mtd: spi: renesas: Extract strobe delay setting code into separate function

Move strobe delay setting code into extra function and reflect the latest
setting in datasheet (R-Car Gen3 v2.20, R-Car V3U v0.50).
i.e. STRTIM[2:0] should be set to 110 (RCar M3-W) or 111 (Other products)

This is also a preparation for new R-Car Gen4 SoC which has 4-bits STRTIM

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> # Fix for RZ/A1

diff --git a/drivers/spi/renesas_rpc_spi.c b/drivers/spi/renesas_rpc_spi.c
index cb2b8fb..07ff2d2 100644 (file)
--- a/drivers/spi/renesas_rpc_spi.c
+++ b/drivers/spi/renesas_rpc_spi.c
@@ -202,18 +202,31 @@ static void rpc_spi_flush_read_cache(struct udevice *dev)
 
 }
 
+static u32 rpc_spi_get_strobe_delay(void)
+{
+#ifndef CONFIG_RZA1
+       u32 cpu_type = rmobile_get_cpu_type();
+
+       /*
+        * NOTE: RPC_PHYCNT_STRTIM value:
+        *       0: On H3 ES1.x (not supported in mainline U-Boot)
+        *       6: On M3 ES1.x
+        *       7: On other R-Car Gen3
+        */
+       if (cpu_type == RMOBILE_CPU_TYPE_R8A7796 && rmobile_get_cpu_rev_integer() == 1)
+               return RPC_PHYCNT_STRTIM(6);
+       else
+#endif
+               return RPC_PHYCNT_STRTIM(7);
+}
+
 static int rpc_spi_claim_bus(struct udevice *dev, bool manual)
 {
        struct udevice *bus = dev->parent;
        struct rpc_spi_priv *priv = dev_get_priv(bus);
 
-       /*
-        * NOTE: The 0x260 are undocumented bits, but they must be set.
-        * NOTE: On H3 ES1.x (not supported in mainline U-Boot), the
-        *       RPC_PHYCNT_STRTIM shall be 0, while on newer parts, the
-        *       RPC_PHYCNT_STRTIM shall be 6.
-        */
-       writel(RPC_PHYCNT_CAL | RPC_PHYCNT_STRTIM(6) | 0x260,
+       /* NOTE: The 0x260 are undocumented bits, but they must be set. */
+       writel(RPC_PHYCNT_CAL | rpc_spi_get_strobe_delay() | 0x260,
               priv->regs + RPC_PHYCNT);
        writel((manual ? RPC_CMNCR_MD : 0) | RPC_CMNCR_SFDE |
                 RPC_CMNCR_MOIIO_HIZ | RPC_CMNCR_IOFV_HIZ | RPC_CMNCR_BSZ(0),
@@ -233,7 +246,7 @@ static int rpc_spi_release_bus(struct udevice *dev)
        struct rpc_spi_priv *priv = dev_get_priv(bus);
 
        /* NOTE: The 0x260 are undocumented bits, but they must be set. */
-       writel(RPC_PHYCNT_STRTIM(6) | 0x260, priv->regs + RPC_PHYCNT);
+       writel(rpc_spi_get_strobe_delay() | 0x260, priv->regs + RPC_PHYCNT);
 
        rpc_spi_flush_read_cache(dev);