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MIPS: ath79: add helpers for setting clocks and expose the ref clock 

Preparation for transitioning the legacy clock setup code over
to OF.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: John Crispin <john@phrozen.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
This commit is contained in:
Felix Fietkau 2019-01-11 15:22:30 +01:00 committed by Paul Burton
parent 7b3415f581
commit 9b56e0d0cc
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
2 changed files with 68 additions and 63 deletions
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128
arch/mips/ath79/clock.c
View File

@ -37,20 +37,46 @@ static struct clk_onecell_data clk_data = {
.clk_num = ARRAY_SIZE(clks),
};
static struct clk *__init ath79_add_sys_clkdev(
const char *id, unsigned long rate)
static const char * const clk_names[ATH79_CLK_END] = {
[ATH79_CLK_CPU] = "cpu",
[ATH79_CLK_DDR] = "ddr",
[ATH79_CLK_AHB] = "ahb",
[ATH79_CLK_REF] = "ref",
};
static const char * __init ath79_clk_name(int type)
{
struct clk *clk;
int err;
BUG_ON(type >= ARRAY_SIZE(clk_names) || !clk_names[type]);
return clk_names[type];
}
clk = clk_register_fixed_rate(NULL, id, NULL, 0, rate);
static void __init __ath79_set_clk(int type, const char *name, struct clk *clk)
{
if (IS_ERR(clk))
panic("failed to allocate %s clock structure", id);
panic("failed to allocate %s clock structure", clk_names[type]);
err = clk_register_clkdev(clk, id, NULL);
if (err)
panic("unable to register %s clock device", id);
clks[type] = clk;
clk_register_clkdev(clk, name, NULL);
}
static struct clk * __init ath79_set_clk(int type, unsigned long rate)
{
const char *name = ath79_clk_name(type);
struct clk *clk;
clk = clk_register_fixed_rate(NULL, name, NULL, 0, rate);
__ath79_set_clk(type, name, clk);
return clk;
}
static struct clk * __init ath79_set_ff_clk(int type, const char *parent,
unsigned int mult, unsigned int div)
{
const char *name = ath79_clk_name(type);
struct clk *clk;
clk = clk_register_fixed_factor(NULL, name, parent, 0, mult, div);
__ath79_set_clk(type, name, clk);
return clk;
}
@ -80,27 +106,15 @@ static void __init ar71xx_clocks_init(void)
div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
ahb_rate = cpu_rate / div;
ath79_add_sys_clkdev("ref", ref_rate);
clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
ath79_set_clk(ATH79_CLK_REF, ref_rate);
ath79_set_clk(ATH79_CLK_CPU, cpu_rate);
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ahb", NULL);
}
static struct clk * __init ath79_reg_ffclk(const char *name,
const char *parent_name, unsigned int mult, unsigned int div)
{
struct clk *clk;
clk = clk_register_fixed_factor(NULL, name, parent_name, 0, mult, div);
if (IS_ERR(clk))
panic("failed to allocate %s clock structure", name);
return clk;
}
static void __init ar724x_clk_init(struct clk *ref_clk, void __iomem *pll_base)
{
u32 pll;
@ -114,24 +128,19 @@ static void __init ar724x_clk_init(struct clk *ref_clk, void __iomem *pll_base)
ddr_div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
ahb_div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
clks[ATH79_CLK_CPU] = ath79_reg_ffclk("cpu", "ref", mult, div);
clks[ATH79_CLK_DDR] = ath79_reg_ffclk("ddr", "ref", mult, div * ddr_div);
clks[ATH79_CLK_AHB] = ath79_reg_ffclk("ahb", "ref", mult, div * ahb_div);
ath79_set_ff_clk(ATH79_CLK_CPU, "ref", mult, div);
ath79_set_ff_clk(ATH79_CLK_DDR, "ref", mult, div * ddr_div);
ath79_set_ff_clk(ATH79_CLK_AHB, "ref", mult, div * ahb_div);
}
static void __init ar724x_clocks_init(void)
{
struct clk *ref_clk;
ref_clk = ath79_add_sys_clkdev("ref", AR724X_BASE_FREQ);
ref_clk = ath79_set_clk(ATH79_CLK_REF, AR724X_BASE_FREQ);
ar724x_clk_init(ref_clk, ath79_pll_base);
/* just make happy plat_time_init() from arch/mips/ath79/setup.c */
clk_register_clkdev(clks[ATH79_CLK_CPU], "cpu", NULL);
clk_register_clkdev(clks[ATH79_CLK_DDR], "ddr", NULL);
clk_register_clkdev(clks[ATH79_CLK_AHB], "ahb", NULL);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ahb", NULL);
}
@ -186,12 +195,12 @@ static void __init ar9330_clk_init(struct clk *ref_clk, void __iomem *pll_base)
AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1;
}
clks[ATH79_CLK_CPU] = ath79_reg_ffclk("cpu", "ref",
ninit_mul, ref_div * out_div * cpu_div);
clks[ATH79_CLK_DDR] = ath79_reg_ffclk("ddr", "ref",
ninit_mul, ref_div * out_div * ddr_div);
clks[ATH79_CLK_AHB] = ath79_reg_ffclk("ahb", "ref",
ninit_mul, ref_div * out_div * ahb_div);
ath79_set_ff_clk(ATH79_CLK_CPU, "ref", ninit_mul,
ref_div * out_div * cpu_div);
ath79_set_ff_clk(ATH79_CLK_DDR, "ref", ninit_mul,
ref_div * out_div * ddr_div);
ath79_set_ff_clk(ATH79_CLK_AHB, "ref", ninit_mul,
ref_div * out_div * ahb_div);
}
static void __init ar933x_clocks_init(void)
@ -206,15 +215,10 @@ static void __init ar933x_clocks_init(void)
else
ref_rate = (25 * 1000 * 1000);
ref_clk = ath79_add_sys_clkdev("ref", ref_rate);
ref_clk = ath79_set_clk(ATH79_CLK_REF, ref_rate);
ar9330_clk_init(ref_clk, ath79_pll_base);
/* just make happy plat_time_init() from arch/mips/ath79/setup.c */
clk_register_clkdev(clks[ATH79_CLK_CPU], "cpu", NULL);
clk_register_clkdev(clks[ATH79_CLK_DDR], "ddr", NULL);
clk_register_clkdev(clks[ATH79_CLK_AHB], "ahb", NULL);
clk_add_alias("wdt", NULL, "ahb", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
}
@ -344,10 +348,10 @@ static void __init ar934x_clocks_init(void)
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
ath79_set_clk(ATH79_CLK_REF, ref_rate);
ath79_set_clk(ATH79_CLK_CPU, cpu_rate);
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
@ -431,10 +435,10 @@ static void __init qca953x_clocks_init(void)
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
ath79_set_clk(ATH79_CLK_REF, ref_rate);
ath79_set_clk(ATH79_CLK_CPU, cpu_rate);
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
@ -516,10 +520,10 @@ static void __init qca955x_clocks_init(void)
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
ath79_set_clk(ATH79_CLK_REF, ref_rate);
ath79_set_clk(ATH79_CLK_CPU, cpu_rate);
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);
@ -620,10 +624,10 @@ static void __init qca956x_clocks_init(void)
else
ahb_rate = cpu_pll / (postdiv + 1);
ath79_add_sys_clkdev("ref", ref_rate);
ath79_add_sys_clkdev("cpu", cpu_rate);
ath79_add_sys_clkdev("ddr", ddr_rate);
ath79_add_sys_clkdev("ahb", ahb_rate);
ath79_set_clk(ATH79_CLK_REF, ref_rate);
ath79_set_clk(ATH79_CLK_CPU, cpu_rate);
ath79_set_clk(ATH79_CLK_DDR, ddr_rate);
ath79_set_clk(ATH79_CLK_AHB, ahb_rate);
clk_add_alias("wdt", NULL, "ref", NULL);
clk_add_alias("uart", NULL, "ref", NULL);

3
include/dt-bindings/clock/ath79-clk.h
View File

@ -13,7 +13,8 @@
#define ATH79_CLK_CPU 0
#define ATH79_CLK_DDR 1
#define ATH79_CLK_AHB 2
#define ATH79_CLK_REF 3
#define ATH79_CLK_END 3
#define ATH79_CLK_END 4
#endif /* __DT_BINDINGS_ATH79_CLK_H */