[PATCH v6 4/4] riscv: cpu: check and append L1 cache to cpu features

[Sagar Shrikant Kadam]

All cpu cores within FU540-C000 having split I/D caches.
Set the L1 cache feature bit using the i-cache-size or d-cache-size
as one of the property from device tree indicating that L1 cache is
present on the cpu core.

=> cpu detail
  1: cpu at 1      rv64imafdc
        ID = 1, freq = 999.100 MHz: L1 cache, MMU
  2: cpu at 2      rv64imafdc
        ID = 2, freq = 999.100 MHz: L1 cache, MMU
  3: cpu at 3      rv64imafdc
        ID = 3, freq = 999.100 MHz: L1 cache, MMU
  4: cpu at 4      rv64imafdc
        ID = 4, freq = 999.100 MHz: L1 cache, MMU

Signed-off-by: Sagar Shrikant Kadam <sagar.kadam at sifive.com>
Reviewed-by: Pragnesh Patel <Pragnesh.patel at sifive.com>
Reviewed-by: Bin Meng <bin.meng at windriver.com>
---
 drivers/cpu/riscv_cpu.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/cpu/riscv_cpu.c b/drivers/cpu/riscv_cpu.c
index 112690f..100fe55 100644
--- a/drivers/cpu/riscv_cpu.c
+++ b/drivers/cpu/riscv_cpu.c
@@ -35,6 +35,8 @@ static int riscv_cpu_get_info(struct udevice *dev, struct cpu_info *info)
 	int ret;
 	struct clk clk;
 	const char *mmu;
+	u32 i_cache_size;
+	u32 d_cache_size;
 
 	/* First try getting the frequency from the assigned clock */
 	ret = clk_get_by_index(dev, 0, &clk);
@@ -52,6 +54,16 @@ static int riscv_cpu_get_info(struct udevice *dev, struct cpu_info *info)
 	if (mmu)
 		info->features |= BIT(CPU_FEAT_MMU);
 
+	/* check if I cache is present */
+	ret = dev_read_u32(dev, "i-cache-size", &i_cache_size);
+	if (ret)
+		/* if not found check if d-cache is present */
+		ret = dev_read_u32(dev, "d-cache-size", &d_cache_size);
+
+	/* if either I or D cache is present set L1 cache feature */
+	if (!ret)
+		info->features |= BIT(CPU_FEAT_L1_CACHE);
+
 	return 0;
 }
 
-- 
2.7.4