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