@@ -17,6 +17,9 @@
#define PRESTERA_SUPP_FW_MAJ_VER 3
#define PRESTERA_SUPP_FW_MIN_VER 0
+#define PRESTERA_PREV_FW_MAJ_VER 2
+#define PRESTERA_PREV_FW_MIN_VER 0
+
#define PRESTERA_FW_PATH_FMT "mrvl/prestera/mvsw_prestera_fw-v%u.%u.img"
#define PRESTERA_FW_HDR_MAGIC 0x351D9D06
@@ -172,6 +175,8 @@ struct prestera_fw_evtq {
};
struct prestera_fw {
+ struct prestera_fw_rev rev_supp;
+ const struct firmware *bin;
struct workqueue_struct *wq;
struct prestera_device dev;
u8 __iomem *ldr_regs;
@@ -595,25 +600,24 @@ static void prestera_fw_rev_parse(const struct prestera_fw_header *hdr,
static int prestera_fw_rev_check(struct prestera_fw *fw)
{
struct prestera_fw_rev *rev = &fw->dev.fw_rev;
- u16 maj_supp = PRESTERA_SUPP_FW_MAJ_VER;
- u16 min_supp = PRESTERA_SUPP_FW_MIN_VER;
- if (rev->maj == maj_supp && rev->min >= min_supp)
+ if (rev->maj == fw->rev_supp.maj && rev->min >= fw->rev_supp.min)
return 0;
dev_err(fw->dev.dev, "Driver supports FW version only '%u.%u.x'",
- PRESTERA_SUPP_FW_MAJ_VER, PRESTERA_SUPP_FW_MIN_VER);
+ fw->rev_supp.maj, fw->rev_supp.min);
return -EINVAL;
}
-static int prestera_fw_hdr_parse(struct prestera_fw *fw,
- const struct firmware *img)
+static int prestera_fw_hdr_parse(struct prestera_fw *fw)
{
- struct prestera_fw_header *hdr = (struct prestera_fw_header *)img->data;
struct prestera_fw_rev *rev = &fw->dev.fw_rev;
+ struct prestera_fw_header *hdr;
u32 magic;
+ hdr = (struct prestera_fw_header *)fw->bin->data;
+
magic = be32_to_cpu(hdr->magic_number);
if (magic != PRESTERA_FW_HDR_MAGIC) {
dev_err(fw->dev.dev, "FW img hdr magic is invalid");
@@ -628,11 +632,52 @@ static int prestera_fw_hdr_parse(struct prestera_fw *fw,
return prestera_fw_rev_check(fw);
}
+static int prestera_fw_get(struct prestera_fw *fw)
+{
+ int ver_maj = PRESTERA_SUPP_FW_MAJ_VER;
+ int ver_min = PRESTERA_SUPP_FW_MIN_VER;
+ char fw_path[128];
+ int err;
+
+pick_fw_ver:
+ snprintf(fw_path, sizeof(fw_path), PRESTERA_FW_PATH_FMT,
+ ver_maj, ver_min);
+
+ err = request_firmware_direct(&fw->bin, fw_path, fw->dev.dev);
+ if (err) {
+ if (ver_maj == PRESTERA_SUPP_FW_MAJ_VER) {
+ ver_maj = PRESTERA_PREV_FW_MAJ_VER;
+ ver_min = PRESTERA_PREV_FW_MIN_VER;
+
+ dev_warn(fw->dev.dev,
+ "missing latest %s firmware, fall-back to previous %u.%u version\n",
+ fw_path, ver_maj, ver_min);
+
+ goto pick_fw_ver;
+ } else {
+ dev_err(fw->dev.dev, "failed to request previous firmware: %s\n",
+ fw_path);
+ return err;
+ }
+ }
+
+ dev_info(fw->dev.dev, "Loading %s ...", fw_path);
+
+ fw->rev_supp.maj = ver_maj;
+ fw->rev_supp.min = ver_min;
+ fw->rev_supp.sub = 0;
+
+ return 0;
+}
+
+static void prestera_fw_put(struct prestera_fw *fw)
+{
+ release_firmware(fw->bin);
+}
+
static int prestera_fw_load(struct prestera_fw *fw)
{
size_t hlen = sizeof(struct prestera_fw_header);
- const struct firmware *f;
- char fw_path[128];
int err;
err = prestera_ldr_wait_reg32(fw, PRESTERA_LDR_READY_REG,
@@ -651,30 +696,24 @@ static int prestera_fw_load(struct prestera_fw *fw)
fw->ldr_wr_idx = 0;
- snprintf(fw_path, sizeof(fw_path), PRESTERA_FW_PATH_FMT,
- PRESTERA_SUPP_FW_MAJ_VER, PRESTERA_SUPP_FW_MIN_VER);
-
- err = request_firmware_direct(&f, fw_path, fw->dev.dev);
- if (err) {
- dev_err(fw->dev.dev, "failed to request firmware file\n");
+ err = prestera_fw_get(fw);
+ if (err)
return err;
- }
- err = prestera_fw_hdr_parse(fw, f);
+ err = prestera_fw_hdr_parse(fw);
if (err) {
dev_err(fw->dev.dev, "FW image header is invalid\n");
goto out_release;
}
- prestera_ldr_write(fw, PRESTERA_LDR_IMG_SIZE_REG, f->size - hlen);
+ prestera_ldr_write(fw, PRESTERA_LDR_IMG_SIZE_REG, fw->bin->size - hlen);
prestera_ldr_write(fw, PRESTERA_LDR_CTL_REG, PRESTERA_LDR_CTL_DL_START);
- dev_info(fw->dev.dev, "Loading %s ...", fw_path);
-
- err = prestera_ldr_fw_send(fw, f->data + hlen, f->size - hlen);
+ err = prestera_ldr_fw_send(fw, fw->bin->data + hlen,
+ fw->bin->size - hlen);
out_release:
- release_firmware(f);
+ prestera_fw_put(fw);
return err;
}