diff options
Diffstat (limited to 'drivers/spi/spi-bfin-v3.c')
| -rw-r--r-- | drivers/spi/spi-bfin-v3.c | 965 |
1 files changed, 0 insertions, 965 deletions
diff --git a/drivers/spi/spi-bfin-v3.c b/drivers/spi/spi-bfin-v3.c deleted file mode 100644 index f4bf81347d6..00000000000 --- a/drivers/spi/spi-bfin-v3.c +++ /dev/null @@ -1,965 +0,0 @@ -/* - * Analog Devices SPI3 controller driver - * - * Copyright (c) 2013 Analog Devices Inc. - * - * 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. - */ - -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/dma-mapping.h> -#include <linux/errno.h> -#include <linux/gpio.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/io.h> -#include <linux/ioport.h> -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/spi/spi.h> -#include <linux/types.h> - -#include <asm/bfin_spi3.h> -#include <asm/cacheflush.h> -#include <asm/dma.h> -#include <asm/portmux.h> - -enum bfin_spi_state { - START_STATE, - RUNNING_STATE, - DONE_STATE, - ERROR_STATE -}; - -struct bfin_spi_master; - -struct bfin_spi_transfer_ops { - void (*write) (struct bfin_spi_master *); - void (*read) (struct bfin_spi_master *); - void (*duplex) (struct bfin_spi_master *); -}; - -/* runtime info for spi master */ -struct bfin_spi_master { - /* SPI framework hookup */ - struct spi_master *master; - - /* Regs base of SPI controller */ - struct bfin_spi_regs __iomem *regs; - - /* Pin request list */ - u16 *pin_req; - - /* Message Transfer pump */ - struct tasklet_struct pump_transfers; - - /* Current message transfer state info */ - struct spi_message *cur_msg; - struct spi_transfer *cur_transfer; - struct bfin_spi_device *cur_chip; - unsigned transfer_len; - - /* transfer buffer */ - void *tx; - void *tx_end; - void *rx; - void *rx_end; - - /* dma info */ - unsigned int tx_dma; - unsigned int rx_dma; - dma_addr_t tx_dma_addr; - dma_addr_t rx_dma_addr; - unsigned long dummy_buffer; /* used in unidirectional transfer */ - unsigned long tx_dma_size; - unsigned long rx_dma_size; - int tx_num; - int rx_num; - - /* store register value for suspend/resume */ - u32 control; - u32 ssel; - - unsigned long sclk; - enum bfin_spi_state state; - - const struct bfin_spi_transfer_ops *ops; -}; - -struct bfin_spi_device { - u32 control; - u32 clock; - u32 ssel; - - u8 cs; - u16 cs_chg_udelay; /* Some devices require > 255usec delay */ - u32 cs_gpio; - u32 tx_dummy_val; /* tx value for rx only transfer */ - bool enable_dma; - const struct bfin_spi_transfer_ops *ops; -}; - -static void bfin_spi_enable(struct bfin_spi_master *drv_data) -{ - bfin_write_or(&drv_data->regs->control, SPI_CTL_EN); -} - -static void bfin_spi_disable(struct bfin_spi_master *drv_data) -{ - bfin_write_and(&drv_data->regs->control, ~SPI_CTL_EN); -} - -/* Caculate the SPI_CLOCK register value based on input HZ */ -static u32 hz_to_spi_clock(u32 sclk, u32 speed_hz) -{ - u32 spi_clock = sclk / speed_hz; - - if (spi_clock) - spi_clock--; - return spi_clock; -} - -static int bfin_spi_flush(struct bfin_spi_master *drv_data) -{ - unsigned long limit = loops_per_jiffy << 1; - - /* wait for stop and clear stat */ - while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_SPIF) && --limit) - cpu_relax(); - - bfin_write(&drv_data->regs->status, 0xFFFFFFFF); - - return limit; -} - -/* Chip select operation functions for cs_change flag */ -static void bfin_spi_cs_active(struct bfin_spi_master *drv_data, struct bfin_spi_device *chip) -{ - if (likely(chip->cs < MAX_CTRL_CS)) - bfin_write_and(&drv_data->regs->ssel, ~chip->ssel); - else - gpio_set_value(chip->cs_gpio, 0); -} - -static void bfin_spi_cs_deactive(struct bfin_spi_master *drv_data, - struct bfin_spi_device *chip) -{ - if (likely(chip->cs < MAX_CTRL_CS)) - bfin_write_or(&drv_data->regs->ssel, chip->ssel); - else - gpio_set_value(chip->cs_gpio, 1); - - /* Move delay here for consistency */ - if (chip->cs_chg_udelay) - udelay(chip->cs_chg_udelay); -} - -/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */ -static inline void bfin_spi_cs_enable(struct bfin_spi_master *drv_data, - struct bfin_spi_device *chip) -{ - if (chip->cs < MAX_CTRL_CS) - bfin_write_or(&drv_data->regs->ssel, chip->ssel >> 8); -} - -static inline void bfin_spi_cs_disable(struct bfin_spi_master *drv_data, - struct bfin_spi_device *chip) -{ - if (chip->cs < MAX_CTRL_CS) - bfin_write_and(&drv_data->regs->ssel, ~(chip->ssel >> 8)); -} - -/* stop controller and re-config current chip*/ -static void bfin_spi_restore_state(struct bfin_spi_master *drv_data) -{ - struct bfin_spi_device *chip = drv_data->cur_chip; - - /* Clear status and disable clock */ - bfin_write(&drv_data->regs->status, 0xFFFFFFFF); - bfin_write(&drv_data->regs->rx_control, 0x0); - bfin_write(&drv_data->regs->tx_control, 0x0); - bfin_spi_disable(drv_data); - - SSYNC(); - - /* Load the registers */ - bfin_write(&drv_data->regs->control, chip->control); - bfin_write(&drv_data->regs->clock, chip->clock); - - bfin_spi_enable(drv_data); - drv_data->tx_num = drv_data->rx_num = 0; - /* we always choose tx transfer initiate */ - bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN); - bfin_write(&drv_data->regs->tx_control, - SPI_TXCTL_TEN | SPI_TXCTL_TTI); - bfin_spi_cs_active(drv_data, chip); -} - -/* discard invalid rx data and empty rfifo */ -static inline void dummy_read(struct bfin_spi_master *drv_data) -{ - while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)) - bfin_read(&drv_data->regs->rfifo); -} - -static void bfin_spi_u8_write(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->tx < drv_data->tx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++))); - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - bfin_read(&drv_data->regs->rfifo); - } -} - -static void bfin_spi_u8_read(struct bfin_spi_master *drv_data) -{ - u32 tx_val = drv_data->cur_chip->tx_dummy_val; - - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, tx_val); - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo); - } -} - -static void bfin_spi_u8_duplex(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++))); - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo); - } -} - -static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u8 = { - .write = bfin_spi_u8_write, - .read = bfin_spi_u8_read, - .duplex = bfin_spi_u8_duplex, -}; - -static void bfin_spi_u16_write(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->tx < drv_data->tx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx)); - drv_data->tx += 2; - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - bfin_read(&drv_data->regs->rfifo); - } -} - -static void bfin_spi_u16_read(struct bfin_spi_master *drv_data) -{ - u32 tx_val = drv_data->cur_chip->tx_dummy_val; - - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, tx_val); - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo); - drv_data->rx += 2; - } -} - -static void bfin_spi_u16_duplex(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx)); - drv_data->tx += 2; - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo); - drv_data->rx += 2; - } -} - -static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u16 = { - .write = bfin_spi_u16_write, - .read = bfin_spi_u16_read, - .duplex = bfin_spi_u16_duplex, -}; - -static void bfin_spi_u32_write(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->tx < drv_data->tx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx)); - drv_data->tx += 4; - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - bfin_read(&drv_data->regs->rfifo); - } -} - -static void bfin_spi_u32_read(struct bfin_spi_master *drv_data) -{ - u32 tx_val = drv_data->cur_chip->tx_dummy_val; - - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, tx_val); - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo); - drv_data->rx += 4; - } -} - -static void bfin_spi_u32_duplex(struct bfin_spi_master *drv_data) -{ - dummy_read(drv_data); - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx)); - drv_data->tx += 4; - while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE) - cpu_relax(); - *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo); - drv_data->rx += 4; - } -} - -static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u32 = { - .write = bfin_spi_u32_write, - .read = bfin_spi_u32_read, - .duplex = bfin_spi_u32_duplex, -}; - - -/* test if there is more transfer to be done */ -static void bfin_spi_next_transfer(struct bfin_spi_master *drv) -{ - struct spi_message *msg = drv->cur_msg; - struct spi_transfer *t = drv->cur_transfer; - - /* Move to next transfer */ - if (t->transfer_list.next != &msg->transfers) { - drv->cur_transfer = list_entry(t->transfer_list.next, - struct spi_transfer, transfer_list); - drv->state = RUNNING_STATE; - } else { - drv->state = DONE_STATE; - drv->cur_transfer = NULL; - } -} - -static void bfin_spi_giveback(struct bfin_spi_master *drv_data) -{ - struct bfin_spi_device *chip = drv_data->cur_chip; - - bfin_spi_cs_deactive(drv_data, chip); - spi_finalize_current_message(drv_data->master); -} - -static int bfin_spi_setup_transfer(struct bfin_spi_master *drv) -{ - struct spi_transfer *t = drv->cur_transfer; - u32 cr, cr_width; - - if (t->tx_buf) { - drv->tx = (void *)t->tx_buf; - drv->tx_end = drv->tx + t->len; - } else { - drv->tx = NULL; - } - - if (t->rx_buf) { - drv->rx = t->rx_buf; - drv->rx_end = drv->rx + t->len; - } else { - drv->rx = NULL; - } - - drv->transfer_len = t->len; - - /* bits per word setup */ - switch (t->bits_per_word) { - case 8: - cr_width = SPI_CTL_SIZE08; - drv->ops = &bfin_bfin_spi_transfer_ops_u8; - break; - case 16: - cr_width = SPI_CTL_SIZE16; - drv->ops = &bfin_bfin_spi_transfer_ops_u16; - break; - case 32: - cr_width = SPI_CTL_SIZE32; - drv->ops = &bfin_bfin_spi_transfer_ops_u32; - break; - default: - return -EINVAL; - } - cr = bfin_read(&drv->regs->control) & ~SPI_CTL_SIZE; - cr |= cr_width; - bfin_write(&drv->regs->control, cr); - - /* speed setup */ - bfin_write(&drv->regs->clock, - hz_to_spi_clock(drv->sclk, t->speed_hz)); - return 0; -} - -static int bfin_spi_dma_xfer(struct bfin_spi_master *drv_data) -{ - struct spi_transfer *t = drv_data->cur_transfer; - struct spi_message *msg = drv_data->cur_msg; - struct bfin_spi_device *chip = drv_data->cur_chip; - u32 dma_config; - unsigned long word_count, word_size; - void *tx_buf, *rx_buf; - - switch (t->bits_per_word) { - case 8: - dma_config = WDSIZE_8 | PSIZE_8; - word_count = drv_data->transfer_len; - word_size = 1; - break; - case 16: - dma_config = WDSIZE_16 | PSIZE_16; - word_count = drv_data->transfer_len / 2; - word_size = 2; - break; - default: - dma_config = WDSIZE_32 | PSIZE_32; - word_count = drv_data->transfer_len / 4; - word_size = 4; - break; - } - - if (!drv_data->rx) { - tx_buf = drv_data->tx; - rx_buf = &drv_data->dummy_buffer; - drv_data->tx_dma_size = drv_data->transfer_len; - drv_data->rx_dma_size = sizeof(drv_data->dummy_buffer); - set_dma_x_modify(drv_data->tx_dma, word_size); - set_dma_x_modify(drv_data->rx_dma, 0); - } else if (!drv_data->tx) { - drv_data->dummy_buffer = chip->tx_dummy_val; - tx_buf = &drv_data->dummy_buffer; - rx_buf = drv_data->rx; - drv_data->tx_dma_size = sizeof(drv_data->dummy_buffer); - drv_data->rx_dma_size = drv_data->transfer_len; - set_dma_x_modify(drv_data->tx_dma, 0); - set_dma_x_modify(drv_data->rx_dma, word_size); - } else { - tx_buf = drv_data->tx; - rx_buf = drv_data->rx; - drv_data->tx_dma_size = drv_data->rx_dma_size - = drv_data->transfer_len; - set_dma_x_modify(drv_data->tx_dma, word_size); - set_dma_x_modify(drv_data->rx_dma, word_size); - } - - drv_data->tx_dma_addr = dma_map_single(&msg->spi->dev, - (void *)tx_buf, - drv_data->tx_dma_size, - DMA_TO_DEVICE); - if (dma_mapping_error(&msg->spi->dev, - drv_data->tx_dma_addr)) - return -ENOMEM; - - drv_data->rx_dma_addr = dma_map_single(&msg->spi->dev, - (void *)rx_buf, - drv_data->rx_dma_size, - DMA_FROM_DEVICE); - if (dma_mapping_error(&msg->spi->dev, - drv_data->rx_dma_addr)) { - dma_unmap_single(&msg->spi->dev, - drv_data->tx_dma_addr, - drv_data->tx_dma_size, - DMA_TO_DEVICE); - return -ENOMEM; - } - - dummy_read(drv_data); - set_dma_x_count(drv_data->tx_dma, word_count); - set_dma_x_count(drv_data->rx_dma, word_count); - set_dma_start_addr(drv_data->tx_dma, drv_data->tx_dma_addr); - set_dma_start_addr(drv_data->rx_dma, drv_data->rx_dma_addr); - dma_config |= DMAFLOW_STOP | RESTART | DI_EN; - set_dma_config(drv_data->tx_dma, dma_config); - set_dma_config(drv_data->rx_dma, dma_config | WNR); - enable_dma(drv_data->tx_dma); - enable_dma(drv_data->rx_dma); - SSYNC(); - - bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN | SPI_RXCTL_RDR_NE); - SSYNC(); - bfin_write(&drv_data->regs->tx_control, - SPI_TXCTL_TEN | SPI_TXCTL_TTI | SPI_TXCTL_TDR_NF); - - return 0; -} - -static int bfin_spi_pio_xfer(struct bfin_spi_master *drv_data) -{ - struct spi_message *msg = drv_data->cur_msg; - - if (!drv_data->rx) { - /* write only half duplex */ - drv_data->ops->write(drv_data); - if (drv_data->tx != drv_data->tx_end) - return -EIO; - } else if (!drv_data->tx) { - /* read only half duplex */ - drv_data->ops->read(drv_data); - if (drv_data->rx != drv_data->rx_end) - return -EIO; - } else { - /* full duplex mode */ - drv_data->ops->duplex(drv_data); - if (drv_data->tx != drv_data->tx_end) - return -EIO; - } - - if (!bfin_spi_flush(drv_data)) - return -EIO; - msg->actual_length += drv_data->transfer_len; - tasklet_schedule(&drv_data->pump_transfers); - return 0; -} - -static void bfin_spi_pump_transfers(unsigned long data) -{ - struct bfin_spi_master *drv_data = (struct bfin_spi_master *)data; - struct spi_message *msg = NULL; - struct spi_transfer *t = NULL; - struct bfin_spi_device *chip = NULL; - int ret; - - /* Get current state information */ - msg = drv_data->cur_msg; - t = drv_data->cur_transfer; - chip = drv_data->cur_chip; - - /* Handle for abort */ - if (drv_data->state == ERROR_STATE) { - msg->status = -EIO; - bfin_spi_giveback(drv_data); - return; - } - - if (drv_data->state == RUNNING_STATE) { - if (t->delay_usecs) - udelay(t->delay_usecs); - if (t->cs_change) - bfin_spi_cs_deactive(drv_data, chip); - bfin_spi_next_transfer(drv_data); - t = drv_data->cur_transfer; - } - /* Handle end of message */ - if (drv_data->state == DONE_STATE) { - msg->status = 0; - bfin_spi_giveback(drv_data); - return; - } - - if ((t->len == 0) || (t->tx_buf == NULL && t->rx_buf == NULL)) { - /* Schedule next transfer tasklet */ - tasklet_schedule(&drv_data->pump_transfers); - return; - } - - ret = bfin_spi_setup_transfer(drv_data); - if (ret) { - msg->status = ret; - bfin_spi_giveback(drv_data); - } - - bfin_write(&drv_data->regs->status, 0xFFFFFFFF); - bfin_spi_cs_active(drv_data, chip); - drv_data->state = RUNNING_STATE; - - if (chip->enable_dma) - ret = bfin_spi_dma_xfer(drv_data); - else - ret = bfin_spi_pio_xfer(drv_data); - if (ret) { - msg->status = ret; - bfin_spi_giveback(drv_data); - } -} - -static int bfin_spi_transfer_one_message(struct spi_master *master, - struct spi_message *m) -{ - struct bfin_spi_master *drv_data = spi_master_get_devdata(master); - - drv_data->cur_msg = m; - drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); - bfin_spi_restore_state(drv_data); - - drv_data->state = START_STATE; - drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, - struct spi_transfer, transfer_list); - - tasklet_schedule(&drv_data->pump_transfers); - return 0; -} - -#define MAX_SPI_SSEL 7 - -static const u16 ssel[][MAX_SPI_SSEL] = { - {P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3, - P_SPI0_SSEL4, P_SPI0_SSEL5, - P_SPI0_SSEL6, P_SPI0_SSEL7}, - - {P_SPI1_SSEL1, P_SPI1_SSEL2, P_SPI1_SSEL3, - P_SPI1_SSEL4, P_SPI1_SSEL5, - P_SPI1_SSEL6, P_SPI1_SSEL7}, - - {P_SPI2_SSEL1, P_SPI2_SSEL2, P_SPI2_SSEL3, - P_SPI2_SSEL4, P_SPI2_SSEL5, - P_SPI2_SSEL6, P_SPI2_SSEL7}, -}; - -static int bfin_spi_setup(struct spi_device *spi) -{ - struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master); - struct bfin_spi_device *chip = spi_get_ctldata(spi); - u32 bfin_ctl_reg = SPI_CTL_ODM | SPI_CTL_PSSE; - int ret = -EINVAL; - - if (!chip) { - struct bfin_spi3_chip *chip_info = spi->controller_data; - - chip = kzalloc(sizeof(*chip), GFP_KERNEL); - if (!chip) { - dev_err(&spi->dev, "can not allocate chip data\n"); - return -ENOMEM; - } - if (chip_info) { - if (chip_info->control & ~bfin_ctl_reg) { - dev_err(&spi->dev, - "do not set bits that the SPI framework manages\n"); - goto error; - } - chip->control = chip_info->control; - chip->cs_chg_udelay = chip_info->cs_chg_udelay; - chip->tx_dummy_val = chip_info->tx_dummy_val; - chip->enable_dma = chip_info->enable_dma; - } - chip->cs = spi->chip_select; - if (chip->cs < MAX_CTRL_CS) { - chip->ssel = (1 << chip->cs) << 8; - ret = peripheral_request(ssel[spi->master->bus_num] - [chip->cs-1], dev_name(&spi->dev)); - if (ret) { - dev_err(&spi->dev, "peripheral_request() error\n"); - goto error; - } - } else { - chip->cs_gpio = chip->cs - MAX_CTRL_CS; - ret = gpio_request_one(chip->cs_gpio, GPIOF_OUT_INIT_HIGH, - dev_name(&spi->dev)); - if (ret) { - dev_err(&spi->dev, "gpio_request_one() error\n"); - goto error; - } - } - spi_set_ctldata(spi, chip); - } - - /* force a default base state */ - chip->control &= bfin_ctl_reg; - - if (spi->mode & SPI_CPOL) - chip->control |= SPI_CTL_CPOL; - if (spi->mode & SPI_CPHA) - chip->control |= SPI_CTL_CPHA; - if (spi->mode & SPI_LSB_FIRST) - chip->control |= SPI_CTL_LSBF; - chip->control |= SPI_CTL_MSTR; - /* we choose software to controll cs */ - chip->control &= ~SPI_CTL_ASSEL; - - chip->clock = hz_to_spi_clock(drv_data->sclk, spi->max_speed_hz); - - bfin_spi_cs_enable(drv_data, chip); - bfin_spi_cs_deactive(drv_data, chip); - - return 0; -error: - if (chip) { - kfree(chip); - spi_set_ctldata(spi, NULL); - } - - return ret; -} - -static void bfin_spi_cleanup(struct spi_device *spi) -{ - struct bfin_spi_device *chip = spi_get_ctldata(spi); - struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master); - - if (!chip) - return; - - if (chip->cs < MAX_CTRL_CS) { - peripheral_free(ssel[spi->master->bus_num] - [chip->cs-1]); - bfin_spi_cs_disable(drv_data, chip); - } else { - gpio_free(chip->cs_gpio); - } - - kfree(chip); - spi_set_ctldata(spi, NULL); -} - -static irqreturn_t bfin_spi_tx_dma_isr(int irq, void *dev_id) -{ - struct bfin_spi_master *drv_data = dev_id; - u32 dma_stat = get_dma_curr_irqstat(drv_data->tx_dma); - - clear_dma_irqstat(drv_data->tx_dma); - if (dma_stat & DMA_DONE) { - drv_data->tx_num++; - } else { - dev_err(&drv_data->master->dev, - "spi tx dma error: %d\n", dma_stat); - if (drv_data->tx) - drv_data->state = ERROR_STATE; - } - bfin_write_and(&drv_data->regs->tx_control, ~SPI_TXCTL_TDR_NF); - return IRQ_HANDLED; -} - -static irqreturn_t bfin_spi_rx_dma_isr(int irq, void *dev_id) -{ - struct bfin_spi_master *drv_data = dev_id; - struct spi_message *msg = drv_data->cur_msg; - u32 dma_stat = get_dma_curr_irqstat(drv_data->rx_dma); - - clear_dma_irqstat(drv_data->rx_dma); - if (dma_stat & DMA_DONE) { - drv_data->rx_num++; - /* we may fail on tx dma */ - if (drv_data->state != ERROR_STATE) - msg->actual_length += drv_data->transfer_len; - } else { - drv_data->state = ERROR_STATE; - dev_err(&drv_data->master->dev, - "spi rx dma error: %d\n", dma_stat); - } - bfin_write(&drv_data->regs->tx_control, 0); - bfin_write(&drv_data->regs->rx_control, 0); - if (drv_data->rx_num != drv_data->tx_num) - dev_dbg(&drv_data->master->dev, - "dma interrupt missing: tx=%d,rx=%d\n", - drv_data->tx_num, drv_data->rx_num); - tasklet_schedule(&drv_data->pump_transfers); - return IRQ_HANDLED; -} - -static int bfin_spi_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct bfin_spi3_master *info = dev_get_platdata(dev); - struct spi_master *master; - struct bfin_spi_master *drv_data; - struct resource *mem, *res; - unsigned int tx_dma, rx_dma; - unsigned long sclk; - int ret; - - if (!info) { - dev_err(dev, "platform data missing!\n"); - return -ENODEV; - } - - sclk = get_sclk1(); - if (!sclk) { - dev_err(dev, "can not get sclk1\n"); - return -ENXIO; - } - - res = platform_get_resource(pdev, IORESOURCE_DMA, 0); - if (!res) { - dev_err(dev, "can not get tx dma resource\n"); - return -ENXIO; - } - tx_dma = res->start; - - res = platform_get_resource(pdev, IORESOURCE_DMA, 1); - if (!res) { - dev_err(dev, "can not get rx dma resource\n"); - return -ENXIO; - } - rx_dma = res->start; - - /* allocate master with space for drv_data */ - master = spi_alloc_master(dev, sizeof(*drv_data)); - if (!master) { - dev_err(dev, "can not alloc spi_master\n"); - return -ENOMEM; - } - platform_set_drvdata(pdev, master); - - /* the mode bits supported by this driver */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; - - master->bus_num = pdev->id; - master->num_chipselect = info->num_chipselect; - master->cleanup = bfin_spi_cleanup; - master->setup = bfin_spi_setup; - master->transfer_one_message = bfin_spi_transfer_one_message; - master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1); - - drv_data = spi_master_get_devdata(master); - drv_data->master = master; - drv_data->tx_dma = tx_dma; - drv_data->rx_dma = rx_dma; - drv_data->pin_req = info->pin_req; - drv_data->sclk = sclk; - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - drv_data->regs = devm_ioremap_resource(dev, mem); - if (IS_ERR(drv_data->regs)) { - ret = PTR_ERR(drv_data->regs); - goto err_put_master; - } - - /* request tx and rx dma */ - ret = request_dma(tx_dma, "SPI_TX_DMA"); - if (ret) { - dev_err(dev, "can not request SPI TX DMA channel\n"); - goto err_put_master; - } - set_dma_callback(tx_dma, bfin_spi_tx_dma_isr, drv_data); - - ret = request_dma(rx_dma, "SPI_RX_DMA"); - if (ret) { - dev_err(dev, "can not request SPI RX DMA channel\n"); - goto err_free_tx_dma; - } - set_dma_callback(drv_data->rx_dma, bfin_spi_rx_dma_isr, drv_data); - - /* request CLK, MOSI and MISO */ - ret = peripheral_request_list(drv_data->pin_req, "bfin-spi3"); - if (ret < 0) { - dev_err(dev, "can not request spi pins\n"); - goto err_free_rx_dma; - } - - bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA); - bfin_write(&drv_data->regs->ssel, 0x0000FE00); - bfin_write(&drv_data->regs->delay, 0x0); - - tasklet_init(&drv_data->pump_transfers, - bfin_spi_pump_transfers, (unsigned long)drv_data); - /* register with the SPI framework */ - ret = spi_register_master(master); - if (ret) { - dev_err(dev, "can not register spi master\n"); - goto err_free_peripheral; - } - - return ret; - -err_free_peripheral: - peripheral_free_list(drv_data->pin_req); -err_free_rx_dma: - free_dma(rx_dma); -err_free_tx_dma: - free_dma(tx_dma); -err_put_master: - spi_master_put(master); - - return ret; -} - -static int bfin_spi_remove(struct platform_device *pdev) -{ - struct spi_master *master = platform_get_drvdata(pdev); - struct bfin_spi_master *drv_data = spi_master_get_devdata(master); - - bfin_spi_disable(drv_data); - - peripheral_free_list(drv_data->pin_req); - free_dma(drv_data->rx_dma); - free_dma(drv_data->tx_dma); - - spi_unregister_master(drv_data->master); - return 0; -} - -#ifdef CONFIG_PM -static int bfin_spi_suspend(struct device *dev) -{ - struct spi_master *master = dev_get_drvdata(dev); - struct bfin_spi_master *drv_data = spi_master_get_devdata(master); - - spi_master_suspend(master); - - drv_data->control = bfin_read(&drv_data->regs->control); - drv_data->ssel = bfin_read(&drv_data->regs->ssel); - - bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA); - bfin_write(&drv_data->regs->ssel, 0x0000FE00); - dma_disable_irq(drv_data->rx_dma); - dma_disable_irq(drv_data->tx_dma); - - return 0; -} - -static int bfin_spi_resume(struct device *dev) -{ - struct spi_master *master = dev_get_drvdata(dev); - struct bfin_spi_master *drv_data = spi_master_get_devdata(master); - int ret = 0; - - /* bootrom may modify spi and dma status when resume in spi boot mode */ - disable_dma(drv_data->rx_dma); - - dma_enable_irq(drv_data->rx_dma); - dma_enable_irq(drv_data->tx_dma); - bfin_write(&drv_data->regs->control, drv_data->control); - bfin_write(&drv_data->regs->ssel, drv_data->ssel); - - ret = spi_master_resume(master); - if (ret) { - free_dma(drv_data->rx_dma); - free_dma(drv_data->tx_dma); - } - - return ret; -} -#endif -static const struct dev_pm_ops bfin_spi_pm_ops = { - SET_SYSTEM_SLEEP_PM_OPS(bfin_spi_suspend, bfin_spi_resume) -}; - -MODULE_ALIAS("platform:bfin-spi3"); -static struct platform_driver bfin_spi_driver = { - .driver = { - .name = "bfin-spi3", - .owner = THIS_MODULE, - .pm = &bfin_spi_pm_ops, - }, - .remove = bfin_spi_remove, -}; - -module_platform_driver_probe(bfin_spi_driver, bfin_spi_probe); - -MODULE_DESCRIPTION("Analog Devices SPI3 controller driver"); -MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>"); -MODULE_LICENSE("GPL v2"); |