diff options
author | Jérôme Pouiller <jerome.pouiller@silabs.com> | 2022-02-26 12:21:42 +0300 |
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committer | Kalle Valo <kvalo@kernel.org> | 2022-04-06 09:52:14 +0300 |
commit | 4a5fb1bbcdf1cccae1f6b9c0277b3796b2a468ef (patch) | |
tree | 73f7dc8e436a7cc61f8a7d270067f9cb46cc1daf /drivers/staging/wfx/bh.c | |
parent | 3123109284176b1532874591f7c81f3837bbdc17 (diff) | |
download | linux-4a5fb1bbcdf1cccae1f6b9c0277b3796b2a468ef.tar.xz |
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>
Diffstat (limited to 'drivers/staging/wfx/bh.c')
-rw-r--r-- | drivers/staging/wfx/bh.c | 324 |
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, ®); - 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); -} |