[PATCH 2/2] PCI: iproc: add bcma pcie driver

[Hauke Mehrtens]

This driver adds support for the PCIe 2.0 controller found on the bcma
bus. This controller can be found on (mostly) all Broadcom BCM470X /
BCM5301X ARM SoCs.

The driver found in the Broadcom SDK does some more stuff, like setting
up some DMA memory areas, chaining MPS and MRRS to 512 and also some
PHY changes like "improving" the PCIe jitter and doing some special
initializations for the 3rd PCIe port.

This was tested on a bcm4708 board with 2 PCIe ports and wireless cards
connected to them.

PCI_DOMAINS is needed by this driver, because normally there is more
than one PCIe controller and without PCI_DOMAINS only the first
controller gets registered.
This controller gets 6 IRQs, the last one is trigged by all IRQ events.

Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 drivers/pci/host/Kconfig           |  11 ++++
 drivers/pci/host/Makefile          |   1 +
 drivers/pci/host/pcie-iproc-bcma.c | 112 +++++++++++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 drivers/pci/host/pcie-iproc-bcma.c

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 1dfb567..f23f96d 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -125,4 +125,15 @@ config PCIE_IPROC_PLATFORM
 	  Say Y here if you want to use the Broadcom iProc PCIe controller
 	  through the generic platform bus interface
 
+config PCIE_IPROC_BCMA
+	bool "Broadcom iProc PCIe bcma bus driver"
+	depends on ARCH_BCM_IPROC || (ARM && COMPILE_TEST)
+	select PCIE_IPROC
+	select BCMA
+	select PCI_DOMAINS
+	default ARCH_BCM_5301X
+	help
+	  Say Y here if you want to use the Broadcom iProc PCIe controller
+	  through the bcma bus interface
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index f733b4e..2f7c36f 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -15,3 +15,4 @@ obj-$(CONFIG_PCI_LAYERSCAPE) += pci-layerscape.o
 obj-$(CONFIG_PCI_VERSATILE) += pci-versatile.o
 obj-$(CONFIG_PCIE_IPROC) += pcie-iproc.o
 obj-$(CONFIG_PCIE_IPROC_PLATFORM) += pcie-iproc-platform.o
+obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
diff --git a/drivers/pci/host/pcie-iproc-bcma.c b/drivers/pci/host/pcie-iproc-bcma.c
new file mode 100644
index 0000000..c318f19
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc-bcma.c
@@ -0,0 +1,112 @@
+/* 
+ * Copyright (C) 2015 Broadcom Corporation
+ * Copyright (C) 2015 Hauke Mehrtens <hauke at hauke-m.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/phy/phy.h>
+#include <linux/bcma/bcma.h>
+#include <linux/ioport.h>
+
+#include "pcie-iproc.h"
+
+
+/* NS: CLASS field is R/O, and set to wrong 0x200 value */
+static void bcma_pcie2_fixup_class(struct pci_dev *dev)
+{
+	dev->class = PCI_CLASS_BRIDGE_PCI << 8;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
+
+static int iproc_pcie_bcma_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct pci_sys_data *sys = dev->sysdata;
+	struct iproc_pcie *pcie = sys->private_data;
+	struct bcma_device *bdev = container_of(pcie->dev, struct bcma_device, dev);
+
+	return bcma_core_irq(bdev, 5);
+}
+
+static int iproc_pcie_bcma_probe(struct bcma_device *bdev)
+{
+	struct iproc_pcie *pcie;
+	LIST_HEAD(res);
+	struct resource res_mem;
+	int ret;
+
+	pcie = devm_kzalloc(&bdev->dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	pcie->dev = &bdev->dev;
+	bcma_set_drvdata(bdev, pcie);
+
+	pcie->base = bdev->io_addr;
+
+	res_mem.start = bdev->addr_s[0];
+	res_mem.end = bdev->addr_s[0] + SZ_128M - 1;
+	res_mem.name = "PCIe MEM space";
+	res_mem.flags = IORESOURCE_MEM;
+	pci_add_resource(&res, &res_mem);
+
+	pcie->resources = &res;
+
+	pcie->map_irq = iproc_pcie_bcma_map_irq;
+
+	ret = iproc_pcie_setup(pcie);
+	if (ret) {
+		dev_err(pcie->dev, "PCIe controller setup failed\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static void iproc_pcie_bcma_remove(struct bcma_device *bdev)
+{
+	struct iproc_pcie *pcie = bcma_get_drvdata(bdev);
+
+	iproc_pcie_remove(pcie);
+}
+
+static const struct bcma_device_id iproc_pcie_bcma_table[] = {
+	BCMA_CORE(BCMA_MANUF_BCM, BCMA_CORE_NS_PCIEG2, BCMA_ANY_REV, BCMA_ANY_CLASS),
+	{},
+};
+MODULE_DEVICE_TABLE(bcma, iproc_pcie_bcma_table);
+
+static struct bcma_driver iproc_pcie_bcma_driver = {
+	.name		= KBUILD_MODNAME,
+	.id_table	= iproc_pcie_bcma_table,
+	.probe		= iproc_pcie_bcma_probe,
+	.remove		= iproc_pcie_bcma_remove,
+};
+
+static int __init iproc_pcie_bcma_init(void)
+{
+	return bcma_driver_register(&iproc_pcie_bcma_driver);
+}
+module_init(iproc_pcie_bcma_init);
+
+static void __exit iproc_pcie_bcma_exit(void)
+{
+	bcma_driver_unregister(&iproc_pcie_bcma_driver);
+}
+module_exit(iproc_pcie_bcma_exit);
+
+MODULE_AUTHOR("Hauke Mehrtens");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe bcma driver");
+MODULE_LICENSE("GPLv2");
-- 
2.1.4