Merge with Linux 2.3.40.

1 files changed, 514 insertions, 0 deletions

diff --git a/drivers/ieee1394/ieee1394_transactions.c b/drivers/ieee1394/ieee1394_transactions.c
new file mode 100644
index 000000000..c50bce62a
--- /dev/null
+++ b/drivers/ieee1394/ieee1394_transactions.c
@@ -0,0 +1,514 @@
+/*
+ * IEEE 1394 for Linux
+ *
+ * Transaction support.
+ *
+ * Copyright (C) 1999 Andreas E. Bombe
+ */
+
+#include <linux/sched.h>
+#include <asm/errno.h>
+#include <asm/bitops.h>
+
+#include "ieee1394.h"
+#include "ieee1394_types.h"
+#include "hosts.h"
+#include "ieee1394_core.h"
+#include "highlevel.h"
+
+
+#define PREP_ASYNC_HEAD_ADDRESS(tc) \
+        packet->tcode = tc; \
+        packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
+                | (1 << 8) | (tc << 4); \
+        packet->header[1] = (packet->host->node_id << 16) | (addr >> 32); \
+        packet->header[2] = addr & 0xffffffff
+
+#define PREP_ASYNC_HEAD_RCODE(tc) \
+        packet->tcode = tc; \
+        packet->header[0] = (packet->node_id << 16) | (packet->tlabel << 10) \
+                | (1 << 8) | (tc << 4); \
+        packet->header[1] = (packet->host->node_id << 16) | (rcode << 12); \
+        packet->header[2] = 0
+
+
+void fill_async_readquad(struct hpsb_packet *packet, u64 addr)
+{
+        PREP_ASYNC_HEAD_ADDRESS(TCODE_READQ);
+        packet->header_size = 12;
+        packet->data_size = 0;
+        packet->expect_response = 1;
+}
+
+void fill_async_readquad_resp(struct hpsb_packet *packet, int rcode, 
+                              quadlet_t data)
+{
+        PREP_ASYNC_HEAD_RCODE(TCODE_READQ_RESPONSE);
+        packet->header[3] = data;
+        packet->header_size = 16;
+        packet->data_size = 0;
+}
+
+void fill_async_readblock(struct hpsb_packet *packet, u64 addr, int length)
+{
+        PREP_ASYNC_HEAD_ADDRESS(TCODE_READB);
+        packet->header[3] = length << 16;
+        packet->header_size = 16;
+        packet->data_size = 0;
+        packet->expect_response = 1;
+}
+
+void fill_async_readblock_resp(struct hpsb_packet *packet, int rcode, 
+                               int length)
+{
+        if (rcode != RCODE_COMPLETE) {
+                length = 0;
+        }
+
+        PREP_ASYNC_HEAD_RCODE(TCODE_READB_RESPONSE);
+        packet->header[3] = length << 16;
+        packet->header_size = 16;
+        packet->data_size = length;
+}
+
+void fill_async_writequad(struct hpsb_packet *packet, u64 addr, quadlet_t data)
+{
+        PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEQ);
+        packet->header[3] = data;
+        packet->header_size = 16;
+        packet->data_size = 0;
+        packet->expect_response = 1;
+}
+
+void fill_async_writeblock(struct hpsb_packet *packet, u64 addr, int length)
+{
+        PREP_ASYNC_HEAD_ADDRESS(TCODE_WRITEB);
+        packet->header[3] = length << 16;
+        packet->header_size = 16;
+        packet->data_size = length;
+        packet->expect_response = 1;
+}
+
+void fill_async_write_resp(struct hpsb_packet *packet, int rcode)
+{
+        PREP_ASYNC_HEAD_RCODE(TCODE_WRITE_RESPONSE);
+        packet->header[2] = 0;
+        packet->header_size = 12;
+        packet->data_size = 0;
+}
+
+void fill_async_lock(struct hpsb_packet *packet, u64 addr, int extcode, 
+                     int length)
+{
+        PREP_ASYNC_HEAD_ADDRESS(TCODE_LOCK_REQUEST);
+        packet->header[3] = (length << 16) | extcode;
+        packet->header_size = 16;
+        packet->data_size = length;
+        packet->expect_response = 1;
+}
+
+void fill_async_lock_resp(struct hpsb_packet *packet, int rcode, int extcode, 
+                          int length)
+{
+        if (rcode != RCODE_COMPLETE) {
+                length = 0;
+        }
+
+        PREP_ASYNC_HEAD_RCODE(TCODE_LOCK_RESPONSE);
+        packet->header[3] = (length << 16) | extcode;
+        packet->header_size = 16;
+        packet->data_size = length;
+}
+
+void fill_iso_packet(struct hpsb_packet *packet, int length, int channel,
+                     int tag, int sync)
+{
+        packet->header[0] = (length << 16) | (tag << 14) | (channel << 8)
+                | (TCODE_ISO_DATA << 4) | sync;
+
+        packet->header_size = 4;
+        packet->data_size = length;
+        packet->tcode = TCODE_ISO_DATA;
+}
+
+
+int get_tlabel(struct hpsb_host *host, nodeid_t nodeid, int wait)
+{
+        unsigned long flags;
+        int tlabel;
+
+        while (1) {
+                spin_lock_irqsave(&host->tlabel_lock, flags);
+
+                if (host->tlabel_count) {
+                        host->tlabel_count--;
+
+                        if (host->tlabel_pool[0] != ~0) {
+                                tlabel = ffz(host->tlabel_pool[0]);
+                                host->tlabel_pool[0] |= 1 << tlabel;
+                        } else {
+                                tlabel = ffz(host->tlabel_pool[1]);
+                                host->tlabel_pool[1] |= 1 << tlabel;
+                                tlabel += 32;
+                        }
+                
+                        spin_unlock_irqrestore(&host->tlabel_lock, flags);
+                        return tlabel;
+                }
+
+                spin_unlock_irqrestore(&host->tlabel_lock, flags);
+
+                if (wait) {
+                        sleep_on(&host->tlabel_wait);
+                } else {
+                        return -1;
+                }
+        }
+}
+
+void free_tlabel(struct hpsb_host *host, nodeid_t nodeid, int tlabel)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&host->tlabel_lock, flags);
+
+        if (tlabel < 32) {
+                host->tlabel_pool[0] &= ~(1 << tlabel);
+        } else {
+                host->tlabel_pool[1] &= ~(1 << (tlabel-32));
+        }
+
+        host->tlabel_count++;
+
+        spin_unlock_irqrestore(&host->tlabel_lock, flags);
+
+        wake_up(&host->tlabel_wait);
+}
+
+
+
+int hpsb_packet_success(struct hpsb_packet *packet)
+{
+        switch (packet->ack_code) {
+        case ACK_PENDING:
+                switch ((packet->header[1] >> 12) & 0xf) {
+                case RCODE_COMPLETE:
+                        return 0;
+                case RCODE_CONFLICT_ERROR:
+                        return -EAGAIN;
+                case RCODE_DATA_ERROR:
+                        return -EREMOTEIO;
+                case RCODE_TYPE_ERROR:
+                        return -EACCES;
+                case RCODE_ADDRESS_ERROR:
+                        return -EINVAL;
+                default:
+                        HPSB_ERR("received reserved rcode %d from node %d",
+                                 (packet->header[1] >> 12) & 0xf, 
+                                 packet->node_id);
+                        return -EAGAIN;
+                }
+                HPSB_PANIC("reached unreachable code 1 in " __FUNCTION__);
+
+        case ACK_BUSY_X:
+        case ACK_BUSY_A:
+        case ACK_BUSY_B:
+                return -EBUSY;
+
+        case ACK_TYPE_ERROR:
+                return -EACCES;
+
+        case ACK_COMPLETE:
+                if (packet->tcode == TCODE_WRITEQ
+                    || packet->tcode == TCODE_WRITEB) {
+                        return 0;
+                } else {
+                        HPSB_ERR("impossible ack_complete from node %d "
+                                 "(tcode %d)", packet->node_id, packet->tcode);
+                        return -EAGAIN;
+                }
+
+
+        case ACK_DATA_ERROR:
+                if (packet->tcode == TCODE_WRITEB
+                    || packet->tcode == TCODE_LOCK_REQUEST) {
+                        return -EAGAIN;
+                } else {
+                        HPSB_ERR("impossible ack_data_error from node %d "
+                                 "(tcode %d)", packet->node_id, packet->tcode);
+                        return -EAGAIN;
+                }
+
+        case ACKX_NONE:
+        case ACKX_SEND_ERROR:
+        case ACKX_ABORTED:
+        case ACKX_TIMEOUT:
+                /* error while sending */
+                return -EAGAIN;
+
+        default:
+                HPSB_ERR("got invalid ack %d from node %d (tcode %d)",
+                         packet->ack_code, packet->node_id, packet->tcode);
+                return -EAGAIN;
+        }
+
+        HPSB_PANIC("reached unreachable code 2 in " __FUNCTION__);
+}
+
+
+int hpsb_read_trylocal(struct hpsb_host *host, nodeid_t node, u64 addr, 
+                       quadlet_t *buffer, size_t length)
+{
+        if (host->node_id != node) return -1;
+        return highlevel_read(host, buffer, addr, length);
+}
+
+struct hpsb_packet *hpsb_make_readqpacket(struct hpsb_host *host, nodeid_t node,
+                                          u64 addr)
+{
+        struct hpsb_packet *p;
+
+        p = alloc_hpsb_packet(0);
+        if (!p) return NULL;
+
+        p->host = host;
+        p->tlabel = get_tlabel(host, node, 1);
+        p->node_id = node;
+        fill_async_readquad(p, addr);
+
+        return p;
+}
+
+struct hpsb_packet *hpsb_make_readbpacket(struct hpsb_host *host, nodeid_t node,
+                                          u64 addr, size_t length)
+{
+        struct hpsb_packet *p;
+
+        p = alloc_hpsb_packet(length);
+        if (!p) return NULL;
+
+        p->host = host;
+        p->tlabel = get_tlabel(host, node, 1);
+        p->node_id = node;
+        fill_async_readblock(p, addr, length);
+
+        return p;
+}
+
+struct hpsb_packet *hpsb_make_writeqpacket(struct hpsb_host *host,
+                                           nodeid_t node, u64 addr,
+                                           quadlet_t data)
+{
+        struct hpsb_packet *p;
+
+        p = alloc_hpsb_packet(0);
+        if (!p) return NULL;
+
+        p->host = host;
+        p->tlabel = get_tlabel(host, node, 1);
+        p->node_id = node;
+        fill_async_writequad(p, addr, data);
+
+        return p;
+}
+
+struct hpsb_packet *hpsb_make_writebpacket(struct hpsb_host *host,
+                                           nodeid_t node, u64 addr,
+                                           size_t length)
+{
+        struct hpsb_packet *p;
+
+        p = alloc_hpsb_packet(length);
+        if (!p) return NULL;
+
+        p->host = host;
+        p->tlabel = get_tlabel(host, node, 1);
+        p->node_id = node;
+        fill_async_writeblock(p, addr, length);
+
+        return p;
+}
+
+
+/*
+ * FIXME - these functions should probably read from / write to user space to
+ * avoid in kernel buffers for user space callers
+ */
+
+int hpsb_read(struct hpsb_host *host, nodeid_t node, u64 addr,
+              quadlet_t *buffer, size_t length)
+{
+        struct hpsb_packet *packet;
+        int retval = 0;
+        
+        if (length == 0) {
+                return -EINVAL;
+        }
+
+        if (host->node_id == node) {
+                switch(highlevel_read(host, buffer, addr, length)) {
+                case RCODE_COMPLETE:
+                        return 0;
+                case RCODE_TYPE_ERROR:
+                        return -EACCES;
+                case RCODE_ADDRESS_ERROR:
+                default:
+                        return -EINVAL;
+                }
+        }
+
+        if (length & 0x3) {
+                /* FIXME: Lengths not multiple of 4 are not implemented.  Mainly
+                 * there is the problem with little endian machines because we
+                 * always swap to little endian on receive.  If we read 5 bytes
+                 * 12345 we receive them as 12345000 and swap them to 43210005.
+                 * How should we copy that to the caller?  Require *buffer to be
+                 * a full quadlet multiple in length? */
+                return -EACCES;
+        }
+
+        if (length == 4) {
+                packet = hpsb_make_readqpacket(host, node, addr);
+        } else {
+                packet = hpsb_make_readbpacket(host, node, addr, length);
+        }
+
+        if (!packet) {
+                return -ENOMEM;
+        }
+
+        hpsb_send_packet(packet);
+        down(&packet->state_change);
+        down(&packet->state_change);
+        retval = hpsb_packet_success(packet);
+
+        if (retval == 0) {
+                if (length == 4) {
+                        *buffer = packet->header[3];
+                } else {
+                        memcpy(buffer, packet->data, length);
+                }
+        }
+
+        free_tlabel(host, node, packet->tlabel);
+        free_hpsb_packet(packet);
+
+        return retval;
+}
+
+
+int hpsb_write(struct hpsb_host *host, nodeid_t node, u64 addr,
+               quadlet_t *buffer, size_t length)
+{
+        struct hpsb_packet *packet;
+        int retval = 0;
+        
+        if (length == 0) {
+                return -EINVAL;
+        }
+
+        if (host->node_id == node) {
+                switch(highlevel_write(host, buffer, addr, length)) {
+                case RCODE_COMPLETE:
+                        return 0;
+                case RCODE_TYPE_ERROR:
+                        return -EACCES;
+                case RCODE_ADDRESS_ERROR:
+                default:
+                        return -EINVAL;
+                }
+        }
+
+        if (length & 0x3) {
+                /* FIXME: Lengths not multiple of 4 are not implemented.  See function
+                 * hpsb_read for explanation, same reason, different direction. */
+                return -EACCES;
+        }
+
+        if (length == 4) {
+                packet = hpsb_make_writeqpacket(host, node, addr, *buffer);
+        } else {
+                packet = hpsb_make_writebpacket(host, node, addr, length);
+        }
+
+        if (!packet) {
+                return -ENOMEM;
+        }
+
+        if (length != 4) {
+                memcpy(packet->data, buffer, length);
+        }
+
+        hpsb_send_packet(packet);
+        down(&packet->state_change);
+        down(&packet->state_change);
+        retval = hpsb_packet_success(packet);
+
+        free_tlabel(host, node, packet->tlabel);
+        free_hpsb_packet(packet);
+
+        return retval;
+}
+
+
+/* We need a hpsb_lock64 function for the 64 bit equivalent.  Probably. */
+int hpsb_lock(struct hpsb_host *host, nodeid_t node, u64 addr, int extcode,
+              quadlet_t *data, quadlet_t arg)
+{
+        struct hpsb_packet *packet;
+        int retval = 0, length;
+        
+        if (host->node_id == node) {
+                switch(highlevel_lock(host, data, addr, *data, arg, extcode)) {
+                case RCODE_COMPLETE:
+                        return 0;
+                case RCODE_TYPE_ERROR:
+                        return -EACCES;
+                case RCODE_ADDRESS_ERROR:
+                default:
+                        return -EINVAL;
+                }
+        }
+
+        packet = alloc_hpsb_packet(8);
+        if (!packet) {
+                return -ENOMEM;
+        }
+
+        packet->host = host;
+        packet->tlabel = get_tlabel(host, node, 1);
+        packet->node_id = node;
+
+        switch (extcode) {
+        case EXTCODE_MASK_SWAP:
+        case EXTCODE_COMPARE_SWAP:
+        case EXTCODE_BOUNDED_ADD:
+        case EXTCODE_WRAP_ADD:
+                length = 8;
+                packet->data[0] = arg;
+                packet->data[1] = *data;
+                break;
+        case EXTCODE_FETCH_ADD:
+        case EXTCODE_LITTLE_ADD:
+                length = 4;
+                packet->data[0] = *data;
+                break;
+        default:
+                return -EINVAL;
+        }
+        fill_async_lock(packet, addr, extcode, length);
+
+        hpsb_send_packet(packet);
+        down(&packet->state_change);
+        down(&packet->state_change);
+        retval = hpsb_packet_success(packet);
+
+        if (retval == 0) {
+                *data = packet->data[0];
+        }
+
+        free_tlabel(host, node, packet->tlabel);
+        free_hpsb_packet(packet);
+
+        return retval;
+}