linux/drivers/clk/qcom/common.c
Jeffrey Hugo efd164b552 clk: qcom: Allow constant ratio freq tables for rcg
Some RCGs (the gfx_3d_src_clk in msm8998 for example) are basically just
some constant ratio from the input across the entire frequency range.  It
would be great if we could specify the frequency table as a single entry
constant ratio instead of a long list, ie:

	{ .src = P_GPUPLL0_OUT_EVEN, .pre_div = 3 },
        { }

So, lets support that.

We need to fix a corner case in qcom_find_freq() where if the freq table
is non-null, but has no frequencies, we end up returning an "entry" before
the table array, which is bad.  Then, we need ignore the freq from the
table, and instead base everything on the requested freq.

Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Link: https://lkml.kernel.org/r/20191031185715.15504-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2019-11-07 13:43:19 -08:00

333 lines
7.6 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
*/
#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;
if (!f->freq)
return f;
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);
/* Drop 'protected-clocks' from the list of clocks to register */
static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc)
{
struct device_node *np = dev->of_node;
struct property *prop;
const __be32 *p;
u32 i;
of_property_for_each_u32(np, "protected-clocks", prop, p, i) {
if (i >= cc->num_rclks)
continue;
cc->rclks[i] = NULL;
}
}
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 : NULL;
}
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;
size_t num_clk_hws = desc->num_clk_hws;
struct clk_hw **clk_hws = desc->clk_hws;
cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
if (!cc)
return -ENOMEM;
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;
}
cc->rclks = rclks;
cc->num_rclks = num_clks;
qcom_cc_drop_protected(dev, cc);
for (i = 0; i < num_clk_hws; i++) {
ret = devm_clk_hw_register(dev, clk_hws[i]);
if (ret)
return ret;
}
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;
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);
int qcom_cc_probe_by_index(struct platform_device *pdev, int index,
const struct qcom_cc_desc *desc)
{
struct regmap *regmap;
struct resource *res;
void __iomem *base;
res = platform_get_resource(pdev, IORESOURCE_MEM, index);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return -ENOMEM;
regmap = devm_regmap_init_mmio(&pdev->dev, base, desc->config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
return qcom_cc_really_probe(pdev, desc, regmap);
}
EXPORT_SYMBOL_GPL(qcom_cc_probe_by_index);
MODULE_LICENSE("GPL v2");