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Commit a23086981723570c8952520d9ffaf6995d45f63e

Authored by H Hartley Sweeten 2013-10-16 09:40:03 +0800

Committed by Thierry Reding 2013-10-17 22:07:19 +0800

Exists in smarc-imx_3.14.28_1.0.0_ga and in 1 other branch

pwm: add ep93xx PWM support

Remove the non-standard EP93xx PWM driver in drivers/misc and add
a new driver for the PWM controllers on the EP93xx platform based
on the PWM framework.

These PWM controllers each support 1 PWM channel with programmable
duty cycle, frequency, and polarity inversion.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ryan Mallon <rmallon@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Showing 6 changed files with 240 additions and 300 deletions Inline Diff

drivers/misc/Kconfig
drivers/misc/Makefile
drivers/misc/ep93xx_pwm.c
drivers/pwm/Kconfig
drivers/pwm/Makefile
drivers/pwm/pwm-ep93xx.c

drivers/misc/Kconfig

Diff comments View file @ a230869

 #
 # Misc strange devices
 #
 menu "Misc devices"
 config SENSORS_LIS3LV02D
 	tristate
 	depends on INPUT
 	select INPUT_POLLDEV
 	default n
 config AD525X_DPOT
 	tristate "Analog Devices Digital Potentiometers"
 	depends on (I2C || SPI) && SYSFS
 	help
 	  If you say yes here, you get support for the Analog Devices
 	  AD5258, AD5259, AD5251, AD5252, AD5253, AD5254, AD5255
 	  AD5160, AD5161, AD5162, AD5165, AD5200, AD5201, AD5203,
 	  AD5204, AD5206, AD5207, AD5231, AD5232, AD5233, AD5235,
 	  AD5260, AD5262, AD5263, AD5290, AD5291, AD5292, AD5293,
 	  AD7376, AD8400, AD8402, AD8403, ADN2850, AD5241, AD5242,
 	  AD5243, AD5245, AD5246, AD5247, AD5248, AD5280, AD5282,
 	  ADN2860, AD5273, AD5171, AD5170, AD5172, AD5173, AD5270,
 	  AD5271, AD5272, AD5274
 	  digital potentiometer chips.
 	  See Documentation/misc-devices/ad525x_dpot.txt for the
 	  userspace interface.
 	  This driver can also be built as a module.  If so, the module
 	  will be called ad525x_dpot.
 config AD525X_DPOT_I2C
 	tristate "support I2C bus connection"
 	depends on AD525X_DPOT && I2C
 	help
 	  Say Y here if you have a digital potentiometers hooked to an I2C bus.
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad525x_dpot-i2c.
 config AD525X_DPOT_SPI
 	tristate "support SPI bus connection"
 	depends on AD525X_DPOT && SPI_MASTER
 	help
 	  Say Y here if you have a digital potentiometers hooked to an SPI bus.
 	  If unsure, say N (but it's safe to say "Y").
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad525x_dpot-spi.
 config ATMEL_PWM
 	tristate "Atmel AT32/AT91 PWM support"
 	depends on HAVE_CLK
 	help
 	  This option enables device driver support for the PWM channels
 	  on certain Atmel processors.  Pulse Width Modulation is used for
 	  purposes including software controlled power-efficient backlights
 	  on LCD displays, motor control, and waveform generation.
 config ATMEL_TCLIB
 	bool "Atmel AT32/AT91 Timer/Counter Library"
 	depends on (AVR32 || ARCH_AT91)
 	help
 	  Select this if you want a library to allocate the Timer/Counter
 	  blocks found on many Atmel processors.  This facilitates using
 	  these blocks by different drivers despite processor differences.
 config ATMEL_TCB_CLKSRC
 	bool "TC Block Clocksource"
 	depends on ATMEL_TCLIB
 	default y
 	help
 	  Select this to get a high precision clocksource based on a
 	  TC block with a 5+ MHz base clock rate.  Two timer channels
 	  are combined to make a single 32-bit timer.
 	  When GENERIC_CLOCKEVENTS is defined, the third timer channel
 	  may be used as a clock event device supporting oneshot mode
 	  (delays of up to two seconds) based on the 32 KiHz clock.
 config ATMEL_TCB_CLKSRC_BLOCK
 	int
 	depends on ATMEL_TCB_CLKSRC
 	prompt "TC Block" if ARCH_AT91RM9200 || ARCH_AT91SAM9260 || CPU_AT32AP700X
 	default 0
 	range 0 1
 	help
 	  Some chips provide more than one TC block, so you have the
 	  choice of which one to use for the clock framework.  The other
 	  TC can be used for other purposes, such as PWM generation and
 	  interval timing.
 config DUMMY_IRQ
 	tristate "Dummy IRQ handler"
 	default n
 	---help---
 	  This module accepts a single 'irq' parameter, which it should register for.
 	  The sole purpose of this module is to help with debugging of systems on
 	  which spurious IRQs would happen on disabled IRQ vector.
 config IBM_ASM
 	tristate "Device driver for IBM RSA service processor"
 	depends on X86 && PCI && INPUT
 	---help---
 	  This option enables device driver support for in-band access to the
 	  IBM RSA (Condor) service processor in eServer xSeries systems.
 	  The ibmasm device driver allows user space application to access
 	  ASM (Advanced Systems Management) functions on the service
 	  processor. The driver is meant to be used in conjunction with
 	  a user space API.
 	  The ibmasm driver also enables the OS to use the UART on the
 	  service processor board as a regular serial port. To make use of
 	  this feature serial driver support (CONFIG_SERIAL_8250) must be
 	  enabled.
 	  WARNING: This software may not be supported or function
 	  correctly on your IBM server. Please consult the IBM ServerProven
 	  website <http://www-03.ibm.com/systems/info/x86servers/serverproven/compat/us/>
 	  for information on the specific driver level and support statement
 	  for your IBM server.
 config PHANTOM
 	tristate "Sensable PHANToM (PCI)"
 	depends on PCI
 	help
 	  Say Y here if you want to build a driver for Sensable PHANToM device.
 	  This driver is only for PCI PHANToMs.
 	  If you choose to build module, its name will be phantom. If unsure,
 	  say N here.
 config INTEL_MID_PTI
 	tristate "Parallel Trace Interface for MIPI P1149.7 cJTAG standard"
 	depends on PCI && TTY && (X86_INTEL_MID || COMPILE_TEST)
 	default n
 	help
 	  The PTI (Parallel Trace Interface) driver directs
 	  trace data routed from various parts in the system out
 	  through an Intel Penwell PTI port and out of the mobile
 	  device for analysis with a debugging tool (Lauterbach or Fido).
 	  You should select this driver if the target kernel is meant for
 	  an Intel Atom (non-netbook) mobile device containing a MIPI
 	  P1149.7 standard implementation.
 config SGI_IOC4
 	tristate "SGI IOC4 Base IO support"
 	depends on PCI
 	---help---
 	  This option enables basic support for the IOC4 chip on certain
 	  SGI IO controller cards (IO9, IO10, and PCI-RT).  This option
 	  does not enable any specific functions on such a card, but provides
 	  necessary infrastructure for other drivers to utilize.
 	  If you have an SGI Altix with an IOC4-based card say Y.
 	  Otherwise say N.
 config TIFM_CORE
 	tristate "TI Flash Media interface support"
 	depends on PCI
 	help
 	  If you want support for Texas Instruments(R) Flash Media adapters
 	  you should select this option and then also choose an appropriate
 	  host adapter, such as 'TI Flash Media PCI74xx/PCI76xx host adapter
 	  support', if you have a TI PCI74xx compatible card reader, for
 	  example.
 	  You will also have to select some flash card format drivers. MMC/SD
 	  cards are supported via 'MMC/SD Card support: TI Flash Media MMC/SD
 	  Interface support (MMC_TIFM_SD)'.
 	  To compile this driver as a module, choose M here: the module will
 	  be called tifm_core.
 config TIFM_7XX1
 	tristate "TI Flash Media PCI74xx/PCI76xx host adapter support"
 	depends on PCI && TIFM_CORE
 	default TIFM_CORE
 	help
 	  This option enables support for Texas Instruments(R) PCI74xx and
 	  PCI76xx families of Flash Media adapters, found in many laptops.
 	  To make actual use of the device, you will have to select some
 	  flash card format drivers, as outlined in the TIFM_CORE Help.
 	  To compile this driver as a module, choose M here: the module will
 	  be called tifm_7xx1.
 config ICS932S401
 	tristate "Integrated Circuits ICS932S401"
 	depends on I2C
 	help
 	  If you say yes here you get support for the Integrated Circuits
 	  ICS932S401 clock control chips.
 	  This driver can also be built as a module. If so, the module
 	  will be called ics932s401.
 config ATMEL_SSC
 	tristate "Device driver for Atmel SSC peripheral"
 	depends on HAS_IOMEM
 	---help---
 	  This option enables device driver support for Atmel Synchronized
 	  Serial Communication peripheral (SSC).
 	  The SSC peripheral supports a wide variety of serial frame based
 	  communications, i.e. I2S, SPI, etc.
 	  If unsure, say N.
 config ENCLOSURE_SERVICES
 	tristate "Enclosure Services"
 	default n
 	help
 	  Provides support for intelligent enclosures (bays which
 	  contain storage devices).  You also need either a host
 	  driver (SCSI/ATA) which supports enclosures
 	  or a SCSI enclosure device (SES) to use these services.
 config SGI_XP
 	tristate "Support communication between SGI SSIs"
 	depends on NET
 	depends on (IA64_GENERIC || IA64_SGI_SN2 || IA64_SGI_UV || X86_UV) && SMP
 	select IA64_UNCACHED_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
 	select GENERIC_ALLOCATOR if IA64_GENERIC || IA64_SGI_SN2
 	select SGI_GRU if X86_64 && SMP
 	---help---
 	  An SGI machine can be divided into multiple Single System
 	  Images which act independently of each other and have
 	  hardware based memory protection from the others.  Enabling
 	  this feature will allow for direct communication between SSIs
 	  based on a network adapter and DMA messaging.
 config CS5535_MFGPT
 	tristate "CS5535/CS5536 Geode Multi-Function General Purpose Timer (MFGPT) support"
 	depends on PCI && X86 && MFD_CS5535
 	default n
 	help
 	  This driver provides access to MFGPT functionality for other
 	  drivers that need timers.  MFGPTs are available in the CS5535 and
 	  CS5536 companion chips that are found in AMD Geode and several
 	  other platforms.  They have a better resolution and max interval
 	  than the generic PIT, and are suitable for use as high-res timers.
 	  You probably don't want to enable this manually; other drivers that
 	  make use of it should enable it.
 config CS5535_MFGPT_DEFAULT_IRQ
 	int
 	depends on CS5535_MFGPT
 	default 7
 	help
 	  MFGPTs on the CS5535 require an interrupt.  The selected IRQ
 	  can be overridden as a module option as well as by driver that
 	  use the cs5535_mfgpt_ API; however, different architectures might
 	  want to use a different IRQ by default.  This is here for
 	  architectures to set as necessary.
 config CS5535_CLOCK_EVENT_SRC
 	tristate "CS5535/CS5536 high-res timer (MFGPT) events"
 	depends on GENERIC_CLOCKEVENTS && CS5535_MFGPT
 	help
 	  This driver provides a clock event source based on the MFGPT
 	  timer(s) in the CS5535 and CS5536 companion chips.
 	  MFGPTs have a better resolution and max interval than the
 	  generic PIT, and are suitable for use as high-res timers.
 config HP_ILO
 	tristate "Channel interface driver for the HP iLO processor"
 	depends on PCI
 	default n
 	help
 	  The channel interface driver allows applications to communicate
 	  with iLO management processors present on HP ProLiant servers.
 	  Upon loading, the driver creates /dev/hpilo/dXccbN files, which
 	  can be used to gather data from the management processor, via
 	  read and write system calls.
 	  To compile this driver as a module, choose M here: the
 	  module will be called hpilo.
 config SGI_GRU
 	tristate "SGI GRU driver"
 	depends on X86_UV && SMP
 	default n
 	select MMU_NOTIFIER
 	---help---
 	The GRU is a hardware resource located in the system chipset. The GRU
 	contains memory that can be mmapped into the user address space. This memory is
 	used to communicate with the GRU to perform functions such as load/store,
 	scatter/gather, bcopy, AMOs, etc.  The GRU is directly accessed by user
 	instructions using user virtual addresses. GRU instructions (ex., bcopy) use
 	user virtual addresses for operands.
 	If you are not running on a SGI UV system, say N.
 config SGI_GRU_DEBUG
 	bool  "SGI GRU driver debug"
 	depends on SGI_GRU
 	default n
 	---help---
 	This option enables addition debugging code for the SGI GRU driver. If
 	you are unsure, say N.
 config APDS9802ALS
 	tristate "Medfield Avago APDS9802 ALS Sensor module"
 	depends on I2C
 	help
 	  If you say yes here you get support for the ALS APDS9802 ambient
 	  light sensor.
 	  This driver can also be built as a module.  If so, the module
 	  will be called apds9802als.
 config ISL29003
 	tristate "Intersil ISL29003 ambient light sensor"
 	depends on I2C && SYSFS
 	help
 	  If you say yes here you get support for the Intersil ISL29003
 	  ambient light sensor.
 	  This driver can also be built as a module.  If so, the module
 	  will be called isl29003.
 config ISL29020
 	tristate "Intersil ISL29020 ambient light sensor"
 	depends on I2C
 	help
 	  If you say yes here you get support for the Intersil ISL29020
 	  ambient light sensor.
 	  This driver can also be built as a module.  If so, the module
 	  will be called isl29020.
 config SENSORS_TSL2550
 	tristate "Taos TSL2550 ambient light sensor"
 	depends on I2C && SYSFS
 	help
 	  If you say yes here you get support for the Taos TSL2550
 	  ambient light sensor.
 	  This driver can also be built as a module.  If so, the module
 	  will be called tsl2550.
 config SENSORS_BH1780
 	tristate "ROHM BH1780GLI ambient light sensor"
 	depends on I2C && SYSFS
 	help
 	  If you say yes here you get support for the ROHM BH1780GLI
 	  ambient light sensor.
 	  This driver can also be built as a module.  If so, the module
 	  will be called bh1780gli.
 config SENSORS_BH1770
          tristate "BH1770GLC / SFH7770 combined ALS - Proximity sensor"
          depends on I2C
          ---help---
            Say Y here if you want to build a driver for BH1770GLC (ROHM) or
 	   SFH7770 (Osram) combined ambient light and proximity sensor chip.
            To compile this driver as a module, choose M here: the
            module will be called bh1770glc. If unsure, say N here.
 config SENSORS_APDS990X
 	 tristate "APDS990X combined als and proximity sensors"
 	 depends on I2C
 	 default n
 	 ---help---
 	   Say Y here if you want to build a driver for Avago APDS990x
 	   combined ambient light and proximity sensor chip.
 	   To compile this driver as a module, choose M here: the
 	   module will be called apds990x. If unsure, say N here.
 config HMC6352
 	tristate "Honeywell HMC6352 compass"
 	depends on I2C
 	help
 	  This driver provides support for the Honeywell HMC6352 compass,
 	  providing configuration and heading data via sysfs.
-config EP93XX_PWM
-	tristate "EP93xx PWM support"
-	depends on ARCH_EP93XX
-	help
-	  This option enables device driver support for the PWM channels
-	  on the Cirrus EP93xx processors.  The EP9307 chip only has one
-	  PWM channel all the others have two, the second channel is an
-	  alternate function of the EGPIO14 pin.  A sysfs interface is
-	  provided to control the PWM channels.
-	  To compile this driver as a module, choose M here: the module will
-	  be called ep93xx_pwm.
 config DS1682
 	tristate "Dallas DS1682 Total Elapsed Time Recorder with Alarm"
 	depends on I2C
 	help
 	  If you say yes here you get support for Dallas Semiconductor
 	  DS1682 Total Elapsed Time Recorder.
 	  This driver can also be built as a module.  If so, the module
 	  will be called ds1682.
 config SPEAR13XX_PCIE_GADGET
 	bool "PCIe gadget support for SPEAr13XX platform"
 	depends on ARCH_SPEAR13XX && BROKEN
 	default n
 	help
 	 This option enables gadget support for PCIe controller. If
 	 board file defines any controller as PCIe endpoint then a sysfs
 	 entry will be created for that controller. User can use these
 	 sysfs node to configure PCIe EP as per his requirements.
 config TI_DAC7512
 	tristate "Texas Instruments DAC7512"
 	depends on SPI && SYSFS
 	help
 	  If you say yes here you get support for the Texas Instruments
 	  DAC7512 16-bit digital-to-analog converter.
 	  This driver can also be built as a module. If so, the module
 	  will be called ti_dac7512.
 config VMWARE_BALLOON
 	tristate "VMware Balloon Driver"
 	depends on X86 && HYPERVISOR_GUEST
 	help
 	  This is VMware physical memory management driver which acts
 	  like a "balloon" that can be inflated to reclaim physical pages
 	  by reserving them in the guest and invalidating them in the
 	  monitor, freeing up the underlying machine pages so they can
 	  be allocated to other guests. The balloon can also be deflated
 	  to allow the guest to use more physical memory.
 	  If unsure, say N.
 	  To compile this driver as a module, choose M here: the
 	  module will be called vmw_balloon.
 config ARM_CHARLCD
 	bool "ARM Ltd. Character LCD Driver"
 	depends on PLAT_VERSATILE
 	help
 	  This is a driver for the character LCD found on the ARM Ltd.
 	  Versatile and RealView Platform Baseboards. It doesn't do
 	  very much more than display the text "ARM Linux" on the first
 	  line and the Linux version on the second line, but that's
 	  still useful.
 config BMP085
 	bool
 	depends on SYSFS
 config BMP085_I2C
 	tristate "BMP085 digital pressure sensor on I2C"
 	select BMP085
 	select REGMAP_I2C
 	depends on I2C && SYSFS
 	help
 	  Say Y here if you want to support Bosch Sensortec's digital pressure
 	  sensor hooked to an I2C bus.
 	  To compile this driver as a module, choose M here: the
 	  module will be called bmp085-i2c.
 config BMP085_SPI
 	tristate "BMP085 digital pressure sensor on SPI"
 	select BMP085
 	select REGMAP_SPI
 	depends on SPI_MASTER && SYSFS
 	help
 	  Say Y here if you want to support Bosch Sensortec's digital pressure
 	  sensor hooked to an SPI bus.
 	  To compile this driver as a module, choose M here: the
 	  module will be called bmp085-spi.
 config PCH_PHUB
 	tristate "Intel EG20T PCH/LAPIS Semicon IOH(ML7213/ML7223/ML7831) PHUB"
 	select GENERIC_NET_UTILS
 	depends on PCI
 	help
 	  This driver is for PCH(Platform controller Hub) PHUB(Packet Hub) of
 	  Intel Topcliff which is an IOH(Input/Output Hub) for x86 embedded
 	  processor. The Topcliff has MAC address and Option ROM data in SROM.
 	  This driver can access MAC address and Option ROM data in SROM.
 	  This driver also can be used for LAPIS Semiconductor's IOH,
 	  ML7213/ML7223/ML7831.
 	  ML7213 which is for IVI(In-Vehicle Infotainment) use.
 	  ML7223 IOH is for MP(Media Phone) use.
 	  ML7831 IOH is for general purpose use.
 	  ML7213/ML7223/ML7831 is companion chip for Intel Atom E6xx series.
 	  ML7213/ML7223/ML7831 is completely compatible for Intel EG20T PCH.
 	  To compile this driver as a module, choose M here: the module will
 	  be called pch_phub.
 config USB_SWITCH_FSA9480
 	tristate "FSA9480 USB Switch"
 	depends on I2C
 	help
 	  The FSA9480 is a USB port accessory detector and switch.
 	  The FSA9480 is fully controlled using I2C and enables USB data,
 	  stereo and mono audio, video, microphone and UART data to use
 	  a common connector port.
 config LATTICE_ECP3_CONFIG
 	tristate "Lattice ECP3 FPGA bitstream configuration via SPI"
 	depends on SPI && SYSFS
 	select FW_LOADER
 	default	n
 	help
 	  This option enables support for bitstream configuration (programming
 	  or loading) of the Lattice ECP3 FPGA family via SPI.
 	  If unsure, say N.
 config SRAM
 	bool "Generic on-chip SRAM driver"
 	depends on HAS_IOMEM
 	select GENERIC_ALLOCATOR
 	help
 	  This driver allows you to declare a memory region to be managed by
 	  the genalloc API. It is supposed to be used for small on-chip SRAM
 	  areas found on many SoCs.
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
 source "drivers/misc/ti-st/Kconfig"
 source "drivers/misc/lis3lv02d/Kconfig"
 source "drivers/misc/carma/Kconfig"
 source "drivers/misc/altera-stapl/Kconfig"
 source "drivers/misc/mei/Kconfig"
 source "drivers/misc/vmw_vmci/Kconfig"
 endmenu

drivers/misc/Makefile

Diff comments View file @ a230869

 #
 # Makefile for misc devices that really don't fit anywhere else.
 #
 obj-$(CONFIG_IBM_ASM)		+= ibmasm/
 obj-$(CONFIG_AD525X_DPOT)	+= ad525x_dpot.o
 obj-$(CONFIG_AD525X_DPOT_I2C)	+= ad525x_dpot-i2c.o
 obj-$(CONFIG_AD525X_DPOT_SPI)	+= ad525x_dpot-spi.o
 obj-$(CONFIG_INTEL_MID_PTI)	+= pti.o
 obj-$(CONFIG_ATMEL_PWM)		+= atmel_pwm.o
 obj-$(CONFIG_ATMEL_SSC)		+= atmel-ssc.o
 obj-$(CONFIG_ATMEL_TCLIB)	+= atmel_tclib.o
 obj-$(CONFIG_BMP085)		+= bmp085.o
 obj-$(CONFIG_BMP085_I2C)	+= bmp085-i2c.o
 obj-$(CONFIG_BMP085_SPI)	+= bmp085-spi.o
 obj-$(CONFIG_DUMMY_IRQ)		+= dummy-irq.o
 obj-$(CONFIG_ICS932S401)	+= ics932s401.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
 obj-$(CONFIG_PHANTOM)		+= phantom.o
 obj-$(CONFIG_SENSORS_BH1780)	+= bh1780gli.o
 obj-$(CONFIG_SENSORS_BH1770)	+= bh1770glc.o
 obj-$(CONFIG_SENSORS_APDS990X)	+= apds990x.o
 obj-$(CONFIG_SGI_IOC4)		+= ioc4.o
 obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
 obj-$(CONFIG_KGDB_TESTS)	+= kgdbts.o
 obj-$(CONFIG_SGI_XP)		+= sgi-xp/
 obj-$(CONFIG_SGI_GRU)		+= sgi-gru/
 obj-$(CONFIG_CS5535_MFGPT)	+= cs5535-mfgpt.o
 obj-$(CONFIG_HP_ILO)		+= hpilo.o
 obj-$(CONFIG_APDS9802ALS)	+= apds9802als.o
 obj-$(CONFIG_ISL29003)		+= isl29003.o
 obj-$(CONFIG_ISL29020)		+= isl29020.o
 obj-$(CONFIG_SENSORS_TSL2550)	+= tsl2550.o
-obj-$(CONFIG_EP93XX_PWM)	+= ep93xx_pwm.o
 obj-$(CONFIG_DS1682)		+= ds1682.o
 obj-$(CONFIG_TI_DAC7512)	+= ti_dac7512.o
 obj-$(CONFIG_C2PORT)		+= c2port/
 obj-$(CONFIG_HMC6352)		+= hmc6352.o
 obj-y				+= eeprom/
 obj-y				+= cb710/
 obj-$(CONFIG_SPEAR13XX_PCIE_GADGET)	+= spear13xx_pcie_gadget.o
 obj-$(CONFIG_VMWARE_BALLOON)	+= vmw_balloon.o
 obj-$(CONFIG_ARM_CHARLCD)	+= arm-charlcd.o
 obj-$(CONFIG_PCH_PHUB)		+= pch_phub.o
 obj-y				+= ti-st/
 obj-y				+= lis3lv02d/
 obj-y				+= carma/
 obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
 obj-$(CONFIG_ALTERA_STAPL)	+=altera-stapl/
 obj-$(CONFIG_INTEL_MEI)		+= mei/
 obj-$(CONFIG_VMWARE_VMCI)	+= vmw_vmci/
 obj-$(CONFIG_LATTICE_ECP3_CONFIG)	+= lattice-ecp3-config.o
 obj-$(CONFIG_SRAM)		+= sram.o

drivers/misc/ep93xx_pwm.c

View file @ a230869

1	/*		File was deleted
2	* Simple PWM driver for EP93XX
3	*
4	* (c) Copyright 2009 Matthieu Crapet <mcrapet@gmail.com>
5	* (c) Copyright 2009 H Hartley Sweeten <hsweeten@visionengravers.com>
6	*
7	* This program is free software; you can redistribute it and/or
8	* modify it under the terms of the GNU General Public License
9	* as published by the Free Software Foundation; either version
10	* 2 of the License, or (at your option) any later version.
11	*
12	* EP9307 has only one channel:
13	* - PWMOUT
14	*
15	* EP9301/02/12/15 have two channels:
16	* - PWMOUT
17	* - PWMOUT1 (alternate function for EGPIO14)
18	*/
19
20	#include <linux/module.h>
21	#include <linux/platform_device.h>
22	#include <linux/slab.h>
23	#include <linux/clk.h>
24	#include <linux/err.h>
25	#include <linux/io.h>
26
27	#include <mach/platform.h>
28
29	#define EP93XX_PWMx_TERM_COUNT 0x00
30	#define EP93XX_PWMx_DUTY_CYCLE 0x04
31	#define EP93XX_PWMx_ENABLE 0x08
32	#define EP93XX_PWMx_INVERT 0x0C
33
34	#define EP93XX_PWM_MAX_COUNT 0xFFFF
35
36	struct ep93xx_pwm {
37	void __iomem *mmio_base;
38	struct clk *clk;
39	u32 duty_percent;
40	};
41
42	/*
43	* /sys/devices/platform/ep93xx-pwm.N
44	* /min_freq read-only minimum pwm output frequency
45	* /max_req read-only maximum pwm output frequency
46	* /freq read-write pwm output frequency (0 = disable output)
47	* /duty_percent read-write pwm duty cycle percent (1..99)
48	* /invert read-write invert pwm output
49	*/
50
51	static ssize_t ep93xx_pwm_get_min_freq(struct device *dev,
52	struct device_attribute attr, char buf)
53	{
54	struct platform_device *pdev = to_platform_device(dev);
55	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
56	unsigned long rate = clk_get_rate(pwm->clk);
57
58	return sprintf(buf, "%ld\n", rate / (EP93XX_PWM_MAX_COUNT + 1));
59	}
60
61	static ssize_t ep93xx_pwm_get_max_freq(struct device *dev,
62	struct device_attribute attr, char buf)
63	{
64	struct platform_device *pdev = to_platform_device(dev);
65	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
66	unsigned long rate = clk_get_rate(pwm->clk);
67
68	return sprintf(buf, "%ld\n", rate / 2);
69	}
70
71	static ssize_t ep93xx_pwm_get_freq(struct device *dev,
72	struct device_attribute attr, char buf)
73	{
74	struct platform_device *pdev = to_platform_device(dev);
75	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
76
77	if (readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1) {
78	unsigned long rate = clk_get_rate(pwm->clk);
79	u16 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
80
81	return sprintf(buf, "%ld\n", rate / (term + 1));
82	} else {
83	return sprintf(buf, "disabled\n");
84	}
85	}
86
87	static ssize_t ep93xx_pwm_set_freq(struct device *dev,
88	struct device_attribute attr, const char buf, size_t count)
89	{
90	struct platform_device *pdev = to_platform_device(dev);
91	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
92	long val;
93	int err;
94
95	err = kstrtol(buf, 10, &val);
96	if (err)
97	return -EINVAL;
98
99	if (val == 0) {
100	writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
101	} else if (val <= (clk_get_rate(pwm->clk) / 2)) {
102	u32 term, duty;
103
104	val = (clk_get_rate(pwm->clk) / val) - 1;
105	if (val > EP93XX_PWM_MAX_COUNT)
106	val = EP93XX_PWM_MAX_COUNT;
107	if (val < 1)
108	val = 1;
109
110	term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
111	duty = ((val + 1) * pwm->duty_percent / 100) - 1;
112
113	/* If pwm is running, order is important */
114	if (val > term) {
115	writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
116	writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
117	} else {
118	writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
119	writel(val, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
120	}
121
122	if (!readl(pwm->mmio_base + EP93XX_PWMx_ENABLE) & 0x1)
123	writel(0x1, pwm->mmio_base + EP93XX_PWMx_ENABLE);
124	} else {
125	return -EINVAL;
126	}
127
128	return count;
129	}
130
131	static ssize_t ep93xx_pwm_get_duty_percent(struct device *dev,
132	struct device_attribute attr, char buf)
133	{
134	struct platform_device *pdev = to_platform_device(dev);
135	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
136
137	return sprintf(buf, "%d\n", pwm->duty_percent);
138	}
139
140	static ssize_t ep93xx_pwm_set_duty_percent(struct device *dev,
141	struct device_attribute attr, const char buf, size_t count)
142	{
143	struct platform_device *pdev = to_platform_device(dev);
144	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
145	long val;
146	int err;
147
148	err = kstrtol(buf, 10, &val);
149	if (err)
150	return -EINVAL;
151
152	if (val > 0 && val < 100) {
153	u32 term = readl(pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
154	u32 duty = ((term + 1) * val / 100) - 1;
155
156	writel(duty, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
157	pwm->duty_percent = val;
158	return count;
159	}
160
161	return -EINVAL;
162	}
163
164	static ssize_t ep93xx_pwm_get_invert(struct device *dev,
165	struct device_attribute attr, char buf)
166	{
167	struct platform_device *pdev = to_platform_device(dev);
168	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
169	int inverted = readl(pwm->mmio_base + EP93XX_PWMx_INVERT) & 0x1;
170
171	return sprintf(buf, "%d\n", inverted);
172	}
173
174	static ssize_t ep93xx_pwm_set_invert(struct device *dev,
175	struct device_attribute attr, const char buf, size_t count)
176	{
177	struct platform_device *pdev = to_platform_device(dev);
178	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
179	long val;
180	int err;
181
182	err = kstrtol(buf, 10, &val);
183	if (err)
184	return -EINVAL;
185
186	if (val == 0)
187	writel(0x0, pwm->mmio_base + EP93XX_PWMx_INVERT);
188	else if (val == 1)
189	writel(0x1, pwm->mmio_base + EP93XX_PWMx_INVERT);
190	else
191	return -EINVAL;
192
193	return count;
194	}
195
196	static DEVICE_ATTR(min_freq, S_IRUGO, ep93xx_pwm_get_min_freq, NULL);
197	static DEVICE_ATTR(max_freq, S_IRUGO, ep93xx_pwm_get_max_freq, NULL);
198	static DEVICE_ATTR(freq, S_IWUSR \| S_IRUGO,
199	ep93xx_pwm_get_freq, ep93xx_pwm_set_freq);
200	static DEVICE_ATTR(duty_percent, S_IWUSR \| S_IRUGO,
201	ep93xx_pwm_get_duty_percent, ep93xx_pwm_set_duty_percent);
202	static DEVICE_ATTR(invert, S_IWUSR \| S_IRUGO,
203	ep93xx_pwm_get_invert, ep93xx_pwm_set_invert);
204
205	static struct attribute *ep93xx_pwm_attrs[] = {
206	&dev_attr_min_freq.attr,
207	&dev_attr_max_freq.attr,
208	&dev_attr_freq.attr,
209	&dev_attr_duty_percent.attr,
210	&dev_attr_invert.attr,
211	NULL
212	};
213
214	static const struct attribute_group ep93xx_pwm_sysfs_files = {
215	.attrs = ep93xx_pwm_attrs,
216	};
217
218	static int ep93xx_pwm_probe(struct platform_device *pdev)
219	{
220	struct ep93xx_pwm *pwm;
221	struct resource *res;
222	int ret;
223
224	pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
225	if (!pwm)
226	return -ENOMEM;
227
228	pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
229	if (IS_ERR(pwm->clk))
230	return PTR_ERR(pwm->clk);
231
232	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
233	pwm->mmio_base = devm_ioremap_resource(&pdev->dev, res);
234	if (IS_ERR(pwm->mmio_base))
235	return PTR_ERR(pwm->mmio_base);
236
237	ret = ep93xx_pwm_acquire_gpio(pdev);
238	if (ret)
239	return ret;
240
241	ret = sysfs_create_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
242	if (ret) {
243	ep93xx_pwm_release_gpio(pdev);
244	return ret;
245	}
246
247	pwm->duty_percent = 50;
248
249	/* disable pwm at startup. Avoids zero value. */
250	writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
251	writel(EP93XX_PWM_MAX_COUNT, pwm->mmio_base + EP93XX_PWMx_TERM_COUNT);
252	writel(EP93XX_PWM_MAX_COUNT/2, pwm->mmio_base + EP93XX_PWMx_DUTY_CYCLE);
253
254	clk_enable(pwm->clk);
255
256	platform_set_drvdata(pdev, pwm);
257	return 0;
258	}
259
260	static int ep93xx_pwm_remove(struct platform_device *pdev)
261	{
262	struct ep93xx_pwm *pwm = platform_get_drvdata(pdev);
263
264	writel(0x0, pwm->mmio_base + EP93XX_PWMx_ENABLE);
265	clk_disable(pwm->clk);
266	sysfs_remove_group(&pdev->dev.kobj, &ep93xx_pwm_sysfs_files);
267	ep93xx_pwm_release_gpio(pdev);
268
269	return 0;
270	}
271
272	static struct platform_driver ep93xx_pwm_driver = {
273	.driver = {
274	.name = "ep93xx-pwm",
275	.owner = THIS_MODULE,
276	},
277	.probe = ep93xx_pwm_probe,
278	.remove = ep93xx_pwm_remove,
279	};
280	module_platform_driver(ep93xx_pwm_driver);
281
282	MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
283	"H Hartley Sweeten <hsweeten@visionengravers.com>");
284	MODULE_DESCRIPTION("EP93xx PWM driver");
285	MODULE_LICENSE("GPL");
286	MODULE_ALIAS("platform:ep93xx-pwm");
287		1	/*

drivers/pwm/Kconfig

Diff comments View file @ a230869

 menuconfig PWM
 	bool "Pulse-Width Modulation (PWM) Support"
 	help
 	  Generic Pulse-Width Modulation (PWM) support.
 	  In Pulse-Width Modulation, a variation of the width of pulses
 	  in a rectangular pulse signal is used as a means to alter the
 	  average power of the signal. Applications include efficient
 	  power delivery and voltage regulation. In computer systems,
 	  PWMs are commonly used to control fans or the brightness of
 	  display backlights.
 	  This framework provides a generic interface to PWM devices
 	  within the Linux kernel. On the driver side it provides an API
 	  to register and unregister a PWM chip, an abstraction of a PWM
 	  controller, that supports one or more PWM devices. Client
 	  drivers can request PWM devices and use the generic framework
 	  to configure as well as enable and disable them.
 	  This generic framework replaces the legacy PWM framework which
 	  allows only a single driver implementing the required API. Not
 	  all legacy implementations have been ported to the framework
 	  yet. The framework provides an API that is backward compatible
 	  with the legacy framework so that existing client drivers
 	  continue to work as expected.
 	  If unsure, say no.
 if PWM
 config PWM_SYSFS
 	bool
 	default y if SYSFS
 config PWM_AB8500
 	tristate "AB8500 PWM support"
 	depends on AB8500_CORE && ARCH_U8500
 	help
 	  Generic PWM framework driver for Analog Baseband AB8500.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-ab8500.
 config PWM_ATMEL_TCB
 	tristate "Atmel TC Block PWM support"
 	depends on ATMEL_TCLIB && OF
 	help
 	  Generic PWM framework driver for Atmel Timer Counter Block.
 	  A Timer Counter Block provides 6 PWM devices grouped by 2.
 	  Devices in a given group must have the same period.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-atmel-tcb.
 config PWM_BFIN
 	tristate "Blackfin PWM support"
 	depends on BFIN_GPTIMERS
 	help
 	  Generic PWM framework driver for Blackfin.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-bfin.
+config PWM_EP93XX
+	tristate "Cirrus Logic EP93xx PWM support"
+	depends on ARCH_EP93XX
+	help
+	  Generic PWM framework driver for Cirrus Logic EP93xx.
+	  To compile this driver as a module, choose M here: the module
+	  will be called pwm-ep93xx.
 config PWM_IMX
 	tristate "i.MX PWM support"
 	depends on ARCH_MXC
 	help
 	  Generic PWM framework driver for i.MX.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-imx.
 config PWM_JZ4740
 	tristate "Ingenic JZ4740 PWM support"
 	depends on MACH_JZ4740
 	help
 	  Generic PWM framework driver for Ingenic JZ4740 based
 	  machines.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-jz4740.
 config PWM_LPC32XX
 	tristate "LPC32XX PWM support"
 	depends on ARCH_LPC32XX
 	help
 	  Generic PWM framework driver for LPC32XX. The LPC32XX SOC has two
 	  PWM controllers.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-lpc32xx.
 config PWM_MXS
 	tristate "Freescale MXS PWM support"
 	depends on ARCH_MXS && OF
 	select STMP_DEVICE
 	help
 	  Generic PWM framework driver for Freescale MXS.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-mxs.
 config PWM_PCA9685
 	tristate "NXP PCA9685 PWM driver"
 	depends on OF && REGMAP_I2C
 	help
 	  Generic PWM framework driver for NXP PCA9685 LED controller.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-pca9685.
 config PWM_PUV3
 	tristate "PKUnity NetBook-0916 PWM support"
 	depends on ARCH_PUV3
 	help
 	  Generic PWM framework driver for PKUnity NetBook-0916.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-puv3.
 config PWM_PXA
 	tristate "PXA PWM support"
 	depends on ARCH_PXA
 	help
 	  Generic PWM framework driver for PXA.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-pxa.
 config PWM_RENESAS_TPU
 	tristate "Renesas TPU PWM support"
 	depends on ARCH_SHMOBILE
 	help
 	  This driver exposes the Timer Pulse Unit (TPU) PWM controller found
 	  in Renesas chips through the PWM API.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-renesas-tpu.
 config PWM_SAMSUNG
 	tristate "Samsung PWM support"
 	depends on PLAT_SAMSUNG
 	help
 	  Generic PWM framework driver for Samsung.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-samsung.
 config PWM_SPEAR
 	tristate "STMicroelectronics SPEAr PWM support"
 	depends on PLAT_SPEAR
 	depends on OF
 	help
 	  Generic PWM framework driver for the PWM controller on ST
 	  SPEAr SoCs.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-spear.
 config PWM_TEGRA
 	tristate "NVIDIA Tegra PWM support"
 	depends on ARCH_TEGRA
 	help
 	  Generic PWM framework driver for the PWFM controller found on NVIDIA
 	  Tegra SoCs.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-tegra.
 config  PWM_TIECAP
 	tristate "ECAP PWM support"
 	depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX
 	help
 	  PWM driver support for the ECAP APWM controller found on AM33XX
 	  TI SOC
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-tiecap.
 config  PWM_TIEHRPWM
 	tristate "EHRPWM PWM support"
 	depends on SOC_AM33XX || ARCH_DAVINCI_DA8XX
 	help
 	  PWM driver support for the EHRPWM controller found on AM33XX
 	  TI SOC
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-tiehrpwm.
 config  PWM_TIPWMSS
 	bool
 	default y if SOC_AM33XX && (PWM_TIECAP || PWM_TIEHRPWM)
 	help
 	  PWM Subsystem driver support for AM33xx SOC.
 	  PWM submodules require PWM config space access from submodule
 	  drivers and require common parent driver support.
 config PWM_TWL
 	tristate "TWL4030/6030 PWM support"
 	depends on TWL4030_CORE
 	help
 	  Generic PWM framework driver for TWL4030/6030.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-twl.
 config PWM_TWL_LED
 	tristate "TWL4030/6030 PWM support for LED drivers"
 	depends on TWL4030_CORE
 	help
 	  Generic PWM framework driver for TWL4030/6030 LED terminals.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-twl-led.
 config PWM_VT8500
 	tristate "vt8500 PWM support"
 	depends on ARCH_VT8500
 	help
 	  Generic PWM framework driver for vt8500.
 	  To compile this driver as a module, choose M here: the module
 	  will be called pwm-vt8500.
 endif

drivers/pwm/Makefile

Diff comments View file @ a230869

 obj-$(CONFIG_PWM)		+= core.o
 obj-$(CONFIG_PWM_SYSFS)		+= sysfs.o
 obj-$(CONFIG_PWM_AB8500)	+= pwm-ab8500.o
 obj-$(CONFIG_PWM_ATMEL_TCB)	+= pwm-atmel-tcb.o
 obj-$(CONFIG_PWM_BFIN)		+= pwm-bfin.o
+obj-$(CONFIG_PWM_EP93XX)	+= pwm-ep93xx.o
 obj-$(CONFIG_PWM_IMX)		+= pwm-imx.o
 obj-$(CONFIG_PWM_JZ4740)	+= pwm-jz4740.o
 obj-$(CONFIG_PWM_LPC32XX)	+= pwm-lpc32xx.o
 obj-$(CONFIG_PWM_MXS)		+= pwm-mxs.o
 obj-$(CONFIG_PWM_PCA9685)	+= pwm-pca9685.o
 obj-$(CONFIG_PWM_PUV3)		+= pwm-puv3.o
 obj-$(CONFIG_PWM_PXA)		+= pwm-pxa.o
 obj-$(CONFIG_PWM_RENESAS_TPU)	+= pwm-renesas-tpu.o
 obj-$(CONFIG_PWM_SAMSUNG)	+= pwm-samsung.o
 obj-$(CONFIG_PWM_SPEAR)		+= pwm-spear.o
 obj-$(CONFIG_PWM_TEGRA)		+= pwm-tegra.o
 obj-$(CONFIG_PWM_TIECAP)	+= pwm-tiecap.o
 obj-$(CONFIG_PWM_TIEHRPWM)	+= pwm-tiehrpwm.o
 obj-$(CONFIG_PWM_TIPWMSS)	+= pwm-tipwmss.o
 obj-$(CONFIG_PWM_TWL)		+= pwm-twl.o
 obj-$(CONFIG_PWM_TWL_LED)	+= pwm-twl-led.o
 obj-$(CONFIG_PWM_VT8500)	+= pwm-vt8500.o

drivers/pwm/pwm-ep93xx.c

Diff comments View file @ a230869

File was created	1	/*
	2	* PWM framework driver for Cirrus Logic EP93xx
	3	*
	4	* Copyright (c) 2009 Matthieu Crapet <mcrapet@gmail.com>
	5	* Copyright (c) 2009, 2013 H Hartley Sweeten <hsweeten@visionengravers.com>
	6	*
	7	* EP9301/02 have only one channel:
	8	* platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
	9	*
	10	* EP9307 has only one channel:
	11	* platform device ep93xx-pwm.0 - PWMOUT
	12	*
	13	* EP9312/15 have two channels:
	14	* platform device ep93xx-pwm.0 - PWMOUT
	15	* platform device ep93xx-pwm.1 - PWMOUT1 (EGPIO14)
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License
	19	* as published by the Free Software Foundation; either version
	20	* 2 of the License, or (at your option) any later version.
	21	*
	22	* This program is distributed in the hope that it will be useful,
	23	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	24	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	25	* GNU General Public License for more details.
	26	*/
	27
	28	#include <linux/module.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/slab.h>
	31	#include <linux/clk.h>
	32	#include <linux/err.h>
	33	#include <linux/io.h>
	34	#include <linux/pwm.h>
	35
	36	#include <asm/div64.h>
	37
	38	#include <mach/platform.h> /* for ep93xx_pwm_{acquire,release}_gpio() */
	39
	40	#define EP93XX_PWMx_TERM_COUNT 0x00
	41	#define EP93XX_PWMx_DUTY_CYCLE 0x04
	42	#define EP93XX_PWMx_ENABLE 0x08
	43	#define EP93XX_PWMx_INVERT 0x0c
	44
	45	struct ep93xx_pwm {
	46	void __iomem *base;
	47	struct clk *clk;
	48	struct pwm_chip chip;
	49	};
	50
	51	static inline struct ep93xx_pwm to_ep93xx_pwm(struct pwm_chip chip)
	52	{
	53	return container_of(chip, struct ep93xx_pwm, chip);
	54	}
	55
	56	static int ep93xx_pwm_request(struct pwm_chip chip, struct pwm_device pwm)
	57	{
	58	struct platform_device *pdev = to_platform_device(chip->dev);
	59
	60	return ep93xx_pwm_acquire_gpio(pdev);
	61	}
	62
	63	static void ep93xx_pwm_free(struct pwm_chip chip, struct pwm_device pwm)
	64	{
	65	struct platform_device *pdev = to_platform_device(chip->dev);
	66
	67	ep93xx_pwm_release_gpio(pdev);
	68	}
	69
	70	static int ep93xx_pwm_config(struct pwm_chip chip, struct pwm_device pwm,
	71	int duty_ns, int period_ns)
	72	{
	73	struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
	74	void __iomem *base = ep93xx_pwm->base;
	75	unsigned long long c;
	76	unsigned long period_cycles;
	77	unsigned long duty_cycles;
	78	unsigned long term;
	79	int ret = 0;
	80
	81	/*
	82	* The clock needs to be enabled to access the PWM registers.
	83	* Configuration can be changed at any time.
	84	*/
	85	if (!test_bit(PWMF_ENABLED, &pwm->flags)) {
	86	ret = clk_enable(ep93xx_pwm->clk);
	87	if (ret)
	88	return ret;
	89	}
	90
	91	c = clk_get_rate(ep93xx_pwm->clk);
	92	c *= period_ns;
	93	do_div(c, 1000000000);
	94	period_cycles = c;
	95
	96	c = period_cycles;
	97	c *= duty_ns;
	98	do_div(c, period_ns);
	99	duty_cycles = c;
	100
	101	if (period_cycles < 0x10000 && duty_cycles < 0x10000) {
	102	term = readw(base + EP93XX_PWMx_TERM_COUNT);
	103
	104	/* Order is important if PWM is running */
	105	if (period_cycles > term) {
	106	writew(period_cycles, base + EP93XX_PWMx_TERM_COUNT);
	107	writew(duty_cycles, base + EP93XX_PWMx_DUTY_CYCLE);
	108	} else {
	109	writew(duty_cycles, base + EP93XX_PWMx_DUTY_CYCLE);
	110	writew(period_cycles, base + EP93XX_PWMx_TERM_COUNT);
	111	}
	112	} else {
	113	ret = -EINVAL;
	114	}
	115
	116	if (!test_bit(PWMF_ENABLED, &pwm->flags))
	117	clk_disable(ep93xx_pwm->clk);
	118
	119	return ret;
	120	}
	121
	122	static int ep93xx_pwm_polarity(struct pwm_chip chip, struct pwm_device pwm,
	123	enum pwm_polarity polarity)
	124	{
	125	struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
	126	int ret;
	127
	128	/*
	129	* The clock needs to be enabled to access the PWM registers.
	130	* Polarity can only be changed when the PWM is disabled.
	131	*/
	132	ret = clk_enable(ep93xx_pwm->clk);
	133	if (ret)
	134	return ret;
	135
	136	if (polarity == PWM_POLARITY_INVERSED)
	137	writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_INVERT);
	138	else
	139	writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_INVERT);
	140
	141	clk_disable(ep93xx_pwm->clk);
	142
	143	return 0;
	144	}
	145
	146	static int ep93xx_pwm_enable(struct pwm_chip chip, struct pwm_device pwm)
	147	{
	148	struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
	149	int ret;
	150
	151	ret = clk_enable(ep93xx_pwm->clk);
	152	if (ret)
	153	return ret;
	154
	155	writew(0x1, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);
	156
	157	return 0;
	158	}
	159
	160	static void ep93xx_pwm_disable(struct pwm_chip chip, struct pwm_device pwm)
	161	{
	162	struct ep93xx_pwm *ep93xx_pwm = to_ep93xx_pwm(chip);
	163
	164	writew(0x0, ep93xx_pwm->base + EP93XX_PWMx_ENABLE);
	165	clk_disable(ep93xx_pwm->clk);
	166	}
	167
	168	static const struct pwm_ops ep93xx_pwm_ops = {
	169	.request = ep93xx_pwm_request,
	170	.free = ep93xx_pwm_free,
	171	.config = ep93xx_pwm_config,
	172	.set_polarity = ep93xx_pwm_polarity,
	173	.enable = ep93xx_pwm_enable,
	174	.disable = ep93xx_pwm_disable,
	175	.owner = THIS_MODULE,
	176	};
	177
	178	static int ep93xx_pwm_probe(struct platform_device *pdev)
	179	{
	180	struct ep93xx_pwm *ep93xx_pwm;
	181	struct resource *res;
	182	int ret;
	183
	184	ep93xx_pwm = devm_kzalloc(&pdev->dev, sizeof(*ep93xx_pwm), GFP_KERNEL);
	185	if (!ep93xx_pwm)
	186	return -ENOMEM;
	187
	188	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	189	ep93xx_pwm->base = devm_ioremap_resource(&pdev->dev, res);
	190	if (IS_ERR(ep93xx_pwm->base))
	191	return PTR_ERR(ep93xx_pwm->base);
	192
	193	ep93xx_pwm->clk = devm_clk_get(&pdev->dev, "pwm_clk");
	194	if (IS_ERR(ep93xx_pwm->clk))
	195	return PTR_ERR(ep93xx_pwm->clk);
	196
	197	ep93xx_pwm->chip.dev = &pdev->dev;
	198	ep93xx_pwm->chip.ops = &ep93xx_pwm_ops;
	199	ep93xx_pwm->chip.base = -1;
	200	ep93xx_pwm->chip.npwm = 1;
	201
	202	ret = pwmchip_add(&ep93xx_pwm->chip);
	203	if (ret < 0)
	204	return ret;
	205
	206	platform_set_drvdata(pdev, ep93xx_pwm);
	207	return 0;
	208	}
	209
	210	static int ep93xx_pwm_remove(struct platform_device *pdev)
	211	{
	212	struct ep93xx_pwm *ep93xx_pwm = platform_get_drvdata(pdev);
	213
	214	return pwmchip_remove(&ep93xx_pwm->chip);
	215	}
	216
	217	static struct platform_driver ep93xx_pwm_driver = {
	218	.driver = {
	219	.name = "ep93xx-pwm",
	220	},
	221	.probe = ep93xx_pwm_probe,
	222	.remove = ep93xx_pwm_remove,
	223	};
	224	module_platform_driver(ep93xx_pwm_driver);
	225
	226	MODULE_DESCRIPTION("Cirrus Logic EP93xx PWM driver");
	227	MODULE_AUTHOR("Matthieu Crapet <mcrapet@gmail.com>, "
	228	"H Hartley Sweeten <hsweeten@visionengravers.com>");
	229	MODULE_ALIAS("platform:ep93xx-pwm");
	230	MODULE_LICENSE("GPL");
	231