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

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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
This commit is contained in:
Hai Pham
2021-08-16 09:26:36 +07:00
committed by Marek Vasut
parent 5f41ef792c
commit 49096f9924
1 changed files with 21 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/spi/renesas_rpc_spi.c
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@@ -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);