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  * Copyright (C) 2016, Intel Corporation
   5  */
   6 #include <linux/clk-provider.h>
   7 #include <linux/module.h>
   8 #include <linux/of_device.h>
   9 #include <linux/pci.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/spi/pxa2xx_spi.h>
  12
  13 #include <linux/dmaengine.h>
  14 #include <linux/platform_data/dma-dw.h>
  15
  16 enum {
  17         PORT_QUARK_X1000,
  18         PORT_BYT,
  19         PORT_MRFLD,
  20         PORT_BSW0,
  21         PORT_BSW1,
  22         PORT_BSW2,
  23         PORT_CE4100,
  24         PORT_LPT,
  25 };
  26
  27 struct pxa_spi_info {
  28         enum pxa_ssp_type type;
  29         int port_id;
  30         int num_chipselect;
  31         unsigned long max_clk_rate;
  32
  33         /* DMA channel request parameters */
  34         bool (*dma_filter)(struct dma_chan *chan, void *param);
  35         void *tx_param;
  36         void *rx_param;
  37
  38         int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
  39 };
  40
  41 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
  42 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
  43
  44 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
  45 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
  46 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
  47 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
  48 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
  49 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
  50
  51 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
  52 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
  53 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
  54 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
  55 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
  56 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
  57
  58 static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
  59 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
  60
  61 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
  62 {
  63         struct dw_dma_slave *dws = param;
  64
  65         if (dws->dma_dev != chan->device->dev)
  66                 return false;
  67
  68         chan->private = dws;
  69         return true;
  70 }
  71
  72 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
  73 {
  74         struct pci_dev *dma_dev;
  75
  76         c->num_chipselect = 1;
  77         c->max_clk_rate = 50000000;
  78
  79         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
  80
  81         if (c->tx_param) {
  82                 struct dw_dma_slave *slave = c->tx_param;
  83
  84                 slave->dma_dev = &dma_dev->dev;
  85                 slave->m_master = 0;
  86                 slave->p_master = 1;
  87         }
  88
  89         if (c->rx_param) {
  90                 struct dw_dma_slave *slave = c->rx_param;
  91
  92                 slave->dma_dev = &dma_dev->dev;
  93                 slave->m_master = 0;
  94                 slave->p_master = 1;
  95         }
  96
  97         c->dma_filter = lpss_dma_filter;
  98         return 0;
  99 }
 100
 101 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
 102 {
 103         struct pci_dev *dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
 104         struct dw_dma_slave *tx, *rx;
 105
 106         switch (PCI_FUNC(dev->devfn)) {
 107         case 0:
 108                 c->port_id = 3;
 109                 c->num_chipselect = 1;
 110                 c->tx_param = &mrfld3_tx_param;
 111                 c->rx_param = &mrfld3_rx_param;
 112                 break;
 113         case 1:
 114                 c->port_id = 5;
 115                 c->num_chipselect = 4;
 116                 c->tx_param = &mrfld5_tx_param;
 117                 c->rx_param = &mrfld5_rx_param;
 118                 break;
 119         case 2:
 120                 c->port_id = 6;
 121                 c->num_chipselect = 1;
 122                 c->tx_param = &mrfld6_tx_param;
 123                 c->rx_param = &mrfld6_rx_param;
 124                 break;
 125         default:
 126                 return -ENODEV;
 127         }
 128
 129         tx = c->tx_param;
 130         tx->dma_dev = &dma_dev->dev;
 131
 132         rx = c->rx_param;
 133         rx->dma_dev = &dma_dev->dev;
 134
 135         c->dma_filter = lpss_dma_filter;
 136         return 0;
 137 }
 138
 139 static struct pxa_spi_info spi_info_configs[] = {
 140         [PORT_CE4100] = {
 141                 .type = PXA25x_SSP,
 142                 .port_id =  -1,
 143                 .num_chipselect = -1,
 144                 .max_clk_rate = 3686400,
 145         },
 146         [PORT_BYT] = {
 147                 .type = LPSS_BYT_SSP,
 148                 .port_id = 0,
 149                 .setup = lpss_spi_setup,
 150                 .tx_param = &byt_tx_param,
 151                 .rx_param = &byt_rx_param,
 152         },
 153         [PORT_BSW0] = {
 154                 .type = LPSS_BSW_SSP,
 155                 .port_id = 0,
 156                 .setup = lpss_spi_setup,
 157                 .tx_param = &bsw0_tx_param,
 158                 .rx_param = &bsw0_rx_param,
 159         },
 160         [PORT_BSW1] = {
 161                 .type = LPSS_BSW_SSP,
 162                 .port_id = 1,
 163                 .setup = lpss_spi_setup,
 164                 .tx_param = &bsw1_tx_param,
 165                 .rx_param = &bsw1_rx_param,
 166         },
 167         [PORT_BSW2] = {
 168                 .type = LPSS_BSW_SSP,
 169                 .port_id = 2,
 170                 .setup = lpss_spi_setup,
 171                 .tx_param = &bsw2_tx_param,
 172                 .rx_param = &bsw2_rx_param,
 173         },
 174         [PORT_MRFLD] = {
 175                 .type = PXA27x_SSP,
 176                 .max_clk_rate = 25000000,
 177                 .setup = mrfld_spi_setup,
 178         },
 179         [PORT_QUARK_X1000] = {
 180                 .type = QUARK_X1000_SSP,
 181                 .port_id = -1,
 182                 .num_chipselect = 1,
 183                 .max_clk_rate = 50000000,
 184         },
 185         [PORT_LPT] = {
 186                 .type = LPSS_LPT_SSP,
 187                 .port_id = 0,
 188                 .setup = lpss_spi_setup,
 189                 .tx_param = &lpt_tx_param,
 190                 .rx_param = &lpt_rx_param,
 191         },
 192 };
 193
 194 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 195                 const struct pci_device_id *ent)
 196 {
 197         struct platform_device_info pi;
 198         int ret;
 199         struct platform_device *pdev;
 200         struct pxa2xx_spi_master spi_pdata;
 201         struct ssp_device *ssp;
 202         struct pxa_spi_info *c;
 203         char buf[40];
 204
 205         ret = pcim_enable_device(dev);
 206         if (ret)
 207                 return ret;
 208
 209         ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
 210         if (ret)
 211                 return ret;
 212
 213         c = &spi_info_configs[ent->driver_data];
 214         if (c->setup) {
 215                 ret = c->setup(dev, c);
 216                 if (ret)
 217                         return ret;
 218         }
 219
 220         memset(&spi_pdata, 0, sizeof(spi_pdata));
 221         spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
 222         spi_pdata.dma_filter = c->dma_filter;
 223         spi_pdata.tx_param = c->tx_param;
 224         spi_pdata.rx_param = c->rx_param;
 225         spi_pdata.enable_dma = c->rx_param && c->tx_param;
 226
 227         ssp = &spi_pdata.ssp;
 228         ssp->phys_base = pci_resource_start(dev, 0);
 229         ssp->mmio_base = pcim_iomap_table(dev)[0];
 230         ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
 231         ssp->type = c->type;
 232
 233         pci_set_master(dev);
 234
 235         ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
 236         if (ret < 0)
 237                 return ret;
 238         ssp->irq = pci_irq_vector(dev, 0);
 239
 240         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
 241         ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
 242                                            c->max_clk_rate);
 243          if (IS_ERR(ssp->clk))
 244                 return PTR_ERR(ssp->clk);
 245
 246         memset(&pi, 0, sizeof(pi));
 247         pi.fwnode = dev->dev.fwnode;
 248         pi.parent = &dev->dev;
 249         pi.name = "pxa2xx-spi";
 250         pi.id = ssp->port_id;
 251         pi.data = &spi_pdata;
 252         pi.size_data = sizeof(spi_pdata);
 253
 254         pdev = platform_device_register_full(&pi);
 255         if (IS_ERR(pdev)) {
 256                 clk_unregister(ssp->clk);
 257                 return PTR_ERR(pdev);
 258         }
 259
 260         pci_set_drvdata(dev, pdev);
 261
 262         return 0;
 263 }
 264
 265 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 266 {
 267         struct platform_device *pdev = pci_get_drvdata(dev);
 268         struct pxa2xx_spi_master *spi_pdata;
 269
 270         spi_pdata = dev_get_platdata(&pdev->dev);
 271
 272         platform_device_unregister(pdev);
 273         clk_unregister(spi_pdata->ssp.clk);
 274 }
 275
 276 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
 277         { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
 278         { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
 279         { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
 280         { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
 281         { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
 282         { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
 283         { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
 284         { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
 285         { },
 286 };
 287 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 288
 289 static struct pci_driver pxa2xx_spi_pci_driver = {
 290         .name           = "pxa2xx_spi_pci",
 291         .id_table       = pxa2xx_spi_pci_devices,
 292         .probe          = pxa2xx_spi_pci_probe,
 293         .remove         = pxa2xx_spi_pci_remove,
 294 };
 295
 296 module_pci_driver(pxa2xx_spi_pci_driver);
 297
 298 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 299 MODULE_LICENSE("GPL v2");
 300 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");