bcma: detect PCI core working in hostmode

We must not init it like clientmode one, it would break device (tested
by Hauke on BCM4718). Add stub hostmode driver for now.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

5 files changed, 62 insertions, 1 deletions

diff --git a/drivers/bcma/Kconfig b/drivers/bcma/Kconfig
index 83e9adf46441..ae0a02e1b808 100644
--- a/drivers/bcma/Kconfig
+++ b/drivers/bcma/Kconfig
@@ -27,6 +27,12 @@ config BCMA_HOST_PCI
         bool "Support for BCMA on PCI-host bus"
         depends on BCMA_HOST_PCI_POSSIBLE
 
+config BCMA_DRIVER_PCI_HOSTMODE
+        bool "Driver for PCI core working in hostmode"
+        depends on BCMA && MIPS
+        help
+          PCI core hostmode operation (external PCI bus).
+
 config BCMA_DEBUG
         bool "BCMA debugging"
         depends on BCMA
diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile
index cde0182bd1dc..a2161cceafb9 100644
--- a/drivers/bcma/Makefile
+++ b/drivers/bcma/Makefile
@@ -1,6 +1,7 @@
 bcma-y                                  += main.o scan.o core.o sprom.o
 bcma-y                                  += driver_chipcommon.o driver_chipcommon_pmu.o
 bcma-y                                  += driver_pci.o
+bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE) += driver_pci_host.o
 bcma-$(CONFIG_BCMA_HOST_PCI)            += host_pci.o
 obj-$(CONFIG_BCMA)                      += bcma.o
 
diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index 4228736de0e8..e02ff21835c9 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -28,4 +28,8 @@ extern int __init bcma_host_pci_init(void);
 extern void __exit bcma_host_pci_exit(void);
 #endif /* CONFIG_BCMA_HOST_PCI */
 
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+void bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc);
+#endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
+
 #endif
diff --git a/drivers/bcma/driver_pci.c b/drivers/bcma/driver_pci.c
index b0c19ede0d2e..dc6f34ac96a0 100644
--- a/drivers/bcma/driver_pci.c
+++ b/drivers/bcma/driver_pci.c
@@ -157,11 +157,47 @@ static void bcma_pcicore_serdes_workaround(struct bcma_drv_pci *pc)
  * Init.
  **************************************************/
 
-void bcma_core_pci_init(struct bcma_drv_pci *pc)
+static void bcma_core_pci_clientmode_init(struct bcma_drv_pci *pc)
 {
         bcma_pcicore_serdes_workaround(pc);
 }
 
+static bool bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc)
+{
+        struct bcma_bus *bus = pc->core->bus;
+        u16 chipid_top;
+
+        chipid_top = (bus->chipinfo.id & 0xFF00);
+        if (chipid_top != 0x4700 &&
+            chipid_top != 0x5300)
+                return false;
+
+        if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
+                return false;
+
+#if 0
+        /* TODO: on BCMA we use address from EROM instead of magic formula */
+        u32 tmp;
+        return !mips_busprobe32(tmp, (bus->mmio +
+                (pc->core->core_index * BCMA_CORE_SIZE)));
+#endif
+
+        return true;
+}
+
+void bcma_core_pci_init(struct bcma_drv_pci *pc)
+{
+        if (bcma_core_pci_is_in_hostmode(pc)) {
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+                bcma_core_pci_hostmode_init(pc);
+#else
+                pr_err("Driver compiled without support for hostmode PCI\n");
+#endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
+        } else {
+                bcma_core_pci_clientmode_init(pc);
+        }
+}
+
 int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,
                           bool enable)
 {
diff --git a/drivers/bcma/driver_pci_host.c b/drivers/bcma/driver_pci_host.c
new file mode 100644
index 000000000000..eb332b75ce83
--- /dev/null
+++ b/drivers/bcma/driver_pci_host.c
@@ -0,0 +1,14 @@
+/*
+ * Broadcom specific AMBA
+ * PCI Core in hostmode
+ *
+ * Licensed under the GNU/GPL. See COPYING for details.
+ */
+
+#include "bcma_private.h"
+#include <linux/bcma/bcma.h>
+
+void bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc)
+{
+        pr_err("No support for PCI core in hostmode yet\n");
+}