1 // SPDX-License-Identifier: GPL-2.0-only
3 * CE4100's SPI device is more or less the same one as found on PXA
5 * Copyright (C) 2016, Intel Corporation
7 #include <linux/clk-provider.h>
8 #include <linux/module.h>
10 #include <linux/platform_device.h>
11 #include <linux/spi/pxa2xx_spi.h>
13 #include <linux/dmaengine.h>
14 #include <linux/platform_data/dma-dw.h>
29 enum pxa_ssp_type type;
32 unsigned long max_clk_rate;
34 /* DMA channel request parameters */
35 bool (*dma_filter)(struct dma_chan *chan, void *param);
41 int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
44 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
45 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
47 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
48 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
49 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
50 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
51 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
52 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
54 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
55 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
56 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
57 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
58 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
59 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
61 static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
62 static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
63 static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
64 static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
66 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
68 struct dw_dma_slave *dws = param;
70 if (dws->dma_dev != chan->device->dev)
77 static void lpss_dma_put_device(void *dma_dev)
82 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
84 struct pci_dev *dma_dev;
87 c->num_chipselect = 1;
88 c->max_clk_rate = 50000000;
90 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
91 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
96 struct dw_dma_slave *slave = c->tx_param;
98 slave->dma_dev = &dma_dev->dev;
104 struct dw_dma_slave *slave = c->rx_param;
106 slave->dma_dev = &dma_dev->dev;
111 c->dma_filter = lpss_dma_filter;
115 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
117 struct dw_dma_slave *tx, *rx;
118 struct pci_dev *dma_dev;
121 switch (PCI_FUNC(dev->devfn)) {
124 c->num_chipselect = 1;
125 c->tx_param = &mrfld3_tx_param;
126 c->rx_param = &mrfld3_rx_param;
130 c->num_chipselect = 4;
131 c->tx_param = &mrfld5_tx_param;
132 c->rx_param = &mrfld5_rx_param;
136 c->num_chipselect = 1;
137 c->tx_param = &mrfld6_tx_param;
138 c->rx_param = &mrfld6_rx_param;
144 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
145 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
150 tx->dma_dev = &dma_dev->dev;
153 rx->dma_dev = &dma_dev->dev;
155 c->dma_filter = lpss_dma_filter;
156 c->dma_burst_size = 8;
160 static struct pxa_spi_info spi_info_configs[] = {
164 .num_chipselect = -1,
165 .max_clk_rate = 3686400,
168 .type = LPSS_BYT_SSP,
170 .setup = lpss_spi_setup,
171 .tx_param = &byt_tx_param,
172 .rx_param = &byt_rx_param,
175 .type = LPSS_BSW_SSP,
177 .setup = lpss_spi_setup,
178 .tx_param = &bsw0_tx_param,
179 .rx_param = &bsw0_rx_param,
182 .type = LPSS_BSW_SSP,
184 .setup = lpss_spi_setup,
185 .tx_param = &bsw1_tx_param,
186 .rx_param = &bsw1_rx_param,
189 .type = LPSS_BSW_SSP,
191 .setup = lpss_spi_setup,
192 .tx_param = &bsw2_tx_param,
193 .rx_param = &bsw2_rx_param,
197 .max_clk_rate = 25000000,
198 .setup = mrfld_spi_setup,
200 [PORT_QUARK_X1000] = {
201 .type = QUARK_X1000_SSP,
204 .max_clk_rate = 50000000,
207 .type = LPSS_LPT_SSP,
209 .setup = lpss_spi_setup,
210 .tx_param = &lpt0_tx_param,
211 .rx_param = &lpt0_rx_param,
214 .type = LPSS_LPT_SSP,
216 .setup = lpss_spi_setup,
217 .tx_param = &lpt1_tx_param,
218 .rx_param = &lpt1_rx_param,
222 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
223 const struct pci_device_id *ent)
225 struct platform_device_info pi;
227 struct platform_device *pdev;
228 struct pxa2xx_spi_controller spi_pdata;
229 struct ssp_device *ssp;
230 struct pxa_spi_info *c;
233 ret = pcim_enable_device(dev);
237 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
241 c = &spi_info_configs[ent->driver_data];
243 ret = c->setup(dev, c);
248 memset(&spi_pdata, 0, sizeof(spi_pdata));
249 spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
250 spi_pdata.dma_filter = c->dma_filter;
251 spi_pdata.tx_param = c->tx_param;
252 spi_pdata.rx_param = c->rx_param;
253 spi_pdata.enable_dma = c->rx_param && c->tx_param;
254 spi_pdata.dma_burst_size = c->dma_burst_size ? c->dma_burst_size : 1;
256 ssp = &spi_pdata.ssp;
257 ssp->phys_base = pci_resource_start(dev, 0);
258 ssp->mmio_base = pcim_iomap_table(dev)[0];
259 ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
264 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
267 ssp->irq = pci_irq_vector(dev, 0);
269 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
270 ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
272 if (IS_ERR(ssp->clk))
273 return PTR_ERR(ssp->clk);
275 memset(&pi, 0, sizeof(pi));
276 pi.fwnode = dev->dev.fwnode;
277 pi.parent = &dev->dev;
278 pi.name = "pxa2xx-spi";
279 pi.id = ssp->port_id;
280 pi.data = &spi_pdata;
281 pi.size_data = sizeof(spi_pdata);
283 pdev = platform_device_register_full(&pi);
285 clk_unregister(ssp->clk);
286 return PTR_ERR(pdev);
289 pci_set_drvdata(dev, pdev);
294 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
296 struct platform_device *pdev = pci_get_drvdata(dev);
297 struct pxa2xx_spi_controller *spi_pdata;
299 spi_pdata = dev_get_platdata(&pdev->dev);
301 platform_device_unregister(pdev);
302 clk_unregister(spi_pdata->ssp.clk);
305 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
306 { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
307 { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
308 { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
309 { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
310 { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
311 { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
312 { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
313 { PCI_VDEVICE(INTEL, 0x9ce5), PORT_LPT0 },
314 { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT1 },
317 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
319 static struct pci_driver pxa2xx_spi_pci_driver = {
320 .name = "pxa2xx_spi_pci",
321 .id_table = pxa2xx_spi_pci_devices,
322 .probe = pxa2xx_spi_pci_probe,
323 .remove = pxa2xx_spi_pci_remove,
326 module_pci_driver(pxa2xx_spi_pci_driver);
328 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
329 MODULE_LICENSE("GPL v2");
330 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");