From 6bb15d6f07a8348cca07f2f245f3025cb79e7680 Mon Sep 17 00:00:00 2001 From: Lukasz Majewski Date: Mon, 24 Jun 2019 15:50:48 +0200 Subject: [PATCH] clk: sandbox: Adjust clk-divider to emulate reading its value from HW The generic divider clock code for CCF requires reading the divider value from HW registers. As sandbox by design has readl() as no-op it was necessary to provide this value in the other way. The new field in the divider structure (accessible only when sandbox is run) has been introduced for this purpose. Signed-off-by: Lukasz Majewski --- drivers/clk/clk-divider.c | 10 +++++++++- include/linux/clk-provider.h | 3 +++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index 3348d97829..6921c76a48 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -74,7 +74,12 @@ static ulong clk_divider_recalc_rate(struct clk *clk) unsigned long parent_rate = clk_get_parent_rate(clk); unsigned int val; - val = readl(divider->reg) >> divider->shift; +#if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF) + val = divider->io_divider_val; +#else + val = readl(divider->reg); +#endif + val >>= divider->shift; val &= clk_div_mask(divider->width); return divider_recalc_rate(clk, parent_rate, val, divider->table, @@ -112,6 +117,9 @@ static struct clk *_register_divider(struct device *dev, const char *name, div->width = width; div->flags = clk_divider_flags; div->table = table; +#if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF) + div->io_divider_val = *(u32 *)reg; +#endif /* register the clock */ clk = &div->clk; diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h index e06487f07b..53c9c41b90 100644 --- a/include/linux/clk-provider.h +++ b/include/linux/clk-provider.h @@ -75,6 +75,9 @@ struct clk_divider { u8 width; u8 flags; const struct clk_div_table *table; +#if CONFIG_IS_ENABLED(SANDBOX_CLK_CCF) + u32 io_divider_val; +#endif }; #define clk_div_mask(width) ((1 << (width)) - 1) -- 2.25.1