1
2
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
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_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
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
