1 files changed, 382 insertions, 0 deletions

diff --git a/drivers/scsi/sym53c8xx_2/sym_malloc.c b/drivers/scsi/sym53c8xx_2/sym_malloc.c
new file mode 100644
index 000000000000..a34d403ccc6c
--- /dev/null
+++ b/drivers/scsi/sym53c8xx_2/sym_malloc.c
@@ -0,0 +1,382 @@
+/*
+ * 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>
+ *
+ *-----------------------------------------------------------------------------
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef __FreeBSD__
+#include <dev/sym/sym_glue.h>
+#else
+#include "sym_glue.h"
+#endif
+
+/*
+ *  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 developped 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;
+}