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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 10/12] ARM: at91: microchip-ksz9477-evb: add debug_ll UART
Date: Mon, 14 Oct 2019 14:18:59 +0200	[thread overview]
Message-ID: <20191014121901.19471-11-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20191014121901.19471-1-a.fatoum@pengutronix.de>

The EVB has the dbgu TX on PB31. Pinmux and set up the UART on it when
DEBUG_LL is enabled, so early barebox boot messages can be printed.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 .../boards/microchip-ksz9477-evb/lowlevel.c   | 30 +++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/arch/arm/boards/microchip-ksz9477-evb/lowlevel.c b/arch/arm/boards/microchip-ksz9477-evb/lowlevel.c
index 2a72ca321a09..30a5760da6a4 100644
--- a/arch/arm/boards/microchip-ksz9477-evb/lowlevel.c
+++ b/arch/arm/boards/microchip-ksz9477-evb/lowlevel.c
@@ -1,7 +1,7 @@
+// SPDX-License-Identifier: GPL-2.0-only AND BSD-1-Clause
 /*
+ * Copyright (C) 2014, Atmel Corporation
  * Copyright (C) 2018 Ahmad Fatoum, Pengutronix
- *
- * Under GPLv2
  */
 
 #include <common.h>
@@ -9,8 +9,32 @@
 
 #include <asm/barebox-arm-head.h>
 #include <asm/barebox-arm.h>
+#include <mach/at91_pmc_ll.h>
 
 #include <mach/hardware.h>
+#include <mach/iomux.h>
+#include <debug_ll.h>
+#include <mach/at91_dbgu.h>
+
+/* PCK = 528MHz, MCK = 132MHz */
+#define MASTER_CLOCK	132000000
+
+#define sama5d3_pmc_enable_periph_clock(clk) \
+	at91_pmc_enable_periph_clock(IOMEM(SAMA5D3_BASE_PMC), clk)
+
+static void dbgu_init(void)
+{
+	void __iomem *pio = IOMEM(SAMA5D3_BASE_PIOB);
+
+	sama5d3_pmc_enable_periph_clock(SAMA5D3_ID_PIOB);
+
+	at91_mux_pio3_pin(pio, pin_to_mask(AT91_PIN_PB31), AT91_MUX_PERIPH_A, 0);
+
+	sama5d3_pmc_enable_periph_clock(SAMA5D3_ID_DBGU);
+	at91_dbgu_setup_ll(IOMEM(AT91_BASE_DBGU1), MASTER_CLOCK, 115200);
+
+	putc_ll('>');
+}
 
 extern char __dtb_z_at91_microchip_ksz9477_evb_start[];
 
@@ -22,6 +46,8 @@ ENTRY_FUNCTION(start_sama5d3_xplained_ung8071, r0, r1, r2)
 
 	arm_setup_stack(SAMA5D3_SRAM_BASE + SAMA5D3_SRAM_SIZE);
 
+	if (IS_ENABLED(CONFIG_DEBUG_LL))
+		dbgu_init();
 
 	fdt = __dtb_z_at91_microchip_ksz9477_evb_start + get_runtime_offset();
 
-- 
2.23.0


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  parent reply	other threads:[~2019-10-14 12:19 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-14 12:18 [PATCH 00/12] ARM: at91: improve sama5 and multi-image support Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 01/12] ARM: at91: at91sam9x5ek: squelch new dtc warning Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 02/12] ARM: at91: delete no-longer needed #ifdef guards Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 03/12] usb: gadget: at91_udc: don't depend on !ARCH_SAMA5D4 Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 04/12] ARM: at91: don't define ARCH_BAREBOX_MAX_BARE_INIT_SIZE for multi-image Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 05/12] ARM: at91: build for all SoCs when AT91_MULTI_BOARDS is selected Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 06/12] ARM: at91: use compressed DTB for AT91_MULTI_BOARDS Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 07/12] LICENSES: add BSD-1-Clause license Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 08/12] ARM: at91: import lowlevel clock initialization from at91bootstrap Ahmad Fatoum
2019-10-14 12:42   ` Roland Hieber
2019-10-14 12:50     ` [PATCH] fixup! " Ahmad Fatoum
2019-10-14 12:18 ` [PATCH 09/12] ARM: at91: import lowlevel dbgu UART init code " Ahmad Fatoum
2019-10-14 12:18 ` Ahmad Fatoum [this message]
2019-10-14 12:19 ` [PATCH 11/12] ARM: at91: add basic sama5d2 support Ahmad Fatoum
2019-10-14 12:19 ` [PATCH 12/12] ARM: at91: add basic sama5d2-som1-ek1 support Ahmad Fatoum

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