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/drivers/mfd/cs5535-mfd.c

http://github.com/mirrors/linux
C | 164 lines | 129 code | 24 blank | 11 comment | 8 complexity | 7d42dea14e701528fabb74bad4647b2f MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
  4 *
  5 * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
  6 * used for accessing GPIOs, MFGPTs, ACPI, etc.  Each subdevice has
  7 * an IO range that's specified in a single BAR.  The BAR order is
  8 * hardcoded in the CS553x specifications.
  9 *
 10 * Copyright (c) 2010  Andres Salomon <dilinger@queued.net>
 11 */
 12
 13#include <linux/kernel.h>
 14#include <linux/mfd/core.h>
 15#include <linux/module.h>
 16#include <linux/pci.h>
 17#include <asm/olpc.h>
 18
 19#define DRV_NAME "cs5535-mfd"
 20
 21enum cs5535_mfd_bars {
 22	SMB_BAR = 0,
 23	GPIO_BAR = 1,
 24	MFGPT_BAR = 2,
 25	PMS_BAR = 4,
 26	ACPI_BAR = 5,
 27	NR_BARS,
 28};
 29
 30static struct resource cs5535_mfd_resources[NR_BARS];
 31
 32static struct mfd_cell cs5535_mfd_cells[] = {
 33	{
 34		.name = "cs5535-smb",
 35		.num_resources = 1,
 36		.resources = &cs5535_mfd_resources[SMB_BAR],
 37	},
 38	{
 39		.name = "cs5535-gpio",
 40		.num_resources = 1,
 41		.resources = &cs5535_mfd_resources[GPIO_BAR],
 42	},
 43	{
 44		.name = "cs5535-mfgpt",
 45		.num_resources = 1,
 46		.resources = &cs5535_mfd_resources[MFGPT_BAR],
 47	},
 48	{
 49		.name = "cs5535-pms",
 50		.num_resources = 1,
 51		.resources = &cs5535_mfd_resources[PMS_BAR],
 52	},
 53};
 54
 55static struct mfd_cell cs5535_olpc_mfd_cells[] = {
 56	{
 57		.name = "olpc-xo1-pm-acpi",
 58		.num_resources = 1,
 59		.resources = &cs5535_mfd_resources[ACPI_BAR],
 60	},
 61	{
 62		.name = "olpc-xo1-sci-acpi",
 63		.num_resources = 1,
 64		.resources = &cs5535_mfd_resources[ACPI_BAR],
 65	},
 66};
 67
 68static int cs5535_mfd_probe(struct pci_dev *pdev,
 69		const struct pci_device_id *id)
 70{
 71	int err, bar;
 72
 73	err = pci_enable_device(pdev);
 74	if (err)
 75		return err;
 76
 77	for (bar = 0; bar < NR_BARS; bar++) {
 78		struct resource *r = &cs5535_mfd_resources[bar];
 79
 80		r->flags = IORESOURCE_IO;
 81		r->start = pci_resource_start(pdev, bar);
 82		r->end = pci_resource_end(pdev, bar);
 83	}
 84
 85	err = pci_request_region(pdev, PMS_BAR, DRV_NAME);
 86	if (err) {
 87		dev_err(&pdev->dev, "Failed to request PMS_BAR's IO region\n");
 88		goto err_disable;
 89	}
 90
 91	err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, cs5535_mfd_cells,
 92			      ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
 93	if (err) {
 94		dev_err(&pdev->dev,
 95			"Failed to add CS5535 sub-devices: %d\n", err);
 96		goto err_release_pms;
 97	}
 98
 99	if (machine_is_olpc()) {
100		err = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
101		if (err) {
102			dev_err(&pdev->dev,
103				"Failed to request ACPI_BAR's IO region\n");
104			goto err_remove_devices;
105		}
106
107		err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE,
108				      cs5535_olpc_mfd_cells,
109				      ARRAY_SIZE(cs5535_olpc_mfd_cells),
110				      NULL, 0, NULL);
111		if (err) {
112			dev_err(&pdev->dev,
113				"Failed to add CS5535 OLPC sub-devices: %d\n",
114				err);
115			goto err_release_acpi;
116		}
117	}
118
119	dev_info(&pdev->dev, "%zu devices registered.\n",
120			ARRAY_SIZE(cs5535_mfd_cells));
121
122	return 0;
123
124err_release_acpi:
125	pci_release_region(pdev, ACPI_BAR);
126err_remove_devices:
127	mfd_remove_devices(&pdev->dev);
128err_release_pms:
129	pci_release_region(pdev, PMS_BAR);
130err_disable:
131	pci_disable_device(pdev);
132	return err;
133}
134
135static void cs5535_mfd_remove(struct pci_dev *pdev)
136{
137	mfd_remove_devices(&pdev->dev);
138
139	if (machine_is_olpc())
140		pci_release_region(pdev, ACPI_BAR);
141
142	pci_release_region(pdev, PMS_BAR);
143	pci_disable_device(pdev);
144}
145
146static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
147	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
148	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
149	{ 0, }
150};
151MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
152
153static struct pci_driver cs5535_mfd_driver = {
154	.name = DRV_NAME,
155	.id_table = cs5535_mfd_pci_tbl,
156	.probe = cs5535_mfd_probe,
157	.remove = cs5535_mfd_remove,
158};
159
160module_pci_driver(cs5535_mfd_driver);
161
162MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
163MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
164MODULE_LICENSE("GPL");