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lkmc_platform_device read example

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This commit is contained in:
Ciro Santilli
2017-11-11 14:11:23 +00:00
parent d8da713cf7
commit 9ec43c4e88
2 changed files with 8 additions and 4 deletions
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10
kernel_module/platform_device.c
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@@ -39,7 +39,7 @@ static void __iomem *map;
static irqreturn_t lkmc_irq_handler(int irq, void *dev)
{
/* TODO this 34 and not 18 as in the DTS, likely the interrupt controller moves it around.
* Understand precisely. 34 = 18 + 16. */
* Understand precisely. 34 = 18 + 16, I think 16 is by how much the controller will shift it. */
pr_info("lkmc_irq_handler irq = %d dev = %llx\n", irq, *(unsigned long long *)dev);
/* ACK the IRQ. */
iowrite32(0x9ABCDEF0, map + 4);
@@ -89,9 +89,13 @@ static int lkmc_platform_device_probe(struct platform_device *pdev)
dev_info(dev, "res.start = %llx resource_size = %llx\n",
(unsigned long long)res.start, (unsigned long long)resource_size(&res));
/* Test MMIO and IRQ. */
/* Test MMIO and IRQ: writing to the register generates an IRQ. */
iowrite32(0x12345678, map);
/* Test register read. */
if (ioread32(map + 0) != 0x12340000) panic("assert");
if (ioread32(map + 8) != 0x12340008) panic("assert");
return 0;
}
@@ -115,7 +119,7 @@ MODULE_DEVICE_TABLE(of, of_lkmc_platform_device_match);
static struct platform_driver lkmc_plaform_driver = {
.probe = lkmc_platform_device_probe,
.remove = lkmc_platform_device_remove,
.remove = lkmc_platform_device_remove,
.driver = {
.name = "lkmc_platform_device",
.of_match_table = of_lkmc_platform_device_match,