1 // SPDX-License-Identifier: GPL-2.0-only
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.
6 * Copyright (C) 2016, 2021 Intel Corporation
8 #include <linux/clk-provider.h>
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/platform_device.h>
13 #include <linux/spi/pxa2xx_spi.h>
15 #include <linux/dmaengine.h>
16 #include <linux/platform_data/dma-dw.h>
31 enum pxa_ssp_type type;
34 unsigned long max_clk_rate;
36 /* DMA channel request parameters */
37 bool (*dma_filter)(struct dma_chan *chan, void *param);
43 int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
46 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
47 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
49 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
50 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
51 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
52 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
53 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
54 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
56 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
57 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
58 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
59 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
60 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
61 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
63 static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
64 static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
65 static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
66 static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
68 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
70 struct dw_dma_slave *dws = param;
72 if (dws->dma_dev != chan->device->dev)
79 static void lpss_dma_put_device(void *dma_dev)
84 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
86 struct pci_dev *dma_dev;
89 c->num_chipselect = 1;
90 c->max_clk_rate = 50000000;
92 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
93 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
98 struct dw_dma_slave *slave = c->tx_param;
100 slave->dma_dev = &dma_dev->dev;
106 struct dw_dma_slave *slave = c->rx_param;
108 slave->dma_dev = &dma_dev->dev;
113 c->dma_filter = lpss_dma_filter;
117 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
119 struct dw_dma_slave *tx, *rx;
120 struct pci_dev *dma_dev;
123 switch (PCI_FUNC(dev->devfn)) {
126 c->num_chipselect = 1;
127 c->tx_param = &mrfld3_tx_param;
128 c->rx_param = &mrfld3_rx_param;
132 c->num_chipselect = 4;
133 c->tx_param = &mrfld5_tx_param;
134 c->rx_param = &mrfld5_rx_param;
138 c->num_chipselect = 1;
139 c->tx_param = &mrfld6_tx_param;
140 c->rx_param = &mrfld6_rx_param;
146 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
147 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
152 tx->dma_dev = &dma_dev->dev;
155 rx->dma_dev = &dma_dev->dev;
157 c->dma_filter = lpss_dma_filter;
158 c->dma_burst_size = 8;
162 static struct pxa_spi_info spi_info_configs[] = {
166 .num_chipselect = -1,
167 .max_clk_rate = 3686400,
170 .type = LPSS_BYT_SSP,
172 .setup = lpss_spi_setup,
173 .tx_param = &byt_tx_param,
174 .rx_param = &byt_rx_param,
177 .type = LPSS_BSW_SSP,
179 .setup = lpss_spi_setup,
180 .tx_param = &bsw0_tx_param,
181 .rx_param = &bsw0_rx_param,
184 .type = LPSS_BSW_SSP,
186 .setup = lpss_spi_setup,
187 .tx_param = &bsw1_tx_param,
188 .rx_param = &bsw1_rx_param,
191 .type = LPSS_BSW_SSP,
193 .setup = lpss_spi_setup,
194 .tx_param = &bsw2_tx_param,
195 .rx_param = &bsw2_rx_param,
199 .max_clk_rate = 25000000,
200 .setup = mrfld_spi_setup,
202 [PORT_QUARK_X1000] = {
203 .type = QUARK_X1000_SSP,
206 .max_clk_rate = 50000000,
209 .type = LPSS_LPT_SSP,
211 .setup = lpss_spi_setup,
212 .tx_param = &lpt0_tx_param,
213 .rx_param = &lpt0_rx_param,
216 .type = LPSS_LPT_SSP,
218 .setup = lpss_spi_setup,
219 .tx_param = &lpt1_tx_param,
220 .rx_param = &lpt1_rx_param,
224 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
225 const struct pci_device_id *ent)
227 struct platform_device_info pi;
229 struct platform_device *pdev;
230 struct pxa2xx_spi_controller spi_pdata;
231 struct ssp_device *ssp;
232 struct pxa_spi_info *c;
235 ret = pcim_enable_device(dev);
239 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
243 c = &spi_info_configs[ent->driver_data];
245 ret = c->setup(dev, c);
250 memset(&spi_pdata, 0, sizeof(spi_pdata));
251 spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
252 spi_pdata.dma_filter = c->dma_filter;
253 spi_pdata.tx_param = c->tx_param;
254 spi_pdata.rx_param = c->rx_param;
255 spi_pdata.enable_dma = c->rx_param && c->tx_param;
256 spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1;
258 ssp = &spi_pdata.ssp;
259 ssp->dev = &dev->dev;
260 ssp->phys_base = pci_resource_start(dev, 0);
261 ssp->mmio_base = pcim_iomap_table(dev)[0];
262 ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
267 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
270 ssp->irq = pci_irq_vector(dev, 0);
272 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
273 ssp->clk = clk_register_fixed_rate(&dev->dev, buf, NULL, 0,
275 if (IS_ERR(ssp->clk))
276 return PTR_ERR(ssp->clk);
278 memset(&pi, 0, sizeof(pi));
279 pi.fwnode = dev->dev.fwnode;
280 pi.parent = &dev->dev;
281 pi.name = "pxa2xx-spi";
282 pi.id = ssp->port_id;
283 pi.data = &spi_pdata;
284 pi.size_data = sizeof(spi_pdata);
286 pdev = platform_device_register_full(&pi);
288 clk_unregister(ssp->clk);
289 return PTR_ERR(pdev);
292 pci_set_drvdata(dev, pdev);
297 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
299 struct platform_device *pdev = pci_get_drvdata(dev);
300 struct pxa2xx_spi_controller *spi_pdata;
302 spi_pdata = dev_get_platdata(&pdev->dev);
304 platform_device_unregister(pdev);
305 clk_unregister(spi_pdata->ssp.clk);
308 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
309 { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
310 { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
311 { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
312 { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
313 { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
314 { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
315 { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
316 { PCI_VDEVICE(INTEL, 0x9c65), PORT_LPT0 },
317 { PCI_VDEVICE(INTEL, 0x9c66), PORT_LPT1 },
318 { PCI_VDEVICE(INTEL, 0x9ce5), PORT_LPT0 },
319 { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT1 },
322 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
324 static struct pci_driver pxa2xx_spi_pci_driver = {
325 .name = "pxa2xx_spi_pci",
326 .id_table = pxa2xx_spi_pci_devices,
327 .probe = pxa2xx_spi_pci_probe,
328 .remove = pxa2xx_spi_pci_remove,
331 module_pci_driver(pxa2xx_spi_pci_driver);
333 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
334 MODULE_LICENSE("GPL v2");
335 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");