366 lines
8.0 KiB
C
366 lines
8.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
|
|
* of PCI-SCSI IO processors.
|
|
*
|
|
* Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
|
|
*
|
|
* This driver is derived from the Linux sym53c8xx driver.
|
|
* Copyright (C) 1998-2000 Gerard Roudier
|
|
*
|
|
* The sym53c8xx driver is derived from the ncr53c8xx driver that had been
|
|
* a port of the FreeBSD ncr driver to Linux-1.2.13.
|
|
*
|
|
* The original ncr driver has been written for 386bsd and FreeBSD by
|
|
* Wolfgang Stanglmeier <wolf@cologne.de>
|
|
* Stefan Esser <se@mi.Uni-Koeln.de>
|
|
* Copyright (C) 1994 Wolfgang Stanglmeier
|
|
*
|
|
* Other major contributions:
|
|
*
|
|
* NVRAM detection and reading.
|
|
* Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
|
|
*
|
|
*-----------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include "sym_glue.h"
|
|
|
|
/*
|
|
* Simple power of two buddy-like generic allocator.
|
|
* Provides naturally aligned memory chunks.
|
|
*
|
|
* This simple code is not intended to be fast, but to
|
|
* provide power of 2 aligned memory allocations.
|
|
* Since the SCRIPTS processor only supplies 8 bit arithmetic,
|
|
* this allocator allows simple and fast address calculations
|
|
* from the SCRIPTS code. In addition, cache line alignment
|
|
* is guaranteed for power of 2 cache line size.
|
|
*
|
|
* This allocator has been developed for the Linux sym53c8xx
|
|
* driver, since this O/S does not provide naturally aligned
|
|
* allocations.
|
|
* It has the advantage of allowing the driver to use private
|
|
* pages of memory that will be useful if we ever need to deal
|
|
* with IO MMUs for PCI.
|
|
*/
|
|
static void *___sym_malloc(m_pool_p mp, int size)
|
|
{
|
|
int i = 0;
|
|
int s = (1 << SYM_MEM_SHIFT);
|
|
int j;
|
|
void *a;
|
|
m_link_p h = mp->h;
|
|
|
|
if (size > SYM_MEM_CLUSTER_SIZE)
|
|
return NULL;
|
|
|
|
while (size > s) {
|
|
s <<= 1;
|
|
++i;
|
|
}
|
|
|
|
j = i;
|
|
while (!h[j].next) {
|
|
if (s == SYM_MEM_CLUSTER_SIZE) {
|
|
h[j].next = (m_link_p) M_GET_MEM_CLUSTER();
|
|
if (h[j].next)
|
|
h[j].next->next = NULL;
|
|
break;
|
|
}
|
|
++j;
|
|
s <<= 1;
|
|
}
|
|
a = h[j].next;
|
|
if (a) {
|
|
h[j].next = h[j].next->next;
|
|
while (j > i) {
|
|
j -= 1;
|
|
s >>= 1;
|
|
h[j].next = (m_link_p) (a+s);
|
|
h[j].next->next = NULL;
|
|
}
|
|
}
|
|
#ifdef DEBUG
|
|
printf("___sym_malloc(%d) = %p\n", size, (void *) a);
|
|
#endif
|
|
return a;
|
|
}
|
|
|
|
/*
|
|
* Counter-part of the generic allocator.
|
|
*/
|
|
static void ___sym_mfree(m_pool_p mp, void *ptr, int size)
|
|
{
|
|
int i = 0;
|
|
int s = (1 << SYM_MEM_SHIFT);
|
|
m_link_p q;
|
|
unsigned long a, b;
|
|
m_link_p h = mp->h;
|
|
|
|
#ifdef DEBUG
|
|
printf("___sym_mfree(%p, %d)\n", ptr, size);
|
|
#endif
|
|
|
|
if (size > SYM_MEM_CLUSTER_SIZE)
|
|
return;
|
|
|
|
while (size > s) {
|
|
s <<= 1;
|
|
++i;
|
|
}
|
|
|
|
a = (unsigned long)ptr;
|
|
|
|
while (1) {
|
|
if (s == SYM_MEM_CLUSTER_SIZE) {
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
M_FREE_MEM_CLUSTER((void *)a);
|
|
#else
|
|
((m_link_p) a)->next = h[i].next;
|
|
h[i].next = (m_link_p) a;
|
|
#endif
|
|
break;
|
|
}
|
|
b = a ^ s;
|
|
q = &h[i];
|
|
while (q->next && q->next != (m_link_p) b) {
|
|
q = q->next;
|
|
}
|
|
if (!q->next) {
|
|
((m_link_p) a)->next = h[i].next;
|
|
h[i].next = (m_link_p) a;
|
|
break;
|
|
}
|
|
q->next = q->next->next;
|
|
a = a & b;
|
|
s <<= 1;
|
|
++i;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Verbose and zeroing allocator that wrapps to the generic allocator.
|
|
*/
|
|
static void *__sym_calloc2(m_pool_p mp, int size, char *name, int uflags)
|
|
{
|
|
void *p;
|
|
|
|
p = ___sym_malloc(mp, size);
|
|
|
|
if (DEBUG_FLAGS & DEBUG_ALLOC) {
|
|
printf ("new %-10s[%4d] @%p.\n", name, size, p);
|
|
}
|
|
|
|
if (p)
|
|
memset(p, 0, size);
|
|
else if (uflags & SYM_MEM_WARN)
|
|
printf ("__sym_calloc2: failed to allocate %s[%d]\n", name, size);
|
|
return p;
|
|
}
|
|
#define __sym_calloc(mp, s, n) __sym_calloc2(mp, s, n, SYM_MEM_WARN)
|
|
|
|
/*
|
|
* Its counter-part.
|
|
*/
|
|
static void __sym_mfree(m_pool_p mp, void *ptr, int size, char *name)
|
|
{
|
|
if (DEBUG_FLAGS & DEBUG_ALLOC)
|
|
printf ("freeing %-10s[%4d] @%p.\n", name, size, ptr);
|
|
|
|
___sym_mfree(mp, ptr, size);
|
|
}
|
|
|
|
/*
|
|
* Default memory pool we donnot need to involve in DMA.
|
|
*
|
|
* With DMA abstraction, we use functions (methods), to
|
|
* distinguish between non DMAable memory and DMAable memory.
|
|
*/
|
|
static void *___mp0_get_mem_cluster(m_pool_p mp)
|
|
{
|
|
void *m = sym_get_mem_cluster();
|
|
if (m)
|
|
++mp->nump;
|
|
return m;
|
|
}
|
|
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
static void ___mp0_free_mem_cluster(m_pool_p mp, void *m)
|
|
{
|
|
sym_free_mem_cluster(m);
|
|
--mp->nump;
|
|
}
|
|
#else
|
|
#define ___mp0_free_mem_cluster NULL
|
|
#endif
|
|
|
|
static struct sym_m_pool mp0 = {
|
|
NULL,
|
|
___mp0_get_mem_cluster,
|
|
___mp0_free_mem_cluster
|
|
};
|
|
|
|
/*
|
|
* Methods that maintains DMAable pools according to user allocations.
|
|
* New pools are created on the fly when a new pool id is provided.
|
|
* They are deleted on the fly when they get emptied.
|
|
*/
|
|
/* Get a memory cluster that matches the DMA constraints of a given pool */
|
|
static void * ___get_dma_mem_cluster(m_pool_p mp)
|
|
{
|
|
m_vtob_p vbp;
|
|
void *vaddr;
|
|
|
|
vbp = __sym_calloc(&mp0, sizeof(*vbp), "VTOB");
|
|
if (!vbp)
|
|
goto out_err;
|
|
|
|
vaddr = sym_m_get_dma_mem_cluster(mp, vbp);
|
|
if (vaddr) {
|
|
int hc = VTOB_HASH_CODE(vaddr);
|
|
vbp->next = mp->vtob[hc];
|
|
mp->vtob[hc] = vbp;
|
|
++mp->nump;
|
|
}
|
|
return vaddr;
|
|
out_err:
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
/* Free a memory cluster and associated resources for DMA */
|
|
static void ___free_dma_mem_cluster(m_pool_p mp, void *m)
|
|
{
|
|
m_vtob_p *vbpp, vbp;
|
|
int hc = VTOB_HASH_CODE(m);
|
|
|
|
vbpp = &mp->vtob[hc];
|
|
while (*vbpp && (*vbpp)->vaddr != m)
|
|
vbpp = &(*vbpp)->next;
|
|
if (*vbpp) {
|
|
vbp = *vbpp;
|
|
*vbpp = (*vbpp)->next;
|
|
sym_m_free_dma_mem_cluster(mp, vbp);
|
|
__sym_mfree(&mp0, vbp, sizeof(*vbp), "VTOB");
|
|
--mp->nump;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Fetch the memory pool for a given pool id (i.e. DMA constraints) */
|
|
static inline m_pool_p ___get_dma_pool(m_pool_ident_t dev_dmat)
|
|
{
|
|
m_pool_p mp;
|
|
for (mp = mp0.next;
|
|
mp && !sym_m_pool_match(mp->dev_dmat, dev_dmat);
|
|
mp = mp->next);
|
|
return mp;
|
|
}
|
|
|
|
/* Create a new memory DMAable pool (when fetch failed) */
|
|
static m_pool_p ___cre_dma_pool(m_pool_ident_t dev_dmat)
|
|
{
|
|
m_pool_p mp = __sym_calloc(&mp0, sizeof(*mp), "MPOOL");
|
|
if (mp) {
|
|
mp->dev_dmat = dev_dmat;
|
|
mp->get_mem_cluster = ___get_dma_mem_cluster;
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
mp->free_mem_cluster = ___free_dma_mem_cluster;
|
|
#endif
|
|
mp->next = mp0.next;
|
|
mp0.next = mp;
|
|
return mp;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
/* Destroy a DMAable memory pool (when got emptied) */
|
|
static void ___del_dma_pool(m_pool_p p)
|
|
{
|
|
m_pool_p *pp = &mp0.next;
|
|
|
|
while (*pp && *pp != p)
|
|
pp = &(*pp)->next;
|
|
if (*pp) {
|
|
*pp = (*pp)->next;
|
|
__sym_mfree(&mp0, p, sizeof(*p), "MPOOL");
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* This lock protects only the memory allocation/free. */
|
|
static DEFINE_SPINLOCK(sym53c8xx_lock);
|
|
|
|
/*
|
|
* Actual allocator for DMAable memory.
|
|
*/
|
|
void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name)
|
|
{
|
|
unsigned long flags;
|
|
m_pool_p mp;
|
|
void *m = NULL;
|
|
|
|
spin_lock_irqsave(&sym53c8xx_lock, flags);
|
|
mp = ___get_dma_pool(dev_dmat);
|
|
if (!mp)
|
|
mp = ___cre_dma_pool(dev_dmat);
|
|
if (!mp)
|
|
goto out;
|
|
m = __sym_calloc(mp, size, name);
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
if (!mp->nump)
|
|
___del_dma_pool(mp);
|
|
#endif
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&sym53c8xx_lock, flags);
|
|
return m;
|
|
}
|
|
|
|
void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name)
|
|
{
|
|
unsigned long flags;
|
|
m_pool_p mp;
|
|
|
|
spin_lock_irqsave(&sym53c8xx_lock, flags);
|
|
mp = ___get_dma_pool(dev_dmat);
|
|
if (!mp)
|
|
goto out;
|
|
__sym_mfree(mp, m, size, name);
|
|
#ifdef SYM_MEM_FREE_UNUSED
|
|
if (!mp->nump)
|
|
___del_dma_pool(mp);
|
|
#endif
|
|
out:
|
|
spin_unlock_irqrestore(&sym53c8xx_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Actual virtual to bus physical address translator
|
|
* for 32 bit addressable DMAable memory.
|
|
*/
|
|
dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m)
|
|
{
|
|
unsigned long flags;
|
|
m_pool_p mp;
|
|
int hc = VTOB_HASH_CODE(m);
|
|
m_vtob_p vp = NULL;
|
|
void *a = (void *)((unsigned long)m & ~SYM_MEM_CLUSTER_MASK);
|
|
dma_addr_t b;
|
|
|
|
spin_lock_irqsave(&sym53c8xx_lock, flags);
|
|
mp = ___get_dma_pool(dev_dmat);
|
|
if (mp) {
|
|
vp = mp->vtob[hc];
|
|
while (vp && vp->vaddr != a)
|
|
vp = vp->next;
|
|
}
|
|
if (!vp)
|
|
panic("sym: VTOBUS FAILED!\n");
|
|
b = vp->baddr + (m - a);
|
|
spin_unlock_irqrestore(&sym53c8xx_lock, flags);
|
|
return b;
|
|
}
|