// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018 Pengutronix, Oleksij Rempel <[email protected]>
* Copyright 2022 NXP, Peng Fan <[email protected]>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/firmware/imx/ipc.h>
#include <linux/firmware/imx/s4.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/suspend.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "mailbox.h"
#define IMX_MU_CHANS 24
/* TX0/RX0/RXDB[0-3] */
#define IMX_MU_SCU_CHANS 6
/* TX0/RX0 */
#define IMX_MU_S4_CHANS 2
#define IMX_MU_CHAN_NAME_SIZE 32
#define IMX_MU_V2_PAR_OFF 0x4
#define IMX_MU_V2_TR_MASK GENMASK(7, 0)
#define IMX_MU_V2_RR_MASK GENMASK(15, 8)
#define IMX_MU_SECO_TX_TOUT (msecs_to_jiffies(3000))
#define IMX_MU_SECO_RX_TOUT (msecs_to_jiffies(3000))
/* Please not change TX & RX */
enum imx_mu_chan_type {
IMX_MU_TYPE_TX = 0, /* Tx */
IMX_MU_TYPE_RX = 1, /* Rx */
IMX_MU_TYPE_TXDB = 2, /* Tx doorbell */
IMX_MU_TYPE_RXDB = 3, /* Rx doorbell */
IMX_MU_TYPE_RST = 4, /* Reset */
IMX_MU_TYPE_TXDB_V2 = 5, /* Tx doorbell with S/W ACK */
};
enum imx_mu_xcr {
IMX_MU_CR,
IMX_MU_GIER,
IMX_MU_GCR,
IMX_MU_TCR,
IMX_MU_RCR,
IMX_MU_xCR_MAX,
};
enum imx_mu_xsr {
IMX_MU_SR,
IMX_MU_GSR,
IMX_MU_TSR,
IMX_MU_RSR,
IMX_MU_xSR_MAX,
};
struct imx_sc_rpc_msg_max {
struct imx_sc_rpc_msg hdr;
u32 data[30];
};
struct imx_s4_rpc_msg_max {
struct imx_s4_rpc_msg hdr;
u32 data[254];
};
struct imx_mu_con_priv {
unsigned int idx;
char irq_desc[IMX_MU_CHAN_NAME_SIZE];
enum imx_mu_chan_type type;
struct mbox_chan *chan;
struct work_struct txdb_work;
};
struct imx_mu_priv {
struct device *dev;
void __iomem *base;
void *msg;
spinlock_t xcr_lock; /* control register lock */
struct mbox_controller mbox;
struct mbox_chan mbox_chans[IMX_MU_CHANS];
struct imx_mu_con_priv con_priv[IMX_MU_CHANS];
const struct imx_mu_dcfg *dcfg;
struct clk *clk;
int irq[IMX_MU_CHANS];
bool suspend;
bool side_b;
u32 xcr[IMX_MU_xCR_MAX];
u32 num_tr;
u32 num_rr;
};
enum imx_mu_type {
IMX_MU_V1,
IMX_MU_V2 = BIT(1),
IMX_MU_V2_S4 = BIT(15),
IMX_MU_V2_IRQ = BIT(16),
};
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);
int (*rxdb)(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp);
int (*init)(struct imx_mu_priv *priv);
enum imx_mu_type type;
u32 xTR; /* Transmit Register0 */
u32 xRR; /* Receive Register0 */
u32 xSR[IMX_MU_xSR_MAX]; /* Status Registers */
u32 xCR[IMX_MU_xCR_MAX]; /* 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))))
/* MU reset */
#define IMX_MU_xCR_RST(type) (type & IMX_MU_V2 ? BIT(0) : BIT(5))
#define IMX_MU_xSR_RST(type) (type & IMX_MU_V2 ? BIT(0) : BIT(7))
static struct imx_mu_priv *to_imx_mu_priv(struct mbox_controller *mbox)
{
return container_of(mbox, struct imx_mu_priv, mbox);
}
static void imx_mu_write(struct imx_mu_priv *priv, u32 val, u32 offs)
{
iowrite32(val, priv->base + offs);
}
static u32 imx_mu_read(struct imx_mu_priv *priv, u32 offs)
{
return ioread32(priv->base + offs);
}
static int imx_mu_tx_waiting_write(struct imx_mu_priv *priv, u32 val, u32 idx)
{
u64 timeout_time = get_jiffies_64() + IMX_MU_SECO_TX_TOUT;
u32 status;
u32 can_write;
dev_dbg(priv->dev, "Trying to write %.8x to idx %d\n", val, idx);
do {
status = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_TSR]);
can_write = status & IMX_MU_xSR_TEn(priv->dcfg->type, idx % 4);
} while (!can_write && time_is_after_jiffies64(timeout_time));
if (!can_write) {
dev_err(priv->dev, "timeout trying to write %.8x at %d(%.8x)\n",
val, idx, status);
return -ETIME;
}
imx_mu_write(priv, val, priv->dcfg->xTR + (idx % 4) * 4);
return 0;
}
static int imx_mu_rx_waiting_read(struct imx_mu_priv *priv, u32 *val, u32 idx)
{
u64 timeout_time = get_jiffies_64() + IMX_MU_SECO_RX_TOUT;
u32 status;
u32 can_read;
dev_dbg(priv->dev, "Trying to read from idx %d\n", idx);
do {
status = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_RSR]);
can_read = status & IMX_MU_xSR_RFn(priv->dcfg->type, idx % 4);
} while (!can_read && time_is_after_jiffies64(timeout_time));
if (!can_read) {
dev_err(priv->dev, "timeout trying to read idx %d (%.8x)\n",
idx, status);
return -ETIME;
}
*val = imx_mu_read(priv, priv->dcfg->xRR + (idx % 4) * 4);
dev_dbg(priv->dev, "Read %.8x\n", *val);
return 0;
}
static u32 imx_mu_xcr_rmw(struct imx_mu_priv *priv, enum imx_mu_xcr type, u32 set, u32 clr)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&priv->xcr_lock, flags);
val = imx_mu_read(priv, priv->dcfg->xCR[type]);
val &= ~clr;
val |= set;
imx_mu_write(priv, val, priv->dcfg->xCR[type]);
spin_unlock_irqrestore(&priv->xcr_lock, flags);
return val;
}
static int imx_mu_generic_tx(struct imx_mu_priv *priv,
struct imx_mu_con_priv *cp,
void *data)
{
u32 *arg = data;
u32 val;
int ret;
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(priv->dcfg->type, cp->idx), 0);
break;
case IMX_MU_TYPE_TXDB:
imx_mu_xcr_rmw(priv, IMX_MU_GCR, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
queue_work(system_bh_wq, &cp->txdb_work);
break;
case IMX_MU_TYPE_TXDB_V2:
imx_mu_write(priv, IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx),
priv->dcfg->xCR[IMX_MU_GCR]);
ret = readl_poll_timeout(priv->base + priv->dcfg->xCR[IMX_MU_GCR], val,
!(val & IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx)),
0, 1000);
if (ret)
dev_warn_ratelimited(priv->dev, "channel type: %d failure\n", cp->type);
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) * 4);
mbox_chan_received_data(cp->chan, (void *)&dat);
return 0;
}
static int imx_mu_generic_rxdb(struct imx_mu_priv *priv,
struct imx_mu_con_priv *cp)
{
imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
priv->dcfg->xSR[IMX_MU_GSR]);
mbox_chan_received_data(cp->chan, NULL);
return 0;
}
static int imx_mu_specific_tx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp, void *data)
{
u32 *arg = data;
u32 num_tr = priv->num_tr;
int i, ret;
u32 xsr;
u32 size, max_size;
if (priv->dcfg->type & IMX_MU_V2_S4) {
size = ((struct imx_s4_rpc_msg_max *)data)->hdr.size;
max_size = sizeof(struct imx_s4_rpc_msg_max);
} else {
size = ((struct imx_sc_rpc_msg_max *)data)->hdr.size;
max_size = sizeof(struct imx_sc_rpc_msg_max);
}
switch (cp->type) {
case IMX_MU_TYPE_TX:
/*
* msg->hdr.size specifies the number of u32 words while
* sizeof yields bytes.
*/
if (size > max_size / 4) {
/*
* The real message size can be different to
* struct imx_sc_rpc_msg_max/imx_s4_rpc_msg_max size
*/
dev_err(priv->dev, "Maximal message size (%u bytes) exceeded on TX; got: %i bytes\n", max_size, size << 2);
return -EINVAL;
}
for (i = 0; i < num_tr && i < size; i++)
imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % num_tr) * 4);
for (; i < size; i++) {
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_TSR],
xsr,
xsr & IMX_MU_xSR_TEn(priv->dcfg->type, i % num_tr),
0, 5 * USEC_PER_SEC);
if (ret) {
dev_err(priv->dev, "Send data index: %d timeout\n", i);
return ret;
}
imx_mu_write(priv, *arg++, priv->dcfg->xTR + (i % num_tr) * 4);
}
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);
return -EINVAL;
}
return 0;
}
static int imx_mu_specific_rx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp)
{
u32 *data;
int i, ret;
u32 xsr;
u32 size, max_size;
u32 num_rr = priv->num_rr;
data = (u32 *)priv->msg;
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 (priv->dcfg->type & IMX_MU_V2_S4) {
size = ((struct imx_s4_rpc_msg_max *)priv->msg)->hdr.size;
max_size = sizeof(struct imx_s4_rpc_msg_max);
} else {
size = ((struct imx_sc_rpc_msg_max *)priv->msg)->hdr.size;
max_size = sizeof(struct imx_sc_rpc_msg_max);
}
if (size > max_size / 4) {
dev_err(priv->dev, "Maximal message size (%u bytes) exceeded on RX; got: %i bytes\n", max_size, size << 2);
return -EINVAL;
}
for (i = 1; i < size; i++) {
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_RSR], xsr,
xsr & IMX_MU_xSR_RFn(priv->dcfg->type, i % num_rr), 0,
5 * USEC_PER_SEC);
if (ret) {
dev_err(priv->dev, "timeout read idx %d\n", i);
return ret;
}
*data++ = imx_mu_read(priv, priv->dcfg->xRR + (i % num_rr) * 4);
}
imx_mu_xcr_rmw(priv, IMX_MU_RCR, IMX_MU_xCR_RIEn(priv->dcfg->type, 0), 0);
mbox_chan_received_data(cp->chan, (void *)priv->msg);
return 0;
}
static int imx_mu_seco_tx(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp,
void *data)
{
struct imx_sc_rpc_msg_max *msg = data;
u32 *arg = data;
u32 byte_size;
int err;
int i;
dev_dbg(priv->dev, "Sending message\n");
switch (cp->type) {
case IMX_MU_TYPE_TXDB:
byte_size = msg->hdr.size * sizeof(u32);
if (byte_size > sizeof(*msg)) {
/*
* The real message size can be different to
* struct imx_sc_rpc_msg_max size
*/
dev_err(priv->dev,
"Exceed max msg size (%zu) on TX, got: %i\n",
sizeof(*msg), byte_size);
return -EINVAL;
}
print_hex_dump_debug("from client ", DUMP_PREFIX_OFFSET, 4, 4,
data, byte_size, false);
/* Send first word */
dev_dbg(priv->dev, "Sending header\n");
imx_mu_write(priv, *arg++, priv->dcfg->xTR);
/* Send signaling */
dev_dbg(priv->dev, "Sending signaling\n");
imx_mu_xcr_rmw(priv, IMX_MU_GCR,
IMX_MU_xCR_GIRn(priv->dcfg->type, cp->idx), 0);
/* Send words to fill the mailbox */
for (i = 1; i < 4 && i < msg->hdr.size; i++) {
dev_dbg(priv->dev, "Sending word %d\n", i);
imx_mu_write(priv, *arg++,
priv->dcfg->xTR + (i % 4) * 4);
}
/* Send rest of message waiting for remote read */
for (; i < msg->hdr.size; i++) {
dev_dbg(priv->dev, "Sending word %d\n", i);
err = imx_mu_tx_waiting_write(priv, *arg++, i);
if (err) {
dev_err(priv->dev, "Timeout tx %d\n", i);
return err;
}
}
/* Simulate hack for mbox framework */
queue_work(system_bh_wq, &cp->txdb_work);
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_seco_rxdb(struct imx_mu_priv *priv, struct imx_mu_con_priv *cp)
{
struct imx_sc_rpc_msg_max msg;
u32 *data = (u32 *)&msg;
u32 byte_size;
int err = 0;
int i;
dev_dbg(priv->dev, "Receiving message\n");
/* Read header */
dev_dbg(priv->dev, "Receiving header\n");
*data++ = imx_mu_read(priv, priv->dcfg->xRR);
byte_size = msg.hdr.size * sizeof(u32);
if (byte_size > sizeof(msg)) {
dev_err(priv->dev, "Exceed max msg size (%zu) on RX, got: %i\n",
sizeof(msg), byte_size);
err = -EINVAL;
goto error;
}
/* Read message waiting they are written */
for (i = 1; i < msg.hdr.size; i++) {
dev_dbg(priv->dev, "Receiving word %d\n", i);
err = imx_mu_rx_waiting_read(priv, data++, i);
if (err) {
dev_err(priv->dev, "Timeout rx %d\n", i);
goto error;
}
}
/* Clear GIP */
imx_mu_write(priv, IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx),
priv->dcfg->xSR[IMX_MU_GSR]);
print_hex_dump_debug("to client ", DUMP_PREFIX_OFFSET, 4, 4,
&msg, byte_size, false);
/* send data to client */
dev_dbg(priv->dev, "Sending message to client\n");
mbox_chan_received_data(cp->chan, (void *)&msg);
goto exit;
error:
mbox_chan_received_data(cp->chan, ERR_PTR(err));
exit:
return err;
}
static void imx_mu_txdb_work(struct work_struct *t)
{
struct imx_mu_con_priv *cp = from_work(cp, t, txdb_work);
mbox_chan_txdone(cp->chan, 0);
}
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;
switch (cp->type) {
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(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(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_GIER]);
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
val &= IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx) &
(ctrl & IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RST:
return IRQ_NONE;
default:
dev_warn_ratelimited(priv->dev, "Unhandled channel type %d\n",
cp->type);
return IRQ_NONE;
}
if (!val)
return IRQ_NONE;
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(priv->dcfg->type, cp->idx)) &&
(cp->type == IMX_MU_TYPE_RX)) {
priv->dcfg->rx(priv, cp);
} else if ((val == IMX_MU_xSR_GIPn(priv->dcfg->type, cp->idx)) &&
(cp->type == IMX_MU_TYPE_RXDB)) {
priv->dcfg->rxdb(priv, cp);
} else {
dev_warn_ratelimited(priv->dev, "Not handled interrupt\n");
return IRQ_NONE;
}
if (priv->suspend)
pm_system_wakeup();
return IRQ_HANDLED;
}
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;
return priv->dcfg->tx(priv, cp, data);
}
static int imx_mu_startup(struct mbox_chan *chan)
{
struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
struct imx_mu_con_priv *cp = chan->con_priv;
unsigned long irq_flag = 0;
int ret;
pm_runtime_get_sync(priv->dev);
if (cp->type == IMX_MU_TYPE_TXDB_V2)
return 0;
if (cp->type == IMX_MU_TYPE_TXDB) {
/* Tx doorbell don't have ACK support */
INIT_WORK(&cp->txdb_work, imx_mu_txdb_work);
return 0;
}
/* IPC MU should be with IRQF_NO_SUSPEND set */
if (!priv->dev->pm_domain)
irq_flag |= IRQF_NO_SUSPEND;
if (!(priv->dcfg->type & IMX_MU_V2_IRQ))
irq_flag |= IRQF_SHARED;
ret = request_irq(priv->irq[cp->type], imx_mu_isr, irq_flag, cp->irq_desc, chan);
if (ret) {
dev_err(priv->dev, "Unable to acquire IRQ %d\n", priv->irq[cp->type]);
return ret;
}
switch (cp->type) {
case IMX_MU_TYPE_RX:
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_GIER, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx), 0);
break;
default:
break;
}
return 0;
}
static void imx_mu_shutdown(struct mbox_chan *chan)
{
struct imx_mu_priv *priv = to_imx_mu_priv(chan->mbox);
struct imx_mu_con_priv *cp = chan->con_priv;
int ret;
u32 sr;
if (cp->type == IMX_MU_TYPE_TXDB_V2) {
pm_runtime_put_sync(priv->dev);
return;
}
if (cp->type == IMX_MU_TYPE_TXDB) {
cancel_work_sync(&cp->txdb_work);
pm_runtime_put_sync(priv->dev);
return;
}
switch (cp->type) {
case IMX_MU_TYPE_TX:
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(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RXDB:
imx_mu_xcr_rmw(priv, IMX_MU_GIER, 0, IMX_MU_xCR_GIEn(priv->dcfg->type, cp->idx));
break;
case IMX_MU_TYPE_RST:
imx_mu_xcr_rmw(priv, IMX_MU_CR, IMX_MU_xCR_RST(priv->dcfg->type), 0);
ret = readl_poll_timeout(priv->base + priv->dcfg->xSR[IMX_MU_SR], sr,
!(sr & IMX_MU_xSR_RST(priv->dcfg->type)), 1, 5);
if (ret)
dev_warn(priv->dev, "RST channel timeout\n");
break;
default:
break;
}
free_irq(priv->irq[cp->type], chan);
pm_runtime_put_sync(priv->dev);
}
static const struct mbox_chan_ops imx_mu_ops = {
.send_data = imx_mu_send_data,
.startup = imx_mu_startup,
.shutdown = imx_mu_shutdown,
};
static struct mbox_chan *imx_mu_specific_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
u32 type, idx, chan;
if (sp->args_count != 2) {
dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
return ERR_PTR(-EINVAL);
}
type = sp->args[0]; /* channel type */
idx = sp->args[1]; /* index */
switch (type) {
case IMX_MU_TYPE_TX:
case IMX_MU_TYPE_RX:
if (idx != 0)
dev_err(mbox->dev, "Invalid chan idx: %d\n", idx);
chan = type;
break;
case IMX_MU_TYPE_RXDB:
chan = 2 + idx;
break;
default:
dev_err(mbox->dev, "Invalid chan type: %d\n", type);
return ERR_PTR(-EINVAL);
}
if (chan >= mbox->num_chans) {
dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
return ERR_PTR(-EINVAL);
}
return &mbox->chans[chan];
}
static struct mbox_chan * imx_mu_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
struct mbox_chan *p_chan;
u32 type, idx, chan;
if (sp->args_count != 2) {
dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
return ERR_PTR(-EINVAL);
}
type = sp->args[0]; /* channel type */
idx = sp->args[1]; /* index */
/* RST only supports 1 channel */
if ((type == IMX_MU_TYPE_RST) && idx) {
dev_err(mbox->dev, "Invalid RST channel %d\n", idx);
return ERR_PTR(-EINVAL);
}
chan = type * 4 + idx;
if (chan >= mbox->num_chans) {
dev_err(mbox->dev, "Not supported channel number: %d. (type: %d, idx: %d)\n", chan, type, idx);
return ERR_PTR(-EINVAL);
}
p_chan = &mbox->chans[chan];
if (type == IMX_MU_TYPE_TXDB_V2)
p_chan->txdone_method = TXDONE_BY_ACK;
return p_chan;
}
static struct mbox_chan *imx_mu_seco_xlate(struct mbox_controller *mbox,
const struct of_phandle_args *sp)
{
u32 type;
if (sp->args_count < 1) {
dev_err(mbox->dev, "Invalid argument count %d\n", sp->args_count);
return ERR_PTR(-EINVAL);
}
type = sp->args[0]; /* channel type */
/* Only supports TXDB and RXDB */
if (type == IMX_MU_TYPE_TX || type == IMX_MU_TYPE_RX) {
dev_err(mbox->dev, "Invalid type: %d\n", type);
return ERR_PTR(-EINVAL);
}
return imx_mu_xlate(mbox, sp);
}
static void imx_mu_get_tr_rr(struct imx_mu_priv *priv)
{
u32 val;
if (priv->dcfg->type & IMX_MU_V2) {
val = imx_mu_read(priv, IMX_MU_V2_PAR_OFF);
priv->num_tr = FIELD_GET(IMX_MU_V2_TR_MASK, val);
priv->num_rr = FIELD_GET(IMX_MU_V2_RR_MASK, val);
} else {
priv->num_tr = 4;
priv->num_rr = 4;
}
}
static int imx_mu_init_generic(struct imx_mu_priv *priv)
{
unsigned int i;
unsigned int val;
if (priv->num_rr > 4 || priv->num_tr > 4) {
WARN_ONCE(true, "%s not support TR/RR larger than 4\n", __func__);
return -EOPNOTSUPP;
}
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),
"%s[%i-%i]", dev_name(priv->dev), cp->type, cp->idx);
}
priv->mbox.num_chans = IMX_MU_CHANS;
priv->mbox.of_xlate = imx_mu_xlate;
if (priv->side_b)
return 0;
/* Set default MU configuration */
for (i = 0; i < IMX_MU_xCR_MAX; i++)
imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
/* Clear any pending GIP */
val = imx_mu_read(priv, priv->dcfg->xSR[IMX_MU_GSR]);
imx_mu_write(priv, val, priv->dcfg->xSR[IMX_MU_GSR]);
/* Clear any pending RSR */
for (i = 0; i < priv->num_rr; i++)
imx_mu_read(priv, priv->dcfg->xRR + i * 4);
return 0;
}
static int imx_mu_init_specific(struct imx_mu_priv *priv)
{
unsigned int i;
int num_chans = priv->dcfg->type & IMX_MU_V2_S4 ? IMX_MU_S4_CHANS : IMX_MU_SCU_CHANS;
for (i = 0; i < num_chans; i++) {
struct imx_mu_con_priv *cp = &priv->con_priv[i];
cp->idx = i < 2 ? 0 : i - 2;
cp->type = i < 2 ? i : IMX_MU_TYPE_RXDB;
cp->chan = &priv->mbox_chans[i];
priv->mbox_chans[i].con_priv = cp;
snprintf(cp->irq_desc, sizeof(cp->irq_desc),
"%s[%i-%i]", dev_name(priv->dev), cp->type, cp->idx);
}
priv->mbox.num_chans = num_chans;
priv->mbox.of_xlate = imx_mu_specific_xlate;
/* Set default MU configuration */
for (i = 0; i < IMX_MU_xCR_MAX; i++)
imx_mu_write(priv, 0, priv->dcfg->xCR[i]);
return 0;
}
static int imx_mu_init_seco(struct imx_mu_priv *priv)
{
int ret;
ret = imx_mu_init_generic(priv);
if (ret)
return ret;
priv->mbox.of_xlate = imx_mu_seco_xlate;
return 0;
}
static int imx_mu_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct imx_mu_priv *priv;
const struct imx_mu_dcfg *dcfg;
int i, ret;
u32 size;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
priv->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
dcfg = of_device_get_match_data(dev);
if (!dcfg)
return -EINVAL;
priv->dcfg = dcfg;
if (priv->dcfg->type & IMX_MU_V2_IRQ) {
priv->irq[IMX_MU_TYPE_TX] = platform_get_irq_byname(pdev, "tx");
if (priv->irq[IMX_MU_TYPE_TX] < 0)
return priv->irq[IMX_MU_TYPE_TX];
priv->irq[IMX_MU_TYPE_RX] = platform_get_irq_byname(pdev, "rx");
if (priv->irq[IMX_MU_TYPE_RX] < 0)
return priv->irq[IMX_MU_TYPE_RX];
} else {
ret = platform_get_irq(pdev, 0);
if (ret < 0)
return ret;
for (i = 0; i < IMX_MU_CHANS; i++)
priv->irq[i] = ret;
}
if (priv->dcfg->type & IMX_MU_V2_S4)
size = sizeof(struct imx_s4_rpc_msg_max);
else
size = sizeof(struct imx_sc_rpc_msg_max);
priv->msg = devm_kzalloc(dev, size, GFP_KERNEL);
if (!priv->msg)
return -ENOMEM;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
if (PTR_ERR(priv->clk) != -ENOENT)
return PTR_ERR(priv->clk);
priv->clk = NULL;
}
ret = clk_prepare_enable(priv->clk);
if (ret) {
dev_err(dev, "Failed to enable clock\n");
return ret;
}
imx_mu_get_tr_rr(priv);
priv->side_b = of_property_read_bool(np, "fsl,mu-side-b");
ret = priv->dcfg->init(priv);
if (ret) {
dev_err(dev, "Failed to init MU\n");
goto disable_clk;
}
spin_lock_init(&priv->xcr_lock);
priv->mbox.dev = dev;
priv->mbox.ops = &imx_mu_ops;
priv->mbox.chans = priv->mbox_chans;
priv->mbox.txdone_irq = true;
platform_set_drvdata(pdev, priv);
ret = devm_mbox_controller_register(dev, &priv->mbox);
if (ret)
goto disable_clk;
of_platform_populate(dev->of_node, NULL, NULL, dev);
pm_runtime_enable(dev);
ret = pm_runtime_resume_and_get(dev);
if (ret < 0)
goto disable_runtime_pm;
ret = pm_runtime_put_sync(dev);
if (ret < 0)
goto disable_runtime_pm;
clk_disable_unprepare(priv->clk);
return 0;
disable_runtime_pm:
pm_runtime_disable(dev);
disable_clk:
clk_disable_unprepare(priv->clk);
return ret;
}
static void imx_mu_remove(struct platform_device *pdev)
{
struct imx_mu_priv *priv = platform_get_drvdata(pdev);
pm_runtime_disable(priv->dev);
}
static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
.tx = imx_mu_generic_tx,
.rx = imx_mu_generic_rx,
.rxdb = imx_mu_generic_rxdb,
.init = imx_mu_init_generic,
.xTR = 0x0,
.xRR = 0x10,
.xSR = {0x20, 0x20, 0x20, 0x20},
.xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
.tx = imx_mu_generic_tx,
.rx = imx_mu_generic_rx,
.rxdb = imx_mu_generic_rxdb,
.init = imx_mu_init_generic,
.xTR = 0x20,
.xRR = 0x40,
.xSR = {0x60, 0x60, 0x60, 0x60},
.xCR = {0x64, 0x64, 0x64, 0x64, 0x64},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
.tx = imx_mu_generic_tx,
.rx = imx_mu_generic_rx,
.rxdb = imx_mu_generic_rxdb,
.init = imx_mu_init_generic,
.type = IMX_MU_V2,
.xTR = 0x200,
.xRR = 0x280,
.xSR = {0xC, 0x118, 0x124, 0x12C},
.xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp_s4 = {
.tx = imx_mu_specific_tx,
.rx = imx_mu_specific_rx,
.init = imx_mu_init_specific,
.type = IMX_MU_V2 | IMX_MU_V2_S4,
.xTR = 0x200,
.xRR = 0x280,
.xSR = {0xC, 0x118, 0x124, 0x12C},
.xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx93_s4 = {
.tx = imx_mu_specific_tx,
.rx = imx_mu_specific_rx,
.init = imx_mu_init_specific,
.type = IMX_MU_V2 | IMX_MU_V2_S4 | IMX_MU_V2_IRQ,
.xTR = 0x200,
.xRR = 0x280,
.xSR = {0xC, 0x118, 0x124, 0x12C},
.xCR = {0x8, 0x110, 0x114, 0x120, 0x128},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx8_scu = {
.tx = imx_mu_specific_tx,
.rx = imx_mu_specific_rx,
.init = imx_mu_init_specific,
.rxdb = imx_mu_generic_rxdb,
.xTR = 0x0,
.xRR = 0x10,
.xSR = {0x20, 0x20, 0x20, 0x20},
.xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx8_seco = {
.tx = imx_mu_seco_tx,
.rx = imx_mu_generic_rx,
.rxdb = imx_mu_seco_rxdb,
.init = imx_mu_init_seco,
.xTR = 0x0,
.xRR = 0x10,
.xSR = {0x20, 0x20, 0x20, 0x20},
.xCR = {0x24, 0x24, 0x24, 0x24, 0x24},
};
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,imx8ulp-mu-s4", .data = &imx_mu_cfg_imx8ulp_s4 },
{ .compatible = "fsl,imx93-mu-s4", .data = &imx_mu_cfg_imx93_s4 },
{ .compatible = "fsl,imx95-mu", .data = &imx_mu_cfg_imx8ulp },
{ .compatible = "fsl,imx95-mu-ele", .data = &imx_mu_cfg_imx8ulp_s4 },
{ .compatible = "fsl,imx95-mu-v2x", .data = &imx_mu_cfg_imx8ulp_s4 },
{ .compatible = "fsl,imx8-mu-scu", .data = &imx_mu_cfg_imx8_scu },
{ .compatible = "fsl,imx8-mu-seco", .data = &imx_mu_cfg_imx8_seco },
{ },
};
MODULE_DEVICE_TABLE(of, imx_mu_dt_ids);
static int __maybe_unused imx_mu_suspend_noirq(struct device *dev)
{
struct imx_mu_priv *priv = dev_get_drvdata(dev);
int i;
if (!priv->clk) {
for (i = 0; i < IMX_MU_xCR_MAX; i++)
priv->xcr[i] = imx_mu_read(priv, priv->dcfg->xCR[i]);
}
priv->suspend = true;
return 0;
}
static int __maybe_unused imx_mu_resume_noirq(struct device *dev)
{
struct imx_mu_priv *priv = dev_get_drvdata(dev);
int i;
/*
* ONLY restore MU when context lost, the TIE could
* be set during noirq resume as there is MU data
* communication going on, and restore the saved
* value will overwrite the TIE and cause MU data
* send failed, may lead to system freeze. This issue
* is observed by testing freeze mode suspend.
*/
if (!priv->clk && !imx_mu_read(priv, priv->dcfg->xCR[0])) {
for (i = 0; i < IMX_MU_xCR_MAX; i++)
imx_mu_write(priv, priv->xcr[i], priv->dcfg->xCR[i]);
}
priv->suspend = false;
return 0;
}
static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
{
struct imx_mu_priv *priv = dev_get_drvdata(dev);
clk_disable_unprepare(priv->clk);
return 0;
}
static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
{
struct imx_mu_priv *priv = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(priv->clk);
if (ret)
dev_err(dev, "failed to enable clock\n");
return ret;
}
static const struct dev_pm_ops imx_mu_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_mu_suspend_noirq,
imx_mu_resume_noirq)
SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
imx_mu_runtime_resume, NULL)
};
static struct platform_driver imx_mu_driver = {
.probe = imx_mu_probe,
.remove_new = imx_mu_remove,
.driver = {
.name = "imx_mu",
.of_match_table = imx_mu_dt_ids,
.pm = &imx_mu_pm_ops,
},
};
module_platform_driver(imx_mu_driver);
MODULE_AUTHOR("Oleksij Rempel <[email protected]>");
MODULE_DESCRIPTION("Message Unit driver for i.MX");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux