151 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 i2c Support for the Apple `Hydra' Mac I/O4 5 Copyright (c) 1999-2004 Geert Uytterhoeven <geert@linux-m68k.org>6 7 Based on i2c Support for Via Technologies 82C586B South Bridge8 Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi>9 10*/11 12#include <linux/kernel.h>13#include <linux/module.h>14#include <linux/pci.h>15#include <linux/types.h>16#include <linux/i2c.h>17#include <linux/i2c-algo-bit.h>18#include <linux/io.h>19#include <asm/hydra.h>20 21 22#define HYDRA_CPD_PD0 0x00000001 /* CachePD lines */23#define HYDRA_CPD_PD1 0x0000000224#define HYDRA_CPD_PD2 0x0000000425#define HYDRA_CPD_PD3 0x0000000826 27#define HYDRA_SCLK HYDRA_CPD_PD028#define HYDRA_SDAT HYDRA_CPD_PD129#define HYDRA_SCLK_OE 0x0000001030#define HYDRA_SDAT_OE 0x0000002031 32static inline void pdregw(void *data, u32 val)33{34 struct Hydra *hydra = (struct Hydra *)data;35 writel(val, &hydra->CachePD);36}37 38static inline u32 pdregr(void *data)39{40 struct Hydra *hydra = (struct Hydra *)data;41 return readl(&hydra->CachePD);42}43 44static void hydra_bit_setscl(void *data, int state)45{46 u32 val = pdregr(data);47 if (state)48 val &= ~HYDRA_SCLK_OE;49 else {50 val &= ~HYDRA_SCLK;51 val |= HYDRA_SCLK_OE;52 }53 pdregw(data, val);54}55 56static void hydra_bit_setsda(void *data, int state)57{58 u32 val = pdregr(data);59 if (state)60 val &= ~HYDRA_SDAT_OE;61 else {62 val &= ~HYDRA_SDAT;63 val |= HYDRA_SDAT_OE;64 }65 pdregw(data, val);66}67 68static int hydra_bit_getscl(void *data)69{70 return (pdregr(data) & HYDRA_SCLK) != 0;71}72 73static int hydra_bit_getsda(void *data)74{75 return (pdregr(data) & HYDRA_SDAT) != 0;76}77 78/* ------------------------------------------------------------------------ */79 80static struct i2c_algo_bit_data hydra_bit_data = {81 .setsda = hydra_bit_setsda,82 .setscl = hydra_bit_setscl,83 .getsda = hydra_bit_getsda,84 .getscl = hydra_bit_getscl,85 .udelay = 5,86 .timeout = HZ87};88 89static struct i2c_adapter hydra_adap = {90 .owner = THIS_MODULE,91 .name = "Hydra i2c",92 .algo_data = &hydra_bit_data,93};94 95static const struct pci_device_id hydra_ids[] = {96 { PCI_DEVICE(PCI_VENDOR_ID_APPLE, PCI_DEVICE_ID_APPLE_HYDRA) },97 { 0, }98};99 100MODULE_DEVICE_TABLE (pci, hydra_ids);101 102static int hydra_probe(struct pci_dev *dev,103 const struct pci_device_id *id)104{105 unsigned long base = pci_resource_start(dev, 0);106 int res;107 108 if (!request_mem_region(base+offsetof(struct Hydra, CachePD), 4,109 hydra_adap.name))110 return -EBUSY;111 112 hydra_bit_data.data = pci_ioremap_bar(dev, 0);113 if (hydra_bit_data.data == NULL) {114 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);115 return -ENODEV;116 }117 118 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */119 hydra_adap.dev.parent = &dev->dev;120 res = i2c_bit_add_bus(&hydra_adap);121 if (res < 0) {122 iounmap(hydra_bit_data.data);123 release_mem_region(base+offsetof(struct Hydra, CachePD), 4);124 return res;125 }126 return 0;127}128 129static void hydra_remove(struct pci_dev *dev)130{131 pdregw(hydra_bit_data.data, 0); /* clear SCLK_OE and SDAT_OE */132 i2c_del_adapter(&hydra_adap);133 iounmap(hydra_bit_data.data);134 release_mem_region(pci_resource_start(dev, 0)+135 offsetof(struct Hydra, CachePD), 4);136}137 138 139static struct pci_driver hydra_driver = {140 .name = "hydra_smbus",141 .id_table = hydra_ids,142 .probe = hydra_probe,143 .remove = hydra_remove,144};145 146module_pci_driver(hydra_driver);147 148MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");149MODULE_DESCRIPTION("i2c for Apple Hydra Mac I/O");150MODULE_LICENSE("GPL");151