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firewire: Handle access to CSR resources on local node.

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Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-01-26 00:38:26 -05:00 committed by Stefan Richter
parent 746083d86c
commit 93c4cceb96
3 changed files with 154 additions and 21 deletions
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130
drivers/firewire/fw-ohci.c
View File

@ -540,38 +540,136 @@ at_context_init(struct at_context *ctx, struct fw_ohci *ohci, u32 control_set)
}
#define header_get_destination(q) (((q) >> 16) & 0xffff)
#define header_get_tcode(q) (((q) >> 4) & 0x0f)
#define header_get_offset_high(q) (((q) >> 0) & 0xffff)
#define header_get_data_length(q) (((q) >> 16) & 0xffff)
#define header_get_extended_tcode(q) (((q) >> 0) & 0xffff)
static void
handle_local_rom(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
{
struct fw_packet response;
int tcode, length, i;
tcode = header_get_tcode(packet->header[0]);
if (TCODE_IS_BLOCK_PACKET(tcode))
length = header_get_data_length(packet->header[3]);
else
length = 4;
i = csr - CSR_CONFIG_ROM;
if (i + length > CONFIG_ROM_SIZE) {
fw_fill_response(&response, packet->header,
RCODE_ADDRESS_ERROR, NULL, 0);
} else if (!TCODE_IS_READ_REQUEST(tcode)) {
fw_fill_response(&response, packet->header,
RCODE_TYPE_ERROR, NULL, 0);
} else {
fw_fill_response(&response, packet->header, RCODE_COMPLETE,
(void *) ohci->config_rom + i, length);
}
fw_core_handle_response(&ohci->card, &response);
}
static void
handle_local_lock(struct fw_ohci *ohci, struct fw_packet *packet, u32 csr)
{
struct fw_packet response;
int tcode, length, ext_tcode, sel;
__be32 *payload, lock_old;
u32 lock_arg, lock_data;
tcode = header_get_tcode(packet->header[0]);
length = header_get_data_length(packet->header[3]);
payload = packet->payload;
ext_tcode = header_get_extended_tcode(packet->header[3]);
if (tcode == TCODE_LOCK_REQUEST &&
ext_tcode == EXTCODE_COMPARE_SWAP && length == 8) {
lock_arg = be32_to_cpu(payload[0]);
lock_data = be32_to_cpu(payload[1]);
} else if (tcode == TCODE_READ_QUADLET_REQUEST) {
lock_arg = 0;
lock_data = 0;
} else {
fw_fill_response(&response, packet->header,
RCODE_TYPE_ERROR, NULL, 0);
goto out;
}
sel = (csr - CSR_BUS_MANAGER_ID) / 4;
reg_write(ohci, OHCI1394_CSRData, lock_data);
reg_write(ohci, OHCI1394_CSRCompareData, lock_arg);
reg_write(ohci, OHCI1394_CSRControl, sel);
if (reg_read(ohci, OHCI1394_CSRControl) & 0x80000000)
lock_old = cpu_to_be32(reg_read(ohci, OHCI1394_CSRData));
else
fw_notify("swap not done yet\n");
fw_fill_response(&response, packet->header,
RCODE_COMPLETE, &lock_old, sizeof lock_old);
out:
fw_core_handle_response(&ohci->card, &response);
}
static void
handle_local_request(struct at_context *ctx, struct fw_packet *packet)
{
u64 offset;
u32 csr;
packet->ack = ACK_PENDING;
packet->callback(packet, &ctx->ohci->card, packet->ack);
offset =
((unsigned long long)
header_get_offset_high(packet->header[1]) << 32) |
packet->header[2];
csr = offset - CSR_REGISTER_BASE;
/* Handle config rom reads. */
if (csr >= CSR_CONFIG_ROM && csr < CSR_CONFIG_ROM_END)
handle_local_rom(ctx->ohci, packet, csr);
else switch (csr) {
case CSR_BUS_MANAGER_ID:
case CSR_BANDWIDTH_AVAILABLE:
case CSR_CHANNELS_AVAILABLE_HI:
case CSR_CHANNELS_AVAILABLE_LO:
handle_local_lock(ctx->ohci, packet, csr);
break;
default:
if (ctx == &ctx->ohci->at_request_ctx)
fw_core_handle_request(&ctx->ohci->card, packet);
else
fw_core_handle_response(&ctx->ohci->card, packet);
break;
}
}
static void
at_context_transmit(struct at_context *ctx, struct fw_packet *packet)
{
LIST_HEAD(list);
unsigned long flags;
int local;
spin_lock_irqsave(&ctx->ohci->lock, flags);
if (header_get_destination(packet->header[0]) == ctx->ohci->node_id &&
ctx->ohci->generation == packet->generation) {
local = 1;
} else {
list_add_tail(&packet->link, &ctx->list);
if (ctx->list.next == &packet->link)
at_context_setup_packet(ctx, &list);
local = 0;
spin_unlock_irqrestore(&ctx->ohci->lock, flags);
handle_local_request(ctx, packet);
return;
}
list_add_tail(&packet->link, &ctx->list);
if (ctx->list.next == &packet->link)
at_context_setup_packet(ctx, &list);
spin_unlock_irqrestore(&ctx->ohci->lock, flags);
do_packet_callbacks(ctx->ohci, &list);
if (local) {
packet->ack = ACK_PENDING;
packet->callback(packet, &ctx->ohci->card, packet->ack);
if (ctx == &ctx->ohci->at_request_ctx)
fw_core_handle_request(&ctx->ohci->card, packet);
else
fw_core_handle_response(&ctx->ohci->card, packet);
}
}
static void bus_reset_tasklet(unsigned long data)

14
drivers/firewire/fw-transaction.c
View File

@ -425,7 +425,7 @@ free_response_callback(struct fw_packet *packet,
kfree(request);
}
static void
void
fw_fill_response(struct fw_packet *response, u32 *request_header,
int rcode, void *payload, size_t length)
{
@ -457,7 +457,10 @@ fw_fill_response(struct fw_packet *response, u32 *request_header,
case TCODE_READ_QUADLET_REQUEST:
response->header[0] |=
header_tcode(TCODE_READ_QUADLET_RESPONSE);
response->header[3] = *(u32 *)payload;
if (payload != NULL)
response->header[3] = *(u32 *)payload;
else
response->header[3] = 0;
response->header_length = 16;
response->payload_length = 0;
break;
@ -478,6 +481,7 @@ fw_fill_response(struct fw_packet *response, u32 *request_header,
return;
}
}
EXPORT_SYMBOL(fw_fill_response);
static struct fw_request *
allocate_request(struct fw_packet *p)
@ -529,9 +533,9 @@ allocate_request(struct fw_packet *p)
request->response.generation = p->generation;
request->response.callback = free_response_callback;
request->ack = p->ack;
request->length = p->payload_length;
request->length = length;
if (data)
memcpy(request->data, p->payload, p->payload_length);
memcpy(request->data, p->payload, length);
memcpy(request->request_header, p->header, sizeof p->header);
@ -656,7 +660,7 @@ fw_core_handle_response(struct fw_card *card, struct fw_packet *p)
case TCODE_READ_BLOCK_RESPONSE:
case TCODE_LOCK_RESPONSE:
data = &p->header[4];
data = p->payload;
data_length = header_get_data_length(p->header[3]);
break;

31
drivers/firewire/fw-transaction.h
View File

@ -40,6 +40,7 @@
#define TCODE_STREAM_DATA 10
#define TCODE_LOCK_RESPONSE 11
#define TCODE_IS_READ_REQUEST(tcode) (((tcode) & ~1) == 4)
#define TCODE_IS_BLOCK_PACKET(tcode) (((tcode) & 1) != 0)
#define TCODE_IS_REQUEST(tcode) (((tcode) & 2) == 0)
#define TCODE_IS_RESPONSE(tcode) (((tcode) & 2) != 0)
@ -103,6 +104,34 @@
#define PHY_PACKET_LINK_ON 0x1
#define PHY_PACKET_SELF_ID 0x2
#define CSR_REGISTER_BASE 0xfffff0000000ULL
/* register offsets relative to CSR_REGISTER_BASE */
#define CSR_STATE_CLEAR 0x0
#define CSR_STATE_SET 0x4
#define CSR_NODE_IDS 0x8
#define CSR_RESET_START 0xc
#define CSR_SPLIT_TIMEOUT_HI 0x18
#define CSR_SPLIT_TIMEOUT_LO 0x1c
#define CSR_CYCLE_TIME 0x200
#define CSR_BUS_TIME 0x204
#define CSR_BUSY_TIMEOUT 0x210
#define CSR_BUS_MANAGER_ID 0x21c
#define CSR_BANDWIDTH_AVAILABLE 0x220
#define CSR_CHANNELS_AVAILABLE 0x224
#define CSR_CHANNELS_AVAILABLE_HI 0x224
#define CSR_CHANNELS_AVAILABLE_LO 0x228
#define CSR_BROADCAST_CHANNEL 0x234
#define CSR_CONFIG_ROM 0x400
#define CSR_CONFIG_ROM_END 0x800
#define CSR_FCP_COMMAND 0xB00
#define CSR_FCP_RESPONSE 0xD00
#define CSR_FCP_END 0xF00
#define CSR_TOPOLOGY_MAP 0x1000
#define CSR_TOPOLOGY_MAP_END 0x1400
#define CSR_SPEED_MAP 0x2000
#define CSR_SPEED_MAP_END 0x3000
#define fw_notify(s, args...) printk(KERN_NOTICE KBUILD_MODNAME ": " s, ## args)
#define fw_error(s, args...) printk(KERN_ERR KBUILD_MODNAME ": " s, ## args)
#define fw_debug(s, args...) printk(KERN_DEBUG KBUILD_MODNAME ": " s, ## args)
@ -227,6 +256,8 @@ extern const struct fw_address_region fw_unit_space_region;
int fw_core_add_address_handler(struct fw_address_handler *handler,
const struct fw_address_region *region);
void fw_core_remove_address_handler(struct fw_address_handler *handler);
void fw_fill_response(struct fw_packet *response, u32 *request_header,
int rcode, void *payload, size_t length);
void fw_send_response(struct fw_card *card,
struct fw_request *request, int rcode);