linux-imx

/*

 * CE4100's SPI device is more or less the same one as found on PXA

 *

 * Copyright (C) 2016, Intel Corporation

 */

#include <linux/clk-provider.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/pci.h>

#include <linux/platform_device.h>

#include <linux/spi/pxa2xx_spi.h>

​

#include <linux/dmaengine.h>

#include <linux/platform_data/dma-dw.h>

​

enum {

    PORT_QUARK_X1000,

    PORT_BYT,

    PORT_MRFLD,

    PORT_BSW0,

    PORT_BSW1,

    PORT_BSW2,

    PORT_CE4100,

    PORT_LPT,

};

​

struct pxa_spi_info {

    enum pxa_ssp_type type;

    int port_id;

    int num_chipselect;

    unsigned long max_clk_rate;

​

    /* DMA channel request parameters */

    bool (*dma_filter)(struct dma_chan *chan, void *param);

    void *tx_param;

    void *rx_param;

​

    int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);

};

​

static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };

static struct dw_dma_slave byt_rx_param = { .src_id = 1 };

​

static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };

static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };

static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };

static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };

static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };

static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };

​

static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };

static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };

static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };

static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };

static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };

static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };

​

static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };

static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };

​

static bool lpss_dma_filter(struct dma_chan *chan, void *param)

{

    struct dw_dma_slave *dws = param;

​

    if (dws->dma_dev != chan->device->dev)

        return false;

​

    chan->private = dws;

    return true;

}

​

static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)

{

    struct pci_dev *dma_dev;

​

    c->num_chipselect = 1;

    c->max_clk_rate = 50000000;

​

    dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));

​

    if (c->tx_param) {

        struct dw_dma_slave *slave = c->tx_param;

​

        slave->dma_dev = &dma_dev->dev;

        slave->m_master = 0;

        slave->p_master = 1;

    }

​

    if (c->rx_param) {

        struct dw_dma_slave *slave = c->rx_param;

​

        slave->dma_dev = &dma_dev->dev;