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