drivers/spi/spi-pxa2xx-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * CE4100's SPI device is more or less the same one as found on PXA
   4  *
   5  * Copyright (C) 2016, Intel Corporation
   6  */
   7 #include <linux/clk-provider.h>
   8 #include <linux/module.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 dma_burst_size;
  39
  40         int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
  41 };
  42
  43 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
  44 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
  45
  46 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
  47 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
  48 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
  49 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
  50 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
  51 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
  52
  53 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
  54 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
  55 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
  56 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
  57 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
  58 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
  59
  60 static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
  61 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
  62
  63 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
  64 {
  65         struct dw_dma_slave *dws = param;
  66
  67         if (dws->dma_dev != chan->device->dev)
  68                 return false;
  69
  70         chan->private = dws;
  71         return true;
  72 }
  73
  74 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
  75 {
  76         struct pci_dev *dma_dev;
  77
  78         c->num_chipselect = 1;
  79         c->max_clk_rate = 50000000;
  80
  81         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
  82
  83         if (c->tx_param) {
  84                 struct dw_dma_slave *slave = c->tx_param;
  85
  86                 slave->dma_dev = &dma_dev->dev;
  87                 slave->m_master = 0;
  88                 slave->p_master = 1;
  89         }
  90
  91         if (c->rx_param) {
  92                 struct dw_dma_slave *slave = c->rx_param;
  93
  94                 slave->dma_dev = &dma_dev->dev;
  95                 slave->m_master = 0;
  96                 slave->p_master = 1;
  97         }
  98
  99         c->dma_filter = lpss_dma_filter;
 100         return 0;
 101 }
 102
 103 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
 104 {
 105         struct pci_dev *dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
 106         struct dw_dma_slave *tx, *rx;
 107
 108         switch (PCI_FUNC(dev->devfn)) {
 109         case 0:
 110                 c->port_id = 3;
 111                 c->num_chipselect = 1;
 112                 c->tx_param = &mrfld3_tx_param;
 113                 c->rx_param = &mrfld3_rx_param;
 114                 break;
 115         case 1:
 116                 c->port_id = 5;
 117                 c->num_chipselect = 4;
 118                 c->tx_param = &mrfld5_tx_param;
 119                 c->rx_param = &mrfld5_rx_param;
 120                 break;
 121         case 2:
 122                 c->port_id = 6;
 123                 c->num_chipselect = 1;
 124                 c->tx_param = &mrfld6_tx_param;
 125                 c->rx_param = &mrfld6_rx_param;
 126                 break;
 127         default:
 128                 return -ENODEV;
 129         }
 130
 131         tx = c->tx_param;
 132         tx->dma_dev = &dma_dev->dev;
 133
 134         rx = c->rx_param;
 135         rx->dma_dev = &dma_dev->dev;
 136
 137         c->dma_filter = lpss_dma_filter;
 138         c->dma_burst_size = 8;
 139         return 0;
 140 }
 141
 142 static struct pxa_spi_info spi_info_configs[] = {
 143         [PORT_CE4100] = {
 144                 .type = PXA25x_SSP,
 145                 .port_id =  -1,
 146                 .num_chipselect = -1,
 147                 .max_clk_rate = 3686400,
 148         },
 149         [PORT_BYT] = {
 150                 .type = LPSS_BYT_SSP,
 151                 .port_id = 0,
 152                 .setup = lpss_spi_setup,
 153                 .tx_param = &byt_tx_param,
 154                 .rx_param = &byt_rx_param,
 155         },
 156         [PORT_BSW0] = {
 157                 .type = LPSS_BSW_SSP,
 158                 .port_id = 0,
 159                 .setup = lpss_spi_setup,
 160                 .tx_param = &bsw0_tx_param,
 161                 .rx_param = &bsw0_rx_param,
 162         },
 163         [PORT_BSW1] = {
 164                 .type = LPSS_BSW_SSP,
 165                 .port_id = 1,
 166                 .setup = lpss_spi_setup,
 167                 .tx_param = &bsw1_tx_param,
 168                 .rx_param = &bsw1_rx_param,
 169         },
 170         [PORT_BSW2] = {
 171                 .type = LPSS_BSW_SSP,
 172                 .port_id = 2,
 173                 .setup = lpss_spi_setup,
 174                 .tx_param = &bsw2_tx_param,
 175                 .rx_param = &bsw2_rx_param,
 176         },
 177         [PORT_MRFLD] = {
 178                 .type = PXA27x_SSP,
 179                 .max_clk_rate = 25000000,
 180                 .setup = mrfld_spi_setup,
 181         },
 182         [PORT_QUARK_X1000] = {
 183                 .type = QUARK_X1000_SSP,
 184                 .port_id = -1,
 185                 .num_chipselect = 1,
 186                 .max_clk_rate = 50000000,
 187         },
 188         [PORT_LPT] = {
 189                 .type = LPSS_LPT_SSP,
 190                 .port_id = 0,
 191                 .setup = lpss_spi_setup,
 192                 .tx_param = &lpt_tx_param,
 193                 .rx_param = &lpt_rx_param,
 194         },
 195 };
 196
 197 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 198                 const struct pci_device_id *ent)
 199 {
 200         struct platform_device_info pi;
 201         int ret;
 202         struct platform_device *pdev;
 203         struct pxa2xx_spi_controller spi_pdata;
 204         struct ssp_device *ssp;
 205         struct pxa_spi_info *c;
 206         char buf[40];
 207
 208         ret = pcim_enable_device(dev);
 209         if (ret)
 210                 return ret;
 211
 212         ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
 213         if (ret)
 214                 return ret;
 215
 216         c = &spi_info_configs[ent->driver_data];
 217         if (c->setup) {
 218                 ret = c->setup(dev, c);
 219                 if (ret)
 220                         return ret;
 221         }
 222
 223         memset(&spi_pdata, 0, sizeof(spi_pdata));
 224         spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
 225         spi_pdata.dma_filter = c->dma_filter;
 226         spi_pdata.tx_param = c->tx_param;
 227         spi_pdata.rx_param = c->rx_param;
 228         spi_pdata.enable_dma = c->rx_param && c->tx_param;
 229         spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1;
 230
 231         ssp = &spi_pdata.ssp;
 232         ssp->phys_base = pci_resource_start(dev, 0);
 233         ssp->mmio_base = pcim_iomap_table(dev)[0];
 234         ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
 235         ssp->type = c->type;
 236
 237         pci_set_master(dev);
 238
 239         ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
 240         if (ret < 0)
 241                 return ret;
 242         ssp->irq = pci_irq_vector(dev, 0);
 243
 244         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
 245         ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
 246                                            c->max_clk_rate);
 247          if (IS_ERR(ssp->clk))
 248                 return PTR_ERR(ssp->clk);
 249
 250         memset(&pi, 0, sizeof(pi));
 251         pi.fwnode = dev->dev.fwnode;
 252         pi.parent = &dev->dev;
 253         pi.name = "pxa2xx-spi";
 254         pi.id = ssp->port_id;
 255         pi.data = &spi_pdata;
 256         pi.size_data = sizeof(spi_pdata);
 257
 258         pdev = platform_device_register_full(&pi);
 259         if (IS_ERR(pdev)) {
 260                 clk_unregister(ssp->clk);
 261                 return PTR_ERR(pdev);
 262         }
 263
 264         pci_set_drvdata(dev, pdev);
 265
 266         return 0;
 267 }
 268
 269 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 270 {
 271         struct platform_device *pdev = pci_get_drvdata(dev);
 272         struct pxa2xx_spi_controller *spi_pdata;
 273
 274         spi_pdata = dev_get_platdata(&pdev->dev);
 275
 276         platform_device_unregister(pdev);
 277         clk_unregister(spi_pdata->ssp.clk);
 278 }
 279
 280 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
 281         { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
 282         { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
 283         { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
 284         { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
 285         { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
 286         { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
 287         { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
 288         { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
 289         { },
 290 };
 291 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 292
 293 static struct pci_driver pxa2xx_spi_pci_driver = {
 294         .name           = "pxa2xx_spi_pci",
 295         .id_table       = pxa2xx_spi_pci_devices,
 296         .probe          = pxa2xx_spi_pci_probe,
 297         .remove         = pxa2xx_spi_pci_remove,
 298 };
 299
 300 module_pci_driver(pxa2xx_spi_pci_driver);
 301
 302 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 303 MODULE_LICENSE("GPL v2");
 304 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");