wfx: get out from the staging area

The wfx driver is now mature enough to leave the staging area.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>

1 files changed, 0 insertions, 324 deletions

diff --git a/drivers/staging/wfx/bh.c b/drivers/staging/wfx/bh.c
deleted file mode 100644
index bcea9d5b119c..000000000000
--- a/drivers/staging/wfx/bh.c
+++ /dev/null
@@ -1,324 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Interrupt bottom half (BH).
- *
- * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
- * Copyright (c) 2010, ST-Ericsson
- */
-#include <linux/gpio/consumer.h>
-#include <net/mac80211.h>
-
-#include "bh.h"
-#include "wfx.h"
-#include "hwio.h"
-#include "traces.h"
-#include "hif_rx.h"
-#include "hif_api_cmd.h"
-
-static void device_wakeup(struct wfx_dev *wdev)
-{
-	int max_retry = 3;
-
-	if (!wdev->pdata.gpio_wakeup)
-		return;
-	if (gpiod_get_value_cansleep(wdev->pdata.gpio_wakeup) > 0)
-		return;
-
-	if (wfx_api_older_than(wdev, 1, 4)) {
-		gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
-		if (!completion_done(&wdev->hif.ctrl_ready))
-			usleep_range(2000, 2500);
-		return;
-	}
-	for (;;) {
-		gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 1);
-		/* completion.h does not provide any function to wait completion without consume it
-		 * (a kind of wait_for_completion_done_timeout()). So we have to emulate it.
-		 */
-		if (wait_for_completion_timeout(&wdev->hif.ctrl_ready, msecs_to_jiffies(2))) {
-			complete(&wdev->hif.ctrl_ready);
-			return;
-		} else if (max_retry-- > 0) {
-			/* Older firmwares have a race in sleep/wake-up process.  Redo the process
-			 * is sufficient to unfreeze the chip.
-			 */
-			dev_err(wdev->dev, "timeout while wake up chip\n");
-			gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
-			usleep_range(2000, 2500);
-		} else {
-			dev_err(wdev->dev, "max wake-up retries reached\n");
-			return;
-		}
-	}
-}
-
-static void device_release(struct wfx_dev *wdev)
-{
-	if (!wdev->pdata.gpio_wakeup)
-		return;
-
-	gpiod_set_value_cansleep(wdev->pdata.gpio_wakeup, 0);
-}
-
-static int rx_helper(struct wfx_dev *wdev, size_t read_len, int *is_cnf)
-{
-	struct sk_buff *skb;
-	struct wfx_hif_msg *hif;
-	size_t alloc_len;
-	size_t computed_len;
-	int release_count;
-	int piggyback = 0;
-
-	WARN(read_len > round_down(0xFFF, 2) * sizeof(u16), "request exceed the chip capability");
-
-	/* Add 2 to take into account piggyback size */
-	alloc_len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, read_len + 2);
-	skb = dev_alloc_skb(alloc_len);
-	if (!skb)
-		return -ENOMEM;
-
-	if (wfx_data_read(wdev, skb->data, alloc_len))
-		goto err;
-
-	piggyback = le16_to_cpup((__le16 *)(skb->data + alloc_len - 2));
-	_trace_piggyback(piggyback, false);
-
-	hif = (struct wfx_hif_msg *)skb->data;
-	WARN(hif->encrypted & 0x3, "encryption is unsupported");
-	if (WARN(read_len < sizeof(struct wfx_hif_msg), "corrupted read"))
-		goto err;
-	computed_len = le16_to_cpu(hif->len);
-	computed_len = round_up(computed_len, 2);
-	if (computed_len != read_len) {
-		dev_err(wdev->dev, "inconsistent message length: %zu != %zu\n",
-			computed_len, read_len);
-		print_hex_dump(KERN_INFO, "hif: ", DUMP_PREFIX_OFFSET, 16, 1,
-			       hif, read_len, true);
-		goto err;
-	}
-
-	if (!(hif->id & HIF_ID_IS_INDICATION)) {
-		(*is_cnf)++;
-		if (hif->id == HIF_CNF_ID_MULTI_TRANSMIT)
-			release_count =
-				((struct wfx_hif_cnf_multi_transmit *)hif->body)->num_tx_confs;
-		else
-			release_count = 1;
-		WARN(wdev->hif.tx_buffers_used < release_count, "corrupted buffer counter");
-		wdev->hif.tx_buffers_used -= release_count;
-	}
-	_trace_hif_recv(hif, wdev->hif.tx_buffers_used);
-
-	if (hif->id != HIF_IND_ID_EXCEPTION && hif->id != HIF_IND_ID_ERROR) {
-		if (hif->seqnum != wdev->hif.rx_seqnum)
-			dev_warn(wdev->dev, "wrong message sequence: %d != %d\n",
-				 hif->seqnum, wdev->hif.rx_seqnum);
-		wdev->hif.rx_seqnum = (hif->seqnum + 1) % (HIF_COUNTER_MAX + 1);
-	}
-
-	skb_put(skb, le16_to_cpu(hif->len));
-	/* wfx_handle_rx takes care on SKB livetime */
-	wfx_handle_rx(wdev, skb);
-	if (!wdev->hif.tx_buffers_used)
-		wake_up(&wdev->hif.tx_buffers_empty);
-
-	return piggyback;
-
-err:
-	if (skb)
-		dev_kfree_skb(skb);
-	return -EIO;
-}
-
-static int bh_work_rx(struct wfx_dev *wdev, int max_msg, int *num_cnf)
-{
-	size_t len;
-	int i;
-	int ctrl_reg, piggyback;
-
-	piggyback = 0;
-	for (i = 0; i < max_msg; i++) {
-		if (piggyback & CTRL_NEXT_LEN_MASK)
-			ctrl_reg = piggyback;
-		else if (try_wait_for_completion(&wdev->hif.ctrl_ready))
-			ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, 0);
-		else
-			ctrl_reg = 0;
-		if (!(ctrl_reg & CTRL_NEXT_LEN_MASK))
-			return i;
-		/* ctrl_reg units are 16bits words */
-		len = (ctrl_reg & CTRL_NEXT_LEN_MASK) * 2;
-		piggyback = rx_helper(wdev, len, num_cnf);
-		if (piggyback < 0)
-			return i;
-		if (!(piggyback & CTRL_WLAN_READY))
-			dev_err(wdev->dev, "unexpected piggyback value: ready bit not set: %04x\n",
-				piggyback);
-	}
-	if (piggyback & CTRL_NEXT_LEN_MASK) {
-		ctrl_reg = atomic_xchg(&wdev->hif.ctrl_reg, piggyback);
-		complete(&wdev->hif.ctrl_ready);
-		if (ctrl_reg)
-			dev_err(wdev->dev, "unexpected IRQ happened: %04x/%04x\n",
-				ctrl_reg, piggyback);
-	}
-	return i;
-}
-
-static void tx_helper(struct wfx_dev *wdev, struct wfx_hif_msg *hif)
-{
-	int ret;
-	void *data;
-	bool is_encrypted = false;
-	size_t len = le16_to_cpu(hif->len);
-
-	WARN(len < sizeof(*hif), "try to send corrupted data");
-
-	hif->seqnum = wdev->hif.tx_seqnum;
-	wdev->hif.tx_seqnum = (wdev->hif.tx_seqnum + 1) % (HIF_COUNTER_MAX + 1);
-
-	data = hif;
-	WARN(len > le16_to_cpu(wdev->hw_caps.size_inp_ch_buf),
-	     "request exceed the chip capability: %zu > %d\n",
-	     len, le16_to_cpu(wdev->hw_caps.size_inp_ch_buf));
-	len = wdev->hwbus_ops->align_size(wdev->hwbus_priv, len);
-	ret = wfx_data_write(wdev, data, len);
-	if (ret)
-		goto end;
-
-	wdev->hif.tx_buffers_used++;
-	_trace_hif_send(hif, wdev->hif.tx_buffers_used);
-end:
-	if (is_encrypted)
-		kfree(data);
-}
-
-static int bh_work_tx(struct wfx_dev *wdev, int max_msg)
-{
-	struct wfx_hif_msg *hif;
-	int i;
-
-	for (i = 0; i < max_msg; i++) {
-		hif = NULL;
-		if (wdev->hif.tx_buffers_used < le16_to_cpu(wdev->hw_caps.num_inp_ch_bufs)) {
-			if (try_wait_for_completion(&wdev->hif_cmd.ready)) {
-				WARN(!mutex_is_locked(&wdev->hif_cmd.lock), "data locking error");
-				hif = wdev->hif_cmd.buf_send;
-			} else {
-				hif = wfx_tx_queues_get(wdev);
-			}
-		}
-		if (!hif)
-			return i;
-		tx_helper(wdev, hif);
-	}
-	return i;
-}
-
-/* In SDIO mode, it is necessary to make an access to a register to acknowledge last received
- * message. It could be possible to restrict this acknowledge to SDIO mode and only if last
- * operation was rx.
- */
-static void ack_sdio_data(struct wfx_dev *wdev)
-{
-	u32 cfg_reg;
-
-	wfx_config_reg_read(wdev, &cfg_reg);
-	if (cfg_reg & 0xFF) {
-		dev_warn(wdev->dev, "chip reports errors: %02x\n", cfg_reg & 0xFF);
-		wfx_config_reg_write_bits(wdev, 0xFF, 0x00);
-	}
-}
-
-static void bh_work(struct work_struct *work)
-{
-	struct wfx_dev *wdev = container_of(work, struct wfx_dev, hif.bh);
-	int stats_req = 0, stats_cnf = 0, stats_ind = 0;
-	bool release_chip = false, last_op_is_rx = false;
-	int num_tx, num_rx;
-
-	device_wakeup(wdev);
-	do {
-		num_tx = bh_work_tx(wdev, 32);
-		stats_req += num_tx;
-		if (num_tx)
-			last_op_is_rx = false;
-		num_rx = bh_work_rx(wdev, 32, &stats_cnf);
-		stats_ind += num_rx;
-		if (num_rx)
-			last_op_is_rx = true;
-	} while (num_rx || num_tx);
-	stats_ind -= stats_cnf;
-
-	if (last_op_is_rx)
-		ack_sdio_data(wdev);
-	if (!wdev->hif.tx_buffers_used && !work_pending(work)) {
-		device_release(wdev);
-		release_chip = true;
-	}
-	_trace_bh_stats(stats_ind, stats_req, stats_cnf, wdev->hif.tx_buffers_used, release_chip);
-}
-
-/* An IRQ from chip did occur */
-void wfx_bh_request_rx(struct wfx_dev *wdev)
-{
-	u32 cur, prev;
-
-	wfx_control_reg_read(wdev, &cur);
-	prev = atomic_xchg(&wdev->hif.ctrl_reg, cur);
-	complete(&wdev->hif.ctrl_ready);
-	queue_work(system_highpri_wq, &wdev->hif.bh);
-
-	if (!(cur & CTRL_NEXT_LEN_MASK))
-		dev_err(wdev->dev, "unexpected control register value: length field is 0: %04x\n",
-			cur);
-	if (prev != 0)
-		dev_err(wdev->dev, "received IRQ but previous data was not (yet) read: %04x/%04x\n",
-			prev, cur);
-}
-
-/* Driver want to send data */
-void wfx_bh_request_tx(struct wfx_dev *wdev)
-{
-	queue_work(system_highpri_wq, &wdev->hif.bh);
-}
-
-/* If IRQ is not available, this function allow to manually poll the control register and simulate
- * an IRQ ahen an event happened.
- *
- * Note that the device has a bug: If an IRQ raise while host read control register, the IRQ is
- * lost. So, use this function carefully (only duing device initialisation).
- */
-void wfx_bh_poll_irq(struct wfx_dev *wdev)
-{
-	ktime_t now, start;
-	u32 reg;
-
-	WARN(!wdev->poll_irq, "unexpected IRQ polling can mask IRQ");
-	flush_workqueue(system_highpri_wq);
-	start = ktime_get();
-	for (;;) {
-		wfx_control_reg_read(wdev, &reg);
-		now = ktime_get();
-		if (reg & 0xFFF)
-			break;
-		if (ktime_after(now, ktime_add_ms(start, 1000))) {
-			dev_err(wdev->dev, "time out while polling control register\n");
-			return;
-		}
-		udelay(200);
-	}
-	wfx_bh_request_rx(wdev);
-}
-
-void wfx_bh_register(struct wfx_dev *wdev)
-{
-	INIT_WORK(&wdev->hif.bh, bh_work);
-	init_completion(&wdev->hif.ctrl_ready);
-	init_waitqueue_head(&wdev->hif.tx_buffers_empty);
-}
-
-void wfx_bh_unregister(struct wfx_dev *wdev)
-{
-	flush_work(&wdev->hif.bh);
-}