Mirrors/u-boot
2
0
Fork 0
mirror of https://github.com/AsahiLinux/u-boot synced 2025-02-17 22:49:02 +00:00
Code Issues Projects Releases Packages Wiki Activity

driver: misc: k3_avs: Add support for thermal shutdown

Browse source 
To avoid thermal burn out, program thermal shutdown
value in VTM (Voltage and Thermal Manager) IP.

Part of Linux kernel driver (drivers/thermal/k3_j72xx_bandgap.c)
is ported from kernel 6.6-rc1, which sets thermal shutdown values.

Signed-off-by: Udit Kumar <u-kumar1@ti.com>
Signed-off-by: Neha Francis <n-francis@ti.com>
This commit is contained in:
Udit Kumar 2023-10-19 12:57:53 +05:30 • committed by Tom Rini
parent 86a5741c34
commit b254975b1a
1 changed files with 104 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

104
drivers/misc/k3_avs.c
View file

@ -15,6 +15,7 @@
#include <k3-avs.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <power/regulator.h>
#define AM6_VTM_DEVINFO(i) (priv->base + 0x100 + 0x20 * (i))
@ -25,11 +26,28 @@
#define AM6_VTM_OPP_SHIFT(opp) (8 * (opp))
#define AM6_VTM_OPP_MASK 0xff
#define K3_VTM_DEVINFO_PWR0_OFFSET 0x4
#define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK 0xf0
#define K3_VTM_TMPSENS0_CTRL_OFFSET 0x300
#define K3_VTM_TMPSENS_STAT_OFFSET 0x8
#define K3_VTM_ANYMAXT_OUTRG_ALERT_EN 0x1
#define K3_VTM_LOW_TEMP_OFFSET 0x10
#define K3_VTM_MISC_CTRL2_OFFSET 0x10
#define K3_VTM_MISC_CTRL1_OFFSET 0xc
#define K3_VTM_TMPSENS_CTRL1_SOC BIT(5)
#define K3_VTM_TMPSENS_CTRL_CLRZ BIT(6)
#define K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN BIT(11)
#define K3_VTM_ADC_COUNT_FOR_123C 0x2f8
#define K3_VTM_ADC_COUNT_FOR_105C 0x288
#define K3_VTM_ADC_WA_VALUE 0x2c
#define K3_VTM_FUSE_MASK 0xc0000000
#define VD_FLAG_INIT_DONE BIT(0)
struct k3_avs_privdata {
void *base;
struct vd_config *vd_config;
struct udevice *dev;
};
struct opp {
@ -237,6 +255,88 @@ static int k3_avs_configure(struct udevice *dev, struct k3_avs_privdata *priv)
return 0;
}
/* k3_avs_program_tshut : Program thermal shutdown value for SOC
* set the values corresponding to thresholds to ~123C and 105C
* This is optional feature, Few times OS driver takes care of
* tshut programing.
*/
static void k3_avs_program_tshut(struct k3_avs_privdata *priv)
{
int cnt, id, val;
int workaround_needed = 0;
u32 ctrl_offset;
void __iomem *cfg2_base;
void __iomem *fuse_base;
cfg2_base = (void __iomem *)devfdt_get_addr_index(priv->dev, 1);
if (IS_ERR(cfg2_base)) {
dev_err(priv->dev, "cfg base is not defined\n");
return;
}
/*
* Some of TI's J721E SoCs require a software trimming procedure
* for the temperature monitors to function properly. To determine
* if this particular SoC is NOT affected, both bits in the
* WKUP_SPARE_FUSE0[31:30] will be set (0xC0000000) indicating
* when software trimming should NOT be applied.
*
* https://www.ti.com/lit/er/sprz455c/sprz455c.pdf
* This routine checks if workaround_needed to be applied or not
* based upon workaround_needed, adjust fixed value of tshut high and low
*/
if (device_is_compatible(priv->dev, "ti,j721e-vtm")) {
fuse_base = (void __iomem *)devfdt_get_addr_index(priv->dev, 2);
if (IS_ERR(fuse_base)) {
dev_err(priv->dev, "fuse-base is not defined for J721E Soc\n");
return;
}
if (!((readl(fuse_base) & K3_VTM_FUSE_MASK) == K3_VTM_FUSE_MASK))
workaround_needed = 1;
}
dev_dbg(priv->dev, "Work around %sneeded\n", workaround_needed ? "" : "not ");
/* Get the sensor count in the VTM */
val = readl(priv->base + K3_VTM_DEVINFO_PWR0_OFFSET);
cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
/* Program the thermal sensors */
for (id = 0; id < cnt; id++) {
ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET + id * 0x20;
val = readl(cfg2_base + ctrl_offset);
val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN |
K3_VTM_TMPSENS_CTRL1_SOC |
K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4));
writel(val, cfg2_base + ctrl_offset);
}
/*
* Program TSHUT thresholds
* Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2
* Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit
* This is already taken care as per of init
* Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit
*/
/* Low thresholds for tshut*/
val = (K3_VTM_ADC_COUNT_FOR_105C - workaround_needed * K3_VTM_ADC_WA_VALUE)
<< K3_VTM_LOW_TEMP_OFFSET;
/* high thresholds */
val |= K3_VTM_ADC_COUNT_FOR_123C - workaround_needed * K3_VTM_ADC_WA_VALUE;
writel(val, cfg2_base + K3_VTM_MISC_CTRL2_OFFSET);
/* ramp-up delay from Linux code */
mdelay(100);
val = readl(cfg2_base + K3_VTM_MISC_CTRL1_OFFSET) | K3_VTM_ANYMAXT_OUTRG_ALERT_EN;
writel(val, cfg2_base + K3_VTM_MISC_CTRL1_OFFSET);
}
/**
* k3_avs_probe: parses VD info from VTM, and re-configures the OPP data
*
@ -255,6 +355,7 @@ static int k3_avs_probe(struct udevice *dev)
int ret;
priv = dev_get_priv(dev);
priv->dev = dev;
k3_avs_priv = priv;
@ -294,6 +395,9 @@ static int k3_avs_probe(struct udevice *dev)
k3_avs_program_voltage(priv, vd, vd->opp);
}
if (!device_is_compatible(priv->dev, "ti,am654-avs"))
k3_avs_program_tshut(priv);
return 0;
}