summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/spi/spi-pxa2xx-pci.c
blob: fa7399e84bbb8f745354bb0822afd681f77ad057 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 * CE4100's SPI device is more or less the same one as found on PXA
 *
 */
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>

#include <linux/dmaengine.h>
#include <linux/platform_data/dma-dw.h>

enum {
	PORT_CE4100,
	PORT_BYT,
	PORT_BSW0,
	PORT_BSW1,
	PORT_BSW2,
	PORT_QUARK_X1000,
};

struct pxa_spi_info {
	enum pxa_ssp_type type;
	int port_id;
	int num_chipselect;
	unsigned long max_clk_rate;

	/* DMA channel request parameters */
	void *tx_param;
	void *rx_param;
};

static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
static struct dw_dma_slave byt_rx_param = { .src_id = 1 };

static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };

static bool lpss_dma_filter(struct dma_chan *chan, void *param)
{
	struct dw_dma_slave *dws = param;

	if (dws->dma_dev != chan->device->dev)
		return false;

	chan->private = dws;
	return true;
}

static struct pxa_spi_info spi_info_configs[] = {
	[PORT_CE4100] = {
		.type = PXA25x_SSP,
		.port_id =  -1,
		.num_chipselect = -1,
		.max_clk_rate = 3686400,
	},
	[PORT_BYT] = {
		.type = LPSS_SSP,
		.port_id = 0,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &byt_tx_param,
		.rx_param = &byt_rx_param,
	},
	[PORT_BSW0] = {
		.type = LPSS_SSP,
		.port_id = 0,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw0_tx_param,
		.rx_param = &bsw0_rx_param,
	},
	[PORT_BSW1] = {
		.type = LPSS_SSP,
		.port_id = 1,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw1_tx_param,
		.rx_param = &bsw1_rx_param,
	},
	[PORT_BSW2] = {
		.type = LPSS_SSP,
		.port_id = 2,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
		.tx_param = &bsw2_tx_param,
		.rx_param = &bsw2_rx_param,
	},
	[PORT_QUARK_X1000] = {
		.type = QUARK_X1000_SSP,
		.port_id = -1,
		.num_chipselect = 1,
		.max_clk_rate = 50000000,
	},
};

static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
		const struct pci_device_id *ent)
{
	struct platform_device_info pi;
	int ret;
	struct platform_device *pdev;
	struct pxa2xx_spi_master spi_pdata;
	struct ssp_device *ssp;
	struct pxa_spi_info *c;
	char buf[40];
	struct pci_dev *dma_dev;

	ret = pcim_enable_device(dev);
	if (ret)
		return ret;

	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
	if (ret)
		return ret;

	c = &spi_info_configs[ent->driver_data];

	memset(&spi_pdata, 0, sizeof(spi_pdata));
	spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
					c->num_chipselect : dev->devfn;

	dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));

	if (c->tx_param) {
		struct dw_dma_slave *slave = c->tx_param;

		slave->dma_dev = &dma_dev->dev;
		slave->src_master = 1;
		slave->dst_master = 0;
	}

	if (c->rx_param) {
		struct dw_dma_slave *slave = c->rx_param;

		slave->dma_dev = &dma_dev->dev;
		slave->src_master = 1;
		slave->dst_master = 0;
	}

	spi_pdata.dma_filter = lpss_dma_filter;
	spi_pdata.tx_param = c->tx_param;
	spi_pdata.rx_param = c->rx_param;
	spi_pdata.enable_dma = c->rx_param && c->tx_param;

	ssp = &spi_pdata.ssp;
	ssp->phys_base = pci_resource_start(dev, 0);
	ssp->mmio_base = pcim_iomap_table(dev)[0];
	if (!ssp->mmio_base) {
		dev_err(&dev->dev, "failed to ioremap() registers\n");
		return -EIO;
	}
	ssp->irq = dev->irq;
	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
	ssp->type = c->type;

	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
					CLK_IS_ROOT, c->max_clk_rate);
	 if (IS_ERR(ssp->clk))
		return PTR_ERR(ssp->clk);

	memset(&pi, 0, sizeof(pi));
	pi.parent = &dev->dev;
	pi.name = "pxa2xx-spi";
	pi.id = ssp->port_id;
	pi.data = &spi_pdata;
	pi.size_data = sizeof(spi_pdata);

	pdev = platform_device_register_full(&pi);
	if (IS_ERR(pdev)) {
		clk_unregister(ssp->clk);
		return PTR_ERR(pdev);
	}

	pci_set_drvdata(dev, pdev);

	return 0;
}

static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
{
	struct platform_device *pdev = pci_get_drvdata(dev);
	struct pxa2xx_spi_master *spi_pdata;

	spi_pdata = dev_get_platdata(&pdev->dev);

	platform_device_unregister(pdev);
	clk_unregister(spi_pdata->ssp.clk);
}

static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
	{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
	{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
	{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
	{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
	{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
	{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
	{ },
};
MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);

static struct pci_driver pxa2xx_spi_pci_driver = {
	.name           = "pxa2xx_spi_pci",
	.id_table       = pxa2xx_spi_pci_devices,
	.probe          = pxa2xx_spi_pci_probe,
	.remove         = pxa2xx_spi_pci_remove,
};

module_pci_driver(pxa2xx_spi_pci_driver);

MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");