Re: [PATCH v2 2/3] ARM: EXYNOS: Add initial support of PMU for Exynos5260

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Hi Vikas,

On 17.03.2014 14:09, Vikas Sajjan wrote:
Adds PMU support of PMU for Exynos5260. Suspend-to-RAM can be built on
top this.

Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx>
Signed-off-by: Vikas Sajjan <vikas.sajjan@xxxxxxxxxxx>
---
  arch/arm/mach-exynos/common.h            |   26 ++++
  arch/arm/mach-exynos/pm.c                |   34 +++--
  arch/arm/mach-exynos/pmu.c               |  238 ++++++++++++++++++++++++++++++
  arch/arm/mach-exynos/regs-pmu.h          |  232 +++++++++++++++++++++++++++++
  arch/arm/plat-samsung/include/plat/cpu.h |    8 +
  5 files changed, 529 insertions(+), 9 deletions(-)

diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index aba6a2a..a17f701 100644
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -56,6 +56,32 @@ enum sys_powerdown {
  	NUM_SYS_POWERDOWN,
  };

+enum running_cpu {
+	EXYNOS5_KFC,
+	EXYNOS5_ARM,
+};
+
+enum reg_op {
+	REG_INIT,	/* write new value */
+	REG_RESET,	/* clear with zero */
+	REG_SET,	/* bit set */
+	REG_CLEAR,	/* bit clear */
+};
+
+/* reg/value set */
+#define EXYNOS_PMU_REG(REG, VAL, OP)		\
+{						\
+	.reg	=	(void __iomem *)REG,	\
+	.val	=	VAL,			\
+	.op	=	OP,			\
+}
+
+struct exynos_pmu_init_reg {
+	void __iomem *reg;
+	unsigned int val;
+	enum reg_op op;
+};
+
  extern unsigned long l2x0_regs_phys;
  struct exynos_pmu_conf {
  	void __iomem *reg;
diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c
index 15af0ce..dbe9670 100644
--- a/arch/arm/mach-exynos/pm.c
+++ b/arch/arm/mach-exynos/pm.c
@@ -109,7 +109,7 @@ static int exynos_cpu_suspend(unsigned long arg)
  	outer_flush_all();
  #endif

-	if (soc_is_exynos5250())
+	if (soc_is_exynos5250() || soc_is_exynos5260())
  		flush_cache_all();

I think it's the right time for this code to be restructured. Adding more and more SoCs over this cruft is making this code worse and worse.

I believe this should be done as follows:

- a generic struct describing particular PMU variant should be defined, with things like

	bool flush_cache_on_suspend;
	struct exynos_pmu_conf *pmu_conf;

or even function pointers, like

	void (*cpu_suspend)(unsigned long arg);

to handle things done currently using soc_is_*() macros, which we should get rid of.

- a DT match table would bind particular compatible strings with respective PMU variants structs,

- in general, this code should be made more like a normal driver, e.g. bind to a DT node and map registers dynamically.

Best regards,
Tomasz
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