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Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
150 lines
3.4 KiB
C
150 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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i2c Support for the Apple `Hydra' Mac I/O
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Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org>
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Based on i2c Support for Via Technologies 82C586B South Bridge
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Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/types.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#include <linux/io.h>
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#include <asm/hydra.h>
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#define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */
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#define HYDRA_CPD_PD1 0x00000002
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#define HYDRA_CPD_PD2 0x00000004
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#define HYDRA_CPD_PD3 0x00000008
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#define HYDRA_SCLK HYDRA_CPD_PD0
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#define HYDRA_SDAT HYDRA_CPD_PD1
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#define HYDRA_SCLK_OE 0x00000010
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#define HYDRA_SDAT_OE 0x00000020
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static inline void pdregw(void *data, u32 val)
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{
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struct Hydra *hydra = (struct Hydra *)data;
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writel(val, &hydra->CachePD);
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}
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static inline u32 pdregr(void *data)
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{
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struct Hydra *hydra = (struct Hydra *)data;
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return readl(&hydra->CachePD);
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}
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static void hydra_bit_setscl(void *data, int state)
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{
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u32 val = pdregr(data);
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if (state)
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val &= ~HYDRA_SCLK_OE;
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else {
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val &= ~HYDRA_SCLK;
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val |= HYDRA_SCLK_OE;
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}
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pdregw(data, val);
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}
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static void hydra_bit_setsda(void *data, int state)
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{
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u32 val = pdregr(data);
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if (state)
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val &= ~HYDRA_SDAT_OE;
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else {
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val &= ~HYDRA_SDAT;
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val |= HYDRA_SDAT_OE;
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}
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pdregw(data, val);
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}
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static int hydra_bit_getscl(void *data)
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{
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return (pdregr(data) & HYDRA_SCLK) != 0;
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}
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static int hydra_bit_getsda(void *data)
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{
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return (pdregr(data) & HYDRA_SDAT) != 0;
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}
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/* ------------------------------------------------------------------------ */
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static struct i2c_algo_bit_data hydra_bit_data = {
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.setsda = hydra_bit_setsda,
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.setscl = hydra_bit_setscl,
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.getsda = hydra_bit_getsda,
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.getscl = hydra_bit_getscl,
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.udelay = 5,
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.timeout = HZ
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};
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static struct i2c_adapter hydra_adap = {
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.owner = THIS_MODULE,
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.name = "Hydra i2c",
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.algo_data = &hydra_bit_data,
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};
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static const struct pci_device_id hydra_ids[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },
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{ 0, }
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};
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MODULE_DEVICE_TABLE (pci, hydra_ids);
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static int hydra_probe(struct pci_dev *dev,
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const struct pci_device_id *id)
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{
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unsigned long base = pci_resource_start(dev, 0);
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int res;
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if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,
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hydra_adap.name))
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return -EBUSY;
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hydra_bit_data.data = pci_ioremap_bar(dev, 0);
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if (hydra_bit_data.data == NULL) {
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release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
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return -ENODEV;
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}
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pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
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hydra_adap.dev.parent = &dev->dev;
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res = i2c_bit_add_bus(&hydra_adap);
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if (res < 0) {
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iounmap(hydra_bit_data.data);
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release_mem_region(base+offsetof(struct Hydra, CachePD), 4);
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return res;
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}
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return 0;
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}
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static void hydra_remove(struct pci_dev *dev)
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{
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pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */
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i2c_del_adapter(&hydra_adap);
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iounmap(hydra_bit_data.data);
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release_mem_region(pci_resource_start(dev, 0)+
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offsetof(struct Hydra, CachePD), 4);
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}
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static struct pci_driver hydra_driver = {
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.name = "hydra_smbus",
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.id_table = hydra_ids,
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.probe = hydra_probe,
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.remove = hydra_remove,
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};
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module_pci_driver(hydra_driver);
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MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");
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MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");
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MODULE_LICENSE("GPL");
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