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-rw-r--r--drivers/clk/keystone/Kconfig11
-rw-r--r--drivers/clk/keystone/gate.c6
-rw-r--r--drivers/clk/keystone/pll.c6
-rw-r--r--drivers/clk/keystone/sci-clk.c239
4 files changed, 214 insertions, 48 deletions
diff --git a/drivers/clk/keystone/Kconfig b/drivers/clk/keystone/Kconfig
index 0ca63014718a..38aeefb1e808 100644
--- a/drivers/clk/keystone/Kconfig
+++ b/drivers/clk/keystone/Kconfig
@@ -15,3 +15,14 @@ config TI_SCI_CLK
This adds the clock driver support over TI System Control Interface.
If you wish to use clock resources from the PMMC firmware, say Y.
Otherwise, say N.
+
+config TI_SCI_CLK_PROBE_FROM_FW
+ bool "Probe available clocks from firmware"
+ depends on TI_SCI_CLK
+ default n
+ help
+ Forces the TI SCI clock driver to probe available clocks from the
+ firmware. By default, only the used clocks are probed from DT.
+ This is mostly only useful for debugging purposes, and will
+ increase the boot time of the device. If you want the clocks probed
+ from firmware, say Y. Otherwise, say N.
diff --git a/drivers/clk/keystone/gate.c b/drivers/clk/keystone/gate.c
index 4ed9b29ba438..13ea047489eb 100644
--- a/drivers/clk/keystone/gate.c
+++ b/drivers/clk/keystone/gate.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Clock driver for Keystone 2 based devices
*
* Copyright (C) 2013 Texas Instruments.
* Murali Karicheri <m-karicheri2@ti.com>
* Santosh Shilimkar <santosh.shilimkar@ti.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 <linux/clk-provider.h>
#include <linux/err.h>
diff --git a/drivers/clk/keystone/pll.c b/drivers/clk/keystone/pll.c
index 349540469fc0..d59a7621bb20 100644
--- a/drivers/clk/keystone/pll.c
+++ b/drivers/clk/keystone/pll.c
@@ -1,14 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PLL clock driver for Keystone devices
*
* Copyright (C) 2013 Texas Instruments Inc.
* Murali Karicheri <m-karicheri2@ti.com>
* Santosh Shilimkar <santosh.shilimkar@ti.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 <linux/clk-provider.h>
#include <linux/err.h>
diff --git a/drivers/clk/keystone/sci-clk.c b/drivers/clk/keystone/sci-clk.c
index 4cb70bed89a9..7edf8c8432b6 100644
--- a/drivers/clk/keystone/sci-clk.c
+++ b/drivers/clk/keystone/sci-clk.c
@@ -23,6 +23,7 @@
#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)
@@ -52,14 +53,16 @@ struct sci_clk_provider {
* @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
*/
struct sci_clk {
struct clk_hw hw;
u16 dev_id;
- u8 clk_id;
- u8 num_parents;
+ u32 clk_id;
+ u32 num_parents;
struct sci_clk_provider *provider;
u8 flags;
+ struct list_head node;
};
#define to_sci_clk(_hw) container_of(_hw, struct sci_clk, hw)
@@ -218,11 +221,11 @@ static int sci_clk_set_rate(struct clk_hw *hw, unsigned long rate,
static u8 sci_clk_get_parent(struct clk_hw *hw)
{
struct sci_clk *clk = to_sci_clk(hw);
- u8 parent_id;
+ u32 parent_id = 0;
int ret;
ret = clk->provider->ops->get_parent(clk->provider->sci, clk->dev_id,
- clk->clk_id, &parent_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",
@@ -230,7 +233,9 @@ static u8 sci_clk_get_parent(struct clk_hw *hw)
return 0;
}
- return parent_id - clk->clk_id - 1;
+ parent_id = parent_id - clk->clk_id - 1;
+
+ return (u8)parent_id;
}
/**
@@ -280,8 +285,8 @@ static int _sci_clk_build(struct sci_clk_provider *provider,
int i;
int ret = 0;
- name = kasprintf(GFP_KERNEL, "%s:%d:%d", dev_name(provider->dev),
- sci_clk->dev_id, sci_clk->clk_id);
+ name = kasprintf(GFP_KERNEL, "clk:%d:%d", sci_clk->dev_id,
+ sci_clk->clk_id);
init.name = name;
@@ -306,8 +311,7 @@ static int _sci_clk_build(struct sci_clk_provider *provider,
for (i = 0; i < sci_clk->num_parents; i++) {
char *parent_name;
- parent_name = kasprintf(GFP_KERNEL, "%s:%d:%d",
- dev_name(provider->dev),
+ parent_name = kasprintf(GFP_KERNEL, "clk:%d:%d",
sci_clk->dev_id,
sci_clk->clk_id + 1 + i);
if (!parent_name) {
@@ -404,22 +408,9 @@ static const struct of_device_id ti_sci_clk_of_match[] = {
};
MODULE_DEVICE_TABLE(of, ti_sci_clk_of_match);
-/**
- * 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)
+#ifdef CONFIG_TI_SCI_CLK_PROBE_FROM_FW
+static int ti_sci_scan_clocks_from_fw(struct sci_clk_provider *provider)
{
- 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;
int num_clks = 0;
struct sci_clk **clks = NULL;
@@ -428,24 +419,14 @@ static int ti_sci_clk_probe(struct platform_device *pdev)
int max_clks = 0;
int clk_id = 0;
int dev_id = 0;
- u8 num_parents;
+ u32 num_parents = 0;
int gap_size = 0;
-
- 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;
+ struct device *dev = provider->dev;
while (1) {
ret = provider->ops->get_num_parents(provider->sci, dev_id,
- clk_id, &num_parents);
+ clk_id,
+ (void *)&num_parents);
if (ret) {
gap_size++;
if (!clk_id) {
@@ -502,6 +483,188 @@ static int ti_sci_clk_probe(struct platform_device *pdev)
devm_kfree(dev, clks);
+ return 0;
+}
+
+#else
+
+static int _cmp_sci_clk_list(void *priv, struct list_head *a,
+ 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++;
+ break;
+ }
+
+ 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");
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