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clk: renesas: r9a06g032: Export function to set dmamux 

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>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20220427095653.91804-5-miquel.raynal@bootlin.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Miquel Raynal 2022-04-27 11:56:48 +02:00 committed by Vinod Koul
parent 7ac92262e1
commit 885525c1e7
2 changed files with 45 additions and 1 deletions
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35
drivers/clk/renesas/r9a06g032-clocks.c
View File

@ -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[] = {

11
include/linux/soc/renesas/r9a06g032-sysctrl.h Normal file
View File

@ -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__ */