linux/drivers/clk/qcom/common.c
Johan Hovold 43a51019cc clk: qcom: common: fix legacy board-clock registration
Make sure to search only the child nodes of "/clocks", rather than the
whole device-tree depth-first starting at "/clocks" when determining
whether to register a fixed clock in the legacy board-clock registration
helper.

Fixes: ee15faffef ("clk: qcom: common: Add API to register board clocks backwards compatibly")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-11-14 15:53:29 -08:00

292 lines
6.9 KiB
C

/*
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/export.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>
#include <linux/clk-provider.h>
#include <linux/reset-controller.h>
#include <linux/of.h>
#include "common.h"
#include "clk-rcg.h"
#include "clk-regmap.h"
#include "reset.h"
#include "gdsc.h"
struct qcom_cc {
struct qcom_reset_controller reset;
struct clk_regmap **rclks;
size_t num_rclks;
};
const
struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
{
if (!f)
return NULL;
for (; f->freq; f++)
if (rate <= f->freq)
return f;
/* Default to our fastest rate */
return f - 1;
}
EXPORT_SYMBOL_GPL(qcom_find_freq);
const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
unsigned long rate)
{
const struct freq_tbl *best = NULL;
for ( ; f->freq; f++) {
if (rate >= f->freq)
best = f;
else
break;
}
return best;
}
EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
{
int i, num_parents = clk_hw_get_num_parents(hw);
for (i = 0; i < num_parents; i++)
if (src == map[i].src)
return i;
return -ENOENT;
}
EXPORT_SYMBOL_GPL(qcom_find_src_index);
struct regmap *
qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
{
void __iomem *base;
struct resource *res;
struct device *dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return ERR_CAST(base);
return devm_regmap_init_mmio(dev, base, desc->config);
}
EXPORT_SYMBOL_GPL(qcom_cc_map);
void
qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
{
u32 val;
u32 mask;
/* De-assert reset to FSM */
regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
/* Program bias count and lock count */
val = bias_count << PLL_BIAS_COUNT_SHIFT |
lock_count << PLL_LOCK_COUNT_SHIFT;
mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
regmap_update_bits(map, reg, mask, val);
/* Enable PLL FSM voting */
regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
}
EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
static void qcom_cc_gdsc_unregister(void *data)
{
gdsc_unregister(data);
}
/*
* Backwards compatibility with old DTs. Register a pass-through factor 1/1
* clock to translate 'path' clk into 'name' clk and register the 'path'
* clk as a fixed rate clock if it isn't present.
*/
static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
const char *name, unsigned long rate,
bool add_factor)
{
struct device_node *node = NULL;
struct device_node *clocks_node;
struct clk_fixed_factor *factor;
struct clk_fixed_rate *fixed;
struct clk_init_data init_data = { };
int ret;
clocks_node = of_find_node_by_path("/clocks");
if (clocks_node) {
node = of_get_child_by_name(clocks_node, path);
of_node_put(clocks_node);
}
if (!node) {
fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
if (!fixed)
return -EINVAL;
fixed->fixed_rate = rate;
fixed->hw.init = &init_data;
init_data.name = path;
init_data.ops = &clk_fixed_rate_ops;
ret = devm_clk_hw_register(dev, &fixed->hw);
if (ret)
return ret;
}
of_node_put(node);
if (add_factor) {
factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
if (!factor)
return -EINVAL;
factor->mult = factor->div = 1;
factor->hw.init = &init_data;
init_data.name = name;
init_data.parent_names = &path;
init_data.num_parents = 1;
init_data.flags = 0;
init_data.ops = &clk_fixed_factor_ops;
ret = devm_clk_hw_register(dev, &factor->hw);
if (ret)
return ret;
}
return 0;
}
int qcom_cc_register_board_clk(struct device *dev, const char *path,
const char *name, unsigned long rate)
{
bool add_factor = true;
/*
* TODO: The RPM clock driver currently does not support the xo clock.
* When xo is added to the RPM clock driver, we should change this
* function to skip registration of xo factor clocks.
*/
return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
}
EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
int qcom_cc_register_sleep_clk(struct device *dev)
{
return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
32768, true);
}
EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
void *data)
{
struct qcom_cc *cc = data;
unsigned int idx = clkspec->args[0];
if (idx >= cc->num_rclks) {
pr_err("%s: invalid index %u\n", __func__, idx);
return ERR_PTR(-EINVAL);
}
return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
}
int qcom_cc_really_probe(struct platform_device *pdev,
const struct qcom_cc_desc *desc, struct regmap *regmap)
{
int i, ret;
struct device *dev = &pdev->dev;
struct qcom_reset_controller *reset;
struct qcom_cc *cc;
struct gdsc_desc *scd;
size_t num_clks = desc->num_clks;
struct clk_regmap **rclks = desc->clks;
cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
if (!cc)
return -ENOMEM;
cc->rclks = rclks;
cc->num_rclks = num_clks;
for (i = 0; i < num_clks; i++) {
if (!rclks[i])
continue;
ret = devm_clk_register_regmap(dev, rclks[i]);
if (ret)
return ret;
}
ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
if (ret)
return ret;
reset = &cc->reset;
reset->rcdev.of_node = dev->of_node;
reset->rcdev.ops = &qcom_reset_ops;
reset->rcdev.owner = dev->driver->owner;
reset->rcdev.nr_resets = desc->num_resets;
reset->regmap = regmap;
reset->reset_map = desc->resets;
ret = devm_reset_controller_register(dev, &reset->rcdev);
if (ret)
return ret;
if (desc->gdscs && desc->num_gdscs) {
scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
if (!scd)
return -ENOMEM;
scd->dev = dev;
scd->scs = desc->gdscs;
scd->num = desc->num_gdscs;
ret = gdsc_register(scd, &reset->rcdev, regmap);
if (ret)
return ret;
ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
scd);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
{
struct regmap *regmap;
regmap = qcom_cc_map(pdev, desc);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return qcom_cc_really_probe(pdev, desc, regmap);
}
EXPORT_SYMBOL_GPL(qcom_cc_probe);
MODULE_LICENSE("GPL v2");