Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753391AbcC3NHW (ORCPT ); Wed, 30 Mar 2016 09:07:22 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:33740 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752056AbcC3NHT (ORCPT ); Wed, 30 Mar 2016 09:07:19 -0400 From: Eyal Reizer X-Google-Original-From: Eyal Reizer To: kvalo@codeaurora.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Eyal Reizer Subject: [PATCH] wlcore: spi: add wl18xx support Date: Wed, 30 Mar 2016 16:06:58 +0300 Message-Id: <1459343218-24536-1-git-send-email-eyalr@ti.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10443 Lines: 366 Add support for using with both wl12xx and wl18xx. - all wilink family needs special init command for entering wspi mode. extra clock cycles should be sent after the spi init command while the cs pin is high. - switch to controling the cs pin from the spi driver for achieveing the above. - the selected cs gpio is read from the spi device-tree node using the cs-gpios field and setup as a gpio. - See the example below for specifying the cs gpio using the cs-gpios entry &spi0 { status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&spi0_pins>; cs-gpios = <&gpio0 5 0>; #address-cells = <1>; #size-cells = <0>; wlcore: wlcore@0 { compatible = "ti,wl1835"; vwlan-supply = <&wlan_en_reg>; spi-max-frequency = <48000000>; reg = <0>; /* chip select 0 on spi0, ie spi0.0 */ interrupt-parent = <&gpio0>; interrupts = <27 IRQ_TYPE_EDGE_RISING>; }; }; Signed-off-by: Eyal Reizer --- drivers/net/wireless/ti/wlcore/spi.c | 176 ++++++++++++++++++++++++++++++---- 1 file changed, 157 insertions(+), 19 deletions(-) diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c index 96d9c9d..6c5a369 100644 --- a/drivers/net/wireless/ti/wlcore/spi.c +++ b/drivers/net/wireless/ti/wlcore/spi.c @@ -32,6 +32,7 @@ #include #include #include +#include #include "wlcore.h" #include "wl12xx_80211.h" @@ -70,16 +71,30 @@ #define WSPI_MAX_CHUNK_SIZE 4092 /* - * only support SPI for 12xx - this code should be reworked when 18xx - * support is introduced + * wl18xx driver aggregation buffer size is (13 * PAGE_SIZE) compared to + * (4 * PAGE_SIZE) for wl12xx, so use the larger buffer needed for wl18xx */ -#define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE) +#define SPI_AGGR_BUFFER_SIZE (13 * PAGE_SIZE) /* Maximum number of SPI write chunks */ #define WSPI_MAX_NUM_OF_CHUNKS \ ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1) +struct wilink_familiy_data { + char name[8]; +}; + +const struct wilink_familiy_data *wilink_data; + +static const struct wilink_familiy_data wl18xx_data = { + .name = "wl18xx", +}; + +static const struct wilink_familiy_data wl12xx_data = { + .name = "wl12xx", +}; + struct wl12xx_spi_glue { struct device *dev; struct platform_device *core; @@ -120,6 +135,8 @@ static void wl12xx_spi_init(struct device *child) struct spi_transfer t; struct spi_message m; u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); + struct spi_device *spi = (struct spi_device *)glue->dev; + struct spi_master *master = spi->master; if (!cmd) { dev_err(child->parent, @@ -127,6 +144,15 @@ static void wl12xx_spi_init(struct device *child) return; } + if (!master->cs_gpios) { + dev_err(child->parent, + "spi chip select pin missing in platform data!\n"); + return; + } + + /* Drive CS line low */ + gpio_direction_output(master->cs_gpios[0], 0); + memset(&t, 0, sizeof(t)); spi_message_init(&m); @@ -163,6 +189,26 @@ static void wl12xx_spi_init(struct device *child) spi_message_add_tail(&t, &m); spi_sync(to_spi_device(glue->dev), &m); + + /* Send extra clocks with CS high. this is required by the wilink + * family in order for successfully enter WSPI mode + */ + gpio_direction_output(master->cs_gpios[0], 1); + + 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); + kfree(cmd); } @@ -213,6 +259,16 @@ static int __must_check wl12xx_spi_raw_read(struct device *child, int addr, u32 *busy_buf; u32 *cmd; u32 chunk_len; + struct spi_device *spi = (struct spi_device *)glue->dev; + struct spi_master *master = spi->master; + + if (!master->cs_gpios) { + dev_err(child->parent, + "spi chip select pin missing in platform data!\n"); + return -EINVAL; + } + /* Drive CS line low */ + gpio_direction_output(master->cs_gpios[0], 0); while (len > 0) { chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); @@ -267,25 +323,44 @@ static int __must_check wl12xx_spi_raw_read(struct device *child, int addr, len -= chunk_len; } + /* Drive CS line high */ + gpio_direction_output(master->cs_gpios[0], 1); return 0; } -static int __must_check wl12xx_spi_raw_write(struct device *child, int addr, - void *buf, size_t len, bool fixed) +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); - /* SPI write buffers - 2 for each chunk */ - struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS]; + 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; + struct spi_device *spi = (struct spi_device *)glue->dev; + struct spi_master *master = spi->master; + + if (!master->cs_gpios) { + dev_err(child->parent, + "spi chip select pin missing in platform data!\n"); + return -EINVAL; + } + + /* SPI write buffers - 2 for each chunk */ + t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL); + if (!t) { + dev_err(child->parent, + "could not allocate spi write buffer\n"); + return -ENOMEM; + } + + /* Drive CS line low */ + gpio_direction_output(master->cs_gpios[0], 0); WARN_ON(len > SPI_AGGR_BUFFER_SIZE); spi_message_init(&m); - memset(t, 0, sizeof(t)); cmd = &commands[0]; i = 0; @@ -318,9 +393,29 @@ static int __must_check wl12xx_spi_raw_write(struct device *child, int addr, spi_sync(to_spi_device(glue->dev), &m); + /* Drive CS line high */ + gpio_direction_output(master->cs_gpios[0], 1); + + kfree(t); return 0; } +static int __must_check wl12xx_spi_raw_write(struct device *child, int addr, + void *buf, size_t len, bool fixed) +{ + int ret; + + /* 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) + ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed); + ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed); + + return ret; +} + /** * wl12xx_spi_set_power - power on/off the wl12xx unit * @child: wl12xx device handle. @@ -349,17 +444,38 @@ static int wl12xx_spi_set_power(struct device *child, bool enable) 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 = NULL, + .set_block_size = wl12xx_spi_set_block_size, }; static const struct of_device_id wlcore_spi_of_match_table[] = { - { .compatible = "ti,wl1271" }, + { .compatible = "ti,wl1271", .data = &wl12xx_data}, + { .compatible = "ti,wl1273", .data = &wl12xx_data}, + { .compatible = "ti,wl1281", .data = &wl12xx_data}, + { .compatible = "ti,wl1283", .data = &wl12xx_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); @@ -375,18 +491,24 @@ 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; - int ret; + const struct of_device_id *of_id; + + of_id = of_match_node(wlcore_spi_of_match_table, dt_node); + if (!of_id) + return -ENODEV; + + wilink_data = of_id->data; + dev_info(&spi->dev, "selected chip familiy is %s\n", + wilink_data->name); if (of_find_property(dt_node, "clock-xtal", NULL)) pdev_data->ref_clock_xtal = true; - ret = of_property_read_u32(dt_node, "ref-clock-frequency", - &pdev_data->ref_clock_freq); - if (IS_ERR_VALUE(ret)) { - dev_err(glue->dev, - "can't get reference clock frequency (%d)\n", ret); - return ret; - } + /* 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; } @@ -397,6 +519,7 @@ static int wl1271_probe(struct spi_device *spi) struct wlcore_platdev_data pdev_data; struct resource res[1]; int ret; + struct spi_master *master = spi->master; memset(&pdev_data, 0x00, sizeof(pdev_data)); @@ -410,6 +533,12 @@ static int wl1271_probe(struct spi_device *spi) glue->dev = &spi->dev; + if (!master->cs_gpios) { + dev_err(glue->dev, + "spi chip select pin missing in platform data!\n"); + return -EINVAL; + } + spi_set_drvdata(spi, glue); /* This is the only SPI value that we need to set here, the rest @@ -431,15 +560,21 @@ static int wl1271_probe(struct spi_device *spi) return ret; } + if (gpio_request(master->cs_gpios[0], "spi1-cs0")) + return -EINVAL; + ret = spi_setup(spi); if (ret < 0) { dev_err(glue->dev, "spi_setup failed\n"); + gpio_free(master->cs_gpios[0]); return ret; } - glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO); + glue->core = platform_device_alloc(wilink_data->name, + PLATFORM_DEVID_AUTO); if (!glue->core) { dev_err(glue->dev, "can't allocate platform_device\n"); + gpio_free(master->cs_gpios[0]); return -ENOMEM; } @@ -474,14 +609,17 @@ static int wl1271_probe(struct spi_device *spi) out_dev_put: platform_device_put(glue->core); + gpio_free(master->cs_gpios[0]); return ret; } static int wl1271_remove(struct spi_device *spi) { struct wl12xx_spi_glue *glue = spi_get_drvdata(spi); + struct spi_master *master = spi->master; platform_device_unregister(glue->core); + gpio_free(master->cs_gpios[0]); return 0; } -- 1.7.9.5