soc/amd/cezanne/uart: introduce and use soc_get_uart_ctrlr_info

Introduce and use soc_get_uart_ctrlr_info to access the uart_info array
to further decouple uart_info from the code as preparation to factor out
most of the code to a common implementation. In order to slightly reduce
the number of function calls, pass the size of and pointer to uart_info
to get_uart_idx as a parameter instead of calling again
soc_get_uart_ctrlr_info in get_uart_idx despite all callers already
having the information form the soc_get_uart_ctrlr_info call.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Iab1aec44c55570aa8085aeaf68ec69fe6de0f2ba
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68535
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com>

1 files changed, 30 insertions, 11 deletions

diff --git a/src/soc/amd/cezanne/uart.c b/src/soc/amd/cezanne/uart.c
index a0edf597d3..684786b51e 100644
--- a/src/soc/amd/cezanne/uart.c
+++ b/src/soc/amd/cezanne/uart.c
@@ -25,19 +25,29 @@ static const struct soc_uart_ctrlr_info uart_info[] = {
 		} },
 };
 
+static const struct soc_uart_ctrlr_info *soc_get_uart_ctrlr_info(size_t *num_ctrlrs)
+{
+	*num_ctrlrs = ARRAY_SIZE(uart_info);
+	return uart_info;
+}
+
 uintptr_t get_uart_base(unsigned int idx)
 {
-	if (idx >= ARRAY_SIZE(uart_info))
+	size_t num_ctrlrs;
+	const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
+
+	if (idx >= num_ctrlrs)
 		return 0;
 
-	return uart_info[idx].base;
+	return ctrlr[idx].base;
 }
 
-static enum cb_err get_uart_idx(uintptr_t base, unsigned int *idx)
+static enum cb_err get_uart_idx(uintptr_t base, const struct soc_uart_ctrlr_info *ctrlr,
+				size_t num_ctrlrs, unsigned int *idx)
 {
 	unsigned int i;
-	for (i = 0; i < ARRAY_SIZE(uart_info); i++) {
-		if (base == uart_info[i].base) {
+	for (i = 0; i < num_ctrlrs; i++) {
+		if (base == ctrlr[i].base) {
 			*idx = i;
 			return CB_SUCCESS;
 		}
@@ -48,10 +58,13 @@ static enum cb_err get_uart_idx(uintptr_t base, unsigned int *idx)
 static enum cb_err get_uart_aoac_device(uintptr_t base, unsigned int *aoac_dev)
 {
 	unsigned int idx;
-	if (get_uart_idx(base, &idx) == CB_ERR)
+	size_t num_ctrlrs;
+	const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
+
+	if (get_uart_idx(base, ctrlr, num_ctrlrs, &idx) == CB_ERR)
 		return CB_ERR;
 
-	*aoac_dev = uart_info[idx].aoac_device;
+	*aoac_dev = ctrlr[idx].aoac_device;
 	return CB_SUCCESS;
 }
 
@@ -62,17 +75,23 @@ void clear_uart_legacy_config(void)
 
 void set_uart_config(unsigned int idx)
 {
-	if (idx >= ARRAY_SIZE(uart_info))
+	size_t num_ctrlrs;
+	const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
+
+	if (idx >= num_ctrlrs)
 		return;
 
-	gpio_configure_pads(uart_info[idx].mux, 2);
+	gpio_configure_pads(ctrlr[idx].mux, 2);
 }
 
 static const char *uart_acpi_name(const struct device *dev)
 {
 	unsigned int idx;
-	if (get_uart_idx(dev->path.mmio.addr, &idx) == CB_SUCCESS)
-		return uart_info[idx].acpi_name;
+	size_t num_ctrlrs;
+	const struct soc_uart_ctrlr_info *ctrlr = soc_get_uart_ctrlr_info(&num_ctrlrs);
+
+	if (get_uart_idx(dev->path.mmio.addr, ctrlr, num_ctrlrs, &idx) == CB_SUCCESS)
+		return ctrlr[idx].acpi_name;
 	else
 		return NULL;
 }