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