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mailbox: mpfs: account for mbox offsets while sending 

The mailbox offset is not only used for receiving messages, but it is
also used by messages sent to the system controller by Linux that have a
payload, such as the "digital signature service". It is also overloaded
by certain other services (reprogramming of the FPGA fabric, see Link:)
to have a meaning other than the offset the system controller should
read from.
When the driver was written, no such services of the latter type were
in use & those of the former used an offset of zero so this has gone
un-noticed.

Link: https://www.microsemi.com/document-portal/doc_download/1245815-polarfire-fpga-and-polarfire-soc-fpga-system-services-user-guide # Section 5.2
Fixes: 83d7b15608 ("mbox: add polarfire soc system controller mailbox")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
This commit is contained in:
Conor Dooley 2022-08-24 08:08:12 +01:00 committed by Jassi Brar
parent 2e10289d1f
commit 0d1aadfe10
1 changed files with 3 additions and 4 deletions
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7
drivers/mailbox/mailbox-mpfs.c
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@ -100,21 +100,20 @@ static int mpfs_mbox_send_data(struct mbox_chan *chan, void *data)
for (index = 0; index < (msg->cmd_data_size / 4); index++)
writel_relaxed(word_buf[index],
mbox->mbox_base + index * 0x4);
mbox->mbox_base + msg->mbox_offset + index * 0x4);
if (extra_bits) {
u8 i;
u8 byte_off = ALIGN_DOWN(msg->cmd_data_size, 4);
u8 *byte_buf = msg->cmd_data + byte_off;
val = readl_relaxed(mbox->mbox_base + index * 0x4);
val = readl_relaxed(mbox->mbox_base + msg->mbox_offset + index * 0x4);
for (i = 0u; i < extra_bits; i++) {
val &= ~(0xffu << (i * 8u));
val |= (byte_buf[i] << (i * 8u));
}
writel_relaxed(val,
mbox->mbox_base + index * 0x4);
writel_relaxed(val, mbox->mbox_base + msg->mbox_offset + index * 0x4);
}
}