spi_mpc8xxx: Add support for QE DMA mode and CPM1/CPM2 chips

This patch adds QE buffer descriptors mode support for the
spi_mpc8xxx driver, and as a side effect we now support CPM1
and CPM2 SPI controllers.

That means that today we support almost all MPC SPI controllers:

- MPC834x-style controllers (support PIO mode only);
- CPM1 and CPM2 controllers (support DMA mode only);
- QE SPI controllers in CPU mode (PIO mode with shift quirks);
- QE SPI controllers in buffer descriptors (DMA) mode;

The only controller we don't currently support is a newer eSPI
(with a dedicated chip selects and a bit different registers map).

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 500 insertions, 40 deletions

diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c
index 80374dfa9708..394b6581e17f 100644
--- a/drivers/spi/spi_mpc8xxx.c
+++ b/drivers/spi/spi_mpc8xxx.c
@@ -5,6 +5,10 @@
  *
  * Copyright (C) 2006 Polycom, Inc.
  *
+ * CPM SPI and QE buffer descriptors mode support:
+ * Copyright (c) 2009  MontaVista Software, Inc.
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
  * 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
@@ -27,6 +31,9 @@
 #include <linux/spi/spi_bitbang.h>
 #include <linux/platform_device.h>
 #include <linux/fsl_devices.h>
+#include <linux/dma-mapping.h>
+#include <linux/mm.h>
+#include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/gpio.h>
@@ -34,8 +41,19 @@
 #include <linux/of_spi.h>
 
 #include <sysdev/fsl_soc.h>
+#include <asm/cpm.h>
+#include <asm/qe.h>
 #include <asm/irq.h>
 
+/* CPM1 and CPM2 are mutually exclusive. */
+#ifdef CONFIG_CPM1
+#include <asm/cpm1.h>
+#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
+#else
+#include <asm/cpm2.h>
+#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
+#endif
+
 /* SPI Controller registers */
 struct mpc8xxx_spi_reg {
         u8 res1[0x20];
@@ -47,6 +65,28 @@ struct mpc8xxx_spi_reg {
         __be32 receive;
 };
 
+/* SPI Parameter RAM */
+struct spi_pram {
+        __be16  rbase;  /* Rx Buffer descriptor base address */
+        __be16  tbase;  /* Tx Buffer descriptor base address */
+        u8      rfcr;   /* Rx function code */
+        u8      tfcr;   /* Tx function code */
+        __be16  mrblr;  /* Max receive buffer length */
+        __be32  rstate; /* Internal */
+        __be32  rdp;    /* Internal */
+        __be16  rbptr;  /* Internal */
+        __be16  rbc;    /* Internal */
+        __be32  rxtmp;  /* Internal */
+        __be32  tstate; /* Internal */
+        __be32  tdp;    /* Internal */
+        __be16  tbptr;  /* Internal */
+        __be16  tbc;    /* Internal */
+        __be32  txtmp;  /* Internal */
+        __be32  res;    /* Tx temp. */
+        __be16  rpbase; /* Relocation pointer (CPM1 only) */
+        __be16  res1;   /* Reserved */
+};
+
 /* SPI Controller mode register definitions */
 #define SPMODE_LOOP             (1 << 30)
 #define SPMODE_CI_INACTIVEHIGH  (1 << 29)
@@ -75,14 +115,40 @@ struct mpc8xxx_spi_reg {
 #define SPIM_NE         0x00000200      /* Not empty */
 #define SPIM_NF         0x00000100      /* Not full */
 
+#define SPIE_TXB        0x00000200      /* Last char is written to tx fifo */
+#define SPIE_RXB        0x00000100      /* Last char is written to rx buf */
+
+/* SPCOM register values */
+#define SPCOM_STR       (1 << 23)       /* Start transmit */
+
+#define SPI_PRAM_SIZE   0x100
+#define SPI_MRBLR       ((unsigned int)PAGE_SIZE)
+
 /* SPI Controller driver's private data. */
 struct mpc8xxx_spi {
+        struct device *dev;
         struct mpc8xxx_spi_reg __iomem *base;
 
         /* rx & tx bufs from the spi_transfer */
         const void *tx;
         void *rx;
 
+        int subblock;
+        struct spi_pram __iomem *pram;
+        struct cpm_buf_desc __iomem *tx_bd;
+        struct cpm_buf_desc __iomem *rx_bd;
+
+        struct spi_transfer *xfer_in_progress;
+
+        /* dma addresses for CPM transfers */
+        dma_addr_t tx_dma;
+        dma_addr_t rx_dma;
+        bool map_tx_dma;
+        bool map_rx_dma;
+
+        dma_addr_t dma_dummy_tx;
+        dma_addr_t dma_dummy_rx;
+
         /* functions to deal with different sized buffers */
         void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
         u32(*get_tx) (struct mpc8xxx_spi *);
@@ -98,6 +164,10 @@ struct mpc8xxx_spi {
 
         unsigned int flags;
 #define SPI_QE_CPU_MODE         (1 << 0) /* QE CPU ("PIO") mode */
+#define SPI_CPM_MODE            (1 << 1) /* CPM/QE ("DMA") mode */
+#define SPI_CPM1                (1 << 2) /* SPI unit is in CPM1 block */
+#define SPI_CPM2                (1 << 3) /* SPI unit is in CPM2 block */
+#define SPI_QE                  (1 << 4) /* SPI unit is in QE block */
 
         struct workqueue_struct *workqueue;
         struct work_struct work;
@@ -108,6 +178,10 @@ struct mpc8xxx_spi {
         struct completion done;
 };
 
+static void *mpc8xxx_dummy_rx;
+static DEFINE_MUTEX(mpc8xxx_dummy_rx_lock);
+static int mpc8xxx_dummy_rx_refcnt;
+
 struct spi_mpc8xxx_cs {
         /* functions to deal with different sized buffers */
         void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
@@ -173,6 +247,22 @@ static void mpc8xxx_spi_change_mode(struct spi_device *spi)
         mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
         mpc8xxx_spi_write_reg(mode, cs->hw_mode);
 
+        /* When in CPM mode, we need to reinit tx and rx. */
+        if (mspi->flags & SPI_CPM_MODE) {
+                if (mspi->flags & SPI_QE) {
+                        qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
+                                     QE_CR_PROTOCOL_UNSPECIFIED, 0);
+                } else {
+                        cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
+                        if (mspi->flags & SPI_CPM1) {
+                                out_be16(&mspi->pram->rbptr,
+                                         in_be16(&mspi->pram->rbase));
+                                out_be16(&mspi->pram->tbptr,
+                                         in_be16(&mspi->pram->tbase));
+                        }
+                }
+        }
+
         local_irq_restore(flags);
 }
 
@@ -298,19 +388,133 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
         return 0;
 }
 
-static int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
+static void mpc8xxx_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
 {
-        struct mpc8xxx_spi *mpc8xxx_spi;
-        u32 word, len, bits_per_word;
+        struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
+        struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
+        unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
+        unsigned int xfer_ofs;
 
-        mpc8xxx_spi = spi_master_get_devdata(spi->master);
+        xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
+
+        out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
+        out_be16(&rx_bd->cbd_datlen, 0);
+        out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
+
+        out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
+        out_be16(&tx_bd->cbd_datlen, xfer_len);
+        out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
+                                 BD_SC_LAST);
+
+        /* start transfer */
+        mpc8xxx_spi_write_reg(&mspi->base->command, SPCOM_STR);
+}
+
+static int mpc8xxx_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
+                                struct spi_transfer *t, bool is_dma_mapped)
+{
+        struct device *dev = mspi->dev;
+
+        if (is_dma_mapped) {
+                mspi->map_tx_dma = 0;
+                mspi->map_rx_dma = 0;
+        } else {
+                mspi->map_tx_dma = 1;
+                mspi->map_rx_dma = 1;
+        }
+
+        if (!t->tx_buf) {
+                mspi->tx_dma = mspi->dma_dummy_tx;
+                mspi->map_tx_dma = 0;
+        }
+
+        if (!t->rx_buf) {
+                mspi->rx_dma = mspi->dma_dummy_rx;
+                mspi->map_rx_dma = 0;
+        }
+
+        if (mspi->map_tx_dma) {
+                void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
+
+                mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
+                                              DMA_TO_DEVICE);
+                if (dma_mapping_error(dev, mspi->tx_dma)) {
+                        dev_err(dev, "unable to map tx dma\n");
+                        return -ENOMEM;
+                }
+        } else {
+                mspi->tx_dma = t->tx_dma;
+        }
+
+        if (mspi->map_rx_dma) {
+                mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
+                                              DMA_FROM_DEVICE);
+                if (dma_mapping_error(dev, mspi->rx_dma)) {
+                        dev_err(dev, "unable to map rx dma\n");
+                        goto err_rx_dma;
+                }
+        } else {
+                mspi->rx_dma = t->rx_dma;
+        }
+
+        /* enable rx ints */
+        mpc8xxx_spi_write_reg(&mspi->base->mask, SPIE_RXB);
+
+        mspi->xfer_in_progress = t;
+        mspi->count = t->len;
+
+        /* start CPM transfers */
+        mpc8xxx_spi_cpm_bufs_start(mspi);
+
+        return 0;
+
+err_rx_dma:
+        if (mspi->map_tx_dma)
+                dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
+        return -ENOMEM;
+}
+
+static void mpc8xxx_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
+{
+        struct device *dev = mspi->dev;
+        struct spi_transfer *t = mspi->xfer_in_progress;
+
+        if (mspi->map_tx_dma)
+                dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
+        if (mspi->map_tx_dma)
+                dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
+        mspi->xfer_in_progress = NULL;
+}
+
+static int mpc8xxx_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
+                                struct spi_transfer *t, unsigned int len)
+{
+        u32 word;
+
+        mspi->count = len;
+
+        /* enable rx ints */
+        mpc8xxx_spi_write_reg(&mspi->base->mask, SPIM_NE);
+
+        /* transmit word */
+        word = mspi->get_tx(mspi);
+        mpc8xxx_spi_write_reg(&mspi->base->transmit, word);
+
+        return 0;
+}
+
+static int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
+                            bool is_dma_mapped)
+{
+        struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
+        unsigned int len = t->len;
+        u8 bits_per_word;
+        int ret;
 
-        mpc8xxx_spi->tx = t->tx_buf;
-        mpc8xxx_spi->rx = t->rx_buf;
         bits_per_word = spi->bits_per_word;
         if (t->bits_per_word)
                 bits_per_word = t->bits_per_word;
-        len = t->len;
+
         if (bits_per_word > 8) {
                 /* invalid length? */
                 if (len & 1)
@@ -323,22 +527,27 @@ static int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
                         return -EINVAL;
                 len /= 2;
         }
-        mpc8xxx_spi->count = len;
 
-        INIT_COMPLETION(mpc8xxx_spi->done);
+        mpc8xxx_spi->tx = t->tx_buf;
+        mpc8xxx_spi->rx = t->rx_buf;
 
-        /* enable rx ints */
-        mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, SPIM_NE);
+        INIT_COMPLETION(mpc8xxx_spi->done);
 
-        /* transmit word */
-        word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
-        mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->transmit, word);
+        if (mpc8xxx_spi->flags & SPI_CPM_MODE)
+                ret = mpc8xxx_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
+        else
+                ret = mpc8xxx_spi_cpu_bufs(mpc8xxx_spi, t, len);
+        if (ret)
+                return ret;
 
         wait_for_completion(&mpc8xxx_spi->done);
 
         /* disable rx ints */
         mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mask, 0);
 
+        if (mpc8xxx_spi->flags & SPI_CPM_MODE)
+                mpc8xxx_spi_cpm_bufs_complete(mpc8xxx_spi);
+
         return mpc8xxx_spi->count;
 }
 
@@ -369,7 +578,7 @@ static void mpc8xxx_spi_do_one_msg(struct spi_message *m)
                 }
                 cs_change = t->cs_change;
                 if (t->len)
-                        status = mpc8xxx_spi_bufs(spi, t);
+                        status = mpc8xxx_spi_bufs(spi, t, m->is_dma_mapped);
                 if (status) {
                         status = -EMSGSIZE;
                         break;
@@ -458,45 +667,80 @@ static int mpc8xxx_spi_setup(struct spi_device *spi)
         return 0;
 }
 
-static irqreturn_t mpc8xxx_spi_irq(s32 irq, void *context_data)
+static void mpc8xxx_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
 {
-        struct mpc8xxx_spi *mpc8xxx_spi = context_data;
-        u32 event;
-        irqreturn_t ret = IRQ_NONE;
+        u16 len;
 
-        /* Get interrupt events(tx/rx) */
-        event = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->event);
+        dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
+                in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
 
-        /* We need handle RX first */
-        if (event & SPIE_NE) {
-                u32 rx_data = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->receive);
+        len = in_be16(&mspi->rx_bd->cbd_datlen);
+        if (len > mspi->count) {
+                WARN_ON(1);
+                len = mspi->count;
+        }
 
-                if (mpc8xxx_spi->rx)
-                        mpc8xxx_spi->get_rx(rx_data, mpc8xxx_spi);
+        /* Clear the events */
+        mpc8xxx_spi_write_reg(&mspi->base->event, events);
 
-                ret = IRQ_HANDLED;
+        mspi->count -= len;
+        if (mspi->count)
+                mpc8xxx_spi_cpm_bufs_start(mspi);
+        else
+                complete(&mspi->done);
+}
+
+static void mpc8xxx_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
+{
+        /* We need handle RX first */
+        if (events & SPIE_NE) {
+                u32 rx_data = mpc8xxx_spi_read_reg(&mspi->base->receive);
+
+                if (mspi->rx)
+                        mspi->get_rx(rx_data, mspi);
         }
 
-        if ((event & SPIE_NF) == 0)
+        if ((events & SPIE_NF) == 0)
                 /* spin until TX is done */
-                while (((event =
-                         mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->event)) &
+                while (((events =
+                        mpc8xxx_spi_read_reg(&mspi->base->event)) &
                                                 SPIE_NF) == 0)
                         cpu_relax();
 
-        mpc8xxx_spi->count -= 1;
-        if (mpc8xxx_spi->count) {
-                u32 word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
-                mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->transmit, word);
+        /* Clear the events */
+        mpc8xxx_spi_write_reg(&mspi->base->event, events);
+
+        mspi->count -= 1;
+        if (mspi->count) {
+                u32 word = mspi->get_tx(mspi);
+
+                mpc8xxx_spi_write_reg(&mspi->base->transmit, word);
         } else {
-                complete(&mpc8xxx_spi->done);
+                complete(&mspi->done);
         }
+}
 
-        /* Clear the events */
-        mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->event, event);
+static irqreturn_t mpc8xxx_spi_irq(s32 irq, void *context_data)
+{
+        struct mpc8xxx_spi *mspi = context_data;
+        irqreturn_t ret = IRQ_NONE;
+        u32 events;
+
+        /* Get interrupt events(tx/rx) */
+        events = mpc8xxx_spi_read_reg(&mspi->base->event);
+        if (events)
+                ret = IRQ_HANDLED;
+
+        dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
+
+        if (mspi->flags & SPI_CPM_MODE)
+                mpc8xxx_spi_cpm_irq(mspi, events);
+        else
+                mpc8xxx_spi_cpu_irq(mspi, events);
 
         return ret;
 }
+
 static int mpc8xxx_spi_transfer(struct spi_device *spi,
                                 struct spi_message *m)
 {
@@ -520,10 +764,212 @@ static void mpc8xxx_spi_cleanup(struct spi_device *spi)
         kfree(spi->controller_state);
 }
 
+static void *mpc8xxx_spi_alloc_dummy_rx(void)
+{
+        mutex_lock(&mpc8xxx_dummy_rx_lock);
+
+        if (!mpc8xxx_dummy_rx)
+                mpc8xxx_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
+        if (mpc8xxx_dummy_rx)
+                mpc8xxx_dummy_rx_refcnt++;
+
+        mutex_unlock(&mpc8xxx_dummy_rx_lock);
+
+        return mpc8xxx_dummy_rx;
+}
+
+static void mpc8xxx_spi_free_dummy_rx(void)
+{
+        mutex_lock(&mpc8xxx_dummy_rx_lock);
+
+        switch (mpc8xxx_dummy_rx_refcnt) {
+        case 0:
+                WARN_ON(1);
+                break;
+        case 1:
+                kfree(mpc8xxx_dummy_rx);
+                mpc8xxx_dummy_rx = NULL;
+                /* fall through */
+        default:
+                mpc8xxx_dummy_rx_refcnt--;
+                break;
+        }
+
+        mutex_unlock(&mpc8xxx_dummy_rx_lock);
+}
+
+static unsigned long mpc8xxx_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
+{
+        struct device *dev = mspi->dev;
+        struct device_node *np = dev_archdata_get_node(&dev->archdata);
+        const u32 *iprop;
+        int size;
+        unsigned long spi_base_ofs;
+        unsigned long pram_ofs = -ENOMEM;
+
+        /* Can't use of_address_to_resource(), QE muram isn't at 0. */
+        iprop = of_get_property(np, "reg", &size);
+
+        /* QE with a fixed pram location? */
+        if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
+                return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
+
+        /* QE but with a dynamic pram location? */
+        if (mspi->flags & SPI_QE) {
+                pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
+                qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
+                                QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
+                return pram_ofs;
+        }
+
+        /* CPM1 and CPM2 pram must be at a fixed addr. */
+        if (!iprop || size != sizeof(*iprop) * 4)
+                return -ENOMEM;
+
+        spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2);
+        if (IS_ERR_VALUE(spi_base_ofs))
+                return -ENOMEM;
+
+        if (mspi->flags & SPI_CPM2) {
+                pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
+                if (!IS_ERR_VALUE(pram_ofs)) {
+                        u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs);
+
+                        out_be16(spi_base, pram_ofs);
+                }
+        } else {
+                struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs);
+                u16 rpbase = in_be16(&pram->rpbase);
+
+                /* Microcode relocation patch applied? */
+                if (rpbase)
+                        pram_ofs = rpbase;
+                else
+                        return spi_base_ofs;
+        }
+
+        cpm_muram_free(spi_base_ofs);
+        return pram_ofs;
+}
+
+static int mpc8xxx_spi_cpm_init(struct mpc8xxx_spi *mspi)
+{
+        struct device *dev = mspi->dev;
+        struct device_node *np = dev_archdata_get_node(&dev->archdata);
+        const u32 *iprop;
+        int size;
+        unsigned long pram_ofs;
+        unsigned long bds_ofs;
+
+        if (!(mspi->flags & SPI_CPM_MODE))
+                return 0;
+
+        if (!mpc8xxx_spi_alloc_dummy_rx())
+                return -ENOMEM;
+
+        if (mspi->flags & SPI_QE) {
+                iprop = of_get_property(np, "cell-index", &size);
+                if (iprop && size == sizeof(*iprop))
+                        mspi->subblock = *iprop;
+
+                switch (mspi->subblock) {
+                default:
+                        dev_warn(dev, "cell-index unspecified, assuming SPI1");
+                        /* fall through */
+                case 0:
+                        mspi->subblock = QE_CR_SUBBLOCK_SPI1;
+                        break;
+                case 1:
+                        mspi->subblock = QE_CR_SUBBLOCK_SPI2;
+                        break;
+                }
+        }
+
+        pram_ofs = mpc8xxx_spi_cpm_get_pram(mspi);
+        if (IS_ERR_VALUE(pram_ofs)) {
+                dev_err(dev, "can't allocate spi parameter ram\n");
+                goto err_pram;
+        }
+
+        bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
+                                  sizeof(*mspi->rx_bd), 8);
+        if (IS_ERR_VALUE(bds_ofs)) {
+                dev_err(dev, "can't allocate bds\n");
+                goto err_bds;
+        }
+
+        mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
+                                            DMA_TO_DEVICE);
+        if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
+                dev_err(dev, "unable to map dummy tx buffer\n");
+                goto err_dummy_tx;
+        }
+
+        mspi->dma_dummy_rx = dma_map_single(dev, mpc8xxx_dummy_rx, SPI_MRBLR,
+                                            DMA_FROM_DEVICE);
+        if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
+                dev_err(dev, "unable to map dummy rx buffer\n");
+                goto err_dummy_rx;
+        }
+
+        mspi->pram = cpm_muram_addr(pram_ofs);
+
+        mspi->tx_bd = cpm_muram_addr(bds_ofs);
+        mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
+
+        /* Initialize parameter ram. */
+        out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
+        out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
+        out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
+        out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
+        out_be16(&mspi->pram->mrblr, SPI_MRBLR);
+        out_be32(&mspi->pram->rstate, 0);
+        out_be32(&mspi->pram->rdp, 0);
+        out_be16(&mspi->pram->rbptr, 0);
+        out_be16(&mspi->pram->rbc, 0);
+        out_be32(&mspi->pram->rxtmp, 0);
+        out_be32(&mspi->pram->tstate, 0);
+        out_be32(&mspi->pram->tdp, 0);
+        out_be16(&mspi->pram->tbptr, 0);
+        out_be16(&mspi->pram->tbc, 0);
+        out_be32(&mspi->pram->txtmp, 0);
+
+        return 0;
+
+err_dummy_rx:
+        dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
+err_dummy_tx:
+        cpm_muram_free(bds_ofs);
+err_bds:
+        cpm_muram_free(pram_ofs);
+err_pram:
+        mpc8xxx_spi_free_dummy_rx();
+        return -ENOMEM;
+}
+
+static void mpc8xxx_spi_cpm_free(struct mpc8xxx_spi *mspi)
+{
+        struct device *dev = mspi->dev;
+
+        dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
+        dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
+        cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
+        cpm_muram_free(cpm_muram_offset(mspi->pram));
+        mpc8xxx_spi_free_dummy_rx();
+}
+
 static const char *mpc8xxx_spi_strmode(unsigned int flags)
 {
-        if (flags & SPI_QE_CPU_MODE)
+        if (flags & SPI_QE_CPU_MODE) {
                 return "QE CPU";
+        } else if (flags & SPI_CPM_MODE) {
+                if (flags & SPI_QE)
+                        return "QE";
+                else if (flags & SPI_CPM2)
+                        return "CPM2";
+                else
+                        return "CPM1";
+        }
         return "CPU";
 }
 
@@ -553,11 +999,16 @@ mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq)
         master->cleanup = mpc8xxx_spi_cleanup;
 
         mpc8xxx_spi = spi_master_get_devdata(master);
+        mpc8xxx_spi->dev = dev;
         mpc8xxx_spi->get_rx = mpc8xxx_spi_rx_buf_u8;
         mpc8xxx_spi->get_tx = mpc8xxx_spi_tx_buf_u8;
         mpc8xxx_spi->flags = pdata->flags;
         mpc8xxx_spi->spibrg = pdata->sysclk;
 
+        ret = mpc8xxx_spi_cpm_init(mpc8xxx_spi);
+        if (ret)
+                goto err_cpm_init;
+
         mpc8xxx_spi->rx_shift = 0;
         mpc8xxx_spi->tx_shift = 0;
         if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
@@ -570,7 +1021,7 @@ mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq)
         mpc8xxx_spi->base = ioremap(mem->start, mem->end - mem->start + 1);
         if (mpc8xxx_spi->base == NULL) {
                 ret = -ENOMEM;
-                goto put_master;
+                goto err_ioremap;
         }
 
         mpc8xxx_spi->irq = irq;
@@ -624,7 +1075,9 @@ free_irq:
         free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
 unmap_io:
         iounmap(mpc8xxx_spi->base);
-put_master:
+err_ioremap:
+        mpc8xxx_spi_cpm_free(mpc8xxx_spi);
+err_cpm_init:
         spi_master_put(master);
 err:
         return ERR_PTR(ret);
@@ -644,6 +1097,7 @@ static int __devexit mpc8xxx_spi_remove(struct device *dev)
 
         free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
         iounmap(mpc8xxx_spi->base);
+        mpc8xxx_spi_cpm_free(mpc8xxx_spi);
 
         return 0;
 }
@@ -806,6 +1260,12 @@ static int __devinit of_mpc8xxx_spi_probe(struct of_device *ofdev,
         prop = of_get_property(np, "mode", NULL);
         if (prop && !strcmp(prop, "cpu-qe"))
                 pdata->flags = SPI_QE_CPU_MODE;
+        else if (prop && !strcmp(prop, "qe"))
+                pdata->flags = SPI_CPM_MODE | SPI_QE;
+        else if (of_device_is_compatible(np, "fsl,cpm2-spi"))
+                pdata->flags = SPI_CPM_MODE | SPI_CPM2;
+        else if (of_device_is_compatible(np, "fsl,cpm1-spi"))
+                pdata->flags = SPI_CPM_MODE | SPI_CPM1;
 
         ret = of_mpc8xxx_spi_get_chipselects(dev);
         if (ret)