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rpmsg: glink: Associate indirections for pipe fifo accessor's

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With the intention of reusing the glink core protocol commands and code
across both rpm and smem based transports, the only thing different is
way of accessing the shared-memory of the transport (FIFO). So put the
fifo accessor's of the transport's pipe (rx/tx) behind indirections, so
that the rest of the code can be shared.

For this, have a qcom_glink_pipe that can be used in the common code
containing the indirections and wrap it with glink_rpm_pipe that
contains the transport specific members.

Acked-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Bjorn Andersson 2017-08-24 12:51:24 +05:30
parent d7101feb69
commit e45c5dc26d
1 changed files with 106 additions and 38 deletions
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144
drivers/rpmsg/qcom_glink_rpm.c
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@ -41,12 +41,28 @@
#define RPM_GLINK_CID_MIN 1
#define RPM_GLINK_CID_MAX 65536
#define to_rpm_pipe(p) container_of(p, struct glink_rpm_pipe, native)
struct rpm_toc_entry {
__le32 id;
__le32 offset;
__le32 size;
} __packed;
struct qcom_glink;
struct qcom_glink_pipe {
size_t length;
size_t (*avail)(struct qcom_glink_pipe *glink_pipe);
void (*peak)(struct qcom_glink_pipe *glink_pipe, void *data,
size_t count);
void (*advance)(struct qcom_glink_pipe *glink_pipe, size_t count);
void (*write)(struct qcom_glink_pipe *glink_pipe,
const void *hdr, size_t hlen,
const void *data, size_t dlen);
};
struct rpm_toc {
__le32 magic;
__le32 count;
@ -62,12 +78,12 @@ struct glink_msg {
} __packed;
struct glink_rpm_pipe {
struct qcom_glink_pipe native;
void __iomem *tail;
void __iomem *head;
void __iomem *fifo;
size_t length;
};
/**
@ -107,8 +123,8 @@ struct qcom_glink {
struct mbox_client mbox_client;
struct mbox_chan *mbox_chan;
struct glink_rpm_pipe rx_pipe;
struct glink_rpm_pipe tx_pipe;
struct qcom_glink_pipe *rx_pipe;
struct qcom_glink_pipe *tx_pipe;
int irq;
@ -215,9 +231,9 @@ static void qcom_glink_channel_release(struct kref *ref)
kfree(channel);
}
static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
static size_t glink_rpm_rx_avail(struct qcom_glink_pipe *glink_pipe)
{
struct glink_rpm_pipe *pipe = &glink->rx_pipe;
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
unsigned int head;
unsigned int tail;
@ -225,21 +241,26 @@ static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
tail = readl(pipe->tail);
if (head < tail)
return pipe->length - tail + head;
return pipe->native.length - tail + head;
else
return head - tail;
}
static void qcom_glink_rx_peak(struct qcom_glink *glink,
void *data, size_t count)
static size_t qcom_glink_rx_avail(struct qcom_glink *glink)
{
struct glink_rpm_pipe *pipe = &glink->rx_pipe;
return glink->rx_pipe->avail(glink->rx_pipe);
}
static void glink_rpm_rx_peak(struct qcom_glink_pipe *glink_pipe,
void *data, size_t count)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
unsigned int tail;
size_t len;
tail = readl(pipe->tail);
len = min_t(size_t, count, pipe->length - tail);
len = min_t(size_t, count, pipe->native.length - tail);
if (len) {
__ioread32_copy(data, pipe->fifo + tail,
len / sizeof(u32));
@ -251,24 +272,35 @@ static void qcom_glink_rx_peak(struct qcom_glink *glink,
}
}
static void qcom_glink_rx_advance(struct qcom_glink *glink,
size_t count)
static void qcom_glink_rx_peak(struct qcom_glink *glink,
void *data, size_t count)
{
struct glink_rpm_pipe *pipe = &glink->rx_pipe;
glink->rx_pipe->peak(glink->rx_pipe, data, count);
}
static void glink_rpm_rx_advance(struct qcom_glink_pipe *glink_pipe,
size_t count)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
unsigned int tail;
tail = readl(pipe->tail);
tail += count;
if (tail >= pipe->length)
tail -= pipe->length;
if (tail >= pipe->native.length)
tail -= pipe->native.length;
writel(tail, pipe->tail);
}
static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
static void qcom_glink_rx_advance(struct qcom_glink *glink, size_t count)
{
struct glink_rpm_pipe *pipe = &glink->tx_pipe;
glink->rx_pipe->advance(glink->rx_pipe, count);
}
static size_t glink_rpm_tx_avail(struct qcom_glink_pipe *glink_pipe)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
unsigned int head;
unsigned int tail;
@ -276,19 +308,23 @@ static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
tail = readl(pipe->tail);
if (tail <= head)
return pipe->length - head + tail;
return pipe->native.length - head + tail;
else
return tail - head;
}
static unsigned int qcom_glink_tx_write(struct qcom_glink *glink,
unsigned int head,
const void *data, size_t count)
static size_t qcom_glink_tx_avail(struct qcom_glink *glink)
{
return glink->tx_pipe->avail(glink->tx_pipe);
}
static unsigned int glink_rpm_tx_write_one(struct glink_rpm_pipe *pipe,
unsigned int head,
const void *data, size_t count)
{
struct glink_rpm_pipe *pipe = &glink->tx_pipe;
size_t len;
len = min_t(size_t, count, pipe->length - head);
len = min_t(size_t, count, pipe->native.length - head);
if (len) {
__iowrite32_copy(pipe->fifo + head, data,
len / sizeof(u32));
@ -300,23 +336,41 @@ static unsigned int qcom_glink_tx_write(struct qcom_glink *glink,
}
head += count;
if (head >= pipe->length)
head -= pipe->length;
if (head >= pipe->native.length)
head -= pipe->native.length;
return head;
}
static void glink_rpm_tx_write(struct qcom_glink_pipe *glink_pipe,
const void *hdr, size_t hlen,
const void *data, size_t dlen)
{
struct glink_rpm_pipe *pipe = to_rpm_pipe(glink_pipe);
unsigned int head;
head = readl(pipe->head);
head = glink_rpm_tx_write_one(pipe, head, hdr, hlen);
head = glink_rpm_tx_write_one(pipe, head, data, dlen);
writel(head, pipe->head);
}
static void qcom_glink_tx_write(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen)
{
glink->tx_pipe->write(glink->tx_pipe, hdr, hlen, data, dlen);
}
static int qcom_glink_tx(struct qcom_glink *glink,
const void *hdr, size_t hlen,
const void *data, size_t dlen, bool wait)
{
struct glink_rpm_pipe *pipe = &glink->tx_pipe;
unsigned int head;
unsigned int tlen = hlen + dlen;
int ret;
/* Reject packets that are too big */
if (tlen >= glink->tx_pipe.length)
if (tlen >= glink->tx_pipe->length)
return -EINVAL;
if (WARN(tlen % 8, "Unaligned TX request"))
@ -335,10 +389,7 @@ static int qcom_glink_tx(struct qcom_glink *glink,
msleep(10);
}
head = readl(pipe->head);
head = qcom_glink_tx_write(glink, head, hdr, hlen);
head = qcom_glink_tx_write(glink, head, data, dlen);
writel(head, pipe->head);
qcom_glink_tx_write(glink, hdr, hlen, data, dlen);
mbox_send_message(glink->mbox_chan, NULL);
mbox_client_txdone(glink->mbox_chan, 0);
@ -1075,14 +1126,14 @@ static int glink_rpm_parse_toc(struct device *dev,
switch (id) {
case RPM_RX_FIFO_ID:
rx->length = size;
rx->native.length = size;
rx->tail = msg_ram + offset;
rx->head = msg_ram + offset + sizeof(u32);
rx->fifo = msg_ram + offset + 2 * sizeof(u32);
break;
case RPM_TX_FIFO_ID:
tx->length = size;
tx->native.length = size;
tx->tail = msg_ram + offset;
tx->head = msg_ram + offset + sizeof(u32);
@ -1107,6 +1158,8 @@ err_inval:
static int glink_rpm_probe(struct platform_device *pdev)
{
struct qcom_glink *glink;
struct glink_rpm_pipe *rx_pipe;
struct glink_rpm_pipe *tx_pipe;
struct device_node *np;
void __iomem *msg_ram;
size_t msg_ram_size;
@ -1121,6 +1174,11 @@ static int glink_rpm_probe(struct platform_device *pdev)
glink->dev = dev;
rx_pipe = devm_kzalloc(&pdev->dev, sizeof(*rx_pipe), GFP_KERNEL);
tx_pipe = devm_kzalloc(&pdev->dev, sizeof(*tx_pipe), GFP_KERNEL);
if (!rx_pipe || !tx_pipe)
return -ENOMEM;
mutex_init(&glink->tx_lock);
spin_lock_init(&glink->rx_lock);
INIT_LIST_HEAD(&glink->rx_queue);
@ -1150,12 +1208,22 @@ static int glink_rpm_probe(struct platform_device *pdev)
return -ENOMEM;
ret = glink_rpm_parse_toc(dev, msg_ram, msg_ram_size,
&glink->rx_pipe, &glink->tx_pipe);
rx_pipe, tx_pipe);
if (ret)
return ret;
writel(0, glink->tx_pipe.head);
writel(0, glink->rx_pipe.tail);
/* Pipe specific accessors */
rx_pipe->native.avail = glink_rpm_rx_avail;
rx_pipe->native.peak = glink_rpm_rx_peak;
rx_pipe->native.advance = glink_rpm_rx_advance;
tx_pipe->native.avail = glink_rpm_tx_avail;
tx_pipe->native.write = glink_rpm_tx_write;
glink->tx_pipe = &tx_pipe->native;
glink->rx_pipe = &rx_pipe->native;
writel(0, tx_pipe->head);
writel(0, rx_pipe->tail);
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(dev, irq,