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/*
* TI clock 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.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/ti.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/list.h>
#include <linux/regmap.h>
#include <linux/memblock.h>
#include <linux/device.h>
#include "clock.h"
#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__
static LIST_HEAD(clk_hw_omap_clocks);
struct ti_clk_ll_ops *ti_clk_ll_ops;
static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
struct ti_clk_features ti_clk_features;
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, const struct clk_omap_reg *reg)
{
struct clk_iomap *io = clk_memmaps[reg->index];
if (reg->ptr)
writel_relaxed(val, reg->ptr);
else if (io->regmap)
regmap_write(io->regmap, reg->offset, val);
else
writel_relaxed(val, io->mem + reg->offset);
}
static void _clk_rmw(u32 val, u32 mask, void __iomem *ptr)
{
u32 v;
v = readl_relaxed(ptr);
v &= ~mask;
v |= val;
writel_relaxed(v, ptr);
}
static void clk_memmap_rmw(u32 val, u32 mask, const struct clk_omap_reg *reg)
{
struct clk_iomap *io = clk_memmaps[reg->index];
if (reg->ptr) {
_clk_rmw(val, mask, reg->ptr);
} else if (io->regmap) {
regmap_update_bits(io->regmap, reg->offset, mask, val);
} else {
_clk_rmw(val, mask, io->mem + reg->offset);
}
}
static u32 clk_memmap_readl(const struct clk_omap_reg *reg)
{
u32 val;
struct clk_iomap *io = clk_memmaps[reg->index];
if (reg->ptr)
val = readl_relaxed(reg->ptr);
else if (io->regmap)
regmap_read(io->regmap, reg->offset, &val);
else
val = readl_relaxed(io->mem + reg->offset);
return val;
}
/**
* ti_clk_setup_ll_ops - setup low level clock operations
* @ops: low level clock ops descriptor
*
* Sets up low level clock operations for TI clock driver. This is used
* to provide various callbacks for the clock driver towards platform
* specific code. Returns 0 on success, -EBUSY if ll_ops have been
* registered already.
*/
int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
{
if (ti_clk_ll_ops) {
pr_err("Attempt to register ll_ops multiple times.\n");
return -EBUSY;
}
ti_clk_ll_ops = ops;
ops->clk_readl = clk_memmap_readl;
ops->clk_writel = clk_memmap_writel;
ops->clk_rmw = clk_memmap_rmw;
return 0;
}
/**
* ti_dt_clocks_register - register DT alias clocks during boot
* @oclks: list of clocks to register
*
* Register alias or non-standard DT clock entries during boot. By
* default, DT clocks are found based on their node name. If any
* additional con-id / dev-id -> clock mapping is required, use this
* function to list these.
*/
void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
{
struct ti_dt_clk *c;
struct device_node *node, *parent;
struct clk *clk;
struct of_phandle_args clkspec;
char buf[64];
char *ptr;
char *tags[2];
int i;
int num_args;
int ret;
static bool clkctrl_nodes_missing;
static bool has_clkctrl_data;
static bool compat_mode;
compat_mode = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT;
for (c = oclks; c->node_name != NULL; c++) {
strcpy(buf, c->node_name);
ptr = buf;
for (i = 0; i < 2; i++)
tags[i] = NULL;
num_args = 0;
while (*ptr) {
if (*ptr == ':') {
if (num_args >= 2) {
pr_warn("Bad number of tags on %s\n",
c->node_name);
return;
}
tags[num_args++] = ptr + 1;
*ptr = 0;
}
ptr++;
}
if (num_args && clkctrl_nodes_missing)
continue;
node = of_find_node_by_name(NULL, buf);
if (num_args && compat_mode) {
parent = node;
node = of_get_child_by_name(parent, "clk");
of_node_put(parent);
}
clkspec.np = node;
clkspec.args_count = num_args;
for (i = 0; i < num_args; i++) {
ret = kstrtoint(tags[i], i ? 10 : 16, clkspec.args + i);
if (ret) {
pr_warn("Bad tag in %s at %d: %s\n",
c->node_name, i, tags[i]);
of_node_put(node);
return;
}
}
clk = of_clk_get_from_provider(&clkspec);
of_node_put(node);
if (!IS_ERR(clk)) {
c->lk.clk = clk;
clkdev_add(&c->lk);
} else {
if (num_args && !has_clkctrl_data) {
struct device_node *np;
np = of_find_compatible_node(NULL, NULL,
"ti,clkctrl");
if (np) {
has_clkctrl_data = true;
of_node_put(np);
} else {
clkctrl_nodes_missing = true;
pr_warn("missing clkctrl nodes, please update your dts.\n");
continue;
}
}
pr_warn("failed to lookup clock node %s, ret=%ld\n",
c->node_name, PTR_ERR(clk));
}
}
}
struct clk_init_item {
struct device_node *node;
void *user;
ti_of_clk_init_cb_t func;
struct list_head link;
};
static LIST_HEAD(retry_list);
/**
* ti_clk_retry_init - retries a failed clock init at later phase
* @node: device not for the clock
* @user: user data pointer
* @func: init function to be called for the clock
*
* Adds a failed clock init to the retry list. The retry list is parsed
* once all the other clocks have been initialized.
*/
int __init ti_clk_retry_init(struct device_node *node, void *user,
ti_of_clk_init_cb_t func)
{
struct clk_init_item *retry;
pr_debug("%pOFn: adding to retry list...\n", node);
retry = kzalloc(sizeof(*retry),
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