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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 };
 23 
 24 struct 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 
 35 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
 36 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
 37 
 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 };
 44 
 45 static 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 
 56 static 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 
 97 static 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 
181 static 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 
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 },
198         { },
199 };
200 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
201 
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,
207 };
208 
209 module_pci_driver(pxa2xx_spi_pci_driver);
210 
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>");
214 

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