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