mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 14:11:52 +00:00
pwm: Changes for v3.15-rc1
The legacy HAVE_PWM Kconfig symbol is finally being retired. Thanks a lot to Sascha Hauer for doing that. Three new drivers are added: Freescale FTM, Cirrus Logic CLPS711X and Intel Low Power Subsystem. An assortment of fixes and cleanups rounds things off for this release cycle. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iQIcBAABAgAGBQJTPmXoAAoJEN0jrNd/PrOhSacQAKNpqWHpFdFuhqpO6dvmqYj3 dvf6EDMnNaOS+TjbCvwP5awAiBhTbJRaTclP1lXXXOnzHvzeeYWhS2ESp4Yl8mRx GRHj5OxmquaVPY5HN+6guVyCrgq4R2sxPU1P2VoPhhomhvP2VuEBbD/ddudC3e2k /e9BuBhUB9eaur6d+vKX7Bnz09wf+ASobgIisjyyqSYysDgE82BAanX/knnLIyQL RKCsz75w14rIxU/f8EML8EMnWiGINYpP+M/NGtPvcNBBOX9DkdzBvSvcbm+gS6ma g2P+zsJgxhUpvvmzhqUumADUU8BWo/P1Y/6FQGRku6EmmJQQspTvDvOs1jCauouC 5vUA41Jwh+4+AKeNWN28tDlh9i5kKYdzYP5SeRcM9mW1SI7AIFmg62lxdus7ZnBB e8UFd26kp/hZxXPdDVHtQi9y5Z5kn4axutVpbISuW5P9z1HF9bFOVHKQVlk7D6uz EqqiYLdW/MxrmBq+v35biwx6afk3zJ8Qas/MmVIVTcLcLDTFLPEm4EawwcRZo8F3 Jh4p4IHxjEgLYcwVBNOe4ZBJg10fM1gmh18dDTyri759HE1mpi4/DwTGcv3iK4AU njv4Q+qBq9QkY2ktw3qCkTDcwiM9jm+FHfdyKXeR5+CjfOf61/CF+N1jBQ8ZMrb7 XIRHle+mvL/RYpPDML/P =pbF+ -----END PGP SIGNATURE----- Merge tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm Pull pwm changes from Thierry Reding: "The legacy HAVE_PWM Kconfig symbol is finally being retired. Thanks a lot to Sascha Hauer for doing that. Three new drivers are added: Freescale FTM, Cirrus Logic CLPS711X and Intel Low Power Subsystem. An assortment of fixes and cleanups rounds things off for this release cycle" * tag 'pwm/for-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: pwm: pxa: Constify OF match table pwm: pxa: Fix typo "pwm" -> "PWM" Revert "pwm: pxa: Use of_match_ptr()" pwm: add support for Intel Low Power Subsystem PWM pwm: Add CLPS711X PWM support pwm: atmel: correct CDTY calculation pwm: atmel: Fix polarity handling Documentation: Add device tree bindings for Freescale FTM PWM. pwm: Add Freescale FTM PWM driver support pwm: pxa: Use of_match_ptr() pwm: samsung: Use SIMPLE_DEV_PM_OPS macro pwm: renesas-tpu: Add dependency on HAS_IOMEM pwm: Remove obsolete HAVE_PWM Kconfig symbol
This commit is contained in:
Linus Torvalds
commit
9712d3c377
@ -0,0 +1,16 @@
|
||||
* Cirris Logic CLPS711X PWM controller
|
||||
|
||||
Required properties:
|
||||
- compatible: Shall contain "cirrus,clps711x-pwm".
|
||||
- reg: Physical base address and length of the controller's registers.
|
||||
- clocks: phandle + clock specifier pair of the PWM reference clock.
|
||||
- #pwm-cells: Should be 1. The cell specifies the index of the channel.
|
||||
|
||||
Example:
|
||||
pwm: pwm@80000400 {
|
||||
compatible = "cirrus,ep7312-pwm",
|
||||
"cirrus,clps711x-pwm";
|
||||
reg = <0x80000400 0x4>;
|
||||
clocks = <&clks 8>;
|
||||
#pwm-cells = <1>;
|
||||
};
|
||||
35
Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
Normal file
35
Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
Normal file
@ -0,0 +1,35 @@
|
||||
Freescale FlexTimer Module (FTM) PWM controller
|
||||
|
||||
Required properties:
|
||||
- compatible: Should be "fsl,vf610-ftm-pwm".
|
||||
- reg: Physical base address and length of the controller's registers
|
||||
- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
|
||||
the cells format.
|
||||
- clock-names: Should include the following module clock source entries:
|
||||
"ftm_sys" (module clock, also can be used as counter clock),
|
||||
"ftm_ext" (external counter clock),
|
||||
"ftm_fix" (fixed counter clock),
|
||||
"ftm_cnt_clk_en" (external and fixed counter clock enable/disable).
|
||||
- clocks: Must contain a phandle and clock specifier for each entry in
|
||||
clock-names, please see clock/clock-bindings.txt for details of the property
|
||||
values.
|
||||
- pinctrl-names: Must contain a "default" entry.
|
||||
- pinctrl-NNN: One property must exist for each entry in pinctrl-names.
|
||||
See pinctrl/pinctrl-bindings.txt for details of the property values.
|
||||
|
||||
|
||||
Example:
|
||||
|
||||
pwm0: pwm@40038000 {
|
||||
compatible = "fsl,vf610-ftm-pwm";
|
||||
reg = <0x40038000 0x1000>;
|
||||
#pwm-cells = <3>;
|
||||
clock-names = "ftm_sys", "ftm_ext",
|
||||
"ftm_fix", "ftm_cnt_clk_en";
|
||||
clocks = <&clks VF610_CLK_FTM0>,
|
||||
<&clks VF610_CLK_FTM0_EXT_SEL>,
|
||||
<&clks VF610_CLK_FTM0_FIX_SEL>,
|
||||
<&clks VF610_CLK_FTM0_EXT_FIX_EN>;
|
||||
pinctrl-names = "default";
|
||||
pinctrl-0 = <&pinctrl_pwm0_1>;
|
||||
};
|
||||
@ -113,9 +113,6 @@ config ARM_DMA_IOMMU_ALIGNMENT
|
||||
|
||||
endif
|
||||
|
||||
config HAVE_PWM
|
||||
bool
|
||||
|
||||
config MIGHT_HAVE_PCI
|
||||
bool
|
||||
|
||||
@ -633,7 +630,6 @@ config ARCH_LPC32XX
|
||||
select CPU_ARM926T
|
||||
select GENERIC_CLOCKEVENTS
|
||||
select HAVE_IDE
|
||||
select HAVE_PWM
|
||||
select USE_OF
|
||||
help
|
||||
Support for the NXP LPC32XX family of processors
|
||||
|
||||
@ -7,7 +7,6 @@ comment "Intel/Marvell Dev Platforms (sorted by hardware release time)"
|
||||
config MACH_PXA3XX_DT
|
||||
bool "Support PXA3xx platforms from device tree"
|
||||
select CPU_PXA300
|
||||
select HAVE_PWM
|
||||
select POWER_SUPPLY
|
||||
select PXA3xx
|
||||
select USE_OF
|
||||
@ -23,12 +22,10 @@ config ARCH_LUBBOCK
|
||||
|
||||
config MACH_MAINSTONE
|
||||
bool "Intel HCDDBBVA0 Development Platform (aka Mainstone)"
|
||||
select HAVE_PWM
|
||||
select PXA27x
|
||||
|
||||
config MACH_ZYLONITE
|
||||
bool
|
||||
select HAVE_PWM
|
||||
select PXA3xx
|
||||
|
||||
config MACH_ZYLONITE300
|
||||
@ -123,7 +120,6 @@ config MACH_CM_X300
|
||||
bool "CompuLab CM-X300 modules"
|
||||
select CPU_PXA300
|
||||
select CPU_PXA310
|
||||
select HAVE_PWM
|
||||
select PXA3xx
|
||||
|
||||
config MACH_CAPC7117
|
||||
@ -214,7 +210,6 @@ config TRIZEPS_PCMCIA
|
||||
|
||||
config MACH_LOGICPD_PXA270
|
||||
bool "LogicPD PXA270 Card Engine Development Platform"
|
||||
select HAVE_PWM
|
||||
select PXA27x
|
||||
|
||||
config MACH_PCM027
|
||||
@ -225,7 +220,6 @@ config MACH_PCM027
|
||||
config MACH_PCM990_BASEBOARD
|
||||
bool "PHYTEC PCM-990 development board"
|
||||
depends on MACH_PCM027
|
||||
select HAVE_PWM
|
||||
|
||||
choice
|
||||
prompt "display on pcm990"
|
||||
@ -249,7 +243,6 @@ config MACH_COLIBRI
|
||||
config MACH_COLIBRI_PXA270_INCOME
|
||||
bool "Income s.r.o. PXA270 SBC"
|
||||
depends on MACH_COLIBRI
|
||||
select HAVE_PWM
|
||||
select PXA27x
|
||||
|
||||
config MACH_COLIBRI300
|
||||
@ -278,7 +271,6 @@ comment "End-user Products (sorted by vendor name)"
|
||||
|
||||
config MACH_H4700
|
||||
bool "HP iPAQ hx4700"
|
||||
select HAVE_PWM
|
||||
select IWMMXT
|
||||
select PXA27x
|
||||
|
||||
@ -292,14 +284,12 @@ config MACH_HIMALAYA
|
||||
|
||||
config MACH_MAGICIAN
|
||||
bool "Enable HTC Magician Support"
|
||||
select HAVE_PWM
|
||||
select IWMMXT
|
||||
select PXA27x
|
||||
|
||||
config MACH_MIOA701
|
||||
bool "Mitac Mio A701 Support"
|
||||
select GPIO_SYSFS
|
||||
select HAVE_PWM
|
||||
select IWMMXT
|
||||
select PXA27x
|
||||
help
|
||||
@ -309,7 +299,6 @@ config MACH_MIOA701
|
||||
|
||||
config PXA_EZX
|
||||
bool "Motorola EZX Platform"
|
||||
select HAVE_PWM
|
||||
select IWMMXT
|
||||
select PXA27x
|
||||
|
||||
@ -349,7 +338,6 @@ config MACH_MP900C
|
||||
|
||||
config ARCH_PXA_PALM
|
||||
bool "PXA based Palm PDAs"
|
||||
select HAVE_PWM
|
||||
|
||||
config MACH_PALM27X
|
||||
bool
|
||||
@ -447,7 +435,6 @@ config MACH_TREO680
|
||||
config MACH_RAUMFELD_RC
|
||||
bool "Raumfeld Controller"
|
||||
select CPU_PXA300
|
||||
select HAVE_PWM
|
||||
select POWER_SUPPLY
|
||||
select PXA3xx
|
||||
|
||||
@ -611,7 +598,6 @@ config MACH_E800
|
||||
|
||||
config MACH_ZIPIT2
|
||||
bool "Zipit Z2 Handheld"
|
||||
select HAVE_PWM
|
||||
select PXA27x
|
||||
endmenu
|
||||
|
||||
|
||||
@ -156,7 +156,7 @@ config INPUT_MAX8925_ONKEY
|
||||
|
||||
config INPUT_MAX8997_HAPTIC
|
||||
tristate "MAXIM MAX8997 haptic controller support"
|
||||
depends on PWM && HAVE_PWM && MFD_MAX8997
|
||||
depends on PWM && MFD_MAX8997
|
||||
select INPUT_FF_MEMLESS
|
||||
help
|
||||
This option enables device driver support for the haptic controller
|
||||
@ -470,7 +470,7 @@ config INPUT_PCF8574
|
||||
|
||||
config INPUT_PWM_BEEPER
|
||||
tristate "PWM beeper support"
|
||||
depends on PWM && HAVE_PWM
|
||||
depends on PWM
|
||||
help
|
||||
Say Y here to get support for PWM based beeper devices.
|
||||
|
||||
|
||||
@ -71,6 +71,15 @@ config PWM_BFIN
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-bfin.
|
||||
|
||||
config PWM_CLPS711X
|
||||
tristate "CLPS711X PWM support"
|
||||
depends on ARCH_CLPS711X || COMPILE_TEST
|
||||
help
|
||||
Generic PWM framework driver for Cirrus Logic CLPS711X.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-clps711x.
|
||||
|
||||
config PWM_EP93XX
|
||||
tristate "Cirrus Logic EP93xx PWM support"
|
||||
depends on ARCH_EP93XX
|
||||
@ -80,6 +89,16 @@ config PWM_EP93XX
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-ep93xx.
|
||||
|
||||
config PWM_FSL_FTM
|
||||
tristate "Freescale FlexTimer Module (FTM) PWM support"
|
||||
depends on OF
|
||||
help
|
||||
Generic FTM PWM framework driver for Freescale VF610 and
|
||||
Layerscape LS-1 SoCs.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-fsl-ftm.
|
||||
|
||||
config PWM_IMX
|
||||
tristate "i.MX PWM support"
|
||||
depends on ARCH_MXC
|
||||
@ -119,6 +138,16 @@ config PWM_LPC32XX
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-lpc32xx.
|
||||
|
||||
config PWM_LPSS
|
||||
tristate "Intel LPSS PWM support"
|
||||
depends on ACPI
|
||||
help
|
||||
Generic PWM framework driver for Intel Low Power Subsystem PWM
|
||||
controller.
|
||||
|
||||
To compile this driver as a module, choose M here: the module
|
||||
will be called pwm-lpss.
|
||||
|
||||
config PWM_MXS
|
||||
tristate "Freescale MXS PWM support"
|
||||
depends on ARCH_MXS && OF
|
||||
@ -160,6 +189,7 @@ config PWM_PXA
|
||||
config PWM_RENESAS_TPU
|
||||
tristate "Renesas TPU PWM support"
|
||||
depends on ARCH_SHMOBILE || COMPILE_TEST
|
||||
depends on HAS_IOMEM
|
||||
help
|
||||
This driver exposes the Timer Pulse Unit (TPU) PWM controller found
|
||||
in Renesas chips through the PWM API.
|
||||
|
||||
@ -4,11 +4,14 @@ obj-$(CONFIG_PWM_AB8500) += pwm-ab8500.o
|
||||
obj-$(CONFIG_PWM_ATMEL) += pwm-atmel.o
|
||||
obj-$(CONFIG_PWM_ATMEL_TCB) += pwm-atmel-tcb.o
|
||||
obj-$(CONFIG_PWM_BFIN) += pwm-bfin.o
|
||||
obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
|
||||
obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
|
||||
obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
|
||||
obj-$(CONFIG_PWM_IMX) += pwm-imx.o
|
||||
obj-$(CONFIG_PWM_JZ4740) += pwm-jz4740.o
|
||||
obj-$(CONFIG_PWM_LP3943) += pwm-lp3943.o
|
||||
obj-$(CONFIG_PWM_LPC32XX) += pwm-lpc32xx.o
|
||||
obj-$(CONFIG_PWM_LPSS) += pwm-lpss.o
|
||||
obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
|
||||
obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
|
||||
obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
|
||||
|
||||
@ -32,6 +32,7 @@
|
||||
/* Bit field in CMR */
|
||||
#define PWM_CMR_CPOL (1 << 9)
|
||||
#define PWM_CMR_UPD_CDTY (1 << 10)
|
||||
#define PWM_CMR_CPRE_MSK 0xF
|
||||
|
||||
/* The following registers for PWM v1 */
|
||||
#define PWMV1_CDTY 0x04
|
||||
@ -104,6 +105,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
unsigned long clk_rate, prd, dty;
|
||||
unsigned long long div;
|
||||
unsigned int pres = 0;
|
||||
u32 val;
|
||||
int ret;
|
||||
|
||||
if (test_bit(PWMF_ENABLED, &pwm->flags) && (period_ns != pwm->period)) {
|
||||
@ -131,7 +133,7 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
prd = div;
|
||||
div *= duty_ns;
|
||||
do_div(div, period_ns);
|
||||
dty = div;
|
||||
dty = prd - div;
|
||||
|
||||
ret = clk_enable(atmel_pwm->clk);
|
||||
if (ret) {
|
||||
@ -139,7 +141,10 @@ static int atmel_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
return ret;
|
||||
}
|
||||
|
||||
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, pres);
|
||||
/* It is necessary to preserve CPOL, inside CMR */
|
||||
val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
|
||||
val = (val & ~PWM_CMR_CPRE_MSK) | (pres & PWM_CMR_CPRE_MSK);
|
||||
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
|
||||
atmel_pwm->config(chip, pwm, dty, prd);
|
||||
|
||||
clk_disable(atmel_pwm->clk);
|
||||
|
||||
176
drivers/pwm/pwm-clps711x.c
Normal file
176
drivers/pwm/pwm-clps711x.c
Normal file
@ -0,0 +1,176 @@
|
||||
/*
|
||||
* Cirrus Logic CLPS711X PWM driver
|
||||
*
|
||||
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
|
||||
*
|
||||
* 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.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/pwm.h>
|
||||
|
||||
struct clps711x_chip {
|
||||
struct pwm_chip chip;
|
||||
void __iomem *pmpcon;
|
||||
struct clk *clk;
|
||||
spinlock_t lock;
|
||||
};
|
||||
|
||||
static inline struct clps711x_chip *to_clps711x_chip(struct pwm_chip *chip)
|
||||
{
|
||||
return container_of(chip, struct clps711x_chip, chip);
|
||||
}
|
||||
|
||||
static void clps711x_pwm_update_val(struct clps711x_chip *priv, u32 n, u32 v)
|
||||
{
|
||||
/* PWM0 - bits 4..7, PWM1 - bits 8..11 */
|
||||
u32 shift = (n + 1) * 4;
|
||||
unsigned long flags;
|
||||
u32 tmp;
|
||||
|
||||
spin_lock_irqsave(&priv->lock, flags);
|
||||
|
||||
tmp = readl(priv->pmpcon);
|
||||
tmp &= ~(0xf << shift);
|
||||
tmp |= v << shift;
|
||||
writel(tmp, priv->pmpcon);
|
||||
|
||||
spin_unlock_irqrestore(&priv->lock, flags);
|
||||
}
|
||||
|
||||
static unsigned int clps711x_get_duty(struct pwm_device *pwm, unsigned int v)
|
||||
{
|
||||
/* Duty cycle 0..15 max */
|
||||
return DIV_ROUND_CLOSEST(v * 0xf, pwm_get_period(pwm));
|
||||
}
|
||||
|
||||
static int clps711x_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
||||
unsigned int freq = clk_get_rate(priv->clk);
|
||||
|
||||
if (!freq)
|
||||
return -EINVAL;
|
||||
|
||||
/* Store constant period value */
|
||||
pwm_set_period(pwm, DIV_ROUND_CLOSEST(NSEC_PER_SEC, freq));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int clps711x_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
||||
unsigned int duty;
|
||||
|
||||
if (period_ns != pwm_get_period(pwm))
|
||||
return -EINVAL;
|
||||
|
||||
duty = clps711x_get_duty(pwm, duty_ns);
|
||||
clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int clps711x_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
||||
unsigned int duty;
|
||||
|
||||
duty = clps711x_get_duty(pwm, pwm_get_duty_cycle(pwm));
|
||||
clps711x_pwm_update_val(priv, pwm->hwpwm, duty);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void clps711x_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct clps711x_chip *priv = to_clps711x_chip(chip);
|
||||
|
||||
clps711x_pwm_update_val(priv, pwm->hwpwm, 0);
|
||||
}
|
||||
|
||||
static const struct pwm_ops clps711x_pwm_ops = {
|
||||
.request = clps711x_pwm_request,
|
||||
.config = clps711x_pwm_config,
|
||||
.enable = clps711x_pwm_enable,
|
||||
.disable = clps711x_pwm_disable,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static struct pwm_device *clps711x_pwm_xlate(struct pwm_chip *chip,
|
||||
const struct of_phandle_args *args)
|
||||
{
|
||||
if (args->args[0] >= chip->npwm)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
||||
return pwm_request_from_chip(chip, args->args[0], NULL);
|
||||
}
|
||||
|
||||
static int clps711x_pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct clps711x_chip *priv;
|
||||
struct resource *res;
|
||||
|
||||
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
|
||||
return -ENOMEM;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
priv->pmpcon = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(priv->pmpcon))
|
||||
return PTR_ERR(priv->pmpcon);
|
||||
|
||||
priv->clk = devm_clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(priv->clk))
|
||||
return PTR_ERR(priv->clk);
|
||||
|
||||
priv->chip.ops = &clps711x_pwm_ops;
|
||||
priv->chip.dev = &pdev->dev;
|
||||
priv->chip.base = -1;
|
||||
priv->chip.npwm = 2;
|
||||
priv->chip.of_xlate = clps711x_pwm_xlate;
|
||||
priv->chip.of_pwm_n_cells = 1;
|
||||
|
||||
spin_lock_init(&priv->lock);
|
||||
|
||||
platform_set_drvdata(pdev, priv);
|
||||
|
||||
return pwmchip_add(&priv->chip);
|
||||
}
|
||||
|
||||
static int clps711x_pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct clps711x_chip *priv = platform_get_drvdata(pdev);
|
||||
|
||||
return pwmchip_remove(&priv->chip);
|
||||
}
|
||||
|
||||
static const struct of_device_id __maybe_unused clps711x_pwm_dt_ids[] = {
|
||||
{ .compatible = "cirrus,clps711x-pwm", },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, clps711x_pwm_dt_ids);
|
||||
|
||||
static struct platform_driver clps711x_pwm_driver = {
|
||||
.driver = {
|
||||
.name = "clps711x-pwm",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(clps711x_pwm_dt_ids),
|
||||
},
|
||||
.probe = clps711x_pwm_probe,
|
||||
.remove = clps711x_pwm_remove,
|
||||
};
|
||||
module_platform_driver(clps711x_pwm_driver);
|
||||
|
||||
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
|
||||
MODULE_DESCRIPTION("Cirrus Logic CLPS711X PWM driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
495
drivers/pwm/pwm-fsl-ftm.c
Normal file
495
drivers/pwm/pwm-fsl-ftm.c
Normal file
@ -0,0 +1,495 @@
|
||||
/*
|
||||
* Freescale FlexTimer Module (FTM) PWM Driver
|
||||
*
|
||||
* Copyright 2012-2013 Freescale Semiconductor, Inc.
|
||||
*
|
||||
* 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.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/pwm.h>
|
||||
#include <linux/slab.h>
|
||||
|
||||
#define FTM_SC 0x00
|
||||
#define FTM_SC_CLK_MASK 0x3
|
||||
#define FTM_SC_CLK_SHIFT 3
|
||||
#define FTM_SC_CLK(c) (((c) + 1) << FTM_SC_CLK_SHIFT)
|
||||
#define FTM_SC_PS_MASK 0x7
|
||||
#define FTM_SC_PS_SHIFT 0
|
||||
|
||||
#define FTM_CNT 0x04
|
||||
#define FTM_MOD 0x08
|
||||
|
||||
#define FTM_CSC_BASE 0x0C
|
||||
#define FTM_CSC_MSB BIT(5)
|
||||
#define FTM_CSC_MSA BIT(4)
|
||||
#define FTM_CSC_ELSB BIT(3)
|
||||
#define FTM_CSC_ELSA BIT(2)
|
||||
#define FTM_CSC(_channel) (FTM_CSC_BASE + ((_channel) * 8))
|
||||
|
||||
#define FTM_CV_BASE 0x10
|
||||
#define FTM_CV(_channel) (FTM_CV_BASE + ((_channel) * 8))
|
||||
|
||||
#define FTM_CNTIN 0x4C
|
||||
#define FTM_STATUS 0x50
|
||||
|
||||
#define FTM_MODE 0x54
|
||||
#define FTM_MODE_FTMEN BIT(0)
|
||||
#define FTM_MODE_INIT BIT(2)
|
||||
#define FTM_MODE_PWMSYNC BIT(3)
|
||||
|
||||
#define FTM_SYNC 0x58
|
||||
#define FTM_OUTINIT 0x5C
|
||||
#define FTM_OUTMASK 0x60
|
||||
#define FTM_COMBINE 0x64
|
||||
#define FTM_DEADTIME 0x68
|
||||
#define FTM_EXTTRIG 0x6C
|
||||
#define FTM_POL 0x70
|
||||
#define FTM_FMS 0x74
|
||||
#define FTM_FILTER 0x78
|
||||
#define FTM_FLTCTRL 0x7C
|
||||
#define FTM_QDCTRL 0x80
|
||||
#define FTM_CONF 0x84
|
||||
#define FTM_FLTPOL 0x88
|
||||
#define FTM_SYNCONF 0x8C
|
||||
#define FTM_INVCTRL 0x90
|
||||
#define FTM_SWOCTRL 0x94
|
||||
#define FTM_PWMLOAD 0x98
|
||||
|
||||
enum fsl_pwm_clk {
|
||||
FSL_PWM_CLK_SYS,
|
||||
FSL_PWM_CLK_FIX,
|
||||
FSL_PWM_CLK_EXT,
|
||||
FSL_PWM_CLK_CNTEN,
|
||||
FSL_PWM_CLK_MAX
|
||||
};
|
||||
|
||||
struct fsl_pwm_chip {
|
||||
struct pwm_chip chip;
|
||||
|
||||
struct mutex lock;
|
||||
|
||||
unsigned int use_count;
|
||||
unsigned int cnt_select;
|
||||
unsigned int clk_ps;
|
||||
|
||||
void __iomem *base;
|
||||
|
||||
int period_ns;
|
||||
|
||||
struct clk *clk[FSL_PWM_CLK_MAX];
|
||||
};
|
||||
|
||||
static inline struct fsl_pwm_chip *to_fsl_chip(struct pwm_chip *chip)
|
||||
{
|
||||
return container_of(chip, struct fsl_pwm_chip, chip);
|
||||
}
|
||||
|
||||
static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
|
||||
return clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
}
|
||||
|
||||
static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
|
||||
clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
}
|
||||
|
||||
static int fsl_pwm_calculate_default_ps(struct fsl_pwm_chip *fpc,
|
||||
enum fsl_pwm_clk index)
|
||||
{
|
||||
unsigned long sys_rate, cnt_rate;
|
||||
unsigned long long ratio;
|
||||
|
||||
sys_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
if (!sys_rate)
|
||||
return -EINVAL;
|
||||
|
||||
cnt_rate = clk_get_rate(fpc->clk[fpc->cnt_select]);
|
||||
if (!cnt_rate)
|
||||
return -EINVAL;
|
||||
|
||||
switch (index) {
|
||||
case FSL_PWM_CLK_SYS:
|
||||
fpc->clk_ps = 1;
|
||||
break;
|
||||
case FSL_PWM_CLK_FIX:
|
||||
ratio = 2 * cnt_rate - 1;
|
||||
do_div(ratio, sys_rate);
|
||||
fpc->clk_ps = ratio;
|
||||
break;
|
||||
case FSL_PWM_CLK_EXT:
|
||||
ratio = 4 * cnt_rate - 1;
|
||||
do_div(ratio, sys_rate);
|
||||
fpc->clk_ps = ratio;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned long fsl_pwm_calculate_cycles(struct fsl_pwm_chip *fpc,
|
||||
unsigned long period_ns)
|
||||
{
|
||||
unsigned long long c, c0;
|
||||
|
||||
c = clk_get_rate(fpc->clk[fpc->cnt_select]);
|
||||
c = c * period_ns;
|
||||
do_div(c, 1000000000UL);
|
||||
|
||||
do {
|
||||
c0 = c;
|
||||
do_div(c0, (1 << fpc->clk_ps));
|
||||
if (c0 <= 0xFFFF)
|
||||
return (unsigned long)c0;
|
||||
} while (++fpc->clk_ps < 8);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned long fsl_pwm_calculate_period_cycles(struct fsl_pwm_chip *fpc,
|
||||
unsigned long period_ns,
|
||||
enum fsl_pwm_clk index)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = fsl_pwm_calculate_default_ps(fpc, index);
|
||||
if (ret) {
|
||||
dev_err(fpc->chip.dev,
|
||||
"failed to calculate default prescaler: %d\n",
|
||||
ret);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return fsl_pwm_calculate_cycles(fpc, period_ns);
|
||||
}
|
||||
|
||||
static unsigned long fsl_pwm_calculate_period(struct fsl_pwm_chip *fpc,
|
||||
unsigned long period_ns)
|
||||
{
|
||||
enum fsl_pwm_clk m0, m1;
|
||||
unsigned long fix_rate, ext_rate, cycles;
|
||||
|
||||
cycles = fsl_pwm_calculate_period_cycles(fpc, period_ns,
|
||||
FSL_PWM_CLK_SYS);
|
||||
if (cycles) {
|
||||
fpc->cnt_select = FSL_PWM_CLK_SYS;
|
||||
return cycles;
|
||||
}
|
||||
|
||||
fix_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_FIX]);
|
||||
ext_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_EXT]);
|
||||
|
||||
if (fix_rate > ext_rate) {
|
||||
m0 = FSL_PWM_CLK_FIX;
|
||||
m1 = FSL_PWM_CLK_EXT;
|
||||
} else {
|
||||
m0 = FSL_PWM_CLK_EXT;
|
||||
m1 = FSL_PWM_CLK_FIX;
|
||||
}
|
||||
|
||||
cycles = fsl_pwm_calculate_period_cycles(fpc, period_ns, m0);
|
||||
if (cycles) {
|
||||
fpc->cnt_select = m0;
|
||||
return cycles;
|
||||
}
|
||||
|
||||
fpc->cnt_select = m1;
|
||||
|
||||
return fsl_pwm_calculate_period_cycles(fpc, period_ns, m1);
|
||||
}
|
||||
|
||||
static unsigned long fsl_pwm_calculate_duty(struct fsl_pwm_chip *fpc,
|
||||
unsigned long period_ns,
|
||||
unsigned long duty_ns)
|
||||
{
|
||||
unsigned long long val, duty;
|
||||
|
||||
val = readl(fpc->base + FTM_MOD);
|
||||
duty = duty_ns * (val + 1);
|
||||
do_div(duty, period_ns);
|
||||
|
||||
return (unsigned long)duty;
|
||||
}
|
||||
|
||||
static int fsl_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
u32 val, period, duty;
|
||||
|
||||
mutex_lock(&fpc->lock);
|
||||
|
||||
/*
|
||||
* The Freescale FTM controller supports only a single period for
|
||||
* all PWM channels, therefore incompatible changes need to be
|
||||
* refused.
|
||||
*/
|
||||
if (fpc->period_ns && fpc->period_ns != period_ns) {
|
||||
dev_err(fpc->chip.dev,
|
||||
"conflicting period requested for PWM %u\n",
|
||||
pwm->hwpwm);
|
||||
mutex_unlock(&fpc->lock);
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
if (!fpc->period_ns && duty_ns) {
|
||||
period = fsl_pwm_calculate_period(fpc, period_ns);
|
||||
if (!period) {
|
||||
dev_err(fpc->chip.dev, "failed to calculate period\n");
|
||||
mutex_unlock(&fpc->lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
val = readl(fpc->base + FTM_SC);
|
||||
val &= ~(FTM_SC_PS_MASK << FTM_SC_PS_SHIFT);
|
||||
val |= fpc->clk_ps;
|
||||
writel(val, fpc->base + FTM_SC);
|
||||
writel(period - 1, fpc->base + FTM_MOD);
|
||||
|
||||
fpc->period_ns = period_ns;
|
||||
}
|
||||
|
||||
mutex_unlock(&fpc->lock);
|
||||
|
||||
duty = fsl_pwm_calculate_duty(fpc, period_ns, duty_ns);
|
||||
|
||||
writel(FTM_CSC_MSB | FTM_CSC_ELSB, fpc->base + FTM_CSC(pwm->hwpwm));
|
||||
writel(duty, fpc->base + FTM_CV(pwm->hwpwm));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fsl_pwm_set_polarity(struct pwm_chip *chip,
|
||||
struct pwm_device *pwm,
|
||||
enum pwm_polarity polarity)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
u32 val;
|
||||
|
||||
val = readl(fpc->base + FTM_POL);
|
||||
|
||||
if (polarity == PWM_POLARITY_INVERSED)
|
||||
val |= BIT(pwm->hwpwm);
|
||||
else
|
||||
val &= ~BIT(pwm->hwpwm);
|
||||
|
||||
writel(val, fpc->base + FTM_POL);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fsl_counter_clock_enable(struct fsl_pwm_chip *fpc)
|
||||
{
|
||||
u32 val;
|
||||
int ret;
|
||||
|
||||
if (fpc->use_count != 0)
|
||||
return 0;
|
||||
|
||||
/* select counter clock source */
|
||||
val = readl(fpc->base + FTM_SC);
|
||||
val &= ~(FTM_SC_CLK_MASK << FTM_SC_CLK_SHIFT);
|
||||
val |= FTM_SC_CLK(fpc->cnt_select);
|
||||
writel(val, fpc->base + FTM_SC);
|
||||
|
||||
ret = clk_prepare_enable(fpc->clk[fpc->cnt_select]);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);
|
||||
if (ret) {
|
||||
clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
|
||||
return ret;
|
||||
}
|
||||
|
||||
fpc->use_count++;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fsl_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
u32 val;
|
||||
int ret;
|
||||
|
||||
mutex_lock(&fpc->lock);
|
||||
val = readl(fpc->base + FTM_OUTMASK);
|
||||
val &= ~BIT(pwm->hwpwm);
|
||||
writel(val, fpc->base + FTM_OUTMASK);
|
||||
|
||||
ret = fsl_counter_clock_enable(fpc);
|
||||
mutex_unlock(&fpc->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void fsl_counter_clock_disable(struct fsl_pwm_chip *fpc)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
/*
|
||||
* already disabled, do nothing
|
||||
*/
|
||||
if (fpc->use_count == 0)
|
||||
return;
|
||||
|
||||
/* there are still users, so can't disable yet */
|
||||
if (--fpc->use_count > 0)
|
||||
return;
|
||||
|
||||
/* no users left, disable PWM counter clock */
|
||||
val = readl(fpc->base + FTM_SC);
|
||||
val &= ~(FTM_SC_CLK_MASK << FTM_SC_CLK_SHIFT);
|
||||
writel(val, fpc->base + FTM_SC);
|
||||
|
||||
clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
|
||||
clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
|
||||
}
|
||||
|
||||
static void fsl_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
|
||||
u32 val;
|
||||
|
||||
mutex_lock(&fpc->lock);
|
||||
val = readl(fpc->base + FTM_OUTMASK);
|
||||
val |= BIT(pwm->hwpwm);
|
||||
writel(val, fpc->base + FTM_OUTMASK);
|
||||
|
||||
fsl_counter_clock_disable(fpc);
|
||||
|
||||
val = readl(fpc->base + FTM_OUTMASK);
|
||||
|
||||
if ((val & 0xFF) == 0xFF)
|
||||
fpc->period_ns = 0;
|
||||
|
||||
mutex_unlock(&fpc->lock);
|
||||
}
|
||||
|
||||
static const struct pwm_ops fsl_pwm_ops = {
|
||||
.request = fsl_pwm_request,
|
||||
.free = fsl_pwm_free,
|
||||
.config = fsl_pwm_config,
|
||||
.set_polarity = fsl_pwm_set_polarity,
|
||||
.enable = fsl_pwm_enable,
|
||||
.disable = fsl_pwm_disable,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int fsl_pwm_init(struct fsl_pwm_chip *fpc)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
writel(0x00, fpc->base + FTM_CNTIN);
|
||||
writel(0x00, fpc->base + FTM_OUTINIT);
|
||||
writel(0xFF, fpc->base + FTM_OUTMASK);
|
||||
|
||||
clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fsl_pwm_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL);
|
||||
if (!fpc)
|
||||
return -ENOMEM;
|
||||
|
||||
mutex_init(&fpc->lock);
|
||||
|
||||
fpc->chip.dev = &pdev->dev;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
fpc->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(fpc->base))
|
||||
return PTR_ERR(fpc->base);
|
||||
|
||||
fpc->clk[FSL_PWM_CLK_SYS] = devm_clk_get(&pdev->dev, "ftm_sys");
|
||||
if (IS_ERR(fpc->clk[FSL_PWM_CLK_SYS])) {
|
||||
dev_err(&pdev->dev, "failed to get \"ftm_sys\" clock\n");
|
||||
return PTR_ERR(fpc->clk[FSL_PWM_CLK_SYS]);
|
||||
}
|
||||
|
||||
fpc->clk[FSL_PWM_CLK_FIX] = devm_clk_get(fpc->chip.dev, "ftm_fix");
|
||||
if (IS_ERR(fpc->clk[FSL_PWM_CLK_FIX]))
|
||||
return PTR_ERR(fpc->clk[FSL_PWM_CLK_FIX]);
|
||||
|
||||
fpc->clk[FSL_PWM_CLK_EXT] = devm_clk_get(fpc->chip.dev, "ftm_ext");
|
||||
if (IS_ERR(fpc->clk[FSL_PWM_CLK_EXT]))
|
||||
return PTR_ERR(fpc->clk[FSL_PWM_CLK_EXT]);
|
||||
|
||||
fpc->clk[FSL_PWM_CLK_CNTEN] =
|
||||
devm_clk_get(fpc->chip.dev, "ftm_cnt_clk_en");
|
||||
if (IS_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]))
|
||||
return PTR_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]);
|
||||
|
||||
fpc->chip.ops = &fsl_pwm_ops;
|
||||
fpc->chip.of_xlate = of_pwm_xlate_with_flags;
|
||||
fpc->chip.of_pwm_n_cells = 3;
|
||||
fpc->chip.base = -1;
|
||||
fpc->chip.npwm = 8;
|
||||
|
||||
ret = pwmchip_add(&fpc->chip);
|
||||
if (ret < 0) {
|
||||
dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, fpc);
|
||||
|
||||
return fsl_pwm_init(fpc);
|
||||
}
|
||||
|
||||
static int fsl_pwm_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct fsl_pwm_chip *fpc = platform_get_drvdata(pdev);
|
||||
|
||||
return pwmchip_remove(&fpc->chip);
|
||||
}
|
||||
|
||||
static const struct of_device_id fsl_pwm_dt_ids[] = {
|
||||
{ .compatible = "fsl,vf610-ftm-pwm", },
|
||||
{ /* sentinel */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids);
|
||||
|
||||
static struct platform_driver fsl_pwm_driver = {
|
||||
.driver = {
|
||||
.name = "fsl-ftm-pwm",
|
||||
.of_match_table = fsl_pwm_dt_ids,
|
||||
},
|
||||
.probe = fsl_pwm_probe,
|
||||
.remove = fsl_pwm_remove,
|
||||
};
|
||||
module_platform_driver(fsl_pwm_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Freescale FlexTimer Module PWM Driver");
|
||||
MODULE_AUTHOR("Xiubo Li <Li.Xiubo@freescale.com>");
|
||||
MODULE_ALIAS("platform:fsl-ftm-pwm");
|
||||
MODULE_LICENSE("GPL");
|
||||
183
drivers/pwm/pwm-lpss.c
Normal file
183
drivers/pwm/pwm-lpss.c
Normal file
@ -0,0 +1,183 @@
|
||||
/*
|
||||
* Intel Low Power Subsystem PWM controller driver
|
||||
*
|
||||
* Copyright (C) 2014, Intel Corporation
|
||||
* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
|
||||
* Author: Chew Kean Ho <kean.ho.chew@intel.com>
|
||||
* Author: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
|
||||
* Author: Chew Chiau Ee <chiau.ee.chew@intel.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/acpi.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pwm.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
#define PWM 0x00000000
|
||||
#define PWM_ENABLE BIT(31)
|
||||
#define PWM_SW_UPDATE BIT(30)
|
||||
#define PWM_BASE_UNIT_SHIFT 8
|
||||
#define PWM_BASE_UNIT_MASK 0x00ffff00
|
||||
#define PWM_ON_TIME_DIV_MASK 0x000000ff
|
||||
#define PWM_DIVISION_CORRECTION 0x2
|
||||
#define PWM_LIMIT (0x8000 + PWM_DIVISION_CORRECTION)
|
||||
#define NSECS_PER_SEC 1000000000UL
|
||||
|
||||
struct pwm_lpss_chip {
|
||||
struct pwm_chip chip;
|
||||
void __iomem *regs;
|
||||
struct clk *clk;
|
||||
};
|
||||
|
||||
static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
|
||||
{
|
||||
return container_of(chip, struct pwm_lpss_chip, chip);
|
||||
}
|
||||
|
||||
static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm = to_lpwm(chip);
|
||||
u8 on_time_div;
|
||||
unsigned long c;
|
||||
unsigned long long base_unit, freq = NSECS_PER_SEC;
|
||||
u32 ctrl;
|
||||
|
||||
do_div(freq, period_ns);
|
||||
|
||||
/* The equation is: base_unit = ((freq / c) * 65536) + correction */
|
||||
base_unit = freq * 65536;
|
||||
|
||||
c = clk_get_rate(lpwm->clk);
|
||||
if (!c)
|
||||
return -EINVAL;
|
||||
|
||||
do_div(base_unit, c);
|
||||
base_unit += PWM_DIVISION_CORRECTION;
|
||||
if (base_unit > PWM_LIMIT)
|
||||
return -EINVAL;
|
||||
|
||||
if (duty_ns <= 0)
|
||||
duty_ns = 1;
|
||||
on_time_div = 255 - (255 * duty_ns / period_ns);
|
||||
|
||||
ctrl = readl(lpwm->regs + PWM);
|
||||
ctrl &= ~(PWM_BASE_UNIT_MASK | PWM_ON_TIME_DIV_MASK);
|
||||
ctrl |= (u16) base_unit << PWM_BASE_UNIT_SHIFT;
|
||||
ctrl |= on_time_div;
|
||||
/* request PWM to update on next cycle */
|
||||
ctrl |= PWM_SW_UPDATE;
|
||||
writel(ctrl, lpwm->regs + PWM);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm = to_lpwm(chip);
|
||||
u32 ctrl;
|
||||
int ret;
|
||||
|
||||
ret = clk_prepare_enable(lpwm->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ctrl = readl(lpwm->regs + PWM);
|
||||
writel(ctrl | PWM_ENABLE, lpwm->regs + PWM);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm = to_lpwm(chip);
|
||||
u32 ctrl;
|
||||
|
||||
ctrl = readl(lpwm->regs + PWM);
|
||||
writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
|
||||
|
||||
clk_disable_unprepare(lpwm->clk);
|
||||
}
|
||||
|
||||
static const struct pwm_ops pwm_lpss_ops = {
|
||||
.config = pwm_lpss_config,
|
||||
.enable = pwm_lpss_enable,
|
||||
.disable = pwm_lpss_disable,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
|
||||
{ "80860F09", 0 },
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
|
||||
|
||||
static int pwm_lpss_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm;
|
||||
struct resource *r;
|
||||
int ret;
|
||||
|
||||
lpwm = devm_kzalloc(&pdev->dev, sizeof(*lpwm), GFP_KERNEL);
|
||||
if (!lpwm)
|
||||
return -ENOMEM;
|
||||
|
||||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
|
||||
lpwm->regs = devm_ioremap_resource(&pdev->dev, r);
|
||||
if (IS_ERR(lpwm->regs))
|
||||
return PTR_ERR(lpwm->regs);
|
||||
|
||||
lpwm->clk = devm_clk_get(&pdev->dev, NULL);
|
||||
if (IS_ERR(lpwm->clk)) {
|
||||
dev_err(&pdev->dev, "failed to get PWM clock\n");
|
||||
return PTR_ERR(lpwm->clk);
|
||||
}
|
||||
|
||||
lpwm->chip.dev = &pdev->dev;
|
||||
lpwm->chip.ops = &pwm_lpss_ops;
|
||||
lpwm->chip.base = -1;
|
||||
lpwm->chip.npwm = 1;
|
||||
|
||||
ret = pwmchip_add(&lpwm->chip);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, lpwm);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pwm_lpss_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
|
||||
u32 ctrl;
|
||||
|
||||
ctrl = readl(lpwm->regs + PWM);
|
||||
writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM);
|
||||
|
||||
return pwmchip_remove(&lpwm->chip);
|
||||
}
|
||||
|
||||
static struct platform_driver pwm_lpss_driver = {
|
||||
.driver = {
|
||||
.name = "pwm-lpss",
|
||||
.acpi_match_table = pwm_lpss_acpi_match,
|
||||
},
|
||||
.probe = pwm_lpss_probe,
|
||||
.remove = pwm_lpss_remove,
|
||||
};
|
||||
module_platform_driver(pwm_lpss_driver);
|
||||
|
||||
MODULE_DESCRIPTION("PWM driver for Intel LPSS");
|
||||
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:pwm-lpss");
|
||||
@ -127,12 +127,12 @@ static struct pwm_ops pxa_pwm_ops = {
|
||||
|
||||
#ifdef CONFIG_OF
|
||||
/*
|
||||
* Device tree users must create one device instance for each pwm channel.
|
||||
* Device tree users must create one device instance for each PWM channel.
|
||||
* Hence we dispense with the HAS_SECONDARY_PWM and "tell" the original driver
|
||||
* code that this is a single channel pxa25x-pwm. Currently all devices are
|
||||
* supported identically.
|
||||
*/
|
||||
static struct of_device_id pwm_of_match[] = {
|
||||
static const struct of_device_id pwm_of_match[] = {
|
||||
{ .compatible = "marvell,pxa250-pwm", .data = &pwm_id_table[0]},
|
||||
{ .compatible = "marvell,pxa270-pwm", .data = &pwm_id_table[0]},
|
||||
{ .compatible = "marvell,pxa168-pwm", .data = &pwm_id_table[0]},
|
||||
|
||||
@ -598,9 +598,8 @@ static int pwm_samsung_resume(struct device *dev)
|
||||
}
|
||||
#endif
|
||||
|
||||
static const struct dev_pm_ops pwm_samsung_pm_ops = {
|
||||
SET_SYSTEM_SLEEP_PM_OPS(pwm_samsung_suspend, pwm_samsung_resume)
|
||||
};
|
||||
static SIMPLE_DEV_PM_OPS(pwm_samsung_pm_ops, pwm_samsung_suspend,
|
||||
pwm_samsung_resume);
|
||||
|
||||
static struct platform_driver pwm_samsung_driver = {
|
||||
.driver = {
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
struct pwm_device;
|
||||
struct seq_file;
|
||||
|
||||
#if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM)
|
||||
#if IS_ENABLED(CONFIG_PWM)
|
||||
/*
|
||||
* pwm_request - request a PWM device
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user