diff options
Diffstat (limited to 'drivers/spi/spi_mpc8xxx.c')
| -rw-r--r-- | drivers/spi/spi_mpc8xxx.c | 622 |
1 files changed, 539 insertions, 83 deletions
diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c index 0fd0ec4d3a7d..1fb2a6ea328c 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 *); @@ -96,7 +162,7 @@ struct mpc8xxx_spi { u32 rx_shift; /* RX data reg shift when in qe mode */ u32 tx_shift; /* TX data reg shift when in qe mode */ - bool qe_mode; + unsigned int flags; struct workqueue_struct *workqueue; struct work_struct work; @@ -107,6 +173,10 @@ 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 *); @@ -155,6 +225,42 @@ MPC83XX_SPI_TX_BUF(u8) MPC83XX_SPI_TX_BUF(u16) MPC83XX_SPI_TX_BUF(u32) +static void mpc8xxx_spi_change_mode(struct spi_device *spi) +{ + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi->controller_state; + __be32 __iomem *mode = &mspi->base->mode; + unsigned long flags; + + if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) + return; + + /* Turn off IRQs locally to minimize time that SPI is disabled. */ + local_irq_save(flags); + + /* Turn off SPI unit prior changing mode */ + 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); +} + static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value) { struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); @@ -168,27 +274,13 @@ static void mpc8xxx_spi_chipselect(struct spi_device *spi, int value) } if (value == BITBANG_CS_ACTIVE) { - u32 regval = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode); - 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; - if (cs->hw_mode != regval) { - unsigned long flags; - __be32 __iomem *mode = &mpc8xxx_spi->base->mode; - - regval = cs->hw_mode; - /* Turn off IRQs locally to minimize time that - * SPI is disabled - */ - local_irq_save(flags); - /* Turn off SPI unit prior changing mode */ - mpc8xxx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); - mpc8xxx_spi_write_reg(mode, regval); - local_irq_restore(flags); - } + mpc8xxx_spi_change_mode(spi); + if (pdata->cs_control) pdata->cs_control(spi, pol); } @@ -198,7 +290,6 @@ static int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { struct mpc8xxx_spi *mpc8xxx_spi; - u32 regval; u8 bits_per_word, pm; u32 hz; struct spi_mpc8xxx_cs *cs = spi->controller_state; @@ -230,14 +321,14 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) if (bits_per_word <= 8) { cs->get_rx = mpc8xxx_spi_rx_buf_u8; cs->get_tx = mpc8xxx_spi_tx_buf_u8; - if (mpc8xxx_spi->qe_mode) { + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { cs->rx_shift = 16; cs->tx_shift = 24; } } else if (bits_per_word <= 16) { cs->get_rx = mpc8xxx_spi_rx_buf_u16; cs->get_tx = mpc8xxx_spi_tx_buf_u16; - if (mpc8xxx_spi->qe_mode) { + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { cs->rx_shift = 16; cs->tx_shift = 16; } @@ -247,7 +338,8 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) } else return -EINVAL; - if (mpc8xxx_spi->qe_mode && spi->mode & SPI_LSB_FIRST) { + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE && + spi->mode & SPI_LSB_FIRST) { cs->tx_shift = 0; if (bits_per_word <= 8) cs->rx_shift = 8; @@ -286,37 +378,138 @@ int mpc8xxx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) pm--; cs->hw_mode |= SPMODE_PM(pm); - regval = mpc8xxx_spi_read_reg(&mpc8xxx_spi->base->mode); - if (cs->hw_mode != regval) { - unsigned long flags; - __be32 __iomem *mode = &mpc8xxx_spi->base->mode; - - regval = cs->hw_mode; - /* Turn off IRQs locally to minimize time - * that SPI is disabled - */ - local_irq_save(flags); - /* Turn off SPI unit prior changing mode */ - mpc8xxx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); - mpc8xxx_spi_write_reg(mode, regval); - local_irq_restore(flags); + + mpc8xxx_spi_change_mode(spi); + return 0; +} + +static void mpc8xxx_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) +{ + 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; + + 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 int mpc8xxx_spi_bufs(struct spi_device *spi, struct spi_transfer *t) +static void mpc8xxx_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) { - struct mpc8xxx_spi *mpc8xxx_spi; - u32 word, len, bits_per_word; + 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; +} - mpc8xxx_spi = spi_master_get_devdata(spi->master); +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) @@ -329,22 +522,27 @@ 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; } @@ -375,7 +573,7 @@ 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; @@ -464,45 +662,80 @@ 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) { @@ -526,6 +759,215 @@ 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) { + 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"; +} + static struct spi_master * __devinit mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) { @@ -552,24 +994,29 @@ 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->qe_mode = pdata->qe_mode; + 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->qe_mode) { + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) { mpc8xxx_spi->rx_shift = 16; mpc8xxx_spi->tx_shift = 24; } init_completion(&mpc8xxx_spi->done); - mpc8xxx_spi->base = ioremap(mem->start, mem->end - mem->start + 1); + mpc8xxx_spi->base = ioremap(mem->start, resource_size(mem)); if (mpc8xxx_spi->base == NULL) { ret = -ENOMEM; - goto put_master; + goto err_ioremap; } mpc8xxx_spi->irq = irq; @@ -592,7 +1039,7 @@ mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) /* Enable SPI interface */ regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; - if (pdata->qe_mode) + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) regval |= SPMODE_OP; mpc8xxx_spi_write_reg(&mpc8xxx_spi->base->mode, regval); @@ -612,9 +1059,8 @@ mpc8xxx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) if (ret < 0) goto unreg_master; - printk(KERN_INFO - "%s: MPC8xxx SPI Controller driver at 0x%p (irq = %d)\n", - dev_name(dev), mpc8xxx_spi->base, mpc8xxx_spi->irq); + dev_info(dev, "at 0x%p (irq = %d), %s mode\n", mpc8xxx_spi->base, + mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); return master; @@ -624,7 +1070,9 @@ 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 +1092,7 @@ 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; } @@ -709,6 +1158,7 @@ static int of_mpc8xxx_spi_get_chipselects(struct device *dev) gpio = of_get_gpio_flags(np, i, &flags); if (!gpio_is_valid(gpio)) { dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); + ret = gpio; goto err_loop; } @@ -804,7 +1254,13 @@ 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->qe_mode = 1; + 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) @@ -900,7 +1356,7 @@ static int __devexit plat_mpc8xxx_spi_remove(struct platform_device *pdev) MODULE_ALIAS("platform:mpc8xxx_spi"); static struct platform_driver mpc8xxx_spi_driver = { .probe = plat_mpc8xxx_spi_probe, - .remove = __exit_p(plat_mpc8xxx_spi_remove), + .remove = __devexit_p(plat_mpc8xxx_spi_remove), .driver = { .name = "mpc8xxx_spi", .owner = THIS_MODULE, |