[PATCH v3] driver: misc: k3_avs: Add support for thermal shutdown
Udit Kumar
u-kumar1 at ti.com
Thu Oct 19 09:27:53 CEST 2023
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 at ti.com>
Signed-off-by: Neha Francis <n-francis at ti.com>
---
Change log:
Changes in v3:
- Ported only needed functionality from kernel driver to program tshut
- Removed support for temp from u-boot shell
- Appended Sign-off list
v2:https://lore.kernel.org/all/20230908172914.436194-2-u-kumar1@ti.com/
Changes in v2:
- Trying to merge AVS and kernel driver into 1
- Mark as RFC
v1 : https://lore.kernel.org/all/20230901061500.2342452-1-u-kumar1@ti.com/
drivers/misc/k3_avs.c | 104 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 104 insertions(+)
diff --git a/drivers/misc/k3_avs.c b/drivers/misc/k3_avs.c
index acfc731845..9a088244dd 100644
--- a/drivers/misc/k3_avs.c
+++ b/drivers/misc/k3_avs.c
@@ -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;
}
--
2.34.1
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