linux/arch/arm/plat-pxa/ssp.c
Andy Shevchenko 4f3d957718
spi: pxa2xx: No need to keep pointer to platform device
There is no need to keep a pointer to the platform device. Currently there are
no users of it directly, and if there will be in the future we may restore it
from pointer to the struct device.

Convert all users at the same time.

Cc: Russell King <linux@armlinux.org.uk>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20191018105429.82782-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-10-18 18:24:50 +01:00

232 lines
5.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/mach-pxa/ssp.c
*
* based on linux/arch/arm/mach-sa1100/ssp.c by Russell King
*
* Copyright (C) 2003 Russell King.
* Copyright (C) 2003 Wolfson Microelectronics PLC
*
* PXA2xx SSP driver. This provides the generic core for simple
* IO-based SSP applications and allows easy port setup for DMA access.
*
* Author: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/irq.h>
static DEFINE_MUTEX(ssp_lock);
static LIST_HEAD(ssp_list);
struct ssp_device *pxa_ssp_request(int port, const char *label)
{
struct ssp_device *ssp = NULL;
mutex_lock(&ssp_lock);
list_for_each_entry(ssp, &ssp_list, node) {
if (ssp->port_id == port && ssp->use_count == 0) {
ssp->use_count++;
ssp->label = label;
break;
}
}
mutex_unlock(&ssp_lock);
if (&ssp->node == &ssp_list)
return NULL;
return ssp;
}
EXPORT_SYMBOL(pxa_ssp_request);
struct ssp_device *pxa_ssp_request_of(const struct device_node *of_node,
const char *label)
{
struct ssp_device *ssp = NULL;
mutex_lock(&ssp_lock);
list_for_each_entry(ssp, &ssp_list, node) {
if (ssp->of_node == of_node && ssp->use_count == 0) {
ssp->use_count++;
ssp->label = label;
break;
}
}
mutex_unlock(&ssp_lock);
if (&ssp->node == &ssp_list)
return NULL;
return ssp;
}
EXPORT_SYMBOL(pxa_ssp_request_of);
void pxa_ssp_free(struct ssp_device *ssp)
{
mutex_lock(&ssp_lock);
if (ssp->use_count) {
ssp->use_count--;
ssp->label = NULL;
} else
dev_err(ssp->dev, "device already free\n");
mutex_unlock(&ssp_lock);
}
EXPORT_SYMBOL(pxa_ssp_free);
#ifdef CONFIG_OF
static const struct of_device_id pxa_ssp_of_ids[] = {
{ .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP },
{ .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP },
{ .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP },
{ .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP },
{ .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP },
{ .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP },
{ .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP },
{ },
};
MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
#endif
static int pxa_ssp_probe(struct platform_device *pdev)
{
struct resource *res;
struct ssp_device *ssp;
struct device *dev = &pdev->dev;
ssp = devm_kzalloc(dev, sizeof(struct ssp_device), GFP_KERNEL);
if (ssp == NULL)
return -ENOMEM;
ssp->dev = dev;
ssp->clk = devm_clk_get(dev, NULL);
if (IS_ERR(ssp->clk))
return PTR_ERR(ssp->clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "no memory resource defined\n");
return -ENODEV;
}
res = devm_request_mem_region(dev, res->start, resource_size(res),
pdev->name);
if (res == NULL) {
dev_err(dev, "failed to request memory resource\n");
return -EBUSY;
}
ssp->phys_base = res->start;
ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
if (ssp->mmio_base == NULL) {
dev_err(dev, "failed to ioremap() registers\n");
return -ENODEV;
}
ssp->irq = platform_get_irq(pdev, 0);
if (ssp->irq < 0) {
dev_err(dev, "no IRQ resource defined\n");
return -ENODEV;
}
if (dev->of_node) {
const struct of_device_id *id =
of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
ssp->type = (int) id->data;
} else {
const struct platform_device_id *id =
platform_get_device_id(pdev);
ssp->type = (int) id->driver_data;
/* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
* starts from 0, do a translation here
*/
ssp->port_id = pdev->id + 1;
}
ssp->use_count = 0;
ssp->of_node = dev->of_node;
mutex_lock(&ssp_lock);
list_add(&ssp->node, &ssp_list);
mutex_unlock(&ssp_lock);
platform_set_drvdata(pdev, ssp);
return 0;
}
static int pxa_ssp_remove(struct platform_device *pdev)
{
struct ssp_device *ssp;
ssp = platform_get_drvdata(pdev);
if (ssp == NULL)
return -ENODEV;
mutex_lock(&ssp_lock);
list_del(&ssp->node);
mutex_unlock(&ssp_lock);
return 0;
}
static const struct platform_device_id ssp_id_table[] = {
{ "pxa25x-ssp", PXA25x_SSP },
{ "pxa25x-nssp", PXA25x_NSSP },
{ "pxa27x-ssp", PXA27x_SSP },
{ "pxa3xx-ssp", PXA3xx_SSP },
{ "pxa168-ssp", PXA168_SSP },
{ "pxa910-ssp", PXA910_SSP },
{ },
};
static struct platform_driver pxa_ssp_driver = {
.probe = pxa_ssp_probe,
.remove = pxa_ssp_remove,
.driver = {
.name = "pxa2xx-ssp",
.of_match_table = of_match_ptr(pxa_ssp_of_ids),
},
.id_table = ssp_id_table,
};
static int __init pxa_ssp_init(void)
{
return platform_driver_register(&pxa_ssp_driver);
}
static void __exit pxa_ssp_exit(void)
{
platform_driver_unregister(&pxa_ssp_driver);
}
arch_initcall(pxa_ssp_init);
module_exit(pxa_ssp_exit);
MODULE_DESCRIPTION("PXA SSP driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");