[PATCH 5/6] MIPS: malta: add support for PCI driver model

[Daniel Schwierzeck]

As almost all peripherals are connected via PCI dependent on the
used core card, PCI setup is always required. Thus run pci_init()
including PCI scanning and probing and core card specific setups
in board_early_init_r().

Also prepare support for dynamically managing the status of the
different PCI DT nodes dependent on used core card via option
CONFIG_OF_BOARD_FIXUP. Before this feature can be enabled,
the call order of the fix_fdt() init hook in board_init_f
needs to be changed. Otherwise rw_fdt_blob points to a read-only
NOR flash address. Thus this options needs to stay disabled
until the board_init_f problem could be solved. This breaks
running the default U-Boot image on real HW using the FPGA core
card but Qemu emulation still works. Currently Qemu is more
important as MIPS CI tests depend on Malta and the deadline
for PCI DM conversion will be enforced soon.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
---

 board/imgtec/malta/malta.c | 84 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 83 insertions(+), 1 deletion(-)

diff --git a/board/imgtec/malta/malta.c b/board/imgtec/malta/malta.c
index c04f727961..e78d5a7fbc 100644
--- a/board/imgtec/malta/malta.c
+++ b/board/imgtec/malta/malta.c
@@ -4,7 +4,8 @@
  * Copyright (C) 2013 Imagination Technologies
  */
 
-#include <common.h>
+#include <config.h>
+#include <fdt_support.h>
 #include <ide.h>
 #include <init.h>
 #include <net.h>
@@ -24,6 +25,9 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+#define MALTA_GT_PATH	 "/pci0 at 1be00000"
+#define MALTA_MSC_PATH	 "/pci0 at 1bd00000"
+
 enum core_card {
 	CORE_UNKNOWN,
 	CORE_LV,
@@ -120,10 +124,12 @@ int checkboard(void)
 	return 0;
 }
 
+#if !IS_ENABLED(CONFIG_DM_ETH)
 int board_eth_init(struct bd_info *bis)
 {
 	return pci_eth_init(bis);
 }
+#endif
 
 void _machine_restart(void)
 {
@@ -167,6 +173,81 @@ int misc_init_r(void)
 	return 0;
 }
 
+#if IS_ENABLED(CONFIG_OF_BOARD_FIXUP)
+/*
+ * TODO: currently doesn't work because rw_fdt_blob points to a
+ * NOR flash address. This needs some changes in board_init_f.
+ */
+int board_fix_fdt(void *rw_fdt_blob)
+{
+	int node = -1;
+
+	switch (malta_sys_con()) {
+	case SYSCON_GT64120:
+		node =  fdt_path_offset(rw_fdt_blob, MALTA_GT_PATH);
+		break;
+	default:
+	case SYSCON_MSC01:
+		node =  fdt_path_offset(rw_fdt_blob, MALTA_MSC_PATH);
+		break;
+	}
+
+	return fdt_status_okay(rw_fdt_blob, node);
+}
+#endif
+
+#if IS_ENABLED(CONFIG_DM_PCI)
+int board_early_init_r(void)
+{
+	struct udevice *dev;
+	u32 val32;
+	u8 val8;
+	int ret;
+
+	pci_init();
+
+	ret = dm_pci_find_device(PCI_VENDOR_ID_INTEL,
+				 PCI_DEVICE_ID_INTEL_82371AB_0, 0, &dev);
+	if (ret)
+		panic("Failed to find PIIX4 PCI bridge\n");
+
+	/* setup PCI interrupt routing */
+	dm_pci_write_config8(dev, PCI_CFG_PIIX4_PIRQRCA, 10);
+	dm_pci_write_config8(dev, PCI_CFG_PIIX4_PIRQRCB, 10);
+	dm_pci_write_config8(dev, PCI_CFG_PIIX4_PIRQRCC, 11);
+	dm_pci_write_config8(dev, PCI_CFG_PIIX4_PIRQRCD, 11);
+
+	/* mux SERIRQ onto SERIRQ pin */
+	dm_pci_read_config32(dev, PCI_CFG_PIIX4_GENCFG, &val32);
+	val32 |= PCI_CFG_PIIX4_GENCFG_SERIRQ;
+	dm_pci_write_config32(dev, PCI_CFG_PIIX4_GENCFG, val32);
+
+	/* enable SERIRQ - Linux currently depends upon this */
+	dm_pci_read_config8(dev, PCI_CFG_PIIX4_SERIRQC, &val8);
+	val8 |= PCI_CFG_PIIX4_SERIRQC_EN | PCI_CFG_PIIX4_SERIRQC_CONT;
+	dm_pci_write_config8(dev, PCI_CFG_PIIX4_SERIRQC, val8);
+
+	ret = dm_pci_find_device(PCI_VENDOR_ID_INTEL,
+				 PCI_DEVICE_ID_INTEL_82371AB, 0, &dev);
+	if (ret)
+		panic("Failed to find PIIX4 IDE controller\n");
+
+	/* enable bus master & IO access */
+	val32 |= PCI_COMMAND_MASTER | PCI_COMMAND_IO;
+	dm_pci_write_config32(dev, PCI_COMMAND, val32);
+
+	/* set latency */
+	dm_pci_write_config8(dev, PCI_LATENCY_TIMER, 0x40);
+
+	/* enable IDE/ATA */
+	dm_pci_write_config32(dev, PCI_CFG_PIIX4_IDETIM_PRI,
+			      PCI_CFG_PIIX4_IDETIM_IDE);
+	dm_pci_write_config32(dev, PCI_CFG_PIIX4_IDETIM_SEC,
+			      PCI_CFG_PIIX4_IDETIM_IDE);
+
+	return 0;
+}
+#else
 void pci_init_board(void)
 {
 	pci_dev_t bdf;
@@ -231,3 +312,4 @@ void pci_init_board(void)
 	pci_write_config_dword(bdf, PCI_CFG_PIIX4_IDETIM_SEC,
 			       PCI_CFG_PIIX4_IDETIM_IDE);
 }
+#endif
-- 
2.32.0