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    SubjectRe: [PATCH][4/5] RapidIO support: ppc32
    Date
    Two questions:
    1. how well does will all of this handle > 32-bit phys addr?
    2. can we make any of this a platform driver?

    I would prefer if we could have the memory offsets and irq's not be
    straight from the #define's

    - kumar

    On Jun 6, 2005, at 5:40 PM, Matt Porter wrote:

    > Adds PPC32 RIO support. Init code for the MPC85xx RIO ports
    > and glue for the STx GP3 board to use it.
    >
    > Signed-off-by: Matt Porter <mporter@kernel.crashing.org>
    >
    > diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
    > --- a/arch/ppc/Kconfig
    > +++ b/arch/ppc/Kconfig
    > @@ -1177,6 +1177,14 @@ source "drivers/pci/Kconfig"
    >
    > source "drivers/pcmcia/Kconfig"
    >
    > +config RAPIDIO
    > + bool "RapidIO support" if MPC8540 || MPC8560
    > + help
    > + If you say Y here, the kernel will include drivers and
    > + infrastructure code to support RapidIO interconnect devices.
    > +
    > +source "drivers/rio/Kconfig"
    > +
    > endmenu
    >
    > menu "Advanced setup"
    > diff --git a/arch/ppc/configs/stx_gp3_defconfig
    > b/arch/ppc/configs/stx_gp3_defconfig
    > --- a/arch/ppc/configs/stx_gp3_defconfig
    > +++ b/arch/ppc/configs/stx_gp3_defconfig
    > @@ -1,7 +1,7 @@
    > #
    > # Automatically generated make config: don't edit
    > -# Linux kernel version: 2.6.11-rc2
    > -# Wed Jan 26 14:32:58 2005
    > +# Linux kernel version: 2.6.12-rc4
    > +# Tue May 24 18:11:04 2005
    > #
    > CONFIG_MMU=y
    > CONFIG_GENERIC_HARDIRQS=y
    > @@ -11,6 +11,7 @@ CONFIG_HAVE_DEC_LOCK=y
    > CONFIG_PPC=y
    > CONFIG_PPC32=y
    > CONFIG_GENERIC_NVRAM=y
    > +CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
    >
    > #
    > # Code maturity level options
    > @@ -18,6 +19,7 @@ CONFIG_GENERIC_NVRAM=y
    > CONFIG_EXPERIMENTAL=y
    > CONFIG_CLEAN_COMPILE=y
    > CONFIG_BROKEN_ON_SMP=y
    > +CONFIG_INIT_ENV_ARG_LIMIT=32
    >
    > #
    > # General setup
    > @@ -29,7 +31,6 @@ CONFIG_SYSVIPC=y
    > # CONFIG_BSD_PROCESS_ACCT is not set
    > CONFIG_SYSCTL=y
    > # CONFIG_AUDIT is not set
    > -CONFIG_LOG_BUF_SHIFT=14
    > CONFIG_HOTPLUG=y
    > CONFIG_KOBJECT_UEVENT=y
    > # CONFIG_IKCONFIG is not set
    > @@ -37,6 +38,9 @@ CONFIG_EMBEDDED=y
    > CONFIG_KALLSYMS=y
    > # CONFIG_KALLSYMS_ALL is not set
    > # CONFIG_KALLSYMS_EXTRA_PASS is not set
    > +CONFIG_PRINTK=y
    > +CONFIG_BUG=y
    > +CONFIG_BASE_FULL=y
    > CONFIG_FUTEX=y
    > CONFIG_EPOLL=y
    > # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
    > @@ -46,6 +50,7 @@ CONFIG_CC_ALIGN_LABELS=0
    > CONFIG_CC_ALIGN_LOOPS=0
    > CONFIG_CC_ALIGN_JUMPS=0
    > # CONFIG_TINY_SHMEM is not set
    > +CONFIG_BASE_SMALL=0
    >
    > #
    > # Loadable module support
    > @@ -69,9 +74,11 @@ CONFIG_KMOD=y
    > CONFIG_E500=y
    > CONFIG_BOOKE=y
    > CONFIG_FSL_BOOKE=y
    > +# CONFIG_PHYS_64BIT is not set
    > # CONFIG_SPE is not set
    > CONFIG_MATH_EMULATION=y
    > # CONFIG_CPU_FREQ is not set
    > +# CONFIG_PM is not set
    > CONFIG_85xx=y
    > CONFIG_PPC_INDIRECT_PCI_BE=y
    >
    > @@ -96,6 +103,7 @@ CONFIG_HIGHMEM=y
    > CONFIG_BINFMT_ELF=y
    > CONFIG_BINFMT_MISC=m
    > # CONFIG_CMDLINE_BOOL is not set
    > +CONFIG_ISA_DMA_API=y
    >
    > #
    > # Bus options
    > @@ -104,15 +112,15 @@ CONFIG_PCI=y
    > CONFIG_PCI_DOMAINS=y
    > # CONFIG_PCI_LEGACY_PROC is not set
    > # CONFIG_PCI_NAMES is not set
    > +# CONFIG_PCI_DEBUG is not set
    >
    > #
    > # PCCARD (PCMCIA/CardBus) support
    > #
    > # CONFIG_PCCARD is not set
    > -
    > -#
    > -# PC-card bridges
    > -#
    > +CONFIG_RAPIDIO=y
    > +CONFIG_RAPIDIO_8_BIT_TRANSPORT=y
    > +CONFIG_RAPIDIO_DISC_TIMEOUT=30
    >
    > #
    > # Advanced setup
    > @@ -152,7 +160,7 @@ CONFIG_PARPORT=m
    > CONFIG_PARPORT_PC=m
    > # CONFIG_PARPORT_PC_FIFO is not set
    > # CONFIG_PARPORT_PC_SUPERIO is not set
    > -# CONFIG_PARPORT_OTHER is not set
    > +# CONFIG_PARPORT_GSC is not set
    > # CONFIG_PARPORT_1284 is not set
    >
    > #
    > @@ -264,7 +272,6 @@ CONFIG_SCSI_CONSTANTS=y
    > # CONFIG_SCSI_BUSLOGIC is not set
    > # CONFIG_SCSI_DMX3191D is not set
    > # CONFIG_SCSI_EATA is not set
    > -# CONFIG_SCSI_EATA_PIO is not set
    > # CONFIG_SCSI_FUTURE_DOMAIN is not set
    > # CONFIG_SCSI_GDTH is not set
    > # CONFIG_SCSI_IPS is not set
    > @@ -274,7 +281,6 @@ CONFIG_SCSI_CONSTANTS=y
    > # CONFIG_SCSI_IMM is not set
    > # CONFIG_SCSI_SYM53C8XX_2 is not set
    > # CONFIG_SCSI_IPR is not set
    > -# CONFIG_SCSI_QLOGIC_ISP is not set
    > # CONFIG_SCSI_QLOGIC_FC is not set
    > # CONFIG_SCSI_QLOGIC_1280 is not set
    > CONFIG_SCSI_QLA2XXX=m
    > @@ -283,6 +289,7 @@ CONFIG_SCSI_QLA2XXX=m
    > # CONFIG_SCSI_QLA2300 is not set
    > # CONFIG_SCSI_QLA2322 is not set
    > # CONFIG_SCSI_QLA6312 is not set
    > +# CONFIG_SCSI_LPFC is not set
    > # CONFIG_SCSI_DC395x is not set
    > # CONFIG_SCSI_DC390T is not set
    > # CONFIG_SCSI_NSP32 is not set
    > @@ -322,7 +329,6 @@ CONFIG_NET=y
    > #
    > CONFIG_PACKET=y
    > # CONFIG_PACKET_MMAP is not set
    > -# CONFIG_NETLINK_DEV is not set
    > CONFIG_UNIX=y
    > # CONFIG_NET_KEY is not set
    > CONFIG_INET=y
    > @@ -431,7 +437,7 @@ CONFIG_IP_NF_NAT_FTP=m
    > #
    > # Network testing
    > #
    > -# CONFIG_NET_PKTGEN is not set
    > +CONFIG_NET_PKTGEN=y
    > # CONFIG_NETPOLL is not set
    > # CONFIG_NET_POLL_CONTROLLER is not set
    > # CONFIG_HAMRADIO is not set
    > @@ -499,6 +505,7 @@ CONFIG_GFAR_NAPI=y
    > # Wan interfaces
    > #
    > # CONFIG_WAN is not set
    > +CONFIG_RIONET=y
    > # CONFIG_FDDI is not set
    > # CONFIG_HIPPI is not set
    > # CONFIG_PLIP is not set
    > @@ -536,20 +543,6 @@ CONFIG_INPUT_EVDEV=m
    > # CONFIG_INPUT_EVBUG is not set
    >
    > #
    > -# Input I/O drivers
    > -#
    > -# CONFIG_GAMEPORT is not set
    > -CONFIG_SOUND_GAMEPORT=y
    > -CONFIG_SERIO=y
    > -CONFIG_SERIO_I8042=y
    > -CONFIG_SERIO_SERPORT=y
    > -# CONFIG_SERIO_CT82C710 is not set
    > -# CONFIG_SERIO_PARKBD is not set
    > -# CONFIG_SERIO_PCIPS2 is not set
    > -CONFIG_SERIO_LIBPS2=y
    > -# CONFIG_SERIO_RAW is not set
    > -
    > -#
    > # Input Device Drivers
    > #
    > CONFIG_INPUT_KEYBOARD=y
    > @@ -567,6 +560,19 @@ CONFIG_MOUSE_PS2=y
    > # CONFIG_INPUT_MISC is not set
    >
    > #
    > +# Hardware I/O ports
    > +#
    > +CONFIG_SERIO=y
    > +CONFIG_SERIO_I8042=y
    > +CONFIG_SERIO_SERPORT=y
    > +# CONFIG_SERIO_PARKBD is not set
    > +# CONFIG_SERIO_PCIPS2 is not set
    > +CONFIG_SERIO_LIBPS2=y
    > +# CONFIG_SERIO_RAW is not set
    > +# CONFIG_GAMEPORT is not set
    > +CONFIG_SOUND_GAMEPORT=y
    > +
    > +#
    > # Character devices
    > #
    > # CONFIG_VT is not set
    > @@ -590,6 +596,7 @@ CONFIG_SERIAL_CPM_SCC2=y
    > # CONFIG_SERIAL_CPM_SCC4 is not set
    > # CONFIG_SERIAL_CPM_SMC1 is not set
    > # CONFIG_SERIAL_CPM_SMC2 is not set
    > +# CONFIG_SERIAL_JSM is not set
    > CONFIG_UNIX98_PTYS=y
    > CONFIG_LEGACY_PTYS=y
    > CONFIG_LEGACY_PTY_COUNT=256
    > @@ -626,6 +633,11 @@ CONFIG_DRM=m
    > # CONFIG_RAW_DRIVER is not set
    >
    > #
    > +# TPM devices
    > +#
    > +# CONFIG_TCG_TPM is not set
    > +
    > +#
    > # I2C support
    > #
    > CONFIG_I2C=m
    > @@ -648,12 +660,12 @@ CONFIG_I2C_ALGOBIT=m
    > # CONFIG_I2C_AMD8111 is not set
    > # CONFIG_I2C_I801 is not set
    > # CONFIG_I2C_I810 is not set
    > +# CONFIG_I2C_PIIX4 is not set
    > # CONFIG_I2C_ISA is not set
    > # CONFIG_I2C_MPC is not set
    > # CONFIG_I2C_NFORCE2 is not set
    > # CONFIG_I2C_PARPORT is not set
    > # CONFIG_I2C_PARPORT_LIGHT is not set
    > -# CONFIG_I2C_PIIX4 is not set
    > # CONFIG_I2C_PROSAVAGE is not set
    > # CONFIG_I2C_SAVAGE4 is not set
    > # CONFIG_SCx200_ACB is not set
    > @@ -677,7 +689,9 @@ CONFIG_I2C_ALGOBIT=m
    > # CONFIG_SENSORS_ASB100 is not set
    > # CONFIG_SENSORS_DS1621 is not set
    > # CONFIG_SENSORS_FSCHER is not set
    > +# CONFIG_SENSORS_FSCPOS is not set
    > # CONFIG_SENSORS_GL518SM is not set
    > +# CONFIG_SENSORS_GL520SM is not set
    > # CONFIG_SENSORS_IT87 is not set
    > # CONFIG_SENSORS_LM63 is not set
    > # CONFIG_SENSORS_LM75 is not set
    > @@ -688,9 +702,11 @@ CONFIG_I2C_ALGOBIT=m
    > # CONFIG_SENSORS_LM85 is not set
    > # CONFIG_SENSORS_LM87 is not set
    > # CONFIG_SENSORS_LM90 is not set
    > +# CONFIG_SENSORS_LM92 is not set
    > # CONFIG_SENSORS_MAX1619 is not set
    > # CONFIG_SENSORS_PC87360 is not set
    > # CONFIG_SENSORS_SMSC47B397 is not set
    > +# CONFIG_SENSORS_SIS5595 is not set
    > # CONFIG_SENSORS_SMSC47M1 is not set
    > # CONFIG_SENSORS_VIA686A is not set
    > # CONFIG_SENSORS_W83781D is not set
    > @@ -700,10 +716,12 @@ CONFIG_I2C_ALGOBIT=m
    > #
    > # Other I2C Chip support
    > #
    > +# CONFIG_SENSORS_DS1337 is not set
    > # CONFIG_SENSORS_EEPROM is not set
    > # CONFIG_SENSORS_PCF8574 is not set
    > # CONFIG_SENSORS_PCF8591 is not set
    > # CONFIG_SENSORS_RTC8564 is not set
    > +# CONFIG_SENSORS_M41T00 is not set
    > # CONFIG_I2C_DEBUG_CORE is not set
    > # CONFIG_I2C_DEBUG_ALGO is not set
    > # CONFIG_I2C_DEBUG_BUS is not set
    > @@ -732,7 +750,6 @@ CONFIG_I2C_ALGOBIT=m
    > # Graphics support
    > #
    > # CONFIG_FB is not set
    > -# CONFIG_BACKLIGHT_LCD_SUPPORT is not set
    >
    > #
    > # Sound
    > @@ -752,13 +769,9 @@ CONFIG_SOUND=m
    > #
    > # USB support
    > #
    > -# CONFIG_USB is not set
    > CONFIG_USB_ARCH_HAS_HCD=y
    > CONFIG_USB_ARCH_HAS_OHCI=y
    > -
    > -#
    > -# NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support' may also be
    > needed; see USB_STORAGE Help for more information
    > -#
    > +# CONFIG_USB is not set
    >
    > #
    > # USB Gadget Support
    > @@ -789,6 +802,10 @@ CONFIG_JBD_DEBUG=y
    > CONFIG_FS_MBCACHE=y
    > # CONFIG_REISERFS_FS is not set
    > # CONFIG_JFS_FS is not set
    > +
    > +#
    > +# XFS support
    > +#
    > # CONFIG_XFS_FS is not set
    > # CONFIG_MINIX_FS is not set
    > # CONFIG_ROMFS_FS is not set
    > @@ -859,7 +876,6 @@ CONFIG_NFS_V3=y
    > CONFIG_ROOT_NFS=y
    > CONFIG_LOCKD=y
    > CONFIG_LOCKD_V4=y
    > -# CONFIG_EXPORTFS is not set
    > CONFIG_SUNRPC=y
    > # CONFIG_RPCSEC_GSS_KRB5 is not set
    > # CONFIG_RPCSEC_GSS_SPKM3 is not set
    > @@ -942,8 +958,10 @@ CONFIG_ZLIB_INFLATE=m
    > #
    > # Kernel hacking
    > #
    > +# CONFIG_PRINTK_TIME is not set
    > CONFIG_DEBUG_KERNEL=y
    > # CONFIG_MAGIC_SYSRQ is not set
    > +CONFIG_LOG_BUF_SHIFT=14
    > # CONFIG_SCHEDSTATS is not set
    > # CONFIG_DEBUG_SLAB is not set
    > # CONFIG_DEBUG_SPINLOCK is not set
    > diff --git a/arch/ppc/kernel/Makefile b/arch/ppc/kernel/Makefile
    > --- a/arch/ppc/kernel/Makefile
    > +++ b/arch/ppc/kernel/Makefile
    > @@ -22,6 +22,7 @@ obj-$(CONFIG_POWER4) += cpu_setup_power
    > obj-$(CONFIG_MODULES) += module.o ppc_ksyms.o
    > obj-$(CONFIG_NOT_COHERENT_CACHE) += dma-mapping.o
    > obj-$(CONFIG_PCI) += pci.o
    > +obj-$(CONFIG_RAPIDIO) += rio.o
    > obj-$(CONFIG_KGDB) += ppc-stub.o
    > obj-$(CONFIG_SMP) += smp.o smp-tbsync.o
    > obj-$(CONFIG_TAU) += temp.o
    > diff --git a/arch/ppc/kernel/rio.c b/arch/ppc/kernel/rio.c
    > new file mode 100644
    > --- /dev/null
    > +++ b/arch/ppc/kernel/rio.c
    > @@ -0,0 +1,52 @@
    > +/*
    > + * RapidIO PPC32 support
    > + *
    > + * Copyright 2005 MontaVista Software, Inc.
    > + * Matt Porter <mporter@kernel.crashing.org>
    > + *
    > + * 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; either version 2 of the License, or
    > (at your
    > + * option) any later version.
    > + */
    > +
    > +#include <linux/init.h>
    > +#include <linux/kernel.h>
    > +#include <linux/rio.h>
    > +
    > +#include <asm/rio.h>
    > +
    > +/**
    > + * platform_rio_init - Do platform specific RIO init
    > + *
    > + * Any platform specific initialization of RapdIO
    > + * hardware is done here as well as registration
    > + * of any active master ports in the system.
    > + */
    > +void __attribute__ ((weak))
    > + platform_rio_init(void)
    > +{
    > + printk(KERN_WARNING "RIO: No platform_rio_init() present\n");
    > +}
    > +
    > +/**
    > + * ppc_rio_init - Do PPC32 RIO init
    > + *
    > + * Calls platform-specific RIO init code and then calls
    > + * rio_init_mports() to initialize any master ports that
    > + * have been registered with the RIO subsystem.
    > + */
    > +static int __init ppc_rio_init(void)
    > +{
    > + printk(KERN_INFO "RIO: RapidIO init\n");
    > +
    > + /* Platform specific initialization */
    > + platform_rio_init();
    > +
    > + /* Enumerate all registered ports */
    > + rio_init_mports();
    > +
    > + return 0;
    > +}
    > +
    > +subsys_initcall(ppc_rio_init);
    > diff --git a/arch/ppc/platforms/85xx/stx_gp3.c
    > b/arch/ppc/platforms/85xx/stx_gp3.c
    > --- a/arch/ppc/platforms/85xx/stx_gp3.c
    > +++ b/arch/ppc/platforms/85xx/stx_gp3.c
    > @@ -38,6 +38,7 @@
    > #include <linux/module.h>
    > #include <linux/fsl_devices.h>
    > #include <linux/interrupt.h>
    > +#include <linux/rio.h>
    >
    > #include <asm/system.h>
    > #include <asm/pgtable.h>
    > @@ -59,6 +60,7 @@
    >
    > #include <syslib/cpm2_pic.h>
    > #include <syslib/ppc85xx_common.h>
    > +#include <syslib/ppc85xx_rio.h>
    >
    > extern void cpm2_reset(void);
    >
    > @@ -200,7 +202,6 @@ static struct irqaction cpm2_irqaction =
    > static void __init
    > gp3_init_IRQ(void)
    > {
    > - int i;
    > bd_t *binfo = (bd_t *) __res;
    >
    > /*
    > @@ -297,6 +298,18 @@ int mpc85xx_exclude_device(u_char bus, u
    > }
    > #endif /* CONFIG_PCI */
    >
    > +#ifdef CONFIG_RAPIDIO
    > +void
    > +platform_rio_init(void)
    > +{
    > + /*
    > + * The STx firmware configures the RapidIO Local Access Window
    > + * at 0xc0000000 with a size of 512MB.
    > + */
    > + mpc85xx_rio_setup(0xc0000000, 0x20000000);
    > +}
    > +#endif /* CONFIG_RAPIDIO */
    > +
    > void __init
    > platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
    > unsigned long r6, unsigned long r7)
    > diff --git a/arch/ppc/syslib/Makefile b/arch/ppc/syslib/Makefile
    > --- a/arch/ppc/syslib/Makefile
    > +++ b/arch/ppc/syslib/Makefile
    > @@ -101,6 +101,7 @@ obj-$(CONFIG_85xx) += open_pic.o ppc85x
    > mpc85xx_devices.o
    > ifeq ($(CONFIG_85xx),y)
    > obj-$(CONFIG_PCI) += indirect_pci.o pci_auto.o
    > +obj-$(CONFIG_RAPIDIO) += ppc85xx_rio.o
    > endif
    > obj-$(CONFIG_83xx) += ipic.o ppc83xx_setup.o ppc_sys.o \
    > mpc83xx_sys.o mpc83xx_devices.o
    > diff --git a/arch/ppc/syslib/ppc85xx_rio.c
    > b/arch/ppc/syslib/ppc85xx_rio.c
    > new file mode 100644
    > --- /dev/null
    > +++ b/arch/ppc/syslib/ppc85xx_rio.c
    > @@ -0,0 +1,867 @@
    > +/*
    > + * MPC85xx RapidIO support
    > + *
    > + * Copyright 2005 MontaVista Software, Inc.
    > + * Matt Porter <mporter@kernel.crashing.org>
    > + *
    > + * 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; either version 2 of the License, or
    > (at your
    > + * option) any later version.
    > + */
    > +
    > +#include <linux/config.h>
    > +#include <linux/init.h>
    > +#include <linux/module.h>
    > +#include <linux/types.h>
    > +#include <linux/dma-mapping.h>
    > +#include <linux/interrupt.h>
    > +#include <linux/rio.h>
    > +#include <linux/rio_drv.h>
    > +
    > +#include <asm/io.h>
    > +
    > +#define RIO_REGS_BASE (CCSRBAR + 0xc0000)
    > +#define RIO_ATMU_REGS_OFFSET 0x10c00
    > +#define RIO_MSG_REGS_OFFSET 0x11000
    > +#define RIO_MAINT_WIN_SIZE 0x400000
    > +#define RIO_DBELL_WIN_SIZE 0x1000
    > +
    > +#define RIO_MSG_OMR_MUI 0x00000002
    > +#define RIO_MSG_OSR_TE 0x00000080
    > +#define RIO_MSG_OSR_QOI 0x00000020
    > +#define RIO_MSG_OSR_QFI 0x00000010
    > +#define RIO_MSG_OSR_MUB 0x00000004
    > +#define RIO_MSG_OSR_EOMI 0x00000002
    > +#define RIO_MSG_OSR_QEI 0x00000001
    > +
    > +#define RIO_MSG_IMR_MI 0x00000002
    > +#define RIO_MSG_ISR_TE 0x00000080
    > +#define RIO_MSG_ISR_QFI 0x00000010
    > +#define RIO_MSG_ISR_DIQI 0x00000001
    > +
    > +#define RIO_MSG_DESC_SIZE 32
    > +#define RIO_MIN_TX_RING_SIZE 2
    > +#define RIO_MAX_TX_RING_SIZE 2048
    > +#define RIO_MIN_RX_RING_SIZE 2
    > +#define RIO_MAX_RX_RING_SIZE 2048
    > +
    > +#define DOORBELL_DMR_DI 0x00000002
    > +#define DOORBELL_DSR_TE 0x00000080
    > +#define DOORBELL_DSR_QFI 0x00000010
    > +#define DOORBELL_DSR_DIQI 0x00000001
    > +#define DOORBELL_TID_OFFSET 0x03
    > +#define DOORBELL_SID_OFFSET 0x05
    > +#define DOORBELL_INFO_OFFSET 0x06
    > +
    > +#define DOORBELL_MESSAGE_SIZE 0x08
    > +#define DBELL_SID(x) (*(u8 *)(x + DOORBELL_SID_OFFSET))
    > +#define DBELL_TID(x) (*(u8 *)(x + DOORBELL_TID_OFFSET))
    > +#define DBELL_INF(x) (*(u16 *)(x + DOORBELL_INFO_OFFSET))
    > +
    > +#define is_power_of_2(x) (((x) & ((x) - 1)) == 0)
    > +
    > +struct rio_atmu_regs {
    > + u32 rowtar;
    > + u32 pad1;
    > + u32 rowbar;
    > + u32 pad2;
    > + u32 rowar;
    > + u32 pad3[3];
    > +};
    > +
    > +struct rio_msg_regs {
    > + u32 omr;
    > + u32 osr;
    > + u32 pad1;
    > + u32 odqdpar;
    > + u32 pad2;
    > + u32 osar;
    > + u32 odpr;
    > + u32 odatr;
    > + u32 odcr;
    > + u32 pad3;
    > + u32 odqepar;
    > + u32 pad4[13];
    > + u32 imr;
    > + u32 isr;
    > + u32 pad5;
    > + u32 ifqdpar;
    > + u32 pad6;
    > + u32 ifqepar;
    > + u32 pad7[250];
    > + u32 dmr;
    > + u32 dsr;
    > + u32 pad8;
    > + u32 dqdpar;
    > + u32 pad9;
    > + u32 dqepar;
    > + u32 pad10[26];
    > + u32 pwmr;
    > + u32 pwsr;
    > + u32 pad11;
    > + u32 pwqbar;
    > +};
    > +
    > +struct rio_tx_desc {
    > + u32 res1;
    > + u32 saddr;
    > + u32 dport;
    > + u32 dattr;
    > + u32 res2;
    > + u32 res3;
    > + u32 dwcnt;
    > + u32 res4;
    > +};
    > +
    > +static u32 regs_win;
    > +static struct rio_atmu_regs *atmu_regs;
    > +static struct rio_atmu_regs *maint_atmu_regs;
    > +static struct rio_atmu_regs *dbell_atmu_regs;
    > +static u32 dbell_win;
    > +static u32 maint_win;
    > +static struct rio_msg_regs *msg_regs;
    > +
    > +static struct rio_dbell_ring {
    > + void *virt;
    > + dma_addr_t phys;
    > +} dbell_ring;
    > +
    > +static struct rio_msg_tx_ring {
    > + void *virt;
    > + dma_addr_t phys;
    > + void *virt_buffer[RIO_MAX_TX_RING_SIZE];
    > + dma_addr_t phys_buffer[RIO_MAX_TX_RING_SIZE];
    > + int tx_slot;
    > + int size;
    > +} msg_tx_ring;
    > +
    > +static struct rio_msg_rx_ring {
    > + void *virt;
    > + dma_addr_t phys;
    > + void *virt_buffer[RIO_MAX_RX_RING_SIZE];
    > + int rx_slot;
    > + int size;
    > +} msg_rx_ring;
    > +
    > +/**
    > + * mpc85xx_rio_doorbell_send - Send a MPC85xx doorbell message
    > + * @index: ID of RapidIO interface
    > + * @destid: Destination ID of target device
    > + * @data: 16-bit info field of RapidIO doorbell message
    > + *
    > + * Sends a MPC85xx doorbell message. Returns %0 on success or
    > + * %-EINVAL on failure.
    > + */
    > +static int mpc85xx_rio_doorbell_send(int index, u16 destid, u16 data)
    > +{
    > + pr_debug("mpc85xx_doorbell_send: index %d destid %4.4x data %4.4x\n",
    > + index, destid, data);
    > + out_be32((void *)&dbell_atmu_regs->rowtar, destid << 22);
    > + out_be16((void *)(dbell_win), data);
    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * mpc85xx_local_config_read - Generate a MPC85xx local config space
    > read
    > + * @index: ID of RapdiIO interface
    > + * @offset: Offset into configuration space
    > + * @len: Length (in bytes) of the maintenance transaction
    > + * @data: Value to be read into
    > + *
    > + * Generates a MPC85xx local configuration space read. Returns %0 on
    > + * success or %-EINVAL on failure.
    > + */
    > +static int mpc85xx_local_config_read(int index, u32 offset, int len,
    > u32 * data)
    > +{
    > + pr_debug("mpc85xx_local_config_read: index %d offset %8.8x\n", index,
    > + offset);
    > + *data = in_be32((void *)(regs_win + offset));
    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * mpc85xx_local_config_write - Generate a MPC85xx local config space
    > write
    > + * @index: ID of RapdiIO interface
    > + * @offset: Offset into configuration space
    > + * @len: Length (in bytes) of the maintenance transaction
    > + * @data: Value to be written
    > + *
    > + * Generates a MPC85xx local configuration space write. Returns %0 on
    > + * success or %-EINVAL on failure.
    > + */
    > +static int mpc85xx_local_config_write(int index, u32 offset, int len,
    > u32 data)
    > +{
    > + pr_debug
    > + ("mpc85xx_local_config_write: index %d offset %8.8x data
    > %8.8x\n",
    > + index, offset, data);
    > + out_be32((void *)(regs_win + offset), data);
    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * mpc85xx_rio_config_read - Generate a MPC85xx read maintenance
    > transaction
    > + * @index: ID of RapdiIO interface
    > + * @destid: Destination ID of transaction
    > + * @hopcount: Number of hops to target device
    > + * @offset: Offset into configuration space
    > + * @len: Length (in bytes) of the maintenance transaction
    > + * @val: Location to be read into
    > + *
    > + * Generates a MPC85xx read maintenance transaction. Returns %0 on
    > + * success or %-EINVAL on failure.
    > + */
    > +static int
    > +mpc85xx_rio_config_read(int index, u16 destid, u8 hopcount, u32
    > offset, int len,
    > + u32 * val)
    > +{
    > + u8 *data;
    > +
    > + pr_debug
    > + ("mpc85xx_rio_config_read: index %d destid %d hopcount %d offset
    > %8.8x len %d\n",
    > + index, destid, hopcount, offset, len);
    > + out_be32((void *)&maint_atmu_regs->rowtar,
    > + (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
    > +
    > + data = (u8 *) maint_win + offset;
    > + switch (len) {
    > + case 1:
    > + *val = in_8((u8 *) data);
    > + break;
    > + case 2:
    > + *val = in_be16((u16 *) data);
    > + break;
    > + default:
    > + *val = in_be32((u32 *) data);
    > + break;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * mpc85xx_rio_config_write - Generate a MPC85xx write maintenance
    > transaction
    > + * @index: ID of RapdiIO interface
    > + * @destid: Destination ID of transaction
    > + * @hopcount: Number of hops to target device
    > + * @offset: Offset into configuration space
    > + * @len: Length (in bytes) of the maintenance transaction
    > + * @val: Value to be written
    > + *
    > + * Generates an MPC85xx write maintenance transaction. Returns %0 on
    > + * success or %-EINVAL on failure.
    > + */
    > +static int
    > +mpc85xx_rio_config_write(int index, u16 destid, u8 hopcount, u32
    > offset,
    > + int len, u32 val)
    > +{
    > + u8 *data;
    > + pr_debug
    > + ("mpc85xx_rio_config_write: index %d destid %d hopcount %d
    > offset %8.8x len %d val %8.8x\n",
    > + index, destid, hopcount, offset, len, val);
    > + out_be32((void *)&maint_atmu_regs->rowtar,
    > + (destid << 22) | (hopcount << 12) | ((offset & ~0x3) >> 9));
    > +
    > + data = (u8 *) maint_win + offset;
    > + switch (len) {
    > + case 1:
    > + out_8((u8 *) data, val);
    > + break;
    > + case 2:
    > + out_be16((u16 *) data, val);
    > + break;
    > + default:
    > + out_be32((u32 *) data, val);
    > + break;
    > + }
    > +
    > + return 0;
    > +}
    > +
    > +/**
    > + * rio_hw_add_outb_message - Add message to the MPC85xx outbound
    > message queue
    > + * @mport: Master port with outbound message queue
    > + * @rdev: Target of outbound message
    > + * @mbox: Outbound mailbox
    > + * @buffer: Message to add to outbound queue
    > + * @len: Length of message
    > + *
    > + * Adds the @buffer message to the MPC85xx outbound message queue.
    > Returns
    > + * %0 on success or %-EINVAL on failure.
    > + */
    > +int
    > +rio_hw_add_outb_message(struct rio_mport *mport, struct rio_dev
    > *rdev, int mbox,
    > + void *buffer, size_t len)
    > +{
    > + u32 omr;
    > + struct rio_tx_desc *desc =
    > + (struct rio_tx_desc *)msg_tx_ring.virt + msg_tx_ring.tx_slot;
    > + int ret = 0;
    > +
    > + pr_debug(KERN_INFO
    > + "RIO: rio_hw_add_outb_message(): destid %4.4x mbox %d buffer %8.8x
    > len %8.8x\n",
    > + rdev->destid, mbox, (int)buffer, len);
    > +
    > + if ((len < 8) || (len > RIO_MAX_MSG_SIZE)) {
    > + ret = -EINVAL;
    > + goto out;
    > + }
    > +
    > + /* Copy and clear rest of buffer */
    > + memcpy(msg_tx_ring.virt_buffer[msg_tx_ring.tx_slot], buffer, len);
    > + if (len < (RIO_MAX_MSG_SIZE - 4))
    > + memset((void *)((u32) msg_tx_ring.
    > + virt_buffer[msg_tx_ring.tx_slot] + len), 0,
    > + RIO_MAX_MSG_SIZE - len);
    > +
    > + /* Set mbox field for message */
    > + desc->dport = mbox & 0x3;
    > +
    > + /* Enable EOMI interrupt, set priority, and set destid */
    > + desc->dattr = 0x28000000 | (rdev->destid << 2);
    > +
    > + /* Set transfer size aligned to next power of 2 (in double words) */
    > + desc->dwcnt = is_power_of_2(len) ? len : 1 << get_bitmask_order(len);
    > +
    > + /* Set snooping and source buffer address */
    > + desc->saddr = 0x00000004 |
    > msg_tx_ring.phys_buffer[msg_tx_ring.tx_slot];
    > +
    > + /* Increment enqueue pointer */
    > + omr = in_be32((void *)&msg_regs->omr);
    > + out_be32((void *)&msg_regs->omr, omr | RIO_MSG_OMR_MUI);
    > +
    > + /* Go to next descriptor */
    > + if (++msg_tx_ring.tx_slot == msg_tx_ring.size)
    > + msg_tx_ring.tx_slot = 0;
    > +
    > + out:
    > + return ret;
    > +}
    > +
    > +EXPORT_SYMBOL_GPL(rio_hw_add_outb_message);
    > +
    > +/**
    > + * mpc85xx_rio_tx_handler - MPC85xx outbound message interrupt handler
    > + * @irq: Linux interrupt number
    > + * @dev_instance: Pointer to interrupt-specific data
    > + * @regs: Register context
    > + *
    > + * Handles outbound message interrupts. Executes a register outbound
    > + * mailbox event handler and acks the interrupt occurence.
    > + */
    > +static irqreturn_t
    > +mpc85xx_rio_tx_handler(int irq, void *dev_instance, struct pt_regs
    > *regs)
    > +{
    > + int osr;
    > + struct rio_mport *port = (struct rio_mport *)dev_instance;
    > +
    > + osr = in_be32((void *)&msg_regs->osr);
    > +
    > + if (osr & RIO_MSG_OSR_TE) {
    > + printk(KERN_INFO "RIO: outbound message transmission error\n");
    > + out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_TE);
    > + goto out;
    > + }
    > +
    > + if (osr & RIO_MSG_OSR_QOI) {
    > + printk(KERN_INFO "RIO: outbound message queue overflow\n");
    > + out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_QOI);
    > + goto out;
    > + }
    > +
    > + if (osr & RIO_MSG_OSR_EOMI) {
    > + u32 dqp = in_be32((void *)&msg_regs->odqdpar);
    > + int slot = (dqp - msg_tx_ring.phys) >> 5;
    > + port->outb_msg[0].mcback(port, -1, slot);
    > +
    > + /* Ack the end-of-message interrupt */
    > + out_be32((void *)&msg_regs->osr, RIO_MSG_OSR_EOMI);
    > + }
    > +
    > + out:
    > + return IRQ_HANDLED;
    > +}
    > +
    > +/**
    > + * rio_open_outb_mbox - Initialize MPC85xx outbound mailbox
    > + * @mport: Master port implementing the outbound message unit
    > + * @mbox: Mailbox to open
    > + * @entries: Number of entries in the outbound mailbox ring
    > + *
    > + * Initializes buffer ring, request the outbound message interrupt,
    > + * and enables the outbound message unit. Returns %0 on success or
    > + * %-EINVAL on failure.
    > + */
    > +int rio_open_outb_mbox(struct rio_mport *mport, int mbox, int entries)
    > +{
    > + int i, rc = 0;
    > +
    > + if ((entries < RIO_MIN_TX_RING_SIZE) ||
    > + (entries > RIO_MAX_TX_RING_SIZE) || (!is_power_of_2(entries))) {
    > + rc = -EINVAL;
    > + goto out;
    > + }
    > +
    > + /* Initialize shadow copy ring */
    > + msg_tx_ring.size = entries;
    > +
    > + for (i = 0; i < msg_tx_ring.size; i++) {
    > + msg_tx_ring.virt_buffer[i] =
    > + (void *)__get_free_page(GFP_KERNEL);
    > + msg_tx_ring.phys_buffer[i] =
    > + (dma_addr_t) __pa(msg_tx_ring.virt_buffer[i]);
    > + }
    > +
    > + /* Initialize outbound message descriptor ring */
    > + msg_tx_ring.virt = dma_alloc_coherent(NULL,
    > + msg_tx_ring.size *
    > + RIO_MSG_DESC_SIZE,
    > + &msg_tx_ring.phys, GFP_KERNEL);
    > + memset(msg_tx_ring.virt, 0, msg_tx_ring.size * RIO_MSG_DESC_SIZE);
    > + msg_tx_ring.tx_slot = 0;
    > +
    > + /* Point dequeue/enqueue pointers at first entry in ring */
    > + out_be32((void *)&msg_regs->odqdpar, msg_tx_ring.phys);
    > + out_be32((void *)&msg_regs->odqepar, msg_tx_ring.phys);
    > +
    > + /* Configure for snooping */
    > + out_be32((void *)&msg_regs->osar, 0x00000004);
    > +
    > + /* Clear interrupt status */
    > + out_be32((void *)&msg_regs->osr, 0x000000b3);
    > +
    > + /* Hook up outbound message handler */
    > + request_irq(MPC85xx_IRQ_RIO_TX, mpc85xx_rio_tx_handler, 0, "msg_tx",
    > + (void *)mport);
    > +
    > + /*
    > + * Configure outbound message unit
    > + * Snooping
    > + * Interrupts (all enabled, except QEIE)
    > + * Chaining mode
    > + * Disable
    > + */
    > + out_be32((void *)&msg_regs->omr, 0x00100220);
    > +
    > + /* Set number of entries */
    > + out_be32((void *)&msg_regs->omr,
    > + in_be32((void *)&msg_regs->omr) |
    > + ((get_bitmask_order(entries) - 2) << 12));
    > +
    > + /* Now enable the unit */
    > + out_be32((void *)&msg_regs->omr, in_be32((void *)&msg_regs->omr) |
    > 0x1);
    > +
    > + out:
    > + return rc;
    > +}
    > +
    > +/**
    > + * rio_close_outb_mbox - Shut down MPC85xx outbound mailbox
    > + * @mport: Master port implementing the outbound message unit
    > + * @mbox: Mailbox to close
    > + *
    > + * Disables the outbound message unit, free all buffers, and
    > + * frees the outbound message interrupt.
    > + */
    > +void rio_close_outb_mbox(struct rio_mport *mport, int mbox)
    > +{
    > + /* Disable inbound message unit */
    > + out_be32((void *)&msg_regs->omr, 0);
    > +
    > + /* Free ring */
    > + dma_free_coherent(NULL, msg_tx_ring.size * RIO_MSG_DESC_SIZE,
    > + msg_tx_ring.virt, msg_tx_ring.phys);
    > +
    > + /* Free interrupt */
    > + free_irq(MPC85xx_IRQ_RIO_TX, (void *)mport);
    > +}
    > +
    > +/**
    > + * mpc85xx_rio_rx_handler - MPC85xx inbound message interrupt handler
    > + * @irq: Linux interrupt number
    > + * @dev_instance: Pointer to interrupt-specific data
    > + * @regs: Register context
    > + *
    > + * Handles inbound message interrupts. Executes a registered inbound
    > + * mailbox event handler and acks the interrupt occurence.
    > + */
    > +static irqreturn_t
    > +mpc85xx_rio_rx_handler(int irq, void *dev_instance, struct pt_regs
    > *regs)
    > +{
    > + int isr;
    > + struct rio_mport *port = (struct rio_mport *)dev_instance;
    > +
    > + isr = in_be32((void *)&msg_regs->isr);
    > +
    > + if (isr & RIO_MSG_ISR_TE) {
    > + printk(KERN_INFO "RIO: inbound message reception error\n");
    > + out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_TE);
    > + goto out;
    > + }
    > +
    > + /* XXX Need to check/dispatch until queue empty */
    > + if (isr & RIO_MSG_ISR_DIQI) {
    > + /*
    > + * We implement *only* mailbox 0, but can receive messages
    > + * for any mailbox/letter to that mailbox destination. So,
    > + * make the callback with an unknown/invalid mailbox number
    > + * argument.
    > + */
    > + port->inb_msg[0].mcback(port, -1, -1);
    > +
    > + /* Ack the queueing interrupt */
    > + out_be32((void *)&msg_regs->isr, RIO_MSG_ISR_DIQI);
    > + }
    > +
    > + out:
    > + return IRQ_HANDLED;
    > +}
    > +
    > +/**
    > + * rio_open_inb_mbox - Initialize MPC85xx inbound mailbox
    > + * @mport: Master port implementing the inbound message unit
    > + * @mbox: Mailbox to open
    > + * @entries: Number of entries in the inbound mailbox ring
    > + *
    > + * Initializes buffer ring, request the inbound message interrupt,
    > + * and enables the inbound message unit. Returns %0 on success
    > + * or %-EINVAL on failure.
    > + */
    > +int rio_open_inb_mbox(struct rio_mport *mport, int mbox, int entries)
    > +{
    > + int i, rc = 0;
    > +
    > + if ((entries < RIO_MIN_RX_RING_SIZE) ||
    > + (entries > RIO_MAX_RX_RING_SIZE) || (!is_power_of_2(entries))) {
    > + rc = -EINVAL;
    > + goto out;
    > + }
    > +
    > + /* Initialize client buffer ring */
    > + msg_rx_ring.size = entries;
    > + msg_rx_ring.rx_slot = 0;
    > + for (i = 0; i < msg_rx_ring.size; i++)
    > + msg_rx_ring.virt_buffer[i] = NULL;
    > +
    > + /* Initialize inbound message ring */
    > + msg_rx_ring.virt = dma_alloc_coherent(NULL,
    > + msg_rx_ring.size *
    > + RIO_MAX_MSG_SIZE,
    > + &msg_rx_ring.phys, GFP_KERNEL);
    > +
    > + /* Point dequeue/enqueue pointers at first entry in ring */
    > + out_be32((void *)&msg_regs->ifqdpar, (u32) msg_rx_ring.phys);
    > + out_be32((void *)&msg_regs->ifqepar, (u32) msg_rx_ring.phys);
    > +
    > + /* Clear interrupt status */
    > + out_be32((void *)&msg_regs->isr, 0x00000091);
    > +
    > + /* Hook up inbound message handler */
    > + request_irq(MPC85xx_IRQ_RIO_RX, mpc85xx_rio_rx_handler, 0, "msg_rx",
    > + (void *)mport);
    > +
    > + /*
    > + * Configure inbound message unit:
    > + * Snooping
    > + * 4KB max message size
    > + * Unmask all interrupt sources
    > + * Disable
    > + */
    > + out_be32((void *)&msg_regs->imr, 0x001b0060);
    > +
    > + /* Set number of queue entries */
    > + out_be32((void *)&msg_regs->imr,
    > + in_be32((void *)&msg_regs->imr) |
    > + ((get_bitmask_order(entries) - 2) << 12));
    > +
    > + /* Now enable the unit */
    > + out_be32((void *)&msg_regs->imr, in_be32((void *)&msg_regs->imr) |
    > 0x1);
    > +
    > + out:
    > + return rc;
    > +}
    > +
    > +/**
    > + * rio_close_inb_mbox - Shut down MPC85xx inbound mailbox
    > + * @mport: Master port implementing the inbound message unit
    > + * @mbox: Mailbox to close
    > + *
    > + * Disables the inbound message unit, free all buffers, and
    > + * frees the inbound message interrupt.
    > + */
    > +void rio_close_inb_mbox(struct rio_mport *mport, int mbox)
    > +{
    > + /* Disable inbound message unit */
    > + out_be32((void *)&msg_regs->imr, 0);
    > +
    > + /* Free ring */
    > + dma_free_coherent(NULL, msg_rx_ring.size * RIO_MAX_MSG_SIZE,
    > + msg_rx_ring.virt, msg_rx_ring.phys);
    > +
    > + /* Free interrupt */
    > + free_irq(MPC85xx_IRQ_RIO_RX, (void *)mport);
    > +}
    > +
    > +/**
    > + * rio_hw_add_inb_buffer - Add buffer to the MPC85xx inbound message
    > queue
    > + * @mport: Master port implementing the inbound message unit
    > + * @mbox: Inbound mailbox number
    > + * @buf: Buffer to add to inbound queue
    > + *
    > + * Adds the @buf buffer to the MPC85xx inbound message queue. Returns
    > + * %0 on success or %-EINVAL on failure.
    > + */
    > +int rio_hw_add_inb_buffer(struct rio_mport *mport, int mbox, void
    > *buf)
    > +{
    > + int rc = 0;
    > +
    > + pr_debug("RIO: rio_hw_add_inb_buffer(), msg_rx_ring.rx_slot %d\n",
    > + msg_rx_ring.rx_slot);
    > +
    > + if (msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot]) {
    > + printk(KERN_ERR
    > + "RIO: error adding inbound buffer %d, buffer exists\n",
    > + msg_rx_ring.rx_slot);
    > + rc = -EINVAL;
    > + goto out;
    > + }
    > +
    > + msg_rx_ring.virt_buffer[msg_rx_ring.rx_slot] = buf;
    > + if (++msg_rx_ring.rx_slot == msg_rx_ring.size)
    > + msg_rx_ring.rx_slot = 0;
    > +
    > + out:
    > + return rc;
    > +}
    > +
    > +EXPORT_SYMBOL_GPL(rio_hw_add_inb_buffer);
    > +
    > +/**
    > + * rio_hw_get_inb_message - Fetch inbound message from the MPC85xx
    > message unit
    > + * @mport: Master port implementing the inbound message unit
    > + * @mbox: Inbound mailbox number
    > + *
    > + * Gets the next available inbound message from the inbound message
    > queue.
    > + * A pointer to the message is returned on success or NULL on failure.
    > + */
    > +void *rio_hw_get_inb_message(struct rio_mport *mport, int mbox)
    > +{
    > + u32 imr;
    > + u32 phys_buf, virt_buf;
    > + void *buf = NULL;
    > + int buf_idx;
    > +
    > + phys_buf = in_be32((void *)&msg_regs->ifqdpar);
    > +
    > + /* If no more messages, then bail out */
    > + if (phys_buf == in_be32((void *)&msg_regs->ifqepar))
    > + goto out2;
    > +
    > + virt_buf = (u32) msg_rx_ring.virt + (phys_buf - msg_rx_ring.phys);
    > + buf_idx = (phys_buf - msg_rx_ring.phys) / RIO_MAX_MSG_SIZE;
    > + buf = msg_rx_ring.virt_buffer[buf_idx];
    > +
    > + if (!buf) {
    > + pr_debug(KERN_ERR
    > + "RIO: inbound message copy failed, no buffers\n");
    > + goto out1;
    > + }
    > +
    > + /* Copy max message size, caller is expected to allocate that big */
    > + memcpy(buf, (void *)virt_buf, RIO_MAX_MSG_SIZE);
    > +
    > + /* Clear the available buffer */
    > + msg_rx_ring.virt_buffer[buf_idx] = NULL;
    > +
    > + out1:
    > + imr = in_be32((void *)&msg_regs->imr);
    > + out_be32((void *)&msg_regs->imr, imr | RIO_MSG_IMR_MI);
    > +
    > + out2:
    > + return buf;
    > +}
    > +
    > +EXPORT_SYMBOL_GPL(rio_hw_get_inb_message);
    > +
    > +/**
    > + * mpc85xx_rio_dbell_handler - MPC85xx doorbell interrupt handler
    > + * @irq: Linux interrupt number
    > + * @dev_instance: Pointer to interrupt-specific data
    > + * @regs: Register context
    > + *
    > + * Handles doorbell interrupts. Parses a list of registered
    > + * doorbell event handlers and executes a matching event handler.
    > + */
    > +static irqreturn_t
    > +mpc85xx_rio_dbell_handler(int irq, void *dev_instance, struct pt_regs
    > *regs)
    > +{
    > + int dsr;
    > + struct rio_mport *port = (struct rio_mport *)dev_instance;
    > +
    > + dsr = in_be32((void *)&msg_regs->dsr);
    > +
    > + if (dsr & DOORBELL_DSR_TE) {
    > + printk(KERN_INFO "RIO: doorbell reception error\n");
    > + out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_TE);
    > + goto out;
    > + }
    > +
    > + if (dsr & DOORBELL_DSR_QFI) {
    > + printk(KERN_INFO "RIO: doorbell queue full\n");
    > + out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_QFI);
    > + goto out;
    > + }
    > +
    > + /* XXX Need to check/dispatch until queue empty */
    > + if (dsr & DOORBELL_DSR_DIQI) {
    > + u32 dmsg =
    > + (u32) dbell_ring.virt +
    > + (in_be32((void *)&msg_regs->dqdpar) & 0xfff);
    > + u32 dmr;
    > + struct rio_dbell *dbell;
    > + int found = 0;
    > +
    > + pr_debug(KERN_INFO
    > + "RIO: processing doorbell, sid %2.2x tid %2.2x info %4.4x\n",
    > + DBELL_SID(dmsg), DBELL_TID(dmsg), DBELL_INF(dmsg));
    > +
    > + list_for_each_entry(dbell, &port->dbells, node) {
    > + if ((dbell->res->start <= DBELL_INF(dmsg)) &&
    > + (dbell->res->end >= DBELL_INF(dmsg))) {
    > + found = 1;
    > + break;
    > + }
    > + }
    > + if (found) {
    > + dbell->dinb(port, DBELL_SID(dmsg), DBELL_TID(dmsg),
    > + DBELL_INF(dmsg));
    > + } else {
    > + pr_debug(KERN_INFO
    > + "RIO: spurious doorbell, sid %2.2x tid %2.2x info %4.4x\n",
    > + DBELL_SID(dmsg), DBELL_TID(dmsg),
    > + DBELL_INF(dmsg));
    > + }
    > + dmr = in_be32((void *)&msg_regs->dmr);
    > + out_be32((void *)&msg_regs->dmr, dmr | DOORBELL_DMR_DI);
    > + out_be32((void *)&msg_regs->dsr, DOORBELL_DSR_DIQI);
    > + }
    > +
    > + out:
    > + return IRQ_HANDLED;
    > +}
    > +
    > +/**
    > + * mpc85xx_rio_doorbell_init - MPC85xx doorbell interface init
    > + * @mport: Master port implementing the inbound doorbell unit
    > + *
    > + * Initializes doorbell unit hardware and inbound DMA buffer
    > + * ring. Called from mpc85xx_rio_setup().
    > + */
    > +static void mpc85xx_rio_doorbell_init(struct rio_mport *mport)
    > +{
    > + /* Map outbound doorbell window immediately after maintenance window
    > */
    > + dbell_win =
    > + (u32) ioremap(mport->iores.start + RIO_MAINT_WIN_SIZE,
    > + RIO_DBELL_WIN_SIZE);
    > +
    > + /* Initialize inbound doorbells */
    > + dbell_ring.virt = dma_alloc_coherent(NULL,
    > + 512 * DOORBELL_MESSAGE_SIZE,
    > + &dbell_ring.phys, GFP_KERNEL);
    > +
    > + /* Point dequeue/enqueue pointers at first entry in ring */
    > + out_be32((void *)&msg_regs->dqdpar, (u32) dbell_ring.phys);
    > + out_be32((void *)&msg_regs->dqepar, (u32) dbell_ring.phys);
    > +
    > + /* Clear interrupt status */
    > + out_be32((void *)&msg_regs->dsr, 0x00000091);
    > +
    > + /* Hook up doorbell handler */
    > + request_irq(MPC85xx_IRQ_RIO_BELL, mpc85xx_rio_dbell_handler, 0,
    > + "dbell_rx", (void *)mport);
    > +
    > + /* Configure doorbells for snooping, 512 entries, and enable */
    > + out_be32((void *)&msg_regs->dmr, 0x00108161);
    > +}
    > +
    > +static char *cmdline = NULL;
    > +
    > +static int mpc85xx_rio_get_hdid(int index)
    > +{
    > + /* XXX Need to parse multiple entries in some format */
    > + if (!cmdline)
    > + return -1;
    > +
    > + return simple_strtol(cmdline, NULL, 0);
    > +}
    > +
    > +static int mpc85xx_rio_get_cmdline(char *s)
    > +{
    > + if (!s)
    > + return 0;
    > +
    > + cmdline = s;
    > + return 1;
    > +}
    > +
    > +__setup("riohdid=", mpc85xx_rio_get_cmdline);
    > +
    > +/**
    > + * mpc85xx_rio_setup - Setup MPC85xx RapidIO interface
    > + * @law_start: Starting physical address of RapidIO LAW
    > + * @law_size: Size of RapidIO LAW
    > + *
    > + * Initializes MPC85xx RapidIO hardware interface, configures
    > + * master port with system-specific info, and registers the
    > + * master port with the RapidIO subsystem.
    > + */
    > +void mpc85xx_rio_setup(int law_start, int law_size)
    > +{
    > + struct rio_ops *ops;
    > + struct rio_mport *port;
    > +
    > + ops = kmalloc(sizeof(struct rio_ops), GFP_KERNEL);
    > + ops->lcread = mpc85xx_local_config_read;
    > + ops->lcwrite = mpc85xx_local_config_write;
    > + ops->cread = mpc85xx_rio_config_read;
    > + ops->cwrite = mpc85xx_rio_config_write;
    > + ops->dsend = mpc85xx_rio_doorbell_send;
    > +
    > + port = kmalloc(sizeof(struct rio_mport), GFP_KERNEL);
    > + port->id = 0;
    > + port->index = 0;
    > + INIT_LIST_HEAD(&port->dbells);
    > + port->iores.start = law_start;
    > + port->iores.end = law_start + law_size;
    > + port->iores.flags = IORESOURCE_MEM;
    > +
    > + rio_init_dbell_res(&port->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff);
    > + rio_init_mbox_res(&port->riores[RIO_INB_MBOX_RESOURCE], 0, 0);
    > + rio_init_mbox_res(&port->riores[RIO_OUTB_MBOX_RESOURCE], 0, 0);
    > + strcpy(port->name, "RIO0 mport");
    > +
    > + port->ops = ops;
    > + port->host_deviceid = mpc85xx_rio_get_hdid(port->id);
    > +
    > + rio_register_mport(port);
    > +
    > + regs_win = (u32) ioremap(RIO_REGS_BASE, 0x20000);
    > + atmu_regs = (struct rio_atmu_regs *)(regs_win +
    > RIO_ATMU_REGS_OFFSET);
    > + maint_atmu_regs = atmu_regs + 1;
    > + dbell_atmu_regs = atmu_regs + 2;
    > + msg_regs = (struct rio_msg_regs *)(regs_win + RIO_MSG_REGS_OFFSET);
    > +
    > + /* Configure maintenance transaction window */
    > + out_be32((void *)&maint_atmu_regs->rowbar, 0x000c0000);
    > + out_be32((void *)&maint_atmu_regs->rowar, 0x80077015);
    > +
    > + maint_win = (u32) ioremap(law_start, RIO_MAINT_WIN_SIZE);
    > +
    > + /* Configure outbound doorbell window */
    > + out_be32((void *)&dbell_atmu_regs->rowbar, 0x000c0400);
    > + out_be32((void *)&dbell_atmu_regs->rowar, 0x8004200b);
    > + mpc85xx_rio_doorbell_init(port);
    > +}
    > diff --git a/arch/ppc/syslib/ppc85xx_rio.h
    > b/arch/ppc/syslib/ppc85xx_rio.h
    > new file mode 100644
    > --- /dev/null
    > +++ b/arch/ppc/syslib/ppc85xx_rio.h
    > @@ -0,0 +1,21 @@
    > +/*
    > + * MPC85xx RapidIO definitions
    > + *
    > + * Copyright 2005 MontaVista Software, Inc.
    > + * Matt Porter <mporter@kernel.crashing.org>
    > + *
    > + * 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; either version 2 of the License, or
    > (at your
    > + * option) any later version.
    > + */
    > +
    > +#ifndef __PPC_SYSLIB_PPC85XX_RIO_H
    > +#define __PPC_SYSLIB_PPC85XX_RIO_H
    > +
    > +#include <linux/config.h>
    > +#include <linux/init.h>
    > +
    > +extern void mpc85xx_rio_setup(int law_start, int law_size);
    > +
    > +#endif /* __PPC_SYSLIB_PPC85XX_RIO_H */
    > diff --git a/include/asm-ppc/rio.h b/include/asm-ppc/rio.h
    > new file mode 100644
    > --- /dev/null
    > +++ b/include/asm-ppc/rio.h
    > @@ -0,0 +1,18 @@
    > +/*
    > + * RapidIO architecture support
    > + *
    > + * Copyright 2005 MontaVista Software, Inc.
    > + * Matt Porter <mporter@kernel.crashing.org>
    > + *
    > + * 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; either version 2 of the License, or
    > (at your
    > + * option) any later version.
    > + */
    > +
    > +#ifndef ASM_PPC_RIO_H
    > +#define ASM_PPC_RIO_H
    > +
    > +extern void platform_rio_init(void);
    > +
    > +#endif /* ASM_PPC_RIO_H */
    > _______________________________________________
    > Linuxppc-embedded mailing list
    > Linuxppc-embedded@ozlabs.org
    > https://ozlabs.org/mailman/listinfo/linuxppc-embedded

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