bcma: add PCIe host controller

Some SoCs have a PCIe host controller to make it possible to attach
some other devices to it, like an other Wifi card.
This code was tested with an Netgear WNDR3400 (bcm4716 based), but
should work with all bcma based SoCs.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

arch/mips/pci/pci-bcm47xx.c

@@ -25,6 +25,7 @@
 #include <linux/types.h>
 #include <linux/pci.h>
 #include <linux/ssb/ssb.h>
+#include <linux/bcma/bcma.h>
 #include <bcm47xx.h>
 
 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
@@ -32,15 +33,12 @@ int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 	return 0;
 }
 
-int pcibios_plat_dev_init(struct pci_dev *dev)
-{
 #ifdef CONFIG_BCM47XX_SSB
+static int bcm47xx_pcibios_plat_dev_init_ssb(struct pci_dev *dev)
+{
 	int res;
 	u8 slot, pin;
 
-	if (bcm47xx_bus_type !=  BCM47XX_BUS_TYPE_SSB)
-		return 0;
-
 	res = ssb_pcibios_plat_dev_init(dev);
 	if (res < 0) {
 		printk(KERN_ALERT "PCI: Failed to init device %s\n",
@@ -60,6 +58,47 @@ int pcibios_plat_dev_init(struct pci_dev *dev)
 	}
 
 	dev->irq = res;
+	return 0;
+}
 #endif
+
+#ifdef CONFIG_BCM47XX_BCMA
+static int bcm47xx_pcibios_plat_dev_init_bcma(struct pci_dev *dev)
+{
+	int res;
+
+	res = bcma_core_pci_plat_dev_init(dev);
+	if (res < 0) {
+		printk(KERN_ALERT "PCI: Failed to init device %s\n",
+		       pci_name(dev));
+		return res;
+	}
+
+	res = bcma_core_pci_pcibios_map_irq(dev);
+
+	/* IRQ-0 and IRQ-1 are software interrupts. */
+	if (res < 2) {
+		printk(KERN_ALERT "PCI: Failed to map IRQ of device %s\n",
+		       pci_name(dev));
+		return res;
+	}
+
+	dev->irq = res;
 	return 0;
 }
+#endif
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+#ifdef CONFIG_BCM47XX_SSB
+	if (bcm47xx_bus_type ==  BCM47XX_BUS_TYPE_SSB)
+		return bcm47xx_pcibios_plat_dev_init_ssb(dev);
+	else
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	if  (bcm47xx_bus_type ==  BCM47XX_BUS_TYPE_BCMA)
+		return bcm47xx_pcibios_plat_dev_init_bcma(dev);
+	else
+#endif
+		return 0;
+}

drivers/bcma/bcma_private.h

@@ -52,6 +52,7 @@ extern void __exit bcma_host_pci_exit(void);
 u32 bcma_pcie_read(struct bcma_drv_pci *pc, u32 address);
 
 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+bool __devinit bcma_core_pci_is_in_hostmode(struct bcma_drv_pci *pc);
 void __devinit bcma_core_pci_hostmode_init(struct bcma_drv_pci *pc);
 #endif /* CONFIG_BCMA_DRIVER_PCI_HOSTMODE */
 

drivers/bcma/driver_pci.c

@@ -2,7 +2,7 @@
  * Broadcom specific AMBA
  * PCI Core
  *
- * Copyright 2005, Broadcom Corporation
+ * Copyright 2005, 2011, Broadcom Corporation
  * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
  * Copyright 2011, 2012, Hauke Mehrtens <hauke@hauke-m.de>
  *
@@ -179,47 +179,19 @@ static void __devinit bcma_core_pci_clientmode_init(struct bcma_drv_pci *pc)
 	bcma_pcicore_serdes_workaround(pc);
 }
 
-static bool __devinit 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;
-
-#ifdef CONFIG_SSB_DRIVER_PCICORE
-	if (bus->sprom.boardflags_lo & SSB_BFL_NOPCI)
-		return false;
-#endif /* CONFIG_SSB_DRIVER_PCICORE */
-
-#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 __devinit bcma_core_pci_init(struct bcma_drv_pci *pc)
 {
 	if (pc->setup_done)
 		return;
 
-	if (bcma_core_pci_is_in_hostmode(pc)) {
 #ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+	pc->hostmode = bcma_core_pci_is_in_hostmode(pc);
+	if (pc->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);
-	}
 
-	pc->setup_done = true;
+	if (!pc->hostmode)
+		bcma_core_pci_clientmode_init(pc);
 }
 
 int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc, struct bcma_device *core,

include/linux/bcma/bcma_driver_pci.h

@@ -160,9 +160,44 @@ struct pci_dev;
 /* PCIcore specific boardflags */
 #define BCMA_CORE_PCI_BFL_NOPCI			0x00000400 /* Board leaves PCI floating */
 
+/* PCIE Config space accessing MACROS */
+#define BCMA_CORE_PCI_CFG_BUS_SHIFT		24	/* Bus shift */
+#define BCMA_CORE_PCI_CFG_SLOT_SHIFT		19	/* Slot/Device shift */
+#define BCMA_CORE_PCI_CFG_FUN_SHIFT		16	/* Function shift */
+#define BCMA_CORE_PCI_CFG_OFF_SHIFT		0	/* Register shift */
+
+#define BCMA_CORE_PCI_CFG_BUS_MASK		0xff	/* Bus mask */
+#define BCMA_CORE_PCI_CFG_SLOT_MASK		0x1f	/* Slot/Device mask */
+#define BCMA_CORE_PCI_CFG_FUN_MASK		7	/* Function mask */
+#define BCMA_CORE_PCI_CFG_OFF_MASK		0xfff	/* Register mask */
+
+/* PCIE Root Capability Register bits (Host mode only) */
+#define BCMA_CORE_PCI_RC_CRS_VISIBILITY		0x0001
+
+struct bcma_drv_pci;
+
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+struct bcma_drv_pci_host {
+	struct bcma_drv_pci *pdev;
+
+	u32 host_cfg_addr;
+	spinlock_t cfgspace_lock;
+
+	struct pci_controller pci_controller;
+	struct pci_ops pci_ops;
+	struct resource mem_resource;
+	struct resource io_resource;
+};
+#endif
+
 struct bcma_drv_pci {
 	struct bcma_device *core;
 	u8 setup_done:1;
+	u8 hostmode:1;
+
+#ifdef CONFIG_BCMA_DRIVER_PCI_HOSTMODE
+	struct bcma_drv_pci_host *host_controller;
+#endif
 };
 
 /* Register access */
@@ -173,4 +208,7 @@ extern void __devinit bcma_core_pci_init(struct bcma_drv_pci *pc);
 extern int bcma_core_pci_irq_ctl(struct bcma_drv_pci *pc,
 				 struct bcma_device *core, bool enable);
 
+extern int bcma_core_pci_pcibios_map_irq(const struct pci_dev *dev);
+extern int bcma_core_pci_plat_dev_init(struct pci_dev *dev);
+
 #endif /* LINUX_BCMA_DRIVER_PCI_H_ */

include/linux/bcma/bcma_regs.h

@@ -56,4 +56,31 @@
 #define  BCMA_PCI_GPIO_XTAL		0x40	/* PCI config space GPIO 14 for Xtal powerup */
 #define  BCMA_PCI_GPIO_PLL		0x80	/* PCI config space GPIO 15 for PLL powerdown */
 
+/* SiliconBackplane Address Map.
+ * All regions may not exist on all chips.
+ */
+#define BCMA_SOC_SDRAM_BASE		0x00000000U	/* Physical SDRAM */
+#define BCMA_SOC_PCI_MEM		0x08000000U	/* Host Mode sb2pcitranslation0 (64 MB) */
+#define BCMA_SOC_PCI_MEM_SZ		(64 * 1024 * 1024)
+#define BCMA_SOC_PCI_CFG		0x0c000000U	/* Host Mode sb2pcitranslation1 (64 MB) */
+#define BCMA_SOC_SDRAM_SWAPPED		0x10000000U	/* Byteswapped Physical SDRAM */
+#define BCMA_SOC_SDRAM_R2		0x80000000U	/* Region 2 for sdram (512 MB) */
+
+
+#define BCMA_SOC_PCI_DMA		0x40000000U	/* Client Mode sb2pcitranslation2 (1 GB) */
+#define BCMA_SOC_PCI_DMA2		0x80000000U	/* Client Mode sb2pcitranslation2 (1 GB) */
+#define BCMA_SOC_PCI_DMA_SZ		0x40000000U	/* Client Mode sb2pcitranslation2 size in bytes */
+#define BCMA_SOC_PCIE_DMA_L32		0x00000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), low 32 bits
+							 */
+#define BCMA_SOC_PCIE_DMA_H32		0x80000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), high 32 bits
+							 */
+
+#define BCMA_SOC_PCI1_MEM		0x40000000U	/* Host Mode sb2pcitranslation0 (64 MB) */
+#define BCMA_SOC_PCI1_CFG		0x44000000U	/* Host Mode sb2pcitranslation1 (64 MB) */
+#define BCMA_SOC_PCIE1_DMA_H32		0xc0000000U	/* PCIE Client Mode sb2pcitranslation2
+							 * (2 ZettaBytes), high 32 bits
+							 */
+
 #endif /* LINUX_BCMA_REGS_H_ */