diff options
Diffstat (limited to 'src/northbridge/via/cn700/northbridge.c')
| -rw-r--r-- | src/northbridge/via/cn700/northbridge.c | 69 |
1 files changed, 57 insertions, 12 deletions
diff --git a/src/northbridge/via/cn700/northbridge.c b/src/northbridge/via/cn700/northbridge.c index 642661f308..3f4fe373d7 100644 --- a/src/northbridge/via/cn700/northbridge.c +++ b/src/northbridge/via/cn700/northbridge.c @@ -1,6 +1,8 @@ /* * This file is part of the coreboot project. * + * Copyright (C) 2008 VIA Technologies, Inc. + * (Written by Aaron Lwe <aaron.lwe@gmail.com> for VIA) * Copyright (C) 2007 Corey Osgood <corey.osgood@gmail.com> * * This program is free software; you can redistribute it and/or modify @@ -34,9 +36,11 @@ static void memctrl_init(device_t dev) { + device_t vlink_dev; u16 reg16; - - pci_write_config8(dev, 0x86, 0x2d); + u8 ranks; + u8 pagec, paged, pagee, pagef; + u8 shadowreg; /* Set up the vga framebuffer size */ reg16 = (log2(CONFIG_VIDEO_MB) << 12) | (1 << 15); @@ -45,8 +49,41 @@ static void memctrl_init(device_t dev) /* Set up VGA timers */ pci_write_config8(dev, 0xa2, 0x44); - pci_write_config16(dev, 0xb0, 0xaa60); + for (ranks = 0x4b; ranks >= 0x48; ranks--) { + if (pci_read_config8(dev, ranks)) { + ranks -= 0x48; + break; + } + } + if (ranks == 0x47) + ranks = 0x00; + reg16 = 0xaae0; + reg16 |= ranks; + /* GMINT Misc. FrameBuffer rank */ + pci_write_config16(dev, 0xb0, reg16); + /* AGPCINT Misc. */ pci_write_config8(dev, 0xb8, 0x08); + + /* shadown ram */ + pagec = 0xff, paged = 0xff, pagee = 0xff, pagef = 0x30; + /* PAGE C, D, E are all read write enable */ + pci_write_config8(dev, 0x80, pagec); + pci_write_config8(dev, 0x81, paged); + pci_write_config8(dev, 0x82, pagee); + /* PAGE F are read/writable */ + shadowreg = pci_read_config8(dev, 0x83); + shadowreg |= pagef; + pci_write_config8(dev, 0x83, shadowreg); + /* vlink mirror */ + vlink_dev = dev_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CN700_VLINK, 0); + if (vlink_dev) { + pci_write_config8(vlink_dev, 0x61, pagec); + pci_write_config8(vlink_dev, 0x62, paged); + pci_write_config8(vlink_dev, 0x64, pagee); + shadowreg = pci_read_config8(vlink_dev, 0x63); + shadowreg |= pagef; + pci_write_config8(vlink_dev, 0x63, shadowreg); + } } static const struct device_operations memctrl_operations = { @@ -124,7 +161,10 @@ static u32 find_pci_tolm(struct bus *bus) static void pci_domain_set_resources(device_t dev) { - static const u8 ramregs[] = {0x40, 0x41, 0x42, 0x43}; + /* + * the order is important to find the correct ram size. + */ + static const u8 ramregs[] = {0x43, 0x42, 0x41, 0x40}; device_t mc_dev; u32 pci_tolm; @@ -133,19 +173,25 @@ static void pci_domain_set_resources(device_t dev) pci_tolm = find_pci_tolm(&dev->link[0]); mc_dev = dev_find_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CN700_MEMCTRL, 0); - + if (mc_dev) { unsigned long tomk, tolmk; unsigned char rambits; int i, idx; + /* + * once the register value is not zero, the ramsize is + * this register's value multiply 64 * 1024 * 1024 + */ for(rambits = 0, i = 0; i < ARRAY_SIZE(ramregs); i++) { unsigned char reg; - reg = pci_read_config8(mc_dev, ramregs[i]); - rambits += reg; + rambits = pci_read_config8(mc_dev, ramregs[i]); + if (rambits != 0) + break; } - tomk = rambits; + tomk = rambits * 64 * 1024; + printk_spew("tomk is 0x%x\n", tomk); /* Compute the Top Of Low Memory, in Kb */ tolmk = pci_tolm >> 10; if (tolmk >= tomk) { @@ -156,16 +202,15 @@ static void pci_domain_set_resources(device_t dev) idx = 10; /* TODO: Hole needed? */ ram_resource(dev, idx++, 0, 640); /* first 640k */ - /* Leave a hole for vga */ - ram_resource(dev, idx++, 768, (tolmk - 768 - - (CONFIG_VIDEO_MB * 1024))); + /* Leave a hole for vga, 0xa0000 - 0xc0000 */ + ram_resource(dev, idx++, 768, (tolmk - 768 - CONFIG_VIDEO_MB * 1024)); } assign_resources(&dev->link[0]); } static unsigned int pci_domain_scan_bus(device_t dev, unsigned int max) { - printk_spew("Entering cn700 pci_domain_scan_bus.\n"); + printk_debug("Entering cn700 pci_domain_scan_bus.\n"); max = pci_scan_bus(&dev->link[0], PCI_DEVFN(0, 0), 0xff, max); return max; |