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>
28 enum pxa_ssp_type type;
31 unsigned long max_clk_rate;
33 /* DMA channel request parameters */
34 bool (*dma_filter)(struct dma_chan *chan, void *param);
40 int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
43 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
44 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
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 };
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 };
60 static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
61 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
63 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
65 struct dw_dma_slave *dws = param;
67 if (dws->dma_dev != chan->device->dev)
74 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
76 struct pci_dev *dma_dev;
78 c->num_chipselect = 1;
79 c->max_clk_rate = 50000000;
81 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
84 struct dw_dma_slave *slave = c->tx_param;
86 slave->dma_dev = &dma_dev->dev;
92 struct dw_dma_slave *slave = c->rx_param;
94 slave->dma_dev = &dma_dev->dev;
99 c->dma_filter = lpss_dma_filter;
103 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
105 struct pci_dev *dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
106 struct dw_dma_slave *tx, *rx;
108 switch (PCI_FUNC(dev->devfn)) {
111 c->num_chipselect = 1;
112 c->tx_param = &mrfld3_tx_param;
113 c->rx_param = &mrfld3_rx_param;
117 c->num_chipselect = 4;
118 c->tx_param = &mrfld5_tx_param;
119 c->rx_param = &mrfld5_rx_param;
123 c->num_chipselect = 1;
124 c->tx_param = &mrfld6_tx_param;
125 c->rx_param = &mrfld6_rx_param;
132 tx->dma_dev = &dma_dev->dev;
135 rx->dma_dev = &dma_dev->dev;
137 c->dma_filter = lpss_dma_filter;
138 c->dma_burst_size = 8;
142 static struct pxa_spi_info spi_info_configs[] = {
146 .num_chipselect = -1,
147 .max_clk_rate = 3686400,
150 .type = LPSS_BYT_SSP,
152 .setup = lpss_spi_setup,
153 .tx_param = &byt_tx_param,
154 .rx_param = &byt_rx_param,
157 .type = LPSS_BSW_SSP,
159 .setup = lpss_spi_setup,
160 .tx_param = &bsw0_tx_param,
161 .rx_param = &bsw0_rx_param,
164 .type = LPSS_BSW_SSP,
166 .setup = lpss_spi_setup,
167 .tx_param = &bsw1_tx_param,
168 .rx_param = &bsw1_rx_param,
171 .type = LPSS_BSW_SSP,
173 .setup = lpss_spi_setup,
174 .tx_param = &bsw2_tx_param,
175 .rx_param = &bsw2_rx_param,
179 .max_clk_rate = 25000000,
180 .setup = mrfld_spi_setup,
182 [PORT_QUARK_X1000] = {
183 .type = QUARK_X1000_SSP,
186 .max_clk_rate = 50000000,
189 .type = LPSS_LPT_SSP,
191 .setup = lpss_spi_setup,
192 .tx_param = &lpt_tx_param,
193 .rx_param = &lpt_rx_param,
197 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
198 const struct pci_device_id *ent)
200 struct platform_device_info pi;
202 struct platform_device *pdev;
203 struct pxa2xx_spi_controller spi_pdata;
204 struct ssp_device *ssp;
205 struct pxa_spi_info *c;
208 ret = pcim_enable_device(dev);
212 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
216 c = &spi_info_configs[ent->driver_data];
218 ret = c->setup(dev, c);
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;
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;
239 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
242 ssp->irq = pci_irq_vector(dev, 0);
244 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
245 ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
247 if (IS_ERR(ssp->clk))
248 return PTR_ERR(ssp->clk);
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);
258 pdev = platform_device_register_full(&pi);
260 clk_unregister(ssp->clk);
261 return PTR_ERR(pdev);
264 pci_set_drvdata(dev, pdev);
269 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
271 struct platform_device *pdev = pci_get_drvdata(dev);
272 struct pxa2xx_spi_controller *spi_pdata;
274 spi_pdata = dev_get_platdata(&pdev->dev);
276 platform_device_unregister(pdev);
277 clk_unregister(spi_pdata->ssp.clk);
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 },
291 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
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,
300 module_pci_driver(pxa2xx_spi_pci_driver);
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>");