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/device.h>
10 #include <linux/err.h>
11 #include <linux/module.h>
12 #include <linux/pci.h>
13 #include <linux/pm.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/sprintf.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18
19 #include <linux/dmaengine.h>
20 #include <linux/platform_data/dma-dw.h>
21
22 #include "spi-pxa2xx.h"
23
24 #define PCI_DEVICE_ID_INTEL_QUARK_X1000 0x0935
25 #define PCI_DEVICE_ID_INTEL_BYT 0x0f0e
26 #define PCI_DEVICE_ID_INTEL_MRFLD 0x1194
27 #define PCI_DEVICE_ID_INTEL_BSW0 0x228e
28 #define PCI_DEVICE_ID_INTEL_BSW1 0x2290
29 #define PCI_DEVICE_ID_INTEL_BSW2 0x22ac
30 #define PCI_DEVICE_ID_INTEL_CE4100 0x2e6a
31 #define PCI_DEVICE_ID_INTEL_LPT0_0 0x9c65
32 #define PCI_DEVICE_ID_INTEL_LPT0_1 0x9c66
33 #define PCI_DEVICE_ID_INTEL_LPT1_0 0x9ce5
34 #define PCI_DEVICE_ID_INTEL_LPT1_1 0x9ce6
35
36 struct pxa_spi_info {
37 int (*setup)(struct pci_dev *pdev, struct pxa2xx_spi_controller *c);
38 };
39
40 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
41 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
42
43 static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };
44 static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };
45 static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };
46 static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };
47 static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };
48 static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };
49
50 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
51 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
52 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
53 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
54 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
55 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
56
57 static struct dw_dma_slave lpt1_tx_param = { .dst_id = 0 };
58 static struct dw_dma_slave lpt1_rx_param = { .src_id = 1 };
59 static struct dw_dma_slave lpt0_tx_param = { .dst_id = 2 };
60 static struct dw_dma_slave lpt0_rx_param = { .src_id = 3 };
61
pxa2xx_spi_pci_clk_unregister(void * clk)62 static void pxa2xx_spi_pci_clk_unregister(void *clk)
63 {
64 clk_unregister(clk);
65 }
66
pxa2xx_spi_pci_clk_register(struct pci_dev * dev,struct ssp_device * ssp,unsigned long rate)67 static int pxa2xx_spi_pci_clk_register(struct pci_dev *dev, struct ssp_device *ssp,
68 unsigned long rate)
69 {
70 char buf[40];
71
72 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
73 ssp->clk = clk_register_fixed_rate(&dev->dev, buf, NULL, 0, rate);
74 if (IS_ERR(ssp->clk))
75 return PTR_ERR(ssp->clk);
76
77 return devm_add_action_or_reset(&dev->dev, pxa2xx_spi_pci_clk_unregister, ssp->clk);
78 }
79
lpss_dma_filter(struct dma_chan * chan,void * param)80 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
81 {
82 struct dw_dma_slave *dws = param;
83
84 if (dws->dma_dev != chan->device->dev)
85 return false;
86
87 chan->private = dws;
88 return true;
89 }
90
lpss_dma_put_device(void * dma_dev)91 static void lpss_dma_put_device(void *dma_dev)
92 {
93 pci_dev_put(dma_dev);
94 }
95
lpss_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)96 static int lpss_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
97 {
98 struct ssp_device *ssp = &c->ssp;
99 struct dw_dma_slave *tx, *rx;
100 struct pci_dev *dma_dev;
101 int ret;
102
103 switch (dev->device) {
104 case PCI_DEVICE_ID_INTEL_BYT:
105 ssp->type = LPSS_BYT_SSP;
106 ssp->port_id = 0;
107 c->tx_param = &byt_tx_param;
108 c->rx_param = &byt_rx_param;
109 break;
110 case PCI_DEVICE_ID_INTEL_BSW0:
111 ssp->type = LPSS_BSW_SSP;
112 ssp->port_id = 0;
113 c->tx_param = &bsw0_tx_param;
114 c->rx_param = &bsw0_rx_param;
115 break;
116 case PCI_DEVICE_ID_INTEL_BSW1:
117 ssp->type = LPSS_BSW_SSP;
118 ssp->port_id = 1;
119 c->tx_param = &bsw1_tx_param;
120 c->rx_param = &bsw1_rx_param;
121 break;
122 case PCI_DEVICE_ID_INTEL_BSW2:
123 ssp->type = LPSS_BSW_SSP;
124 ssp->port_id = 2;
125 c->tx_param = &bsw2_tx_param;
126 c->rx_param = &bsw2_rx_param;
127 break;
128 case PCI_DEVICE_ID_INTEL_LPT0_0:
129 case PCI_DEVICE_ID_INTEL_LPT1_0:
130 ssp->type = LPSS_LPT_SSP;
131 ssp->port_id = 0;
132 c->tx_param = &lpt0_tx_param;
133 c->rx_param = &lpt0_rx_param;
134 break;
135 case PCI_DEVICE_ID_INTEL_LPT0_1:
136 case PCI_DEVICE_ID_INTEL_LPT1_1:
137 ssp->type = LPSS_LPT_SSP;
138 ssp->port_id = 1;
139 c->tx_param = &lpt1_tx_param;
140 c->rx_param = &lpt1_rx_param;
141 break;
142 default:
143 return -ENODEV;
144 }
145
146 c->num_chipselect = 1;
147
148 ret = pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
149 if (ret)
150 return ret;
151
152 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
153 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
154 if (ret)
155 return ret;
156
157 tx = c->tx_param;
158 tx->dma_dev = &dma_dev->dev;
159 tx->m_master = 0;
160 tx->p_master = 1;
161
162 rx = c->rx_param;
163 rx->dma_dev = &dma_dev->dev;
164 rx->m_master = 0;
165 rx->p_master = 1;
166
167 c->dma_filter = lpss_dma_filter;
168 c->dma_burst_size = 1;
169 c->enable_dma = 1;
170 return 0;
171 }
172
173 static const struct pxa_spi_info lpss_info_config = {
174 .setup = lpss_spi_setup,
175 };
176
ce4100_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)177 static int ce4100_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
178 {
179 struct ssp_device *ssp = &c->ssp;
180
181 ssp->type = PXA25x_SSP;
182 ssp->port_id = dev->devfn;
183 c->num_chipselect = dev->devfn;
184
185 return pxa2xx_spi_pci_clk_register(dev, ssp, 3686400);
186 }
187
188 static const struct pxa_spi_info ce4100_info_config = {
189 .setup = ce4100_spi_setup,
190 };
191
mrfld_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)192 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
193 {
194 struct ssp_device *ssp = &c->ssp;
195 struct dw_dma_slave *tx, *rx;
196 struct pci_dev *dma_dev;
197 int ret;
198
199 ssp->type = MRFLD_SSP;
200
201 switch (PCI_FUNC(dev->devfn)) {
202 case 0:
203 ssp->port_id = 3;
204 c->num_chipselect = 1;
205 c->tx_param = &mrfld3_tx_param;
206 c->rx_param = &mrfld3_rx_param;
207 break;
208 case 1:
209 ssp->port_id = 5;
210 c->num_chipselect = 4;
211 c->tx_param = &mrfld5_tx_param;
212 c->rx_param = &mrfld5_rx_param;
213 break;
214 case 2:
215 ssp->port_id = 6;
216 c->num_chipselect = 1;
217 c->tx_param = &mrfld6_tx_param;
218 c->rx_param = &mrfld6_rx_param;
219 break;
220 default:
221 return -ENODEV;
222 }
223
224 ret = pxa2xx_spi_pci_clk_register(dev, ssp, 25000000);
225 if (ret)
226 return ret;
227
228 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));
229 ret = devm_add_action_or_reset(&dev->dev, lpss_dma_put_device, dma_dev);
230 if (ret)
231 return ret;
232
233 tx = c->tx_param;
234 tx->dma_dev = &dma_dev->dev;
235
236 rx = c->rx_param;
237 rx->dma_dev = &dma_dev->dev;
238
239 c->dma_filter = lpss_dma_filter;
240 c->dma_burst_size = 8;
241 c->enable_dma = 1;
242 return 0;
243 }
244
245 static const struct pxa_spi_info mrfld_info_config = {
246 .setup = mrfld_spi_setup,
247 };
248
qrk_spi_setup(struct pci_dev * dev,struct pxa2xx_spi_controller * c)249 static int qrk_spi_setup(struct pci_dev *dev, struct pxa2xx_spi_controller *c)
250 {
251 struct ssp_device *ssp = &c->ssp;
252
253 ssp->type = QUARK_X1000_SSP;
254 ssp->port_id = dev->devfn;
255 c->num_chipselect = 1;
256
257 return pxa2xx_spi_pci_clk_register(dev, ssp, 50000000);
258 }
259
260 static const struct pxa_spi_info qrk_info_config = {
261 .setup = qrk_spi_setup,
262 };
263
pxa2xx_spi_pci_probe(struct pci_dev * dev,const struct pci_device_id * ent)264 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
265 const struct pci_device_id *ent)
266 {
267 const struct pxa_spi_info *info;
268 int ret;
269 struct pxa2xx_spi_controller *pdata;
270 struct ssp_device *ssp;
271
272 ret = pcim_enable_device(dev);
273 if (ret)
274 return ret;
275
276 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
277 if (ret)
278 return ret;
279
280 pdata = devm_kzalloc(&dev->dev, sizeof(*pdata), GFP_KERNEL);
281 if (!pdata)
282 return -ENOMEM;
283
284 ssp = &pdata->ssp;
285 ssp->dev = &dev->dev;
286 ssp->phys_base = pci_resource_start(dev, 0);
287 ssp->mmio_base = pcim_iomap_table(dev)[0];
288
289 info = (struct pxa_spi_info *)ent->driver_data;
290 ret = info->setup(dev, pdata);
291 if (ret)
292 return ret;
293
294 pci_set_master(dev);
295
296 ret = pci_alloc_irq_vectors(dev, 1, 1, PCI_IRQ_ALL_TYPES);
297 if (ret < 0)
298 return ret;
299 ssp->irq = pci_irq_vector(dev, 0);
300
301 ret = pxa2xx_spi_probe(&dev->dev, ssp, pdata);
302 if (ret)
303 return ret;
304
305 pm_runtime_set_autosuspend_delay(&dev->dev, 50);
306 pm_runtime_use_autosuspend(&dev->dev);
307 pm_runtime_put_autosuspend(&dev->dev);
308 pm_runtime_allow(&dev->dev);
309
310 return 0;
311 }
312
pxa2xx_spi_pci_remove(struct pci_dev * dev)313 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
314 {
315 pm_runtime_forbid(&dev->dev);
316 pm_runtime_get_noresume(&dev->dev);
317
318 pxa2xx_spi_remove(&dev->dev);
319 }
320
321 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
322 { PCI_DEVICE_DATA(INTEL, QUARK_X1000, &qrk_info_config) },
323 { PCI_DEVICE_DATA(INTEL, BYT, &lpss_info_config) },
324 { PCI_DEVICE_DATA(INTEL, MRFLD, &mrfld_info_config) },
325 { PCI_DEVICE_DATA(INTEL, BSW0, &lpss_info_config) },
326 { PCI_DEVICE_DATA(INTEL, BSW1, &lpss_info_config) },
327 { PCI_DEVICE_DATA(INTEL, BSW2, &lpss_info_config) },
328 { PCI_DEVICE_DATA(INTEL, CE4100, &ce4100_info_config) },
329 { PCI_DEVICE_DATA(INTEL, LPT0_0, &lpss_info_config) },
330 { PCI_DEVICE_DATA(INTEL, LPT0_1, &lpss_info_config) },
331 { PCI_DEVICE_DATA(INTEL, LPT1_0, &lpss_info_config) },
332 { PCI_DEVICE_DATA(INTEL, LPT1_1, &lpss_info_config) },
333 { }
334 };
335 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
336
337 static struct pci_driver pxa2xx_spi_pci_driver = {
338 .name = "pxa2xx_spi_pci",
339 .id_table = pxa2xx_spi_pci_devices,
340 .driver = {
341 .pm = pm_ptr(&pxa2xx_spi_pm_ops),
342 },
343 .probe = pxa2xx_spi_pci_probe,
344 .remove = pxa2xx_spi_pci_remove,
345 };
346
347 module_pci_driver(pxa2xx_spi_pci_driver);
348
349 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
350 MODULE_LICENSE("GPL v2");
351 MODULE_IMPORT_NS(SPI_PXA2xx);
352 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
353