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authorFurquan Shaikh <furquan@google.com>2021-04-10 14:27:16 -0700
committerMichael Niewöhner <foss@mniewoehner.de>2021-04-16 17:42:47 +0000
commitd9ce2859a3d43f27773c3e5448d6c0b65420f352 (patch)
treefb56fc661058d742800b2a208bdb50fa97837745 /src/soc
parente07532fb160e54b9ded934c3964a2cf80f5ae780 (diff)
downloadcoreboot-d9ce2859a3d43f27773c3e5448d6c0b65420f352.tar.xz
soc/intel/common/gpio: Implement GPIO snapshot/verify callbacks
This change implements `gpio_snapshot()` and `gpio_verify_snapshot()` callbacks that are useful for debugging any GPIO configuration changes across FSP-S. These can be utilized by all Intel SoCs that make use of the common block GPIO driver. Signed-off-by: Furquan Shaikh <furquan@google.com> Change-Id: I82a1f125c490b9d6e26e6e9527c2fcd55bb9d429 Reviewed-on: https://review.coreboot.org/c/coreboot/+/50990 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Diffstat (limited to 'src/soc')
-rw-r--r--src/soc/intel/common/block/gpio/Kconfig1
-rw-r--r--src/soc/intel/common/block/gpio/gpio.c85
2 files changed, 86 insertions, 0 deletions
diff --git a/src/soc/intel/common/block/gpio/Kconfig b/src/soc/intel/common/block/gpio/Kconfig
index 7e8970646f..c946545355 100644
--- a/src/soc/intel/common/block/gpio/Kconfig
+++ b/src/soc/intel/common/block/gpio/Kconfig
@@ -1,6 +1,7 @@
config SOC_INTEL_COMMON_BLOCK_GPIO
bool
select HAVE_DEBUG_GPIO
+ select HAVE_GPIO_SNAPSHOT_VERIFY_SUPPORT
help
Intel Processor common GPIO support
diff --git a/src/soc/intel/common/block/gpio/gpio.c b/src/soc/intel/common/block/gpio/gpio.c
index ca30fb5dc3..4398c9fb62 100644
--- a/src/soc/intel/common/block/gpio/gpio.c
+++ b/src/soc/intel/common/block/gpio/gpio.c
@@ -1,13 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <assert.h>
+#include <bootstate.h>
#include <console/console.h>
#include <device/device.h>
+#include <fsp/debug.h>
#include <intelblocks/gpio.h>
#include <gpio.h>
#include <intelblocks/itss.h>
#include <intelblocks/pcr.h>
#include <soc/pm.h>
+#include <stdlib.h>
#include <types.h>
#define GPIO_DWx_SIZE(x) (sizeof(uint32_t) * (x))
@@ -678,3 +681,85 @@ size_t gpio_get_index_in_group(gpio_t pad)
pin = relative_pad_in_comm(comm, pad);
return gpio_within_group(comm, pin);
}
+
+static uint32_t *snapshot;
+
+static void *allocate_snapshot_space(void)
+{
+ size_t gpio_communities, total = 0, i;
+ const struct pad_community *comm;
+
+ comm = soc_gpio_get_community(&gpio_communities);
+ for (i = 0; i < gpio_communities; i++, comm++)
+ total += comm->last_pad - comm->first_pad + 1;
+
+ if (total == 0)
+ return NULL;
+
+ return malloc(total * GPIO_NUM_PAD_CFG_REGS * sizeof(uint32_t));
+}
+
+void gpio_snapshot(void)
+{
+ size_t gpio_communities, index, i, pad, reg;
+ const struct pad_community *comm;
+ uint16_t config_offset;
+
+ if (snapshot == NULL) {
+ snapshot = allocate_snapshot_space();
+ if (snapshot == NULL)
+ return;
+ }
+
+ comm = soc_gpio_get_community(&gpio_communities);
+ for (i = 0, index = 0; i < gpio_communities; i++, comm++) {
+ for (pad = comm->first_pad; pad <= comm->last_pad; pad++) {
+ config_offset = pad_config_offset(comm, pad);
+ for (reg = 0; reg < GPIO_NUM_PAD_CFG_REGS; reg++) {
+ snapshot[index] = pcr_read32(comm->port,
+ PAD_CFG_OFFSET(config_offset, reg));
+ index++;
+ }
+ }
+ }
+}
+
+size_t gpio_verify_snapshot(void)
+{
+ size_t gpio_communities, index, i, pad, reg;
+ const struct pad_community *comm;
+ uint32_t curr_val;
+ uint16_t config_offset;
+ size_t changes = 0;
+
+ if (snapshot == NULL)
+ return 0;
+
+ comm = soc_gpio_get_community(&gpio_communities);
+ for (i = 0, index = 0; i < gpio_communities; i++, comm++) {
+ for (pad = comm->first_pad; pad <= comm->last_pad; pad++) {
+ config_offset = pad_config_offset(comm, pad);
+ for (reg = 0; reg < GPIO_NUM_PAD_CFG_REGS; reg++) {
+ curr_val = pcr_read32(comm->port,
+ PAD_CFG_OFFSET(config_offset, reg));
+ if (curr_val != snapshot[index]) {
+ printk(BIOS_SPEW,
+ "%zd(DW%zd): Changed from 0x%x to 0x%x\n",
+ pad, reg, snapshot[index], curr_val);
+ changes++;
+ }
+ index++;
+ }
+ }
+ }
+
+ return changes;
+}
+
+static void snapshot_cleanup(void *unused)
+{
+ free(snapshot);
+}
+
+BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_EXIT, snapshot_cleanup, NULL);
+BOOT_STATE_INIT_ENTRY(BS_PAYLOAD_LOAD, BS_ON_EXIT, snapshot_cleanup, NULL);