spi: reorganize drivers

Sort the SPI makefile and enforce the naming convention spi_*.c for
spi drivers.

This change also rolls the contents of atmel_spi.h into the .c file
since there is only one user of that particular include file.

v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be
      be the predominant pattern for subsystem prefixes.
    - Clean up filenames in Kconfig and header comment blocks

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

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 000000000000..54e499d5f92c
--- /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 = &reg_base->csmode[spi->chip_select];
+        __be32 __iomem *espi_mode = &reg_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(&reg_base->mask, SPIM_NE);
+
+        /* transmit word */
+        word = mspi->get_tx(mspi);
+        mpc8xxx_spi_write_reg(&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(&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(&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(
+                        &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(&reg_base->mode);
+        loop_mode &= ~SPMODE_LOOP;
+        if (spi->mode & SPI_LOOP)
+                loop_mode |= SPMODE_LOOP;
+        mpc8xxx_spi_write_reg(&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(&reg_base->event);
+                }
+
+                if (mspi->len >= 4) {
+                        rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
+                } else {
+                        tmp = mspi->len;
+                        rx_data = 0;
+                        while (tmp--) {
+                                rx_data_8 = in_8((u8 *)&reg_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(
+                                &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(&reg_base->event, events);
+
+        mspi->count -= 1;
+        if (mspi->count) {
+                u32 word = mspi->get_tx(mspi);
+
+                mpc8xxx_spi_write_reg(&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(&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(&reg_base->mode, 0);
+        mpc8xxx_spi_write_reg(&reg_base->mask, 0);
+        mpc8xxx_spi_write_reg(&reg_base->command, 0);
+        mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
+
+        /* Init eSPI CS mode register */
+        for (i = 0; i < pdata->max_chipselect; i++)
+                mpc8xxx_spi_write_reg(&reg_base->csmode[i], CSMODE_INIT_VAL);
+
+        /* Enable SPI interface */
+        regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
+
+        mpc8xxx_spi_write_reg(&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");