/* i2c-hydra.c - Part of lm_sensors, Linux kernel modules for hardware monitoring i2c Support for the Apple `Hydra' Mac I/O Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org> Based on i2c Support for Via Technologies 82C586B South Bridge Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/types.h> #include <linux/i2c.h> #include <linux/i2c-algo-bit.h> #include <linux/init.h> #include <asm/io.h> #include <asm/hydra.h> #define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */ #define HYDRA_CPD_PD1 0x00000002 #define HYDRA_CPD_PD2 0x00000004 #define HYDRA_CPD_PD3 0x00000008 #define HYDRA_SCLK HYDRA_CPD_PD0 #define HYDRA_SDAT HYDRA_CPD_PD1 #define HYDRA_SCLK_OE 0x00000010 #define HYDRA_SDAT_OE 0x00000020 static inline void pdregw(void *data, u32 val) { struct Hydra *hydra = (struct Hydra *)data; writel(val, &hydra->CachePD); } static inline u32 pdregr(void *data) { struct Hydra *hydra = (struct Hydra *)data; return readl(&hydra->CachePD); } static void hydra_bit_setscl(void *data, int state) { u32 val = pdregr(data); if (state) val &= ~HYDRA_SCLK_OE; else { val &= ~HYDRA_SCLK; val |= HYDRA_SCLK_OE; } pdregw(data, val); } static void hydra_bit_setsda(void *data, int state) { u32 val = pdregr(data); if (state) val &= ~HYDRA_SDAT_OE; else { val &= ~HYDRA_SDAT; val |= HYDRA_SDAT_OE; } pdregw(data, val); } static int hydra_bit_getscl(void *data) { return (pdregr(data) & HYDRA_SCLK) != 0; } static int hydra_bit_getsda(void *data) { return (pdregr(data) & HYDRA_SDAT) != 0; } /* ------------------------------------------------------------------------ */ static struct i2c_algo_bit_data hydra_bit_data = { .setsda = hydra_bit_setsda, .setscl = hydra_bit_setscl, .getsda = hydra_bit_getsda, .getscl = hydra_bit_getscl, .udelay = 5, .timeout = HZ }; static struct i2c_adapter hydra_adap = { .owner = THIS_MODULE, .name = "Hydra i2c", .id = I2C_HW_B_HYDRA, .algo_data = &hydra_bit_data, }; static struct pci_device_id hydra_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) }, { 0, } }; MODULE_DEVICE_TABLE (pci, hydra_ids); static int __devinit hydra_probe(struct pci_dev *dev, const struct pci_device_id *id) { unsigned long base = pci_resource_start(dev, 0); int res; if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4, hydra_adap.name)) return -EBUSY; hydra_bit_data.data = ioremap(base, pci_resource_len(dev, 0)); if (hydra_bit_data.data == NULL) { release_mem_region(base+offsetof(struct Hydra, CachePD), 4); return -ENODEV; } pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ hydra_adap.dev.parent = &dev->dev; res = i2c_bit_add_bus(&hydra_adap); if (res < 0) { iounmap(hydra_bit_data.data); release_mem_region(base+offsetof(struct Hydra, CachePD), 4); return res; } return 0; } static void __devexit hydra_remove(struct pci_dev *dev) { pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */ i2c_del_adapter(&hydra_adap); iounmap(hydra_bit_data.data); release_mem_region(pci_resource_start(dev, 0)+ offsetof(struct Hydra, CachePD), 4); } static struct pci_driver hydra_driver = { .name = "hydra_smbus", .id_table = hydra_ids, .probe = hydra_probe, .remove = __devexit_p(hydra_remove), }; static int __init i2c_hydra_init(void) { return pci_register_driver(&hydra_driver); } static void __exit i2c_hydra_exit(void) { pci_unregister_driver(&hydra_driver); } MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>"); MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O"); MODULE_LICENSE("GPL"); module_init(i2c_hydra_init); module_exit(i2c_hydra_exit);