[PATCH V2 4/4] mailbox: imx-mailbox: support i.MX8ULP MU

From: Peng Fan (OSS)
Date: Fri May 28 2021 - 05:33:45 EST

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From: Peng Fan <peng.fan@xxxxxxx>

i.MX8ULP MU has different register layout and bit layout compared
with i.MX6SX/7ULP/8.

So add enum imx_mu_type to show it is IMX_MU_V2 or IMX_MU_V1.

For IMX_MU_V2 mu hardware, check it when calculating bit offset to get
the correct offset.

Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
---
drivers/mailbox/imx-mailbox.c | 104 ++++++++++++++++++++--------------
1 file changed, 63 insertions(+), 41 deletions(-)

diff --git a/drivers/mailbox/imx-mailbox.c b/drivers/mailbox/imx-mailbox.c
index f5dadcc827aa..bc51bd3c1999 100644
--- a/drivers/mailbox/imx-mailbox.c
+++ b/drivers/mailbox/imx-mailbox.c
@@ -15,20 +15,6 @@
#include <linux/pm_runtime.h>
#include <linux/slab.h>

-#define IMX_MU_xSR_GIPn(x) BIT(28 + (3 - (x)))
-#define IMX_MU_xSR_RFn(x) BIT(24 + (3 - (x)))
-#define IMX_MU_xSR_TEn(x) BIT(20 + (3 - (x)))
-#define IMX_MU_xSR_BRDIP BIT(9)
-
-/* General Purpose Interrupt Enable */
-#define IMX_MU_xCR_GIEn(x) BIT(28 + (3 - (x)))
-/* Receive Interrupt Enable */
-#define IMX_MU_xCR_RIEn(x) BIT(24 + (3 - (x)))
-/* Transmit Interrupt Enable */
-#define IMX_MU_xCR_TIEn(x) BIT(20 + (3 - (x)))
-/* General Purpose Interrupt Request */
-#define IMX_MU_xCR_GIRn(x) BIT(16 + (3 - (x)))
-
#define IMX_MU_CHANS 16
/* TX0/RX0/RXDB[0-3] */
#define IMX_MU_SCU_CHANS 6
@@ -42,7 +28,7 @@ enum imx_mu_chan_type {
};

enum imx_mu_xcr {
- IMX_MU_CR,
+ IMX_MU_GIER,
IMX_MU_GCR,
IMX_MU_TCR,
IMX_MU_RCR,
@@ -87,16 +73,36 @@ struct imx_mu_priv {
bool side_b;
};

+enum imx_mu_type {
+ IMX_MU_V1,
+ IMX_MU_V2,
+};
+
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);
+ enum imx_mu_type type;
u32 xTR; /* Transmit Register0 */
u32 xRR; /* Receive Register0 */
u32 xSR[4]; /* Status Registers */
u32 xCR[4]; /* Control Registers */
};

+#define IMX_MU_xSR_GIPn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
+#define IMX_MU_xSR_RFn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
+#define IMX_MU_xSR_TEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
+
+/* General Purpose Interrupt Enable */
+#define IMX_MU_xCR_GIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(28 + (3 - (x))))
+/* Receive Interrupt Enable */
+#define IMX_MU_xCR_RIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
+/* Transmit Interrupt Enable */
+#define IMX_MU_xCR_TIEn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(20 + (3 - (x))))
+/* General Purpose Interrupt Request */
+#define IMX_MU_xCR_GIRn(type, x) (type == IMX_MU_V2 ? BIT(x) : BIT(16 + (3 - (x))))
+
+
static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
{
return container_of(mbox, struct imx_mu_priv, mbox);
@@ -136,10 +142,10 @@ static int imx_mu_generic_tx(struct imx_mu_priv *priv,
switch (cp->type) {
case IMX_MU_TYPE_TX:
imx_mu_write(priv, *arg, priv->dcfg->xTR + cp->idx * 4);
- imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(cp->idx), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
break;
case IMX_MU_TYPE_TXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(cp->idx), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
tasklet_schedule(&cp->txdb_tasklet);
break;
default:
@@ -191,7 +197,7 @@ static int imx_mu_scu_tx(struct imx_mu_priv *priv,
for (; i < msg->hdr.size; i++) {
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_TSR],
xsr,
- xsr & IMX_MU_xSR_TEn(i % 4),
+ xsr & IMX_MU_xSR_TEn(priv->dcfg->type, i % 4),
0, 100);
if (ret) {
dev_err(priv->dev, "Send data index: %d timeout\n", i);
@@ -200,7 +206,7 @@ static int imx_mu_scu_tx(struct imx_mu_priv *priv,
imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % 4) * 4);
}

- imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(cp->idx), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_TCR, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx), 0);
break;
default:
dev_warn_ratelimited(priv->dev, "Send data on wrong channel type: %d\n", cp->type);
@@ -218,7 +224,7 @@ static int imx_mu_scu_rx(struct imx_mu_priv *priv,
int i, ret;
u32 xsr;

- imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(0));
+ imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, 0));
*data++ = imx_mu_read(priv, priv->dcfg->xRR);

if (msg.hdr.size > sizeof(msg) / 4) {
@@ -228,7 +234,7 @@ static int imx_mu_scu_rx(struct imx_mu_priv *priv,

for (i = 1; i < msg.hdr.size; i++) {
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_RSR], xsr,
- xsr & IMX_MU_xSR_RFn(i % 4), 0, 100);
+ xsr & IMX_MU_xSR_RFn(priv->dcfg->type, i % 4), 0, 100);
if (ret) {
dev_err(priv->dev, "timeout read idx %d\n", i);
return ret;
@@ -236,7 +242,7 @@ static int imx_mu_scu_rx(struct imx_mu_priv *priv,
*data++ = imx_mu_read(priv, priv->dcfg->xRR + (i % 4) * 4);
}

- imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(0), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);
mbox_chan_received_data(cp->chan, (void *)&msg);

return 0;
@@ -260,20 +266,20 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
case IMX_MU_TYPE_TX:
ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_TCR]);
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_TSR]);
- val &= IMX_MU_xSR_TEn(cp->idx) &
- (ctrl & IMX_MU_xCR_TIEn(cp->idx));
+ val &= IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx) &
+ (ctrl & IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RX:
ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_RCR]);
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
- val &= IMX_MU_xSR_RFn(cp->idx) &
- (ctrl & IMX_MU_xCR_RIEn(cp->idx));
+ val &= IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx) &
+ (ctrl & IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RXDB:
- ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_GCR]);
+ ctrl = imx_mu_read(priv, priv->dcfg->xCR[IMX_MU_GIER]);
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
- val &= IMX_MU_xSR_GIPn(cp->idx) &
- (ctrl & IMX_MU_xCR_GIEn(cp->idx));
+ val &= IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx) &
+ (ctrl & IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
break;
default:
break;
@@ -282,13 +288,17 @@ static irqreturn_t imx_mu_isr(int irq, void *p)
if (!val)
return IRQ_NONE;

- if (val == IMX_MU_xSR_TEn(cp->idx)) {
- imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(cp->idx));
+ if ((val == IMX_MU_xSR_TEn(priv->dcfg->type, cp->idx)) &&
+ (cp->type == IMX_MU_TYPE_TX)) {
+ imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
mbox_chan_txdone(chan, 0);
- } else if (val == IMX_MU_xSR_RFn(cp->idx)) {
+ } else if ((val == IMX_MU_xSR_RFn(priv->dcfg->type, cp->idx)) &&
+ (cp->type == IMX_MU_TYPE_RX)) {
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[IMX_MU_GSR]);
+ } else if ((val == IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx)) &&
+ (cp->type == IMX_MU_TYPE_RXDB)) {
+ imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
+ priv->dcfg->xSR[IMX_MU_GSR]);
mbox_chan_received_data(chan, NULL);
} else {
dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
@@ -335,10 +345,10 @@ static int imx_mu_startup(struct mbox_chan *chan)

switch (cp->type) {
case IMX_MU_TYPE_RX:
- imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(cp->idx), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx), 0);
break;
case IMX_MU_TYPE_RXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIEn(cp->idx), 0);
+ imx_mu_xcr_rmw(priv, IMX_MU_GIER, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx), 0);
break;
default:
break;
@@ -360,13 +370,13 @@ static void imx_mu_shutdown(struct mbox_chan *chan)

switch (cp->type) {
case IMX_MU_TYPE_TX:
- imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(cp->idx));
+ imx_mu_xcr_rmw(priv, IMX_MU_TCR, 0, IMX_MU_xCR_TIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RX:
- imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(cp->idx));
+ imx_mu_xcr_rmw(priv, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RXDB:
- imx_mu_xcr_rmw(priv, IMX_MU_GCR, 0, IMX_MU_xCR_GIEn(cp->idx));
+ imx_mu_xcr_rmw(priv, IMX_MU_GIER, 0, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
break;
default:
break;
@@ -600,12 +610,23 @@ static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
.xCR = {0x64, 0x64, 0x64, 0x64},
};

+static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
+ .tx = imx_mu_generic_tx,
+ .rx = imx_mu_generic_rx,
+ .init = imx_mu_init_generic,
+ .type = IMX_MU_V2,
+ .xTR = 0x200,
+ .xRR = 0x280,
+ .xSR = {0xC, 0x118, 0x124, 0x12C},
+ .xCR = {0x110, 0x114, 0x120, 0x128},
+};
+
static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
.tx = imx_mu_scu_tx,
.rx = imx_mu_scu_rx,
.init = imx_mu_init_scu,
- .xTR = 0x0
- .xRR = 0x10
+ .xTR = 0x0,
+ .xRR = 0x10,
.xSR = {0x20, 0x20, 0x20, 0x20},
.xCR = {0x24, 0x24, 0x24, 0x24},
};
@@ -613,6 +634,7 @@ static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
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 },
+ { .compatible = "fsl,imx8ulp-mu", .data = &imx_mu_cfg_imx8ulp },
{ .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
{ },
};
--
2.30.0

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