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https://github.com/AsahiLinux/u-boot
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misc: k3_avs: add driver for K3 Adaptive Voltage Scaling Class 0
Adaptive Voltage Scaling is a technology used in TI SoCs to optimize the operating voltage based on characterization data written to efuse during production. Add a driver to support this feature for K3 line of SoCs, initially for AM65x. Signed-off-by: Tero Kristo <t-kristo@ti.com> Signed-off-by: Keerthy <j-keerthy@ti.com>
This commit is contained in:
Tero Kristo
Tom Rini
parent
0be2ecd486
commit
9d233b4e3e
4 changed files with 404 additions and 0 deletions
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@ -421,4 +421,13 @@ config MICROCHIP_FLEXCOM
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Only one function can be used at a time and is chosen at boot time
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according to the device tree.
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config K3_AVS0
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depends on ARCH_K3 && SPL_DM_REGULATOR
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bool "AVS class 0 support for K3 devices"
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help
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K3 devices have the optimized voltage values for the main voltage
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domains stored in efuse within the VTM IP. This driver reads the
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optimized voltage from the efuse, so that it can be programmed
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to the PMIC on board.
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endmenu
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@ -66,3 +66,4 @@ obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress_config.o
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obj-$(CONFIG_WINBOND_W83627) += winbond_w83627.o
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obj-$(CONFIG_JZ4780_EFUSE) += jz4780_efuse.o
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obj-$(CONFIG_MICROCHIP_FLEXCOM) += microchip_flexcom.o
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obj-$(CONFIG_K3_AVS0) += k3_avs.o
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366
drivers/misc/k3_avs.c
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366
drivers/misc/k3_avs.c
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@ -0,0 +1,366 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Texas Instruments' K3 Clas 0 Adaptive Voltage Scaling driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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* Tero Kristo <t-kristo@ti.com>
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*
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <i2c.h>
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#include <k3-avs.h>
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#include <power/regulator.h>
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#define AM6_VTM_DEVINFO(i) (priv->base + 0x100 + 0x20 * (i))
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#define AM6_VTM_OPPVID_VD(i) (priv->base + 0x104 + 0x20 * (i))
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#define AM6_VTM_AVS0_SUPPORTED BIT(12)
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#define AM6_VTM_OPP_SHIFT(opp) (8 * (opp))
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#define AM6_VTM_OPP_MASK 0xff
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#define VD_FLAG_INIT_DONE BIT(0)
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struct k3_avs_privdata {
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void *base;
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struct vd_config *vd_config;
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};
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struct opp {
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u32 freq;
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u32 volt;
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};
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struct vd_data {
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int id;
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u8 opp;
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u8 flags;
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int dev_id;
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int clk_id;
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struct opp opps[NUM_OPPS];
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struct udevice *supply;
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};
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struct vd_config {
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struct vd_data *vds;
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u32 (*efuse_xlate)(struct k3_avs_privdata *priv, int idx, int opp);
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};
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static struct k3_avs_privdata *k3_avs_priv;
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/**
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* am6_efuse_voltage: read efuse voltage from VTM
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* @priv: driver private data
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* @idx: VD to read efuse for
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* @opp: opp id to read
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*
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* Reads efuse value for the specified OPP, and converts the register
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* value to a voltage. Returns the voltage in uV, or 0 if nominal voltage
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* should be used.
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*
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* Efuse val to volt conversion logic:
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*
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* val > 171 volt increments in 20mV steps with base 171 => 1.66V
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* val between 115 to 11 increments in 10mV steps with base 115 => 1.1V
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* val between 15 to 115 increments in 5mV steps with base 15 => .6V
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* val between 1 to 15 increments in 20mv steps with base 0 => .3V
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* val 0 is invalid
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*/
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static u32 am6_efuse_xlate(struct k3_avs_privdata *priv, int idx, int opp)
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{
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u32 val = readl(AM6_VTM_OPPVID_VD(idx));
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val >>= AM6_VTM_OPP_SHIFT(opp);
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val &= AM6_VTM_OPP_MASK;
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if (!val)
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return 0;
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if (val > 171)
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return 1660000 + 20000 * (val - 171);
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if (val > 115)
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return 1100000 + 10000 * (val - 115);
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if (val > 15)
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return 600000 + 5000 * (val - 15);
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return 300000 + 20000 * val;
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}
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static int k3_avs_program_voltage(struct k3_avs_privdata *priv,
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struct vd_data *vd,
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int opp_id)
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{
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u32 volt = vd->opps[opp_id].volt;
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struct vd_data *vd2;
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if (!vd->supply)
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return -ENODEV;
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vd->opp = opp_id;
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vd->flags |= VD_FLAG_INIT_DONE;
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/* Take care of ganged rails and pick the Max amongst them*/
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for (vd2 = priv->vd_config->vds; vd2->id >= 0; vd2++) {
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if (vd == vd2)
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continue;
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if (vd2->supply != vd->supply)
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continue;
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if (vd2->opps[vd2->opp].volt > volt)
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volt = vd2->opps[vd2->opp].volt;
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vd2->flags |= VD_FLAG_INIT_DONE;
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}
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return regulator_set_value(vd->supply, volt);
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}
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static struct vd_data *get_vd(struct k3_avs_privdata *priv, int idx)
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{
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struct vd_data *vd;
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for (vd = priv->vd_config->vds; vd->id >= 0 && vd->id != idx; vd++)
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;
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if (vd->id < 0)
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return NULL;
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return vd;
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}
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/**
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* k3_avs_set_opp: Sets the voltage for an arbitrary VD rail
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* @dev: AVS device
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* @vdd_id: voltage domain ID
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* @opp_id: OPP ID
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*
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* Programs the desired OPP value for the defined voltage rail. This
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* should be called from board files if reconfiguration is desired.
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* Returns 0 on success, negative error value on failure.
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*/
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int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id)
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{
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struct k3_avs_privdata *priv = dev_get_priv(dev);
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struct vd_data *vd;
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vd = get_vd(priv, vdd_id);
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if (!vd)
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return -EINVAL;
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return k3_avs_program_voltage(priv, vd, opp_id);
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}
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static int match_opp(struct vd_data *vd, u32 freq)
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{
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struct opp *opp;
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int opp_id;
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for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
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opp = &vd->opps[opp_id];
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if (opp->freq == freq)
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return opp_id;
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}
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printf("No matching OPP found for freq %d.\n", freq);
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return -EINVAL;
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}
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/**
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* k3_avs_notify_freq: Notify clock rate change towards AVS subsystem
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* @dev_id: Device ID for the clock to be changed
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* @clk_id: Clock ID for the clock to be changed
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* @freq: New frequency for clock
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*
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* Checks if the provided clock is the MPU clock or not, if not, return
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* immediately. If MPU clock is provided, maps the provided MPU frequency
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* towards an MPU OPP, and programs the voltage to the regulator. Return 0
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* on success, negative error value on failure.
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*/
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int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq)
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{
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int opp_id;
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struct k3_avs_privdata *priv = k3_avs_priv;
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struct vd_data *vd;
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for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
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if (vd->dev_id != dev_id || vd->clk_id != clk_id)
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continue;
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opp_id = match_opp(vd, freq);
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if (opp_id < 0)
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return opp_id;
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vd->opp = opp_id;
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return k3_avs_program_voltage(priv, vd, opp_id);
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}
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return -EINVAL;
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}
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static int k3_avs_configure(struct udevice *dev, struct k3_avs_privdata *priv)
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{
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struct vd_config *conf;
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int ret;
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char pname[20];
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struct vd_data *vd;
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conf = (void *)dev_get_driver_data(dev);
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priv->vd_config = conf;
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for (vd = conf->vds; vd->id >= 0; vd++) {
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sprintf(pname, "vdd-supply-%d", vd->id);
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ret = device_get_supply_regulator(dev, pname, &vd->supply);
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if (ret)
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dev_warn(dev, "supply not found for VD%d.\n", vd->id);
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sprintf(pname, "ti,default-opp-%d", vd->id);
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ret = dev_read_u32_default(dev, pname, -1);
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if (ret != -1)
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vd->opp = ret;
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}
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return 0;
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}
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/**
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* k3_avs_probe: parses VD info from VTM, and re-configures the OPP data
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*
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* Parses all VDs on a device calculating the AVS class-0 voltages for them,
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* and updates the vd_data based on this. The vd_data itself shall be used
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* to program the required OPPs later on. Returns 0 on success, negative
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* error value on failure.
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*/
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static int k3_avs_probe(struct udevice *dev)
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{
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int opp_id;
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u32 volt;
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struct opp *opp;
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struct k3_avs_privdata *priv;
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struct vd_data *vd;
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int ret;
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priv = dev_get_priv(dev);
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k3_avs_priv = priv;
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ret = k3_avs_configure(dev, priv);
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if (ret)
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return ret;
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priv->base = dev_read_addr_ptr(dev);
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if (!priv->base)
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return -ENODEV;
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for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
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if (!(readl(AM6_VTM_DEVINFO(vd->id)) &
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AM6_VTM_AVS0_SUPPORTED)) {
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dev_warn(dev, "AVS-class 0 not supported for VD%d\n",
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vd->id);
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continue;
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}
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for (opp_id = 0; opp_id < NUM_OPPS; opp_id++) {
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opp = &vd->opps[opp_id];
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if (!opp->freq)
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continue;
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volt = priv->vd_config->efuse_xlate(priv, vd->id,
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opp_id);
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if (volt)
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opp->volt = volt;
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}
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}
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for (vd = priv->vd_config->vds; vd->id >= 0; vd++) {
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if (vd->flags & VD_FLAG_INIT_DONE)
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continue;
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k3_avs_program_voltage(priv, vd, vd->opp);
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}
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return 0;
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}
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static struct vd_data am654_vd_data[] = {
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{
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.id = AM6_VDD_CORE,
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.dev_id = 82, /* AM6_DEV_CBASS0 */
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.clk_id = 0, /* main sysclk0 */
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.opp = AM6_OPP_NOM,
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.opps = {
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[AM6_OPP_NOM] = {
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.volt = 1000000,
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.freq = 250000000, /* CBASS0 */
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},
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},
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},
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{
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.id = AM6_VDD_MPU0,
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.dev_id = 202, /* AM6_DEV_COMPUTE_CLUSTER_A53_0 */
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.clk_id = 0, /* ARM clock */
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.opp = AM6_OPP_NOM,
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.opps = {
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[AM6_OPP_NOM] = {
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.volt = 1000000,
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.freq = 800000000,
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},
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[AM6_OPP_OD] = {
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.volt = 1100000,
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.freq = 1000000000,
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},
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[AM6_OPP_TURBO] = {
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.volt = 1220000,
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.freq = 1100000000,
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},
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},
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},
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{
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.id = AM6_VDD_MPU1,
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.opp = AM6_OPP_NOM,
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.dev_id = 204, /* AM6_DEV_COMPUTE_CLUSTER_A53_2 */
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.clk_id = 0, /* ARM clock */
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.opps = {
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[AM6_OPP_NOM] = {
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.volt = 1000000,
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.freq = 800000000,
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},
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[AM6_OPP_OD] = {
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.volt = 1100000,
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.freq = 1000000000,
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},
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[AM6_OPP_TURBO] = {
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.volt = 1220000,
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.freq = 1100000000,
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},
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},
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},
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{ .id = -1 },
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};
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static struct vd_config am654_vd_config = {
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.efuse_xlate = am6_efuse_xlate,
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.vds = am654_vd_data,
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};
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static const struct udevice_id k3_avs_ids[] = {
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{ .compatible = "ti,am654-avs", .data = (ulong)&am654_vd_config },
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{}
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};
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U_BOOT_DRIVER(k3_avs) = {
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.name = "k3_avs",
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.of_match = k3_avs_ids,
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.id = UCLASS_MISC,
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.probe = k3_avs_probe,
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.priv_auto_alloc_size = sizeof(struct k3_avs_privdata),
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};
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28
include/k3-avs.h
Normal file
28
include/k3-avs.h
Normal file
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@ -0,0 +1,28 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Texas Instruments' K3 Adaptive Voltage Scaling driver
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*
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* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
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* Tero Kristo <t-kristo@ti.com>
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*
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*/
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#ifndef _K3_AVS0_
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#define _K3_AVS0_
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#define AM6_VDD_WKUP 0
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#define AM6_VDD_MCU 1
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#define AM6_VDD_CORE 2
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#define AM6_VDD_MPU0 3
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#define AM6_VDD_MPU1 4
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#define NUM_OPPS 4
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#define AM6_OPP_NOM 1
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#define AM6_OPP_OD 2
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#define AM6_OPP_TURBO 3
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int k3_avs_set_opp(struct udevice *dev, int vdd_id, int opp_id);
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int k3_avs_notify_freq(int dev_id, int clk_id, u32 freq);
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#endif
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