openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

Staging: vme: Allow size of 0 when disabling a window 

The TSI148 driver currently does not allow a size of zero to be passed to a
window. Zero is a valid value if the window is being disabled. Allow
windows to be disabled and their registers cleared.

Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Martyn Welch 2009-10-29 16:35:01 +00:00 committed by Greg Kroah-Hartman
parent 70d7aa889f
commit 59c2290428
1 changed files with 34 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/staging/vme/bridges/vme_tsi148.c
View File

@ -846,7 +846,7 @@ static int tsi148_alloc_resource(struct vme_master_resource *image,
image->pci_resource.start);
/* If the existing size is OK, return */
if (existing_size == (size - 1))
if ((size != 0) && (existing_size == (size - 1)))
return 0;
if (existing_size != 0) {
@ -858,6 +858,11 @@ static int tsi148_alloc_resource(struct vme_master_resource *image,
memset(&(image->pci_resource), 0, sizeof(struct resource));
}
/* Exit here if size is zero */
if (size == 0) {
return 0;
}
if (image->pci_resource.name == NULL) {
image->pci_resource.name = kmalloc(VMENAMSIZ+3, GFP_KERNEL);
if (image->pci_resource.name == NULL) {
@ -936,12 +941,13 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
/* Verify input data */
if (vme_base & 0xFFFF) {
printk("Invalid VME Window alignment\n");
printk(KERN_ERR "Invalid VME Window alignment\n");
retval = -EINVAL;
goto err_window;
}
if (size < 0x10000) {
printk("Invalid VME Window size\n");
if ((size == 0) && (enabled != 0)) {
printk(KERN_ERR "Size must be non-zero for enabled windows\n");
retval = -EINVAL;
goto err_window;
}
@ -949,26 +955,31 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
spin_lock(&(image->lock));
/* Let's allocate the resource here rather than further up the stack as
* it avoids pushing loads of bus dependant stuff up the stack
* it avoids pushing loads of bus dependant stuff up the stack. If size
* is zero, any existing resource will be freed.
*/
retval = tsi148_alloc_resource(image, size);
if (retval) {
spin_unlock(&(image->lock));
printk(KERN_ERR "Unable to allocate memory for resource "
"name\n");
retval = -ENOMEM;
printk(KERN_ERR "Unable to allocate memory for "
"resource\n");
goto err_res;
}
pci_base = (unsigned long long)image->pci_resource.start;
if (size == 0) {
pci_base = 0;
pci_bound = 0;
vme_offset = 0;
} else {
pci_base = (unsigned long long)image->pci_resource.start;
/*
* Bound address is a valid address for the window, adjust
* according to window granularity.
*/
pci_bound = pci_base + (size - 0x10000);
vme_offset = vme_base - pci_base;
/*
* Bound address is a valid address for the window, adjust
* according to window granularity.
*/
pci_bound = pci_base + (size - 0x10000);
vme_offset = vme_base - pci_base;
}
/* Convert 64-bit variables to 2x 32-bit variables */
reg_split(pci_base, &pci_base_high, &pci_base_low);
@ -977,19 +988,19 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
if (pci_base_low & 0xFFFF) {
spin_unlock(&(image->lock));
printk("Invalid PCI base alignment\n");
printk(KERN_ERR "Invalid PCI base alignment\n");
retval = -EINVAL;
goto err_gran;
}
if (pci_bound_low & 0xFFFF) {
spin_unlock(&(image->lock));
printk("Invalid PCI bound alignment\n");
printk(KERN_ERR "Invalid PCI bound alignment\n");
retval = -EINVAL;
goto err_gran;
}
if (vme_offset_low & 0xFFFF) {
spin_unlock(&(image->lock));
printk("Invalid VME Offset alignment\n");
printk(KERN_ERR "Invalid VME Offset alignment\n");
retval = -EINVAL;
goto err_gran;
}
@ -1049,7 +1060,8 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
temp_ctl |= TSI148_LCSR_OTAT_TM_2eSST;
}
if (cycle & VME_2eSSTB) {
printk("Currently not setting Broadcast Select Registers\n");
printk(KERN_WARNING "Currently not setting Broadcast Select "
"Registers\n");
temp_ctl &= ~TSI148_LCSR_OTAT_TM_M;
temp_ctl |= TSI148_LCSR_OTAT_TM_2eSSTB;
}
@ -1065,7 +1077,7 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
break;
default:
spin_unlock(&(image->lock));
printk("Invalid data width\n");
printk(KERN_ERR "Invalid data width\n");
retval = -EINVAL;
goto err_dwidth;
}
@ -1102,7 +1114,7 @@ int tsi148_master_set( struct vme_master_resource *image, int enabled,
break;
default:
spin_unlock(&(image->lock));
printk("Invalid address space\n");
printk(KERN_ERR "Invalid address space\n");
retval = -EINVAL;
goto err_aspace;
break;