drivers/ssb/host_soc.c

Source file repositories/reference/linux-study-clean/drivers/ssb/host_soc.c

File Facts

System
Linux kernel
Corpus path
drivers/ssb/host_soc.c
Extension
.c
Size
4577 bytes
Lines
211
Domain
Driver Families
Bucket
drivers/ssb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

while (count) {
			*buf = __raw_readb(addr);
			buf++;
			count--;
		}
		break;
	}
	case sizeof(u16): {
		__le16 *buf = buffer;

		WARN_ON(count & 1);
		while (count) {
			*buf = (__force __le16)__raw_readw(addr);
			buf++;
			count -= 2;
		}
		break;
	}
	case sizeof(u32): {
		__le32 *buf = buffer;

		WARN_ON(count & 3);
		while (count) {
			*buf = (__force __le32)__raw_readl(addr);
			buf++;
			count -= 4;
		}
		break;
	}
	default:
		WARN_ON(1);
	}
}
#endif /* CONFIG_SSB_BLOCKIO */

static void ssb_host_soc_write8(struct ssb_device *dev, u16 offset, u8 value)
{
	struct ssb_bus *bus = dev->bus;

	offset += dev->core_index * SSB_CORE_SIZE;
	writeb(value, bus->mmio + offset);
}

static void ssb_host_soc_write16(struct ssb_device *dev, u16 offset, u16 value)
{
	struct ssb_bus *bus = dev->bus;

	offset += dev->core_index * SSB_CORE_SIZE;
	writew(value, bus->mmio + offset);
}

static void ssb_host_soc_write32(struct ssb_device *dev, u16 offset, u32 value)
{
	struct ssb_bus *bus = dev->bus;

	offset += dev->core_index * SSB_CORE_SIZE;
	writel(value, bus->mmio + offset);
}

#ifdef CONFIG_SSB_BLOCKIO
static void ssb_host_soc_block_write(struct ssb_device *dev, const void *buffer,
				     size_t count, u16 offset, u8 reg_width)
{
	struct ssb_bus *bus = dev->bus;
	void __iomem *addr;

	offset += dev->core_index * SSB_CORE_SIZE;
	addr = bus->mmio + offset;

	switch (reg_width) {
	case sizeof(u8): {
		const u8 *buf = buffer;

		while (count) {
			__raw_writeb(*buf, addr);
			buf++;
			count--;
		}
		break;
	}
	case sizeof(u16): {
		const __le16 *buf = buffer;

		WARN_ON(count & 1);
		while (count) {
			__raw_writew((__force u16)(*buf), addr);
			buf++;
			count -= 2;
		}
		break;

Annotation

Implementation Notes