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openwrtv4/target/linux/ath79/patches-4.14/0028-MIPS-ath79-add-helpers-for-setting-clocks-and-expose.patch
John Crispin 53c474abbd ath79: add new OF only target for QCA MIPS silicon 
This target aims to replace ar71xx mid-term. The big part that is still
missing is making the MMIO/AHB wifi work using OF. NAND and mikrotik
subtargets will follow.

Signed-off-by: John Crispin <john@phrozen.org>
2018-05-07 08:06:51 +02:00

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From: Felix Fietkau <nbd@nbd.name>
Date: Tue, 6 Mar 2018 13:19:26 +0100
Subject: [PATCH] MIPS: ath79: add helpers for setting clocks and expose
the ref clock
Preparation for transitioning legacy the legacy clock setup code over
to OF.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
--- a/arch/mips/ath79/clock.c
+++ b/arch/mips/ath79/clock.c
@@ -36,20 +36,46 @@ 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;
}
@@ -79,27 +105,15 @@ static void __init ar71xx_clocks_init(vo
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;
@@ -113,24 +127,19 @@ static void __init ar724x_clk_init(struc
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);
}
@@ -185,12 +194,12 @@ static void __init ar9330_clk_init(struc
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)
@@ -205,15 +214,10 @@ static void __init ar933x_clocks_init(vo
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);
}
@@ -343,10 +347,10 @@ static void __init ar934x_clocks_init(vo
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);
@@ -430,10 +434,10 @@ static void __init qca953x_clocks_init(v
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);
@@ -515,10 +519,10 @@ static void __init qca955x_clocks_init(v
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);
@@ -609,10 +613,10 @@ static void __init qca956x_clocks_init(v
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);
--- a/include/dt-bindings/clock/ath79-clk.h
+++ b/include/dt-bindings/clock/ath79-clk.h
@@ -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 */
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