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Subject[PATCH V6 2/4] mailbox: imx: restructure code to make easy for new MU
Date
From: Peng Fan <peng.fan@nxp.com>

Add imx_mu_generic_tx for data send and imx_mu_generic_rx for interrupt
data receive.

Pack original mu chans related code into imx_mu_init_generic

Add tx/rx/init hooks into imx_mu_dcfg

With these, it will be a bit easy to introduce i.MX8/8X SCU type
MU dedicated to communicate with SCU.

Reviewed-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

V6:
Add R-b tag
V5:
imx_mu_dcfg moved to below imx_mu_priv
Add init hooks
V4:
Pack MU chans init to imx_mu_init_generic
V3:
New patch, restructure code.

drivers/mailbox/imx-mailbox.c | 137 +++++++++++++++++++++++++-----------------
1 file changed, 83 insertions(+), 54 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index 2cdcdc5f1119..df6c4ecd913c 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -36,13 +36,6 @@ enum imx_mu_chan_type {
IMX_MU_TYPE_RXDB, /* Rx doorbell */
};

-struct imx_mu_dcfg {
- u32 xTR[4]; /* Transmit Registers */
- u32 xRR[4]; /* Receive Registers */
- u32 xSR; /* Status Register */
- u32 xCR; /* Control Register */
-};
-
struct imx_mu_con_priv {
unsigned int idx;
char irq_desc[IMX_MU_CHAN_NAME_SIZE];
@@ -67,18 +60,14 @@ struct imx_mu_priv {
bool side_b;
};

-static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
- .xTR = {0x0, 0x4, 0x8, 0xc},
- .xRR = {0x10, 0x14, 0x18, 0x1c},
- .xSR = 0x20,
- .xCR = 0x24,
-};
-
-static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
- .xTR = {0x20, 0x24, 0x28, 0x2c},
- .xRR = {0x40, 0x44, 0x48, 0x4c},
- .xSR = 0x60,
- .xCR = 0x64,
+struct imx_mu_dcfg {
+ int (*tx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data);
+ int (*rx)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
+ void (*init)(struct imx_mu_priv *priv);
+ u32 xTR[4]; /* Transmit Registers */
+ u32 xRR[4]; /* Receive Registers */
+ u32 xSR; /* Status Register */
+ u32 xCR; /* Control Register */
};

static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
@@ -111,6 +100,40 @@ static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, u32 set, u32 clr)
return val;
}

+static int imx_mu_generic_tx(struct imx_mu_priv *priv,
+ struct imx_mu_con_priv *cp,
+ void *data)
+{
+ u32 *arg = data;
+
+ switch (cp->type) {
+ case IMX_MU_TYPE_TX:
+ imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
+ imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
+ break;
+ case IMX_MU_TYPE_TXDB:
+ imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
+ tasklet_schedule(&cp->txdb_tasklet);
+ break;
+ default:
+ dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int imx_mu_generic_rx(struct imx_mu_priv *priv,
+ struct imx_mu_con_priv *cp)
+{
+ u32 dat;
+
+ dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
+ mbox_chan_received_data(cp->chan, (void *)&dat);
+
+ return 0;
+}
+
static void imx_mu_txdb_tasklet(unsigned long data)
{
struct imx_mu_con_priv *cp = (struct imx_mu_con_priv *)data;
@@ -123,7 +146,7 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
struct mbox_chan *chan = p;
struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
struct imx_mu_con_priv *cp = chan->con_priv;
- u32 val, ctrl, dat;
+ u32 val, ctrl;

ctrl = imx_mu_read(priv, priv->dcfg->xCR);
val = imx_mu_read(priv, priv->dcfg->xSR);
@@ -152,8 +175,7 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
imx_mu_xcr_rmw(priv, 0, IMX_MU_xCR_TIEn(cp->idx));
mbox_chan_txdone(chan, 0);
} else if (val == IMX_MU_xSR_RFn(cp->idx)) {
- dat = imx_mu_read(priv, priv->dcfg->xRR[cp->idx]);
- mbox_chan_received_data(chan, (void *)&dat);
+ priv->dcfg->rx(priv, cp);
} else if (val == IMX_MU_xSR_GIPn(cp->idx)) {
imx_mu_write(priv, IMX_MU_xSR_GIPn(cp->idx), priv->dcfg->xSR);
mbox_chan_received_data(chan, NULL);
@@ -169,23 +191,8 @@ static int imx_mu_send_data(struct mbox_chan *chan, void *data)
{
struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
struct imx_mu_con_priv *cp = chan->con_priv;
- u32 *arg = data;
-
- switch (cp->type) {
- case IMX_MU_TYPE_TX:
- imx_mu_write(priv, *arg, priv->dcfg->xTR[cp->idx]);
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_TIEn(cp->idx), 0);
- break;
- case IMX_MU_TYPE_TXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_xCR_GIRn(cp->idx), 0);
- tasklet_schedule(&cp->txdb_tasklet);
- break;
- default:
- dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
- return -EINVAL;
- }

- return 0;
+ return priv->dcfg->tx(priv, cp, data);
}

static int imx_mu_startup(struct mbox_chan *chan)
@@ -280,6 +287,22 @@ static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,

static void imx_mu_init_generic(struct imx_mu_priv *priv)
{
+ unsigned int i;
+
+ for (i = 0; i < IMX_MU_CHANS; i++) {
+ struct imx_mu_con_priv *cp = &priv->con_priv[i];
+
+ cp->idx = i % 4;
+ cp->type = i >> 2;
+ cp->chan = &priv->mbox_chans[i];
+ priv->mbox_chans[i].con_priv = cp;
+ snprintf(cp->irq_desc, sizeof(cp->irq_desc),
+ "imx_mu_chan[%i-%i]", cp->type, cp->idx);
+ }
+
+ priv->mbox.num_chans = IMX_MU_CHANS;
+ priv->mbox.of_xlate = imx_mu_xlate;
+
if (priv->side_b)
return;

@@ -293,7 +316,6 @@ static int imx_mu_probe(struct platform_device *pdev)
struct device_node *np = dev->of_node;
struct imx_mu_priv *priv;
const struct imx_mu_dcfg *dcfg;
- unsigned int i;
int ret;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -329,32 +351,19 @@ static int imx_mu_probe(struct platform_device *pdev)
return ret;
}

- for (i = 0; i < IMX_MU_CHANS; i++) {
- struct imx_mu_con_priv *cp = &priv->con_priv[i];
-
- cp->idx = i % 4;
- cp->type = i >> 2;
- cp->chan = &priv->mbox_chans[i];
- priv->mbox_chans[i].con_priv = cp;
- snprintf(cp->irq_desc, sizeof(cp->irq_desc),
- "imx_mu_chan[%i-%i]", cp->type, cp->idx);
- }
-
priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");

+ priv->dcfg->init(priv);
+
spin_lock_init(&priv->xcr_lock);

priv->mbox.dev = dev;
priv->mbox.ops = &imx_mu_ops;
priv->mbox.chans = priv->mbox_chans;
- priv->mbox.num_chans = IMX_MU_CHANS;
- priv->mbox.of_xlate = imx_mu_xlate;
priv->mbox.txdone_irq = true;

platform_set_drvdata(pdev, priv);

- imx_mu_init_generic(priv);
-
return devm_mbox_controller_register(dev, &priv->mbox);
}

@@ -367,6 +376,26 @@ static int imx_mu_remove(struct platform_device *pdev)
return 0;
}

+static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
+ .tx = imx_mu_generic_tx,
+ .rx = imx_mu_generic_rx,
+ .init = imx_mu_init_generic,
+ .xTR = {0x0, 0x4, 0x8, 0xc},
+ .xRR = {0x10, 0x14, 0x18, 0x1c},
+ .xSR = 0x20,
+ .xCR = 0x24,
+};
+
+static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
+ .tx = imx_mu_generic_tx,
+ .rx = imx_mu_generic_rx,
+ .init = imx_mu_init_generic,
+ .xTR = {0x20, 0x24, 0x28, 0x2c},
+ .xRR = {0x40, 0x44, 0x48, 0x4c},
+ .xSR = 0x60,
+ .xCR = 0x64,
+};
+
static const struct of_device_id imx_mu_dt_ids[] = {
{ .compatible = "fsl,imx7ulp-mu", .data = &imx_mu_cfg_imx7ulp },
{ .compatible = "fsl,imx6sx-mu", .data = &imx_mu_cfg_imx6sx },
--
2.16.4
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