1 files changed, 376 insertions, 0 deletions
diff --git a/drivers/media/dvb/firewire/firedtv-fw.c b/drivers/media/dvb/firewire/firedtv-fw.c
new file mode 100644
index 000000000000..fe44789ab037
--- /dev/null
+++ b/drivers/media/dvb/firewire/firedtv-fw.c
@@ -0,0 +1,376 @@
+/*
+ * FireDTV driver -- firewire I/O backend
+ */
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/firewire.h>
+#include <linux/firewire-constants.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+
+#include <asm/page.h>
+
+#include <dvb_demux.h>
+
+#include "firedtv.h"
+
+static LIST_HEAD(node_list);
+static DEFINE_SPINLOCK(node_list_lock);
+
+static inline struct fw_device *device_of(struct firedtv *fdtv)
+{
+	return fw_device(fdtv->device->parent);
+}
+
+static int node_req(struct firedtv *fdtv, u64 addr, void *data, size_t len,
+		    int tcode)
+{
+	struct fw_device *device = device_of(fdtv);
+	int rcode, generation = device->generation;
+
+	smp_rmb(); /* node_id vs. generation */
+
+	rcode = fw_run_transaction(device->card, tcode, device->node_id,
+			generation, device->max_speed, addr, data, len);
+
+	return rcode != RCODE_COMPLETE ? -EIO : 0;
+}
+
+static int node_lock(struct firedtv *fdtv, u64 addr, __be32 data[])
+{
+	return node_req(fdtv, addr, data, 8, TCODE_LOCK_COMPARE_SWAP);
+}
+
+static int node_read(struct firedtv *fdtv, u64 addr, void *data)
+{
+	return node_req(fdtv, addr, data, 4, TCODE_READ_QUADLET_REQUEST);
+}
+
+static int node_write(struct firedtv *fdtv, u64 addr, void *data, size_t len)
+{
+	return node_req(fdtv, addr, data, len, TCODE_WRITE_BLOCK_REQUEST);
+}
+
+#define ISO_HEADER_SIZE			4
+#define CIP_HEADER_SIZE			8
+#define MPEG2_TS_HEADER_SIZE		4
+#define MPEG2_TS_SOURCE_PACKET_SIZE	(4 + 188)
+
+#define MAX_PACKET_SIZE		1024  /* 776, rounded up to 2^n */
+#define PACKETS_PER_PAGE	(PAGE_SIZE / MAX_PACKET_SIZE)
+#define N_PACKETS		64    /* buffer size */
+#define N_PAGES			DIV_ROUND_UP(N_PACKETS, PACKETS_PER_PAGE)
+#define IRQ_INTERVAL		16
+
+struct firedtv_receive_context {
+	struct fw_iso_context *context;
+	struct fw_iso_buffer buffer;
+	int interrupt_packet;
+	int current_packet;
+	char *pages[N_PAGES];
+};
+
+static int queue_iso(struct firedtv_receive_context *ctx, int index)
+{
+	struct fw_iso_packet p;
+
+	p.payload_length = MAX_PACKET_SIZE;
+	p.interrupt = !(++ctx->interrupt_packet & (IRQ_INTERVAL - 1));
+	p.skip = 0;
+	p.header_length = ISO_HEADER_SIZE;
+
+	return fw_iso_context_queue(ctx->context, &p, &ctx->buffer,
+				    index * MAX_PACKET_SIZE);
+}
+
+static void handle_iso(struct fw_iso_context *context, u32 cycle,
+		       size_t header_length, void *header, void *data)
+{
+	struct firedtv *fdtv = data;
+	struct firedtv_receive_context *ctx = fdtv->backend_data;
+	__be32 *h, *h_end;
+	int length, err, i = ctx->current_packet;
+	char *p, *p_end;
+
+	for (h = header, h_end = h + header_length / 4; h < h_end; h++) {
+		length = be32_to_cpup(h) >> 16;
+		if (unlikely(length > MAX_PACKET_SIZE)) {
+			dev_err(fdtv->device, "length = %d\n", length);
+			length = MAX_PACKET_SIZE;
+		}
+
+		p = ctx->pages[i / PACKETS_PER_PAGE]
+				+ (i % PACKETS_PER_PAGE) * MAX_PACKET_SIZE;
+		p_end = p + length;
+
+		for (p += CIP_HEADER_SIZE + MPEG2_TS_HEADER_SIZE; p < p_end;
+		     p += MPEG2_TS_SOURCE_PACKET_SIZE)
+			dvb_dmx_swfilter_packets(&fdtv->demux, p, 1);
+
+		err = queue_iso(ctx, i);
+		if (unlikely(err))
+			dev_err(fdtv->device, "requeue failed\n");
+
+		i = (i + 1) & (N_PACKETS - 1);
+	}
+	ctx->current_packet = i;
+}
+
+static int start_iso(struct firedtv *fdtv)
+{
+	struct firedtv_receive_context *ctx;
+	struct fw_device *device = device_of(fdtv);
+	int i, err;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->context = fw_iso_context_create(device->card,
+			FW_ISO_CONTEXT_RECEIVE, fdtv->isochannel,
+			device->max_speed, ISO_HEADER_SIZE, handle_iso, fdtv);
+	if (IS_ERR(ctx->context)) {
+		err = PTR_ERR(ctx->context);
+		goto fail_free;
+	}
+
+	err = fw_iso_buffer_init(&ctx->buffer, device->card,
+				 N_PAGES, DMA_FROM_DEVICE);
+	if (err)
+		goto fail_context_destroy;
+
+	ctx->interrupt_packet = 0;
+	ctx->current_packet = 0;
+
+	for (i = 0; i < N_PAGES; i++)
+		ctx->pages[i] = page_address(ctx->buffer.pages[i]);
+
+	for (i = 0; i < N_PACKETS; i++) {
+		err = queue_iso(ctx, i);
+		if (err)
+			goto fail;
+	}
+
+	err = fw_iso_context_start(ctx->context, -1, 0,
+				   FW_ISO_CONTEXT_MATCH_ALL_TAGS);
+	if (err)
+		goto fail;
+
+	fdtv->backend_data = ctx;
+
+	return 0;
+fail:
+	fw_iso_buffer_destroy(&ctx->buffer, device->card);
+fail_context_destroy:
+	fw_iso_context_destroy(ctx->context);
+fail_free:
+	kfree(ctx);
+
+	return err;
+}
+
+static void stop_iso(struct firedtv *fdtv)
+{
+	struct firedtv_receive_context *ctx = fdtv->backend_data;
+
+	fw_iso_context_stop(ctx->context);
+	fw_iso_buffer_destroy(&ctx->buffer, device_of(fdtv)->card);
+	fw_iso_context_destroy(ctx->context);
+	kfree(ctx);
+}
+
+static const struct firedtv_backend backend = {
+	.lock		= node_lock,
+	.read		= node_read,
+	.write		= node_write,
+	.start_iso	= start_iso,
+	.stop_iso	= stop_iso,
+};
+
+static void handle_fcp(struct fw_card *card, struct fw_request *request,
+		       int tcode, int destination, int source, int generation,
+		       int speed, unsigned long long offset,
+		       void *payload, size_t length, void *callback_data)
+{
+	struct firedtv *f, *fdtv = NULL;
+	struct fw_device *device;
+	unsigned long flags;
+	int su;
+
+	if ((tcode != TCODE_WRITE_QUADLET_REQUEST &&
+	     tcode != TCODE_WRITE_BLOCK_REQUEST) ||
+	    offset != CSR_REGISTER_BASE + CSR_FCP_RESPONSE ||
+	    length == 0 ||
+	    (((u8 *)payload)[0] & 0xf0) != 0) {
+		fw_send_response(card, request, RCODE_TYPE_ERROR);
+		return;
+	}
+
+	su = ((u8 *)payload)[1] & 0x7;
+
+	spin_lock_irqsave(&node_list_lock, flags);
+	list_for_each_entry(f, &node_list, list) {
+		device = device_of(f);
+		if (device->generation != generation)
+			continue;
+
+		smp_rmb(); /* node_id vs. generation */
+
+		if (device->card == card &&
+		    device->node_id == source &&
+		    (f->subunit == su || (f->subunit == 0 && su == 0x7))) {
+			fdtv = f;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&node_list_lock, flags);
+
+	if (fdtv) {
+		avc_recv(fdtv, payload, length);
+		fw_send_response(card, request, RCODE_COMPLETE);
+	}
+}
+
+static struct fw_address_handler fcp_handler = {
+	.length           = CSR_FCP_END - CSR_FCP_RESPONSE,
+	.address_callback = handle_fcp,
+};
+
+static const struct fw_address_region fcp_region = {
+	.start	= CSR_REGISTER_BASE + CSR_FCP_RESPONSE,
+	.end	= CSR_REGISTER_BASE + CSR_FCP_END,
+};
+
+/* Adjust the template string if models with longer names appear. */
+#define MAX_MODEL_NAME_LEN ((int)DIV_ROUND_UP(sizeof("FireDTV ????"), 4))
+
+static size_t model_name(u32 *directory, __be32 *buffer)
+{
+	struct fw_csr_iterator ci;
+	int i, length, key, value, last_key = 0;
+	u32 *block = NULL;
+
+	fw_csr_iterator_init(&ci, directory);
+	while (fw_csr_iterator_next(&ci, &key, &value)) {
+		if (last_key == CSR_MODEL &&
+		    key == (CSR_DESCRIPTOR | CSR_LEAF))
+			block = ci.p - 1 + value;
+		last_key = key;
+	}
+
+	if (block == NULL)
+		return 0;
+
+	length = min((int)(block[0] >> 16) - 2, MAX_MODEL_NAME_LEN);
+	if (length <= 0)
+		return 0;
+
+	/* fast-forward to text string */
+	block += 3;
+
+	for (i = 0; i < length; i++)
+		buffer[i] = cpu_to_be32(block[i]);
+
+	return length * 4;
+}
+
+static int node_probe(struct device *dev)
+{
+	struct firedtv *fdtv;
+	__be32 name[MAX_MODEL_NAME_LEN];
+	int name_len, err;
+
+	name_len = model_name(fw_unit(dev)->directory, name);
+
+	fdtv = fdtv_alloc(dev, &backend, (char *)name, name_len);
+	if (!fdtv)
+		return -ENOMEM;
+
+	err = fdtv_register_rc(fdtv, dev);
+	if (err)
+		goto fail_free;
+
+	spin_lock_irq(&node_list_lock);
+	list_add_tail(&fdtv->list, &node_list);
+	spin_unlock_irq(&node_list_lock);
+
+	err = avc_identify_subunit(fdtv);
+	if (err)
+		goto fail;
+
+	err = fdtv_dvb_register(fdtv);
+	if (err)
+		goto fail;
+
+	avc_register_remote_control(fdtv);
+
+	return 0;
+fail:
+	spin_lock_irq(&node_list_lock);
+	list_del(&fdtv->list);
+	spin_unlock_irq(&node_list_lock);
+	fdtv_unregister_rc(fdtv);
+fail_free:
+	kfree(fdtv);
+
+	return err;
+}
+
+static int node_remove(struct device *dev)
+{
+	struct firedtv *fdtv = dev_get_drvdata(dev);
+
+	fdtv_dvb_unregister(fdtv);
+
+	spin_lock_irq(&node_list_lock);
+	list_del(&fdtv->list);
+	spin_unlock_irq(&node_list_lock);
+
+	fdtv_unregister_rc(fdtv);
+
+	kfree(fdtv);
+	return 0;
+}
+
+static void node_update(struct fw_unit *unit)
+{
+	struct firedtv *fdtv = dev_get_drvdata(&unit->device);
+
+	if (fdtv->isochannel >= 0)
+		cmp_establish_pp_connection(fdtv, fdtv->subunit,
+					    fdtv->isochannel);
+}
+
+static struct fw_driver fdtv_driver = {
+	.driver   = {
+		.owner  = THIS_MODULE,
+		.name   = "firedtv",
+		.bus    = &fw_bus_type,
+		.probe  = node_probe,
+		.remove = node_remove,
+	},
+	.update   = node_update,
+	.id_table = fdtv_id_table,
+};
+
+int __init fdtv_fw_init(void)
+{
+	int ret;
+
+	ret = fw_core_add_address_handler(&fcp_handler, &fcp_region);
+	if (ret < 0)
+		return ret;
+
+	return driver_register(&fdtv_driver.driver);
+}
+
+void fdtv_fw_exit(void)
+{
+	driver_unregister(&fdtv_driver.driver);
+	fw_core_remove_address_handler(&fcp_handler);
+}