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path: root/drivers/net/wireless/ath/ath6kl/htc_hif.c
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Diffstat (limited to 'drivers/net/wireless/ath/ath6kl/htc_hif.c')
-rw-r--r--drivers/net/wireless/ath/ath6kl/htc_hif.c641
1 files changed, 0 insertions, 641 deletions
diff --git a/drivers/net/wireless/ath/ath6kl/htc_hif.c b/drivers/net/wireless/ath/ath6kl/htc_hif.c
deleted file mode 100644
index 86b1cc7409c..00000000000
--- a/drivers/net/wireless/ath/ath6kl/htc_hif.c
+++ /dev/null
@@ -1,641 +0,0 @@
-/*
- * 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;
-
-}
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