bcma: support bringing up bus hosted on PCIe Gen 2

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

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

drivers/bcma/driver_pcie2.c

@@ -156,14 +156,23 @@ 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 = 1024;
+		break;
+	default:
+		pcie2->reqsize = 128;
+		break;
+	}
 
 	if (ci->id == BCMA_CHIP_ID_BCM4360 && ci->rev > 3)
 		bcma_core_pcie2_war_delay_perst_enab(pcie2, true);
@@ -173,3 +182,18 @@ 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;
+	int err;
+
+	err = pcie_set_readrq(dev, pcie2->reqsize);
+	if (err)
+		bcma_err(bus, "Error setting PCI_EXP_DEVCTL_READRQ: %d\n", err);
+}

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]);
 }

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)