#define RING_ENTRY_SIZE sizeof(struct dma64dd)
/* # entries in PDC dma ring */
-#define PDC_RING_ENTRIES 128
+#define PDC_RING_ENTRIES 512
+/*
+ * Minimum number of ring descriptor entries that must be free to tell mailbox
+ * framework that it can submit another request
+ */
+#define PDC_RING_SPACE_MIN 15
+
#define PDC_RING_SIZE (PDC_RING_ENTRIES * RING_ENTRY_SIZE)
/* Rings are 8k aligned */
#define RING_ALIGN_ORDER 13
* Interrupt mask and status definitions. Enable interrupts for tx and rx on
* ring 0
*/
-#define PDC_XMTINT_0 (24 + PDC_RINGSET)
#define PDC_RCVINT_0 (16 + PDC_RINGSET)
-#define PDC_XMTINTEN_0 BIT(PDC_XMTINT_0)
#define PDC_RCVINTEN_0 BIT(PDC_RCVINT_0)
-#define PDC_INTMASK (PDC_XMTINTEN_0 | PDC_RCVINTEN_0)
+#define PDC_INTMASK (PDC_RCVINTEN_0)
#define PDC_LAZY_FRAMECOUNT 1
#define PDC_LAZY_TIMEOUT 10000
#define PDC_LAZY_INT (PDC_LAZY_TIMEOUT | (PDC_LAZY_FRAMECOUNT << 24))
/*
* Sets the following bits for write to transmit control reg:
- * 0 - XmtEn - enable activity on the tx channel
* 11 - PtyChkDisable - parity check is disabled
* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory
*/
-#define PDC_TX_CTL 0x000C0801
+#define PDC_TX_CTL 0x000C0800
+
+/* Bit in tx control reg to enable tx channel */
+#define PDC_TX_ENABLE 0x1
/*
* Sets the following bits for write to receive control reg:
- * 0 - RcvEn - enable activity on the rx channel
* 7:1 - RcvOffset - size in bytes of status region at start of rx frame buf
* 9 - SepRxHdrDescEn - place start of new frames only in descriptors
* that have StartOfFrame set
* 11 - PtyChkDisable - parity check is disabled
* 20:18 - BurstLen = 3 -> 2^7 = 128 byte data reads from memory
*/
-#define PDC_RX_CTL 0x000C0E01
+#define PDC_RX_CTL 0x000C0E00
+
+/* Bit in rx control reg to enable rx channel */
+#define PDC_RX_ENABLE 0x1
#define CRYPTO_D64_RS0_CD_MASK ((PDC_RING_ENTRIES * RING_ENTRY_SIZE) - 1)
u32 size; /* ring allocation size in bytes */
};
+/*
+ * context associated with a receive descriptor.
+ * @rxp_ctx: opaque context associated with frame that starts at each
+ * rx ring index.
+ * @dst_sg: Scatterlist used to form reply frames beginning at a given ring
+ * index. Retained in order to unmap each sg after reply is processed.
+ * @rxin_numd: Number of rx descriptors associated with the message that starts
+ * at a descriptor index. Not set for every index. For example,
+ * if descriptor index i points to a scatterlist with 4 entries,
+ * then the next three descriptor indexes don't have a value set.
+ * @resp_hdr: Virtual address of buffer used to catch DMA rx status
+ * @resp_hdr_daddr: physical address of DMA rx status buffer
+ */
+struct pdc_rx_ctx {
+ void *rxp_ctx;
+ struct scatterlist *dst_sg;
+ u32 rxin_numd;
+ void *resp_hdr;
+ dma_addr_t resp_hdr_daddr;
+};
+
/* PDC state structure */
struct pdc_state {
- /* synchronize access to this PDC state structure */
- spinlock_t pdc_lock;
-
/* Index of the PDC whose state is in this structure instance */
u8 pdc_idx;
unsigned int pdc_irq;
- /*
- * Last interrupt status read from PDC device. Saved in interrupt
- * handler so the handler can clear the interrupt in the device,
- * and the interrupt thread called later can know which interrupt
- * bits are active.
- */
- unsigned long intstatus;
+ /* tasklet for deferred processing after DMA rx interrupt */
+ struct tasklet_struct rx_tasklet;
/* Number of bytes of receive status prior to each rx frame */
u32 rx_status_len;
/* Index of next rx descriptor to post. */
u32 rxout;
- /*
- * opaque context associated with frame that starts at each
- * rx ring index.
- */
- void *rxp_ctx[PDC_RING_ENTRIES];
+ struct pdc_rx_ctx rx_ctx[PDC_RING_ENTRIES];
/*
* Scatterlists used to form request and reply frames beginning at a
* is processed
*/
struct scatterlist *src_sg[PDC_RING_ENTRIES];
- struct scatterlist *dst_sg[PDC_RING_ENTRIES];
-
- /*
- * Number of rx descriptors associated with the message that starts
- * at this descriptor index. Not set for every index. For example,
- * if descriptor index i points to a scatterlist with 4 entries, then
- * the next three descriptor indexes don't have a value set.
- */
- u32 rxin_numd[PDC_RING_ENTRIES];
-
- void *resp_hdr[PDC_RING_ENTRIES];
- dma_addr_t resp_hdr_daddr[PDC_RING_ENTRIES];
struct dentry *debugfs_stats; /* debug FS stats file for this PDC */
/* counters */
- u32 pdc_requests; /* number of request messages submitted */
- u32 pdc_replies; /* number of reply messages received */
- u32 txnobuf; /* count of tx ring full */
- u32 rxnobuf; /* count of rx ring full */
- u32 rx_oflow; /* count of rx overflows */
+ u32 pdc_requests; /* number of request messages submitted */
+ u32 pdc_replies; /* number of reply messages received */
+ u32 last_tx_not_done; /* too few tx descriptors to indicate done */
+ u32 tx_ring_full; /* unable to accept msg because tx ring full */
+ u32 rx_ring_full; /* unable to accept msg because rx ring full */
+ u32 txnobuf; /* unable to create tx descriptor */
+ u32 rxnobuf; /* unable to create rx descriptor */
+ u32 rx_oflow; /* count of rx overflows */
};
/* Global variables */
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"SPU %u stats:\n", pdcs->pdc_idx);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
- "PDC requests............%u\n",
+ "PDC requests....................%u\n",
pdcs->pdc_requests);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
- "PDC responses...........%u\n",
+ "PDC responses...................%u\n",
pdcs->pdc_replies);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
- "Tx err ring full........%u\n",
+ "Tx not done.....................%u\n",
+ pdcs->last_tx_not_done);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "Tx ring full....................%u\n",
+ pdcs->tx_ring_full);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "Rx ring full....................%u\n",
+ pdcs->rx_ring_full);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "Tx desc write fail. Ring full...%u\n",
pdcs->txnobuf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
- "Rx err ring full........%u\n",
+ "Rx desc write fail. Ring full...%u\n",
pdcs->rxnobuf);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
- "Receive overflow........%u\n",
+ "Receive overflow................%u\n",
pdcs->rx_oflow);
+ out_offset += snprintf(buf + out_offset, out_count - out_offset,
+ "Num frags in rx ring............%u\n",
+ NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr,
+ pdcs->nrxpost));
if (out_offset > out_count)
out_offset = out_count;
static void pdc_free_debugfs(void)
{
- if (debugfs_dir && simple_empty(debugfs_dir)) {
- debugfs_remove_recursive(debugfs_dir);
- debugfs_dir = NULL;
- }
+ debugfs_remove_recursive(debugfs_dir);
+ debugfs_dir = NULL;
}
/**
u32 buf_len, u32 flags)
{
struct device *dev = &pdcs->pdev->dev;
+ struct dma64dd *rxd = &pdcs->rxd_64[pdcs->rxout];
dev_dbg(dev,
"Writing rx descriptor for PDC %u at index %u with length %u. flags %#x\n",
pdcs->pdc_idx, pdcs->rxout, buf_len, flags);
- iowrite32(lower_32_bits(dma_addr),
- (void *)&pdcs->rxd_64[pdcs->rxout].addrlow);
- iowrite32(upper_32_bits(dma_addr),
- (void *)&pdcs->rxd_64[pdcs->rxout].addrhigh);
- iowrite32(flags, (void *)&pdcs->rxd_64[pdcs->rxout].ctrl1);
- iowrite32(buf_len, (void *)&pdcs->rxd_64[pdcs->rxout].ctrl2);
+ rxd->addrlow = cpu_to_le32(lower_32_bits(dma_addr));
+ rxd->addrhigh = cpu_to_le32(upper_32_bits(dma_addr));
+ rxd->ctrl1 = cpu_to_le32(flags);
+ rxd->ctrl2 = cpu_to_le32(buf_len);
+
/* bump ring index and return */
pdcs->rxout = NEXTRXD(pdcs->rxout, pdcs->nrxpost);
}
u32 flags)
{
struct device *dev = &pdcs->pdev->dev;
+ struct dma64dd *txd = &pdcs->txd_64[pdcs->txout];
dev_dbg(dev,
"Writing tx descriptor for PDC %u at index %u with length %u, flags %#x\n",
pdcs->pdc_idx, pdcs->txout, buf_len, flags);
- iowrite32(lower_32_bits(dma_addr),
- (void *)&pdcs->txd_64[pdcs->txout].addrlow);
- iowrite32(upper_32_bits(dma_addr),
- (void *)&pdcs->txd_64[pdcs->txout].addrhigh);
- iowrite32(flags, (void *)&pdcs->txd_64[pdcs->txout].ctrl1);
- iowrite32(buf_len, (void *)&pdcs->txd_64[pdcs->txout].ctrl2);
+ txd->addrlow = cpu_to_le32(lower_32_bits(dma_addr));
+ txd->addrhigh = cpu_to_le32(upper_32_bits(dma_addr));
+ txd->ctrl1 = cpu_to_le32(flags);
+ txd->ctrl2 = cpu_to_le32(buf_len);
/* bump ring index and return */
pdcs->txout = NEXTTXD(pdcs->txout, pdcs->ntxpost);
}
/**
- * pdc_receive() - Receive a response message from a given SPU.
+ * pdc_receive_one() - Receive a response message from a given SPU.
* @pdcs: PDC state for the SPU to receive from
- * @mssg: mailbox message to be returned to client
*
* When the return code indicates success, the response message is available in
* the receive buffers provided prior to submission of the request.
*
- * Input:
- * pdcs - PDC state structure for the SPU to be polled
- * mssg - mailbox message to be returned to client. This function sets the
- * context pointer on the message to help the client associate the
- * response with a request.
- *
* Return: PDC_SUCCESS if one or more receive descriptors was processed
* -EAGAIN indicates that no response message is available
* -EIO an error occurred
*/
static int
-pdc_receive(struct pdc_state *pdcs, struct brcm_message *mssg)
+pdc_receive_one(struct pdc_state *pdcs)
{
struct device *dev = &pdcs->pdev->dev;
+ struct mbox_controller *mbc;
+ struct mbox_chan *chan;
+ struct brcm_message mssg;
u32 len, rx_status;
u32 num_frags;
- int i;
u8 *resp_hdr; /* virtual addr of start of resp message DMA header */
u32 frags_rdy; /* number of fragments ready to read */
u32 rx_idx; /* ring index of start of receive frame */
dma_addr_t resp_hdr_daddr;
+ struct pdc_rx_ctx *rx_ctx;
- spin_lock(&pdcs->pdc_lock);
+ mbc = &pdcs->mbc;
+ chan = &mbc->chans[0];
+ mssg.type = BRCM_MESSAGE_SPU;
/*
* return if a complete response message is not yet ready.
* to read.
*/
frags_rdy = NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr, pdcs->nrxpost);
- if ((frags_rdy == 0) || (frags_rdy < pdcs->rxin_numd[pdcs->rxin])) {
- /* See if the hw has written more fragments than we know */
- pdcs->last_rx_curr =
- (ioread32((void *)&pdcs->rxregs_64->status0) &
- CRYPTO_D64_RS0_CD_MASK) / RING_ENTRY_SIZE;
- frags_rdy = NRXDACTIVE(pdcs->rxin, pdcs->last_rx_curr,
- pdcs->nrxpost);
- if ((frags_rdy == 0) ||
- (frags_rdy < pdcs->rxin_numd[pdcs->rxin])) {
- /* No response ready */
- spin_unlock(&pdcs->pdc_lock);
- return -EAGAIN;
- }
- /* can't read descriptors/data until write index is read */
- rmb();
- }
+ if ((frags_rdy == 0) ||
+ (frags_rdy < pdcs->rx_ctx[pdcs->rxin].rxin_numd))
+ /* No response ready */
+ return -EAGAIN;
num_frags = pdcs->txin_numd[pdcs->txin];
+ WARN_ON(num_frags == 0);
+
dma_unmap_sg(dev, pdcs->src_sg[pdcs->txin],
sg_nents(pdcs->src_sg[pdcs->txin]), DMA_TO_DEVICE);
- for (i = 0; i < num_frags; i++)
- pdcs->txin = NEXTTXD(pdcs->txin, pdcs->ntxpost);
+ pdcs->txin = (pdcs->txin + num_frags) & pdcs->ntxpost;
dev_dbg(dev, "PDC %u reclaimed %d tx descriptors",
pdcs->pdc_idx, num_frags);
rx_idx = pdcs->rxin;
- num_frags = pdcs->rxin_numd[rx_idx];
+ rx_ctx = &pdcs->rx_ctx[rx_idx];
+ num_frags = rx_ctx->rxin_numd;
/* Return opaque context with result */
- mssg->ctx = pdcs->rxp_ctx[rx_idx];
- pdcs->rxp_ctx[rx_idx] = NULL;
- resp_hdr = pdcs->resp_hdr[rx_idx];
- resp_hdr_daddr = pdcs->resp_hdr_daddr[rx_idx];
- dma_unmap_sg(dev, pdcs->dst_sg[rx_idx],
- sg_nents(pdcs->dst_sg[rx_idx]), DMA_FROM_DEVICE);
-
- for (i = 0; i < num_frags; i++)
- pdcs->rxin = NEXTRXD(pdcs->rxin, pdcs->nrxpost);
+ mssg.ctx = rx_ctx->rxp_ctx;
+ rx_ctx->rxp_ctx = NULL;
+ resp_hdr = rx_ctx->resp_hdr;
+ resp_hdr_daddr = rx_ctx->resp_hdr_daddr;
+ dma_unmap_sg(dev, rx_ctx->dst_sg, sg_nents(rx_ctx->dst_sg),
+ DMA_FROM_DEVICE);
- spin_unlock(&pdcs->pdc_lock);
+ pdcs->rxin = (pdcs->rxin + num_frags) & pdcs->nrxpost;
dev_dbg(dev, "PDC %u reclaimed %d rx descriptors",
pdcs->pdc_idx, num_frags);
dma_pool_free(pdcs->rx_buf_pool, resp_hdr, resp_hdr_daddr);
+ mbox_chan_received_data(chan, &mssg);
+
pdcs->pdc_replies++;
- /* if we read one or more rx descriptors, claim success */
- if (num_frags > 0)
- return PDC_SUCCESS;
- else
- return -EIO;
+ return PDC_SUCCESS;
+}
+
+/**
+ * pdc_receive() - Process as many responses as are available in the rx ring.
+ * @pdcs: PDC state
+ *
+ * Called within the hard IRQ.
+ * Return:
+ */
+static int
+pdc_receive(struct pdc_state *pdcs)
+{
+ int rx_status;
+
+ /* read last_rx_curr from register once */
+ pdcs->last_rx_curr =
+ (ioread32(&pdcs->rxregs_64->status0) &
+ CRYPTO_D64_RS0_CD_MASK) / RING_ENTRY_SIZE;
+
+ do {
+ /* Could be many frames ready */
+ rx_status = pdc_receive_one(pdcs);
+ } while (rx_status == PDC_SUCCESS);
+
+ return 0;
}
/**
* before chip starts to process new request
*/
wmb();
- iowrite32(pdcs->rxout << 4, (void *)&pdcs->rxregs_64->ptr);
- iowrite32(pdcs->txout << 4, (void *)&pdcs->txregs_64->ptr);
+ iowrite32(pdcs->rxout << 4, &pdcs->rxregs_64->ptr);
+ iowrite32(pdcs->txout << 4, &pdcs->txregs_64->ptr);
pdcs->pdc_requests++;
return PDC_SUCCESS;
u32 rx_pkt_cnt = 1; /* Adding a single rx buffer */
dma_addr_t daddr;
void *vaddr;
+ struct pdc_rx_ctx *rx_ctx;
rx_avail = pdcs->nrxpost - NRXDACTIVE(pdcs->rxin, pdcs->rxout,
pdcs->nrxpost);
/* allocate a buffer for the dma rx status */
vaddr = dma_pool_zalloc(pdcs->rx_buf_pool, GFP_ATOMIC, &daddr);
- if (!vaddr)
+ if (unlikely(!vaddr))
return -ENOMEM;
/*
/* This is always the first descriptor in the receive sequence */
flags = D64_CTRL1_SOF;
- pdcs->rxin_numd[pdcs->rx_msg_start] = 1;
+ pdcs->rx_ctx[pdcs->rx_msg_start].rxin_numd = 1;
if (unlikely(pdcs->rxout == (pdcs->nrxd - 1)))
flags |= D64_CTRL1_EOT;
- pdcs->rxp_ctx[pdcs->rxout] = ctx;
- pdcs->dst_sg[pdcs->rxout] = dst_sg;
- pdcs->resp_hdr[pdcs->rxout] = vaddr;
- pdcs->resp_hdr_daddr[pdcs->rxout] = daddr;
+ rx_ctx = &pdcs->rx_ctx[pdcs->rxout];
+ rx_ctx->rxp_ctx = ctx;
+ rx_ctx->dst_sg = dst_sg;
+ rx_ctx->resp_hdr = vaddr;
+ rx_ctx->resp_hdr_daddr = daddr;
pdc_build_rxd(pdcs, daddr, pdcs->pdc_resp_hdr_len, flags);
return PDC_SUCCESS;
}
desc_w++;
sg = sg_next(sg);
}
- pdcs->rxin_numd[pdcs->rx_msg_start] += desc_w;
+ pdcs->rx_ctx[pdcs->rx_msg_start].rxin_numd += desc_w;
return PDC_SUCCESS;
}
/**
* pdc_irq_handler() - Interrupt handler called in interrupt context.
* @irq: Interrupt number that has fired
- * @cookie: PDC state for DMA engine that generated the interrupt
+ * @data: device struct for DMA engine that generated the interrupt
*
* We have to clear the device interrupt status flags here. So cache the
* status for later use in the thread function. Other than that, just return
* Return: IRQ_WAKE_THREAD if interrupt is ours
* IRQ_NONE otherwise
*/
-static irqreturn_t pdc_irq_handler(int irq, void *cookie)
+static irqreturn_t pdc_irq_handler(int irq, void *data)
{
- struct pdc_state *pdcs = cookie;
+ struct device *dev = (struct device *)data;
+ struct pdc_state *pdcs = dev_get_drvdata(dev);
u32 intstatus = ioread32(pdcs->pdc_reg_vbase + PDC_INTSTATUS_OFFSET);
- if (intstatus & PDC_XMTINTEN_0)
- set_bit(PDC_XMTINT_0, &pdcs->intstatus);
- if (intstatus & PDC_RCVINTEN_0)
- set_bit(PDC_RCVINT_0, &pdcs->intstatus);
+ if (unlikely(intstatus == 0))
+ return IRQ_NONE;
+
+ /* Disable interrupts until soft handler runs */
+ iowrite32(0, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET);
/* Clear interrupt flags in device */
iowrite32(intstatus, pdcs->pdc_reg_vbase + PDC_INTSTATUS_OFFSET);
/* Wakeup IRQ thread */
- if (pdcs && (irq == pdcs->pdc_irq) && (intstatus & PDC_INTMASK))
- return IRQ_WAKE_THREAD;
-
- return IRQ_NONE;
+ tasklet_schedule(&pdcs->rx_tasklet);
+ return IRQ_HANDLED;
}
/**
- * pdc_irq_thread() - Function invoked on deferred thread when a DMA tx has
- * completed or data is available to receive.
- * @irq: Interrupt number
- * @cookie: PDC state for PDC that generated the interrupt
- *
- * On DMA tx complete, notify the mailbox client. On DMA rx complete, process
- * as many SPU response messages as are available and send each to the mailbox
- * client.
- *
- * Return: IRQ_HANDLED if we recognized and handled the interrupt
- * IRQ_NONE otherwise
+ * pdc_tasklet_cb() - Tasklet callback that runs the deferred processing after
+ * a DMA receive interrupt. Reenables the receive interrupt.
+ * @data: PDC state structure
*/
-static irqreturn_t pdc_irq_thread(int irq, void *cookie)
+static void pdc_tasklet_cb(unsigned long data)
{
- struct pdc_state *pdcs = cookie;
- struct mbox_controller *mbc;
- struct mbox_chan *chan;
- bool tx_int;
- bool rx_int;
- int rx_status;
- struct brcm_message mssg;
+ struct pdc_state *pdcs = (struct pdc_state *)data;
- tx_int = test_and_clear_bit(PDC_XMTINT_0, &pdcs->intstatus);
- rx_int = test_and_clear_bit(PDC_RCVINT_0, &pdcs->intstatus);
+ pdc_receive(pdcs);
- if (pdcs && (tx_int || rx_int)) {
- dev_dbg(&pdcs->pdev->dev,
- "%s() got irq %d with tx_int %s, rx_int %s",
- __func__, irq,
- tx_int ? "set" : "clear", rx_int ? "set" : "clear");
-
- mbc = &pdcs->mbc;
- chan = &mbc->chans[0];
-
- if (tx_int) {
- dev_dbg(&pdcs->pdev->dev, "%s(): tx done", __func__);
- /* only one frame in flight at a time */
- mbox_chan_txdone(chan, PDC_SUCCESS);
- }
- if (rx_int) {
- while (1) {
- /* Could be many frames ready */
- memset(&mssg, 0, sizeof(mssg));
- mssg.type = BRCM_MESSAGE_SPU;
- rx_status = pdc_receive(pdcs, &mssg);
- if (rx_status >= 0) {
- dev_dbg(&pdcs->pdev->dev,
- "%s(): invoking client rx cb",
- __func__);
- mbox_chan_received_data(chan, &mssg);
- } else {
- dev_dbg(&pdcs->pdev->dev,
- "%s(): no SPU response available",
- __func__);
- break;
- }
- }
- }
- return IRQ_HANDLED;
- }
- return IRQ_NONE;
+ /* reenable interrupts */
+ iowrite32(PDC_INTMASK, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET);
}
/**
/* Allocate tx ring */
tx.vbase = dma_pool_zalloc(pdcs->ring_pool, GFP_KERNEL, &tx.dmabase);
- if (!tx.vbase) {
+ if (unlikely(!tx.vbase)) {
err = -ENOMEM;
goto done;
}
/* Allocate rx ring */
rx.vbase = dma_pool_zalloc(pdcs->ring_pool, GFP_KERNEL, &rx.dmabase);
- if (!rx.vbase) {
+ if (unlikely(!rx.vbase)) {
err = -ENOMEM;
goto fail_dealloc;
}
dev_dbg(dev, " - base DMA addr of rx ring %pad", &rx.dmabase);
dev_dbg(dev, " - base virtual addr of rx ring %p", rx.vbase);
- /* lock after ring allocation to avoid scheduling while atomic */
- spin_lock(&pdcs->pdc_lock);
-
memcpy(&pdcs->tx_ring_alloc, &tx, sizeof(tx));
memcpy(&pdcs->rx_ring_alloc, &rx, sizeof(rx));
/* Tell device the base DMA address of each ring */
dma_reg = &pdcs->regs->dmaregs[ringset];
+
+ /* But first disable DMA and set curptr to 0 for both TX & RX */
+ iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control);
+ iowrite32((PDC_RX_CTL + (pdcs->rx_status_len << 1)),
+ &dma_reg->dmarcv.control);
+ iowrite32(0, &dma_reg->dmaxmt.ptr);
+ iowrite32(0, &dma_reg->dmarcv.ptr);
+
+ /* Set base DMA addresses */
iowrite32(lower_32_bits(pdcs->tx_ring_alloc.dmabase),
- (void *)&dma_reg->dmaxmt.addrlow);
+ &dma_reg->dmaxmt.addrlow);
iowrite32(upper_32_bits(pdcs->tx_ring_alloc.dmabase),
- (void *)&dma_reg->dmaxmt.addrhigh);
+ &dma_reg->dmaxmt.addrhigh);
iowrite32(lower_32_bits(pdcs->rx_ring_alloc.dmabase),
- (void *)&dma_reg->dmarcv.addrlow);
+ &dma_reg->dmarcv.addrlow);
iowrite32(upper_32_bits(pdcs->rx_ring_alloc.dmabase),
- (void *)&dma_reg->dmarcv.addrhigh);
+ &dma_reg->dmarcv.addrhigh);
+
+ /* Re-enable DMA */
+ iowrite32(PDC_TX_CTL | PDC_TX_ENABLE, &dma_reg->dmaxmt.control);
+ iowrite32((PDC_RX_CTL | PDC_RX_ENABLE | (pdcs->rx_status_len << 1)),
+ &dma_reg->dmarcv.control);
/* Initialize descriptors */
for (i = 0; i < PDC_RING_ENTRIES; i++) {
/* Every tx descriptor can be used for start of frame. */
if (i != pdcs->ntxpost) {
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOF,
- (void *)&pdcs->txd_64[i].ctrl1);
+ &pdcs->txd_64[i].ctrl1);
} else {
/* Last descriptor in ringset. Set End of Table. */
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOF |
- D64_CTRL1_EOT,
- (void *)&pdcs->txd_64[i].ctrl1);
+ D64_CTRL1_EOT, &pdcs->txd_64[i].ctrl1);
}
/* Every rx descriptor can be used for start of frame */
if (i != pdcs->nrxpost) {
iowrite32(D64_CTRL1_SOF,
- (void *)&pdcs->rxd_64[i].ctrl1);
+ &pdcs->rxd_64[i].ctrl1);
} else {
/* Last descriptor in ringset. Set End of Table. */
iowrite32(D64_CTRL1_SOF | D64_CTRL1_EOT,
- (void *)&pdcs->rxd_64[i].ctrl1);
+ &pdcs->rxd_64[i].ctrl1);
}
}
- spin_unlock(&pdcs->pdc_lock);
return PDC_SUCCESS;
fail_dealloc:
}
}
+/**
+ * pdc_desc_count() - Count the number of DMA descriptors that will be required
+ * for a given scatterlist. Account for the max length of a DMA buffer.
+ * @sg: Scatterlist to be DMA'd
+ * Return: Number of descriptors required
+ */
+static u32 pdc_desc_count(struct scatterlist *sg)
+{
+ u32 cnt = 0;
+
+ while (sg) {
+ cnt += ((sg->length / PDC_DMA_BUF_MAX) + 1);
+ sg = sg_next(sg);
+ }
+ return cnt;
+}
+
+/**
+ * pdc_rings_full() - Check whether the tx ring has room for tx_cnt descriptors
+ * and the rx ring has room for rx_cnt descriptors.
+ * @pdcs: PDC state
+ * @tx_cnt: The number of descriptors required in the tx ring
+ * @rx_cnt: The number of descriptors required i the rx ring
+ *
+ * Return: true if one of the rings does not have enough space
+ * false if sufficient space is available in both rings
+ */
+static bool pdc_rings_full(struct pdc_state *pdcs, int tx_cnt, int rx_cnt)
+{
+ u32 rx_avail;
+ u32 tx_avail;
+ bool full = false;
+
+ /* Check if the tx and rx rings are likely to have enough space */
+ rx_avail = pdcs->nrxpost - NRXDACTIVE(pdcs->rxin, pdcs->rxout,
+ pdcs->nrxpost);
+ if (unlikely(rx_cnt > rx_avail)) {
+ pdcs->rx_ring_full++;
+ full = true;
+ }
+
+ if (likely(!full)) {
+ tx_avail = pdcs->ntxpost - NTXDACTIVE(pdcs->txin, pdcs->txout,
+ pdcs->ntxpost);
+ if (unlikely(tx_cnt > tx_avail)) {
+ pdcs->tx_ring_full++;
+ full = true;
+ }
+ }
+ return full;
+}
+
+/**
+ * pdc_last_tx_done() - If both the tx and rx rings have at least
+ * PDC_RING_SPACE_MIN descriptors available, then indicate that the mailbox
+ * framework can submit another message.
+ * @chan: mailbox channel to check
+ * Return: true if PDC can accept another message on this channel
+ */
+static bool pdc_last_tx_done(struct mbox_chan *chan)
+{
+ struct pdc_state *pdcs = chan->con_priv;
+ bool ret;
+
+ if (unlikely(pdc_rings_full(pdcs, PDC_RING_SPACE_MIN,
+ PDC_RING_SPACE_MIN))) {
+ pdcs->last_tx_not_done++;
+ ret = false;
+ } else {
+ ret = true;
+ }
+ return ret;
+}
+
/**
* pdc_send_data() - mailbox send_data function
* @chan: The mailbox channel on which the data is sent. The channel
int src_nent;
int dst_nent;
int nent;
+ u32 tx_desc_req;
+ u32 rx_desc_req;
- if (mssg->type != BRCM_MESSAGE_SPU)
+ if (unlikely(mssg->type != BRCM_MESSAGE_SPU))
return -ENOTSUPP;
src_nent = sg_nents(mssg->spu.src);
- if (src_nent) {
+ if (likely(src_nent)) {
nent = dma_map_sg(dev, mssg->spu.src, src_nent, DMA_TO_DEVICE);
- if (nent == 0)
+ if (unlikely(nent == 0))
return -EIO;
}
dst_nent = sg_nents(mssg->spu.dst);
- if (dst_nent) {
+ if (likely(dst_nent)) {
nent = dma_map_sg(dev, mssg->spu.dst, dst_nent,
DMA_FROM_DEVICE);
- if (nent == 0) {
+ if (unlikely(nent == 0)) {
dma_unmap_sg(dev, mssg->spu.src, src_nent,
DMA_TO_DEVICE);
return -EIO;
}
}
- spin_lock(&pdcs->pdc_lock);
+ /*
+ * Check if the tx and rx rings have enough space. Do this prior to
+ * writing any tx or rx descriptors. Need to ensure that we do not write
+ * a partial set of descriptors, or write just rx descriptors but
+ * corresponding tx descriptors don't fit. Note that we want this check
+ * and the entire sequence of descriptor to happen without another
+ * thread getting in. The channel spin lock in the mailbox framework
+ * ensures this.
+ */
+ tx_desc_req = pdc_desc_count(mssg->spu.src);
+ rx_desc_req = pdc_desc_count(mssg->spu.dst);
+ if (unlikely(pdc_rings_full(pdcs, tx_desc_req, rx_desc_req + 1)))
+ return -ENOSPC;
/* Create rx descriptors to SPU catch response */
err = pdc_rx_list_init(pdcs, mssg->spu.dst, mssg->ctx);
err |= pdc_tx_list_sg_add(pdcs, mssg->spu.src);
err |= pdc_tx_list_final(pdcs); /* initiate transfer */
- spin_unlock(&pdcs->pdc_lock);
-
- if (err)
+ if (unlikely(err))
dev_err(&pdcs->pdev->dev,
"%s failed with error %d", __func__, err);
/* initialize data structures */
pdcs->regs = (struct pdc_regs *)pdcs->pdc_reg_vbase;
pdcs->txregs_64 = (struct dma64_regs *)
- (void *)(((u8 *)pdcs->pdc_reg_vbase) +
+ (((u8 *)pdcs->pdc_reg_vbase) +
PDC_TXREGS_OFFSET + (sizeof(struct dma64) * ringset));
pdcs->rxregs_64 = (struct dma64_regs *)
- (void *)(((u8 *)pdcs->pdc_reg_vbase) +
+ (((u8 *)pdcs->pdc_reg_vbase) +
PDC_RXREGS_OFFSET + (sizeof(struct dma64) * ringset));
pdcs->ntxd = PDC_RING_ENTRIES;
pdcs->nrxd = PDC_RING_ENTRIES;
pdcs->ntxpost = PDC_RING_ENTRIES - 1;
pdcs->nrxpost = PDC_RING_ENTRIES - 1;
- pdcs->regs->intmask = 0;
+ iowrite32(0, &pdcs->regs->intmask);
dma_reg = &pdcs->regs->dmaregs[ringset];
- iowrite32(0, (void *)&dma_reg->dmaxmt.ptr);
- iowrite32(0, (void *)&dma_reg->dmarcv.ptr);
- iowrite32(PDC_TX_CTL, (void *)&dma_reg->dmaxmt.control);
+ /* Configure DMA but will enable later in pdc_ring_init() */
+ iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control);
iowrite32(PDC_RX_CTL + (pdcs->rx_status_len << 1),
- (void *)&dma_reg->dmarcv.control);
+ &dma_reg->dmarcv.control);
+
+ /* Reset current index pointers after making sure DMA is disabled */
+ iowrite32(0, &dma_reg->dmaxmt.ptr);
+ iowrite32(0, &dma_reg->dmarcv.ptr);
if (pdcs->pdc_resp_hdr_len == PDC_SPU2_RESP_HDR_LEN)
iowrite32(PDC_CKSUM_CTRL,
pdcs->pdc_reg_vbase + PDC_CKSUM_CTRL_OFFSET);
}
+/**
+ * pdc_hw_disable() - Disable the tx and rx control in the hw.
+ * @pdcs: PDC state structure
+ *
+ */
+static void pdc_hw_disable(struct pdc_state *pdcs)
+{
+ struct dma64 *dma_reg;
+
+ dma_reg = &pdcs->regs->dmaregs[PDC_RINGSET];
+ iowrite32(PDC_TX_CTL, &dma_reg->dmaxmt.control);
+ iowrite32(PDC_RX_CTL + (pdcs->rx_status_len << 1),
+ &dma_reg->dmarcv.control);
+}
+
/**
* pdc_rx_buf_pool_create() - Pool of receive buffers used to catch the metadata
* header returned with each response message.
struct device_node *dn = pdev->dev.of_node;
int err;
- pdcs->intstatus = 0;
-
/* interrupt configuration */
iowrite32(PDC_INTMASK, pdcs->pdc_reg_vbase + PDC_INTMASK_OFFSET);
iowrite32(PDC_LAZY_INT, pdcs->pdc_reg_vbase + PDC_RCVLAZY0_OFFSET);
pdcs->pdc_irq = irq_of_parse_and_map(dn, 0);
dev_dbg(dev, "pdc device %s irq %u for pdcs %p",
dev_name(dev), pdcs->pdc_irq, pdcs);
- err = devm_request_threaded_irq(dev, pdcs->pdc_irq,
- pdc_irq_handler,
- pdc_irq_thread, 0, dev_name(dev), pdcs);
+
+ err = devm_request_irq(dev, pdcs->pdc_irq, pdc_irq_handler, 0,
+ dev_name(dev), dev);
if (err) {
- dev_err(dev, "threaded tx IRQ %u request failed with err %d\n",
+ dev_err(dev, "IRQ %u request failed with err %d\n",
pdcs->pdc_irq, err);
return err;
}
static const struct mbox_chan_ops pdc_mbox_chan_ops = {
.send_data = pdc_send_data,
+ .last_tx_done = pdc_last_tx_done,
.startup = pdc_startup,
.shutdown = pdc_shutdown
};
if (!mbc->chans)
return -ENOMEM;
- mbc->txdone_irq = true;
- mbc->txdone_poll = false;
+ mbc->txdone_irq = false;
+ mbc->txdone_poll = true;
+ mbc->txpoll_period = 1;
for (chan_index = 0; chan_index < mbc->num_chans; chan_index++)
mbc->chans[chan_index].con_priv = pdcs;
goto cleanup;
}
- spin_lock_init(&pdcs->pdc_lock);
pdcs->pdev = pdev;
platform_set_drvdata(pdev, pdcs);
pdcs->pdc_idx = pdcg.num_spu;
pdc_hw_init(pdcs);
+ /* Init tasklet for deferred DMA rx processing */
+ tasklet_init(&pdcs->rx_tasklet, pdc_tasklet_cb, (unsigned long)pdcs);
+
err = pdc_interrupts_init(pdcs);
if (err)
goto cleanup_buf_pool;
return PDC_SUCCESS;
cleanup_buf_pool:
+ tasklet_kill(&pdcs->rx_tasklet);
dma_pool_destroy(pdcs->rx_buf_pool);
cleanup_ring_pool:
pdc_free_debugfs();
+ tasklet_kill(&pdcs->rx_tasklet);
+
+ pdc_hw_disable(pdcs);
+
mbox_controller_unregister(&pdcs->mbc);
dma_pool_destroy(pdcs->rx_buf_pool);
projects / linux-2.6-microblaze.git / blobdiff