[PATCH 3/4] bcma: support bringing up bus hosted on PCIe Gen 2

["Rafał Miłecki" <zajec5@gmail.com>]

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
 drivers/bcma/bcma_private.h            |  3 +++
 drivers/bcma/driver_pcie2.c            | 24 ++++++++++++++++++++++--
 drivers/bcma/host_pci.c                |  2 +-
 include/linux/bcma/bcma_driver_pcie2.h |  2 ++
 4 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index 351f4af..3692912 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -104,6 +104,9 @@ u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address);
 void bcma_core_pci_up(struct bcma_drv_pci *pc);
 void bcma_core_pci_down(struct bcma_drv_pci *pc);
 
+/* driver_pcie2.c */
+void bcma_core_pcie2_up(struct bcma_drv_pcie2 *pcie2);
+
 extern int bcma_chipco_watchdog_register(struct bcma_drv_cc *cc);
 
 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
diff --git a/drivers/bcma/driver_pcie2.c b/drivers/bcma/driver_pcie2.c
index e4be537..c8913bc 100644
--- a/drivers/bcma/driver_pcie2.c
+++ b/drivers/bcma/driver_pcie2.c
@@ -156,14 +156,20 @@ static void pciedev_reg_pm_clk_period(struct bcma_drv_pcie2 *pcie2)
 
 void bcma_core_pcie2_init(struct bcma_drv_pcie2 *pcie2)
 {
-	struct bcma_chipinfo *ci = &pcie2->core->bus->chipinfo;
+	struct bcma_bus *bus = pcie2->core->bus;
+	struct bcma_chipinfo *ci = &bus->chipinfo;
 	u32 tmp;
 
 	tmp = pcie2_read32(pcie2, BCMA_CORE_PCIE2_SPROM(54));
 	if ((tmp & 0xe) >> 1 == 2)
 		bcma_core_pcie2_cfg_write(pcie2, 0x4e0, 0x17);
 
-	/* TODO: Do we need pcie_reqsize? */
+	switch (bus->chipinfo.id) {
+	case BCMA_CHIP_ID_BCM4360:
+	case BCMA_CHIP_ID_BCM4352:
+		pcie2->reqsize = 0x3000; /* TODO: PCI_EXP_DEVCTL_READRQ_1024B */
+		break;
+	}
 
 	if (ci->id == BCMA_CHIP_ID_BCM4360 && ci->rev > 3)
 		bcma_core_pcie2_war_delay_perst_enab(pcie2, true);
@@ -173,3 +179,17 @@ void bcma_core_pcie2_init(struct bcma_drv_pcie2 *pcie2)
 	pciedev_crwlpciegen2_180(pcie2);
 	pciedev_crwlpciegen2_182(pcie2);
 }
+
+/**************************************************
+ * Runtime ops.
+ **************************************************/
+
+void bcma_core_pcie2_up(struct bcma_drv_pcie2 *pcie2)
+{
+	struct bcma_bus *bus = pcie2->core->bus;
+	struct pci_dev *dev = bus->host_pci;
+
+	pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
+					   PCI_EXP_DEVCTL_READRQ,
+					   pcie2->reqsize);
+}
diff --git a/drivers/bcma/host_pci.c b/drivers/bcma/host_pci.c
index 8dd37dc..5fb87a8 100644
--- a/drivers/bcma/host_pci.c
+++ b/drivers/bcma/host_pci.c
@@ -322,7 +322,7 @@ void bcma_host_pci_up(struct bcma_bus *bus)
 		return;
 
 	if (bus->host_is_pcie2)
-		pr_warn("Bringing up bus with PCIe Gen 2 host is unsupported yet\n");
+		bcma_core_pcie2_up(&bus->drv_pcie2);
 	else
 		bcma_core_pci_up(&bus->drv_pci[0]);
 }
diff --git a/include/linux/bcma/bcma_driver_pcie2.h b/include/linux/bcma/bcma_driver_pcie2.h
index 5988b05..d8c4329 100644
--- a/include/linux/bcma/bcma_driver_pcie2.h
+++ b/include/linux/bcma/bcma_driver_pcie2.h
@@ -143,6 +143,8 @@
 
 struct bcma_drv_pcie2 {
 	struct bcma_device *core;
+
+	u16 reqsize;
 };
 
 #define pcie2_read16(pcie2, offset)		bcma_read16((pcie2)->core, offset)
-- 
1.8.4.5