Source of spi-geni-qcom.c - linux-imx - PHYTEC BitBucket (Stash)

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    unsigned int tx_rem_bytes;
    unsigned int rx_rem_bytes;
    const struct spi_transfer *cur_xfer;
    struct completion xfer_done;
    unsigned int oversampling;
    spinlock_t lock;
    enum spi_m_cmd_opcode cur_mcmd;
    int irq;
};
​
static void handle_fifo_timeout(struct spi_master *spi,
                struct spi_message *msg);
​
static int get_spi_clk_cfg(unsigned int speed_hz,
            struct spi_geni_master *mas,
            unsigned int *clk_idx,
            unsigned int *clk_div)
{
    unsigned long sclk_freq;
    unsigned int actual_hz;
    struct geni_se *se = &mas->se;
    int ret;
​
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    actual_hz = sclk_freq / (mas->oversampling * *clk_div);
​
    dev_dbg(mas->dev, "req %u=>%u sclk %lu, idx %d, div %d\n", speed_hz,
                actual_hz, sclk_freq, *clk_idx, *clk_div);
    ret = clk_set_rate(se->clk, sclk_freq);
    if (ret)
        dev_err(mas->dev, "clk_set_rate failed %d\n", ret);
    return ret;
}
​
static void handle_fifo_timeout(struct spi_master *spi,
                struct spi_message *msg)
{
    struct spi_geni_master *mas = spi_master_get_devdata(spi);
    unsigned long time_left, flags;
    struct geni_se *se = &mas->se;
​
    spin_lock_irqsave(&mas->lock, flags);
    reinit_completion(&mas->xfer_done);
    mas->cur_mcmd = CMD_CANCEL;
    geni_se_cancel_m_cmd(se);
    writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
    spin_unlock_irqrestore(&mas->lock, flags);
    time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
    if (time_left)
        return;
​
    spin_lock_irqsave(&mas->lock, flags);
    reinit_completion(&mas->xfer_done);
    geni_se_abort_m_cmd(se);
    spin_unlock_irqrestore(&mas->lock, flags);
    time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
    if (!time_left)
        dev_err(mas->dev, "Failed to cancel/abort m_cmd\n");
}
​
static void spi_geni_set_cs(struct spi_device *slv, bool set_flag)
{
    struct spi_geni_master *mas = spi_master_get_devdata(slv->master);
    struct spi_master *spi = dev_get_drvdata(mas->dev);
    struct geni_se *se = &mas->se;
    unsigned long time_left;
​
    reinit_completion(&mas->xfer_done);
    pm_runtime_get_sync(mas->dev);
    if (!(slv->mode & SPI_CS_HIGH))
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​
    /*
     * TX_WATERMARK_REG should be set after SPI configuration and
     * setting up GENI SE engine, as driver starts data transfer
     * for the watermark interrupt.
     */
    if (m_cmd & SPI_TX_ONLY)
        writel(mas->tx_wm, se->base + SE_GENI_TX_WATERMARK_REG);
}
​
static void handle_fifo_timeout(struct spi_master *spi,
                struct spi_message *msg)
{
    struct spi_geni_master *mas = spi_master_get_devdata(spi);
    unsigned long time_left, flags;
    struct geni_se *se = &mas->se;
​
    spin_lock_irqsave(&mas->lock, flags);
    reinit_completion(&mas->xfer_done);
    mas->cur_mcmd = CMD_CANCEL;
    geni_se_cancel_m_cmd(se);
    writel(0, se->base + SE_GENI_TX_WATERMARK_REG);
    spin_unlock_irqrestore(&mas->lock, flags);
    time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
    if (time_left)
        return;
​
    spin_lock_irqsave(&mas->lock, flags);
    reinit_completion(&mas->xfer_done);
    geni_se_abort_m_cmd(se);
    spin_unlock_irqrestore(&mas->lock, flags);
    time_left = wait_for_completion_timeout(&mas->xfer_done, HZ);
    if (!time_left)
        dev_err(mas->dev, "Failed to cancel/abort m_cmd\n");
}
​
static int spi_geni_transfer_one(struct spi_master *spi,
                struct spi_device *slv,
                struct spi_transfer *xfer)
{
    struct spi_geni_master *mas = spi_master_get_devdata(spi);
​
    /* Terminate and return success for 0 byte length transfer */
    if (!xfer->len)
        return 0;
​