soc/intel/common/block/gpio: Add gpio pad based function

Introduce three functions:

- new_padbased_table:
  Returns the gpio pad number based table
- gpio_padbased_override:
  Must pass the table with padbased table
- gpio_configure_pads_with_padbased:
  Must pass the table with padbased table, will skip configures the
  unmapped pins by check pad and DW0 are 0.

Some boards may have complex, SKU-based GPIO programming. This
patch provides for a simpler pattern of controlling overrides of
GPIO programming by providing a table of pad configuration indexed
by pad number. Thus, pad state can be overwritten over multiple
overrides until the final takes place, and then all GPIO
programming is performed at once.

Signed-off-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Change-Id: I8b99127b73701b50a7f2e051dee9d12c9da9b741
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64712
Reviewed-by: Kangheui Won <khwon@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/gpio/gpio.c b/src/soc/intel/common/block/gpio/gpio.c
index baf0e168b8..4b27f3074c 100644
--- a/src/soc/intel/common/block/gpio/gpio.c
+++ b/src/soc/intel/common/block/gpio/gpio.c
@@ -432,6 +432,38 @@ void gpio_configure_pads_with_override(const struct pad_config *base_cfg,
 	}
 }
 
+struct pad_config *new_padbased_table(void)
+{
+	struct pad_config *padbased_table;
+	padbased_table = malloc(sizeof(struct pad_config) * TOTAL_PADS);
+	memset(padbased_table, 0, sizeof(struct pad_config) * TOTAL_PADS);
+
+	return padbased_table;
+}
+
+void gpio_padbased_override(struct pad_config *padbased_table,
+				const struct pad_config *override_cfg,
+				size_t override_num_pads)
+{
+	for (size_t i = 0; i < override_num_pads; i++) {
+		/* Prevent overflow hack */
+		ASSERT(override_cfg[i].pad < TOTAL_PADS);
+		padbased_table[override_cfg[i].pad] = override_cfg[i];
+	}
+}
+
+void gpio_configure_pads_with_padbased(struct pad_config *padbased_table)
+{
+	size_t i;
+	const struct pad_config *cfg = padbased_table;
+	for (i = 0; i < TOTAL_PADS; i++) {
+		/* Consider unmapped pin as default setting, skip */
+		if (cfg[i].pad == 0 && cfg[i].pad_config[0] == 0)
+			continue;
+		gpio_configure_pad(&cfg[i]);
+	}
+}
+
 void *gpio_dwx_address(const gpio_t pad)
 {
 	/* Calculate Address of DW0 register for given GPIO