mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Claudiu Beznea](/assets/img/avatar_default.png)
kasprintf() returns a pointer to dynamically allocated memory. Pointer could be NULL in case allocation fails. Check pointer validity. Identified with coccinelle (kmerr.cocci script). Fixes:b745c0794e
("clk: keystone: Add sci-clk driver support") Depends-on:96488c09b0
("clk: keystone: sci-clk: cut down the clock name length") Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> Link: https://lore.kernel.org/r/20230530093913.1656095-7-claudiu.beznea@microchip.com Reviewed-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
712 lines
18 KiB
C
712 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* SCI Clock driver for keystone based devices
|
|
*
|
|
* Copyright (C) 2015-2016 Texas Instruments Incorporated - https://www.ti.com/
|
|
* Tero Kristo <t-kristo@ti.com>
|
|
*/
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/soc/ti/ti_sci_protocol.h>
|
|
#include <linux/bsearch.h>
|
|
#include <linux/list_sort.h>
|
|
|
|
#define SCI_CLK_SSC_ENABLE BIT(0)
|
|
#define SCI_CLK_ALLOW_FREQ_CHANGE BIT(1)
|
|
#define SCI_CLK_INPUT_TERMINATION BIT(2)
|
|
|
|
/**
|
|
* struct sci_clk_provider - TI SCI clock provider representation
|
|
* @sci: Handle to the System Control Interface protocol handler
|
|
* @ops: Pointer to the SCI ops to be used by the clocks
|
|
* @dev: Device pointer for the clock provider
|
|
* @clocks: Clocks array for this device
|
|
* @num_clocks: Total number of clocks for this provider
|
|
*/
|
|
struct sci_clk_provider {
|
|
const struct ti_sci_handle *sci;
|
|
const struct ti_sci_clk_ops *ops;
|
|
struct device *dev;
|
|
struct sci_clk **clocks;
|
|
int num_clocks;
|
|
};
|
|
|
|
/**
|
|
* struct sci_clk - TI SCI clock representation
|
|
* @hw: Hardware clock cookie for common clock framework
|
|
* @dev_id: Device index
|
|
* @clk_id: Clock index
|
|
* @num_parents: Number of parents for this clock
|
|
* @provider: Master clock provider
|
|
* @flags: Flags for the clock
|
|
* @node: Link for handling clocks probed via DT
|
|
* @cached_req: Cached requested freq for determine rate calls
|
|
* @cached_res: Cached result freq for determine rate calls
|
|
*/
|
|
struct sci_clk {
|
|
struct clk_hw hw;
|
|
u16 dev_id;
|
|
u32 clk_id;
|
|
u32 num_parents;
|
|
struct sci_clk_provider *provider;
|
|
u8 flags;
|
|
struct list_head node;
|
|
unsigned long cached_req;
|
|
unsigned long cached_res;
|
|
};
|
|
|
|
#define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw)
|
|
|
|
/**
|
|
* sci_clk_prepare - Prepare (enable) a TI SCI clock
|
|
* @hw: clock to prepare
|
|
*
|
|
* Prepares a clock to be actively used. Returns the SCI protocol status.
|
|
*/
|
|
static int sci_clk_prepare(struct clk_hw *hw)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
bool enable_ssc = clk->flags & SCI_CLK_SSC_ENABLE;
|
|
bool allow_freq_change = clk->flags & SCI_CLK_ALLOW_FREQ_CHANGE;
|
|
bool input_termination = clk->flags & SCI_CLK_INPUT_TERMINATION;
|
|
|
|
return clk->provider->ops->get_clock(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id, enable_ssc,
|
|
allow_freq_change,
|
|
input_termination);
|
|
}
|
|
|
|
/**
|
|
* sci_clk_unprepare - Un-prepares (disables) a TI SCI clock
|
|
* @hw: clock to unprepare
|
|
*
|
|
* Un-prepares a clock from active state.
|
|
*/
|
|
static void sci_clk_unprepare(struct clk_hw *hw)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
int ret;
|
|
|
|
ret = clk->provider->ops->put_clock(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id);
|
|
if (ret)
|
|
dev_err(clk->provider->dev,
|
|
"unprepare failed for dev=%d, clk=%d, ret=%d\n",
|
|
clk->dev_id, clk->clk_id, ret);
|
|
}
|
|
|
|
/**
|
|
* sci_clk_is_prepared - Check if a TI SCI clock is prepared or not
|
|
* @hw: clock to check status for
|
|
*
|
|
* Checks if a clock is prepared (enabled) in hardware. Returns non-zero
|
|
* value if clock is enabled, zero otherwise.
|
|
*/
|
|
static int sci_clk_is_prepared(struct clk_hw *hw)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
bool req_state, current_state;
|
|
int ret;
|
|
|
|
ret = clk->provider->ops->is_on(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id, &req_state,
|
|
¤t_state);
|
|
if (ret) {
|
|
dev_err(clk->provider->dev,
|
|
"is_prepared failed for dev=%d, clk=%d, ret=%d\n",
|
|
clk->dev_id, clk->clk_id, ret);
|
|
return 0;
|
|
}
|
|
|
|
return req_state;
|
|
}
|
|
|
|
/**
|
|
* sci_clk_recalc_rate - Get clock rate for a TI SCI clock
|
|
* @hw: clock to get rate for
|
|
* @parent_rate: parent rate provided by common clock framework, not used
|
|
*
|
|
* Gets the current clock rate of a TI SCI clock. Returns the current
|
|
* clock rate, or zero in failure.
|
|
*/
|
|
static unsigned long sci_clk_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
u64 freq;
|
|
int ret;
|
|
|
|
ret = clk->provider->ops->get_freq(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id, &freq);
|
|
if (ret) {
|
|
dev_err(clk->provider->dev,
|
|
"recalc-rate failed for dev=%d, clk=%d, ret=%d\n",
|
|
clk->dev_id, clk->clk_id, ret);
|
|
return 0;
|
|
}
|
|
|
|
return freq;
|
|
}
|
|
|
|
/**
|
|
* sci_clk_determine_rate - Determines a clock rate a clock can be set to
|
|
* @hw: clock to change rate for
|
|
* @req: requested rate configuration for the clock
|
|
*
|
|
* Determines a suitable clock rate and parent for a TI SCI clock.
|
|
* The parent handling is un-used, as generally the parent clock rates
|
|
* are not known by the kernel; instead these are internally handled
|
|
* by the firmware. Returns 0 on success, negative error value on failure.
|
|
*/
|
|
static int sci_clk_determine_rate(struct clk_hw *hw,
|
|
struct clk_rate_request *req)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
int ret;
|
|
u64 new_rate;
|
|
|
|
if (clk->cached_req && clk->cached_req == req->rate) {
|
|
req->rate = clk->cached_res;
|
|
return 0;
|
|
}
|
|
|
|
ret = clk->provider->ops->get_best_match_freq(clk->provider->sci,
|
|
clk->dev_id,
|
|
clk->clk_id,
|
|
req->min_rate,
|
|
req->rate,
|
|
req->max_rate,
|
|
&new_rate);
|
|
if (ret) {
|
|
dev_err(clk->provider->dev,
|
|
"determine-rate failed for dev=%d, clk=%d, ret=%d\n",
|
|
clk->dev_id, clk->clk_id, ret);
|
|
return ret;
|
|
}
|
|
|
|
clk->cached_req = req->rate;
|
|
clk->cached_res = new_rate;
|
|
|
|
req->rate = new_rate;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sci_clk_set_rate - Set rate for a TI SCI clock
|
|
* @hw: clock to change rate for
|
|
* @rate: target rate for the clock
|
|
* @parent_rate: rate of the clock parent, not used for TI SCI clocks
|
|
*
|
|
* Sets a clock frequency for a TI SCI clock. Returns the TI SCI
|
|
* protocol status.
|
|
*/
|
|
static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
|
|
return clk->provider->ops->set_freq(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id, rate / 10 * 9, rate,
|
|
rate / 10 * 11);
|
|
}
|
|
|
|
/**
|
|
* sci_clk_get_parent - Get the current parent of a TI SCI clock
|
|
* @hw: clock to get parent for
|
|
*
|
|
* Returns the index of the currently selected parent for a TI SCI clock.
|
|
*/
|
|
static u8 sci_clk_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
u32 parent_id = 0;
|
|
int ret;
|
|
|
|
ret = clk->provider->ops->get_parent(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id, (void *)&parent_id);
|
|
if (ret) {
|
|
dev_err(clk->provider->dev,
|
|
"get-parent failed for dev=%d, clk=%d, ret=%d\n",
|
|
clk->dev_id, clk->clk_id, ret);
|
|
return 0;
|
|
}
|
|
|
|
parent_id = parent_id - clk->clk_id - 1;
|
|
|
|
return (u8)parent_id;
|
|
}
|
|
|
|
/**
|
|
* sci_clk_set_parent - Set the parent of a TI SCI clock
|
|
* @hw: clock to set parent for
|
|
* @index: new parent index for the clock
|
|
*
|
|
* Sets the parent of a TI SCI clock. Return TI SCI protocol status.
|
|
*/
|
|
static int sci_clk_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct sci_clk *clk = to_sci_clk(hw);
|
|
|
|
clk->cached_req = 0;
|
|
|
|
return clk->provider->ops->set_parent(clk->provider->sci, clk->dev_id,
|
|
clk->clk_id,
|
|
index + 1 + clk->clk_id);
|
|
}
|
|
|
|
static const struct clk_ops sci_clk_ops = {
|
|
.prepare = sci_clk_prepare,
|
|
.unprepare = sci_clk_unprepare,
|
|
.is_prepared = sci_clk_is_prepared,
|
|
.recalc_rate = sci_clk_recalc_rate,
|
|
.determine_rate = sci_clk_determine_rate,
|
|
.set_rate = sci_clk_set_rate,
|
|
.get_parent = sci_clk_get_parent,
|
|
.set_parent = sci_clk_set_parent,
|
|
};
|
|
|
|
/**
|
|
* _sci_clk_get - Gets a handle for an SCI clock
|
|
* @provider: Handle to SCI clock provider
|
|
* @sci_clk: Handle to the SCI clock to populate
|
|
*
|
|
* Gets a handle to an existing TI SCI hw clock, or builds a new clock
|
|
* entry and registers it with the common clock framework. Called from
|
|
* the common clock framework, when a corresponding of_clk_get call is
|
|
* executed, or recursively from itself when parsing parent clocks.
|
|
* Returns 0 on success, negative error code on failure.
|
|
*/
|
|
static int _sci_clk_build(struct sci_clk_provider *provider,
|
|
struct sci_clk *sci_clk)
|
|
{
|
|
struct clk_init_data init = { NULL };
|
|
char *name = NULL;
|
|
char **parent_names = NULL;
|
|
int i;
|
|
int ret = 0;
|
|
|
|
name = kasprintf(GFP_KERNEL, "clk:%d:%d", sci_clk->dev_id,
|
|
sci_clk->clk_id);
|
|
if (!name)
|
|
return -ENOMEM;
|
|
|
|
init.name = name;
|
|
|
|
/*
|
|
* From kernel point of view, we only care about a clocks parents,
|
|
* if it has more than 1 possible parent. In this case, it is going
|
|
* to have mux functionality. Otherwise it is going to act as a root
|
|
* clock.
|
|
*/
|
|
if (sci_clk->num_parents < 2)
|
|
sci_clk->num_parents = 0;
|
|
|
|
if (sci_clk->num_parents) {
|
|
parent_names = kcalloc(sci_clk->num_parents, sizeof(char *),
|
|
GFP_KERNEL);
|
|
|
|
if (!parent_names) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i < sci_clk->num_parents; i++) {
|
|
char *parent_name;
|
|
|
|
parent_name = kasprintf(GFP_KERNEL, "clk:%d:%d",
|
|
sci_clk->dev_id,
|
|
sci_clk->clk_id + 1 + i);
|
|
if (!parent_name) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
parent_names[i] = parent_name;
|
|
}
|
|
init.parent_names = (void *)parent_names;
|
|
}
|
|
|
|
init.ops = &sci_clk_ops;
|
|
init.num_parents = sci_clk->num_parents;
|
|
sci_clk->hw.init = &init;
|
|
|
|
ret = devm_clk_hw_register(provider->dev, &sci_clk->hw);
|
|
if (ret)
|
|
dev_err(provider->dev, "failed clk register with %d\n", ret);
|
|
|
|
err:
|
|
if (parent_names) {
|
|
for (i = 0; i < sci_clk->num_parents; i++)
|
|
kfree(parent_names[i]);
|
|
|
|
kfree(parent_names);
|
|
}
|
|
|
|
kfree(name);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int _cmp_sci_clk(const void *a, const void *b)
|
|
{
|
|
const struct sci_clk *ca = a;
|
|
const struct sci_clk *cb = *(struct sci_clk **)b;
|
|
|
|
if (ca->dev_id == cb->dev_id && ca->clk_id == cb->clk_id)
|
|
return 0;
|
|
if (ca->dev_id > cb->dev_id ||
|
|
(ca->dev_id == cb->dev_id && ca->clk_id > cb->clk_id))
|
|
return 1;
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* sci_clk_get - Xlate function for getting clock handles
|
|
* @clkspec: device tree clock specifier
|
|
* @data: pointer to the clock provider
|
|
*
|
|
* Xlate function for retrieving clock TI SCI hw clock handles based on
|
|
* device tree clock specifier. Called from the common clock framework,
|
|
* when a corresponding of_clk_get call is executed. Returns a pointer
|
|
* to the TI SCI hw clock struct, or ERR_PTR value in failure.
|
|
*/
|
|
static struct clk_hw *sci_clk_get(struct of_phandle_args *clkspec, void *data)
|
|
{
|
|
struct sci_clk_provider *provider = data;
|
|
struct sci_clk **clk;
|
|
struct sci_clk key;
|
|
|
|
if (clkspec->args_count != 2)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
key.dev_id = clkspec->args[0];
|
|
key.clk_id = clkspec->args[1];
|
|
|
|
clk = bsearch(&key, provider->clocks, provider->num_clocks,
|
|
sizeof(clk), _cmp_sci_clk);
|
|
|
|
if (!clk)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
return &(*clk)->hw;
|
|
}
|
|
|
|
static int ti_sci_init_clocks(struct sci_clk_provider *p)
|
|
{
|
|
int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < p->num_clocks; i++) {
|
|
ret = _sci_clk_build(p, p->clocks[i]);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ti_sci_clk_of_match[] = {
|
|
{ .compatible = "ti,k2g-sci-clk" },
|
|
{ /* Sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match);
|
|
|
|
#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW
|
|
static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider)
|
|
{
|
|
int ret;
|
|
int num_clks = 0;
|
|
struct sci_clk **clks = NULL;
|
|
struct sci_clk **tmp_clks;
|
|
struct sci_clk *sci_clk;
|
|
int max_clks = 0;
|
|
int clk_id = 0;
|
|
int dev_id = 0;
|
|
u32 num_parents = 0;
|
|
int gap_size = 0;
|
|
struct device *dev = provider->dev;
|
|
|
|
while (1) {
|
|
ret = provider->ops->get_num_parents(provider->sci, dev_id,
|
|
clk_id,
|
|
(void *)&num_parents);
|
|
if (ret) {
|
|
gap_size++;
|
|
if (!clk_id) {
|
|
if (gap_size >= 5)
|
|
break;
|
|
dev_id++;
|
|
} else {
|
|
if (gap_size >= 2) {
|
|
dev_id++;
|
|
clk_id = 0;
|
|
gap_size = 0;
|
|
} else {
|
|
clk_id++;
|
|
}
|
|
}
|
|
continue;
|
|
}
|
|
|
|
gap_size = 0;
|
|
|
|
if (num_clks == max_clks) {
|
|
tmp_clks = devm_kmalloc_array(dev, max_clks + 64,
|
|
sizeof(sci_clk),
|
|
GFP_KERNEL);
|
|
memcpy(tmp_clks, clks, max_clks * sizeof(sci_clk));
|
|
if (max_clks)
|
|
devm_kfree(dev, clks);
|
|
max_clks += 64;
|
|
clks = tmp_clks;
|
|
}
|
|
|
|
sci_clk = devm_kzalloc(dev, sizeof(*sci_clk), GFP_KERNEL);
|
|
if (!sci_clk)
|
|
return -ENOMEM;
|
|
sci_clk->dev_id = dev_id;
|
|
sci_clk->clk_id = clk_id;
|
|
sci_clk->provider = provider;
|
|
sci_clk->num_parents = num_parents;
|
|
|
|
clks[num_clks] = sci_clk;
|
|
|
|
clk_id++;
|
|
num_clks++;
|
|
}
|
|
|
|
provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk),
|
|
GFP_KERNEL);
|
|
if (!provider->clocks)
|
|
return -ENOMEM;
|
|
|
|
memcpy(provider->clocks, clks, num_clks * sizeof(sci_clk));
|
|
|
|
provider->num_clocks = num_clks;
|
|
|
|
devm_kfree(dev, clks);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#else
|
|
|
|
static int _cmp_sci_clk_list(void *priv, const struct list_head *a,
|
|
const struct list_head *b)
|
|
{
|
|
struct sci_clk *ca = container_of(a, struct sci_clk, node);
|
|
struct sci_clk *cb = container_of(b, struct sci_clk, node);
|
|
|
|
return _cmp_sci_clk(ca, &cb);
|
|
}
|
|
|
|
static int ti_sci_scan_clocks_from_dt(struct sci_clk_provider *provider)
|
|
{
|
|
struct device *dev = provider->dev;
|
|
struct device_node *np = NULL;
|
|
int ret;
|
|
int index;
|
|
struct of_phandle_args args;
|
|
struct list_head clks;
|
|
struct sci_clk *sci_clk, *prev;
|
|
int num_clks = 0;
|
|
int num_parents;
|
|
int clk_id;
|
|
const char * const clk_names[] = {
|
|
"clocks", "assigned-clocks", "assigned-clock-parents", NULL
|
|
};
|
|
const char * const *clk_name;
|
|
|
|
INIT_LIST_HEAD(&clks);
|
|
|
|
clk_name = clk_names;
|
|
|
|
while (*clk_name) {
|
|
np = of_find_node_with_property(np, *clk_name);
|
|
if (!np) {
|
|
clk_name++;
|
|
continue;
|
|
}
|
|
|
|
if (!of_device_is_available(np))
|
|
continue;
|
|
|
|
index = 0;
|
|
|
|
do {
|
|
ret = of_parse_phandle_with_args(np, *clk_name,
|
|
"#clock-cells", index,
|
|
&args);
|
|
if (ret)
|
|
break;
|
|
|
|
if (args.args_count == 2 && args.np == dev->of_node) {
|
|
sci_clk = devm_kzalloc(dev, sizeof(*sci_clk),
|
|
GFP_KERNEL);
|
|
if (!sci_clk)
|
|
return -ENOMEM;
|
|
|
|
sci_clk->dev_id = args.args[0];
|
|
sci_clk->clk_id = args.args[1];
|
|
sci_clk->provider = provider;
|
|
provider->ops->get_num_parents(provider->sci,
|
|
sci_clk->dev_id,
|
|
sci_clk->clk_id,
|
|
(void *)&sci_clk->num_parents);
|
|
list_add_tail(&sci_clk->node, &clks);
|
|
|
|
num_clks++;
|
|
|
|
num_parents = sci_clk->num_parents;
|
|
if (num_parents == 1)
|
|
num_parents = 0;
|
|
|
|
/*
|
|
* Linux kernel has inherent limitation
|
|
* of 255 clock parents at the moment.
|
|
* Right now, it is not expected that
|
|
* any mux clock from sci-clk driver
|
|
* would exceed that limit either, but
|
|
* the ABI basically provides that
|
|
* possibility. Print out a warning if
|
|
* this happens for any clock.
|
|
*/
|
|
if (num_parents >= 255) {
|
|
dev_warn(dev, "too many parents for dev=%d, clk=%d (%d), cropping to 255.\n",
|
|
sci_clk->dev_id,
|
|
sci_clk->clk_id, num_parents);
|
|
num_parents = 255;
|
|
}
|
|
|
|
clk_id = args.args[1] + 1;
|
|
|
|
while (num_parents--) {
|
|
sci_clk = devm_kzalloc(dev,
|
|
sizeof(*sci_clk),
|
|
GFP_KERNEL);
|
|
if (!sci_clk)
|
|
return -ENOMEM;
|
|
sci_clk->dev_id = args.args[0];
|
|
sci_clk->clk_id = clk_id++;
|
|
sci_clk->provider = provider;
|
|
list_add_tail(&sci_clk->node, &clks);
|
|
|
|
num_clks++;
|
|
}
|
|
}
|
|
|
|
index++;
|
|
} while (args.np);
|
|
}
|
|
|
|
list_sort(NULL, &clks, _cmp_sci_clk_list);
|
|
|
|
provider->clocks = devm_kmalloc_array(dev, num_clks, sizeof(sci_clk),
|
|
GFP_KERNEL);
|
|
if (!provider->clocks)
|
|
return -ENOMEM;
|
|
|
|
num_clks = 0;
|
|
prev = NULL;
|
|
|
|
list_for_each_entry(sci_clk, &clks, node) {
|
|
if (prev && prev->dev_id == sci_clk->dev_id &&
|
|
prev->clk_id == sci_clk->clk_id)
|
|
continue;
|
|
|
|
provider->clocks[num_clks++] = sci_clk;
|
|
prev = sci_clk;
|
|
}
|
|
|
|
provider->num_clocks = num_clks;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* ti_sci_clk_probe - Probe function for the TI SCI clock driver
|
|
* @pdev: platform device pointer to be probed
|
|
*
|
|
* Probes the TI SCI clock device. Allocates a new clock provider
|
|
* and registers this to the common clock framework. Also applies
|
|
* any required flags to the identified clocks via clock lists
|
|
* supplied from DT. Returns 0 for success, negative error value
|
|
* for failure.
|
|
*/
|
|
static int ti_sci_clk_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = dev->of_node;
|
|
struct sci_clk_provider *provider;
|
|
const struct ti_sci_handle *handle;
|
|
int ret;
|
|
|
|
handle = devm_ti_sci_get_handle(dev);
|
|
if (IS_ERR(handle))
|
|
return PTR_ERR(handle);
|
|
|
|
provider = devm_kzalloc(dev, sizeof(*provider), GFP_KERNEL);
|
|
if (!provider)
|
|
return -ENOMEM;
|
|
|
|
provider->sci = handle;
|
|
provider->ops = &handle->ops.clk_ops;
|
|
provider->dev = dev;
|
|
|
|
#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW
|
|
ret = ti_sci_scan_clocks_from_fw(provider);
|
|
if (ret) {
|
|
dev_err(dev, "scan clocks from FW failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
#else
|
|
ret = ti_sci_scan_clocks_from_dt(provider);
|
|
if (ret) {
|
|
dev_err(dev, "scan clocks from DT failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
ret = ti_sci_init_clocks(provider);
|
|
if (ret) {
|
|
pr_err("ti-sci-init-clocks failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
return of_clk_add_hw_provider(np, sci_clk_get, provider);
|
|
}
|
|
|
|
/**
|
|
* ti_sci_clk_remove - Remove TI SCI clock device
|
|
* @pdev: platform device pointer for the device to be removed
|
|
*
|
|
* Removes the TI SCI device. Unregisters the clock provider registered
|
|
* via common clock framework. Any memory allocated for the device will
|
|
* be free'd silently via the devm framework. Returns 0 always.
|
|
*/
|
|
static void ti_sci_clk_remove(struct platform_device *pdev)
|
|
{
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
}
|
|
|
|
static struct platform_driver ti_sci_clk_driver = {
|
|
.probe = ti_sci_clk_probe,
|
|
.remove_new = ti_sci_clk_remove,
|
|
.driver = {
|
|
.name = "ti-sci-clk",
|
|
.of_match_table = of_match_ptr(ti_sci_clk_of_match),
|
|
},
|
|
};
|
|
module_platform_driver(ti_sci_clk_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("TI System Control Interface(SCI) Clock driver");
|
|
MODULE_AUTHOR("Tero Kristo");
|
|
MODULE_ALIAS("platform:ti-sci-clk");
|