[PATCH v4 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 as one of the
property from device tree indicating that L1 cache is present
on the cpu core.

=> cpu detail
  0: cpu@0      rv64imac
        ID = 0, freq = 999.100 MHz: L1 cache
  1: cpu@1      rv64imafdc
        ID = 1, freq = 999.100 MHz: L1 cache, MMU
  2: cpu@2      rv64imafdc
        ID = 2, freq = 999.100 MHz: L1 cache, MMU
  3: cpu@3      rv64imafdc
        ID = 3, freq = 999.100 MHz: L1 cache, MMU
  4: cpu@4      rv64imafdc
        ID = 4, freq = 999.100 MHz: L1 cache, MMU

Signed-off-by: Sagar Shrikant Kadam <sagar.ka...@sifive.com>
Reviewed-by: Pragnesh Patel <pragnesh.pa...@sifive.com>
---
 drivers/cpu/riscv_cpu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpu/riscv_cpu.c b/drivers/cpu/riscv_cpu.c
index 8c4b5e7..ce722cb 100644
--- a/drivers/cpu/riscv_cpu.c
+++ b/drivers/cpu/riscv_cpu.c
@@ -35,6 +35,7 @@ static int riscv_cpu_get_info(struct udevice *dev, struct 
cpu_info *info)
        int ret;
        struct clk clk;
        const char *mmu;
+       u32 split_cache_size;
 
        /* Zero out the frequency, in case sizeof(ulong) != sizeof(u32) */
        info->cpu_freq = 0;
@@ -57,6 +58,11 @@ static int riscv_cpu_get_info(struct udevice *dev, struct 
cpu_info *info)
        if (mmu)
                info->features |= BIT(CPU_FEAT_MMU);
 
+       /* check if I/D cache is present  */
+       ret = dev_read_u32(dev, "i-cache-size", &split_cache_size);
+       if (!ret)
+               info->features |= BIT(CPU_FEAT_L1_CACHE);
+
        return 0;
 }
 
-- 
2.7.4