xref: /openbmc/linux/drivers/spi/spi-pxa2xx-pci.c (revision e2f1cf25)
1 /*
2  * CE4100's SPI device is more or less the same one as found on PXA
3  *
4  */
5 #include <linux/pci.h>
6 #include <linux/platform_device.h>
7 #include <linux/of_device.h>
8 #include <linux/module.h>
9 #include <linux/spi/pxa2xx_spi.h>
10 #include <linux/clk.h>
11 #include <linux/clk-provider.h>
12 
13 #include <linux/dmaengine.h>
14 #include <linux/platform_data/dma-dw.h>
15 
16 enum {
17 	PORT_CE4100,
18 	PORT_BYT,
19 	PORT_BSW0,
20 	PORT_BSW1,
21 	PORT_BSW2,
22 	PORT_QUARK_X1000,
23 };
24 
25 struct pxa_spi_info {
26 	enum pxa_ssp_type type;
27 	int port_id;
28 	int num_chipselect;
29 	unsigned long max_clk_rate;
30 
31 	/* DMA channel request parameters */
32 	void *tx_param;
33 	void *rx_param;
34 };
35 
36 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
37 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
38 
39 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
40 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
41 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
42 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
43 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
44 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
45 
46 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
47 {
48 	struct dw_dma_slave *dws = param;
49 
50 	if (dws->dma_dev != chan->device->dev)
51 		return false;
52 
53 	chan->private = dws;
54 	return true;
55 }
56 
57 static struct pxa_spi_info spi_info_configs[] = {
58 	[PORT_CE4100] = {
59 		.type = PXA25x_SSP,
60 		.port_id =  -1,
61 		.num_chipselect = -1,
62 		.max_clk_rate = 3686400,
63 	},
64 	[PORT_BYT] = {
65 		.type = LPSS_BYT_SSP,
66 		.port_id = 0,
67 		.num_chipselect = 1,
68 		.max_clk_rate = 50000000,
69 		.tx_param = &byt_tx_param,
70 		.rx_param = &byt_rx_param,
71 	},
72 	[PORT_BSW0] = {
73 		.type = LPSS_BYT_SSP,
74 		.port_id = 0,
75 		.num_chipselect = 1,
76 		.max_clk_rate = 50000000,
77 		.tx_param = &bsw0_tx_param,
78 		.rx_param = &bsw0_rx_param,
79 	},
80 	[PORT_BSW1] = {
81 		.type = LPSS_BYT_SSP,
82 		.port_id = 1,
83 		.num_chipselect = 1,
84 		.max_clk_rate = 50000000,
85 		.tx_param = &bsw1_tx_param,
86 		.rx_param = &bsw1_rx_param,
87 	},
88 	[PORT_BSW2] = {
89 		.type = LPSS_BYT_SSP,
90 		.port_id = 2,
91 		.num_chipselect = 1,
92 		.max_clk_rate = 50000000,
93 		.tx_param = &bsw2_tx_param,
94 		.rx_param = &bsw2_rx_param,
95 	},
96 	[PORT_QUARK_X1000] = {
97 		.type = QUARK_X1000_SSP,
98 		.port_id = -1,
99 		.num_chipselect = 1,
100 		.max_clk_rate = 50000000,
101 	},
102 };
103 
104 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
105 		const struct pci_device_id *ent)
106 {
107 	struct platform_device_info pi;
108 	int ret;
109 	struct platform_device *pdev;
110 	struct pxa2xx_spi_master spi_pdata;
111 	struct ssp_device *ssp;
112 	struct pxa_spi_info *c;
113 	char buf[40];
114 	struct pci_dev *dma_dev;
115 
116 	ret = pcim_enable_device(dev);
117 	if (ret)
118 		return ret;
119 
120 	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
121 	if (ret)
122 		return ret;
123 
124 	c = &spi_info_configs[ent->driver_data];
125 
126 	memset(&spi_pdata, 0, sizeof(spi_pdata));
127 	spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
128 					c->num_chipselect : dev->devfn;
129 
130 	dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
131 
132 	if (c->tx_param) {
133 		struct dw_dma_slave *slave = c->tx_param;
134 
135 		slave->dma_dev = &dma_dev->dev;
136 		slave->src_master = 1;
137 		slave->dst_master = 0;
138 	}
139 
140 	if (c->rx_param) {
141 		struct dw_dma_slave *slave = c->rx_param;
142 
143 		slave->dma_dev = &dma_dev->dev;
144 		slave->src_master = 1;
145 		slave->dst_master = 0;
146 	}
147 
148 	spi_pdata.dma_filter = lpss_dma_filter;
149 	spi_pdata.tx_param = c->tx_param;
150 	spi_pdata.rx_param = c->rx_param;
151 	spi_pdata.enable_dma = c->rx_param && c->tx_param;
152 
153 	ssp = &spi_pdata.ssp;
154 	ssp->phys_base = pci_resource_start(dev, 0);
155 	ssp->mmio_base = pcim_iomap_table(dev)[0];
156 	if (!ssp->mmio_base) {
157 		dev_err(&dev->dev, "failed to ioremap() registers\n");
158 		return -EIO;
159 	}
160 	ssp->irq = dev->irq;
161 	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
162 	ssp->type = c->type;
163 
164 	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
165 	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
166 					CLK_IS_ROOT, c->max_clk_rate);
167 	 if (IS_ERR(ssp->clk))
168 		return PTR_ERR(ssp->clk);
169 
170 	memset(&pi, 0, sizeof(pi));
171 	pi.parent = &dev->dev;
172 	pi.name = "pxa2xx-spi";
173 	pi.id = ssp->port_id;
174 	pi.data = &spi_pdata;
175 	pi.size_data = sizeof(spi_pdata);
176 
177 	pdev = platform_device_register_full(&pi);
178 	if (IS_ERR(pdev)) {
179 		clk_unregister(ssp->clk);
180 		return PTR_ERR(pdev);
181 	}
182 
183 	pci_set_drvdata(dev, pdev);
184 
185 	return 0;
186 }
187 
188 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
189 {
190 	struct platform_device *pdev = pci_get_drvdata(dev);
191 	struct pxa2xx_spi_master *spi_pdata;
192 
193 	spi_pdata = dev_get_platdata(&pdev->dev);
194 
195 	platform_device_unregister(pdev);
196 	clk_unregister(spi_pdata->ssp.clk);
197 }
198 
199 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
200 	{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
201 	{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
202 	{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
203 	{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
204 	{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
205 	{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
206 	{ },
207 };
208 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
209 
210 static struct pci_driver pxa2xx_spi_pci_driver = {
211 	.name           = "pxa2xx_spi_pci",
212 	.id_table       = pxa2xx_spi_pci_devices,
213 	.probe          = pxa2xx_spi_pci_probe,
214 	.remove         = pxa2xx_spi_pci_remove,
215 };
216 
217 module_pci_driver(pxa2xx_spi_pci_driver);
218 
219 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
220 MODULE_LICENSE("GPL v2");
221 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
222