cregit-Linux how code gets into the kernel

Release 4.14 drivers/spi/spi-bfin5xx.c

Directory: drivers/spi
/*
 * Blackfin On-Chip SPI Driver
 *
 * Copyright 2004-2010 Analog Devices Inc.
 *
 * Enter bugs at http://blackfin.uclinux.org/
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/spi/spi.h>
#include <linux/workqueue.h>

#include <asm/dma.h>
#include <asm/portmux.h>
#include <asm/bfin5xx_spi.h>
#include <asm/cacheflush.h>


#define DRV_NAME	"bfin-spi"

#define DRV_AUTHOR	"Bryan Wu, Luke Yang"

#define DRV_DESC	"Blackfin on-chip SPI Controller Driver"

#define DRV_VERSION	"1.0"


MODULE_AUTHOR(DRV_AUTHOR);

MODULE_DESCRIPTION(DRV_DESC);
MODULE_LICENSE("GPL");


#define START_STATE	((void *)0)

#define RUNNING_STATE	((void *)1)

#define DONE_STATE	((void *)2)

#define ERROR_STATE	((void *)-1)

struct bfin_spi_master_data;


struct bfin_spi_transfer_ops {
	
void (*write) (struct bfin_spi_master_data *);
	
void (*read) (struct bfin_spi_master_data *);
	
void (*duplex) (struct bfin_spi_master_data *);
};


struct bfin_spi_master_data {
	/* Driver model hookup */
	
struct platform_device *pdev;

	/* SPI framework hookup */
	
struct spi_master *master;

	/* Regs base of SPI controller */
	
struct bfin_spi_regs __iomem *regs;

	/* Pin request list */
	
u16 *pin_req;

	/* BFIN hookup */
	
struct bfin5xx_spi_master *master_info;

	
struct work_struct pump_messages;
	
spinlock_t lock;
	
struct list_head queue;
	
int busy;
	
bool running;

	/* Message Transfer pump */
	
struct tasklet_struct pump_transfers;

	/* Current message transfer state info */
	
struct spi_message *cur_msg;
	
struct spi_transfer *cur_transfer;
	
struct bfin_spi_slave_data *cur_chip;
	
size_t len_in_bytes;
	
size_t len;
	
void *tx;
	
void *tx_end;
	
void *rx;
	
void *rx_end;

	/* DMA stuffs */
	
int dma_channel;
	
int dma_mapped;
	
int dma_requested;
	
dma_addr_t rx_dma;
	
dma_addr_t tx_dma;

	
int irq_requested;
	
int spi_irq;

	
size_t rx_map_len;
	
size_t tx_map_len;
	
u8 n_bytes;
	
u16 ctrl_reg;
	
u16 flag_reg;

	
int cs_change;
	
const struct bfin_spi_transfer_ops *ops;
};


struct bfin_spi_slave_data {
	
u16 ctl_reg;
	
u16 baud;
	
u16 flag;

	
u8 chip_select_num;
	
u8 enable_dma;
	
u16 cs_chg_udelay;	/* Some devices require > 255usec delay */
	
u32 cs_gpio;
	
u16 idle_tx_val;
	
u8 pio_interrupt;	/* use spi data irq */
	
const struct bfin_spi_transfer_ops *ops;
};


static void bfin_spi_enable(struct bfin_spi_master_data *drv_data) { bfin_write_or(&drv_data->regs->ctl, BIT_CTL_ENABLE); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu1669.57%360.00%
Mike Frysinger730.43%240.00%
Total23100.00%5100.00%


static void bfin_spi_disable(struct bfin_spi_master_data *drv_data) { bfin_write_and(&drv_data->regs->ctl, ~BIT_CTL_ENABLE); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu1770.83%360.00%
Mike Frysinger729.17%240.00%
Total24100.00%5100.00%

/* Caculate the SPI_BAUD register value based on input HZ */
static u16 hz_to_spi_baud(u32 speed_hz) { u_long sclk = get_sclk(); u16 spi_baud = (sclk / (2 * speed_hz)); if ((sclk % (2 * speed_hz)) > 0) spi_baud++; if (spi_baud < MIN_SPI_BAUD_VAL) spi_baud = MIN_SPI_BAUD_VAL; return spi_baud; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu4882.76%150.00%
Michael Hennerich1017.24%150.00%
Total58100.00%2100.00%


static int bfin_spi_flush(struct bfin_spi_master_data *drv_data) { unsigned long limit = loops_per_jiffy << 1; /* wait for stop and clear stat */ while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_SPIF) && --limit) cpu_relax(); bfin_write(&drv_data->regs->stat, BIT_STAT_CLR); return limit; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu4374.14%342.86%
Mike Frysinger1424.14%342.86%
Roel Kluin11.72%114.29%
Total58100.00%7100.00%

/* Chip select operation functions for cs_change flag */
static void bfin_spi_cs_active(struct bfin_spi_master_data *drv_data, struct bfin_spi_slave_data *chip) { if (likely(chip->chip_select_num < MAX_CTRL_CS)) bfin_write_and(&drv_data->regs->flg, ~chip->flag); else gpio_set_value(chip->cs_gpio, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Michael Hennerich2038.46%114.29%
Bryan Wu2038.46%228.57%
Mike Frysinger1019.23%342.86%
Barry Song23.85%114.29%
Total52100.00%7100.00%


static void bfin_spi_cs_deactive(struct bfin_spi_master_data *drv_data, struct bfin_spi_slave_data *chip) { if (likely(chip->chip_select_num < MAX_CTRL_CS)) bfin_write_or(&drv_data->regs->flg, chip->flag); else gpio_set_value(chip->cs_gpio, 1); /* Move delay here for consistency */ if (chip->cs_chg_udelay) udelay(chip->cs_chg_udelay); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu3452.31%337.50%
Michael Hennerich1929.23%112.50%
Mike Frysinger1015.38%337.50%
Barry Song23.08%112.50%
Total65100.00%8100.00%

/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */
static inline void bfin_spi_cs_enable(struct bfin_spi_master_data *drv_data, struct bfin_spi_slave_data *chip) { if (chip->chip_select_num < MAX_CTRL_CS) bfin_write_or(&drv_data->regs->flg, chip->flag >> 8); }

Contributors

PersonTokensPropCommitsCommitProp
Barry Song3278.05%250.00%
Mike Frysinger921.95%250.00%
Total41100.00%4100.00%


static inline void bfin_spi_cs_disable(struct bfin_spi_master_data *drv_data, struct bfin_spi_slave_data *chip) { if (chip->chip_select_num < MAX_CTRL_CS) bfin_write_and(&drv_data->regs->flg, ~(chip->flag >> 8)); }

Contributors

PersonTokensPropCommitsCommitProp
Barry Song3579.55%250.00%
Mike Frysinger920.45%250.00%
Total44100.00%4100.00%

/* stop controller and re-config current chip*/
static void bfin_spi_restore_state(struct bfin_spi_master_data *drv_data) { struct bfin_spi_slave_data *chip = drv_data->cur_chip; /* Clear status and disable clock */ bfin_write(&drv_data->regs->stat, BIT_STAT_CLR); bfin_spi_disable(drv_data); dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n"); SSYNC(); /* Load the registers */ bfin_write(&drv_data->regs->ctl, chip->ctl_reg); bfin_write(&drv_data->regs->baud, chip->baud); bfin_spi_enable(drv_data); bfin_spi_cs_active(drv_data, chip); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu5558.51%650.00%
Mike Frysinger2223.40%325.00%
Sonic Zhang1414.89%216.67%
Barry Song33.19%18.33%
Total94100.00%12100.00%

/* used to kick off transfer in rx mode and read unwanted RX data */
static inline void bfin_spi_dummy_read(struct bfin_spi_master_data *drv_data) { (void) bfin_read(&drv_data->regs->rdbr); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu1248.00%233.33%
Mike Frysinger832.00%350.00%
Wolfgang Mües520.00%116.67%
Total25100.00%6100.00%


static void bfin_spi_u8_writer(struct bfin_spi_master_data *drv_data) { /* clear RXS (we check for RXS inside the loop) */ bfin_spi_dummy_read(drv_data); while (drv_data->tx < drv_data->tx_end) { bfin_write(&drv_data->regs->tdbr, (*(u8 *) (drv_data->tx++))); /* wait until transfer finished. checking SPIF or TXS may not guarantee transfer completion */ while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); /* discard RX data and clear RXS */ bfin_spi_dummy_read(drv_data); } }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu4657.50%333.33%
Mike Frysinger2126.25%444.44%
Wolfgang Mües911.25%111.11%
Sonic Zhang45.00%111.11%
Total80100.00%9100.00%


static void bfin_spi_u8_reader(struct bfin_spi_master_data *drv_data) { u16 tx_val = drv_data->cur_chip->idle_tx_val; /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); while (drv_data->rx < drv_data->rx_end) { bfin_write(&drv_data->regs->tdbr, tx_val); while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); *(u8 *) (drv_data->rx++) = bfin_read(&drv_data->regs->rdbr); } }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu5863.04%444.44%
Mike Frysinger2325.00%444.44%
Wolfgang Mües1111.96%111.11%
Total92100.00%9100.00%


static void bfin_spi_u8_duplex(struct bfin_spi_master_data *drv_data) { /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); while (drv_data->rx < drv_data->rx_end) { bfin_write(&drv_data->regs->tdbr, (*(u8 *) (drv_data->tx++))); while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); *(u8 *) (drv_data->rx++) = bfin_read(&drv_data->regs->rdbr); } }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu4042.11%333.33%
Mike Frysinger3637.89%444.44%
Sonic Zhang1212.63%111.11%
Wolfgang Mües77.37%111.11%
Total95100.00%9100.00%

static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u8 = { .write = bfin_spi_u8_writer, .read = bfin_spi_u8_reader, .duplex = bfin_spi_u8_duplex, };
static void bfin_spi_u16_writer(struct bfin_spi_master_data *drv_data) { /* clear RXS (we check for RXS inside the loop) */ bfin_spi_dummy_read(drv_data); while (drv_data->tx < drv_data->tx_end) { bfin_write(&drv_data->regs->tdbr, (*(u16 *) (drv_data->tx))); drv_data->tx += 2; /* wait until transfer finished. checking SPIF or TXS may not guarantee transfer completion */ while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); /* discard RX data and clear RXS */ bfin_spi_dummy_read(drv_data); } }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger4047.06%342.86%
Bryan Wu3642.35%342.86%
Wolfgang Mües910.59%114.29%
Total85100.00%7100.00%


static void bfin_spi_u16_reader(struct bfin_spi_master_data *drv_data) { u16 tx_val = drv_data->cur_chip->idle_tx_val; /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); while (drv_data->rx < drv_data->rx_end) { bfin_write(&drv_data->regs->tdbr, tx_val); while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); *(u16 *) (drv_data->rx) = bfin_read(&drv_data->regs->rdbr); drv_data->rx += 2; } }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger6061.86%350.00%
Bryan Wu3738.14%350.00%
Total97100.00%6100.00%


static void bfin_spi_u16_duplex(struct bfin_spi_master_data *drv_data) { /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); while (drv_data->rx < drv_data->rx_end) { bfin_write(&drv_data->regs->tdbr, (*(u16 *) (drv_data->tx))); drv_data->tx += 2; while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); *(u16 *) (drv_data->rx) = bfin_read(&drv_data->regs->rdbr); drv_data->rx += 2; } }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu7369.52%342.86%
Mike Frysinger2019.05%342.86%
Wolfgang Mües1211.43%114.29%
Total105100.00%7100.00%

static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u16 = { .write = bfin_spi_u16_writer, .read = bfin_spi_u16_reader, .duplex = bfin_spi_u16_duplex, }; /* test if there is more transfer to be done */
static void *bfin_spi_next_transfer(struct bfin_spi_master_data *drv_data) { struct spi_message *msg = drv_data->cur_msg; struct spi_transfer *trans = drv_data->cur_transfer; /* 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); return RUNNING_STATE; } else return DONE_STATE; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu6997.18%133.33%
Mike Frysinger22.82%266.67%
Total71100.00%3100.00%

/* * caller already set message->status; * dma and pio irqs are blocked give finished message back */
static void bfin_spi_giveback(struct bfin_spi_master_data *drv_data) { struct bfin_spi_slave_data *chip = drv_data->cur_chip; unsigned long flags; struct spi_message *msg; 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; schedule_work(&drv_data->pump_messages); spin_unlock_irqrestore(&drv_data->lock, flags); msg->state = NULL; if (!drv_data->cs_change) bfin_spi_cs_deactive(drv_data, chip); /* Not stop spi in autobuffer mode */ if (drv_data->tx_dma != 0xFFFF) bfin_spi_disable(drv_data); if (msg->complete) msg->complete(msg->context); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu11890.77%342.86%
Yi Li75.38%114.29%
Mike Frysinger43.08%228.57%
Bhaktipriya Shridhar10.77%114.29%
Total130100.00%7100.00%

/* spi data irq handler */
static irqreturn_t bfin_spi_pio_irq_handler(int irq, void *dev_id) { struct bfin_spi_master_data *drv_data = dev_id; struct bfin_spi_slave_data *chip = drv_data->cur_chip; struct spi_message *msg = drv_data->cur_msg; int n_bytes = drv_data->n_bytes; int loop = 0; /* wait until transfer finished. */ while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_RXS)) cpu_relax(); if ((drv_data->tx && drv_data->tx >= drv_data->tx_end) || (drv_data->rx && drv_data->rx >= (drv_data->rx_end - n_bytes))) { /* last read */ if (drv_data->rx) { dev_dbg(&drv_data->pdev->dev, "last read\n"); if (!(n_bytes % 2)) { u16 *buf = (u16 *)drv_data->rx; for (loop = 0; loop < n_bytes / 2; loop++) *buf++ = bfin_read(&drv_data->regs->rdbr); } else { u8 *buf = (u8 *)drv_data->rx; for (loop = 0; loop < n_bytes; loop++) *buf++ = bfin_read(&drv_data->regs->rdbr); } drv_data->rx += n_bytes; } msg->actual_length += drv_data->len_in_bytes; if (drv_data->cs_change) bfin_spi_cs_deactive(drv_data, chip); /* Move to next transfer */ msg->state = bfin_spi_next_transfer(drv_data); disable_irq_nosync(drv_data->spi_irq); /* Schedule transfer tasklet */ tasklet_schedule(&drv_data->pump_transfers); return IRQ_HANDLED; } if (drv_data->rx && drv_data->tx) { /* duplex */ dev_dbg(&drv_data->pdev->dev, "duplex: write_TDBR\n"); if (!(n_bytes % 2)) { u16 *buf = (u16 *)drv_data->rx; u16 *buf2 = (u16 *)drv_data->tx; for (loop = 0; loop < n_bytes / 2; loop++) { *buf++ = bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, *buf2++); } } else { u8 *buf = (u8 *)drv_data->rx; u8 *buf2 = (u8 *)drv_data->tx; for (loop = 0; loop < n_bytes; loop++) { *buf++ = bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, *buf2++); } } } else if (drv_data->rx) { /* read */ dev_dbg(&drv_data->pdev->dev, "read: write_TDBR\n"); if (!(n_bytes % 2)) { u16 *buf = (u16 *)drv_data->rx; for (loop = 0; loop < n_bytes / 2; loop++) { *buf++ = bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, chip->idle_tx_val); } } else { u8 *buf = (u8 *)drv_data->rx; for (loop = 0; loop < n_bytes; loop++) { *buf++ = bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, chip->idle_tx_val); } } } else if (drv_data->tx) { /* write */ dev_dbg(&drv_data->pdev->dev, "write: write_TDBR\n"); if (!(n_bytes % 2)) { u16 *buf = (u16 *)drv_data->tx; for (loop = 0; loop < n_bytes / 2; loop++) { bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, *buf++); } } else { u8 *buf = (u8 *)drv_data->tx; for (loop = 0; loop < n_bytes; loop++) { bfin_read(&drv_data->regs->rdbr); bfin_write(&drv_data->regs->tdbr, *buf++); } } } if (drv_data->tx) drv_data->tx += n_bytes; if (drv_data->rx) drv_data->rx += n_bytes; return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Yi Li27435.68%212.50%
Bob Liu25533.20%16.25%
Mike Frysinger12916.80%743.75%
Bryan Wu9812.76%531.25%
Scott Jiang121.56%16.25%
Total768100.00%16100.00%


static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id) { struct bfin_spi_master_data *drv_data = dev_id; struct bfin_spi_slave_data *chip = drv_data->cur_chip; struct spi_message *msg = drv_data->cur_msg; unsigned long timeout; unsigned short dmastat = get_dma_curr_irqstat(drv_data->dma_channel); u16 spistat = bfin_read(&drv_data->regs->stat); dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler dmastat:0x%x spistat:0x%x\n", dmastat, spistat); if (drv_data->rx != NULL) { u16 cr = bfin_read(&drv_data->regs->ctl); /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); bfin_write(&drv_data->regs->ctl, cr & ~BIT_CTL_ENABLE); /* Disable SPI */ bfin_write(&drv_data->regs->ctl, cr & ~BIT_CTL_TIMOD); /* Restore State */ bfin_write(&drv_data->regs->stat, BIT_STAT_CLR); /* Clear Status */ } clear_dma_irqstat(drv_data->dma_channel); /* * wait for the last transaction shifted out. HRM states: * at this point there may still be data in the SPI DMA FIFO waiting * to be transmitted ... software needs to poll TXS in the SPI_STAT * register until it goes low for 2 successive reads */ if (drv_data->tx != NULL) { while ((bfin_read(&drv_data->regs->stat) & BIT_STAT_TXS) || (bfin_read(&drv_data->regs->stat) & BIT_STAT_TXS)) cpu_relax(); } dev_dbg(&drv_data->pdev->dev, "in dma_irq_handler dmastat:0x%x spistat:0x%x\n", dmastat, bfin_read(&drv_data->regs->stat)); timeout = jiffies + HZ; while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_SPIF)) if (!time_before(jiffies, timeout)) { dev_warn(&drv_data->pdev->dev, "timeout waiting for SPIF\n"); break; } else cpu_relax(); if ((dmastat & DMA_ERR) && (spistat & BIT_STAT_RBSY)) { msg->state = ERROR_STATE; dev_err(&drv_data->pdev->dev, "dma receive: fifo/buffer overflow\n"); } else { msg->actual_length += drv_data->len_in_bytes; if (drv_data->cs_change) bfin_spi_cs_deactive(drv_data, chip); /* Move to next transfer */ msg->state = bfin_spi_next_transfer(drv_data); } /* Schedule transfer tasklet */ tasklet_schedule(&drv_data->pump_transfers); /* free the irq handler before next transfer */ dev_dbg(&drv_data->pdev->dev, "disable dma channel irq%d\n", drv_data->dma_channel); dma_disable_irq_nosync(drv_data->dma_channel); return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Yi Li27571.06%114.29%
Mike Frysinger6015.50%342.86%
Michael Hennerich5012.92%114.29%
Barry Song10.26%114.29%
Jarkko Nikula10.26%114.29%
Total387100.00%7100.00%


static void bfin_spi_pump_transfers(unsigned long data) { struct bfin_spi_master_data *drv_data = (struct bfin_spi_master_data *)data; struct spi_message *message = NULL; struct spi_transfer *transfer = NULL; struct spi_transfer *previous = NULL; struct bfin_spi_slave_data *chip = NULL; unsigned int bits_per_word; u16 cr, cr_width = 0, dma_width, dma_config; u32 tranf_success = 1; u8 full_duplex = 0; /* Get current state information */ message = drv_data->cur_msg; transfer = drv_data->cur_transfer; chip = drv_data->cur_chip; /* * if msg is error or done, report it back using complete() callback */ /* Handle for abort */ if (message->state == ERROR_STATE) { dev_dbg(&drv_data->pdev->dev, "transfer: we've hit an error\n"); message->status = -EIO; bfin_spi_giveback(drv_data); return; } /* Handle end of message */ if (message->state == DONE_STATE) { dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n"); message->status = 0; bfin_spi_flush(drv_data); bfin_spi_giveback(drv_data); return; } /* Delay if requested at end of transfer */ if (message->state == RUNNING_STATE) { dev_dbg(&drv_data->pdev->dev, "transfer: still running ...\n"); previous = list_entry(transfer->transfer_list.prev, struct spi_transfer, transfer_list); if (previous->delay_usecs) udelay(previous->delay_usecs); } /* Flush any existing transfers that may be sitting in the hardware */ if (bfin_spi_flush(drv_data) == 0) { dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n"); message->status = -EIO; bfin_spi_giveback(drv_data); return; } if (transfer->len == 0) { /* Move to next transfer of this msg */ message->state = bfin_spi_next_transfer(drv_data); /* Schedule next transfer tasklet */ tasklet_schedule(&drv_data->pump_transfers); return; } if (transfer->tx_buf != NULL) { drv_data->tx = (void *)transfer->tx_buf; drv_data->tx_end = drv_data->tx + transfer->len; dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n", transfer->tx_buf, drv_data->tx_end); } else { drv_data->tx = NULL; } if (transfer->rx_buf != NULL) { full_duplex = transfer->tx_buf != NULL; drv_data->rx = transfer->rx_buf; drv_data->rx_end = drv_data->rx + transfer->len; dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n", transfer->rx_buf, drv_data->rx_end); } else { drv_data->rx = NULL; } drv_data->rx_dma = transfer->rx_dma; drv_data->tx_dma = transfer->tx_dma; drv_data->len_in_bytes = transfer->len; drv_data->cs_change = transfer->cs_change; /* Bits per word setup */ bits_per_word = transfer->bits_per_word; if (bits_per_word == 16) { drv_data->n_bytes = bits_per_word/8; drv_data->len = (transfer->len) >> 1; cr_width = BIT_CTL_WORDSIZE; drv_data->ops = &bfin_bfin_spi_transfer_ops_u16; } else if (bits_per_word == 8) { drv_data->n_bytes = bits_per_word/8; drv_data->len = transfer->len; drv_data->ops = &bfin_bfin_spi_transfer_ops_u8; } cr = bfin_read(&drv_data->regs->ctl) & ~(BIT_CTL_TIMOD | BIT_CTL_WORDSIZE); cr |= cr_width; bfin_write(&drv_data->regs->ctl, cr); dev_dbg(&drv_data->pdev->dev, "transfer: drv_data->ops is %p, chip->ops is %p, u8_ops is %p\n", drv_data->ops, chip->ops, &bfin_bfin_spi_transfer_ops_u8); message->state = RUNNING_STATE; dma_config = 0; bfin_write(&drv_data->regs->baud, hz_to_spi_baud(transfer->speed_hz)); bfin_write(&drv_data->regs->stat, BIT_STAT_CLR); bfin_spi_cs_active(drv_data, chip); dev_dbg(&drv_data->pdev->dev, "now pumping a transfer: width is %d, len is %d\n", cr_width, transfer->len); /* * Try to map dma buffer and do a dma transfer. If successful use, * different way to r/w according to the enable_dma settings and if * we are not doing a full duplex transfer (since the hardware does * not support full duplex DMA transfers). */ if (!full_duplex && drv_data->cur_chip->enable_dma && drv_data->len > 6) { unsigned long dma_start_addr, flags; disable_dma(drv_data->dma_channel); clear_dma_irqstat(drv_data->dma_channel); /* config dma channel */ dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n"); set_dma_x_count(drv_data->dma_channel, drv_data->len); if (cr_width == BIT_CTL_WORDSIZE) { set_dma_x_modify(drv_data->dma_channel, 2); dma_width = WDSIZE_16; } else { set_dma_x_modify(drv_data->dma_channel, 1); dma_width = WDSIZE_8; } /* poll for SPI completion before start */ while (!(bfin_read(&drv_data->regs->stat) & BIT_STAT_SPIF)) cpu_relax(); /* dirty hack for autobuffer DMA mode */ if (drv_data->tx_dma == 0xFFFF) { dev_dbg(&drv_data->pdev->dev, "doing autobuffer DMA out.\n"); /* no irq in autobuffer mode */ dma_config = (DMAFLOW_AUTO | RESTART | dma_width | DI_EN); set_dma_config(drv_data->dma_channel, dma_config); set_dma_start_addr(drv_data->dma_channel, (unsigned long)drv_data->tx); enable_dma(drv_data->dma_channel); /* start SPI transfer */ bfin_write(&drv_data->regs->ctl, cr | BIT_CTL_TIMOD_DMA_TX); /* just return here, there can only be one transfer * in this mode */ message->status = 0; bfin_spi_giveback(drv_data); return; } /* In dma mode, rx or tx must be NULL in one transfer */ dma_config = (RESTART | dma_width | DI_EN); if (drv_data->rx != NULL) { /* set transfer mode, and enable SPI */ dev_dbg(&drv_data->pdev->dev, "doing DMA in to %p (size %zx)\n", drv_data->rx, drv_data->len_in_bytes); /* invalidate caches, if needed */ if (bfin_addr_dcacheable((unsigned long) drv_data->rx)) invalidate_dcache_range((unsigned long) drv_data->rx, (unsigned long) (drv_data->rx + drv_data->len_in_bytes)); dma_config |= WNR; dma_start_addr = (unsigned long)drv_data->rx; cr |= BIT_CTL_TIMOD_DMA_RX | BIT_CTL_SENDOPT; } else if (drv_data->tx != NULL) { dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n"); /* flush caches, if needed */ if (bfin_addr_dcacheable((unsigned long) drv_data->tx)) flush_dcache_range((unsigned long) drv_data->tx, (unsigned long) (drv_data->tx + drv_data->len_in_bytes)); dma_start_addr = (unsigned long)drv_data->tx; cr |= BIT_CTL_TIMOD_DMA_TX; } else BUG(); /* oh man, here there be monsters ... and i dont mean the * fluffy cute ones from pixar, i mean the kind that'll eat * your data, kick your dog, and love it all. do *not* try * and change these lines unless you (1) heavily test DMA * with SPI flashes on a loaded system (e.g. ping floods), * (2) know just how broken the DMA engine interaction with * the SPI peripheral is, and (3) have someone else to blame * when you screw it all up anyways. */ set_dma_start_addr(drv_data->dma_channel, dma_start_addr); set_dma_config(drv_data->dma_channel, dma_config); local_irq_save(flags); SSYNC(); bfin_write(&drv_data->regs->ctl, cr); enable_dma(drv_data->dma_channel); dma_enable_irq(drv_data->dma_channel); local_irq_restore(flags); return; } /* * We always use SPI_WRITE mode (transfer starts with TDBR write). * SPI_READ mode (transfer starts with RDBR read) seems to have * problems with setting up the output value in TDBR prior to the * start of the transfer. */ bfin_write(&drv_data->regs->ctl, cr | BIT_CTL_TXMOD); if (chip->pio_interrupt) { /* SPI irq should have been disabled by now */ /* discard old RX data and clear RXS */ bfin_spi_dummy_read(drv_data); /* start transfer */ if (drv_data->tx == NULL) bfin_write(&drv_data->regs->tdbr, chip->idle_tx_val); else { int loop; if (bits_per_word == 16) { u16 *buf = (u16 *)drv_data->tx; for (loop = 0; loop < bits_per_word / 16; loop++) { bfin_write(&drv_data->regs->tdbr, *buf++); } } else if (bits_per_word == 8) { u8 *buf = (u8 *)drv_data->tx; for (loop = 0; loop < bits_per_word / 8; loop++) bfin_write(&drv_data->regs->tdbr, *buf++); } drv_data->tx += drv_data->n_bytes; } /* once TDBR is empty, interrupt is triggered */ enable_irq(drv_data->spi_irq); return; } /* IO mode */ dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n"); if (full_duplex) { /* full duplex mode */ BUG_ON((drv_data->tx_end - drv_data->tx) != (drv_data->rx_end - drv_data->rx)); dev_dbg(&drv_data->pdev->dev, "IO duplex: cr is 0x%x\n", cr); drv_data->ops->duplex(drv_data); if (drv_data->tx != drv_data->tx_end) tranf_success = 0; } else if (drv_data->tx != NULL) { /* write only half duplex */ dev_dbg(&drv_data->pdev->dev, "IO write: cr is 0x%x\n", cr); drv_data->ops->write(drv_data); if (drv_data->tx != drv_data->tx_end) tranf_success = 0; } else if (drv_data->rx != NULL) { /* read only half duplex */ dev_dbg(&drv_data->pdev->dev, "IO read: cr is 0x%x\n", cr); drv_data->ops->read(drv_data); if (drv_data->rx != drv_data->rx_end) tranf_success = 0; } if (!tranf_success) { dev_dbg(&drv_data->pdev->dev, "IO write error!\n"); message->state = ERROR_STATE; } else { /* Update total byte transferred */ message->actual_length += drv_data->len_in_bytes; /* Move to next transfer of this msg */ message->state = bfin_spi_next_transfer(drv_data); if (drv_data->cs_change && message->state != DONE_STATE) { bfin_spi_flush(drv_data); bfin_spi_cs_deactive(drv_data, chip); } } /* Schedule next transfer tasklet */ tasklet_schedule(&drv_data->pump_transfers); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu91859.38%617.14%
Mike Frysinger24916.11%1337.14%
Yi Li1187.63%25.71%
Vitja Makarov925.95%25.71%
Bob Liu865.56%25.71%
Wolfgang Mües291.88%12.86%
Sonic Zhang271.75%411.43%
Scott Jiang181.16%12.86%
Stephen Warren40.26%12.86%
Chen Gang20.13%12.86%
Jie Zhang20.13%12.86%
Lucas De Marchi10.06%12.86%
Total1546100.00%35100.00%

/* pop a msg from queue and kick off real transfer */
static void bfin_spi_pump_messages(struct work_struct *work) { struct bfin_spi_master_data *drv_data; unsigned long flags; drv_data = container_of(work, struct bfin_spi_master_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->running) { /* pumper kicked off but no work to do */ 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); /* Setup the SSP using the per chip configuration */ drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); bfin_spi_restore_state(drv_data); 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); dev_dbg(&drv_data->pdev->dev, "got a message to pump, state is set to: baud " "%d, flag 0x%x, ctl 0x%x\n", drv_data->cur_chip->baud, drv_data->cur_chip->flag, drv_data->cur_chip->ctl_reg); dev_dbg(&drv_data->pdev->dev, "the first transfer len is %d\n", drv_data->cur_transfer->len); /* Mark as busy and launch transfers */ tasklet_schedule(&drv_data->pump_transfers); drv_data->busy = 1; spin_unlock_irqrestore(&drv_data->lock, flags); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu24196.79%450.00%
Mike Frysinger62.41%337.50%
Jarkko Nikula20.80%112.50%
Total249100.00%8100.00%

/* * got a msg to transfer, queue it in drv_data->queue. * And kick off message pumper */
static int bfin_spi_transfer(struct spi_device *spi, struct spi_message *msg) { struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master); unsigned long flags; spin_lock_irqsave(&drv_data->lock, flags); if (!drv_data->running) { spin_unlock_irqrestore(&drv_data->lock, flags); return -ESHUTDOWN; } msg->actual_length = 0; msg->status = -EINPROGRESS; msg->state = START_STATE; dev_dbg(&spi->dev, "adding an msg in transfer() \n"); list_add_tail(&msg->queue, &drv_data->queue); if (drv_data->running && !drv_data->busy) schedule_work(&drv_data->pump_messages); spin_unlock_irqrestore(&drv_data->lock, flags); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu13395.68%233.33%
Mike Frysinger53.60%350.00%
Bhaktipriya Shridhar10.72%116.67%
Total139100.00%6100.00%

#define MAX_SPI_SSEL 7 static const u16 ssel[][MAX_SPI_SSEL] = { {P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3, P_SPI0_SSEL4, P_SPI0_SSEL5, P_SPI0_SSEL6, P_SPI0_SSEL7}, {P_SPI1_SSEL1, P_SPI1_SSEL2, P_SPI1_SSEL3, P_SPI1_SSEL4, P_SPI1_SSEL5, P_SPI1_SSEL6, P_SPI1_SSEL7}, {P_SPI2_SSEL1, P_SPI2_SSEL2, P_SPI2_SSEL3, P_SPI2_SSEL4, P_SPI2_SSEL5, P_SPI2_SSEL6, P_SPI2_SSEL7}, }; /* setup for devices (may be called multiple times -- not just first setup) */
static int bfin_spi_setup(struct spi_device *spi) { struct bfin5xx_spi_chip *chip_info; struct bfin_spi_slave_data *chip = NULL; struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master); u16 bfin_ctl_reg; int ret = -EINVAL; /* Only alloc (or use chip_info) on first setup */ chip_info = NULL; chip = spi_get_ctldata(spi); if (chip == NULL) { chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (!chip) { dev_err(&spi->dev, "cannot allocate chip data\n"); ret = -ENOMEM; goto error; } chip->enable_dma = 0; chip_info = spi->controller_data; } /* Let people set non-standard bits directly */ bfin_ctl_reg = BIT_CTL_OPENDRAIN | BIT_CTL_EMISO | BIT_CTL_PSSE | BIT_CTL_GM | BIT_CTL_SZ; /* chip_info isn't always needed */ if (chip_info) { /* Make sure people stop trying to set fields via ctl_reg * when they should actually be using common SPI framework. * Currently we let through: WOM EMISO PSSE GM SZ. * Not sure if a user actually needs/uses any of these, * but let's assume (for now) they do. */ if (chip_info->ctl_reg & ~bfin_ctl_reg) { dev_err(&spi->dev, "do not set bits in ctl_reg that the SPI framework manages\n"); goto error; } chip->enable_dma = chip_info->enable_dma != 0 && drv_data->master_info->enable_dma; chip->ctl_reg = chip_info->ctl_reg; chip->cs_chg_udelay = chip_info->cs_chg_udelay; chip->idle_tx_val = chip_info->idle_tx_val; chip->pio_interrupt = chip_info->pio_interrupt; } else { /* force a default base state */ chip->ctl_reg &= bfin_ctl_reg; } /* translate common spi framework into our register */ if (spi->mode & SPI_CPOL) chip->ctl_reg |= BIT_CTL_CPOL; if (spi->mode & SPI_CPHA) chip->ctl_reg |= BIT_CTL_CPHA; if (spi->mode & SPI_LSB_FIRST) chip->ctl_reg |= BIT_CTL_LSBF; /* we dont support running in slave mode (yet?) */ chip->ctl_reg |= BIT_CTL_MASTER; /* * Notice: for blackfin, the speed_hz is the value of register * SPI_BAUD, not the real baudrate */ chip->baud = hz_to_spi_baud(spi->max_speed_hz); chip->chip_select_num = spi->chip_select; if (chip->chip_select_num < MAX_CTRL_CS) { if (!(spi->mode & SPI_CPHA)) dev_warn(&spi->dev, "Warning: SPI CPHA not set: Slave Select not under software control!\n" "See Documentation/blackfin/bfin-spi-notes.txt\n"); chip->flag = (1 << spi->chip_select) << 8; } else chip->cs_gpio = chip->chip_select_num - MAX_CTRL_CS; if (chip->enable_dma && chip->pio_interrupt) { dev_err(&spi->dev, "enable_dma is set, do not set pio_interrupt\n"); goto error; } /* * if any one SPI chip is registered and wants DMA, request the * DMA channel for it */ if (chip->enable_dma && !drv_data->dma_requested) { /* register dma irq handler */ ret = request_dma(drv_data->dma_channel, "BFIN_SPI_DMA"); if (ret) { dev_err(&spi->dev, "Unable to request BlackFin SPI DMA channel\n"); goto error; } drv_data->dma_requested = 1; ret = set_dma_callback(drv_data->dma_channel, bfin_spi_dma_irq_handler, drv_data); if (ret) { dev_err(&spi->dev, "Unable to set dma callback\n"); goto error; } dma_disable_irq(drv_data->dma_channel); } if (chip->pio_interrupt && !drv_data->irq_requested) { ret = request_irq(drv_data->spi_irq, bfin_spi_pio_irq_handler, 0, "BFIN_SPI", drv_data); if (ret) { dev_err(&spi->dev, "Unable to register spi IRQ\n"); goto error; } drv_data->irq_requested = 1; /* we use write mode, spi irq has to be disabled here */ disable_irq(drv_data->spi_irq); } if (chip->chip_select_num >= MAX_CTRL_CS) { /* Only request on first setup */ if (spi_get_ctldata(spi) == NULL) { ret = gpio_request(chip->cs_gpio, spi->modalias); if (ret) { dev_err(&spi->dev, "gpio_request() error\n"); goto pin_error; } gpio_direction_output(chip->cs_gpio, 1); } } dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n", spi->modalias, spi->bits_per_word, chip->enable_dma); dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n", chip->ctl_reg, chip->flag); spi_set_ctldata(spi, chip); dev_dbg(&spi->dev, "chip select number is %d\n", chip->chip_select_num); if (chip->chip_select_num < MAX_CTRL_CS) { ret = peripheral_request(ssel[spi->master->bus_num] [chip->chip_select_num-1], spi->modalias); if (ret) { dev_err(&spi->dev, "peripheral_request() error\n"); goto pin_error; } } bfin_spi_cs_enable(drv_data, chip); bfin_spi_cs_deactive(drv_data, chip); return 0; pin_error: if (chip->chip_select_num >= MAX_CTRL_CS) gpio_free(chip->cs_gpio); else peripheral_free(ssel[spi->master->bus_num] [chip->chip_select_num - 1]); error: if (chip) { if (drv_data->dma_requested) free_dma(drv_data->dma_channel); drv_data->dma_requested = 0; kfree(chip); /* prevent free 'chip' twice */ spi_set_ctldata(spi, NULL); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Mack26433.12%14.55%
Bryan Wu24330.49%313.64%
Yi Li9411.79%14.55%
Mike Frysinger617.65%627.27%
Barry Song607.53%313.64%
Sonic Zhang465.77%29.09%
Michael Hennerich172.13%29.09%
Wolfgang Mües60.75%14.55%
Jarkko Nikula40.50%14.55%
Joe Perches10.13%14.55%
Yong Zhang10.13%14.55%
Total797100.00%22100.00%

/* * callback for spi framework. * clean driver specific data */
static void bfin_spi_cleanup(struct spi_device *spi) { struct bfin_spi_slave_data *chip = spi_get_ctldata(spi); struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master); if (!chip) return; if (chip->chip_select_num < MAX_CTRL_CS) { peripheral_free(ssel[spi->master->bus_num] [chip->chip_select_num-1]); bfin_spi_cs_disable(drv_data, chip); } else gpio_free(chip->cs_gpio); kfree(chip); /* prevent free 'chip' twice */ spi_set_ctldata(spi, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Sonic Zhang2526.04%111.11%
Bryan Wu2425.00%111.11%
Barry Song2323.96%222.22%
Mike Frysinger99.38%333.33%
Daniel Mack88.33%111.11%
Michael Hennerich77.29%111.11%
Total96100.00%9100.00%


static int bfin_spi_init_queue(struct bfin_spi_master_data *drv_data) { INIT_LIST_HEAD(&drv_data->queue); spin_lock_init(&drv_data->lock); drv_data->running = false; drv_data->busy = 0; /* init transfer tasklet */ tasklet_init(&drv_data->pump_transfers, bfin_spi_pump_transfers, (unsigned long)drv_data); INIT_WORK(&drv_data->pump_messages, bfin_spi_pump_messages); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu6391.30%125.00%
Mike Frysinger68.70%375.00%
Total69100.00%4100.00%


static int bfin_spi_start_queue(struct bfin_spi_master_data *drv_data) { unsigned long flags; spin_lock_irqsave(&drv_data->lock, flags); if (drv_data->running || drv_data->busy) { spin_unlock_irqrestore(&drv_data->lock, flags); return -EBUSY; } drv_data->running = true; drv_data->cur_msg = NULL; drv_data->cur_transfer = NULL; drv_data->cur_chip = NULL; spin_unlock_irqrestore(&drv_data->lock, flags); schedule_work(&drv_data->pump_messages); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu9093.75%120.00%
Mike Frysinger55.21%360.00%
Bhaktipriya Shridhar11.04%120.00%
Total96100.00%5100.00%


static int bfin_spi_stop_queue(struct bfin_spi_master_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->running = false; 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; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu11594.26%120.00%
Mike Frysinger43.28%360.00%
Vasily Khoruzhick32.46%120.00%
Total122100.00%5100.00%


static int bfin_spi_destroy_queue(struct bfin_spi_master_data *drv_data) { int status; status = bfin_spi_stop_queue(drv_data); if (status != 0) return status; flush_work(&drv_data->pump_messages); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu3585.37%125.00%
Bhaktipriya Shridhar37.32%125.00%
Mike Frysinger37.32%250.00%
Total41100.00%4100.00%


static int bfin_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct bfin5xx_spi_master *platform_info; struct spi_master *master; struct bfin_spi_master_data *drv_data; struct resource *res; int status = 0; platform_info = dev_get_platdata(dev); /* Allocate master with space for drv_data */ master = spi_alloc_master(dev, sizeof(*drv_data)); if (!master) { dev_err(&pdev->dev, "can not alloc spi_master\n"); return -ENOMEM; } drv_data = spi_master_get_devdata(master); drv_data->master = master; drv_data->master_info = platform_info; drv_data->pdev = pdev; drv_data->pin_req = platform_info->pin_req; /* the spi->mode bits supported by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); master->bus_num = pdev->id; master->num_chipselect = platform_info->num_chipselect; master->cleanup = bfin_spi_cleanup; master->setup = bfin_spi_setup; master->transfer = bfin_spi_transfer; /* Find and map our resources */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(dev, "Cannot get IORESOURCE_MEM\n"); status = -ENOENT; goto out_error_get_res; } drv_data->regs = ioremap(res->start, resource_size(res)); if (drv_data->regs == NULL) { dev_err(dev, "Cannot map IO\n"); status = -ENXIO; goto out_error_ioremap; } res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (res == NULL) { dev_err(dev, "No DMA channel specified\n"); status = -ENOENT; goto out_error_free_io; } drv_data->dma_channel = res->start; drv_data->spi_irq = platform_get_irq(pdev, 0); if (drv_data->spi_irq < 0) { dev_err(dev, "No spi pio irq specified\n"); status = -ENOENT; goto out_error_free_io; } /* Initial and start queue */ status = bfin_spi_init_queue(drv_data); if (status != 0) { dev_err(dev, "problem initializing queue\n"); goto out_error_queue_alloc; } status = bfin_spi_start_queue(drv_data); if (status != 0) { dev_err(dev, "problem starting queue\n"); goto out_error_queue_alloc; } status = peripheral_request_list(drv_data->pin_req, DRV_NAME); if (status != 0) { dev_err(&pdev->dev, ": Requesting Peripherals failed\n"); goto out_error_queue_alloc; } /* Reset SPI registers. If these registers were used by the boot loader, * the sky may fall on your head if you enable the dma controller. */ bfin_write(&drv_data->regs->ctl, BIT_CTL_CPHA | BIT_CTL_MASTER); bfin_write(&drv_data->regs->flg, 0xFF00); /* Register with the SPI framework */ platform_set_drvdata(pdev, drv_data); status = spi_register_master(master); if (status != 0) { dev_err(dev, "problem registering spi master\n"); goto out_error_queue_alloc; } dev_info(dev, "%s, Version %s, regs@%p, dma channel@%d\n", DRV_DESC, DRV_VERSION, drv_data->regs, drv_data->dma_channel); return status; out_error_queue_alloc: bfin_spi_destroy_queue(drv_data); out_error_free_io: iounmap(drv_data->regs); out_error_ioremap: out_error_get_res: spi_master_put(master); return status; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu37370.78%633.33%
Yi Li468.73%15.56%
Mike Frysinger275.12%422.22%
Vitja Makarov224.17%15.56%
Wolfgang Mües152.85%15.56%
Stephen Warren142.66%15.56%
Sonic Zhang132.47%15.56%
David Brownell112.09%15.56%
Jingoo Han30.57%15.56%
H Hartley Sweeten30.57%15.56%
Total527100.00%18100.00%

/* stop hardware and remove the driver */
static int bfin_spi_remove(struct platform_device *pdev) { struct bfin_spi_master_data *drv_data = platform_get_drvdata(pdev); int status = 0; if (!drv_data) return 0; /* Remove the queue */ status = bfin_spi_destroy_queue(drv_data); if (status != 0) return status; /* Disable the SSP at the peripheral and SOC level */ bfin_spi_disable(drv_data); /* Release DMA */ if (drv_data->master_info->enable_dma) { if (dma_channel_active(drv_data->dma_channel)) free_dma(drv_data->dma_channel); } if (drv_data->irq_requested) { free_irq(drv_data->spi_irq, drv_data); drv_data->irq_requested = 0; } /* Disconnect from the SPI framework */ spi_unregister_master(drv_data->master); peripheral_free_list(drv_data->pin_req); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu9475.20%337.50%
Yi Li2318.40%112.50%
Michael Hennerich32.40%112.50%
Mike Frysinger32.40%225.00%
Sonic Zhang21.60%112.50%
Total125100.00%8100.00%

#ifdef CONFIG_PM_SLEEP
static int bfin_spi_suspend(struct device *dev) { struct bfin_spi_master_data *drv_data = dev_get_drvdata(dev); int status = 0; status = bfin_spi_stop_queue(drv_data); if (status != 0) return status; drv_data->ctrl_reg = bfin_read(&drv_data->regs->ctl); drv_data->flag_reg = bfin_read(&drv_data->regs->flg); /* * reset SPI_CTL and SPI_FLG registers */ bfin_write(&drv_data->regs->ctl, BIT_CTL_CPHA | BIT_CTL_MASTER); bfin_write(&drv_data->regs->flg, 0xFF00); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu4242.00%116.67%
Mike Frysinger2727.00%350.00%
Barry Song2727.00%116.67%
Jingoo Han44.00%116.67%
Total100100.00%6100.00%


static int bfin_spi_resume(struct device *dev) { struct bfin_spi_master_data *drv_data = dev_get_drvdata(dev); int status = 0; bfin_write(&drv_data->regs->ctl, drv_data->ctrl_reg); bfin_write(&drv_data->regs->flg, drv_data->flag_reg); /* Start the queue running */ status = bfin_spi_start_queue(drv_data); if (status != 0) { dev_err(dev, "problem starting queue (%d)\n", status); return status; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu5463.53%116.67%
Mike Frysinger1517.65%350.00%
Barry Song1214.12%116.67%
Jingoo Han44.71%116.67%
Total85100.00%6100.00%

static SIMPLE_DEV_PM_OPS(bfin_spi_pm_ops, bfin_spi_suspend, bfin_spi_resume); #define BFIN_SPI_PM_OPS (&bfin_spi_pm_ops) #else #define BFIN_SPI_PM_OPS NULL #endif MODULE_ALIAS("platform:bfin-spi"); static struct platform_driver bfin_spi_driver = { .driver = { .name = DRV_NAME, .pm = BFIN_SPI_PM_OPS, }, .probe = bfin_spi_probe, .remove = bfin_spi_remove, };
static int __init bfin_spi_init(void) { return platform_driver_register(&bfin_spi_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu1381.25%133.33%
Mike Frysinger212.50%133.33%
Wolfram Sang16.25%133.33%
Total16100.00%3100.00%

subsys_initcall(bfin_spi_init);
static void __exit bfin_spi_exit(void) { platform_driver_unregister(&bfin_spi_driver); }

Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu1386.67%150.00%
Mike Frysinger213.33%150.00%
Total15100.00%2100.00%

module_exit(bfin_spi_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Bryan Wu355751.27%1516.13%
Mike Frysinger102714.80%2526.88%
Yi Li84812.22%33.23%
Bob Liu3414.91%22.15%
Daniel Mack2723.92%11.08%
Barry Song2042.94%66.45%
Sonic Zhang2042.94%77.53%
Michael Hennerich1301.87%66.45%
Vitja Makarov1171.69%33.23%
Wolfgang Mües1071.54%22.15%
Jingoo Han300.43%22.15%
Scott Jiang300.43%22.15%
Stephen Warren180.26%11.08%
David Brownell150.22%22.15%
Jarkko Nikula70.10%22.15%
Bhaktipriya Shridhar60.09%11.08%
H Hartley Sweeten30.04%11.08%
Wolfram Sang30.04%11.08%
Steven Miao30.04%11.08%
Vasily Khoruzhick30.04%11.08%
Tejun Heo30.04%11.08%
Chen Gang20.03%11.08%
Jie Zhang20.03%11.08%
Roel Kluin10.01%11.08%
Joe Perches10.01%11.08%
Lucas De Marchi10.01%11.08%
Kay Sievers10.01%11.08%
Rob Maris10.01%11.08%
Yong Zhang10.01%11.08%
Total6938100.00%93100.00%
Directory: drivers/spi
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.