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Message-ID: <4DA5EA73.2040803@lwfinger.net>
Date: Wed, 13 Apr 2011 13:24:51 -0500
From: Larry Finger <Larry.Finger@...inger.net>
To: Rafał Miłecki <zajec5@...il.com>
CC: linux-wireless@...r.kernel.org,
"John W. Linville" <linville@...driver.com>,
b43-dev@...ts.infradead.org, Greg KH <greg@...ah.com>,
Michael Büsch <mb@...sch.de>,
George Kashperko <george@...u.edu.ua>,
Arend van Spriel <arend@...adcom.com>,
linux-arm-kernel@...ts.infradead.org,
Russell King <rmk@....linux.org.uk>,
Arnd Bergmann <arnd@...db.de>,
Andy Botting <andy@...ybotting.com>,
linuxdriverproject <devel@...uxdriverproject.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH V4] axi: add AXI bus driver
On 04/12/2011 01:52 PM, Rafał Miłecki wrote:
> Cc: Greg KH<greg@...ah.com>
> Cc: Michael Büsch<mb@...sch.de>
> Cc: Larry Finger<Larry.Finger@...inger.net>
> Cc: George Kashperko<george@...u.edu.ua>
> Cc: Arend van Spriel<arend@...adcom.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: Russell King<rmk@....linux.org.uk>
> Cc: Arnd Bergmann<arnd@...db.de>
> Cc: Andy Botting<andy@...ybotting.com>
> Cc: linuxdriverproject<devel@...uxdriverproject.org>
> Cc: linux-kernel@...r.kernel.org<linux-kernel@...r.kernel.org>
> Signed-off-by: Rafał Miłecki<zajec5@...il.com>
> ---
> Greg: is this what you expected from dynamic allocation and documentation?
>
> Did I miss any other comments about something to change?
>
> V2: Rename to axi
> Use DEFINE_PCI_DEVICE_TABLE in bridge
> Make use of pr_fmt and pr_*
> Store core class
> Rename bridge to not b43 specific
> Replace magic 0x1000 with BCMAI_CORE_SIZE
> Remove some old "ssb" names and defines
> Move BCMAI_ADDR_BASE def
> Add drvdata field
> V3: Fix reloading (kfree issue)
> Add 14e4:0x4331
> Fix non-initialized struct issue
> Drop useless inline functions wrappers for pci core drv
> Proper pr_* usage
> V3.1: Include forgotten changes (pr_* and include related)
> Explain why we dare to implement empty release function
> V4: Add ABI documentation
> Move struct device to wrapper and alloc it dynamically
> checkpatch.pl pointed fixes
> ---
> Documentation/ABI/testing/sysfs-bus-axi | 31 +++
> drivers/Kconfig | 2 +
> drivers/Makefile | 1 +
> drivers/axi/Kconfig | 33 +++
> drivers/axi/Makefile | 7 +
> drivers/axi/TODO | 3 +
> drivers/axi/axi_pci_bridge.c | 33 +++
> drivers/axi/axi_private.h | 37 +++
> drivers/axi/core.c | 51 ++++
> drivers/axi/driver_chipcommon.c | 87 +++++++
> drivers/axi/driver_chipcommon_pmu.c | 134 ++++++++++
> drivers/axi/driver_pci.c | 163 ++++++++++++
> drivers/axi/host_pci.c | 178 +++++++++++++
> drivers/axi/main.c | 271 ++++++++++++++++++++
> drivers/axi/scan.c | 392 +++++++++++++++++++++++++++++
> drivers/axi/scan.h | 56 ++++
> include/linux/axi/axi.h | 227 +++++++++++++++++
> include/linux/axi/axi_driver_chipcommon.h | 308 ++++++++++++++++++++++
> include/linux/axi/axi_driver_pci.h | 89 +++++++
> include/linux/axi/axi_regs.h | 34 +++
> include/linux/mod_devicetable.h | 17 ++
> scripts/mod/file2alias.c | 21 ++
> 22 files changed, 2175 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/ABI/testing/sysfs-bus-axi
> create mode 100644 drivers/axi/Kconfig
> create mode 100644 drivers/axi/Makefile
> create mode 100644 drivers/axi/TODO
> create mode 100644 drivers/axi/axi_pci_bridge.c
> create mode 100644 drivers/axi/axi_private.h
> create mode 100644 drivers/axi/core.c
> create mode 100644 drivers/axi/driver_chipcommon.c
> create mode 100644 drivers/axi/driver_chipcommon_pmu.c
> create mode 100644 drivers/axi/driver_pci.c
> create mode 100644 drivers/axi/host_pci.c
> create mode 100644 drivers/axi/main.c
> create mode 100644 drivers/axi/scan.c
> create mode 100644 drivers/axi/scan.h
> create mode 100644 include/linux/axi/axi.h
> create mode 100644 include/linux/axi/axi_driver_chipcommon.h
> create mode 100644 include/linux/axi/axi_driver_pci.h
> create mode 100644 include/linux/axi/axi_regs.h
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-axi b/Documentation/ABI/testing/sysfs-bus-axi
> new file mode 100644
> index 0000000..6223612
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-axi
> @@ -0,0 +1,31 @@
> +What: /sys/bus/axi/devices/.../class
> +Date: April 2011
> +KernelVersion: 2.6.40
> +Contact: Rafał Miłecki<zajec5@...il.com>
> +Description:
> + Each AXI core is identified by few fields, including class it
> + belongs to. See include/linux/axi/axi.h for possible values.
> +
> +What: /sys/bus/axi/devices/.../manuf
> +Date: April 2011
> +KernelVersion: 2.6.40
> +Contact: Rafał Miłecki<zajec5@...il.com>
> +Description:
> + Each AXI core has it's manufacturer id. See
> + include/linux/axi/axi.h for possible values.
> +
> +What: /sys/bus/axi/devices/.../rev
> +Date: April 2011
> +KernelVersion: 2.6.40
> +Contact: Rafał Miłecki<zajec5@...il.com>
> +Description:
> + AXI cores of the same type can still slightly differ depending
> + on their revision. Use it for detailed programming.
> +
> +What: /sys/bus/axi/devices/.../id
> +Date: April 2011
> +KernelVersion: 2.6.40
> +Contact: Rafał Miłecki<zajec5@...il.com>
> +Description:
> + There are a few types of AXI cores, they can be identified by
> + id field.
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 177c7d1..1244e8c 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -68,6 +68,8 @@ source "drivers/watchdog/Kconfig"
>
> source "drivers/ssb/Kconfig"
>
> +source "drivers/axi/Kconfig"
> +
> source "drivers/mfd/Kconfig"
>
> source "drivers/regulator/Kconfig"
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 3f135b6..6e1979b 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -110,6 +110,7 @@ obj-$(CONFIG_HID) += hid/
> obj-$(CONFIG_PPC_PS3) += ps3/
> obj-$(CONFIG_OF) += of/
> obj-$(CONFIG_SSB) += ssb/
> +obj-$(CONFIG_AXI) += axi/
> obj-$(CONFIG_VHOST_NET) += vhost/
> obj-$(CONFIG_VLYNQ) += vlynq/
> obj-$(CONFIG_STAGING) += staging/
> diff --git a/drivers/axi/Kconfig b/drivers/axi/Kconfig
> new file mode 100644
> index 0000000..6221af0
> --- /dev/null
> +++ b/drivers/axi/Kconfig
> @@ -0,0 +1,33 @@
> +config AXI_POSSIBLE
> + bool
> + depends on HAS_IOMEM&& HAS_DMA
> + default y
> +
> +menu "AMBA AXI"
> + depends on AXI_POSSIBLE
> +
> +config AXI
> + tristate "AXI support"
> + depends on AXI_POSSIBLE
> + help
> + Bus driver for one of the Advanced Microcontroller Bus Architecture
> + interfaces: Advanced eXtensible Interface.
> +
> +config AXI_HOST_PCI_POSSIBLE
> + bool
> + depends on AXI&& PCI = y
> + default y
> +
> +config AXI_HOST_PCI
> + bool "Support for AXI on PCI-host bus"
> + depends on AXI_HOST_PCI_POSSIBLE
> +
> +config AXI_DEBUG
> + bool "AXI debugging"
> + depends on AXI
> + help
> + This turns on additional debugging messages.
> +
> + If unsure, say N
> +
> +endmenu
> diff --git a/drivers/axi/Makefile b/drivers/axi/Makefile
> new file mode 100644
> index 0000000..50d6797
> --- /dev/null
> +++ b/drivers/axi/Makefile
> @@ -0,0 +1,7 @@
> +axi-y += main.o scan.o core.o
> +axi-y += driver_chipcommon.o driver_chipcommon_pmu.o
> +axi-y += driver_pci.o
> +axi-$(CONFIG_AXI_HOST_PCI) += host_pci.o axi_pci_bridge.o
> +obj-$(CONFIG_AXI) += axi.o
> +
> +ccflags-$(CONFIG_AXI_DEBUG) := -DDEBUG
> diff --git a/drivers/axi/TODO b/drivers/axi/TODO
> new file mode 100644
> index 0000000..5190336
> --- /dev/null
> +++ b/drivers/axi/TODO
> @@ -0,0 +1,3 @@
> +- Interrupts
> +- Defines for PCI core driver
> +- Convert axi_bus->cores into linked list
> diff --git a/drivers/axi/axi_pci_bridge.c b/drivers/axi/axi_pci_bridge.c
> new file mode 100644
> index 0000000..17e882c
> --- /dev/null
> +++ b/drivers/axi/axi_pci_bridge.c
> @@ -0,0 +1,33 @@
> +/*
> + * AXI PCI bridge module
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include "axi_private.h"
> +
> +#include<linux/axi/axi.h>
> +#include<linux/pci.h>
> +
> +static DEFINE_PCI_DEVICE_TABLE(axi_pci_bridge_tbl) = {
> + { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
> + { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
> + { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
> + { 0, },
> +};
> +MODULE_DEVICE_TABLE(pci, axi_pci_bridge_tbl);
> +
> +static struct pci_driver axi_pci_bridge_driver = {
> + .name = "axi-pci-bridge",
> + .id_table = axi_pci_bridge_tbl,
> +};
> +
> +int __init axi_pci_bridge_init(void)
> +{
> + return axi_host_pci_register(&axi_pci_bridge_driver);
> +}
> +
> +void __exit axi_pci_bridge_exit(void)
> +{
> + axi_host_pci_unregister(&axi_pci_bridge_driver);
> +}
> diff --git a/drivers/axi/axi_private.h b/drivers/axi/axi_private.h
> new file mode 100644
> index 0000000..756efb6
> --- /dev/null
> +++ b/drivers/axi/axi_private.h
> @@ -0,0 +1,37 @@
> +#ifndef LINUX_AXI_PRIVATE_H_
> +#define LINUX_AXI_PRIVATE_H_
> +
> +#ifndef pr_fmt
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +#endif
> +
> +#include<linux/axi/axi.h>
> +
> +#define AXI_ADDR_BASE 0x18000000
> +#define AXI_WRAP_BASE 0x18100000
> +
> +#define AXI_CORE_SIZE 0x1000
> +
> +struct axi_bus;
> +
> +/* main.c */
> +extern int axi_bus_register(struct axi_bus *bus);
> +extern void axi_bus_unregister(struct axi_bus *bus);
> +
> +/* scan.c */
> +int axi_bus_scan(struct axi_bus *bus);
> +
> +#ifdef CONFIG_AXI_HOST_PCI
> +/* b43_pci_ai_bridge.c */
> +extern int __init axi_pci_bridge_init(void);
> +extern void __exit axi_pci_bridge_exit(void);
> +
> +/* host_pci.c */
> +extern int axi_host_pci_register(struct pci_driver *driver);
> +static inline void axi_host_pci_unregister(struct pci_driver *driver)
> +{
> + pci_unregister_driver(driver);
> +}
> +#endif /* CONFIG_AXI_HOST_PCI */
> +
> +#endif
> diff --git a/drivers/axi/core.c b/drivers/axi/core.c
> new file mode 100644
> index 0000000..3d79749
> --- /dev/null
> +++ b/drivers/axi/core.c
> @@ -0,0 +1,51 @@
> +/*
> + * AMBA AXI
> + * Core ops
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include "axi_private.h"
> +#include<linux/axi/axi.h>
#include <linux/delay.h>
> +
> +bool axi_core_is_enabled(struct axi_device *core)
> +{
> + if ((axi_aread32(core, AXI_IOCTL)& (AXI_IOCTL_CLK | AXI_IOCTL_FGC))
> + != AXI_IOCTL_CLK)
> + return false;
> + if (axi_aread32(core, AXI_RESET_CTL)& AXI_RESET_CTL_RESET)
> + return false;
> + return true;
> +}
> +EXPORT_SYMBOL(axi_core_is_enabled);
> +
> +static void axi_core_disable(struct axi_device *core, u32 flags)
> +{
> + if (axi_aread32(core, AXI_RESET_CTL)& AXI_RESET_CTL_RESET)
> + return;
> +
> + axi_awrite32(core, AXI_IOCTL, flags);
> + axi_aread32(core, AXI_IOCTL);
> + udelay(10);
> +
> + axi_awrite32(core, AXI_RESET_CTL, AXI_RESET_CTL_RESET);
> + udelay(1);
> +}
> +
> +int axi_core_enable(struct axi_device *core, u32 flags)
> +{
> + axi_core_disable(core, flags);
> +
> + axi_awrite32(core, AXI_IOCTL, (AXI_IOCTL_CLK | AXI_IOCTL_FGC | flags));
> + axi_aread32(core, AXI_IOCTL);
> +
> + axi_awrite32(core, AXI_RESET_CTL, 0);
> + udelay(1);
> +
> + axi_awrite32(core, AXI_IOCTL, (AXI_IOCTL_CLK | flags));
> + axi_aread32(core, AXI_IOCTL);
> + udelay(1);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL(axi_core_enable);
> diff --git a/drivers/axi/driver_chipcommon.c b/drivers/axi/driver_chipcommon.c
> new file mode 100644
> index 0000000..b3087df
> --- /dev/null
> +++ b/drivers/axi/driver_chipcommon.c
> @@ -0,0 +1,87 @@
> +/*
> + * AMBA AXI
> + * ChipCommon core driver
> + *
> + * Copyright 2005, Broadcom Corporation
> + * Copyright 2006, 2007, Michael Buesch<mb@...sch.de>
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include "axi_private.h"
> +#include<linux/axi/axi.h>
> +
> +static inline u32 axi_cc_write32_masked(struct axi_drv_cc *cc, u16 offset,
> + u32 mask, u32 value)
> +{
> + value&= mask;
> + value |= axi_cc_read32(cc, offset)& ~mask;
> + axi_cc_write32(cc, offset, value);
> +
> + return value;
> +}
> +
> +void axi_core_chipcommon_init(struct axi_drv_cc *cc)
> +{
> + if (cc->core->id.rev>= 11)
> + cc->status = axi_cc_read32(cc, AXI_CC_CHIPSTAT);
> + cc->capabilities = axi_cc_read32(cc, AXI_CC_CAP);
> + if (cc->core->id.rev>= 35)
> + cc->capabilities_ext = axi_cc_read32(cc, AXI_CC_CAP_EXT);
> +
> + axi_cc_write32(cc, 0x58, 0);
> + axi_cc_write32(cc, 0x5C, 0);
> +
> + if (cc->capabilities& AXI_CC_CAP_PMU)
> + axi_pmu_init(cc);
> + if (cc->capabilities& AXI_CC_CAP_PCTL)
> + pr_err("Power control not implemented!\n");
> +}
> +
> +/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
> +void axi_chipco_watchdog_timer_set(struct axi_drv_cc *cc, u32 ticks)
> +{
> + /* instant NMI */
> + axi_cc_write32(cc, AXI_CC_WATCHDOG, ticks);
> +}
> +
> +void axi_chipco_irq_mask(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + axi_cc_write32_masked(cc, AXI_CC_IRQMASK, mask, value);
> +}
> +
> +u32 axi_chipco_irq_status(struct axi_drv_cc *cc, u32 mask)
> +{
> + return axi_cc_read32(cc, AXI_CC_IRQSTAT)& mask;
> +}
> +
> +u32 axi_chipco_gpio_in(struct axi_drv_cc *cc, u32 mask)
> +{
> + return axi_cc_read32(cc, AXI_CC_GPIOIN)& mask;
> +}
> +
> +u32 axi_chipco_gpio_out(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + return axi_cc_write32_masked(cc, AXI_CC_GPIOOUT, mask, value);
> +}
> +
> +u32 axi_chipco_gpio_outen(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + return axi_cc_write32_masked(cc, AXI_CC_GPIOOUTEN, mask, value);
> +}
> +
> +u32 xaxi_chipco_gpio_control(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + return axi_cc_write32_masked(cc, AXI_CC_GPIOCTL, mask, value);
> +}
> +EXPORT_SYMBOL(xaxi_chipco_gpio_control);
> +
> +u32 axi_chipco_gpio_intmask(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + return axi_cc_write32_masked(cc, AXI_CC_GPIOIRQ, mask, value);
> +}
> +
> +u32 axi_chipco_gpio_polarity(struct axi_drv_cc *cc, u32 mask, u32 value)
> +{
> + return axi_cc_write32_masked(cc, AXI_CC_GPIOPOL, mask, value);
> +}
> diff --git a/drivers/axi/driver_chipcommon_pmu.c b/drivers/axi/driver_chipcommon_pmu.c
> new file mode 100644
> index 0000000..b57a9d0
> --- /dev/null
> +++ b/drivers/axi/driver_chipcommon_pmu.c
> @@ -0,0 +1,134 @@
> +/*
> + * AMBA AXI
> + * ChipCommon Power Management Unit driver
> + *
> + * Copyright 2009, Michael Buesch<mb@...sch.de>
> + * Copyright 2007, Broadcom Corporation
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include "axi_private.h"
> +#include<linux/axi/axi.h>
> +
> +static void axi_chipco_chipctl_maskset(struct axi_drv_cc *cc,
> + u32 offset, u32 mask, u32 set)
> +{
> + u32 value;
> +
> + axi_cc_read32(cc, AXI_CC_CHIPCTL_ADDR);
> + axi_cc_write32(cc, AXI_CC_CHIPCTL_ADDR, offset);
> + axi_cc_read32(cc, AXI_CC_CHIPCTL_ADDR);
> + value = axi_cc_read32(cc, AXI_CC_CHIPCTL_DATA);
> + value&= mask;
> + value |= set;
> + axi_cc_write32(cc, AXI_CC_CHIPCTL_DATA, value);
> + axi_cc_read32(cc, AXI_CC_CHIPCTL_DATA);
> +}
> +
> +static void axi_pmu_pll_init(struct axi_drv_cc *cc)
> +{
> + struct axi_bus *bus = cc->core->bus;
> +
> + switch (bus->chipinfo.id) {
> + case 0x4313:
> + case 0x4331:
> + case 43224:
> + case 43225:
> + break;
> + default:
> + pr_err("PLL init unknown for device 0x%04X\n",
> + bus->chipinfo.id);
> + }
> +}
> +
> +static void axi_pmu_resources_init(struct axi_drv_cc *cc)
> +{
> + struct axi_bus *bus = cc->core->bus;
> + u32 min_msk = 0, max_msk = 0;
> +
> + switch (bus->chipinfo.id) {
> + case 0x4313:
> + min_msk = 0x200D;
> + max_msk = 0xFFFF;
> + break;
> + case 43224:
> + break;
> + default:
> + pr_err("PMU resource config unknown for device 0x%04X\n",
> + bus->chipinfo.id);
> + }
> +
> + /* Set the resource masks. */
> + if (min_msk)
> + axi_cc_write32(cc, AXI_CC_PMU_MINRES_MSK, min_msk);
> + if (max_msk)
> + axi_cc_write32(cc, AXI_CC_PMU_MAXRES_MSK, max_msk);
> +}
> +
> +void axi_pmu_swreg_init(struct axi_drv_cc *cc)
> +{
> + struct axi_bus *bus = cc->core->bus;
> +
> + switch (bus->chipinfo.id) {
> + case 0x4313:
> + case 0x4331:
> + case 43224:
> + break;
> + default:
> + pr_err("PMU switch/regulators init unknown for device "
> + "0x%04X\n", bus->chipinfo.id);
> + }
> +}
> +
> +void axi_pmu_workarounds(struct axi_drv_cc *cc)
> +{
> + struct axi_bus *bus = cc->core->bus;
> +
> + switch (bus->chipinfo.id) {
> + case 0x4313:
> + axi_chipco_chipctl_maskset(cc, 0, ~0, 0x7);
> + break;
> + case 0x4331:
> + pr_err("Enabling Ext PA lines not implemented\n");
> + break;
> + case 43224:
> + if (bus->chipinfo.rev == 0) {
> + pr_err("Workarounds for 43224 rev 0 not fully "
> + "implemented\n");
> + axi_chipco_chipctl_maskset(cc, 0, ~0, 0xF0);
> + } else {
> + axi_chipco_chipctl_maskset(cc, 0, ~0, 0xF0);
> + }
> + break;
> + default:
> + pr_err("Workarounds unknown for device 0x%04X\n",
> + bus->chipinfo.id);
> + }
> +}
> +
> +void axi_pmu_init(struct axi_drv_cc *cc)
> +{
> + u32 pmucap;
> +
> + pmucap = axi_cc_read32(cc, AXI_CC_PMU_CAP);
> + cc->pmu.rev = (pmucap& AXI_CC_PMU_CAP_REVISION);
> +
> + pr_debug("Found rev %u PMU (capabilities 0x%08X)\n", cc->pmu.rev,
> + pmucap);
> +
> + if (cc->pmu.rev == 1)
> + axi_cc_mask32(cc, AXI_CC_PMU_CTL,
> + ~AXI_CC_PMU_CTL_NOILPONW);
> + else
> + axi_cc_set32(cc, AXI_CC_PMU_CTL,
> + AXI_CC_PMU_CTL_NOILPONW);
> +
> + if (cc->core->id.id == 0x4329&& cc->core->id.rev == 2)
> + pr_err("Fix for 4329b0 bad LPOM state not implemented!\n");
> +
> + axi_pmu_pll_init(cc);
> + axi_pmu_resources_init(cc);
> + axi_pmu_swreg_init(cc);
> + axi_pmu_workarounds(cc);
> +}
> diff --git a/drivers/axi/driver_pci.c b/drivers/axi/driver_pci.c
> new file mode 100644
> index 0000000..fc4ab25
> --- /dev/null
> +++ b/drivers/axi/driver_pci.c
> @@ -0,0 +1,163 @@
> +/*
> + * AMBA AXI
> + * PCI Core
> + *
> + * Copyright 2005, Broadcom Corporation
> + * Copyright 2006, 2007, Michael Buesch<mb@...sch.de>
> + *
> + * Licensed under the GNU/GPL. See COPYING for details.
> + */
> +
> +#include "axi_private.h"
> +#include<linux/axi/axi.h>
#include <linux/delay.h>
Are you compiling for i386 architecture? For some reason, delay.h is not
included for my x86_64 system, and the include is needed for core.c and
driver_pci.c.
Larry
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