diff options
Diffstat (limited to 'drivers/staging/wfx/bus_spi.c')
| -rw-r--r-- | drivers/staging/wfx/bus_spi.c | 271 |
1 files changed, 0 insertions, 271 deletions
diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c deleted file mode 100644 index 55ffcd7c42e2..000000000000 --- a/drivers/staging/wfx/bus_spi.c +++ /dev/null @@ -1,271 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * SPI interface. - * - * Copyright (c) 2017-2020, Silicon Laboratories, Inc. - * Copyright (c) 2011, Sagrad Inc. - * Copyright (c) 2010, ST-Ericsson - */ -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/gpio/consumer.h> -#include <linux/spi/spi.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/of.h> - -#include "bus.h" -#include "wfx.h" -#include "hwio.h" -#include "main.h" -#include "bh.h" - -#define SET_WRITE 0x7FFF /* usage: and operation */ -#define SET_READ 0x8000 /* usage: or operation */ - -#define WFX_RESET_INVERTED 1 - -static const struct wfx_platform_data wfx_spi_pdata = { - .file_fw = "wfm_wf200", - .file_pds = "wf200.pds", - .use_rising_clk = true, -}; - -struct wfx_spi_priv { - struct spi_device *func; - struct wfx_dev *core; - struct gpio_desc *gpio_reset; - bool need_swab; -}; - -/* The chip reads 16bits of data at time and place them directly into (little - * endian) CPU register. So, the chip expects bytes order to be "B1 B0 B3 B2" - * (while LE is "B0 B1 B2 B3" and BE is "B3 B2 B1 B0") - * - * A little endian host with bits_per_word == 16 should do the right job - * natively. The code below to support big endian host and commonly used SPI - * 8bits. - */ -static int wfx_spi_copy_from_io(void *priv, unsigned int addr, - void *dst, size_t count) -{ - struct wfx_spi_priv *bus = priv; - u16 regaddr = (addr << 12) | (count / 2) | SET_READ; - struct spi_message m; - struct spi_transfer t_addr = { - .tx_buf = ®addr, - .len = sizeof(regaddr), - }; - struct spi_transfer t_msg = { - .rx_buf = dst, - .len = count, - }; - u16 *dst16 = dst; - int ret, i; - - WARN(count % 2, "buffer size must be a multiple of 2"); - - cpu_to_le16s(®addr); - if (bus->need_swab) - swab16s(®addr); - - spi_message_init(&m); - spi_message_add_tail(&t_addr, &m); - spi_message_add_tail(&t_msg, &m); - ret = spi_sync(bus->func, &m); - - if (bus->need_swab && addr == WFX_REG_CONFIG) - for (i = 0; i < count / 2; i++) - swab16s(&dst16[i]); - return ret; -} - -static int wfx_spi_copy_to_io(void *priv, unsigned int addr, - const void *src, size_t count) -{ - struct wfx_spi_priv *bus = priv; - u16 regaddr = (addr << 12) | (count / 2); - /* FIXME: use a bounce buffer */ - u16 *src16 = (void *)src; - int ret, i; - struct spi_message m; - struct spi_transfer t_addr = { - .tx_buf = ®addr, - .len = sizeof(regaddr), - }; - struct spi_transfer t_msg = { - .tx_buf = src, - .len = count, - }; - - WARN(count % 2, "buffer size must be a multiple of 2"); - WARN(regaddr & SET_READ, "bad addr or size overflow"); - - cpu_to_le16s(®addr); - - /* Register address and CONFIG content always use 16bit big endian - * ("BADC" order) - */ - if (bus->need_swab) - swab16s(®addr); - if (bus->need_swab && addr == WFX_REG_CONFIG) - for (i = 0; i < count / 2; i++) - swab16s(&src16[i]); - - spi_message_init(&m); - spi_message_add_tail(&t_addr, &m); - spi_message_add_tail(&t_msg, &m); - ret = spi_sync(bus->func, &m); - - if (bus->need_swab && addr == WFX_REG_CONFIG) - for (i = 0; i < count / 2; i++) - swab16s(&src16[i]); - return ret; -} - -static void wfx_spi_lock(void *priv) -{ -} - -static void wfx_spi_unlock(void *priv) -{ -} - -static irqreturn_t wfx_spi_irq_handler(int irq, void *priv) -{ - struct wfx_spi_priv *bus = priv; - - wfx_bh_request_rx(bus->core); - return IRQ_HANDLED; -} - -static int wfx_spi_irq_subscribe(void *priv) -{ - struct wfx_spi_priv *bus = priv; - u32 flags; - - flags = irq_get_trigger_type(bus->func->irq); - if (!flags) - flags = IRQF_TRIGGER_HIGH; - flags |= IRQF_ONESHOT; - return devm_request_threaded_irq(&bus->func->dev, bus->func->irq, NULL, - wfx_spi_irq_handler, IRQF_ONESHOT, - "wfx", bus); -} - -static int wfx_spi_irq_unsubscribe(void *priv) -{ - struct wfx_spi_priv *bus = priv; - - devm_free_irq(&bus->func->dev, bus->func->irq, bus); - return 0; -} - -static size_t wfx_spi_align_size(void *priv, size_t size) -{ - /* Most of SPI controllers avoid DMA if buffer size is not 32bit aligned - */ - return ALIGN(size, 4); -} - -static const struct hwbus_ops wfx_spi_hwbus_ops = { - .copy_from_io = wfx_spi_copy_from_io, - .copy_to_io = wfx_spi_copy_to_io, - .irq_subscribe = wfx_spi_irq_subscribe, - .irq_unsubscribe = wfx_spi_irq_unsubscribe, - .lock = wfx_spi_lock, - .unlock = wfx_spi_unlock, - .align_size = wfx_spi_align_size, -}; - -static int wfx_spi_probe(struct spi_device *func) -{ - struct wfx_spi_priv *bus; - int ret; - - if (!func->bits_per_word) - func->bits_per_word = 16; - ret = spi_setup(func); - if (ret) - return ret; - /* Trace below is also displayed by spi_setup() if compiled with DEBUG */ - dev_dbg(&func->dev, "SPI params: CS=%d, mode=%d bits/word=%d speed=%d\n", - func->chip_select, func->mode, func->bits_per_word, - func->max_speed_hz); - if (func->bits_per_word != 16 && func->bits_per_word != 8) - dev_warn(&func->dev, "unusual bits/word value: %d\n", - func->bits_per_word); - if (func->max_speed_hz > 50000000) - dev_warn(&func->dev, "%dHz is a very high speed\n", - func->max_speed_hz); - - bus = devm_kzalloc(&func->dev, sizeof(*bus), GFP_KERNEL); - if (!bus) - return -ENOMEM; - bus->func = func; - if (func->bits_per_word == 8 || IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) - bus->need_swab = true; - spi_set_drvdata(func, bus); - - bus->gpio_reset = devm_gpiod_get_optional(&func->dev, "reset", - GPIOD_OUT_LOW); - if (IS_ERR(bus->gpio_reset)) - return PTR_ERR(bus->gpio_reset); - if (!bus->gpio_reset) { - dev_warn(&func->dev, - "gpio reset is not defined, trying to load firmware anyway\n"); - } else { - gpiod_set_consumer_name(bus->gpio_reset, "wfx reset"); - if (spi_get_device_id(func)->driver_data & WFX_RESET_INVERTED) - gpiod_toggle_active_low(bus->gpio_reset); - gpiod_set_value_cansleep(bus->gpio_reset, 1); - usleep_range(100, 150); - gpiod_set_value_cansleep(bus->gpio_reset, 0); - usleep_range(2000, 2500); - } - - bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata, - &wfx_spi_hwbus_ops, bus); - if (!bus->core) - return -EIO; - - return wfx_probe(bus->core); -} - -static int wfx_spi_remove(struct spi_device *func) -{ - struct wfx_spi_priv *bus = spi_get_drvdata(func); - - wfx_release(bus->core); - return 0; -} - -/* For dynamic driver binding, kernel does not use OF to match driver. It only - * use modalias and modalias is a copy of 'compatible' DT node with vendor - * stripped. - */ -static const struct spi_device_id wfx_spi_id[] = { - { "wfx-spi", WFX_RESET_INVERTED }, - { "wf200", 0 }, - { }, -}; -MODULE_DEVICE_TABLE(spi, wfx_spi_id); - -#ifdef CONFIG_OF -static const struct of_device_id wfx_spi_of_match[] = { - { .compatible = "silabs,wfx-spi", .data = (void *)WFX_RESET_INVERTED }, - { .compatible = "silabs,wf200" }, - { }, -}; -MODULE_DEVICE_TABLE(of, wfx_spi_of_match); -#endif - -struct spi_driver wfx_spi_driver = { - .driver = { - .name = "wfx-spi", - .of_match_table = of_match_ptr(wfx_spi_of_match), - }, - .id_table = wfx_spi_id, - .probe = wfx_spi_probe, - .remove = wfx_spi_remove, -}; |