OpenWrt – Blame information for rev 1
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Rev | Author | Line No. | Line |
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1 | office | 1 | From b0a88a861b036124ef2d6acfe6dd87cfde63e750 Mon Sep 17 00:00:00 2001 |
2 | From: Linus Walleij <linus.walleij@linaro.org> |
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3 | Date: Fri, 22 Dec 2017 00:19:08 +0100 |
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4 | Subject: [PATCH 20/31] soc: Add SoC driver for Gemini |
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5 | |||
6 | This adds an SoC driver for the Gemini. Currently there |
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7 | is only one thing not fitting into any other framework, |
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8 | and that is the bus arbitration setting. |
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9 | |||
10 | All Gemini vendor trees seem to be setting this register to |
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11 | exactly the same arbitration so we just add a small code |
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12 | snippet to do this at subsys_init() time before any other |
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13 | drivers kick in. |
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14 | |||
15 | Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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16 | Signed-off-by: Arnd Bergmann <arnd@arndb.de> |
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17 | --- |
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18 | drivers/soc/Makefile | 1 + |
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19 | drivers/soc/gemini/Makefile | 2 ++ |
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20 | drivers/soc/gemini/soc-gemini.c | 71 +++++++++++++++++++++++++++++++++++++++++ |
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21 | 3 files changed, 74 insertions(+) |
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22 | create mode 100644 drivers/soc/gemini/Makefile |
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23 | create mode 100644 drivers/soc/gemini/soc-gemini.c |
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24 | |||
25 | --- a/drivers/soc/Makefile |
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26 | +++ b/drivers/soc/Makefile |
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27 | @@ -9,6 +9,7 @@ obj-y += bcm/ |
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28 | obj-$(CONFIG_ARCH_DOVE) += dove/ |
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29 | obj-$(CONFIG_MACH_DOVE) += dove/ |
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30 | obj-y += fsl/ |
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31 | +obj-$(CONFIG_ARCH_GEMINI) += gemini/ |
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32 | obj-$(CONFIG_ARCH_MXC) += imx/ |
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33 | obj-$(CONFIG_SOC_XWAY) += lantiq/ |
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34 | obj-$(CONFIG_ARCH_MEDIATEK) += mediatek/ |
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35 | --- /dev/null |
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36 | +++ b/drivers/soc/gemini/Makefile |
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37 | @@ -0,0 +1,2 @@ |
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38 | +# SPDX-License-Identifier: GPL-2.0 |
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39 | +obj-y += soc-gemini.o |
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40 | --- /dev/null |
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41 | +++ b/drivers/soc/gemini/soc-gemini.c |
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42 | @@ -0,0 +1,71 @@ |
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43 | +// SPDX-License-Identifier: GPL-2.0 |
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44 | +/* |
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45 | + * Copyright (C) 2017 Linaro Ltd. |
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46 | + * |
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47 | + * Author: Linus Walleij <linus.walleij@linaro.org> |
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48 | + * |
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49 | + * This program is free software; you can redistribute it and/or modify |
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50 | + * it under the terms of the GNU General Public License version 2, as |
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51 | + * published by the Free Software Foundation. |
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52 | + * |
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53 | + */ |
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54 | +#include <linux/init.h> |
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55 | +#include <linux/kernel.h> |
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56 | +#include <linux/mfd/syscon.h> |
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57 | +#include <linux/regmap.h> |
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58 | +#include <linux/of.h> |
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59 | + |
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60 | +#define GLOBAL_WORD_ID 0x00 |
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61 | +#define GEMINI_GLOBAL_ARB1_CTRL 0x2c |
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62 | +#define GEMINI_ARB1_BURST_MASK GENMASK(21, 16) |
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63 | +#define GEMINI_ARB1_BURST_SHIFT 16 |
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64 | +/* These all define the priority on the BUS2 backplane */ |
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65 | +#define GEMINI_ARB1_PRIO_MASK GENMASK(9, 0) |
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66 | +#define GEMINI_ARB1_DMAC_HIGH_PRIO BIT(0) |
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67 | +#define GEMINI_ARB1_IDE_HIGH_PRIO BIT(1) |
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68 | +#define GEMINI_ARB1_RAID_HIGH_PRIO BIT(2) |
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69 | +#define GEMINI_ARB1_SECURITY_HIGH_PRIO BIT(3) |
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70 | +#define GEMINI_ARB1_GMAC0_HIGH_PRIO BIT(4) |
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71 | +#define GEMINI_ARB1_GMAC1_HIGH_PRIO BIT(5) |
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72 | +#define GEMINI_ARB1_USB0_HIGH_PRIO BIT(6) |
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73 | +#define GEMINI_ARB1_USB1_HIGH_PRIO BIT(7) |
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74 | +#define GEMINI_ARB1_PCI_HIGH_PRIO BIT(8) |
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75 | +#define GEMINI_ARB1_TVE_HIGH_PRIO BIT(9) |
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76 | + |
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77 | +#define GEMINI_DEFAULT_BURST_SIZE 0x20 |
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78 | +#define GEMINI_DEFAULT_PRIO (GEMINI_ARB1_GMAC0_HIGH_PRIO | \ |
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79 | + GEMINI_ARB1_GMAC1_HIGH_PRIO) |
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80 | + |
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81 | +static int __init gemini_soc_init(void) |
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82 | +{ |
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83 | + struct regmap *map; |
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84 | + u32 rev; |
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85 | + u32 val; |
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86 | + int ret; |
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87 | + |
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88 | + /* Multiplatform guard, only proceed on Gemini */ |
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89 | + if (!of_machine_is_compatible("cortina,gemini")) |
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90 | + return 0; |
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91 | + |
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92 | + map = syscon_regmap_lookup_by_compatible("cortina,gemini-syscon"); |
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93 | + if (IS_ERR(map)) |
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94 | + return PTR_ERR(map); |
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95 | + ret = regmap_read(map, GLOBAL_WORD_ID, &rev); |
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96 | + if (ret) |
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97 | + return ret; |
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98 | + |
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99 | + val = (GEMINI_DEFAULT_BURST_SIZE << GEMINI_ARB1_BURST_SHIFT) | |
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100 | + GEMINI_DEFAULT_PRIO; |
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101 | + |
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102 | + /* Set up system arbitration */ |
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103 | + regmap_update_bits(map, |
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104 | + GEMINI_GLOBAL_ARB1_CTRL, |
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105 | + GEMINI_ARB1_BURST_MASK | GEMINI_ARB1_PRIO_MASK, |
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106 | + val); |
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107 | + |
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108 | + pr_info("Gemini SoC %04x revision %02x, set arbitration %08x\n", |
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109 | + rev >> 8, rev & 0xff, val); |
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110 | + |
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111 | + return 0; |
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112 | +} |
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113 | +subsys_initcall(gemini_soc_init); |