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authorThomas Gleixner <tglx@linutronix.de>2014-03-18 17:19:08 (GMT)
committerMarc Kleine-Budde <mkl@pengutronix.de>2014-04-01 09:54:57 (GMT)
commit5bb9cbaa622a2bbde8e307d4e0528dd2c8212a6a (patch)
treeafab304c5344009f73aa931cd1f4ec19382105d4
parent9fac1d1ab8e66816c40a235a238357b1f1fc4dee (diff)
downloadlinux-5bb9cbaa622a2bbde8e307d4e0528dd2c8212a6a.tar.xz
can: c_can: Fix hardware raminit function
The function is broken in several ways: - The function does not wait for the init to complete. That can take quite some microseconds. - No protection against being called for two chips at the same time. SMP is such a new thing, right? Clear the start and the init done bit unconditionally and wait for both bits to be clear. In the enable path set the init bit and wait for the init done bit. Add proper locking. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
-rw-r--r--drivers/net/can/c_can/c_can_platform.c47
1 files changed, 37 insertions, 10 deletions
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index d66ac26..806d927 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -37,8 +37,10 @@
#include "c_can.h"
-#define CAN_RAMINIT_START_MASK(i) (1 << (i))
-
+#define CAN_RAMINIT_START_MASK(i) (0x001 << (i))
+#define CAN_RAMINIT_DONE_MASK(i) (0x100 << (i))
+#define CAN_RAMINIT_ALL_MASK(i) (0x101 << (i))
+static DEFINE_SPINLOCK(raminit_lock);
/*
* 16-bit c_can registers can be arranged differently in the memory
* architecture of different implementations. For example: 16-bit
@@ -69,16 +71,41 @@ static void c_can_plat_write_reg_aligned_to_32bit(struct c_can_priv *priv,
writew(val, priv->base + 2 * priv->regs[index]);
}
+static void c_can_hw_raminit_wait(const struct c_can_priv *priv, u32 mask,
+ u32 val)
+{
+ /* We look only at the bits of our instance. */
+ val &= mask;
+ while ((readl(priv->raminit_ctrlreg) & mask) != val)
+ udelay(1);
+}
+
static void c_can_hw_raminit(const struct c_can_priv *priv, bool enable)
{
- u32 val;
-
- val = readl(priv->raminit_ctrlreg);
- if (enable)
- val |= CAN_RAMINIT_START_MASK(priv->instance);
- else
- val &= ~CAN_RAMINIT_START_MASK(priv->instance);
- writel(val, priv->raminit_ctrlreg);
+ u32 mask = CAN_RAMINIT_ALL_MASK(priv->instance);
+ u32 ctrl;
+
+ spin_lock(&raminit_lock);
+
+ ctrl = readl(priv->raminit_ctrlreg);
+ /* We clear the done and start bit first. The start bit is
+ * looking at the 0 -> transition, but is not self clearing;
+ * And we clear the init done bit as well.
+ */
+ ctrl &= ~CAN_RAMINIT_START_MASK(priv->instance);
+ ctrl |= CAN_RAMINIT_DONE_MASK(priv->instance);
+ writel(ctrl, priv->raminit_ctrlreg);
+ ctrl &= ~CAN_RAMINIT_DONE_MASK(priv->instance);
+ c_can_hw_raminit_wait(priv, ctrl, mask);
+
+ if (enable) {
+ /* Set start bit and wait for the done bit. */
+ ctrl |= CAN_RAMINIT_START_MASK(priv->instance);
+ writel(ctrl, priv->raminit_ctrlreg);
+ ctrl |= CAN_RAMINIT_DONE_MASK(priv->instance);
+ c_can_hw_raminit_wait(priv, ctrl, mask);
+ }
+ spin_unlock(&raminit_lock);
}
static struct platform_device_id c_can_id_table[] = {