636 lines
16 KiB
C
636 lines
16 KiB
C
/*
|
|
* Copyright (C) 2015 Freescale Semiconductor, Inc.
|
|
* Copyright 2017-2018 NXP
|
|
*
|
|
* derived from the omap-rpmsg implementation.
|
|
*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#include <linux/clk.h>
|
|
#include <linux/err.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/module.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/rpmsg.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/virtio.h>
|
|
#include <linux/virtio_config.h>
|
|
#include <linux/virtio_ids.h>
|
|
#include <linux/virtio_ring.h>
|
|
#include <linux/imx_rpmsg.h>
|
|
#include <linux/mx8_mu.h>
|
|
|
|
enum imx_rpmsg_variants {
|
|
IMX6SX,
|
|
IMX7D,
|
|
IMX7ULP,
|
|
IMX8QXP,
|
|
IMX8QM,
|
|
};
|
|
|
|
struct imx_virdev {
|
|
struct virtio_device vdev;
|
|
unsigned int vring[2];
|
|
struct virtqueue *vq[2];
|
|
int base_vq_id;
|
|
int num_of_vqs;
|
|
struct notifier_block nb;
|
|
};
|
|
|
|
struct imx_rpmsg_vproc {
|
|
char *rproc_name;
|
|
struct mutex lock;
|
|
struct clk *mu_clk;
|
|
enum imx_rpmsg_variants variant;
|
|
int vdev_nums;
|
|
int first_notify;
|
|
#define MAX_VDEV_NUMS 8
|
|
struct imx_virdev ivdev[MAX_VDEV_NUMS];
|
|
void __iomem *mu_base;
|
|
struct delayed_work rpmsg_work;
|
|
struct blocking_notifier_head notifier;
|
|
#define MAX_NUM 10 /* enlarge it if overflow happen */
|
|
u32 m4_message[MAX_NUM];
|
|
u32 in_idx;
|
|
u32 out_idx;
|
|
u32 core_id;
|
|
spinlock_t mu_lock;
|
|
};
|
|
|
|
/*
|
|
* For now, allocate 256 buffers of 512 bytes for each side. each buffer
|
|
* will then have 16B for the msg header and 496B for the payload.
|
|
* This will require a total space of 256KB for the buffers themselves, and
|
|
* 3 pages for every vring (the size of the vring depends on the number of
|
|
* buffers it supports).
|
|
*/
|
|
#define RPMSG_NUM_BUFS (512)
|
|
#define RPMSG_BUF_SIZE (512)
|
|
#define RPMSG_BUFS_SPACE (RPMSG_NUM_BUFS * RPMSG_BUF_SIZE)
|
|
|
|
/*
|
|
* The alignment between the consumer and producer parts of the vring.
|
|
* Note: this is part of the "wire" protocol. If you change this, you need
|
|
* to update your BIOS image as well
|
|
*/
|
|
#define RPMSG_VRING_ALIGN (4096)
|
|
|
|
/* With 256 buffers, our vring will occupy 3 pages */
|
|
#define RPMSG_RING_SIZE ((DIV_ROUND_UP(vring_size(RPMSG_NUM_BUFS / 2, \
|
|
RPMSG_VRING_ALIGN), PAGE_SIZE)) * PAGE_SIZE)
|
|
|
|
#define to_imx_virdev(vd) container_of(vd, struct imx_virdev, vdev)
|
|
#define to_imx_rpdev(vd, id) container_of(vd, struct imx_rpmsg_vproc, ivdev[id])
|
|
|
|
struct imx_rpmsg_vq_info {
|
|
__u16 num; /* number of entries in the virtio_ring */
|
|
__u16 vq_id; /* a globaly unique index of this virtqueue */
|
|
void *addr; /* address where we mapped the virtio ring */
|
|
struct imx_rpmsg_vproc *rpdev;
|
|
};
|
|
|
|
static u64 imx_rpmsg_get_features(struct virtio_device *vdev)
|
|
{
|
|
/* VIRTIO_RPMSG_F_NS has been made private */
|
|
return 1 << 0;
|
|
}
|
|
|
|
static int imx_rpmsg_finalize_features(struct virtio_device *vdev)
|
|
{
|
|
/* Give virtio_ring a chance to accept features */
|
|
vring_transport_features(vdev);
|
|
return 0;
|
|
}
|
|
|
|
/* kick the remote processor, and let it know which virtqueue to poke at */
|
|
static bool imx_rpmsg_notify(struct virtqueue *vq)
|
|
{
|
|
unsigned int mu_rpmsg = 0;
|
|
struct imx_rpmsg_vq_info *rpvq = vq->priv;
|
|
|
|
mu_rpmsg = rpvq->vq_id << 16;
|
|
mutex_lock(&rpvq->rpdev->lock);
|
|
/*
|
|
* Send the index of the triggered virtqueue as the mu payload.
|
|
* Use the timeout MU send message here.
|
|
* Since that M4 core may not be loaded, and the first MSG may
|
|
* not be handled by M4 when multi-vdev is enabled.
|
|
* To make sure that the message wound't be discarded when M4
|
|
* is running normally or in the suspend mode. Only use
|
|
* the timeout mechanism by the first notify when the vdev is
|
|
* registered.
|
|
*/
|
|
if (unlikely(rpvq->rpdev->first_notify > 0)) {
|
|
rpvq->rpdev->first_notify--;
|
|
MU_SendMessageTimeout(rpvq->rpdev->mu_base, 1, mu_rpmsg, 200);
|
|
} else {
|
|
MU_SendMessage(rpvq->rpdev->mu_base, 1, mu_rpmsg);
|
|
}
|
|
mutex_unlock(&rpvq->rpdev->lock);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int imx_mu_rpmsg_callback(struct notifier_block *this,
|
|
unsigned long index, void *data)
|
|
{
|
|
u32 mu_msg = (phys_addr_t) data;
|
|
struct imx_virdev *virdev;
|
|
|
|
virdev = container_of(this, struct imx_virdev, nb);
|
|
|
|
pr_debug("%s mu_msg: 0x%x\n", __func__, mu_msg);
|
|
/* ignore vq indices which are clearly not for us */
|
|
mu_msg = mu_msg >> 16;
|
|
if (mu_msg < virdev->base_vq_id || mu_msg > virdev->base_vq_id + 1) {
|
|
pr_debug("mu_msg: 0x%x is invalid\n", mu_msg);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
mu_msg -= virdev->base_vq_id;
|
|
|
|
/*
|
|
* Currently both PENDING_MSG and explicit-virtqueue-index
|
|
* messaging are supported.
|
|
* Whatever approach is taken, at this point 'mu_msg' contains
|
|
* the index of the vring which was just triggered.
|
|
*/
|
|
if (mu_msg < virdev->num_of_vqs)
|
|
vring_interrupt(mu_msg, virdev->vq[mu_msg]);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int imx_mu_rpmsg_register_nb(struct imx_rpmsg_vproc *rpdev,
|
|
struct notifier_block *nb)
|
|
{
|
|
if ((rpdev == NULL) || (nb == NULL))
|
|
return -EINVAL;
|
|
|
|
blocking_notifier_chain_register(&(rpdev->notifier), nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_mu_rpmsg_unregister_nb(struct imx_rpmsg_vproc *rpdev,
|
|
struct notifier_block *nb)
|
|
{
|
|
if ((rpdev == NULL) || (nb == NULL))
|
|
return -EINVAL;
|
|
|
|
blocking_notifier_chain_unregister(&(rpdev->notifier), nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
|
|
unsigned int index,
|
|
void (*callback)(struct virtqueue *vq),
|
|
const char *name,
|
|
bool ctx)
|
|
{
|
|
struct imx_virdev *virdev = to_imx_virdev(vdev);
|
|
struct imx_rpmsg_vproc *rpdev = to_imx_rpdev(virdev,
|
|
virdev->base_vq_id / 2);
|
|
struct imx_rpmsg_vq_info *rpvq;
|
|
struct virtqueue *vq;
|
|
int err;
|
|
|
|
rpvq = kmalloc(sizeof(*rpvq), GFP_KERNEL);
|
|
if (!rpvq)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* ioremap'ing normal memory, so we cast away sparse's complaints */
|
|
rpvq->addr = (__force void *) ioremap_nocache(virdev->vring[index],
|
|
RPMSG_RING_SIZE);
|
|
if (!rpvq->addr) {
|
|
err = -ENOMEM;
|
|
goto free_rpvq;
|
|
}
|
|
|
|
memset_io(rpvq->addr, 0, RPMSG_RING_SIZE);
|
|
|
|
pr_debug("vring%d: phys 0x%x, virt 0x%p\n", index, virdev->vring[index],
|
|
rpvq->addr);
|
|
|
|
vq = vring_new_virtqueue(index, RPMSG_NUM_BUFS / 2, RPMSG_VRING_ALIGN,
|
|
vdev, true, ctx,
|
|
rpvq->addr,
|
|
imx_rpmsg_notify, callback,
|
|
name);
|
|
if (!vq) {
|
|
pr_err("vring_new_virtqueue failed\n");
|
|
err = -ENOMEM;
|
|
goto unmap_vring;
|
|
}
|
|
|
|
virdev->vq[index] = vq;
|
|
vq->priv = rpvq;
|
|
/* system-wide unique id for this virtqueue */
|
|
rpvq->vq_id = virdev->base_vq_id + index;
|
|
rpvq->rpdev = rpdev;
|
|
mutex_init(&rpdev->lock);
|
|
|
|
return vq;
|
|
|
|
unmap_vring:
|
|
/* iounmap normal memory, so make sparse happy */
|
|
iounmap((__force void __iomem *) rpvq->addr);
|
|
free_rpvq:
|
|
kfree(rpvq);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void imx_rpmsg_del_vqs(struct virtio_device *vdev)
|
|
{
|
|
struct virtqueue *vq, *n;
|
|
struct imx_virdev *virdev = to_imx_virdev(vdev);
|
|
struct imx_rpmsg_vproc *rpdev = to_imx_rpdev(virdev,
|
|
virdev->base_vq_id / 2);
|
|
|
|
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
|
|
struct imx_rpmsg_vq_info *rpvq = vq->priv;
|
|
|
|
iounmap(rpvq->addr);
|
|
vring_del_virtqueue(vq);
|
|
kfree(rpvq);
|
|
}
|
|
|
|
if (&virdev->nb)
|
|
imx_mu_rpmsg_unregister_nb(rpdev, &virdev->nb);
|
|
}
|
|
|
|
static int imx_rpmsg_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
|
|
struct virtqueue *vqs[],
|
|
vq_callback_t *callbacks[],
|
|
const char * const names[],
|
|
const bool *ctx,
|
|
struct irq_affinity *desc)
|
|
{
|
|
struct imx_virdev *virdev = to_imx_virdev(vdev);
|
|
struct imx_rpmsg_vproc *rpdev = to_imx_rpdev(virdev,
|
|
virdev->base_vq_id / 2);
|
|
int i, err;
|
|
|
|
/* we maintain two virtqueues per remote processor (for RX and TX) */
|
|
if (nvqs != 2)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < nvqs; ++i) {
|
|
vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i],
|
|
ctx ? ctx[i] : false);
|
|
if (IS_ERR(vqs[i])) {
|
|
err = PTR_ERR(vqs[i]);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
virdev->num_of_vqs = nvqs;
|
|
|
|
virdev->nb.notifier_call = imx_mu_rpmsg_callback;
|
|
imx_mu_rpmsg_register_nb(rpdev, &virdev->nb);
|
|
|
|
return 0;
|
|
|
|
error:
|
|
imx_rpmsg_del_vqs(vdev);
|
|
return err;
|
|
}
|
|
|
|
static void imx_rpmsg_reset(struct virtio_device *vdev)
|
|
{
|
|
dev_dbg(&vdev->dev, "reset !\n");
|
|
}
|
|
|
|
static u8 imx_rpmsg_get_status(struct virtio_device *vdev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void imx_rpmsg_set_status(struct virtio_device *vdev, u8 status)
|
|
{
|
|
dev_dbg(&vdev->dev, "%s new status: %d\n", __func__, status);
|
|
}
|
|
|
|
static void imx_rpmsg_vproc_release(struct device *dev)
|
|
{
|
|
/* this handler is provided so driver core doesn't yell at us */
|
|
}
|
|
|
|
static struct virtio_config_ops imx_rpmsg_config_ops = {
|
|
.get_features = imx_rpmsg_get_features,
|
|
.finalize_features = imx_rpmsg_finalize_features,
|
|
.find_vqs = imx_rpmsg_find_vqs,
|
|
.del_vqs = imx_rpmsg_del_vqs,
|
|
.reset = imx_rpmsg_reset,
|
|
.set_status = imx_rpmsg_set_status,
|
|
.get_status = imx_rpmsg_get_status,
|
|
};
|
|
|
|
static struct imx_rpmsg_vproc imx_rpmsg_vprocs[] = {
|
|
{
|
|
.rproc_name = "m4",
|
|
},
|
|
{
|
|
.rproc_name = "m4",
|
|
},
|
|
};
|
|
|
|
static const struct of_device_id imx_rpmsg_dt_ids[] = {
|
|
{ .compatible = "fsl,imx6sx-rpmsg", .data = (void *)IMX6SX, },
|
|
{ .compatible = "fsl,imx7d-rpmsg", .data = (void *)IMX7D, },
|
|
{ .compatible = "fsl,imx7ulp-rpmsg", .data = (void *)IMX7ULP, },
|
|
{ .compatible = "fsl,imx8qxp-rpmsg", .data = (void *)IMX8QXP, },
|
|
{ .compatible = "fsl,imx8qm-rpmsg", .data = (void *)IMX8QM, },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx_rpmsg_dt_ids);
|
|
|
|
static int set_vring_phy_buf(struct platform_device *pdev,
|
|
struct imx_rpmsg_vproc *rpdev, int vdev_nums)
|
|
{
|
|
struct resource *res;
|
|
resource_size_t size;
|
|
unsigned int start, end;
|
|
int i, ret = 0;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (res) {
|
|
size = resource_size(res);
|
|
start = res->start;
|
|
end = res->start + size;
|
|
for (i = 0; i < vdev_nums; i++) {
|
|
rpdev->ivdev[i].vring[0] = start;
|
|
rpdev->ivdev[i].vring[1] = start +
|
|
0x8000;
|
|
start += 0x10000;
|
|
if (start > end) {
|
|
pr_err("Too small memory size %x!\n",
|
|
(u32)size);
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void rpmsg_work_handler(struct work_struct *work)
|
|
{
|
|
u32 message;
|
|
unsigned long flags;
|
|
struct delayed_work *dwork = to_delayed_work(work);
|
|
struct imx_rpmsg_vproc *rpdev = container_of(dwork,
|
|
struct imx_rpmsg_vproc, rpmsg_work);
|
|
|
|
spin_lock_irqsave(&rpdev->mu_lock, flags);
|
|
/* handle all incoming mu message */
|
|
while (rpdev->in_idx != rpdev->out_idx) {
|
|
message = rpdev->m4_message[rpdev->out_idx % MAX_NUM];
|
|
spin_unlock_irqrestore(&rpdev->mu_lock, flags);
|
|
|
|
blocking_notifier_call_chain(&(rpdev->notifier), 4,
|
|
(void *)(phys_addr_t)message);
|
|
|
|
spin_lock_irqsave(&rpdev->mu_lock, flags);
|
|
rpdev->m4_message[rpdev->out_idx % MAX_NUM] = 0;
|
|
rpdev->out_idx++;
|
|
}
|
|
spin_unlock_irqrestore(&rpdev->mu_lock, flags);
|
|
}
|
|
|
|
static irqreturn_t imx_mu_rpmsg_isr(int irq, void *param)
|
|
{
|
|
u32 irqs, message;
|
|
unsigned long flags;
|
|
struct imx_rpmsg_vproc *rpdev = (struct imx_rpmsg_vproc *)param;
|
|
|
|
irqs = MU_ReadStatus(rpdev->mu_base);
|
|
|
|
/* RPMSG */
|
|
if (irqs & (1 << 26)) {
|
|
spin_lock_irqsave(&rpdev->mu_lock, flags);
|
|
/* get message from receive buffer */
|
|
MU_ReceiveMsg(rpdev->mu_base, 1, &message);
|
|
rpdev->m4_message[rpdev->in_idx % MAX_NUM] = message;
|
|
rpdev->in_idx++;
|
|
/*
|
|
* Too many mu message not be handled in timely, can enlarge
|
|
* MAX_NUM
|
|
*/
|
|
if (rpdev->in_idx == rpdev->out_idx) {
|
|
spin_unlock_irqrestore(&rpdev->mu_lock, flags);
|
|
pr_err("MU overflow!\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
spin_unlock_irqrestore(&rpdev->mu_lock, flags);
|
|
|
|
schedule_delayed_work(&(rpdev->rpmsg_work), 0);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int imx_rpmsg_mu_init(struct imx_rpmsg_vproc *rpdev)
|
|
{
|
|
int ret = 0;
|
|
|
|
/*
|
|
* bit26 is used by rpmsg channels.
|
|
* bit0 of MX7ULP_MU_CR used to let m4 to know MU is ready now
|
|
*/
|
|
MU_Init(rpdev->mu_base);
|
|
if (rpdev->variant == IMX7ULP) {
|
|
MU_EnableRxFullInt(rpdev->mu_base, 1);
|
|
ret = MU_SetFn(rpdev->mu_base, 1);
|
|
} else {
|
|
MU_EnableRxFullInt(rpdev->mu_base, 1);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
static int imx_rpmsg_probe(struct platform_device *pdev)
|
|
{
|
|
int core_id, j, ret = 0;
|
|
u32 irq;
|
|
struct device_node *np_mu;
|
|
struct device *dev = &pdev->dev;
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct imx_rpmsg_vproc *rpdev;
|
|
|
|
if (of_property_read_u32(np, "multi-core-id", &core_id))
|
|
core_id = 0;
|
|
rpdev = &imx_rpmsg_vprocs[core_id];
|
|
rpdev->core_id = core_id;
|
|
rpdev->variant = (enum imx_rpmsg_variants)of_device_get_match_data(dev);
|
|
|
|
/* Initialize the mu unit used by rpmsg */
|
|
if (rpdev->core_id == 1)
|
|
np_mu = of_find_compatible_node(NULL, NULL,
|
|
"fsl,imx-mu-rpmsg1");
|
|
else
|
|
np_mu = of_find_compatible_node(NULL, NULL, "fsl,imx6sx-mu");
|
|
if (!np_mu) {
|
|
pr_info("Cannot find MU-RPMSG entry in device tree\n");
|
|
return -EINVAL;
|
|
}
|
|
rpdev->mu_base = of_iomap(np_mu, 0);
|
|
WARN_ON(!rpdev->mu_base);
|
|
|
|
spin_lock_init(&rpdev->mu_lock);
|
|
|
|
if (rpdev->variant == IMX7ULP)
|
|
irq = of_irq_get(np_mu, 1);
|
|
else
|
|
irq = of_irq_get(np_mu, 0);
|
|
|
|
ret = request_irq(irq, imx_mu_rpmsg_isr,
|
|
IRQF_EARLY_RESUME | IRQF_SHARED,
|
|
"imx-mu-rpmsg", rpdev);
|
|
if (ret) {
|
|
pr_err("%s: register interrupt %d failed, rc %d\n",
|
|
__func__, irq, ret);
|
|
return ret;
|
|
}
|
|
|
|
if (rpdev->variant == IMX7D || rpdev->variant == IMX8QXP
|
|
|| rpdev->variant == IMX8QM) {
|
|
rpdev->mu_clk = of_clk_get(np_mu, 0);
|
|
if (IS_ERR(rpdev->mu_clk)) {
|
|
pr_err("mu clock source missing or invalid\n");
|
|
return PTR_ERR(rpdev->mu_clk);
|
|
}
|
|
ret = clk_prepare_enable(rpdev->mu_clk);
|
|
if (ret) {
|
|
pr_err("unable to enable mu clock\n");
|
|
return ret;
|
|
}
|
|
} else {
|
|
rpdev->mu_clk = NULL;
|
|
}
|
|
|
|
ret = imx_rpmsg_mu_init(rpdev);
|
|
if (ret) {
|
|
pr_err("unable to initialize mu module.\n");
|
|
return ret;
|
|
}
|
|
INIT_DELAYED_WORK(&(rpdev->rpmsg_work), rpmsg_work_handler);
|
|
BLOCKING_INIT_NOTIFIER_HEAD(&(rpdev->notifier));
|
|
|
|
pr_info("MU is ready for cross core communication!\n");
|
|
|
|
ret = of_property_read_u32(np, "vdev-nums", &rpdev->vdev_nums);
|
|
if (ret)
|
|
rpdev->vdev_nums = 1;
|
|
if (rpdev->vdev_nums > MAX_VDEV_NUMS) {
|
|
pr_err("vdev-nums exceed the max %d\n", MAX_VDEV_NUMS);
|
|
return -EINVAL;
|
|
}
|
|
rpdev->first_notify = rpdev->vdev_nums;
|
|
|
|
if (!strcmp(rpdev->rproc_name, "m4")) {
|
|
ret = set_vring_phy_buf(pdev, rpdev,
|
|
rpdev->vdev_nums);
|
|
if (ret) {
|
|
pr_err("No vring buffer.\n");
|
|
return -ENOMEM;
|
|
}
|
|
} else {
|
|
pr_err("No remote m4 processor.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
for (j = 0; j < rpdev->vdev_nums; j++) {
|
|
pr_debug("%s rpdev%d vdev%d: vring0 0x%x, vring1 0x%x\n",
|
|
__func__, rpdev->core_id, rpdev->vdev_nums,
|
|
rpdev->ivdev[j].vring[0],
|
|
rpdev->ivdev[j].vring[1]);
|
|
rpdev->ivdev[j].vdev.id.device = VIRTIO_ID_RPMSG;
|
|
rpdev->ivdev[j].vdev.config = &imx_rpmsg_config_ops;
|
|
rpdev->ivdev[j].vdev.dev.parent = &pdev->dev;
|
|
rpdev->ivdev[j].vdev.dev.release = imx_rpmsg_vproc_release;
|
|
rpdev->ivdev[j].base_vq_id = j * 2;
|
|
|
|
ret = register_virtio_device(&rpdev->ivdev[j].vdev);
|
|
if (ret) {
|
|
pr_err("%s failed to register rpdev: %d\n",
|
|
__func__, ret);
|
|
return ret;
|
|
}
|
|
|
|
}
|
|
platform_set_drvdata(pdev, rpdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int imx_rpmsg_suspend(struct device *dev)
|
|
{
|
|
struct imx_rpmsg_vproc *rpdev = dev_get_drvdata(dev);
|
|
|
|
clk_disable_unprepare(rpdev->mu_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_rpmsg_resume(struct device *dev)
|
|
{
|
|
struct imx_rpmsg_vproc *rpdev = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(rpdev->mu_clk);
|
|
if (ret) {
|
|
pr_err("unable to enable mu clock\n");
|
|
return ret;
|
|
}
|
|
|
|
return imx_rpmsg_mu_init(rpdev);
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(imx_rpmsg_pm_ops, imx_rpmsg_suspend, imx_rpmsg_resume);
|
|
|
|
static struct platform_driver imx_rpmsg_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "imx-rpmsg",
|
|
.of_match_table = imx_rpmsg_dt_ids,
|
|
.pm = &imx_rpmsg_pm_ops,
|
|
},
|
|
.probe = imx_rpmsg_probe,
|
|
};
|
|
|
|
static int __init imx_rpmsg_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = platform_driver_register(&imx_rpmsg_driver);
|
|
if (ret)
|
|
pr_err("Unable to initialize rpmsg driver\n");
|
|
else
|
|
pr_info("imx rpmsg driver is registered.\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
|
|
MODULE_DESCRIPTION("iMX remote processor messaging virtio device");
|
|
MODULE_LICENSE("GPL v2");
|
|
subsys_initcall(imx_rpmsg_init);
|