* [PATCH 1/3] soc: xilinx: decouple chip ID retrieval from direct firmware calls
2026-08-20 14:54 [PATCH 0/3] soc/board: decouple SoC identification reads from firmware calls Akshay Belsare
@ 2026-08-20 14:54 ` Akshay Belsare
2026-08-20 14:54 ` [PATCH 2/3] soc: xilinx: route PMC TAP register access through firmware Akshay Belsare
2026-08-20 14:54 ` [PATCH 3/3] board: xilinx: decouple PGGS boot index read from firmware Akshay Belsare
2 siblings, 0 replies; 4+ messages in thread
From: Akshay Belsare @ 2026-08-20 14:54 UTC (permalink / raw)
To: u-boot, michal.simek
Cc: git, padmarao.begari, Akshay Belsare, Tom Rini, Ilias Apalodimas,
Simon Glass
All four Xilinx SoC drivers contain identical
IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE) conditionals to retrieve the
chip ID. Move this logic behind xilinx_pm_get_chipid(), using a
weak default implementation for each platform and a common override
in firmware-zynqmp.c.
As part of this refactoring, move the ZynqMP weak default
implementation to mach-zynqmp/cpu.c to align with the other supported
platforms. Also declare xilinx_pm_get_chipid() in sys_proto.h instead
of zynqmp_firmware.h, as the SoC drivers no longer require direct
dependencies on firmware-specific definitions.
Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
---
arch/arm/mach-versal-net/cpu.c | 13 +++++++++++
.../mach-versal-net/include/mach/sys_proto.h | 2 ++
arch/arm/mach-versal/cpu.c | 13 +++++++++++
arch/arm/mach-versal/include/mach/sys_proto.h | 2 ++
arch/arm/mach-versal2/cpu.c | 13 +++++++++++
.../arm/mach-versal2/include/mach/sys_proto.h | 2 ++
arch/arm/mach-zynqmp/cpu.c | 8 +++++++
arch/arm/mach-zynqmp/include/mach/sys_proto.h | 2 ++
drivers/firmware/firmware-zynqmp.c | 17 ++++++++++++++
drivers/soc/soc_amd_versal2.c | 23 ++++++-------------
drivers/soc/soc_xilinx_versal.c | 23 ++++++-------------
drivers/soc/soc_xilinx_versal_net.c | 23 ++++++-------------
drivers/soc/soc_xilinx_zynqmp.c | 21 ++++++-----------
13 files changed, 100 insertions(+), 62 deletions(-)
diff --git a/arch/arm/mach-versal-net/cpu.c b/arch/arm/mach-versal-net/cpu.c
index 7df7c49ac71..54d8496a5e8 100644
--- a/arch/arm/mach-versal-net/cpu.c
+++ b/arch/arm/mach-versal-net/cpu.c
@@ -11,6 +11,7 @@
#include <malloc.h>
#include <time.h>
#include <vsprintf.h>
+#include <linux/errno.h>
#include <asm/armv8/mmu.h>
#include <asm/cache.h>
#include <asm/global_data.h>
@@ -237,6 +238,18 @@ bool soc_detection(void)
return true;
}
+__weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
+{
+ if (idcode)
+ *idcode = 0;
+
+ *version = readl(PMC_TAP_VERSION);
+ if (!*version)
+ return -EINVAL;
+
+ return 0;
+}
+
U_BOOT_DRVINFO(soc_xilinx_versal_net) = {
.name = "soc_xilinx_versal_net",
};
diff --git a/arch/arm/mach-versal-net/include/mach/sys_proto.h b/arch/arm/mach-versal-net/include/mach/sys_proto.h
index 4907dae1108..bfe9df76b0b 100644
--- a/arch/arm/mach-versal-net/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal-net/include/mach/sys_proto.h
@@ -13,3 +13,5 @@ void versal_net_timer_setup(void);
u8 versal_net_get_bootmode(void);
/* Direct MMIO read of the bootmode register (EL3 / no-firmware path) */
u32 versal_net_bootmode_reg(void);
+/* Overridable chip ID accessor: weak MMIO default, firmware override */
+int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
diff --git a/arch/arm/mach-versal/cpu.c b/arch/arm/mach-versal/cpu.c
index 7521d45bc1a..15b3303bd1c 100644
--- a/arch/arm/mach-versal/cpu.c
+++ b/arch/arm/mach-versal/cpu.c
@@ -9,6 +9,7 @@
#include <init.h>
#include <log.h>
#include <time.h>
+#include <linux/errno.h>
#include <asm/armv8/mmu.h>
#include <asm/cache.h>
#include <asm/global_data.h>
@@ -178,6 +179,18 @@ u8 __weak versal_get_bootmode(void)
return reg & BOOT_MODES_MASK;
}
+__weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
+{
+ if (idcode)
+ *idcode = 0;
+
+ *version = readl(VERSAL_PS_PMC_VERSION);
+ if (!*version)
+ return -EINVAL;
+
+ return 0;
+}
+
U_BOOT_DRVINFO(soc_xilinx_versal) = {
.name = "soc_xilinx_versal",
};
diff --git a/arch/arm/mach-versal/include/mach/sys_proto.h b/arch/arm/mach-versal/include/mach/sys_proto.h
index cb373e6fad9..bff4659eb8f 100644
--- a/arch/arm/mach-versal/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal/include/mach/sys_proto.h
@@ -27,5 +27,7 @@ u8 versal_get_bootmode(void);
u32 versal_bootmode_reg(void);
/* EL3 clock/timer register setup, called from board_early_init_r() */
void versal_timer_setup(void);
+/* Overridable chip ID accessor: weak MMIO default, firmware override */
+int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
#endif /* _ASM_ARCH_SYS_PROTO_H */
diff --git a/arch/arm/mach-versal2/cpu.c b/arch/arm/mach-versal2/cpu.c
index d72f66f4fba..fc7cdbaaa65 100644
--- a/arch/arm/mach-versal2/cpu.c
+++ b/arch/arm/mach-versal2/cpu.c
@@ -12,6 +12,7 @@
#include <time.h>
#include <vsprintf.h>
#include <wait_bit.h>
+#include <linux/errno.h>
#include <asm/armv8/mmu.h>
#include <asm/cache.h>
#include <asm/global_data.h>
@@ -310,6 +311,18 @@ bool soc_detection(void)
return true;
}
+__weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
+{
+ if (idcode)
+ *idcode = 0;
+
+ *version = readl(PMC_TAP_VERSION);
+ if (!*version)
+ return -EINVAL;
+
+ return 0;
+}
+
U_BOOT_DRVINFO(soc_amd_versal2) = {
.name = "soc_amd_versal2",
};
diff --git a/arch/arm/mach-versal2/include/mach/sys_proto.h b/arch/arm/mach-versal2/include/mach/sys_proto.h
index d678adf9c26..1a23f8dd425 100644
--- a/arch/arm/mach-versal2/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal2/include/mach/sys_proto.h
@@ -21,6 +21,8 @@ u32 versal2_multi_boot_reg(void);
u8 versal2_get_bootmode(void);
/* EL3 clock/timer register setup, called from board_early_init_r() */
void versal2_timer_setup(void);
+/* Overridable chip ID accessor: weak MMIO default, firmware override */
+int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
int zynqmp_pm_wait_mphy_tx_rx_config_ready(u32 timeout_us);
int zynqmp_pm_wait_sram_init_done(u32 timeout_us);
diff --git a/arch/arm/mach-zynqmp/cpu.c b/arch/arm/mach-zynqmp/cpu.c
index 088cc962189..c7328970fe5 100644
--- a/arch/arm/mach-zynqmp/cpu.c
+++ b/arch/arm/mach-zynqmp/cpu.c
@@ -214,6 +214,14 @@ int __weak zynqmp_mmio_read(const u32 address, u32 *value)
return -EINVAL;
}
+__weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
+{
+ if (idcode)
+ *idcode = 0;
+
+ return zynqmp_mmio_read(ZYNQMP_PS_VERSION, version);
+}
+
void zynqmp_timer_setup(void)
{
u32 val;
diff --git a/arch/arm/mach-zynqmp/include/mach/sys_proto.h b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
index d2bb10ffcbb..e791c2da74f 100644
--- a/arch/arm/mach-zynqmp/include/mach/sys_proto.h
+++ b/arch/arm/mach-zynqmp/include/mach/sys_proto.h
@@ -59,5 +59,7 @@ void zynqmp_timer_setup(void);
/* Direct MMIO accessors (EL3/SPL or no-firmware path) */
int zynqmp_mmio_rawread(const u32 address, u32 *value);
int zynqmp_mmio_rawwrite(const u32 address, const u32 mask, const u32 value);
+/* Overridable chip ID accessor: weak MMIO default, firmware override */
+int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
#endif /* _ASM_ARCH_SYS_PROTO_H */
diff --git a/drivers/firmware/firmware-zynqmp.c b/drivers/firmware/firmware-zynqmp.c
index fae66ccb3d8..ad759849fe4 100644
--- a/drivers/firmware/firmware-zynqmp.c
+++ b/drivers/firmware/firmware-zynqmp.c
@@ -175,6 +175,23 @@ unsigned int zynqmp_firmware_version(void)
return pm_api_version;
};
+int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
+{
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+ int ret;
+
+ ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0, 0, 0, ret_payload);
+ if (ret)
+ return ret;
+
+ if (idcode)
+ *idcode = ret_payload[1];
+ if (version)
+ *version = ret_payload[2];
+
+ return 0;
+}
+
#if defined(CONFIG_ARCH_VERSAL2)
/*
* Poll the M-PHY TX/RX config-ready status until it settles or @timeout_us
diff --git a/drivers/soc/soc_amd_versal2.c b/drivers/soc/soc_amd_versal2.c
index 7f06c1e70bc..d31c6deec45 100644
--- a/drivers/soc/soc_amd_versal2.c
+++ b/drivers/soc/soc_amd_versal2.c
@@ -7,9 +7,8 @@
#include <dm.h>
#include <soc.h>
-#include <zynqmp_firmware.h>
-#include <asm/io.h>
#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
#include <linux/bitfield.h>
@@ -48,23 +47,15 @@ static const struct soc_ops soc_amd_versal2_ops = {
static int soc_amd_versal2_probe(struct udevice *dev)
{
struct soc_amd_versal2_priv *priv = dev_get_priv(dev);
- u32 ret_payload[PAYLOAD_ARG_CNT];
+ u32 version;
int ret;
- priv->family = versal2_family;
-
- if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
- ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0,
- 0, 0, ret_payload);
- if (ret)
- return ret;
- } else {
- ret_payload[2] = readl(PMC_TAP_VERSION);
- if (!ret_payload[2])
- return -EINVAL;
- }
+ ret = xilinx_pm_get_chipid(NULL, &version);
+ if (ret)
+ return ret;
- priv->revision = FIELD_GET(PS_VERSION_MASK, ret_payload[2]);
+ priv->family = versal2_family;
+ priv->revision = FIELD_GET(PS_VERSION_MASK, version);
return 0;
}
diff --git a/drivers/soc/soc_xilinx_versal.c b/drivers/soc/soc_xilinx_versal.c
index c43a80df1fc..ff6eb873d8a 100644
--- a/drivers/soc/soc_xilinx_versal.c
+++ b/drivers/soc/soc_xilinx_versal.c
@@ -7,9 +7,8 @@
#include <dm.h>
#include <soc.h>
-#include <zynqmp_firmware.h>
-#include <asm/io.h>
#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
/*
* v1 -> 0x10 - ES1
@@ -44,23 +43,15 @@ static const struct soc_ops soc_xilinx_versal_ops = {
static int soc_xilinx_versal_probe(struct udevice *dev)
{
struct soc_xilinx_versal_priv *priv = dev_get_priv(dev);
- u32 ret_payload[PAYLOAD_ARG_CNT];
+ u32 version;
int ret;
- priv->family = versal_family;
-
- if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
- ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0,
- 0, 0, ret_payload);
- if (ret)
- return ret;
- } else {
- ret_payload[2] = readl(VERSAL_PS_PMC_VERSION);
- if (!ret_payload[2])
- return -EINVAL;
- }
+ ret = xilinx_pm_get_chipid(NULL, &version);
+ if (ret)
+ return ret;
- priv->revision = ret_payload[2] >> VERSAL_PS_VER_SHIFT;
+ priv->family = versal_family;
+ priv->revision = version >> VERSAL_PS_VER_SHIFT;
return 0;
}
diff --git a/drivers/soc/soc_xilinx_versal_net.c b/drivers/soc/soc_xilinx_versal_net.c
index 210f9f8f8fd..3218cc416f7 100644
--- a/drivers/soc/soc_xilinx_versal_net.c
+++ b/drivers/soc/soc_xilinx_versal_net.c
@@ -7,9 +7,8 @@
#include <dm.h>
#include <soc.h>
-#include <zynqmp_firmware.h>
-#include <asm/io.h>
#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
#include <linux/bitfield.h>
@@ -46,23 +45,15 @@ static const struct soc_ops soc_xilinx_versal_net_ops = {
static int soc_xilinx_versal_net_probe(struct udevice *dev)
{
struct soc_xilinx_versal_net_priv *priv = dev_get_priv(dev);
- u32 ret_payload[PAYLOAD_ARG_CNT];
+ u32 version;
int ret;
- priv->family = versal_family;
-
- if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
- ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0,
- 0, 0, ret_payload);
- if (ret)
- return ret;
- } else {
- ret_payload[2] = readl(PMC_TAP_VERSION);
- if (!ret_payload[2])
- return -EINVAL;
- }
+ ret = xilinx_pm_get_chipid(NULL, &version);
+ if (ret)
+ return ret;
- priv->revision = FIELD_GET(PS_VERSION_MASK, ret_payload[2]);
+ priv->family = versal_family;
+ priv->revision = FIELD_GET(PS_VERSION_MASK, version);
return 0;
}
diff --git a/drivers/soc/soc_xilinx_zynqmp.c b/drivers/soc/soc_xilinx_zynqmp.c
index 0e13e230914..1dc0b05a1a3 100644
--- a/drivers/soc/soc_xilinx_zynqmp.c
+++ b/drivers/soc/soc_xilinx_zynqmp.c
@@ -13,7 +13,6 @@
#include <dm/device_compat.h>
#include <asm/cache.h>
#include <soc.h>
-#include <zynqmp_firmware.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/hardware.h>
@@ -400,22 +399,17 @@ static const struct soc_ops soc_xilinx_zynqmp_ops = {
static int soc_xilinx_zynqmp_probe(struct udevice *dev)
{
struct soc_xilinx_zynqmp_priv *priv = dev_get_priv(dev);
- u32 ret_payload[PAYLOAD_ARG_CNT];
+ u32 idcode = 0, version;
int ret;
- priv->family = zynqmp_family;
-
- if (!IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE))
- ret = zynqmp_mmio_read(ZYNQMP_PS_VERSION, &ret_payload[2]);
- else
- ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0,
- 0, 0, ret_payload);
+ ret = xilinx_pm_get_chipid(&idcode, &version);
if (ret < 0)
return ret;
- priv->revision = ret_payload[2] & ZYNQMP_PS_VER_MASK;
+ priv->family = zynqmp_family;
+ priv->revision = version & ZYNQMP_PS_VER_MASK;
- if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE)) {
+ if (idcode) {
/*
* Firmware returns:
* payload[0][31:0] = status of the operation
@@ -424,9 +418,8 @@ static int soc_xilinx_zynqmp_probe(struct udevice *dev)
* payload[2][28:20] = EXTENDED_IDCODE
* payload[2][29] = PL_INIT
*/
- u32 idcode = ret_payload[1];
- u32 idcode2 = ret_payload[2] >>
- ZYNQMP_CSU_VERSION_EMPTY_SHIFT;
+ u32 idcode2 = version >> ZYNQMP_CSU_VERSION_EMPTY_SHIFT;
+
dev_dbg(dev, "IDCODE: 0x%0x, IDCODE2: 0x%0x\n", idcode,
idcode2);
--
2.34.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/3] soc: xilinx: route PMC TAP register access through firmware
2026-08-20 14:54 [PATCH 0/3] soc/board: decouple SoC identification reads from firmware calls Akshay Belsare
2026-08-20 14:54 ` [PATCH 1/3] soc: xilinx: decouple chip ID retrieval from direct " Akshay Belsare
@ 2026-08-20 14:54 ` Akshay Belsare
2026-08-20 14:54 ` [PATCH 3/3] board: xilinx: decouple PGGS boot index read from firmware Akshay Belsare
2 siblings, 0 replies; 4+ messages in thread
From: Akshay Belsare @ 2026-08-20 14:54 UTC (permalink / raw)
To: u-boot, michal.simek
Cc: git, padmarao.begari, Akshay Belsare, Tom Rini, Ilias Apalodimas
The Versal Net and Versal Gen 2 implementations of soc_detection()
currently access the PMC TAP IDCODE, VERSION, and USERCODE registers
directly without any firmware abstraction.
Introduce dedicated helpers for each register access:
zynqmp_pm_get_pmc_tap_idcode(),
zynqmp_pm_get_pmc_tap_version(), and
zynqmp_pm_get_pmc_tap_usercode().
Implement these helpers as weak platform defaults, with a common
firmware-backed override in firmware-zynqmp.c. The firmware
implementation accesses the registers through IOCTL_READ_REG using the
new PM_REGNODE_PMC_TAP register node, following the same mechanism used
by zynqmp_pm_get_pmc_multi_boot_reg() for PMC_GLOBAL register access.
This change removes direct PMC TAP register accesses from the SoC
detection path and provides a consistent firmware abstraction across
supported platforms.
Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
---
arch/arm/mach-versal-net/cpu.c | 21 ++++++++--
.../mach-versal-net/include/mach/sys_proto.h | 4 ++
arch/arm/mach-versal2/cpu.c | 21 ++++++++--
.../arm/mach-versal2/include/mach/sys_proto.h | 4 ++
drivers/firmware/firmware-zynqmp.c | 40 +++++++++++++++++++
include/zynqmp_firmware.h | 4 ++
6 files changed, 88 insertions(+), 6 deletions(-)
diff --git a/arch/arm/mach-versal-net/cpu.c b/arch/arm/mach-versal-net/cpu.c
index 54d8496a5e8..5ba2295e4f8 100644
--- a/arch/arm/mach-versal-net/cpu.c
+++ b/arch/arm/mach-versal-net/cpu.c
@@ -193,13 +193,13 @@ bool soc_detection(void)
{
u32 version, ps_version;
- version = readl(PMC_TAP_VERSION);
+ version = zynqmp_pm_get_pmc_tap_version();
platform_id = FIELD_GET(PLATFORM_MASK, version);
ps_version = FIELD_GET(PS_VERSION_MASK, version);
debug("idcode %x, version %x, usercode %x\n",
- readl(PMC_TAP_IDCODE), version,
- readl(PMC_TAP_USERCODE));
+ zynqmp_pm_get_pmc_tap_idcode(), version,
+ zynqmp_pm_get_pmc_tap_usercode());
debug("pmc_ver %lx, ps version %x, rtl version %lx\n",
FIELD_GET(PMC_VERSION_MASK, version),
@@ -250,6 +250,21 @@ __weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
return 0;
}
+__weak u32 zynqmp_pm_get_pmc_tap_idcode(void)
+{
+ return readl(PMC_TAP_IDCODE);
+}
+
+__weak u32 zynqmp_pm_get_pmc_tap_version(void)
+{
+ return readl(PMC_TAP_VERSION);
+}
+
+__weak u32 zynqmp_pm_get_pmc_tap_usercode(void)
+{
+ return readl(PMC_TAP_USERCODE);
+}
+
U_BOOT_DRVINFO(soc_xilinx_versal_net) = {
.name = "soc_xilinx_versal_net",
};
diff --git a/arch/arm/mach-versal-net/include/mach/sys_proto.h b/arch/arm/mach-versal-net/include/mach/sys_proto.h
index bfe9df76b0b..877a7e6a0c3 100644
--- a/arch/arm/mach-versal-net/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal-net/include/mach/sys_proto.h
@@ -15,3 +15,7 @@ u8 versal_net_get_bootmode(void);
u32 versal_net_bootmode_reg(void);
/* Overridable chip ID accessor: weak MMIO default, firmware override */
int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
+/* Overridable PMC TAP register accessors: weak MMIO default, firmware override */
+u32 zynqmp_pm_get_pmc_tap_idcode(void);
+u32 zynqmp_pm_get_pmc_tap_version(void);
+u32 zynqmp_pm_get_pmc_tap_usercode(void);
diff --git a/arch/arm/mach-versal2/cpu.c b/arch/arm/mach-versal2/cpu.c
index fc7cdbaaa65..24a02c38462 100644
--- a/arch/arm/mach-versal2/cpu.c
+++ b/arch/arm/mach-versal2/cpu.c
@@ -290,13 +290,13 @@ bool soc_detection(void)
{
u32 version, ps_version;
- version = readl(PMC_TAP_VERSION);
+ version = zynqmp_pm_get_pmc_tap_version();
platform_id = FIELD_GET(PLATFORM_MASK, version);
ps_version = FIELD_GET(PS_VERSION_MASK, version);
debug("idcode %x, version %x, usercode %x\n",
- readl(PMC_TAP_IDCODE), version,
- readl(PMC_TAP_USERCODE));
+ zynqmp_pm_get_pmc_tap_idcode(), version,
+ zynqmp_pm_get_pmc_tap_usercode());
debug("pmc_ver %lx, ps version %x, rtl version %lx\n",
FIELD_GET(PMC_VERSION_MASK, version),
@@ -323,6 +323,21 @@ __weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
return 0;
}
+__weak u32 zynqmp_pm_get_pmc_tap_idcode(void)
+{
+ return readl(PMC_TAP_IDCODE);
+}
+
+__weak u32 zynqmp_pm_get_pmc_tap_version(void)
+{
+ return readl(PMC_TAP_VERSION);
+}
+
+__weak u32 zynqmp_pm_get_pmc_tap_usercode(void)
+{
+ return readl(PMC_TAP_USERCODE);
+}
+
U_BOOT_DRVINFO(soc_amd_versal2) = {
.name = "soc_amd_versal2",
};
diff --git a/arch/arm/mach-versal2/include/mach/sys_proto.h b/arch/arm/mach-versal2/include/mach/sys_proto.h
index 1a23f8dd425..fcc2e75c89a 100644
--- a/arch/arm/mach-versal2/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal2/include/mach/sys_proto.h
@@ -23,6 +23,10 @@ u8 versal2_get_bootmode(void);
void versal2_timer_setup(void);
/* Overridable chip ID accessor: weak MMIO default, firmware override */
int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
+/* Overridable PMC TAP register accessors: weak MMIO default, firmware override */
+u32 zynqmp_pm_get_pmc_tap_idcode(void);
+u32 zynqmp_pm_get_pmc_tap_version(void);
+u32 zynqmp_pm_get_pmc_tap_usercode(void);
int zynqmp_pm_wait_mphy_tx_rx_config_ready(u32 timeout_us);
int zynqmp_pm_wait_sram_init_done(u32 timeout_us);
diff --git a/drivers/firmware/firmware-zynqmp.c b/drivers/firmware/firmware-zynqmp.c
index ad759849fe4..7a922fe544b 100644
--- a/drivers/firmware/firmware-zynqmp.c
+++ b/drivers/firmware/firmware-zynqmp.c
@@ -510,6 +510,46 @@ u32 versal2_pmc_multi_boot(void)
}
#endif
+#if defined(CONFIG_ARCH_VERSAL_NET) || defined(CONFIG_ARCH_VERSAL2)
+static u32 zynqmp_pm_get_pmc_tap_reg(u32 offset)
+{
+ int ret;
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+
+ ret = zynqmp_pm_is_function_supported(PM_IOCTL, IOCTL_READ_REG);
+ if (ret) {
+ printf("%s: IOCTL_READ_REG is not supported failed with error code: %d\n"
+ , __func__, ret);
+ return 0;
+ }
+
+ ret = xilinx_pm_request(PM_IOCTL, PM_REGNODE_PMC_TAP, IOCTL_READ_REG,
+ offset, 0, 0, 0, ret_payload);
+ if (ret) {
+ printf("%s: node 0x%x: pmc_tap offset 0x%x failed\n",
+ __func__, PM_REGNODE_PMC_TAP, offset);
+ return 0;
+ }
+
+ return ret_payload[1];
+}
+
+u32 zynqmp_pm_get_pmc_tap_idcode(void)
+{
+ return zynqmp_pm_get_pmc_tap_reg(PMC_TAP_IDCODE_OFFSET);
+}
+
+u32 zynqmp_pm_get_pmc_tap_version(void)
+{
+ return zynqmp_pm_get_pmc_tap_reg(PMC_TAP_VERSION_OFFSET);
+}
+
+u32 zynqmp_pm_get_pmc_tap_usercode(void)
+{
+ return zynqmp_pm_get_pmc_tap_reg(PMC_TAP_USERCODE_OFFSET);
+}
+#endif
+
int zynqmp_pm_feature(const u32 api_id)
{
int ret;
diff --git a/include/zynqmp_firmware.h b/include/zynqmp_firmware.h
index f753a67ac27..0293bd15a2e 100644
--- a/include/zynqmp_firmware.h
+++ b/include/zynqmp_firmware.h
@@ -533,11 +533,15 @@ extern smc_call_handler_t __data smc_call_handler;
#define PM_REGNODE_PMC_IOU_SLCR 0x30000002
#define PM_REGNODE_EFUSE_CACHE 0x30000003
+#define PM_REGNODE_PMC_TAP 0x30000005
#define PM_REG_PGGS3 0x30004003
#define SRAM_CSR_OFFSET 0x104C
#define TXRX_CFGRDY_OFFSET 0x1054
#define UFS_CAL_1_OFFSET 0xBE8
+#define PMC_TAP_IDCODE_OFFSET 0x0
+#define PMC_TAP_VERSION_OFFSET 0x4
+#define PMC_TAP_USERCODE_OFFSET 0x8
#define PMC_GLOBAL_PGGS3_REG_NODE 0x1824C005
--
2.34.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 3/3] board: xilinx: decouple PGGS boot index read from firmware
2026-08-20 14:54 [PATCH 0/3] soc/board: decouple SoC identification reads from firmware calls Akshay Belsare
2026-08-20 14:54 ` [PATCH 1/3] soc: xilinx: decouple chip ID retrieval from direct " Akshay Belsare
2026-08-20 14:54 ` [PATCH 2/3] soc: xilinx: route PMC TAP register access through firmware Akshay Belsare
@ 2026-08-20 14:54 ` Akshay Belsare
2 siblings, 0 replies; 4+ messages in thread
From: Akshay Belsare @ 2026-08-20 14:54 UTC (permalink / raw)
To: u-boot, michal.simek
Cc: git, padmarao.begari, Akshay Belsare, Tom Rini, Ilias Apalodimas
Move PGGS boot index retrieval behind a platform-specific helper
instead of selecting between firmware and direct register access in
plat_get_boot_index().
Add weak default implementations for Versal and Versal Gen 2, and cast
the register address to (ulong) before readl() to ensure correct
handling on 64-bit targets.
Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
---
arch/arm/mach-versal/cpu.c | 5 +++++
arch/arm/mach-versal/include/mach/sys_proto.h | 2 ++
arch/arm/mach-versal2/cpu.c | 5 +++++
arch/arm/mach-versal2/include/mach/sys_proto.h | 2 ++
board/xilinx/common/board.c | 6 ++----
include/zynqmp_firmware.h | 1 -
6 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/arch/arm/mach-versal/cpu.c b/arch/arm/mach-versal/cpu.c
index 15b3303bd1c..a4ee51ef0d6 100644
--- a/arch/arm/mach-versal/cpu.c
+++ b/arch/arm/mach-versal/cpu.c
@@ -191,6 +191,11 @@ __weak int xilinx_pm_get_chipid(u32 *idcode, u32 *version)
return 0;
}
+__weak u32 zynqmp_pm_get_pmc_global_pggs_reg(u32 reg_addr)
+{
+ return readl((ulong)reg_addr);
+}
+
U_BOOT_DRVINFO(soc_xilinx_versal) = {
.name = "soc_xilinx_versal",
};
diff --git a/arch/arm/mach-versal/include/mach/sys_proto.h b/arch/arm/mach-versal/include/mach/sys_proto.h
index bff4659eb8f..771b8cd8cbc 100644
--- a/arch/arm/mach-versal/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal/include/mach/sys_proto.h
@@ -29,5 +29,7 @@ u32 versal_bootmode_reg(void);
void versal_timer_setup(void);
/* Overridable chip ID accessor: weak MMIO default, firmware override */
int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
+/* Overridable PMC GLOBAL PGGS register accessor: weak MMIO default, firmware override */
+u32 zynqmp_pm_get_pmc_global_pggs_reg(u32 reg_addr);
#endif /* _ASM_ARCH_SYS_PROTO_H */
diff --git a/arch/arm/mach-versal2/cpu.c b/arch/arm/mach-versal2/cpu.c
index 24a02c38462..404250f2d44 100644
--- a/arch/arm/mach-versal2/cpu.c
+++ b/arch/arm/mach-versal2/cpu.c
@@ -338,6 +338,11 @@ __weak u32 zynqmp_pm_get_pmc_tap_usercode(void)
return readl(PMC_TAP_USERCODE);
}
+__weak u32 zynqmp_pm_get_pmc_global_pggs_reg(u32 reg_addr)
+{
+ return readl((ulong)reg_addr);
+}
+
U_BOOT_DRVINFO(soc_amd_versal2) = {
.name = "soc_amd_versal2",
};
diff --git a/arch/arm/mach-versal2/include/mach/sys_proto.h b/arch/arm/mach-versal2/include/mach/sys_proto.h
index fcc2e75c89a..64626bac24e 100644
--- a/arch/arm/mach-versal2/include/mach/sys_proto.h
+++ b/arch/arm/mach-versal2/include/mach/sys_proto.h
@@ -27,6 +27,8 @@ int xilinx_pm_get_chipid(u32 *idcode, u32 *version);
u32 zynqmp_pm_get_pmc_tap_idcode(void);
u32 zynqmp_pm_get_pmc_tap_version(void);
u32 zynqmp_pm_get_pmc_tap_usercode(void);
+/* Overridable PMC GLOBAL PGGS register accessor: weak MMIO default, firmware override */
+u32 zynqmp_pm_get_pmc_global_pggs_reg(u32 reg_addr);
int zynqmp_pm_wait_mphy_tx_rx_config_ready(u32 timeout_us);
int zynqmp_pm_wait_sram_init_done(u32 timeout_us);
diff --git a/board/xilinx/common/board.c b/board/xilinx/common/board.c
index f45b879736e..ac309ae7336 100644
--- a/board/xilinx/common/board.c
+++ b/board/xilinx/common/board.c
@@ -21,6 +21,7 @@
#include <asm/sections.h>
#if defined(CONFIG_ARCH_VERSAL) || defined(CONFIG_ARCH_VERSAL2)
#include <asm/arch/hardware.h>
+#include <asm/arch/sys_proto.h>
#endif
#include <dm/uclass.h>
#include <i2c.h>
@@ -752,10 +753,7 @@ static int plat_get_boot_index(void)
{
u32 val;
- if (IS_ENABLED(CONFIG_ZYNQMP_FIRMWARE))
- val = zynqmp_pm_get_pmc_global_pggs_reg(PMC_GLOBAL_PGGS4_REG);
- else
- val = readl(PMC_GLOBAL_PGGS4_REG);
+ val = zynqmp_pm_get_pmc_global_pggs_reg(PMC_GLOBAL_PGGS4_REG);
if (FIELD_GET(MAGIC_MASK, val) != MAGIC_NUM) {
log_err("FWU requires PMC magic number 0x%x\n", MAGIC_NUM);
diff --git a/include/zynqmp_firmware.h b/include/zynqmp_firmware.h
index 0293bd15a2e..a60d33b02ab 100644
--- a/include/zynqmp_firmware.h
+++ b/include/zynqmp_firmware.h
@@ -466,7 +466,6 @@ int zynqmp_mmio_write(const u32 address, const u32 mask, const u32 value);
int zynqmp_pm_feature(const u32 api_id);
u32 zynqmp_pm_get_bootmode_reg(void);
u32 zynqmp_pm_get_pmc_multi_boot_reg(void);
-u32 zynqmp_pm_get_pmc_global_pggs_reg(u32 reg_addr);
/* Type of Config Object */
#define PM_CONFIG_OBJECT_TYPE_BASE 0x1U
--
2.34.1
^ permalink raw reply related [flat|nested] 4+ messages in thread