diff options
Diffstat (limited to 'drivers/spi/spi-bfin-sport.c')
| -rw-r--r-- | drivers/spi/spi-bfin-sport.c | 919 |
1 files changed, 0 insertions, 919 deletions
diff --git a/drivers/spi/spi-bfin-sport.c b/drivers/spi/spi-bfin-sport.c deleted file mode 100644 index 01d0ba9c5942..000000000000 --- a/drivers/spi/spi-bfin-sport.c +++ /dev/null @@ -1,919 +0,0 @@ -/* - * SPI bus via the Blackfin SPORT peripheral - * - * Enter bugs at http://blackfin.uclinux.org/ - * - * Copyright 2009-2011 Analog Devices Inc. - * - * Licensed under the GPL-2 or later. - */ - -#include <linux/module.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/gpio.h> -#include <linux/io.h> -#include <linux/ioport.h> -#include <linux/irq.h> -#include <linux/errno.h> -#include <linux/interrupt.h> -#include <linux/platform_device.h> -#include <linux/spi/spi.h> -#include <linux/workqueue.h> - -#include <asm/portmux.h> -#include <asm/bfin5xx_spi.h> -#include <asm/blackfin.h> -#include <asm/bfin_sport.h> -#include <asm/cacheflush.h> - -#define DRV_NAME "bfin-sport-spi" -#define DRV_DESC "SPI bus via the Blackfin SPORT" - -MODULE_AUTHOR("Cliff Cai"); -MODULE_DESCRIPTION(DRV_DESC); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:bfin-sport-spi"); - -enum bfin_sport_spi_state { - START_STATE, - RUNNING_STATE, - DONE_STATE, - ERROR_STATE, -}; - -struct bfin_sport_spi_master_data; - -struct bfin_sport_transfer_ops { - void (*write) (struct bfin_sport_spi_master_data *); - void (*read) (struct bfin_sport_spi_master_data *); - void (*duplex) (struct bfin_sport_spi_master_data *); -}; - -struct bfin_sport_spi_master_data { - /* Driver model hookup */ - struct device *dev; - - /* SPI framework hookup */ - struct spi_master *master; - - /* Regs base of SPI controller */ - struct sport_register __iomem *regs; - int err_irq; - - /* Pin request list */ - u16 *pin_req; - - struct work_struct pump_messages; - spinlock_t lock; - struct list_head queue; - int busy; - bool run; - - /* Message Transfer pump */ - struct tasklet_struct pump_transfers; - - /* Current message transfer state info */ - enum bfin_sport_spi_state state; - struct spi_message *cur_msg; - struct spi_transfer *cur_transfer; - struct bfin_sport_spi_slave_data *cur_chip; - union { - void *tx; - u8 *tx8; - u16 *tx16; - }; - void *tx_end; - union { - void *rx; - u8 *rx8; - u16 *rx16; - }; - void *rx_end; - - int cs_change; - struct bfin_sport_transfer_ops *ops; -}; - -struct bfin_sport_spi_slave_data { - u16 ctl_reg; - u16 baud; - u16 cs_chg_udelay; /* Some devices require > 255usec delay */ - u32 cs_gpio; - u16 idle_tx_val; - struct bfin_sport_transfer_ops *ops; -}; - -static void -bfin_sport_spi_enable(struct bfin_sport_spi_master_data *drv_data) -{ - bfin_write_or(&drv_data->regs->tcr1, TSPEN); - bfin_write_or(&drv_data->regs->rcr1, TSPEN); - SSYNC(); -} - -static void -bfin_sport_spi_disable(struct bfin_sport_spi_master_data *drv_data) -{ - bfin_write_and(&drv_data->regs->tcr1, ~TSPEN); - bfin_write_and(&drv_data->regs->rcr1, ~TSPEN); - SSYNC(); -} - -/* Caculate the SPI_BAUD register value based on input HZ */ -static u16 -bfin_sport_hz_to_spi_baud(u32 speed_hz) -{ - u_long clk, sclk = get_sclk(); - int div = (sclk / (2 * speed_hz)) - 1; - - if (div < 0) - div = 0; - - clk = sclk / (2 * (div + 1)); - - if (clk > speed_hz) - div++; - - return div; -} - -/* Chip select operation functions for cs_change flag */ -static void -bfin_sport_spi_cs_active(struct bfin_sport_spi_slave_data *chip) -{ - gpio_direction_output(chip->cs_gpio, 0); -} - -static void -bfin_sport_spi_cs_deactive(struct bfin_sport_spi_slave_data *chip) -{ - gpio_direction_output(chip->cs_gpio, 1); - /* Move delay here for consistency */ - if (chip->cs_chg_udelay) - udelay(chip->cs_chg_udelay); -} - -static void -bfin_sport_spi_stat_poll_complete(struct bfin_sport_spi_master_data *drv_data) -{ - unsigned long timeout = jiffies + HZ; - while (!(bfin_read(&drv_data->regs->stat) & RXNE)) { - if (!time_before(jiffies, timeout)) - break; - } -} - -static void -bfin_sport_spi_u8_writer(struct bfin_sport_spi_master_data *drv_data) -{ - u16 dummy; - - while (drv_data->tx < drv_data->tx_end) { - bfin_write(&drv_data->regs->tx16, *drv_data->tx8++); - bfin_sport_spi_stat_poll_complete(drv_data); - dummy = bfin_read(&drv_data->regs->rx16); - } -} - -static void -bfin_sport_spi_u8_reader(struct bfin_sport_spi_master_data *drv_data) -{ - u16 tx_val = drv_data->cur_chip->idle_tx_val; - - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tx16, tx_val); - bfin_sport_spi_stat_poll_complete(drv_data); - *drv_data->rx8++ = bfin_read(&drv_data->regs->rx16); - } -} - -static void -bfin_sport_spi_u8_duplex(struct bfin_sport_spi_master_data *drv_data) -{ - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tx16, *drv_data->tx8++); - bfin_sport_spi_stat_poll_complete(drv_data); - *drv_data->rx8++ = bfin_read(&drv_data->regs->rx16); - } -} - -static struct bfin_sport_transfer_ops bfin_sport_transfer_ops_u8 = { - .write = bfin_sport_spi_u8_writer, - .read = bfin_sport_spi_u8_reader, - .duplex = bfin_sport_spi_u8_duplex, -}; - -static void -bfin_sport_spi_u16_writer(struct bfin_sport_spi_master_data *drv_data) -{ - u16 dummy; - - while (drv_data->tx < drv_data->tx_end) { - bfin_write(&drv_data->regs->tx16, *drv_data->tx16++); - bfin_sport_spi_stat_poll_complete(drv_data); - dummy = bfin_read(&drv_data->regs->rx16); - } -} - -static void -bfin_sport_spi_u16_reader(struct bfin_sport_spi_master_data *drv_data) -{ - u16 tx_val = drv_data->cur_chip->idle_tx_val; - - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tx16, tx_val); - bfin_sport_spi_stat_poll_complete(drv_data); - *drv_data->rx16++ = bfin_read(&drv_data->regs->rx16); - } -} - -static void -bfin_sport_spi_u16_duplex(struct bfin_sport_spi_master_data *drv_data) -{ - while (drv_data->rx < drv_data->rx_end) { - bfin_write(&drv_data->regs->tx16, *drv_data->tx16++); - bfin_sport_spi_stat_poll_complete(drv_data); - *drv_data->rx16++ = bfin_read(&drv_data->regs->rx16); - } -} - -static struct bfin_sport_transfer_ops bfin_sport_transfer_ops_u16 = { - .write = bfin_sport_spi_u16_writer, - .read = bfin_sport_spi_u16_reader, - .duplex = bfin_sport_spi_u16_duplex, -}; - -/* stop controller and re-config current chip */ -static void -bfin_sport_spi_restore_state(struct bfin_sport_spi_master_data *drv_data) -{ - struct bfin_sport_spi_slave_data *chip = drv_data->cur_chip; - - bfin_sport_spi_disable(drv_data); - dev_dbg(drv_data->dev, "restoring spi ctl state\n"); - - bfin_write(&drv_data->regs->tcr1, chip->ctl_reg); - bfin_write(&drv_data->regs->tclkdiv, chip->baud); - SSYNC(); - - bfin_write(&drv_data->regs->rcr1, chip->ctl_reg & ~(ITCLK | ITFS)); - SSYNC(); - - bfin_sport_spi_cs_active(chip); -} - -/* test if there is more transfer to be done */ -static enum bfin_sport_spi_state -bfin_sport_spi_next_transfer(struct bfin_sport_spi_master_data *drv_data) -{ - struct spi_message *msg = drv_data->cur_msg; - struct spi_transfer *trans = drv_data->cur_transfer; - - /* Move to next transfer */ - if (trans->transfer_list.next != &msg->transfers) { - drv_data->cur_transfer = - list_entry(trans->transfer_list.next, - struct spi_transfer, transfer_list); - return RUNNING_STATE; - } - - return DONE_STATE; -} - -/* - * caller already set message->status; - * dma and pio irqs are blocked give finished message back - */ -static void -bfin_sport_spi_giveback(struct bfin_sport_spi_master_data *drv_data) -{ - struct bfin_sport_spi_slave_data *chip = drv_data->cur_chip; - unsigned long flags; - struct spi_message *msg; - - spin_lock_irqsave(&drv_data->lock, flags); - msg = drv_data->cur_msg; - drv_data->state = START_STATE; - drv_data->cur_msg = NULL; - drv_data->cur_transfer = NULL; - drv_data->cur_chip = NULL; - schedule_work(&drv_data->pump_messages); - spin_unlock_irqrestore(&drv_data->lock, flags); - - if (!drv_data->cs_change) - bfin_sport_spi_cs_deactive(chip); - - if (msg->complete) - msg->complete(msg->context); -} - -static irqreturn_t -sport_err_handler(int irq, void *dev_id) -{ - struct bfin_sport_spi_master_data *drv_data = dev_id; - u16 status; - - dev_dbg(drv_data->dev, "%s enter\n", __func__); - status = bfin_read(&drv_data->regs->stat) & (TOVF | TUVF | ROVF | RUVF); - - if (status) { - bfin_write(&drv_data->regs->stat, status); - SSYNC(); - - bfin_sport_spi_disable(drv_data); - dev_err(drv_data->dev, "status error:%s%s%s%s\n", - status & TOVF ? " TOVF" : "", - status & TUVF ? " TUVF" : "", - status & ROVF ? " ROVF" : "", - status & RUVF ? " RUVF" : ""); - } - - return IRQ_HANDLED; -} - -static void -bfin_sport_spi_pump_transfers(unsigned long data) -{ - struct bfin_sport_spi_master_data *drv_data = (void *)data; - struct spi_message *message = NULL; - struct spi_transfer *transfer = NULL; - struct spi_transfer *previous = NULL; - struct bfin_sport_spi_slave_data *chip = NULL; - unsigned int bits_per_word; - u32 tranf_success = 1; - u32 transfer_speed; - u8 full_duplex = 0; - - /* Get current state information */ - message = drv_data->cur_msg; - transfer = drv_data->cur_transfer; - chip = drv_data->cur_chip; - - transfer_speed = bfin_sport_hz_to_spi_baud(transfer->speed_hz); - bfin_write(&drv_data->regs->tclkdiv, transfer_speed); - SSYNC(); - - /* - * if msg is error or done, report it back using complete() callback - */ - - /* Handle for abort */ - if (drv_data->state == ERROR_STATE) { - dev_dbg(drv_data->dev, "transfer: we've hit an error\n"); - message->status = -EIO; - bfin_sport_spi_giveback(drv_data); - return; - } - - /* Handle end of message */ - if (drv_data->state == DONE_STATE) { - dev_dbg(drv_data->dev, "transfer: all done!\n"); - message->status = 0; - bfin_sport_spi_giveback(drv_data); - return; - } - - /* Delay if requested at end of transfer */ - if (drv_data->state == RUNNING_STATE) { - dev_dbg(drv_data->dev, "transfer: still running ...\n"); - previous = list_entry(transfer->transfer_list.prev, - struct spi_transfer, transfer_list); - if (previous->delay_usecs) - udelay(previous->delay_usecs); - } - - if (transfer->len == 0) { - /* Move to next transfer of this msg */ - drv_data->state = bfin_sport_spi_next_transfer(drv_data); - /* Schedule next transfer tasklet */ - tasklet_schedule(&drv_data->pump_transfers); - } - - if (transfer->tx_buf != NULL) { - drv_data->tx = (void *)transfer->tx_buf; - drv_data->tx_end = drv_data->tx + transfer->len; - dev_dbg(drv_data->dev, "tx_buf is %p, tx_end is %p\n", - transfer->tx_buf, drv_data->tx_end); - } else - drv_data->tx = NULL; - - if (transfer->rx_buf != NULL) { - full_duplex = transfer->tx_buf != NULL; - drv_data->rx = transfer->rx_buf; - drv_data->rx_end = drv_data->rx + transfer->len; - dev_dbg(drv_data->dev, "rx_buf is %p, rx_end is %p\n", - transfer->rx_buf, drv_data->rx_end); - } else - drv_data->rx = NULL; - - drv_data->cs_change = transfer->cs_change; - - /* Bits per word setup */ - bits_per_word = transfer->bits_per_word; - if (bits_per_word == 16) - drv_data->ops = &bfin_sport_transfer_ops_u16; - else - drv_data->ops = &bfin_sport_transfer_ops_u8; - bfin_write(&drv_data->regs->tcr2, bits_per_word - 1); - bfin_write(&drv_data->regs->tfsdiv, bits_per_word - 1); - bfin_write(&drv_data->regs->rcr2, bits_per_word - 1); - - drv_data->state = RUNNING_STATE; - - if (drv_data->cs_change) - bfin_sport_spi_cs_active(chip); - - dev_dbg(drv_data->dev, - "now pumping a transfer: width is %d, len is %d\n", - bits_per_word, transfer->len); - - /* PIO mode write then read */ - dev_dbg(drv_data->dev, "doing IO transfer\n"); - - bfin_sport_spi_enable(drv_data); - if (full_duplex) { - /* full duplex mode */ - BUG_ON((drv_data->tx_end - drv_data->tx) != - (drv_data->rx_end - drv_data->rx)); - drv_data->ops->duplex(drv_data); - - if (drv_data->tx != drv_data->tx_end) - tranf_success = 0; - } else if (drv_data->tx != NULL) { - /* write only half duplex */ - - drv_data->ops->write(drv_data); - - if (drv_data->tx != drv_data->tx_end) - tranf_success = 0; - } else if (drv_data->rx != NULL) { - /* read only half duplex */ - - drv_data->ops->read(drv_data); - if (drv_data->rx != drv_data->rx_end) - tranf_success = 0; - } - bfin_sport_spi_disable(drv_data); - - if (!tranf_success) { - dev_dbg(drv_data->dev, "IO write error!\n"); - drv_data->state = ERROR_STATE; - } else { - /* Update total byte transferred */ - message->actual_length += transfer->len; - /* Move to next transfer of this msg */ - drv_data->state = bfin_sport_spi_next_transfer(drv_data); - if (drv_data->cs_change) - bfin_sport_spi_cs_deactive(chip); - } - - /* Schedule next transfer tasklet */ - tasklet_schedule(&drv_data->pump_transfers); -} - -/* pop a msg from queue and kick off real transfer */ -static void -bfin_sport_spi_pump_messages(struct work_struct *work) -{ - struct bfin_sport_spi_master_data *drv_data; - unsigned long flags; - struct spi_message *next_msg; - - drv_data = container_of(work, struct bfin_sport_spi_master_data, pump_messages); - - /* Lock queue and check for queue work */ - spin_lock_irqsave(&drv_data->lock, flags); - if (list_empty(&drv_data->queue) || !drv_data->run) { - /* pumper kicked off but no work to do */ - drv_data->busy = 0; - spin_unlock_irqrestore(&drv_data->lock, flags); - return; - } - - /* Make sure we are not already running a message */ - if (drv_data->cur_msg) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return; - } - - /* Extract head of queue */ - next_msg = list_entry(drv_data->queue.next, - struct spi_message, queue); - - drv_data->cur_msg = next_msg; - - /* Setup the SSP using the per chip configuration */ - drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); - - list_del_init(&drv_data->cur_msg->queue); - - /* Initialize message state */ - drv_data->cur_msg->state = START_STATE; - drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, - struct spi_transfer, transfer_list); - bfin_sport_spi_restore_state(drv_data); - dev_dbg(drv_data->dev, "got a message to pump, " - "state is set to: baud %d, cs_gpio %i, ctl 0x%x\n", - drv_data->cur_chip->baud, drv_data->cur_chip->cs_gpio, - drv_data->cur_chip->ctl_reg); - - dev_dbg(drv_data->dev, - "the first transfer len is %d\n", - drv_data->cur_transfer->len); - - /* Mark as busy and launch transfers */ - tasklet_schedule(&drv_data->pump_transfers); - - drv_data->busy = 1; - spin_unlock_irqrestore(&drv_data->lock, flags); -} - -/* - * got a msg to transfer, queue it in drv_data->queue. - * And kick off message pumper - */ -static int -bfin_sport_spi_transfer(struct spi_device *spi, struct spi_message *msg) -{ - struct bfin_sport_spi_master_data *drv_data = spi_master_get_devdata(spi->master); - unsigned long flags; - - spin_lock_irqsave(&drv_data->lock, flags); - - if (!drv_data->run) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return -ESHUTDOWN; - } - - msg->actual_length = 0; - msg->status = -EINPROGRESS; - msg->state = START_STATE; - - dev_dbg(&spi->dev, "adding an msg in transfer()\n"); - list_add_tail(&msg->queue, &drv_data->queue); - - if (drv_data->run && !drv_data->busy) - schedule_work(&drv_data->pump_messages); - - spin_unlock_irqrestore(&drv_data->lock, flags); - - return 0; -} - -/* Called every time common spi devices change state */ -static int -bfin_sport_spi_setup(struct spi_device *spi) -{ - struct bfin_sport_spi_slave_data *chip, *first = NULL; - int ret; - - /* Only alloc (or use chip_info) on first setup */ - chip = spi_get_ctldata(spi); - if (chip == NULL) { - struct bfin5xx_spi_chip *chip_info; - - chip = first = kzalloc(sizeof(*chip), GFP_KERNEL); - if (!chip) - return -ENOMEM; - - /* platform chip_info isn't required */ - chip_info = spi->controller_data; - if (chip_info) { - /* - * DITFS and TDTYPE are only thing we don't set, but - * they probably shouldn't be changed by people. - */ - if (chip_info->ctl_reg || chip_info->enable_dma) { - ret = -EINVAL; - dev_err(&spi->dev, "don't set ctl_reg/enable_dma fields\n"); - goto error; - } - chip->cs_chg_udelay = chip_info->cs_chg_udelay; - chip->idle_tx_val = chip_info->idle_tx_val; - } - } - - /* translate common spi framework into our register - * following configure contents are same for tx and rx. - */ - - if (spi->mode & SPI_CPHA) - chip->ctl_reg &= ~TCKFE; - else - chip->ctl_reg |= TCKFE; - - if (spi->mode & SPI_LSB_FIRST) - chip->ctl_reg |= TLSBIT; - else - chip->ctl_reg &= ~TLSBIT; - - /* Sport in master mode */ - chip->ctl_reg |= ITCLK | ITFS | TFSR | LATFS | LTFS; - - chip->baud = bfin_sport_hz_to_spi_baud(spi->max_speed_hz); - - chip->cs_gpio = spi->chip_select; - ret = gpio_request(chip->cs_gpio, spi->modalias); - if (ret) - goto error; - - dev_dbg(&spi->dev, "setup spi chip %s, width is %d\n", - spi->modalias, spi->bits_per_word); - dev_dbg(&spi->dev, "ctl_reg is 0x%x, GPIO is %i\n", - chip->ctl_reg, spi->chip_select); - - spi_set_ctldata(spi, chip); - - bfin_sport_spi_cs_deactive(chip); - - return ret; - - error: - kfree(first); - return ret; -} - -/* - * callback for spi framework. - * clean driver specific data - */ -static void -bfin_sport_spi_cleanup(struct spi_device *spi) -{ - struct bfin_sport_spi_slave_data *chip = spi_get_ctldata(spi); - - if (!chip) - return; - - gpio_free(chip->cs_gpio); - - kfree(chip); -} - -static int -bfin_sport_spi_init_queue(struct bfin_sport_spi_master_data *drv_data) -{ - INIT_LIST_HEAD(&drv_data->queue); - spin_lock_init(&drv_data->lock); - - drv_data->run = false; - drv_data->busy = 0; - - /* init transfer tasklet */ - tasklet_init(&drv_data->pump_transfers, - bfin_sport_spi_pump_transfers, (unsigned long)drv_data); - - INIT_WORK(&drv_data->pump_messages, bfin_sport_spi_pump_messages); - - return 0; -} - -static int -bfin_sport_spi_start_queue(struct bfin_sport_spi_master_data *drv_data) -{ - unsigned long flags; - - spin_lock_irqsave(&drv_data->lock, flags); - - if (drv_data->run || drv_data->busy) { - spin_unlock_irqrestore(&drv_data->lock, flags); - return -EBUSY; - } - - drv_data->run = true; - drv_data->cur_msg = NULL; - drv_data->cur_transfer = NULL; - drv_data->cur_chip = NULL; - spin_unlock_irqrestore(&drv_data->lock, flags); - - schedule_work(&drv_data->pump_messages); - - return 0; -} - -static inline int -bfin_sport_spi_stop_queue(struct bfin_sport_spi_master_data *drv_data) -{ - unsigned long flags; - unsigned limit = 500; - int status = 0; - - spin_lock_irqsave(&drv_data->lock, flags); - - /* - * This is a bit lame, but is optimized for the common execution path. - * A wait_queue on the drv_data->busy could be used, but then the common - * execution path (pump_messages) would be required to call wake_up or - * friends on every SPI message. Do this instead - */ - drv_data->run = false; - while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) { - spin_unlock_irqrestore(&drv_data->lock, flags); - msleep(10); - spin_lock_irqsave(&drv_data->lock, flags); - } - - if (!list_empty(&drv_data->queue) || drv_data->busy) - status = -EBUSY; - - spin_unlock_irqrestore(&drv_data->lock, flags); - - return status; -} - -static inline int -bfin_sport_spi_destroy_queue(struct bfin_sport_spi_master_data *drv_data) -{ - int status; - - status = bfin_sport_spi_stop_queue(drv_data); - if (status) - return status; - - flush_work(&drv_data->pump_messages); - - return 0; -} - -static int bfin_sport_spi_probe(struct platform_device *pdev) -{ - struct device *dev = &pdev->dev; - struct bfin5xx_spi_master *platform_info; - struct spi_master *master; - struct resource *res, *ires; - struct bfin_sport_spi_master_data *drv_data; - int status; - - platform_info = dev_get_platdata(dev); - - /* Allocate master with space for drv_data */ - master = spi_alloc_master(dev, sizeof(*master) + 16); - if (!master) { - dev_err(dev, "cannot alloc spi_master\n"); - return -ENOMEM; - } - - drv_data = spi_master_get_devdata(master); - drv_data->master = master; - drv_data->dev = dev; - drv_data->pin_req = platform_info->pin_req; - - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; - master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); - master->bus_num = pdev->id; - master->num_chipselect = platform_info->num_chipselect; - master->cleanup = bfin_sport_spi_cleanup; - master->setup = bfin_sport_spi_setup; - master->transfer = bfin_sport_spi_transfer; - - /* Find and map our resources */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (res == NULL) { - dev_err(dev, "cannot get IORESOURCE_MEM\n"); - status = -ENOENT; - goto out_error_get_res; - } - - drv_data->regs = ioremap(res->start, resource_size(res)); - if (drv_data->regs == NULL) { - dev_err(dev, "cannot map registers\n"); - status = -ENXIO; - goto out_error_ioremap; - } - - ires = platform_get_resource(pdev, IORESOURCE_IRQ, 0); - if (!ires) { - dev_err(dev, "cannot get IORESOURCE_IRQ\n"); - status = -ENODEV; - goto out_error_get_ires; - } - drv_data->err_irq = ires->start; - - /* Initial and start queue */ - status = bfin_sport_spi_init_queue(drv_data); - if (status) { - dev_err(dev, "problem initializing queue\n"); - goto out_error_queue_alloc; - } - - status = bfin_sport_spi_start_queue(drv_data); - if (status) { - dev_err(dev, "problem starting queue\n"); - goto out_error_queue_alloc; - } - - status = request_irq(drv_data->err_irq, sport_err_handler, - 0, "sport_spi_err", drv_data); - if (status) { - dev_err(dev, "unable to request sport err irq\n"); - goto out_error_irq; - } - - status = peripheral_request_list(drv_data->pin_req, DRV_NAME); - if (status) { - dev_err(dev, "requesting peripherals failed\n"); - goto out_error_peripheral; - } - - /* Register with the SPI framework */ - platform_set_drvdata(pdev, drv_data); - status = spi_register_master(master); - if (status) { - dev_err(dev, "problem registering spi master\n"); - goto out_error_master; - } - - dev_info(dev, "%s, regs_base@%p\n", DRV_DESC, drv_data->regs); - return 0; - - out_error_master: - peripheral_free_list(drv_data->pin_req); - out_error_peripheral: - free_irq(drv_data->err_irq, drv_data); - out_error_irq: - out_error_queue_alloc: - bfin_sport_spi_destroy_queue(drv_data); - out_error_get_ires: - iounmap(drv_data->regs); - out_error_ioremap: - out_error_get_res: - spi_master_put(master); - - return status; -} - -/* stop hardware and remove the driver */ -static int bfin_sport_spi_remove(struct platform_device *pdev) -{ - struct bfin_sport_spi_master_data *drv_data = platform_get_drvdata(pdev); - int status = 0; - - if (!drv_data) - return 0; - - /* Remove the queue */ - status = bfin_sport_spi_destroy_queue(drv_data); - if (status) - return status; - - /* Disable the SSP at the peripheral and SOC level */ - bfin_sport_spi_disable(drv_data); - - /* Disconnect from the SPI framework */ - spi_unregister_master(drv_data->master); - - peripheral_free_list(drv_data->pin_req); - - return 0; -} - -#ifdef CONFIG_PM_SLEEP -static int bfin_sport_spi_suspend(struct device *dev) -{ - struct bfin_sport_spi_master_data *drv_data = dev_get_drvdata(dev); - int status; - - status = bfin_sport_spi_stop_queue(drv_data); - if (status) - return status; - - /* stop hardware */ - bfin_sport_spi_disable(drv_data); - - return status; -} - -static int bfin_sport_spi_resume(struct device *dev) -{ - struct bfin_sport_spi_master_data *drv_data = dev_get_drvdata(dev); - int status; - - /* Enable the SPI interface */ - bfin_sport_spi_enable(drv_data); - - /* Start the queue running */ - status = bfin_sport_spi_start_queue(drv_data); - if (status) - dev_err(drv_data->dev, "problem resuming queue\n"); - - return status; -} - -static SIMPLE_DEV_PM_OPS(bfin_sport_spi_pm_ops, bfin_sport_spi_suspend, - bfin_sport_spi_resume); - -#define BFIN_SPORT_SPI_PM_OPS (&bfin_sport_spi_pm_ops) -#else -#define BFIN_SPORT_SPI_PM_OPS NULL -#endif - -static struct platform_driver bfin_sport_spi_driver = { - .driver = { - .name = DRV_NAME, - .pm = BFIN_SPORT_SPI_PM_OPS, - }, - .probe = bfin_sport_spi_probe, - .remove = bfin_sport_spi_remove, -}; -module_platform_driver(bfin_sport_spi_driver); |