![Arnd Bergmann](/assets/img/avatar_default.png)
When CONFIG_ATAGS or CONFIG_OMAP3 is disabled, we get a build error:
In file included from include/linux/clk-provider.h:15:0,
from drivers/clk/ti/clk.c:19:
drivers/clk/ti/clk.c: In function 'ti_clk_add_aliases':
drivers/clk/ti/clk.c:438:29: error: 'simple_clk_match_table' undeclared (first use in this function); did you mean 'simple_attr_write'?
Moving the match table down fixes it.
Fixes: c17435c56b
("clk: ti: add API for creating aliases automatically for simple clock types")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
557 lines
13 KiB
C
557 lines
13 KiB
C
/*
|
|
* 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/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/list.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/device.h>
|
|
|
|
#include "clock.h"
|
|
|
|
#undef pr_fmt
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
struct ti_clk_ll_ops *ti_clk_ll_ops;
|
|
static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
|
|
|
|
static 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 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;
|
|
|
|
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;
|
|
struct clk *clk;
|
|
struct of_phandle_args clkspec;
|
|
|
|
for (c = oclks; c->node_name != NULL; c++) {
|
|
node = of_find_node_by_name(NULL, c->node_name);
|
|
clkspec.np = node;
|
|
clk = of_clk_get_from_provider(&clkspec);
|
|
|
|
if (!IS_ERR(clk)) {
|
|
c->lk.clk = clk;
|
|
clkdev_add(&c->lk);
|
|
} else {
|
|
pr_warn("failed to lookup clock node %s\n",
|
|
c->node_name);
|
|
}
|
|
}
|
|
}
|
|
|
|
struct clk_init_item {
|
|
struct device_node *node;
|
|
struct clk_hw *hw;
|
|
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
|
|
* @hw: partially initialized clk_hw struct for the clock
|
|
* @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, struct clk_hw *hw,
|
|
ti_of_clk_init_cb_t func)
|
|
{
|
|
struct clk_init_item *retry;
|
|
|
|
pr_debug("%s: adding to retry list...\n", node->name);
|
|
retry = kzalloc(sizeof(*retry), GFP_KERNEL);
|
|
if (!retry)
|
|
return -ENOMEM;
|
|
|
|
retry->node = node;
|
|
retry->func = func;
|
|
retry->hw = hw;
|
|
list_add(&retry->link, &retry_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_clk_get_reg_addr - get register address for a clock register
|
|
* @node: device node for the clock
|
|
* @index: register index from the clock node
|
|
* @reg: pointer to target register struct
|
|
*
|
|
* Builds clock register address from device tree information, and returns
|
|
* the data via the provided output pointer @reg. Returns 0 on success,
|
|
* negative error value on failure.
|
|
*/
|
|
int ti_clk_get_reg_addr(struct device_node *node, int index,
|
|
struct clk_omap_reg *reg)
|
|
{
|
|
u32 val;
|
|
int i;
|
|
|
|
for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
|
|
if (clocks_node_ptr[i] == node->parent)
|
|
break;
|
|
}
|
|
|
|
if (i == CLK_MAX_MEMMAPS) {
|
|
pr_err("clk-provider not found for %s!\n", node->name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
reg->index = i;
|
|
|
|
if (of_property_read_u32_index(node, "reg", index, &val)) {
|
|
pr_err("%s must have reg[%d]!\n", node->name, index);
|
|
return -EINVAL;
|
|
}
|
|
|
|
reg->offset = val;
|
|
reg->ptr = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_clk_provider_init - init master clock provider
|
|
* @parent: master node
|
|
* @index: internal index for clk_reg_ops
|
|
* @syscon: syscon regmap pointer for accessing clock registers
|
|
* @mem: iomem pointer for the clock provider memory area, only used if
|
|
* syscon is not provided
|
|
*
|
|
* Initializes a master clock IP block. This basically sets up the
|
|
* mapping from clocks node to the memory map index. All the clocks
|
|
* are then initialized through the common of_clk_init call, and the
|
|
* clocks will access their memory maps based on the node layout.
|
|
* Returns 0 in success.
|
|
*/
|
|
int __init omap2_clk_provider_init(struct device_node *parent, int index,
|
|
struct regmap *syscon, void __iomem *mem)
|
|
{
|
|
struct device_node *clocks;
|
|
struct clk_iomap *io;
|
|
|
|
/* get clocks for this parent */
|
|
clocks = of_get_child_by_name(parent, "clocks");
|
|
if (!clocks) {
|
|
pr_err("%s missing 'clocks' child node.\n", parent->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* add clocks node info */
|
|
clocks_node_ptr[index] = clocks;
|
|
|
|
io = kzalloc(sizeof(*io), GFP_KERNEL);
|
|
if (!io)
|
|
return -ENOMEM;
|
|
|
|
io->regmap = syscon;
|
|
io->mem = mem;
|
|
|
|
clk_memmaps[index] = io;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* omap2_clk_legacy_provider_init - initialize a legacy clock provider
|
|
* @index: index for the clock provider
|
|
* @mem: iomem pointer for the clock provider memory area
|
|
*
|
|
* Initializes a legacy clock provider memory mapping.
|
|
*/
|
|
void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
|
|
{
|
|
struct clk_iomap *io;
|
|
|
|
io = memblock_virt_alloc(sizeof(*io), 0);
|
|
|
|
io->mem = mem;
|
|
|
|
clk_memmaps[index] = io;
|
|
}
|
|
|
|
/**
|
|
* ti_dt_clk_init_retry_clks - init clocks from the retry list
|
|
*
|
|
* Initializes any clocks that have failed to initialize before,
|
|
* reasons being missing parent node(s) during earlier init. This
|
|
* typically happens only for DPLLs which need to have both of their
|
|
* parent clocks ready during init.
|
|
*/
|
|
void ti_dt_clk_init_retry_clks(void)
|
|
{
|
|
struct clk_init_item *retry;
|
|
struct clk_init_item *tmp;
|
|
int retries = 5;
|
|
|
|
while (!list_empty(&retry_list) && retries) {
|
|
list_for_each_entry_safe(retry, tmp, &retry_list, link) {
|
|
pr_debug("retry-init: %s\n", retry->node->name);
|
|
retry->func(retry->hw, retry->node);
|
|
list_del(&retry->link);
|
|
kfree(retry);
|
|
}
|
|
retries--;
|
|
}
|
|
}
|
|
|
|
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
|
|
void __init ti_clk_patch_legacy_clks(struct ti_clk **patch)
|
|
{
|
|
while (*patch) {
|
|
memcpy((*patch)->patch, *patch, sizeof(**patch));
|
|
patch++;
|
|
}
|
|
}
|
|
|
|
struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
|
|
{
|
|
struct clk *clk;
|
|
struct ti_clk_fixed *fixed;
|
|
struct ti_clk_fixed_factor *fixed_factor;
|
|
struct clk_hw *clk_hw;
|
|
int ret;
|
|
|
|
if (setup->clk)
|
|
return setup->clk;
|
|
|
|
switch (setup->type) {
|
|
case TI_CLK_FIXED:
|
|
fixed = setup->data;
|
|
|
|
clk = clk_register_fixed_rate(NULL, setup->name, NULL, 0,
|
|
fixed->frequency);
|
|
if (!IS_ERR(clk)) {
|
|
ret = ti_clk_add_alias(NULL, clk, setup->name);
|
|
if (ret) {
|
|
clk_unregister(clk);
|
|
clk = ERR_PTR(ret);
|
|
}
|
|
}
|
|
break;
|
|
case TI_CLK_MUX:
|
|
clk = ti_clk_register_mux(setup);
|
|
break;
|
|
case TI_CLK_DIVIDER:
|
|
clk = ti_clk_register_divider(setup);
|
|
break;
|
|
case TI_CLK_COMPOSITE:
|
|
clk = ti_clk_register_composite(setup);
|
|
break;
|
|
case TI_CLK_FIXED_FACTOR:
|
|
fixed_factor = setup->data;
|
|
|
|
clk = clk_register_fixed_factor(NULL, setup->name,
|
|
fixed_factor->parent,
|
|
0, fixed_factor->mult,
|
|
fixed_factor->div);
|
|
if (!IS_ERR(clk)) {
|
|
ret = ti_clk_add_alias(NULL, clk, setup->name);
|
|
if (ret) {
|
|
clk_unregister(clk);
|
|
clk = ERR_PTR(ret);
|
|
}
|
|
}
|
|
break;
|
|
case TI_CLK_GATE:
|
|
clk = ti_clk_register_gate(setup);
|
|
break;
|
|
case TI_CLK_DPLL:
|
|
clk = ti_clk_register_dpll(setup);
|
|
break;
|
|
default:
|
|
pr_err("bad type for %s!\n", setup->name);
|
|
clk = ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
if (!IS_ERR(clk)) {
|
|
setup->clk = clk;
|
|
if (setup->clkdm_name) {
|
|
clk_hw = __clk_get_hw(clk);
|
|
if (clk_hw_get_flags(clk_hw) & CLK_IS_BASIC) {
|
|
pr_warn("can't setup clkdm for basic clk %s\n",
|
|
setup->name);
|
|
} else {
|
|
to_clk_hw_omap(clk_hw)->clkdm_name =
|
|
setup->clkdm_name;
|
|
omap2_init_clk_clkdm(clk_hw);
|
|
}
|
|
}
|
|
}
|
|
|
|
return clk;
|
|
}
|
|
|
|
int __init ti_clk_register_legacy_clks(struct ti_clk_alias *clks)
|
|
{
|
|
struct clk *clk;
|
|
bool retry;
|
|
struct ti_clk_alias *retry_clk;
|
|
struct ti_clk_alias *tmp;
|
|
|
|
while (clks->clk) {
|
|
clk = ti_clk_register_clk(clks->clk);
|
|
if (IS_ERR(clk)) {
|
|
if (PTR_ERR(clk) == -EAGAIN) {
|
|
list_add(&clks->link, &retry_list);
|
|
} else {
|
|
pr_err("register for %s failed: %ld\n",
|
|
clks->clk->name, PTR_ERR(clk));
|
|
return PTR_ERR(clk);
|
|
}
|
|
}
|
|
clks++;
|
|
}
|
|
|
|
retry = true;
|
|
|
|
while (!list_empty(&retry_list) && retry) {
|
|
retry = false;
|
|
list_for_each_entry_safe(retry_clk, tmp, &retry_list, link) {
|
|
pr_debug("retry-init: %s\n", retry_clk->clk->name);
|
|
clk = ti_clk_register_clk(retry_clk->clk);
|
|
if (IS_ERR(clk)) {
|
|
if (PTR_ERR(clk) == -EAGAIN) {
|
|
continue;
|
|
} else {
|
|
pr_err("register for %s failed: %ld\n",
|
|
retry_clk->clk->name,
|
|
PTR_ERR(clk));
|
|
return PTR_ERR(clk);
|
|
}
|
|
} else {
|
|
retry = true;
|
|
list_del(&retry_clk->link);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct of_device_id simple_clk_match_table[] __initconst = {
|
|
{ .compatible = "fixed-clock" },
|
|
{ .compatible = "fixed-factor-clock" },
|
|
{ }
|
|
};
|
|
|
|
/**
|
|
* ti_clk_add_aliases - setup clock aliases
|
|
*
|
|
* Sets up any missing clock aliases. No return value.
|
|
*/
|
|
void __init ti_clk_add_aliases(void)
|
|
{
|
|
struct device_node *np;
|
|
struct clk *clk;
|
|
|
|
for_each_matching_node(np, simple_clk_match_table) {
|
|
struct of_phandle_args clkspec;
|
|
|
|
clkspec.np = np;
|
|
clk = of_clk_get_from_provider(&clkspec);
|
|
|
|
ti_clk_add_alias(NULL, clk, np->name);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ti_clk_setup_features - setup clock features flags
|
|
* @features: features definition to use
|
|
*
|
|
* Initializes the clock driver features flags based on platform
|
|
* provided data. No return value.
|
|
*/
|
|
void __init ti_clk_setup_features(struct ti_clk_features *features)
|
|
{
|
|
memcpy(&ti_clk_features, features, sizeof(*features));
|
|
}
|
|
|
|
/**
|
|
* ti_clk_get_features - get clock driver features flags
|
|
*
|
|
* Get TI clock driver features description. Returns a pointer
|
|
* to the current feature setup.
|
|
*/
|
|
const struct ti_clk_features *ti_clk_get_features(void)
|
|
{
|
|
return &ti_clk_features;
|
|
}
|
|
|
|
/**
|
|
* omap2_clk_enable_init_clocks - prepare & enable a list of clocks
|
|
* @clk_names: ptr to an array of strings of clock names to enable
|
|
* @num_clocks: number of clock names in @clk_names
|
|
*
|
|
* Prepare and enable a list of clocks, named by @clk_names. No
|
|
* return value. XXX Deprecated; only needed until these clocks are
|
|
* properly claimed and enabled by the drivers or core code that uses
|
|
* them. XXX What code disables & calls clk_put on these clocks?
|
|
*/
|
|
void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
|
|
{
|
|
struct clk *init_clk;
|
|
int i;
|
|
|
|
for (i = 0; i < num_clocks; i++) {
|
|
init_clk = clk_get(NULL, clk_names[i]);
|
|
if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
|
|
clk_names[i]))
|
|
continue;
|
|
clk_prepare_enable(init_clk);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ti_clk_add_alias - add a clock alias for a TI clock
|
|
* @dev: device alias for this clock
|
|
* @clk: clock handle to create alias for
|
|
* @con: connection ID for this clock
|
|
*
|
|
* Creates a clock alias for a TI clock. Allocates the clock lookup entry
|
|
* and assigns the data to it. Returns 0 if successful, negative error
|
|
* value otherwise.
|
|
*/
|
|
int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con)
|
|
{
|
|
struct clk_lookup *cl;
|
|
|
|
if (!clk)
|
|
return 0;
|
|
|
|
if (IS_ERR(clk))
|
|
return PTR_ERR(clk);
|
|
|
|
cl = kzalloc(sizeof(*cl), GFP_KERNEL);
|
|
if (!cl)
|
|
return -ENOMEM;
|
|
|
|
if (dev)
|
|
cl->dev_id = dev_name(dev);
|
|
cl->con_id = con;
|
|
cl->clk = clk;
|
|
|
|
clkdev_add(cl);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ti_clk_register - register a TI clock to the common clock framework
|
|
* @dev: device for this clock
|
|
* @hw: hardware clock handle
|
|
* @con: connection ID for this clock
|
|
*
|
|
* Registers a TI clock to the common clock framework, and adds a clock
|
|
* alias for it. Returns a handle to the registered clock if successful,
|
|
* ERR_PTR value in failure.
|
|
*/
|
|
struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
|
|
const char *con)
|
|
{
|
|
struct clk *clk;
|
|
int ret;
|
|
|
|
clk = clk_register(dev, hw);
|
|
if (IS_ERR(clk))
|
|
return clk;
|
|
|
|
ret = ti_clk_add_alias(dev, clk, con);
|
|
if (ret) {
|
|
clk_unregister(clk);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return clk;
|
|
}
|