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path: root/drivers/i2c/busses/i2c-sirf.c
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2015-10-23i2c: sirf: tune the divider to make i2c bus freq more accurateGuoying Zhang1-4/+22
In prima2 and atlas7, due to some hardware design issue. we need to adjust the divider ratio a little according to i2c bus frequency ranges. Since i2c is open drain interface that allows the slave to stall the transaction by holding the SCL line at '0', the RTL implementation is waiting for SCL feedback from the pin after setting it to High-Z ('1'). This wait adds to the high-time interval counter few cycles of the input synchronization (depending on the SCL_FILTER_REG field), and also the time it takes for the board pull-up resistor to rise the SCL line. For slow SCL settings these additions are negligible, but they start to affect the speed when clock is set to faster frequencies. This patch is based on the actual tests, and it makes SCL more accurate. Signed-off-by: Guoying Zhang <Guoying.Zhang@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-10-20i2c: busses: drop owner assignment from platform_driversWolfram Sang1-1/+0
A platform_driver does not need to set an owner, it will be populated by the driver core. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-07-17i2c: i2c-sirf: Drop class based scanning to improve bootup timeWolfram Sang1-1/+1
This driver has been flagged to drop class based instantiation. The removal improves boot-up time and is unneeded for embedded controllers. Users have been warned to switch for some time now, so we can actually do the removal. Keep the DEPRECATED flag, so the core can inform users that the behaviour finally changed now. After another transition period, this flag can go, too. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-06-02i2c: remove unnecessary OOM messagesJingoo Han1-1/+0
The site-specific OOM messages are unnecessary, because they duplicate the MM subsystem generic OOM message. For example, k.alloc and v.alloc failures use dump_stack(). Signed-off-by: Jingoo Han <jg1.han@samsung.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Jean Delvare <jdelvare@suse.de> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Felipe Balbi <balbi@ti.com> Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2014-03-28i2c: i2c-sirf: deprecate class based instantiationWolfram Sang1-1/+1
Warn users that class based instantiation is going away soon in favour of more robust probing and faster bootup times. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: Barry Song <baohua@kernel.org>
2013-08-28i2c: sirf: retry 3 times as sometimes we get random noack and timeoutZhiwu Song1-1/+2
let i2c core retry 3 times as sometimes we get random noack and timeout even when we access an existing i2c client. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: support reverse direction of addressZhiwu Song1-0/+4
if users set I2C_M_REV_DIR_ADDR, revert the direction of address. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Rongjun Ying <rongjun.ying@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: fix the typo for setting bitrate to less than 100kZhiwu Song1-1/+1
there is a typo before, it makes the final bitrate wrong, this patch fixes it. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: we need to wait I2C_RESET status in resumeZhiwu Song1-0/+2
this fixes the issue that we lost to wait the i2c reset finished. Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-28i2c: sirf: reset i2c controller early after we get a noackZhiwu Song1-9/+18
Due to hardware ANOMALY, we need to reset I2C earlier after we get NOACK while accessing non-existing clients, otherwise we will get errors even we access existing clients later Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-08-23i2c: move OF helpers into the coreWolfram Sang1-3/+0
I2C of helpers used to live in of_i2c.c but experience (from SPI) shows that it is much cleaner to have this in the core. This also removes a circular dependency between the helpers and the core, and so we can finally register child nodes in the core instead of doing this manually in each driver. So, fix the drivers and documentation, too. Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2013-05-18drivers/i2c/busses: don't check resource with devm_ioremap_resourceWolfram Sang1-6/+0
devm_ioremap_resource does sanity checks on the given resource. No need to duplicate this in the driver. Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Acked-by: Stephen Warren <swarren@nvidia.com> Acked-by: Barry Song <Baohua.Song@csr.com>
2013-01-26Merge 3.8-rc5 into driver-core-nextGreg Kroah-Hartman1-0/+4
This resolves a gpio driver merge issue pointed out in linux-next. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-25i2c: Convert to devm_ioremap_resource()Thierry Reding1-4/+3
Convert all uses of devm_request_and_ioremap() to the newly introduced devm_ioremap_resource() which provides more consistent error handling. devm_ioremap_resource() provides its own error messages so all explicit error messages can be removed from the failure code paths. Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-22i2c: sirf: register i2c_client from dt child-nodes in probe entryBarry Song1-0/+4
in probe() entry of i2c_driver, set the of node of adapter and call of_i2c_register_devices to register all i2c_client from dt child-nodes Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
2012-12-22i2c: remove __dev* attributes from subsystemBill Pemberton1-4/+4
CONFIG_HOTPLUG is going away as an option. As result the __dev* markings will be going away. Remove use of __devinit, __devexit_p, __devinitdata, __devinitconst, and __devexit. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Acked-by: Peter Korsgaard <peter.korsgaard@barco.com> (for ocores and mux-gpio) Acked-by: Havard Skinnemoen <hskinnemoen@gmail.com> (for i2c-gpio) Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> (for puf3) Acked-by: Barry Song <baohua.song@csr.com> (for sirf) Reviewed-by: Jean Delvare <khali@linux-fr.org> [wsa: Fixed "foo* bar" flaws while we are here] Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
2012-03-07i2c: add CSR SiRFprimaII on-chip I2C controllers driverZhiwu Song1-0/+459
SiRFprimaII is the latest generation application processor from CSR’s multi-function SoC product family. The SoC support codes are in arch/arm/mach-prima2 from Linux mainline 3.0. There are two I2C controllers on primaII, features include: * Two I2C controller modules are on chip * RISC I/O bus read write register * Up to 16 bytes data buffer for issuing commands and writing data at the same time * Up to 16 commands, and receiving read data 16 bytes at a time * Error INT report (ACK check) * No-ACK bus protocols (SCCB bus protocols) Signed-off-by: Zhiwu Song <Zhiwu.Song@csr.com> Signed-off-by: Xiangzhen Ye <Xiangzhen.Ye@csr.com> Signed-off-by: Yuping Luo <Yuping.Luo@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
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