2 * CE4100's SPI device is more or less the same one as found on PXA
4 * Copyright (C) 2016, Intel Corporation
6 #include <linux/clk-provider.h>
7 #include <linux/module.h>
8 #include <linux/of_device.h>
10 #include <linux/platform_device.h>
11 #include <linux/spi/pxa2xx_spi.h>
13 #include <linux/dmaengine.h>
14 #include <linux/platform_data/dma-dw.h>
28 enum pxa_ssp_type type;
31 unsigned long max_clk_rate;
33 /* DMA channel request parameters */
34 bool (*dma_filter)(struct dma_chan *chan, void *param);
38 int (*setup)(struct pci_dev *pdev, struct pxa_spi_info *c);
41 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
42 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
44 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
45 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
46 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
47 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
48 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
49 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
51 static struct dw_dma_slave lpt_tx_param = { .dst_id = 0 };
52 static struct dw_dma_slave lpt_rx_param = { .src_id = 1 };
54 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
56 struct dw_dma_slave *dws = param;
58 if (dws->dma_dev != chan->device->dev)
65 static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
67 struct pci_dev *dma_dev;
69 c->num_chipselect = 1;
70 c->max_clk_rate = 50000000;
72 dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
75 struct dw_dma_slave *slave = c->tx_param;
77 slave->dma_dev = &dma_dev->dev;
83 struct dw_dma_slave *slave = c->rx_param;
85 slave->dma_dev = &dma_dev->dev;
90 c->dma_filter = lpss_dma_filter;
94 static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)
96 switch (PCI_FUNC(dev->devfn)) {
99 c->num_chipselect = 1;
103 c->num_chipselect = 4;
107 c->num_chipselect = 1;
115 static struct pxa_spi_info spi_info_configs[] = {
119 .num_chipselect = -1,
120 .max_clk_rate = 3686400,
123 .type = LPSS_BYT_SSP,
125 .setup = lpss_spi_setup,
126 .tx_param = &byt_tx_param,
127 .rx_param = &byt_rx_param,
130 .type = LPSS_BSW_SSP,
132 .setup = lpss_spi_setup,
133 .tx_param = &bsw0_tx_param,
134 .rx_param = &bsw0_rx_param,
137 .type = LPSS_BSW_SSP,
139 .setup = lpss_spi_setup,
140 .tx_param = &bsw1_tx_param,
141 .rx_param = &bsw1_rx_param,
144 .type = LPSS_BSW_SSP,
146 .setup = lpss_spi_setup,
147 .tx_param = &bsw2_tx_param,
148 .rx_param = &bsw2_rx_param,
152 .max_clk_rate = 25000000,
153 .setup = mrfld_spi_setup,
155 [PORT_QUARK_X1000] = {
156 .type = QUARK_X1000_SSP,
159 .max_clk_rate = 50000000,
162 .type = LPSS_LPT_SSP,
164 .setup = lpss_spi_setup,
165 .tx_param = &lpt_tx_param,
166 .rx_param = &lpt_rx_param,
170 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
171 const struct pci_device_id *ent)
173 struct platform_device_info pi;
175 struct platform_device *pdev;
176 struct pxa2xx_spi_master spi_pdata;
177 struct ssp_device *ssp;
178 struct pxa_spi_info *c;
181 ret = pcim_enable_device(dev);
185 ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
189 c = &spi_info_configs[ent->driver_data];
191 ret = c->setup(dev, c);
196 memset(&spi_pdata, 0, sizeof(spi_pdata));
197 spi_pdata.num_chipselect = (c->num_chipselect > 0) ? c->num_chipselect : dev->devfn;
198 spi_pdata.dma_filter = c->dma_filter;
199 spi_pdata.tx_param = c->tx_param;
200 spi_pdata.rx_param = c->rx_param;
201 spi_pdata.enable_dma = c->rx_param && c->tx_param;
203 ssp = &spi_pdata.ssp;
204 ssp->phys_base = pci_resource_start(dev, 0);
205 ssp->mmio_base = pcim_iomap_table(dev)[0];
207 ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
210 snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
211 ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL, 0,
213 if (IS_ERR(ssp->clk))
214 return PTR_ERR(ssp->clk);
216 memset(&pi, 0, sizeof(pi));
217 pi.parent = &dev->dev;
218 pi.name = "pxa2xx-spi";
219 pi.id = ssp->port_id;
220 pi.data = &spi_pdata;
221 pi.size_data = sizeof(spi_pdata);
223 pdev = platform_device_register_full(&pi);
225 clk_unregister(ssp->clk);
226 return PTR_ERR(pdev);
229 pci_set_drvdata(dev, pdev);
234 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
236 struct platform_device *pdev = pci_get_drvdata(dev);
237 struct pxa2xx_spi_master *spi_pdata;
239 spi_pdata = dev_get_platdata(&pdev->dev);
241 platform_device_unregister(pdev);
242 clk_unregister(spi_pdata->ssp.clk);
245 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
246 { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
247 { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
248 { PCI_VDEVICE(INTEL, 0x1194), PORT_MRFLD },
249 { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
250 { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
251 { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
252 { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
253 { PCI_VDEVICE(INTEL, 0x9ce6), PORT_LPT },
256 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
258 static struct pci_driver pxa2xx_spi_pci_driver = {
259 .name = "pxa2xx_spi_pci",
260 .id_table = pxa2xx_spi_pci_devices,
261 .probe = pxa2xx_spi_pci_probe,
262 .remove = pxa2xx_spi_pci_remove,
265 module_pci_driver(pxa2xx_spi_pci_driver);
267 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
268 MODULE_LICENSE("GPL v2");
269 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");