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/*
* CE4100's SPI device is more or less the same one as found on PXA
*
*/
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/dmaengine.h>
#include <linux/platform_data/dma-dw.h>
enum {
PORT_CE4100,
PORT_BYT,
};
struct pxa_spi_info {
enum pxa_ssp_type type;
int port_id;
int num_chipselect;
unsigned long max_clk_rate;
/* DMA channel request parameters */
void *tx_param;
void *rx_param;
};
static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
static struct dw_dma_slave byt_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 struct pxa_spi_info spi_info_configs[] = {
[PORT_CE4100] = {
.type = PXA25x_SSP,
.port_id = -1,
.num_chipselect = -1,
.max_clk_rate = 3686400,
},
[PORT_BYT] = {
.type = LPSS_SSP,
.port_id = 0,
.num_chipselect = 1,
.max_clk_rate = 50000000,
.tx_param = &byt_tx_param,
.rx_param = &byt_rx_param,
},
};
static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
struct platform_device_info pi;
int ret;
struct platform_device *pdev;
struct pxa2xx_spi_master spi_pdata;
struct ssp_device *ssp;
struct pxa_spi_info *c;
char buf[40];
struct pci_dev *dma_dev;
ret = pcim_enable_device(dev);
if (ret)
return ret;
ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
if (ret)
return ret;
c = &spi_info_configs[ent->driver_data];
memset(&spi_pdata, 0, sizeof(spi_pdata));
spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
c->num_chipselect : dev->devfn;
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->src_master = 1;
slave->dst_master = 0;
}
if (c->rx_param) {
struct dw_dma_slave *slave = c->rx_param;
slave->dma_dev = &dma_dev->dev;
slave->src_master = 1;
slave->dst_master = 0;
}
spi_pdata.dma_filter = lpss_dma_filter;
spi_pdata.tx_param = c->tx_param;
spi_pdata.rx_param = c->rx_param;
spi_pdata.enable_dma = c->rx_param && c->tx_param;
ssp = &spi_pdata.ssp;
ssp->phys_base = pci_resource_start(dev, 0);
ssp->mmio_base = pcim_iomap_table(dev)[0];
if (!ssp->mmio_base) {
dev_err(&dev->dev, "failed to ioremap() registers\n");
return -EIO;
}
ssp->irq = dev->irq;
ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
ssp->type = c->type;
snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
CLK_IS_ROOT, c->max_clk_rate);
if (IS_ERR(ssp->clk))
return PTR_ERR(ssp->clk);
memset(&pi, 0, sizeof(pi));
pi.parent = &dev->dev;
pi.name = "pxa2xx-spi";
pi.id = ssp->port_id;
pi.data = &spi_pdata;
pi.size_data = sizeof(spi_pdata);
pdev = platform_device_register_full(&pi);
if (IS_ERR(pdev)) {
clk_unregister(ssp->clk);
return PTR_ERR(pdev);
}
pci_set_drvdata(dev, pdev);
return 0;
}
static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
struct platform_device *pdev = pci_get_drvdata(dev);
struct pxa2xx_spi_master *spi_pdata;
spi_pdata = dev_get_platdata(&pdev->dev);
platform_device_unregister(pdev);
clk_unregister(spi_pdata->ssp.clk);
pci_set_drvdata(dev, NULL);
}
static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
{ },
};
MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
static struct pci_driver pxa2xx_spi_pci_driver = {
.name = "pxa2xx_spi_pci",
.id_table = pxa2xx_spi_pci_devices,
.probe = pxa2xx_spi_pci_probe,
.remove = pxa2xx_spi_pci_remove,
};
module_pci_driver(pxa2xx_spi_pci_driver);
MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
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