151 lines
3.4 KiB
C
151 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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