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Linux/drivers/mfd/cs5535-mfd.c

  1 /*
  2  * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
  3  *
  4  * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
  5  * used for accessing GPIOs, MFGPTs, ACPI, etc.  Each subdevice has
  6  * an IO range that's specified in a single BAR.  The BAR order is
  7  * hardcoded in the CS553x specifications.
  8  *
  9  * Copyright (c) 2010  Andres Salomon <dilinger@queued.net>
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License version 2 as
 13  * published by the Free Software Foundation.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 23  */
 24 
 25 #include <linux/kernel.h>
 26 #include <linux/mfd/core.h>
 27 #include <linux/module.h>
 28 #include <linux/pci.h>
 29 #include <asm/olpc.h>
 30 
 31 #define DRV_NAME "cs5535-mfd"
 32 
 33 enum cs5535_mfd_bars {
 34         SMB_BAR = 0,
 35         GPIO_BAR = 1,
 36         MFGPT_BAR = 2,
 37         PMS_BAR = 4,
 38         ACPI_BAR = 5,
 39         NR_BARS,
 40 };
 41 
 42 static int cs5535_mfd_res_enable(struct platform_device *pdev)
 43 {
 44         struct resource *res;
 45 
 46         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 47         if (!res) {
 48                 dev_err(&pdev->dev, "can't fetch device resource info\n");
 49                 return -EIO;
 50         }
 51 
 52         if (!request_region(res->start, resource_size(res), DRV_NAME)) {
 53                 dev_err(&pdev->dev, "can't request region\n");
 54                 return -EIO;
 55         }
 56 
 57         return 0;
 58 }
 59 
 60 static int cs5535_mfd_res_disable(struct platform_device *pdev)
 61 {
 62         struct resource *res;
 63 
 64         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 65         if (!res) {
 66                 dev_err(&pdev->dev, "can't fetch device resource info\n");
 67                 return -EIO;
 68         }
 69 
 70         release_region(res->start, resource_size(res));
 71         return 0;
 72 }
 73 
 74 static struct resource cs5535_mfd_resources[NR_BARS];
 75 
 76 static struct mfd_cell cs5535_mfd_cells[] = {
 77         {
 78                 .id = SMB_BAR,
 79                 .name = "cs5535-smb",
 80                 .num_resources = 1,
 81                 .resources = &cs5535_mfd_resources[SMB_BAR],
 82         },
 83         {
 84                 .id = GPIO_BAR,
 85                 .name = "cs5535-gpio",
 86                 .num_resources = 1,
 87                 .resources = &cs5535_mfd_resources[GPIO_BAR],
 88         },
 89         {
 90                 .id = MFGPT_BAR,
 91                 .name = "cs5535-mfgpt",
 92                 .num_resources = 1,
 93                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
 94         },
 95         {
 96                 .id = PMS_BAR,
 97                 .name = "cs5535-pms",
 98                 .num_resources = 1,
 99                 .resources = &cs5535_mfd_resources[PMS_BAR],
100 
101                 .enable = cs5535_mfd_res_enable,
102                 .disable = cs5535_mfd_res_disable,
103         },
104         {
105                 .id = ACPI_BAR,
106                 .name = "cs5535-acpi",
107                 .num_resources = 1,
108                 .resources = &cs5535_mfd_resources[ACPI_BAR],
109 
110                 .enable = cs5535_mfd_res_enable,
111                 .disable = cs5535_mfd_res_disable,
112         },
113 };
114 
115 #ifdef CONFIG_OLPC
116 static void cs5535_clone_olpc_cells(void)
117 {
118         static const char *acpi_clones[] = {
119                 "olpc-xo1-pm-acpi",
120                 "olpc-xo1-sci-acpi"
121         };
122 
123         if (!machine_is_olpc())
124                 return;
125 
126         mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
127 }
128 #else
129 static void cs5535_clone_olpc_cells(void) { }
130 #endif
131 
132 static int cs5535_mfd_probe(struct pci_dev *pdev,
133                 const struct pci_device_id *id)
134 {
135         int err, i;
136 
137         err = pci_enable_device(pdev);
138         if (err)
139                 return err;
140 
141         /* fill in IO range for each cell; subdrivers handle the region */
142         for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
143                 int bar = cs5535_mfd_cells[i].id;
144                 struct resource *r = &cs5535_mfd_resources[bar];
145 
146                 r->flags = IORESOURCE_IO;
147                 r->start = pci_resource_start(pdev, bar);
148                 r->end = pci_resource_end(pdev, bar);
149 
150                 /* id is used for temporarily storing BAR; unset it now */
151                 cs5535_mfd_cells[i].id = 0;
152         }
153 
154         err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
155                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
156         if (err) {
157                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
158                 goto err_disable;
159         }
160         cs5535_clone_olpc_cells();
161 
162         dev_info(&pdev->dev, "%zu devices registered.\n",
163                         ARRAY_SIZE(cs5535_mfd_cells));
164 
165         return 0;
166 
167 err_disable:
168         pci_disable_device(pdev);
169         return err;
170 }
171 
172 static void cs5535_mfd_remove(struct pci_dev *pdev)
173 {
174         mfd_remove_devices(&pdev->dev);
175         pci_disable_device(pdev);
176 }
177 
178 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
179         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
180         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
181         { 0, }
182 };
183 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
184 
185 static struct pci_driver cs5535_mfd_driver = {
186         .name = DRV_NAME,
187         .id_table = cs5535_mfd_pci_tbl,
188         .probe = cs5535_mfd_probe,
189         .remove = cs5535_mfd_remove,
190 };
191 
192 module_pci_driver(cs5535_mfd_driver);
193 
194 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
195 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
196 MODULE_LICENSE("GPL");
197 

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