1 /* 2 * cb710/core.c 3 * 4 * Copyright by Michał Mirosław, 2008-2009 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/pci.h> 13 #include <linux/spinlock.h> 14 #include <linux/idr.h> 15 #include <linux/cb710.h> 16 #include <linux/gfp.h> 17 18 static DEFINE_IDA(cb710_ida); 19 20 void cb710_pci_update_config_reg(struct pci_dev *pdev, 21 int reg, uint32_t mask, uint32_t xor) 22 { 23 u32 rval; 24 25 pci_read_config_dword(pdev, reg, &rval); 26 rval = (rval & mask) ^ xor; 27 pci_write_config_dword(pdev, reg, rval); 28 } 29 EXPORT_SYMBOL_GPL(cb710_pci_update_config_reg); 30 31 /* Some magic writes based on Windows driver init code */ 32 static int cb710_pci_configure(struct pci_dev *pdev) 33 { 34 unsigned int devfn = PCI_DEVFN(PCI_SLOT(pdev->devfn), 0); 35 struct pci_dev *pdev0; 36 u32 val; 37 38 cb710_pci_update_config_reg(pdev, 0x48, 39 ~0x000000FF, 0x0000003F); 40 41 pci_read_config_dword(pdev, 0x48, &val); 42 if (val & 0x80000000) 43 return 0; 44 45 pdev0 = pci_get_slot(pdev->bus, devfn); 46 if (!pdev0) 47 return -ENODEV; 48 49 if (pdev0->vendor == PCI_VENDOR_ID_ENE 50 && pdev0->device == PCI_DEVICE_ID_ENE_720) { 51 cb710_pci_update_config_reg(pdev0, 0x8C, 52 ~0x00F00000, 0x00100000); 53 cb710_pci_update_config_reg(pdev0, 0xB0, 54 ~0x08000000, 0x08000000); 55 } 56 57 cb710_pci_update_config_reg(pdev0, 0x8C, 58 ~0x00000F00, 0x00000200); 59 cb710_pci_update_config_reg(pdev0, 0x90, 60 ~0x00060000, 0x00040000); 61 62 pci_dev_put(pdev0); 63 64 return 0; 65 } 66 67 static irqreturn_t cb710_irq_handler(int irq, void *data) 68 { 69 struct cb710_chip *chip = data; 70 struct cb710_slot *slot = &chip->slot[0]; 71 irqreturn_t handled = IRQ_NONE; 72 unsigned nr; 73 74 spin_lock(&chip->irq_lock); /* incl. smp_rmb() */ 75 76 for (nr = chip->slots; nr; ++slot, --nr) { 77 cb710_irq_handler_t handler_func = slot->irq_handler; 78 if (handler_func && handler_func(slot)) 79 handled = IRQ_HANDLED; 80 } 81 82 spin_unlock(&chip->irq_lock); 83 84 return handled; 85 } 86 87 static void cb710_release_slot(struct device *dev) 88 { 89 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS 90 struct cb710_slot *slot = cb710_pdev_to_slot(to_platform_device(dev)); 91 struct cb710_chip *chip = cb710_slot_to_chip(slot); 92 93 /* slot struct can be freed now */ 94 atomic_dec(&chip->slot_refs_count); 95 #endif 96 } 97 98 static int cb710_register_slot(struct cb710_chip *chip, 99 unsigned slot_mask, unsigned io_offset, const char *name) 100 { 101 int nr = chip->slots; 102 struct cb710_slot *slot = &chip->slot[nr]; 103 int err; 104 105 dev_dbg(cb710_chip_dev(chip), 106 "register: %s.%d; slot %d; mask %d; IO offset: 0x%02X\n", 107 name, chip->platform_id, nr, slot_mask, io_offset); 108 109 /* slot->irq_handler == NULL here; this needs to be 110 * seen before platform_device_register() */ 111 ++chip->slots; 112 smp_wmb(); 113 114 slot->iobase = chip->iobase + io_offset; 115 slot->pdev.name = name; 116 slot->pdev.id = chip->platform_id; 117 slot->pdev.dev.parent = &chip->pdev->dev; 118 slot->pdev.dev.release = cb710_release_slot; 119 120 err = platform_device_register(&slot->pdev); 121 122 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS 123 atomic_inc(&chip->slot_refs_count); 124 #endif 125 126 if (err) { 127 /* device_initialize() called from platform_device_register() 128 * wants this on error path */ 129 platform_device_put(&slot->pdev); 130 131 /* slot->irq_handler == NULL here anyway, so no lock needed */ 132 --chip->slots; 133 return err; 134 } 135 136 chip->slot_mask |= slot_mask; 137 138 return 0; 139 } 140 141 static void cb710_unregister_slot(struct cb710_chip *chip, 142 unsigned slot_mask) 143 { 144 int nr = chip->slots - 1; 145 146 if (!(chip->slot_mask & slot_mask)) 147 return; 148 149 platform_device_unregister(&chip->slot[nr].pdev); 150 151 /* complementary to spin_unlock() in cb710_set_irq_handler() */ 152 smp_rmb(); 153 BUG_ON(chip->slot[nr].irq_handler != NULL); 154 155 /* slot->irq_handler == NULL here, so no lock needed */ 156 --chip->slots; 157 chip->slot_mask &= ~slot_mask; 158 } 159 160 void cb710_set_irq_handler(struct cb710_slot *slot, 161 cb710_irq_handler_t handler) 162 { 163 struct cb710_chip *chip = cb710_slot_to_chip(slot); 164 unsigned long flags; 165 166 spin_lock_irqsave(&chip->irq_lock, flags); 167 slot->irq_handler = handler; 168 spin_unlock_irqrestore(&chip->irq_lock, flags); 169 } 170 EXPORT_SYMBOL_GPL(cb710_set_irq_handler); 171 172 #ifdef CONFIG_PM 173 174 static int cb710_suspend(struct pci_dev *pdev, pm_message_t state) 175 { 176 struct cb710_chip *chip = pci_get_drvdata(pdev); 177 178 devm_free_irq(&pdev->dev, pdev->irq, chip); 179 pci_save_state(pdev); 180 pci_disable_device(pdev); 181 if (state.event & PM_EVENT_SLEEP) 182 pci_set_power_state(pdev, PCI_D3hot); 183 return 0; 184 } 185 186 static int cb710_resume(struct pci_dev *pdev) 187 { 188 struct cb710_chip *chip = pci_get_drvdata(pdev); 189 int err; 190 191 pci_set_power_state(pdev, PCI_D0); 192 pci_restore_state(pdev); 193 err = pcim_enable_device(pdev); 194 if (err) 195 return err; 196 197 return devm_request_irq(&pdev->dev, pdev->irq, 198 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip); 199 } 200 201 #endif /* CONFIG_PM */ 202 203 static int cb710_probe(struct pci_dev *pdev, 204 const struct pci_device_id *ent) 205 { 206 struct cb710_chip *chip; 207 u32 val; 208 int err; 209 int n = 0; 210 211 err = cb710_pci_configure(pdev); 212 if (err) 213 return err; 214 215 /* this is actually magic... */ 216 pci_read_config_dword(pdev, 0x48, &val); 217 if (!(val & 0x80000000)) { 218 pci_write_config_dword(pdev, 0x48, val|0x71000000); 219 pci_read_config_dword(pdev, 0x48, &val); 220 } 221 222 dev_dbg(&pdev->dev, "PCI config[0x48] = 0x%08X\n", val); 223 if (!(val & 0x70000000)) 224 return -ENODEV; 225 val = (val >> 28) & 7; 226 if (val & CB710_SLOT_MMC) 227 ++n; 228 if (val & CB710_SLOT_MS) 229 ++n; 230 if (val & CB710_SLOT_SM) 231 ++n; 232 233 chip = devm_kzalloc(&pdev->dev, struct_size(chip, slot, n), 234 GFP_KERNEL); 235 if (!chip) 236 return -ENOMEM; 237 238 err = pcim_enable_device(pdev); 239 if (err) 240 return err; 241 242 err = pcim_iomap_regions(pdev, 0x0001, KBUILD_MODNAME); 243 if (err) 244 return err; 245 246 spin_lock_init(&chip->irq_lock); 247 chip->pdev = pdev; 248 chip->iobase = pcim_iomap_table(pdev)[0]; 249 250 pci_set_drvdata(pdev, chip); 251 252 err = devm_request_irq(&pdev->dev, pdev->irq, 253 cb710_irq_handler, IRQF_SHARED, KBUILD_MODNAME, chip); 254 if (err) 255 return err; 256 257 err = ida_alloc(&cb710_ida, GFP_KERNEL); 258 if (err < 0) 259 return err; 260 chip->platform_id = err; 261 262 dev_info(&pdev->dev, "id %d, IO 0x%p, IRQ %d\n", 263 chip->platform_id, chip->iobase, pdev->irq); 264 265 if (val & CB710_SLOT_MMC) { /* MMC/SD slot */ 266 err = cb710_register_slot(chip, 267 CB710_SLOT_MMC, 0x00, "cb710-mmc"); 268 if (err) 269 return err; 270 } 271 272 if (val & CB710_SLOT_MS) { /* MemoryStick slot */ 273 err = cb710_register_slot(chip, 274 CB710_SLOT_MS, 0x40, "cb710-ms"); 275 if (err) 276 goto unreg_mmc; 277 } 278 279 if (val & CB710_SLOT_SM) { /* SmartMedia slot */ 280 err = cb710_register_slot(chip, 281 CB710_SLOT_SM, 0x60, "cb710-sm"); 282 if (err) 283 goto unreg_ms; 284 } 285 286 return 0; 287 unreg_ms: 288 cb710_unregister_slot(chip, CB710_SLOT_MS); 289 unreg_mmc: 290 cb710_unregister_slot(chip, CB710_SLOT_MMC); 291 292 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS 293 BUG_ON(atomic_read(&chip->slot_refs_count) != 0); 294 #endif 295 return err; 296 } 297 298 static void cb710_remove_one(struct pci_dev *pdev) 299 { 300 struct cb710_chip *chip = pci_get_drvdata(pdev); 301 302 cb710_unregister_slot(chip, CB710_SLOT_SM); 303 cb710_unregister_slot(chip, CB710_SLOT_MS); 304 cb710_unregister_slot(chip, CB710_SLOT_MMC); 305 #ifdef CONFIG_CB710_DEBUG_ASSUMPTIONS 306 BUG_ON(atomic_read(&chip->slot_refs_count) != 0); 307 #endif 308 309 ida_free(&cb710_ida, chip->platform_id); 310 } 311 312 static const struct pci_device_id cb710_pci_tbl[] = { 313 { PCI_VENDOR_ID_ENE, PCI_DEVICE_ID_ENE_CB710_FLASH, 314 PCI_ANY_ID, PCI_ANY_ID, }, 315 { 0, } 316 }; 317 318 static struct pci_driver cb710_driver = { 319 .name = KBUILD_MODNAME, 320 .id_table = cb710_pci_tbl, 321 .probe = cb710_probe, 322 .remove = cb710_remove_one, 323 #ifdef CONFIG_PM 324 .suspend = cb710_suspend, 325 .resume = cb710_resume, 326 #endif 327 }; 328 329 static int __init cb710_init_module(void) 330 { 331 return pci_register_driver(&cb710_driver); 332 } 333 334 static void __exit cb710_cleanup_module(void) 335 { 336 pci_unregister_driver(&cb710_driver); 337 ida_destroy(&cb710_ida); 338 } 339 340 module_init(cb710_init_module); 341 module_exit(cb710_cleanup_module); 342 343 MODULE_AUTHOR("Michał Mirosław <mirq-linux@rere.qmqm.pl>"); 344 MODULE_DESCRIPTION("ENE CB710 memory card reader driver"); 345 MODULE_LICENSE("GPL"); 346 MODULE_DEVICE_TABLE(pci, cb710_pci_tbl); 347