2009-01-08 10:08:58 +08:00
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/*
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* Copyright 2005-2008 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Luotao Fu, kernel@pengutronix.de
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/slab.h>
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2009-01-08 10:08:58 +08:00
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#include <linux/delay.h>
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#include <linux/io.h>
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#include "../w1.h"
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#include "../w1_int.h"
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#include "../w1_log.h"
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/* According to the mx27 Datasheet the reset procedure should take up to about
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* 1350us. We set the timeout to 500*100us = 50ms for sure */
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#define MXC_W1_RESET_TIMEOUT 500
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/*
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* MXC W1 Register offsets
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*/
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#define MXC_W1_CONTROL 0x00
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#define MXC_W1_TIME_DIVIDER 0x02
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#define MXC_W1_RESET 0x04
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#define MXC_W1_COMMAND 0x06
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#define MXC_W1_TXRX 0x08
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#define MXC_W1_INTERRUPT 0x0A
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#define MXC_W1_INTERRUPT_EN 0x0C
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struct mxc_w1_device {
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void __iomem *regs;
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unsigned int clkdiv;
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struct clk *clk;
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struct w1_bus_master bus_master;
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};
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/*
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* this is the low level routine to
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* reset the device on the One Wire interface
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* on the hardware
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*/
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static u8 mxc_w1_ds2_reset_bus(void *data)
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{
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u8 reg_val;
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unsigned int timeout_cnt = 0;
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struct mxc_w1_device *dev = data;
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__raw_writeb(0x80, (dev->regs + MXC_W1_CONTROL));
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while (1) {
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reg_val = __raw_readb(dev->regs + MXC_W1_CONTROL);
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if (((reg_val >> 7) & 0x1) == 0 ||
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timeout_cnt > MXC_W1_RESET_TIMEOUT)
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break;
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else
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timeout_cnt++;
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udelay(100);
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}
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return (reg_val >> 7) & 0x1;
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}
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/*
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* this is the low level routine to read/write a bit on the One Wire
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* interface on the hardware. It does write 0 if parameter bit is set
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* to 0, otherwise a write 1/read.
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*/
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static u8 mxc_w1_ds2_touch_bit(void *data, u8 bit)
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{
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struct mxc_w1_device *mdev = data;
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void __iomem *ctrl_addr = mdev->regs + MXC_W1_CONTROL;
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unsigned int timeout_cnt = 400; /* Takes max. 120us according to
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* datasheet.
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*/
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__raw_writeb((1 << (5 - bit)), ctrl_addr);
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while (timeout_cnt--) {
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if (!((__raw_readb(ctrl_addr) >> (5 - bit)) & 0x1))
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break;
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udelay(1);
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}
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return ((__raw_readb(ctrl_addr)) >> 3) & 0x1;
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}
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2012-11-20 02:21:43 +08:00
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static int mxc_w1_probe(struct platform_device *pdev)
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2009-01-08 10:08:58 +08:00
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{
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struct mxc_w1_device *mdev;
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struct resource *res;
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int err = 0;
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drivers/w1/masters/mxc_w1.c: use devm_ functions
The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.
At the same time, this fixes two faults. First, mdev, the result of
kzalloc, was never freed. Second, on failure of ioremap, 0 was returned.
This has been replaced by -EBUSY, which was the failure value for the call
to request_mem_region, with which the call to ioremap has been combined.
The warning message on failure of ioremap is dropped, because
devm_request_and_ioremap already gives such messages on failure.
Finally, the initial call to platform_get_resource is moved closer to the
call to devm_request_and_ioremap, which takes care of checking whether its
result is NULL, implying that a test on the result of this call to
platform_get_resource is not needed.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-07 07:15:24 +08:00
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mdev = devm_kzalloc(&pdev->dev, sizeof(struct mxc_w1_device),
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GFP_KERNEL);
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2009-01-08 10:08:58 +08:00
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if (!mdev)
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return -ENOMEM;
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drivers/w1/masters/mxc_w1.c: use devm_ functions
The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.
At the same time, this fixes two faults. First, mdev, the result of
kzalloc, was never freed. Second, on failure of ioremap, 0 was returned.
This has been replaced by -EBUSY, which was the failure value for the call
to request_mem_region, with which the call to ioremap has been combined.
The warning message on failure of ioremap is dropped, because
devm_request_and_ioremap already gives such messages on failure.
Finally, the initial call to platform_get_resource is moved closer to the
call to devm_request_and_ioremap, which takes care of checking whether its
result is NULL, implying that a test on the result of this call to
platform_get_resource is not needed.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-07 07:15:24 +08:00
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mdev->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(mdev->clk))
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return PTR_ERR(mdev->clk);
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2009-01-08 10:08:58 +08:00
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mdev->clkdiv = (clk_get_rate(mdev->clk) / 1000000) - 1;
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drivers/w1/masters/mxc_w1.c: use devm_ functions
The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.
At the same time, this fixes two faults. First, mdev, the result of
kzalloc, was never freed. Second, on failure of ioremap, 0 was returned.
This has been replaced by -EBUSY, which was the failure value for the call
to request_mem_region, with which the call to ioremap has been combined.
The warning message on failure of ioremap is dropped, because
devm_request_and_ioremap already gives such messages on failure.
Finally, the initial call to platform_get_resource is moved closer to the
call to devm_request_and_ioremap, which takes care of checking whether its
result is NULL, implying that a test on the result of this call to
platform_get_resource is not needed.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-07 07:15:24 +08:00
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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2013-03-12 07:18:15 +08:00
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mdev->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(mdev->regs))
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return PTR_ERR(mdev->regs);
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2009-01-08 10:08:58 +08:00
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2012-03-08 03:59:36 +08:00
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clk_prepare_enable(mdev->clk);
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2009-01-08 10:08:58 +08:00
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__raw_writeb(mdev->clkdiv, mdev->regs + MXC_W1_TIME_DIVIDER);
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mdev->bus_master.data = mdev;
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mdev->bus_master.reset_bus = mxc_w1_ds2_reset_bus;
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mdev->bus_master.touch_bit = mxc_w1_ds2_touch_bit;
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err = w1_add_master_device(&mdev->bus_master);
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if (err)
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drivers/w1/masters/mxc_w1.c: use devm_ functions
The various devm_ functions allocate memory that is released when a driver
detaches. This patch uses these functions for data that is allocated in
the probe function of a platform device and is only freed in the remove
function.
At the same time, this fixes two faults. First, mdev, the result of
kzalloc, was never freed. Second, on failure of ioremap, 0 was returned.
This has been replaced by -EBUSY, which was the failure value for the call
to request_mem_region, with which the call to ioremap has been combined.
The warning message on failure of ioremap is dropped, because
devm_request_and_ioremap already gives such messages on failure.
Finally, the initial call to platform_get_resource is moved closer to the
call to devm_request_and_ioremap, which takes care of checking whether its
result is NULL, implying that a test on the result of this call to
platform_get_resource is not needed.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-12-07 07:15:24 +08:00
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return err;
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2009-01-08 10:08:58 +08:00
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platform_set_drvdata(pdev, mdev);
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return 0;
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}
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/*
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* disassociate the w1 device from the driver
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*/
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2012-11-20 02:26:23 +08:00
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static int mxc_w1_remove(struct platform_device *pdev)
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2009-01-08 10:08:58 +08:00
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{
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struct mxc_w1_device *mdev = platform_get_drvdata(pdev);
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w1_remove_master_device(&mdev->bus_master);
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2012-03-08 03:59:36 +08:00
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clk_disable_unprepare(mdev->clk);
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2009-01-08 10:08:58 +08:00
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return 0;
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}
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2013-01-29 23:46:10 +08:00
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static struct of_device_id mxc_w1_dt_ids[] = {
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{ .compatible = "fsl,imx21-owire" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mxc_w1_dt_ids);
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2009-01-08 10:08:58 +08:00
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static struct platform_driver mxc_w1_driver = {
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.driver = {
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2013-01-29 23:46:10 +08:00
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.name = "mxc_w1",
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.of_match_table = mxc_w1_dt_ids,
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2009-01-08 10:08:58 +08:00
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},
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.probe = mxc_w1_probe,
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2012-12-22 04:55:26 +08:00
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.remove = mxc_w1_remove,
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2009-01-08 10:08:58 +08:00
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};
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2012-11-19 20:19:48 +08:00
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module_platform_driver(mxc_w1_driver);
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2009-01-08 10:08:58 +08:00
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Freescale Semiconductors Inc");
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MODULE_DESCRIPTION("Driver for One-Wire on MXC");
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