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Commit 3ccefbd2 authored by Tomasz Figa's avatar Tomasz Figa Committed by Kukjin Kim
Browse files

clk: samsung: Provide common helpers for register save/restore 



As suspend/resume handlers are being moved to SoC specific code, due to
differencies in suspend/resume handling of particular SoCs, to minimize
code duplication this patch provides common register save/restore
helpers that save/restore given list of registers of clock controller.

Signed-off-by: default avatarTomasz Figa <t.figa@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Acked-by: default avatarHeiko Stuebner <heiko@sntech.de>
Reviewed-by: default avatarThomas Abraham <thomas.ab@samsung.com>
Reviewed-by: default avatarSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 442f4948

drivers/clk/samsung/clk.c

+32 −0
Original line number Diff line number Diff line
@@ -22,6 +22,38 @@ static struct clk_onecell_data clk_data; 
#endif



#ifdef CONFIG_PM_SLEEP

void samsung_clk_save(void __iomem *base,

				    struct samsung_clk_reg_dump *rd,

				    unsigned int num_regs)

{

	for (; num_regs > 0; --num_regs, ++rd)

		rd->value = readl(base + rd->offset);

}



void samsung_clk_restore(void __iomem *base,

				      const struct samsung_clk_reg_dump *rd,

				      unsigned int num_regs)

{

	for (; num_regs > 0; --num_regs, ++rd)

		writel(rd->value, base + rd->offset);

}



struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(unsigned long *rdump,

							unsigned long nr_rdump)

{

	struct samsung_clk_reg_dump *rd;

	unsigned int i;



	rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);

	if (!rd)

		return NULL;



	for (i = 0; i < nr_rdump; ++i)

		rd[i].offset = rdump[i];



	return rd;

}



static struct samsung_clk_reg_dump *reg_dump;

static unsigned long nr_reg_dump;

drivers/clk/samsung/clk.h

+10 −0
Original line number Diff line number Diff line
@@ -340,4 +340,14 @@ extern void __init samsung_clk_register_pll(struct samsung_pll_clock *pll_list, 


extern unsigned long _get_rate(const char *clk_name);



extern void samsung_clk_save(void __iomem *base,

			     struct samsung_clk_reg_dump *rd,

			     unsigned int num_regs);

extern void samsung_clk_restore(void __iomem *base,

				const struct samsung_clk_reg_dump *rd,

				unsigned int num_regs);

extern struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(

							unsigned long *rdump,

							unsigned long nr_rdump);



#endif /* __SAMSUNG_CLK_H */