1 files changed, 122 insertions, 0 deletions
diff --git a/src/northbridge/via/vt8623/northbridge.c b/src/northbridge/via/vt8623/northbridge.c
new file mode 100644
index 0000000000..5f5e5d9dd8
--- /dev/null
+++ b/src/northbridge/via/vt8623/northbridge.c
@@ -0,0 +1,122 @@
+#include <console/console.h>
+#include <arch/io.h>
+#include <stdint.h>
+#include <mem.h>
+#include <part/sizeram.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/hypertransport.h>
+#include <device/chip.h>
+#include <stdlib.h>
+#include <string.h>
+#include <bitops.h>
+#include "chip.h"
+#include "northbridge.h"
+
+static const uint8_t ramregs[] = {0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 
+	  				0x56, 0x57};
+
+struct mem_range *sizeram(void)
+{
+	unsigned long mmio_basek;
+	static struct mem_range mem[10];
+	device_t dev;
+	int i, idx;
+	unsigned char rambits;
+
+	dev = dev_find_slot(0, 0);
+	if (!dev) {
+		printk_err("Cannot find PCI: 0:0\n");
+		return 0;
+	}
+	mem[0].basek = 0;
+	mem[0].sizek = 65536;
+	idx = 1;
+	while(idx < sizeof(mem)/sizeof(mem[0])) {
+		mem[idx].basek = 0;
+		mem[idx].sizek = 0;
+		idx++;
+	}
+	for(rambits = 0, i = 0; i < sizeof(ramregs)/sizeof(ramregs[0]); i++) {
+		unsigned char reg;
+		reg = pci_read_config8(dev, ramregs[i]);
+		/* these are ENDING addresses, not sizes. 
+		 * if there is memory in this slot, then reg will be > rambits.
+		 * So we just take the max, that gives us total. 
+		 * We take the highest one to cover for once and future linuxbios
+		 * bugs. We warn about bugs.
+		 */
+		if (reg > rambits)
+			rambits = reg;
+		if (reg < rambits)
+			printk_err("ERROR! register 0x%x is not set!\n", 
+				ramregs[i]);
+	}
+	
+	printk_debug("I would set ram size to 0x%x Kbytes\n", (rambits)*8*1024);
+	mem[0].sizek = rambits*8*1024;
+#if 1
+	for(i = 0; i < idx; i++) {
+		printk_debug("mem[%d].basek = %08x mem[%d].sizek = %08x\n",
+			i, mem[i].basek, i, mem[i].sizek);
+	}
+#endif
+
+	return mem;
+}
+static void enumerate(struct chip *chip)
+{
+	extern struct device_operations default_pci_ops_bus;
+	chip_enumerate(chip);
+	chip->dev->ops = &default_pci_ops_bus;
+}
+
+/*
+ * This fixup is based on capturing values from an Award bios.  Without
+ * this fixup the DMA write performance is awful (i.e. hdparm -t /dev/hda is 20x
+ * slower than normal, ethernet drops packets).
+ * Apparently these registers govern some sort of bus master behavior.
+ */
+static void random_fixup() {
+	device_t pcidev = dev_find_slot(0, 0);
+
+	printk_spew("VT8601 random fixup ...\n");
+	if (pcidev) {
+		pci_write_config8(pcidev, 0x70, 0xc0);
+		pci_write_config8(pcidev, 0x71, 0x88);
+		pci_write_config8(pcidev, 0x72, 0xec);
+		pci_write_config8(pcidev, 0x73, 0x0c);
+		pci_write_config8(pcidev, 0x74, 0x0e);
+		pci_write_config8(pcidev, 0x75, 0x81);
+		pci_write_config8(pcidev, 0x76, 0x52);
+	}
+}
+
+static void northbridge_init(struct chip *chip, enum chip_pass pass)
+{
+
+	struct northbridge_via_vt8601_config *conf = 
+		(struct northbridge_via_vt8601_config *)chip->chip_info;
+
+	switch (pass) {
+	case CONF_PASS_PRE_PCI:
+		break;
+		
+	case CONF_PASS_POST_PCI:
+		break;
+		
+	case CONF_PASS_PRE_BOOT:
+		random_fixup();
+		break;
+		
+	default:
+		/* nothing yet */
+		break;
+	}
+}
+
+struct chip_control northbridge_via_vt8601_control = {
+	.enumerate = enumerate,
+	.enable    = northbridge_init,
+	.name      = "VIA vt8601 Northbridge",
+};