| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2013-2019, The Linux Foundation. All rights reserved. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/err.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/mutex.h> |
| #include <linux/list.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/dma-buf.h> |
| #include <linux/platform_device.h> |
| #include <linux/of_device.h> |
| #include <linux/export.h> |
| #include <linux/ion_kernel.h> |
| #include <ipc/apr.h> |
| #include <dsp/msm_audio_ion.h> |
| |
| #define MSM_AUDIO_ION_PROBED (1 << 0) |
| |
| #define MSM_AUDIO_ION_PHYS_ADDR(alloc_data) \ |
| alloc_data->table->sgl->dma_address |
| |
| #define MSM_AUDIO_SMMU_SID_OFFSET 32 |
| |
| struct msm_audio_ion_private { |
| bool smmu_enabled; |
| struct device *cb_dev; |
| u8 device_status; |
| struct list_head alloc_list; |
| struct mutex list_mutex; |
| u64 smmu_sid_bits; |
| u32 smmu_version; |
| }; |
| |
| struct msm_audio_alloc_data { |
| size_t len; |
| void *vaddr; |
| struct dma_buf *dma_buf; |
| struct dma_buf_attachment *attach; |
| struct sg_table *table; |
| struct list_head list; |
| }; |
| |
| static struct msm_audio_ion_private msm_audio_ion_data = {0,}; |
| |
| static void msm_audio_ion_add_allocation( |
| struct msm_audio_ion_private *msm_audio_ion_data, |
| struct msm_audio_alloc_data *alloc_data) |
| { |
| /* |
| * Since these APIs can be invoked by multiple |
| * clients, there is need to make sure the list |
| * of allocations is always protected |
| */ |
| mutex_lock(&(msm_audio_ion_data->list_mutex)); |
| list_add_tail(&(alloc_data->list), |
| &(msm_audio_ion_data->alloc_list)); |
| mutex_unlock(&(msm_audio_ion_data->list_mutex)); |
| } |
| |
| static int msm_audio_dma_buf_map(struct dma_buf *dma_buf, |
| dma_addr_t *addr, size_t *len) |
| { |
| |
| struct msm_audio_alloc_data *alloc_data; |
| struct device *cb_dev; |
| unsigned long ionflag = 0; |
| int rc = 0; |
| |
| cb_dev = msm_audio_ion_data.cb_dev; |
| |
| /* Data required per buffer mapping */ |
| alloc_data = kzalloc(sizeof(*alloc_data), GFP_KERNEL); |
| if (!alloc_data) |
| return -ENOMEM; |
| |
| alloc_data->dma_buf = dma_buf; |
| alloc_data->len = dma_buf->size; |
| *len = dma_buf->size; |
| |
| /* Attach the dma_buf to context bank device */ |
| alloc_data->attach = dma_buf_attach(alloc_data->dma_buf, |
| cb_dev); |
| if (IS_ERR(alloc_data->attach)) { |
| rc = PTR_ERR(alloc_data->attach); |
| dev_err(cb_dev, |
| "%s: Fail to attach dma_buf to CB, rc = %d\n", |
| __func__, rc); |
| goto free_alloc_data; |
| } |
| |
| /* For uncached buffers, avoid cache maintanance */ |
| rc = dma_buf_get_flags(alloc_data->dma_buf, &ionflag); |
| if (rc) { |
| dev_err(cb_dev, "%s: dma_buf_get_flags failed: %d\n", |
| __func__, rc); |
| goto detach_dma_buf; |
| } |
| |
| if (!(ionflag & ION_FLAG_CACHED)) |
| alloc_data->attach->dma_map_attrs |= DMA_ATTR_SKIP_CPU_SYNC; |
| |
| /* |
| * Get the scatter-gather list. |
| * There is no info as this is a write buffer or |
| * read buffer, hence the request is bi-directional |
| * to accommodate both read and write mappings. |
| */ |
| alloc_data->table = dma_buf_map_attachment(alloc_data->attach, |
| DMA_BIDIRECTIONAL); |
| if (IS_ERR(alloc_data->table)) { |
| rc = PTR_ERR(alloc_data->table); |
| dev_err(cb_dev, |
| "%s: Fail to map attachment, rc = %d\n", |
| __func__, rc); |
| goto detach_dma_buf; |
| } |
| |
| /* physical address from mapping */ |
| *addr = MSM_AUDIO_ION_PHYS_ADDR(alloc_data); |
| |
| msm_audio_ion_add_allocation(&msm_audio_ion_data, |
| alloc_data); |
| return rc; |
| |
| detach_dma_buf: |
| dma_buf_detach(alloc_data->dma_buf, |
| alloc_data->attach); |
| free_alloc_data: |
| kfree(alloc_data); |
| |
| return rc; |
| } |
| |
| static int msm_audio_dma_buf_unmap(struct dma_buf *dma_buf) |
| { |
| int rc = 0; |
| struct msm_audio_alloc_data *alloc_data = NULL; |
| struct list_head *ptr, *next; |
| struct device *cb_dev = msm_audio_ion_data.cb_dev; |
| bool found = false; |
| |
| /* |
| * Though list_for_each_safe is delete safe, lock |
| * should be explicitly acquired to avoid race condition |
| * on adding elements to the list. |
| */ |
| mutex_lock(&(msm_audio_ion_data.list_mutex)); |
| list_for_each_safe(ptr, next, |
| &(msm_audio_ion_data.alloc_list)) { |
| |
| alloc_data = list_entry(ptr, struct msm_audio_alloc_data, |
| list); |
| |
| if (alloc_data->dma_buf == dma_buf) { |
| found = true; |
| dma_buf_unmap_attachment(alloc_data->attach, |
| alloc_data->table, |
| DMA_BIDIRECTIONAL); |
| |
| dma_buf_detach(alloc_data->dma_buf, |
| alloc_data->attach); |
| |
| dma_buf_put(alloc_data->dma_buf); |
| |
| list_del(&(alloc_data->list)); |
| kfree(alloc_data); |
| break; |
| } |
| } |
| mutex_unlock(&(msm_audio_ion_data.list_mutex)); |
| |
| if (!found) { |
| dev_err(cb_dev, |
| "%s: cannot find allocation, dma_buf %pK", |
| __func__, dma_buf); |
| rc = -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| static int msm_audio_ion_get_phys(struct dma_buf *dma_buf, |
| dma_addr_t *addr, size_t *len) |
| { |
| int rc = 0; |
| |
| rc = msm_audio_dma_buf_map(dma_buf, addr, len); |
| if (rc) { |
| pr_err("%s: failed to map DMA buf, err = %d\n", |
| __func__, rc); |
| goto err; |
| } |
| if (msm_audio_ion_data.smmu_enabled) { |
| /* Append the SMMU SID information to the IOVA address */ |
| *addr |= msm_audio_ion_data.smmu_sid_bits; |
| } |
| |
| pr_debug("phys=%pK, len=%zd, rc=%d\n", &(*addr), *len, rc); |
| err: |
| return rc; |
| } |
| |
| int msm_audio_ion_get_smmu_info(struct device **cb_dev, |
| u64 *smmu_sid) |
| { |
| if (!cb_dev || !smmu_sid) { |
| pr_err("%s: Invalid params\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| if (!msm_audio_ion_data.cb_dev || |
| !msm_audio_ion_data.smmu_sid_bits) { |
| pr_err("%s: Params not initialized\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| *cb_dev = msm_audio_ion_data.cb_dev; |
| *smmu_sid = msm_audio_ion_data.smmu_sid_bits; |
| |
| return 0; |
| } |
| |
| static void *msm_audio_ion_map_kernel(struct dma_buf *dma_buf) |
| { |
| int rc = 0; |
| void *addr = NULL; |
| struct msm_audio_alloc_data *alloc_data = NULL; |
| |
| rc = dma_buf_begin_cpu_access(dma_buf, DMA_BIDIRECTIONAL); |
| if (rc) { |
| pr_err("%s: kmap dma_buf_begin_cpu_access fail\n", __func__); |
| goto exit; |
| } |
| |
| addr = dma_buf_vmap(dma_buf); |
| if (!addr) { |
| pr_err("%s: kernel mapping of dma_buf failed\n", |
| __func__); |
| goto exit; |
| } |
| |
| /* |
| * TBD: remove the below section once new API |
| * for mapping kernel virtual address is available. |
| */ |
| mutex_lock(&(msm_audio_ion_data.list_mutex)); |
| list_for_each_entry(alloc_data, &(msm_audio_ion_data.alloc_list), |
| list) { |
| if (alloc_data->dma_buf == dma_buf) { |
| alloc_data->vaddr = addr; |
| break; |
| } |
| } |
| mutex_unlock(&(msm_audio_ion_data.list_mutex)); |
| |
| exit: |
| return addr; |
| } |
| |
| static int msm_audio_ion_unmap_kernel(struct dma_buf *dma_buf) |
| { |
| int rc = 0; |
| void *vaddr = NULL; |
| struct msm_audio_alloc_data *alloc_data = NULL; |
| struct device *cb_dev = msm_audio_ion_data.cb_dev; |
| |
| /* |
| * TBD: remove the below section once new API |
| * for unmapping kernel virtual address is available. |
| */ |
| mutex_lock(&(msm_audio_ion_data.list_mutex)); |
| list_for_each_entry(alloc_data, &(msm_audio_ion_data.alloc_list), |
| list) { |
| if (alloc_data->dma_buf == dma_buf) { |
| vaddr = alloc_data->vaddr; |
| break; |
| } |
| } |
| mutex_unlock(&(msm_audio_ion_data.list_mutex)); |
| |
| if (!vaddr) { |
| dev_err(cb_dev, |
| "%s: cannot find allocation for dma_buf %pK", |
| __func__, dma_buf); |
| rc = -EINVAL; |
| goto err; |
| } |
| |
| dma_buf_vunmap(dma_buf, vaddr); |
| |
| rc = dma_buf_end_cpu_access(dma_buf, DMA_BIDIRECTIONAL); |
| if (rc) { |
| dev_err(cb_dev, "%s: kmap dma_buf_end_cpu_access fail\n", |
| __func__); |
| goto err; |
| } |
| |
| err: |
| return rc; |
| } |
| |
| static int msm_audio_ion_map_buf(struct dma_buf *dma_buf, dma_addr_t *paddr, |
| size_t *plen, void **vaddr) |
| { |
| int rc = 0; |
| |
| rc = msm_audio_ion_get_phys(dma_buf, paddr, plen); |
| if (rc) { |
| pr_err("%s: ION Get Physical for AUDIO failed, rc = %d\n", |
| __func__, rc); |
| dma_buf_put(dma_buf); |
| goto err; |
| } |
| |
| *vaddr = msm_audio_ion_map_kernel(dma_buf); |
| if (IS_ERR_OR_NULL(*vaddr)) { |
| pr_err("%s: ION memory mapping for AUDIO failed\n", __func__); |
| rc = -ENOMEM; |
| msm_audio_dma_buf_unmap(dma_buf); |
| goto err; |
| } |
| |
| err: |
| return rc; |
| } |
| |
| static u32 msm_audio_ion_get_smmu_sid_mode32(void) |
| { |
| if (msm_audio_ion_data.smmu_enabled) |
| return upper_32_bits(msm_audio_ion_data.smmu_sid_bits); |
| else |
| return 0; |
| } |
| |
| /** |
| * msm_audio_ion_alloc - |
| * Allocs ION memory for given client name |
| * |
| * @dma_buf: dma_buf for the ION memory |
| * @bufsz: buffer size |
| * @paddr: Physical address to be assigned with allocated region |
| * @plen: length of allocated region to be assigned |
| * vaddr: virtual address to be assigned |
| * |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_alloc(struct dma_buf **dma_buf, size_t bufsz, |
| dma_addr_t *paddr, size_t *plen, void **vaddr) |
| { |
| int rc = -EINVAL; |
| unsigned long err_ion_ptr = 0; |
| |
| if (!(msm_audio_ion_data.device_status & MSM_AUDIO_ION_PROBED)) { |
| pr_debug("%s:probe is not done, deferred\n", __func__); |
| return -EPROBE_DEFER; |
| } |
| if (!dma_buf || !paddr || !vaddr || !bufsz || !plen) { |
| pr_err("%s: Invalid params\n", __func__); |
| return -EINVAL; |
| } |
| |
| if (msm_audio_ion_data.smmu_enabled == true) { |
| pr_debug("%s: system heap is used\n", __func__); |
| *dma_buf = ion_alloc(bufsz, ION_HEAP(ION_SYSTEM_HEAP_ID), 0); |
| } else { |
| pr_debug("%s: audio heap is used\n", __func__); |
| *dma_buf = ion_alloc(bufsz, ION_HEAP(ION_AUDIO_HEAP_ID), 0); |
| } |
| if (IS_ERR_OR_NULL((void *)(*dma_buf))) { |
| if (IS_ERR((void *)(*dma_buf))) |
| err_ion_ptr = PTR_ERR((int *)(*dma_buf)); |
| pr_err("%s: ION alloc fail err ptr=%ld, smmu_enabled=%d\n", |
| __func__, err_ion_ptr, msm_audio_ion_data.smmu_enabled); |
| rc = -ENOMEM; |
| goto err; |
| } |
| |
| rc = msm_audio_ion_map_buf(*dma_buf, paddr, plen, vaddr); |
| if (rc) { |
| pr_err("%s: failed to map ION buf, rc = %d\n", __func__, rc); |
| goto err; |
| } |
| pr_debug("%s: mapped address = %pK, size=%zd\n", __func__, |
| *vaddr, bufsz); |
| |
| memset(*vaddr, 0, bufsz); |
| |
| err: |
| return rc; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_alloc); |
| |
| /** |
| * msm_audio_ion_dma_map - |
| * Memory maps for a given DMA buffer |
| * |
| * @phys_addr: Physical address of DMA buffer to be mapped |
| * @iova_base: IOVA address of memory mapped DMA buffer |
| * @size: buffer size |
| * @dir: DMA direction |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_dma_map(dma_addr_t *phys_addr, dma_addr_t *iova_base, |
| u32 size, enum dma_data_direction dir) |
| { |
| dma_addr_t iova; |
| struct device *cb_dev = msm_audio_ion_data.cb_dev; |
| |
| if (!phys_addr || !iova_base || !size) |
| return -EINVAL; |
| |
| iova = dma_map_resource(cb_dev, *phys_addr, size, |
| dir, 0); |
| if (dma_mapping_error(cb_dev, iova)) { |
| pr_err("%s: dma_mapping_error\n", __func__); |
| return -EIO; |
| } |
| pr_debug("%s: dma_mapping_success iova:0x%lx\n", __func__, |
| (unsigned long)iova); |
| if (msm_audio_ion_data.smmu_enabled) |
| /* Append the SMMU SID information to the IOVA address */ |
| iova |= msm_audio_ion_data.smmu_sid_bits; |
| |
| *iova_base = iova; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_dma_map); |
| |
| /** |
| * msm_audio_ion_import- |
| * Import ION buffer with given file descriptor |
| * |
| * @dma_buf: dma_buf for the ION memory |
| * @fd: file descriptor for the ION memory |
| * @ionflag: flags associated with ION buffer |
| * @bufsz: buffer size |
| * @paddr: Physical address to be assigned with allocated region |
| * @plen: length of allocated region to be assigned |
| * vaddr: virtual address to be assigned |
| * |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_import(struct dma_buf **dma_buf, int fd, |
| unsigned long *ionflag, size_t bufsz, |
| dma_addr_t *paddr, size_t *plen, void **vaddr) |
| { |
| int rc = 0; |
| |
| if (!(msm_audio_ion_data.device_status & MSM_AUDIO_ION_PROBED)) { |
| pr_debug("%s: probe is not done, deferred\n", __func__); |
| return -EPROBE_DEFER; |
| } |
| |
| if (!dma_buf || !paddr || !vaddr || !plen) { |
| pr_err("%s: Invalid params\n", __func__); |
| return -EINVAL; |
| } |
| |
| /* bufsz should be 0 and fd shouldn't be 0 as of now */ |
| *dma_buf = dma_buf_get(fd); |
| pr_debug("%s: dma_buf =%pK, fd=%d\n", __func__, *dma_buf, fd); |
| if (IS_ERR_OR_NULL((void *)(*dma_buf))) { |
| pr_err("%s: dma_buf_get failed\n", __func__); |
| rc = -EINVAL; |
| goto err; |
| } |
| |
| if (ionflag != NULL) { |
| rc = dma_buf_get_flags(*dma_buf, ionflag); |
| if (rc) { |
| pr_err("%s: could not get flags for the dma_buf\n", |
| __func__); |
| goto err_ion_flag; |
| } |
| } |
| |
| rc = msm_audio_ion_map_buf(*dma_buf, paddr, plen, vaddr); |
| if (rc) { |
| pr_err("%s: failed to map ION buf, rc = %d\n", __func__, rc); |
| goto err; |
| } |
| pr_debug("%s: mapped address = %pK, size=%zd\n", __func__, |
| *vaddr, bufsz); |
| |
| return 0; |
| |
| err_ion_flag: |
| dma_buf_put(*dma_buf); |
| err: |
| *dma_buf = NULL; |
| return rc; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_import); |
| |
| /** |
| * msm_audio_ion_free - |
| * fress ION memory for given client and handle |
| * |
| * @dma_buf: dma_buf for the ION memory |
| * |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_free(struct dma_buf *dma_buf) |
| { |
| int ret = 0; |
| |
| if (!dma_buf) { |
| pr_err("%s: dma_buf invalid\n", __func__); |
| return -EINVAL; |
| } |
| |
| ret = msm_audio_ion_unmap_kernel(dma_buf); |
| if (ret) |
| return ret; |
| |
| msm_audio_dma_buf_unmap(dma_buf); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_free); |
| |
| /** |
| * msm_audio_ion_mmap - |
| * Audio ION memory map |
| * |
| * @abuff: audio buf pointer |
| * @vma: virtual mem area |
| * |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_mmap(struct audio_buffer *abuff, |
| struct vm_area_struct *vma) |
| { |
| struct msm_audio_alloc_data *alloc_data = NULL; |
| struct sg_table *table; |
| unsigned long addr = vma->vm_start; |
| unsigned long offset = vma->vm_pgoff * PAGE_SIZE; |
| struct scatterlist *sg; |
| unsigned int i; |
| struct page *page; |
| int ret = 0; |
| bool found = false; |
| struct device *cb_dev = msm_audio_ion_data.cb_dev; |
| |
| mutex_lock(&(msm_audio_ion_data.list_mutex)); |
| list_for_each_entry(alloc_data, &(msm_audio_ion_data.alloc_list), |
| list) { |
| if (alloc_data->dma_buf == abuff->dma_buf) { |
| found = true; |
| table = alloc_data->table; |
| break; |
| } |
| } |
| mutex_unlock(&(msm_audio_ion_data.list_mutex)); |
| |
| if (!found) { |
| dev_err(cb_dev, |
| "%s: cannot find allocation, dma_buf %pK", |
| __func__, abuff->dma_buf); |
| return -EINVAL; |
| } |
| /* uncached */ |
| vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
| |
| /* We need to check if a page is associated with this sg list because: |
| * If the allocation came from a carveout we currently don't have |
| * pages associated with carved out memory. This might change in the |
| * future and we can remove this check and the else statement. |
| */ |
| page = sg_page(table->sgl); |
| if (page) { |
| pr_debug("%s: page is NOT null\n", __func__); |
| for_each_sg(table->sgl, sg, table->nents, i) { |
| unsigned long remainder = vma->vm_end - addr; |
| unsigned long len = sg->length; |
| |
| page = sg_page(sg); |
| |
| if (offset >= len) { |
| offset -= len; |
| continue; |
| } else if (offset) { |
| page += offset / PAGE_SIZE; |
| len -= offset; |
| offset = 0; |
| } |
| len = min(len, remainder); |
| pr_debug("vma=%pK, addr=%x len=%ld vm_start=%x vm_end=%x vm_page_prot=%lu\n", |
| vma, (unsigned int)addr, len, |
| (unsigned int)vma->vm_start, |
| (unsigned int)vma->vm_end, |
| (unsigned long)pgprot_val(vma->vm_page_prot)); |
| remap_pfn_range(vma, addr, page_to_pfn(page), len, |
| vma->vm_page_prot); |
| addr += len; |
| if (addr >= vma->vm_end) |
| return 0; |
| } |
| } else { |
| pr_debug("%s: page is NULL\n", __func__); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_mmap); |
| |
| /** |
| * msm_audio_ion_cache_operations- |
| * Cache operations on cached Audio ION buffers |
| * |
| * @abuff: audio buf pointer |
| * @cache_op: cache operation to be performed |
| * |
| * Returns 0 on success or error on failure |
| */ |
| int msm_audio_ion_cache_operations(struct audio_buffer *abuff, int cache_op) |
| { |
| unsigned long ionflag = 0; |
| int rc = 0; |
| |
| if (!abuff) { |
| pr_err("%s: Invalid params: %pK\n", __func__, abuff); |
| return -EINVAL; |
| } |
| rc = dma_buf_get_flags(abuff->dma_buf, &ionflag); |
| if (rc) { |
| pr_err("%s: dma_buf_get_flags failed: %d\n", __func__, rc); |
| goto cache_op_failed; |
| } |
| |
| /* Has to be CACHED */ |
| if (ionflag & ION_FLAG_CACHED) { |
| /* MSM_AUDIO_ION_INV_CACHES or MSM_AUDIO_ION_CLEAN_CACHES */ |
| switch (cache_op) { |
| case MSM_AUDIO_ION_INV_CACHES: |
| case MSM_AUDIO_ION_CLEAN_CACHES: |
| dma_buf_begin_cpu_access(abuff->dma_buf, |
| DMA_BIDIRECTIONAL); |
| dma_buf_end_cpu_access(abuff->dma_buf, |
| DMA_BIDIRECTIONAL); |
| break; |
| default: |
| pr_err("%s: Invalid cache operation %d\n", |
| __func__, cache_op); |
| } |
| } else { |
| pr_err("%s: Cache ops called on uncached buffer: %pK\n", |
| __func__, abuff->dma_buf); |
| rc = -EINVAL; |
| } |
| |
| cache_op_failed: |
| return rc; |
| } |
| EXPORT_SYMBOL(msm_audio_ion_cache_operations); |
| |
| /** |
| * msm_audio_populate_upper_32_bits - |
| * retrieve upper 32bits of 64bit address |
| * |
| * @pa: 64bit physical address |
| * |
| */ |
| u32 msm_audio_populate_upper_32_bits(dma_addr_t pa) |
| { |
| if (sizeof(dma_addr_t) == sizeof(u32)) |
| return msm_audio_ion_get_smmu_sid_mode32(); |
| else |
| return upper_32_bits(pa); |
| } |
| EXPORT_SYMBOL(msm_audio_populate_upper_32_bits); |
| |
| static int msm_audio_smmu_init(struct device *dev) |
| { |
| INIT_LIST_HEAD(&msm_audio_ion_data.alloc_list); |
| mutex_init(&(msm_audio_ion_data.list_mutex)); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id msm_audio_ion_dt_match[] = { |
| { .compatible = "qcom,msm-audio-ion" }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, msm_audio_ion_dt_match); |
| |
| static int msm_audio_ion_probe(struct platform_device *pdev) |
| { |
| int rc = 0; |
| u64 smmu_sid = 0; |
| u64 smmu_sid_mask = 0; |
| const char *msm_audio_ion_dt = "qcom,smmu-enabled"; |
| const char *msm_audio_ion_smmu = "qcom,smmu-version"; |
| const char *msm_audio_ion_smmu_sid_mask = "qcom,smmu-sid-mask"; |
| bool smmu_enabled; |
| enum apr_subsys_state q6_state; |
| struct device *dev = &pdev->dev; |
| struct of_phandle_args iommuspec; |
| |
| |
| if (dev->of_node == NULL) { |
| dev_err(dev, |
| "%s: device tree is not found\n", |
| __func__); |
| msm_audio_ion_data.smmu_enabled = 0; |
| return 0; |
| } |
| |
| smmu_enabled = of_property_read_bool(dev->of_node, |
| msm_audio_ion_dt); |
| msm_audio_ion_data.smmu_enabled = smmu_enabled; |
| |
| if (!smmu_enabled) { |
| dev_dbg(dev, "%s: SMMU is Disabled\n", __func__); |
| goto exit; |
| } |
| |
| q6_state = apr_get_q6_state(); |
| if (q6_state == APR_SUBSYS_DOWN) { |
| dev_dbg(dev, |
| "defering %s, adsp_state %d\n", |
| __func__, q6_state); |
| return -EPROBE_DEFER; |
| } |
| dev_dbg(dev, "%s: adsp is ready\n", __func__); |
| |
| rc = of_property_read_u32(dev->of_node, |
| msm_audio_ion_smmu, |
| &msm_audio_ion_data.smmu_version); |
| if (rc) { |
| dev_err(dev, |
| "%s: qcom,smmu_version missing in DT node\n", |
| __func__); |
| return rc; |
| } |
| dev_dbg(dev, "%s: SMMU is Enabled. SMMU version is (%d)", |
| __func__, msm_audio_ion_data.smmu_version); |
| |
| /* Get SMMU SID information from Devicetree */ |
| rc = of_property_read_u64(dev->of_node, |
| msm_audio_ion_smmu_sid_mask, |
| &smmu_sid_mask); |
| if (rc) { |
| dev_err(dev, |
| "%s: qcom,smmu-sid-mask missing in DT node, using default\n", |
| __func__); |
| smmu_sid_mask = 0xFFFFFFFFFFFFFFFF; |
| } |
| |
| rc = of_parse_phandle_with_args(dev->of_node, "iommus", |
| "#iommu-cells", 0, &iommuspec); |
| if (rc) |
| dev_err(dev, "%s: could not get smmu SID, ret = %d\n", |
| __func__, rc); |
| else |
| smmu_sid = (iommuspec.args[0] & smmu_sid_mask); |
| |
| msm_audio_ion_data.smmu_sid_bits = |
| smmu_sid << MSM_AUDIO_SMMU_SID_OFFSET; |
| |
| if (msm_audio_ion_data.smmu_version == 0x2) { |
| rc = msm_audio_smmu_init(dev); |
| } else { |
| dev_err(dev, "%s: smmu version invalid %d\n", |
| __func__, msm_audio_ion_data.smmu_version); |
| rc = -EINVAL; |
| } |
| if (rc) |
| dev_err(dev, "%s: smmu init failed, err = %d\n", |
| __func__, rc); |
| |
| exit: |
| if (!rc) |
| msm_audio_ion_data.device_status |= MSM_AUDIO_ION_PROBED; |
| |
| msm_audio_ion_data.cb_dev = dev; |
| |
| return rc; |
| } |
| |
| static int msm_audio_ion_remove(struct platform_device *pdev) |
| { |
| struct device *audio_cb_dev; |
| |
| audio_cb_dev = msm_audio_ion_data.cb_dev; |
| |
| msm_audio_ion_data.smmu_enabled = 0; |
| msm_audio_ion_data.device_status = 0; |
| return 0; |
| } |
| |
| static struct platform_driver msm_audio_ion_driver = { |
| .driver = { |
| .name = "msm-audio-ion", |
| .owner = THIS_MODULE, |
| .of_match_table = msm_audio_ion_dt_match, |
| .suppress_bind_attrs = true, |
| }, |
| .probe = msm_audio_ion_probe, |
| .remove = msm_audio_ion_remove, |
| }; |
| |
| int __init msm_audio_ion_init(void) |
| { |
| return platform_driver_register(&msm_audio_ion_driver); |
| } |
| |
| void msm_audio_ion_exit(void) |
| { |
| platform_driver_unregister(&msm_audio_ion_driver); |
| } |
| |
| MODULE_DESCRIPTION("MSM Audio ION module"); |
| MODULE_LICENSE("GPL v2"); |