MIPS: Netlogic: XLP PCIe controller support.

Adds support for the XLP on-chip PCIe controller. On XLP, the
on-chip devices(including the 4 PCIe links) appear in the PCIe
configuration space of the XLP as PCI devices.

The changes are to initialize and register the PCIe controller,
enable hardware byte swap in the PCIe IO and MEM space, and to
enable PCIe interrupts.

Signed-off-by: Ganesan Ramalingam <ganesanr@netlogicmicro.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3760/
Patchwork: https://patchwork.linux-mips.org/patch/4104/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

7 files changed, 350 insertions, 3 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 96bad981cd42..de335bb26720 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -801,7 +801,6 @@ config NLM_XLP_BOARD
         select SYS_HAS_CPU_XLP
         select SYS_SUPPORTS_SMP
         select HW_HAS_PCI
-        select SWAP_IO_SPACE
         select SYS_SUPPORTS_32BIT_KERNEL
         select SYS_SUPPORTS_64BIT_KERNEL
         select 64BIT_PHYS_ADDR
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/iomap.h b/arch/mips/include/asm/netlogic/xlp-hal/iomap.h
index 86cc3391e50c..ece86f1fcebb 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/iomap.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/iomap.h
@@ -36,6 +36,9 @@
 #define __NLM_HAL_IOMAP_H__
 
 #define XLP_DEFAULT_IO_BASE             0x18000000
+#define XLP_DEFAULT_PCI_ECFG_BASE       XLP_DEFAULT_IO_BASE
+#define XLP_DEFAULT_PCI_CFG_BASE        0x1c000000
+
 #define NMI_BASE                        0xbfc00000
 #define XLP_IO_CLK                      133333333
 
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/pcibus.h b/arch/mips/include/asm/netlogic/xlp-hal/pcibus.h
new file mode 100644
index 000000000000..66c323d1bd7d
--- /dev/null
+++ b/arch/mips/include/asm/netlogic/xlp-hal/pcibus.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2003-2012 Broadcom Corporation
+ * All Rights Reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the Broadcom
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __NLM_HAL_PCIBUS_H__
+#define __NLM_HAL_PCIBUS_H__
+
+/* PCIE Memory and IO regions */
+#define PCIE_MEM_BASE                   0xd0000000ULL
+#define PCIE_MEM_LIMIT                  0xdfffffffULL
+#define PCIE_IO_BASE                    0x14000000ULL
+#define PCIE_IO_LIMIT                   0x15ffffffULL
+
+#define PCIE_BRIDGE_CMD                 0x1
+#define PCIE_BRIDGE_MSI_CAP             0x14
+#define PCIE_BRIDGE_MSI_ADDRL           0x15
+#define PCIE_BRIDGE_MSI_ADDRH           0x16
+#define PCIE_BRIDGE_MSI_DATA            0x17
+
+/* XLP Global PCIE configuration space registers */
+#define PCIE_BYTE_SWAP_MEM_BASE         0x247
+#define PCIE_BYTE_SWAP_MEM_LIM          0x248
+#define PCIE_BYTE_SWAP_IO_BASE          0x249
+#define PCIE_BYTE_SWAP_IO_LIM           0x24A
+#define PCIE_MSI_STATUS                 0x25A
+#define PCIE_MSI_EN                     0x25B
+#define PCIE_INT_EN0                    0x261
+
+/* PCIE_MSI_EN */
+#define PCIE_MSI_VECTOR_INT_EN          0xFFFFFFFF
+
+/* PCIE_INT_EN0 */
+#define PCIE_MSI_INT_EN                 (1 << 9)
+
+#ifndef __ASSEMBLY__
+
+#define nlm_read_pcie_reg(b, r)         nlm_read_reg(b, r)
+#define nlm_write_pcie_reg(b, r, v)     nlm_write_reg(b, r, v)
+#define nlm_get_pcie_base(node, inst)   \
+                        nlm_pcicfg_base(XLP_IO_PCIE_OFFSET(node, inst))
+#define nlm_get_pcie_regbase(node, inst)        \
+                        (nlm_get_pcie_base(node, inst) + XLP_IO_PCI_HDRSZ)
+
+int xlp_pcie_link_irt(int link);
+#endif
+#endif /* __NLM_HAL_PCIBUS_H__ */
diff --git a/arch/mips/include/asm/netlogic/xlp-hal/xlp.h b/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
index 1540588e396d..dc6e98eb441e 100644
--- a/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
+++ b/arch/mips/include/asm/netlogic/xlp-hal/xlp.h
@@ -35,8 +35,12 @@
 #ifndef _NLM_HAL_XLP_H
 #define _NLM_HAL_XLP_H
 
-#define PIC_UART_0_IRQ           17
-#define PIC_UART_1_IRQ           18
+#define PIC_UART_0_IRQ                  17
+#define PIC_UART_1_IRQ                  18
+#define PIC_PCIE_LINK_0_IRQ             19
+#define PIC_PCIE_LINK_1_IRQ             20
+#define PIC_PCIE_LINK_2_IRQ             21
+#define PIC_PCIE_LINK_3_IRQ             22
 
 #ifndef __ASSEMBLY__
 
diff --git a/arch/mips/netlogic/xlp/nlm_hal.c b/arch/mips/netlogic/xlp/nlm_hal.c
index 9428e7125fed..3a4a17219723 100644
--- a/arch/mips/netlogic/xlp/nlm_hal.c
+++ b/arch/mips/netlogic/xlp/nlm_hal.c
@@ -69,6 +69,14 @@ int nlm_irq_to_irt(int irq)
                 return PIC_IRT_UART_0_INDEX;
         case PIC_UART_1_IRQ:
                 return PIC_IRT_UART_1_INDEX;
+        case PIC_PCIE_LINK_0_IRQ:
+               return PIC_IRT_PCIE_LINK_0_INDEX;
+        case PIC_PCIE_LINK_1_IRQ:
+               return PIC_IRT_PCIE_LINK_1_INDEX;
+        case PIC_PCIE_LINK_2_IRQ:
+               return PIC_IRT_PCIE_LINK_2_INDEX;
+        case PIC_PCIE_LINK_3_IRQ:
+               return PIC_IRT_PCIE_LINK_3_INDEX;
         default:
                 return -1;
         }
@@ -81,6 +89,14 @@ int nlm_irt_to_irq(int irt)
                 return PIC_UART_0_IRQ;
         case PIC_IRT_UART_1_INDEX:
                 return PIC_UART_1_IRQ;
+        case PIC_IRT_PCIE_LINK_0_INDEX:
+               return PIC_PCIE_LINK_0_IRQ;
+        case PIC_IRT_PCIE_LINK_1_INDEX:
+               return PIC_PCIE_LINK_1_IRQ;
+        case PIC_IRT_PCIE_LINK_2_INDEX:
+               return PIC_PCIE_LINK_2_IRQ;
+        case PIC_IRT_PCIE_LINK_3_INDEX:
+               return PIC_PCIE_LINK_3_IRQ;
         default:
                 return -1;
         }
diff --git a/arch/mips/pci/Makefile b/arch/mips/pci/Makefile
index c703f43a9914..e13a71cbc3c7 100644
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -59,6 +59,7 @@ obj-$(CONFIG_WR_PPMC)		+= fixup-wrppmc.o
 obj-$(CONFIG_MIKROTIK_RB532)    += pci-rc32434.o ops-rc32434.o fixup-rc32434.o
 obj-$(CONFIG_CPU_CAVIUM_OCTEON) += pci-octeon.o pcie-octeon.o
 obj-$(CONFIG_CPU_XLR)           += pci-xlr.o
+obj-$(CONFIG_CPU_XLP)           += pci-xlp.o
 
 ifdef CONFIG_PCI_MSI
 obj-$(CONFIG_CPU_CAVIUM_OCTEON) += msi-octeon.o
diff --git a/arch/mips/pci/pci-xlp.c b/arch/mips/pci/pci-xlp.c
new file mode 100644
index 000000000000..140557a20488
--- /dev/null
+++ b/arch/mips/pci/pci-xlp.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (c) 2003-2012 Broadcom Corporation
+ * All Rights Reserved
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the Broadcom
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/types.h>
+#include <linux/pci.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/msi.h>
+#include <linux/mm.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/console.h>
+
+#include <asm/io.h>
+
+#include <asm/netlogic/interrupt.h>
+#include <asm/netlogic/haldefs.h>
+
+#include <asm/netlogic/xlp-hal/iomap.h>
+#include <asm/netlogic/xlp-hal/pic.h>
+#include <asm/netlogic/xlp-hal/xlp.h>
+#include <asm/netlogic/xlp-hal/pcibus.h>
+#include <asm/netlogic/xlp-hal/bridge.h>
+
+static void *pci_config_base;
+
+#define pci_cfg_addr(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))
+
+/* PCI ops */
+static inline u32 pci_cfg_read_32bit(struct pci_bus *bus, unsigned int devfn,
+        int where)
+{
+        u32 data;
+        u32 *cfgaddr;
+
+        cfgaddr = (u32 *)(pci_config_base +
+                        pci_cfg_addr(bus->number, devfn, where & ~3));
+        data = *cfgaddr;
+        return data;
+}
+
+static inline void pci_cfg_write_32bit(struct pci_bus *bus, unsigned int devfn,
+        int where, u32 data)
+{
+        u32 *cfgaddr;
+
+        cfgaddr = (u32 *)(pci_config_base +
+                        pci_cfg_addr(bus->number, devfn, where & ~3));
+        *cfgaddr = data;
+}
+
+static int nlm_pcibios_read(struct pci_bus *bus, unsigned int devfn,
+        int where, int size, u32 *val)
+{
+        u32 data;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        data = pci_cfg_read_32bit(bus, devfn, where);
+
+        if (size == 1)
+                *val = (data >> ((where & 3) << 3)) & 0xff;
+        else if (size == 2)
+                *val = (data >> ((where & 3) << 3)) & 0xffff;
+        else
+                *val = data;
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+
+static int nlm_pcibios_write(struct pci_bus *bus, unsigned int devfn,
+                int where, int size, u32 val)
+{
+        u32 data;
+
+        if ((size == 2) && (where & 1))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+        else if ((size == 4) && (where & 3))
+                return PCIBIOS_BAD_REGISTER_NUMBER;
+
+        data = pci_cfg_read_32bit(bus, devfn, where);
+
+        if (size == 1)
+                data = (data & ~(0xff << ((where & 3) << 3))) |
+                        (val << ((where & 3) << 3));
+        else if (size == 2)
+                data = (data & ~(0xffff << ((where & 3) << 3))) |
+                        (val << ((where & 3) << 3));
+        else
+                data = val;
+
+        pci_cfg_write_32bit(bus, devfn, where, data);
+
+        return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops nlm_pci_ops = {
+        .read  = nlm_pcibios_read,
+        .write = nlm_pcibios_write
+};
+
+static struct resource nlm_pci_mem_resource = {
+        .name           = "XLP PCI MEM",
+        .start          = 0xd0000000UL, /* 256MB PCI mem @ 0xd000_0000 */
+        .end            = 0xdfffffffUL,
+        .flags          = IORESOURCE_MEM,
+};
+
+static struct resource nlm_pci_io_resource = {
+        .name           = "XLP IO MEM",
+        .start          = 0x14000000UL, /* 64MB PCI IO @ 0x1000_0000 */
+        .end            = 0x17ffffffUL,
+        .flags          = IORESOURCE_IO,
+};
+
+struct pci_controller nlm_pci_controller = {
+        .index          = 0,
+        .pci_ops        = &nlm_pci_ops,
+        .mem_resource   = &nlm_pci_mem_resource,
+        .mem_offset     = 0x00000000UL,
+        .io_resource    = &nlm_pci_io_resource,
+        .io_offset      = 0x00000000UL,
+};
+
+static int get_irq_vector(const struct pci_dev *dev)
+{
+        /*
+         * For XLP PCIe, there is an IRQ per Link, find out which
+         * link the device is on to assign interrupts
+        */
+        if (dev->bus->self == NULL)
+                return 0;
+
+        switch  (dev->bus->self->devfn) {
+        case 0x8:
+                return PIC_PCIE_LINK_0_IRQ;
+        case 0x9:
+                return PIC_PCIE_LINK_1_IRQ;
+        case 0xa:
+                return PIC_PCIE_LINK_2_IRQ;
+        case 0xb:
+                return PIC_PCIE_LINK_3_IRQ;
+        }
+        WARN(1, "Unexpected devfn %d\n", dev->bus->self->devfn);
+        return 0;
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+        return get_irq_vector(dev);
+}
+
+/* Do platform specific device initialization at pci_enable_device() time */
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+        return 0;
+}
+
+static int xlp_enable_pci_bswap(void)
+{
+        uint64_t pciebase, sysbase;
+        int node, i;
+        u32 reg;
+
+        /* Chip-0 so node set to 0 */
+        node = 0;
+        sysbase = nlm_get_bridge_regbase(node);
+        /*
+         *  Enable byte swap in hardware. Program each link's PCIe SWAP regions
+         * from the link's address ranges.
+         */
+        for (i = 0; i < 4; i++) {
+                pciebase = nlm_pcicfg_base(XLP_IO_PCIE_OFFSET(node, i));
+                if (nlm_read_pci_reg(pciebase, 0) == 0xffffffff)
+                        continue;
+
+                reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_BASE0 + i);
+                nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_BASE, reg);
+
+                reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEMEM_LIMIT0 + i);
+                nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_MEM_LIM,
+                        reg | 0xfff);
+
+                reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_BASE0 + i);
+                nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_BASE, reg);
+
+                reg = nlm_read_bridge_reg(sysbase, BRIDGE_PCIEIO_LIMIT0 + i);
+                nlm_write_pci_reg(pciebase, PCIE_BYTE_SWAP_IO_LIM, reg | 0xfff);
+        }
+        return 0;
+}
+
+static int __init pcibios_init(void)
+{
+        /* Firmware assigns PCI resources */
+        pci_set_flags(PCI_PROBE_ONLY);
+        pci_config_base = ioremap(XLP_DEFAULT_PCI_ECFG_BASE, 64 << 20);
+
+        /* Extend IO port for memory mapped io */
+        ioport_resource.start =  0;
+        ioport_resource.end   = ~0;
+
+        xlp_enable_pci_bswap();
+        set_io_port_base(CKSEG1);
+        nlm_pci_controller.io_map_base = CKSEG1;
+
+        register_pci_controller(&nlm_pci_controller);
+        pr_info("XLP PCIe Controller %pR%pR.\n", &nlm_pci_io_resource,
+                &nlm_pci_mem_resource);
+
+        return 0;
+}
+arch_initcall(pcibios_init);