powernow-k8.c

linux-2.6.15.6

			data->currfid, reqfid);
		return 1;
	}

	if (savevid != data->currvid) {
		printk(KERN_ERR PFX "ph2: vid changed, save 0x%x, curr 0x%x\n",
			savevid, data->currvid);
		return 1;
	}

	dprintk("ph2 complete, currfid 0x%x, currvid 0x%x\n",
		data->currfid, data->currvid);

	return 0;
}

/* Phase 3 - core voltage transition flow ... jump to the final vid. */
static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid)
{
	u32 savefid = data->currfid;
	u32 savereqvid = reqvid;

	dprintk("ph3 (cpu%d): starting, currfid 0x%x, currvid 0x%x\n",
		smp_processor_id(),
		data->currfid, data->currvid);

	if (reqvid != data->currvid) {
		if (write_new_vid(data, reqvid))
			return 1;

		if (savefid != data->currfid) {
			printk(KERN_ERR PFX
			       "ph3: bad fid change, save 0x%x, curr 0x%x\n",
			       savefid, data->currfid);
			return 1;
		}

		if (data->currvid != reqvid) {
			printk(KERN_ERR PFX
			       "ph3: failed vid transition\n, req 0x%x, curr 0x%x",
			       reqvid, data->currvid);
			return 1;
		}
	}

	if (query_current_values_with_pending_wait(data))
		return 1;

	if (savereqvid != data->currvid) {
		dprintk("ph3 failed, currvid 0x%x\n", data->currvid);
		return 1;
	}

	if (savefid != data->currfid) {
		dprintk("ph3 failed, currfid changed 0x%x\n",
			data->currfid);
		return 1;
	}

	dprintk("ph3 complete, currfid 0x%x, currvid 0x%x\n",
		data->currfid, data->currvid);

	return 0;
}

static int check_supported_cpu(unsigned int cpu)
{
	cpumask_t oldmask = CPU_MASK_ALL;
	u32 eax, ebx, ecx, edx;
	unsigned int rc = 0;

	oldmask = current->cpus_allowed;
	set_cpus_allowed(current, cpumask_of_cpu(cpu));

	if (smp_processor_id() != cpu) {
		printk(KERN_ERR "limiting to cpu %u failed\n", cpu);
		goto out;
	}

	if (current_cpu_data.x86_vendor != X86_VENDOR_AMD)
		goto out;

	eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
	if (((eax & CPUID_USE_XFAM_XMOD) != CPUID_USE_XFAM_XMOD) ||
	    ((eax & CPUID_XFAM) != CPUID_XFAM_K8) ||
	    ((eax & CPUID_XMOD) > CPUID_XMOD_REV_F)) {
		printk(KERN_INFO PFX "Processor cpuid %x not supported\n", eax);
		goto out;
	}

	eax = cpuid_eax(CPUID_GET_MAX_CAPABILITIES);
	if (eax < CPUID_FREQ_VOLT_CAPABILITIES) {
		printk(KERN_INFO PFX
		       "No frequency change capabilities detected\n");
		goto out;
	}

	cpuid(CPUID_FREQ_VOLT_CAPABILITIES, &eax, &ebx, &ecx, &edx);
	if ((edx & P_STATE_TRANSITION_CAPABLE) != P_STATE_TRANSITION_CAPABLE) {
		printk(KERN_INFO PFX "Power state transitions not supported\n");
		goto out;
	}

	rc = 1;

out:
	set_cpus_allowed(current, oldmask);
	return rc;
}

static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
{
	unsigned int j;
	u8 lastfid = 0xff;

	for (j = 0; j < data->numps; j++) {
		if (pst[j].vid > LEAST_VID) {
			printk(KERN_ERR PFX "vid %d invalid : 0x%x\n", j, pst[j].vid);
			return -EINVAL;
		}
		if (pst[j].vid < data->rvo) {	/* vid + rvo >= 0 */
			printk(KERN_ERR BFX "0 vid exceeded with pstate %d\n", j);
			return -ENODEV;
		}
		if (pst[j].vid < maxvid + data->rvo) {	/* vid + rvo >= maxvid */
			printk(KERN_ERR BFX "maxvid exceeded with pstate %d\n", j);
			return -ENODEV;
		}
		if ((pst[j].fid > MAX_FID)
		    || (pst[j].fid & 1)
		    || (j && (pst[j].fid < HI_FID_TABLE_BOTTOM))) {
			/* Only first fid is allowed to be in "low" range */
			printk(KERN_ERR PFX "two low fids - %d : 0x%x\n", j, pst[j].fid);
			return -EINVAL;
		}
		if (pst[j].fid < lastfid)
			lastfid = pst[j].fid;
	}
	if (lastfid & 1) {
		printk(KERN_ERR PFX "lastfid invalid\n");
		return -EINVAL;
	}
	if (lastfid > LO_FID_TABLE_TOP)
		printk(KERN_INFO PFX  "first fid not from lo freq table\n");

	return 0;
}

static void print_basics(struct powernow_k8_data *data)
{
	int j;
	for (j = 0; j < data->numps; j++) {
		if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
			printk(KERN_INFO PFX "   %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j,
				data->powernow_table[j].index & 0xff,
				data->powernow_table[j].frequency/1000,
				data->powernow_table[j].index >> 8,
				find_millivolts_from_vid(data, data->powernow_table[j].index >> 8));
	}
	if (data->batps)
		printk(KERN_INFO PFX "Only %d pstates on battery\n", data->batps);
}

static int fill_powernow_table(struct powernow_k8_data *data, struct pst_s *pst, u8 maxvid)
{
	struct cpufreq_frequency_table *powernow_table;
	unsigned int j;

	if (data->batps) {    /* use ACPI support to get full speed on mains power */
		printk(KERN_WARNING PFX "Only %d pstates usable (use ACPI driver for full range\n", data->batps);
		data->numps = data->batps;
	}

	for ( j=1; j<data->numps; j++ ) {
		if (pst[j-1].fid >= pst[j].fid) {
			printk(KERN_ERR PFX "PST out of sequence\n");
			return -EINVAL;
		}
	}

	if (data->numps < 2) {
		printk(KERN_ERR PFX "no p states to transition\n");
		return -ENODEV;
	}

	if (check_pst_table(data, pst, maxvid))
		return -EINVAL;

	powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
		* (data->numps + 1)), GFP_KERNEL);
	if (!powernow_table) {
		printk(KERN_ERR PFX "powernow_table memory alloc failure\n");
		return -ENOMEM;
	}

	for (j = 0; j < data->numps; j++) {
		powernow_table[j].index = pst[j].fid; /* lower 8 bits */
		powernow_table[j].index |= (pst[j].vid << 8); /* upper 8 bits */
		powernow_table[j].frequency = find_khz_freq_from_fid(pst[j].fid);
	}
	powernow_table[data->numps].frequency = CPUFREQ_TABLE_END;
	powernow_table[data->numps].index = 0;

	if (query_current_values_with_pending_wait(data)) {
		kfree(powernow_table);
		return -EIO;
	}

	dprintk("cfid 0x%x, cvid 0x%x\n", data->currfid, data->currvid);
	data->powernow_table = powernow_table;
	print_basics(data);

	for (j = 0; j < data->numps; j++)
		if ((pst[j].fid==data->currfid) && (pst[j].vid==data->currvid))
			return 0;

	dprintk("currfid/vid do not match PST, ignoring\n");
	return 0;
}

/* Find and validate the PSB/PST table in BIOS. */
static int find_psb_table(struct powernow_k8_data *data)
{
	struct psb_s *psb;
	unsigned int i;
	u32 mvs;
	u8 maxvid;
	u32 cpst = 0;
	u32 thiscpuid;

	for (i = 0xc0000; i < 0xffff0; i += 0x10) {
		/* Scan BIOS looking for the signature. */
		/* It can not be at ffff0 - it is too big. */

		psb = phys_to_virt(i);
		if (memcmp(psb, PSB_ID_STRING, PSB_ID_STRING_LEN) != 0)
			continue;

		dprintk("found PSB header at 0x%p\n", psb);

		dprintk("table vers: 0x%x\n", psb->tableversion);
		if (psb->tableversion != PSB_VERSION_1_4) {
			printk(KERN_INFO BFX "PSB table is not v1.4\n");
			return -ENODEV;
		}

		dprintk("flags: 0x%x\n", psb->flags1);
		if (psb->flags1) {
			printk(KERN_ERR BFX "unknown flags\n");
			return -ENODEV;
		}

		data->vstable = psb->vstable;
		dprintk("voltage stabilization time: %d(*20us)\n", data->vstable);

		dprintk("flags2: 0x%x\n", psb->flags2);
		data->rvo = psb->flags2 & 3;
		data->irt = ((psb->flags2) >> 2) & 3;
		mvs = ((psb->flags2) >> 4) & 3;
		data->vidmvs = 1 << mvs;
		data->batps = ((psb->flags2) >> 6) & 3;

		dprintk("ramp voltage offset: %d\n", data->rvo);
		dprintk("isochronous relief time: %d\n", data->irt);
		dprintk("maximum voltage step: %d - 0x%x\n", mvs, data->vidmvs);

		dprintk("numpst: 0x%x\n", psb->num_tables);
		cpst = psb->num_tables;
		if ((psb->cpuid == 0x00000fc0) || (psb->cpuid == 0x00000fe0) ){
			thiscpuid = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
			if ((thiscpuid == 0x00000fc0) || (thiscpuid == 0x00000fe0) ) {
				cpst = 1;
			}
		}
		if (cpst != 1) {
			printk(KERN_ERR BFX "numpst must be 1\n");
			return -ENODEV;
		}

		data->plllock = psb->plllocktime;
		dprintk("plllocktime: 0x%x (units 1us)\n", psb->plllocktime);
		dprintk("maxfid: 0x%x\n", psb->maxfid);
		dprintk("maxvid: 0x%x\n", psb->maxvid);
		maxvid = psb->maxvid;

		data->numps = psb->numps;
		dprintk("numpstates: 0x%x\n", data->numps);
		return fill_powernow_table(data, (struct pst_s *)(psb+1), maxvid);
	}
	/*
	 * If you see this message, complain to BIOS manufacturer. If
	 * he tells you "we do not support Linux" or some similar
	 * nonsense, remember that Windows 2000 uses the same legacy
	 * mechanism that the old Linux PSB driver uses. Tell them it
	 * is broken with Windows 2000.
	 *
	 * The reference to the AMD documentation is chapter 9 in the
	 * BIOS and Kernel Developer's Guide, which is available on
	 * www.amd.com
	 */
	printk(KERN_INFO PFX "BIOS error - no PSB or ACPI _PSS objects\n");
	return -ENODEV;
}

#ifdef CONFIG_X86_POWERNOW_K8_ACPI
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index)
{
	if (!data->acpi_data.state_count)
		return;

	data->irt = (data->acpi_data.states[index].control >> IRT_SHIFT) & IRT_MASK;
	data->rvo = (data->acpi_data.states[index].control >> RVO_SHIFT) & RVO_MASK;
	data->exttype = (data->acpi_data.states[index].control >> EXT_TYPE_SHIFT) & EXT_TYPE_MASK;
	data->plllock = (data->acpi_data.states[index].control >> PLL_L_SHIFT) & PLL_L_MASK;
	data->vidmvs = 1 << ((data->acpi_data.states[index].control >> MVS_SHIFT) & MVS_MASK);
	data->vstable = (data->acpi_data.states[index].control >> VST_SHIFT) & VST_MASK;
}

static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
{
	int i;
	int cntlofreq = 0;
	struct cpufreq_frequency_table *powernow_table;

	if (acpi_processor_register_performance(&data->acpi_data, data->cpu)) {
		dprintk("register performance failed: bad ACPI data\n");
		return -EIO;
	}

	/* verify the data contained in the ACPI structures */
	if (data->acpi_data.state_count <= 1) {
		dprintk("No ACPI P-States\n");
		goto err_out;
	}

	if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE) ||
		(data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_FIXED_HARDWARE)) {
		dprintk("Invalid control/status registers (%x - %x)\n",
			data->acpi_data.control_register.space_id,
			data->acpi_data.status_register.space_id);
		goto err_out;
	}

	/* fill in data->powernow_table */
	powernow_table = kmalloc((sizeof(struct cpufreq_frequency_table)
		* (data->acpi_data.state_count + 1)), GFP_KERNEL);
	if (!powernow_table) {
		dprintk("powernow_table memory alloc failure\n");
		goto err_out;
	}

	for (i = 0; i < data->acpi_data.state_count; i++) {
		u32 fid;
		u32 vid;

		if (data->exttype) {
			fid = data->acpi_data.states[i].status & FID_MASK;
			vid = (data->acpi_data.states[i].status >> VID_SHIFT) & VID_MASK;
		} else {
			fid = data->acpi_data.states[i].control & FID_MASK;
			vid = (data->acpi_data.states[i].control >> VID_SHIFT) & VID_MASK;
		}

		dprintk("   %d : fid 0x%x, vid 0x%x\n", i, fid, vid);

		powernow_table[i].index = fid; /* lower 8 bits */
		powernow_table[i].index |= (vid << 8); /* upper 8 bits */
		powernow_table[i].frequency = find_khz_freq_from_fid(fid);

		/* verify frequency is OK */
		if ((powernow_table[i].frequency > (MAX_FREQ * 1000)) ||
			(powernow_table[i].frequency < (MIN_FREQ * 1000))) {
			dprintk("invalid freq %u kHz, ignoring\n", powernow_table[i].frequency);
			powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
			continue;
		}

		/* verify voltage is OK - BIOSs are using "off" to indicate invalid */
		if (vid == VID_OFF) {
			dprintk("invalid vid %u, ignoring\n", vid);
			powernow_table[i].frequency = CPUFREQ_ENTRY_INVALID;
			continue;
		}

		/* verify only 1 entry from the lo frequency table */
		if (fid < HI_FID_TABLE_BOTTOM) {
			if (cntlofreq) {
				/* if both entries are the same, ignore this
				 * one... 
				 */
				if ((powernow_table[i].frequency != powernow_table[cntlofreq].frequency) ||