marduk: reset the tpm

The current version of the board has the tpm reset line connected to
a gpio. This causes security issues meaning we need a new HW spin but
to make do with what we have at least reset the tpm on boot.

Therfore have added mfio_setup_tpm function and call it as part of
tpm initialisation.

This is certainly not the best place to put this but considering the
current arch of 'pistachio_bub is king' there isn't much else we can do
without refactoring everything.

Signed-off-by: Ian Pozella <[email protected]>

Author: Ham22

board/imgtec/pistachio_bub/mfio.c

@@ -5,6 +5,7 @@
  * SPDX-License-Identifier:	GPL-2.0+
  */
 
+#include <common.h>
 #include <asm/io.h>
 #include <asm/pistachio.h>
 #include "mfio.h"
@@ -327,3 +328,16 @@ void mfio_setup_led(void)
 	pistachio_set_gpio_output_state(76, 1);
 }
 #endif
+
+#if defined(CONFIG_TARGET_PISTACHIO_MARDUK)
+void mfio_setup_tpm(void)
+{
+	/* Reset the TPM, first versions of the board
+	have the tpm reset connected to gpio 42 instead
+	of directly connected to system reset */
+	pistachio_configure_gpio(42, 1);
+	pistachio_set_gpio_output_state(42, 0);
+	udelay(100);
+	pistachio_set_gpio_output_state(42, 1);
+}
+#endif

board/imgtec/pistachio_bub/mfio.h

@@ -189,3 +189,7 @@ void mfio_setup_usb_pwr(void);
 #if defined(CONFIG_TARGET_PISTACHIO_MARDUK)
 void mfio_setup_led(void);
 #endif
+
+#if defined(CONFIG_TARGET_PISTACHIO_MARDUK)
+void mfio_setup_tpm(void);
+#endif

board/imgtec/pistachio_bub/pistachio.c

@@ -197,10 +197,17 @@ int board_early_init_f(void)
 int board_late_init(void)
 {
 #ifdef CONFIG_TPM
-	if (tpm_init() || tpm_startup(TPM_ST_CLEAR)) {
-		printf("Failed to enable tpm!\n");
+	uint32_t result;
+
+	mfio_setup_tpm();
+	udelay(10000);
+	tpm_init();
+	result = tpm_startup(TPM_ST_CLEAR);
+	if (result != 0) {
+		printf("tpm startup failed with 0x%x\n", result);
 		return 1;
 	}
+	printf("TPM:   Infineon (1.2)\n");
 #endif
 	return 0;
 }