| /* ////////////////////////////////////////////////////////////////////////// */ |
| /* */ |
| /* Copyright (c) Atmel Corporation. All rights reserved. */ |
| /* */ |
| /* Module Name: wilc_spi.c */ |
| /* */ |
| /* */ |
| /* //////////////////////////////////////////////////////////////////////////// */ |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/fs.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| #include <linux/cdev.h> |
| #include <linux/uaccess.h> |
| #include <linux/device.h> |
| #include <linux/spi/spi.h> |
| #include <linux/of_gpio.h> |
| |
| #include <linux/string.h> |
| #include "wilc_wlan_if.h" |
| #include "wilc_wlan.h" |
| #include "wilc_wfi_netdevice.h" |
| |
| struct wilc_spi { |
| int crc_off; |
| int nint; |
| int has_thrpt_enh; |
| }; |
| |
| static struct wilc_spi g_spi; |
| |
| static int wilc_spi_read(struct wilc *wilc, u32, u8 *, u32); |
| static int wilc_spi_write(struct wilc *wilc, u32, u8 *, u32); |
| |
| /******************************************** |
| * |
| * Crc7 |
| * |
| ********************************************/ |
| |
| static const u8 crc7_syndrome_table[256] = { |
| 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, |
| 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77, |
| 0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26, |
| 0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e, |
| 0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d, |
| 0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45, |
| 0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14, |
| 0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c, |
| 0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b, |
| 0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13, |
| 0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42, |
| 0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a, |
| 0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69, |
| 0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21, |
| 0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70, |
| 0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38, |
| 0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e, |
| 0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36, |
| 0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67, |
| 0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f, |
| 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, |
| 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, |
| 0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55, |
| 0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d, |
| 0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a, |
| 0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52, |
| 0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03, |
| 0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b, |
| 0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28, |
| 0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60, |
| 0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31, |
| 0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79 |
| }; |
| |
| static u8 crc7_byte(u8 crc, u8 data) |
| { |
| return crc7_syndrome_table[(crc << 1) ^ data]; |
| } |
| |
| static u8 crc7(u8 crc, const u8 *buffer, u32 len) |
| { |
| while (len--) |
| crc = crc7_byte(crc, *buffer++); |
| return crc; |
| } |
| |
| /******************************************** |
| * |
| * Spi protocol Function |
| * |
| ********************************************/ |
| |
| #define CMD_DMA_WRITE 0xc1 |
| #define CMD_DMA_READ 0xc2 |
| #define CMD_INTERNAL_WRITE 0xc3 |
| #define CMD_INTERNAL_READ 0xc4 |
| #define CMD_TERMINATE 0xc5 |
| #define CMD_REPEAT 0xc6 |
| #define CMD_DMA_EXT_WRITE 0xc7 |
| #define CMD_DMA_EXT_READ 0xc8 |
| #define CMD_SINGLE_WRITE 0xc9 |
| #define CMD_SINGLE_READ 0xca |
| #define CMD_RESET 0xcf |
| |
| #define N_OK 1 |
| #define N_FAIL 0 |
| #define N_RESET -1 |
| #define N_RETRY -2 |
| |
| #define DATA_PKT_SZ_256 256 |
| #define DATA_PKT_SZ_512 512 |
| #define DATA_PKT_SZ_1K 1024 |
| #define DATA_PKT_SZ_4K (4 * 1024) |
| #define DATA_PKT_SZ_8K (8 * 1024) |
| #define DATA_PKT_SZ DATA_PKT_SZ_8K |
| |
| #define USE_SPI_DMA 0 |
| |
| static int wilc_bus_probe(struct spi_device *spi) |
| { |
| int ret, gpio; |
| struct wilc *wilc; |
| |
| gpio = of_get_gpio(spi->dev.of_node, 0); |
| if (gpio < 0) |
| gpio = GPIO_NUM; |
| |
| ret = wilc_netdev_init(&wilc, NULL, HIF_SPI, GPIO_NUM, &wilc_hif_spi); |
| if (ret) |
| return ret; |
| |
| spi_set_drvdata(spi, wilc); |
| wilc->dev = &spi->dev; |
| |
| return 0; |
| } |
| |
| static int wilc_bus_remove(struct spi_device *spi) |
| { |
| wilc_netdev_cleanup(spi_get_drvdata(spi)); |
| return 0; |
| } |
| |
| static const struct of_device_id wilc1000_of_match[] = { |
| { .compatible = "atmel,wilc_spi", }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, wilc1000_of_match); |
| |
| static struct spi_driver wilc1000_spi_driver = { |
| .driver = { |
| .name = MODALIAS, |
| .of_match_table = wilc1000_of_match, |
| }, |
| .probe = wilc_bus_probe, |
| .remove = wilc_bus_remove, |
| }; |
| module_spi_driver(wilc1000_spi_driver); |
| MODULE_LICENSE("GPL"); |
| |
| static int wilc_spi_tx(struct wilc *wilc, u8 *b, u32 len) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| struct spi_message msg; |
| |
| if (len > 0 && b) { |
| struct spi_transfer tr = { |
| .tx_buf = b, |
| .len = len, |
| .delay_usecs = 0, |
| }; |
| char *r_buffer = kzalloc(len, GFP_KERNEL); |
| |
| if (!r_buffer) |
| return -ENOMEM; |
| |
| tr.rx_buf = r_buffer; |
| dev_dbg(&spi->dev, "Request writing %d bytes\n", len); |
| |
| memset(&msg, 0, sizeof(msg)); |
| spi_message_init(&msg); |
| msg.spi = spi; |
| msg.is_dma_mapped = USE_SPI_DMA; |
| spi_message_add_tail(&tr, &msg); |
| |
| ret = spi_sync(spi, &msg); |
| if (ret < 0) |
| dev_err(&spi->dev, "SPI transaction failed\n"); |
| |
| kfree(r_buffer); |
| } else { |
| dev_err(&spi->dev, |
| "can't write data with the following length: %d\n", |
| len); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int wilc_spi_rx(struct wilc *wilc, u8 *rb, u32 rlen) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| |
| if (rlen > 0) { |
| struct spi_message msg; |
| struct spi_transfer tr = { |
| .rx_buf = rb, |
| .len = rlen, |
| .delay_usecs = 0, |
| |
| }; |
| char *t_buffer = kzalloc(rlen, GFP_KERNEL); |
| |
| if (!t_buffer) |
| return -ENOMEM; |
| |
| tr.tx_buf = t_buffer; |
| |
| memset(&msg, 0, sizeof(msg)); |
| spi_message_init(&msg); |
| msg.spi = spi; |
| msg.is_dma_mapped = USE_SPI_DMA; |
| spi_message_add_tail(&tr, &msg); |
| |
| ret = spi_sync(spi, &msg); |
| if (ret < 0) |
| dev_err(&spi->dev, "SPI transaction failed\n"); |
| kfree(t_buffer); |
| } else { |
| dev_err(&spi->dev, |
| "can't read data with the following length: %u\n", |
| rlen); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int wilc_spi_tx_rx(struct wilc *wilc, u8 *wb, u8 *rb, u32 rlen) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| |
| if (rlen > 0) { |
| struct spi_message msg; |
| struct spi_transfer tr = { |
| .rx_buf = rb, |
| .tx_buf = wb, |
| .len = rlen, |
| .bits_per_word = 8, |
| .delay_usecs = 0, |
| |
| }; |
| |
| memset(&msg, 0, sizeof(msg)); |
| spi_message_init(&msg); |
| msg.spi = spi; |
| msg.is_dma_mapped = USE_SPI_DMA; |
| |
| spi_message_add_tail(&tr, &msg); |
| ret = spi_sync(spi, &msg); |
| if (ret < 0) |
| dev_err(&spi->dev, "SPI transaction failed\n"); |
| } else { |
| dev_err(&spi->dev, |
| "can't read data with the following length: %u\n", |
| rlen); |
| ret = -EINVAL; |
| } |
| |
| return ret; |
| } |
| |
| static int spi_cmd_complete(struct wilc *wilc, u8 cmd, u32 adr, u8 *b, u32 sz, |
| u8 clockless) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| u8 wb[32], rb[32]; |
| u8 wix, rix; |
| u32 len2; |
| u8 rsp; |
| int len = 0; |
| int result = N_OK; |
| |
| wb[0] = cmd; |
| switch (cmd) { |
| case CMD_SINGLE_READ: /* single word (4 bytes) read */ |
| wb[1] = (u8)(adr >> 16); |
| wb[2] = (u8)(adr >> 8); |
| wb[3] = (u8)adr; |
| len = 5; |
| break; |
| |
| case CMD_INTERNAL_READ: /* internal register read */ |
| wb[1] = (u8)(adr >> 8); |
| if (clockless == 1) |
| wb[1] |= BIT(7); |
| wb[2] = (u8)adr; |
| wb[3] = 0x00; |
| len = 5; |
| break; |
| |
| case CMD_TERMINATE: /* termination */ |
| wb[1] = 0x00; |
| wb[2] = 0x00; |
| wb[3] = 0x00; |
| len = 5; |
| break; |
| |
| case CMD_REPEAT: /* repeat */ |
| wb[1] = 0x00; |
| wb[2] = 0x00; |
| wb[3] = 0x00; |
| len = 5; |
| break; |
| |
| case CMD_RESET: /* reset */ |
| wb[1] = 0xff; |
| wb[2] = 0xff; |
| wb[3] = 0xff; |
| len = 5; |
| break; |
| |
| case CMD_DMA_WRITE: /* dma write */ |
| case CMD_DMA_READ: /* dma read */ |
| wb[1] = (u8)(adr >> 16); |
| wb[2] = (u8)(adr >> 8); |
| wb[3] = (u8)adr; |
| wb[4] = (u8)(sz >> 8); |
| wb[5] = (u8)(sz); |
| len = 7; |
| break; |
| |
| case CMD_DMA_EXT_WRITE: /* dma extended write */ |
| case CMD_DMA_EXT_READ: /* dma extended read */ |
| wb[1] = (u8)(adr >> 16); |
| wb[2] = (u8)(adr >> 8); |
| wb[3] = (u8)adr; |
| wb[4] = (u8)(sz >> 16); |
| wb[5] = (u8)(sz >> 8); |
| wb[6] = (u8)(sz); |
| len = 8; |
| break; |
| |
| case CMD_INTERNAL_WRITE: /* internal register write */ |
| wb[1] = (u8)(adr >> 8); |
| if (clockless == 1) |
| wb[1] |= BIT(7); |
| wb[2] = (u8)(adr); |
| wb[3] = b[3]; |
| wb[4] = b[2]; |
| wb[5] = b[1]; |
| wb[6] = b[0]; |
| len = 8; |
| break; |
| |
| case CMD_SINGLE_WRITE: /* single word write */ |
| wb[1] = (u8)(adr >> 16); |
| wb[2] = (u8)(adr >> 8); |
| wb[3] = (u8)(adr); |
| wb[4] = b[3]; |
| wb[5] = b[2]; |
| wb[6] = b[1]; |
| wb[7] = b[0]; |
| len = 9; |
| break; |
| |
| default: |
| result = N_FAIL; |
| break; |
| } |
| |
| if (result != N_OK) |
| return result; |
| |
| if (!g_spi.crc_off) |
| wb[len - 1] = (crc7(0x7f, (const u8 *)&wb[0], len - 1)) << 1; |
| else |
| len -= 1; |
| |
| #define NUM_SKIP_BYTES (1) |
| #define NUM_RSP_BYTES (2) |
| #define NUM_DATA_HDR_BYTES (1) |
| #define NUM_DATA_BYTES (4) |
| #define NUM_CRC_BYTES (2) |
| #define NUM_DUMMY_BYTES (3) |
| if ((cmd == CMD_RESET) || |
| (cmd == CMD_TERMINATE) || |
| (cmd == CMD_REPEAT)) { |
| len2 = len + (NUM_SKIP_BYTES + NUM_RSP_BYTES + NUM_DUMMY_BYTES); |
| } else if ((cmd == CMD_INTERNAL_READ) || (cmd == CMD_SINGLE_READ)) { |
| if (!g_spi.crc_off) { |
| len2 = len + (NUM_RSP_BYTES + NUM_DATA_HDR_BYTES + NUM_DATA_BYTES |
| + NUM_CRC_BYTES + NUM_DUMMY_BYTES); |
| } else { |
| len2 = len + (NUM_RSP_BYTES + NUM_DATA_HDR_BYTES + NUM_DATA_BYTES |
| + NUM_DUMMY_BYTES); |
| } |
| } else { |
| len2 = len + (NUM_RSP_BYTES + NUM_DUMMY_BYTES); |
| } |
| #undef NUM_DUMMY_BYTES |
| |
| if (len2 > ARRAY_SIZE(wb)) { |
| dev_err(&spi->dev, "spi buffer size too small (%d) (%zu)\n", |
| len2, ARRAY_SIZE(wb)); |
| result = N_FAIL; |
| return result; |
| } |
| /* zero spi write buffers. */ |
| for (wix = len; wix < len2; wix++) |
| wb[wix] = 0; |
| rix = len; |
| |
| if (wilc_spi_tx_rx(wilc, wb, rb, len2)) { |
| dev_err(&spi->dev, "Failed cmd write, bus error...\n"); |
| result = N_FAIL; |
| return result; |
| } |
| |
| /** |
| * Command/Control response |
| **/ |
| if ((cmd == CMD_RESET) || |
| (cmd == CMD_TERMINATE) || |
| (cmd == CMD_REPEAT)) { |
| rix++; /* skip 1 byte */ |
| } |
| |
| /* do { */ |
| rsp = rb[rix++]; |
| /* if(rsp == cmd) break; */ |
| /* } while(&rptr[1] <= &rb[len2]); */ |
| |
| if (rsp != cmd) { |
| dev_err(&spi->dev, |
| "Failed cmd response, cmd (%02x), resp (%02x)\n", |
| cmd, rsp); |
| result = N_FAIL; |
| return result; |
| } |
| |
| /** |
| * State response |
| **/ |
| rsp = rb[rix++]; |
| if (rsp != 0x00) { |
| dev_err(&spi->dev, "Failed cmd state response state (%02x)\n", |
| rsp); |
| result = N_FAIL; |
| return result; |
| } |
| |
| if ((cmd == CMD_INTERNAL_READ) || (cmd == CMD_SINGLE_READ) |
| || (cmd == CMD_DMA_READ) || (cmd == CMD_DMA_EXT_READ)) { |
| int retry; |
| /* u16 crc1, crc2; */ |
| u8 crc[2]; |
| /** |
| * Data Respnose header |
| **/ |
| retry = 100; |
| do { |
| /* ensure there is room in buffer later to read data and crc */ |
| if (rix < len2) { |
| rsp = rb[rix++]; |
| } else { |
| retry = 0; |
| break; |
| } |
| if (((rsp >> 4) & 0xf) == 0xf) |
| break; |
| } while (retry--); |
| |
| if (retry <= 0) { |
| dev_err(&spi->dev, |
| "Error, data read response (%02x)\n", rsp); |
| result = N_RESET; |
| return result; |
| } |
| |
| if ((cmd == CMD_INTERNAL_READ) || (cmd == CMD_SINGLE_READ)) { |
| /** |
| * Read bytes |
| **/ |
| if ((rix + 3) < len2) { |
| b[0] = rb[rix++]; |
| b[1] = rb[rix++]; |
| b[2] = rb[rix++]; |
| b[3] = rb[rix++]; |
| } else { |
| dev_err(&spi->dev, |
| "buffer overrun when reading data.\n"); |
| result = N_FAIL; |
| return result; |
| } |
| |
| if (!g_spi.crc_off) { |
| /** |
| * Read Crc |
| **/ |
| if ((rix + 1) < len2) { |
| crc[0] = rb[rix++]; |
| crc[1] = rb[rix++]; |
| } else { |
| dev_err(&spi->dev, "buffer overrun when reading crc.\n"); |
| result = N_FAIL; |
| return result; |
| } |
| } |
| } else if ((cmd == CMD_DMA_READ) || (cmd == CMD_DMA_EXT_READ)) { |
| int ix; |
| |
| /* some data may be read in response to dummy bytes. */ |
| for (ix = 0; (rix < len2) && (ix < sz); ) |
| b[ix++] = rb[rix++]; |
| |
| sz -= ix; |
| |
| if (sz > 0) { |
| int nbytes; |
| |
| if (sz <= (DATA_PKT_SZ - ix)) |
| nbytes = sz; |
| else |
| nbytes = DATA_PKT_SZ - ix; |
| |
| /** |
| * Read bytes |
| **/ |
| if (wilc_spi_rx(wilc, &b[ix], nbytes)) { |
| dev_err(&spi->dev, "Failed data block read, bus error...\n"); |
| result = N_FAIL; |
| goto _error_; |
| } |
| |
| /** |
| * Read Crc |
| **/ |
| if (!g_spi.crc_off) { |
| if (wilc_spi_rx(wilc, crc, 2)) { |
| dev_err(&spi->dev, "Failed data block crc read, bus error...\n"); |
| result = N_FAIL; |
| goto _error_; |
| } |
| } |
| |
| |
| ix += nbytes; |
| sz -= nbytes; |
| } |
| |
| /* if any data in left unread, then read the rest using normal DMA code.*/ |
| while (sz > 0) { |
| int nbytes; |
| |
| if (sz <= DATA_PKT_SZ) |
| nbytes = sz; |
| else |
| nbytes = DATA_PKT_SZ; |
| |
| /** |
| * read data response only on the next DMA cycles not |
| * the first DMA since data response header is already |
| * handled above for the first DMA. |
| **/ |
| /** |
| * Data Respnose header |
| **/ |
| retry = 10; |
| do { |
| if (wilc_spi_rx(wilc, &rsp, 1)) { |
| dev_err(&spi->dev, "Failed data response read, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| if (((rsp >> 4) & 0xf) == 0xf) |
| break; |
| } while (retry--); |
| |
| if (result == N_FAIL) |
| break; |
| |
| |
| /** |
| * Read bytes |
| **/ |
| if (wilc_spi_rx(wilc, &b[ix], nbytes)) { |
| dev_err(&spi->dev, "Failed data block read, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| |
| /** |
| * Read Crc |
| **/ |
| if (!g_spi.crc_off) { |
| if (wilc_spi_rx(wilc, crc, 2)) { |
| dev_err(&spi->dev, "Failed data block crc read, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| } |
| |
| ix += nbytes; |
| sz -= nbytes; |
| } |
| } |
| } |
| _error_: |
| return result; |
| } |
| |
| static int spi_data_write(struct wilc *wilc, u8 *b, u32 sz) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ix, nbytes; |
| int result = 1; |
| u8 cmd, order, crc[2] = {0}; |
| /* u8 rsp; */ |
| |
| /** |
| * Data |
| **/ |
| ix = 0; |
| do { |
| if (sz <= DATA_PKT_SZ) |
| nbytes = sz; |
| else |
| nbytes = DATA_PKT_SZ; |
| |
| /** |
| * Write command |
| **/ |
| cmd = 0xf0; |
| if (ix == 0) { |
| if (sz <= DATA_PKT_SZ) |
| |
| order = 0x3; |
| else |
| order = 0x1; |
| } else { |
| if (sz <= DATA_PKT_SZ) |
| order = 0x3; |
| else |
| order = 0x2; |
| } |
| cmd |= order; |
| if (wilc_spi_tx(wilc, &cmd, 1)) { |
| dev_err(&spi->dev, |
| "Failed data block cmd write, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| |
| /** |
| * Write data |
| **/ |
| if (wilc_spi_tx(wilc, &b[ix], nbytes)) { |
| dev_err(&spi->dev, |
| "Failed data block write, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| |
| /** |
| * Write Crc |
| **/ |
| if (!g_spi.crc_off) { |
| if (wilc_spi_tx(wilc, crc, 2)) { |
| dev_err(&spi->dev, "Failed data block crc write, bus error...\n"); |
| result = N_FAIL; |
| break; |
| } |
| } |
| |
| /** |
| * No need to wait for response |
| **/ |
| ix += nbytes; |
| sz -= nbytes; |
| } while (sz); |
| |
| |
| return result; |
| } |
| |
| /******************************************** |
| * |
| * Spi Internal Read/Write Function |
| * |
| ********************************************/ |
| |
| static int spi_internal_write(struct wilc *wilc, u32 adr, u32 dat) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int result; |
| |
| dat = cpu_to_le32(dat); |
| result = spi_cmd_complete(wilc, CMD_INTERNAL_WRITE, adr, (u8 *)&dat, 4, |
| 0); |
| if (result != N_OK) |
| dev_err(&spi->dev, "Failed internal write cmd...\n"); |
| |
| return result; |
| } |
| |
| static int spi_internal_read(struct wilc *wilc, u32 adr, u32 *data) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int result; |
| |
| result = spi_cmd_complete(wilc, CMD_INTERNAL_READ, adr, (u8 *)data, 4, |
| 0); |
| if (result != N_OK) { |
| dev_err(&spi->dev, "Failed internal read cmd...\n"); |
| return 0; |
| } |
| |
| *data = cpu_to_le32(*data); |
| |
| return 1; |
| } |
| |
| /******************************************** |
| * |
| * Spi interfaces |
| * |
| ********************************************/ |
| |
| static int wilc_spi_write_reg(struct wilc *wilc, u32 addr, u32 data) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int result = N_OK; |
| u8 cmd = CMD_SINGLE_WRITE; |
| u8 clockless = 0; |
| |
| data = cpu_to_le32(data); |
| if (addr < 0x30) { |
| /* Clockless register*/ |
| cmd = CMD_INTERNAL_WRITE; |
| clockless = 1; |
| } |
| |
| result = spi_cmd_complete(wilc, cmd, addr, (u8 *)&data, 4, clockless); |
| if (result != N_OK) |
| dev_err(&spi->dev, "Failed cmd, write reg (%08x)...\n", addr); |
| |
| return result; |
| } |
| |
| static int wilc_spi_write(struct wilc *wilc, u32 addr, u8 *buf, u32 size) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int result; |
| u8 cmd = CMD_DMA_EXT_WRITE; |
| |
| /** |
| * has to be greated than 4 |
| **/ |
| if (size <= 4) |
| return 0; |
| |
| result = spi_cmd_complete(wilc, cmd, addr, NULL, size, 0); |
| if (result != N_OK) { |
| dev_err(&spi->dev, |
| "Failed cmd, write block (%08x)...\n", addr); |
| return 0; |
| } |
| |
| /** |
| * Data |
| **/ |
| result = spi_data_write(wilc, buf, size); |
| if (result != N_OK) |
| dev_err(&spi->dev, "Failed block data write...\n"); |
| |
| return 1; |
| } |
| |
| static int wilc_spi_read_reg(struct wilc *wilc, u32 addr, u32 *data) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int result = N_OK; |
| u8 cmd = CMD_SINGLE_READ; |
| u8 clockless = 0; |
| |
| if (addr < 0x30) { |
| /* dev_err(&spi->dev, "***** read addr %d\n\n", addr); */ |
| /* Clockless register*/ |
| cmd = CMD_INTERNAL_READ; |
| clockless = 1; |
| } |
| |
| result = spi_cmd_complete(wilc, cmd, addr, (u8 *)data, 4, clockless); |
| if (result != N_OK) { |
| dev_err(&spi->dev, "Failed cmd, read reg (%08x)...\n", addr); |
| return 0; |
| } |
| |
| *data = cpu_to_le32(*data); |
| |
| return 1; |
| } |
| |
| static int wilc_spi_read(struct wilc *wilc, u32 addr, u8 *buf, u32 size) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| u8 cmd = CMD_DMA_EXT_READ; |
| int result; |
| |
| if (size <= 4) |
| return 0; |
| |
| result = spi_cmd_complete(wilc, cmd, addr, buf, size, 0); |
| if (result != N_OK) { |
| dev_err(&spi->dev, "Failed cmd, read block (%08x)...\n", addr); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /******************************************** |
| * |
| * Bus interfaces |
| * |
| ********************************************/ |
| |
| static int _wilc_spi_deinit(struct wilc *wilc) |
| { |
| /** |
| * TODO: |
| **/ |
| return 1; |
| } |
| |
| static int wilc_spi_init(struct wilc *wilc, bool resume) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| u32 reg; |
| u32 chipid; |
| |
| static int isinit; |
| |
| if (isinit) { |
| |
| if (!wilc_spi_read_reg(wilc, 0x1000, &chipid)) { |
| dev_err(&spi->dev, "Fail cmd read chip id...\n"); |
| return 0; |
| } |
| return 1; |
| } |
| |
| memset(&g_spi, 0, sizeof(struct wilc_spi)); |
| |
| /** |
| * configure protocol |
| **/ |
| g_spi.crc_off = 0; |
| |
| /* TODO: We can remove the CRC trials if there is a definite way to reset */ |
| /* the SPI to it's initial value. */ |
| if (!spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, ®)) { |
| /* Read failed. Try with CRC off. This might happen when module |
| * is removed but chip isn't reset*/ |
| g_spi.crc_off = 1; |
| dev_err(&spi->dev, "Failed internal read protocol with CRC on, retyring with CRC off...\n"); |
| if (!spi_internal_read(wilc, WILC_SPI_PROTOCOL_OFFSET, ®)) { |
| /* Reaad failed with both CRC on and off, something went bad */ |
| dev_err(&spi->dev, |
| "Failed internal read protocol...\n"); |
| return 0; |
| } |
| } |
| if (g_spi.crc_off == 0) { |
| reg &= ~0xc; /* disable crc checking */ |
| reg &= ~0x70; |
| reg |= (0x5 << 4); |
| if (!spi_internal_write(wilc, WILC_SPI_PROTOCOL_OFFSET, reg)) { |
| dev_err(&spi->dev, "[wilc spi %d]: Failed internal write protocol reg...\n", __LINE__); |
| return 0; |
| } |
| g_spi.crc_off = 1; |
| } |
| |
| |
| /** |
| * make sure can read back chip id correctly |
| **/ |
| if (!wilc_spi_read_reg(wilc, 0x1000, &chipid)) { |
| dev_err(&spi->dev, "Fail cmd read chip id...\n"); |
| return 0; |
| } |
| /* dev_err(&spi->dev, "chipid (%08x)\n", chipid); */ |
| |
| g_spi.has_thrpt_enh = 1; |
| |
| isinit = 1; |
| |
| return 1; |
| } |
| |
| static int wilc_spi_read_size(struct wilc *wilc, u32 *size) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| |
| if (g_spi.has_thrpt_enh) { |
| ret = spi_internal_read(wilc, 0xe840 - WILC_SPI_REG_BASE, |
| size); |
| *size = *size & IRQ_DMA_WD_CNT_MASK; |
| } else { |
| u32 tmp; |
| u32 byte_cnt; |
| |
| ret = wilc_spi_read_reg(wilc, WILC_VMM_TO_HOST_SIZE, |
| &byte_cnt); |
| if (!ret) { |
| dev_err(&spi->dev, |
| "Failed read WILC_VMM_TO_HOST_SIZE ...\n"); |
| goto _fail_; |
| } |
| tmp = (byte_cnt >> 2) & IRQ_DMA_WD_CNT_MASK; |
| *size = tmp; |
| } |
| |
| |
| |
| _fail_: |
| return ret; |
| } |
| |
| |
| |
| static int wilc_spi_read_int(struct wilc *wilc, u32 *int_status) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| |
| if (g_spi.has_thrpt_enh) { |
| ret = spi_internal_read(wilc, 0xe840 - WILC_SPI_REG_BASE, |
| int_status); |
| } else { |
| u32 tmp; |
| u32 byte_cnt; |
| |
| ret = wilc_spi_read_reg(wilc, WILC_VMM_TO_HOST_SIZE, |
| &byte_cnt); |
| if (!ret) { |
| dev_err(&spi->dev, |
| "Failed read WILC_VMM_TO_HOST_SIZE ...\n"); |
| goto _fail_; |
| } |
| tmp = (byte_cnt >> 2) & IRQ_DMA_WD_CNT_MASK; |
| |
| { |
| int happended, j; |
| |
| j = 0; |
| do { |
| u32 irq_flags; |
| |
| happended = 0; |
| |
| wilc_spi_read_reg(wilc, 0x1a90, &irq_flags); |
| tmp |= ((irq_flags >> 27) << IRG_FLAGS_OFFSET); |
| |
| if (g_spi.nint > 5) { |
| wilc_spi_read_reg(wilc, 0x1a94, |
| &irq_flags); |
| tmp |= (((irq_flags >> 0) & 0x7) << (IRG_FLAGS_OFFSET + 5)); |
| } |
| |
| { |
| u32 unkmown_mask; |
| |
| unkmown_mask = ~((1ul << g_spi.nint) - 1); |
| |
| if ((tmp >> IRG_FLAGS_OFFSET) & unkmown_mask) { |
| dev_err(&spi->dev, "Unexpected interrupt (2): j=%d, tmp=%x, mask=%x\n", j, tmp, unkmown_mask); |
| happended = 1; |
| } |
| } |
| j++; |
| } while (happended); |
| } |
| |
| *int_status = tmp; |
| |
| } |
| |
| _fail_: |
| return ret; |
| } |
| |
| static int wilc_spi_clear_int_ext(struct wilc *wilc, u32 val) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| int ret; |
| |
| if (g_spi.has_thrpt_enh) { |
| ret = spi_internal_write(wilc, 0xe844 - WILC_SPI_REG_BASE, |
| val); |
| } else { |
| u32 flags; |
| |
| flags = val & (BIT(MAX_NUM_INT) - 1); |
| if (flags) { |
| int i; |
| |
| ret = 1; |
| for (i = 0; i < g_spi.nint; i++) { |
| /* No matter what you write 1 or 0, it will clear interrupt. */ |
| if (flags & 1) |
| ret = wilc_spi_write_reg(wilc, 0x10c8 + i * 4, 1); |
| if (!ret) |
| break; |
| flags >>= 1; |
| } |
| if (!ret) { |
| dev_err(&spi->dev, |
| "Failed wilc_spi_write_reg, set reg %x ...\n", |
| 0x10c8 + i * 4); |
| goto _fail_; |
| } |
| for (i = g_spi.nint; i < MAX_NUM_INT; i++) { |
| if (flags & 1) |
| dev_err(&spi->dev, |
| "Unexpected interrupt cleared %d...\n", |
| i); |
| flags >>= 1; |
| } |
| } |
| |
| { |
| u32 tbl_ctl; |
| |
| tbl_ctl = 0; |
| /* select VMM table 0 */ |
| if ((val & SEL_VMM_TBL0) == SEL_VMM_TBL0) |
| tbl_ctl |= BIT(0); |
| /* select VMM table 1 */ |
| if ((val & SEL_VMM_TBL1) == SEL_VMM_TBL1) |
| tbl_ctl |= BIT(1); |
| |
| ret = wilc_spi_write_reg(wilc, WILC_VMM_TBL_CTL, |
| tbl_ctl); |
| if (!ret) { |
| dev_err(&spi->dev, |
| "fail write reg vmm_tbl_ctl...\n"); |
| goto _fail_; |
| } |
| |
| if ((val & EN_VMM) == EN_VMM) { |
| /** |
| * enable vmm transfer. |
| **/ |
| ret = wilc_spi_write_reg(wilc, |
| WILC_VMM_CORE_CTL, 1); |
| if (!ret) { |
| dev_err(&spi->dev, "fail write reg vmm_core_ctl...\n"); |
| goto _fail_; |
| } |
| } |
| } |
| } |
| _fail_: |
| return ret; |
| } |
| |
| static int wilc_spi_sync_ext(struct wilc *wilc, int nint) |
| { |
| struct spi_device *spi = to_spi_device(wilc->dev); |
| u32 reg; |
| int ret, i; |
| |
| if (nint > MAX_NUM_INT) { |
| dev_err(&spi->dev, "Too many interupts (%d)...\n", nint); |
| return 0; |
| } |
| |
| g_spi.nint = nint; |
| |
| /** |
| * interrupt pin mux select |
| **/ |
| ret = wilc_spi_read_reg(wilc, WILC_PIN_MUX_0, ®); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed read reg (%08x)...\n", |
| WILC_PIN_MUX_0); |
| return 0; |
| } |
| reg |= BIT(8); |
| ret = wilc_spi_write_reg(wilc, WILC_PIN_MUX_0, reg); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed write reg (%08x)...\n", |
| WILC_PIN_MUX_0); |
| return 0; |
| } |
| |
| /** |
| * interrupt enable |
| **/ |
| ret = wilc_spi_read_reg(wilc, WILC_INTR_ENABLE, ®); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed read reg (%08x)...\n", |
| WILC_INTR_ENABLE); |
| return 0; |
| } |
| |
| for (i = 0; (i < 5) && (nint > 0); i++, nint--) |
| reg |= (BIT((27 + i))); |
| |
| ret = wilc_spi_write_reg(wilc, WILC_INTR_ENABLE, reg); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed write reg (%08x)...\n", |
| WILC_INTR_ENABLE); |
| return 0; |
| } |
| if (nint) { |
| ret = wilc_spi_read_reg(wilc, WILC_INTR2_ENABLE, ®); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed read reg (%08x)...\n", |
| WILC_INTR2_ENABLE); |
| return 0; |
| } |
| |
| for (i = 0; (i < 3) && (nint > 0); i++, nint--) |
| reg |= BIT(i); |
| |
| ret = wilc_spi_read_reg(wilc, WILC_INTR2_ENABLE, ®); |
| if (!ret) { |
| dev_err(&spi->dev, "Failed write reg (%08x)...\n", |
| WILC_INTR2_ENABLE); |
| return 0; |
| } |
| } |
| |
| return 1; |
| } |
| /******************************************** |
| * |
| * Global spi HIF function table |
| * |
| ********************************************/ |
| const struct wilc_hif_func wilc_hif_spi = { |
| .hif_init = wilc_spi_init, |
| .hif_deinit = _wilc_spi_deinit, |
| .hif_read_reg = wilc_spi_read_reg, |
| .hif_write_reg = wilc_spi_write_reg, |
| .hif_block_rx = wilc_spi_read, |
| .hif_block_tx = wilc_spi_write, |
| .hif_read_int = wilc_spi_read_int, |
| .hif_clear_int_ext = wilc_spi_clear_int_ext, |
| .hif_read_size = wilc_spi_read_size, |
| .hif_block_tx_ext = wilc_spi_write, |
| .hif_block_rx_ext = wilc_spi_read, |
| .hif_sync_ext = wilc_spi_sync_ext, |
| }; |