| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Common CPM code |
| * |
| * Author: Scott Wood <scottwood@freescale.com> |
| * |
| * Copyright 2007-2008,2010 Freescale Semiconductor, Inc. |
| * |
| * Some parts derived from commproc.c/cpm2_common.c, which is: |
| * Copyright (c) 1997 Dan error_act (dmalek@jlc.net) |
| * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com> |
| * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com) |
| * 2006 (c) MontaVista Software, Inc. |
| * Vitaly Bordug <vbordug@ru.mvista.com> |
| */ |
| #include <linux/genalloc.h> |
| #include <linux/init.h> |
| #include <linux/list.h> |
| #include <linux/of_device.h> |
| #include <linux/spinlock.h> |
| #include <linux/export.h> |
| #include <linux/of.h> |
| #include <linux/of_address.h> |
| #include <linux/slab.h> |
| #include <linux/io.h> |
| #include <soc/fsl/qe/qe.h> |
| |
| static struct gen_pool *muram_pool; |
| static DEFINE_SPINLOCK(cpm_muram_lock); |
| static void __iomem *muram_vbase; |
| static phys_addr_t muram_pbase; |
| |
| struct muram_block { |
| struct list_head head; |
| s32 start; |
| int size; |
| }; |
| |
| static LIST_HEAD(muram_block_list); |
| |
| /* max address size we deal with */ |
| #define OF_MAX_ADDR_CELLS 4 |
| #define GENPOOL_OFFSET (4096 * 8) |
| |
| int cpm_muram_init(void) |
| { |
| struct device_node *np; |
| struct resource r; |
| __be32 zero[OF_MAX_ADDR_CELLS] = {}; |
| resource_size_t max = 0; |
| int i = 0; |
| int ret = 0; |
| |
| if (muram_pbase) |
| return 0; |
| |
| np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data"); |
| if (!np) { |
| /* try legacy bindings */ |
| np = of_find_node_by_name(NULL, "data-only"); |
| if (!np) { |
| pr_err("Cannot find CPM muram data node"); |
| ret = -ENODEV; |
| goto out_muram; |
| } |
| } |
| |
| muram_pool = gen_pool_create(0, -1); |
| if (!muram_pool) { |
| pr_err("Cannot allocate memory pool for CPM/QE muram"); |
| ret = -ENOMEM; |
| goto out_muram; |
| } |
| muram_pbase = of_translate_address(np, zero); |
| if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) { |
| pr_err("Cannot translate zero through CPM muram node"); |
| ret = -ENODEV; |
| goto out_pool; |
| } |
| |
| while (of_address_to_resource(np, i++, &r) == 0) { |
| if (r.end > max) |
| max = r.end; |
| ret = gen_pool_add(muram_pool, r.start - muram_pbase + |
| GENPOOL_OFFSET, resource_size(&r), -1); |
| if (ret) { |
| pr_err("QE: couldn't add muram to pool!\n"); |
| goto out_pool; |
| } |
| } |
| |
| muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1); |
| if (!muram_vbase) { |
| pr_err("Cannot map QE muram"); |
| ret = -ENOMEM; |
| goto out_pool; |
| } |
| goto out_muram; |
| out_pool: |
| gen_pool_destroy(muram_pool); |
| out_muram: |
| of_node_put(np); |
| return ret; |
| } |
| |
| /* |
| * cpm_muram_alloc_common - cpm_muram_alloc common code |
| * @size: number of bytes to allocate |
| * @algo: algorithm for alloc. |
| * @data: data for genalloc's algorithm. |
| * |
| * This function returns a non-negative offset into the muram area, or |
| * a negative errno on failure. |
| */ |
| static s32 cpm_muram_alloc_common(unsigned long size, |
| genpool_algo_t algo, void *data) |
| { |
| struct muram_block *entry; |
| s32 start; |
| |
| entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
| if (!entry) |
| return -ENOMEM; |
| start = gen_pool_alloc_algo(muram_pool, size, algo, data); |
| if (!start) { |
| kfree(entry); |
| return -ENOMEM; |
| } |
| start = start - GENPOOL_OFFSET; |
| memset_io(cpm_muram_addr(start), 0, size); |
| entry->start = start; |
| entry->size = size; |
| list_add(&entry->head, &muram_block_list); |
| |
| return start; |
| } |
| |
| /* |
| * cpm_muram_alloc - allocate the requested size worth of multi-user ram |
| * @size: number of bytes to allocate |
| * @align: requested alignment, in bytes |
| * |
| * This function returns a non-negative offset into the muram area, or |
| * a negative errno on failure. |
| * Use cpm_dpram_addr() to get the virtual address of the area. |
| * Use cpm_muram_free() to free the allocation. |
| */ |
| s32 cpm_muram_alloc(unsigned long size, unsigned long align) |
| { |
| s32 start; |
| unsigned long flags; |
| struct genpool_data_align muram_pool_data; |
| |
| spin_lock_irqsave(&cpm_muram_lock, flags); |
| muram_pool_data.align = align; |
| start = cpm_muram_alloc_common(size, gen_pool_first_fit_align, |
| &muram_pool_data); |
| spin_unlock_irqrestore(&cpm_muram_lock, flags); |
| return start; |
| } |
| EXPORT_SYMBOL(cpm_muram_alloc); |
| |
| /** |
| * cpm_muram_free - free a chunk of multi-user ram |
| * @offset: The beginning of the chunk as returned by cpm_muram_alloc(). |
| */ |
| void cpm_muram_free(s32 offset) |
| { |
| unsigned long flags; |
| int size; |
| struct muram_block *tmp; |
| |
| if (offset < 0) |
| return; |
| |
| size = 0; |
| spin_lock_irqsave(&cpm_muram_lock, flags); |
| list_for_each_entry(tmp, &muram_block_list, head) { |
| if (tmp->start == offset) { |
| size = tmp->size; |
| list_del(&tmp->head); |
| kfree(tmp); |
| break; |
| } |
| } |
| gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size); |
| spin_unlock_irqrestore(&cpm_muram_lock, flags); |
| } |
| EXPORT_SYMBOL(cpm_muram_free); |
| |
| /* |
| * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram |
| * @offset: offset of allocation start address |
| * @size: number of bytes to allocate |
| * This function returns @offset if the area was available, a negative |
| * errno otherwise. |
| * Use cpm_dpram_addr() to get the virtual address of the area. |
| * Use cpm_muram_free() to free the allocation. |
| */ |
| s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size) |
| { |
| s32 start; |
| unsigned long flags; |
| struct genpool_data_fixed muram_pool_data_fixed; |
| |
| spin_lock_irqsave(&cpm_muram_lock, flags); |
| muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET; |
| start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc, |
| &muram_pool_data_fixed); |
| spin_unlock_irqrestore(&cpm_muram_lock, flags); |
| return start; |
| } |
| EXPORT_SYMBOL(cpm_muram_alloc_fixed); |
| |
| /** |
| * cpm_muram_addr - turn a muram offset into a virtual address |
| * @offset: muram offset to convert |
| */ |
| void __iomem *cpm_muram_addr(unsigned long offset) |
| { |
| return muram_vbase + offset; |
| } |
| EXPORT_SYMBOL(cpm_muram_addr); |
| |
| unsigned long cpm_muram_offset(const void __iomem *addr) |
| { |
| return addr - muram_vbase; |
| } |
| EXPORT_SYMBOL(cpm_muram_offset); |
| |
| /** |
| * cpm_muram_dma - turn a muram virtual address into a DMA address |
| * @addr: virtual address from cpm_muram_addr() to convert |
| */ |
| dma_addr_t cpm_muram_dma(void __iomem *addr) |
| { |
| return muram_pbase + (addr - muram_vbase); |
| } |
| EXPORT_SYMBOL(cpm_muram_dma); |
| |
| /* |
| * As cpm_muram_free, but takes the virtual address rather than the |
| * muram offset. |
| */ |
| void cpm_muram_free_addr(const void __iomem *addr) |
| { |
| if (!addr) |
| return; |
| cpm_muram_free(cpm_muram_offset(addr)); |
| } |
| EXPORT_SYMBOL(cpm_muram_free_addr); |