PCI: iproc: Add Broadcom iProc PCIe support

Add support for the Broadcom iProc PCIe controller.

pcie-iproc.c is the common core driver, and a front-end bus interface needs
to be added to support different bus interfaces.

pcie-iproc-platform.c contains the support for the platform bus interface.

Signed-off-by: Ray Jui <rjui@broadcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Scott Branden <sbranden@broadcom.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

5 files changed, 439 insertions, 0 deletions

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 7b892a9cc4fc..1dfb567b3522 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -106,4 +106,23 @@ config PCI_VERSATILE
         bool "ARM Versatile PB PCI controller"
         depends on ARCH_VERSATILE
 
+config PCIE_IPROC
+        tristate "Broadcom iProc PCIe controller"
+        depends on OF && ARM
+        default n
+        help
+          This enables the iProc PCIe core controller support for Broadcom's
+          iProc family of SoCs. An appropriate bus interface driver also needs
+          to be enabled
+
+config PCIE_IPROC_PLATFORM
+        tristate "Broadcom iProc PCIe platform bus driver"
+        depends on ARCH_BCM_IPROC || (ARM && COMPILE_TEST)
+        depends on OF
+        select PCIE_IPROC
+        default ARCH_BCM_IPROC
+        help
+          Say Y here if you want to use the Broadcom iProc PCIe controller
+          through the generic platform bus interface
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index e61d91c92bf1..f733b4e27642 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -13,3 +13,5 @@ obj-$(CONFIG_PCIE_XILINX) += pcie-xilinx.o
 obj-$(CONFIG_PCI_XGENE) += pci-xgene.o
 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
diff --git a/drivers/pci/host/pcie-iproc-platform.c b/drivers/pci/host/pcie-iproc-platform.c
new file mode 100644
index 000000000000..afad6c21fcfa
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc-platform.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2015 Broadcom Corporation
+ *
+ * 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/clk.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+
+#include "pcie-iproc.h"
+
+static int iproc_pcie_pltfm_probe(struct platform_device *pdev)
+{
+        struct iproc_pcie *pcie;
+        struct device_node *np = pdev->dev.of_node;
+        struct resource reg;
+        resource_size_t iobase = 0;
+        LIST_HEAD(res);
+        int ret;
+
+        pcie = devm_kzalloc(&pdev->dev, sizeof(struct iproc_pcie), GFP_KERNEL);
+        if (!pcie)
+                return -ENOMEM;
+
+        pcie->dev = &pdev->dev;
+        platform_set_drvdata(pdev, pcie);
+
+        ret = of_address_to_resource(np, 0, &reg);
+        if (ret < 0) {
+                dev_err(pcie->dev, "unable to obtain controller resources\n");
+                return ret;
+        }
+
+        pcie->base = devm_ioremap(pcie->dev, reg.start, resource_size(&reg));
+        if (!pcie->base) {
+                dev_err(pcie->dev, "unable to map controller registers\n");
+                return -ENOMEM;
+        }
+
+        /* PHY use is optional */
+        pcie->phy = devm_phy_get(&pdev->dev, "pcie-phy");
+        if (IS_ERR(pcie->phy)) {
+                if (PTR_ERR(pcie->phy) == -EPROBE_DEFER)
+                        return -EPROBE_DEFER;
+                pcie->phy = NULL;
+        }
+
+        ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &iobase);
+        if (ret) {
+                dev_err(pcie->dev,
+                        "unable to get PCI host bridge resources\n");
+                return ret;
+        }
+
+        pcie->resources = &res;
+
+        ret = iproc_pcie_setup(pcie);
+        if (ret) {
+                dev_err(pcie->dev, "PCIe controller setup failed\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static int iproc_pcie_pltfm_remove(struct platform_device *pdev)
+{
+        struct iproc_pcie *pcie = platform_get_drvdata(pdev);
+
+        return iproc_pcie_remove(pcie);
+}
+
+static const struct of_device_id iproc_pcie_of_match_table[] = {
+        { .compatible = "brcm,iproc-pcie", },
+        { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, iproc_pcie_of_match_table);
+
+static struct platform_driver iproc_pcie_pltfm_driver = {
+        .driver = {
+                .name = "iproc-pcie",
+                .of_match_table = of_match_ptr(iproc_pcie_of_match_table),
+        },
+        .probe = iproc_pcie_pltfm_probe,
+        .remove = iproc_pcie_pltfm_remove,
+};
+module_platform_driver(iproc_pcie_pltfm_driver);
+
+MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>");
+MODULE_DESCRIPTION("Broadcom iPROC PCIe platform driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
new file mode 100644
index 000000000000..329e1b54528b
--- /dev/null
+++ b/drivers/pci/host/pcie-iproc.c
@@ -0,0 +1,268 @@
+/*
+ * Copyright (C) 2014 Hauke Mehrtens <hauke@hauke-m.de>
+ * Copyright (C) 2015 Broadcom Corporatcommon ion
+ *
+ * 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/msi.h>
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/mbus.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+
+#include "pcie-iproc.h"
+
+#define CLK_CONTROL_OFFSET           0x000
+#define EP_MODE_SURVIVE_PERST_SHIFT  1
+#define EP_MODE_SURVIVE_PERST        BIT(EP_MODE_SURVIVE_PERST_SHIFT)
+#define RC_PCIE_RST_OUTPUT_SHIFT     0
+#define RC_PCIE_RST_OUTPUT           BIT(RC_PCIE_RST_OUTPUT_SHIFT)
+
+#define CFG_IND_ADDR_OFFSET          0x120
+#define CFG_IND_ADDR_MASK            0x00001ffc
+
+#define CFG_IND_DATA_OFFSET          0x124
+
+#define CFG_ADDR_OFFSET              0x1f8
+#define CFG_ADDR_BUS_NUM_SHIFT       20
+#define CFG_ADDR_BUS_NUM_MASK        0x0ff00000
+#define CFG_ADDR_DEV_NUM_SHIFT       15
+#define CFG_ADDR_DEV_NUM_MASK        0x000f8000
+#define CFG_ADDR_FUNC_NUM_SHIFT      12
+#define CFG_ADDR_FUNC_NUM_MASK       0x00007000
+#define CFG_ADDR_REG_NUM_SHIFT       2
+#define CFG_ADDR_REG_NUM_MASK        0x00000ffc
+#define CFG_ADDR_CFG_TYPE_SHIFT      0