Commit e6dc49d8 authored by YuriNenakhov's avatar YuriNenakhov

Cache flush on specific adress

parent 753488df
This source diff could not be displayed because it is too large. You can view the blob instead.
......@@ -14,7 +14,6 @@
#define SYSFS_READONLY 0444
#define SYSFS_WRITEONLY 0222
static ssize_t get_paddr(struct device *dev, struct device_attribute *attr, char *buf);
struct elphel_buf_t
......@@ -35,12 +34,10 @@ static int __init elphelmem_init(void)
struct device_node *node;
const __be32 *bufsize_be;
printk("======== Allocating memory buffer ========\n");
node = of_find_node_by_name(NULL, "elphel393-mem");
if (!node)
printk("ERROR: No node found\n");
printk("DMA buffer allocation ERROR: No device tree node found\n");
return -ENODEV;
......@@ -51,7 +48,7 @@ static int __init elphelmem_init(void)
printk("Allocated %u pages at address %x\n", (u32)elphel_buf.size, (u32)elphel_buf.paddr);
printk("Allocated %u pages for DMA at address 0x%x\n", (u32)elphel_buf.size, (u32)elphel_buf.paddr);
else printk("ERROR allocating memory buffer");
......@@ -60,7 +57,7 @@ static int __init elphelmem_init(void)
static void __exit elphelmem_exit(void)
printk("Goodbye Cruel World!\n");
printk("DMA buffer disabled\n");
......@@ -78,13 +75,30 @@ static ssize_t get_size(struct device *dev, struct device_attribute *attr, char
static ssize_t get_cache(struct device *dev, struct device_attribute *attr, char *buf)
return sprintf(buf,"Write in this file to flush L1 and L2 caches.\n");
return sprintf(buf,"Flush L1/L2 caches to memory: write \"MEM_OFFSET NUMBER_OF_PAGES\" of memory region to be flushed into this file or \"1\" to flush all buffer memory.\n");
static ssize_t flush_cache(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
void *startaddr, *endaddr, *bufstart, *bufend;
unsigned long long offset, size;
offset = 0;
size = 0;
sscanf(buf, "%lli %lli", &offset, &size);
bufstart = elphel_buf.paddr;
bufend = bufstart + PAGE_SIZE*elphel_buf.size;
if (size == 0 || offset > elphel_buf.size*PAGE_SIZE || offset+PAGE_SIZE*size > elphel_buf.size*PAGE_SIZE)
startaddr = elphel_buf.vaddr;
endaddr = PAGE_SIZE*elphel_buf.size;
startaddr = elphel_buf.vaddr+offset;
endaddr = startaddr + PAGE_SIZE*size;
return count;
static DEVICE_ATTR(buffer_address, SYSFS_PERMISSIONS & SYSFS_READONLY, get_paddr, NULL);
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment