CLK: TI: add autoidle support
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 <t-kristo@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
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Documentation/devicetree/bindings/clock/ti/autoidle.txt
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Documentation/devicetree/bindings/clock/ti/autoidle.txt
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@ -0,0 +1,39 @@
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Binding for Texas Instruments autoidle clock.
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Binding status: Unstable - ABI compatibility may be broken in the future
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This binding uses the common clock binding[1]. It assumes a register mapped
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clock which can be put to idle automatically by hardware based on the usage
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and a configuration bit setting. Autoidle clock is never an individual
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clock, it is always a derivative of some basic clock like a gate, divider,
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or fixed-factor.
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[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
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Required properties:
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- reg : offset for the register controlling the autoidle
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- ti,autoidle-shift : bit shift of the autoidle enable bit
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- ti,invert-autoidle-bit : autoidle is enabled by setting the bit to 0
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Examples:
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dpll_core_m4_ck: dpll_core_m4_ck {
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#clock-cells = <0>;
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compatible = "ti,divider-clock";
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clocks = <&dpll_core_x2_ck>;
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ti,max-div = <31>;
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ti,autoidle-shift = <8>;
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reg = <0x2d38>;
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ti,index-starts-at-one;
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ti,invert-autoidle-bit;
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};
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dpll_usb_clkdcoldo_ck: dpll_usb_clkdcoldo_ck {
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#clock-cells = <0>;
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compatible = "ti,fixed-factor-clock";
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clocks = <&dpll_usb_ck>;
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ti,clock-div = <1>;
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ti,autoidle-shift = <8>;
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reg = <0x01b4>;
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ti,clock-mult = <1>;
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ti,invert-autoidle-bit;
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};
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@ -520,6 +520,9 @@ int omap2_clk_enable_autoidle_all(void)
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list_for_each_entry(c, &clk_hw_omap_clocks, node)
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list_for_each_entry(c, &clk_hw_omap_clocks, node)
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if (c->ops && c->ops->allow_idle)
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if (c->ops && c->ops->allow_idle)
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c->ops->allow_idle(c);
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c->ops->allow_idle(c);
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of_ti_clk_allow_autoidle_all();
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return 0;
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return 0;
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}
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}
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@ -539,6 +542,9 @@ int omap2_clk_disable_autoidle_all(void)
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list_for_each_entry(c, &clk_hw_omap_clocks, node)
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list_for_each_entry(c, &clk_hw_omap_clocks, node)
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if (c->ops && c->ops->deny_idle)
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if (c->ops && c->ops->deny_idle)
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c->ops->deny_idle(c);
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c->ops->deny_idle(c);
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of_ti_clk_deny_autoidle_all();
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return 0;
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return 0;
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}
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}
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@ -1,4 +1,4 @@
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ifneq ($(CONFIG_OF),)
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ifneq ($(CONFIG_OF),)
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obj-y += clk.o
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obj-y += clk.o autoidle.o
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clk-common = dpll.o
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clk-common = dpll.o
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endif
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endif
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133
drivers/clk/ti/autoidle.c
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drivers/clk/ti/autoidle.c
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/*
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* TI clock autoidle support
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*
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* Copyright (C) 2013 Texas Instruments, Inc.
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*
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* Tero Kristo <t-kristo@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/clk/ti.h>
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struct clk_ti_autoidle {
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void __iomem *reg;
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u8 shift;
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u8 flags;
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const char *name;
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struct list_head node;
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};
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#define AUTOIDLE_LOW 0x1
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static LIST_HEAD(autoidle_clks);
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static void ti_allow_autoidle(struct clk_ti_autoidle *clk)
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{
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u32 val;
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val = ti_clk_ll_ops->clk_readl(clk->reg);
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if (clk->flags & AUTOIDLE_LOW)
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val &= ~(1 << clk->shift);
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else
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val |= (1 << clk->shift);
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ti_clk_ll_ops->clk_writel(val, clk->reg);
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}
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static void ti_deny_autoidle(struct clk_ti_autoidle *clk)
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{
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u32 val;
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val = ti_clk_ll_ops->clk_readl(clk->reg);
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if (clk->flags & AUTOIDLE_LOW)
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val |= (1 << clk->shift);
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else
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val &= ~(1 << clk->shift);
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ti_clk_ll_ops->clk_writel(val, clk->reg);
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}
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/**
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* of_ti_clk_allow_autoidle_all - enable autoidle for all clocks
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*
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* Enables hardware autoidle for all registered DT clocks, which have
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* the feature.
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*/
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void of_ti_clk_allow_autoidle_all(void)
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{
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struct clk_ti_autoidle *c;
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list_for_each_entry(c, &autoidle_clks, node)
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ti_allow_autoidle(c);
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}
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/**
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* of_ti_clk_deny_autoidle_all - disable autoidle for all clocks
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*
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* Disables hardware autoidle for all registered DT clocks, which have
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* the feature.
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*/
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void of_ti_clk_deny_autoidle_all(void)
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{
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struct clk_ti_autoidle *c;
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list_for_each_entry(c, &autoidle_clks, node)
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ti_deny_autoidle(c);
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}
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/**
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* of_ti_clk_autoidle_setup - sets up hardware autoidle for a clock
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* @node: pointer to the clock device node
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*
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* Checks if a clock has hardware autoidle support or not (check
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* for presence of 'ti,autoidle-shift' property in the device tree
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* node) and sets up the hardware autoidle feature for the clock
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* if available. If autoidle is available, the clock is also added
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* to the autoidle list for later processing. Returns 0 on success,
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* negative error value on failure.
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*/
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int __init of_ti_clk_autoidle_setup(struct device_node *node)
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{
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u32 shift;
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struct clk_ti_autoidle *clk;
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/* Check if this clock has autoidle support or not */
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if (of_property_read_u32(node, "ti,autoidle-shift", &shift))
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return 0;
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clk = kzalloc(sizeof(*clk), GFP_KERNEL);
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if (!clk)
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return -ENOMEM;
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clk->shift = shift;
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clk->name = node->name;
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clk->reg = ti_clk_get_reg_addr(node, 0);
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if (!clk->reg) {
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kfree(clk);
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return -EINVAL;
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}
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if (of_property_read_bool(node, "ti,invert-autoidle-bit"))
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clk->flags |= AUTOIDLE_LOW;
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list_add(&clk->node, &autoidle_clks);
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return 0;
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}
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@ -242,6 +242,15 @@ void ti_dt_clocks_register(struct ti_dt_clk *oclks);
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void ti_dt_clk_init_provider(struct device_node *np, int index);
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void ti_dt_clk_init_provider(struct device_node *np, int index);
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int ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
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int ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
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ti_of_clk_init_cb_t func);
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ti_of_clk_init_cb_t func);
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int of_ti_clk_autoidle_setup(struct device_node *node);
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#ifdef CONFIG_OF
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void of_ti_clk_allow_autoidle_all(void);
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void of_ti_clk_deny_autoidle_all(void);
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#else
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static inline void of_ti_clk_allow_autoidle_all(void) { }
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static inline void of_ti_clk_deny_autoidle_all(void) { }
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#endif
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extern const struct clk_hw_omap_ops clkhwops_omap3_dpll;
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extern const struct clk_hw_omap_ops clkhwops_omap3_dpll;
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extern const struct clk_hw_omap_ops clkhwops_omap4_dpllmx;
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extern const struct clk_hw_omap_ops clkhwops_omap4_dpllmx;
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