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