Return-path: Received: from bear.ext.ti.com ([192.94.94.41]:53586 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751439AbcDJHh3 convert rfc822-to-8bit (ORCPT ); Sun, 10 Apr 2016 03:37:29 -0400 From: "Reizer, Eyal" To: Kalle Valo , Eyal Reizer , "linux-wireless@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" Subject: [PATCHv2] wlcore: spi: add wl18xx support Date: Sun, 10 Apr 2016 07:37:23 +0000 Message-ID: <8665E2433BC68541A24DFFCA87B70F5B360B6C90@DFRE01.ent.ti.com> (sfid-20160410_093811_837643_566E7E85) References: <1460273570-12298-1-git-send-email-eyalr@ti.com> In-Reply-To: <1460273570-12298-1-git-send-email-eyalr@ti.com> Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: 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 { ... cs-gpios = <&gpio0 5 0>; ... wlcore: wlcore@0 { compatible = "ti,wl1835"; ... ... }; }; Signed-off-by: Eyal Reizer --- v1 -> v2: update device tree bindings documentation .../bindings/net/wireless/ti,wlcore,spi.txt | 50 +++++- drivers/net/wireless/ti/wlcore/spi.c | 176 +++++++++++++++++--- 2 files changed, 200 insertions(+), 26 deletions(-) diff --git a/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt index 9180724..912ab0c 100644 --- a/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt +++ b/Documentation/devicetree/bindings/net/wireless/ti,wlcore,spi.txt @@ -1,19 +1,31 @@ -* Texas Instruments wl1271 wireless lan controller +* Texas Instruments wl12xx/wl18xx wireless lan controller -The wl1271 chip can be connected via SPI or via SDIO. This +The wl12xx/wl18xx chips can be connected via SPI or via SDIO. This document describes the binding for the SPI connected chip. Required properties: -- compatible : Should be "ti,wl1271" +- compatible : Should be one of the following: + * "ti,wl1271" + * "ti,wl1273" + * "ti,wl1281" + * "ti,wl1283" + * "ti,wl1801" + * "ti,wl1805" + * "ti,wl1807" + * "ti,wl1831" + * "ti,wl1835" + * "ti,wl1837" - reg : Chip select address of device - spi-max-frequency : Maximum SPI clocking speed of device in Hz -- ref-clock-frequency : Reference clock frequency - interrupt-parent, interrupts : Should contain parameters for 1 interrupt line. Interrupt parameters: parent, line number, type. -- vwlan-supply : Point the node of the regulator that powers/enable the wl1271 chip +- vwlan-supply : Point the node of the regulator that powers/enable the + wl12xx/wl18xx chip +- cs-gpios : GPIO pin used as the spi chip select Optional properties: +- ref-clock-frequency : Reference clock frequency (should be set for wl12xx) - clock-xtal : boolean, clock is generated from XTAL - Please consult Documentation/devicetree/bindings/spi/spi-bus.txt @@ -21,10 +33,16 @@ Optional properties: Examples: +For wl12xx family: &spi1 { - wl1271@1 { + status = "okay"; + pinctrl-names = "default"; + pinctrl-0 = <&spi1_pins>; + cs-gpios = <&gpio0 5 0>; + #address-cells = <1>; + #size-cells = <0>; + wlcore: wlcore@0 { compatible = "ti,wl1271"; - reg = <1>; spi-max-frequency = <48000000>; clock-xtal; @@ -34,3 +52,21 @@ Examples: vwlan-supply = <&vwlan_fixed>; }; }; + +For wl18xx family: +&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>; + interrupt-parent = <&gpio0>; + interrupts = <27 IRQ_TYPE_EDGE_RISING>; + }; +}; diff --git a/drivers/net/wireless/ti/wlcore/spi.c b/drivers/net/wireless/ti/wlcore/spi.c index 020ac1a..fb48a0d 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