satip-axe/kernel/drivers/stm/fdma-xbar.c
2015-03-26 17:24:57 +01:00

101 lines
2.0 KiB
C

#include <linux/module.h>
#include <linux/platform_device.h>
#include "fdma.h"
struct fdma_xbar {
struct resource *memory;
void *base;
struct fdma_req_router router;
};
static int fdma_xbar_route(struct fdma_req_router *router, int input_req_line,
int fdma, int fdma_req_line)
{
struct fdma_xbar *xbar = container_of(router, struct fdma_xbar, router);
int output_line = (fdma * FDMA_REQ_LINES) + fdma_req_line;
writel(input_req_line, xbar->base + (output_line * 4));
return 0;
}
static int __init fdma_xbar_probe(struct platform_device *pdev)
{
struct fdma_xbar *xbar;
struct resource *memory;
unsigned long phys_base, phys_size;
xbar = kzalloc(sizeof(*xbar), GFP_KERNEL);
if (xbar == NULL)
return -ENOMEM;
memory = platform_get_resource(pdev, IORESOURCE_MEM, 0);
BUG_ON(!memory);
phys_base = memory->start;
phys_size = memory->end - memory->start + 1;
xbar->memory = request_mem_region(phys_base, phys_size,
dev_name(&pdev->dev));
if (xbar->memory == NULL) {
kfree(xbar);
return -EBUSY;
}
xbar->base = ioremap_nocache(phys_base, phys_size);
if (xbar->base == NULL) {
release_resource(xbar->memory);
kfree(xbar);
return -EBUSY;
}
xbar->router.route = fdma_xbar_route;
platform_set_drvdata(pdev, xbar);
if (fdma_register_req_router(&xbar->router) < 0) {
iounmap(xbar->base);
release_resource(xbar->memory);
kfree(xbar);
return -EINVAL;
}
return 0;
}
static int fdma_xbar_remove(struct platform_device *pdev)
{
struct fdma_xbar *xbar = platform_get_drvdata(pdev);
fdma_unregister_req_router(&xbar->router);
iounmap(xbar->base);
release_resource(xbar->memory);
kfree(xbar);
return 0;
}
static struct platform_driver fdma_xbar_driver = {
.driver.name = "stm-fdma-xbar",
.probe = fdma_xbar_probe,
.remove = fdma_xbar_remove,
};
static int __init fdma_xbar_init(void)
{
return platform_driver_register(&fdma_xbar_driver);
}
static void __exit fdma_xbar_exit(void)
{
platform_driver_unregister(&fdma_xbar_driver);
}
module_init(fdma_xbar_init)
module_exit(fdma_xbar_exit)