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From 2f3587cf9e44f261fe74413ef6a54467686c910b Mon Sep 17 00:00:00 2001
From: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
Date: Tue, 20 Nov 2018 15:49:15 -0800
Subject: [PATCH] Test code for LPC MBOX
Blocked interrupt driven code for test.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
---
drivers/misc/aspeed-lpc-mbox.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/aspeed-lpc-mbox.c b/drivers/misc/aspeed-lpc-mbox.c
index 0f0c711bafee..0933e0553953 100644
--- a/drivers/misc/aspeed-lpc-mbox.c
+++ b/drivers/misc/aspeed-lpc-mbox.c
@@ -19,6 +19,8 @@
#define DEVICE_NAME "aspeed-mbox"
+#define MBX_USE_INTERRUPT 0
+
#define ASPEED_MBOX_NUM_REGS 16
#define ASPEED_MBOX_DATA_0 0x00
@@ -79,12 +81,14 @@ static int aspeed_mbox_open(struct inode *inode, struct file *file)
struct aspeed_mbox *mbox = file_mbox(file);
if (atomic_inc_return(&aspeed_mbox_open_count) == 1) {
+#if MBX_USE_INTERRUPT
/*
* Clear the interrupt status bit if it was left on and unmask
* interrupts.
* ASPEED_MBOX_CTRL_RECV bit is W1C, this also unmasks in 1 step
*/
aspeed_mbox_outb(mbox, ASPEED_MBOX_CTRL_RECV, ASPEED_MBOX_BMC_CTRL);
+#endif
return 0;
}
@@ -106,6 +110,7 @@ static ssize_t aspeed_mbox_read(struct file *file, char __user *buf,
if (count + *ppos > ASPEED_MBOX_NUM_REGS)
return -EINVAL;
+#if MBX_USE_INTERRUPT
if (file->f_flags & O_NONBLOCK) {
if (!(aspeed_mbox_inb(mbox, ASPEED_MBOX_BMC_CTRL) &
ASPEED_MBOX_CTRL_RECV))
@@ -115,6 +120,7 @@ static ssize_t aspeed_mbox_read(struct file *file, char __user *buf,
ASPEED_MBOX_CTRL_RECV)) {
return -ERESTARTSYS;
}
+#endif
mutex_lock(&mbox->mutex);
@@ -129,8 +135,10 @@ static ssize_t aspeed_mbox_read(struct file *file, char __user *buf,
count--;
}
+#if MBX_USE_INTERRUPT
/* ASPEED_MBOX_CTRL_RECV bit is write to clear, this also unmasks in 1 step */
aspeed_mbox_outb(mbox, ASPEED_MBOX_CTRL_RECV, ASPEED_MBOX_BMC_CTRL);
+#endif
ret = p - buf;
out_unlock:
@@ -180,7 +188,9 @@ static unsigned int aspeed_mbox_poll(struct file *file, poll_table *wait)
poll_wait(file, &mbox->queue, wait);
+#if MBX_USE_INTERRUPT
if (aspeed_mbox_inb(mbox, ASPEED_MBOX_BMC_CTRL) & ASPEED_MBOX_CTRL_RECV)
+#endif
mask |= POLLIN;
return mask;
@@ -206,6 +216,7 @@ static irqreturn_t aspeed_mbox_irq(int irq, void *arg)
{
struct aspeed_mbox *mbox = arg;
+#if MBX_USE_INTERRUPT
if (!(aspeed_mbox_inb(mbox, ASPEED_MBOX_BMC_CTRL) & ASPEED_MBOX_CTRL_RECV))
return IRQ_NONE;
@@ -216,6 +227,7 @@ static irqreturn_t aspeed_mbox_irq(int irq, void *arg)
/* Mask it off, we'll clear it when we the data gets read */
aspeed_mbox_outb(mbox, ASPEED_MBOX_CTRL_MASK, ASPEED_MBOX_BMC_CTRL);
+#endif
wake_up(&mbox->queue);
return IRQ_HANDLED;
@@ -248,7 +260,14 @@ static int aspeed_mbox_config_irq(struct aspeed_mbox *mbox,
aspeed_mbox_outb(mbox, 0xff, ASPEED_MBOX_STATUS_0);
aspeed_mbox_outb(mbox, 0xff, ASPEED_MBOX_STATUS_1);
- aspeed_mbox_outb(mbox, ASPEED_MBOX_CTRL_RECV, ASPEED_MBOX_BMC_CTRL);
+ aspeed_mbox_outb(mbox, aspeed_mbox_inb(mbox, ASPEED_MBOX_BMC_CTRL) | ASPEED_MBOX_CTRL_MASK, ASPEED_MBOX_BMC_CTRL);
+
+ /*
+ * Because mailbox data register init value is random, need to give a
+ * init value to mailbox data register.
+ */
+ aspeed_mbox_outb(mbox, 0x00, ASPEED_MBOX_DATA_0);
+
return 0;
}
--
2.7.4
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