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71 lines
2.0 KiB
71 lines
2.0 KiB
// 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 <[email protected]> |
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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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