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https://github.com/AsahiLinux/u-boot
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199 lines
4.3 KiB
C
199 lines
4.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Amlogic Meson VPU Power Domain Controller driver
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*
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* Copyright (c) 2018 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <power-domain-uclass.h>
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#include <regmap.h>
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#include <syscon.h>
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#include <reset.h>
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#include <clk.h>
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/* AO Offsets */
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#define AO_RTI_GEN_PWR_SLEEP0 (0x3a << 2)
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#define GEN_PWR_VPU_HDMI BIT(8)
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#define GEN_PWR_VPU_HDMI_ISO BIT(9)
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/* HHI Offsets */
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#define HHI_MEM_PD_REG0 (0x40 << 2)
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#define HHI_VPU_MEM_PD_REG0 (0x41 << 2)
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#define HHI_VPU_MEM_PD_REG1 (0x42 << 2)
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struct meson_gx_pwrc_vpu_priv {
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struct regmap *regmap_ao;
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struct regmap *regmap_hhi;
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struct reset_ctl_bulk resets;
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struct clk_bulk clks;
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};
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static int meson_gx_pwrc_vpu_request(struct power_domain *power_domain)
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{
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return 0;
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}
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static int meson_gx_pwrc_vpu_free(struct power_domain *power_domain)
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{
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return 0;
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}
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static int meson_gx_pwrc_vpu_on(struct power_domain *power_domain)
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{
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struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(power_domain->dev);
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int i, ret;
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regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
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GEN_PWR_VPU_HDMI, 0);
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udelay(20);
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/* Power Up Memories */
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for (i = 0; i < 32; i += 2) {
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regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG0,
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0x3 << i, 0);
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udelay(5);
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}
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for (i = 0; i < 32; i += 2) {
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regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG1,
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0x3 << i, 0);
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udelay(5);
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}
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for (i = 8; i < 16; i++) {
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regmap_update_bits(priv->regmap_hhi, HHI_MEM_PD_REG0,
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BIT(i), 0);
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udelay(5);
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}
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udelay(20);
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ret = reset_assert_bulk(&priv->resets);
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if (ret)
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return ret;
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regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
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GEN_PWR_VPU_HDMI_ISO, 0);
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ret = reset_deassert_bulk(&priv->resets);
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if (ret)
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return ret;
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ret = clk_enable_bulk(&priv->clks);
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if (ret)
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return ret;
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return 0;
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}
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static int meson_gx_pwrc_vpu_off(struct power_domain *power_domain)
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{
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struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(power_domain->dev);
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int i;
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regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
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GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
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udelay(20);
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/* Power Down Memories */
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for (i = 0; i < 32; i += 2) {
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regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG0,
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0x3 << i, 0x3 << i);
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udelay(5);
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}
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for (i = 0; i < 32; i += 2) {
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regmap_update_bits(priv->regmap_hhi, HHI_VPU_MEM_PD_REG1,
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0x3 << i, 0x3 << i);
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udelay(5);
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}
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for (i = 8; i < 16; i++) {
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regmap_update_bits(priv->regmap_hhi, HHI_MEM_PD_REG0,
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BIT(i), BIT(i));
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udelay(5);
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}
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udelay(20);
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regmap_update_bits(priv->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
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GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
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mdelay(20);
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clk_disable_bulk(&priv->clks);
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return 0;
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}
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static int meson_gx_pwrc_vpu_of_xlate(struct power_domain *power_domain,
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struct ofnode_phandle_args *args)
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{
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/* #power-domain-cells is 0 */
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if (args->args_count != 0) {
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debug("Invalid args_count: %d\n", args->args_count);
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return -EINVAL;
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}
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return 0;
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}
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struct power_domain_ops meson_gx_pwrc_vpu_ops = {
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.free = meson_gx_pwrc_vpu_free,
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.off = meson_gx_pwrc_vpu_off,
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.on = meson_gx_pwrc_vpu_on,
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.request = meson_gx_pwrc_vpu_request,
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.of_xlate = meson_gx_pwrc_vpu_of_xlate,
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};
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static const struct udevice_id meson_gx_pwrc_vpu_ids[] = {
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{ .compatible = "amlogic,meson-gx-pwrc-vpu" },
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{ }
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};
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static int meson_gx_pwrc_vpu_probe(struct udevice *dev)
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{
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struct meson_gx_pwrc_vpu_priv *priv = dev_get_priv(dev);
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u32 hhi_phandle;
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ofnode hhi_node;
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int ret;
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priv->regmap_ao = syscon_node_to_regmap(dev_get_parent(dev)->node);
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if (IS_ERR(priv->regmap_ao))
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return PTR_ERR(priv->regmap_ao);
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ret = ofnode_read_u32(dev->node, "amlogic,hhi-sysctrl",
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&hhi_phandle);
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if (ret)
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return ret;
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hhi_node = ofnode_get_by_phandle(hhi_phandle);
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if (!ofnode_valid(hhi_node))
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return -EINVAL;
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priv->regmap_hhi = syscon_node_to_regmap(hhi_node);
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if (IS_ERR(priv->regmap_hhi))
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return PTR_ERR(priv->regmap_hhi);
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ret = reset_get_bulk(dev, &priv->resets);
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if (ret)
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return ret;
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ret = clk_get_bulk(dev, &priv->clks);
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if (ret)
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return ret;
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return 0;
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}
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U_BOOT_DRIVER(meson_gx_pwrc_vpu) = {
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.name = "meson_gx_pwrc_vpu",
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.id = UCLASS_POWER_DOMAIN,
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.of_match = meson_gx_pwrc_vpu_ids,
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.probe = meson_gx_pwrc_vpu_probe,
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.ops = &meson_gx_pwrc_vpu_ops,
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.priv_auto_alloc_size = sizeof(struct meson_gx_pwrc_vpu_priv),
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};
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