can: c_can: Cleanup irq enable/disable

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 5d43c5a..562faef 100644 (file)
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -60,6 +60,8 @@
 #define CONTROL_IE             BIT(1)
 #define CONTROL_INIT           BIT(0)
 
+#define CONTROL_IRQMSK         (CONTROL_EIE | CONTROL_IE | CONTROL_SIE)
+
 /* test register */
 #define TEST_RX                        BIT(7)
 #define TEST_TX1               BIT(6)
@@ -146,13 +148,6 @@
 #define IF_RX                  0
 #define IF_TX                  1
 
-/* status interrupt */
-#define STATUS_INTERRUPT       0x8000
-
-/* global interrupt masks */
-#define ENABLE_ALL_INTERRUPTS  1
-#define DISABLE_ALL_INTERRUPTS 0
-
 /* minimum timeout for checking BUSY status */
 #define MIN_TIMEOUT_VALUE      6
 
@@ -246,18 +241,14 @@ static u32 c_can_read_reg32(struct c_can_priv *priv, enum reg index)
        return val;
 }
 
-static void c_can_enable_all_interrupts(struct c_can_priv *priv,
-                                               int enable)
+static void c_can_irq_control(struct c_can_priv *priv, bool enable)
 {
-       unsigned int cntrl_save = priv->read_reg(priv,
-                                               C_CAN_CTRL_REG);
+       u32 ctrl = priv->read_reg(priv, C_CAN_CTRL_REG) & ~CONTROL_IRQMSK;
 
        if (enable)
-               cntrl_save |= (CONTROL_SIE | CONTROL_EIE | CONTROL_IE);
-       else
-               cntrl_save &= ~(CONTROL_EIE | CONTROL_IE | CONTROL_SIE);
+               ctrl |= CONTROL_IRQMSK;
 
-       priv->write_reg(priv, C_CAN_CTRL_REG, cntrl_save);
+       priv->write_reg(priv, C_CAN_CTRL_REG, ctrl);
 }
 
 static inline int c_can_msg_obj_is_busy(struct c_can_priv *priv, int iface)
@@ -664,10 +655,7 @@ static void c_can_stop(struct net_device *dev)
 {
        struct c_can_priv *priv = netdev_priv(dev);
 
-       /* disable all interrupts */
-       c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
-
-       /* set the state as STOPPED */
+       c_can_irq_control(priv, false);
        priv->can.state = CAN_STATE_STOPPED;
 }
 
@@ -682,8 +670,7 @@ static int c_can_set_mode(struct net_device *dev, enum can_mode mode)
                if (err)
                        return err;
                netif_wake_queue(dev);
-               /* enable status change, error and module interrupts */
-               c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+               c_can_irq_control(priv, true);
                break;
        default:
                return -EOPNOTSUPP;
@@ -1144,7 +1131,7 @@ end:
                napi_complete(napi);
                /* enable all IRQs if we are not in bus off state */
                if (priv->can.state != CAN_STATE_BUS_OFF)
-                       c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+                       c_can_irq_control(priv, true);
        }
 
        return work_done;
@@ -1159,7 +1146,7 @@ static irqreturn_t c_can_isr(int irq, void *dev_id)
                return IRQ_NONE;
 
        /* disable all interrupts and schedule the NAPI */
-       c_can_enable_all_interrupts(priv, DISABLE_ALL_INTERRUPTS);
+       c_can_irq_control(priv, false);
        napi_schedule(&priv->napi);
 
        return IRQ_HANDLED;
@@ -1197,7 +1184,7 @@ static int c_can_open(struct net_device *dev)
 
        napi_enable(&priv->napi);
        /* enable status change, error and module interrupts */
-       c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+       c_can_irq_control(priv, true);
        netif_start_queue(dev);
 
        return 0;
@@ -1324,7 +1311,7 @@ int c_can_power_up(struct net_device *dev)
 
        ret = c_can_start(dev);
        if (!ret)
-               c_can_enable_all_interrupts(priv, ENABLE_ALL_INTERRUPTS);
+               c_can_irq_control(priv, true);
 
        return ret;
 }