[CPUFREQ] Longhaul - Add voltage scaling to driver
Rename option "dont_scale_voltage" to "scale_voltage" because don't will be default. Use "pos" for calculating voltage. In this way driver don't need to know mV value or low level value. Simply min U is one pos and max U is second pos. All pos between these two are used. Assume that min U is for min f and max U for max f. For frequency between min and max calculate pos based on difference between current frequency and min f. Values in mobile VRM table changed to values from C3-M datasheet. Signed-off-by: Rafa³ Bilski <rafalbilski@interia.pl> Signed-off-by: Dave Jones <davej@redhat.com>hifive-unleashed-5.1
Rafa³ Bilski
Dave Jones
parent
23e735bc7b
commit
db44aaf3a2
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@ -53,19 +53,26 @@
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#define CPU_NEHEMIAH 5
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static int cpu_model;
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static unsigned int numscales=16, numvscales;
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static unsigned int numscales=16;
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static unsigned int fsb;
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static int minvid, maxvid;
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static struct mV_pos *vrm_mV_table;
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static unsigned char *mV_vrm_table;
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struct f_msr {
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unsigned char vrm;
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};
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static struct f_msr f_msr_table[32];
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static unsigned int highest_speed, lowest_speed; /* kHz */
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static unsigned int minmult, maxmult;
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static int can_scale_voltage;
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static int vrmrev;
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static struct acpi_processor *pr = NULL;
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static struct acpi_processor_cx *cx = NULL;
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static int port22_en = 0;
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static int port22_en;
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/* Module parameters */
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static int dont_scale_voltage;
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static int ignore_latency = 0;
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static int scale_voltage;
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static int ignore_latency;
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#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "longhaul", msg)
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@ -73,7 +80,6 @@ static int ignore_latency = 0;
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/* Clock ratios multiplied by 10 */
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static int clock_ratio[32];
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static int eblcr_table[32];
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static int voltage_table[32];
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static unsigned int highest_speed, lowest_speed; /* kHz */
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static int longhaul_version;
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static struct cpufreq_frequency_table *longhaul_table;
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@ -163,6 +169,11 @@ static void do_powersaver(int cx_address, unsigned int clock_ratio_index)
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longhaul.bits.SoftBusRatio4 = (clock_ratio_index & 0x10) >> 4;
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longhaul.bits.EnableSoftBusRatio = 1;
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if (can_scale_voltage) {
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longhaul.bits.SoftVID = f_msr_table[clock_ratio_index].vrm;
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longhaul.bits.EnableSoftVID = 1;
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}
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/* Sync to timer tick */
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safe_halt();
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/* Change frequency on next halt or sleep */
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@ -454,53 +465,57 @@ static int __init longhaul_get_ranges(void)
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static void __init longhaul_setup_voltagescaling(void)
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{
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union msr_longhaul longhaul;
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struct mV_pos minvid, maxvid;
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unsigned int j, speed, pos, kHz_step, numvscales;
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rdmsrl (MSR_VIA_LONGHAUL, longhaul.val);
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if (!(longhaul.bits.RevisionID & 1))
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rdmsrl(MSR_VIA_LONGHAUL, longhaul.val);
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if (!(longhaul.bits.RevisionID & 1)) {
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printk(KERN_INFO PFX "Voltage scaling not supported by CPU.\n");
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return;
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}
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minvid = longhaul.bits.MinimumVID;
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maxvid = longhaul.bits.MaximumVID;
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vrmrev = longhaul.bits.VRMRev;
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if (!longhaul.bits.VRMRev) {
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printk (KERN_INFO PFX "VRM 8.5\n");
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vrm_mV_table = &vrm85_mV[0];
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mV_vrm_table = &mV_vrm85[0];
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} else {
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printk (KERN_INFO PFX "Mobile VRM\n");
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vrm_mV_table = &mobilevrm_mV[0];
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mV_vrm_table = &mV_mobilevrm[0];
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}
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if (minvid == 0 || maxvid == 0) {
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minvid = vrm_mV_table[longhaul.bits.MinimumVID];
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maxvid = vrm_mV_table[longhaul.bits.MaximumVID];
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numvscales = maxvid.pos - minvid.pos + 1;
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kHz_step = (highest_speed - lowest_speed) / numvscales;
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if (minvid.mV == 0 || maxvid.mV == 0 || minvid.mV > maxvid.mV) {
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printk (KERN_INFO PFX "Bogus values Min:%d.%03d Max:%d.%03d. "
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"Voltage scaling disabled.\n",
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minvid/1000, minvid%1000, maxvid/1000, maxvid%1000);
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minvid.mV/1000, minvid.mV%1000, maxvid.mV/1000, maxvid.mV%1000);
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return;
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}
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if (minvid == maxvid) {
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if (minvid.mV == maxvid.mV) {
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printk (KERN_INFO PFX "Claims to support voltage scaling but min & max are "
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"both %d.%03d. Voltage scaling disabled\n",
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maxvid/1000, maxvid%1000);
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maxvid.mV/1000, maxvid.mV%1000);
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return;
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}
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if (vrmrev==0) {
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dprintk ("VRM 8.5\n");
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memcpy (voltage_table, vrm85scales, sizeof(voltage_table));
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numvscales = (voltage_table[maxvid]-voltage_table[minvid])/25;
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} else {
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dprintk ("Mobile VRM\n");
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memcpy (voltage_table, mobilevrmscales, sizeof(voltage_table));
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numvscales = (voltage_table[maxvid]-voltage_table[minvid])/5;
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printk(KERN_INFO PFX "Max VID=%d.%03d Min VID=%d.%03d, %d possible voltage scales\n",
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maxvid.mV/1000, maxvid.mV%1000,
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minvid.mV/1000, minvid.mV%1000,
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numvscales);
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j = 0;
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while (longhaul_table[j].frequency != CPUFREQ_TABLE_END) {
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speed = longhaul_table[j].frequency;
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pos = (speed - lowest_speed) / kHz_step + minvid.pos;
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f_msr_table[longhaul_table[j].index].vrm = mV_vrm_table[pos];
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j++;
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}
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/* Current voltage isn't readable at first, so we need to
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set it to a known value. The spec says to use maxvid */
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longhaul.bits.RevisionKey = longhaul.bits.RevisionID; /* FIXME: This is bad. */
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longhaul.bits.EnableSoftVID = 1;
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longhaul.bits.SoftVID = maxvid;
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wrmsrl (MSR_VIA_LONGHAUL, longhaul.val);
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minvid = voltage_table[minvid];
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maxvid = voltage_table[maxvid];
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dprintk ("Min VID=%d.%03d Max VID=%d.%03d, %d possible voltage scales\n",
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maxvid/1000, maxvid%1000, minvid/1000, minvid%1000, numvscales);
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can_scale_voltage = 1;
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}
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@ -685,7 +700,7 @@ static int __init longhaul_cpu_init(struct cpufreq_policy *policy)
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return ret;
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if ((longhaul_version==TYPE_LONGHAUL_V2 || longhaul_version==TYPE_POWERSAVER) &&
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(dont_scale_voltage==0))
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(scale_voltage != 0))
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longhaul_setup_voltagescaling();
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policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
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@ -773,8 +788,8 @@ static void __exit longhaul_exit(void)
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kfree(longhaul_table);
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}
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module_param (dont_scale_voltage, int, 0644);
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MODULE_PARM_DESC(dont_scale_voltage, "Don't scale voltage of processor");
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module_param (scale_voltage, int, 0644);
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MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor");
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module_param(ignore_latency, int, 0644);
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MODULE_PARM_DESC(ignore_latency, "Skip ACPI C3 latency test");
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@ -450,17 +450,45 @@ static int __initdata nehemiah_c_eblcr[32] = {
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* Voltage scales. Div/Mod by 1000 to get actual voltage.
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* Which scale to use depends on the VRM type in use.
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*/
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static int __initdata vrm85scales[32] = {
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1250, 1200, 1150, 1100, 1050, 1800, 1750, 1700,
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1650, 1600, 1550, 1500, 1450, 1400, 1350, 1300,
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1275, 1225, 1175, 1125, 1075, 1825, 1775, 1725,
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1675, 1625, 1575, 1525, 1475, 1425, 1375, 1325,
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struct mV_pos {
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unsigned short mV;
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unsigned short pos;
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};
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static int __initdata mobilevrmscales[32] = {
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2000, 1950, 1900, 1850, 1800, 1750, 1700, 1650,
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1600, 1550, 1500, 1450, 1500, 1350, 1300, -1,
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1275, 1250, 1225, 1200, 1175, 1150, 1125, 1100,
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1075, 1050, 1025, 1000, 975, 950, 925, -1,
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static struct mV_pos __initdata vrm85_mV[32] = {
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{1250, 8}, {1200, 6}, {1150, 4}, {1100, 2},
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{1050, 0}, {1800, 30}, {1750, 28}, {1700, 26},
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{1650, 24}, {1600, 22}, {1550, 20}, {1500, 18},
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{1450, 16}, {1400, 14}, {1350, 12}, {1300, 10},
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{1275, 9}, {1225, 7}, {1175, 5}, {1125, 3},
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{1075, 1}, {1825, 31}, {1775, 29}, {1725, 27},
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{1675, 25}, {1625, 23}, {1575, 21}, {1525, 19},
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{1475, 17}, {1425, 15}, {1375, 13}, {1325, 11}
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};
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static unsigned char __initdata mV_vrm85[32] = {
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0x04, 0x14, 0x03, 0x13, 0x02, 0x12, 0x01, 0x11,
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0x00, 0x10, 0x0f, 0x1f, 0x0e, 0x1e, 0x0d, 0x1d,
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0x0c, 0x1c, 0x0b, 0x1b, 0x0a, 0x1a, 0x09, 0x19,
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0x08, 0x18, 0x07, 0x17, 0x06, 0x16, 0x05, 0x15
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};
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static struct mV_pos __initdata mobilevrm_mV[32] = {
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{1750, 31}, {1700, 30}, {1650, 29}, {1600, 28},
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{1550, 27}, {1500, 26}, {1450, 25}, {1400, 24},
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{1350, 23}, {1300, 22}, {1250, 21}, {1200, 20},
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{1150, 19}, {1100, 18}, {1050, 17}, {1000, 16},
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{975, 15}, {950, 14}, {925, 13}, {900, 12},
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{875, 11}, {850, 10}, {825, 9}, {800, 8},
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{775, 7}, {750, 6}, {725, 5}, {700, 4},
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{675, 3}, {650, 2}, {625, 1}, {600, 0}
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};
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static unsigned char __initdata mV_mobilevrm[32] = {
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0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
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0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
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0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
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0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
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};
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