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wlcore: spi: add wl18xx support
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. - Use inverted chip select for sending a dummy 4 bytes command that completes the init stage. Signed-off-by: Eyal Reizer <eyalr@ti.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Eyal Reizer
Kalle Valo
parent
f823a2aa8f
commit
01efe65aba
@ -1,19 +1,30 @@
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* Texas Instruments wl1271 wireless lan controller
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* Texas Instruments wl12xx/wl18xx wireless lan controller
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The wl1271 chip can be connected via SPI or via SDIO. This
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The wl12xx/wl18xx chips can be connected via SPI or via SDIO. This
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document describes the binding for the SPI connected chip.
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Required properties:
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- compatible : Should be "ti,wl1271"
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- compatible : Should be one of the following:
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* "ti,wl1271"
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* "ti,wl1273"
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* "ti,wl1281"
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* "ti,wl1283"
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* "ti,wl1801"
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* "ti,wl1805"
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* "ti,wl1807"
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* "ti,wl1831"
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* "ti,wl1835"
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* "ti,wl1837"
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- reg : Chip select address of device
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- spi-max-frequency : Maximum SPI clocking speed of device in Hz
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- ref-clock-frequency : Reference clock frequency
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- interrupt-parent, interrupts :
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Should contain parameters for 1 interrupt line.
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Interrupt parameters: parent, line number, type.
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- vwlan-supply : Point the node of the regulator that powers/enable the wl1271 chip
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- vwlan-supply : Point the node of the regulator that powers/enable the
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wl12xx/wl18xx chip
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Optional properties:
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- ref-clock-frequency : Reference clock frequency (should be set for wl12xx)
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- clock-xtal : boolean, clock is generated from XTAL
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- Please consult Documentation/devicetree/bindings/spi/spi-bus.txt
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@ -21,16 +32,28 @@ Optional properties:
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Examples:
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For wl12xx family:
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&spi1 {
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wl1271@1 {
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wlcore: wlcore@1 {
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compatible = "ti,wl1271";
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reg = <1>;
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spi-max-frequency = <48000000>;
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clock-xtal;
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ref-clock-frequency = <38400000>;
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interrupt-parent = <&gpio3>;
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interrupts = <8 IRQ_TYPE_LEVEL_HIGH>;
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vwlan-supply = <&vwlan_fixed>;
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clock-xtal;
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ref-clock-frequency = <38400000>;
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};
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};
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For wl18xx family:
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&spi0 {
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wlcore: wlcore@0 {
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compatible = "ti,wl1835";
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reg = <0>;
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spi-max-frequency = <48000000>;
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interrupt-parent = <&gpio0>;
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interrupts = <27 IRQ_TYPE_EDGE_RISING>;
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vwlan-supply = <&vwlan_fixed>;
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};
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};
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@ -70,16 +70,30 @@
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#define WSPI_MAX_CHUNK_SIZE 4092
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/*
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* only support SPI for 12xx - this code should be reworked when 18xx
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* support is introduced
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* wl18xx driver aggregation buffer size is (13 * PAGE_SIZE) compared to
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* (4 * PAGE_SIZE) for wl12xx, so use the larger buffer needed for wl18xx
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*/
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#define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE)
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#define SPI_AGGR_BUFFER_SIZE (13 * PAGE_SIZE)
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/* Maximum number of SPI write chunks */
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#define WSPI_MAX_NUM_OF_CHUNKS \
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((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)
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struct wilink_familiy_data {
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char name[8];
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};
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const struct wilink_familiy_data *wilink_data;
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static const struct wilink_familiy_data wl18xx_data = {
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.name = "wl18xx",
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};
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static const struct wilink_familiy_data wl12xx_data = {
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.name = "wl12xx",
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};
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struct wl12xx_spi_glue {
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struct device *dev;
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struct platform_device *core;
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@ -119,6 +133,7 @@ static void wl12xx_spi_init(struct device *child)
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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struct spi_transfer t;
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struct spi_message m;
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struct spi_device *spi = to_spi_device(glue->dev);
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u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
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if (!cmd) {
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@ -151,6 +166,7 @@ static void wl12xx_spi_init(struct device *child)
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cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
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cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
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/*
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* The above is the logical order; it must actually be stored
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* in the buffer byte-swapped.
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@ -163,6 +179,28 @@ static void wl12xx_spi_init(struct device *child)
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spi_message_add_tail(&t, &m);
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spi_sync(to_spi_device(glue->dev), &m);
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/* Send extra clocks with inverted CS (high). this is required
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* by the wilink family in order to successfully enter WSPI mode.
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*/
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spi->mode ^= SPI_CS_HIGH;
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memset(&m, 0, sizeof(m));
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spi_message_init(&m);
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cmd[0] = 0xff;
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cmd[1] = 0xff;
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cmd[2] = 0xff;
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cmd[3] = 0xff;
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__swab32s((u32 *)cmd);
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t.tx_buf = cmd;
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t.len = 4;
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spi_message_add_tail(&t, &m);
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spi_sync(to_spi_device(glue->dev), &m);
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/* Restore chip select configration to normal */
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spi->mode ^= SPI_CS_HIGH;
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kfree(cmd);
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}
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@ -270,22 +308,25 @@ static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
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return 0;
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}
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static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
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void *buf, size_t len, bool fixed)
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static int __wl12xx_spi_raw_write(struct device *child, int addr,
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void *buf, size_t len, bool fixed)
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{
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
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/* SPI write buffers - 2 for each chunk */
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struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
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struct spi_transfer *t;
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struct spi_message m;
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u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
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u32 *cmd;
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u32 chunk_len;
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int i;
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/* SPI write buffers - 2 for each chunk */
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t = kzalloc(sizeof(*t) * 2 * WSPI_MAX_NUM_OF_CHUNKS, GFP_KERNEL);
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if (!t)
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return -ENOMEM;
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WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
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spi_message_init(&m);
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memset(t, 0, sizeof(t));
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cmd = &commands[0];
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i = 0;
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@ -318,9 +359,26 @@ static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
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spi_sync(to_spi_device(glue->dev), &m);
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kfree(t);
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return 0;
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}
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static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
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void *buf, size_t len, bool fixed)
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{
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int ret;
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/* The ELP wakeup write may fail the first time due to internal
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* hardware latency. It is safer to send the wakeup command twice to
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* avoid unexpected failures.
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*/
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if (addr == HW_ACCESS_ELP_CTRL_REG)
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ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
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ret = __wl12xx_spi_raw_write(child, addr, buf, len, fixed);
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return ret;
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}
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/**
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* wl12xx_spi_set_power - power on/off the wl12xx unit
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* @child: wl12xx device handle.
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@ -349,17 +407,38 @@ static int wl12xx_spi_set_power(struct device *child, bool enable)
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return ret;
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}
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/**
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* wl12xx_spi_set_block_size
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*
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* This function is not needed for spi mode, but need to be present.
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* Without it defined the wlcore fallback to use the wrong packet
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* allignment on tx.
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*/
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static void wl12xx_spi_set_block_size(struct device *child,
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unsigned int blksz)
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{
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}
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static struct wl1271_if_operations spi_ops = {
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.read = wl12xx_spi_raw_read,
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.write = wl12xx_spi_raw_write,
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.reset = wl12xx_spi_reset,
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.init = wl12xx_spi_init,
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.power = wl12xx_spi_set_power,
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.set_block_size = NULL,
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.set_block_size = wl12xx_spi_set_block_size,
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};
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static const struct of_device_id wlcore_spi_of_match_table[] = {
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{ .compatible = "ti,wl1271" },
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{ .compatible = "ti,wl1271", .data = &wl12xx_data},
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{ .compatible = "ti,wl1273", .data = &wl12xx_data},
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{ .compatible = "ti,wl1281", .data = &wl12xx_data},
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{ .compatible = "ti,wl1283", .data = &wl12xx_data},
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{ .compatible = "ti,wl1801", .data = &wl18xx_data},
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{ .compatible = "ti,wl1805", .data = &wl18xx_data},
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{ .compatible = "ti,wl1807", .data = &wl18xx_data},
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{ .compatible = "ti,wl1831", .data = &wl18xx_data},
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{ .compatible = "ti,wl1835", .data = &wl18xx_data},
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{ .compatible = "ti,wl1837", .data = &wl18xx_data},
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{ }
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};
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MODULE_DEVICE_TABLE(of, wlcore_spi_of_match_table);
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@ -376,17 +455,24 @@ static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue,
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{
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struct device_node *dt_node = spi->dev.of_node;
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int ret;
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const struct of_device_id *of_id;
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of_id = of_match_node(wlcore_spi_of_match_table, dt_node);
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if (!of_id)
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return -ENODEV;
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wilink_data = of_id->data;
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dev_info(&spi->dev, "selected chip familiy is %s\n",
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wilink_data->name);
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if (of_find_property(dt_node, "clock-xtal", NULL))
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pdev_data->ref_clock_xtal = true;
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ret = of_property_read_u32(dt_node, "ref-clock-frequency",
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&pdev_data->ref_clock_freq);
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if (ret) {
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dev_err(glue->dev,
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"can't get reference clock frequency (%d)\n", ret);
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return ret;
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}
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/* optional clock frequency params */
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of_property_read_u32(dt_node, "ref-clock-frequency",
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&pdev_data->ref_clock_freq);
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of_property_read_u32(dt_node, "tcxo-clock-frequency",
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&pdev_data->tcxo_clock_freq);
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return 0;
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}
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@ -437,7 +523,8 @@ static int wl1271_probe(struct spi_device *spi)
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return ret;
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}
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glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
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glue->core = platform_device_alloc(wilink_data->name,
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PLATFORM_DEVID_AUTO);
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if (!glue->core) {
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dev_err(glue->dev, "can't allocate platform_device\n");
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return -ENOMEM;
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