armv8: fsl-lsch2: enable snoopable sata read and write

By default the SATA IP on the ls1043a/ls1046a SoCs does not
generating coherent/snoopable transactions.  This patch enable
it in the SCFG_SNPCNFGCR register along with sata axicc register.
In addition, the dma-coherent property must be set on the SATA
controller nodes.

Signed-off-by: Tang Yuantian <yuantian.tang@nxp.com>
[York Sun: Reformatted commit message]
Reviewed-by: York Sun <york.sun@nxp.com>

arch/arm/cpu/armv8/fsl-layerscape/soc.c

@@ -234,6 +234,7 @@ int sata_init(void)
 #endif
 	out_le32(&ccsr_ahci->ppcfg, AHCI_PORT_PHY_1_CFG);
 	out_le32(&ccsr_ahci->ptc, AHCI_PORT_TRANS_CFG);
+	out_le32(&ccsr_ahci->axicc, AHCI_PORT_AXICC_CFG);
 
 	ahci_init((void __iomem *)CONFIG_SYS_SATA);
 	scsi_scan(0);
@@ -337,7 +338,9 @@ void fsl_lsch2_early_init_f(void)
 #endif
 	/* Make SEC reads and writes snoopable */
 	setbits_be32(&scfg->snpcnfgcr, SCFG_SNPCNFGCR_SECRDSNP |
-		     SCFG_SNPCNFGCR_SECWRSNP);
+		     SCFG_SNPCNFGCR_SECWRSNP |
+		     SCFG_SNPCNFGCR_SATARDSNP |
+		     SCFG_SNPCNFGCR_SATAWRSNP);
 
 	/*
 	 * Enable snoop requests and DVM message requests for

arch/arm/include/asm/arch-fsl-layerscape/immap_lsch2.h

@@ -335,6 +335,8 @@ struct ccsr_gur {
 
 #define SCFG_SNPCNFGCR_SECRDSNP		0x80000000
 #define SCFG_SNPCNFGCR_SECWRSNP		0x40000000
+#define SCFG_SNPCNFGCR_SATARDSNP	0x00800000
+#define SCFG_SNPCNFGCR_SATAWRSNP	0x00400000
 
 /* Supplemental Configuration Unit */
 struct ccsr_scfg {

arch/arm/include/asm/arch-fsl-layerscape/soc.h

@@ -61,6 +61,7 @@ struct cpu_type {
 /* ahci port register default value */
 #define AHCI_PORT_PHY_1_CFG    0xa003fffe
 #define AHCI_PORT_TRANS_CFG    0x08000029
+#define AHCI_PORT_AXICC_CFG	0x3fffffff
 
 /* AHCI (sata) register map */
 struct ccsr_ahci {