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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 25/28] ARM: at91: sama5d2: populate $bootsource and $bootsource_instance
Date: Wed,  1 Jul 2020 07:23:37 +0200	[thread overview]
Message-ID: <20200701052340.9462-26-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20200701052340.9462-1-a.fatoum@pengutronix.de>

The BootROM passes us information about the boot medium in r4 and we
already use that in first stage and pass it along to second stage
PBL already. To make use of it, we need to pass it to barebox proper, do
this by writing it in the last 4 bytes of the SRAM. As second stage
always run in DRAM, this is safe to do.

We could also write to SRAM directly from first stage, but at91bootstrap
passes info in r4 as well for the sama5d3 boards, so we do it likewise
to maintain compatibility.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/arm/boards/sama5d27-giantboard/lowlevel.c  |  6 +++---
 arch/arm/boards/sama5d27-som1/lowlevel.c        |  2 +-
 arch/arm/mach-at91/ddramc.c                     |  4 +++-
 arch/arm/mach-at91/include/mach/ddramc.h        |  3 +--
 .../mach-at91/include/mach/sama5_bootsource.h   |  3 +++
 arch/arm/mach-at91/sama5d2.c                    | 17 +++++++++++++++++
 6 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/arch/arm/boards/sama5d27-giantboard/lowlevel.c b/arch/arm/boards/sama5d27-giantboard/lowlevel.c
index 0bb3a7289c99..3dada9baf23c 100644
--- a/arch/arm/boards/sama5d27-giantboard/lowlevel.c
+++ b/arch/arm/boards/sama5d27-giantboard/lowlevel.c
@@ -7,7 +7,7 @@
 #include <init.h>
 
 #include <asm/barebox-arm-head.h>
-#include <asm/barebox-arm.h>
+#include <mach/barebox-arm.h>
 #include <mach/sama5d2_ll.h>
 #include <mach/iomux.h>
 #include <debug_ll.h>
@@ -25,7 +25,7 @@ static void dbgu_init(void)
 
 extern char __dtb_z_at91_sama5d27_giantboard_start[];
 
-ENTRY_FUNCTION(start_sama5d27_giantboard, r0, r1, r2)
+SAMA5_ENTRY_FUNCTION(start_sama5d27_giantboard, r4)
 {
 	void *fdt;
 
@@ -36,5 +36,5 @@ ENTRY_FUNCTION(start_sama5d27_giantboard, r0, r1, r2)
 
 	fdt = __dtb_z_at91_sama5d27_giantboard_start + get_runtime_offset();
 
-	sama5d2_barebox_entry(fdt);
+	sama5d2_barebox_entry(r4, fdt);
 }
diff --git a/arch/arm/boards/sama5d27-som1/lowlevel.c b/arch/arm/boards/sama5d27-som1/lowlevel.c
index bf01b161e2f4..e9c781297c27 100644
--- a/arch/arm/boards/sama5d27-som1/lowlevel.c
+++ b/arch/arm/boards/sama5d27-som1/lowlevel.c
@@ -71,5 +71,5 @@ SAMA5_ENTRY_FUNCTION(start_sama5d27_som1_ek, r4)
 	fdt = __dtb_z_at91_sama5d27_som1_ek_start + get_runtime_offset();
 
 	ek_turn_led(RGB_LED_GREEN);
-	sama5d2_barebox_entry(fdt);
+	sama5d2_barebox_entry(r4, fdt);
 }
diff --git a/arch/arm/mach-at91/ddramc.c b/arch/arm/mach-at91/ddramc.c
index 6dac7946896b..a241ea9f0a61 100644
--- a/arch/arm/mach-at91/ddramc.c
+++ b/arch/arm/mach-at91/ddramc.c
@@ -9,6 +9,7 @@
 #include <mach/hardware.h>
 #include <asm/barebox-arm.h>
 #include <mach/at91_ddrsdrc.h>
+#include <mach/sama5_bootsource.h>
 #include <asm/memory.h>
 #include <pbl.h>
 #include <io.h>
@@ -18,8 +19,9 @@ static unsigned sama5_ramsize(void __iomem *base)
 	return at91_get_ddram_size(base, true);
 }
 
-void __noreturn sama5d2_barebox_entry(void *boarddata)
+void __noreturn sama5d2_barebox_entry(unsigned int r4, void *boarddata)
 {
+	__sama5d2_stashed_bootrom_r4 = r4;
 	barebox_arm_entry(SAMA5_DDRCS, sama5_ramsize(SAMA5D2_BASE_MPDDRC),
 			  boarddata);
 }
diff --git a/arch/arm/mach-at91/include/mach/ddramc.h b/arch/arm/mach-at91/include/mach/ddramc.h
index cd85bb6eab21..b929bf5f58e8 100644
--- a/arch/arm/mach-at91/include/mach/ddramc.h
+++ b/arch/arm/mach-at91/include/mach/ddramc.h
@@ -32,7 +32,6 @@ void at91_lpddr1_sdram_initialize(void __iomem *base_address,
 				  void __iomem *ram_address,
 				  struct at91_ddramc_register *ddramc_config);
 
-void __noreturn sama5d2_barebox_entry(void *boarddata);
-
+void __noreturn sama5d2_barebox_entry(unsigned int r4, void *boarddata);
 
 #endif /* #ifndef __DDRAMC_H__ */
diff --git a/arch/arm/mach-at91/include/mach/sama5_bootsource.h b/arch/arm/mach-at91/include/mach/sama5_bootsource.h
index 29354dcaf34d..0f90afe90232 100644
--- a/arch/arm/mach-at91/include/mach/sama5_bootsource.h
+++ b/arch/arm/mach-at91/include/mach/sama5_bootsource.h
@@ -43,4 +43,7 @@ static inline int sama5_bootsource_instance(u32 reg)
 	return FIELD_GET(SAMA5_BOOTSOURCE_INSTANCE, reg);
 }
 
+#define __sama5d2_stashed_bootrom_r4 \
+	(*(volatile u32 *)(SAMA5D2_SRAM_BASE + SAMA5D2_SRAM_SIZE - 0x4))
+
 #endif
diff --git a/arch/arm/mach-at91/sama5d2.c b/arch/arm/mach-at91/sama5d2.c
index c498b0964534..2ce6d7f36f56 100644
--- a/arch/arm/mach-at91/sama5d2.c
+++ b/arch/arm/mach-at91/sama5d2.c
@@ -6,6 +6,7 @@
 #include <mach/aic.h>
 #include <mach/sama5d2.h>
 #include <asm/cache-l2x0.h>
+#include <mach/sama5_bootsource.h>
 #include <asm/mmu.h>
 
 #define SFR_CAN		0x48
@@ -52,3 +53,19 @@ static int sama5d2_init(void)
 	return 0;
 }
 postmmu_initcall(sama5d2_init);
+
+static int sama5d2_bootsource_init(void)
+{
+	u32 r4;
+
+	if (!of_machine_is_compatible("atmel,sama5d2"))
+		return 0;
+
+	r4 = __sama5d2_stashed_bootrom_r4;
+
+	bootsource_set(sama5_bootsource(r4));
+	bootsource_set_instance(sama5_bootsource_instance(r4));
+
+	return 0;
+}
+postcore_initcall(sama5d2_bootsource_init);
-- 
2.27.0


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  parent reply	other threads:[~2020-07-01  5:24 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01  5:23 [PATCH 00/28] ARM: at91: add sama5d2 first stage support Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 01/28] ARM: at91: remove <mach/hardware.h> include from assembly code Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 02/28] ARM: at91: sama5d2: cast peripheral base addresses to __iomem pointers Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 03/28] ARM: at91: import at91bootstrap's at91_ddrsdrc.h Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 04/28] ARM: at91: migrate at91sam9_ddrsdr.h to use " Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 05/28] ARM: at91: replace at91sam9_ddrsdr.h with " Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 06/28] ARM: at91: import early_udelay from at91bootstrap Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 07/28] ARM: at91: import low level DDRAMC initialization code " Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 08/28] ARM: at91: watchdog: implement at91_wdt_disable Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 09/28] watchdog: add support for at91sam9/sama5 watchdog Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 10/28] ARM: at91: implement sama5d2 lowlevel init Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 11/28] ARM: at91: sama5d2: add sama5d2 matrix configuration Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 12/28] ARM: at91: add sama5d2 cache init Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 13/28] ARM: at91: add necessary Advanced Interrupt Controller configuration Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 14/28] ARM: at91: extend low level PMC driver for generic clk support Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 15/28] pbl: add block I/O API Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 16/28] fs: fat: extend for in-PBL support Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 17/28] mci: extend atmel-sdhci driver to first stage use Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 18/28] ARM: at91: add code for sama5 boot source detection Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 19/28] ARM: at91: add helpers for chain-loading barebox from SD-card Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 20/28] ARM: at91: sama5d2: reuse stack set-up by first stage Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 21/28] at91: debug_ll: remove duplicated IS_ENABLED(CONFIG_DEBUG_LL) condition Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 22/28] ARM: at91: sama5d2: reduce UART setup boilerplate with new helpers Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 23/28] ARM: at91: sama5d27-som1: add additional first stage entry point Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 24/28] ARM: at91: sama5d2: read back memory size from DDRAM controller Ahmad Fatoum
2020-07-01  5:23 ` Ahmad Fatoum [this message]
2020-07-01  5:23 ` [PATCH 26/28] ARM: at91: sama5d27-som1-ek: add barebox_update and multi environment support Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 27/28] ARM: at91: sama5d27-giantboard: add additional first stage entry point Ahmad Fatoum
2020-07-01  5:23 ` [PATCH 28/28] ARM: at91: sama5d27-giantboard: add default environment/bbu Ahmad Fatoum
2020-07-01  9:10 [PATCH RESEND 00/28] ARM: at91: add sama5d2 first stage support Ahmad Fatoum
2020-07-01  9:11 ` [PATCH 25/28] ARM: at91: sama5d2: populate $bootsource and $bootsource_instance Ahmad Fatoum

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