drivers/cache/ax45mp_cache.c

Source file repositories/reference/linux-study-clean/drivers/cache/ax45mp_cache.c

File Facts

System
Linux kernel
Corpus path
drivers/cache/ax45mp_cache.c
Extension
.c
Size
5946 bytes
Lines
218
Domain
Driver Families
Bucket
drivers/cache
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

struct ax45mp_priv {
	void __iomem *l2c_base;
	u32 ax45mp_cache_line_size;
};

static struct ax45mp_priv ax45mp_priv;

/* L2 Cache operations */
static inline uint32_t ax45mp_cpu_l2c_get_cctl_status(void)
{
	return readl(ax45mp_priv.l2c_base + AX45MP_L2C_REG_STATUS_OFFSET);
}

static void ax45mp_cpu_cache_operation(unsigned long start, unsigned long end,
				       unsigned int l1_op, unsigned int l2_op)
{
	unsigned long line_size = ax45mp_priv.ax45mp_cache_line_size;
	void __iomem *base = ax45mp_priv.l2c_base;
	int mhartid = smp_processor_id();
	unsigned long pa;

	while (end > start) {
		csr_write(AX45MP_CCTL_REG_UCCTLBEGINADDR_NUM, start);
		csr_write(AX45MP_CCTL_REG_UCCTLCOMMAND_NUM, l1_op);

		pa = virt_to_phys((void *)start);
		writel(pa, base + AX45MP_L2C_REG_CN_ACC_OFFSET(mhartid));
		writel(l2_op, base + AX45MP_L2C_REG_CN_CMD_OFFSET(mhartid));
		while ((ax45mp_cpu_l2c_get_cctl_status() &
			AX45MP_CCTL_L2_STATUS_CN_MASK(mhartid)) !=
			AX45MP_CCTL_L2_STATUS_IDLE)
			;

		start += line_size;
	}
}

/* Write-back L1 and L2 cache entry */
static inline void ax45mp_cpu_dcache_wb_range(unsigned long start, unsigned long end)
{
	ax45mp_cpu_cache_operation(start, end, AX45MP_CCTL_L1D_VA_WB,
				   AX45MP_CCTL_L2_PA_WB);
}

/* Invalidate the L1 and L2 cache entry */
static inline void ax45mp_cpu_dcache_inval_range(unsigned long start, unsigned long end)
{
	ax45mp_cpu_cache_operation(start, end, AX45MP_CCTL_L1D_VA_INVAL,
				   AX45MP_CCTL_L2_PA_INVAL);
}

static void ax45mp_dma_cache_inv(phys_addr_t paddr, size_t size)
{
	unsigned long start = (unsigned long)phys_to_virt(paddr);
	unsigned long end = start + size;
	unsigned long line_size;
	unsigned long flags;

	if (unlikely(start == end))
		return;

	line_size = ax45mp_priv.ax45mp_cache_line_size;

	start = start & (~(line_size - 1));
	end = ((end + line_size - 1) & (~(line_size - 1)));

	local_irq_save(flags);

	ax45mp_cpu_dcache_inval_range(start, end);

	local_irq_restore(flags);
}

static void ax45mp_dma_cache_wback(phys_addr_t paddr, size_t size)
{
	unsigned long start = (unsigned long)phys_to_virt(paddr);
	unsigned long end = start + size;
	unsigned long line_size;
	unsigned long flags;

	if (unlikely(start == end))
		return;

	line_size = ax45mp_priv.ax45mp_cache_line_size;
	start = start & (~(line_size - 1));
	end = ((end + line_size - 1) & (~(line_size - 1)));
	local_irq_save(flags);
	ax45mp_cpu_dcache_wb_range(start, end);
	local_irq_restore(flags);
}

Annotation

Implementation Notes