xref: /openbmc/linux/drivers/spi/spi-pxa2xx-pci.c (revision fcaaf76e)
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