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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         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 64         if (!res) {
 65                 dev_err(&pdev->dev, "can't fetch device resource info\n");
 66                 return -EIO;
 67         }
 68 
 69         release_region(res->start, resource_size(res));
 70         return 0;
 71 }
 72 
 73 static struct resource cs5535_mfd_resources[NR_BARS];
 74 
 75 static struct mfd_cell cs5535_mfd_cells[] = {
 76         {
 77                 .id = SMB_BAR,
 78                 .name = "cs5535-smb",
 79                 .num_resources = 1,
 80                 .resources = &cs5535_mfd_resources[SMB_BAR],
 81         },
 82         {
 83                 .id = GPIO_BAR,
 84                 .name = "cs5535-gpio",
 85                 .num_resources = 1,
 86                 .resources = &cs5535_mfd_resources[GPIO_BAR],
 87         },
 88         {
 89                 .id = MFGPT_BAR,
 90                 .name = "cs5535-mfgpt",
 91                 .num_resources = 1,
 92                 .resources = &cs5535_mfd_resources[MFGPT_BAR],
 93         },
 94         {
 95                 .id = PMS_BAR,
 96                 .name = "cs5535-pms",
 97                 .num_resources = 1,
 98                 .resources = &cs5535_mfd_resources[PMS_BAR],
 99 
100                 .enable = cs5535_mfd_res_enable,
101                 .disable = cs5535_mfd_res_disable,
102         },
103         {
104                 .id = ACPI_BAR,
105                 .name = "cs5535-acpi",
106                 .num_resources = 1,
107                 .resources = &cs5535_mfd_resources[ACPI_BAR],
108 
109                 .enable = cs5535_mfd_res_enable,
110                 .disable = cs5535_mfd_res_disable,
111         },
112 };
113 
114 #ifdef CONFIG_OLPC
115 static void cs5535_clone_olpc_cells(void)
116 {
117         const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
118 
119         if (!machine_is_olpc())
120                 return;
121 
122         mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
123 }
124 #else
125 static void cs5535_clone_olpc_cells(void) { }
126 #endif
127 
128 static int cs5535_mfd_probe(struct pci_dev *pdev,
129                 const struct pci_device_id *id)
130 {
131         int err, i;
132 
133         err = pci_enable_device(pdev);
134         if (err)
135                 return err;
136 
137         /* fill in IO range for each cell; subdrivers handle the region */
138         for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
139                 int bar = cs5535_mfd_cells[i].id;
140                 struct resource *r = &cs5535_mfd_resources[bar];
141 
142                 r->flags = IORESOURCE_IO;
143                 r->start = pci_resource_start(pdev, bar);
144                 r->end = pci_resource_end(pdev, bar);
145 
146                 /* id is used for temporarily storing BAR; unset it now */
147                 cs5535_mfd_cells[i].id = 0;
148         }
149 
150         err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
151                               ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
152         if (err) {
153                 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
154                 goto err_disable;
155         }
156         cs5535_clone_olpc_cells();
157 
158         dev_info(&pdev->dev, "%zu devices registered.\n",
159                         ARRAY_SIZE(cs5535_mfd_cells));
160 
161         return 0;
162 
163 err_disable:
164         pci_disable_device(pdev);
165         return err;
166 }
167 
168 static void cs5535_mfd_remove(struct pci_dev *pdev)
169 {
170         mfd_remove_devices(&pdev->dev);
171         pci_disable_device(pdev);
172 }
173 
174 static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
175         { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
176         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
177         { 0, }
178 };
179 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
180 
181 static struct pci_driver cs5535_mfd_driver = {
182         .name = DRV_NAME,
183         .id_table = cs5535_mfd_pci_tbl,
184         .probe = cs5535_mfd_probe,
185         .remove = cs5535_mfd_remove,
186 };
187 
188 module_pci_driver(cs5535_mfd_driver);
189 
190 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
191 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
192 MODULE_LICENSE("GPL");
193 

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