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
16enum {
17	PORT_CE4100,
18	PORT_BYT,
19	PORT_BSW0,
20	PORT_BSW1,
21	PORT_BSW2,
22	PORT_QUARK_X1000,
23};
24
25struct 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
36static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
37static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
38
39static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
40static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
41static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
42static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
43static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
44static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
45
46static 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
57static 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_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_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_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_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
104static 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
188static 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
199static 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};
208MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
209
210static 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
217module_pci_driver(pxa2xx_spi_pci_driver);
218
219MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
220MODULE_LICENSE("GPL v2");
221MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
222