rockchip: px30: Add support for using UART3 as debug UART
Some generic PX30 SoMs found in the wild use UART3 as their debug output
instead of UART2 (used for MMC) and UART5.
Make it possible to use UART3 as early debug output, with the associated
clock and pinmux configuration. Two sets of output pins are supported (M0/M1).
Future users should also note that the pinmux default in the dts is to use
the M1 pins while the Kconfig option takes M0 as a default.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
diff --git a/arch/arm/mach-rockchip/px30/px30.c b/arch/arm/mach-rockchip/px30/px30.c
index a2241cf..5014ee8 100644
--- a/arch/arm/mach-rockchip/px30/px30.c
+++ b/arch/arm/mach-rockchip/px30/px30.c
@@ -37,6 +37,7 @@
struct mm_region *mem_map = px30_mem_map;
#define PMU_PWRDN_CON 0xff000018
+#define PMUGRF_BASE 0xff010000
#define GRF_BASE 0xff140000
#define CRU_BASE 0xff2b0000
#define VIDEO_PHY_BASE 0xff2e0000
@@ -49,6 +50,23 @@
#define QOS_PRIORITY_LEVEL(h, l) ((((h) & 3) << 8) | ((l) & 3))
+/* GRF_GPIO1BH_IOMUX */
+enum {
+ GPIO1B7_SHIFT = 12,
+ GPIO1B7_MASK = 0xf << GPIO1B7_SHIFT,
+ GPIO1B7_GPIO = 0,
+ GPIO1B7_FLASH_RDN,
+ GPIO1B7_UART3_RXM1,
+ GPIO1B7_SPI0_CLK,
+
+ GPIO1B6_SHIFT = 8,
+ GPIO1B6_MASK = 0xf << GPIO1B6_SHIFT,
+ GPIO1B6_GPIO = 0,
+ GPIO1B6_FLASH_CS1,
+ GPIO1B6_UART3_TXM1,
+ GPIO1B6_SPI0_CSN,
+};
+
/* GRF_GPIO1CL_IOMUX */
enum {
GPIO1C1_SHIFT = 4,
@@ -128,6 +146,23 @@
GPIO3A1_UART5_RX = 4,
};
+/* PMUGRF_GPIO0CL_IOMUX */
+enum {
+ GPIO0C1_SHIFT = 2,
+ GPIO0C1_MASK = 0x3 << GPIO0C1_SHIFT,
+ GPIO0C1_GPIO = 0,
+ GPIO0C1_PWM_3,
+ GPIO0C1_UART3_RXM0,
+ GPIO0C1_PMU_DEBUG4,
+
+ GPIO0C0_SHIFT = 0,
+ GPIO0C0_MASK = 0x3 << GPIO0C0_SHIFT,
+ GPIO0C0_GPIO = 0,
+ GPIO0C0_PWM_1,
+ GPIO0C0_UART3_TXM0,
+ GPIO0C0_PMU_DEBUG3,
+};
+
int arch_cpu_init(void)
{
static struct px30_grf * const grf = (void *)GRF_BASE;
@@ -175,6 +210,11 @@
#ifdef CONFIG_DEBUG_UART_BOARD_INIT
void board_debug_uart_init(void)
{
+#if defined(CONFIG_DEBUG_UART_BASE) && \
+ (CONFIG_DEBUG_UART_BASE == 0xff168000) && \
+ (CONFIG_DEBUG_UART_CHANNEL != 1)
+ static struct px30_pmugrf * const pmugrf = (void *)PMUGRF_BASE;
+#endif
static struct px30_grf * const grf = (void *)GRF_BASE;
static struct px30_cru * const cru = (void *)CRU_BASE;
@@ -191,6 +231,43 @@
GPIO1C1_MASK | GPIO1C0_MASK,
GPIO1C1_UART1_TX << GPIO1C1_SHIFT |
GPIO1C0_UART1_RX << GPIO1C0_SHIFT);
+#elif defined(CONFIG_DEBUG_UART_BASE) && (CONFIG_DEBUG_UART_BASE == 0xff168000)
+ /* GRF_IOFUNC_CON0 */
+ enum {
+ CON_IOMUX_UART3SEL_SHIFT = 9,
+ CON_IOMUX_UART3SEL_MASK = 1 << CON_IOMUX_UART3SEL_SHIFT,
+ CON_IOMUX_UART3SEL_M0 = 0,
+ CON_IOMUX_UART3SEL_M1,
+ };
+
+ /* uart_sel_clk default select 24MHz */
+ rk_clrsetreg(&cru->clksel_con[40],
+ UART3_PLL_SEL_MASK | UART3_DIV_CON_MASK,
+ UART3_PLL_SEL_24M << UART3_PLL_SEL_SHIFT | 0);
+ rk_clrsetreg(&cru->clksel_con[41],
+ UART3_CLK_SEL_MASK,
+ UART3_CLK_SEL_UART3 << UART3_CLK_SEL_SHIFT);
+
+#if (CONFIG_DEBUG_UART_CHANNEL == 1)
+ rk_clrsetreg(&grf->iofunc_con0,
+ CON_IOMUX_UART3SEL_MASK,
+ CON_IOMUX_UART3SEL_M1 << CON_IOMUX_UART3SEL_SHIFT);
+
+ rk_clrsetreg(&grf->gpio1bh_iomux,
+ GPIO1B7_MASK | GPIO1B6_MASK,
+ GPIO1B7_UART3_RXM1 << GPIO1B7_SHIFT |
+ GPIO1B6_UART3_TXM1 << GPIO1B6_SHIFT);
+#else
+ rk_clrsetreg(&grf->iofunc_con0,
+ CON_IOMUX_UART3SEL_MASK,
+ CON_IOMUX_UART3SEL_M0 << CON_IOMUX_UART3SEL_SHIFT);
+
+ rk_clrsetreg(&pmugrf->gpio0cl_iomux,
+ GPIO0C1_MASK | GPIO0C0_MASK,
+ GPIO0C1_UART3_RXM0 << GPIO0C1_SHIFT |
+ GPIO0C0_UART3_TXM0 << GPIO0C0_SHIFT);
+#endif /* CONFIG_DEBUG_UART_CHANNEL == 1 */
+
#elif defined(CONFIG_DEBUG_UART_BASE) && (CONFIG_DEBUG_UART_BASE == 0xff178000)
/* uart_sel_clk default select 24MHz */
rk_clrsetreg(&cru->clksel_con[46],