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authorTom Rini <trini@konsulko.com>2017-12-19 15:07:39 -0500
committerTom Rini <trini@konsulko.com>2017-12-19 15:07:39 -0500
commit9ae3b81724f87dcc1f5cbd618c472e0cf79b2791 (patch)
treed3d1e6ac479ba64a78dcf16e521898a44ed08878 /meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c
parent592c4aca65cc41ea9e5757084ae1d488d2bbd8b0 (diff)
parenteb675727a6bfdee2ba7dd36644403163f9d905e2 (diff)
Merge branch 'pyro' into eel
Diffstat (limited to 'meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c')
-rw-r--r--meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c457
1 files changed, 457 insertions, 0 deletions
diff --git a/meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c b/meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c
new file mode 100644
index 0000000..a5d4363
--- /dev/null
+++ b/meta-rcar-gen3-adas/recipes-kernel/kernel-module-cmemdrv/files/cmemdrv.c
@@ -0,0 +1,457 @@
+/*************************************************************************/ /*
+ Memory Driver (kernel module)
+
+ Copyright (C) 2015 - 2017 Renesas Electronics Corporation
+
+ License Dual MIT/GPLv2
+
+ The contents of this file are subject to the MIT license as set out below.
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation files (the "Software"), to deal
+ in the Software without restriction, including without limitation the rights
+ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the Software is
+ furnished to do so, subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+ Alternatively, the contents of this file may be used under the terms of
+ the GNU General Public License Version 2 ("GPL") in which case the provisions
+ of GPL are applicable instead of those above.
+
+ If you wish to allow use of your version of this file only under the terms of
+ GPL, and not to allow others to use your version of this file under the terms
+ of the MIT license, indicate your decision by deleting the provisions above
+ and replace them with the notice and other provisions required by GPL as set
+ out in the file called "GPL-COPYING" included in this distribution. If you do
+ not delete the provisions above, a recipient may use your version of this file
+ under the terms of either the MIT license or GPL.
+
+ This License is also included in this distribution in the file called
+ "MIT-COPYING".
+
+ EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
+ PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ PURPOSE AND NONINFRINGEMENT; AND (B) IN NO EVENT SHALL THE AUTHORS OR
+ COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+ GPLv2:
+ If you wish to use this file under the terms of GPL, following terms are
+ effective.
+
+ 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; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/ /*************************************************************************/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <asm/uaccess.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/of_device.h>
+
+#define MAX_AREA_NUM 4
+#define DEFAULT_AREA_SIZE (16 * 1024 * 1024)
+
+#define PARAM_SET 1
+#define M_LOCK 3
+#define M_UNLOCK 4
+#define GET_PHYS_ADDR 5
+#define M_ALLOCATE 6
+#define M_UNALLOCATE 7
+#define TRY_CONV 8
+
+#define IOCTL_FROM_IMP_TO_CPU 0
+#define IOCTL_FROM_CPU_TO_IMP 1
+
+struct mem_area_data {
+ struct device *dev;
+ size_t size;
+ void *virt_ptr;
+ dma_addr_t phys_addr;
+};
+
+struct mem_access_data {
+ struct mem_area_data* area;
+ int start_offset;
+ int offset;
+ int width;
+ int height;
+ int stride;
+ int locked;
+ int tl;
+};
+
+static unsigned int bsize_count;
+static unsigned long bsize[MAX_AREA_NUM];
+module_param_array(bsize, ulong, &bsize_count, S_IRUGO);
+static int cached = 1;
+module_param(cached, int, S_IRUGO);
+
+#ifdef CFG_USE_FPGA
+static unsigned long cfg_bsize = 0;
+module_param(cfg_bsize, ulong, S_IRUGO);
+#endif
+
+static unsigned int cmem_major = 88; // 0:auto
+module_param(cmem_major, uint, S_IRUGO);
+
+static struct class *cmem_class = NULL;
+static struct mem_area_data *cmem_areas[MAX_AREA_NUM];
+
+static int cv_v_to_p(unsigned long vaddr, unsigned long *paddr)
+{
+ struct vm_area_struct *vma;
+ unsigned long start, offset;
+ unsigned long pfn;
+ int ret;
+
+ *paddr = 0;
+
+ vma = find_vma(current->active_mm, vaddr);
+ if (vma == NULL)
+ return -EINVAL;
+
+ start = vaddr & PAGE_MASK;
+ ret = follow_pfn(vma, start, &pfn);
+ if (ret < 0)
+ return ret;
+
+ offset = offset_in_page(vaddr);
+ *paddr = (pfn << PAGE_SHIFT) + offset;
+
+ return 0;
+}
+
+static void do_tl(u64 *src, u64 *dst, unsigned int height, unsigned int step)
+{
+ unsigned int i;
+ int j;
+ unsigned int yaddr;
+ u64 *isrc, *idst, *isrcp, *idstp;
+
+ for (j = 0; j < height ; j += 2) {
+ yaddr = (j & ~0x1f) * step | ((j & 0x1f) << 7);
+ isrc = src + (yaddr >> 3);
+ idst = dst + (j * step >> 3);
+ for (i = 0; i < step >> 3; i += 16) {
+ idstp = idst + i;
+ isrcp = isrc + (i << 5);
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ idstp = idst + i + (step >> 3);
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+ *idstp++ = *isrcp++;
+
+ //idst[i] = isrc[((i >> 4) << 9) + (i & 0xf)];
+ }
+ }
+}
+
+static ssize_t dev_read(struct file *filep, char *buf, size_t len, loff_t *ppos)
+{
+ size_t count;
+ struct mem_access_data *p = filep->private_data;
+
+ if (p->tl) {
+ do_tl( (u64 *)(p->area->virt_ptr + p->offset + p->start_offset),
+ (u64 *)buf, p->height, p->stride );
+ count = len;
+ } else {
+ count = copy_to_user(buf, p->area->virt_ptr + p->offset + p->start_offset, len);
+ }
+
+ return count;
+}
+
+static ssize_t dev_write(struct file *filep, const char *buf, size_t len, loff_t *ppos)
+{
+ size_t count;
+ struct mem_access_data *p = filep->private_data;
+
+ count = copy_from_user(p->area->virt_ptr + p->offset + p->start_offset, buf, len);
+
+ return count;
+}
+
+static long dev_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
+{
+ struct mem_access_data *p = filep->private_data;
+ struct device *dev = p->area->dev;
+ u32 offset, size, dir;
+
+ switch (cmd) {
+ case PARAM_SET :
+ p->width = ((unsigned int *)arg)[0];
+ p->height = ((unsigned int *)arg)[1];
+ p->stride = ((unsigned int *)arg)[2];
+ p->tl = ((unsigned int *)arg)[3];
+ p->offset = ((unsigned int *)arg)[4];
+ break;
+ case M_ALLOCATE :
+ break;
+ case M_LOCK :
+ if (cached) {
+ offset = ((unsigned int *)arg)[0];
+ size = ((unsigned int *)arg)[1];
+ dir = ((unsigned int *)arg)[2];
+ if (dir == IOCTL_FROM_IMP_TO_CPU)
+ dma_sync_single_for_device(dev, p->area->phys_addr + p->start_offset + offset, size, DMA_FROM_DEVICE);
+ else
+ dma_sync_single_for_device(dev, p->area->phys_addr + p->start_offset + offset, size, DMA_TO_DEVICE);
+ }
+ break;
+ case M_UNLOCK :
+ if (cached) {
+ offset = ((unsigned int *)arg)[0];
+ size = ((unsigned int *)arg)[1];
+ dir = ((unsigned int *)arg)[2];
+ if (dir == IOCTL_FROM_IMP_TO_CPU)
+ dma_sync_single_for_cpu(dev, p->area->phys_addr + p->start_offset + offset, size, DMA_FROM_DEVICE);
+ else
+ dma_sync_single_for_cpu(dev, p->area->phys_addr + p->start_offset + offset, size, DMA_TO_DEVICE);
+ }
+ break;
+ case M_UNALLOCATE :
+ break;
+ case GET_PHYS_ADDR :
+ *((unsigned int *)arg) = p->area->phys_addr;
+ break;
+ case TRY_CONV :
+ cv_v_to_p( ( (unsigned long *)arg )[0], (unsigned long *)arg + 1);
+ break;
+ default:
+ dev_warn(dev, "## unknown ioctl command %d\n", cmd);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int dev_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+ struct mem_access_data *p = filep->private_data;
+ unsigned long off;
+ unsigned long start;
+
+ if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+ return -EINVAL;
+
+ off = vma->vm_pgoff << PAGE_SHIFT;
+ start = p->area->phys_addr;
+
+ if ((vma->vm_end - vma->vm_start + off) > p->area->size)
+ return -EINVAL;
+
+ off += start;
+ vma->vm_pgoff = off >> PAGE_SHIFT;
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ if (!cached)
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ return remap_pfn_range( vma,
+ vma->vm_start,
+ vma->vm_pgoff,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot ) ;
+}
+
+static int dev_open(struct inode *inode, struct file *filep)
+{
+ struct mem_access_data *mem_access_p;
+ int minor = iminor(inode);
+ struct mem_area_data* area = cmem_areas[minor];
+
+ mem_access_p = kzalloc(sizeof(*mem_access_p), GFP_KERNEL);
+ if (!mem_access_p)
+ return -ENOMEM;
+
+ dev_dbg(area->dev, "Device Open\n");
+ mem_access_p->area = area;
+ filep->private_data = mem_access_p;
+
+ return 0;
+}
+
+static int dev_rls(struct inode *inode, struct file *filep)
+{
+ struct mem_access_data *mem_access_p = filep->private_data;
+ kfree(mem_access_p);
+ return 0;
+}
+
+static struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .read = dev_read,
+ .write = dev_write,
+ .unlocked_ioctl = dev_ioctl,
+ .compat_ioctl = dev_ioctl,
+ .mmap = dev_mmap,
+ .open = dev_open,
+ .release = dev_rls,
+};
+
+static int cmemdrv_create_device(dev_t devt, size_t size)
+{
+ int ret;
+ struct mem_area_data *area;
+ struct device *dev;
+ void *virt_b_ptr;
+ dma_addr_t phy_b_addr;
+
+ dev = device_create(cmem_class, NULL, devt, NULL, "cmem%d", MINOR(devt));
+ if (IS_ERR(dev)) {
+ pr_err("cmem: unable to create device cmem%d\n", MINOR(devt));
+ return PTR_ERR(dev);
+ }
+
+ area = devm_kzalloc(dev, sizeof(*area), GFP_KERNEL);
+ if (!area) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ area->dev = dev;
+
+#ifdef CONFIG_ARM64
+ {
+ struct device_node *np;
+ np = of_find_compatible_node(NULL, NULL, "shared-dma-pool");
+ of_dma_configure(dev, np);
+ }
+#endif
+
+ virt_b_ptr = dmam_alloc_coherent(dev, size + PAGE_SIZE, &phy_b_addr, GFP_KERNEL);
+ if (!virt_b_ptr) {
+ dev_err(dev, "Memory allocation failed.. (size:0x%zx)\n", size);
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ area->virt_ptr = PTR_ALIGN(virt_b_ptr, PAGE_SIZE);
+ area->phys_addr = phy_b_addr + (area->virt_ptr - virt_b_ptr);
+ area->size = size;
+ cmem_areas[MINOR(devt)] = area;
+ dev_notice(dev, "Memory allocated.. 0x%08lx (size:0x%zx)\n", (unsigned long)area->phys_addr, size);
+
+ return 0;
+
+err:
+ device_destroy(cmem_class, devt);
+ return ret;
+}
+
+static int __init cmemdrv_init(void)
+{
+ int i = 0;
+ int ret;
+
+ if (bsize_count == 0)
+ bsize[bsize_count++] = DEFAULT_AREA_SIZE; /* add default area */
+
+#ifdef CFG_USE_FPGA
+ if (cfg_bsize && bsize_count < MAX_AREA_NUM)
+ bsize[bsize_count++] = cfg_bsize; /* for compatibility */
+#endif
+
+ ret = register_chrdev(cmem_major, "CMem", &fops);
+ if (ret < 0) {
+ pr_err("cmem: unable to get major %d\n", cmem_major);
+ return ret;
+ }
+ if (cmem_major == 0)
+ cmem_major = ret;
+
+ cmem_class = class_create(THIS_MODULE, "cmem");
+ if (IS_ERR(cmem_class)) {
+ pr_err("cmem: unable to create class\n");
+ ret = PTR_ERR(cmem_class);
+ goto err1;
+ }
+
+ for (i = 0; i < bsize_count; i++) {
+ ret = cmemdrv_create_device(MKDEV(cmem_major, i), bsize[i]);
+ if (ret < 0)
+ goto err2;
+ }
+
+ return 0;
+
+err2:
+ for (i--; i >= 0; i--)
+ device_destroy(cmem_class, MKDEV(cmem_major, i));
+
+ class_destroy(cmem_class);
+err1:
+ unregister_chrdev(cmem_major, "CMem");
+ return ret;
+}
+
+static void __exit cmemdrv_exit(void)
+{
+ int i;
+ for (i = 0; i < bsize_count; i++)
+ device_destroy(cmem_class, MKDEV(cmem_major, i));
+
+ class_destroy(cmem_class);
+ unregister_chrdev(cmem_major, "CMem");
+}
+
+module_init(cmemdrv_init)
+module_exit(cmemdrv_exit)
+
+MODULE_AUTHOR("RenesasElectronicsCorp.");
+MODULE_DESCRIPTION("Userspace I/O driver for image memory");
+MODULE_LICENSE("GPL v2");