drivers/spi/spi-pxa2xx-pci.c

   1 /*
   2  * CE4100's SPI device is more or less the same one as found on PXA
   3  *
   4  */
   5 #include <linux/pci.h>
   6 #include <linux/platform_device.h>
   7 #include <linux/of_device.h>
   8 #include <linux/module.h>
   9 #include <linux/spi/pxa2xx_spi.h>
  10 #include <linux/clk-provider.h>
  11
  12 #include <linux/dmaengine.h>
  13 #include <linux/platform_data/dma-dw.h>
  14
  15 enum {
  16         PORT_CE4100,
  17         PORT_BYT,
  18         PORT_BSW0,
  19         PORT_BSW1,
  20         PORT_BSW2,
  21         PORT_QUARK_X1000,
  22         PORT_LPT,
  23 };
  24
  25 struct pxa_spi_info {
  26         enum pxa_ssp_type type;
  27         int port_id;
  28         int num_chipselect;
  29         unsigned long max_clk_rate;
  30
  31         /* DMA channel request parameters */
  32         void *tx_param;
  33         void *rx_param;
  34 };
  35
  36 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
  37 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
  38
  39 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
  40 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
  41 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
  42 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
  43 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
  44 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
  45
  46 static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
  47 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
  48
  49 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
  50 {
  51         struct dw_dma_slave *dws = param;
  52
  53         if (dws->dma_dev != chan->device->dev)
  54                 return false;
  55
  56         chan->private = dws;
  57         return true;
  58 }
  59
  60 static struct pxa_spi_info spi_info_configs[] = {
  61         [PORT_CE4100] = {
  62                 .type = PXA25x_SSP,
  63                 .port_id =  -1,
  64                 .num_chipselect = -1,
  65                 .max_clk_rate = 3686400,
  66         },
  67         [PORT_BYT] = {
  68                 .type = LPSS_BYT_SSP,
  69                 .port_id = 0,
  70                 .num_chipselect = 1,
  71                 .max_clk_rate = 50000000,
  72                 .tx_param = &byt_tx_param,
  73                 .rx_param = &byt_rx_param,
  74         },
  75         [PORT_BSW0] = {
  76                 .type = LPSS_BYT_SSP,
  77                 .port_id = 0,
  78                 .num_chipselect = 1,
  79                 .max_clk_rate = 50000000,
  80                 .tx_param = &bsw0_tx_param,
  81                 .rx_param = &bsw0_rx_param,
  82         },
  83         [PORT_BSW1] = {
  84                 .type = LPSS_BYT_SSP,
  85                 .port_id = 1,
  86                 .num_chipselect = 1,
  87                 .max_clk_rate = 50000000,
  88                 .tx_param = &bsw1_tx_param,
  89                 .rx_param = &bsw1_rx_param,
  90         },
  91         [PORT_BSW2] = {
  92                 .type = LPSS_BYT_SSP,
  93                 .port_id = 2,
  94                 .num_chipselect = 1,
  95                 .max_clk_rate = 50000000,
  96                 .tx_param = &bsw2_tx_param,
  97                 .rx_param = &bsw2_rx_param,
  98         },
  99         [PORT_QUARK_X1000] = {
 100                 .type = QUARK_X1000_SSP,
 101                 .port_id = -1,
 102                 .num_chipselect = 1,
 103                 .max_clk_rate = 50000000,
 104         },
 105         [PORT_LPT] = {
 106                 .type = LPSS_LPT_SSP,
 107                 .port_id = 0,
 108                 .num_chipselect = 1,
 109                 .max_clk_rate = 50000000,
 110                 .tx_param = &lpt_tx_param,
 111                 .rx_param = &lpt_rx_param,
 112         },
 113 };
 114
 115 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 116                 const struct pci_device_id *ent)
 117 {
 118         struct platform_device_info pi;
 119         int ret;
 120         struct platform_device *pdev;
 121         struct pxa2xx_spi_master spi_pdata;
 122         struct ssp_device *ssp;
 123         struct pxa_spi_info *c;
 124         char buf[40];
 125         struct pci_dev *dma_dev;
 126
 127         ret = pcim_enable_device(dev);
 128         if (ret)
 129                 return ret;
 130
 131         ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
 132         if (ret)
 133                 return ret;
 134
 135         c = &spi_info_configs[ent->driver_data];
 136
 137         memset(&spi_pdata, 0, sizeof(spi_pdata));
 138         spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
 139                                         c->num_chipselect : dev->devfn;
 140
 141         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
 142
 143         if (c->tx_param) {
 144                 struct dw_dma_slave *slave = c->tx_param;
 145
 146                 slave->dma_dev = &dma_dev->dev;
 147                 slave->m_master = 0;
 148                 slave->p_master = 1;
 149         }
 150
 151         if (c->rx_param) {
 152                 struct dw_dma_slave *slave = c->rx_param;
 153
 154                 slave->dma_dev = &dma_dev->dev;
 155                 slave->m_master = 0;
 156                 slave->p_master = 1;
 157         }
 158
 159         spi_pdata.dma_filter = lpss_dma_filter;
 160         spi_pdata.tx_param = c->tx_param;
 161         spi_pdata.rx_param = c->rx_param;
 162         spi_pdata.enable_dma = c->rx_param && c->tx_param;
 163
 164         ssp = &spi_pdata.ssp;
 165         ssp->phys_base = pci_resource_start(dev, 0);
 166         ssp->mmio_base = pcim_iomap_table(dev)[0];
 167         if (!ssp->mmio_base) {
 168                 dev_err(&dev->dev, "failed to ioremap() registers\n");
 169                 return -EIO;
 170         }
 171         ssp->irq = dev->irq;
 172         ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
 173         ssp->type = c->type;
 174
 175         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
 176         ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
 177                                         CLK_IS_ROOT, c->max_clk_rate);
 178          if (IS_ERR(ssp->clk))
 179                 return PTR_ERR(ssp->clk);
 180
 181         memset(&pi, 0, sizeof(pi));
 182         pi.parent = &dev->dev;
 183         pi.name = "pxa2xx-spi";
 184         pi.id = ssp->port_id;
 185         pi.data = &spi_pdata;
 186         pi.size_data = sizeof(spi_pdata);
 187
 188         pdev = platform_device_register_full(&pi);
 189         if (IS_ERR(pdev)) {
 190                 clk_unregister(ssp->clk);
 191                 return PTR_ERR(pdev);
 192         }
 193
 194         pci_set_drvdata(dev, pdev);
 195
 196         return 0;
 197 }
 198
 199 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 200 {
 201         struct platform_device *pdev = pci_get_drvdata(dev);
 202         struct pxa2xx_spi_master *spi_pdata;
 203
 204         spi_pdata = dev_get_platdata(&pdev->dev);
 205
 206         platform_device_unregister(pdev);
 207         clk_unregister(spi_pdata->ssp.clk);
 208 }
 209
 210 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
 211         { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
 212         { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
 213         { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
 214         { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
 215         { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
 216         { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
 217         { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
 218         { },
 219 };
 220 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 221
 222 static struct pci_driver pxa2xx_spi_pci_driver = {
 223         .name           = "pxa2xx_spi_pci",
 224         .id_table       = pxa2xx_spi_pci_devices,
 225         .probe          = pxa2xx_spi_pci_probe,
 226         .remove         = pxa2xx_spi_pci_remove,
 227 };
 228
 229 module_pci_driver(pxa2xx_spi_pci_driver);
 230
 231 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 232 MODULE_LICENSE("GPL v2");
 233 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");