[PATCH v10 4/9] soc: renesas: rzn1-sysc: Export function to set dmamux

Miquel Raynal
2022-04-12T19:41:03Z

The dmamux register is located within the system controller.

Without syscon, we need an extra helper in order to give write access to
this register to a dmamux driver.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
---
drivers/clk/renesas/r9a06g032-clocks.c | 35 ++++++++++++++++++-
include/linux/soc/renesas/r9a06g032-sysctrl.h | 11 ++++++
2 files changed, 45 insertions(+), 1 deletion(-)
create mode 100644 include/linux/soc/renesas/r9a06g032-sysctrl.h

diff --git a/drivers/clk/renesas/r9a06g032-clocks.c b/drivers/clk/renesas/r9a06g032-clocks.c
index c99942f0e4d4..052d99059981 100644
--- a/drivers/clk/renesas/r9a06g032-clocks.c
+++ b/drivers/clk/renesas/r9a06g032-clocks.c
@@ -20,9 +20,12 @@
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
+#include <linux/soc/renesas/r9a06g032-sysctrl.h>
#include <linux/spinlock.h>
#include <dt-bindings/clock/r9a06g032-sysctrl.h>

+#define R9A06G032_SYSCTRL_DMAMUX 0xA0
+
struct r9a06g032_gate {
u16 gate, reset, ready, midle,
scon, mirack, mistat;
@@ -315,6 +318,30 @@ struct r9a06g032_priv {
void __iomem *reg;
};

+static struct r9a06g032_priv *sysctrl_priv;
+
+/* Exported helper to access the DMAMUX register */
+int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val)
+{
+ unsigned long flags;
+ u32 dmamux;
+
+ if (!sysctrl_priv)
+ return -EPROBE_DEFER;
+
+ spin_lock_irqsave(&sysctrl_priv->lock, flags);
+
+ dmamux = readl(sysctrl_priv->reg + R9A06G032_SYSCTRL_DMAMUX);
+ dmamux &= ~mask;
+ dmamux |= val & mask;
+ writel(dmamux, sysctrl_priv->reg + R9A06G032_SYSCTRL_DMAMUX);
+
+ spin_unlock_irqrestore(&sysctrl_priv->lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(r9a06g032_sysctrl_set_dmamux);
+
/* register/bit pairs are encoded as an uint16_t */
static void
clk_rdesc_set(struct r9a06g032_priv *clocks,
@@ -963,7 +990,13 @@ static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
if (error)
return error;

- return r9a06g032_add_clk_domain(dev);
+ error = r9a06g032_add_clk_domain(dev);
+ if (error)
+ return error;
+
+ sysctrl_priv = clocks;
+
+ return 0;
}

static const struct of_device_id r9a06g032_match[] = {
diff --git a/include/linux/soc/renesas/r9a06g032-sysctrl.h b/include/linux/soc/renesas/r9a06g032-sysctrl.h
new file mode 100644
index 000000000000..066dfb15cbdd
--- /dev/null
+++ b/include/linux/soc/renesas/r9a06g032-sysctrl.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_SOC_RENESAS_R9A06G032_SYSCTRL_H__
+#define __LINUX_SOC_RENESAS_R9A06G032_SYSCTRL_H__
+
+#ifdef CONFIG_CLK_R9A06G032
+int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val);
+#else
+static inline int r9a06g032_sysctrl_set_dmamux(u32 mask, u32 val) { return -ENODEV; }
+#endif
+
+#endif /* __LINUX_SOC_RENESAS_R9A06G032_SYSCTRL_H__ */
--
2.27.0