linux/drivers/ata/pata_rb532_cf.c

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/*
* A low-level PATA driver to handle a Compact Flash connected on the
* Mikrotik's RouterBoard 532 board.
*
* Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
* Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
*
* This file was based on: drivers/ata/pata_ixp4xx_cf.c
* Copyright (C) 2006-07 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* Also was based on the driver for Linux 2.4.xx published by Mikrotik for
* their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
* seems not to have a license.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
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 08:04:11 +00:00
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/libata.h>
#include <scsi/scsi_host.h>
#include <asm/gpio.h>
#define DRV_NAME "pata-rb532-cf"
#define DRV_VERSION "0.1.0"
#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash"
#define RB500_CF_MAXPORTS 1
#define RB500_CF_IO_DELAY 400
#define RB500_CF_REG_BASE 0x0800
#define RB500_CF_REG_ERR 0x080D
#define RB500_CF_REG_CTRL 0x080E
/* 32bit buffered data register offset */
#define RB500_CF_REG_DBUF32 0x0C00
struct rb532_cf_info {
void __iomem *iobase;
unsigned int gpio_line;
unsigned int irq;
};
/* ------------------------------------------------------------------------ */
static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
{
struct ata_host *ah = dev_instance;
struct rb532_cf_info *info = ah->private_data;
if (gpio_get_value(info->gpio_line)) {
set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
ata_sff_interrupt(info->irq, dev_instance);
} else {
set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
}
return IRQ_HANDLED;
}
static struct ata_port_operations rb532_pata_port_ops = {
libata: implement and use ops inheritance libata lets low level drivers build ata_port_operations table and register it with libata core layer. This allows low level drivers high level of flexibility but also burdens them with lots of boilerplate entries. This becomes worse for drivers which support related similar controllers which differ slightly. They share most of the operations except for a few. However, the driver still needs to list all operations for each variant. This results in large number of duplicate entries, which is not only inefficient but also error-prone as it becomes very difficult to tell what the actual differences are. This duplicate boilerplates all over the low level drivers also make updating the core layer exteremely difficult and error-prone. When compounded with multi-branched development model, it ends up accumulating inconsistencies over time. Some of those inconsistencies cause immediate problems and fixed. Others just remain there dormant making maintenance increasingly difficult. To rectify the problem, this patch implements ata_port_operations inheritance. To allow LLDs to easily re-use their own ops tables overriding only specific methods, this patch implements poor man's class inheritance. An ops table has ->inherits field which can be set to any ops table as long as it doesn't create a loop. When the host is started, the inheritance chain is followed and any operation which isn't specified is taken from the nearest ancestor which has it specified. This operation is called finalization and done only once per an ops table and the LLD doesn't have to do anything special about it other than making the ops table non-const such that libata can update it. libata provides four base ops tables lower drivers can inherit from - base, sata, pmp, sff and bmdma. To avoid overriding these ops accidentaly, these ops are declared const and LLDs should always inherit these instead of using them directly. After finalization, all the ops table are identical before and after the patch except for setting .irq_handler to ata_interrupt in drivers which didn't use to. The .irq_handler doesn't have any actual effect and the field will soon be removed by later patch. * sata_sx4 is still using old style EH and currently doesn't take advantage of ops inheritance. Signed-off-by: Tejun Heo <htejun@gmail.com>
2008-03-25 03:22:49 +00:00
.inherits = &ata_sff_port_ops,
.sff_data_xfer = ata_sff_data_xfer32,
};
/* ------------------------------------------------------------------------ */
static struct scsi_host_template rb532_pata_sht = {
ATA_PIO_SHT(DRV_NAME),
};
/* ------------------------------------------------------------------------ */
static void rb532_pata_setup_ports(struct ata_host *ah)
{
struct rb532_cf_info *info = ah->private_data;
struct ata_port *ap;
ap = ah->ports[0];
ap->ops = &rb532_pata_port_ops;
ap->pio_mask = ATA_PIO4;
ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE;
ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL;
ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
ata_sff_std_ports(&ap->ioaddr);
ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32;
ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR;
}
static __devinit int rb532_pata_driver_probe(struct platform_device *pdev)
{
int irq;
int gpio;
struct resource *res;
struct ata_host *ah;
struct rb532_cf_info *info;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "no IOMEM resource found\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_err(&pdev->dev, "no IRQ resource found\n");
return -ENOENT;
}
gpio = irq_to_gpio(irq);
if (gpio < 0) {
dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
return -ENOENT;
}
ret = gpio_request(gpio, DRV_NAME);
if (ret) {
dev_err(&pdev->dev, "GPIO request failed\n");
return ret;
}
/* allocate host */
ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
if (!ah)
return -ENOMEM;
platform_set_drvdata(pdev, ah);
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
ah->private_data = info;
info->gpio_line = gpio;
info->irq = irq;
info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
resource_size(res));
if (!info->iobase)
return -ENOMEM;
ret = gpio_direction_input(gpio);
if (ret) {
dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
ret);
goto err_free_gpio;
}
rb532_pata_setup_ports(ah);
ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
IRQF_TRIGGER_LOW, &rb532_pata_sht);
if (ret)
goto err_free_gpio;
return 0;
err_free_gpio:
gpio_free(gpio);
return ret;
}
static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
{
struct ata_host *ah = platform_get_drvdata(pdev);
struct rb532_cf_info *info = ah->private_data;
ata_host_detach(ah);
gpio_free(info->gpio_line);
return 0;
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:" DRV_NAME);
static struct platform_driver rb532_pata_platform_driver = {
.probe = rb532_pata_driver_probe,
.remove = __devexit_p(rb532_pata_driver_remove),
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
};
/* ------------------------------------------------------------------------ */
#define DRV_INFO DRV_DESC " version " DRV_VERSION
static int __init rb532_pata_module_init(void)
{
printk(KERN_INFO DRV_INFO "\n");
return platform_driver_register(&rb532_pata_platform_driver);
}
static void __exit rb532_pata_module_exit(void)
{
platform_driver_unregister(&rb532_pata_platform_driver);
}
MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");
module_init(rb532_pata_module_init);
module_exit(rb532_pata_module_exit);