amd/pi/hudson: Add GPIO get function

Add a basic GPIO get function.

Note that GPIO set, ACPI/GPE, and other features should come
in future commits. Future changes to be modeled on the other soc/
gpio functions.

Change-Id: I8f681865715ab947b525320a6f9fc63af1334b59
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/19159
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

3 files changed, 162 insertions, 0 deletions

diff --git a/src/southbridge/amd/pi/hudson/Makefile.inc b/src/southbridge/amd/pi/hudson/Makefile.inc
index 5f5b1c8c37..f6d7305c0c 100644
--- a/src/southbridge/amd/pi/hudson/Makefile.inc
+++ b/src/southbridge/amd/pi/hudson/Makefile.inc
@@ -39,6 +39,7 @@ ramstage-y += hda.c
 ramstage-y += pci.c
 ramstage-y += pcie.c
 ramstage-y += sd.c
+ramstage-$(CONFIG_SOUTHBRIDGE_AMD_PI_KERN) += gpio.c
 
 ramstage-$(CONFIG_HAVE_ACPI_TABLES) += fadt.c
 ramstage-y += reset.c
diff --git a/src/southbridge/amd/pi/hudson/gpio.c b/src/southbridge/amd/pi/hudson/gpio.c
new file mode 100644
index 0000000000..5b2eb4c161
--- /dev/null
+++ b/src/southbridge/amd/pi/hudson/gpio.c
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2015 Google Inc.
+ * Copyright (C) 2015 Intel Corporation
+ * Copyright (C) 2017 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include "gpio.h"
+
+int gpio_get(gpio_t gpio_num)
+{
+	uint32_t reg;
+
+	reg = read32((void*)(uintptr_t)gpio_num);
+
+	return !!(reg & GPIO_PIN_STS);
+}
diff --git a/src/southbridge/amd/pi/hudson/gpio.h b/src/southbridge/amd/pi/hudson/gpio.h
new file mode 100644
index 0000000000..3863ed2080
--- /dev/null
+++ b/src/southbridge/amd/pi/hudson/gpio.h
@@ -0,0 +1,133 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _HUDSON_GPIO_H_
+#define _HUDSON_GPIO_H_
+
+#include <southbridge/amd/common/amd_defs.h>
+#include <types.h>
+
+#define CROS_GPIO_DEVICE_NAME "AmdKern"
+
+#define GPIO_PIN_STS		(1 << 16)
+#define GPIO_OUTPUT_VALUE	(1 << 22)
+#define GPIO_OUTPUT_ENABLE	(1 << 23)
+
+#if IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_PI_KERN)
+/* GPIO_0 - GPIO_62 */
+#define GPIO_BANK0_CONTROL (AMD_SB_ACPI_MMIO_ADDR + 0x1500)
+#define   GPIO_0	(GPIO_BANK0_CONTROL + 0x00)
+#define   GPIO_1	(GPIO_BANK0_CONTROL + 0x04)
+#define   GPIO_2	(GPIO_BANK0_CONTROL + 0x08)
+#define   GPIO_3	(GPIO_BANK0_CONTROL + 0x0C)
+#define   GPIO_4	(GPIO_BANK0_CONTROL + 0x10)
+#define   GPIO_5	(GPIO_BANK0_CONTROL + 0x14)
+#define   GPIO_6	(GPIO_BANK0_CONTROL + 0x18)
+#define   GPIO_7	(GPIO_BANK0_CONTROL + 0x1C)
+#define   GPIO_8	(GPIO_BANK0_CONTROL + 0x20)
+#define   GPIO_9	(GPIO_BANK0_CONTROL + 0x24)
+#define   GPIO_10	(GPIO_BANK0_CONTROL + 0x28)
+#define   GPIO_11	(GPIO_BANK0_CONTROL + 0x2C)
+#define   GPIO_12	(GPIO_BANK0_CONTROL + 0x30)
+#define   GPIO_13	(GPIO_BANK0_CONTROL + 0x34)
+#define   GPIO_14	(GPIO_BANK0_CONTROL + 0x38)
+#define   GPIO_15	(GPIO_BANK0_CONTROL + 0x3C)
+#define   GPIO_16	(GPIO_BANK0_CONTROL + 0x40)
+#define   GPIO_17	(GPIO_BANK0_CONTROL + 0x44)
+#define   GPIO_18	(GPIO_BANK0_CONTROL + 0x48)
+#define   GPIO_19	(GPIO_BANK0_CONTROL + 0x4C)
+#define   GPIO_20	(GPIO_BANK0_CONTROL + 0x50)
+#define   GPIO_21	(GPIO_BANK0_CONTROL + 0x54)
+#define   GPIO_22	(GPIO_BANK0_CONTROL + 0x58)
+#define   GPIO_23	(GPIO_BANK0_CONTROL + 0x5C)
+#define   GPIO_24	(GPIO_BANK0_CONTROL + 0x60)
+#define   GPIO_25	(GPIO_BANK0_CONTROL + 0x64)
+#define   GPIO_26	(GPIO_BANK0_CONTROL + 0x68)
+#define   GPIO_39	(GPIO_BANK0_CONTROL + 0x9C)
+#define   GPIO_42	(GPIO_BANK0_CONTROL + 0xA8)
+
+/* GPIO_64 - GPIO_127 */
+#define GPIO_BANK1 (CONTROL AMD_SB_ACPI_MMIO_ADDR + 0x1600)
+#define   GPIO_64	(GPIO_BANK1_CONTROL + 0x00)
+#define   GPIO_65	(GPIO_BANK1_CONTROL + 0x04)
+#define   GPIO_66	(GPIO_BANK1_CONTROL + 0x08)
+#define   GPIO_67	(GPIO_BANK1_CONTROL + 0x0C)
+#define   GPIO_68	(GPIO_BANK1_CONTROL + 0x10)
+#define   GPIO_69	(GPIO_BANK1_CONTROL + 0x14)
+#define   GPIO_70	(GPIO_BANK1_CONTROL + 0x18)
+#define   GPIO_71	(GPIO_BANK1_CONTROL + 0x1C)
+#define   GPIO_72	(GPIO_BANK1_CONTROL + 0x20)
+#define   GPIO_74	(GPIO_BANK1_CONTROL + 0x28)
+#define   GPIO_75	(GPIO_BANK1_CONTROL + 0x2C)
+#define   GPIO_76	(GPIO_BANK1_CONTROL + 0x30)
+#define   GPIO_84	(GPIO_BANK1_CONTROL + 0x50)
+#define   GPIO_85	(GPIO_BANK1_CONTROL + 0x54)
+#define   GPIO_86	(GPIO_BANK1_CONTROL + 0x58)
+#define   GPIO_87	(GPIO_BANK1_CONTROL + 0x5C)
+#define   GPIO_88	(GPIO_BANK1_CONTROL + 0x60)
+#define   GPIO_89	(GPIO_BANK1_CONTROL + 0x64)
+#define   GPIO_90	(GPIO_BANK1_CONTROL + 0x68)
+#define   GPIO_91	(GPIO_BANK1_CONTROL + 0x6C)
+#define   GPIO_92	(GPIO_BANK1_CONTROL + 0x70)
+#define   GPIO_93	(GPIO_BANK1_CONTROL + 0x74)
+#define   GPIO_95	(GPIO_BANK1_CONTROL + 0x7C)
+#define   GPIO_96	(GPIO_BANK1_CONTROL + 0x80)
+#define   GPIO_97	(GPIO_BANK1_CONTROL + 0x84)
+#define   GPIO_98	(GPIO_BANK1_CONTROL + 0x88)
+#define   GPIO_99	(GPIO_BANK1_CONTROL + 0x8C)
+#define   GPIO_100	(GPIO_BANK1_CONTROL + 0x90)
+#define   GPIO_101	(GPIO_BANK1_CONTROL + 0x94)
+#define   GPIO_102	(GPIO_BANK1_CONTROL + 0x98)
+#define   GPIO_113	(GPIO_BANK1_CONTROL + 0xC4)
+#define   GPIO_114	(GPIO_BANK1_CONTROL + 0xC8)
+#define   GPIO_115	(GPIO_BANK1_CONTROL + 0xCC)
+#define   GPIO_116	(GPIO_BANK1_CONTROL + 0xD0)
+#define   GPIO_117	(GPIO_BANK1_CONTROL + 0xD4)
+#define   GPIO_118	(GPIO_BANK1_CONTROL + 0xD8)
+#define   GPIO_119	(GPIO_BANK1_CONTROL + 0xDC)
+#define   GPIO_120	(GPIO_BANK1_CONTROL + 0xE0)
+#define   GPIO_121	(GPIO_BANK1_CONTROL + 0xE4)
+#define   GPIO_122	(GPIO_BANK1_CONTROL + 0xE8)
+#define   GPIO_126	(GPIO_BANK1_CONTROL + 0xF8)
+
+/* GPIO_128 - GPIO_183 */
+#define GPIO_BANK2_CONTROL (AMD_SB_ACPI_MMIO_ADDR + 0x1700)
+#define   GPIO_129	(GPIO_BANK2_CONTROL + 0x04)
+#define   GPIO_130	(GPIO_BANK2_CONTROL + 0x08)
+#define   GPIO_131	(GPIO_BANK2_CONTROL + 0x0C)
+#define   GPIO_132	(GPIO_BANK2_CONTROL + 0x10)
+#define   GPIO_133	(GPIO_BANK2_CONTROL + 0x14)
+#define   GPIO_134	(GPIO_BANK2_CONTROL + 0x18)
+#define   GPIO_135	(GPIO_BANK2_CONTROL + 0x1C)
+#define   GPIO_136	(GPIO_BANK2_CONTROL + 0x20)
+#define   GPIO_137	(GPIO_BANK2_CONTROL + 0x24)
+#define   GPIO_138	(GPIO_BANK2_CONTROL + 0x28)
+#define   GPIO_139	(GPIO_BANK2_CONTROL + 0x2C)
+#define   GPIO_140	(GPIO_BANK2_CONTROL + 0x30)
+#define   GPIO_141	(GPIO_BANK2_CONTROL + 0x34)
+#define   GPIO_142	(GPIO_BANK2_CONTROL + 0x38)
+#define   GPIO_143	(GPIO_BANK2_CONTROL + 0x3C)
+#define   GPIO_144	(GPIO_BANK2_CONTROL + 0x40)
+#define   GPIO_145	(GPIO_BANK2_CONTROL + 0x44)
+#define   GPIO_146	(GPIO_BANK2_CONTROL + 0x48)
+#define   GPIO_147	(GPIO_BANK2_CONTROL + 0x4C)
+#define   GPIO_148	(GPIO_BANK2_CONTROL + 0x50)
+#endif	/* IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_PI_KERN) */
+
+typedef uint32_t gpio_t;
+
+int gpio_get(gpio_t gpio_num);
+
+#endif	/* _HUDSON_GPIO_H_ */