diff options
Diffstat (limited to 'drivers/spi/spi-fsl-espi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-espi.c | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c new file mode 100644 index 00000000000..54e499d5f92 --- /dev/null +++ b/drivers/spi/spi-fsl-espi.c @@ -0,0 +1,762 @@ +/* + * Freescale eSPI controller driver. + * + * Copyright 2010 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/spi/spi.h> +#include <linux/platform_device.h> +#include <linux/fsl_devices.h> +#include <linux/mm.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/of_spi.h> +#include <linux/interrupt.h> +#include <linux/err.h> +#include <sysdev/fsl_soc.h> + +#include "spi-fsl-lib.h" + +/* eSPI Controller registers */ +struct fsl_espi_reg { + __be32 mode; /* 0x000 - eSPI mode register */ + __be32 event; /* 0x004 - eSPI event register */ + __be32 mask; /* 0x008 - eSPI mask register */ + __be32 command; /* 0x00c - eSPI command register */ + __be32 transmit; /* 0x010 - eSPI transmit FIFO access register*/ + __be32 receive; /* 0x014 - eSPI receive FIFO access register*/ + u8 res[8]; /* 0x018 - 0x01c reserved */ + __be32 csmode[4]; /* 0x020 - 0x02c eSPI cs mode register */ +}; + +struct fsl_espi_transfer { + const void *tx_buf; + void *rx_buf; + unsigned len; + unsigned n_tx; + unsigned n_rx; + unsigned actual_length; + int status; +}; + +/* eSPI Controller mode register definitions */ +#define SPMODE_ENABLE (1 << 31) +#define SPMODE_LOOP (1 << 30) +#define SPMODE_TXTHR(x) ((x) << 8) +#define SPMODE_RXTHR(x) ((x) << 0) + +/* eSPI Controller CS mode register definitions */ +#define CSMODE_CI_INACTIVEHIGH (1 << 31) +#define CSMODE_CP_BEGIN_EDGECLK (1 << 30) +#define CSMODE_REV (1 << 29) +#define CSMODE_DIV16 (1 << 28) +#define CSMODE_PM(x) ((x) << 24) +#define CSMODE_POL_1 (1 << 20) +#define CSMODE_LEN(x) ((x) << 16) +#define CSMODE_BEF(x) ((x) << 12) +#define CSMODE_AFT(x) ((x) << 8) +#define CSMODE_CG(x) ((x) << 3) + +/* Default mode/csmode for eSPI controller */ +#define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3)) +#define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \ + | CSMODE_AFT(0) | CSMODE_CG(1)) + +/* SPIE register values */ +#define SPIE_NE 0x00000200 /* Not empty */ +#define SPIE_NF 0x00000100 /* Not full */ + +/* SPIM register values */ +#define SPIM_NE 0x00000200 /* Not empty */ +#define SPIM_NF 0x00000100 /* Not full */ +#define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F) +#define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F) + +/* SPCOM register values */ +#define SPCOM_CS(x) ((x) << 30) +#define SPCOM_TRANLEN(x) ((x) << 0) +#define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */ + +static void fsl_espi_change_mode(struct spi_device *spi) +{ + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi->controller_state; + struct fsl_espi_reg *reg_base = mspi->reg_base; + __be32 __iomem *mode = ®_base->csmode[spi->chip_select]; + __be32 __iomem *espi_mode = ®_base->mode; + u32 tmp; + unsigned long flags; + + /* Turn off IRQs locally to minimize time that SPI is disabled. */ + local_irq_save(flags); + + /* Turn off SPI unit prior changing mode */ + tmp = mpc8xxx_spi_read_reg(espi_mode); + mpc8xxx_spi_write_reg(espi_mode, tmp & ~SPMODE_ENABLE); + mpc8xxx_spi_write_reg(mode, cs->hw_mode); + mpc8xxx_spi_write_reg(espi_mode, tmp); + + local_irq_restore(flags); +} + +static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi) +{ + u32 data; + u16 data_h; + u16 data_l; + const u32 *tx = mpc8xxx_spi->tx; + + if (!tx) + return 0; + + data = *tx++ << mpc8xxx_spi->tx_shift; + data_l = data & 0xffff; + data_h = (data >> 16) & 0xffff; + swab16s(&data_l); + swab16s(&data_h); + data = data_h | data_l; + + mpc8xxx_spi->tx = tx; + return data; +} + +static int fsl_espi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + int bits_per_word = 0; + u8 pm; + u32 hz = 0; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + /* Make sure its a bit width we support [4..16] */ + if ((bits_per_word < 4) || (bits_per_word > 16)) + return -EINVAL; + + if (!hz) + hz = spi->max_speed_hz; + + cs->rx_shift = 0; + cs->tx_shift = 0; + cs->get_rx = mpc8xxx_spi_rx_buf_u32; + cs->get_tx = mpc8xxx_spi_tx_buf_u32; + if (bits_per_word <= 8) { + cs->rx_shift = 8 - bits_per_word; + } else if (bits_per_word <= 16) { + cs->rx_shift = 16 - bits_per_word; + if (spi->mode & SPI_LSB_FIRST) + cs->get_tx = fsl_espi_tx_buf_lsb; + } else { + return -EINVAL; + } + + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + bits_per_word = bits_per_word - 1; + + /* mask out bits we are going to set */ + cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF)); + + cs->hw_mode |= CSMODE_LEN(bits_per_word); + + if ((mpc8xxx_spi->spibrg / hz) > 64) { + cs->hw_mode |= CSMODE_DIV16; + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; + + WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + "Will use %d Hz instead.\n", dev_name(&spi->dev), + hz, mpc8xxx_spi->spibrg / 1024); + if (pm > 16) + pm = 16; + } else { + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; + } + if (pm) + pm--; + + cs->hw_mode |= CSMODE_PM(pm); + + fsl_espi_change_mode(spi); + return 0; +} + +static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, + unsigned int len) +{ + u32 word; + struct fsl_espi_reg *reg_base = mspi->reg_base; + + mspi->count = len; + + /* enable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); + + /* transmit word */ + word = mspi->get_tx(mspi); + mpc8xxx_spi_write_reg(®_base->transmit, word); + + return 0; +} + +static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base; + unsigned int len = t->len; + u8 bits_per_word; + int ret; + + bits_per_word = spi->bits_per_word; + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + mpc8xxx_spi->len = t->len; + len = roundup(len, 4) / 4; + + mpc8xxx_spi->tx = t->tx_buf; + mpc8xxx_spi->rx = t->rx_buf; + + INIT_COMPLETION(mpc8xxx_spi->done); + + /* Set SPCOM[CS] and SPCOM[TRANLEN] field */ + if ((t->len - 1) > SPCOM_TRANLEN_MAX) { + dev_err(mpc8xxx_spi->dev, "Transaction length (%d)" + " beyond the SPCOM[TRANLEN] field\n", t->len); + return -EINVAL; + } + mpc8xxx_spi_write_reg(®_base->command, + (SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1))); + + ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len); + if (ret) + return ret; + + wait_for_completion(&mpc8xxx_spi->done); + + /* disable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, 0); + + return mpc8xxx_spi->count; +} + +static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd) +{ + if (cmd) { + cmd[1] = (u8)(addr >> 16); + cmd[2] = (u8)(addr >> 8); + cmd[3] = (u8)(addr >> 0); + } +} + +static inline unsigned int fsl_espi_cmd2addr(u8 *cmd) +{ + if (cmd) + return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0; + + return 0; +} + +static void fsl_espi_do_trans(struct spi_message *m, + struct fsl_espi_transfer *tr) +{ + struct spi_device *spi = m->spi; + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct fsl_espi_transfer *espi_trans = tr; + struct spi_message message; + struct spi_transfer *t, *first, trans; + int status = 0; + + spi_message_init(&message); + memset(&trans, 0, sizeof(trans)); + + first = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + list_for_each_entry(t, &m->transfers, transfer_list) { + if ((first->bits_per_word != t->bits_per_word) || + (first->speed_hz != t->speed_hz)) { + espi_trans->status = -EINVAL; + dev_err(mspi->dev, "bits_per_word/speed_hz should be" + " same for the same SPI transfer\n"); + return; + } + + trans.speed_hz = t->speed_hz; + trans.bits_per_word = t->bits_per_word; + trans.delay_usecs = max(first->delay_usecs, t->delay_usecs); + } + + trans.len = espi_trans->len; + trans.tx_buf = espi_trans->tx_buf; + trans.rx_buf = espi_trans->rx_buf; + spi_message_add_tail(&trans, &message); + + list_for_each_entry(t, &message.transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { + status = -EINVAL; + + status = fsl_espi_setup_transfer(spi, t); + if (status < 0) + break; + } + + if (t->len) + status = fsl_espi_bufs(spi, t); + + if (status) { + status = -EMSGSIZE; + break; + } + + if (t->delay_usecs) + udelay(t->delay_usecs); + } + + espi_trans->status = status; + fsl_espi_setup_transfer(spi, NULL); +} + +static void fsl_espi_cmd_trans(struct spi_message *m, + struct fsl_espi_transfer *trans, u8 *rx_buff) +{ + struct spi_transfer *t; + u8 *local_buf; + int i = 0; + struct fsl_espi_transfer *espi_trans = trans; + + local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); + if (!local_buf) { + espi_trans->status = -ENOMEM; + return; + } + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->tx_buf) { + memcpy(local_buf + i, t->tx_buf, t->len); + i += t->len; + } + } + + espi_trans->tx_buf = local_buf; + espi_trans->rx_buf = local_buf + espi_trans->n_tx; + fsl_espi_do_trans(m, espi_trans); + + espi_trans->actual_length = espi_trans->len; + kfree(local_buf); +} + +static void fsl_espi_rw_trans(struct spi_message *m, + struct fsl_espi_transfer *trans, u8 *rx_buff) +{ + struct fsl_espi_transfer *espi_trans = trans; + unsigned int n_tx = espi_trans->n_tx; + unsigned int n_rx = espi_trans->n_rx; + struct spi_transfer *t; + u8 *local_buf; + u8 *rx_buf = rx_buff; + unsigned int trans_len; + unsigned int addr; + int i, pos, loop; + + local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL); + if (!local_buf) { + espi_trans->status = -ENOMEM; + return; + } + + for (pos = 0, loop = 0; pos < n_rx; pos += trans_len, loop++) { + trans_len = n_rx - pos; + if (trans_len > SPCOM_TRANLEN_MAX - n_tx) + trans_len = SPCOM_TRANLEN_MAX - n_tx; + + i = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->tx_buf) { + memcpy(local_buf + i, t->tx_buf, t->len); + i += t->len; + } + } + + if (pos > 0) { + addr = fsl_espi_cmd2addr(local_buf); + addr += pos; + fsl_espi_addr2cmd(addr, local_buf); + } + + espi_trans->n_tx = n_tx; + espi_trans->n_rx = trans_len; + espi_trans->len = trans_len + n_tx; + espi_trans->tx_buf = local_buf; + espi_trans->rx_buf = local_buf + n_tx; + fsl_espi_do_trans(m, espi_trans); + + memcpy(rx_buf + pos, espi_trans->rx_buf + n_tx, trans_len); + + if (loop > 0) + espi_trans->actual_length += espi_trans->len - n_tx; + else + espi_trans->actual_length += espi_trans->len; + } + + kfree(local_buf); +} + +static void fsl_espi_do_one_msg(struct spi_message *m) +{ + struct spi_transfer *t; + u8 *rx_buf = NULL; + unsigned int n_tx = 0; + unsigned int n_rx = 0; + struct fsl_espi_transfer espi_trans; + + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->tx_buf) + n_tx += t->len; + if (t->rx_buf) { + n_rx += t->len; + rx_buf = t->rx_buf; + } + } + + espi_trans.n_tx = n_tx; + espi_trans.n_rx = n_rx; + espi_trans.len = n_tx + n_rx; + espi_trans.actual_length = 0; + espi_trans.status = 0; + + if (!rx_buf) + fsl_espi_cmd_trans(m, &espi_trans, NULL); + else + fsl_espi_rw_trans(m, &espi_trans, rx_buf); + + m->actual_length = espi_trans.actual_length; + m->status = espi_trans.status; + m->complete(m->context); +} + +static int fsl_espi_setup(struct spi_device *spi) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_espi_reg *reg_base; + int retval; + u32 hw_mode; + u32 loop_mode; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + if (!spi->max_speed_hz) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + } + + mpc8xxx_spi = spi_master_get_devdata(spi->master); + reg_base = mpc8xxx_spi->reg_base; + + hw_mode = cs->hw_mode; /* Save original settings */ + cs->hw_mode = mpc8xxx_spi_read_reg( + ®_base->csmode[spi->chip_select]); + /* mask out bits we are going to set */ + cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH + | CSMODE_REV); + + if (spi->mode & SPI_CPHA) + cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK; + if (spi->mode & SPI_CPOL) + cs->hw_mode |= CSMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + cs->hw_mode |= CSMODE_REV; + + /* Handle the loop mode */ + loop_mode = mpc8xxx_spi_read_reg(®_base->mode); + loop_mode &= ~SPMODE_LOOP; + if (spi->mode & SPI_LOOP) + loop_mode |= SPMODE_LOOP; + mpc8xxx_spi_write_reg(®_base->mode, loop_mode); + + retval = fsl_espi_setup_transfer(spi, NULL); + if (retval < 0) { + cs->hw_mode = hw_mode; /* Restore settings */ + return retval; + } + return 0; +} + +void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + struct fsl_espi_reg *reg_base = mspi->reg_base; + + /* We need handle RX first */ + if (events & SPIE_NE) { + u32 rx_data, tmp; + u8 rx_data_8; + + /* Spin until RX is done */ + while (SPIE_RXCNT(events) < min(4, mspi->len)) { + cpu_relax(); + events = mpc8xxx_spi_read_reg(®_base->event); + } + + if (mspi->len >= 4) { + rx_data = mpc8xxx_spi_read_reg(®_base->receive); + } else { + tmp = mspi->len; + rx_data = 0; + while (tmp--) { + rx_data_8 = in_8((u8 *)®_base->receive); + rx_data |= (rx_data_8 << (tmp * 8)); + } + + rx_data <<= (4 - mspi->len) * 8; + } + + mspi->len -= 4; + + if (mspi->rx) + mspi->get_rx(rx_data, mspi); + } + + if (!(events & SPIE_NF)) { + int ret; + + /* spin until TX is done */ + ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg( + ®_base->event)) & SPIE_NF) == 0, 1000, 0); + if (!ret) { + dev_err(mspi->dev, "tired waiting for SPIE_NF\n"); + return; + } + } + + /* Clear the events */ + mpc8xxx_spi_write_reg(®_base->event, events); + + mspi->count -= 1; + if (mspi->count) { + u32 word = mspi->get_tx(mspi); + + mpc8xxx_spi_write_reg(®_base->transmit, word); + } else { + complete(&mspi->done); + } +} + +static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) +{ + struct mpc8xxx_spi *mspi = context_data; + struct fsl_espi_reg *reg_base = mspi->reg_base; + irqreturn_t ret = IRQ_NONE; + u32 events; + + /* Get interrupt events(tx/rx) */ + events = mpc8xxx_spi_read_reg(®_base->event); + if (events) + ret = IRQ_HANDLED; + + dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events); + + fsl_espi_cpu_irq(mspi, events); + + return ret; +} + +static void fsl_espi_remove(struct mpc8xxx_spi *mspi) +{ + iounmap(mspi->reg_base); +} + +static struct spi_master * __devinit fsl_espi_probe(struct device *dev, + struct resource *mem, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_espi_reg *reg_base; + u32 regval; + int i, ret = 0; + + master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); + if (!master) { + ret = -ENOMEM; + goto err; + } + + dev_set_drvdata(dev, master); + + ret = mpc8xxx_spi_probe(dev, mem, irq); + if (ret) + goto err_probe; + + master->setup = fsl_espi_setup; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->spi_do_one_msg = fsl_espi_do_one_msg; + mpc8xxx_spi->spi_remove = fsl_espi_remove; + + mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem)); + if (!mpc8xxx_spi->reg_base) { + ret = -ENOMEM; + goto err_probe; + } + + reg_base = mpc8xxx_spi->reg_base; + + /* Register for SPI Interrupt */ + ret = request_irq(mpc8xxx_spi->irq, fsl_espi_irq, + 0, "fsl_espi", mpc8xxx_spi); + if (ret) + goto free_irq; + + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { + mpc8xxx_spi->rx_shift = 16; + mpc8xxx_spi->tx_shift = 24; + } + + /* SPI controller initializations */ + mpc8xxx_spi_write_reg(®_base->mode, 0); + mpc8xxx_spi_write_reg(®_base->mask, 0); + mpc8xxx_spi_write_reg(®_base->command, 0); + mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); + + /* Init eSPI CS mode register */ + for (i = 0; i < pdata->max_chipselect; i++) + mpc8xxx_spi_write_reg(®_base->csmode[i], CSMODE_INIT_VAL); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + + mpc8xxx_spi_write_reg(®_base->mode, regval); + + ret = spi_register_master(master); + if (ret < 0) + goto unreg_master; + + dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq); + + return master; + +unreg_master: + free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); +free_irq: + iounmap(mpc8xxx_spi->reg_base); +err_probe: + spi_master_put(master); +err: + return ERR_PTR(ret); +} + +static int of_fsl_espi_get_chipselects(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct fsl_spi_platform_data *pdata = dev->platform_data; + const u32 *prop; + int len; + + prop = of_get_property(np, "fsl,espi-num-chipselects", &len); + if (!prop || len < sizeof(*prop)) { + dev_err(dev, "No 'fsl,espi-num-chipselects' property\n"); + return -EINVAL; + } + + pdata->max_chipselect = *prop; + pdata->cs_control = NULL; + + return 0; +} + +static int __devinit of_fsl_espi_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct spi_master *master; + struct resource mem; + struct resource irq; + int ret = -ENOMEM; + + ret = of_mpc8xxx_spi_probe(ofdev); + if (ret) + return ret; + + ret = of_fsl_espi_get_chipselects(dev); + if (ret) + goto err; + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + goto err; + + ret = of_irq_to_resource(np, 0, &irq); + if (!ret) { + ret = -EINVAL; + goto err; + } + + master = fsl_espi_probe(dev, &mem, irq.start); + if (IS_ERR(master)) { + ret = PTR_ERR(master); + goto err; + } + + return 0; + +err: + return ret; +} + +static int __devexit of_fsl_espi_remove(struct platform_device *dev) +{ + return mpc8xxx_spi_remove(&dev->dev); +} + +static const struct of_device_id of_fsl_espi_match[] = { + { .compatible = "fsl,mpc8536-espi" }, + {} +}; +MODULE_DEVICE_TABLE(of, of_fsl_espi_match); + +static struct platform_driver fsl_espi_driver = { + .driver = { + .name = "fsl_espi", + .owner = THIS_MODULE, + .of_match_table = of_fsl_espi_match, + }, + .probe = of_fsl_espi_probe, + .remove = __devexit_p(of_fsl_espi_remove), +}; + +static int __init fsl_espi_init(void) +{ + return platform_driver_register(&fsl_espi_driver); +} +module_init(fsl_espi_init); + +static void __exit fsl_espi_exit(void) +{ + platform_driver_unregister(&fsl_espi_driver); +} +module_exit(fsl_espi_exit); + +MODULE_AUTHOR("Mingkai Hu"); +MODULE_DESCRIPTION("Enhanced Freescale SPI Driver"); +MODULE_LICENSE("GPL"); |