// 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/device.h>
#include <linux/genalloc.h>
#include <linux/init.h>
#include <linux/list.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_muram_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);
static void devm_cpm_muram_release(struct device *dev, void *res)
{
s32 *info = res;
cpm_muram_free(*info);
}
/**
* devm_cpm_muram_alloc - Resource - managed cpm_muram_alloc
* @ dev : Device to allocate memory for
* @ 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 as cpm_muram_alloc ( ) does .
* Use cpm_muram_addr ( ) to get the virtual address of the area .
*
* Compare against cpm_muram_alloc ( ) , the memory allocated by this
* resource - managed version is automatically freed on driver detach and so ,
* cpm_muram_free ( ) must not be called to release the allocated memory .
*/
s32 devm_cpm_muram_alloc(struct device *dev, unsigned long size,
unsigned long align)
{
s32 info;
s32 *dr;
dr = devres_alloc(devm_cpm_muram_release, sizeof (*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
info = cpm_muram_alloc(size, align);
if (info >= 0 ) {
*dr = info;
devres_add(dev, dr);
} else {
devres_free(dr);
}
return info;
}
EXPORT_SYMBOL(devm_cpm_muram_alloc);
/*
* 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_muram_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);
/**
* devm_cpm_muram_alloc_fixed - Resource - managed cpm_muram_alloc_fixed
* @ dev : Device to allocate memory for
* @ offset : offset of allocation start address
* @ size : number of bytes to allocate
*
* This function returns a non - negative offset into the muram area , or
* a negative errno on failure as cpm_muram_alloc_fixed ( ) does .
* Use cpm_muram_addr ( ) to get the virtual address of the area .
*
* Compare against cpm_muram_alloc_fixed ( ) , the memory allocated by this
* resource - managed version is automatically freed on driver detach and so ,
* cpm_muram_free ( ) must not be called to release the allocated memory .
*/
s32 devm_cpm_muram_alloc_fixed(struct device *dev, unsigned long offset,
unsigned long size)
{
s32 info;
s32 *dr;
dr = devres_alloc(devm_cpm_muram_release, sizeof (*dr), GFP_KERNEL);
if (!dr)
return -ENOMEM;
info = cpm_muram_alloc_fixed(offset, size);
if (info >= 0 ) {
*dr = info;
devres_add(dev, dr);
} else {
devres_free(dr);
}
return info;
}
EXPORT_SYMBOL(devm_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);
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