/* * dw_spi.c - Designware SPI core controller driver (refer pxa2xx_spi.c) * * Copyright (c) 2009, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope 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 <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/highmem.h> #include <linux/delay.h> #include <linux/slab.h> #include <linux/spi/dw_spi.h> #include <linux/spi/spi.h> #ifdef CONFIG_DEBUG_FS #include <linux/debugfs.h> #endif #define START_STATE ((void *)0) #define RUNNING_STATE ((void *)1) #define DONE_STATE ((void *)2) #define ERROR_STATE ((void *)-1) #define QUEUE_RUNNING 0 #define QUEUE_STOPPED 1 #define MRST_SPI_DEASSERT 0 #define MRST_SPI_ASSERT 1 /* Slave spi_dev related */ struct chip_data { u16 cr0; u8 cs; /* chip select pin */ u8 n_bytes; /* current is a 1/2/4 byte op */ u8 tmode; /* TR/TO/RO/EEPROM */ u8 type; /* SPI/SSP/MicroWire */ u8 poll_mode; /* 1 means use poll mode */ u32 dma_width; u32 rx_threshold; u32 tx_threshold; u8 enable_dma; u8 bits_per_word; u16 clk_div; /* baud rate divider */ u32 speed_hz; /* baud rate */ int (*write)(struct dw_spi *dws); int (*read)(struct dw_spi *dws); void (*cs_control)(u32 command); }; #ifdef CONFIG_DEBUG_FS static int spi_show_regs_open(struct inode *inode, struct file *file) { file->private_data = inode->i_private; return 0; } #define SPI_REGS_BUFSIZE 1024 static ssize_t spi_show_regs(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { struct dw_spi *dws; char *buf; u32 len = 0; ssize_t ret; dws = file->private_data; buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL); if (!buf) return 0; len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "MRST SPI0 registers:\n"); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "=================================\n"); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "CTRL0: \t\t0x%08x\n", dw_readl(dws, ctrl0)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "CTRL1: \t\t0x%08x\n", dw_readl(dws, ctrl1)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "SSIENR: \t0x%08x\n", dw_readl(dws, ssienr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "SER: \t\t0x%08x\n", dw_readl(dws, ser)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "BAUDR: \t\t0x%08x\n", dw_readl(dws, baudr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "TXFTLR: \t0x%08x\n", dw_readl(dws, txfltr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "RXFTLR: \t0x%08x\n", dw_readl(dws, rxfltr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "TXFLR: \t\t0x%08x\n", dw_readl(dws, txflr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "RXFLR: \t\t0x%08x\n", dw_readl(dws, rxflr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "SR: \t\t0x%08x\n", dw_readl(dws, sr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "IMR: \t\t0x%08x\n", dw_readl(dws, imr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "ISR: \t\t0x%08x\n", dw_readl(dws, isr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "DMACR: \t\t0x%08x\n", dw_readl(dws, dmacr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "DMATDLR: \t0x%08x\n", dw_readl(dws, dmatdlr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "DMARDLR: \t0x%08x\n", dw_readl(dws, dmardlr)); len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, "=================================\n"); ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); kfree(buf); return ret; } static const struct file_operations mrst_spi_regs_ops = { .owner = THIS_MODULE, .open = spi_show_regs_open, .read = spi_show_regs, .llseek = default_llseek, }; static int mrst_spi_debugfs_init(struct dw_spi *dws) { dws->debugfs = debugfs_create_dir("mrst_spi", NULL); if (!dws->debugfs) return -ENOMEM; debugfs_create_file("registers", S_IFREG | S_IRUGO, dws->debugfs, (void *)dws, &mrst_spi_regs_ops); return 0; } static void mrst_spi_debugfs_remove(struct dw_spi *dws) { if (dws->debugfs) debugfs_remove_recursive(dws->debugfs); } #else static inline int mrst_spi_debugfs_init(struct dw_spi *dws) { return 0; } static inline void mrst_spi_debugfs_remove(struct dw_spi *dws) { } #endif /* CONFIG_DEBUG_FS */ static void wait_till_not_busy(struct dw_spi *dws) { unsigned long end = jiffies + 1 + usecs_to_jiffies(1000); while (time_before(jiffies, end)) { if (!(dw_readw(dws, sr) & SR_BUSY)) return; } dev_err(&dws->master->dev, "DW SPI: Status keeps busy for 1000us after a read/write!\n"); } static void flush(struct dw_spi *dws) { while (dw_readw(dws, sr) & SR_RF_NOT_EMPT) dw_readw(dws, dr); wait_till_not_busy(dws); } static int null_writer(struct dw_spi *dws) { u8 n_bytes = dws->n_bytes; if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL) || (dws->tx == dws->tx_end)) return 0; dw_writew(dws, dr, 0); dws->tx += n_bytes; wait_till_not_busy(dws); return 1; } static int null_reader(struct dw_spi *dws) { u8 n_bytes = dws->n_bytes; while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT) && (dws->rx < dws->rx_end)) { dw_readw(dws, dr); dws->rx += n_bytes; } wait_till_not_busy(dws); return dws->rx == dws->rx_end; } static int u8_writer(struct dw_spi *dws) { if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL) || (dws->tx == dws->tx_end)) return 0; dw_writew(dws, dr, *(u8 *)(dws->tx)); ++dws->tx; wait_till_not_busy(dws); return 1; } static int u8_reader(struct dw_spi *dws) { while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT) && (dws->rx < dws->rx_end)) { *(u8 *)(dws->rx) = dw_readw(dws, dr); ++dws->rx; } wait_till_not_busy(dws); return dws->rx == dws->rx_end; } static int u16_writer(struct dw_spi *dws) { if (!(dw_readw(dws, sr) & SR_TF_NOT_FULL) || (dws->tx == dws->tx_end)) return 0; dw_writew(dws, dr, *(u16 *)(dws->tx)); dws->tx += 2; wait_till_not_busy(dws); return 1; } static int u16_reader(struct dw_spi *dws) { u16 temp; while ((dw_readw(dws, sr) & SR_RF_NOT_EMPT) && (dws->rx < dws->rx_end)) { temp = dw_readw(dws, dr); *(u16 *)(dws->rx) = temp; dws->rx += 2; } wait_till_not_busy(dws); return dws->rx == dws->rx_end; } static void *next_transfer(struct dw_spi *dws) { struct spi_message *msg = dws->cur_msg; struct spi_transfer *trans = dws->cur_transfer; /* Move to next transfer */ if (trans->transfer_list.next != &msg->transfers) { dws->cur_transfer = list_entry(trans->transfer_list.next, struct spi_transfer, transfer_list); return RUNNING_STATE; } else return DONE_STATE; } /* * Note: first step is the protocol driver prepares * a dma-capable memory, and this func just need translate * the virt addr to physical */ static int map_dma_buffers(struct dw_spi *dws) { if (!dws->cur_msg->is_dma_mapped || !dws->dma_inited || !dws->cur_chip->enable_dma) return 0; if (dws->cur_transfer->tx_dma) dws->tx_dma = dws->cur_transfer->tx_dma; if (dws->cur_transfer->rx_dma) dws->rx_dma = dws->cur_transfer->rx_dma; return 1; } /* Caller already set message->status; dma and pio irqs are blocked */ static void giveback(struct dw_spi *dws) { struct spi_transfer *last_transfer; unsigned long flags; struct spi_message *msg; spin_lock_irqsave(&dws->lock, flags); msg = dws->cur_msg; dws->cur_msg = NULL; dws->cur_transfer = NULL; dws->prev_chip = dws->cur_chip; dws->cur_chip = NULL; dws->dma_mapped = 0; queue_work(dws->workqueue, &dws->pump_messages); spin_unlock_irqrestore(&dws->lock, flags); last_transfer = list_entry(msg->transfers.prev, struct spi_transfer, transfer_list); if (!last_transfer->cs_change && dws->cs_control) dws->cs_control(MRST_SPI_DEASSERT); msg->state = NULL; if (msg->complete) msg->complete(msg->context); } static void int_error_stop(struct dw_spi *dws, const char *msg) { /* Stop and reset hw */ flush(dws); spi_enable_chip(dws, 0); dev_err(&dws->master->dev, "%s\n", msg); dws->cur_msg->state = ERROR_STATE; tasklet_schedule(&dws->pump_transfers); } static void transfer_complete(struct dw_spi *dws) { /* Update total byte transfered return count actual bytes read */ dws->cur_msg->actual_length += dws->len; /* Move to next transfer */ dws->cur_msg->state = next_transfer(dws); /* Handle end of message */ if (dws->cur_msg->state == DONE_STATE) { dws->cur_msg->status = 0; giveback(dws); } else tasklet_schedule(&dws->pump_transfers); } static irqreturn_t interrupt_transfer(struct dw_spi *dws) { u16 irq_status, irq_mask = 0x3f; u32 int_level = dws->fifo_len / 2; u32 left; irq_status = dw_readw(dws, isr) & irq_mask; /* Error handling */ if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) { dw_readw(dws, txoicr); dw_readw(dws, rxoicr); dw_readw(dws, rxuicr); int_error_stop(dws, "interrupt_transfer: fifo overrun"); return IRQ_HANDLED; } if (irq_status & SPI_INT_TXEI) { spi_mask_intr(dws, SPI_INT_TXEI); left = (dws->tx_end - dws->tx) / dws->n_bytes; left = (left > int_level) ? int_level : left; while (left--) dws->write(dws); dws->read(dws); /* Re-enable the IRQ if there is still data left to tx */ if (dws->tx_end > dws->tx) spi_umask_intr(dws, SPI_INT_TXEI); else transfer_complete(dws); } return IRQ_HANDLED; } static irqreturn_t dw_spi_irq(int irq, void *dev_id) { struct dw_spi *dws = dev_id; u16 irq_status, irq_mask = 0x3f; irq_status = dw_readw(dws, isr) & irq_mask; if (!irq_status) return IRQ_NONE; if (!dws->cur_msg) { spi_mask_intr(dws, SPI_INT_TXEI); /* Never fail */ return IRQ_HANDLED; } return dws->transfer_handler(dws); } /* Must be called inside pump_transfers() */ static void poll_transfer(struct dw_spi *dws) { while (dws->write(dws)) dws->read(dws); transfer_complete(dws); } static void dma_transfer(struct dw_spi *dws, int cs_change) { } static void pump_transfers(unsigned long data) { struct dw_spi *dws = (struct dw_spi *)data; struct spi_message *message = NULL; struct spi_transfer *transfer = NULL; struct spi_transfer *previous = NULL; struct spi_device *spi = NULL; struct chip_data *chip = NULL; u8 bits = 0; u8 imask = 0; u8 cs_change = 0; u16 txint_level = 0; u16 clk_div = 0; u32 speed = 0; u32 cr0 = 0; /* Get current state information */ message = dws->cur_msg; transfer = dws->cur_transfer; chip = dws->cur_chip; spi = message->spi; if (unlikely(!chip->clk_div)) chip->clk_div = dws->max_freq / chip->speed_hz; if (message->state == ERROR_STATE) { message->status = -EIO; goto early_exit; } /* Handle end of message */ if (message->state == DONE_STATE) { message->status = 0; goto early_exit; } /* Delay if requested at end of transfer*/ if (message->state == RUNNING_STATE) { previous = list_entry(transfer->transfer_list.prev, struct spi_transfer, transfer_list); if (previous->delay_usecs) udelay(previous->delay_usecs); } dws->n_bytes = chip->n_bytes; dws->dma_width = chip->dma_width; dws->cs_control = chip->cs_control; dws->rx_dma = transfer->rx_dma; dws->tx_dma = transfer->tx_dma; dws->tx = (void *)transfer->tx_buf; dws->tx_end = dws->tx + transfer->len; dws->rx = transfer->rx_buf; dws->rx_end = dws->rx + transfer->len; dws->write = dws->tx ? chip->write : null_writer; dws->read = dws->rx ? chip->read : null_reader; dws->cs_change = transfer->cs_change; dws->len = dws->cur_transfer->len; if (chip != dws->prev_chip) cs_change = 1; cr0 = chip->cr0; /* Handle per transfer options for bpw and speed */ if (transfer->speed_hz) { speed = chip->speed_hz; if (transfer->speed_hz != speed) { speed = transfer->speed_hz; if (speed > dws->max_freq) { printk(KERN_ERR "MRST SPI0: unsupported" "freq: %dHz\n", speed); message->status = -EIO; goto early_exit; } /* clk_div doesn't support odd number */ clk_div = dws->max_freq / speed; clk_div = (clk_div + 1) & 0xfffe; chip->speed_hz = speed; chip->clk_div = clk_div; } } if (transfer->bits_per_word) { bits = transfer->bits_per_word; switch (bits) { case 8: dws->n_bytes = 1; dws->dma_width = 1; dws->read = (dws->read != null_reader) ? u8_reader : null_reader; dws->write = (dws->write != null_writer) ? u8_writer : null_writer; break; case 16: dws->n_bytes = 2; dws->dma_width = 2; dws->read = (dws->read != null_reader) ? u16_reader : null_reader; dws->write = (dws->write != null_writer) ? u16_writer : null_writer; break; default: printk(KERN_ERR "MRST SPI0: unsupported bits:" "%db\n", bits); message->status = -EIO; goto early_exit; } cr0 = (bits - 1) | (chip->type << SPI_FRF_OFFSET) | (spi->mode << SPI_MODE_OFFSET) | (chip->tmode << SPI_TMOD_OFFSET); } message->state = RUNNING_STATE; /* * Adjust transfer mode if necessary. Requires platform dependent * chipselect mechanism. */ if (dws->cs_control) { if (dws->rx && dws->tx) chip->tmode = SPI_TMOD_TR; else if (dws->rx) chip->tmode = SPI_TMOD_RO; else chip->tmode = SPI_TMOD_TO; cr0 &= ~SPI_TMOD_MASK; cr0 |= (chip->tmode << SPI_TMOD_OFFSET); } /* Check if current transfer is a DMA transaction */ dws->dma_mapped = map_dma_buffers(dws); /* * Interrupt mode * we only need set the TXEI IRQ, as TX/RX always happen syncronizely */ if (!dws->dma_mapped && !chip->poll_mode) { int templen = dws->len / dws->n_bytes; txint_level = dws->fifo_len / 2; txint_level = (templen > txint_level) ? txint_level : templen; imask |= SPI_INT_TXEI; dws->transfer_handler = interrupt_transfer; } /* * Reprogram registers only if * 1. chip select changes * 2. clk_div is changed * 3. control value changes */ if (dw_readw(dws, ctrl0) != cr0 || cs_change || clk_div || imask) { spi_enable_chip(dws, 0); if (dw_readw(dws, ctrl0) != cr0) dw_writew(dws, ctrl0, cr0); spi_set_clk(dws, clk_div ? clk_div : chip->clk_div); spi_chip_sel(dws, spi->chip_select); /* Set the interrupt mask, for poll mode just diable all int */ spi_mask_intr(dws, 0xff); if (imask) spi_umask_intr(dws, imask); if (txint_level) dw_writew(dws, txfltr, txint_level); spi_enable_chip(dws, 1); if (cs_change) dws->prev_chip = chip; } if (dws->dma_mapped) dma_transfer(dws, cs_change); if (chip->poll_mode) poll_transfer(dws); return; early_exit: giveback(dws); return; } static void pump_messages(struct work_struct *work) { struct dw_spi *dws = container_of(work, struct dw_spi, pump_messages); unsigned long flags; /* Lock queue and check for queue work */ spin_lock_irqsave(&dws->lock, flags); if (list_empty(&dws->queue) || dws->run == QUEUE_STOPPED) { dws->busy = 0; spin_unlock_irqrestore(&dws->lock, flags); return; } /* Make sure we are not already running a message */ if (dws->cur_msg) { spin_unlock_irqrestore(&dws->lock, flags); return; } /* Extract head of queue */ dws->cur_msg = list_entry(dws->queue.next, struct spi_message, queue); list_del_init(&dws->cur_msg->queue); /* Initial message state*/ dws->cur_msg->state = START_STATE; dws->cur_transfer = list_entry(dws->cur_msg->transfers.next, struct spi_transfer, transfer_list); dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi); /* Mark as busy and launch transfers */ tasklet_schedule(&dws->pump_transfers); dws->busy = 1; spin_unlock_irqrestore(&dws->lock, flags); } /* spi_device use this to queue in their spi_msg */ static int dw_spi_transfer(struct spi_device *spi, struct spi_message *msg) { struct dw_spi *dws = spi_master_get_devdata(spi->master); unsigned long flags; spin_lock_irqsave(&dws->lock, flags); if (dws->run == QUEUE_STOPPED) { spin_unlock_irqrestore(&dws->lock, flags); return -ESHUTDOWN; } msg->actual_length = 0; msg->status = -EINPROGRESS; msg->state = START_STATE; list_add_tail(&msg->queue, &dws->queue); if (dws->run == QUEUE_RUNNING && !dws->busy) { if (dws->cur_transfer || dws->cur_msg) queue_work(dws->workqueue, &dws->pump_messages); else { /* If no other data transaction in air, just go */ spin_unlock_irqrestore(&dws->lock, flags); pump_messages(&dws->pump_messages); return 0; } } spin_unlock_irqrestore(&dws->lock, flags); return 0; } /* This may be called twice for each spi dev */ static int dw_spi_setup(struct spi_device *spi) { struct dw_spi_chip *chip_info = NULL; struct chip_data *chip; if (spi->bits_per_word != 8 && spi->bits_per_word != 16) return -EINVAL; /* Only alloc on first setup */ chip = spi_get_ctldata(spi); if (!chip) { chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); if (!chip) return -ENOMEM; } /* * Protocol drivers may change the chip settings, so... * if chip_info exists, use it */ chip_info = spi->controller_data; /* chip_info doesn't always exist */ if (chip_info) { if (chip_info->cs_control) chip->cs_control = chip_info->cs_control; chip->poll_mode = chip_info->poll_mode; chip->type = chip_info->type; chip->rx_threshold = 0; chip->tx_threshold = 0; chip->enable_dma = chip_info->enable_dma; } if (spi->bits_per_word <= 8) { chip->n_bytes = 1; chip->dma_width = 1; chip->read = u8_reader; chip->write = u8_writer; } else if (spi->bits_per_word <= 16) { chip->n_bytes = 2; chip->dma_width = 2; chip->read = u16_reader; chip->write = u16_writer; } else { /* Never take >16b case for MRST SPIC */ dev_err(&spi->dev, "invalid wordsize\n"); return -EINVAL; } chip->bits_per_word = spi->bits_per_word; if (!spi->max_speed_hz) { dev_err(&spi->dev, "No max speed HZ parameter\n"); return -EINVAL; } chip->speed_hz = spi->max_speed_hz; chip->tmode = 0; /* Tx & Rx */ /* Default SPI mode is SCPOL = 0, SCPH = 0 */ chip->cr0 = (chip->bits_per_word - 1) | (chip->type << SPI_FRF_OFFSET) | (spi->mode << SPI_MODE_OFFSET) | (chip->tmode << SPI_TMOD_OFFSET); spi_set_ctldata(spi, chip); return 0; } static void dw_spi_cleanup(struct spi_device *spi) { struct chip_data *chip = spi_get_ctldata(spi); kfree(chip); } static int __devinit init_queue(struct dw_spi *dws) { INIT_LIST_HEAD(&dws->queue); spin_lock_init(&dws->lock); dws->run = QUEUE_STOPPED; dws->busy = 0; tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws); INIT_WORK(&dws->pump_messages, pump_messages); dws->workqueue = create_singlethread_workqueue( dev_name(dws->master->dev.parent)); if (dws->workqueue == NULL) return -EBUSY; return 0; } static int start_queue(struct dw_spi *dws) { unsigned long flags; spin_lock_irqsave(&dws->lock, flags); if (dws->run == QUEUE_RUNNING || dws->busy) { spin_unlock_irqrestore(&dws->lock, flags); return -EBUSY; } dws->run = QUEUE_RUNNING; dws->cur_msg = NULL; dws->cur_transfer = NULL; dws->cur_chip = NULL; dws->prev_chip = NULL; spin_unlock_irqrestore(&dws->lock, flags); queue_work(dws->workqueue, &dws->pump_messages); return 0; } static int stop_queue(struct dw_spi *dws) { unsigned long flags; unsigned limit = 50; int status = 0; spin_lock_irqsave(&dws->lock, flags); dws->run = QUEUE_STOPPED; while (!list_empty(&dws->queue) && dws->busy && limit--) { spin_unlock_irqrestore(&dws->lock, flags); msleep(10); spin_lock_irqsave(&dws->lock, flags); } if (!list_empty(&dws->queue) || dws->busy) status = -EBUSY; spin_unlock_irqrestore(&dws->lock, flags); return status; } static int destroy_queue(struct dw_spi *dws) { int status; status = stop_queue(dws); if (status != 0) return status; destroy_workqueue(dws->workqueue); return 0; } /* Restart the controller, disable all interrupts, clean rx fifo */ static void spi_hw_init(struct dw_spi *dws) { spi_enable_chip(dws, 0); spi_mask_intr(dws, 0xff); spi_enable_chip(dws, 1); flush(dws); /* * Try to detect the FIFO depth if not set by interface driver, * the depth could be from 2 to 256 from HW spec */ if (!dws->fifo_len) { u32 fifo; for (fifo = 2; fifo <= 257; fifo++) { dw_writew(dws, txfltr, fifo); if (fifo != dw_readw(dws, txfltr)) break; } dws->fifo_len = (fifo == 257) ? 0 : fifo; dw_writew(dws, txfltr, 0); } } int __devinit dw_spi_add_host(struct dw_spi *dws) { struct spi_master *master; int ret; BUG_ON(dws == NULL); master = spi_alloc_master(dws->parent_dev, 0); if (!master) { ret = -ENOMEM; goto exit; } dws->master = master; dws->type = SSI_MOTO_SPI; dws->prev_chip = NULL; dws->dma_inited = 0; dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60); ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, "dw_spi", dws); if (ret < 0) { dev_err(&master->dev, "can not get IRQ\n"); goto err_free_master; } master->mode_bits = SPI_CPOL | SPI_CPHA; master->bus_num = dws->bus_num; master->num_chipselect = dws->num_cs; master->cleanup = dw_spi_cleanup; master->setup = dw_spi_setup; master->transfer = dw_spi_transfer; dws->dma_inited = 0; /* Basic HW init */ spi_hw_init(dws); /* Initial and start queue */ ret = init_queue(dws); if (ret) { dev_err(&master->dev, "problem initializing queue\n"); goto err_diable_hw; } ret = start_queue(dws); if (ret) { dev_err(&master->dev, "problem starting queue\n"); goto err_diable_hw; } spi_master_set_devdata(master, dws); ret = spi_register_master(master); if (ret) { dev_err(&master->dev, "problem registering spi master\n"); goto err_queue_alloc; } mrst_spi_debugfs_init(dws); return 0; err_queue_alloc: destroy_queue(dws); err_diable_hw: spi_enable_chip(dws, 0); free_irq(dws->irq, dws); err_free_master: spi_master_put(master); exit: return ret; } EXPORT_SYMBOL(dw_spi_add_host); void __devexit dw_spi_remove_host(struct dw_spi *dws) { int status = 0; if (!dws) return; mrst_spi_debugfs_remove(dws); /* Remove the queue */ status = destroy_queue(dws); if (status != 0) dev_err(&dws->master->dev, "dw_spi_remove: workqueue will not " "complete, message memory not freed\n"); spi_enable_chip(dws, 0); /* Disable clk */ spi_set_clk(dws, 0); free_irq(dws->irq, dws); /* Disconnect from the SPI framework */ spi_unregister_master(dws->master); } EXPORT_SYMBOL(dw_spi_remove_host); int dw_spi_suspend_host(struct dw_spi *dws) { int ret = 0; ret = stop_queue(dws); if (ret) return ret; spi_enable_chip(dws, 0); spi_set_clk(dws, 0); return ret; } EXPORT_SYMBOL(dw_spi_suspend_host); int dw_spi_resume_host(struct dw_spi *dws) { int ret; spi_hw_init(dws); ret = start_queue(dws); if (ret) dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret); return ret; } EXPORT_SYMBOL(dw_spi_resume_host); MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); MODULE_DESCRIPTION("Driver for DesignWare SPI controller core"); MODULE_LICENSE("GPL v2");