1 files changed, 385 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..208e5b59e830
--- /dev/null
+++ b/drivers/media/dvb/firewire/firedtv-fw.c
@@ -0,0 +1,385 @@
+/*
+ * 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/highmem.h>
+#include <linux/kernel.h>
+#include <linux/list.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, size_t len)
+{
+        return node_req(fdtv, addr, data, len, len == 4 ?
+                        TCODE_READ_QUADLET_REQUEST : TCODE_READ_BLOCK_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 *packets[N_PACKETS];
+};
+
+static int queue_iso(struct firedtv_receive_context *ctx, int index)
+{
+        struct fw_iso_packet p;
+        int err;
+
+        p.payload_length = MAX_PACKET_SIZE;
+        p.interrupt = !(ctx->interrupt_packet & (IRQ_INTERVAL - 1));
+        p.skip = 0;
+        p.header_length = ISO_HEADER_SIZE;
+
+        err = fw_iso_context_queue(ctx->context, &p, &ctx->buffer,
+                                   index * MAX_PACKET_SIZE);
+        if (!err)
+                ctx->interrupt_packet++;
+
+        return err;
+}
+
+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 i = ctx->current_packet, length, err;
+        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->packets[i];
+                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);
+        char *p;
+        int i, j, k, 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 = 1;
+        ctx->current_packet = 0;
+
+        for (i = 0, k = 0; k < N_PAGES; k++) {
+                p = kmap(ctx->buffer.pages[k]);
+                for (j = 0; j < PACKETS_PER_PAGE && i < N_PACKETS; j++, i++)
+                        ctx->packets[i] = p + j * MAX_PACKET_SIZE;
+        }
+
+        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);
+}