1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Janz CMOD-IO MODULbus Carrier Board PCI Driver
11 #include <linux/module.h>
21 #define DRV_NAME "janz-cmodio"
23 /* Size of each MODULbus module in PCI BAR4 */
26 /* Maximum number of MODULbus modules on a CMOD-IO carrier board */
29 /* Module Parameters */
46 	struct janz_cmodio_onboard_regs __iomem *ctrl;  member
51 	/* mfd-core API */
58  * Subdevices using the mfd-core API
70 	pci = priv->pdev;  in cmodio_setup_subdevice()
71 	cell = &priv->cells[devno];  in cmodio_setup_subdevice()
72 	res = &priv->resources[devno * 3];  in cmodio_setup_subdevice()
73 	pdata = &priv->pdata[devno];  in cmodio_setup_subdevice()
75 	cell->name = name;  in cmodio_setup_subdevice()
76 	cell->resources = res;  in cmodio_setup_subdevice()
77 	cell->num_resources = 3;  in cmodio_setup_subdevice()
79 	/* Setup the subdevice ID -- must be unique */  in cmodio_setup_subdevice()
80 	cell->id = cmodio_id++;  in cmodio_setup_subdevice()
83 	pdata->modno = modno;  in cmodio_setup_subdevice()
84 	cell->platform_data = pdata;  in cmodio_setup_subdevice()
85 	cell->pdata_size = sizeof(*pdata);  in cmodio_setup_subdevice()
87 	/* MODULbus registers -- PCI BAR3 is big-endian MODULbus access */  in cmodio_setup_subdevice()
88 	res->flags = IORESOURCE_MEM;  in cmodio_setup_subdevice()
89 	res->parent = &pci->resource[3];  in cmodio_setup_subdevice()
90 	res->start = pci->resource[3].start + (CMODIO_MODULBUS_SIZE * modno);  in cmodio_setup_subdevice()
91 	res->end = res->start + CMODIO_MODULBUS_SIZE - 1;  in cmodio_setup_subdevice()
94 	/* PLX Control Registers -- PCI BAR4 is interrupt and other registers */  in cmodio_setup_subdevice()
95 	res->flags = IORESOURCE_MEM;  in cmodio_setup_subdevice()
96 	res->parent = &pci->resource[4];  in cmodio_setup_subdevice()
97 	res->start = pci->resource[4].start;  in cmodio_setup_subdevice()
98 	res->end = pci->resource[4].end;  in cmodio_setup_subdevice()
108 	res->flags = IORESOURCE_IRQ;  in cmodio_setup_subdevice()
109 	res->parent = NULL;  in cmodio_setup_subdevice()
110 	res->start = 0;  in cmodio_setup_subdevice()
111 	res->end = 0;  in cmodio_setup_subdevice()
120 	struct pci_dev *pdev = priv->pdev;  in cmodio_probe_submodules()
130 		dev_dbg(&priv->pdev->dev, "MODULbus %d: name %s\n", i, name);  in cmodio_probe_submodules()
137 		dev_err(&priv->pdev->dev, "no MODULbus modules specified, "  in cmodio_probe_submodules()
141 		return -ENODEV;  in cmodio_probe_submodules()
144 	return mfd_add_devices(&pdev->dev, 0, priv->cells,  in cmodio_probe_submodules()
145 			       num_probed, NULL, pdev->irq, NULL);  in cmodio_probe_submodules()
157 	return sysfs_emit(buf, "%x\n", priv->hex);  in modulbus_number_show()
181 	priv = devm_kzalloc(&dev->dev, sizeof(*priv), GFP_KERNEL);  in cmodio_pci_probe()
183 		return -ENOMEM;  in cmodio_pci_probe()
186 	priv->pdev = dev;  in cmodio_pci_probe()
191 		dev_err(&dev->dev, "unable to enable device\n");  in cmodio_pci_probe()
198 		dev_err(&dev->dev, "unable to request regions\n");  in cmodio_pci_probe()
203 	priv->ctrl = pci_ioremap_bar(dev, 4);  in cmodio_pci_probe()
204 	if (!priv->ctrl) {  in cmodio_pci_probe()
205 		dev_err(&dev->dev, "unable to remap onboard regs\n");  in cmodio_pci_probe()
206 		ret = -ENOMEM;  in cmodio_pci_probe()
211 	priv->hex = ioread8(&priv->ctrl->int_enable);  in cmodio_pci_probe()
214 	ret = sysfs_create_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);  in cmodio_pci_probe()
216 		dev_err(&dev->dev, "unable to create sysfs attributes\n");  in cmodio_pci_probe()
224 	iowrite8(0xf, &priv->ctrl->int_disable);  in cmodio_pci_probe()
229 		dev_err(&dev->dev, "unable to probe submodules\n");  in cmodio_pci_probe()
236 	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);  in cmodio_pci_probe()
238 	iounmap(priv->ctrl);  in cmodio_pci_probe()
251 	mfd_remove_devices(&dev->dev);  in cmodio_pci_remove()
252 	sysfs_remove_group(&dev->dev.kobj, &cmodio_sysfs_attr_group);  in cmodio_pci_remove()
253 	iounmap(priv->ctrl);  in cmodio_pci_remove()
260 /* The list of devices that this module will support */
282 MODULE_DESCRIPTION("Janz CMOD-IO PCI MODULbus Carrier Board Driver");