drivers/ipmi: Add IPMI KCS support in romstage

It's necessary to run IPMI commands in romstage for writing error SEL
such as memory initialization error SEL, and also for other usages
such as starting FRB2 timer, OEM commands, etc.

Add CONFIG_BMC_KCS_BASE for BMC KCS port address that can be used
across romstage and ramstage.

Change-Id: Ie3198965670454b123e570f9056673fdf515f52b
Signed-off-by: Johnny Lin <johnny_lin@wiwynn.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40234
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 112 insertions, 0 deletions

diff --git a/src/drivers/ipmi/ipmi_kcs_ops_premem.c b/src/drivers/ipmi/ipmi_kcs_ops_premem.c
new file mode 100644
index 0000000000..d799be1310
--- /dev/null
+++ b/src/drivers/ipmi/ipmi_kcs_ops_premem.c
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/pnp.h>
+#include <delay.h>
+#include <timer.h>
+
+#include "ipmi_kcs.h"
+#include "chip.h"
+
+static int ipmi_get_bmc_self_test_result(const struct device *dev,
+	struct ipmi_selftest_rsp *rsp)
+{
+	int ret;
+
+	ret = ipmi_kcs_message(dev->path.pnp.port, IPMI_NETFN_APPLICATION, 0,
+				 IPMI_BMC_GET_SELFTEST_RESULTS, NULL, 0, (u8 *)rsp,
+				 sizeof(*rsp));
+
+	if (ret < sizeof(struct ipmi_rsp) || rsp->resp.completion_code) {
+		printk(BIOS_ERR, "IPMI: %s command failed (ret=%d resp=0x%x)\n",
+		       __func__, ret, rsp->resp.completion_code);
+		return 1;
+	}
+	if (ret != sizeof(*rsp)) {
+		printk(BIOS_ERR, "IPMI: %s response truncated\n", __func__);
+		return 1;
+	}
+
+	return 0;
+}
+
+enum cb_err ipmi_kcs_premem_init(const u16 port, const u16 device)
+{
+	const struct drivers_ipmi_config *conf = NULL;
+	struct ipmi_selftest_rsp selftestrsp = {0};
+	uint8_t retry_count;
+	const struct device *dev;
+
+	/* Find IPMI PNP device from devicetree in romstage */
+	dev = dev_find_slot_pnp(port, device);
+
+	if (!dev) {
+		printk(BIOS_ERR, "IPMI: Cannot find PNP device port: %x, device %x\n",
+			port, device);
+		return CB_ERR;
+	}
+	if (!dev->enabled) {
+		printk(BIOS_ERR, "IPMI: device is not enabled\n");
+		return CB_ERR;
+	}
+	printk(BIOS_DEBUG, "IPMI: romstage PNP KCS 0x%x\n", dev->path.pnp.port);
+	if (dev->chip_info)
+		conf = dev->chip_info;
+
+	if (conf && conf->wait_for_bmc && conf->bmc_boot_timeout) {
+		struct stopwatch sw;
+		stopwatch_init_msecs_expire(&sw, conf->bmc_boot_timeout * 1000);
+		printk(BIOS_DEBUG, "IPMI: Waiting for BMC...\n");
+
+		while (!stopwatch_expired(&sw)) {
+			if (inb(dev->path.pnp.port) != 0xff)
+				break;
+			mdelay(100);
+		}
+		if (stopwatch_expired(&sw)) {
+			printk(BIOS_INFO, "IPMI: Waiting for BMC timed out\n");
+			return CB_ERR;
+		}
+	}
+
+	printk(BIOS_INFO, "Get BMC self test result...");
+	if (conf && conf->bmc_boot_timeout) {
+		for (retry_count = 0; retry_count < conf->bmc_boot_timeout; retry_count++) {
+			if (!ipmi_get_bmc_self_test_result(dev, &selftestrsp))
+				break;
+
+			mdelay(1000);
+		}
+	} else {
+		/* At least run once */
+		ipmi_get_bmc_self_test_result(dev, &selftestrsp);
+	}
+
+	int ret = CB_ERR;
+	switch (selftestrsp.result) {
+	case IPMI_APP_SELFTEST_NO_ERROR: /* 0x55 */
+		printk(BIOS_DEBUG, "No Error\n");
+		ret = CB_SUCCESS;
+		break;
+	case IPMI_APP_SELFTEST_NOT_IMPLEMENTED: /* 0x56 */
+		printk(BIOS_DEBUG, "Function Not Implemented\n");
+		ret = CB_SUCCESS;
+		break;
+	case IPMI_APP_SELFTEST_ERROR: /* 0x57 */
+		printk(BIOS_ERR, "Corrupted or inaccessible data or device\n");
+		break;
+	case IPMI_APP_SELFTEST_FATAL_HW_ERROR: /* 0x58 */
+		printk(BIOS_ERR, "Fatal Hardware Error\n");
+		break;
+	case IPMI_APP_SELFTEST_RESERVED: /* 0xFF */
+		printk(BIOS_DEBUG, "Reserved\n");
+		ret = CB_SUCCESS;
+		break;
+
+	default: /* Other Device Specific Hardware Error */
+		printk(BIOS_ERR, "Device Specific Error 0x%x 0x%x\n", selftestrsp.result,
+			selftestrsp.param);
+		break;
+	}
+	return ret;
+}