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clk: sunxi: Rework clock protection code 

Since we start to have a lot of clocks to protect, some of them in a
few SoCs only, it becomes difficult to handle the clock protection
without having to add per machine exceptions.

Add per-SoC data to tell which clock to leave enabled.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Emilio López <emilio@elopez.com.ar>
This commit is contained in:
Maxime Ripard 2014-05-09 22:33:39 -05:00
parent 59cb10e32a
commit 134a6690a3
1 changed files with 44 additions and 28 deletions
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72
drivers/clk/sunxi/clk-sunxi.c
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@ -1172,29 +1172,10 @@ static void __init of_sunxi_table_clock_setup(const struct of_device_id *clk_mat
}
}
/**
* System clock protection
*
* By enabling these critical clocks, we prevent their accidental gating
* by the framework
*/
static void __init sunxi_clock_protect(void)
static void __init sunxi_init_clocks(const char *clocks[], int nclocks)
{
struct clk *clk;
unsigned int i;
/* memory bus clock - sun5i+ */
clk = clk_get(NULL, "mbus");
if (!IS_ERR(clk))
clk_prepare_enable(clk);
/* DDR clock - sun4i+ */
clk = clk_get(NULL, "pll5_ddr");
if (!IS_ERR(clk))
clk_prepare_enable(clk);
}
static void __init sunxi_init_clocks(struct device_node *np)
{
/* Register factor clocks */
of_sunxi_table_clock_setup(clk_factors_match, sunxi_factors_clk_setup);
@ -1210,11 +1191,46 @@ static void __init sunxi_init_clocks(struct device_node *np)
/* Register gate clocks */
of_sunxi_table_clock_setup(clk_gates_match, sunxi_gates_clk_setup);
/* Enable core system clocks */
sunxi_clock_protect();
/* Protect the clocks that needs to stay on */
for (i = 0; i < nclocks; i++) {
struct clk *clk = clk_get(NULL, clocks[i]);
if (!IS_ERR(clk))
clk_prepare_enable(clk);
}
}
CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sunxi_init_clocks);
CLK_OF_DECLARE(sun5i_a10s_clk_init, "allwinner,sun5i-a10s", sunxi_init_clocks);
CLK_OF_DECLARE(sun5i_a13_clk_init, "allwinner,sun5i-a13", sunxi_init_clocks);
CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sunxi_init_clocks);
CLK_OF_DECLARE(sun7i_a20_clk_init, "allwinner,sun7i-a20", sunxi_init_clocks);
static const char *sun4i_a10_critical_clocks[] __initdata = {
"pll5_ddr",
};
static void __init sun4i_a10_init_clocks(struct device_node *node)
{
sunxi_init_clocks(sun4i_a10_critical_clocks,
ARRAY_SIZE(sun4i_a10_critical_clocks));
}
CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sun4i_a10_init_clocks);
static const char *sun5i_critical_clocks[] __initdata = {
"mbus",
"pll5_ddr",
};
static void __init sun5i_init_clocks(struct device_node *node)
{
sunxi_init_clocks(sun5i_critical_clocks,
ARRAY_SIZE(sun5i_critical_clocks));
}
CLK_OF_DECLARE(sun5i_a10s_clk_init, "allwinner,sun5i-a10s", sun5i_init_clocks);
CLK_OF_DECLARE(sun5i_a13_clk_init, "allwinner,sun5i-a13", sun5i_init_clocks);
CLK_OF_DECLARE(sun7i_a20_clk_init, "allwinner,sun7i-a20", sun5i_init_clocks);
static const char *sun6i_critical_clocks[] __initdata = {
};
static void __init sun6i_init_clocks(struct device_node *node)
{
sunxi_init_clocks(sun6i_critical_clocks,
ARRAY_SIZE(sun6i_critical_clocks));
}
CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sun6i_init_clocks);