2 * CE4100's SPI device is more or less the same one as found on PXA
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>
13 #include <linux/dmaengine.h>
14 #include <linux/platform_data/dma-dw.h>
25 enum pxa_ssp_type type;
28 unsigned long max_clk_rate;
30 /* DMA channel request parameters */
35 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
36 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
38 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
39 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
40 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
41 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
42 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
43 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
45 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
47 struct dw_dma_slave *dws = param;
49 if (dws->dma_dev != chan->device->dev)
56 static struct pxa_spi_info spi_info_configs[] = {
61 .max_clk_rate = 3686400,
67 .max_clk_rate = 50000000,
68 .tx_param = &byt_tx_param,
69 .rx_param = &byt_rx_param,
75 .max_clk_rate = 50000000,
76 .tx_param = &bsw0_tx_param,
77 .rx_param = &bsw0_rx_param,
83 .max_clk_rate = 50000000,
84 .tx_param = &bsw1_tx_param,
85 .rx_param = &bsw1_rx_param,
91 .max_clk_rate = 50000000,
92 .tx_param = &bsw2_tx_param,
93 .rx_param = &bsw2_rx_param,
97 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
98 const struct pci_device_id *ent)
100 struct platform_device_info pi;
102 struct platform_device *pdev;
103 struct pxa2xx_spi_master spi_pdata;
104 struct ssp_device *ssp;
105 struct pxa_spi_info *c;
107 struct pci_dev *dma_dev;
109 ret = pcim_enable_device(dev);
113 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
117 c = &spi_info_configs[ent->driver_data];
119 memset(&spi_pdata, 0, sizeof(spi_pdata));
120 spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
121 c->num_chipselect : dev->devfn;
123 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
126 struct dw_dma_slave *slave = c->tx_param;
128 slave->dma_dev = &dma_dev->dev;
129 slave->src_master = 1;
130 slave->dst_master = 0;
134 struct dw_dma_slave *slave = c->rx_param;
136 slave->dma_dev = &dma_dev->dev;
137 slave->src_master = 1;
138 slave->dst_master = 0;
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;
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");
154 ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
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);
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);
170 pdev = platform_device_register_full(&pi);
172 clk_unregister(ssp->clk);
173 return PTR_ERR(pdev);
176 pci_set_drvdata(dev, pdev);
181 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
183 struct platform_device *pdev = pci_get_drvdata(dev);
184 struct pxa2xx_spi_master *spi_pdata;
186 spi_pdata = dev_get_platdata(&pdev->dev);
188 platform_device_unregister(pdev);
189 clk_unregister(spi_pdata->ssp.clk);
192 static 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 },
200 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
202 static 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,
209 module_pci_driver(pxa2xx_spi_pci_driver);
211 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
212 MODULE_LICENSE("GPL v2");
213 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");