/* * This file is part of wl1271 * * Copyright (C) 2008-2009 Nokia Corporation * * Contact: Luciano Coelho * * 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 #include #include #include #include #include #include #include #include #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 /* * only support SPI for 12xx - this code should be reworked when 18xx * support is introduced */ #define SPI_AGGR_BUFFER_SIZE (4 * SZ_4K) /* Maximum number of SPI write chunks */ #define WSPI_MAX_NUM_OF_CHUNKS \ ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1) struct wl12xx_spi_glue { struct device *dev; struct platform_device *core; }; 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; 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); 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 __must_check 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_message m; u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */ u32 *cmd; u32 chunk_len; int i; WARN_ON(len > SPI_AGGR_BUFFER_SIZE); spi_message_init(&m); memset(t, 0, sizeof(t)); 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); return 0; } 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, .set_block_size = NULL, }; 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; memset(&pdev_data, 0x00, sizeof(pdev_data)); /* TODO: add DT parsing when needed */ 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; ret = spi_setup(spi); if (ret < 0) { dev_err(glue->dev, "spi_setup failed\n"); return ret; } glue->core = platform_device_alloc("wl12xx", 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; 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", }, .probe = wl1271_probe, .remove = wl1271_remove, }; module_spi_driver(wl1271_spi_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Luciano Coelho "); MODULE_AUTHOR("Juuso Oikarinen "); MODULE_ALIAS("spi:wl1271");