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The General Register Files are an area of registers containing a lot of single-bit settings for numerous components as well full components like usbphy control. Therefore all used components are accessed via the syscon provided by the grf nodes or from the sub-devices created through the simple-mfd created from the grf node. Some settings are not used by anything but will need to be set up according to expectations on the kernel side. Best example is the force_jtag setting, which defaults to on and results in the soc switching the pin-outputs between jtag and sdmmc automatically depending on the card-detect status. This conflicts heavily with how the dw_mmc driver expects to do its work and also with the clock-controller, which has most likely deactivated the jtag clock due to it being unused. So far the handling of this setting was living in the mach-rockchip code for the arm32-based rk3288 but that of course doesn't work for arm64 socs and would also look ugly for further arm32 socs. Also always disabling this setting is quite specific to linux and its subsystems, other operating systems might prefer other settings, so that the bootloader cannot really set a sane default for all. So introduce a top-level driver for the grf that handles these settings that need to be a certain way but nobody cares about. Other needed settings might surface in the future and can then be added here, but only as a last option. Ideally general GRF settings should be handled in the driver needing them. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Reviewed-by: Douglas Anderson <dianders@chromium.org>
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
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* Rockchip Generic Register Files setup
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*
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* Copyright (c) 2016 Heiko Stuebner <heiko@sntech.de>
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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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#include <linux/err.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#define HIWORD_UPDATE(val, mask, shift) \
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((val) << (shift) | (mask) << ((shift) + 16))
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struct rockchip_grf_value {
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const char *desc;
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u32 reg;
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u32 val;
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};
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struct rockchip_grf_info {
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const struct rockchip_grf_value *values;
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int num_values;
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};
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#define RK3036_GRF_SOC_CON0 0x140
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static const struct rockchip_grf_value rk3036_defaults[] __initconst = {
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/*
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* Disable auto jtag/sdmmc switching that causes issues with the
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* clock-framework and the mmc controllers making them unreliable.
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*/
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{ "jtag switching", RK3036_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 11) },
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};
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static const struct rockchip_grf_info rk3036_grf __initconst = {
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.values = rk3036_defaults,
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.num_values = ARRAY_SIZE(rk3036_defaults),
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};
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#define RK3288_GRF_SOC_CON0 0x244
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static const struct rockchip_grf_value rk3288_defaults[] __initconst = {
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{ "jtag switching", RK3288_GRF_SOC_CON0, HIWORD_UPDATE(0, 1, 12) },
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};
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static const struct rockchip_grf_info rk3288_grf __initconst = {
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.values = rk3288_defaults,
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.num_values = ARRAY_SIZE(rk3288_defaults),
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};
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#define RK3368_GRF_SOC_CON15 0x43c
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static const struct rockchip_grf_value rk3368_defaults[] __initconst = {
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{ "jtag switching", RK3368_GRF_SOC_CON15, HIWORD_UPDATE(0, 1, 13) },
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};
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static const struct rockchip_grf_info rk3368_grf __initconst = {
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.values = rk3368_defaults,
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.num_values = ARRAY_SIZE(rk3368_defaults),
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};
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#define RK3399_GRF_SOC_CON7 0xe21c
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static const struct rockchip_grf_value rk3399_defaults[] __initconst = {
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{ "jtag switching", RK3399_GRF_SOC_CON7, HIWORD_UPDATE(0, 1, 12) },
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};
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static const struct rockchip_grf_info rk3399_grf __initconst = {
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.values = rk3399_defaults,
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.num_values = ARRAY_SIZE(rk3399_defaults),
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};
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static const struct of_device_id rockchip_grf_dt_match[] __initconst = {
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{
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.compatible = "rockchip,rk3036-grf",
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.data = (void *)&rk3036_grf,
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}, {
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.compatible = "rockchip,rk3288-grf",
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.data = (void *)&rk3288_grf,
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}, {
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.compatible = "rockchip,rk3368-grf",
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.data = (void *)&rk3368_grf,
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}, {
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.compatible = "rockchip,rk3399-grf",
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.data = (void *)&rk3399_grf,
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},
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{ /* sentinel */ },
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};
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static int __init rockchip_grf_init(void)
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{
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const struct rockchip_grf_info *grf_info;
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const struct of_device_id *match;
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struct device_node *np;
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struct regmap *grf;
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int ret, i;
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np = of_find_matching_node_and_match(NULL, rockchip_grf_dt_match,
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&match);
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if (!np)
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return -ENODEV;
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if (!match || !match->data) {
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pr_err("%s: missing grf data\n", __func__);
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return -EINVAL;
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}
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grf_info = match->data;
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grf = syscon_node_to_regmap(np);
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if (IS_ERR(grf)) {
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pr_err("%s: could not get grf syscon\n", __func__);
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return PTR_ERR(grf);
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}
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for (i = 0; i < grf_info->num_values; i++) {
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const struct rockchip_grf_value *val = &grf_info->values[i];
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pr_debug("%s: adjusting %s in %#6x to %#10x\n", __func__,
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val->desc, val->reg, val->val);
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ret = regmap_write(grf, val->reg, val->val);
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if (ret < 0)
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pr_err("%s: write to %#6x failed with %d\n",
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__func__, val->reg, ret);
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}
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return 0;
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}
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postcore_initcall(rockchip_grf_init);
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