sunxi: H3: Rework MBUS priority setup

So far the MBUS priority setup was done by writing "magic" values taken
from a DRAM controller register dump after a boot0 run.
By peeking at the Linux (sic!) MBUS driver [1] from the Allwinner BSP
kernel, we learned more about the actual meaning of those bits.
Add macros and refactor the setup function to make the MBUS setup much
more readable and meaningful.
The actual values used now are a transformation of the values used
before, which are assembled by the new code to result in the same register
writes. So this rework does not change any settings, also the code size
stays the same.

The respective source files in the BSP kernel had a proper GPL header,
so lifting this code and information into U-Boot is legal.

[Andre: provide a convenience macro to fit definitions on one line]

[1] https://github.com/longsleep/linux-pine64/blob/lichee-dev-v3.10.65/drivers/bus/sunxi_mbus.c

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>

1 files changed, 64 insertions, 24 deletions

diff --git a/arch/arm/mach-sunxi/dram_sun8i_h3.c b/arch/arm/mach-sunxi/dram_sun8i_h3.c
index b08b8e6..8925446 100644
--- a/arch/arm/mach-sunxi/dram_sun8i_h3.c
+++ b/arch/arm/mach-sunxi/dram_sun8i_h3.c
@@ -94,6 +94,58 @@ static void mctl_dq_delay(u32 read, u32 write)
 	udelay(1);
 }
 
+enum {
+	MBUS_PORT_CPU           = 0,
+	MBUS_PORT_GPU           = 1,
+	MBUS_PORT_UNUSED	= 2,
+	MBUS_PORT_DMA           = 3,
+	MBUS_PORT_VE            = 4,
+	MBUS_PORT_CSI           = 5,
+	MBUS_PORT_NAND          = 6,
+	MBUS_PORT_SS            = 7,
+	MBUS_PORT_TS            = 8,
+	MBUS_PORT_DI            = 9,
+	MBUS_PORT_DE            = 10,
+	MBUS_PORT_DE_CFD        = 11,
+};
+
+enum {
+	MBUS_QOS_LOWEST = 0,
+	MBUS_QOS_LOW,
+	MBUS_QOS_HIGH,
+	MBUS_QOS_HIGHEST
+};
+
+inline void mbus_configure_port(u8 port,
+				bool bwlimit,
+				bool priority,
+				u8 qos,         /* MBUS_QOS_LOWEST .. MBUS_QOS_HIGEST */
+				u8 waittime,    /* 0 .. 0xf */
+				u8 acs,         /* 0 .. 0xff */
+				u16 bwl0,       /* 0 .. 0xffff, bandwidth limit in MB/s */
+				u16 bwl1,
+				u16 bwl2)
+{
+	struct sunxi_mctl_com_reg * const mctl_com =
+			(struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
+
+	const u32 cfg0 = ( (bwlimit ? (1 << 0) : 0)
+			   | (priority ? (1 << 1) : 0)
+			   | ((qos & 0x3) << 2)
+			   | ((waittime & 0xf) << 4)
+			   | ((acs & 0xff) << 8)
+			   | (bwl0 << 16) );
+	const u32 cfg1 = ((u32)bwl2 << 16) | (bwl1 & 0xffff);
+
+	debug("MBUS port %d cfg0 %08x cfg1 %08x\n", port, cfg0, cfg1);
+	writel(cfg0, &mctl_com->mcr[port][0]);
+	writel(cfg1, &mctl_com->mcr[port][1]);
+}
+
+#define MBUS_CONF(port, bwlimit, qos, acs, bwl0, bwl1, bwl2)	\
+	mbus_configure_port(MBUS_PORT_ ## port, bwlimit, false, \
+			    MBUS_QOS_ ## qos, 0, acs, bwl0, bwl1, bwl2)
+
 static void mctl_set_master_priority(void)
 {
 	struct sunxi_mctl_com_reg * const mctl_com =
@@ -105,30 +157,18 @@ static void mctl_set_master_priority(void)
 	/* set cpu high priority */
 	writel(0x00000001, &mctl_com->mapr);
 
-	writel(0x0200000d, &mctl_com->mcr[0][0]);
-	writel(0x00800100, &mctl_com->mcr[0][1]);
-	writel(0x06000009, &mctl_com->mcr[1][0]);
-	writel(0x01000400, &mctl_com->mcr[1][1]);
-	writel(0x0200000d, &mctl_com->mcr[2][0]);
-	writel(0x00600100, &mctl_com->mcr[2][1]);
-	writel(0x0100000d, &mctl_com->mcr[3][0]);
-	writel(0x00200080, &mctl_com->mcr[3][1]);
-	writel(0x07000009, &mctl_com->mcr[4][0]);
-	writel(0x01000640, &mctl_com->mcr[4][1]);
-	writel(0x0100000d, &mctl_com->mcr[5][0]);
-	writel(0x00200080, &mctl_com->mcr[5][1]);
-	writel(0x01000009, &mctl_com->mcr[6][0]);
-	writel(0x00400080, &mctl_com->mcr[6][1]);
-	writel(0x0100000d, &mctl_com->mcr[7][0]);
-	writel(0x00400080, &mctl_com->mcr[7][1]);
-	writel(0x0100000d, &mctl_com->mcr[8][0]);
-	writel(0x00400080, &mctl_com->mcr[8][1]);
-	writel(0x04000009, &mctl_com->mcr[9][0]);
-	writel(0x00400100, &mctl_com->mcr[9][1]);
-	writel(0x2000030d, &mctl_com->mcr[10][0]);
-	writel(0x04001800, &mctl_com->mcr[10][1]);
-	writel(0x04000009, &mctl_com->mcr[11][0]);
-	writel(0x00400120, &mctl_com->mcr[11][1]);
+	MBUS_CONF(   CPU,  true, HIGHEST, 0,  512,  256,  128);
+	MBUS_CONF(   GPU,  true,    HIGH, 0, 1536, 1024,  256);
+	MBUS_CONF(UNUSED,  true, HIGHEST, 0,  512,  256,   96);
+	MBUS_CONF(   DMA,  true, HIGHEST, 0,  256,  128,   32);
+	MBUS_CONF(    VE,  true,    HIGH, 0, 1792, 1600,  256);
+	MBUS_CONF(   CSI,  true, HIGHEST, 0,  256,  128,   32);
+	MBUS_CONF(  NAND,  true,    HIGH, 0,  256,  128,   64);
+	MBUS_CONF(    SS,  true, HIGHEST, 0,  256,  128,   64);
+	MBUS_CONF(    TS,  true, HIGHEST, 0,  256,  128,   64);
+	MBUS_CONF(    DI,  true,    HIGH, 0, 1024,  256,   64);
+	MBUS_CONF(    DE,  true, HIGHEST, 3, 8192, 6120, 1024);
+	MBUS_CONF(DE_CFD,  true,    HIGH, 0, 1024,  288,   64);
 }
 
 static void mctl_set_timing_params(struct dram_para *para)