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drivers: ddr: altera: Check IOSSM mailbox compatibility

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Compatibility check of IOSSM mailbox with U-Boot is performed
by verifying the mailbox specification version. If check fails,
appropriate error message is displayed.

Signed-off-by: Naresh Kumar Ravulapalli <nareshkumar.ravulapalli@altera.com>
Reviewed-by: Tien Fong Chee <tien.fong.chee@altera.com>
This commit is contained in:
Naresh Kumar Ravulapalli
2025-09-30 14:29:53 +08:00
committed by Tien Fong Chee
parent 3d084d91ed
commit 5d2ef97c66
1 changed files with 24 additions and 0 deletions
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drivers/ddr/altera/iossm_mailbox.c
+24
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@@ -38,6 +38,8 @@
#define IOSSM_STATUS_CMD_RESPONSE_ERROR(n) FIELD_GET(IOSSM_STATUS_CMD_RESPONSE_ERROR_MASK, n)
#define IOSSM_STATUS_GENERAL_ERROR_MASK GENMASK(4, 1)
#define IOSSM_STATUS_GENERAL_ERROR(n) FIELD_GET(IOSSM_STATUS_GENERAL_ERROR_MASK, n)
#define IOSSM_MAILBOX_SPEC_VERSION_MASK GENMASK(2, 0)
#define IOSSM_MAILBOX_SPEC_VERSION(n) FIELD_GET(IOSSM_MAILBOX_SPEC_VERSION_MASK, n)
/* Offset of Mailbox Read-only Registers */
#define IOSSM_MAILBOX_HEADER_OFFSET 0x0
@@ -383,6 +385,23 @@ err:
return ret;
}
static bool is_mailbox_spec_compatible(struct io96b_info *io96b_ctrl)
{
u32 mailbox_header;
u8 mailbox_spec_ver;
mailbox_header = readl(io96b_ctrl->io96b[0].io96b_csr_addr +
IOSSM_MAILBOX_HEADER_OFFSET);
mailbox_spec_ver = IOSSM_MAILBOX_SPEC_VERSION(mailbox_header);
printf("%s: IOSSM mailbox version: %d\n", __func__, mailbox_spec_ver);
/* for now there are two mailbox spec versions, 0 and 1; only version 1 is compatible */
if (!mailbox_spec_ver)
return false;
return true;
}
/*
* Initial function to be called to set memory interface IP type and instance ID
* IP type and instance ID need to be determined before sending mailbox command
@@ -392,6 +411,11 @@ void io96b_mb_init(struct io96b_info *io96b_ctrl)
int i, j;
u32 mem_intf_info_0, mem_intf_info_1;
if (!is_mailbox_spec_compatible(io96b_ctrl)) {
printf("DDR: Failed to get compatible mailbox version\n");
hang();
}
debug("%s: num_instance %d\n", __func__, io96b_ctrl->num_instance);
for (i = 0; i < io96b_ctrl->num_instance; i++) {