![Wei Yongjun](/assets/img/avatar_default.png)
image->lock is unlocked in some error handling path without take the
lock, so remove those unexpected unlock.
Fixes: 658bcdae9c
("vme: Adding Fake VME driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1307 lines
30 KiB
C
1307 lines
30 KiB
C
/*
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* Fake VME bridge support.
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*
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* This drive provides a fake VME bridge chip, this enables debugging of the
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* VME framework in the absence of a VME system.
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*
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* This driver has to do a number of things in software that would be driven
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* by hardware if it was available, it will also result in extra overhead at
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* times when compared with driving actual hardware.
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*
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* Author: Martyn Welch <martyn@welches.me.uk>
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* Copyright (c) 2014 Martyn Welch
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*
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* Based on vme_tsi148.c:
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*
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* Author: Martyn Welch <martyn.welch@ge.com>
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* Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
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*
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* Based on work by Tom Armistead and Ajit Prem
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* Copyright 2004 Motorola Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/vme.h>
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#include "../vme_bridge.h"
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/*
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* Define the number of each that the fake driver supports.
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*/
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#define FAKE_MAX_MASTER 8 /* Max Master Windows */
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#define FAKE_MAX_SLAVE 8 /* Max Slave Windows */
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/* Structures to hold information normally held in device registers */
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struct fake_slave_window {
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int enabled;
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unsigned long long vme_base;
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unsigned long long size;
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void *buf_base;
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u32 aspace;
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u32 cycle;
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};
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struct fake_master_window {
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int enabled;
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unsigned long long vme_base;
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unsigned long long size;
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u32 aspace;
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u32 cycle;
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u32 dwidth;
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};
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/* Structure used to hold driver specific information */
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struct fake_driver {
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struct vme_bridge *parent;
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struct fake_slave_window slaves[FAKE_MAX_SLAVE];
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struct fake_master_window masters[FAKE_MAX_MASTER];
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u32 lm_enabled;
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unsigned long long lm_base;
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u32 lm_aspace;
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u32 lm_cycle;
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void (*lm_callback[4])(void *);
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void *lm_data[4];
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struct tasklet_struct int_tasklet;
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int int_level;
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int int_statid;
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void *crcsr_kernel;
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dma_addr_t crcsr_bus;
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/* Only one VME interrupt can be generated at a time, provide locking */
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struct mutex vme_int;
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};
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/* Module parameter */
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static int geoid;
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static const char driver_name[] = "vme_fake";
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static struct vme_bridge *exit_pointer;
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static struct device *vme_root;
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/*
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* Calling VME bus interrupt callback if provided.
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*/
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static void fake_VIRQ_tasklet(unsigned long data)
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{
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struct vme_bridge *fake_bridge;
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struct fake_driver *bridge;
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fake_bridge = (struct vme_bridge *) data;
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bridge = fake_bridge->driver_priv;
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vme_irq_handler(fake_bridge, bridge->int_level, bridge->int_statid);
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}
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/*
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* Configure VME interrupt
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*/
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static void fake_irq_set(struct vme_bridge *fake_bridge, int level,
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int state, int sync)
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{
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/* Nothing to do */
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}
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static void *fake_pci_to_ptr(dma_addr_t addr)
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{
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return (void *)(uintptr_t)addr;
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}
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static dma_addr_t fake_ptr_to_pci(void *addr)
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{
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return (dma_addr_t)(uintptr_t)addr;
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}
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/*
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* Generate a VME bus interrupt at the requested level & vector. Wait for
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* interrupt to be acked.
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*/
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static int fake_irq_generate(struct vme_bridge *fake_bridge, int level,
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int statid)
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{
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struct fake_driver *bridge;
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bridge = fake_bridge->driver_priv;
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mutex_lock(&bridge->vme_int);
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bridge->int_level = level;
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bridge->int_statid = statid;
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/*
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* Schedule tasklet to run VME handler to emulate normal VME interrupt
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* handler behaviour.
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*/
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tasklet_schedule(&bridge->int_tasklet);
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mutex_unlock(&bridge->vme_int);
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return 0;
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}
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/*
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* Initialize a slave window with the requested attributes.
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*/
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static int fake_slave_set(struct vme_slave_resource *image, int enabled,
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unsigned long long vme_base, unsigned long long size,
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dma_addr_t buf_base, u32 aspace, u32 cycle)
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{
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unsigned int i, granularity = 0;
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unsigned long long vme_bound;
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struct vme_bridge *fake_bridge;
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struct fake_driver *bridge;
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fake_bridge = image->parent;
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bridge = fake_bridge->driver_priv;
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i = image->number;
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switch (aspace) {
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case VME_A16:
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granularity = 0x10;
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break;
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case VME_A24:
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granularity = 0x1000;
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break;
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case VME_A32:
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granularity = 0x10000;
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break;
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case VME_A64:
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granularity = 0x10000;
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break;
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case VME_CRCSR:
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case VME_USER1:
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case VME_USER2:
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case VME_USER3:
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case VME_USER4:
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default:
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pr_err("Invalid address space\n");
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return -EINVAL;
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}
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/*
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* Bound address is a valid address for the window, adjust
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* accordingly
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*/
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vme_bound = vme_base + size - granularity;
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if (vme_base & (granularity - 1)) {
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pr_err("Invalid VME base alignment\n");
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return -EINVAL;
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}
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if (vme_bound & (granularity - 1)) {
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pr_err("Invalid VME bound alignment\n");
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return -EINVAL;
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}
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mutex_lock(&image->mtx);
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bridge->slaves[i].enabled = enabled;
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bridge->slaves[i].vme_base = vme_base;
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bridge->slaves[i].size = size;
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bridge->slaves[i].buf_base = fake_pci_to_ptr(buf_base);
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bridge->slaves[i].aspace = aspace;
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bridge->slaves[i].cycle = cycle;
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mutex_unlock(&image->mtx);
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return 0;
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}
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/*
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* Get slave window configuration.
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*/
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static int fake_slave_get(struct vme_slave_resource *image, int *enabled,
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unsigned long long *vme_base, unsigned long long *size,
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dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
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{
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unsigned int i;
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struct fake_driver *bridge;
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bridge = image->parent->driver_priv;
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i = image->number;
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mutex_lock(&image->mtx);
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*enabled = bridge->slaves[i].enabled;
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*vme_base = bridge->slaves[i].vme_base;
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*size = bridge->slaves[i].size;
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*buf_base = fake_ptr_to_pci(bridge->slaves[i].buf_base);
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*aspace = bridge->slaves[i].aspace;
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*cycle = bridge->slaves[i].cycle;
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mutex_unlock(&image->mtx);
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return 0;
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}
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/*
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* Set the attributes of an outbound window.
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*/
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static int fake_master_set(struct vme_master_resource *image, int enabled,
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unsigned long long vme_base, unsigned long long size,
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u32 aspace, u32 cycle, u32 dwidth)
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{
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int retval = 0;
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unsigned int i;
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struct vme_bridge *fake_bridge;
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struct fake_driver *bridge;
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fake_bridge = image->parent;
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bridge = fake_bridge->driver_priv;
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/* Verify input data */
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if (vme_base & 0xFFFF) {
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pr_err("Invalid VME Window alignment\n");
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retval = -EINVAL;
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goto err_window;
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}
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if (size & 0xFFFF) {
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pr_err("Invalid size alignment\n");
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retval = -EINVAL;
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goto err_window;
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}
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if ((size == 0) && (enabled != 0)) {
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pr_err("Size must be non-zero for enabled windows\n");
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retval = -EINVAL;
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goto err_window;
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}
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/* Setup data width */
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switch (dwidth) {
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case VME_D8:
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case VME_D16:
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case VME_D32:
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break;
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default:
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pr_err("Invalid data width\n");
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retval = -EINVAL;
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goto err_dwidth;
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}
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/* Setup address space */
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switch (aspace) {
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case VME_A16:
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case VME_A24:
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case VME_A32:
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case VME_A64:
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case VME_CRCSR:
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case VME_USER1:
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case VME_USER2:
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case VME_USER3:
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case VME_USER4:
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break;
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default:
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pr_err("Invalid address space\n");
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retval = -EINVAL;
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goto err_aspace;
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}
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spin_lock(&image->lock);
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i = image->number;
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bridge->masters[i].enabled = enabled;
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bridge->masters[i].vme_base = vme_base;
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bridge->masters[i].size = size;
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bridge->masters[i].aspace = aspace;
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bridge->masters[i].cycle = cycle;
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bridge->masters[i].dwidth = dwidth;
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spin_unlock(&image->lock);
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return 0;
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err_aspace:
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err_dwidth:
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err_window:
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return retval;
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}
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/*
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* Set the attributes of an outbound window.
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*/
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static int __fake_master_get(struct vme_master_resource *image, int *enabled,
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unsigned long long *vme_base, unsigned long long *size,
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u32 *aspace, u32 *cycle, u32 *dwidth)
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{
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unsigned int i;
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struct fake_driver *bridge;
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bridge = image->parent->driver_priv;
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i = image->number;
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*enabled = bridge->masters[i].enabled;
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*vme_base = bridge->masters[i].vme_base;
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*size = bridge->masters[i].size;
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*aspace = bridge->masters[i].aspace;
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*cycle = bridge->masters[i].cycle;
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*dwidth = bridge->masters[i].dwidth;
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return 0;
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}
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static int fake_master_get(struct vme_master_resource *image, int *enabled,
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unsigned long long *vme_base, unsigned long long *size,
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u32 *aspace, u32 *cycle, u32 *dwidth)
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{
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int retval;
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spin_lock(&image->lock);
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retval = __fake_master_get(image, enabled, vme_base, size, aspace,
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cycle, dwidth);
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spin_unlock(&image->lock);
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return retval;
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}
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static void fake_lm_check(struct fake_driver *bridge, unsigned long long addr,
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u32 aspace, u32 cycle)
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{
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struct vme_bridge *fake_bridge;
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unsigned long long lm_base;
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u32 lm_aspace, lm_cycle;
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int i;
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struct vme_lm_resource *lm;
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struct list_head *pos = NULL, *n;
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/* Get vme_bridge */
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fake_bridge = bridge->parent;
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/* Loop through each location monitor resource */
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list_for_each_safe(pos, n, &fake_bridge->lm_resources) {
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lm = list_entry(pos, struct vme_lm_resource, list);
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/* If disabled, we're done */
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if (bridge->lm_enabled == 0)
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return;
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lm_base = bridge->lm_base;
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lm_aspace = bridge->lm_aspace;
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lm_cycle = bridge->lm_cycle;
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/* First make sure that the cycle and address space match */
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if ((lm_aspace == aspace) && (lm_cycle == cycle)) {
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for (i = 0; i < lm->monitors; i++) {
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/* Each location monitor covers 8 bytes */
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if (((lm_base + (8 * i)) <= addr) &&
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((lm_base + (8 * i) + 8) > addr)) {
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if (bridge->lm_callback[i] != NULL)
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bridge->lm_callback[i](
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bridge->lm_data[i]);
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}
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}
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}
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}
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}
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static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
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u32 aspace, u32 cycle)
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{
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u8 retval = 0xff;
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int i;
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unsigned long long start, end, offset;
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u8 *loc;
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for (i = 0; i < FAKE_MAX_SLAVE; i++) {
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start = bridge->slaves[i].vme_base;
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end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
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if (aspace != bridge->slaves[i].aspace)
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continue;
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if (cycle != bridge->slaves[i].cycle)
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continue;
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if ((addr >= start) && (addr < end)) {
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offset = addr - bridge->slaves[i].vme_base;
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loc = (u8 *)(bridge->slaves[i].buf_base + offset);
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retval = *loc;
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break;
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}
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}
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fake_lm_check(bridge, addr, aspace, cycle);
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return retval;
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}
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static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
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u32 aspace, u32 cycle)
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{
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u16 retval = 0xffff;
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int i;
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unsigned long long start, end, offset;
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u16 *loc;
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for (i = 0; i < FAKE_MAX_SLAVE; i++) {
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if (aspace != bridge->slaves[i].aspace)
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continue;
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if (cycle != bridge->slaves[i].cycle)
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continue;
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start = bridge->slaves[i].vme_base;
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end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
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if ((addr >= start) && ((addr + 1) < end)) {
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offset = addr - bridge->slaves[i].vme_base;
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loc = (u16 *)(bridge->slaves[i].buf_base + offset);
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retval = *loc;
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break;
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}
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}
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fake_lm_check(bridge, addr, aspace, cycle);
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return retval;
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}
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static u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr,
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u32 aspace, u32 cycle)
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{
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u32 retval = 0xffffffff;
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int i;
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unsigned long long start, end, offset;
|
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u32 *loc;
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|
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for (i = 0; i < FAKE_MAX_SLAVE; i++) {
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if (aspace != bridge->slaves[i].aspace)
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continue;
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|
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if (cycle != bridge->slaves[i].cycle)
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continue;
|
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|
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start = bridge->slaves[i].vme_base;
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end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
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|
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if ((addr >= start) && ((addr + 3) < end)) {
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offset = addr - bridge->slaves[i].vme_base;
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loc = (u32 *)(bridge->slaves[i].buf_base + offset);
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retval = *loc;
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break;
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}
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}
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fake_lm_check(bridge, addr, aspace, cycle);
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return retval;
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}
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|
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static ssize_t fake_master_read(struct vme_master_resource *image, void *buf,
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size_t count, loff_t offset)
|
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{
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int retval;
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u32 aspace, cycle, dwidth;
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struct vme_bridge *fake_bridge;
|
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struct fake_driver *priv;
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int i;
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unsigned long long addr;
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unsigned int done = 0;
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unsigned int count32;
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fake_bridge = image->parent;
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priv = fake_bridge->driver_priv;
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i = image->number;
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addr = (unsigned long long)priv->masters[i].vme_base + offset;
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aspace = priv->masters[i].aspace;
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cycle = priv->masters[i].cycle;
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dwidth = priv->masters[i].dwidth;
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|
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spin_lock(&image->lock);
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|
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/* The following code handles VME address alignment. We cannot use
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* memcpy_xxx here because it may cut data transfers in to 8-bit
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* cycles when D16 or D32 cycles are required on the VME bus.
|
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* On the other hand, the bridge itself assures that the maximum data
|
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* cycle configured for the transfer is used and splits it
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* automatically for non-aligned addresses, so we don't want the
|
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* overhead of needlessly forcing small transfers for the entire cycle.
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*/
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if (addr & 0x1) {
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*(u8 *)buf = fake_vmeread8(priv, addr, aspace, cycle);
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done += 1;
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if (done == count)
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goto out;
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}
|
|
if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
|
|
if ((addr + done) & 0x2) {
|
|
if ((count - done) < 2) {
|
|
*(u8 *)(buf + done) = fake_vmeread8(priv,
|
|
addr + done, aspace, cycle);
|
|
done += 1;
|
|
goto out;
|
|
} else {
|
|
*(u16 *)(buf + done) = fake_vmeread16(priv,
|
|
addr + done, aspace, cycle);
|
|
done += 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (dwidth == VME_D32) {
|
|
count32 = (count - done) & ~0x3;
|
|
while (done < count32) {
|
|
*(u32 *)(buf + done) = fake_vmeread32(priv, addr + done,
|
|
aspace, cycle);
|
|
done += 4;
|
|
}
|
|
} else if (dwidth == VME_D16) {
|
|
count32 = (count - done) & ~0x3;
|
|
while (done < count32) {
|
|
*(u16 *)(buf + done) = fake_vmeread16(priv, addr + done,
|
|
aspace, cycle);
|
|
done += 2;
|
|
}
|
|
} else if (dwidth == VME_D8) {
|
|
count32 = (count - done);
|
|
while (done < count32) {
|
|
*(u8 *)(buf + done) = fake_vmeread8(priv, addr + done,
|
|
aspace, cycle);
|
|
done += 1;
|
|
}
|
|
|
|
}
|
|
|
|
if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
|
|
if ((count - done) & 0x2) {
|
|
*(u16 *)(buf + done) = fake_vmeread16(priv, addr + done,
|
|
aspace, cycle);
|
|
done += 2;
|
|
}
|
|
}
|
|
if ((count - done) & 0x1) {
|
|
*(u8 *)(buf + done) = fake_vmeread8(priv, addr + done, aspace,
|
|
cycle);
|
|
done += 1;
|
|
}
|
|
|
|
out:
|
|
retval = count;
|
|
|
|
spin_unlock(&image->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void fake_vmewrite8(struct fake_driver *bridge, u8 *buf,
|
|
unsigned long long addr, u32 aspace, u32 cycle)
|
|
{
|
|
int i;
|
|
unsigned long long start, end, offset;
|
|
u8 *loc;
|
|
|
|
for (i = 0; i < FAKE_MAX_SLAVE; i++) {
|
|
if (aspace != bridge->slaves[i].aspace)
|
|
continue;
|
|
|
|
if (cycle != bridge->slaves[i].cycle)
|
|
continue;
|
|
|
|
start = bridge->slaves[i].vme_base;
|
|
end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
|
|
|
|
if ((addr >= start) && (addr < end)) {
|
|
offset = addr - bridge->slaves[i].vme_base;
|
|
loc = (u8 *)((void *)bridge->slaves[i].buf_base + offset);
|
|
*loc = *buf;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
fake_lm_check(bridge, addr, aspace, cycle);
|
|
|
|
}
|
|
|
|
static void fake_vmewrite16(struct fake_driver *bridge, u16 *buf,
|
|
unsigned long long addr, u32 aspace, u32 cycle)
|
|
{
|
|
int i;
|
|
unsigned long long start, end, offset;
|
|
u16 *loc;
|
|
|
|
for (i = 0; i < FAKE_MAX_SLAVE; i++) {
|
|
if (aspace != bridge->slaves[i].aspace)
|
|
continue;
|
|
|
|
if (cycle != bridge->slaves[i].cycle)
|
|
continue;
|
|
|
|
start = bridge->slaves[i].vme_base;
|
|
end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
|
|
|
|
if ((addr >= start) && ((addr + 1) < end)) {
|
|
offset = addr - bridge->slaves[i].vme_base;
|
|
loc = (u16 *)((void *)bridge->slaves[i].buf_base + offset);
|
|
*loc = *buf;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
fake_lm_check(bridge, addr, aspace, cycle);
|
|
|
|
}
|
|
|
|
static void fake_vmewrite32(struct fake_driver *bridge, u32 *buf,
|
|
unsigned long long addr, u32 aspace, u32 cycle)
|
|
{
|
|
int i;
|
|
unsigned long long start, end, offset;
|
|
u32 *loc;
|
|
|
|
for (i = 0; i < FAKE_MAX_SLAVE; i++) {
|
|
if (aspace != bridge->slaves[i].aspace)
|
|
continue;
|
|
|
|
if (cycle != bridge->slaves[i].cycle)
|
|
continue;
|
|
|
|
start = bridge->slaves[i].vme_base;
|
|
end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
|
|
|
|
if ((addr >= start) && ((addr + 3) < end)) {
|
|
offset = addr - bridge->slaves[i].vme_base;
|
|
loc = (u32 *)((void *)bridge->slaves[i].buf_base + offset);
|
|
*loc = *buf;
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
fake_lm_check(bridge, addr, aspace, cycle);
|
|
|
|
}
|
|
|
|
static ssize_t fake_master_write(struct vme_master_resource *image, void *buf,
|
|
size_t count, loff_t offset)
|
|
{
|
|
int retval = 0;
|
|
u32 aspace, cycle, dwidth;
|
|
unsigned long long addr;
|
|
int i;
|
|
unsigned int done = 0;
|
|
unsigned int count32;
|
|
|
|
struct vme_bridge *fake_bridge;
|
|
struct fake_driver *bridge;
|
|
|
|
fake_bridge = image->parent;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
i = image->number;
|
|
|
|
addr = bridge->masters[i].vme_base + offset;
|
|
aspace = bridge->masters[i].aspace;
|
|
cycle = bridge->masters[i].cycle;
|
|
dwidth = bridge->masters[i].dwidth;
|
|
|
|
spin_lock(&image->lock);
|
|
|
|
/* Here we apply for the same strategy we do in master_read
|
|
* function in order to assure the correct cycles.
|
|
*/
|
|
if (addr & 0x1) {
|
|
fake_vmewrite8(bridge, (u8 *)buf, addr, aspace, cycle);
|
|
done += 1;
|
|
if (done == count)
|
|
goto out;
|
|
}
|
|
|
|
if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
|
|
if ((addr + done) & 0x2) {
|
|
if ((count - done) < 2) {
|
|
fake_vmewrite8(bridge, (u8 *)(buf + done),
|
|
addr + done, aspace, cycle);
|
|
done += 1;
|
|
goto out;
|
|
} else {
|
|
fake_vmewrite16(bridge, (u16 *)(buf + done),
|
|
addr + done, aspace, cycle);
|
|
done += 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (dwidth == VME_D32) {
|
|
count32 = (count - done) & ~0x3;
|
|
while (done < count32) {
|
|
fake_vmewrite32(bridge, (u32 *)(buf + done),
|
|
addr + done, aspace, cycle);
|
|
done += 4;
|
|
}
|
|
} else if (dwidth == VME_D16) {
|
|
count32 = (count - done) & ~0x3;
|
|
while (done < count32) {
|
|
fake_vmewrite16(bridge, (u16 *)(buf + done),
|
|
addr + done, aspace, cycle);
|
|
done += 2;
|
|
}
|
|
} else if (dwidth == VME_D8) {
|
|
count32 = (count - done);
|
|
while (done < count32) {
|
|
fake_vmewrite8(bridge, (u8 *)(buf + done), addr + done,
|
|
aspace, cycle);
|
|
done += 1;
|
|
}
|
|
|
|
}
|
|
|
|
if ((dwidth == VME_D16) || (dwidth == VME_D32)) {
|
|
if ((count - done) & 0x2) {
|
|
fake_vmewrite16(bridge, (u16 *)(buf + done),
|
|
addr + done, aspace, cycle);
|
|
done += 2;
|
|
}
|
|
}
|
|
|
|
if ((count - done) & 0x1) {
|
|
fake_vmewrite8(bridge, (u8 *)(buf + done), addr + done, aspace,
|
|
cycle);
|
|
done += 1;
|
|
}
|
|
|
|
out:
|
|
retval = count;
|
|
|
|
spin_unlock(&image->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
u32 tmp, base;
|
|
u32 aspace, cycle;
|
|
int i;
|
|
struct fake_driver *bridge;
|
|
|
|
bridge = image->parent->driver_priv;
|
|
|
|
/* Find the PCI address that maps to the desired VME address */
|
|
i = image->number;
|
|
|
|
base = bridge->masters[i].vme_base;
|
|
aspace = bridge->masters[i].aspace;
|
|
cycle = bridge->masters[i].cycle;
|
|
|
|
/* Lock image */
|
|
spin_lock(&image->lock);
|
|
|
|
/* Read existing value */
|
|
tmp = fake_vmeread32(bridge, base + offset, aspace, cycle);
|
|
|
|
/* Perform check */
|
|
if ((tmp && mask) == (compare && mask)) {
|
|
tmp = tmp | (mask | swap);
|
|
tmp = tmp & (~mask | swap);
|
|
|
|
/* Write back */
|
|
fake_vmewrite32(bridge, &tmp, base + offset, aspace, cycle);
|
|
}
|
|
|
|
/* Unlock image */
|
|
spin_unlock(&image->lock);
|
|
|
|
return tmp;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
int i;
|
|
struct vme_bridge *fake_bridge;
|
|
struct fake_driver *bridge;
|
|
|
|
fake_bridge = lm->parent;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
mutex_lock(&lm->mtx);
|
|
|
|
/* If we already have a callback attached, we can't move it! */
|
|
for (i = 0; i < lm->monitors; i++) {
|
|
if (bridge->lm_callback[i] != NULL) {
|
|
mutex_unlock(&lm->mtx);
|
|
pr_err("Location monitor callback attached, can't reset\n");
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
switch (aspace) {
|
|
case VME_A16:
|
|
case VME_A24:
|
|
case VME_A32:
|
|
case VME_A64:
|
|
break;
|
|
default:
|
|
mutex_unlock(&lm->mtx);
|
|
pr_err("Invalid address space\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
bridge->lm_base = lm_base;
|
|
bridge->lm_aspace = aspace;
|
|
bridge->lm_cycle = cycle;
|
|
|
|
mutex_unlock(&lm->mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
struct fake_driver *bridge;
|
|
|
|
bridge = lm->parent->driver_priv;
|
|
|
|
mutex_lock(&lm->mtx);
|
|
|
|
*lm_base = bridge->lm_base;
|
|
*aspace = bridge->lm_aspace;
|
|
*cycle = bridge->lm_cycle;
|
|
|
|
mutex_unlock(&lm->mtx);
|
|
|
|
return bridge->lm_enabled;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct vme_bridge *fake_bridge;
|
|
struct fake_driver *bridge;
|
|
|
|
fake_bridge = lm->parent;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
mutex_lock(&lm->mtx);
|
|
|
|
/* Ensure that the location monitor is configured - need PGM or DATA */
|
|
if (bridge->lm_cycle == 0) {
|
|
mutex_unlock(&lm->mtx);
|
|
pr_err("Location monitor not properly configured\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Check that a callback isn't already attached */
|
|
if (bridge->lm_callback[monitor] != NULL) {
|
|
mutex_unlock(&lm->mtx);
|
|
pr_err("Existing callback attached\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* Attach callback */
|
|
bridge->lm_callback[monitor] = callback;
|
|
bridge->lm_data[monitor] = data;
|
|
|
|
/* Ensure that global Location Monitor Enable set */
|
|
bridge->lm_enabled = 1;
|
|
|
|
mutex_unlock(&lm->mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Detach a callback function forn a specific location monitor.
|
|
*/
|
|
static int fake_lm_detach(struct vme_lm_resource *lm, int monitor)
|
|
{
|
|
u32 tmp;
|
|
int i;
|
|
struct fake_driver *bridge;
|
|
|
|
bridge = lm->parent->driver_priv;
|
|
|
|
mutex_lock(&lm->mtx);
|
|
|
|
/* Detach callback */
|
|
bridge->lm_callback[monitor] = NULL;
|
|
bridge->lm_data[monitor] = NULL;
|
|
|
|
/* If all location monitors disabled, disable global Location Monitor */
|
|
tmp = 0;
|
|
for (i = 0; i < lm->monitors; i++) {
|
|
if (bridge->lm_callback[i] != NULL)
|
|
tmp = 1;
|
|
}
|
|
|
|
if (tmp == 0)
|
|
bridge->lm_enabled = 0;
|
|
|
|
mutex_unlock(&lm->mtx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Determine Geographical Addressing
|
|
*/
|
|
static int fake_slot_get(struct vme_bridge *fake_bridge)
|
|
{
|
|
return geoid;
|
|
}
|
|
|
|
static void *fake_alloc_consistent(struct device *parent, size_t size,
|
|
dma_addr_t *dma)
|
|
{
|
|
void *alloc = kmalloc(size, GFP_KERNEL);
|
|
|
|
if (alloc != NULL)
|
|
*dma = fake_ptr_to_pci(alloc);
|
|
|
|
return alloc;
|
|
}
|
|
|
|
static void fake_free_consistent(struct device *parent, size_t size,
|
|
void *vaddr, dma_addr_t dma)
|
|
{
|
|
kfree(vaddr);
|
|
/*
|
|
dma_free_coherent(parent, size, vaddr, 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)
|
|
{
|
|
u32 vstat;
|
|
struct fake_driver *bridge;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
/* Allocate mem for CR/CSR image */
|
|
bridge->crcsr_kernel = kzalloc(VME_CRCSR_BUF_SIZE, GFP_KERNEL);
|
|
bridge->crcsr_bus = fake_ptr_to_pci(bridge->crcsr_kernel);
|
|
if (bridge->crcsr_kernel == NULL)
|
|
return -ENOMEM;
|
|
|
|
vstat = fake_slot_get(fake_bridge);
|
|
|
|
pr_info("CR/CSR Offset: %d\n", vstat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void fake_crcsr_exit(struct vme_bridge *fake_bridge)
|
|
{
|
|
struct fake_driver *bridge;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
kfree(bridge->crcsr_kernel);
|
|
}
|
|
|
|
|
|
static int __init fake_init(void)
|
|
{
|
|
int retval, i;
|
|
struct list_head *pos = NULL, *n;
|
|
struct vme_bridge *fake_bridge;
|
|
struct fake_driver *fake_device;
|
|
struct vme_master_resource *master_image;
|
|
struct vme_slave_resource *slave_image;
|
|
struct vme_lm_resource *lm;
|
|
|
|
/* We need a fake parent device */
|
|
vme_root = __root_device_register("vme", THIS_MODULE);
|
|
|
|
/* If we want to support more than one bridge at some point, we need to
|
|
* dynamically allocate this so we get one per device.
|
|
*/
|
|
fake_bridge = kzalloc(sizeof(struct vme_bridge), GFP_KERNEL);
|
|
if (fake_bridge == NULL) {
|
|
retval = -ENOMEM;
|
|
goto err_struct;
|
|
}
|
|
|
|
fake_device = kzalloc(sizeof(struct fake_driver), GFP_KERNEL);
|
|
if (fake_device == NULL) {
|
|
retval = -ENOMEM;
|
|
goto err_driver;
|
|
}
|
|
|
|
fake_bridge->driver_priv = fake_device;
|
|
|
|
fake_bridge->parent = vme_root;
|
|
|
|
fake_device->parent = fake_bridge;
|
|
|
|
/* Initialize wait queues & mutual exclusion flags */
|
|
mutex_init(&fake_device->vme_int);
|
|
mutex_init(&fake_bridge->irq_mtx);
|
|
tasklet_init(&fake_device->int_tasklet, fake_VIRQ_tasklet,
|
|
(unsigned long) fake_bridge);
|
|
|
|
strcpy(fake_bridge->name, driver_name);
|
|
|
|
/* Add master windows to list */
|
|
INIT_LIST_HEAD(&fake_bridge->master_resources);
|
|
for (i = 0; i < FAKE_MAX_MASTER; i++) {
|
|
master_image = kmalloc(sizeof(struct vme_master_resource),
|
|
GFP_KERNEL);
|
|
if (master_image == NULL) {
|
|
retval = -ENOMEM;
|
|
goto err_master;
|
|
}
|
|
master_image->parent = fake_bridge;
|
|
spin_lock_init(&master_image->lock);
|
|
master_image->locked = 0;
|
|
master_image->number = i;
|
|
master_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
|
|
VME_A64;
|
|
master_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
|
|
VME_2eVME | VME_2eSST | VME_2eSSTB | VME_2eSST160 |
|
|
VME_2eSST267 | VME_2eSST320 | VME_SUPER | VME_USER |
|
|
VME_PROG | VME_DATA;
|
|
master_image->width_attr = VME_D16 | VME_D32;
|
|
memset(&master_image->bus_resource, 0,
|
|
sizeof(struct resource));
|
|
master_image->kern_base = NULL;
|
|
list_add_tail(&master_image->list,
|
|
&fake_bridge->master_resources);
|
|
}
|
|
|
|
/* Add slave windows to list */
|
|
INIT_LIST_HEAD(&fake_bridge->slave_resources);
|
|
for (i = 0; i < FAKE_MAX_SLAVE; i++) {
|
|
slave_image = kmalloc(sizeof(struct vme_slave_resource),
|
|
GFP_KERNEL);
|
|
if (slave_image == NULL) {
|
|
retval = -ENOMEM;
|
|
goto err_slave;
|
|
}
|
|
slave_image->parent = fake_bridge;
|
|
mutex_init(&slave_image->mtx);
|
|
slave_image->locked = 0;
|
|
slave_image->number = i;
|
|
slave_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
|
|
VME_A64 | VME_CRCSR | VME_USER1 | VME_USER2 |
|
|
VME_USER3 | VME_USER4;
|
|
slave_image->cycle_attr = VME_SCT | VME_BLT | VME_MBLT |
|
|
VME_2eVME | VME_2eSST | VME_2eSSTB | VME_2eSST160 |
|
|
VME_2eSST267 | VME_2eSST320 | VME_SUPER | VME_USER |
|
|
VME_PROG | VME_DATA;
|
|
list_add_tail(&slave_image->list,
|
|
&fake_bridge->slave_resources);
|
|
}
|
|
|
|
/* Add location monitor to list */
|
|
INIT_LIST_HEAD(&fake_bridge->lm_resources);
|
|
lm = kmalloc(sizeof(struct vme_lm_resource), GFP_KERNEL);
|
|
if (lm == NULL) {
|
|
pr_err("Failed to allocate memory for location monitor resource structure\n");
|
|
retval = -ENOMEM;
|
|
goto err_lm;
|
|
}
|
|
lm->parent = fake_bridge;
|
|
mutex_init(&lm->mtx);
|
|
lm->locked = 0;
|
|
lm->number = 1;
|
|
lm->monitors = 4;
|
|
list_add_tail(&lm->list, &fake_bridge->lm_resources);
|
|
|
|
fake_bridge->slave_get = fake_slave_get;
|
|
fake_bridge->slave_set = fake_slave_set;
|
|
fake_bridge->master_get = fake_master_get;
|
|
fake_bridge->master_set = fake_master_set;
|
|
fake_bridge->master_read = fake_master_read;
|
|
fake_bridge->master_write = fake_master_write;
|
|
fake_bridge->master_rmw = fake_master_rmw;
|
|
fake_bridge->irq_set = fake_irq_set;
|
|
fake_bridge->irq_generate = fake_irq_generate;
|
|
fake_bridge->lm_set = fake_lm_set;
|
|
fake_bridge->lm_get = fake_lm_get;
|
|
fake_bridge->lm_attach = fake_lm_attach;
|
|
fake_bridge->lm_detach = fake_lm_detach;
|
|
fake_bridge->slot_get = fake_slot_get;
|
|
fake_bridge->alloc_consistent = fake_alloc_consistent;
|
|
fake_bridge->free_consistent = fake_free_consistent;
|
|
|
|
pr_info("Board is%s the VME system controller\n",
|
|
(geoid == 1) ? "" : " not");
|
|
|
|
pr_info("VME geographical address is set to %d\n", geoid);
|
|
|
|
retval = fake_crcsr_init(fake_bridge);
|
|
if (retval) {
|
|
pr_err("CR/CSR configuration failed.\n");
|
|
goto err_crcsr;
|
|
}
|
|
|
|
retval = vme_register_bridge(fake_bridge);
|
|
if (retval != 0) {
|
|
pr_err("Chip Registration failed.\n");
|
|
goto err_reg;
|
|
}
|
|
|
|
exit_pointer = fake_bridge;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
fake_crcsr_exit(fake_bridge);
|
|
err_crcsr:
|
|
err_lm:
|
|
/* resources are stored in link list */
|
|
list_for_each_safe(pos, n, &fake_bridge->lm_resources) {
|
|
lm = list_entry(pos, struct vme_lm_resource, list);
|
|
list_del(pos);
|
|
kfree(lm);
|
|
}
|
|
err_slave:
|
|
/* resources are stored in link list */
|
|
list_for_each_safe(pos, n, &fake_bridge->slave_resources) {
|
|
slave_image = list_entry(pos, struct vme_slave_resource, list);
|
|
list_del(pos);
|
|
kfree(slave_image);
|
|
}
|
|
err_master:
|
|
/* resources are stored in link list */
|
|
list_for_each_safe(pos, n, &fake_bridge->master_resources) {
|
|
master_image = list_entry(pos, struct vme_master_resource,
|
|
list);
|
|
list_del(pos);
|
|
kfree(master_image);
|
|
}
|
|
|
|
kfree(fake_device);
|
|
err_driver:
|
|
kfree(fake_bridge);
|
|
err_struct:
|
|
return retval;
|
|
|
|
}
|
|
|
|
|
|
static void __exit fake_exit(void)
|
|
{
|
|
struct list_head *pos = NULL;
|
|
struct list_head *tmplist;
|
|
struct vme_master_resource *master_image;
|
|
struct vme_slave_resource *slave_image;
|
|
int i;
|
|
struct vme_bridge *fake_bridge;
|
|
struct fake_driver *bridge;
|
|
|
|
fake_bridge = exit_pointer;
|
|
|
|
bridge = fake_bridge->driver_priv;
|
|
|
|
pr_debug("Driver is being unloaded.\n");
|
|
|
|
/*
|
|
* Shutdown all inbound and outbound windows.
|
|
*/
|
|
for (i = 0; i < FAKE_MAX_MASTER; i++)
|
|
bridge->masters[i].enabled = 0;
|
|
|
|
for (i = 0; i < FAKE_MAX_SLAVE; i++)
|
|
bridge->slaves[i].enabled = 0;
|
|
|
|
/*
|
|
* Shutdown Location monitor.
|
|
*/
|
|
bridge->lm_enabled = 0;
|
|
|
|
vme_unregister_bridge(fake_bridge);
|
|
|
|
fake_crcsr_exit(fake_bridge);
|
|
/* resources are stored in link list */
|
|
list_for_each_safe(pos, tmplist, &fake_bridge->slave_resources) {
|
|
slave_image = list_entry(pos, struct vme_slave_resource, list);
|
|
list_del(pos);
|
|
kfree(slave_image);
|
|
}
|
|
|
|
/* resources are stored in link list */
|
|
list_for_each_safe(pos, tmplist, &fake_bridge->master_resources) {
|
|
master_image = list_entry(pos, struct vme_master_resource,
|
|
list);
|
|
list_del(pos);
|
|
kfree(master_image);
|
|
}
|
|
|
|
kfree(fake_bridge->driver_priv);
|
|
|
|
kfree(fake_bridge);
|
|
|
|
root_device_unregister(vme_root);
|
|
}
|
|
|
|
|
|
MODULE_PARM_DESC(geoid, "Set geographical addressing");
|
|
module_param(geoid, int, 0);
|
|
|
|
MODULE_DESCRIPTION("Fake VME bridge driver");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(fake_init);
|
|
module_exit(fake_exit);
|