summaryrefslogtreecommitdiffstats
path: root/drivers/i2c
Commit message (Collapse)AuthorAgeFilesLines
* Merge tag 'powerpc-4.8-1' of ↵Linus Torvalds2016-07-301-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux Pull powerpc updates from Michael Ellerman: "Highlights: - PowerNV PCI hotplug support. - Lots more Power9 support. - eBPF JIT support on ppc64le. - Lots of cxl updates. - Boot code consolidation. Bug fixes: - Fix spin_unlock_wait() from Boqun Feng - Fix stack pointer corruption in __tm_recheckpoint() from Michael Neuling - Fix multiple bugs in memory_hotplug_max() from Bharata B Rao - mm: Ensure "special" zones are empty from Oliver O'Halloran - ftrace: Separate the heuristics for checking call sites from Michael Ellerman - modules: Never restore r2 for a mprofile-kernel style mcount() call from Michael Ellerman - Fix endianness when reading TCEs from Alexey Kardashevskiy - start rtasd before PCI probing from Greg Kurz - PCI: rpaphp: Fix slot registration for multiple slots under a PHB from Tyrel Datwyler - powerpc/mm: Add memory barrier in __hugepte_alloc() from Sukadev Bhattiprolu Cleanups & fixes: - Drop support for MPIC in pseries from Rashmica Gupta - Define and use PPC64_ELF_ABI_v2/v1 from Michael Ellerman - Remove unused symbols in asm-offsets.c from Rashmica Gupta - Fix SRIOV not building without EEH enabled from Russell Currey - Remove kretprobe_trampoline_holder from Thiago Jung Bauermann - Reduce log level of PCI I/O space warning from Benjamin Herrenschmidt - Add array bounds checking to crash_shutdown_handlers from Suraj Jitindar Singh - Avoid -maltivec when using clang integrated assembler from Anton Blanchard - Fix array overrun in ppc_rtas() syscall from Andrew Donnellan - Fix error return value in cmm_mem_going_offline() from Rasmus Villemoes - export cpu_to_core_id() from Mauricio Faria de Oliveira - Remove old symbols from defconfigs from Andrew Donnellan - Update obsolete comments in setup_32.c about entry conditions from Benjamin Herrenschmidt - Add comment explaining the purpose of setup_kdump_trampoline() from Benjamin Herrenschmidt - Merge the RELOCATABLE config entries for ppc32 and ppc64 from Kevin Hao - Remove RELOCATABLE_PPC32 from Kevin Hao - Fix .long's in tlb-radix.c to more meaningful from Balbir Singh Minor cleanups & fixes: - Andrew Donnellan, Anna-Maria Gleixner, Anton Blanchard, Benjamin Herrenschmidt, Bharata B Rao, Christophe Leroy, Colin Ian King, Geliang Tang, Greg Kurz, Madhavan Srinivasan, Michael Ellerman, Michael Ellerman, Stephen Rothwell, Stewart Smith. Freescale updates from Scott: - "Highlights include more 8xx optimizations, device tree updates, and MVME7100 support." PowerNV PCI hotplug from Gavin Shan: - PCI: Add pcibios_setup_bridge() - Override pcibios_setup_bridge() - Remove PCI_RESET_DELAY_US - Move pnv_pci_ioda_setup_opal_tce_kill() around - Increase PE# capacity - Allocate PE# in reverse order - Create PEs in pcibios_setup_bridge() - Setup PE for root bus - Extend PCI bridge resources - Make pnv_ioda_deconfigure_pe() visible - Dynamically release PE - Update bridge windows on PCI plug - Delay populating pdn - Support PCI slot ID - Use PCI slot reset infrastructure - Introduce pnv_pci_get_slot_id() - Functions to get/set PCI slot state - PCI/hotplug: PowerPC PowerNV PCI hotplug driver - Print correct PHB type names Power9 idle support from Shreyas B. Prabhu: - set power_save func after the idle states are initialized - Use PNV_THREAD_WINKLE macro while requesting for winkle - make hypervisor state restore a function - Rename idle_power7.S to idle_book3s.S - Rename reusable idle functions to hardware agnostic names - Make pnv_powersave_common more generic - abstraction for saving SPRs before entering deep idle states - Add platform support for stop instruction - cpuidle/powernv: Use CPUIDLE_STATE_MAX instead of MAX_POWERNV_IDLE_STATES - cpuidle/powernv: cleanup cpuidle-powernv.c - cpuidle/powernv: Add support for POWER ISA v3 idle states - Use deepest stop state when cpu is offlined Power9 PMU from Madhavan Srinivasan: - factor out power8 pmu macros and defines - factor out power8 pmu functions - factor out power8 __init_pmu code - Add power9 event list macros for generic and cache events - Power9 PMU support - Export Power9 generic and cache events to sysfs Power9 preliminary interrupt & PCI support from Benjamin Herrenschmidt: - Add XICS emulation APIs - Move a few exception common handlers to make room - Add support for HV virtualization interrupts - Add mechanism to force a replay of interrupts - Add ICP OPAL backend - Discover IODA3 PHBs - pci: Remove obsolete SW invalidate - opal: Add real mode call wrappers - Rename TCE invalidation calls - Remove SWINV constants and obsolete TCE code - Rework accessing the TCE invalidate register - Fallback to OPAL for TCE invalidations - Use the device-tree to get available range of M64's - Check status of a PHB before using it - pci: Don't try to allocate resources that will be reassigned Other Power9: - Send SIGBUS on unaligned copy and paste from Chris Smart - Large Decrementer support from Oliver O'Halloran - Load Monitor Register Support from Jack Miller Performance improvements from Anton Blanchard: - Avoid load hit store in __giveup_fpu() and __giveup_altivec() - Avoid load hit store in setup_sigcontext() - Remove assembly versions of strcpy, strcat, strlen and strcmp - Align hot loops of some string functions eBPF JIT from Naveen N. Rao: - Fix/enhance 32-bit Load Immediate implementation - Optimize 64-bit Immediate loads - Introduce rotate immediate instructions - A few cleanups - Isolate classic BPF JIT specifics into a separate header - Implement JIT compiler for extended BPF Operator Panel driver from Suraj Jitindar Singh: - devicetree/bindings: Add binding for operator panel on FSP machines - Add inline function to get rc from an ASYNC_COMP opal_msg - Add driver for operator panel on FSP machines Sparse fixes from Daniel Axtens: - make some things static - Introduce asm-prototypes.h - Include headers containing prototypes - Use #ifdef __BIG_ENDIAN__ #else for REG_BYTE - kvm: Clarify __user annotations - Pass endianness to sparse - Make ppc_md.{halt, restart} __noreturn MM fixes & cleanups from Aneesh Kumar K.V: - radix: Update LPCR HR bit as per ISA - use _raw variant of page table accessors - Compile out radix related functions if RADIX_MMU is disabled - Clear top 16 bits of va only on older cpus - Print formation regarding the the MMU mode - hash: Update SDR1 size encoding as documented in ISA 3.0 - radix: Update PID switch sequence - radix: Update machine call back to support new HCALL. - radix: Add LPID based tlb flush helpers - radix: Add a kernel command line to disable radix - Cleanup LPCR defines Boot code consolidation from Benjamin Herrenschmidt: - Move epapr_paravirt_early_init() to early_init_devtree() - cell: Don't use flat device-tree after boot - ge_imp3a: Don't use the flat device-tree after boot - mpc85xx_ds: Don't use the flat device-tree after boot - mpc85xx_rdb: Don't use the flat device-tree after boot - Don't test for machine type in rtas_initialize() - Don't test for machine type in smp_setup_cpu_maps() - dt: Add of_device_compatible_match() - Factor do_feature_fixup calls - Move 64-bit feature fixup earlier - Move 64-bit memory reserves to setup_arch() - Use a cachable DART - Move FW feature probing out of pseries probe() - Put exception configuration in a common place - Remove early allocation of the SMU command buffer - Move MMU backend selection out of platform code - pasemi: Remove IOBMAP allocation from platform probe() - mm/hash: Don't use machine_is() early during boot - Don't test for machine type to detect HEA special case - pmac: Remove spurrious machine type test - Move hash table ops to a separate structure - Ensure that ppc_md is empty before probing for machine type - Move 64-bit probe_machine() to later in the boot process - Move 32-bit probe() machine to later in the boot process - Get rid of ppc_md.init_early() - Move the boot time info banner to a separate function - Move setting of {i,d}cache_bsize to initialize_cache_info() - Move the content of setup_system() to setup_arch() - Move cache info inits to a separate function - Re-order the call to smp_setup_cpu_maps() - Re-order setup_panic() - Make a few boot functions __init - Merge 32-bit and 64-bit setup_arch() Other new features: - tty/hvc: Use IRQF_SHARED for OPAL hvc consoles from Sam Mendoza-Jonas - tty/hvc: Use opal irqchip interface if available from Sam Mendoza-Jonas - powerpc: Add module autoloading based on CPU features from Alastair D'Silva - crypto: vmx - Convert to CPU feature based module autoloading from Alastair D'Silva - Wake up kopald polling thread before waiting for events from Benjamin Herrenschmidt - xmon: Dump ISA 2.06 SPRs from Michael Ellerman - xmon: Dump ISA 2.07 SPRs from Michael Ellerman - Add a parameter to disable 1TB segs from Oliver O'Halloran - powerpc/boot: Add OPAL console to epapr wrappers from Oliver O'Halloran - Assign fixed PHB number based on device-tree properties from Guilherme G. Piccoli - pseries: Add pseries hotplug workqueue from John Allen - pseries: Add support for hotplug interrupt source from John Allen - pseries: Use kernel hotplug queue for PowerVM hotplug events from John Allen - pseries: Move property cloning into its own routine from Nathan Fontenot - pseries: Dynamic add entires to associativity lookup array from Nathan Fontenot - pseries: Auto-online hotplugged memory from Nathan Fontenot - pseries: Remove call to memblock_add() from Nathan Fontenot cxl: - Add set and get private data to context struct from Michael Neuling - make base more explicitly non-modular from Paul Gortmaker - Use for_each_compatible_node() macro from Wei Yongjun - Frederic Barrat - Abstract the differences between the PSL and XSL - Make vPHB device node match adapter's - Philippe Bergheaud - Add mechanism for delivering AFU driver specific events - Ignore CAPI adapters misplaced in switched slots - Refine slice error debug messages - Andrew Donnellan - static-ify variables to fix sparse warnings - PCI/hotplug: pnv_php: export symbols and move struct types needed by cxl - PCI/hotplug: pnv_php: handle OPAL_PCI_SLOT_OFFLINE power state - Add cxl_check_and_switch_mode() API to switch bi-modal cards - remove dead Kconfig options - fix potential NULL dereference in free_adapter() - Ian Munsie - Update process element after allocating interrupts - Add support for CAPP DMA mode - Fix allowing bogus AFU descriptors with 0 maximum processes - Fix allocating a minimum of 2 pages for the SPA - Fix bug where AFU disable operation had no effect - Workaround XSL bug that does not clear the RA bit after a reset - Fix NULL pointer dereference on kernel contexts with no AFU interrupts - powerpc/powernv: Split cxl code out into a separate file - Add cxl_slot_is_supported API - Enable bus mastering for devices using CAPP DMA mode - Move cxl_afu_get / cxl_afu_put to base - Allow a default context to be associated with an external pci_dev - Do not create vPHB if there are no AFU configuration records - powerpc/powernv: Add support for the cxl kernel api on the real phb - Add support for using the kernel API with a real PHB - Add kernel APIs to get & set the max irqs per context - Add preliminary workaround for CX4 interrupt limitation - Add support for interrupts on the Mellanox CX4 - Workaround PE=0 hardware limitation in Mellanox CX4 - powerpc/powernv: Fix pci-cxl.c build when CONFIG_MODULES=n selftests: - Test unaligned copy and paste from Chris Smart - Load Monitor Register Tests from Jack Miller - Cyril Bur - exec() with suspended transaction - Use signed long to read perf_event_paranoid - Fix usage message in context_switch - Fix generation of vector instructions/types in context_switch - Michael Ellerman - Use "Delta" rather than "Error" in normal output - Import Anton's mmap & futex micro benchmarks - Add a test for PROT_SAO" * tag 'powerpc-4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (263 commits) powerpc/mm: Parenthesise IS_ENABLED() in if condition tty/hvc: Use opal irqchip interface if available tty/hvc: Use IRQF_SHARED for OPAL hvc consoles selftests/powerpc: exec() with suspended transaction powerpc: Improve comment explaining why we modify VRSAVE powerpc/mm: Drop unused externs for hpte_init_beat[_v3]() powerpc/mm: Rename hpte_init_lpar() and move the fallback to a header powerpc/mm: Fix build break when PPC_NATIVE=n crypto: vmx - Convert to CPU feature based module autoloading powerpc: Add module autoloading based on CPU features powerpc/powernv/ioda: Fix endianness when reading TCEs powerpc/mm: Add memory barrier in __hugepte_alloc() powerpc/modules: Never restore r2 for a mprofile-kernel style mcount() call powerpc/ftrace: Separate the heuristics for checking call sites powerpc: Merge 32-bit and 64-bit setup_arch() powerpc/64: Make a few boot functions __init powerpc: Re-order setup_panic() powerpc: Re-order the call to smp_setup_cpu_maps() powerpc/32: Move cache info inits to a separate function powerpc/64: Move the content of setup_system() to setup_arch() ...
| * powerpc/opal: Add inline function to get rc from an ASYNC_COMP opal_msgSuraj Jitindar Singh2016-06-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | An opal_msg of type OPAL_MSG_ASYNC_COMP contains the return code in the params[1] struct member. However this isn't intuitive or obvious when reading the code and requires that a user look at the skiboot documentation or opal-api.h to verify this. Add an inline function to get the return code from an opal_msg and update call sites accordingly. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
* | Merge branch 'i2c/for-4.8' of ↵Linus Torvalds2016-07-2720-376/+976
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux Pull i2c updates from Wolfram Sang: "Here is the I2C pull request for 4.8: - the core and i801 driver gained support for SMBus Host Notify - core support for more than one address in DT - i2c_add_adapter() has now better error messages. We can remove all error messages from drivers calling it as a next step. - bigger updates to rk3x driver to support rk3399 SoC - the at24 eeprom driver got refactored and can now read special variants with unique serials or fixed MAC addresses. The rest is regular driver updates and bugfixes" * 'i2c/for-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (66 commits) i2c: i801: use IS_ENABLED() instead of checking for built-in or module Documentation: i2c: slave: give proper example for pm usage Documentation: i2c: slave: describe buffer problems a bit better i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clock i2c: i2c-smbus: drop useless stubs i2c: efm32: fix a failure path in efm32_i2c_probe() Revert "i2c: core: Cleanup I2C ACPI namespace" Revert "i2c: core: Add function for finding the bus speed from ACPI" i2c: Update the description of I2C_SMBUS i2c: i2c-smbus: fix i2c_handle_smbus_host_notify documentation eeprom: at24: tweak the loop_until_timeout() macro eeprom: at24: add support for at24mac series eeprom: at24: support reading the serial number for 24csxx eeprom: at24: platform_data: use BIT() macro eeprom: at24: split at24_eeprom_write() into specialized functions eeprom: at24: split at24_eeprom_read() into specialized functions eeprom: at24: hide the read/write loop behind a macro eeprom: at24: call read/write functions via function pointers eeprom: at24: coding style fixes eeprom: at24: move at24_read() below at24_eeprom_write() ...
| * | i2c: i801: use IS_ENABLED() instead of checking for built-in or moduleJavier Martinez Canillas2016-07-261-6/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The IS_ENABLED() macro checks if a Kconfig symbol has been enabled either built-in or as a module, use that macro instead of open coding the same. Using the macro makes the code more readable by helping abstract away some of the Kconfig built-in and module enable details. Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: bcm2835: Don't complain on -EPROBE_DEFER from getting our clockEric Anholt2016-07-221-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | Fixes dmesg spam when we just need to wait a moment for the clock driver to probe. Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: efm32: fix a failure path in efm32_i2c_probe()Alexey Khoroshilov2016-07-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is the only failure path in efm32_i2c_probe(), where clk_disable_unprepare() is missed. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Fixes: 1b5b23718b84 ("i2c: efm32: new bus driver") Cc: stable@kernel.org
| * | Revert "i2c: core: Cleanup I2C ACPI namespace"Wolfram Sang2016-07-191-27/+27
| | | | | | | | | | | | | | | | | | | | | | | | This reverts commit a7003b65801e17a19617a509b2dbae3442ddd709.There were too heavy merge conflicts and the driver code making use of this was not ready yet anyhow. So, we wait one cycle. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | Revert "i2c: core: Add function for finding the bus speed from ACPI"Wolfram Sang2016-07-191-59/+15
| | | | | | | | | | | | | | | | | | | | | | | | This reverts commit 55d38d060e999ca1a3ea6eb132105a0301e4cd04. There were too heavy merge conflicts and the driver code making use of this was not ready yet anyhow. So, we wait one cycle. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: Update the description of I2C_SMBUSJean Delvare2016-07-181-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | We support the SMBus Host Notify protocol now. Signed-off-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: i2c-smbus: fix i2c_handle_smbus_host_notify documentationJean Delvare2016-07-181-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | The parameter description is from a previous implementation, update it to describe the actual implementation. Signed-off-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: qup: Fixed the DMA segments lengthAbhishek Sahu2016-07-151-5/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1. The current QCOM I2C driver code is failing for transfer length greater than 255. This is happening due to improper segments length as the I2C DMA segments can be maximum of 256 bytes. 2. The transfer length tlen was being initialized with 0 for 256 bytes, which is being passed for DMA mappings resulting in improper DMA mapping length. This patch fixes the above said problems by initializing the block count with the values calculated in qup_i2c_set_blk_data and calculating the remaining length for last DMA segment. Also, the block data length need to be decremented after each transfer. Additionally, this patch corrects the tlen assignment for DMA mapping. Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: qup: Cleared the error bits in ISRAbhishek Sahu2016-07-151-6/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1. Current QCOM I2C driver hangs when sending data to address 0x03-0x07 in some scenarios. The QUP controller generates invalid write in this case, since these addresses are reserved for different bus formats. 2. Also, the error handling is done by I2C QUP ISR in the case of DMA mode. The state need to be RESET in case of any error for clearing the available data in FIFO, which otherwise leaves the BAM DMA controller in hang state. This patch fixes the above two issues by clearing the error bits from I2C and QUP status in ISR in case of I2C error, QUP error and resets the QUP state to clear the FIFO data. Signed-off-by: Abhishek Sahu <absahu@codeaurora.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: brcmstb: Remove superfluous size checkJaedon Shin2016-07-151-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The driver transfer to a message with NOACK always in any size. If client (eg. EDID segment point message) needs NOACK condition, it can use I2C_M_IGNORE_NAK flag. Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com> Acked-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: brcmstb: Make the driver buildable on BMIPS_GENERICJaedon Shin2016-07-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | The BCM7xxx ARM and MIPS based SoCs share a similar I2C hardware block. Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: core: Add function for finding the bus speed from ACPIJarkko Nikula2016-07-141-15/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ACPI 5 specification doesn't have property for the I2C bus speed but I2cSerialBus resource descriptors which define each controller-slave connection define the maximum speed supported by that connection. Thus finding the maximum safe speed for the bus is to walk all I2cSerialBus resources that are associated to I2C controller and use the speed of slowest connection. Add function i2c_acpi_find_bus_speed() to the i2c-core that adapter drivers can call prior registering itself to core. This implies two-step walk through the I2cSerialBus resources: call to i2c_acpi_find_bus_speed() does the first scan and finds the safe bus speed that adapter drivers can set up. Adapter driver registration does the second scan when i2c-core creates the I2C slaves by calling the i2c_acpi_register_devices(). In that way the bus speed is set in case slave device probe gets called during registration and does communication. Implement this by reusing the existing ACPI I2C walk routines in the i2c-core. Extend them so that slowest connection speed is saved during the walk and I2C slaves are registered only when calling through the i2c_acpi_register_devices() with the i2c_adapter pointer. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: core: Cleanup I2C ACPI namespaceJarkko Nikula2016-07-141-27/+27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I2C ACPI enumeration was originally implemented in another module under drivers/acpi/ but was later moved into i2c-core with added support for I2C ACPI operation region. Rename these acpi_i2c_ prefixed functions, structures and defines in i2c-core to i2c_acpi_ in order to have more consistent name space. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: use pr_fmt in the coreWolfram Sang2016-07-141-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | Now that we revisited all error messages, we can use pr_fmt for the remaining pr_* messages to ensure consistent output. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: print more info when acpi_i2c_space_handler() failsWolfram Sang2016-07-141-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | Use a warning loglevel instead of info and switch to dev_* for device info. Also print which client was accessed. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: print more info when of_i2c_notify failsWolfram Sang2016-07-141-2/+2
| | | | | | | | | | | | | | | | | | | | | Use dev_err instead of pr_err for more details. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: add error message when obtaining idr failsWolfram Sang2016-07-141-5/+4
| | | | | | | | | | | | | | | | | | | | | Fix some whitespace issues while here. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: improve error messages in i2c_register_adapter()Wolfram Sang2016-07-141-8/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | Switch to WARN if no adapter name is given, otherwise we won't know who missed to do that. Add error message if device registration fails. Update error message for missing algo to match style of the others. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: cleanup i2c_register_adapter() by refactoring recovery initWolfram Sang2016-07-141-34/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | | Move recovery init to a seperate function to let have i2c_register_adapter() less lines and to avoid goto and a label. Refactor string handling there for consistency and to save some bytes. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: free idr when sanity checks in i2c_register_adapter() failWolfram Sang2016-07-141-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | On error, we should give idr back to the pool in any case. Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: versatile: Convert to use resource managed devm_* APIsAxel Lin2016-07-141-33/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use devm_* APIs to simplify the code a bit. This patch also fixes the memory leak when unload the module. Signed-off-by: Axel Lin <axel.lin@ingics.com> Tested-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: versatile: Allow compile test buildAxel Lin2016-07-141-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no build dependency for this driver, so enable COMPILE_TEST to get better build coverage. Signed-off-by: Axel Lin <axel.lin@ingics.com> Tested-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: xlp9xx: add ACPI support for Broadcom VulcanTanmay Jagdale2016-07-081-2/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Added ACPI support for the I2C controller present on Broadcom's Vulcan ARM64 processor. ACPI ID used by the controller is BRCM9007. Changed the xlp9xx_i2c_get_frequency() function to use device_property_read_u32() API so that the "clock-frequency" value can be read from _DSD in ACPI mode. Signed-off-by: Tanmay Jagdale <tanmay.jagdale@broadcom.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: meson: allow build with COMPILE_TESTBen Dooks2016-07-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | This driver should be buildable with COMPILE_TEST so add this to the dependency for it. Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c-dev: don't get i2c adapter via i2c_devviresh kumar2016-07-081-6/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There is no code protecting i2c_dev to be freed after it is returned from i2c_dev_get_by_minor() and using it to access the value which we already have (minor) isn't safe really. Avoid using it and get the adapter directly from 'minor'. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Reviewed-by: Jean Delvare <jdelvare@suse.de> Tested-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware-pci: clarify a comment for MerrifieldAndy Shevchenko2016-07-061-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | There are more than 7 busses, but only 7 are user visible. Update comment accordingly. Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: i801: add support of Host NotifyBenjamin Tissoires2016-07-062-3/+86
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The i801 chip can handle the Host Notify feature since ICH 3 as mentioned in http://www.intel.com/content/dam/doc/datasheet/82801ca-io-controller-hub-3-datasheet.pdf Enable the functionality unconditionally and propagate the alert on each notification. With a T440s and a Synaptics touchpad that implements Host Notify, the payload data is always 0x0000, so I am not sure if the device actually sends the payload or if there is a problem regarding the implementation. Tested-by: Andrew Duggan <aduggan@synaptics.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: i801: recover from hardware PEC errorsEllen Wang2016-07-011-2/+51
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On a CRC error while using hardware-supported PEC, an additional error bit is set in the auxiliary status register. If this bit isn't cleared, all subsequent operations will fail, essentially hanging the controller. The fix is simple: check, report, and clear the bit in i801_check_post(). Also, in case the driver starts with the hardware in that state, clear it in i801_check_pre() as well. Signed-off-by: Ellen Wang <ellen@cumulusnetworks.com> Tested-by: Jean Delvare <jdelvare@suse.de> Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: pca-isa: Utilize the module_isa_driver macroWilliam Breathitt Gray2016-06-191-14/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This driver does not do anything special in module init/exit. This patch eliminates the module init/exit boilerplate code by utilizing the module_isa_driver macro. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> [wsa: remove two empty lines while here] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: elektor: Utilize the module_isa_driver macroWilliam Breathitt Gray2016-06-191-13/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | This driver does not do anything special in module init/exit. This patch eliminates the module init/exit boilerplate code by utilizing the module_isa_driver macro. Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware-pci: Sort header block alphabeticallyAndy Shevchenko2016-06-191-9/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Simply sort header block alphabetically. While here fix an indentation in one place and update a copyright line for Intel. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware-pci: Introduce Merrifield supportAndy Shevchenko2016-06-191-0/+39
| | | | | | | | | | | | | | | | | | | | | | | | This patch enables I2C controllers found on Intel Edison board. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware-pci: Make bus number allocation robustAndy Shevchenko2016-06-192-50/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On some platforms, such as Intel Medfield, the I2C slave devices are enumerated through SFI tables where bus numbering is expected to be defined in the OS. Make the bus number allocation robust for such platforms. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware: Allow build Baytrail semaphore support when IOSF_MBI=mJarkko Nikula2016-06-191-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I believe i2c-designware-baytrail.c doesn't have strict dependency that Intel SoC IOSF Sideband support must be always built-in in order to be able to compile support for Intel Baytrail I2C bus sharing HW semaphore. Redefine build dependencies so that CONFIG_IOSF_MBI=y is required only when CONFIG_I2C_DESIGNWARE_PLATFORM is built-in. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: David Box <david.e.box@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: designware: Use transfer timeout from ioctl I2C_TIMEOUTWeifeng Voon2016-06-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This allows applications to set the transfer timeout in 10ms increments via ioctl I2C_TIMEOUT. Signed-off-by: Weifeng Voon <weifeng.voon@intel.com> Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: qup: use address helper function in read transferNaveen Kaje2016-06-181-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | qup_i2c_issue_read() derives the address from i2c_msg. This called in the read path when I2C_M_RD flag is set. Therefore, use the 8 bit address helper function. Signed-off-by: Naveen Kaje <nkaje@codeaurora.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: qup: Fix error handlingSricharan R2016-06-181-35/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Among the bus errors reported from the QUP_MASTER_STATUS register only NACK is considered and transfer gets suspended, while other errors are ignored. Correct this and suspend the transfer for other errors as well. This avoids unnecessary 'timeouts' which happens when waiting for events that would never happen when there is already an error condition on the bus. Also the error handling procedure should be the same for both NACK and other bus errors in case of dma mode. So correct that as well. Signed-off-by: Sricharan R <sricharan@codeaurora.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: qup: Fix broken dma when CONFIG_DEBUG_SG is enabledSricharan R2016-06-181-36/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With CONFIG_DEBUG_SG is enabled and when dma mode is used, below dump is seen, ------------[ cut here ]------------ kernel BUG at include/linux/scatterlist.h:140! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.0-00459-g9f087b9-dirty #7 Hardware name: Qualcomm Technologies, Inc. APQ 8016 SBC (DT) task: ffffffc036868000 ti: ffffffc036870000 task.ti: ffffffc036870000 PC is at qup_sg_set_buf.isra.13+0x138/0x154 LR is at qup_sg_set_buf.isra.13+0x50/0x154 pc : [<ffffffc0005a0ed8>] lr : [<ffffffc0005a0df0>] pstate: 60000145 sp : ffffffc0368735c0 x29: ffffffc0368735c0 x28: ffffffc036873752 x27: ffffffc035233018 x26: ffffffc000c4e000 x25: 0000000000000000 x24: 0000000000000004 x23: 0000000000000000 x22: ffffffc035233668 x21: ffffff80004e3000 x20: ffffffc0352e0018 x19: 0000004000000000 x18: 0000000000000028 x17: 0000000000000004 x16: ffffffc0017a39c8 x15: 0000000000001cdf x14: ffffffc0019929d8 x13: ffffffc0352e0018 x12: 0000000000000000 x11: 0000000000000001 x10: 0000000000000001 x9 : ffffffc0012b2d70 x8 : ffffff80004e3000 x7 : 0000000000000018 x6 : 0000000030000000 x5 : ffffffc00199f018 x4 : ffffffc035233018 x3 : 0000000000000004 x2 : 00000000c0000000 x1 : 0000000000000003 x0 : 0000000000000000 Process swapper/0 (pid: 1, stack limit = 0xffffffc036870020) Stack: (0xffffffc0368735c0 to 0xffffffc036874000) sg_set_bug expects that the buf parameter passed in should be from lowmem and a valid pageframe. This is not true for pages from dma_alloc_coherent which can be carveouts, hence the check fails. Change allocation of sg buffers from dma_coherent memory to kzalloc to fix the issue. Note that now dma_map/unmap is used to make the kzalloc'ed buffers coherent before passing it to the dmaengine. Signed-off-by: Sricharan R <sricharan@codeaurora.org> Reviewed-by: Andy Gross <andy.gross@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: support fast-mode plus for rk3399David Wu2016-06-171-4/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement fast mode plus that allows bus speeds of up to 1MHz. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Caesar Wang <wxt@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: add i2c support for rk3399 socDavid Wu2016-06-171-20/+274
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - new method to caculate i2c timings for rk3399: There was an timing issue about "repeated start" time at the I2C controller of version0, controller appears to drop SDA at .875x (7/8) programmed clk high. On version 1 of the controller, the rule(.875x) isn't enough to meet tSU;STA requirements on 100k's Standard-mode. To resolve this issue, sda_update_config, start_setup_config and stop_setup_config for I2C timing information are added, new rules are designed to calculate the timing information at new v1. - pclk and function clk are separated at rk3399 Signed-off-by: David Wu <david.wu@rock-chips.com> Tested-by: Caesar Wang <wxt@rock-chips.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Douglas Anderson <dianders@chromium.org> [wsa: fixed whitespace issue] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: Move spec timing data to "static const" structsDavid Wu2016-06-171-28/+55
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The i2c timing specs are really just constant data. There's no reason to write code to init them, so move them out to structures. This not only is a cleaner solution but it will reduce code duplication when we introduce a new variant of rk3x_i2c_calc_divs() in a future patch. Signed-off-by: David Wu <david.wu@rock-chips.com> Suggested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: Change SoC data to not use arrayDavid Wu2016-06-171-8/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Specifying the i2c SoC data in an array provides very little benefit and gets unwieldly / confusing as the array grows since the next bit of code needs to refer to elements in the array by their raw integral index. Let's just create a single 'static const' structure for each SoC so that we can refer to these structures by ID. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Suggested-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: Remove redundant rk3x_i2c_clean_ipd()David Wu2016-06-171-1/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | rk3x_i2c_setup() gets called directly before rk3x_i2c_start(), and the last thing in setup was to clean the IPD, so no reason to do it at the beginning of start. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: use struct "rk3x_i2c_calced_timings"David Wu2016-06-171-23/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The "div_high" and "div_low" values are always used together. Group them into a structure to make it easier to pass them both around. This structure also provides a place for future calculated timings. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: rk3x: add documentation to fields in "struct rk3x_i2c"David Wu2016-06-171-1/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add kernel-doc documentation for the elements of the previously undocumented struct rk3x_i2c. Signed-off-by: David Wu <david.wu@rock-chips.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: smbus: add SMBus Host Notify supportBenjamin Tissoires2016-06-171-5/+108
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SMBus Host Notify allows a slave device to act as a master on a bus to notify the host of an interrupt. On Intel chipsets, the functionality is directly implemented in the firmware. We just need to export a function to call .alert() on the proper device driver. i2c_handle_smbus_host_notify() behaves like i2c_handle_smbus_alert(). When called, it schedules a task that will be able to sleep to go through the list of devices attached to the adapter. The current implementation allows one Host Notification to be scheduled while an other is running. Tested-by: Andrew Duggan <aduggan@synaptics.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| * | i2c: add a protocol parameter to the alert callbackBenjamin Tissoires2016-06-171-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | .alert() is meant to be generic, but there is currently no way for the device driver to know which protocol generated the alert. Add a parameter in .alert() to help the device driver to understand what is given in data. This patch is required to have the support of SMBus Host Notify protocol through .alert(). Tested-by: Andrew Duggan <aduggan@synaptics.com> For hwmon: Acked-by: Guenter Roeck <linux@roeck-us.net> For IPMI: Acked-by: Corey Minyard <cminyard@mvista.com> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
OpenPOWER on IntegriCloud