diff options
Diffstat (limited to 'drivers/net/wireless/ti/wlcore/spi.c')
-rw-r--r-- | drivers/net/wireless/ti/wlcore/spi.c | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c new file mode 100644 index 0000000..62ce54a --- /dev/null +++ b/drivers/net/wireless/ti/wlcore/spi.c @@ -0,0 +1,590 @@ +/* + * This file is part of wl1271 + * + * Copyright (C) 2008-2009 Nokia Corporation + * + * Contact: Luciano Coelho <luciano.coelho@nokia.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/swab.h> +#include <linux/crc7.h> +#include <linux/spi/spi.h> +#include <linux/wl12xx.h> +#include <linux/platform_device.h> +#include <linux/of_irq.h> +#include <linux/regulator/consumer.h> + +#include "wlcore.h" +#include "wl12xx_80211.h" +#include "io.h" + +#define WSPI_CMD_READ 0x40000000 +#define WSPI_CMD_WRITE 0x00000000 +#define WSPI_CMD_FIXED 0x20000000 +#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000 +#define WSPI_CMD_BYTE_LENGTH_OFFSET 17 +#define WSPI_CMD_BYTE_ADDR 0x0001FFFF + +#define WSPI_INIT_CMD_CRC_LEN 5 + +#define WSPI_INIT_CMD_START 0x00 +#define WSPI_INIT_CMD_TX 0x40 +/* the extra bypass bit is sampled by the TNET as '1' */ +#define WSPI_INIT_CMD_BYPASS_BIT 0x80 +#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07 +#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80 +#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00 +#define WSPI_INIT_CMD_IOD 0x40 +#define WSPI_INIT_CMD_IP 0x20 +#define WSPI_INIT_CMD_CS 0x10 +#define WSPI_INIT_CMD_WS 0x08 +#define WSPI_INIT_CMD_WSPI 0x01 +#define WSPI_INIT_CMD_END 0x01 + +#define WSPI_INIT_CMD_LEN 8 + +#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \ + ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32)) +#define HW_ACCESS_WSPI_INIT_CMD_MASK 0 + +/* HW limitation: maximum possible chunk size is 4095 bytes */ +#define WSPI_MAX_CHUNK_SIZE 4092 + +/* + * wl18xx driver aggregation buffer size is (13 * 4K) compared to + * (4 * 4K) for wl12xx, so use the larger buffer needed for wl18xx + */ +#define SPI_AGGR_BUFFER_SIZE (13 * SZ_4K) + +/* Maximum number of SPI write chunks */ +#define WSPI_MAX_NUM_OF_CHUNKS \ + ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1) + +static const struct wilink_family_data wl127x_data = { + .name = "wl127x", + .nvs_name = "ti-connectivity/wl127x-nvs.bin", +}; + +static const struct wilink_family_data wl128x_data = { + .name = "wl128x", + .nvs_name = "ti-connectivity/wl128x-nvs.bin", +}; + +static const struct wilink_family_data wl18xx_data = { + .name = "wl18xx", + .cfg_name = "ti-connectivity/wl18xx-conf.bin", + .nvs_name = "ti-connectivity/wl1271-nvs.bin", +}; + +struct wl12xx_spi_glue { + struct device *dev; + struct platform_device *core; + struct regulator *reg; /* Power regulator */ +}; + +static void wl12xx_spi_reset(struct device *child) +{ + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + u8 *cmd; + struct spi_transfer t; + struct spi_message m; + + cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); + if (!cmd) { + dev_err(child->parent, + "could not allocate cmd for spi reset\n"); + return; + } + + memset(&t, 0, sizeof(t)); + spi_message_init(&m); + + memset(cmd, 0xff, WSPI_INIT_CMD_LEN); + + t.tx_buf = cmd; + t.len = WSPI_INIT_CMD_LEN; + spi_message_add_tail(&t, &m); + + spi_sync(to_spi_device(glue->dev), &m); + + kfree(cmd); +} + +static void wl12xx_spi_init(struct device *child) +{ + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + struct spi_transfer t; + struct spi_message m; + struct spi_device *spi = to_spi_device(glue->dev); + u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); + + if (!cmd) { + dev_err(child->parent, + "could not allocate cmd for spi init\n"); + return; + } + + memset(&t, 0, sizeof(t)); + spi_message_init(&m); + + /* + * Set WSPI_INIT_COMMAND + * the data is being send from the MSB to LSB + */ + cmd[0] = 0xff; + cmd[1] = 0xff; + cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; + cmd[3] = 0; + cmd[4] = 0; + cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3; + cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; + + cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS + | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; + + if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) + cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; + else + cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY; + + cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END; + + /* + * The above is the logical order; it must actually be stored + * in the buffer byte-swapped. + */ + __swab32s((u32 *)cmd); + __swab32s((u32 *)cmd+1); + + t.tx_buf = cmd; + t.len = WSPI_INIT_CMD_LEN; + spi_message_add_tail(&t, &m); + + spi_sync(to_spi_device(glue->dev), &m); + + /* Send extra clocks with inverted CS (high). this is required + * by the wilink family in order to successfully enter WSPI mode. + */ + spi->mode ^= SPI_CS_HIGH; + memset(&m, 0, sizeof(m)); + spi_message_init(&m); + + cmd[0] = 0xff; + cmd[1] = 0xff; + cmd[2] = 0xff; + cmd[3] = 0xff; + __swab32s((u32 *)cmd); + + t.tx_buf = cmd; + t.len = 4; + spi_message_add_tail(&t, &m); + + spi_sync(to_spi_device(glue->dev), &m); + + /* Restore chip select configration to normal */ + spi->mode ^= SPI_CS_HIGH; + kfree(cmd); +} + +#define WL1271_BUSY_WORD_TIMEOUT 1000 + +static int wl12xx_spi_read_busy(struct device *child) +{ + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + struct wl1271 *wl = dev_get_drvdata(child); + struct spi_transfer t[1]; + struct spi_message m; + u32 *busy_buf; + int num_busy_bytes = 0; + + /* + * Read further busy words from SPI until a non-busy word is + * encountered, then read the data itself into the buffer. + */ + + num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; + busy_buf = wl->buffer_busyword; + while (num_busy_bytes) { + num_busy_bytes--; + spi_message_init(&m); + memset(t, 0, sizeof(t)); + t[0].rx_buf = busy_buf; + t[0].len = sizeof(u32); + t[0].cs_change = true; + spi_message_add_tail(&t[0], &m); + spi_sync(to_spi_device(glue->dev), &m); + + if (*busy_buf & 0x1) + return 0; + } + + /* The SPI bus is unresponsive, the read failed. */ + dev_err(child->parent, "SPI read busy-word timeout!\n"); + return -ETIMEDOUT; +} + +static int __must_check wl12xx_spi_raw_read(struct device *child, int addr, + void *buf, size_t len, bool fixed) +{ + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + struct wl1271 *wl = dev_get_drvdata(child); + struct spi_transfer t[2]; + struct spi_message m; + u32 *busy_buf; + u32 *cmd; + u32 chunk_len; + + while (len > 0) { + chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); + + cmd = &wl->buffer_cmd; + busy_buf = wl->buffer_busyword; + + *cmd = 0; + *cmd |= WSPI_CMD_READ; + *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & + WSPI_CMD_BYTE_LENGTH; + *cmd |= addr & WSPI_CMD_BYTE_ADDR; + + if (fixed) + *cmd |= WSPI_CMD_FIXED; + + spi_message_init(&m); + memset(t, 0, sizeof(t)); + + t[0].tx_buf = cmd; + t[0].len = 4; + t[0].cs_change = true; + spi_message_add_tail(&t[0], &m); + + /* Busy and non busy words read */ + t[1].rx_buf = busy_buf; + t[1].len = WL1271_BUSY_WORD_LEN; + t[1].cs_change = true; + spi_message_add_tail(&t[1], &m); + + spi_sync(to_spi_device(glue->dev), &m); + + if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && + wl12xx_spi_read_busy(child)) { + memset(buf, 0, chunk_len); + return 0; + } + + spi_message_init(&m); + memset(t, 0, sizeof(t)); + + t[0].rx_buf = buf; + t[0].len = chunk_len; + t[0].cs_change = true; + spi_message_add_tail(&t[0], &m); + + spi_sync(to_spi_device(glue->dev), &m); + + if (!fixed) + addr += chunk_len; + buf += chunk_len; + len -= chunk_len; + } + + return 0; +} + +static int __wl12xx_spi_raw_write(struct device *child, int addr, + void *buf, size_t len, bool fixed) +{ + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + struct spi_transfer *t; + struct spi_message m; + u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */ + u32 *cmd; + u32 chunk_len; + int i; + + /* SPI write buffers - 2 for each chunk */ + t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL); + if (!t) + return -ENOMEM; + + WARN_ON(len > SPI_AGGR_BUFFER_SIZE); + + spi_message_init(&m); + + cmd = &commands[0]; + i = 0; + while (len > 0) { + chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); + + *cmd = 0; + *cmd |= WSPI_CMD_WRITE; + *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & + WSPI_CMD_BYTE_LENGTH; + *cmd |= addr & WSPI_CMD_BYTE_ADDR; + + if (fixed) + *cmd |= WSPI_CMD_FIXED; + + t[i].tx_buf = cmd; + t[i].len = sizeof(*cmd); + spi_message_add_tail(&t[i++], &m); + + t[i].tx_buf = buf; + t[i].len = chunk_len; + spi_message_add_tail(&t[i++], &m); + + if (!fixed) + addr += chunk_len; + buf += chunk_len; + len -= chunk_len; + cmd++; + } + + spi_sync(to_spi_device(glue->dev), &m); + + kfree(t); + return 0; +} + +static int __must_check wl12xx_spi_raw_write(struct device *child, int addr, + void *buf, size_t len, bool fixed) +{ + /* The ELP wakeup write may fail the first time due to internal + * hardware latency. It is safer to send the wakeup command twice to + * avoid unexpected failures. + */ + if (addr == HW_ACCESS_ELP_CTRL_REG) + __wl12xx_spi_raw_write(child, addr, buf, len, fixed); + + return __wl12xx_spi_raw_write(child, addr, buf, len, fixed); +} + +/** + * wl12xx_spi_set_power - power on/off the wl12xx unit + * @child: wl12xx device handle. + * @enable: true/false to power on/off the unit. + * + * use the WiFi enable regulator to enable/disable the WiFi unit. + */ +static int wl12xx_spi_set_power(struct device *child, bool enable) +{ + int ret = 0; + struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); + + WARN_ON(!glue->reg); + + /* Update regulator state */ + if (enable) { + ret = regulator_enable(glue->reg); + if (ret) + dev_err(child, "Power enable failure\n"); + } else { + ret = regulator_disable(glue->reg); + if (ret) + dev_err(child, "Power disable failure\n"); + } + + return ret; +} + +/** + * wl12xx_spi_set_block_size + * + * This function is not needed for spi mode, but need to be present. + * Without it defined the wlcore fallback to use the wrong packet + * allignment on tx. + */ +static void wl12xx_spi_set_block_size(struct device *child, + unsigned int blksz) +{ +} + +static struct wl1271_if_operations spi_ops = { + .read = wl12xx_spi_raw_read, + .write = wl12xx_spi_raw_write, + .reset = wl12xx_spi_reset, + .init = wl12xx_spi_init, + .power = wl12xx_spi_set_power, + .set_block_size = wl12xx_spi_set_block_size, +}; + +static const struct of_device_id wlcore_spi_of_match_table[] = { + { .compatible = "ti,wl1271", .data = &wl127x_data}, + { .compatible = "ti,wl1273", .data = &wl127x_data}, + { .compatible = "ti,wl1281", .data = &wl128x_data}, + { .compatible = "ti,wl1283", .data = &wl128x_data}, + { .compatible = "ti,wl1285", .data = &wl128x_data}, + { .compatible = "ti,wl1801", .data = &wl18xx_data}, + { .compatible = "ti,wl1805", .data = &wl18xx_data}, + { .compatible = "ti,wl1807", .data = &wl18xx_data}, + { .compatible = "ti,wl1831", .data = &wl18xx_data}, + { .compatible = "ti,wl1835", .data = &wl18xx_data}, + { .compatible = "ti,wl1837", .data = &wl18xx_data}, + { } +}; +MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table); + +/** + * wlcore_probe_of - DT node parsing. + * @spi: SPI slave device parameters. + * @res: resource parameters. + * @glue: wl12xx SPI bus to slave device glue parameters. + * @pdev_data: wlcore device parameters + */ +static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue, + struct wlcore_platdev_data *pdev_data) +{ + struct device_node *dt_node = spi->dev.of_node; + const struct of_device_id *of_id; + + of_id = of_match_node(wlcore_spi_of_match_table, dt_node); + if (!of_id) + return -ENODEV; + + pdev_data->family = of_id->data; + dev_info(&spi->dev, "selected chip family is %s\n", + pdev_data->family->name); + + if (of_find_property(dt_node, "clock-xtal", NULL)) + pdev_data->ref_clock_xtal = true; + + /* optional clock frequency params */ + of_property_read_u32(dt_node, "ref-clock-frequency", + &pdev_data->ref_clock_freq); + of_property_read_u32(dt_node, "tcxo-clock-frequency", + &pdev_data->tcxo_clock_freq); + + return 0; +} + +static int wl1271_probe(struct spi_device *spi) +{ + struct wl12xx_spi_glue *glue; + struct wlcore_platdev_data *pdev_data; + struct resource res[1]; + int ret; + + pdev_data = devm_kzalloc(&spi->dev, sizeof(*pdev_data), GFP_KERNEL); + if (!pdev_data) + return -ENOMEM; + + pdev_data->if_ops = &spi_ops; + + glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL); + if (!glue) { + dev_err(&spi->dev, "can't allocate glue\n"); + return -ENOMEM; + } + + glue->dev = &spi->dev; + + spi_set_drvdata(spi, glue); + + /* This is the only SPI value that we need to set here, the rest + * comes from the board-peripherals file */ + spi->bits_per_word = 32; + + glue->reg = devm_regulator_get(&spi->dev, "vwlan"); + if (PTR_ERR(glue->reg) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (IS_ERR(glue->reg)) { + dev_err(glue->dev, "can't get regulator\n"); + return PTR_ERR(glue->reg); + } + + ret = wlcore_probe_of(spi, glue, pdev_data); + if (ret) { + dev_err(glue->dev, + "can't get device tree parameters (%d)\n", ret); + return ret; + } + + ret = spi_setup(spi); + if (ret < 0) { + dev_err(glue->dev, "spi_setup failed\n"); + return ret; + } + + glue->core = platform_device_alloc(pdev_data->family->name, + PLATFORM_DEVID_AUTO); + if (!glue->core) { + dev_err(glue->dev, "can't allocate platform_device\n"); + return -ENOMEM; + } + + glue->core->dev.parent = &spi->dev; + + memset(res, 0x00, sizeof(res)); + + res[0].start = spi->irq; + res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq); + res[0].name = "irq"; + + ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res)); + if (ret) { + dev_err(glue->dev, "can't add resources\n"); + goto out_dev_put; + } + + ret = platform_device_add_data(glue->core, pdev_data, + sizeof(*pdev_data)); + if (ret) { + dev_err(glue->dev, "can't add platform data\n"); + goto out_dev_put; + } + + ret = platform_device_add(glue->core); + if (ret) { + dev_err(glue->dev, "can't register platform device\n"); + goto out_dev_put; + } + + return 0; + +out_dev_put: + platform_device_put(glue->core); + return ret; +} + +static int wl1271_remove(struct spi_device *spi) +{ + struct wl12xx_spi_glue *glue = spi_get_drvdata(spi); + + platform_device_unregister(glue->core); + + return 0; +} + +static struct spi_driver wl1271_spi_driver = { + .driver = { + .name = "wl1271_spi", + .of_match_table = of_match_ptr(wlcore_spi_of_match_table), + }, + + .probe = wl1271_probe, + .remove = wl1271_remove, +}; + +module_spi_driver(wl1271_spi_driver); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>"); +MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>"); +MODULE_ALIAS("spi:wl1271"); |