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| * | | Merge branch 'next-i2c-mpc-v8' into next-i2cBen Dooks2010-03-07
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| | * | | i2c-mpc: add support for the MPC512x processors from FreescaleWolfgang Grandegger2010-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | As I2C interrupts must be enabled for the MPC512x by the setup function as well, "fsl,preserve-clocking" is handled in a slighly different way. Also, the old settings are now reported calling dev_dbg(). For the MPC512x the clock setup function of the MPC52xx can be re-used. Furthermore, the Kconfig help has been updated and corrected. Signed-off-by: Wolfgang Grandegger <wg@denx.de> Reviewed-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
| | * | | i2c-mpc: rename "setclock" initialization functions to "setup"Wolfgang Grandegger2010-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | To prepare support for the MPC512x processors from Freescale the "setclock" initialization functions have been renamed to "setup" because I2C interrupts must be enabled for the MPC512x by this function as well. Signed-off-by: Wolfgang Grandegger <wg@denx.de> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
| | * | | i2c-mpc: use __devinit[data] for initialization functions and dataWolfgang Grandegger2010-03-07
| | |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | "__devinit[data]" has not yet been used for all initialization functions and data. To avoid truncating lines, the struct "mpc_i2c_match_data" has been renamed to "mpc_i2c_data", which is even the better name. Signed-off-by: Wolfgang Grandegger <wg@denx.de> Tested-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
| * / / i2c-pnx: fix setting start/stop conditionLuotao Fu2010-03-07
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The start/stop condtions are set in different places repetedly in the i2c-pnx driver. Beside in i2c_pnx_start and i2c_pnx_stop the start/stop bit are also set during the transfer of a i2c message in the master_xmit/rcv calls. This is wrong since we can't set the start/stop condition during the transaction of a single message any way. As a matter of fact, the driver will sometimes set both the start and the stop bits at one time. This can be easily reproduced by sending a simple read request like e.g struct i2c_msg msgs[] = { { addr, 0, 1, buf }, { addr, I2C_M_RD, offset, buf } }; While processing the first message the i2c_pnx_master_xmit will set both the start_bit and the stop_bit, which will eventually confuse the slave. Fixed by remove setting start/stop condition from the transmit routines. Signed-off-by: Luotao Fu <l.fu@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
| * | i2c/imx: don't add probe function to the driver structUwe Kleine-König2010-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Having a pointer to the probe function is unnecessary when using platform_driver_probe and yields a section mismatch warning after removing the white list entry "*driver" for { .data$, .data.rel$ } -> { .init.* } mismatches in modpost. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
| * | i2c: Add support for Ux500/Nomadik I2C controllersrinidhi kasagar2010-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This adds support for ST-Ericsson's I2C block found in Ux500 and Nomadik 8815 platforms. Signed-off-by: srinidhi kasagar <srinidhi.kasagar@stericsson.com> Acked-by: Andrea Gallo <andrea.gallo@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | | mfd: Fix lpc_sch related depends/selects, fix build errorRandy Dunlap2010-03-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | LPC_SCH is selected by GPI_SCH and I2C_ISCH, even when PCI is not enabled, but LPC_SCH depends on PCI, so make GPI_SCH and I2C_ISCH also depend on PCI. Those 2 selects also need to select what LPC_SCH selects, since kconfig does not follow selects. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Denis Turischev <denis@compulab.co.il> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
* | | i2c: convert i2c-isch to platform_deviceDenis Turischev2010-03-07
|/ / | | | | | | | | | | | | | | Convert i2c-isch to platform_device for the lpc mfd core to add it at probe time. Signed-off-by: Denis Turischev <denis@compulab.co.il> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
* | bitops: rename for_each_bit() to for_each_set_bit()Akinobu Mita2010-03-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Rename for_each_bit to for_each_set_bit in the kernel source tree. To permit for_each_clear_bit(), should that ever be added. The patch includes a macro to map the old for_each_bit() onto the new for_each_set_bit(). This is a (very) temporary thing to ease the migration. [akpm@linux-foundation.org: add temporary for_each_bit()] Suggested-by: Alexey Dobriyan <adobriyan@gmail.com> Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Artem Bityutskiy <dedekind@infradead.org> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | i2c-parport-light: Add SMBus alert supportJean Delvare2010-03-02
| | | | | | | | | | | | | | | | | | | | Add support for the SMBus alert mechanism to the i2c-parport-light driver. The ADM1032 evaluation board at least is properly wired for this. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Trent Piepho <tpiepho@freescale.com>
* | i2c-parport: Add SMBus alert supportJean Delvare2010-03-02
| | | | | | | | | | | | | | | | | | Add support for the SMBus alert mechanism to the i2c-parport driver. The ADM1032 evaluation board at least is properly wired for this. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: David Brownell <dbrownell@users.sourceforge.net> Cc: Trent Piepho <tpiepho@freescale.com>
* | i2c-parport: Give powered devices some time to settleJean Delvare2010-03-02
| | | | | | | | | | | | | | | | When the i2c-parport adapter is reponsible for powering devices, it would seem reasonable to give them some time to settle before trying to access them. Signed-off-by: Jean Delvare <khali@linux-fr.org>
* | i2c-tiny-usb: Fix a comment on bus frequencyJean Delvare2010-03-02
| | | | | | | | | | | | | | | | | | | | The description of the delay parameter is incomplete, it suggests that there is a direct relation between the delay value and the bus frequency. In fact, due to additional delays in the i2c bitbanging code, the i2c clock is always much slower. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Till Harbaum <Till@Harbaum.org>
* | i2c-i801: Add Intel Cougar Point device IDsSeth Heasley2010-03-02
| | | | | | | | | | | | | | Add the Intel Cougar Point (PCH) SMBus controller device IDs. Signed-off-by: Seth Heasley <seth.heasley@intel.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* | i2c: Make PCI device ids constantMárton Németh2010-03-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The id_table field of the struct pci_driver is constant in <linux/pci.h> so it is worth to make initialization data also constant. The semantic match that finds this kind of pattern is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r@ disable decl_init,const_decl_init; identifier I1, I2, x; @@ struct I1 { ... const struct I2 *x; ... }; @s@ identifier r.I1, y; identifier r.x, E; @@ struct I1 y = { .x = E, }; @c@ identifier r.I2; identifier s.E; @@ const struct I2 E[] = ... ; @depends on !c@ identifier r.I2; identifier s.E; @@ + const struct I2 E[] = ...; // </smpl> Signed-off-by: Márton Németh <nm127@freemail.hu> Cc: Julia Lawall <julia@diku.dk> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* | Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-armLinus Torvalds2010-03-01
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (100 commits) ARM: Eliminate decompressor -Dstatic= PIC hack ARM: 5958/1: ARM: U300: fix inverted clk round rate ARM: 5956/1: misplaced parentheses ARM: 5955/1: ep93xx: move timer defines into core.c and document ARM: 5954/1: ep93xx: move gpio interrupt support to gpio.c ARM: 5953/1: ep93xx: fix broken build of clock.c ARM: 5952/1: ARM: MM: Add ARM_L1_CACHE_SHIFT_6 for handle inside each ARCH Kconfig ARM: 5949/1: NUC900 add gpio virtual memory map ARM: 5948/1: Enable timer0 to time4 clock support for nuc910 ARM: 5940/2: ARM: MMCI: remove custom DBG macro and printk ARM: make_coherent(): fix problems with highpte, part 2 MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself ARM: 5945/1: ep93xx: include correct irq.h in core.c ARM: 5933/1: amba-pl011: support hardware flow control ARM: 5930/1: Add PKMAP area description to memory.txt. ARM: 5929/1: Add checks to detect overlap of memory regions. ARM: 5928/1: Change type of VMALLOC_END to unsigned long. ARM: 5927/1: Make delimiters of DMA area globally visibly. ARM: 5926/1: Add "Virtual kernel memory..." printout. ARM: 5920/1: OMAP4: Enable L2 Cache ... Fix up trivial conflict in arch/arm/mach-mx25/clock.c
| * | ARM: PNX4008: use msecs_to_jiffies() rather than open-coding itRussell King2010-02-12
| | | | | | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: i2c-pnx makes no use of asm/uaccess.h nor asm/irq.hRussell King2010-02-12
| | | | | | | | | | | | | | | | | | Remove unnecessary includes Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: i2c-pnx: don't split messages across several linesRussell King2010-02-12
| | | | | | | | | | | | | | | | | | It makes them harder to grep for. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: Use i2c driver data for passing between internal functionsRussell King2010-02-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | Since the drivers data now contains the i2c adapter structure, we can pass around the drivers data between internal functions (which is what they want) rather than using the i2c adapter structure and having an additional pointer dereference each time. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: move i2c_adapter structure inside the drivers private dataRussell King2010-02-12
| | | | | | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: kzalloc i2c drivers internal dataRussell King2010-02-12
| | | | | | | | | | | | Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: Make ioaddr 'void __iomem *' rather than 'u32'Russell King2010-02-12
| | | | | | | | | | | | | | | | | | This avoids unnecessary casting. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: get i2c clock rate from clk APIRussell King2010-02-12
| | | | | | | | | | | | | | | Acked-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: convert i2c-pnx to use clk API enable/disable callsRussell King2010-02-12
| | | | | | | | | | | | | | | | | | | | | | | | clk_set_rate() is not supposed to be used to turn clocks on and off. That's what clk_enable/clk_disable is for. Acked-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: move i2c clock start/stop into driverRussell King2010-02-12
| | | | | | | | | | | | | | | Acked-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| * | ARM: PNX4008: move i2c suspend/resume callbacks into driverRussell King2010-02-12
| | | | | | | | | | | | | | | Acked-by: Vitaly Wool <vitalywool@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
* | | MIPS: I2C: Add driver for Cavium OCTEON I2C ports.Rade Bozic2010-02-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Signed-off-by: Rade Bozic <rade.bozic.ext@nsn.com> Signed-off-by: David Daney <ddaney@caviumnetworks.com> Cc: Michael Lawnick <michael.lawnick.ext@nsn.com> To: linux-mips@linux-mips.org To: linux-i2c@vger.kernel.org To: ben-linux@fluff.org To: khali@linux-fr.org Cc: rade.bozic.ext@nsn.com Cc: Michael Lawnick <michael.lawnick.ext@nsn.com> Patchwork: http://patchwork.linux-mips.org/patch/890/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
* | | i2c-tiny-usb: Fix on big-endian systemsJean Delvare2010-02-05
| |/ |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The functionality bit vector is always returned as a little-endian 32-bit number by the device, so it must be byte-swapped to the host endianness. On the other hand, the delay value is handled by the USB stack, so no byte swapping is needed on our side. This fixes bug #15105: http://bugzilla.kernel.org/show_bug.cgi?id=15105 Reported-by: Jens Richter <jens@richter-stutensee.de> Signed-off-by: Jean Delvare <khali@linux-fr.org> Tested-by: Jens Richter <jens@richter-stutensee.de> Cc: Till Harbaum <till@harbaum.org> Cc: stable@kernel.org
* | i2c: imx: call ioremap only after request_mem_regionUwe Kleine-König2010-01-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | accordingly adapt order of release_mem_region and release_mem_region on remove. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Wolfram Sang <w.sang@pengutronix.de> Cc: Richard Zhao <linuxzsc@gmail.com> Cc: Darius Augulis <augulis.darius@gmail.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: linux-i2c@vger.kernel.org Acked-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c: mxc: let time to generate stop bitValentin Longchamp2010-01-24
|/ | | | | | | | | | | | | | | | | | | After generating the stop bit by changing MSTA from 1 to 0, the i2c_imx->stopped was immediatly set to 1. The second test on i2c_imx->stopped then is correct and the controller never waits if the bus is busy. This patch corrects this. On mx31moboard, stop bit was not generated on single write transfers. This was kept unnoticed as other transfers are made afterwards that help the write recipient to resynchronize. Thanks to Philippe and Michael for the debugging. Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch> Signed-off by: Philippe Rétornaz <philippe.retornaz@epfl.ch> Reported-by: Michael Bonani <michael.bonani@epfl.ch> Acked-by; Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* i2c/pca: Don't use *_interruptibleWolfram Sang2010-01-16
| | | | | | | | | | | Unexpected signals can disturb the bus-handling and lock it up. Don't use interruptible in 'wait_event_*' and 'wake_*' as in commits dc1972d02747d2170fb1d78d114801f5ecb27506 (for cpm), 1ab082d7cbd0f34e39a5396cc6340c00bc5d66ef (for mpc), b7af349b175af45f9d87b3bf3f0a221e1831ed39 (for omap). Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* i2c-ali1563: Remove sparse warningsMárton Németh2010-01-16
| | | | | | | | | | | Remove the following sparse warnings (see "make C=1"): * drivers/i2c/busses/i2c-ali1563.c:91:3: warning: do-while statement is not a compound statement * drivers/i2c/busses/i2c-ali1563.c:161:3: warning: do-while statement is not a compound statement Signed-off-by: Márton Németh <nm127@freemail.hu> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* i2c: Test off by one in {piix4,vt596}_transaction()Roel Kluin2010-01-16
| | | | | | | | With `while (timeout++ < MAX_TIMEOUT)' timeout reaches MAX_TIMEOUT + 1 after the loop. This is probably unlikely to produce a problem. Signed-off-by: Roel Kluin <roel.kluin@gmail.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
* i2c-omap: OMAP3: Fix I2C lockup during timeout/error casesManjunatha GK2009-12-23
| | | | | | | | | | | | | | | | | | | | | | | | Current OMAP3 I2C driver code does not follow the correct sequence for soft reset. Due to this, lock up issues are reported during timeout/error cases. This patch fixes above issue by disabling I2C controller as per OMAP3430 TRM for soft reset. As per TRM, I2C controller needs to be disabled as a first step during soft reset. Here is correct soft reset sequence: a. Ensure that the module is disabled (clear the I2Ci.I2C_CON[15] I2C_EN bit to 0). b. Set the I2Ci.I2C_SYSC[1] SRST bit to 1. c. Enable the module by setting I2Ci.I2C_CON[15] I2C_EN bit to 1. d. Check the I2Ci.I2C_SYSS[0] RDONE bit until it is set to 1 to indicate the software reset is complete. Tested on Zoom2, Zoom3, 3430SDP and 3630SDP Signed-off-by: Manjunatha GK <manjugk@ti.com> Signed-off-by: George, Harith<harith@ti.com> Acked-by: Varadarajan, Charu Latha<charu@ti.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* i2c-omap: Don't write IE state in unidle if 0Cory Maccarrone2009-12-23
| | | | | | | | | | | | | | | | | | Commit ef871432... (i2c-omap: OMAP3: PM: (re)init for every transfer to support off-mode) introduced a change which make the dev->iestate contents be written to the OMAP_I2C_IE_REG every time omap_i2c_unidle is called. Previously, the state was only written if it wasn't equal to zero. In omap_i2c_probe, omap_i2c_unidle() is called prior to omap_i2c_init(), in which case dev->iestate has not yet been initialized and will be set to zero. Having this value written to the registers causes deadlock while booting. As such, this change restores the original functionality. Signed-off-by: Cory Maccarrone <darkstar6262@gmail.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* i2c-bfin-twi: fix CLKDIV calculationSonic Zhang2009-12-23
| | | | | | | | | | Calculation of the CLKDIV speed setting should be done using base 10 math rather than base 2. We also avoid exceeding the spec due to integer truncation and a 50% duty cycle. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* const: constify remaining dev_pm_opsAlexey Dobriyan2009-12-15
| | | | | | Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'acpica' of ↵Linus Torvalds2009-12-09
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 * 'acpica' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6: ACPICA: Update version to 20091112. ACPICA: Add additional module-level code support ACPICA: Deploy new create integer interface where appropriate ACPICA: New internal utility function to create Integer objects ACPICA: Add repair for predefined methods that must return sorted lists ACPICA: Fix possible fault if return Package objects contain NULL elements ACPICA: Add post-order callback to acpi_walk_namespace ACPICA: Change package length error message to an info message ACPICA: Reduce severity of predefined repair messages, Warning to Info ACPICA: Update version to 20091013 ACPICA: Fix possible memory leak for Scope ASL operator ACPICA: Remove possibility of executing _REG methods twice ACPICA: Add repair for bad _MAT buffers ACPICA: Add repair for bad _BIF/_BIX packages
| * ACPICA: Add post-order callback to acpi_walk_namespaceLin Ming2009-11-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The existing interface only has a pre-order callback. This change adds an additional parameter for a post-order callback which will be more useful for bus scans. ACPICA BZ 779. Also update the external calls to acpi_walk_namespace. http://www.acpica.org/bugzilla/show_bug.cgi?id=779 Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
* | i2c-pnx: Map I2C adapter number to platform ID numberKevin Wells2009-12-08
| | | | | | | | | | | | | | Map I2C adapter number to platform ID number Signed-off-by: Kevin Wells <kevin.wells@nxp.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-omap: OMAP3: PM: (re)init for every transfer to support off-modeRajendra Nayak2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Because of OMAP off-mode, powerdomain can go off when I2C is idle. Save enough state, and do a re-init for each transfer. Additional save/restore state added by Jagadeesh Bhaskar Pakaravoor (SYSC_REG) and Aaro Koskinen (wakeup sources.) Also, The OMAP3430 TRM states: "During active mode (I2Ci.I2C_CON[15] I2C_EN bit is set to 1), make no changes to the I2Ci.I2C_SCLL and I2Ci.I2C_SCLH registers. Changes may result in unpredictable behavior." Hence, the I2C_EN bit should be clearer when modifying these registers. Please note that clearing the entire I2C_CON register to disable the I2C module is safe, because the I2C_CON register is re-configured for each transfer. Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com> Signed-off-by: Rajendra Nayak <rnayak@ti.com> Cc: Jagadeesh Bhaskar Pakaravoor <j-pakaravoor@ti.com> Cc: Aaro Koskinen <aaro.koskinen@nokia.com> Cc: Jon Hunter <jon-hunter@ti.com> Cc: Hu Tao <taohu@motorola.com> Cc: Xiaolong Chen <A21785@motorola.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: i2c_dw_handle_tx_abort: Use dev_dbg() for NOACK casesShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | In the case of no-ACKs, we don't want to see dev_err() messages in the console, because some utilities like i2c-tools are capable of printing decorated console output. This patch will ease such situations. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: Cosmetic cleanupsShinya Kuribayashi2009-12-08
| | | | | | | | | | Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: Tx abort cleanupsShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | * ABRT_MASTER_DIS: Fix a typo. * i2c_dw_handle_tx_abort: Return an appropriate error number depending on abort_source. * i2c_dw_xfer: Add a missing abort_source initialization. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: Skip RX_FULL and TX_EMPTY bits on tx abort errorsShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Suppose TX_ABRT occurs in the middle of processing i2c_msg msgs[], and a STOP condition has already been generated on the bus. In this case, subsequent i2c_dw_xfer_msg() might initiate a new and unnecessary I2C transaction, which we'd have to avoid. Furthermore, anytime TX_ABRT is set, the contents of tx/rx buffers are flushed, so we don't have to process RX_FULL and TX_EMPTY. Disable interrupts, and skip them. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: i2c_dw_xfer_msg: Fix error handling proceduresShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Current error handling procedures are not good in two respects: * Forgot to mark dev->cmd_complete as "completed" on errors Once an I2C transaction is initiated, wait_for_completion_ interruptible_timeout() waits for dev->cmd_complete to be completed. We have to take care of it whenever an error is detected, otherwise we will have a needless HZ timeout. * Forgot to disable interrupts In the previous patch, interrupt mask operations have been changed. We don't disable interrupts at the end of the interrupt handler any more, and try to keep RX_FULL (and TX_EMPTY if required) enabled during the transaction so that we can send longer data than the size of Tx/Rx FIFO. If an error is detected, we need to disable interrupts before quitting current transaction. We can work around above points using dev->msg_err effectively. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: Disable TX_EMPTY when all i2c_msg msgs has been processedShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | Currently we disable TX_EMPTY interrupt when buf_len is zero, but this is wrong. (buf_len == 0) means that all transmit data in the current i2c_msg message has been sent out, but that doesn't necessarily mean all i2c_msg messages have been processed. TX_EMPTY interrupt is used as the driving force of DW I2C transactions, so we need to keep it enabled as long as i2c_msg messages are available. Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
* | i2c-designware: Process all i2c_msg messages in the interrupt handlerShinya Kuribayashi2009-12-08
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently we process the first i2c_dw_xfer_msg() in i2c_dw_xfer(), but in this case there is a possibility to be interrupted by certain interrupts. As described before in this patchset, we need to keep providing new transmit data within a given time period, otherwise Tx FIFO underrun takes place and STOP condition will be generated on the bus, even if we have more bytes to be written. In order to exclude all such possibilities, change TX_EMPTY interrupt usage as below: * DW_IC_INTR_DEFAULT_MASK: Define a default interrupt mask set, and put TX_EMPTY there. * i2c_dw_xfer_init: Enable DW_IC_INTR_DEFAULT_MASK prior to initiating a new I2C transaction. The first TX_EMPTY will be triggered shortly. With the help of it, we can make the first call to i2c_dw_xfer_msg() in the interrupt handler. * i2c_dw_xfer_msg: Fixup intr_mask operation accordingly. Make sure that TX_EMPTY operations need to be reversed. * request_irq: Set IRQF_DISABLED so that we could load transmit data into Tx FIFO without being distracted by other interrupts. * Remove i2c_dw_xfer_msg() in i2c_dw_xfer(). Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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