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path: root/drivers/clk/at91/clk-programmable.c
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Diffstat (limited to 'drivers/clk/at91/clk-programmable.c')
-rw-r--r--drivers/clk/at91/clk-programmable.c119
1 files changed, 69 insertions, 50 deletions
diff --git a/drivers/clk/at91/clk-programmable.c b/drivers/clk/at91/clk-programmable.c
index 857ede1ca9..3bf13568f5 100644
--- a/drivers/clk/at91/clk-programmable.c
+++ b/drivers/clk/at91/clk-programmable.c
@@ -1,56 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
*/
-#include <common.h>
-#include <clock.h>
-#include <io.h>
-#include <linux/list.h>
-#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
+#include <of.h>
#include <mfd/syscon.h>
-#include <regmap.h>
+#include <linux/regmap.h>
#include "pmc.h"
-#define PROG_SOURCE_MAX 5
#define PROG_ID_MAX 7
#define PROG_STATUS_MASK(id) (1 << ((id) + 8))
-#define PROG_PRES_MASK 0x7
-#define PROG_PRES(layout, pckr) ((pckr >> layout->pres_shift) & PROG_PRES_MASK)
+#define PROG_PRES(layout, pckr) ((pckr >> layout->pres_shift) & layout->pres_mask)
#define PROG_MAX_RM9200_CSS 3
struct clk_programmable {
- struct clk clk;
+ struct clk_hw hw;
struct regmap *regmap;
+ u32 *mux_table;
u8 id;
const struct clk_programmable_layout *layout;
- const char *parent_names[PROG_SOURCE_MAX];
+ struct at91_clk_pms pms;
};
-#define to_clk_programmable(clk) container_of(clk, struct clk_programmable, clk)
+#define to_clk_programmable(hw) container_of(hw, struct clk_programmable, hw)
-static unsigned long clk_programmable_recalc_rate(struct clk *clk,
+static unsigned long clk_programmable_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
- struct clk_programmable *prog = to_clk_programmable(clk);
+ struct clk_programmable *prog = to_clk_programmable(hw);
+ const struct clk_programmable_layout *layout = prog->layout;
unsigned int pckr;
+ unsigned long rate;
regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
- return parent_rate >> PROG_PRES(prog->layout, pckr);
+ if (layout->is_pres_direct)
+ rate = parent_rate / (PROG_PRES(layout, pckr) + 1);
+ else
+ rate = parent_rate >> PROG_PRES(layout, pckr);
+
+ return rate;
}
-static int clk_programmable_set_parent(struct clk *clk, u8 index)
+static int clk_programmable_set_parent(struct clk_hw *hw, u8 index)
{
- struct clk_programmable *prog = to_clk_programmable(clk);
+ struct clk_programmable *prog = to_clk_programmable(hw);
const struct clk_programmable_layout *layout = prog->layout;
unsigned int mask = layout->css_mask;
unsigned int pckr = index;
@@ -58,6 +57,9 @@ static int clk_programmable_set_parent(struct clk *clk, u8 index)
if (layout->have_slck_mck)
mask |= AT91_PMC_CSSMCK_MCK;
+ if (prog->mux_table)
+ pckr = clk_mux_index_to_val(prog->mux_table, 0, index);
+
if (index > layout->css_mask) {
if (index > PROG_MAX_RM9200_CSS && !layout->have_slck_mck)
return -EINVAL;
@@ -65,14 +67,14 @@ static int clk_programmable_set_parent(struct clk *clk, u8 index)
pckr |= AT91_PMC_CSSMCK_MCK;
}
- regmap_write_bits(prog->regmap, AT91_PMC_PCKR(prog->id), mask, pckr);
+ regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id), mask, pckr);
return 0;
}
-static int clk_programmable_get_parent(struct clk *clk)
+static int clk_programmable_get_parent(struct clk_hw *hw)
{
- struct clk_programmable *prog = to_clk_programmable(clk);
+ struct clk_programmable *prog = to_clk_programmable(hw);
const struct clk_programmable_layout *layout = prog->layout;
unsigned int pckr;
u8 ret;
@@ -84,33 +86,40 @@ static int clk_programmable_get_parent(struct clk *clk)
if (layout->have_slck_mck && (pckr & AT91_PMC_CSSMCK_MCK) && !ret)
ret = PROG_MAX_RM9200_CSS + 1;
+ if (prog->mux_table)
+ ret = clk_mux_val_to_index(&prog->hw, prog->mux_table, 0, ret);
+
return ret;
}
-static int clk_programmable_set_rate(struct clk *clk, unsigned long rate,
+static int clk_programmable_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
- struct clk_programmable *prog = to_clk_programmable(clk);
+ struct clk_programmable *prog = to_clk_programmable(hw);
const struct clk_programmable_layout *layout = prog->layout;
unsigned long div = parent_rate / rate;
- unsigned int pckr;
int shift = 0;
- regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
-
if (!div)
return -EINVAL;
- shift = fls(div) - 1;
+ if (layout->is_pres_direct) {
+ shift = div - 1;
- if (div != (1 << shift))
- return -EINVAL;
+ if (shift > layout->pres_mask)
+ return -EINVAL;
+ } else {
+ shift = fls(div) - 1;
- if (shift >= PROG_PRES_MASK)
- return -EINVAL;
+ if (div != (1 << shift))
+ return -EINVAL;
+
+ if (shift >= layout->pres_mask)
+ return -EINVAL;
+ }
- regmap_write_bits(prog->regmap, AT91_PMC_PCKR(prog->id),
- PROG_PRES_MASK << layout->pres_shift,
+ regmap_update_bits(prog->regmap, AT91_PMC_PCKR(prog->id),
+ layout->pres_mask << layout->pres_shift,
shift << layout->pres_shift);
return 0;
@@ -123,13 +132,16 @@ static const struct clk_ops programmable_ops = {
.set_rate = clk_programmable_set_rate,
};
-struct clk *
+struct clk_hw * __init
at91_clk_register_programmable(struct regmap *regmap,
const char *name, const char **parent_names,
u8 num_parents, u8 id,
- const struct clk_programmable_layout *layout)
+ const struct clk_programmable_layout *layout,
+ u32 *mux_table)
{
struct clk_programmable *prog;
+ struct clk_hw *hw;
+ struct clk_init_data init;
int ret;
if (id > PROG_ID_MAX)
@@ -139,41 +151,48 @@ at91_clk_register_programmable(struct regmap *regmap,
if (!prog)
return ERR_PTR(-ENOMEM);
- prog->clk.name = name;
- prog->clk.ops = &programmable_ops;
- memcpy(prog->parent_names, parent_names,
- num_parents * sizeof(prog->parent_names[0]));
- prog->clk.parent_names = &prog->parent_names[0];
- prog->clk.num_parents = num_parents;
- /* init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; */
+ init.name = name;
+ init.ops = &programmable_ops;
+ init.parent_names = parent_names;
+ init.num_parents = num_parents;
+ init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
prog->id = id;
prog->layout = layout;
+ prog->hw.init = &init;
prog->regmap = regmap;
+ prog->mux_table = mux_table;
- ret = clk_register(&prog->clk);
+ hw = &prog->hw;
+ ret = clk_hw_register(NULL, &prog->hw);
if (ret) {
kfree(prog);
- return ERR_PTR(ret);
+ hw = ERR_PTR(ret);
}
- return &prog->clk;
+ return hw;
}
const struct clk_programmable_layout at91rm9200_programmable_layout = {
+ .pres_mask = 0x7,
.pres_shift = 2,
.css_mask = 0x3,
.have_slck_mck = 0,
+ .is_pres_direct = 0,
};
const struct clk_programmable_layout at91sam9g45_programmable_layout = {
+ .pres_mask = 0x7,
.pres_shift = 2,
.css_mask = 0x3,
.have_slck_mck = 1,
+ .is_pres_direct = 0,
};
const struct clk_programmable_layout at91sam9x5_programmable_layout = {
+ .pres_mask = 0x7,
.pres_shift = 4,
.css_mask = 0x7,
.have_slck_mck = 0,
+ .is_pres_direct = 0,
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-25 00:04:27 +0000