// SPDX-License-Identifier: GPL-2.0-or-later /* * Fake VME bridge support. * * This drive provides a fake VME bridge chip, this enables debugging of the * VME framework in the absence of a VME system. * * This driver has to do a number of things in software that would be driven * by hardware if it was available, it will also result in extra overhead at * times when compared with driving actual hardware. * * Author: Martyn Welch <[email protected]> * Copyright (c) 2014 Martyn Welch * * Based on vme_tsi148.c: * * Author: Martyn Welch <[email protected]> * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. * * Based on work by Tom Armistead and Ajit Prem * Copyright 2004 Motorola Inc. */ #include <linux/device.h> #include <linux/errno.h> #include <linux/interrupt.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/types.h> #include "vme.h" #include "vme_bridge.h" /* * Define the number of each that the fake driver supports. */ #define FAKE_MAX_MASTER … #define FAKE_MAX_SLAVE … /* Structures to hold information normally held in device registers */ struct fake_slave_window { … }; struct fake_master_window { … }; /* Structure used to hold driver specific information */ struct fake_driver { … }; /* Module parameter */ static int geoid; static const char driver_name[] = …; static struct vme_bridge *exit_pointer; static struct device *vme_root; /* * Calling VME bus interrupt callback if provided. */ static void fake_VIRQ_tasklet(unsigned long data) { … } /* * Configure VME interrupt */ static void fake_irq_set(struct vme_bridge *fake_bridge, int level, int state, int sync) { … } static void *fake_pci_to_ptr(dma_addr_t addr) { … } static dma_addr_t fake_ptr_to_pci(void *addr) { … } /* * Generate a VME bus interrupt at the requested level & vector. Wait for * interrupt to be acked. */ static int fake_irq_generate(struct vme_bridge *fake_bridge, int level, int statid) { … } /* * Initialize a slave window with the requested attributes. */ static int fake_slave_set(struct vme_slave_resource *image, int enabled, unsigned long long vme_base, unsigned long long size, dma_addr_t buf_base, u32 aspace, u32 cycle) { … } /* * Get slave window configuration. */ static int fake_slave_get(struct vme_slave_resource *image, int *enabled, unsigned long long *vme_base, unsigned long long *size, dma_addr_t *buf_base, u32 *aspace, u32 *cycle) { … } /* * Set the attributes of an outbound window. */ static int fake_master_set(struct vme_master_resource *image, int enabled, unsigned long long vme_base, unsigned long long size, u32 aspace, u32 cycle, u32 dwidth) { … } /* * Set the attributes of an outbound window. */ static int __fake_master_get(struct vme_master_resource *image, int *enabled, unsigned long long *vme_base, unsigned long long *size, u32 *aspace, u32 *cycle, u32 *dwidth) { … } static int fake_master_get(struct vme_master_resource *image, int *enabled, unsigned long long *vme_base, unsigned long long *size, u32 *aspace, u32 *cycle, u32 *dwidth) { … } static void fake_lm_check(struct fake_driver *bridge, unsigned long long addr, u32 aspace, u32 cycle) { … } static noinline_for_stack u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr, u32 aspace, u32 cycle) { … } static noinline_for_stack u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr, u32 aspace, u32 cycle) { … } static noinline_for_stack u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr, u32 aspace, u32 cycle) { … } static ssize_t fake_master_read(struct vme_master_resource *image, void *buf, size_t count, loff_t offset) { … } static noinline_for_stack void fake_vmewrite8(struct fake_driver *bridge, u8 *buf, unsigned long long addr, u32 aspace, u32 cycle) { … } static noinline_for_stack void fake_vmewrite16(struct fake_driver *bridge, u16 *buf, unsigned long long addr, u32 aspace, u32 cycle) { … } static noinline_for_stack void fake_vmewrite32(struct fake_driver *bridge, u32 *buf, unsigned long long addr, u32 aspace, u32 cycle) { … } static ssize_t fake_master_write(struct vme_master_resource *image, void *buf, size_t count, loff_t offset) { … } /* * Perform an RMW cycle on the VME bus. * * Requires a previously configured master window, returns final value. */ static unsigned int fake_master_rmw(struct vme_master_resource *image, unsigned int mask, unsigned int compare, unsigned int swap, loff_t offset) { … } /* * All 4 location monitors reside at the same base - this is therefore a * system wide configuration. * * This does not enable the LM monitor - that should be done when the first * callback is attached and disabled when the last callback is removed. */ static int fake_lm_set(struct vme_lm_resource *lm, unsigned long long lm_base, u32 aspace, u32 cycle) { … } /* Get configuration of the callback monitor and return whether it is enabled * or disabled. */ static int fake_lm_get(struct vme_lm_resource *lm, unsigned long long *lm_base, u32 *aspace, u32 *cycle) { … } /* * Attach a callback to a specific location monitor. * * Callback will be passed the monitor triggered. */ static int fake_lm_attach(struct vme_lm_resource *lm, int monitor, void (*callback)(void *), void *data) { … } /* * Detach a callback function forn a specific location monitor. */ static int fake_lm_detach(struct vme_lm_resource *lm, int monitor) { … } /* * Determine Geographical Addressing */ static int fake_slot_get(struct vme_bridge *fake_bridge) { … } static void *fake_alloc_consistent(struct device *parent, size_t size, dma_addr_t *dma) { … } static void fake_free_consistent(struct device *parent, size_t size, void *vaddr, dma_addr_t dma) { … } /* * Configure CR/CSR space * * Access to the CR/CSR can be configured at power-up. The location of the * CR/CSR registers in the CR/CSR address space is determined by the boards * Geographic address. * * Each board has a 512kB window, with the highest 4kB being used for the * boards registers, this means there is a fix length 508kB window which must * be mapped onto PCI memory. */ static int fake_crcsr_init(struct vme_bridge *fake_bridge) { … } static void fake_crcsr_exit(struct vme_bridge *fake_bridge) { … } static int __init fake_init(void) { … } static void __exit fake_exit(void) { … } MODULE_PARM_DESC(…) …; module_param(geoid, int, 0); MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; module_init(…) …; module_exit(fake_exit);
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