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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-provider.h>
 11 
 12 #include <linux/dmaengine.h>
 13 #include <linux/platform_data/dma-dw.h>
 14 
 15 enum {
 16         PORT_CE4100,
 17         PORT_BYT,
 18         PORT_BSW0,
 19         PORT_BSW1,
 20         PORT_BSW2,
 21         PORT_QUARK_X1000,
 22         PORT_LPT,
 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 struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
 47 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
 48 
 49 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
 50 {
 51         struct dw_dma_slave *dws = param;
 52 
 53         if (dws->dma_dev != chan->device->dev)
 54                 return false;
 55 
 56         chan->private = dws;
 57         return true;
 58 }
 59 
 60 static struct pxa_spi_info spi_info_configs[] = {
 61         [PORT_CE4100] = {
 62                 .type = PXA25x_SSP,
 63                 .port_id =  -1,
 64                 .num_chipselect = -1,
 65                 .max_clk_rate = 3686400,
 66         },
 67         [PORT_BYT] = {
 68                 .type = LPSS_BYT_SSP,
 69                 .port_id = 0,
 70                 .num_chipselect = 1,
 71                 .max_clk_rate = 50000000,
 72                 .tx_param = &byt_tx_param,
 73                 .rx_param = &byt_rx_param,
 74         },
 75         [PORT_BSW0] = {
 76                 .type = LPSS_BYT_SSP,
 77                 .port_id = 0,
 78                 .num_chipselect = 1,
 79                 .max_clk_rate = 50000000,
 80                 .tx_param = &bsw0_tx_param,
 81                 .rx_param = &bsw0_rx_param,
 82         },
 83         [PORT_BSW1] = {
 84                 .type = LPSS_BYT_SSP,
 85                 .port_id = 1,
 86                 .num_chipselect = 1,
 87                 .max_clk_rate = 50000000,
 88                 .tx_param = &bsw1_tx_param,
 89                 .rx_param = &bsw1_rx_param,
 90         },
 91         [PORT_BSW2] = {
 92                 .type = LPSS_BYT_SSP,
 93                 .port_id = 2,
 94                 .num_chipselect = 1,
 95                 .max_clk_rate = 50000000,
 96                 .tx_param = &bsw2_tx_param,
 97                 .rx_param = &bsw2_rx_param,
 98         },
 99         [PORT_QUARK_X1000] = {
100                 .type = QUARK_X1000_SSP,
101                 .port_id = -1,
102                 .num_chipselect = 1,
103                 .max_clk_rate = 50000000,
104         },
105         [PORT_LPT] = {
106                 .type = LPSS_LPT_SSP,
107                 .port_id = 0,
108                 .num_chipselect = 1,
109                 .max_clk_rate = 50000000,
110                 .tx_param = &lpt_tx_param,
111                 .rx_param = &lpt_rx_param,
112         },
113 };
114 
115 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
116                 const struct pci_device_id *ent)
117 {
118         struct platform_device_info pi;
119         int ret;
120         struct platform_device *pdev;
121         struct pxa2xx_spi_master spi_pdata;
122         struct ssp_device *ssp;
123         struct pxa_spi_info *c;
124         char buf[40];
125         struct pci_dev *dma_dev;
126 
127         ret = pcim_enable_device(dev);
128         if (ret)
129                 return ret;
130 
131         ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
132         if (ret)
133                 return ret;
134 
135         c = &spi_info_configs[ent->driver_data];
136 
137         memset(&spi_pdata, 0, sizeof(spi_pdata));
138         spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
139                                         c->num_chipselect : dev->devfn;
140 
141         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
142 
143         if (c->tx_param) {
144                 struct dw_dma_slave *slave = c->tx_param;
145 
146                 slave->dma_dev = &dma_dev->dev;
147                 slave->src_master = 1;
148                 slave->dst_master = 0;
149         }
150 
151         if (c->rx_param) {
152                 struct dw_dma_slave *slave = c->rx_param;
153 
154                 slave->dma_dev = &dma_dev->dev;
155                 slave->src_master = 1;
156                 slave->dst_master = 0;
157         }
158 
159         spi_pdata.dma_filter = lpss_dma_filter;
160         spi_pdata.tx_param = c->tx_param;
161         spi_pdata.rx_param = c->rx_param;
162         spi_pdata.enable_dma = c->rx_param && c->tx_param;
163 
164         ssp = &spi_pdata.ssp;
165         ssp->phys_base = pci_resource_start(dev, 0);
166         ssp->mmio_base = pcim_iomap_table(dev)[0];
167         if (!ssp->mmio_base) {
168                 dev_err(&dev->dev, "failed to ioremap() registers\n");
169                 return -EIO;
170         }
171         ssp->irq = dev->irq;
172         ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
173         ssp->type = c->type;
174 
175         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
176         ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
177                                         CLK_IS_ROOT, c->max_clk_rate);
178          if (IS_ERR(ssp->clk))
179                 return PTR_ERR(ssp->clk);
180 
181         memset(&pi, 0, sizeof(pi));
182         pi.parent = &dev->dev;
183         pi.name = "pxa2xx-spi";
184         pi.id = ssp->port_id;
185         pi.data = &spi_pdata;
186         pi.size_data = sizeof(spi_pdata);
187 
188         pdev = platform_device_register_full(&pi);
189         if (IS_ERR(pdev)) {
190                 clk_unregister(ssp->clk);
191                 return PTR_ERR(pdev);
192         }
193 
194         pci_set_drvdata(dev, pdev);
195 
196         return 0;
197 }
198 
199 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
200 {
201         struct platform_device *pdev = pci_get_drvdata(dev);
202         struct pxa2xx_spi_master *spi_pdata;
203 
204         spi_pdata = dev_get_platdata(&pdev->dev);
205 
206         platform_device_unregister(pdev);
207         clk_unregister(spi_pdata->ssp.clk);
208 }
209 
210 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
211         { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
212         { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
213         { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
214         { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
215         { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
216         { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
217         { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
218         { },
219 };
220 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
221 
222 static struct pci_driver pxa2xx_spi_pci_driver = {
223         .name           = "pxa2xx_spi_pci",
224         .id_table       = pxa2xx_spi_pci_devices,
225         .probe          = pxa2xx_spi_pci_probe,
226         .remove         = pxa2xx_spi_pci_remove,
227 };
228 
229 module_pci_driver(pxa2xx_spi_pci_driver);
230 
231 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
232 MODULE_LICENSE("GPL v2");
233 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
234 

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