![Andy Shevchenko](/assets/img/avatar_default.png)
The commit 30f3a6ab44
("spi: pxa2xx: Add support for both chip selects on
Intel Braswell") introduces a support of chipselects for Intel Braswell SPI
host controller. Though it missed to convert the PCI part of the driver.
Do conversion here which enables both chipselects on Intel Braswell when
enumerated via PCI.
We don't care about num_chipselect value since it is overrided inside core
driver.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
270 lines
6.2 KiB
C
270 lines
6.2 KiB
C
/*
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* CE4100's SPI device is more or less the same one as found on PXA
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*
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* Copyright (C) 2016, Intel Corporation
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*/
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#include <linux/clk-provider.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/spi/pxa2xx_spi.h>
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#include <linux/dmaengine.h>
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#include <linux/platform_data/dma-dw.h>
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enum {
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PORT_QUARK_X1000,
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PORT_BYT,
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PORT_MRFLD,
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PORT_BSW0,
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PORT_BSW1,
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PORT_BSW2,
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PORT_CE4100,
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PORT_LPT,
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};
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struct pxa_spi_info {
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enum pxa_ssp_type type;
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int port_id;
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int num_chipselect;
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unsigned long max_clk_rate;
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/* DMA channel request parameters */
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bool (*dma_filter)(struct dma_chan *chan, void *param);
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void *tx_param;
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void *rx_param;
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int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
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};
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static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
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static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
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static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
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static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
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static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
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static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
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static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
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static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
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static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
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static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
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static bool lpss_dma_filter(struct dma_chan *chan, void *param)
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{
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struct dw_dma_slave *dws = param;
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if (dws->dma_dev != chan->device->dev)
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return false;
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chan->private = dws;
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return true;
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}
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static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
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{
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struct pci_dev *dma_dev;
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c->num_chipselect = 1;
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c->max_clk_rate = 50000000;
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dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
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if (c->tx_param) {
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struct dw_dma_slave *slave = c->tx_param;
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slave->dma_dev = &dma_dev->dev;
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slave->m_master = 0;
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slave->p_master = 1;
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}
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if (c->rx_param) {
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struct dw_dma_slave *slave = c->rx_param;
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slave->dma_dev = &dma_dev->dev;
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slave->m_master = 0;
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slave->p_master = 1;
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}
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c->dma_filter = lpss_dma_filter;
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return 0;
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}
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static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
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{
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switch (PCI_FUNC(dev->devfn)) {
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case 0:
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c->port_id = 3;
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c->num_chipselect = 1;
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break;
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case 1:
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c->port_id = 5;
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c->num_chipselect = 4;
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break;
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case 2:
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c->port_id = 6;
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c->num_chipselect = 1;
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break;
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default:
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return -ENODEV;
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}
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return 0;
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}
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static struct pxa_spi_info spi_info_configs[] = {
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[PORT_CE4100] = {
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.type = PXA25x_SSP,
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.port_id = -1,
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.num_chipselect = -1,
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.max_clk_rate = 3686400,
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},
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[PORT_BYT] = {
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.type = LPSS_BYT_SSP,
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.port_id = 0,
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.setup = lpss_spi_setup,
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.tx_param = &byt_tx_param,
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.rx_param = &byt_rx_param,
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},
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[PORT_BSW0] = {
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.type = LPSS_BSW_SSP,
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.port_id = 0,
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.setup = lpss_spi_setup,
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.tx_param = &bsw0_tx_param,
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.rx_param = &bsw0_rx_param,
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},
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[PORT_BSW1] = {
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.type = LPSS_BSW_SSP,
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.port_id = 1,
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.setup = lpss_spi_setup,
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.tx_param = &bsw1_tx_param,
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.rx_param = &bsw1_rx_param,
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},
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[PORT_BSW2] = {
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.type = LPSS_BSW_SSP,
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.port_id = 2,
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.setup = lpss_spi_setup,
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.tx_param = &bsw2_tx_param,
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.rx_param = &bsw2_rx_param,
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},
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[PORT_MRFLD] = {
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.type = PXA27x_SSP,
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.max_clk_rate = 25000000,
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.setup = mrfld_spi_setup,
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},
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[PORT_QUARK_X1000] = {
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.type = QUARK_X1000_SSP,
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.port_id = -1,
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.num_chipselect = 1,
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.max_clk_rate = 50000000,
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},
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[PORT_LPT] = {
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.type = LPSS_LPT_SSP,
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.port_id = 0,
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.setup = lpss_spi_setup,
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.tx_param = &lpt_tx_param,
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.rx_param = &lpt_rx_param,
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},
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};
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static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *ent)
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{
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struct platform_device_info pi;
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int ret;
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struct platform_device *pdev;
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struct pxa2xx_spi_master spi_pdata;
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struct ssp_device *ssp;
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struct pxa_spi_info *c;
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char buf[40];
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ret = pcim_enable_device(dev);
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if (ret)
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return ret;
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ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
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if (ret)
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return ret;
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c = &spi_info_configs[ent->driver_data];
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if (c->setup) {
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ret = c->setup(dev, c);
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if (ret)
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return ret;
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}
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memset(&spi_pdata, 0, sizeof(spi_pdata));
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spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
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spi_pdata.dma_filter = c->dma_filter;
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spi_pdata.tx_param = c->tx_param;
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spi_pdata.rx_param = c->rx_param;
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spi_pdata.enable_dma = c->rx_param && c->tx_param;
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ssp = &spi_pdata.ssp;
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ssp->phys_base = pci_resource_start(dev, 0);
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ssp->mmio_base = pcim_iomap_table(dev)[0];
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ssp->irq = dev->irq;
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ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
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ssp->type = c->type;
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snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
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ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
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c->max_clk_rate);
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if (IS_ERR(ssp->clk))
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return PTR_ERR(ssp->clk);
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memset(&pi, 0, sizeof(pi));
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pi.parent = &dev->dev;
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pi.name = "pxa2xx-spi";
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pi.id = ssp->port_id;
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pi.data = &spi_pdata;
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pi.size_data = sizeof(spi_pdata);
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pdev = platform_device_register_full(&pi);
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if (IS_ERR(pdev)) {
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clk_unregister(ssp->clk);
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return PTR_ERR(pdev);
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}
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pci_set_drvdata(dev, pdev);
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return 0;
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}
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static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
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{
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struct platform_device *pdev = pci_get_drvdata(dev);
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struct pxa2xx_spi_master *spi_pdata;
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spi_pdata = dev_get_platdata(&pdev->dev);
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platform_device_unregister(pdev);
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clk_unregister(spi_pdata->ssp.clk);
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}
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static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
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{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
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{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
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{ PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
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{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
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{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
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{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
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{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
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{ PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
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{ },
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};
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MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
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static struct pci_driver pxa2xx_spi_pci_driver = {
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.name = "pxa2xx_spi_pci",
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.id_table = pxa2xx_spi_pci_devices,
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.probe = pxa2xx_spi_pci_probe,
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.remove = pxa2xx_spi_pci_remove,
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};
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module_pci_driver(pxa2xx_spi_pci_driver);
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MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
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