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
30 struct pxa_spi_info {
31 int (*setup)(struct pci_dev *pdev, struct pxa2xx_spi_controller *c);
32 };
33
34 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
35 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
36
37 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
38 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
39 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
40 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
41 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
42 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
43
44 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
45 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
46 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
47 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
48 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
49 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
50
51 static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
52 static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
53 static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
54 static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
55
pxa2xx_spi_pci_clk_unregister(void * clk)56 static void pxa2xx_spi_pci_clk_unregister(void *clk)
57 {
58 clk_unregister(clk);
59 }
60
pxa2xx_spi_pci_clk_register(struct pci_dev * dev,struct ssp_device * ssp,unsigned long rate)61 static 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
lpss_dma_filter(struct dma_chan * chan,void * param)74 static 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
lpss_dma_put_device(void * dma_dev)85 static void lpss_dma_put_device(void *dma_dev)
86 {
87 pci_dev_put(dma_dev);
88 }
89
lpss_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)90 static 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
167 static const struct pxa_spi_info lpss_info_config = {
168 .setup = lpss_spi_setup,
169 };
170
ce4100_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)171 static 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
182 static const struct pxa_spi_info ce4100_info_config = {
183 .setup = ce4100_spi_setup,
184 };
185
mrfld_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)186 static 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
239 static const struct pxa_spi_info mrfld_info_config = {
240 .setup = mrfld_spi_setup,
241 };
242
qrk_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)243 static 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
254 static const struct pxa_spi_info qrk_info_config = {
255 .setup = qrk_spi_setup,
256 };
257
pxa2xx_spi_pci_probe(struct pci_dev * dev,const struct pci_device_id * ent)258 static 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
pxa2xx_spi_pci_remove(struct pci_dev * dev)312 static 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
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 .probe = pxa2xx_spi_pci_probe,
339 .remove = pxa2xx_spi_pci_remove,
340 };
341
342 module_pci_driver(pxa2xx_spi_pci_driver);
343
344 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
345 MODULE_LICENSE("GPL v2");
346 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
347
