rockchip: Allow console device to be set by DTB.
Currently the compile-time constant PLAT_RK_UART_BASE defines
which UART is used as console device. E.g. on RK3399 it is set
to UART2. That means, that a single bl31 image can not be used
for two boards, which just differ on the UART console.
This patch addresses this limitation by parsing the "stdout-path"
property from the "chosen" node in the DTB. The expected property
string is expected to have the form "serialN:XXX", with
N being either 0, 1, 2, 3 or 4. When the property is found, it will
be used to override PLAT_RK_UART_BASE.
Tested on RK3399-Q7, with a stdout-path of "serial0:115200n8".
Signed-off-by: Christoph Müllner <christophm30@gmail.com>
Change-Id: Iafe1320e77ab006c121f8d52745d54cef68a48c7
diff --git a/plat/rockchip/common/params_setup.c b/plat/rockchip/common/params_setup.c
index baf2563..8a743bf 100644
--- a/plat/rockchip/common/params_setup.c
+++ b/plat/rockchip/common/params_setup.c
@@ -28,6 +28,12 @@
static struct gpio_info suspend_gpio[10];
uint32_t suspend_gpio_cnt;
static struct apio_info *suspend_apio;
+static uint32_t rk_uart_base = PLAT_RK_UART_BASE;
+
+uint32_t rockchip_get_uart_base(void)
+{
+ return rk_uart_base;
+}
#if COREBOOT
static int dt_process_fdt(void *blob)
@@ -42,6 +48,63 @@
return &fdt_buffer[0];
}
+static void plat_rockchip_dt_process_fdt_uart(void *fdt)
+{
+ const char *path_name = "/chosen";
+ const char *prop_name = "stdout-path";
+ int node_offset;
+ int stdout_path_len;
+ const char *stdout_path;
+ char serial_char;
+ int serial_no;
+ uint32_t uart_base;
+
+ node_offset = fdt_path_offset(fdt, path_name);
+ if (node_offset < 0)
+ return;
+
+ stdout_path = fdt_getprop(fdt, node_offset, prop_name,
+ &stdout_path_len);
+ if (stdout_path == NULL)
+ return;
+
+ /*
+ * We expect something like:
+ * "serial0:...""
+ */
+ if (strncmp("serial", stdout_path, 6) != 0)
+ return;
+
+ serial_char = stdout_path[6];
+ serial_no = serial_char - '0';
+
+ switch (serial_no) {
+ case 0:
+ uart_base = UART0_BASE;
+ break;
+ case 1:
+ uart_base = UART1_BASE;
+ break;
+ case 2:
+ uart_base = UART2_BASE;
+ break;
+#ifdef UART3_BASE
+ case 3:
+ uart_base = UART3_BASE;
+ break;
+#endif
+#ifdef UART4_BASE
+ case 4:
+ uart_base = UART4_BASE;
+ break;
+#endif
+ default:
+ return;
+ }
+
+ rk_uart_base = uart_base;
+}
+
static int dt_process_fdt(void *blob)
{
void *fdt = plat_get_fdt();
@@ -51,6 +114,8 @@
if (ret < 0)
return ret;
+ plat_rockchip_dt_process_fdt_uart(fdt);
+
return 0;
}
#endif