mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 02:52:22 +00:00
e5262d0568
There are two SPI controllers exported by PCI subsystem for Intel Quark X1000. The SPI memory mapped I/O registers supported by Quark are different from the current implementation, and Quark only supports the registers of 'SSCR0', 'SSCR1', 'SSSR', 'SSDR', and 'DDS_RATE'. This patch is to enable the SPI for Intel Quark X1000. This piece of work is derived from Dan O'Donovan's initial work for Intel Quark X1000 SPI enabling. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Weike Chen <alvin.chen@intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
222 lines
5.2 KiB
C
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_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_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_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_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>");
|