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openwrt-mirror/target/linux/coldfire/patches/080-mcfv4e_dspi_update.patch

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From 771f4741de2cd8a103d96cd1e8281926448ff56d Mon Sep 17 00:00:00 2001
From: Kurt Mahan <kmahan@freescale.com>
Date: Tue, 15 Jul 2008 11:44:08 -0600
Subject: [PATCH] Fix DSPI driver.
Update to latest Matt Coldfire driver. Fix timing issues with
M547x/M548x END-OF-QUEUE notification.
LTIBName: mcfv4e-dspi-update
Signed-off-by: Kurt Mahan <kmahan@freescale.com>
---
arch/m68k/coldfire/m547x_8x-devices.c | 35 +-
drivers/spi/Kconfig | 6 +
drivers/spi/Makefile | 2 +-
drivers/spi/dspi_mcf.c | 1217 +++++++++++++++++++++++++++++++++
include/asm-m68k/mcfdspi.h | 48 ++
5 files changed, 1296 insertions(+), 12 deletions(-)
create mode 100644 drivers/spi/dspi_mcf.c
create mode 100644 include/asm-m68k/mcfdspi.h
--- a/arch/m68k/coldfire/m547x_8x-devices.c
+++ b/arch/m68k/coldfire/m547x_8x-devices.c
@@ -26,26 +26,40 @@
*/
/* number of supported SPI selects */
-#define SPI_NUM_CHIPSELECTS 4
+#define SPI_NUM_CHIPSELECTS 8
void coldfire_spi_cs_control(u8 cs, u8 command)
{
/* nothing special required */
}
+#if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
+static struct coldfire_spi_chip spidev_chip_info = {
+ .bits_per_word = 8,
+};
+#endif
+
static struct spi_board_info spi_board_info[] = {
- /* no board info */
+#if defined(CONFIG_SPI_SPIDEV) || defined(CONFIG_SPI_SPIDEV_MODULE)
+ {
+ .modalias = "spidev",
+ .max_speed_hz = 16000000, /* max clk (SCK) speed in HZ */
+ .bus_num = 1,
+ .chip_select = 0, /* CS0 */
+ .controller_data = &spidev_chip_info,
+ }
+#endif
};
static int spi_irq_list[] = {
- /* IRQ, ICR Offset, ICR Val, Mask */
- 64 + ISC_DSPI_OVRFW, 0, 0, 0,
- 64 + ISC_DSPI_RFOF, 0, 0, 0,
- 64 + ISC_DSPI_RFDF, 0, 0, 0,
- 64 + ISC_DSPI_TFUF, 0, 0, 0,
- 64 + ISC_DSPI_TCF, 0, 0, 0,
- 64 + ISC_DSPI_TFFF, 0, 0, 0,
- 64 + ISC_DSPI_EOQF, 0, 0, 0,
+ /* IRQ, ICR Offset, ICR Val,Mask */
+ 64 + ISC_DSPI_OVRFW, ISC_DSPI_OVRFW, 0x18, 0,
+ 64 + ISC_DSPI_RFOF, ISC_DSPI_RFOF, 0x18, 0,
+ 64 + ISC_DSPI_RFDF, ISC_DSPI_RFDF, 0x18, 0,
+ 64 + ISC_DSPI_TFUF, ISC_DSPI_TFUF, 0x18, 0,
+ 64 + ISC_DSPI_TCF, ISC_DSPI_TCF, 0x18, 0,
+ 64 + ISC_DSPI_TFFF, ISC_DSPI_TFFF, 0x18, 0,
+ 64 + ISC_DSPI_EOQF, ISC_DSPI_EOQF, 0x18, 0,
0,0,0,0,
};
@@ -120,7 +134,6 @@ static int __init m547x_8x_spi_init(void
/* register device */
retval = platform_device_register(&coldfire_spi);
if (retval < 0) {
- printk(KERN_ERR "SPI-m547x_8x: platform_device_register failed with code=%d\n", retval);
goto out;
}
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -130,6 +130,12 @@ config SPI_COLDFIRE
Tested with the 5282 processor, but should also work with other
Coldfire variants.
+config SPI_DSPI
+ tristate "Coldfire DSPI"
+ depends on SPI_MASTER && COLDFIRE
+ help
+ SPI driver for Coldfire DSPI driver only.
+
config SPI_COLDFIRE_DSPI_EDMA
boolean "Coldfire DSPI master driver uses eDMA"
depends on SPI_MASTER && COLDFIRE && SPI_COLDFIRE && EXPERIMENTAL && COLDFIRE_EDMA
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -19,7 +19,7 @@ obj-$(CONFIG_SPI_BITBANG) += spi_bitban
obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
# obj-$(CONFIG_SPI_COLDFIRE) += spi_coldfire.o spi-m5445x.o
-obj-$(CONFIG_SPI_COLDFIRE) += spi_coldfire.o
+obj-$(CONFIG_SPI_DSPI) += dspi_mcf.o
obj-$(CONFIG_SPI_GPIO) += spi_gpio.o
obj-$(CONFIG_SPI_IMX) += spi_imx.o
obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
--- /dev/null
+++ b/drivers/spi/dspi_mcf.c
@@ -0,0 +1,1217 @@
+/*
+ * dspi_mcf.c - DSPI controller for ColdFire processors
+ *
+ *
+ * Matt Waddel Matt.Waddel@freescale.com
+ * Copyright Freescale Semiconductor, Inc. 2008
+ *
+ * M547x/M548x changes by Kurt Mahan kmahan@freescale.com
+ * Copyright Freescale Semiconductor, Inc. 2008
+ *
+ * Based on spi_coldfire.c done by:
+ * Andrey Butok
+ * Yaroslav Vinogradov
+ * Copyright Freescale Semiconductor, Inc. 2006-2007
+ * Mike Lavender (mike@steroidmicros)
+ * (C) Copyright 2005, Intec Automation,
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ ***************************************************************************
+ * Changes:
+ * v0.002 M547x/M548x support.
+ * v0.001 Initial version. Coldfire DSPI master driver.
+ ****************************************************************************/
+
+/*
+ * Includes
+ */
+
+#include <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfqspi.h>
+#include <asm/coldfire.h>
+#include <linux/io.h>
+#include <asm/mcfdspi.h>
+#include <linux/dma-mapping.h>
+
+#undef DSPI_COLDFIRE_DEBUG
+
+#ifdef DSPI_COLDFIRE_DEBUG
+#define DBG(fmt, args...) \
+ printk(KERN_INFO "[%s] " fmt , __FUNCTION__, ## args)
+#else
+#define DBG(fmt, args...) do {} while (0)
+#endif
+
+#if defined(CONFIG_M54455)
+#include <asm/mcf5445x_dspi.h>
+#if defined(CONFIG_SPI_COLDFIRE_DSPI_EDMA)
+ #include <asm/mcf5445x_edma.h>
+#endif
+#endif
+
+#if defined(CONFIG_M547X_8X)
+#include <asm/virtconvert.h>
+#include <asm/m5485dspi.h>
+#endif
+
+#if defined(CONFIG_SPI_COLDFIRE_DSPI_EDMA)
+#include <asm/mcf_edma.h>
+#define SPI_DSPI_EDMA
+#define EDMA_BUFSIZE_KMALLOC (DSPI_FIFO_SIZE*4)
+#define DSPI_DMA_RX_TCD MCF_EDMA_CHAN_DSPI_RX
+#define DSPI_DMA_TX_TCD MCF_EDMA_CHAN_DSPI_TX
+#endif
+
+#define DSPI_BITS MCF_DSPI_DCTAR_FMSZ(0xF)
+#define DSPI_BITS_16 MCF_DSPI_DCTAR_FMSZ(0xF)
+#define DSPI_BITS_8 MCF_DSPI_DCTAR_FMSZ(0x7)
+#define DSPI_FIFO_SIZE 16
+
+#define DRIVER_NAME "Coldfire DSPI"
+
+/****************************************************************************/
+
+/*
+ * Local constants and macros
+ */
+
+#define START_STATE ((void *)0)
+#define RUNNING_STATE ((void *)1)
+#define DONE_STATE ((void *)2)
+#define ERROR_STATE ((void *)-1)
+
+#define QUEUE_RUNNING 0
+#define QUEUE_STOPPED 1
+
+/****************************************************************************/
+
+/*
+ * Local Data Structures
+ */
+
+struct DSPI_MCR {
+ unsigned master:1;
+ unsigned cont_scke:1;
+ unsigned dconf:2;
+ unsigned frz:1;
+ unsigned mtfe:1;
+ unsigned pcsse:1;
+ unsigned rooe:1;
+ unsigned pcsis:8;
+ unsigned reserved15:1;
+ unsigned mdis:1;
+ unsigned dis_tx:1;
+ unsigned dis_rxf:1;
+ unsigned clr_tx:1;
+ unsigned clr_rxf:1;
+ unsigned smpl_pt:2;
+ unsigned reserved71:7;
+ unsigned halt:1;
+};
+
+struct DSPI_CTAR {
+ unsigned dbr:1;
+ unsigned fmsz:4;
+ unsigned cpol:1;
+ unsigned cpha:1;
+ unsigned lsbfe:1;
+ unsigned pcssck:2;
+ unsigned pasc:2;
+ unsigned pdt:2;
+ unsigned pbr:2;
+ unsigned cssck:4;
+ unsigned asc:4;
+ unsigned dt:4;
+ unsigned br:4;
+};
+
+struct chip_data {
+ /* dspi data */
+ union {
+ u32 mcr_val;
+ struct DSPI_MCR mcr;
+ };
+ union {
+ u32 ctar_val;
+ struct DSPI_CTAR ctar;
+ };
+ u16 void_write_data;
+};
+
+
+struct driver_data {
+ /* Driver model hookup */
+ struct platform_device *pdev;
+
+ /* SPI framework hookup */
+ struct spi_master *master;
+
+ /* Driver message queue */
+ struct workqueue_struct *workqueue;
+ struct work_struct pump_messages;
+ spinlock_t lock; /* lock */
+ struct list_head queue;
+ int busy;
+ int run;
+
+ /* Message Transfer pump */
+ struct tasklet_struct pump_transfers;
+
+ /* Current message transfer state info */
+ struct spi_message *cur_msg;
+ struct spi_transfer *cur_transfer;
+ struct chip_data *cur_chip;
+ size_t len;
+ void *tx;
+ void *tx_end;
+ void *rx;
+ void *rx_end;
+ char flags;
+#define TRAN_STATE_RX_VOID 0x01
+#define TRAN_STATE_TX_VOID 0x02
+#define TRAN_STATE_WORD_ODD_NUM 0x04
+ u8 cs;
+ u16 void_write_data;
+ unsigned cs_change:1;
+
+ u32 trans_cnt;
+ u32 wce_cnt;
+ u32 abrt_cnt;
+ u32 *mcr; /* DSPI MCR register */
+ u32 *ctar; /* DSPI CTAR register */
+ u32 *dspi_dtfr; /* DSPI DTFR register */
+ u32 *dspi_drfr; /* DSPI DRFR register */
+ u32 *dspi_rser; /* DSPI RSER register */
+ u32 *dspi_sr; /* DSPI status register */
+
+#if defined(SPI_DSPI_EDMA)
+ void *edma_tx_buf;
+ void *edma_rx_buf;
+#endif
+
+#if defined(CONFIG_M532x) || defined(CONFIG_M537x)
+ u16 *par; /* Pin assignment register */
+#else
+ u8 *par; /* Pin assignment register */
+#endif
+ u8 *int_icr; /* Interrupt level and priority register */
+ u32 *int_mr; /* Interrupt mask register */
+ void (*cs_control)(u8 cs, u8 command);
+};
+
+#define DSPI_CS(cs) ((1<<(cs))<<16)
+
+/****************************************************************************/
+
+/*
+ * SPI local functions
+ */
+
+static void *next_transfer(struct driver_data *drv_data)
+{
+ struct spi_message *msg = drv_data->cur_msg;
+ struct spi_transfer *trans = drv_data->cur_transfer;
+
+ DBG("\n");
+ /* Move to next transfer */
+ if (trans->transfer_list.next != &msg->transfers) {
+ drv_data->cur_transfer = list_entry(trans->transfer_list.next,
+ struct spi_transfer,
+ transfer_list);
+
+ if (drv_data->cur_transfer->transfer_list.next
+ == &msg->transfers) /* last transfer */
+ drv_data->cur_transfer->cs_change = 1;
+
+ return RUNNING_STATE;
+ } else
+ return DONE_STATE;
+}
+
+
+static inline int is_word_transfer(struct driver_data *drv_data)
+{
+ return ((*(drv_data->ctar+drv_data->cs) & DSPI_BITS_16) ==
+ DSPI_BITS_8) ? 0 : 1;
+}
+
+static inline void set_8bit_transfer_mode(struct driver_data *drv_data)
+{
+ DBG("\n");
+ *(drv_data->ctar+drv_data->cs) =
+ (*(drv_data->ctar + drv_data->cs) & ~DSPI_BITS) | DSPI_BITS_8;
+}
+
+static inline void set_16bit_transfer_mode(struct driver_data *drv_data)
+{
+ DBG("\n");
+ *(drv_data->ctar+drv_data->cs) =
+ (*(drv_data->ctar + drv_data->cs) & ~DSPI_BITS) | DSPI_BITS_16;
+}
+
+static unsigned char hz_to_spi_baud(int pbr, int dbr, int speed_hz)
+{
+ int pbr_tbl[4] = {2, 3, 5, 7}; /* Valid baud rate pre-scaler values */
+ int brs[16] = { 2, 4, 6, 8,
+ 16, 32, 64, 128,
+ 256, 512, 1024, 2048,
+ 4096, 8192, 16384, 32768 };
+ int temp, index = 0;
+
+ if ((pbr < 0) || (pbr > 3) ||
+ (dbr < 0) || (dbr > 1))
+ return 15; /* table indexes out of range, go slow */
+
+ temp = ((((MCF_CLK / 2) / pbr_tbl[pbr]) * (1 + dbr)) / speed_hz);
+
+ while (temp >= brs[index])
+ if (index++ >= 15)
+ break;
+
+ DBG("baud rate scaler = 0x%x - %d\n", index, brs[index]);
+ return(index);
+}
+
+static int write(struct driver_data *drv_data)
+{
+ int tx_count = 0;
+ int tx_word = is_word_transfer(drv_data);
+ u16 d16;
+ u8 d8;
+ u32 dspi_pushr = 0;
+ int first = 1;
+#if defined(SPI_DSPI_EDMA)
+ u32 *edma_wr = (u32 *)(drv_data->edma_tx_buf);
+#endif
+
+ /* If we are in word mode, but only have a single byte to transfer
+ * then switch to byte mode temporarily. Will switch back at the
+ * end of the transfer. */
+ if (tx_word && ((drv_data->tx_end - drv_data->tx) == 1)) {
+ drv_data->flags |= TRAN_STATE_WORD_ODD_NUM;
+ set_8bit_transfer_mode(drv_data);
+ tx_word = 0;
+ }
+
+ while ((drv_data->tx < drv_data->tx_end) && (tx_count < DSPI_FIFO_SIZE)) {
+// DBG("while\n");
+ if (tx_word) {
+ if ((drv_data->tx_end - drv_data->tx) == 1)
+ break;
+
+ if (!(drv_data->flags & TRAN_STATE_TX_VOID))
+ d16 = *(u16 *)drv_data->tx;
+ else
+ d16 = drv_data->void_write_data;
+
+ dspi_pushr = MCF_DSPI_DTFR_TXDATA(d16) |
+ DSPI_CS(drv_data->cs) |
+ MCF_DSPI_DTFR_CTAS(drv_data->cs) |
+ MCF_DSPI_DTFR_CONT;
+
+ drv_data->tx += 2;
+ } else {
+ if (!(drv_data->flags & TRAN_STATE_TX_VOID))
+ d8 = *(u8 *)drv_data->tx;
+ else
+ d8 = *(u8 *)&drv_data->void_write_data;
+
+ dspi_pushr = MCF_DSPI_DTFR_TXDATA(d8) |
+ DSPI_CS(drv_data->cs) |
+ MCF_DSPI_DTFR_CTAS(drv_data->cs) |
+ MCF_DSPI_DTFR_CONT;
+
+ drv_data->tx++;
+ }
+
+ if (drv_data->tx == drv_data->tx_end
+ || tx_count == DSPI_FIFO_SIZE-1) {
+ /* last transfer in the queue */
+ dspi_pushr |= MCF_DSPI_DTFR_EOQ;
+ if ((drv_data->cs_change)
+ && (drv_data->tx == drv_data->tx_end))
+ dspi_pushr &= ~MCF_DSPI_DTFR_CONT;
+#ifdef CONFIG_M547X_8X
+ /* EOQ gets missed if we don't delay */
+ udelay(100);
+#endif
+ } else if (tx_word && ((drv_data->tx_end - drv_data->tx) == 1))
+ dspi_pushr |= MCF_DSPI_DTFR_EOQ;
+
+ if (first) {
+ first = 0;
+ dspi_pushr |= MCF_DSPI_DTFR_CTCNT; /* clear counter */
+ }
+#if defined(SPI_DSPI_EDMA)
+ *edma_wr = dspi_pushr;
+ edma_wr++;
+#else
+ *drv_data->dspi_dtfr = dspi_pushr;
+#endif
+ tx_count++;
+ }
+
+#if defined(SPI_DSPI_EDMA)
+ if (tx_count > 0) {
+
+ mcf_edma_set_tcd_params(DSPI_DMA_TX_TCD,
+ virt_to_phys(drv_data->edma_tx_buf),
+ (u32)drv_data->dspi_dtfr,
+ MCF_EDMA_TCD_ATTR_SSIZE_32BIT
+ | MCF_EDMA_TCD_ATTR_DSIZE_32BIT,
+ 4, /* soff */
+ 4 * tx_count, /* nbytes */
+ 0, /* slast */
+ 1, /* citer */
+ 1, /* biter */
+ 0, /* doff */
+ 0, /* dlastsga */
+ 0, /* major_int */
+ 1); /* disable_req */
+
+ mcf_edma_set_tcd_params(DSPI_DMA_RX_TCD,
+ (u32)drv_data->dspi_drfr,
+ virt_to_phys(drv_data->edma_rx_buf),
+ MCF_EDMA_TCD_ATTR_SSIZE_32BIT
+ | MCF_EDMA_TCD_ATTR_DSIZE_32BIT,
+ 0, /* soff */
+ 4 * tx_count, /* nbytes */
+ 0, /* slast */
+ 1, /* citer */
+ 1, /* biter */
+ 4, /* doff */
+ 0, /* dlastsga */
+ 0, /* major_int */
+ 1); /* disable_req */
+
+ mcf_edma_start_transfer(DSPI_DMA_TX_TCD);
+ }
+#endif
+ return (tx_count * (tx_word + 1));
+}
+
+static int read(struct driver_data *drv_data)
+{
+ int rx_count = 0;
+ int rx_word = is_word_transfer(drv_data);
+ u16 d;
+#if defined(SPI_DSPI_EDMA)
+ u32 *rx_edma = (u32 *) drv_data->edma_rx_buf;
+
+ /* receive SPI data */
+ mcf_edma_start_transfer(DSPI_DMA_RX_TCD);
+#endif
+ while ((drv_data->rx < drv_data->rx_end)
+ && (rx_count < DSPI_FIFO_SIZE)) {
+
+ if (rx_word) {
+ if ((drv_data->rx_end - drv_data->rx) == 1)
+ break;
+#if defined(SPI_DSPI_EDMA)
+ d = MCF_DSPI_DRFR_RXDATA(*rx_edma);
+ rx_edma++;
+#else
+ d = MCF_DSPI_DRFR_RXDATA(*drv_data->dspi_drfr);
+#endif
+ if (!(drv_data->flags & TRAN_STATE_RX_VOID))
+ *(u16 *)drv_data->rx = d;
+ drv_data->rx += 2;
+
+ } else {
+#if defined(SPI_DSPI_EDMA)
+ d = MCF_DSPI_DRFR_RXDATA(*rx_edma);
+ rx_edma++;
+#else
+ d = MCF_DSPI_DRFR_RXDATA(*drv_data->dspi_drfr);
+#endif
+ if (!(drv_data->flags & TRAN_STATE_RX_VOID))
+ *(u8 *)drv_data->rx = d;
+ drv_data->rx++;
+ }
+ rx_count++;
+ DBG("rxd=0x%x\n", d);
+ }
+ return rx_count;
+}
+
+
+static inline void dspi_setup_chip(struct driver_data *drv_data)
+{
+ struct chip_data *chip = drv_data->cur_chip;
+
+ DBG("\n");
+ *drv_data->mcr = chip->mcr_val;
+ *(drv_data->ctar+drv_data->cs) = chip->ctar_val;
+ *drv_data->dspi_rser = MCF_DSPI_DRSER_EOQFE;
+}
+
+#if defined(SPI_DSPI_EDMA)
+static int edma_tx_handler(int channel, void *dev)
+{
+ DBG("\n");
+ if (channel == DSPI_DMA_TX_TCD)
+ mcf_edma_stop_transfer(DSPI_DMA_TX_TCD);
+ return IRQ_HANDLED;
+}
+
+static int edma_rx_handler(int channel, void *dev)
+{
+ DBG("\n");
+ if (channel == DSPI_DMA_RX_TCD)
+ mcf_edma_stop_transfer(DSPI_DMA_RX_TCD);
+ return IRQ_HANDLED;
+}
+#endif
+
+static irqreturn_t dspi_interrupt(int irq, void *dev_id)
+{
+ struct driver_data *drv_data = (struct driver_data *)dev_id;
+ struct spi_message *msg = drv_data->cur_msg;
+
+ /* Clear all flags immediately */
+ *drv_data->dspi_sr = MCF_DSPI_DSR_EOQF;
+
+ if (!drv_data->cur_msg || !drv_data->cur_msg->state) {
+#if !defined(SPI_DSPI_EDMA)
+ u32 irq_status = *drv_data->dspi_sr;
+ /* if eDMA is used it happens some time (at least once)*/
+ printk(KERN_ERR "Bad message or transfer state handler. \
+ IRQ status = %x\n", irq_status);
+#endif
+ return IRQ_NONE;
+ }
+
+ DBG("\n");
+ /*
+ * Read the data into the buffer and reload and start
+ * queue with new data if not finished. If finished
+ * then setup the next transfer
+ */
+ read(drv_data);
+
+ if (drv_data->rx == drv_data->rx_end) {
+ /*
+ * Finished now - fall through and schedule next
+ * transfer tasklet
+ */
+ if (drv_data->flags & TRAN_STATE_WORD_ODD_NUM)
+ set_16bit_transfer_mode(drv_data);
+
+ msg->state = next_transfer(drv_data);
+ } else {
+ /* not finished yet - keep going */
+ msg->actual_length += write(drv_data);
+ return IRQ_HANDLED;
+ }
+
+ tasklet_schedule(&drv_data->pump_transfers);
+
+ return IRQ_HANDLED;
+}
+
+/* caller already set message->status; dma and pio irqs are blocked */
+static void giveback(struct driver_data *drv_data)
+{
+ struct spi_transfer *last_transfer;
+ unsigned long flags;
+ struct spi_message *msg;
+ DBG("\n");
+
+ spin_lock_irqsave(&drv_data->lock, flags);
+ msg = drv_data->cur_msg;
+ drv_data->cur_msg = NULL;
+ drv_data->cur_transfer = NULL;
+ drv_data->cur_chip = NULL;
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+
+ last_transfer = list_entry(msg->transfers.prev,
+ struct spi_transfer, transfer_list);
+
+ if (!last_transfer->cs_change)
+ drv_data->cs_control(drv_data->cs, QSPI_CS_DROP);
+
+ msg->state = NULL;
+ if (msg->complete)
+ msg->complete(msg->context);
+}
+
+
+static void pump_transfers(unsigned long data)
+{
+ struct driver_data *drv_data = (struct driver_data *)data;
+ struct spi_message *message = NULL;
+ struct spi_transfer *transfer = NULL;
+ struct spi_transfer *previous = NULL;
+ struct chip_data *chip = NULL;
+ unsigned long flags;
+ DBG("\n");
+ /* Get current state information */
+ message = drv_data->cur_msg;
+ transfer = drv_data->cur_transfer;
+ chip = drv_data->cur_chip;
+
+ /* Handle for abort */
+ if (message->state == ERROR_STATE) {
+ message->status = -EIO;
+ giveback(drv_data);
+ return;
+ }
+
+ /* Handle end of message */
+ if (message->state == DONE_STATE) {
+ message->status = 0;
+ giveback(drv_data);
+ return;
+ }
+
+ if (message->state == START_STATE) {
+ dspi_setup_chip(drv_data);
+
+ if (drv_data->cs_control)
+ drv_data->cs_control(message->spi->chip_select,
+ QSPI_CS_ASSERT);
+ }
+
+ /* Delay if requested at end of transfer*/
+ if (message->state == RUNNING_STATE) {
+ previous = list_entry(transfer->transfer_list.prev,
+ struct spi_transfer,
+ transfer_list);
+
+ if (drv_data->cs_control && transfer->cs_change)
+ drv_data->cs_control(message->spi->chip_select,
+ QSPI_CS_DROP);
+
+ if (previous->delay_usecs)
+ udelay(previous->delay_usecs);
+
+ if (drv_data->cs_control && transfer->cs_change)
+ drv_data->cs_control(message->spi->chip_select,
+ QSPI_CS_ASSERT);
+ }
+
+ drv_data->flags = 0;
+ drv_data->tx = (void *)transfer->tx_buf;
+ drv_data->tx_end = drv_data->tx + transfer->len;
+ drv_data->rx = transfer->rx_buf;
+ drv_data->rx_end = drv_data->rx + transfer->len;
+
+ if (!drv_data->rx)
+ drv_data->flags |= TRAN_STATE_RX_VOID;
+ if (!drv_data->tx)
+ drv_data->flags |= TRAN_STATE_TX_VOID;
+ drv_data->cs = message->spi->chip_select;
+ drv_data->cs_change = transfer->cs_change;
+ drv_data->void_write_data = chip->void_write_data;
+ if (transfer->speed_hz) {
+ *(drv_data->ctar + drv_data->cs) = \
+ ((chip->ctar_val & ~0xF) | \
+ hz_to_spi_baud(chip->ctar.pbr, \
+ chip->ctar.dbr, \
+ transfer->speed_hz));
+ }
+
+ message->state = RUNNING_STATE;
+ /* Go baby, go */
+ local_irq_save(flags);
+ message->actual_length += write(drv_data);
+ local_irq_restore(flags);
+}
+
+
+static void pump_messages(struct work_struct *work)
+{
+ struct driver_data *drv_data;
+ unsigned long flags;
+ DBG("\n");
+
+ drv_data = container_of(work, struct driver_data, pump_messages);
+
+ /* Lock queue and check for queue work */
+ spin_lock_irqsave(&drv_data->lock, flags);
+ if (list_empty(&drv_data->queue)
+ || drv_data->run == QUEUE_STOPPED) {
+ drv_data->busy = 0;
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+ return;
+ }
+
+ /* Make sure we are not already running a message */
+ if (drv_data->cur_msg) {
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+ return;
+ }
+
+ /* Extract head of queue */
+ drv_data->cur_msg = list_entry(drv_data->queue.next,
+ struct spi_message, queue);
+ list_del_init(&drv_data->cur_msg->queue);
+
+ /* Initial message state*/
+ drv_data->cur_msg->state = START_STATE;
+ drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
+ struct spi_transfer,
+ transfer_list);
+
+ if (drv_data->cur_transfer->transfer_list.next
+ == &drv_data->cur_msg->transfers)
+ drv_data->cur_transfer->cs_change = 1; /* last */
+
+
+ /* Setup the SPI Registers using the per chip configuration */
+ drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
+
+ /* Mark as busy and launch transfers */
+ tasklet_schedule(&drv_data->pump_transfers);
+
+ drv_data->busy = 1;
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+}
+
+/****************************************************************************/
+
+/*
+ * SPI master implementation
+ */
+
+static int transfer(struct spi_device *spi, struct spi_message *msg)
+{
+ struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+ unsigned long flags;
+
+ DBG("\n");
+ spin_lock_irqsave(&drv_data->lock, flags);
+
+ if (drv_data->run == QUEUE_STOPPED) {
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+ return -ESHUTDOWN;
+ }
+
+ msg->actual_length = 0;
+ msg->status = -EINPROGRESS;
+ msg->state = START_STATE;
+
+ list_add_tail(&msg->queue, &drv_data->queue);
+
+ if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
+
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+
+ return 0;
+}
+
+
+static int setup(struct spi_device *spi)
+{
+
+ struct chip_data *chip;
+ struct coldfire_dspi_chip *chip_info
+ = (struct coldfire_dspi_chip *)spi->controller_data;
+ DBG("\n");
+
+ /* Only alloc on first setup */
+ chip = spi_get_ctldata(spi);
+ if (chip == NULL) {
+ chip = kcalloc(1, sizeof(struct chip_data), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+ spi->mode = chip_info->mode;
+ spi->bits_per_word = chip_info->bits_per_word;
+ }
+
+ chip->mcr.master = 1;
+ chip->mcr.cont_scke = 0;
+ chip->mcr.dconf = 0;
+ chip->mcr.frz = 0;
+ chip->mcr.mtfe = 0;
+ chip->mcr.pcsse = 0;
+ chip->mcr.rooe = 0;
+ chip->mcr.pcsis = 0xFF;
+ chip->mcr.reserved15 = 0;
+ chip->mcr.mdis = 0;
+ chip->mcr.dis_tx = 0;
+ chip->mcr.dis_rxf = 0;
+ chip->mcr.clr_tx = 1;
+ chip->mcr.clr_rxf = 1;
+ chip->mcr.smpl_pt = 0;
+ chip->mcr.reserved71 = 0;
+ chip->mcr.halt = 0;
+
+ if ((spi->bits_per_word >= 4) && (spi->bits_per_word <= 16)) {
+ chip->ctar.fmsz = spi->bits_per_word-1;
+ } else {
+ printk(KERN_ERR "Invalid wordsize\n");
+ kfree(chip);
+ return -ENODEV;
+ }
+
+ chip->void_write_data = chip_info->void_write_data;
+
+ if (spi->max_speed_hz != 0)
+ chip_info->br = hz_to_spi_baud(chip_info->pbr, chip_info->dbr, \
+ spi->max_speed_hz);
+
+ chip->ctar.cpha = (spi->mode & SPI_CPHA) ? 1 : 0;
+ chip->ctar.cpol = (spi->mode & SPI_CPOL) ? 1 : 0;
+ chip->ctar.lsbfe = (spi->mode & SPI_LSB_FIRST) ? 1 : 0;
+ chip->ctar.dbr = chip_info->dbr;
+ chip->ctar.pbr = chip_info->pbr;
+ chip->ctar.br = chip_info->br;
+ chip->ctar.pcssck = chip_info->pcssck;
+ chip->ctar.pasc = chip_info->pasc;
+ chip->ctar.pdt = chip_info->pdt;
+ chip->ctar.cssck = chip_info->cssck;
+ chip->ctar.asc = chip_info->asc;
+ chip->ctar.dt = chip_info->dt;
+
+ spi_set_ctldata(spi, chip);
+
+ return 0;
+}
+
+static int init_queue(struct driver_data *drv_data)
+{
+ INIT_LIST_HEAD(&drv_data->queue);
+ spin_lock_init(&drv_data->lock);
+
+ drv_data->run = QUEUE_STOPPED;
+ drv_data->busy = 0;
+
+ tasklet_init(&drv_data->pump_transfers,
+ pump_transfers, (unsigned long)drv_data);
+
+ INIT_WORK(&drv_data->pump_messages, pump_messages);
+
+ drv_data->workqueue = create_singlethread_workqueue(
+ drv_data->master->dev.parent->bus_id);
+ if (drv_data->workqueue == NULL)
+ return -EBUSY;
+
+ return 0;
+}
+
+static int start_queue(struct driver_data *drv_data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&drv_data->lock, flags);
+
+ if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+ return -EBUSY;
+ }
+
+ drv_data->run = QUEUE_RUNNING;
+ drv_data->cur_msg = NULL;
+ drv_data->cur_transfer = NULL;
+ drv_data->cur_chip = NULL;
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
+
+ return 0;
+}
+
+static int stop_queue(struct driver_data *drv_data)
+{
+ unsigned long flags;
+ unsigned limit = 500;
+ int status = 0;
+
+ spin_lock_irqsave(&drv_data->lock, flags);
+
+ /* This is a bit lame, but is optimized for the common execution path.
+ * A wait_queue on the drv_data->busy could be used, but then the common
+ * execution path (pump_messages) would be required to call wake_up or
+ * friends on every SPI message. Do this instead */
+ drv_data->run = QUEUE_STOPPED;
+ while (!list_empty(&drv_data->queue) && drv_data->busy && limit--) {
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+ msleep(10);
+ spin_lock_irqsave(&drv_data->lock, flags);
+ }
+
+ if (!list_empty(&drv_data->queue) || drv_data->busy)
+ status = -EBUSY;
+
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+
+ return status;
+}
+
+static int destroy_queue(struct driver_data *drv_data)
+{
+ int status;
+
+ status = stop_queue(drv_data);
+ if (status != 0)
+ return status;
+
+ destroy_workqueue(drv_data->workqueue);
+
+ return 0;
+}
+
+
+static void cleanup(struct spi_device *spi)
+{
+ struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
+
+ dev_dbg(&spi->dev, "spi_device %u.%u cleanup\n",
+ spi->master->bus_num, spi->chip_select);
+
+ kfree(chip);
+}
+
+
+/****************************************************************************/
+
+/*
+ * Generic Device driver routines and interface implementation
+ */
+
+static int coldfire_spi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct coldfire_spi_master *platform_info;
+ struct spi_master *master;
+ struct driver_data *drv_data = 0;
+ struct resource *memory_resource;
+ int irq;
+ int status = 0;
+ int i;
+#if defined(SPI_DSPI_EDMA)
+ dma_addr_t dma_handle;
+#endif
+
+ platform_info = (struct coldfire_spi_master *)dev->platform_data;
+
+ master = spi_alloc_master(dev, sizeof(struct driver_data));
+ if (!master)
+ return -ENOMEM;
+
+ drv_data = spi_master_get_devdata(master);
+ drv_data->master = master;
+
+ INIT_LIST_HEAD(&drv_data->queue);
+ spin_lock_init(&drv_data->lock);
+
+ master->bus_num = platform_info->bus_num;
+ master->num_chipselect = platform_info->num_chipselect;
+ master->cleanup = cleanup;
+ master->setup = setup;
+ master->transfer = transfer;
+
+ drv_data->cs_control = platform_info->cs_control;
+ if (drv_data->cs_control)
+ for (i = 0; i < master->num_chipselect; i++)
+ drv_data->cs_control(i, QSPI_CS_INIT | QSPI_CS_DROP);
+
+ /* Setup register addresses */
+ memory_resource = platform_get_resource_byname(pdev,
+ IORESOURCE_MEM, "spi-module");
+ if (!memory_resource) {
+ dev_dbg(dev, "can not find platform module memory\n");
+ goto out_error_master_alloc;
+ }
+
+#if defined(SPI_DSPI_EDMA)
+ drv_data->edma_tx_buf = dma_alloc_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
+ &dma_handle, GFP_DMA);
+ if (!drv_data->edma_tx_buf) {
+ dev_dbg(dev, "cannot allocate eDMA TX memory\n");
+ goto out_error_master_alloc;
+ }
+ drv_data->edma_rx_buf = dma_alloc_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
+ &dma_handle, GFP_DMA);
+ if (!drv_data->edma_rx_buf) {
+ dma_free_coherent(NULL, EDMA_BUFSIZE_KMALLOC, \
+ drv_data->edma_tx_buf, dma_handle);
+ kfree(drv_data->edma_tx_buf);
+ dev_dbg(dev, "cannot allocate eDMA RX memory\n");
+ goto out_error_master_alloc;
+ }
+#endif
+
+ drv_data->mcr = (void *)&MCF_DSPI_DMCR;
+ drv_data->ctar = (void *)&MCF_DSPI_DCTAR0;
+ drv_data->dspi_sr = (void *)&MCF_DSPI_DSR;
+ drv_data->dspi_rser = (void *)&MCF_DSPI_DRSER;
+ drv_data->dspi_dtfr = (void *)&MCF_DSPI_DTFR;
+ drv_data->dspi_drfr = (void *)&MCF_DSPI_DRFR;
+
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "spi-par");
+ if (!memory_resource) {
+ dev_dbg(dev, "No spi-par memory\n");
+ goto out_error_master_alloc;
+ }
+ drv_data->par = (void *)memory_resource->start;
+
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "spi-int-level");
+ if (!memory_resource) {
+ dev_dbg(dev, "No spi-int-level memory\n");
+ goto out_error_master_alloc;
+ }
+ drv_data->int_icr = (void *)memory_resource->start;
+
+ memory_resource = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "spi-int-mask");
+ if (!memory_resource) {
+ dev_dbg(dev, "No spi-int-mask memory\n");
+ goto out_error_master_alloc;
+ }
+ drv_data->int_mr = (void *)memory_resource->start;
+
+ if (platform_info->irq_list) {
+ /* multiple IRQs */
+ int *irqlist = platform_info->irq_list;
+ while ((irq = *irqlist++)) {
+ int off = *irqlist++;
+ int lvl = *irqlist++;
+ int msk = *irqlist++;
+ status = request_irq(irq, dspi_interrupt, IRQF_DISABLED,
+ dev->bus_id, drv_data);
+ if (status < 0) {
+ dev_err(&pdev->dev,
+ "Unable to attach ColdFire DSPI interrupt\n");
+ goto out_error_master_alloc;
+ }
+
+ if (lvl)
+ *(drv_data->int_icr + off) = lvl;
+
+ if (msk)
+ *drv_data->int_mr &= ~msk;
+ }
+ }
+ else {
+ irq = platform_info->irq_vector;
+
+ status = request_irq(platform_info->irq_vector, dspi_interrupt,
+ IRQF_DISABLED, dev->bus_id, drv_data);
+ if (status < 0) {
+ dev_err(&pdev->dev, "Unable to attach ColdFire DSPI interrupt\n");
+ goto out_error_master_alloc;
+ }
+
+ *drv_data->int_icr = platform_info->irq_lp;
+ *drv_data->int_mr &= ~platform_info->irq_mask;
+ }
+
+ /* Now that we have all the addresses etc. Let's set it up */
+ if (platform_info->par_val)
+ *drv_data->par = platform_info->par_val;
+
+ /* Initial and start queue */
+ status = init_queue(drv_data);
+ if (status != 0) {
+ dev_err(&pdev->dev, "Problem initializing DSPI queue\n");
+ goto out_error_irq_alloc;
+ }
+ status = start_queue(drv_data);
+ if (status != 0) {
+ dev_err(&pdev->dev, "Problem starting DSPI queue\n");
+ goto out_error_irq_alloc;
+ }
+
+ /* Register with the SPI framework */
+ platform_set_drvdata(pdev, drv_data);
+ status = spi_register_master(master);
+ if (status != 0) {
+ dev_err(&pdev->dev, "Problem registering DSPI master\n");
+ status = -EINVAL;
+ goto out_error_queue_alloc;
+ }
+
+#if defined(SPI_DSPI_EDMA)
+ if (mcf_edma_request_channel(DSPI_DMA_TX_TCD,
+ edma_tx_handler,
+ NULL,
+ 0x0,
+ pdev,
+ NULL, /* spinlock */
+ DRIVER_NAME) < 0){
+ dev_err(&pdev->dev, "eDMA transmit channel request\n");
+ status = -EINVAL;
+ goto out_error_queue_alloc;
+ }
+
+ if (mcf_edma_request_channel(DSPI_DMA_RX_TCD,
+ edma_rx_handler,
+ NULL,
+ 0x0,
+ pdev,
+ NULL, /* spinlock */
+ DRIVER_NAME) < 0){
+ dev_err(&pdev->dev, "eDAM receive channel request\n");
+ status = -EINVAL;
+ mcf_edma_free_channel(DSPI_DMA_TX_TCD, pdev);
+ goto out_error_queue_alloc;
+ }
+#endif
+
+ printk(KERN_INFO "DSPI: Coldfire master initialized\n");
+ return status;
+
+out_error_queue_alloc:
+ destroy_queue(drv_data);
+
+out_error_irq_alloc:
+ free_irq(platform_info->irq_vector, drv_data);
+
+out_error_master_alloc:
+ spi_master_put(master);
+ return status;
+
+}
+
+static int coldfire_spi_remove(struct platform_device *pdev)
+{
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
+ int irq;
+ int status = 0;
+
+ if (!drv_data)
+ return 0;
+
+#if defined(SPI_DSPI_EDMA)
+ mcf_edma_free_channel(DSPI_DMA_TX_TCD, pdev);
+ mcf_edma_free_channel(DSPI_DMA_RX_TCD, pdev);
+#endif
+
+ /* Remove the queue */
+ status = destroy_queue(drv_data);
+ if (status != 0)
+ return status;
+
+ /* Release IRQ */
+ irq = platform_get_irq(pdev, 0);
+ if (irq >= 0)
+ free_irq(irq, drv_data);
+
+ /* Disconnect from the SPI framework */
+ spi_unregister_master(drv_data->master);
+
+ /* Prevent double remove */
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static void coldfire_spi_shutdown(struct platform_device *pdev)
+{
+ int status = coldfire_spi_remove(pdev);
+
+ if (status != 0)
+ dev_err(&pdev->dev, "shutdown failed with %d\n", status);
+}
+
+
+#ifdef CONFIG_PM
+static int suspend_devices(struct device *dev, void *pm_message)
+{
+ pm_message_t *state = pm_message;
+
+ if (dev->power.power_state.event != state->event) {
+ dev_warn(dev, "pm state does not match request\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static int coldfire_spi_suspend(struct platform_device *pdev,
+ pm_message_t state)
+{
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
+ int status = 0;
+
+ /* Check all childern for current power state */
+ if (device_for_each_child(&pdev->dev,
+ &state, suspend_devices) != 0) {
+ dev_warn(&pdev->dev, "suspend aborted\n");
+ return -1;
+ }
+
+ status = stop_queue(drv_data);
+ if (status != 0)
+ return status;
+
+ return 0;
+}
+
+static int coldfire_spi_resume(struct platform_device *pdev)
+{
+ struct driver_data *drv_data = platform_get_drvdata(pdev);
+ int status = 0;
+
+ /* Start the queue running */
+ status = start_queue(drv_data);
+ if (status != 0) {
+ dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
+ return status;
+ }
+
+ return 0;
+}
+#else
+#define coldfire_spi_suspend NULL
+#define coldfire_spi_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver driver = {
+ .driver = {
+ .name = "spi_coldfire",
+ .bus = &platform_bus_type,
+ .owner = THIS_MODULE,
+ },
+ .probe = coldfire_spi_probe,
+ .remove = __devexit_p(coldfire_spi_remove),
+ .shutdown = coldfire_spi_shutdown,
+ .suspend = coldfire_spi_suspend,
+ .resume = coldfire_spi_resume,
+};
+
+static int __init coldfire_spi_init(void)
+{
+ platform_driver_register(&driver);
+
+ return 0;
+}
+module_init(coldfire_spi_init);
+
+static void __exit coldfire_spi_exit(void)
+{
+ platform_driver_unregister(&driver);
+}
+module_exit(coldfire_spi_exit);
+
+MODULE_AUTHOR("Matt Waddel");
+MODULE_DESCRIPTION("ColdFire DSPI Contoller");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/include/asm-m68k/mcfdspi.h
@@ -0,0 +1,48 @@
+/*
+ * mcfdspi.h-DSPI controller for the ColdFire processors.
+ *
+ * Andrey Butok
+ * Copyright Freescale Semiconductor, Inc. 2008
+ *
+ * This file is based on mcfqspi.h
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ ***************************************************************************
+ * Changes:
+ * v0.001 25 March 2008 Andrey Butok
+ * Initial Release - developed on uClinux with 2.6.23 kernel.
+ *
+ */
+
+#ifndef MCFDSPI_H_
+#define MCFDSPI_H_
+
+struct coldfire_dspi_chip {
+ u8 mode;
+ u8 bits_per_word;
+ u16 void_write_data;
+ /* Only used in master mode */
+ u8 dbr; /* Double baud rate */
+ u8 pbr; /* Baud rate prescaler */
+ u8 br; /* Baud rate scaler */
+ u8 pcssck; /* PCS to SCK delay prescaler */
+ u8 pasc; /* After SCK delay prescaler */
+ u8 pdt; /* Delay after transfer prescaler */
+ u8 cssck; /* PCS to SCK delay scaler */
+ u8 asc; /* After SCK delay scaler */
+ u8 dt; /* Delay after transfer scaler */
+};
+#endif /*MCFDSPI_H_*/
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