linux/drivers/gpio/gpio-ge.c

200 lines
5.2 KiB
C
Raw Normal View History

/*
* Driver for GE FPGA based GPIO
*
* Author: Martyn Welch <martyn.welch@ge.com>
*
* 2008 (c) GE Intelligent Platforms Embedded Systems, Inc.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
/* TODO
*
* Configuration of output modes (totem-pole/open-drain)
* Interrupt configuration - interrupts are always generated the FPGA relies on
* the I/O interrupt controllers mask to stop them propergating
*/
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/gpio.h>
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 09:04:11 +01:00
#include <linux/slab.h>
#include <linux/module.h>
#define GEF_GPIO_DIRECT 0x00
#define GEF_GPIO_IN 0x04
#define GEF_GPIO_OUT 0x08
#define GEF_GPIO_TRIG 0x0C
#define GEF_GPIO_POLAR_A 0x10
#define GEF_GPIO_POLAR_B 0x14
#define GEF_GPIO_INT_STAT 0x18
#define GEF_GPIO_OVERRUN 0x1C
#define GEF_GPIO_MODE 0x20
static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
{
unsigned int data;
data = ioread32be(reg);
/* value: 0=low; 1=high */
if (value & 0x1)
data = data | (0x1 << offset);
else
data = data & ~(0x1 << offset);
iowrite32be(data, reg);
}
static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
{
unsigned int data;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
data = data | (0x1 << offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
}
static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
{
unsigned int data;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
/* Set direction before switching to input */
_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
data = data & ~(0x1 << offset);
iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
return 0;
}
static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
{
unsigned int data;
int state = 0;
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
data = ioread32be(mmchip->regs + GEF_GPIO_IN);
state = (int)((data >> offset) & 0x1);
return state;
}
static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
}
static int __init gef_gpio_init(void)
{
struct device_node *np;
int retval;
struct of_mm_gpio_chip *gef_gpio_chip;
for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
/* Allocate chip structure */
gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
if (!gef_gpio_chip) {
pr_err("%s: Unable to allocate structure\n",
np->full_name);
continue;
}
/* Setup pointers to chip functions */
2010-06-08 15:48:16 +02:00
gef_gpio_chip->gc.of_gpio_n_cells = 2;
gef_gpio_chip->gc.ngpio = 19;
gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
gef_gpio_chip->gc.get = gef_gpio_get;
gef_gpio_chip->gc.set = gef_gpio_set;
/* This function adds a memory mapped GPIO chip */
retval = of_mm_gpiochip_add(np, gef_gpio_chip);
if (retval) {
kfree(gef_gpio_chip);
pr_err("%s: Unable to add GPIO\n", np->full_name);
}
}
for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
/* Allocate chip structure */
gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
if (!gef_gpio_chip) {
pr_err("%s: Unable to allocate structure\n",
np->full_name);
continue;
}
/* Setup pointers to chip functions */
2010-06-08 15:48:16 +02:00
gef_gpio_chip->gc.of_gpio_n_cells = 2;
gef_gpio_chip->gc.ngpio = 6;
gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
gef_gpio_chip->gc.get = gef_gpio_get;
gef_gpio_chip->gc.set = gef_gpio_set;
/* This function adds a memory mapped GPIO chip */
retval = of_mm_gpiochip_add(np, gef_gpio_chip);
if (retval) {
kfree(gef_gpio_chip);
pr_err("%s: Unable to add GPIO\n", np->full_name);
}
}
for_each_compatible_node(np, NULL, "ge,imp3a-gpio") {
pr_debug("%s: Initialising GE GPIO\n", np->full_name);
/* Allocate chip structure */
gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
if (!gef_gpio_chip) {
pr_err("%s: Unable to allocate structure\n",
np->full_name);
continue;
}
/* Setup pointers to chip functions */
gef_gpio_chip->gc.of_gpio_n_cells = 2;
gef_gpio_chip->gc.ngpio = 16;
gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
gef_gpio_chip->gc.get = gef_gpio_get;
gef_gpio_chip->gc.set = gef_gpio_set;
/* This function adds a memory mapped GPIO chip */
retval = of_mm_gpiochip_add(np, gef_gpio_chip);
if (retval) {
kfree(gef_gpio_chip);
pr_err("%s: Unable to add GPIO\n", np->full_name);
}
}
return 0;
};
arch_initcall(gef_gpio_init);
MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
MODULE_LICENSE("GPL");