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