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spi/pxa2xx-pci: Add PCI mode support for BayTrail LPSS SPI 

Similar to CE4100, BayTrail LPSS SPI can be PCI enumerated
as well. Thus, the functions are renamed from ce4100_xxx
to pxa2xx_spi_pci_xxx to clarify that this is a generic
PCI glue layer. Also, added required infrastructure to
support SPI hosts with different configurations.

This patch is based on Mika Westerberg's previous work.

Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Chew, Chiau Ee 2014-04-18 00:26:06 +08:00 committed by Mark Brown
parent c9eaa447e7
commit d6ba32d5c6
1 changed files with 61 additions and 15 deletions
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76
drivers/spi/spi-pxa2xx-pci.c
View File

@ -8,7 +8,43 @@
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
static int ce4100_spi_probe(struct pci_dev *dev,
enum {
PORT_CE4100,
PORT_BYT,
};
struct pxa_spi_info {
enum pxa_ssp_type type;
int port_id;
int num_chipselect;
int tx_slave_id;
int tx_chan_id;
int rx_slave_id;
int rx_chan_id;
};
static struct pxa_spi_info spi_info_configs[] = {
[PORT_CE4100] = {
.type = PXA25x_SSP,
.port_id = -1,
.num_chipselect = -1,
.tx_slave_id = -1,
.tx_chan_id = -1,
.rx_slave_id = -1,
.rx_chan_id = -1,
},
[PORT_BYT] = {
.type = LPSS_SSP,
.port_id = 0,
.num_chipselect = 1,
.tx_slave_id = 0,
.tx_chan_id = 0,
.rx_slave_id = 1,
.rx_chan_id = 1,
},
};
static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
struct platform_device_info pi;
@ -16,6 +52,7 @@ static int ce4100_spi_probe(struct pci_dev *dev,
struct platform_device *pdev;
struct pxa2xx_spi_master spi_pdata;
struct ssp_device *ssp;
struct pxa_spi_info *c;
ret = pcim_enable_device(dev);
if (ret)
@ -25,8 +62,16 @@ static int ce4100_spi_probe(struct pci_dev *dev,
if (ret)
return ret;
c = &spi_info_configs[ent->driver_data];
memset(&spi_pdata, 0, sizeof(spi_pdata));
spi_pdata.num_chipselect = dev->devfn;
spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
c->num_chipselect : dev->devfn;
spi_pdata.tx_slave_id = c->tx_slave_id;
spi_pdata.tx_chan_id = c->tx_chan_id;
spi_pdata.rx_slave_id = c->rx_slave_id;
spi_pdata.rx_chan_id = c->rx_chan_id;
spi_pdata.enable_dma = c->rx_slave_id >= 0 && c->tx_slave_id >= 0;
ssp = &spi_pdata.ssp;
ssp->phys_base = pci_resource_start(dev, 0);
@ -36,8 +81,8 @@ static int ce4100_spi_probe(struct pci_dev *dev,
return -EIO;
}
ssp->irq = dev->irq;
ssp->port_id = dev->devfn;
ssp->type = PXA25x_SSP;
ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
ssp->type = c->type;
memset(&pi, 0, sizeof(pi));
pi.parent = &dev->dev;
@ -55,28 +100,29 @@ static int ce4100_spi_probe(struct pci_dev *dev,
return 0;
}
static void ce4100_spi_remove(struct pci_dev *dev)
static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
struct platform_device *pdev = pci_get_drvdata(dev);
platform_device_unregister(pdev);
}
static const struct pci_device_id ce4100_spi_devices[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
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, ce4100_spi_devices);
MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
static struct pci_driver ce4100_spi_driver = {
.name = "ce4100_spi",
.id_table = ce4100_spi_devices,
.probe = ce4100_spi_probe,
.remove = ce4100_spi_remove,
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(ce4100_spi_driver);
module_pci_driver(pxa2xx_spi_pci_driver);
MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's 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>");