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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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705e098444
Add support for dynamic detection of the UIB used (at the cost of one i2c error on the lesser-used UIB) and also provide an override via a command line parameter if needed. Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Sundar Iyer <sundar.iyer@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2010
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*
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* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
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* License terms: GNU General Public License (GPL), version 2
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*/
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#define pr_fmt(fmt) "mop500-uib: " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <mach/hardware.h>
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#include "board-mop500.h"
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enum mop500_uib {
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STUIB,
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U8500UIB,
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};
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struct uib {
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const char *name;
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const char *option;
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void (*init)(void);
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};
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static struct __initdata uib mop500_uibs[] = {
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[STUIB] = {
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.name = "ST-UIB",
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.option = "stuib",
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.init = mop500_stuib_init,
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},
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[U8500UIB] = {
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.name = "U8500-UIB",
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.option = "u8500uib",
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.init = mop500_u8500uib_init,
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},
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};
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static struct uib *mop500_uib;
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static int __init mop500_uib_setup(char *str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(mop500_uibs); i++) {
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struct uib *uib = &mop500_uibs[i];
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if (!strcmp(str, uib->option)) {
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mop500_uib = uib;
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break;
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}
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}
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if (i == ARRAY_SIZE(mop500_uibs))
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pr_err("invalid uib= option (%s)\n", str);
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return 1;
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}
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__setup("uib=", mop500_uib_setup);
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/*
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* The UIBs are detected after the I2C host controllers are registered, so
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* i2c_register_board_info() can't be used.
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*/
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void mop500_uib_i2c_add(int busnum, struct i2c_board_info *info,
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unsigned n)
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{
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struct i2c_adapter *adap;
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struct i2c_client *client;
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int i;
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adap = i2c_get_adapter(busnum);
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if (!adap) {
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pr_err("failed to get adapter i2c%d\n", busnum);
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return;
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}
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for (i = 0; i < n; i++) {
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client = i2c_new_device(adap, &info[i]);
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if (!client)
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pr_err("failed to register %s to i2c%d\n",
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info[i].type, busnum);
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}
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i2c_put_adapter(adap);
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}
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static void __init __mop500_uib_init(struct uib *uib, const char *why)
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{
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pr_info("%s (%s)\n", uib->name, why);
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uib->init();
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}
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/*
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* Detect the UIB attached based on the presence or absence of i2c devices.
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*/
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static int __init mop500_uib_init(void)
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{
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struct uib *uib = mop500_uib;
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struct i2c_adapter *i2c0;
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int ret;
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if (!cpu_is_u8500())
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return -ENODEV;
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if (uib) {
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__mop500_uib_init(uib, "from uib= boot argument");
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return 0;
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}
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i2c0 = i2c_get_adapter(0);
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if (!i2c0) {
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__mop500_uib_init(&mop500_uibs[STUIB],
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"fallback, could not get i2c0");
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return -ENODEV;
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}
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/* U8500-UIB has the TC35893 at 0x44 on I2C0, the ST-UIB doesn't. */
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ret = i2c_smbus_xfer(i2c0, 0x44, 0, I2C_SMBUS_WRITE, 0,
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I2C_SMBUS_QUICK, NULL);
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i2c_put_adapter(i2c0);
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if (ret == 0)
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uib = &mop500_uibs[U8500UIB];
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else
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uib = &mop500_uibs[STUIB];
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__mop500_uib_init(uib, "detected");
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return 0;
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}
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module_init(mop500_uib_init);
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