72 lines
2 KiB
C
Executable file
72 lines
2 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2017 Linaro Ltd.
|
|
*
|
|
* Author: Linus Walleij <linus.walleij@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/of.h>
|
|
|
|
#define GLOBAL_WORD_ID 0x00
|
|
#define GEMINI_GLOBAL_ARB1_CTRL 0x2c
|
|
#define GEMINI_ARB1_BURST_MASK GENMASK(21, 16)
|
|
#define GEMINI_ARB1_BURST_SHIFT 16
|
|
/* These all define the priority on the BUS2 backplane */
|
|
#define GEMINI_ARB1_PRIO_MASK GENMASK(9, 0)
|
|
#define GEMINI_ARB1_DMAC_HIGH_PRIO BIT(0)
|
|
#define GEMINI_ARB1_IDE_HIGH_PRIO BIT(1)
|
|
#define GEMINI_ARB1_RAID_HIGH_PRIO BIT(2)
|
|
#define GEMINI_ARB1_SECURITY_HIGH_PRIO BIT(3)
|
|
#define GEMINI_ARB1_GMAC0_HIGH_PRIO BIT(4)
|
|
#define GEMINI_ARB1_GMAC1_HIGH_PRIO BIT(5)
|
|
#define GEMINI_ARB1_USB0_HIGH_PRIO BIT(6)
|
|
#define GEMINI_ARB1_USB1_HIGH_PRIO BIT(7)
|
|
#define GEMINI_ARB1_PCI_HIGH_PRIO BIT(8)
|
|
#define GEMINI_ARB1_TVE_HIGH_PRIO BIT(9)
|
|
|
|
#define GEMINI_DEFAULT_BURST_SIZE 0x20
|
|
#define GEMINI_DEFAULT_PRIO (GEMINI_ARB1_GMAC0_HIGH_PRIO | \
|
|
GEMINI_ARB1_GMAC1_HIGH_PRIO)
|
|
|
|
static int __init gemini_soc_init(void)
|
|
{
|
|
struct regmap *map;
|
|
u32 rev;
|
|
u32 val;
|
|
int ret;
|
|
|
|
/* Multiplatform guard, only proceed on Gemini */
|
|
if (!of_machine_is_compatible("cortina,gemini"))
|
|
return 0;
|
|
|
|
map = syscon_regmap_lookup_by_compatible("cortina,gemini-syscon");
|
|
if (IS_ERR(map))
|
|
return PTR_ERR(map);
|
|
ret = regmap_read(map, GLOBAL_WORD_ID, &rev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
val = (GEMINI_DEFAULT_BURST_SIZE << GEMINI_ARB1_BURST_SHIFT) |
|
|
GEMINI_DEFAULT_PRIO;
|
|
|
|
/* Set up system arbitration */
|
|
regmap_update_bits(map,
|
|
GEMINI_GLOBAL_ARB1_CTRL,
|
|
GEMINI_ARB1_BURST_MASK | GEMINI_ARB1_PRIO_MASK,
|
|
val);
|
|
|
|
pr_info("Gemini SoC %04x revision %02x, set arbitration %08x\n",
|
|
rev >> 8, rev & 0xff, val);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(gemini_soc_init);
|