[PATCHv8 03/36] CLK: TI: add autoidle support
From: Tero Kristo <hidden>
Date: 2013-10-09 15:30:34
Also in:
linux-devicetree, linux-omap
Subsystem:
arm port, common clk framework, omap clock framework support, omap2+ support, the rest, ti clock driver · Maintainers:
Russell King, Michael Turquette, Stephen Boyd, Paul Walmsley, Aaro Koskinen, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds, Tero Kristo
TI clk driver now routes some of the basic clocks through own registration routine to allow autoidle support. This routine just checks a couple of device node properties and adds autoidle support if required, and just passes the registration forward to basic clocks. Signed-off-by: Tero Kristo <redacted> Tested-by: Nishanth Menon <nm@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> --- arch/arm/mach-omap2/clock.c | 6 +++ drivers/clk/ti/Makefile | 2 +- drivers/clk/ti/autoidle.c | 107 +++++++++++++++++++++++++++++++++++++++++++ include/linux/clk/ti.h | 9 ++++ 4 files changed, 123 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/ti/autoidle.c
diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 0c38ca9..223f432b 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c@@ -520,6 +520,9 @@ int omap2_clk_enable_autoidle_all(void) list_for_each_entry(c, &clk_hw_omap_clocks, node) if (c->ops && c->ops->allow_idle) c->ops->allow_idle(c); + + of_ti_clk_allow_autoidle_all(); + return 0; }
@@ -539,6 +542,9 @@ int omap2_clk_disable_autoidle_all(void) list_for_each_entry(c, &clk_hw_omap_clocks, node) if (c->ops && c->ops->deny_idle) c->ops->deny_idle(c); + + of_ti_clk_deny_autoidle_all(); + return 0; }
diff --git a/drivers/clk/ti/Makefile b/drivers/clk/ti/Makefile
index 05af5d8..533efb4 100644
--- a/drivers/clk/ti/Makefile
+++ b/drivers/clk/ti/Makefile@@ -1,3 +1,3 @@ ifneq ($(CONFIG_OF),) -obj-y += clk.o dpll.o +obj-y += clk.o dpll.o autoidle.o endif
diff --git a/drivers/clk/ti/autoidle.c b/drivers/clk/ti/autoidle.c
new file mode 100644
index 0000000..ccac33c
--- /dev/null
+++ b/drivers/clk/ti/autoidle.c@@ -0,0 +1,107 @@ +/* + * TI clock autoidle support + * + * Copyright (C) 2013 Texas Instruments, Inc. + * + * Tero Kristo <t-kristo@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk-provider.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/clk/ti.h> + +struct clk_ti_autoidle { + void __iomem *reg; + u8 shift; + u8 flags; + const char *name; + struct list_head node; +}; + +#define AUTOIDLE_LOW 0x1 + +static LIST_HEAD(autoidle_clks); + +static void ti_allow_autoidle(struct clk_ti_autoidle *clk) +{ + u32 val; + + val = readl(clk->reg); + + if (clk->flags & AUTOIDLE_LOW) + val &= ~(1 << clk->shift); + else + val |= (1 << clk->shift); + + writel(val, clk->reg); +} + +static void ti_deny_autoidle(struct clk_ti_autoidle *clk) +{ + u32 val; + + val = readl(clk->reg); + + if (clk->flags & AUTOIDLE_LOW) + val |= (1 << clk->shift); + else + val &= ~(1 << clk->shift); + + writel(val, clk->reg); +} + +void of_ti_clk_allow_autoidle_all(void) +{ + struct clk_ti_autoidle *c; + + list_for_each_entry(c, &autoidle_clks, node) + ti_allow_autoidle(c); +} + +void of_ti_clk_deny_autoidle_all(void) +{ + struct clk_ti_autoidle *c; + + list_for_each_entry(c, &autoidle_clks, node) + ti_deny_autoidle(c); +} + +void __init of_ti_autoidle_setup(struct device_node *node) +{ + u32 shift; + void __iomem *reg; + struct clk_ti_autoidle *clk; + + if (of_property_read_u32(node, "ti,autoidle-shift", &shift)) + return; + + reg = of_iomap(node, 0); + + clk = kzalloc(sizeof(*clk), GFP_KERNEL); + + if (!clk) { + pr_err("%s: kzalloc failed\n", __func__); + return; + } + + clk->shift = shift; + clk->name = node->name; + clk->reg = reg; + + if (of_property_read_bool(node, "ti,autoidle-low")) + clk->flags |= AUTOIDLE_LOW; + + list_add(&clk->node, &autoidle_clks); +}
diff --git a/include/linux/clk/ti.h b/include/linux/clk/ti.h
index c89574e..6d552c1 100644
--- a/include/linux/clk/ti.h
+++ b/include/linux/clk/ti.h@@ -180,6 +180,15 @@ int omap3_dpll4_set_rate(struct clk_hw *clk, unsigned long rate, unsigned long parent_rate); void ti_dt_clocks_register(struct ti_dt_clk *oclks); +void of_ti_autoidle_setup(struct device_node *node); + +#ifdef CONFIG_OF +void of_ti_clk_allow_autoidle_all(void); +void of_ti_clk_deny_autoidle_all(void); +#else +static inline void of_ti_clk_allow_autoidle_all(void) { } +static inline void of_ti_clk_deny_autoidle_all(void) { } +#endif extern const struct clk_hw_omap_ops clkhwops_omap3_dpll; extern const struct clk_hw_omap_ops clkhwops_omap4_dpllmx;
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1.7.9.5