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ARM: OMAP2+: clock: add low-level support for regmap

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Some of the TI clock providers will be converted to use syscon, thus
low-level regmap support is needed for the clock drivers also. This
patch adds this support, which can be enabled for individual drivers
in later patches.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
This commit is contained in:
Tero Kristo 2015-02-06 16:00:32 +02:00
parent 219595b6ee
commit 80cbb224b7
5 changed files with 47 additions and 11 deletions
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48
arch/arm/mach-omap2/clock.c
View File

@ -23,7 +23,9 @@
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/of_address.h>
#include <linux/bootmem.h>
#include <asm/cpu.h>
#include <trace/events/power.h>
@ -73,20 +75,37 @@ struct ti_clk_features ti_clk_features;
static bool clkdm_control = true;
static LIST_HEAD(clk_hw_omap_clocks);
static void __iomem *clk_memmaps[CLK_MAX_MEMMAPS];
struct clk_iomap {
struct regmap *regmap;
void __iomem *mem;
};
static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
static void clk_memmap_writel(u32 val, void __iomem *reg)
{
struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
struct clk_iomap *io = clk_memmaps[r->index];
writel_relaxed(val, clk_memmaps[r->index] + r->offset);
if (io->regmap)
regmap_write(io->regmap, r->offset, val);
else
writel_relaxed(val, io->mem + r->offset);
}
static u32 clk_memmap_readl(void __iomem *reg)
{
u32 val;
struct clk_omap_reg *r = (struct clk_omap_reg *)&reg;
struct clk_iomap *io = clk_memmaps[r->index];
return readl_relaxed(clk_memmaps[r->index] + r->offset);
if (io->regmap)
regmap_read(io->regmap, r->offset, &val);
else
val = readl_relaxed(io->mem + r->offset);
return val;
}
void omap2_clk_writel(u32 val, struct clk_hw_omap *clk, void __iomem *reg)
@ -115,18 +134,27 @@ static struct ti_clk_ll_ops omap_clk_ll_ops = {
* @match_table: DT device table to match for devices to init
* @np: device node pointer for the this clock provider
* @index: index for the clock provider
* @mem: iomem pointer for the clock provider memory area
+ @syscon: syscon regmap pointer
* @mem: iomem pointer for the clock provider memory area, only used if
* syscon is not provided
*
* Initializes a clock provider module (CM/PRM etc.), registering
* the memory mapping at specified index and initializing the
* low level driver infrastructure. Returns 0 in success.
*/
int __init omap2_clk_provider_init(struct device_node *np, int index,
void __iomem *mem)
struct regmap *syscon, void __iomem *mem)
{
struct clk_iomap *io;
ti_clk_ll_ops = &omap_clk_ll_ops;
clk_memmaps[index] = mem;
io = kzalloc(sizeof(*io), GFP_KERNEL);
io->regmap = syscon;
io->mem = mem;
clk_memmaps[index] = io;
ti_dt_clk_init_provider(np, index);
@ -142,9 +170,15 @@ int __init omap2_clk_provider_init(struct device_node *np, int index,
*/
void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
{
struct clk_iomap *io;
ti_clk_ll_ops = &omap_clk_ll_ops;
clk_memmaps[index] = mem;
io = memblock_virt_alloc(sizeof(*io), 0);
io->mem = mem;
clk_memmaps[index] = io;
}
/*

4
arch/arm/mach-omap2/clock.h
View File

@ -274,8 +274,10 @@ extern const struct clksel_rate div31_1to31_rates[];
extern int omap2_clkops_enable_clkdm(struct clk_hw *hw);
extern void omap2_clkops_disable_clkdm(struct clk_hw *hw);
struct regmap;
int __init omap2_clk_provider_init(struct device_node *np, int index,
void __iomem *mem);
struct regmap *syscon, void __iomem *mem);
void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem);
void __init ti_clk_init_features(void);

2
arch/arm/mach-omap2/cm_common.c
View File

@ -361,7 +361,7 @@ int __init omap_cm_init(void)
if (data->flags & CM_NO_CLOCKS)
continue;
ret = omap2_clk_provider_init(np, data->index, data->mem);
ret = omap2_clk_provider_init(np, data->index, NULL, data->mem);
if (ret)
return ret;
}

2
arch/arm/mach-omap2/control.c
View File

@ -676,7 +676,7 @@ int __init omap_control_init(void)
for_each_matching_node_and_match(np, omap_scrm_dt_match_table, &match) {
data = match->data;
ret = omap2_clk_provider_init(np, data->index, data->mem);
ret = omap2_clk_provider_init(np, data->index, NULL, data->mem);
if (ret)
return ret;
}

2
arch/arm/mach-omap2/prm_common.c
View File

@ -798,7 +798,7 @@ int __init omap_prcm_init(void)
for_each_matching_node_and_match(np, omap_prcm_dt_match_table, &match) {
data = match->data;
ret = omap2_clk_provider_init(np, data->index, data->mem);
ret = omap2_clk_provider_init(np, data->index, NULL, data->mem);
if (ret)
return ret;
}