soc/amd/stoneyridge/southbridge.c: Create a GPIO programming function

Create a GPIO programming function that can be called from multiple
stages (bootblock, romstage and ramstage) that will program only the
GPIO specific to the particular stage.

Add dummy table to kahlee, grunt and gardenia to be able to test a build.

BUG=b:64140392
TEST=Build kahlee, grunt and gardenia with GPIO programming call at
bootblock. This call is removed before commit, so bootblock.c is not
committed.

Change-Id: I88d65c78a186bed9739bc208d5711a31aa3c3bb6
Signed-off-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Reviewed-on: https://review.coreboot.org/22986
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

4 files changed, 67 insertions, 1 deletions

diff --git a/src/soc/amd/stoneyridge/include/soc/gpio.h b/src/soc/amd/stoneyridge/include/soc/gpio.h
index b3dddd4ed7..84a4e84a17 100644
--- a/src/soc/amd/stoneyridge/include/soc/gpio.h
+++ b/src/soc/amd/stoneyridge/include/soc/gpio.h
@@ -30,6 +30,14 @@
 #define GPIO_OUTPUT_MASK	(1 << GPIO_OUTPUT_SHIFT)
 #define GPIO_OUTPUT_ENABLE	(1 << 23)
 
+/*
+ * The definitions below should be used to make GPIO arrays compact and
+ * easy to understand.
+ */
+#define INPUT		0
+#define OUTPUT_H	(FCH_GPIO_OUTPUT_ENABLE | FCH_GPIO_OUTPUT_VALUE)
+#define OUTPUT_L	FCH_GPIO_OUTPUT_ENABLE
+
 /* GPIO_0 - GPIO_62 */
 #define GPIO_BANK0_CONTROL(gpio) \
 	(AMD_SB_ACPI_MMIO_ADDR + 0x1500 + ((gpio) * 4))
diff --git a/src/soc/amd/stoneyridge/include/soc/iomap.h b/src/soc/amd/stoneyridge/include/soc/iomap.h
index 2d42ad9ad9..72a1e8c6f5 100644
--- a/src/soc/amd/stoneyridge/include/soc/iomap.h
+++ b/src/soc/amd/stoneyridge/include/soc/iomap.h
@@ -61,4 +61,8 @@
 #define AB_DATA				(AB_INDX+4)
 #define SYS_RESET			0xcf9
 
+/* GPIO control and mux access */
+#define AMD_GPIO_MUX			(AMD_SB_ACPI_MMIO_ADDR + 0x00000d00)
+#define AMD_GPIO_CONTROL		(AMD_SB_ACPI_MMIO_ADDR + 0x00001500)
+
 #endif /* __SOC_STONEYRIDGE_IOMAP_H__ */
diff --git a/src/soc/amd/stoneyridge/include/soc/southbridge.h b/src/soc/amd/stoneyridge/include/soc/southbridge.h
index 7f1e210123..f77640e70d 100644
--- a/src/soc/amd/stoneyridge/include/soc/southbridge.h
+++ b/src/soc/amd/stoneyridge/include/soc/southbridge.h
@@ -24,6 +24,7 @@
 #include <device/pci_def.h>
 #include <soc/iomap.h>
 #include "chip.h"
+#include <rules.h>
 
 /* PSP at D8F0 */
 #define PSP_MAILBOX_BAR			PCI_BASE_ADDRESS_4 /* BKDG: "BAR3" */
@@ -265,7 +266,6 @@
 #define XHCI_PM_INDIRECT_INDEX		0x48
 #define XHCI_PM_INDIRECT_DATA		0x4C
 #define   XHCI_OVER_CURRENT_CONTROL	0x30
-
 #define EHCI_OVER_CURRENT_CONTROL	0x70
 
 #define USB_OC0				0
@@ -286,6 +286,20 @@
 
 #define WIDEIO_RANGE_ERROR		-1
 #define TOTAL_WIDEIO_PORTS		3
+#define AMD_GPIO_MUX_MASK		0x03
+
+#if ENV_BOOTBLOCK
+#define GPIO_TABLE_BOOTBLOCK		1
+#else
+#define GPIO_TABLE_BOOTBLOCK		0
+#endif
+#define STR_GPIO_STAGE			ENV_STRING
+
+struct soc_amd_stoneyridge_gpio {
+	uint8_t gpio;
+	uint8_t function;
+	uint8_t control;
+};
 
 void sb_enable_rom(void);
 void configure_stoneyridge_uart(void);
@@ -331,6 +345,20 @@ void xhci_pm_write32(uint8_t reg, uint32_t value);
 uint32_t xhci_pm_read32(uint8_t reg);
 void bootblock_fch_early_init(void);
 /**
+ * @brief get table and table size to program GPIO
+ *
+ * @param size = pointer to variable where to return table size
+ *
+ * @return pointer to the desired table
+ */
+const struct soc_amd_stoneyridge_gpio *board_get_gpio(size_t *size);
+/**
+ * @brief program a particular set of GPIO
+ *
+ * @return none
+ */
+void sb_program_gpio(void);
+/**
  * @brief Find the size of a particular wide IO
  *
  * @param index = index of desired wide IO
diff --git a/src/soc/amd/stoneyridge/southbridge.c b/src/soc/amd/stoneyridge/southbridge.c
index 0af774bbf6..46906d09ab 100644
--- a/src/soc/amd/stoneyridge/southbridge.c
+++ b/src/soc/amd/stoneyridge/southbridge.c
@@ -155,6 +155,32 @@ const struct irq_idx_name *sb_get_apic_reg_association(size_t *size)
 	return irq_association;
 }
 
+void sb_program_gpio(void)
+{
+	void *tmp_ptr;
+	const struct soc_amd_stoneyridge_gpio *gpio_ptr;
+	size_t size;
+	uint8_t control, mux, index;
+
+	printk(BIOS_SPEW, "GPIO programming stage %s\n", STR_GPIO_STAGE);
+	gpio_ptr = board_get_gpio(&size);
+	for (index = 0; index < size; index++) {
+		mux = gpio_ptr[index].function;
+		control = gpio_ptr[index].control;
+		tmp_ptr = (void *)(gpio_ptr[index].gpio + AMD_GPIO_MUX);
+		write8(tmp_ptr, mux & AMD_GPIO_MUX_MASK);
+
+		/*
+		 * Get the address of AMD_GPIO_CONTROL (dword) relative
+		 * to the desired pin and program bits 16-23.
+		 */
+		tmp_ptr = (void *)(gpio_ptr[index].gpio * sizeof(uint32_t) +
+					AMD_GPIO_CONTROL + 2);
+		write8(tmp_ptr, control);
+	}
+	printk(BIOS_SPEW, "End GPIO programming\n");
+}
+
 /**
  * @brief Find the size of a particular wide IO
  *