[PATCH] VME: Adding Fake VME driver
Martyn Welch
martyn at welchs.me.uk
Sat Apr 2 23:15:20 UTC 2016
This patch introduces a fake VME bridge driver. This driver currently
emulates a subset of the VME bridge functionality. This allows some VME
subsystem development and even some VME device driver development to be
carried out in the absence of a proper VME bus.
Signed-off-by: Martyn Welch <martyn at welchs.me.uk>
---
drivers/vme/bridges/Kconfig | 8 +
drivers/vme/bridges/Makefile | 1 +
drivers/vme/bridges/vme_fake.c | 1292 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 1301 insertions(+)
create mode 100644 drivers/vme/bridges/vme_fake.c
diff --git a/drivers/vme/bridges/Kconfig b/drivers/vme/bridges/Kconfig
index f6d8545..f6ddc37 100644
--- a/drivers/vme/bridges/Kconfig
+++ b/drivers/vme/bridges/Kconfig
@@ -13,3 +13,11 @@ config VME_TSI148
help
If you say Y here you get support for the Tundra TSI148 VME bridge
chip.
+
+config VME_FAKE
+ tristate "Fake"
+ help
+ If you say Y here you get support for the fake VME bridge. This
+ provides a virtualised VME Bus for devices with no VME bridge. This
+ is mainly useful for VME development (in the absence of VME
+ hardware).
diff --git a/drivers/vme/bridges/Makefile b/drivers/vme/bridges/Makefile
index 59638af..b074542 100644
--- a/drivers/vme/bridges/Makefile
+++ b/drivers/vme/bridges/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_VME_CA91CX42) += vme_ca91cx42.o
obj-$(CONFIG_VME_TSI148) += vme_tsi148.o
+obj-$(CONFIG_VME_FAKE) += vme_fake.o
diff --git a/drivers/vme/bridges/vme_fake.c b/drivers/vme/bridges/vme_fake.c
new file mode 100644
index 0000000..8789bd6
--- /dev/null
+++ b/drivers/vme/bridges/vme_fake.c
@@ -0,0 +1,1292 @@
+/*
+ * 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 <martyn at welches.me.uk>
+ * Copyright (c) 2014 Martyn Welch
+ *
+ * Based on vme_tsi148.c:
+ *
+ * Author: Martyn Welch <martyn.welch at ge.com>
+ * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
+ *
+ * Based on work by Tom Armistead and Ajit Prem
+ * Copyright 2004 Motorola Inc.
+ *
+ * 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/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 <linux/vme.h>
+
+#include "../vme_bridge.h"
+
+/*
+ * Define the number of each that the fake driver supports.
+ */
+#define FAKE_MAX_MASTER 8 /* Max Master Windows */
+#define FAKE_MAX_SLAVE 8 /* Max Slave Windows */
+
+/* Structures to hold information normally held in device registers */
+struct fake_slave_window {
+ int enabled;
+ unsigned long long vme_base;
+ unsigned long long size;
+ dma_addr_t buf_base;
+ u32 aspace;
+ u32 cycle;
+};
+
+struct fake_master_window {
+ int enabled;
+ unsigned long long vme_base;
+ unsigned long long size;
+ u32 aspace;
+ u32 cycle;
+ u32 dwidth;
+};
+
+/* Structure used to hold driver specific information */
+struct fake_driver {
+ struct vme_bridge *parent;
+ struct fake_slave_window slaves[FAKE_MAX_SLAVE];
+ struct fake_master_window masters[FAKE_MAX_MASTER];
+ u32 lm_enabled;
+ unsigned long long lm_base;
+ u32 lm_aspace;
+ u32 lm_cycle;
+ void (*lm_callback[4])(int);
+ struct tasklet_struct int_tasklet;
+ int int_level;
+ int int_statid;
+ void *crcsr_kernel;
+ dma_addr_t crcsr_bus;
+ /* Only one VME interrupt can be generated at a time, provide locking */
+ struct mutex vme_int;
+};
+
+/* Module parameter */
+static int geoid;
+
+static const char driver_name[] = "vme_fake";
+
+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)
+{
+ struct vme_bridge *fake_bridge;
+ struct fake_driver *bridge;
+
+ fake_bridge = (struct vme_bridge *) data;
+ bridge = fake_bridge->driver_priv;
+
+ vme_irq_handler(fake_bridge, bridge->int_level, bridge->int_statid);
+}
+
+/*
+ * Configure VME interrupt
+ */
+static void fake_irq_set(struct vme_bridge *fake_bridge, int level,
+ int state, int sync)
+{
+ /* Nothing to do */
+}
+
+/*
+ * 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)
+{
+ struct fake_driver *bridge;
+
+ bridge = fake_bridge->driver_priv;
+
+ mutex_lock(&bridge->vme_int);
+
+ bridge->int_level = level;
+
+ bridge->int_statid = statid;
+
+ /*
+ * Schedule tasklet to run VME handler to emulate normal VME interrupt
+ * handler behaviour.
+ */
+ tasklet_schedule(&bridge->int_tasklet);
+
+ mutex_unlock(&bridge->vme_int);
+
+ return 0;
+}
+
+/*
+ * 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)
+{
+ unsigned int i, granularity = 0;
+ unsigned long long vme_bound;
+ struct vme_bridge *fake_bridge;
+ struct fake_driver *bridge;
+
+ fake_bridge = image->parent;
+ bridge = fake_bridge->driver_priv;
+
+ i = image->number;
+
+ switch (aspace) {
+ case VME_A16:
+ granularity = 0x10;
+ break;
+ case VME_A24:
+ granularity = 0x1000;
+ break;
+ case VME_A32:
+ granularity = 0x10000;
+ break;
+ case VME_A64:
+ granularity = 0x10000;
+ break;
+ case VME_CRCSR:
+ case VME_USER1:
+ case VME_USER2:
+ case VME_USER3:
+ case VME_USER4:
+ default:
+ pr_err("Invalid address space\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Bound address is a valid address for the window, adjust
+ * accordingly
+ */
+ vme_bound = vme_base + size - granularity;
+
+ if (vme_base & (granularity - 1)) {
+ pr_err("Invalid VME base alignment\n");
+ return -EINVAL;
+ }
+ if (vme_bound & (granularity - 1)) {
+ pr_err("Invalid VME bound alignment\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&image->mtx);
+
+ bridge->slaves[i].enabled = enabled;
+ bridge->slaves[i].vme_base = vme_base;
+ bridge->slaves[i].size = size;
+ bridge->slaves[i].buf_base = buf_base;
+ bridge->slaves[i].aspace = aspace;
+ bridge->slaves[i].cycle = cycle;
+
+ mutex_unlock(&image->mtx);
+
+ return 0;
+}
+
+/*
+ * 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)
+{
+ unsigned int i;
+ struct fake_driver *bridge;
+
+ bridge = image->parent->driver_priv;
+
+ i = image->number;
+
+ mutex_lock(&image->mtx);
+
+ *enabled = bridge->slaves[i].enabled;
+ *vme_base = bridge->slaves[i].vme_base;
+ *size = bridge->slaves[i].size;
+ *buf_base = bridge->slaves[i].buf_base;
+ *aspace = bridge->slaves[i].aspace;
+ *cycle = bridge->slaves[i].cycle;
+
+ mutex_unlock(&image->mtx);
+
+ return 0;
+}
+
+/*
+ * 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)
+{
+ int retval = 0;
+ unsigned int i;
+ struct vme_bridge *fake_bridge;
+ struct fake_driver *bridge;
+
+ fake_bridge = image->parent;
+
+ bridge = fake_bridge->driver_priv;
+
+ /* Verify input data */
+ if (vme_base & 0xFFFF) {
+ pr_err("Invalid VME Window alignment\n");
+ retval = -EINVAL;
+ goto err_window;
+ }
+
+ if (size & 0xFFFF) {
+ spin_unlock(&image->lock);
+ pr_err("Invalid size alignment\n");
+ retval = -EINVAL;
+ goto err_window;
+ }
+
+ if ((size == 0) && (enabled != 0)) {
+ pr_err("Size must be non-zero for enabled windows\n");
+ retval = -EINVAL;
+ goto err_window;
+ }
+
+ /* Setup data width */
+ switch (dwidth) {
+ case VME_D8:
+ case VME_D16:
+ case VME_D32:
+ break;
+ default:
+ spin_unlock(&image->lock);
+ pr_err("Invalid data width\n");
+ retval = -EINVAL;
+ goto err_dwidth;
+ }
+
+ /* Setup address space */
+ switch (aspace) {
+ case VME_A16:
+ case VME_A24:
+ case VME_A32:
+ case VME_A64:
+ case VME_CRCSR:
+ case VME_USER1:
+ case VME_USER2:
+ case VME_USER3:
+ case VME_USER4:
+ break;
+ default:
+ spin_unlock(&image->lock);
+ pr_err("Invalid address space\n");
+ retval = -EINVAL;
+ goto err_aspace;
+ }
+
+ spin_lock(&image->lock);
+
+ i = image->number;
+
+ bridge->masters[i].enabled = enabled;
+ bridge->masters[i].vme_base = vme_base;
+ bridge->masters[i].size = size;
+ bridge->masters[i].aspace = aspace;
+ bridge->masters[i].cycle = cycle;
+ bridge->masters[i].dwidth = dwidth;
+
+ spin_unlock(&image->lock);
+
+ return 0;
+
+err_aspace:
+err_dwidth:
+err_window:
+ return retval;
+
+}
+
+/*
+ * 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)
+{
+ unsigned int i;
+ struct fake_driver *bridge;
+
+ bridge = image->parent->driver_priv;
+
+ i = image->number;
+
+ *enabled = bridge->masters[i].enabled;
+ *vme_base = bridge->masters[i].vme_base;
+ *size = bridge->masters[i].size;
+ *aspace = bridge->masters[i].aspace;
+ *cycle = bridge->masters[i].cycle;
+ *dwidth = bridge->masters[i].dwidth;
+
+ return 0;
+}
+
+
+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)
+{
+ int retval;
+
+ spin_lock(&image->lock);
+
+ retval = __fake_master_get(image, enabled, vme_base, size, aspace,
+ cycle, dwidth);
+
+ spin_unlock(&image->lock);
+
+ return retval;
+}
+
+
+void fake_lm_check(struct fake_driver *bridge, unsigned long long addr,
+ u32 aspace, u32 cycle)
+{
+ struct vme_bridge *fake_bridge;
+ unsigned long long lm_base;
+ u32 lm_aspace, lm_cycle;
+ int i;
+ struct vme_lm_resource *lm;
+ struct list_head *pos = NULL, *n;
+
+ /* Get vme_bridge */
+ fake_bridge = bridge->parent;
+
+ /* Loop through each location monitor resource */
+ list_for_each_safe(pos, n, &fake_bridge->lm_resources) {
+ lm = list_entry(pos, struct vme_lm_resource, list);
+
+ /* If disabled, we're done */
+ if (bridge->lm_enabled == 0)
+ return;
+
+ lm_base = bridge->lm_base;
+ lm_aspace = bridge->lm_aspace;
+ lm_cycle = bridge->lm_cycle;
+
+ /* First make sure that the cycle and address space match */
+ if ((lm_aspace == aspace) && (lm_cycle == (cycle & 0xf000))) {
+ for (i = 0; i < lm->monitors; i++) {
+ /* Each location monitor covers 8 bytes */
+ if (((lm_base + (8 * i)) <= addr) &&
+ ((lm_base + (8 * i) + 8) > addr)) {
+ if (bridge->lm_callback[i] != NULL)
+ bridge->lm_callback[i](i);
+ }
+ }
+ }
+ }
+}
+
+static u8 fake_vmeread8(struct fake_driver *bridge, unsigned long long addr,
+ u32 aspace, u32 cycle)
+{
+ u8 retval = 0xff;
+ int i;
+ unsigned long long start, end, offset;
+ u8 *loc;
+
+ for (i = 0; i < FAKE_MAX_SLAVE; i++) {
+ start = bridge->slaves[i].vme_base;
+ end = bridge->slaves[i].vme_base + bridge->slaves[i].size;
+
+ if (aspace != bridge->slaves[i].aspace)
+ continue;
+
+ if (cycle != bridge->slaves[i].cycle)
+ continue;
+
+ if ((addr >= start) && (addr < end)) {
+ offset = addr - bridge->slaves[i].vme_base;
+ loc = (u8 *)(bridge->slaves[i].buf_base + offset);
+ retval = *loc;
+
+ break;
+ }
+ }
+
+ fake_lm_check(bridge, addr, aspace, cycle);
+
+ return retval;
+}
+
+static u16 fake_vmeread16(struct fake_driver *bridge, unsigned long long addr,
+ u32 aspace, u32 cycle)
+{
+ u16 retval = 0xffff;
+ 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 *)(bridge->slaves[i].buf_base + offset);
+ retval = *loc;
+
+ break;
+ }
+ }
+
+ fake_lm_check(bridge, addr, aspace, cycle);
+
+ return retval;
+}
+
+static u32 fake_vmeread32(struct fake_driver *bridge, unsigned long long addr,
+ u32 aspace, u32 cycle)
+{
+ u32 retval = 0xffffffff;
+ 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 *)(bridge->slaves[i].buf_base + offset);
+ retval = *loc;
+
+ break;
+ }
+ }
+
+ fake_lm_check(bridge, addr, aspace, cycle);
+
+ return retval;
+}
+
+static ssize_t fake_master_read(struct vme_master_resource *image, void *buf,
+ size_t count, loff_t offset)
+{
+ int retval;
+ u32 aspace, cycle, dwidth;
+ struct vme_bridge *fake_bridge;
+ struct fake_driver *priv;
+ int i;
+ unsigned long long addr;
+ unsigned int done = 0;
+ unsigned int count32;
+
+ fake_bridge = image->parent;
+
+ priv = fake_bridge->driver_priv;
+
+ i = image->number;
+
+ addr = (unsigned long long)priv->masters[i].vme_base + offset;
+ aspace = priv->masters[i].aspace;
+ cycle = priv->masters[i].cycle;
+ dwidth = priv->masters[i].dwidth;
+
+ spin_lock(&image->lock);
+
+ /* The following code handles VME address alignment. We cannot use
+ * memcpy_xxx here because it may cut data transfers in to 8-bit
+ * cycles when D16 or D32 cycles are required on the VME bus.
+ * On the other hand, the bridge itself assures that the maximum data
+ * cycle configured for the transfer is used and splits it
+ * automatically for non-aligned addresses, so we don't want the
+ * overhead of needlessly forcing small transfers for the entire cycle.
+ */
+ if (addr & 0x1) {
+ *(u8 *)buf = fake_vmeread8(priv, 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) {
+ *(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;
+}
+
+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 *)(bridge->slaves[i].buf_base + offset);
+ *loc = *buf;
+
+ break;
+ }
+ }
+
+ fake_lm_check(bridge, addr, aspace, cycle);
+
+}
+
+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 *)(bridge->slaves[i].buf_base + offset);
+ *loc = *buf;
+
+ break;
+ }
+ }
+
+ fake_lm_check(bridge, addr, aspace, cycle);
+
+}
+
+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 *)(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)(int))
+{
+ 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;
+
+ /* 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;
+
+ /* 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 *address;
+
+ address = kzalloc(size, GFP_KERNEL);
+ *dma = (dma_addr_t)address;
+
+ return address;
+}
+
+static void fake_free_consistent(struct device *parent, size_t size,
+ void *vaddr, dma_addr_t dma)
+{
+ kfree(vaddr);
+}
+
+/*
+ * 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 = (dma_addr_t)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);
--
2.1.4
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