rt2x00:Add VCO recalibration

Signed-off-by: John Li <chen-yang.li@mediatek.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

10 files changed, 171 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800.h b/drivers/net/wireless/rt2x00/rt2800.h
index 06acabd02984..62e697ffc6d1 100644
--- a/drivers/net/wireless/rt2x00/rt2800.h
+++ b/drivers/net/wireless/rt2x00/rt2800.h
@@ -965,6 +965,7 @@
  * TX_PIN_CFG:
  */
 #define TX_PIN_CFG                      0x1328
+#define TX_PIN_CFG_PA_PE_DISABLE        0xfcfffff0
 #define TX_PIN_CFG_PA_PE_A0_EN          FIELD32(0x00000001)
 #define TX_PIN_CFG_PA_PE_G0_EN          FIELD32(0x00000002)
 #define TX_PIN_CFG_PA_PE_A1_EN          FIELD32(0x00000004)
@@ -985,6 +986,14 @@
 #define TX_PIN_CFG_RFTR_POL             FIELD32(0x00020000)
 #define TX_PIN_CFG_TRSW_EN              FIELD32(0x00040000)
 #define TX_PIN_CFG_TRSW_POL             FIELD32(0x00080000)
+#define TX_PIN_CFG_PA_PE_A2_EN          FIELD32(0x01000000)
+#define TX_PIN_CFG_PA_PE_G2_EN          FIELD32(0x02000000)
+#define TX_PIN_CFG_PA_PE_A2_POL         FIELD32(0x04000000)
+#define TX_PIN_CFG_PA_PE_G2_POL         FIELD32(0x08000000)
+#define TX_PIN_CFG_LNA_PE_A2_EN         FIELD32(0x10000000)
+#define TX_PIN_CFG_LNA_PE_G2_EN         FIELD32(0x20000000)
+#define TX_PIN_CFG_LNA_PE_A2_POL        FIELD32(0x40000000)
+#define TX_PIN_CFG_LNA_PE_G2_POL        FIELD32(0x80000000)
 
 /*
  * TX_BAND_CFG: 0x1 use upper 20MHz, 0x0 use lower 20MHz
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.c b/drivers/net/wireless/rt2x00/rt2800lib.c
index f1df929e97a7..6104a14e4fff 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.c
+++ b/drivers/net/wireless/rt2x00/rt2800lib.c
@@ -2497,6 +2497,80 @@ void rt2800_gain_calibration(struct rt2x00_dev *rt2x00dev)
 }
 EXPORT_SYMBOL_GPL(rt2800_gain_calibration);
 
+void rt2800_vco_calibration(struct rt2x00_dev *rt2x00dev)
+{
+        u32     tx_pin;
+        u8      rfcsr;
+
+        /*
+         * A voltage-controlled oscillator(VCO) is an electronic oscillator
+         * designed to be controlled in oscillation frequency by a voltage
+         * input. Maybe the temperature will affect the frequency of
+         * oscillation to be shifted. The VCO calibration will be called
+         * periodically to adjust the frequency to be precision.
+        */
+
+        rt2800_register_read(rt2x00dev, TX_PIN_CFG, &tx_pin);
+        tx_pin &= TX_PIN_CFG_PA_PE_DISABLE;
+        rt2800_register_write(rt2x00dev, TX_PIN_CFG, tx_pin);
+
+        switch (rt2x00dev->chip.rf) {
+        case RF2020:
+        case RF3020:
+        case RF3021:
+        case RF3022:
+        case RF3320:
+        case RF3052:
+                rt2800_rfcsr_read(rt2x00dev, 7, &rfcsr);
+                rt2x00_set_field8(&rfcsr, RFCSR7_RF_TUNING, 1);
+                rt2800_rfcsr_write(rt2x00dev, 7, rfcsr);
+                break;
+        case RF5370:
+        case RF5372:
+        case RF5390:
+                rt2800_rfcsr_read(rt2x00dev, 3, &rfcsr);
+                rt2x00_set_field8(&rfcsr, RFCSR30_RF_CALIBRATION, 1);
+                rt2800_rfcsr_write(rt2x00dev, 3, rfcsr);
+                break;
+        default:
+                return;
+        }
+
+        mdelay(1);
+
+        rt2800_register_read(rt2x00dev, TX_PIN_CFG, &tx_pin);
+        if (rt2x00dev->rf_channel <= 14) {
+                switch (rt2x00dev->default_ant.tx_chain_num) {
+                case 3:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_G2_EN, 1);
+                        /* fall through */
+                case 2:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_G1_EN, 1);
+                        /* fall through */
+                case 1:
+                default:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_G0_EN, 1);
+                        break;
+                }
+        } else {
+                switch (rt2x00dev->default_ant.tx_chain_num) {
+                case 3:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_A2_EN, 1);
+                        /* fall through */
+                case 2:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_A1_EN, 1);
+                        /* fall through */
+                case 1:
+                default:
+                        rt2x00_set_field32(&tx_pin, TX_PIN_CFG_PA_PE_A0_EN, 1);
+                        break;
+                }
+        }
+        rt2800_register_write(rt2x00dev, TX_PIN_CFG, tx_pin);
+
+}
+EXPORT_SYMBOL_GPL(rt2800_vco_calibration);
+
 static void rt2800_config_retry_limit(struct rt2x00_dev *rt2x00dev,
                                       struct rt2x00lib_conf *libconf)
 {
@@ -4451,6 +4525,20 @@ int rt2800_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
                 }
         }
 
+        switch (rt2x00dev->chip.rf) {
+        case RF2020:
+        case RF3020:
+        case RF3021:
+        case RF3022:
+        case RF3320:
+        case RF3052:
+        case RF5370:
+        case RF5372:
+        case RF5390:
+                __set_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags);
+                break;
+        }
+
         return 0;
 }
 EXPORT_SYMBOL_GPL(rt2800_probe_hw_mode);
diff --git a/drivers/net/wireless/rt2x00/rt2800lib.h b/drivers/net/wireless/rt2x00/rt2800lib.h
index 8c3c281904fe..419e36cb06be 100644
--- a/drivers/net/wireless/rt2x00/rt2800lib.h
+++ b/drivers/net/wireless/rt2x00/rt2800lib.h
@@ -184,6 +184,7 @@ void rt2800_reset_tuner(struct rt2x00_dev *rt2x00dev, struct link_qual *qual);
 void rt2800_link_tuner(struct rt2x00_dev *rt2x00dev, struct link_qual *qual,
                        const u32 count);
 void rt2800_gain_calibration(struct rt2x00_dev *rt2x00dev);
+void rt2800_vco_calibration(struct rt2x00_dev *rt2x00dev);
 
 int rt2800_enable_radio(struct rt2x00_dev *rt2x00dev);
 void rt2800_disable_radio(struct rt2x00_dev *rt2x00dev);
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 6ad692914ee9..fc9acc299b10 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -1050,6 +1050,7 @@ static const struct rt2x00lib_ops rt2800pci_rt2x00_ops = {
         .reset_tuner            = rt2800_reset_tuner,
         .link_tuner             = rt2800_link_tuner,
         .gain_calibration       = rt2800_gain_calibration,
+        .vco_calibration        = rt2800_vco_calibration,
         .start_queue            = rt2800pci_start_queue,
         .kick_queue             = rt2800pci_kick_queue,
         .stop_queue             = rt2800pci_stop_queue,
diff --git a/drivers/net/wireless/rt2x00/rt2800usb.c b/drivers/net/wireless/rt2x00/rt2800usb.c
index 0074c4e18d29..f997f0056d7f 100644
--- a/drivers/net/wireless/rt2x00/rt2800usb.c
+++ b/drivers/net/wireless/rt2x00/rt2800usb.c
@@ -781,6 +781,7 @@ static const struct rt2x00lib_ops rt2800usb_rt2x00_ops = {
         .reset_tuner            = rt2800_reset_tuner,
         .link_tuner             = rt2800_link_tuner,
         .gain_calibration       = rt2800_gain_calibration,
+        .vco_calibration        = rt2800_vco_calibration,
         .watchdog               = rt2800usb_watchdog,
         .start_queue            = rt2800usb_start_queue,
         .kick_queue             = rt2x00usb_kick_queue,
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index ed2ae6efcaa3..1906a94e448f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -355,6 +355,11 @@ struct link {
          * Work structure for scheduling periodic AGC adjustments.
          */
         struct delayed_work agc_work;
+
+        /*
+         * Work structure for scheduling periodic VCO calibration.
+         */
+        struct delayed_work vco_work;
 };
 
 enum rt2x00_delayed_flags {
@@ -579,6 +584,7 @@ struct rt2x00lib_ops {
         void (*link_tuner) (struct rt2x00_dev *rt2x00dev,
                             struct link_qual *qual, const u32 count);
         void (*gain_calibration) (struct rt2x00_dev *rt2x00dev);
+        void (*vco_calibration) (struct rt2x00_dev *rt2x00dev);
 
         /*
          * Data queue handlers.
@@ -722,6 +728,7 @@ enum rt2x00_capability_flags {
         CAPABILITY_EXTERNAL_LNA_BG,
         CAPABILITY_DOUBLE_ANTENNA,
         CAPABILITY_BT_COEXIST,
+        CAPABILITY_VCO_RECALIBRATION,
 };
 
 /*
@@ -978,6 +985,11 @@ struct rt2x00_dev {
         struct tasklet_struct autowake_tasklet;
 
         /*
+         * Used for VCO periodic calibration.
+         */
+        int rf_channel;
+
+        /*
          * Protect the interrupt mask register.
          */
         spinlock_t irqmask_lock;
diff --git a/drivers/net/wireless/rt2x00/rt2x00config.c b/drivers/net/wireless/rt2x00/rt2x00config.c
index b704e5b183d0..d7c0f86c9e43 100644
--- a/drivers/net/wireless/rt2x00/rt2x00config.c
+++ b/drivers/net/wireless/rt2x00/rt2x00config.c
@@ -232,6 +232,9 @@ void rt2x00lib_config(struct rt2x00_dev *rt2x00dev,
                 memcpy(&libconf.channel,
                        &rt2x00dev->spec.channels_info[hw_value],
                        sizeof(libconf.channel));
+
+                /* Used for VCO periodic calibration */
+                rt2x00dev->rf_channel = libconf.rf.channel;
         }
 
         if (test_bit(REQUIRE_PS_AUTOWAKE, &rt2x00dev->cap_flags) &&
diff --git a/drivers/net/wireless/rt2x00/rt2x00dev.c b/drivers/net/wireless/rt2x00/rt2x00dev.c
index bae5b01299ea..dfe485a872f6 100644
--- a/drivers/net/wireless/rt2x00/rt2x00dev.c
+++ b/drivers/net/wireless/rt2x00/rt2x00dev.c
@@ -88,6 +88,8 @@ int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
         rt2x00queue_start_queues(rt2x00dev);
         rt2x00link_start_tuner(rt2x00dev);
         rt2x00link_start_agc(rt2x00dev);
+        if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
+                rt2x00link_start_vcocal(rt2x00dev);
 
         /*
          * Start watchdog monitoring.
@@ -111,6 +113,8 @@ void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
          * Stop all queues
          */
         rt2x00link_stop_agc(rt2x00dev);
+        if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
+                rt2x00link_stop_vcocal(rt2x00dev);
         rt2x00link_stop_tuner(rt2x00dev);
         rt2x00queue_stop_queues(rt2x00dev);
         rt2x00queue_flush_queues(rt2x00dev, true);
diff --git a/drivers/net/wireless/rt2x00/rt2x00lib.h b/drivers/net/wireless/rt2x00/rt2x00lib.h
index 4cdf247a870d..78bd43b8961f 100644
--- a/drivers/net/wireless/rt2x00/rt2x00lib.h
+++ b/drivers/net/wireless/rt2x00/rt2x00lib.h
@@ -33,6 +33,7 @@
 #define WATCHDOG_INTERVAL       round_jiffies_relative(HZ)
 #define LINK_TUNE_INTERVAL      round_jiffies_relative(HZ)
 #define AGC_INTERVAL            round_jiffies_relative(4 * HZ)
+#define VCO_INTERVAL            round_jiffies_relative(10 * HZ) /* 10 sec */
 
 /*
  * rt2x00_rate: Per rate device information
@@ -278,12 +279,24 @@ void rt2x00link_stop_watchdog(struct rt2x00_dev *rt2x00dev);
 void rt2x00link_start_agc(struct rt2x00_dev *rt2x00dev);
 
 /**
+ * rt2x00link_start_vcocal - Start periodic VCO calibration
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ */
+void rt2x00link_start_vcocal(struct rt2x00_dev *rt2x00dev);
+
+/**
  * rt2x00link_stop_agc - Stop periodic gain calibration
  * @rt2x00dev: Pointer to &struct rt2x00_dev.
  */
 void rt2x00link_stop_agc(struct rt2x00_dev *rt2x00dev);
 
 /**
+ * rt2x00link_stop_vcocal - Stop periodic VCO calibration
+ * @rt2x00dev: Pointer to &struct rt2x00_dev.
+ */
+void rt2x00link_stop_vcocal(struct rt2x00_dev *rt2x00dev);
+
+/**
  * rt2x00link_register - Initialize link tuning & watchdog functionality
  * @rt2x00dev: Pointer to &struct rt2x00_dev.
  *
diff --git a/drivers/net/wireless/rt2x00/rt2x00link.c b/drivers/net/wireless/rt2x00/rt2x00link.c
index ea10b0068f82..8368aab86f28 100644
--- a/drivers/net/wireless/rt2x00/rt2x00link.c
+++ b/drivers/net/wireless/rt2x00/rt2x00link.c
@@ -447,11 +447,27 @@ void rt2x00link_start_agc(struct rt2x00_dev *rt2x00dev)
                                              AGC_INTERVAL);
 }
 
+void rt2x00link_start_vcocal(struct rt2x00_dev *rt2x00dev)
+{
+        struct link *link = &rt2x00dev->link;
+
+        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) &&
+            rt2x00dev->ops->lib->vco_calibration)
+                ieee80211_queue_delayed_work(rt2x00dev->hw,
+                                             &link->vco_work,
+                                             VCO_INTERVAL);
+}
+
 void rt2x00link_stop_agc(struct rt2x00_dev *rt2x00dev)
 {
         cancel_delayed_work_sync(&rt2x00dev->link.agc_work);
 }
 
+void rt2x00link_stop_vcocal(struct rt2x00_dev *rt2x00dev)
+{
+        cancel_delayed_work_sync(&rt2x00dev->link.vco_work);
+}
+
 static void rt2x00link_agc(struct work_struct *work)
 {
         struct rt2x00_dev *rt2x00dev =
@@ -473,9 +489,32 @@ static void rt2x00link_agc(struct work_struct *work)
                                              AGC_INTERVAL);
 }
 
+static void rt2x00link_vcocal(struct work_struct *work)
+{
+        struct rt2x00_dev *rt2x00dev =
+            container_of(work, struct rt2x00_dev, link.vco_work.work);
+        struct link *link = &rt2x00dev->link;
+
+        /*
+         * When the radio is shutting down we should
+         * immediately cease the VCO calibration.
+         */
+        if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
+                return;
+
+        rt2x00dev->ops->lib->vco_calibration(rt2x00dev);
+
+        if (test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+                ieee80211_queue_delayed_work(rt2x00dev->hw,
+                                             &link->vco_work,
+                                             VCO_INTERVAL);
+}
+
 void rt2x00link_register(struct rt2x00_dev *rt2x00dev)
 {
         INIT_DELAYED_WORK(&rt2x00dev->link.agc_work, rt2x00link_agc);
+        if (test_bit(CAPABILITY_VCO_RECALIBRATION, &rt2x00dev->cap_flags))
+                INIT_DELAYED_WORK(&rt2x00dev->link.vco_work, rt2x00link_vcocal);
         INIT_DELAYED_WORK(&rt2x00dev->link.watchdog_work, rt2x00link_watchdog);
         INIT_DELAYED_WORK(&rt2x00dev->link.work, rt2x00link_tuner);
 }