linux-toradex.git/drivers/base/regmap/regmap.c, branch T30_LinuxImageV2.0Beta2_20130626

regmap: implement register striding

2012-04-15T21:58:10+00:00

regmap_config.reg_stride is introduced. All extant register addresses
are a multiple of this value. Users of serial-oriented regmap busses will
typically set this to 1. Users of the MMIO regmap bus will typically set
this based on the value size of their registers, in bytes, so 4 for a
32-bit register.

Throughout the regmap code, actual register addresses are used. Wherever
the register address is used to index some array of values, the address
is divided by the stride to determine the index, or vice-versa. Error-
checking is added to all entry-points for register address data to ensure
that register addresses actually satisfy the specified stride. The MMIO
bus ensures that the specified stride is large enough for the register
size.

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
(cherry picked from commit f01ee60fffa4dc6c77122121233a793f7f696e67)

Change-Id: I634977dcb0fe9ff95c7932e9195a2c1918eb1c18
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96510
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: allow regmap instances to be named

2012-04-15T21:47:14+00:00

Some devices have multiple separate register regions. Logically, one
regmap would be created per region. One issue that prevents this is that
each instance will attempt to create the same debugfs files. Avoid this
by allowing regmaps to be named, and use the name to construct the
debugfs directory name.

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
cherry-picked form mainline d3c242e

Change-Id: Ia3301fb4d28645f1d3593e547f9409ce20c0acfe
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96508
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: validate regmap_raw_read/write val_len

2012-04-15T21:41:12+00:00

val_len should be a multiple of val_bytes. If it's not, error out early.

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
(cherry picked from commit 851960ba7cb38a6a108d102e4c8b0ab702972e22)

Change-Id: Ic17d4bd832b5ea3e426d00ff5d0ae342b8abba45
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96507
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: introduce fast_io busses, and use a spinlock for them

2012-04-15T21:18:17+00:00

Some bus types have very fast IO. For these, acquiring a mutex for every
IO operation is a significant overhead. Allow busses to indicate their IO
is fast, and enhance regmap to use a spinlock for those busses.

[Currently limited to native endian registers -- broonie]

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
(cherry picked from commit bacdbe077342ecc9e7b3e374cc5a41995116706a)

Change-Id: I337f27a09f2b176b46e8f6d05401957a1abc0609
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96503
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: introduce explicit bus_context for bus callbacks

2012-04-15T21:12:19+00:00

The only context needed by I2C and SPI bus definitions is the device
itself; this can be converted to an i2c_client or spi_device in order
to perform IO on the device. However, other bus types may need more
context in order to perform IO. Enable this by having regmap_init accept
a bus_context parameter, and pass this to all bus callbacks. The
existing callbacks simply pass the struct device here. Future bus types
may pass something else.

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
(cherry picked from commit 0135bbcc7a0cc056f0203ff839466236b8e3dc19)

Change-Id: I36b3fb3433af6e6f1e673fc6c73ba21f7eb4d054
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96502
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Stephen Warren

regmap: Use pad_bits and reg_bits when determining register format.

2012-04-15T21:06:57+00:00

This change combines any padding bits into the register address bits when
determining register format handlers to use the next byte-divisible
register size.
A reg_shift member is introduced to the regmap struct to enable fixup
of the reg format.
Format handlers now take an extra parameter specifying the number of
bits to shift the value by.

Signed-off-by: Marc Reilly 
Signed-off-by: Mark Brown 
(cherry picked from commit d939fb9a78b4743bc4bc3cc415894ed42050c5cc)

Change-Id: I80921cfa4dd6aea5e7038927a313baeb347689e2
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96499
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: Add support for device with 24 data bits.

2012-04-15T21:01:37+00:00

Add support for devices with 24 data bits.

Signed-off-by: Marc Reilly 
Signed-off-by: Mark Brown 
(cherry picked from commit ea279fc5619e2541a0c28196b0fa06447d9ad026)

Change-Id: I69ccd494eb8622c442d55294c24ecd6acd78cfcb
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96498
Reviewed-by: Simone Willett 
Tested-by: Simone Willett

regmap: Fix future missing prototype of devres_alloc() and friends

2012-04-15T20:56:11+00:00

[Fix for breakage which will be introduced during the merge window via
header reworks in another tree, the regmap tree does include device.h
but Paul's tree breaks that.  Reworded subject to reflect -- broonie]

regmap.s uses devres_alloc() and others that are prototyped in device.h.
Include that to solve the following:

drivers/base/regmap/regmap.c: In function 'devm_regmap_init':
drivers/base/regmap/regmap.c:331:2: error: implicit declaration of function 'devres_alloc' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c:338:3: error: implicit declaration of function 'devres_add' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c:340:3: error: implicit declaration of function 'devres_free' [-Werror=implicit-function-declaration]
drivers/base/regmap/regmap.c: In function '_regmap_raw_write':
drivers/base/regmap/regmap.c:421:5: error: implicit declaration of function 'dev_err' [-Werror=implicit-function-declaration]

Signed-off-by: Stephen Warren 
Signed-off-by: Mark Brown 
(cherry picked from commit f5d6eba74b8aac7d4bf646c5445807aa6a247e6c)

Change-Id: I38c390fb5085bf3e815aa5c4048d4f89d8698563
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96495

regmap: delete unused module.h from drivers/base/regmap files

2012-04-15T20:50:37+00:00

Remove unused module.h and/or replace with export.h
as required.

Signed-off-by: Paul Gortmaker 
Signed-off-by: Mark Brown 
(cherry picked from commit 19694b5ea1d3a723dafe9544b5ee9a935414dc28)

Change-Id: Icf76b35f6d0d1f4720ca6d51fa9b2ebf123604b1
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96492
Reviewed-by: Automatic_Commit_Validation_User

regmap: Support raw reads from cached registers

2012-04-15T20:28:12+00:00

Fall back to a register by register read to do so; most likely we'll be
cache only so the overhead will be low.

Signed-off-by: Mark Brown 
(cherry picked from commit b8fb5ab156055b745254609f4635fcfd6b7dabc8)

Change-Id: I9f3b6011f4704987c5a014de8b30a2e6e3196d21
Signed-off-by: Laxman Dewangan 
Reviewed-on: http://git-master/r/96482
Reviewed-by: Simone Willett 
Tested-by: Simone Willett