src/drivers/generic/debug/debug_dev.c

#include <console/console.h>
#include <device/device.h>
#include <device/smbus.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <device/pci_ops.h>
#include <cpu/x86/msr.h>
#include <reset.h>
#include <delay.h>

static void print_pci_regs(struct device *dev)
{
      uint8_t byte;
      int i;

      for(i=0;i<256;i++) {
	      byte = pci_read_config8(dev, i);

	      if((i & 0xf)==0) printk(BIOS_DEBUG, "\n%02x:",i);
	      printk(BIOS_DEBUG, " %02x",byte);
      }
      printk(BIOS_DEBUG, "\n");
}

static void print_mem(void)
{
        unsigned int i;
	unsigned int start = 0xfffff000;
	for(i=start;i<0xffffffff;i++) {
             if((i & 0xf)==0) printk(BIOS_DEBUG, "\n %08x:",i);
             printk(BIOS_DEBUG, " %02x",(unsigned char)*((unsigned char *)i));
             }
	printk(BIOS_DEBUG, " %02x\n",(unsigned char)*((unsigned char *)i));

 }
static void print_pci_regs_all(void)
{
        struct device *dev;
	unsigned bus, device, function;

	for(bus=0; bus<256; bus++) {
		for(device=0; device<=0x1f; device++) {
			for (function=0; function<=7; function++){
				unsigned devfn;
				devfn = PCI_DEVFN(device, function);
				dev = dev_find_slot(bus, devfn);
				if(!dev) {
					continue;
				}
				if(!dev->enabled) {
					continue;
				}
			        printk(BIOS_DEBUG, "\n%02x:%02x:%02x aka %s",
					bus, device, function, dev_path(dev));
				print_pci_regs(dev);
			}
		}
	}
}

static void print_cpuid(void)
{
	msr_t msr;
	unsigned index;
	unsigned eax, ebx, ecx, edx;
	index = 0x80000007;
	printk(BIOS_DEBUG, "calling cpuid 0x%08x\n", index);
	asm volatile(
		"cpuid"
		: "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
		: "a" (index)
		);
	printk(BIOS_DEBUG, "cpuid[%08x]: %08x %08x %08x %08x\n",
		index, eax, ebx, ecx, edx);
	if (edx & (3 << 1)) {
		index = 0xC0010042;
		printk(BIOS_DEBUG, "Reading msr: 0x%08x\n", index);
		msr = rdmsr(index);
		printk(BIOS_DEBUG, "msr[0x%08x]: 0x%08x%08x\n",
			index, msr.hi, msr.lo);
	}

}
static void print_smbus_regs(struct device *dev)
{
	int j;
	printk(BIOS_DEBUG, "smbus: %s[%d]->", dev_path(dev->bus->dev), dev->bus->link_num);
	printk(BIOS_DEBUG, "%s", dev_path(dev));
	for(j = 0; j < 256; j++) {
		int status;
		unsigned char byte;
		status = smbus_read_byte(dev, j);
		if (status < 0) {
		//	printk(BIOS_DEBUG, "bad device status= %08x\n", status);
			break;
		}
                if ((j & 0xf) == 0) {
                        printk(BIOS_DEBUG, "\n%02x: ", j);
                }
		byte = status & 0xff;
		printk(BIOS_DEBUG, "%02x ", byte);
	}
	printk(BIOS_DEBUG, "\n");
}

static void print_smbus_regs_all(struct device *dev)
{
	struct device *child;
	struct bus *link;
	if (dev->enabled && dev->path.type == DEVICE_PATH_I2C)
	{
		// Here don't need to call smbus_set_link, because we scan it from top to down
		if( dev->bus->dev->path.type == DEVICE_PATH_I2C) { // it's under i2c MUX so set mux at first
			if(ops_smbus_bus(get_pbus_smbus(dev->bus->dev))) {
				if(dev->bus->dev->ops && dev->bus->dev->ops->set_link)
					dev->bus->dev->ops->set_link(dev->bus->dev, dev->bus->link_num);
			}
		}

		if(ops_smbus_bus(get_pbus_smbus(dev))) print_smbus_regs(dev);
	}

	for(link = dev->link_list; link; link = link->next) {
		for (child = link->children; child; child = child->sibling) {
			print_smbus_regs_all(child);
        	}
	}
}
static void print_msr_dualcore(void)
{
        msr_t msr;
        unsigned index;
        unsigned eax, ebx, ecx, edx;
        index = 0x80000008;
        printk(BIOS_DEBUG, "calling cpuid 0x%08x\n", index);
        asm volatile(
                "cpuid"
                : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
                : "a" (index)
                );
        printk(BIOS_DEBUG, "cpuid[%08x]: %08x %08x %08x %08x\n",
                index, eax, ebx, ecx, edx);

        printk(BIOS_DEBUG, "core number %d\n", ecx & 0xff);

        index = 0xc001001f;
        printk(BIOS_DEBUG, "Reading msr: 0x%08x\n", index);
        msr = rdmsr(index);
        printk(BIOS_DEBUG, "msr[0x%08x]: 0x%08x%08x bit 54 is %d\n",
                index, msr.hi, msr.lo, (msr.hi>> (54-32)) & 1);
#if 0
        msr.hi |= (1<<(54-32));
        wrmsr(index, msr);

        msr = rdmsr(index);
        printk(BIOS_DEBUG, "msr[0x%08x]: 0x%08x%08x\n",
                index, msr.hi, msr.lo);
#endif

}

static void print_cache_size(void)
{
	unsigned index;
	unsigned int n, eax, ebx, ecx, edx;

        index = 0x80000000;
        printk(BIOS_DEBUG, "calling cpuid 0x%08x\n", index);
        asm volatile(
                "cpuid"
                : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
                : "a" (index)
                );
        n = eax;

        if (n >= 0x80000005) {
	        index = 0x80000005;
	        printk(BIOS_DEBUG, "calling cpuid 0x%08x\n", index);
        	asm volatile(
                	"cpuid"
	                : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
        	        : "a" (index)
                	);
                printk(BIOS_DEBUG, "CPU: L1 I Cache: %dK (%d bytes/line), D cache %dK (%d bytes/line)\n",
                        edx>>24, edx&0xFF, ecx>>24, ecx&0xFF);
        }

        if (n >= 0x80000006) {
                index = 0x80000006;
                printk(BIOS_DEBUG, "calling cpuid 0x%08x\n", index);
                asm volatile(
                        "cpuid"
                        : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
                        : "a" (index)
                        );
        	printk(BIOS_DEBUG, "CPU: L2 Cache: %dK (%d bytes/line)\n",
                	ecx >> 16, ecx & 0xFF);
        }

}

struct tsc_struct {
        unsigned lo;
        unsigned hi;
};
typedef struct tsc_struct tsc_t;

static tsc_t rdtsc(void)
{
        tsc_t res;
        asm volatile(
                "rdtsc"
                : "=a" (res.lo), "=d"(res.hi) /* outputs */
                );
        return res;
}

static void print_tsc(void) {

	tsc_t tsc;
	tsc = rdtsc();
        printk(BIOS_DEBUG, "tsc: 0x%08x%08x\n",
                     tsc.hi, tsc.lo);
	udelay(1);
        tsc = rdtsc();
        printk(BIOS_DEBUG, "tsc: 0x%08x%08x after udelay(1) \n",
                     tsc.hi, tsc.lo);

}

static void debug_init(device_t dev)
{
	device_t parent;

	if (!dev->enabled)
		return;
	switch(dev->path.pnp.device) {
	case 0:
		parent = dev->bus->dev;
		printk(BIOS_DEBUG, "DEBUG: %s : %s\n", dev_path(parent), dev_name(parent));
		break;

	case 1:
		print_pci_regs_all();
		break;
	case 2:
		print_mem();
		break;
	case 3:
		print_cpuid();
		break;
	case 4:
		print_smbus_regs_all(&dev_root);
		break;
        case 5:
                print_msr_dualcore();
                break;
	case 6:
		print_cache_size();
		break;
	case 7:
		print_tsc();
		break;
	case 8:
		hard_reset();
		break;
	}
}

static void debug_noop(device_t dummy)
{
}

static struct device_operations debug_operations = {
        .read_resources   = debug_noop,
        .set_resources    = debug_noop,
        .enable_resources = debug_noop,
        .init             = debug_init,
};

static void enable_dev(struct device *dev)
{
	dev->ops = &debug_operations;
}

struct chip_operations drivers_generic_debug_ops = {
	CHIP_NAME("Debug device")
	.enable_dev = enable_dev,
};