1 files changed, 641 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/htc_hif.c b/drivers/net/wireless/ath/ath6kl/htc_hif.c
new file mode 100644
index 000000000000..86b1cc7409c2
--- /dev/null
+++ b/drivers/net/wireless/ath/ath6kl/htc_hif.c
@@ -0,0 +1,641 @@
+/*
+ * Copyright (c) 2007-2011 Atheros Communications Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "core.h"
+#include "target.h"
+#include "hif-ops.h"
+#include "htc_hif.h"
+#include "debug.h"
+
+#define MAILBOX_FOR_BLOCK_SIZE          1
+
+#define ATH6KL_TIME_QUANTUM	10  /* in ms */
+
+static int ath6kldev_cp_scat_dma_buf(struct hif_scatter_req *req, bool from_dma)
+{
+	u8 *buf;
+	int i;
+
+	buf = req->virt_dma_buf;
+
+	for (i = 0; i < req->scat_entries; i++) {
+
+		if (from_dma)
+			memcpy(req->scat_list[i].buf, buf,
+			       req->scat_list[i].len);
+		else
+			memcpy(buf, req->scat_list[i].buf,
+			       req->scat_list[i].len);
+
+		buf += req->scat_list[i].len;
+	}
+
+	return 0;
+}
+
+int ath6kldev_rw_comp_handler(void *context, int status)
+{
+	struct htc_packet *packet = context;
+
+	ath6kl_dbg(ATH6KL_DBG_HTC_RECV,
+		   "ath6kldev_rw_comp_handler (pkt:0x%p , status: %d\n",
+		   packet, status);
+
+	packet->status = status;
+	packet->completion(packet->context, packet);
+
+	return 0;
+}
+
+static int ath6kldev_proc_dbg_intr(struct ath6kl_device *dev)
+{
+	u32 dummy;
+	int status;
+
+	ath6kl_err("target debug interrupt\n");
+
+	ath6kl_target_failure(dev->ar);
+
+	/*
+	 * read counter to clear the interrupt, the debug error interrupt is
+	 * counter 0.
+	 */
+	status = hif_read_write_sync(dev->ar, COUNT_DEC_ADDRESS,
+				     (u8 *)&dummy, 4, HIF_RD_SYNC_BYTE_INC);
+	if (status)
+		WARN_ON(1);
+
+	return status;
+}
+
+/* mailbox recv message polling */
+int ath6kldev_poll_mboxmsg_rx(struct ath6kl_device *dev, u32 *lk_ahd,
+			      int timeout)
+{
+	struct ath6kl_irq_proc_registers *rg;
+	int status = 0, i;
+	u8 htc_mbox = 1 << HTC_MAILBOX;
+
+	for (i = timeout / ATH6KL_TIME_QUANTUM; i > 0; i--) {
+		/* this is the standard HIF way, load the reg table */
+		status = hif_read_write_sync(dev->ar, HOST_INT_STATUS_ADDRESS,
+					     (u8 *) &dev->irq_proc_reg,
+					     sizeof(dev->irq_proc_reg),
+					     HIF_RD_SYNC_BYTE_INC);
+
+		if (status) {
+			ath6kl_err("failed to read reg table\n");
+			return status;
+		}
+
+		/* check for MBOX data and valid lookahead */
+		if (dev->irq_proc_reg.host_int_status & htc_mbox) {
+			if (dev->irq_proc_reg.rx_lkahd_valid &
+			    htc_mbox) {
+				/*
+				 * Mailbox has a message and the look ahead
+				 * is valid.
+				 */
+				rg = &dev->irq_proc_reg;
+				*lk_ahd =
+					le32_to_cpu(rg->rx_lkahd[HTC_MAILBOX]);
+				break;
+			}
+		}
+
+		/* delay a little  */
+		mdelay(ATH6KL_TIME_QUANTUM);
+		ath6kl_dbg(ATH6KL_DBG_HTC_RECV, "retry mbox poll : %d\n", i);
+	}
+
+	if (i == 0) {
+		ath6kl_err("timeout waiting for recv message\n");
+		status = -ETIME;
+		/* check if the target asserted */
+		if (dev->irq_proc_reg.counter_int_status &
+		    ATH6KL_TARGET_DEBUG_INTR_MASK)
+			/*
+			 * Target failure handler will be called in case of
+			 * an assert.
+			 */
+			ath6kldev_proc_dbg_intr(dev);
+	}
+
+	return status;
+}
+
+/*
+ * Disable packet reception (used in case the host runs out of buffers)
+ * using the interrupt enable registers through the host I/F
+ */
+int ath6kldev_rx_control(struct ath6kl_device *dev, bool enable_rx)
+{
+	struct ath6kl_irq_enable_reg regs;
+	int status = 0;
+
+	/* take the lock to protect interrupt enable shadows */
+	spin_lock_bh(&dev->lock);
+
+	if (enable_rx)
+		dev->irq_en_reg.int_status_en |=
+			SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
+	else
+		dev->irq_en_reg.int_status_en &=
+		    ~SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
+
+	memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
+
+	spin_unlock_bh(&dev->lock);
+
+	status = hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
+				     &regs.int_status_en,
+				     sizeof(struct ath6kl_irq_enable_reg),
+				     HIF_WR_SYNC_BYTE_INC);
+
+	return status;
+}
+
+int ath6kldev_submit_scat_req(struct ath6kl_device *dev,
+			      struct hif_scatter_req *scat_req, bool read)
+{
+	int status = 0;
+
+	if (read) {
+		scat_req->req = HIF_RD_SYNC_BLOCK_FIX;
+		scat_req->addr = dev->ar->mbox_info.htc_addr;
+	} else {
+		scat_req->req = HIF_WR_ASYNC_BLOCK_INC;
+
+		scat_req->addr =
+			(scat_req->len > HIF_MBOX_WIDTH) ?
+			dev->ar->mbox_info.htc_ext_addr :
+			dev->ar->mbox_info.htc_addr;
+	}
+
+	ath6kl_dbg((ATH6KL_DBG_HTC_RECV | ATH6KL_DBG_HTC_SEND),
+		   "ath6kldev_submit_scat_req, entries: %d, total len: %d mbox:0x%X (mode: %s : %s)\n",
+		   scat_req->scat_entries, scat_req->len,
+		   scat_req->addr, !read ? "async" : "sync",
+		   (read) ? "rd" : "wr");
+
+	if (!read && scat_req->virt_scat) {
+		status = ath6kldev_cp_scat_dma_buf(scat_req, false);
+		if (status) {
+			scat_req->status = status;
+			scat_req->complete(dev->ar->htc_target, scat_req);
+			return 0;
+		}
+	}
+
+	status = ath6kl_hif_scat_req_rw(dev->ar, scat_req);
+
+	if (read) {
+		/* in sync mode, we can touch the scatter request */
+		scat_req->status = status;
+		if (!status && scat_req->virt_scat)
+			scat_req->status =
+				ath6kldev_cp_scat_dma_buf(scat_req, true);
+	}
+
+	return status;
+}
+
+static int ath6kldev_proc_counter_intr(struct ath6kl_device *dev)
+{
+	u8 counter_int_status;
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ, "counter interrupt\n");
+
+	counter_int_status = dev->irq_proc_reg.counter_int_status &
+			     dev->irq_en_reg.cntr_int_status_en;
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		"valid interrupt source(s) in COUNTER_INT_STATUS: 0x%x\n",
+		counter_int_status);
+
+	/*
+	 * NOTE: other modules like GMBOX may use the counter interrupt for
+	 * credit flow control on other counters, we only need to check for
+	 * the debug assertion counter interrupt.
+	 */
+	if (counter_int_status & ATH6KL_TARGET_DEBUG_INTR_MASK)
+		return ath6kldev_proc_dbg_intr(dev);
+
+	return 0;
+}
+
+static int ath6kldev_proc_err_intr(struct ath6kl_device *dev)
+{
+	int status;
+	u8 error_int_status;
+	u8 reg_buf[4];
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ, "error interrupt\n");
+
+	error_int_status = dev->irq_proc_reg.error_int_status & 0x0F;
+	if (!error_int_status) {
+		WARN_ON(1);
+		return -EIO;
+	}
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		   "valid interrupt source(s) in ERROR_INT_STATUS: 0x%x\n",
+		   error_int_status);
+
+	if (MS(ERROR_INT_STATUS_WAKEUP, error_int_status))
+		ath6kl_dbg(ATH6KL_DBG_IRQ, "error : wakeup\n");
+
+	if (MS(ERROR_INT_STATUS_RX_UNDERFLOW, error_int_status))
+		ath6kl_err("rx underflow\n");
+
+	if (MS(ERROR_INT_STATUS_TX_OVERFLOW, error_int_status))
+		ath6kl_err("tx overflow\n");
+
+	/* Clear the interrupt */
+	dev->irq_proc_reg.error_int_status &= ~error_int_status;
+
+	/* set W1C value to clear the interrupt, this hits the register first */
+	reg_buf[0] = error_int_status;
+	reg_buf[1] = 0;
+	reg_buf[2] = 0;
+	reg_buf[3] = 0;
+
+	status = hif_read_write_sync(dev->ar, ERROR_INT_STATUS_ADDRESS,
+				     reg_buf, 4, HIF_WR_SYNC_BYTE_FIX);
+
+	if (status)
+		WARN_ON(1);
+
+	return status;
+}
+
+static int ath6kldev_proc_cpu_intr(struct ath6kl_device *dev)
+{
+	int status;
+	u8 cpu_int_status;
+	u8 reg_buf[4];
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ, "cpu interrupt\n");
+
+	cpu_int_status = dev->irq_proc_reg.cpu_int_status &
+			 dev->irq_en_reg.cpu_int_status_en;
+	if (!cpu_int_status) {
+		WARN_ON(1);
+		return -EIO;
+	}
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		"valid interrupt source(s) in CPU_INT_STATUS: 0x%x\n",
+		cpu_int_status);
+
+	/* Clear the interrupt */
+	dev->irq_proc_reg.cpu_int_status &= ~cpu_int_status;
+
+	/*
+	 * Set up the register transfer buffer to hit the register 4 times ,
+	 * this is done to make the access 4-byte aligned to mitigate issues
+	 * with host bus interconnects that restrict bus transfer lengths to
+	 * be a multiple of 4-bytes.
+	 */
+
+	/* set W1C value to clear the interrupt, this hits the register first */
+	reg_buf[0] = cpu_int_status;
+	/* the remaining are set to zero which have no-effect  */
+	reg_buf[1] = 0;
+	reg_buf[2] = 0;
+	reg_buf[3] = 0;
+
+	status = hif_read_write_sync(dev->ar, CPU_INT_STATUS_ADDRESS,
+				     reg_buf, 4, HIF_WR_SYNC_BYTE_FIX);
+
+	if (status)
+		WARN_ON(1);
+
+	return status;
+}
+
+/* process pending interrupts synchronously */
+static int proc_pending_irqs(struct ath6kl_device *dev, bool *done)
+{
+	struct ath6kl_irq_proc_registers *rg;
+	int status = 0;
+	u8 host_int_status = 0;
+	u32 lk_ahd = 0;
+	u8 htc_mbox = 1 << HTC_MAILBOX;
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ, "proc_pending_irqs: (dev: 0x%p)\n", dev);
+
+	/*
+	 * NOTE: HIF implementation guarantees that the context of this
+	 * call allows us to perform SYNCHRONOUS I/O, that is we can block,
+	 * sleep or call any API that can block or switch thread/task
+	 * contexts. This is a fully schedulable context.
+	 */
+
+	/*
+	 * Process pending intr only when int_status_en is clear, it may
+	 * result in unnecessary bus transaction otherwise. Target may be
+	 * unresponsive at the time.
+	 */
+	if (dev->irq_en_reg.int_status_en) {
+		/*
+		 * Read the first 28 bytes of the HTC register table. This
+		 * will yield us the value of different int status
+		 * registers and the lookahead registers.
+		 *
+		 *    length = sizeof(int_status) + sizeof(cpu_int_status)
+		 *             + sizeof(error_int_status) +
+		 *             sizeof(counter_int_status) +
+		 *             sizeof(mbox_frame) + sizeof(rx_lkahd_valid)
+		 *             + sizeof(hole) + sizeof(rx_lkahd) +
+		 *             sizeof(int_status_en) +
+		 *             sizeof(cpu_int_status_en) +
+		 *             sizeof(err_int_status_en) +
+		 *             sizeof(cntr_int_status_en);
+		 */
+		status = hif_read_write_sync(dev->ar, HOST_INT_STATUS_ADDRESS,
+					     (u8 *) &dev->irq_proc_reg,
+					     sizeof(dev->irq_proc_reg),
+					     HIF_RD_SYNC_BYTE_INC);
+		if (status)
+			goto out;
+
+		if (AR_DBG_LVL_CHECK(ATH6KL_DBG_IRQ))
+			ath6kl_dump_registers(dev, &dev->irq_proc_reg,
+					 &dev->irq_en_reg);
+
+		/* Update only those registers that are enabled */
+		host_int_status = dev->irq_proc_reg.host_int_status &
+				  dev->irq_en_reg.int_status_en;
+
+		/* Look at mbox status */
+		if (host_int_status & htc_mbox) {
+			/*
+			 * Mask out pending mbox value, we use "lookAhead as
+			 * the real flag for mbox processing.
+			 */
+			host_int_status &= ~htc_mbox;
+			if (dev->irq_proc_reg.rx_lkahd_valid &
+			    htc_mbox) {
+				rg = &dev->irq_proc_reg;
+				lk_ahd = le32_to_cpu(rg->rx_lkahd[HTC_MAILBOX]);
+				if (!lk_ahd)
+					ath6kl_err("lookAhead is zero!\n");
+			}
+		}
+	}
+
+	if (!host_int_status && !lk_ahd) {
+		*done = true;
+		goto out;
+	}
+
+	if (lk_ahd) {
+		int fetched = 0;
+
+		ath6kl_dbg(ATH6KL_DBG_IRQ,
+			   "pending mailbox msg, lk_ahd: 0x%X\n", lk_ahd);
+		/*
+		 * Mailbox Interrupt, the HTC layer may issue async
+		 * requests to empty the mailbox. When emptying the recv
+		 * mailbox we use the async handler above called from the
+		 * completion routine of the callers read request. This can
+		 * improve performance by reducing context switching when
+		 * we rapidly pull packets.
+		 */
+		status = ath6kl_htc_rxmsg_pending_handler(dev->htc_cnxt,
+							  &lk_ahd, &fetched);
+		if (status)
+			goto out;
+
+		if (!fetched)
+			/*
+			 * HTC could not pull any messages out due to lack
+			 * of resources.
+			 */
+			dev->htc_cnxt->chk_irq_status_cnt = 0;
+	}
+
+	/* now handle the rest of them */
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		   "valid interrupt source(s) for other interrupts: 0x%x\n",
+		   host_int_status);
+
+	if (MS(HOST_INT_STATUS_CPU, host_int_status)) {
+		/* CPU Interrupt */
+		status = ath6kldev_proc_cpu_intr(dev);
+		if (status)
+			goto out;
+	}
+
+	if (MS(HOST_INT_STATUS_ERROR, host_int_status)) {
+		/* Error Interrupt */
+		status = ath6kldev_proc_err_intr(dev);
+		if (status)
+			goto out;
+	}
+
+	if (MS(HOST_INT_STATUS_COUNTER, host_int_status))
+		/* Counter Interrupt */
+		status = ath6kldev_proc_counter_intr(dev);
+
+out:
+	/*
+	 * An optimization to bypass reading the IRQ status registers
+	 * unecessarily which can re-wake the target, if upper layers
+	 * determine that we are in a low-throughput mode, we can rely on
+	 * taking another interrupt rather than re-checking the status
+	 * registers which can re-wake the target.
+	 *
+	 * NOTE : for host interfaces that makes use of detecting pending
+	 * mbox messages at hif can not use this optimization due to
+	 * possible side effects, SPI requires the host to drain all
+	 * messages from the mailbox before exiting the ISR routine.
+	 */
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		   "bypassing irq status re-check, forcing done\n");
+
+	if (!dev->htc_cnxt->chk_irq_status_cnt)
+		*done = true;
+
+	ath6kl_dbg(ATH6KL_DBG_IRQ,
+		   "proc_pending_irqs: (done:%d, status=%d\n", *done, status);
+
+	return status;
+}
+
+/* interrupt handler, kicks off all interrupt processing */
+int ath6kldev_intr_bh_handler(struct ath6kl *ar)
+{
+	struct ath6kl_device *dev = ar->htc_target->dev;
+	int status = 0;
+	bool done = false;
+
+	/*
+	 * Reset counter used to flag a re-scan of IRQ status registers on
+	 * the target.
+	 */
+	dev->htc_cnxt->chk_irq_status_cnt = 0;
+
+	/*
+	 * IRQ processing is synchronous, interrupt status registers can be
+	 * re-read.
+	 */
+	while (!done) {
+		status = proc_pending_irqs(dev, &done);
+		if (status)
+			break;
+	}
+
+	return status;
+}
+
+static int ath6kldev_enable_intrs(struct ath6kl_device *dev)
+{
+	struct ath6kl_irq_enable_reg regs;
+	int status;
+
+	spin_lock_bh(&dev->lock);
+
+	/* Enable all but ATH6KL CPU interrupts */
+	dev->irq_en_reg.int_status_en =
+			SM(INT_STATUS_ENABLE_ERROR, 0x01) |
+			SM(INT_STATUS_ENABLE_CPU, 0x01) |
+			SM(INT_STATUS_ENABLE_COUNTER, 0x01);
+
+	/*
+	 * NOTE: There are some cases where HIF can do detection of
+	 * pending mbox messages which is disabled now.
+	 */
+	dev->irq_en_reg.int_status_en |= SM(INT_STATUS_ENABLE_MBOX_DATA, 0x01);
+
+	/* Set up the CPU Interrupt status Register */
+	dev->irq_en_reg.cpu_int_status_en = 0;
+
+	/* Set up the Error Interrupt status Register */
+	dev->irq_en_reg.err_int_status_en =
+		SM(ERROR_STATUS_ENABLE_RX_UNDERFLOW, 0x01) |
+		SM(ERROR_STATUS_ENABLE_TX_OVERFLOW, 0x1);
+
+	/*
+	 * Enable Counter interrupt status register to get fatal errors for
+	 * debugging.
+	 */
+	dev->irq_en_reg.cntr_int_status_en = SM(COUNTER_INT_STATUS_ENABLE_BIT,
+						ATH6KL_TARGET_DEBUG_INTR_MASK);
+	memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
+
+	spin_unlock_bh(&dev->lock);
+
+	status = hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
+				     &regs.int_status_en, sizeof(regs),
+				     HIF_WR_SYNC_BYTE_INC);
+
+	if (status)
+		ath6kl_err("failed to update interrupt ctl reg err: %d\n",
+			   status);
+
+	return status;
+}
+
+int ath6kldev_disable_intrs(struct ath6kl_device *dev)
+{
+	struct ath6kl_irq_enable_reg regs;
+
+	spin_lock_bh(&dev->lock);
+	/* Disable all interrupts */
+	dev->irq_en_reg.int_status_en = 0;
+	dev->irq_en_reg.cpu_int_status_en = 0;
+	dev->irq_en_reg.err_int_status_en = 0;
+	dev->irq_en_reg.cntr_int_status_en = 0;
+	memcpy(&regs, &dev->irq_en_reg, sizeof(regs));
+	spin_unlock_bh(&dev->lock);
+
+	return hif_read_write_sync(dev->ar, INT_STATUS_ENABLE_ADDRESS,
+				   &regs.int_status_en, sizeof(regs),
+				   HIF_WR_SYNC_BYTE_INC);
+}
+
+/* enable device interrupts */
+int ath6kldev_unmask_intrs(struct ath6kl_device *dev)
+{
+	int status = 0;
+
+	/*
+	 * Make sure interrupt are disabled before unmasking at the HIF
+	 * layer. The rationale here is that between device insertion
+	 * (where we clear the interrupts the first time) and when HTC
+	 * is finally ready to handle interrupts, other software can perform
+	 * target "soft" resets. The ATH6KL interrupt enables reset back to an
+	 * "enabled" state when this happens.
+	 */
+	ath6kldev_disable_intrs(dev);
+
+	/* unmask the host controller interrupts */
+	ath6kl_hif_irq_enable(dev->ar);
+	status = ath6kldev_enable_intrs(dev);
+
+	return status;
+}
+
+/* disable all device interrupts */
+int ath6kldev_mask_intrs(struct ath6kl_device *dev)
+{
+	/*
+	 * Mask the interrupt at the HIF layer to avoid any stray interrupt
+	 * taken while we zero out our shadow registers in
+	 * ath6kldev_disable_intrs().
+	 */
+	ath6kl_hif_irq_disable(dev->ar);
+
+	return ath6kldev_disable_intrs(dev);
+}
+
+int ath6kldev_setup(struct ath6kl_device *dev)
+{
+	int status = 0;
+
+	spin_lock_init(&dev->lock);
+
+	/*
+	 * NOTE: we actually get the block size of a mailbox other than 0,
+	 * for SDIO the block size on mailbox 0 is artificially set to 1.
+	 * So we use the block size that is set for the other 3 mailboxes.
+	 */
+	dev->htc_cnxt->block_sz = dev->ar->mbox_info.block_size;
+
+	/* must be a power of 2 */
+	if ((dev->htc_cnxt->block_sz & (dev->htc_cnxt->block_sz - 1)) != 0) {
+		WARN_ON(1);
+		goto fail_setup;
+	}
+
+	/* assemble mask, used for padding to a block */
+	dev->htc_cnxt->block_mask = dev->htc_cnxt->block_sz - 1;
+
+	ath6kl_dbg(ATH6KL_DBG_TRC, "block size: %d, mbox addr:0x%X\n",
+		   dev->htc_cnxt->block_sz, dev->ar->mbox_info.htc_addr);
+
+	ath6kl_dbg(ATH6KL_DBG_TRC,
+		   "hif interrupt processing is sync only\n");
+
+	status = ath6kldev_disable_intrs(dev);
+
+fail_setup:
+	return status;
+
+}