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575 lines
14 KiB
575 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* This file is part of wl1271 |
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* |
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* Copyright (C) 2008-2009 Nokia Corporation |
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* |
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* Contact: Luciano Coelho <[email protected]> |
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*/ |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/swab.h> |
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#include <linux/crc7.h> |
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#include <linux/spi/spi.h> |
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#include <linux/wl12xx.h> |
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#include <linux/platform_device.h> |
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#include <linux/of_irq.h> |
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#include <linux/regulator/consumer.h> |
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#include "wlcore.h" |
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#include "wl12xx_80211.h" |
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#include "io.h" |
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#define WSPI_CMD_READ 0x40000000 |
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#define WSPI_CMD_WRITE 0x00000000 |
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#define WSPI_CMD_FIXED 0x20000000 |
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#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000 |
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#define WSPI_CMD_BYTE_LENGTH_OFFSET 17 |
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#define WSPI_CMD_BYTE_ADDR 0x0001FFFF |
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#define WSPI_INIT_CMD_CRC_LEN 5 |
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#define WSPI_INIT_CMD_START 0x00 |
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#define WSPI_INIT_CMD_TX 0x40 |
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/* the extra bypass bit is sampled by the TNET as '1' */ |
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#define WSPI_INIT_CMD_BYPASS_BIT 0x80 |
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#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07 |
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#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80 |
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#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00 |
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#define WSPI_INIT_CMD_IOD 0x40 |
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#define WSPI_INIT_CMD_IP 0x20 |
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#define WSPI_INIT_CMD_CS 0x10 |
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#define WSPI_INIT_CMD_WS 0x08 |
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#define WSPI_INIT_CMD_WSPI 0x01 |
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#define WSPI_INIT_CMD_END 0x01 |
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#define WSPI_INIT_CMD_LEN 8 |
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#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \ |
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((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32)) |
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#define HW_ACCESS_WSPI_INIT_CMD_MASK 0 |
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/* HW limitation: maximum possible chunk size is 4095 bytes */ |
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#define WSPI_MAX_CHUNK_SIZE 4092 |
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/* |
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* wl18xx driver aggregation buffer size is (13 * 4K) compared to |
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* (4 * 4K) for wl12xx, so use the larger buffer needed for wl18xx |
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*/ |
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#define SPI_AGGR_BUFFER_SIZE (13 * SZ_4K) |
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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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static const struct wilink_family_data wl127x_data = { |
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.name = "wl127x", |
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.nvs_name = "ti-connectivity/wl127x-nvs.bin", |
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}; |
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static const struct wilink_family_data wl128x_data = { |
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.name = "wl128x", |
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.nvs_name = "ti-connectivity/wl128x-nvs.bin", |
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}; |
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static const struct wilink_family_data wl18xx_data = { |
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.name = "wl18xx", |
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.cfg_name = "ti-connectivity/wl18xx-conf.bin", |
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.nvs_name = "ti-connectivity/wl1271-nvs.bin", |
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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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struct regulator *reg; /* Power regulator */ |
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}; |
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static void wl12xx_spi_reset(struct device *child) |
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{ |
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); |
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u8 *cmd; |
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struct spi_transfer t; |
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struct spi_message m; |
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cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); |
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if (!cmd) { |
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dev_err(child->parent, |
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"could not allocate cmd for spi reset\n"); |
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return; |
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} |
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memset(&t, 0, sizeof(t)); |
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spi_message_init(&m); |
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memset(cmd, 0xff, WSPI_INIT_CMD_LEN); |
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t.tx_buf = cmd; |
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t.len = WSPI_INIT_CMD_LEN; |
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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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kfree(cmd); |
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} |
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static void wl12xx_spi_init(struct device *child) |
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{ |
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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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dev_err(child->parent, |
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"could not allocate cmd for spi init\n"); |
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return; |
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} |
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memset(&t, 0, sizeof(t)); |
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spi_message_init(&m); |
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/* |
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* Set WSPI_INIT_COMMAND |
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* the data is being send from the MSB to LSB |
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*/ |
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cmd[0] = 0xff; |
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cmd[1] = 0xff; |
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cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; |
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cmd[3] = 0; |
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cmd[4] = 0; |
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cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3; |
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cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; |
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cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS |
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| WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; |
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if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) |
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cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; |
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else |
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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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*/ |
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__swab32s((u32 *)cmd); |
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__swab32s((u32 *)cmd+1); |
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t.tx_buf = cmd; |
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t.len = WSPI_INIT_CMD_LEN; |
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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 configuration 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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#define WL1271_BUSY_WORD_TIMEOUT 1000 |
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static int wl12xx_spi_read_busy(struct device *child) |
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{ |
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); |
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struct wl1271 *wl = dev_get_drvdata(child); |
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struct spi_transfer t[1]; |
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struct spi_message m; |
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u32 *busy_buf; |
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int num_busy_bytes = 0; |
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/* |
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* Read further busy words from SPI until a non-busy word is |
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* encountered, then read the data itself into the buffer. |
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*/ |
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num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; |
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busy_buf = wl->buffer_busyword; |
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while (num_busy_bytes) { |
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num_busy_bytes--; |
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spi_message_init(&m); |
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memset(t, 0, sizeof(t)); |
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t[0].rx_buf = busy_buf; |
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t[0].len = sizeof(u32); |
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t[0].cs_change = true; |
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spi_message_add_tail(&t[0], &m); |
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spi_sync(to_spi_device(glue->dev), &m); |
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if (*busy_buf & 0x1) |
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return 0; |
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} |
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/* The SPI bus is unresponsive, the read failed. */ |
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dev_err(child->parent, "SPI read busy-word timeout!\n"); |
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return -ETIMEDOUT; |
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} |
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static int __must_check wl12xx_spi_raw_read(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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struct wl1271 *wl = dev_get_drvdata(child); |
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struct spi_transfer t[2]; |
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struct spi_message m; |
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u32 *busy_buf; |
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u32 *cmd; |
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u32 chunk_len; |
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while (len > 0) { |
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chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); |
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cmd = &wl->buffer_cmd; |
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busy_buf = wl->buffer_busyword; |
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*cmd = 0; |
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*cmd |= WSPI_CMD_READ; |
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*cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & |
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WSPI_CMD_BYTE_LENGTH; |
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*cmd |= addr & WSPI_CMD_BYTE_ADDR; |
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if (fixed) |
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*cmd |= WSPI_CMD_FIXED; |
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spi_message_init(&m); |
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memset(t, 0, sizeof(t)); |
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t[0].tx_buf = cmd; |
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t[0].len = 4; |
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t[0].cs_change = true; |
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spi_message_add_tail(&t[0], &m); |
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/* Busy and non busy words read */ |
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t[1].rx_buf = busy_buf; |
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t[1].len = WL1271_BUSY_WORD_LEN; |
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t[1].cs_change = true; |
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spi_message_add_tail(&t[1], &m); |
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spi_sync(to_spi_device(glue->dev), &m); |
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if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && |
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wl12xx_spi_read_busy(child)) { |
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memset(buf, 0, chunk_len); |
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return 0; |
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} |
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spi_message_init(&m); |
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memset(t, 0, sizeof(t)); |
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t[0].rx_buf = buf; |
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t[0].len = chunk_len; |
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t[0].cs_change = true; |
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spi_message_add_tail(&t[0], &m); |
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spi_sync(to_spi_device(glue->dev), &m); |
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if (!fixed) |
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addr += chunk_len; |
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buf += chunk_len; |
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len -= chunk_len; |
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} |
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return 0; |
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} |
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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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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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cmd = &commands[0]; |
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i = 0; |
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while (len > 0) { |
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chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len); |
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*cmd = 0; |
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*cmd |= WSPI_CMD_WRITE; |
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*cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & |
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WSPI_CMD_BYTE_LENGTH; |
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*cmd |= addr & WSPI_CMD_BYTE_ADDR; |
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if (fixed) |
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*cmd |= WSPI_CMD_FIXED; |
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t[i].tx_buf = cmd; |
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t[i].len = sizeof(*cmd); |
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spi_message_add_tail(&t[i++], &m); |
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t[i].tx_buf = buf; |
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t[i].len = chunk_len; |
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spi_message_add_tail(&t[i++], &m); |
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if (!fixed) |
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addr += chunk_len; |
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buf += chunk_len; |
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len -= chunk_len; |
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cmd++; |
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} |
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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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/* 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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__wl12xx_spi_raw_write(child, addr, buf, len, fixed); |
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return __wl12xx_spi_raw_write(child, addr, buf, len, fixed); |
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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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* @enable: true/false to power on/off the unit. |
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* |
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* use the WiFi enable regulator to enable/disable the WiFi unit. |
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*/ |
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static int wl12xx_spi_set_power(struct device *child, bool enable) |
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{ |
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int ret = 0; |
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struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); |
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WARN_ON(!glue->reg); |
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/* Update regulator state */ |
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if (enable) { |
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ret = regulator_enable(glue->reg); |
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if (ret) |
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dev_err(child, "Power enable failure\n"); |
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} else { |
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ret = regulator_disable(glue->reg); |
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if (ret) |
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dev_err(child, "Power disable failure\n"); |
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} |
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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 = 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", .data = &wl127x_data}, |
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{ .compatible = "ti,wl1273", .data = &wl127x_data}, |
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{ .compatible = "ti,wl1281", .data = &wl128x_data}, |
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{ .compatible = "ti,wl1283", .data = &wl128x_data}, |
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{ .compatible = "ti,wl1285", .data = &wl128x_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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/** |
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* wlcore_probe_of - DT node parsing. |
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* @spi: SPI slave device parameters. |
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* @glue: wl12xx SPI bus to slave device glue parameters. |
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* @pdev_data: wlcore device parameters |
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*/ |
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static int wlcore_probe_of(struct spi_device *spi, struct wl12xx_spi_glue *glue, |
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struct wlcore_platdev_data *pdev_data) |
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{ |
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struct device_node *dt_node = spi->dev.of_node; |
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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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pdev_data->family = of_id->data; |
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dev_info(&spi->dev, "selected chip family is %s\n", |
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pdev_data->family->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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/* 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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static int wl1271_probe(struct spi_device *spi) |
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{ |
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struct wl12xx_spi_glue *glue; |
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struct wlcore_platdev_data *pdev_data; |
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struct resource res[1]; |
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int ret; |
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pdev_data = devm_kzalloc(&spi->dev, sizeof(*pdev_data), GFP_KERNEL); |
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if (!pdev_data) |
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return -ENOMEM; |
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pdev_data->if_ops = &spi_ops; |
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glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL); |
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if (!glue) { |
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dev_err(&spi->dev, "can't allocate glue\n"); |
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return -ENOMEM; |
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} |
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glue->dev = &spi->dev; |
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spi_set_drvdata(spi, glue); |
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/* This is the only SPI value that we need to set here, the rest |
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* comes from the board-peripherals file */ |
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spi->bits_per_word = 32; |
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glue->reg = devm_regulator_get(&spi->dev, "vwlan"); |
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if (PTR_ERR(glue->reg) == -EPROBE_DEFER) |
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return -EPROBE_DEFER; |
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if (IS_ERR(glue->reg)) { |
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dev_err(glue->dev, "can't get regulator\n"); |
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return PTR_ERR(glue->reg); |
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} |
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ret = wlcore_probe_of(spi, glue, pdev_data); |
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if (ret) { |
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dev_err(glue->dev, |
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"can't get device tree parameters (%d)\n", ret); |
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return ret; |
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} |
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ret = spi_setup(spi); |
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if (ret < 0) { |
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dev_err(glue->dev, "spi_setup failed\n"); |
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return ret; |
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} |
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glue->core = platform_device_alloc(pdev_data->family->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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} |
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glue->core->dev.parent = &spi->dev; |
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memset(res, 0x00, sizeof(res)); |
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res[0].start = spi->irq; |
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res[0].flags = IORESOURCE_IRQ | irq_get_trigger_type(spi->irq); |
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res[0].name = "irq"; |
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ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res)); |
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if (ret) { |
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dev_err(glue->dev, "can't add resources\n"); |
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goto out_dev_put; |
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} |
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ret = platform_device_add_data(glue->core, pdev_data, |
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sizeof(*pdev_data)); |
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if (ret) { |
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dev_err(glue->dev, "can't add platform data\n"); |
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goto out_dev_put; |
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} |
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ret = platform_device_add(glue->core); |
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if (ret) { |
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dev_err(glue->dev, "can't register platform device\n"); |
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goto out_dev_put; |
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} |
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|
|
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 <[email protected]>"); |
|
MODULE_AUTHOR("Juuso Oikarinen <[email protected]>"); |
|
MODULE_ALIAS("spi:wl1271");
|
|
|