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path: root/drivers/net/wireless/rsi/rsi_91x_sdio_ops.c
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Diffstat (limited to 'drivers/net/wireless/rsi/rsi_91x_sdio_ops.c')
-rw-r--r--drivers/net/wireless/rsi/rsi_91x_sdio_ops.c420
1 files changed, 420 insertions, 0 deletions
diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio_ops.c b/drivers/net/wireless/rsi/rsi_91x_sdio_ops.c
new file mode 100644
index 000000000..b2b47a0ab
--- /dev/null
+++ b/drivers/net/wireless/rsi/rsi_91x_sdio_ops.c
@@ -0,0 +1,420 @@
+/*
+ * Copyright (c) 2014 Redpine Signals 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 <linux/firmware.h>
+#include <net/rsi_91x.h>
+#include "rsi_sdio.h"
+#include "rsi_common.h"
+
+/**
+ * rsi_sdio_master_access_msword() - This function sets the AHB master access
+ * MS word in the SDIO slave registers.
+ * @adapter: Pointer to the adapter structure.
+ * @ms_word: ms word need to be initialized.
+ *
+ * Return: status: 0 on success, -1 on failure.
+ */
+int rsi_sdio_master_access_msword(struct rsi_hw *adapter, u16 ms_word)
+{
+ u8 byte;
+ u8 function = 0;
+ int status = 0;
+
+ byte = (u8)(ms_word & 0x00FF);
+
+ rsi_dbg(INIT_ZONE,
+ "%s: MASTER_ACCESS_MSBYTE:0x%x\n", __func__, byte);
+
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_MASTER_ACCESS_MSBYTE,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: fail to access MASTER_ACCESS_MSBYTE\n",
+ __func__);
+ return -1;
+ }
+
+ byte = (u8)(ms_word >> 8);
+
+ rsi_dbg(INIT_ZONE, "%s:MASTER_ACCESS_LSBYTE:0x%x\n", __func__, byte);
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_MASTER_ACCESS_LSBYTE,
+ &byte);
+ return status;
+}
+
+static void rsi_rx_handler(struct rsi_hw *adapter);
+
+void rsi_sdio_rx_thread(struct rsi_common *common)
+{
+ struct rsi_hw *adapter = common->priv;
+ struct rsi_91x_sdiodev *sdev = adapter->rsi_dev;
+
+ do {
+ rsi_wait_event(&sdev->rx_thread.event, EVENT_WAIT_FOREVER);
+ rsi_reset_event(&sdev->rx_thread.event);
+ rsi_rx_handler(adapter);
+ } while (!atomic_read(&sdev->rx_thread.thread_done));
+
+ rsi_dbg(INFO_ZONE, "%s: Terminated SDIO RX thread\n", __func__);
+ atomic_inc(&sdev->rx_thread.thread_done);
+ kthread_complete_and_exit(&sdev->rx_thread.completion, 0);
+}
+
+/**
+ * rsi_process_pkt() - This Function reads rx_blocks register and figures out
+ * the size of the rx pkt.
+ * @common: Pointer to the driver private structure.
+ *
+ * Return: 0 on success, -1 on failure.
+ */
+static int rsi_process_pkt(struct rsi_common *common)
+{
+ struct rsi_hw *adapter = common->priv;
+ struct rsi_91x_sdiodev *dev =
+ (struct rsi_91x_sdiodev *)adapter->rsi_dev;
+ u8 num_blks = 0;
+ u32 rcv_pkt_len = 0;
+ int status = 0;
+ u8 value = 0;
+
+ num_blks = ((adapter->interrupt_status & 1) |
+ ((adapter->interrupt_status >> RECV_NUM_BLOCKS) << 1));
+
+ if (!num_blks) {
+ status = rsi_sdio_read_register(adapter,
+ SDIO_RX_NUM_BLOCKS_REG,
+ &value);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to read pkt length from the card:\n",
+ __func__);
+ return status;
+ }
+ num_blks = value & 0x1f;
+ }
+
+ if (dev->write_fail == 2)
+ rsi_sdio_ack_intr(common->priv, (1 << MSDU_PKT_PENDING));
+
+ if (unlikely(!num_blks)) {
+ dev->write_fail = 2;
+ return -1;
+ }
+
+ rcv_pkt_len = (num_blks * 256);
+
+ status = rsi_sdio_host_intf_read_pkt(adapter, dev->pktbuffer,
+ rcv_pkt_len);
+ if (status) {
+ rsi_dbg(ERR_ZONE, "%s: Failed to read packet from card\n",
+ __func__);
+ return status;
+ }
+
+ status = rsi_read_pkt(common, dev->pktbuffer, rcv_pkt_len);
+ if (status) {
+ rsi_dbg(ERR_ZONE, "Failed to read the packet\n");
+ return status;
+ }
+
+ return 0;
+}
+
+/**
+ * rsi_init_sdio_slave_regs() - This function does the actual initialization
+ * of SDBUS slave registers.
+ * @adapter: Pointer to the adapter structure.
+ *
+ * Return: status: 0 on success, -1 on failure.
+ */
+int rsi_init_sdio_slave_regs(struct rsi_hw *adapter)
+{
+ struct rsi_91x_sdiodev *dev =
+ (struct rsi_91x_sdiodev *)adapter->rsi_dev;
+ u8 function = 0;
+ u8 byte;
+ int status = 0;
+
+ if (dev->next_read_delay) {
+ byte = dev->next_read_delay;
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_NXT_RD_DELAY2,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to write SDIO_NXT_RD_DELAY2\n",
+ __func__);
+ return -1;
+ }
+ }
+
+ if (dev->sdio_high_speed_enable) {
+ rsi_dbg(INIT_ZONE, "%s: Enabling SDIO High speed\n", __func__);
+ byte = 0x3;
+
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_REG_HIGH_SPEED,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to enable SDIO high speed\n",
+ __func__);
+ return -1;
+ }
+ }
+
+ /* This tells SDIO FIFO when to start read to host */
+ rsi_dbg(INIT_ZONE, "%s: Initializing SDIO read start level\n", __func__);
+ byte = 0x24;
+
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_READ_START_LVL,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to write SDIO_READ_START_LVL\n", __func__);
+ return -1;
+ }
+
+ rsi_dbg(INIT_ZONE, "%s: Initializing FIFO ctrl registers\n", __func__);
+ byte = (128 - 32);
+
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_READ_FIFO_CTL,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to write SDIO_READ_FIFO_CTL\n", __func__);
+ return -1;
+ }
+
+ byte = 32;
+ status = rsi_sdio_write_register(adapter,
+ function,
+ SDIO_WRITE_FIFO_CTL,
+ &byte);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to write SDIO_WRITE_FIFO_CTL\n", __func__);
+ return -1;
+ }
+
+ return 0;
+}
+
+/**
+ * rsi_rx_handler() - Read and process SDIO interrupts.
+ * @adapter: Pointer to the adapter structure.
+ *
+ * Return: None.
+ */
+static void rsi_rx_handler(struct rsi_hw *adapter)
+{
+ struct rsi_common *common = adapter->priv;
+ struct rsi_91x_sdiodev *dev =
+ (struct rsi_91x_sdiodev *)adapter->rsi_dev;
+ int status;
+ u8 isr_status = 0;
+ u8 fw_status = 0;
+
+ dev->rx_info.sdio_int_counter++;
+
+ do {
+ mutex_lock(&common->rx_lock);
+ status = rsi_sdio_read_register(common->priv,
+ RSI_FN1_INT_REGISTER,
+ &isr_status);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to Read Intr Status Register\n",
+ __func__);
+ mutex_unlock(&common->rx_lock);
+ return;
+ }
+ adapter->interrupt_status = isr_status;
+
+ if (isr_status == 0) {
+ rsi_set_event(&common->tx_thread.event);
+ dev->rx_info.sdio_intr_status_zero++;
+ mutex_unlock(&common->rx_lock);
+ return;
+ }
+
+ rsi_dbg(ISR_ZONE, "%s: Intr_status = %x %d %d\n",
+ __func__, isr_status, (1 << MSDU_PKT_PENDING),
+ (1 << FW_ASSERT_IND));
+
+ if (isr_status & BIT(PKT_BUFF_AVAILABLE)) {
+ status = rsi_sdio_check_buffer_status(adapter, 0);
+ if (status < 0)
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to check buffer status\n",
+ __func__);
+ rsi_sdio_ack_intr(common->priv,
+ BIT(PKT_BUFF_AVAILABLE));
+ rsi_set_event(&common->tx_thread.event);
+
+ rsi_dbg(ISR_ZONE, "%s: ==> BUFFER_AVAILABLE <==\n",
+ __func__);
+ dev->buff_status_updated = true;
+
+ isr_status &= ~BIT(PKT_BUFF_AVAILABLE);
+ }
+
+ if (isr_status & BIT(FW_ASSERT_IND)) {
+ rsi_dbg(ERR_ZONE, "%s: ==> FIRMWARE Assert <==\n",
+ __func__);
+ status = rsi_sdio_read_register(common->priv,
+ SDIO_FW_STATUS_REG,
+ &fw_status);
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to read f/w reg\n",
+ __func__);
+ } else {
+ rsi_dbg(ERR_ZONE,
+ "%s: Firmware Status is 0x%x\n",
+ __func__, fw_status);
+ rsi_sdio_ack_intr(common->priv,
+ BIT(FW_ASSERT_IND));
+ }
+
+ common->fsm_state = FSM_CARD_NOT_READY;
+
+ isr_status &= ~BIT(FW_ASSERT_IND);
+ }
+
+ if (isr_status & BIT(MSDU_PKT_PENDING)) {
+ rsi_dbg(ISR_ZONE, "Pkt pending interrupt\n");
+ dev->rx_info.total_sdio_msdu_pending_intr++;
+
+ status = rsi_process_pkt(common);
+ if (status) {
+ rsi_dbg(ERR_ZONE, "%s: Failed to read pkt\n",
+ __func__);
+ mutex_unlock(&common->rx_lock);
+ return;
+ }
+
+ isr_status &= ~BIT(MSDU_PKT_PENDING);
+ }
+
+ if (isr_status) {
+ rsi_sdio_ack_intr(common->priv, isr_status);
+ dev->rx_info.total_sdio_unknown_intr++;
+ isr_status = 0;
+ rsi_dbg(ISR_ZONE, "Unknown Interrupt %x\n",
+ isr_status);
+ }
+
+ mutex_unlock(&common->rx_lock);
+ } while (1);
+}
+
+/* This function is used to read buffer status register and
+ * set relevant fields in rsi_91x_sdiodev struct.
+ */
+int rsi_sdio_check_buffer_status(struct rsi_hw *adapter, u8 q_num)
+{
+ struct rsi_common *common = adapter->priv;
+ struct rsi_91x_sdiodev *dev =
+ (struct rsi_91x_sdiodev *)adapter->rsi_dev;
+ u8 buf_status = 0;
+ int status = 0;
+ static int counter = 4;
+
+ if (!dev->buff_status_updated && counter) {
+ counter--;
+ goto out;
+ }
+
+ dev->buff_status_updated = false;
+ status = rsi_sdio_read_register(common->priv,
+ RSI_DEVICE_BUFFER_STATUS_REGISTER,
+ &buf_status);
+
+ if (status) {
+ rsi_dbg(ERR_ZONE,
+ "%s: Failed to read status register\n", __func__);
+ return -1;
+ }
+
+ if (buf_status & (BIT(PKT_MGMT_BUFF_FULL))) {
+ if (!dev->rx_info.mgmt_buffer_full)
+ dev->rx_info.mgmt_buf_full_counter++;
+ dev->rx_info.mgmt_buffer_full = true;
+ } else {
+ dev->rx_info.mgmt_buffer_full = false;
+ }
+
+ if (buf_status & (BIT(PKT_BUFF_FULL))) {
+ if (!dev->rx_info.buffer_full)
+ dev->rx_info.buf_full_counter++;
+ dev->rx_info.buffer_full = true;
+ } else {
+ dev->rx_info.buffer_full = false;
+ }
+
+ if (buf_status & (BIT(PKT_BUFF_SEMI_FULL))) {
+ if (!dev->rx_info.semi_buffer_full)
+ dev->rx_info.buf_semi_full_counter++;
+ dev->rx_info.semi_buffer_full = true;
+ } else {
+ dev->rx_info.semi_buffer_full = false;
+ }
+
+ if (dev->rx_info.mgmt_buffer_full || dev->rx_info.buf_full_counter)
+ counter = 1;
+ else
+ counter = 4;
+
+out:
+ if ((q_num == MGMT_SOFT_Q) && (dev->rx_info.mgmt_buffer_full))
+ return QUEUE_FULL;
+
+ if ((q_num < MGMT_SOFT_Q) && (dev->rx_info.buffer_full))
+ return QUEUE_FULL;
+
+ return QUEUE_NOT_FULL;
+}
+
+/**
+ * rsi_sdio_determine_event_timeout() - This Function determines the event
+ * timeout duration.
+ * @adapter: Pointer to the adapter structure.
+ *
+ * Return: timeout duration is returned.
+ */
+int rsi_sdio_determine_event_timeout(struct rsi_hw *adapter)
+{
+ struct rsi_91x_sdiodev *dev =
+ (struct rsi_91x_sdiodev *)adapter->rsi_dev;
+
+ /* Once buffer full is seen, event timeout to occur every 2 msecs */
+ if (dev->rx_info.buffer_full)
+ return 2;
+
+ return EVENT_WAIT_FOREVER;
+}
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