pwm: Changes for v4.10-rc1

This is a very tiny pull request, with just a new driver for HiSilicon
 BVT SoCs and a cleanup for the Amlogic Meson driver.
 
 There are other patches on the list, but my timing was really bad this
 time and I ended up not having the time to look at them in enough detail
 to be comfortable merging them.
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Merge tag 'pwm/for-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm

Pull pwm updates from Thierry Reding:
 "This is a very tiny pull request, with just a new driver for HiSilicon
  BVT SoCs and a cleanup for the Amlogic Meson driver.

  There are other patches on the list, but my timing was really bad this
  time and I ended up not having the time to look at them in enough
  detail to be comfortable merging them"

* tag 'pwm/for-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm:
  pwm: Add PWM driver for HiSilicon BVT SOCs
  pwm: meson: Remove unneeded platform MODULE_ALIAS
This commit is contained in:
Linus Torvalds 2016-12-15 11:45:13 -08:00
commit 57d64e6f5f
5 changed files with 302 additions and 1 deletions

View File

@ -0,0 +1,21 @@
Hisilicon PWM controller
Required properties:
-compatible: should contain one SoC specific compatible string
The SoC specific strings supported including:
"hisilicon,hi3516cv300-pwm"
"hisilicon,hi3519v100-pwm"
- reg: physical base address and length of the controller's registers.
- clocks: phandle and clock specifier of the PWM reference clock.
- resets: phandle and reset specifier for the PWM controller reset.
- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
the cells format.
Example:
pwm: pwm@12130000 {
compatible = "hisilicon,hi3516cv300-pwm";
reg = <0x12130000 0x10000>;
clocks = <&crg_ctrl HI3516CV300_PWM_CLK>;
resets = <&crg_ctrl 0x38 0>;
#pwm-cells = <3>;
};

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@ -175,6 +175,15 @@ config PWM_FSL_FTM
To compile this driver as a module, choose M here: the module
will be called pwm-fsl-ftm.
config PWM_HIBVT
tristate "HiSilicon BVT PWM support"
depends on ARCH_HISI || COMPILE_TEST
help
Generic PWM framework driver for HiSilicon BVT SoCs.
To compile this driver as a module, choose M here: the module
will be called pwm-hibvt.
config PWM_IMG
tristate "Imagination Technologies PWM driver"
depends on HAS_IOMEM

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@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CRC) += pwm-crc.o
obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
obj-$(CONFIG_PWM_HIBVT) += pwm-hibvt.o
obj-$(CONFIG_PWM_IMG) += pwm-img.o
obj-$(CONFIG_PWM_IMX) += pwm-imx.o
obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o

271
drivers/pwm/pwm-hibvt.c Normal file
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@ -0,0 +1,271 @@
/*
* PWM Controller Driver for HiSilicon BVT SoCs
*
* Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/reset.h>
#define PWM_CFG0_ADDR(x) (((x) * 0x20) + 0x0)
#define PWM_CFG1_ADDR(x) (((x) * 0x20) + 0x4)
#define PWM_CFG2_ADDR(x) (((x) * 0x20) + 0x8)
#define PWM_CTRL_ADDR(x) (((x) * 0x20) + 0xC)
#define PWM_ENABLE_SHIFT 0
#define PWM_ENABLE_MASK BIT(0)
#define PWM_POLARITY_SHIFT 1
#define PWM_POLARITY_MASK BIT(1)
#define PWM_KEEP_SHIFT 2
#define PWM_KEEP_MASK BIT(2)
#define PWM_PERIOD_MASK GENMASK(31, 0)
#define PWM_DUTY_MASK GENMASK(31, 0)
struct hibvt_pwm_chip {
struct pwm_chip chip;
struct clk *clk;
void __iomem *base;
struct reset_control *rstc;
};
struct hibvt_pwm_soc {
u32 num_pwms;
};
static const struct hibvt_pwm_soc pwm_soc[2] = {
{ .num_pwms = 4 },
{ .num_pwms = 8 },
};
static inline struct hibvt_pwm_chip *to_hibvt_pwm_chip(struct pwm_chip *chip)
{
return container_of(chip, struct hibvt_pwm_chip, chip);
}
static void hibvt_pwm_set_bits(void __iomem *base, u32 offset,
u32 mask, u32 data)
{
void __iomem *address = base + offset;
u32 value;
value = readl(address);
value &= ~mask;
value |= (data & mask);
writel(value, address);
}
static void hibvt_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CTRL_ADDR(pwm->hwpwm),
PWM_ENABLE_MASK, 0x1);
}
static void hibvt_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CTRL_ADDR(pwm->hwpwm),
PWM_ENABLE_MASK, 0x0);
}
static void hibvt_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
int duty_cycle_ns, int period_ns)
{
struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
u32 freq, period, duty;
freq = div_u64(clk_get_rate(hi_pwm_chip->clk), 1000000);
period = div_u64(freq * period_ns, 1000);
duty = div_u64(period * duty_cycle_ns, period_ns);
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CFG0_ADDR(pwm->hwpwm),
PWM_PERIOD_MASK, period);
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CFG1_ADDR(pwm->hwpwm),
PWM_DUTY_MASK, duty);
}
static void hibvt_pwm_set_polarity(struct pwm_chip *chip,
struct pwm_device *pwm,
enum pwm_polarity polarity)
{
struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
if (polarity == PWM_POLARITY_INVERSED)
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CTRL_ADDR(pwm->hwpwm),
PWM_POLARITY_MASK, (0x1 << PWM_POLARITY_SHIFT));
else
hibvt_pwm_set_bits(hi_pwm_chip->base, PWM_CTRL_ADDR(pwm->hwpwm),
PWM_POLARITY_MASK, (0x0 << PWM_POLARITY_SHIFT));
}
static void hibvt_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state *state)
{
struct hibvt_pwm_chip *hi_pwm_chip = to_hibvt_pwm_chip(chip);
void __iomem *base;
u32 freq, value;
freq = div_u64(clk_get_rate(hi_pwm_chip->clk), 1000000);
base = hi_pwm_chip->base;
value = readl(base + PWM_CFG0_ADDR(pwm->hwpwm));
state->period = div_u64(value * 1000, freq);
value = readl(base + PWM_CFG1_ADDR(pwm->hwpwm));
state->duty_cycle = div_u64(value * 1000, freq);
value = readl(base + PWM_CTRL_ADDR(pwm->hwpwm));
state->enabled = (PWM_ENABLE_MASK & value);
}
static int hibvt_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state *state)
{
if (state->polarity != pwm->state.polarity)
hibvt_pwm_set_polarity(chip, pwm, state->polarity);
if (state->period != pwm->state.period ||
state->duty_cycle != pwm->state.duty_cycle)
hibvt_pwm_config(chip, pwm, state->duty_cycle, state->period);
if (state->enabled != pwm->state.enabled) {
if (state->enabled)
hibvt_pwm_enable(chip, pwm);
else
hibvt_pwm_disable(chip, pwm);
}
return 0;
}
static struct pwm_ops hibvt_pwm_ops = {
.get_state = hibvt_pwm_get_state,
.apply = hibvt_pwm_apply,
.owner = THIS_MODULE,
};
static int hibvt_pwm_probe(struct platform_device *pdev)
{
const struct hibvt_pwm_soc *soc =
of_device_get_match_data(&pdev->dev);
struct hibvt_pwm_chip *pwm_chip;
struct resource *res;
int ret;
int i;
pwm_chip = devm_kzalloc(&pdev->dev, sizeof(*pwm_chip), GFP_KERNEL);
if (pwm_chip == NULL)
return -ENOMEM;
pwm_chip->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pwm_chip->clk)) {
dev_err(&pdev->dev, "getting clock failed with %ld\n",
PTR_ERR(pwm_chip->clk));
return PTR_ERR(pwm_chip->clk);
}
pwm_chip->chip.ops = &hibvt_pwm_ops;
pwm_chip->chip.dev = &pdev->dev;
pwm_chip->chip.base = -1;
pwm_chip->chip.npwm = soc->num_pwms;
pwm_chip->chip.of_xlate = of_pwm_xlate_with_flags;
pwm_chip->chip.of_pwm_n_cells = 3;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pwm_chip->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pwm_chip->base))
return PTR_ERR(pwm_chip->base);
ret = clk_prepare_enable(pwm_chip->clk);
if (ret < 0)
return ret;
pwm_chip->rstc = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(pwm_chip->rstc)) {
clk_disable_unprepare(pwm_chip->clk);
return PTR_ERR(pwm_chip->rstc);
}
reset_control_assert(pwm_chip->rstc);
msleep(30);
reset_control_deassert(pwm_chip->rstc);
ret = pwmchip_add(&pwm_chip->chip);
if (ret < 0) {
clk_disable_unprepare(pwm_chip->clk);
return ret;
}
for (i = 0; i < pwm_chip->chip.npwm; i++) {
hibvt_pwm_set_bits(pwm_chip->base, PWM_CTRL_ADDR(i),
PWM_KEEP_MASK, (0x1 << PWM_KEEP_SHIFT));
}
platform_set_drvdata(pdev, pwm_chip);
return 0;
}
static int hibvt_pwm_remove(struct platform_device *pdev)
{
struct hibvt_pwm_chip *pwm_chip;
pwm_chip = platform_get_drvdata(pdev);
reset_control_assert(pwm_chip->rstc);
msleep(30);
reset_control_deassert(pwm_chip->rstc);
clk_disable_unprepare(pwm_chip->clk);
return pwmchip_remove(&pwm_chip->chip);
}
static const struct of_device_id hibvt_pwm_of_match[] = {
{ .compatible = "hisilicon,hi3516cv300-pwm", .data = &pwm_soc[0] },
{ .compatible = "hisilicon,hi3519v100-pwm", .data = &pwm_soc[1] },
{ }
};
MODULE_DEVICE_TABLE(of, hibvt_pwm_of_match);
static struct platform_driver hibvt_pwm_driver = {
.driver = {
.name = "hibvt-pwm",
.of_match_table = hibvt_pwm_of_match,
},
.probe = hibvt_pwm_probe,
.remove = hibvt_pwm_remove,
};
module_platform_driver(hibvt_pwm_driver);
MODULE_AUTHOR("Jian Yuan");
MODULE_DESCRIPTION("HiSilicon BVT SoCs PWM driver");
MODULE_LICENSE("GPL");

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@ -524,7 +524,6 @@ static struct platform_driver meson_pwm_driver = {
};
module_platform_driver(meson_pwm_driver);
MODULE_ALIAS("platform:meson-pwm");
MODULE_DESCRIPTION("Amlogic Meson PWM Generator driver");
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
MODULE_LICENSE("Dual BSD/GPL");