src/northbridge/amd/amdk8/get_sblk_pci1234.c

/*============================================================================
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/* Copyright 2007 coresystems GmbH */

// 2005.9 yhlu    serengeti support
// 2005.9 yhlu    modify that to more dynamic for AMD Opteron Based MB
// 2007.9 stepan  improve code documentation

#include <console/console.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <string.h>
#include <stdint.h>

#include <cpu/amd/amdk8_sysconf.h>


#if 0
unsigned node_link_to_bus(unsigned node, unsigned link)
{
        device_t dev;
        unsigned reg;

        dev = dev_find_slot(0, PCI_DEVFN(0x18, 1));
        if (!dev) {
                return 0;
        }
        for(reg = 0xE0; reg < 0xF0; reg += 0x04) {
                uint32_t config_map;
                unsigned dst_node;
                unsigned dst_link;
                unsigned bus_base;
                config_map = pci_read_config32(dev, reg);
                if ((config_map & 3) != 3) {
                        continue;
                }
                dst_node = (config_map >> 4) & 7;
                dst_link = (config_map >> 8) & 3;
                bus_base = (config_map >> 16) & 0xff;
#if 0
                printk_debug("node.link=bus: %d.%d=%d 0x%2x->0x%08x\n",
                        dst_node, dst_link, bus_base,
                        reg, config_map);
#endif
                if ((dst_node == node) && (dst_link == link))
                {
                        return bus_base;
                }
        }
        return 0;
}
#endif


/**
 * Why we need the pci1234[] array
 *
 * It will keep the sequence of HT devices in the HT link registers even when a
 * given HT I/O card is not installed.
 *
 * The final result for pci1234[] will be
 *
 *     pci1234[0] will record the south bridge link and bus range
 *     pci1234[i] will record HT chain i.
 *
 * For example, on the Tyan S2885 coreboot_ram will put the AMD8151 chain (HT
 * link 0) into the register 0xE0, and the AMD8131/8111 HT chain into the
 * register 0xE4.
 *
 * So we need to make sure that the south bridge link will always be on
 * pci1234[0].
 *
 * Imagine a scenario with multiple HT I/O cards, where you don't install HT I/O 1, 
 * but you only install HT I/O 2 and HT I/O 3. The HT I/Os  will end up in registers 
 * 0xE4 and 0xE8.
 *
 * But we want to leave pci1234[1] to HT I/O 1 (even though it is disabled),
 * and let HT I/O 2 and HT I/O 3 still use pci1234[2] and pci1234[3].
 *
 * So we keep the sequence. You need to preset the pci1234[1], pci1234[2],
 * pci1234[3] for this purpose.
 *
 * For this example you need to set
 *
 *     unsigned pci1234[] = {
 *             0x0000ff0,
 *             0x0000f10, // HT IO 1 card always on node 1
 *             0x0000f20, // HT IO 2 card always on node 2
 *             0x0000f30  // HT IO 3 card always on node 3
 *     };
 *
 * For 2P + htio(n1) + htio(n0_1) + htio(n1_1), 2P + htio(n1) + 2P + htio(n2) + htio(n3):
 * You need an array pci1234[6]:
 *
 *     unsigned pci1234[] = {
 *             0x0000ff0,
 *             0x0000010, // HT IO 1 card always on node 1
 *             0x0000f00, // HT IO 2 card always on node 0
 *             0x0000110, // HT IO 3 card always on node 1
 *             0x0000f20, // HT IO 4 card always on node 2
 *             0x0000f30  // HT IO 5 card always on node 3
 *     };
 *
 *
 * For 4p+htio(n1)+htio(n2)+htio(n3),4p+htio(n1)+4p+htio(n6)+htio(n7):  
 * You need an array pci1234[6]:
 *
 *     unsigned pci1234[] = {
 *             0x0000ff0,
 *             0x0000f10, // HT IO 1 card always on node 1
 *             0x0000f20, // HT IO 2 card always on node 2
 *             0x0000f30, // HT IO 3 card always on node 3
 *             0x0000f60, // HT IO 4 card always on node 6
 *             0x0000f70  // HT IO 5 card always on node 7
 *     };
 * 
 * 
 * For 2p + htio(n1) + htio(n0_1) + htio(n1_1), 2P + htio(n1) + 2P + 
 * htio(n2) + htio(n3), 2P + htio(n1) + 4P + htio(n4) + htio(n5), 
 * you need an array pci1234[8]:
 *
 *     unsigned pci1234[] = {
 *             0x0000ff0,
 *             0x0000010, // HT IO 1 card always on node 1
 *             0x0000f00, // HT IO 2 card always on node 0
 *             0x0000110, // HT IO 3 card always on node 1
 *             0x0000f20, // HT IO 4 card always on node 2
 *             0x0000f30  // HT IO 5 card always on node 3
 *             0x0000f40, // HT IO 6 card always on node 4
 *             0x0000f50  // HT IO 7 card always on node 5
 *     };
 * 
 * 
 * For 4P + htio(n1) + htio(n2) + htio(n3), 4p + htio(n1) + 2p + htio(n4) +
 * htio(n5), 4p + htio(n1) + 4p + htio(n6) + htio(n7), 
 * you need an array pci1234[8]:
 *
 *     unsigned pci1234[] = {
 *             0x0000ff0,
 *             0x0000f10, // HT IO 1 card always on node 1
 *             0x0000f20, // HT IO 2 card always on node 2
 *             0x0000f30, // HT IO 3 card always on node 3
 *             0x0000f40, // HT IO 4 card always on node 4
 *             0x0000f50  // HT IO 5 card always on node 5
 *             0x0000f60, // HT IO 6 card always on node 6
 *             0x0000f70  // HT IO 7 card always on node 7
 *     };
 * 
 * 
 * So the maximum posible value of HC_POSSIBLE_NUM is 8. (FIXME Why?)
 * 
 *     1n:       3
 *     2n: 2x2 - 1
 *     4n: 1x4 - 2 
 *     6n:       2 
 *     8n:       2 
 *  Total:      12 
 * 
 * Just put all the possible HT Node/link to the list tp pci1234[] in 
 * src/mainboard/<vendor>/<mainboard>get_bus_conf.c
 * 
 * Also don't forget to increase the ACPI_SSDTX_NUM etc (FIXME what else) if
 * you have too many SSDTs
 * 
 * What about co-processor in socket 1 on a 2 way system? Or socket 2 and
 * socket 3 on a 4 way system? Treat that as an HC, too!
 * 
 */

void get_sblk_pci1234(void)
{

        device_t dev;
        int i,j;
        uint32_t dword;

        /* read PCI_DEV(0,0x18,0) 0x64 bit [8:9] to find out SbLink m */
        dev = dev_find_slot(0, PCI_DEVFN(0x18,0));
        dword = pci_read_config32(dev, 0x64);
        sysconf.sblk = (dword>>8) & 0x3;

        dword &=0x0300;
        dword |= 1;
        sysconf.pci1234[0] = dword;
	sysconf.hcid[0] = 0;

        /* About hardcoded numbering for HT_IO support
	 *
	 * Set the node_id and link_id that could have a HT chain in the one
	 * array, (FIXME: which one?) then check if is enabled. Then update
	 * final value 
         */

        /* Here we need to set hcdn
	 *
	 * 1. hypertransport.c needs to record hcdn_reg together with 0xe0,
	 *    0xe4, 0xe8, 0xec when are set (FIXME: when WHAT is set?)
	 *
	 * 2. So at the same time we need update hcdn with hcdn_reg here. FIXME: Why?
	 */

        dev = dev_find_slot(0, PCI_DEVFN(0x18, 1));

        for(j=0;j<4;j++) {
                uint32_t dwordx;
                dwordx = pci_read_config32(dev, 0xe0 + j*4);
                dwordx &=0xffff0ff1; /* keep bus num, node_id, link_num, enable bits */
                if((dwordx & 0xff1) == dword) { /* SBLINK */
                        sysconf.pci1234[0] = dwordx;
			sysconf.hcdn[0] = sysconf.hcdn_reg[j];
                        continue;
                }

                if((dwordx & 1) == 1) {
                        /* We need to find out the number of HC
                         * for exact match
			 */
                        for(i=1;i<sysconf.hc_possible_num;i++) {
                                if((dwordx & 0xff0) == (sysconf.pci1234[i] & 0xff0)) {
                                        sysconf.pci1234[i] = dwordx;
					sysconf.hcdn[i] = sysconf.hcdn_reg[j];
                                        break;
                                }
                        }

                        /* For 0xff0 match or same node */
                        for(i=1;i<sysconf.hc_possible_num;i++) {
                                if((dwordx & 0xff0) == (dwordx & sysconf.pci1234[i] & 0xff0)) {
                                        sysconf.pci1234[i] = dwordx;
					sysconf.hcdn[i] = sysconf.hcdn_reg[j];
                                        break;
                                }
                        }
                }
        }

        for(i=1;i<sysconf.hc_possible_num;i++) {
                if((sysconf.pci1234[i] & 1) != 1) {
                        sysconf.pci1234[i] = 0;
			sysconf.hcdn[i] = 0x20202020;
                }
		sysconf.hcid[i] = 0;
        }

}