From e4d708702e6c98f2111e33201a264d6788564cb2 Mon Sep 17 00:00:00 2001
From: OpenWrt community <openwrt-devel@lists.openwrt.org>
Date: Fri, 12 May 2023 11:08:43 +0200
Subject: [PATCH] ssb_sprom: add generic kernel support for Broadcom  Fallback SPROMs

---
 drivers/bcma/Kconfig        |  4 ++++
 drivers/bcma/Makefile       |  1 +
 drivers/bcma/bcma_private.h |  4 ++++
 drivers/bcma/main.c         |  8 ++++++++
 drivers/bcma/sprom.c        | 23 ++++++++++++++---------
 drivers/ssb/Kconfig         |  5 +++++
 drivers/ssb/Makefile        |  1 +
 drivers/ssb/main.c          |  8 ++++++++
 drivers/ssb/sprom.c         | 12 +++++++++++-
 drivers/ssb/ssb_private.h   |  4 ++++
 10 files changed, 60 insertions(+), 10 deletions(-)

--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -18,6 +18,10 @@ config BCMA_BLOCKIO
 	bool
 	default y
 
+config BCMA_FALLBACK_SPROM
+	bool
+	default y
+
 config BCMA_HOST_PCI_POSSIBLE
 	bool
 	depends on PCI = y
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -11,6 +11,7 @@ bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE)
 bcma-$(CONFIG_BCMA_DRIVER_MIPS)		+= driver_mips.o
 bcma-$(CONFIG_BCMA_DRIVER_GMAC_CMN)	+= driver_gmac_cmn.o
 bcma-$(CONFIG_BCMA_DRIVER_GPIO)		+= driver_gpio.o
+bcma-$(CONFIG_BCMA_FALLBACK_SPROM)	+= fallback-sprom.o
 bcma-$(CONFIG_BCMA_HOST_PCI)		+= host_pci.o
 bcma-$(CONFIG_BCMA_HOST_SOC)		+= host_soc.o
 obj-$(CONFIG_BCMA)			+= bcma.o
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -38,6 +38,10 @@ int bcma_bus_resume(struct bcma_bus *bus
 void bcma_detect_chip(struct bcma_bus *bus);
 int bcma_bus_scan(struct bcma_bus *bus);
 
+/* fallback-sprom.c */
+int __init bcma_fbs_register(void);
+int bcma_get_fallback_sprom(struct bcma_bus *dev, struct ssb_sprom *out);
+
 /* sprom.c */
 int bcma_sprom_get(struct bcma_bus *bus);
 
--- a/drivers/bcma/main.c
+++ b/drivers/bcma/main.c
@@ -671,6 +671,14 @@ static int __init bcma_modinit(void)
 {
 	int err;
 
+#ifdef CONFIG_BCMA_FALLBACK_SPROM
+	err = bcma_fbs_register();
+	if (err) {
+		pr_err("Fallback SPROM initialization failed\n");
+		err = 0;
+	}
+#endif /* CONFIG_BCMA_FALLBACK_SPROM */
+
 	err = bcma_init_bus_register();
 	if (err)
 		return err;
--- a/drivers/bcma/sprom.c
+++ b/drivers/bcma/sprom.c
@@ -51,21 +51,26 @@ static int bcma_fill_sprom_with_fallback
 {
 	int err;
 
-	if (!get_fallback_sprom) {
+	if (get_fallback_sprom)
+		err = get_fallback_sprom(bus, out);
+
+#ifdef CONFIG_BCMA_FALLBACK_SPROM
+	if (!get_fallback_sprom || err)
+		err = bcma_get_fallback_sprom(bus, out);
+#else
+	if (!get_fallback_sprom)
 		err = -ENOENT;
-		goto fail;
-	}
+#endif /* CONFIG_BCMA_FALLBACK_SPROM */
 
-	err = get_fallback_sprom(bus, out);
-	if (err)
-		goto fail;
+	if (err) {
+		bcma_warn(bus, "Using fallback SPROM failed (err %d)\n", err);
+		return err;
+	}
 
 	bcma_debug(bus, "Using SPROM revision %d provided by platform.\n",
 		   bus->sprom.revision);
+
 	return 0;
-fail:
-	bcma_warn(bus, "Using fallback SPROM failed (err %d)\n", err);
-	return err;
 }
 
 /**************************************************
--- a/drivers/ssb/Kconfig
+++ b/drivers/ssb/Kconfig
@@ -25,6 +25,11 @@ if SSB
 config SSB_SPROM
 	bool
 
+config SSB_FALLBACK_SPROM
+	bool
+	depends on SSB_PCIHOST
+	default y
+
 # Support for Block-I/O. SELECT this from the driver that needs it.
 config SSB_BLOCKIO
 	bool
--- a/drivers/ssb/Makefile
+++ b/drivers/ssb/Makefile
@@ -2,6 +2,7 @@
 # core
 ssb-y					+= main.o scan.o
 ssb-$(CONFIG_SSB_EMBEDDED)		+= embedded.o
+ssb-$(CONFIG_SSB_FALLBACK_SPROM)	+= fallback-sprom.o
 ssb-$(CONFIG_SSB_SPROM)			+= sprom.o
 
 # host support
--- a/drivers/ssb/main.c
+++ b/drivers/ssb/main.c
@@ -1287,6 +1287,14 @@ static int __init ssb_modinit(void)
 {
 	int err;
 
+#ifdef CONFIG_SSB_FALLBACK_SPROM
+	err = ssb_fbs_register();
+	if (err) {
+		pr_err("Fallback SPROM initialization failed\n");
+		err = 0;
+	}
+#endif /* CONFIG_SSB_FALLBACK_SPROM */
+
 	/* See the comment at the ssb_is_early_boot definition */
 	ssb_is_early_boot = 0;
 	err = bus_register(&ssb_bustype);
--- a/drivers/ssb/sprom.c
+++ b/drivers/ssb/sprom.c
@@ -180,10 +180,20 @@ int ssb_arch_register_fallback_sprom(int
 
 int ssb_fill_sprom_with_fallback(struct ssb_bus *bus, struct ssb_sprom *out)
 {
+	int err;
+
+	if (get_fallback_sprom)
+		err = get_fallback_sprom(bus, out);
+
+#ifdef CONFIG_SSB_FALLBACK_SPROM
+	if (!get_fallback_sprom || err)
+		err = ssb_get_fallback_sprom(bus, out);
+#else
 	if (!get_fallback_sprom)
 		return -ENOENT;
+#endif /* CONFIG_SSB_FALLBACK_SPROM */
 
-	return get_fallback_sprom(bus, out);
+	return err;
 }
 
 /* https://bcm-v4.sipsolutions.net/802.11/IsSpromAvailable */
--- a/drivers/ssb/ssb_private.h
+++ b/drivers/ssb/ssb_private.h
@@ -143,6 +143,10 @@ extern int ssb_bus_scan(struct ssb_bus *
 extern void ssb_iounmap(struct ssb_bus *ssb);
 
 
+/* fallback-sprom.c */
+int __init ssb_fbs_register(void);
+int ssb_get_fallback_sprom(struct ssb_bus *dev, struct ssb_sprom *out);
+
 /* sprom.c */
 extern
 ssize_t ssb_attr_sprom_show(struct ssb_bus *bus, char *buf,