74xx_7xx: CPCI750: Add CPCI adapter/target support

The CPCI750 can be built as CPCI host or adapter/target board. This patch
adds support for runtime detection of those variants.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Reinhard Arlt <reinhard.arlt@esd-electronics.com>

board/esd/cpci750/cpci750.c

@@ -140,6 +140,15 @@ void board_prebootm_init (void);
 unsigned int INTERNAL_REG_BASE_ADDR = CONFIG_SYS_GT_REGS;
 int display_mem_map (void);
 
+/*
+ * Skip video initialization on slave variant.
+ * This function will overwrite the weak default in cfb_console.c
+ */
+int board_video_skip(void)
+{
+	return CPCI750_SLAVE_TEST;
+}
+
 /* ------------------------------------------------------------------------- */
 
 /*

board/esd/cpci750/ide.c

@@ -39,6 +39,8 @@ int ide_preinit (void)
 	int l;
 
 	status = 1;
+	if (CPCI750_SLAVE_TEST != 0)
+		return status;
 	for (l = 0; l < CONFIG_SYS_IDE_MAXBUS; l++) {
 		ide_bus_offset[l] = -ATA_STATUS;
 	}
@@ -57,7 +59,7 @@ int ide_preinit (void)
 		ide_bus_offset[1] &= 0xfffffffe;
 		ide_bus_offset[1] += CONFIG_SYS_PCI0_IO_SPACE;
 	}
-	return (status);
+	return status;
 }
 
 void ide_set_reset (int flag) {

board/esd/cpci750/pci.c

@@ -795,7 +795,6 @@ static int gt_write_config_dword (struct pci_controller *hose,
 					     PCI_DEV (dev), bus,
 					     value);
 	}
-
 	return 0;
 }
 
@@ -807,6 +806,9 @@ static void gt_setup_ide (struct pci_controller *hose,
 	u32 bar_response, bar_value;
 	int bar;
 
+	if (CPCI750_SLAVE_TEST != 0)
+		return;
+
 	for (bar = 0; bar < 6; bar++) {
 		/*ronen different function for 3rd bank. */
 		unsigned int offset =
@@ -833,6 +835,9 @@ static void gt_setup_cpcidvi (struct pci_controller *hose,
 {
 	u32		  bar_value, pci_response;
 
+	if (CPCI750_SLAVE_TEST != 0)
+		return;
+
 	pci_hose_read_config_dword (hose, dev, PCI_COMMAND, &pci_response);
 	pci_hose_write_config_dword (hose, dev, PCI_BASE_ADDRESS_0, 0xffffffff);
 	pci_hose_read_config_dword (hose, dev, PCI_BASE_ADDRESS_0, &pci_response);
@@ -911,6 +916,7 @@ struct pci_controller pci1_hose = {
 void pci_init_board (void)
 {
 	unsigned int command;
+	unsigned int slave;
 #ifdef CONFIG_PCI_PNP
 	unsigned int bar;
 #endif
@@ -922,6 +928,8 @@ void pci_init_board (void)
 	gt_cpcidvi_rom.base = 0;
 #endif
 
+	slave = CPCI750_SLAVE_TEST;
+
 	pci0_hose.config_table = gt_config_table;
 	pci1_hose.config_table = gt_config_table;
 
@@ -957,27 +965,40 @@ void pci_init_board (void)
 	pci0_hose.cfg_addr = (unsigned int *) PCI_HOST0;
 
 	pci_register_hose (&pci0_hose);
-	pciArbiterEnable (PCI_HOST0);
-	pciParkingDisable (PCI_HOST0, 1, 1, 1, 1, 1, 1, 1);
-	command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
-	command |= PCI_COMMAND_MASTER;
-	pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
-	command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
-	command |= PCI_COMMAND_MEMORY;
-	pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
+	if (slave == 0) {
+		pciArbiterEnable (PCI_HOST0);
+		pciParkingDisable (PCI_HOST0, 1, 1, 1, 1, 1, 1, 1);
+		command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
+		command |= PCI_COMMAND_MASTER;
+		pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
+		command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
+		command |= PCI_COMMAND_MEMORY;
+		pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
 
 #ifdef CONFIG_PCI_PNP
-	pciauto_config_init(&pci0_hose);
-	pciauto_region_allocate(pci0_hose.pci_io, 0x400, &bar);
+		pciauto_config_init(&pci0_hose);
+		pciauto_region_allocate(pci0_hose.pci_io, 0x400, &bar);
 #endif
 #ifdef CONFIG_PCI_SCAN_SHOW
-	printf("PCI:   Bus Dev VenId DevId Class Int\n");
+		printf("PCI:   Bus Dev VenId DevId Class Int\n");
 #endif
-	pci0_hose.last_busno = pci_hose_scan_bus (&pci0_hose, pci0_hose.first_busno);
+		pci0_hose.last_busno = pci_hose_scan_bus (&pci0_hose,
+							  pci0_hose.first_busno);
 
 #ifdef DEBUG
-	gt_pci_bus_mode_display (PCI_HOST1);
+		gt_pci_bus_mode_display (PCI_HOST1);
 #endif
+	} else {
+		pciArbiterDisable (PCI_HOST0);
+		pciParkingDisable (PCI_HOST0, 1, 1, 1, 1, 1, 1, 1);
+		command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
+		command |= PCI_COMMAND_MASTER;
+		pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
+		command = pciReadConfigReg (PCI_HOST0, PCI_COMMAND, SELF);
+		command |= PCI_COMMAND_MEMORY;
+		pciWriteConfigReg (PCI_HOST0, PCI_COMMAND, SELF, command);
+		pci0_hose.last_busno = pci0_hose.first_busno;
+	}
 	pci1_hose.first_busno = pci0_hose.last_busno + 1;
 	pci1_hose.last_busno = 0xff;
 	pci1_hose.current_busno = pci1_hose.first_busno;

include/configs/CPCI750.h

@@ -627,4 +627,6 @@
 
 #define CONFIG_SYS_BOARD_ASM_INIT	1
 
+#define CPCI750_SLAVE_TEST	(((in8(0xf0300000) & 0x80) == 0) ? 0 : 1)
+
 #endif	/* __CONFIG_H */