linux/drivers/spi/spi-pxa2xx-pci.c
Jarkko Nikula 03fbf488ce spi: pxa2xx: Differentiate Intel LPSS types
Intel LPSS SPI properties differ between between platforms. Now private
registers offset 0x400 or 0x800 is autodetected but there is need to
support also other offset and handle a few other differences.

Prepare for that by splitting the LPSS_SSP type into compatible hardware
types and set it now based on PCI or ACPI ID. That type will be used to set
properties that differ between current and upcoming platforms.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-06-05 11:40:45 +01:00

222 lines
5.2 KiB
C

/*
* 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,
PORT_BSW0,
PORT_BSW1,
PORT_BSW2,
PORT_QUARK_X1000,
};
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 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 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_BYT_SSP,
.port_id = 0,
.num_chipselect = 1,
.max_clk_rate = 50000000,
.tx_param = &byt_tx_param,
.rx_param = &byt_rx_param,
},
[PORT_BSW0] = {
.type = LPSS_BYT_SSP,
.port_id = 0,
.num_chipselect = 1,
.max_clk_rate = 50000000,
.tx_param = &bsw0_tx_param,
.rx_param = &bsw0_rx_param,
},
[PORT_BSW1] = {
.type = LPSS_BYT_SSP,
.port_id = 1,
.num_chipselect = 1,
.max_clk_rate = 50000000,
.tx_param = &bsw1_tx_param,
.rx_param = &bsw1_rx_param,
},
[PORT_BSW2] = {
.type = LPSS_BYT_SSP,
.port_id = 2,
.num_chipselect = 1,
.max_clk_rate = 50000000,
.tx_param = &bsw2_tx_param,
.rx_param = &bsw2_rx_param,
},
[PORT_QUARK_X1000] = {
.type = QUARK_X1000_SSP,
.port_id = -1,
.num_chipselect = 1,
.max_clk_rate = 50000000,
},
};
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);
}
static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
{ },
};
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>");