379 lines
8.6 KiB
C
379 lines
8.6 KiB
C
/*
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* Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
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* of PCI-SCSI IO processors.
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*
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* Copyright (C) 1999-2001 Gerard Roudier <groudier@free.fr>
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*
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* This driver is derived from the Linux sym53c8xx driver.
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* Copyright (C) 1998-2000 Gerard Roudier
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*
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* The sym53c8xx driver is derived from the ncr53c8xx driver that had been
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* a port of the FreeBSD ncr driver to Linux-1.2.13.
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*
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* The original ncr driver has been written for 386bsd and FreeBSD by
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* Wolfgang Stanglmeier <wolf@cologne.de>
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* Stefan Esser <se@mi.Uni-Koeln.de>
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* Copyright (C) 1994 Wolfgang Stanglmeier
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*
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* Other major contributions:
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*
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* NVRAM detection and reading.
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* Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
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*
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*-----------------------------------------------------------------------------
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "sym_glue.h"
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/*
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* Simple power of two buddy-like generic allocator.
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* Provides naturally aligned memory chunks.
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*
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* This simple code is not intended to be fast, but to
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* provide power of 2 aligned memory allocations.
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* Since the SCRIPTS processor only supplies 8 bit arithmetic,
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* this allocator allows simple and fast address calculations
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* from the SCRIPTS code. In addition, cache line alignment
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* is guaranteed for power of 2 cache line size.
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*
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* This allocator has been developped for the Linux sym53c8xx
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* driver, since this O/S does not provide naturally aligned
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* allocations.
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* It has the advantage of allowing the driver to use private
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* pages of memory that will be useful if we ever need to deal
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* with IO MMUs for PCI.
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*/
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static void *___sym_malloc(m_pool_p mp, int size)
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{
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int i = 0;
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int s = (1 << SYM_MEM_SHIFT);
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int j;
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void *a;
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m_link_p h = mp->h;
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if (size > SYM_MEM_CLUSTER_SIZE)
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return NULL;
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while (size > s) {
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s <<= 1;
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++i;
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}
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j = i;
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while (!h[j].next) {
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if (s == SYM_MEM_CLUSTER_SIZE) {
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h[j].next = (m_link_p) M_GET_MEM_CLUSTER();
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if (h[j].next)
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h[j].next->next = NULL;
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break;
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}
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++j;
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s <<= 1;
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}
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a = h[j].next;
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if (a) {
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h[j].next = h[j].next->next;
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while (j > i) {
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j -= 1;
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s >>= 1;
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h[j].next = (m_link_p) (a+s);
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h[j].next->next = NULL;
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}
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}
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#ifdef DEBUG
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printf("___sym_malloc(%d) = %p\n", size, (void *) a);
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#endif
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return a;
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}
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/*
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* Counter-part of the generic allocator.
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*/
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static void ___sym_mfree(m_pool_p mp, void *ptr, int size)
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{
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int i = 0;
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int s = (1 << SYM_MEM_SHIFT);
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m_link_p q;
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unsigned long a, b;
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m_link_p h = mp->h;
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#ifdef DEBUG
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printf("___sym_mfree(%p, %d)\n", ptr, size);
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#endif
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if (size > SYM_MEM_CLUSTER_SIZE)
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return;
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while (size > s) {
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s <<= 1;
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++i;
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}
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a = (unsigned long)ptr;
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while (1) {
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if (s == SYM_MEM_CLUSTER_SIZE) {
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#ifdef SYM_MEM_FREE_UNUSED
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M_FREE_MEM_CLUSTER((void *)a);
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#else
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((m_link_p) a)->next = h[i].next;
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h[i].next = (m_link_p) a;
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#endif
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break;
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}
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b = a ^ s;
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q = &h[i];
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while (q->next && q->next != (m_link_p) b) {
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q = q->next;
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}
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if (!q->next) {
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((m_link_p) a)->next = h[i].next;
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h[i].next = (m_link_p) a;
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break;
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}
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q->next = q->next->next;
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a = a & b;
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s <<= 1;
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++i;
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}
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}
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/*
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* Verbose and zeroing allocator that wrapps to the generic allocator.
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*/
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static void *__sym_calloc2(m_pool_p mp, int size, char *name, int uflags)
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{
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void *p;
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p = ___sym_malloc(mp, size);
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if (DEBUG_FLAGS & DEBUG_ALLOC) {
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printf ("new %-10s[%4d] @%p.\n", name, size, p);
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}
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if (p)
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memset(p, 0, size);
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else if (uflags & SYM_MEM_WARN)
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printf ("__sym_calloc2: failed to allocate %s[%d]\n", name, size);
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return p;
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}
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#define __sym_calloc(mp, s, n) __sym_calloc2(mp, s, n, SYM_MEM_WARN)
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/*
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* Its counter-part.
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*/
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static void __sym_mfree(m_pool_p mp, void *ptr, int size, char *name)
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{
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if (DEBUG_FLAGS & DEBUG_ALLOC)
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printf ("freeing %-10s[%4d] @%p.\n", name, size, ptr);
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___sym_mfree(mp, ptr, size);
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}
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/*
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* Default memory pool we donnot need to involve in DMA.
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*
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* With DMA abstraction, we use functions (methods), to
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* distinguish between non DMAable memory and DMAable memory.
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*/
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static void *___mp0_get_mem_cluster(m_pool_p mp)
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{
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void *m = sym_get_mem_cluster();
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if (m)
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++mp->nump;
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return m;
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}
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#ifdef SYM_MEM_FREE_UNUSED
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static void ___mp0_free_mem_cluster(m_pool_p mp, void *m)
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{
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sym_free_mem_cluster(m);
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--mp->nump;
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}
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#else
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#define ___mp0_free_mem_cluster NULL
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#endif
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static struct sym_m_pool mp0 = {
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NULL,
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___mp0_get_mem_cluster,
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___mp0_free_mem_cluster
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};
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/*
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* Methods that maintains DMAable pools according to user allocations.
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* New pools are created on the fly when a new pool id is provided.
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* They are deleted on the fly when they get emptied.
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*/
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/* Get a memory cluster that matches the DMA constraints of a given pool */
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static void * ___get_dma_mem_cluster(m_pool_p mp)
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{
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m_vtob_p vbp;
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void *vaddr;
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vbp = __sym_calloc(&mp0, sizeof(*vbp), "VTOB");
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if (!vbp)
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goto out_err;
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vaddr = sym_m_get_dma_mem_cluster(mp, vbp);
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if (vaddr) {
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int hc = VTOB_HASH_CODE(vaddr);
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vbp->next = mp->vtob[hc];
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mp->vtob[hc] = vbp;
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++mp->nump;
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}
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return vaddr;
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out_err:
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return NULL;
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}
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#ifdef SYM_MEM_FREE_UNUSED
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/* Free a memory cluster and associated resources for DMA */
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static void ___free_dma_mem_cluster(m_pool_p mp, void *m)
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{
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m_vtob_p *vbpp, vbp;
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int hc = VTOB_HASH_CODE(m);
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vbpp = &mp->vtob[hc];
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while (*vbpp && (*vbpp)->vaddr != m)
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vbpp = &(*vbpp)->next;
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if (*vbpp) {
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vbp = *vbpp;
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*vbpp = (*vbpp)->next;
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sym_m_free_dma_mem_cluster(mp, vbp);
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__sym_mfree(&mp0, vbp, sizeof(*vbp), "VTOB");
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--mp->nump;
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}
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}
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#endif
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/* Fetch the memory pool for a given pool id (i.e. DMA constraints) */
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static __inline m_pool_p ___get_dma_pool(m_pool_ident_t dev_dmat)
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{
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m_pool_p mp;
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for (mp = mp0.next;
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mp && !sym_m_pool_match(mp->dev_dmat, dev_dmat);
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mp = mp->next);
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return mp;
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}
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/* Create a new memory DMAable pool (when fetch failed) */
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static m_pool_p ___cre_dma_pool(m_pool_ident_t dev_dmat)
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{
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m_pool_p mp = __sym_calloc(&mp0, sizeof(*mp), "MPOOL");
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if (mp) {
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mp->dev_dmat = dev_dmat;
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mp->get_mem_cluster = ___get_dma_mem_cluster;
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#ifdef SYM_MEM_FREE_UNUSED
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mp->free_mem_cluster = ___free_dma_mem_cluster;
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#endif
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mp->next = mp0.next;
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mp0.next = mp;
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return mp;
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}
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return NULL;
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}
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#ifdef SYM_MEM_FREE_UNUSED
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/* Destroy a DMAable memory pool (when got emptied) */
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static void ___del_dma_pool(m_pool_p p)
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{
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m_pool_p *pp = &mp0.next;
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while (*pp && *pp != p)
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pp = &(*pp)->next;
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if (*pp) {
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*pp = (*pp)->next;
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__sym_mfree(&mp0, p, sizeof(*p), "MPOOL");
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}
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}
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#endif
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/* This lock protects only the memory allocation/free. */
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static DEFINE_SPINLOCK(sym53c8xx_lock);
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/*
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* Actual allocator for DMAable memory.
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*/
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void *__sym_calloc_dma(m_pool_ident_t dev_dmat, int size, char *name)
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{
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unsigned long flags;
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m_pool_p mp;
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void *m = NULL;
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spin_lock_irqsave(&sym53c8xx_lock, flags);
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mp = ___get_dma_pool(dev_dmat);
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if (!mp)
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mp = ___cre_dma_pool(dev_dmat);
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if (!mp)
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goto out;
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m = __sym_calloc(mp, size, name);
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#ifdef SYM_MEM_FREE_UNUSED
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if (!mp->nump)
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___del_dma_pool(mp);
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#endif
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out:
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spin_unlock_irqrestore(&sym53c8xx_lock, flags);
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return m;
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}
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void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name)
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{
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unsigned long flags;
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m_pool_p mp;
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spin_lock_irqsave(&sym53c8xx_lock, flags);
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mp = ___get_dma_pool(dev_dmat);
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if (!mp)
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goto out;
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__sym_mfree(mp, m, size, name);
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#ifdef SYM_MEM_FREE_UNUSED
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if (!mp->nump)
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___del_dma_pool(mp);
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#endif
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out:
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spin_unlock_irqrestore(&sym53c8xx_lock, flags);
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}
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/*
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* Actual virtual to bus physical address translator
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* for 32 bit addressable DMAable memory.
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*/
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dma_addr_t __vtobus(m_pool_ident_t dev_dmat, void *m)
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{
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unsigned long flags;
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m_pool_p mp;
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int hc = VTOB_HASH_CODE(m);
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m_vtob_p vp = NULL;
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void *a = (void *)((unsigned long)m & ~SYM_MEM_CLUSTER_MASK);
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dma_addr_t b;
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spin_lock_irqsave(&sym53c8xx_lock, flags);
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mp = ___get_dma_pool(dev_dmat);
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if (mp) {
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vp = mp->vtob[hc];
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while (vp && vp->vaddr != a)
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vp = vp->next;
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}
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if (!vp)
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panic("sym: VTOBUS FAILED!\n");
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b = vp->baddr + (m - a);
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spin_unlock_irqrestore(&sym53c8xx_lock, flags);
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return b;
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}
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