linux/drivers/clk/ti/autoidle.c
Tero Kristo 6c0afb5039 clk: ti: convert to use proper register definition for all accesses
Currently, TI clock driver uses an encapsulated struct that is cast into
a void pointer to store all register addresses. This can be considered
as rather nasty hackery, and prevents from expanding the register
address field also. Instead, replace all the code to use proper struct
in place for this, which contains all the previously used data.

This patch is rather large as it is touching multiple files, but this
can't be split up as we need to avoid any boot breakage.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
2017-03-08 13:06:15 +02:00

233 lines
5.4 KiB
C

/*
* 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>
#include "clock.h"
struct clk_ti_autoidle {
struct clk_omap_reg reg;
u8 shift;
u8 flags;
const char *name;
struct list_head node;
};
#define AUTOIDLE_LOW 0x1
static LIST_HEAD(autoidle_clks);
static LIST_HEAD(clk_hw_omap_clocks);
/**
* omap2_clk_deny_idle - disable autoidle on an OMAP clock
* @clk: struct clk * to disable autoidle for
*
* Disable autoidle on an OMAP clock.
*/
int omap2_clk_deny_idle(struct clk *clk)
{
struct clk_hw_omap *c;
c = to_clk_hw_omap(__clk_get_hw(clk));
if (c->ops && c->ops->deny_idle)
c->ops->deny_idle(c);
return 0;
}
/**
* omap2_clk_allow_idle - enable autoidle on an OMAP clock
* @clk: struct clk * to enable autoidle for
*
* Enable autoidle on an OMAP clock.
*/
int omap2_clk_allow_idle(struct clk *clk)
{
struct clk_hw_omap *c;
c = to_clk_hw_omap(__clk_get_hw(clk));
if (c->ops && c->ops->allow_idle)
c->ops->allow_idle(c);
return 0;
}
static void _allow_autoidle(struct clk_ti_autoidle *clk)
{
u32 val;
val = ti_clk_ll_ops->clk_readl(&clk->reg);
if (clk->flags & AUTOIDLE_LOW)
val &= ~(1 << clk->shift);
else
val |= (1 << clk->shift);
ti_clk_ll_ops->clk_writel(val, &clk->reg);
}
static void _deny_autoidle(struct clk_ti_autoidle *clk)
{
u32 val;
val = ti_clk_ll_ops->clk_readl(&clk->reg);
if (clk->flags & AUTOIDLE_LOW)
val |= (1 << clk->shift);
else
val &= ~(1 << clk->shift);
ti_clk_ll_ops->clk_writel(val, &clk->reg);
}
/**
* _clk_generic_allow_autoidle_all - enable autoidle for all clocks
*
* Enables hardware autoidle for all registered DT clocks, which have
* the feature.
*/
static void _clk_generic_allow_autoidle_all(void)
{
struct clk_ti_autoidle *c;
list_for_each_entry(c, &autoidle_clks, node)
_allow_autoidle(c);
}
/**
* _clk_generic_deny_autoidle_all - disable autoidle for all clocks
*
* Disables hardware autoidle for all registered DT clocks, which have
* the feature.
*/
static void _clk_generic_deny_autoidle_all(void)
{
struct clk_ti_autoidle *c;
list_for_each_entry(c, &autoidle_clks, node)
_deny_autoidle(c);
}
/**
* of_ti_clk_autoidle_setup - sets up hardware autoidle for a clock
* @node: pointer to the clock device node
*
* Checks if a clock has hardware autoidle support or not (check
* for presence of 'ti,autoidle-shift' property in the device tree
* node) and sets up the hardware autoidle feature for the clock
* if available. If autoidle is available, the clock is also added
* to the autoidle list for later processing. Returns 0 on success,
* negative error value on failure.
*/
int __init of_ti_clk_autoidle_setup(struct device_node *node)
{
u32 shift;
struct clk_ti_autoidle *clk;
int ret;
/* Check if this clock has autoidle support or not */
if (of_property_read_u32(node, "ti,autoidle-shift", &shift))
return 0;
clk = kzalloc(sizeof(*clk), GFP_KERNEL);
if (!clk)
return -ENOMEM;
clk->shift = shift;
clk->name = node->name;
ret = ti_clk_get_reg_addr(node, 0, &clk->reg);
if (ret) {
kfree(clk);
return ret;
}
if (of_property_read_bool(node, "ti,invert-autoidle-bit"))
clk->flags |= AUTOIDLE_LOW;
list_add(&clk->node, &autoidle_clks);
return 0;
}
/**
* omap2_init_clk_hw_omap_clocks - initialize an OMAP clock
* @hw: struct clk_hw * to initialize
*
* Add an OMAP clock @clk to the internal list of OMAP clocks. Used
* temporarily for autoidle handling, until this support can be
* integrated into the common clock framework code in some way. No
* return value.
*/
void omap2_init_clk_hw_omap_clocks(struct clk_hw *hw)
{
struct clk_hw_omap *c;
if (clk_hw_get_flags(hw) & CLK_IS_BASIC)
return;
c = to_clk_hw_omap(hw);
list_add(&c->node, &clk_hw_omap_clocks);
}
/**
* omap2_clk_enable_autoidle_all - enable autoidle on all OMAP clocks that
* support it
*
* Enable clock autoidle on all OMAP clocks that have allow_idle
* function pointers associated with them. This function is intended
* to be temporary until support for this is added to the common clock
* code. Returns 0.
*/
int omap2_clk_enable_autoidle_all(void)
{
struct clk_hw_omap *c;
list_for_each_entry(c, &clk_hw_omap_clocks, node)
if (c->ops && c->ops->allow_idle)
c->ops->allow_idle(c);
_clk_generic_allow_autoidle_all();
return 0;
}
/**
* omap2_clk_disable_autoidle_all - disable autoidle on all OMAP clocks that
* support it
*
* Disable clock autoidle on all OMAP clocks that have allow_idle
* function pointers associated with them. This function is intended
* to be temporary until support for this is added to the common clock
* code. Returns 0.
*/
int omap2_clk_disable_autoidle_all(void)
{
struct clk_hw_omap *c;
list_for_each_entry(c, &clk_hw_omap_clocks, node)
if (c->ops && c->ops->deny_idle)
c->ops->deny_idle(c);
_clk_generic_deny_autoidle_all();
return 0;
}