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/module.h> 10#include <linux/pci.h> 11#include <linux/platform_device.h> 12 13#include <linux/spi/pxa2xx_spi.h> 14 15#include <linux/dmaengine.h> 16#include <linux/platform_data/dma-dw.h> 17 18#define PCI_DEVICE_ID_INTEL_QUARK_X1000 0x0935 19#define PCI_DEVICE_ID_INTEL_BYT 0x0f0e 20#define PCI_DEVICE_ID_INTEL_MRFLD 0x1194 21#define PCI_DEVICE_ID_INTEL_BSW0 0x228e 22#define PCI_DEVICE_ID_INTEL_BSW1 0x2290 23#define PCI_DEVICE_ID_INTEL_BSW2 0x22ac 24#define PCI_DEVICE_ID_INTEL_CE4100 0x2e6a 25#define PCI_DEVICE_ID_INTEL_LPT0_0 0x9c65 26#define PCI_DEVICE_ID_INTEL_LPT0_1 0x9c66 27#define PCI_DEVICE_ID_INTEL_LPT1_0 0x9ce5 28#define PCI_DEVICE_ID_INTEL_LPT1_1 0x9ce6 29 30struct pxa_spi_info { 31 int (*setup)(struct pci_dev *pdev, struct pxa2xx_spi_controller *c); 32}; 33 34static struct dw_dma_slave byt_tx_param = { .dst_id = 0 }; 35static struct dw_dma_slave byt_rx_param = { .src_id = 1 }; 36 37static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 }; 38static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 }; 39static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 }; 40static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 }; 41static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 }; 42static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 }; 43 44static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 }; 45static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 }; 46static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 }; 47static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 }; 48static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 }; 49static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 }; 50 51static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 }; 52static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 }; 53static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 }; 54static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 }; 55 56static void pxa2xx_spi_pci_clk_unregister(void *clk) 57{ 58 clk_unregister(clk); 59} 60 61static int pxa2xx_spi_pci_clk_register(struct pci_dev *dev, struct ssp_device *ssp, 62 unsigned long rate) 63{ 64 char buf[40]; 65 66 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id); 67 ssp->clk = clk_register_fixed_rate(&dev->dev, buf, NULL, 0, rate); 68 if (IS_ERR(ssp->clk)) 69 return PTR_ERR(ssp->clk); 70 71 return devm_add_action_or_reset(&dev->dev, pxa2xx_spi_pci_clk_unregister, ssp->clk); 72} 73 74static bool lpss_dma_filter(struct dma_chan *chan, void *param) 75{ 76 struct dw_dma_slave *dws = param; 77 78 if (dws->dma_dev != chan->device->dev) 79 return false; 80 81 chan->private = dws; 82 return true; 83} 84 85static void lpss_dma_put_device(void *dma_dev) 86{ 87 pci_dev_put(dma_dev); 88} 89 90static int lpss_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c) 91{ 92 struct ssp_device *ssp = &c->ssp; 93 struct dw_dma_slave *tx, *rx; 94 struct pci_dev *dma_dev; 95 int ret; 96 97 switch (dev->device) { 98 case PCI_DEVICE_ID_INTEL_BYT: 99 ssp->type = LPSS_BYT_SSP; 100 ssp->port_id = 0; 101 c->tx_param = &byt_tx_param; 102 c->rx_param = &byt_rx_param; 103 break; 104 case PCI_DEVICE_ID_INTEL_BSW0: 105 ssp->type = LPSS_BSW_SSP; 106 ssp->port_id = 0; 107 c->tx_param = &bsw0_tx_param; 108 c->rx_param = &bsw0_rx_param; 109 break; 110 case PCI_DEVICE_ID_INTEL_BSW1: 111 ssp->type = LPSS_BSW_SSP; 112 ssp->port_id = 1; 113 c->tx_param = &bsw1_tx_param; 114 c->rx_param = &bsw1_rx_param; 115 break; 116 case PCI_DEVICE_ID_INTEL_BSW2: 117 ssp->type = LPSS_BSW_SSP; 118 ssp->port_id = 2; 119 c->tx_param = &bsw2_tx_param; 120 c->rx_param = &bsw2_rx_param; 121 break; 122 case PCI_DEVICE_ID_INTEL_LPT0_0: 123 case PCI_DEVICE_ID_INTEL_LPT1_0: 124 ssp->type = LPSS_LPT_SSP; 125 ssp->port_id = 0; 126 c->tx_param = &lpt0_tx_param; 127 c->rx_param = &lpt0_rx_param; 128 break; 129 case PCI_DEVICE_ID_INTEL_LPT0_1: 130 case PCI_DEVICE_ID_INTEL_LPT1_1: 131 ssp->type = LPSS_LPT_SSP; 132 ssp->port_id = 1; 133 c->tx_param = &lpt1_tx_param; 134 c->rx_param = &lpt1_rx_param; 135 break; 136 default: 137 return -ENODEV; 138 } 139 140 c->num_chipselect = 1; 141 142 ret = pxa2xx_spi_pci_clk_register(dev, ssp, 50000000); 143 if (ret) 144 return ret; 145 146 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); 147 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev); 148 if (ret) 149 return ret; 150 151 tx = c->tx_param; 152 tx->dma_dev = &dma_dev->dev; 153 tx->m_master = 0; 154 tx->p_master = 1; 155 156 rx = c->rx_param; 157 rx->dma_dev = &dma_dev->dev; 158 rx->m_master = 0; 159 rx->p_master = 1; 160 161 c->dma_filter = lpss_dma_filter; 162 c->dma_burst_size = 1; 163 c->enable_dma = 1; 164 return 0; 165} 166 167static const struct pxa_spi_info lpss_info_config = { 168 .setup = lpss_spi_setup, 169}; 170 171static int ce4100_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c) 172{ 173 struct ssp_device *ssp = &c->ssp; 174 175 ssp->type = PXA25x_SSP; 176 ssp->port_id = dev->devfn; 177 c->num_chipselect = dev->devfn; 178 179 return pxa2xx_spi_pci_clk_register(dev, ssp, 3686400); 180} 181 182static const struct pxa_spi_info ce4100_info_config = { 183 .setup = ce4100_spi_setup, 184}; 185 186static int mrfld_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c) 187{ 188 struct ssp_device *ssp = &c->ssp; 189 struct dw_dma_slave *tx, *rx; 190 struct pci_dev *dma_dev; 191 int ret; 192 193 ssp->type = MRFLD_SSP; 194 195 switch (PCI_FUNC(dev->devfn)) { 196 case 0: 197 ssp->port_id = 3; 198 c->num_chipselect = 1; 199 c->tx_param = &mrfld3_tx_param; 200 c->rx_param = &mrfld3_rx_param; 201 break; 202 case 1: 203 ssp->port_id = 5; 204 c->num_chipselect = 4; 205 c->tx_param = &mrfld5_tx_param; 206 c->rx_param = &mrfld5_rx_param; 207 break; 208 case 2: 209 ssp->port_id = 6; 210 c->num_chipselect = 1; 211 c->tx_param = &mrfld6_tx_param; 212 c->rx_param = &mrfld6_rx_param; 213 break; 214 default: 215 return -ENODEV; 216 } 217 218 ret = pxa2xx_spi_pci_clk_register(dev, ssp, 25000000); 219 if (ret) 220 return ret; 221 222 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0)); 223 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev); 224 if (ret) 225 return ret; 226 227 tx = c->tx_param; 228 tx->dma_dev = &dma_dev->dev; 229 230 rx = c->rx_param; 231 rx->dma_dev = &dma_dev->dev; 232 233 c->dma_filter = lpss_dma_filter; 234 c->dma_burst_size = 8; 235 c->enable_dma = 1; 236 return 0; 237} 238 239static const struct pxa_spi_info mrfld_info_config = { 240 .setup = mrfld_spi_setup, 241}; 242 243static int qrk_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c) 244{ 245 struct ssp_device *ssp = &c->ssp; 246 247 ssp->type = QUARK_X1000_SSP; 248 ssp->port_id = dev->devfn; 249 c->num_chipselect = 1; 250 251 return pxa2xx_spi_pci_clk_register(dev, ssp, 50000000); 252} 253 254static const struct pxa_spi_info qrk_info_config = { 255 .setup = qrk_spi_setup, 256}; 257 258static int pxa2xx_spi_pci_probe(struct pci_dev *dev, 259 const struct pci_device_id *ent) 260{ 261 const struct pxa_spi_info *info; 262 struct platform_device_info pi; 263 int ret; 264 struct platform_device *pdev; 265 struct pxa2xx_spi_controller spi_pdata; 266 struct ssp_device *ssp; 267 268 ret = pcim_enable_device(dev); 269 if (ret) 270 return ret; 271 272 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI"); 273 if (ret) 274 return ret; 275 276 memset(&spi_pdata, 0, sizeof(spi_pdata)); 277 278 ssp = &spi_pdata.ssp; 279 ssp->dev = &dev->dev; 280 ssp->phys_base = pci_resource_start(dev, 0); 281 ssp->mmio_base = pcim_iomap_table(dev)[0]; 282 283 info = (struct pxa_spi_info *)ent->driver_data; 284 ret = info->setup(dev, &spi_pdata); 285 if (ret) 286 return ret; 287 288 pci_set_master(dev); 289 290 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES); 291 if (ret < 0) 292 return ret; 293 ssp->irq = pci_irq_vector(dev, 0); 294 295 memset(&pi, 0, sizeof(pi)); 296 pi.fwnode = dev_fwnode(&dev->dev); 297 pi.parent = &dev->dev; 298 pi.name = "pxa2xx-spi"; 299 pi.id = ssp->port_id; 300 pi.data = &spi_pdata; 301 pi.size_data = sizeof(spi_pdata); 302 303 pdev = platform_device_register_full(&pi); 304 if (IS_ERR(pdev)) 305 return PTR_ERR(pdev); 306 307 pci_set_drvdata(dev, pdev); 308 309 return 0; 310} 311 312static void pxa2xx_spi_pci_remove(struct pci_dev *dev) 313{ 314 struct platform_device *pdev = pci_get_drvdata(dev); 315 316 platform_device_unregister(pdev); 317} 318 319static 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}; 333MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices); 334 335static struct pci_driver pxa2xx_spi_pci_driver = { 336 .name = "pxa2xx_spi_pci", 337 .id_table = pxa2xx_spi_pci_devices, 338 .probe = pxa2xx_spi_pci_probe, 339 .remove = pxa2xx_spi_pci_remove, 340}; 341 342module_pci_driver(pxa2xx_spi_pci_driver); 343 344MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver"); 345MODULE_LICENSE("GPL v2"); 346MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); 347