt_prate > ndata->old_rate || ndata->old_rate > ndata->new_rate) {
unsigned long tmp_rate = min(ndata->old_rate, ndata->new_rate);
+ unsigned long alt_div, alt_div_mask = DIV_MASK;
alt_div = DIV_ROUND_UP(alt_prate, tmp_rate) - 1;
WARN_ON(alt_div >= MAX_DIV);
@@ -358,7 +360,7 @@ static int exynos5433_cpuclk_post_rate_change(struct clk_notifier_data *ndata,
* notifications of the parent clock of cpuclk.
*/
static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
- unsigned long event, void *data)
+ unsigned long event, void *data)
{
struct clk_notifier_data *ndata = data;
struct exynos_cpuclk *cpuclk;
@@ -381,7 +383,7 @@ static int exynos_cpuclk_notifier_cb(struct notifier_block *nb,
* notifications of the parent clock of cpuclk.
*/
static int exynos5433_cpuclk_notifier_cb(struct notifier_block *nb,
- unsigned long event, void *data)
+ unsigned long event, void *data)
{
struct clk_notifier_data *ndata = data;
struct exynos_cpuclk *cpuclk;
@@ -438,11 +440,10 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
else
cpuclk->clk_nb.notifier_call = exynos_cpuclk_notifier_cb;
-
ret = clk_notifier_register(parent->clk, &cpuclk->clk_nb);
if (ret) {
pr_err("%s: failed to register clock notifier for %s\n",
- __func__, name);
+ __func__, name);
goto free_cpuclk;
}
@@ -454,7 +455,7 @@ static int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
ret = clk_hw_register(NULL, &cpuclk->hw);
if (ret) {
- pr_err("%s: could not register cpuclk %s\n", __func__, name);
+ pr_err("%s: could not register cpuclk %s\n", __func__, name);
goto free_cpuclk_data;
}
@@ -482,8 +483,8 @@ void __init samsung_clk_register_cpu(struct samsung_clk_provider *ctx,
for (num_cfgs = 0; list->cfg[num_cfgs].prate != 0; )
num_cfgs++;
- exynos_register_cpu_clock(ctx, list->id, list->name, hws[list->parent_id],
- hws[list->alt_parent_id], list->offset, list->cfg, num_cfgs,
- list->flags);
+ exynos_register_cpu_clock(ctx, list->id, list->name,
+ hws[list->parent_id], hws[list->alt_parent_id],
+ list->offset, list->cfg, num_cfgs, list->flags);
}
}
--
2.39.2
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