drivers/spi/spi-pxa2xx-pci.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * PCI glue driver for SPI PXA2xx compatible controllers.
   4  * CE4100's SPI device is more or less the same one as found on PXA.
   5  *
   6  * Copyright (C) 2016, 2021 Intel Corporation
   7  */
   8 #include <linux/clk-provider.h>
   9 #include <linux/device.h>
  10 #include <linux/err.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/pm.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/sprintf.h>
  16 #include <linux/string.h>
  17 #include <linux/types.h>
  18
  19 #include <linux/dmaengine.h>
  20 #include <linux/platform_data/dma-dw.h>
  21
  22 #include "spi-pxa2xx.h"
  23
  24 #define PCI_DEVICE_ID_INTEL_QUARK_X1000         0x0935
  25 #define PCI_DEVICE_ID_INTEL_BYT                 0x0f0e
  26 #define PCI_DEVICE_ID_INTEL_MRFLD               0x1194
  27 #define PCI_DEVICE_ID_INTEL_BSW0                0x228e
  28 #define PCI_DEVICE_ID_INTEL_BSW1                0x2290
  29 #define PCI_DEVICE_ID_INTEL_BSW2                0x22ac
  30 #define PCI_DEVICE_ID_INTEL_CE4100              0x2e6a
  31 #define PCI_DEVICE_ID_INTEL_LPT0_0              0x9c65
  32 #define PCI_DEVICE_ID_INTEL_LPT0_1              0x9c66
  33 #define PCI_DEVICE_ID_INTEL_LPT1_0              0x9ce5
  34 #define PCI_DEVICE_ID_INTEL_LPT1_1              0x9ce6
  35
  36 struct pxa_spi_info {
  37         int (*setup)(struct pci_dev *pdev, struct pxa2xx_spi_controller *c);
  38 };
  39
  40 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
  41 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
  42
  43 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
  44 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
  45 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
  46 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
  47 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
  48 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
  49
  50 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
  51 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
  52 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
  53 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
  54 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
  55 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
  56
  57 static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
  58 static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
  59 static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
  60 static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
  61
  62 static void pxa2xx_spi_pci_clk_unregister(void *clk)
  63 {
  64         clk_unregister(clk);
  65 }
  66
  67 static int pxa2xx_spi_pci_clk_register(struct pci_dev *dev, struct ssp_device *ssp,
  68                                        unsigned long rate)
  69 {
  70         char buf[40];
  71
  72         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
  73         ssp->clk = clk_register_fixed_rate(&dev->dev, buf, NULL, 0, rate);
  74         if (IS_ERR(ssp->clk))
  75                 return PTR_ERR(ssp->clk);
  76
  77         return devm_add_action_or_reset(&dev->dev, pxa2xx_spi_pci_clk_unregister, ssp->clk);
  78 }
  79
  80 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
  81 {
  82         struct dw_dma_slave *dws = param;
  83
  84         if (dws->dma_dev != chan->device->dev)
  85                 return false;
  86
  87         chan->private = dws;
  88         return true;
  89 }
  90
  91 static void lpss_dma_put_device(void *dma_dev)
  92 {
  93         pci_dev_put(dma_dev);
  94 }
  95
  96 static int lpss_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
  97 {
  98         struct ssp_device *ssp = &c->ssp;
  99         struct dw_dma_slave *tx, *rx;
 100         struct pci_dev *dma_dev;
 101         int ret;
 102
 103         switch (dev->device) {
 104         case PCI_DEVICE_ID_INTEL_BYT:
 105                 ssp->type = LPSS_BYT_SSP;
 106                 ssp->port_id = 0;
 107                 c->tx_param = &byt_tx_param;
 108                 c->rx_param = &byt_rx_param;
 109                 break;
 110         case PCI_DEVICE_ID_INTEL_BSW0:
 111                 ssp->type = LPSS_BSW_SSP;
 112                 ssp->port_id = 0;
 113                 c->tx_param = &bsw0_tx_param;
 114                 c->rx_param = &bsw0_rx_param;
 115                 break;
 116         case PCI_DEVICE_ID_INTEL_BSW1:
 117                 ssp->type = LPSS_BSW_SSP;
 118                 ssp->port_id = 1;
 119                 c->tx_param = &bsw1_tx_param;
 120                 c->rx_param = &bsw1_rx_param;
 121                 break;
 122         case PCI_DEVICE_ID_INTEL_BSW2:
 123                 ssp->type = LPSS_BSW_SSP;
 124                 ssp->port_id = 2;
 125                 c->tx_param = &bsw2_tx_param;
 126                 c->rx_param = &bsw2_rx_param;
 127                 break;
 128         case PCI_DEVICE_ID_INTEL_LPT0_0:
 129         case PCI_DEVICE_ID_INTEL_LPT1_0:
 130                 ssp->type = LPSS_LPT_SSP;
 131                 ssp->port_id = 0;
 132                 c->tx_param = &lpt0_tx_param;
 133                 c->rx_param = &lpt0_rx_param;
 134                 break;
 135         case PCI_DEVICE_ID_INTEL_LPT0_1:
 136         case PCI_DEVICE_ID_INTEL_LPT1_1:
 137                 ssp->type = LPSS_LPT_SSP;
 138                 ssp->port_id = 1;
 139                 c->tx_param = &lpt1_tx_param;
 140                 c->rx_param = &lpt1_rx_param;
 141                 break;
 142         default:
 143                 return -ENODEV;
 144         }
 145
 146         c->num_chipselect = 1;
 147
 148         ret = pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
 149         if (ret)
 150                 return ret;
 151
 152         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
 153         ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
 154         if (ret)
 155                 return ret;
 156
 157         tx = c->tx_param;
 158         tx->dma_dev = &dma_dev->dev;
 159         tx->m_master = 0;
 160         tx->p_master = 1;
 161
 162         rx = c->rx_param;
 163         rx->dma_dev = &dma_dev->dev;
 164         rx->m_master = 0;
 165         rx->p_master = 1;
 166
 167         c->dma_filter = lpss_dma_filter;
 168         c->dma_burst_size = 1;
 169         c->enable_dma = 1;
 170         return 0;
 171 }
 172
 173 static const struct pxa_spi_info lpss_info_config = {
 174         .setup = lpss_spi_setup,
 175 };
 176
 177 static int ce4100_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
 178 {
 179         struct ssp_device *ssp = &c->ssp;
 180
 181         ssp->type = PXA25x_SSP;
 182         ssp->port_id = dev->devfn;
 183         c->num_chipselect = dev->devfn;
 184
 185         return pxa2xx_spi_pci_clk_register(dev, ssp, 3686400);
 186 }
 187
 188 static const struct pxa_spi_info ce4100_info_config = {
 189         .setup = ce4100_spi_setup,
 190 };
 191
 192 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
 193 {
 194         struct ssp_device *ssp = &c->ssp;
 195         struct dw_dma_slave *tx, *rx;
 196         struct pci_dev *dma_dev;
 197         int ret;
 198
 199         ssp->type = MRFLD_SSP;
 200
 201         switch (PCI_FUNC(dev->devfn)) {
 202         case 0:
 203                 ssp->port_id = 3;
 204                 c->num_chipselect = 1;
 205                 c->tx_param = &mrfld3_tx_param;
 206                 c->rx_param = &mrfld3_rx_param;
 207                 break;
 208         case 1:
 209                 ssp->port_id = 5;
 210                 c->num_chipselect = 4;
 211                 c->tx_param = &mrfld5_tx_param;
 212                 c->rx_param = &mrfld5_rx_param;
 213                 break;
 214         case 2:
 215                 ssp->port_id = 6;
 216                 c->num_chipselect = 1;
 217                 c->tx_param = &mrfld6_tx_param;
 218                 c->rx_param = &mrfld6_rx_param;
 219                 break;
 220         default:
 221                 return -ENODEV;
 222         }
 223
 224         ret = pxa2xx_spi_pci_clk_register(dev, ssp, 25000000);
 225         if (ret)
 226                 return ret;
 227
 228         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
 229         ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
 230         if (ret)
 231                 return ret;
 232
 233         tx = c->tx_param;
 234         tx->dma_dev = &dma_dev->dev;
 235
 236         rx = c->rx_param;
 237         rx->dma_dev = &dma_dev->dev;
 238
 239         c->dma_filter = lpss_dma_filter;
 240         c->dma_burst_size = 8;
 241         c->enable_dma = 1;
 242         return 0;
 243 }
 244
 245 static const struct pxa_spi_info mrfld_info_config = {
 246         .setup = mrfld_spi_setup,
 247 };
 248
 249 static int qrk_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
 250 {
 251         struct ssp_device *ssp = &c->ssp;
 252
 253         ssp->type = QUARK_X1000_SSP;
 254         ssp->port_id = dev->devfn;
 255         c->num_chipselect = 1;
 256
 257         return pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
 258 }
 259
 260 static const struct pxa_spi_info qrk_info_config = {
 261         .setup = qrk_spi_setup,
 262 };
 263
 264 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 265                 const struct pci_device_id *ent)
 266 {
 267         const struct pxa_spi_info *info;
 268         int ret;
 269         struct pxa2xx_spi_controller *pdata;
 270         struct ssp_device *ssp;
 271
 272         ret = pcim_enable_device(dev);
 273         if (ret)
 274                 return ret;
 275
 276         pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
 277         if (!pdata)
 278                 return -ENOMEM;
 279
 280         ssp = &pdata->ssp;
 281         ssp->dev = &dev->dev;
 282         ssp->phys_base = pci_resource_start(dev, 0);
 283         ssp->mmio_base = pcim_iomap_region(dev, 0, "PXA2xx SPI");
 284         if (IS_ERR(ssp->mmio_base))
 285                 return PTR_ERR(ssp->mmio_base);
 286
 287         info = (struct pxa_spi_info *)ent->driver_data;
 288         ret = info->setup(dev, pdata);
 289         if (ret)
 290                 return ret;
 291
 292         pci_set_master(dev);
 293
 294         ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
 295         if (ret < 0)
 296                 return ret;
 297         ssp->irq = pci_irq_vector(dev, 0);
 298
 299         ret = pxa2xx_spi_probe(&dev->dev, ssp, pdata);
 300         if (ret)
 301                 return ret;
 302
 303         pm_runtime_set_autosuspend_delay(&dev->dev, 50);
 304         pm_runtime_use_autosuspend(&dev->dev);
 305         pm_runtime_put_autosuspend(&dev->dev);
 306         pm_runtime_allow(&dev->dev);
 307
 308         return 0;
 309 }
 310
 311 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 312 {
 313         pm_runtime_forbid(&dev->dev);
 314         pm_runtime_get_noresume(&dev->dev);
 315
 316         pxa2xx_spi_remove(&dev->dev);
 317 }
 318
 319 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
 320         { PCI_DEVICE_DATA(INTEL, QUARK_X1000, &qrk_info_config) },
 321         { PCI_DEVICE_DATA(INTEL, BYT, &lpss_info_config) },
 322         { PCI_DEVICE_DATA(INTEL, MRFLD, &mrfld_info_config) },
 323         { PCI_DEVICE_DATA(INTEL, BSW0, &lpss_info_config) },
 324         { PCI_DEVICE_DATA(INTEL, BSW1, &lpss_info_config) },
 325         { PCI_DEVICE_DATA(INTEL, BSW2, &lpss_info_config) },
 326         { PCI_DEVICE_DATA(INTEL, CE4100, &ce4100_info_config) },
 327         { PCI_DEVICE_DATA(INTEL, LPT0_0, &lpss_info_config) },
 328         { PCI_DEVICE_DATA(INTEL, LPT0_1, &lpss_info_config) },
 329         { PCI_DEVICE_DATA(INTEL, LPT1_0, &lpss_info_config) },
 330         { PCI_DEVICE_DATA(INTEL, LPT1_1, &lpss_info_config) },
 331         { }
 332 };
 333 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 334
 335 static struct pci_driver pxa2xx_spi_pci_driver = {
 336         .name           = "pxa2xx_spi_pci",
 337         .id_table       = pxa2xx_spi_pci_devices,
 338         .driver = {
 339                 .pm     = pm_ptr(&pxa2xx_spi_pm_ops),
 340         },
 341         .probe          = pxa2xx_spi_pci_probe,
 342         .remove         = pxa2xx_spi_pci_remove,
 343 };
 344
 345 module_pci_driver(pxa2xx_spi_pci_driver);
 346
 347 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 348 MODULE_LICENSE("GPL v2");
 349 MODULE_IMPORT_NS("SPI_PXA2xx");
 350 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");