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