MIPS: Loongson: PCI: Clean up pcimap setup

Fixup the wrong original comment of pcimap, and make the source code more
understandable. and also, some new extra consideration is added in.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/mach-lemote/loongson.h

@@ -33,4 +33,21 @@ extern void __init prom_init_memory(void);
 extern void __init prom_init_cmdline(void);
 extern void __init prom_init_env(void);
 
+/* PCI Configuration Registers */
+#define LOONGSON_PCI_ISR4C  BONITO_PCI_REG(0x4c)
+
+/* PCI_Hit*_Sel_* */
+
+#define LOONGSON_PCI_HIT0_SEL_L     BONITO(BONITO_REGBASE + 0x50)
+#define LOONGSON_PCI_HIT0_SEL_H     BONITO(BONITO_REGBASE + 0x54)
+#define LOONGSON_PCI_HIT1_SEL_L     BONITO(BONITO_REGBASE + 0x58)
+#define LOONGSON_PCI_HIT1_SEL_H     BONITO(BONITO_REGBASE + 0x5c)
+#define LOONGSON_PCI_HIT2_SEL_L     BONITO(BONITO_REGBASE + 0x60)
+#define LOONGSON_PCI_HIT2_SEL_H     BONITO(BONITO_REGBASE + 0x64)
+
+/* PXArb Config & Status */
+
+#define LOONGSON_PXARB_CFG      BONITO(BONITO_REGBASE + 0x68)
+#define LOONGSON_PXARB_STATUS       BONITO(BONITO_REGBASE + 0x6c)
+
 #endif /* __ASM_MACH_LOONGSON_LOONGSON_H */

arch/mips/include/asm/mach-lemote/pci.h

@@ -24,8 +24,8 @@
 
 extern struct pci_ops bonito64_pci_ops;
 
-#define LOONGSON2E_PCI_MEM_START	0x14000000UL
-#define LOONGSON2E_PCI_MEM_END		0x1fffffffUL
+#define LOONGSON2E_PCI_MEM_START	BONITO_PCILO1_BASE
+#define LOONGSON2E_PCI_MEM_END		(BONITO_PCILO1_BASE + 0x04000000 * 2)
 #define LOONGSON2E_PCI_IO_START		0x00004000UL
 
 #endif /* !__ASM_MACH_LEMOTE_PCI_H_ */

arch/mips/lemote/lm2e/pci.c

@@ -34,33 +34,44 @@ static struct pci_controller  loongson2e_pci_controller = {
 	.io_offset      = 0x00000000UL,
 };
 
-static void __init ict_pcimap(void)
+static void __init setup_pcimap(void)
 {
 	/*
-	 * local to PCI mapping: [256M,512M] -> [256M,512M]; differ from PMON
-	 *
+	 * local to PCI mapping for CPU accessing PCI space
 	 * CPU address space [256M,448M] is window for accessing pci space
-	 * we set pcimap_lo[0,1,2] to map it to pci space [256M,448M]
-	 * pcimap: bit18,pcimap_2; bit[17-12],lo2;bit[11-6],lo1;bit[5-0],lo0
+	 * we set pcimap_lo[0,1,2] to map it to pci space[0M,64M], [320M,448M]
+	 *
+	 * pcimap: PCI_MAP2  PCI_Mem_Lo2 PCI_Mem_Lo1 PCI_Mem_Lo0
+	 * 	     [<2G]   [384M,448M] [320M,384M] [0M,64M]
 	 */
-	/* 1,00 0110 ,0001 01,00 0000 */
-	BONITO_PCIMAP = 0x46140;
-
-	/* 1, 00 0010, 0000,01, 00 0000 */
-	/* BONITO_PCIMAP = 0x42040; */
+	BONITO_PCIMAP = BONITO_PCIMAP_PCIMAP_2 |
+		BONITO_PCIMAP_WIN(2, BONITO_PCILO2_BASE) |
+		BONITO_PCIMAP_WIN(1, BONITO_PCILO1_BASE) |
+		BONITO_PCIMAP_WIN(0, 0);
 
 	/*
-	 * PCI to local mapping: [2G,2G+256M] -> [0,256M]
+	 * PCI-DMA to local mapping: [2G,2G+256M] -> [0M,256M]
 	 */
-	BONITO_PCIBASE0 = 0x80000000;
-	BONITO_PCIBASE1 = 0x00800000;
-	BONITO_PCIBASE2 = 0x90000000;
+	BONITO_PCIBASE0 = 0x80000000ul;   /* base: 2G -> mmap: 0M */
+	/* size: 256M, burst transmission, pre-fetch enable, 64bit */
+	LOONGSON_PCI_HIT0_SEL_L = 0xc000000cul;
+	LOONGSON_PCI_HIT0_SEL_H = 0xfffffffful;
+	LOONGSON_PCI_HIT1_SEL_L = 0x00000006ul; /* set this BAR as invalid */
+	LOONGSON_PCI_HIT1_SEL_H = 0x00000000ul;
+	LOONGSON_PCI_HIT2_SEL_L = 0x00000006ul; /* set this BAR as invalid */
+	LOONGSON_PCI_HIT2_SEL_H = 0x00000000ul;
+
+	/* avoid deadlock of PCI reading/writing lock operation */
+	LOONGSON_PCI_ISR4C = 0xd2000001ul;
 
+	/* can not change gnt to break pci transfer when device's gnt not
+	deassert for some broken device */
+	LOONGSON_PXARB_CFG = 0x00fe0105ul;
 }
 
 static int __init pcibios_init(void)
 {
-	ict_pcimap();
+	setup_pcimap();
 
 	loongson2e_pci_controller.io_map_base = mips_io_port_base;