diff options
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.c | 457 |
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"); |