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Linux/drivers/spi/spi-pxa2xx-pci.c

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

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