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