* [PATCH v3 1/3] mailbox: sprd: Introduce refcnt when clients requests/free channels
2021-03-19 6:15 [PATCH v3 0/3] Fixes & a new supplementary feature to SPRD mailbox driver Orson Zhai
@ 2021-03-19 6:15 ` Orson Zhai
2021-03-19 6:15 ` [PATCH v3 2/3] dt-bindings: mailbox: Add interrupt-names to SPRD mailbox Orson Zhai
2021-03-19 6:15 ` [PATCH v3 3/3] mailbox: sprd: Add supplementary inbox support Orson Zhai
2 siblings, 0 replies; 5+ messages in thread
From: Orson Zhai @ 2021-03-19 6:15 UTC (permalink / raw)
To: Rob Herring, Baolin Wang, Jassi Brar, Chunyan Zhang
Cc: Mark Brown, devicetree, linux-kernel, haidong.yao, Orson Zhai
From: Orson Zhai <orson.zhai@unisoc.com>
Unisoc mailbox has no way to be enabled/disabled for any single channel.
They can only be set to startup or shutdown as a whole device at same time.
Add a variable to count references to avoid mailbox FIFO being reset
unexpectedly when clients are requesting or freeing channels.
Also add a lock to dismiss possible conflicts from register r/w in
different startup or shutdown threads. And fix the crash problem when early
interrupts come from channel which has not been requested by client yet.
Fixes: ca27fc26cd22 ("mailbox: sprd: Add Spreadtrum mailbox driver")
Signed-off-by: Orson Zhai <orson.zhai@unisoc.com>
Reviewed-by: Baolin Wang <baolin.wang7@gmail.com>
---
drivers/mailbox/sprd-mailbox.c | 43 ++++++++++++++++++++++++++++--------------
1 file changed, 29 insertions(+), 14 deletions(-)
diff --git a/drivers/mailbox/sprd-mailbox.c b/drivers/mailbox/sprd-mailbox.c
index 4c32530..94d9067d 100644
--- a/drivers/mailbox/sprd-mailbox.c
+++ b/drivers/mailbox/sprd-mailbox.c
@@ -60,6 +60,8 @@ struct sprd_mbox_priv {
struct clk *clk;
u32 outbox_fifo_depth;
+ struct mutex lock;
+ u32 refcnt;
struct mbox_chan chan[SPRD_MBOX_CHAN_MAX];
};
@@ -115,7 +117,11 @@ static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
id = readl(priv->outbox_base + SPRD_MBOX_ID);
chan = &priv->chan[id];
- mbox_chan_received_data(chan, (void *)msg);
+ if (chan->cl)
+ mbox_chan_received_data(chan, (void *)msg);
+ else
+ dev_warn_ratelimited(priv->dev,
+ "message's been dropped at ch[%d]\n", id);
/* Trigger to update outbox FIFO pointer */
writel(0x1, priv->outbox_base + SPRD_MBOX_TRIGGER);
@@ -215,18 +221,22 @@ static int sprd_mbox_startup(struct mbox_chan *chan)
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
u32 val;
- /* Select outbox FIFO mode and reset the outbox FIFO status */
- writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);
+ mutex_lock(&priv->lock);
+ if (priv->refcnt++ == 0) {
+ /* Select outbox FIFO mode and reset the outbox FIFO status */
+ writel(0x0, priv->outbox_base + SPRD_MBOX_FIFO_RST);
- /* Enable inbox FIFO overflow and delivery interrupt */
- val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);
- val &= ~(SPRD_INBOX_FIFO_OVERFLOW_IRQ | SPRD_INBOX_FIFO_DELIVER_IRQ);
- writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+ /* Enable inbox FIFO overflow and delivery interrupt */
+ val = readl(priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+ val &= ~(SPRD_INBOX_FIFO_OVERFLOW_IRQ | SPRD_INBOX_FIFO_DELIVER_IRQ);
+ writel(val, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
- /* Enable outbox FIFO not empty interrupt */
- val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);
- val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
- writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+ /* Enable outbox FIFO not empty interrupt */
+ val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+ val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
+ writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+ }
+ mutex_unlock(&priv->lock);
return 0;
}
@@ -235,9 +245,13 @@ static void sprd_mbox_shutdown(struct mbox_chan *chan)
{
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
- /* Disable inbox & outbox interrupt */
- writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
- writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+ mutex_lock(&priv->lock);
+ if (--priv->refcnt == 0) {
+ /* Disable inbox & outbox interrupt */
+ writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
+ writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+ }
+ mutex_unlock(&priv->lock);
}
static const struct mbox_chan_ops sprd_mbox_ops = {
@@ -266,6 +280,7 @@ static int sprd_mbox_probe(struct platform_device *pdev)
return -ENOMEM;
priv->dev = dev;
+ mutex_init(&priv->lock);
/*
* The Spreadtrum mailbox uses an inbox to send messages to the target
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v3 3/3] mailbox: sprd: Add supplementary inbox support
2021-03-19 6:15 [PATCH v3 0/3] Fixes & a new supplementary feature to SPRD mailbox driver Orson Zhai
2021-03-19 6:15 ` [PATCH v3 1/3] mailbox: sprd: Introduce refcnt when clients requests/free channels Orson Zhai
2021-03-19 6:15 ` [PATCH v3 2/3] dt-bindings: mailbox: Add interrupt-names to SPRD mailbox Orson Zhai
@ 2021-03-19 6:15 ` Orson Zhai
2 siblings, 0 replies; 5+ messages in thread
From: Orson Zhai @ 2021-03-19 6:15 UTC (permalink / raw)
To: Rob Herring, Baolin Wang, Jassi Brar, Chunyan Zhang
Cc: Mark Brown, devicetree, linux-kernel, haidong.yao, Orson Zhai
From: Orson Zhai <orson.zhai@unisoc.com>
Some sensors connected to Unisoc mailbox will send data very frequently.
This makes channel 0 very busy and the messages from other remote cores
not able to be handled as soon as possible.
It's a trick (un-documented) from Unisoc ASIC designers to resolve this
special requirement that an inbox assigned to one of the remote cores
before was modified to be exposed to host cpu core.
Then from host side, a supplementary inbox is added for transferring mass
but not emergency messages from the remote cores, such as step counting
sensor, with an independent FIFO and interrupt which is as same as channel
0. Meanwihle, inbox part of this channel is still kept for original remote
core to use.
Signed-off-by: Orson Zhai <orson.zhai@unisoc.com>
Reviewed-by: Baolin Wang <baolin.wang7@gmail.com>
---
drivers/mailbox/sprd-mailbox.c | 88 ++++++++++++++++++++++++++++++++++--------
1 file changed, 71 insertions(+), 17 deletions(-)
diff --git a/drivers/mailbox/sprd-mailbox.c b/drivers/mailbox/sprd-mailbox.c
index 94d9067d..0a1449d 100644
--- a/drivers/mailbox/sprd-mailbox.c
+++ b/drivers/mailbox/sprd-mailbox.c
@@ -11,6 +11,7 @@
#include <linux/io.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
@@ -50,13 +51,17 @@
#define SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ BIT(0)
#define SPRD_OUTBOX_FIFO_IRQ_MASK GENMASK(4, 0)
+#define SPRD_OUTBOX_BASE_SPAN 0x1000
#define SPRD_MBOX_CHAN_MAX 8
+#define SPRD_SUPP_INBOX_ID_SC9863A 7
struct sprd_mbox_priv {
struct mbox_controller mbox;
struct device *dev;
void __iomem *inbox_base;
void __iomem *outbox_base;
+ /* Base register address for supplementary outbox */
+ void __iomem *supp_base;
struct clk *clk;
u32 outbox_fifo_depth;
@@ -96,14 +101,13 @@ static u32 sprd_mbox_get_fifo_len(struct sprd_mbox_priv *priv, u32 fifo_sts)
return fifo_len;
}
-static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
+static irqreturn_t do_outbox_isr(void __iomem *base, struct sprd_mbox_priv *priv)
{
- struct sprd_mbox_priv *priv = data;
struct mbox_chan *chan;
u32 fifo_sts, fifo_len, msg[2];
int i, id;
- fifo_sts = readl(priv->outbox_base + SPRD_MBOX_FIFO_STS);
+ fifo_sts = readl(base + SPRD_MBOX_FIFO_STS);
fifo_len = sprd_mbox_get_fifo_len(priv, fifo_sts);
if (!fifo_len) {
@@ -112,9 +116,9 @@ static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
}
for (i = 0; i < fifo_len; i++) {
- msg[0] = readl(priv->outbox_base + SPRD_MBOX_MSG_LOW);
- msg[1] = readl(priv->outbox_base + SPRD_MBOX_MSG_HIGH);
- id = readl(priv->outbox_base + SPRD_MBOX_ID);
+ msg[0] = readl(base + SPRD_MBOX_MSG_LOW);
+ msg[1] = readl(base + SPRD_MBOX_MSG_HIGH);
+ id = readl(base + SPRD_MBOX_ID);
chan = &priv->chan[id];
if (chan->cl)
@@ -124,15 +128,29 @@ static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
"message's been dropped at ch[%d]\n", id);
/* Trigger to update outbox FIFO pointer */
- writel(0x1, priv->outbox_base + SPRD_MBOX_TRIGGER);
+ writel(0x1, base + SPRD_MBOX_TRIGGER);
}
/* Clear irq status after reading all message. */
- writel(SPRD_MBOX_IRQ_CLR, priv->outbox_base + SPRD_MBOX_IRQ_STS);
+ writel(SPRD_MBOX_IRQ_CLR, base + SPRD_MBOX_IRQ_STS);
return IRQ_HANDLED;
}
+static irqreturn_t sprd_mbox_outbox_isr(int irq, void *data)
+{
+ struct sprd_mbox_priv *priv = data;
+
+ return do_outbox_isr(priv->outbox_base, priv);
+}
+
+static irqreturn_t sprd_mbox_supp_isr(int irq, void *data)
+{
+ struct sprd_mbox_priv *priv = data;
+
+ return do_outbox_isr(priv->supp_base, priv);
+}
+
static irqreturn_t sprd_mbox_inbox_isr(int irq, void *data)
{
struct sprd_mbox_priv *priv = data;
@@ -235,6 +253,14 @@ static int sprd_mbox_startup(struct mbox_chan *chan)
val = readl(priv->outbox_base + SPRD_MBOX_IRQ_MSK);
val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
writel(val, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+
+ /* Enable supplementary outbox as the fundamental one */
+ if (priv->supp_base) {
+ writel(0x0, priv->supp_base + SPRD_MBOX_FIFO_RST);
+ val = readl(priv->supp_base + SPRD_MBOX_IRQ_MSK);
+ val &= ~SPRD_OUTBOX_FIFO_NOT_EMPTY_IRQ;
+ writel(val, priv->supp_base + SPRD_MBOX_IRQ_MSK);
+ }
}
mutex_unlock(&priv->lock);
@@ -250,6 +276,10 @@ static void sprd_mbox_shutdown(struct mbox_chan *chan)
/* Disable inbox & outbox interrupt */
writel(SPRD_INBOX_FIFO_IRQ_MASK, priv->inbox_base + SPRD_MBOX_IRQ_MSK);
writel(SPRD_OUTBOX_FIFO_IRQ_MASK, priv->outbox_base + SPRD_MBOX_IRQ_MSK);
+
+ if (priv->supp_base)
+ writel(SPRD_OUTBOX_FIFO_IRQ_MASK,
+ priv->supp_base + SPRD_MBOX_IRQ_MSK);
}
mutex_unlock(&priv->lock);
}
@@ -272,8 +302,8 @@ static int sprd_mbox_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sprd_mbox_priv *priv;
- int ret, inbox_irq, outbox_irq;
- unsigned long id;
+ int ret, inbox_irq, outbox_irq, supp_irq;
+ unsigned long id, supp;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -283,11 +313,15 @@ static int sprd_mbox_probe(struct platform_device *pdev)
mutex_init(&priv->lock);
/*
- * The Spreadtrum mailbox uses an inbox to send messages to the target
- * core, and uses an outbox to receive messages from other cores.
+ * Unisoc mailbox uses an inbox to send messages to the target
+ * core, and uses (an) outbox(es) to receive messages from other
+ * cores.
+ *
+ * Thus in general the mailbox controller supplies 2 different
+ * register addresses and IRQ numbers for inbox and outbox.
*
- * Thus the mailbox controller supplies 2 different register addresses
- * and IRQ numbers for inbox and outbox.
+ * If necessary, a supplementary inbox could be enabled optionally
+ * with an independent FIFO and an extra interrupt.
*/
priv->inbox_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->inbox_base))
@@ -313,7 +347,7 @@ static int sprd_mbox_probe(struct platform_device *pdev)
return ret;
}
- inbox_irq = platform_get_irq(pdev, 0);
+ inbox_irq = platform_get_irq_byname(pdev, "inbox");
if (inbox_irq < 0)
return inbox_irq;
@@ -324,7 +358,7 @@ static int sprd_mbox_probe(struct platform_device *pdev)
return ret;
}
- outbox_irq = platform_get_irq(pdev, 1);
+ outbox_irq = platform_get_irq_byname(pdev, "outbox");
if (outbox_irq < 0)
return outbox_irq;
@@ -335,6 +369,24 @@ static int sprd_mbox_probe(struct platform_device *pdev)
return ret;
}
+ /* Supplementary outbox IRQ is optional */
+ supp_irq = platform_get_irq_byname(pdev, "supp-outbox");
+ if (supp_irq > 0) {
+ ret = devm_request_irq(dev, supp_irq, sprd_mbox_supp_isr,
+ IRQF_NO_SUSPEND, dev_name(dev), priv);
+ if (ret) {
+ dev_err(dev, "failed to request outbox IRQ: %d\n", ret);
+ return ret;
+ }
+
+ supp = (unsigned long) of_device_get_match_data(dev);
+ if (!supp) {
+ dev_err(dev, "no supplementary outbox specified\n");
+ return -ENODEV;
+ }
+ priv->supp_base = priv->outbox_base + (SPRD_OUTBOX_BASE_SPAN * supp);
+ }
+
/* Get the default outbox FIFO depth */
priv->outbox_fifo_depth =
readl(priv->outbox_base + SPRD_MBOX_FIFO_DEPTH) + 1;
@@ -357,7 +409,9 @@ static int sprd_mbox_probe(struct platform_device *pdev)
}
static const struct of_device_id sprd_mbox_of_match[] = {
- { .compatible = "sprd,sc9860-mailbox", },
+ { .compatible = "sprd,sc9860-mailbox" },
+ { .compatible = "sprd,sc9863a-mailbox",
+ .data = (void *)SPRD_SUPP_INBOX_ID_SC9863A },
{ },
};
MODULE_DEVICE_TABLE(of, sprd_mbox_of_match);
--
2.7.4
^ permalink raw reply related [flat|nested] 5+ messages in thread