blob: 5fd9e46a5f95cc06d3eb11c5c8b0187b008befd8 [file] [log] [blame]
/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*/
/* #define DEBUG */
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/memory_alloc.h>
#include <mach/rpm-smd.h>
#include "msm-buspm-dev.h"
#define MSM_BUSPM_DRV_NAME "msm-buspm-dev"
enum msm_buspm_spdm_res {
SPDM_RES_ID = 0,
SPDM_RES_TYPE = 0x63707362,
SPDM_KEY = 0x00006e65,
SPDM_SIZE = 4,
};
/*
* Allocate kernel buffer.
* Currently limited to one buffer per file descriptor. If alloc() is
* called twice for the same descriptor, the original buffer is freed.
* There is also no locking protection so the same descriptor can not be shared.
*/
static inline void *msm_buspm_dev_get_vaddr(struct file *filp)
{
struct msm_buspm_map_dev *dev = filp->private_data;
return (dev) ? dev->vaddr : NULL;
}
static inline unsigned int msm_buspm_dev_get_buflen(struct file *filp)
{
struct msm_buspm_map_dev *dev = filp->private_data;
return dev ? dev->buflen : 0;
}
static inline unsigned long msm_buspm_dev_get_paddr(struct file *filp)
{
struct msm_buspm_map_dev *dev = filp->private_data;
return (dev) ? dev->paddr : 0L;
}
static void msm_buspm_dev_free(struct file *filp)
{
struct msm_buspm_map_dev *dev = filp->private_data;
if (dev) {
pr_debug("freeing memory at 0x%p\n", dev->vaddr);
free_contiguous_memory(dev->vaddr);
dev->paddr = 0L;
dev->vaddr = NULL;
}
}
static int msm_buspm_dev_open(struct inode *inode, struct file *filp)
{
struct msm_buspm_map_dev *dev;
if (capable(CAP_SYS_ADMIN)) {
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev)
filp->private_data = dev;
else
return -ENOMEM;
} else {
return -EPERM;
}
return 0;
}
static int
msm_buspm_dev_alloc(struct file *filp, struct buspm_alloc_params data)
{
unsigned long paddr;
void *vaddr;
struct msm_buspm_map_dev *dev = filp->private_data;
/* If buffer already allocated, then free it */
if (dev->vaddr)
msm_buspm_dev_free(filp);
/* Allocate uncached memory */
vaddr = allocate_contiguous_ebi(data.size, PAGE_SIZE, 0);
paddr = (vaddr) ? memory_pool_node_paddr(vaddr) : 0L;
if (vaddr == NULL) {
pr_err("allocation of 0x%x bytes failed", data.size);
return -ENOMEM;
}
dev->vaddr = vaddr;
dev->paddr = paddr;
dev->buflen = data.size;
filp->f_pos = 0;
pr_debug("virt addr = 0x%p\n", dev->vaddr);
pr_debug("phys addr = 0x%lx\n", dev->paddr);
return 0;
}
static int msm_bus_rpm_req(u32 rsc_type, u32 key, u32 hwid,
int ctx, u32 val)
{
struct msm_rpm_request *rpm_req;
int ret, msg_id;
rpm_req = msm_rpm_create_request(ctx, rsc_type, SPDM_RES_ID, 1);
if (rpm_req == NULL) {
pr_err("RPM: Couldn't create RPM Request\n");
return -ENXIO;
}
ret = msm_rpm_add_kvp_data(rpm_req, key, (const uint8_t *)&val,
(int)(sizeof(uint32_t)));
if (ret) {
pr_err("RPM: Add KVP failed for RPM Req:%u\n",
rsc_type);
goto err;
}
pr_debug("Added Key: %d, Val: %u, size: %d\n", key,
(uint32_t)val, sizeof(uint32_t));
msg_id = msm_rpm_send_request(rpm_req);
if (!msg_id) {
pr_err("RPM: No message ID for req\n");
ret = -ENXIO;
goto err;
}
ret = msm_rpm_wait_for_ack(msg_id);
if (ret) {
pr_err("RPM: Ack failed\n");
goto err;
}
err:
msm_rpm_free_request(rpm_req);
return ret;
}
static int msm_buspm_ioc_cmds(uint32_t arg)
{
switch (arg) {
case MSM_BUSPM_SPDM_CLK_DIS:
case MSM_BUSPM_SPDM_CLK_EN:
return msm_bus_rpm_req(SPDM_RES_TYPE, SPDM_KEY, 0,
MSM_RPM_CTX_ACTIVE_SET, arg);
default:
pr_warn("Unsupported ioctl command: %d\n", arg);
return -EINVAL;
}
}
static long
msm_buspm_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct buspm_xfer_req xfer;
struct buspm_alloc_params alloc_data;
unsigned long paddr;
int retval = 0;
void *buf = msm_buspm_dev_get_vaddr(filp);
unsigned int buflen = msm_buspm_dev_get_buflen(filp);
unsigned char *dbgbuf = buf;
if (_IOC_TYPE(cmd) != MSM_BUSPM_IOC_MAGIC) {
pr_err("Wrong IOC_MAGIC.Exiting\n");
return -ENOTTY;
}
switch (cmd) {
case MSM_BUSPM_IOC_FREE:
pr_debug("cmd = 0x%x (FREE)\n", cmd);
msm_buspm_dev_free(filp);
break;
case MSM_BUSPM_IOC_ALLOC:
pr_debug("cmd = 0x%x (ALLOC)\n", cmd);
retval = __get_user(alloc_data.size, (size_t __user *)arg);
if (retval == 0)
retval = msm_buspm_dev_alloc(filp, alloc_data);
break;
case MSM_BUSPM_IOC_RD_PHYS_ADDR:
pr_debug("Read Physical Address\n");
paddr = msm_buspm_dev_get_paddr(filp);
if (paddr == 0L) {
retval = -EINVAL;
} else {
pr_debug("phys addr = 0x%lx\n", paddr);
retval = __put_user(paddr,
(unsigned long __user *)arg);
}
break;
case MSM_BUSPM_IOC_RDBUF:
pr_debug("Read Buffer: 0x%x%x%x%x\n",
dbgbuf[0], dbgbuf[1], dbgbuf[2], dbgbuf[3]);
if (!buf) {
retval = -EINVAL;
break;
}
if (copy_from_user(&xfer, (void __user *)arg, sizeof(xfer))) {
retval = -EFAULT;
break;
}
if ((xfer.size <= buflen) &&
(copy_to_user((void __user *)xfer.data, buf,
xfer.size))) {
retval = -EFAULT;
break;
}
break;
case MSM_BUSPM_IOC_WRBUF:
pr_debug("Write Buffer\n");
if (!buf) {
retval = -EINVAL;
break;
}
if (copy_from_user(&xfer, (void __user *)arg, sizeof(xfer))) {
retval = -EFAULT;
break;
}
if ((buflen <= xfer.size) &&
(copy_from_user(buf, (void __user *)xfer.data,
xfer.size))) {
retval = -EFAULT;
break;
}
break;
case MSM_BUSPM_IOC_CMD:
pr_debug("IOCTL command: cmd: %d arg: %lu\n", cmd, arg);
retval = msm_buspm_ioc_cmds(arg);
break;
default:
pr_debug("Unknown command 0x%x\n", cmd);
retval = -EINVAL;
break;
}
return retval;
}
static int msm_buspm_dev_release(struct inode *inode, struct file *filp)
{
struct msm_buspm_map_dev *dev = filp->private_data;
msm_buspm_dev_free(filp);
kfree(dev);
filp->private_data = NULL;
return 0;
}
static int msm_buspm_dev_mmap(struct file *filp, struct vm_area_struct *vma)
{
pr_debug("vma = 0x%p\n", vma);
/* Mappings are uncached */
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start, vma->vm_page_prot))
return -EFAULT;
return 0;
}
static const struct file_operations msm_buspm_dev_fops = {
.owner = THIS_MODULE,
.mmap = msm_buspm_dev_mmap,
.open = msm_buspm_dev_open,
.unlocked_ioctl = msm_buspm_dev_ioctl,
.llseek = noop_llseek,
.release = msm_buspm_dev_release,
};
struct miscdevice msm_buspm_misc = {
.minor = MISC_DYNAMIC_MINOR,
.name = MSM_BUSPM_DRV_NAME,
.fops = &msm_buspm_dev_fops,
};
static int __init msm_buspm_dev_init(void)
{
int ret = 0;
ret = misc_register(&msm_buspm_misc);
if (ret < 0)
pr_err("%s: Cannot register misc device\n", __func__);
return ret;
}
static void __exit msm_buspm_dev_exit(void)
{
misc_deregister(&msm_buspm_misc);
}
module_init(msm_buspm_dev_init);
module_exit(msm_buspm_dev_exit);
MODULE_LICENSE("GPL v2");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:"MSM_BUSPM_DRV_NAME);