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u-boot/arch/mips/mach-mscc/lowlevel_init.S

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MSCC: add support for Ocelot SoCs This family of SoCs are found in the Microsemi Switches solution and have already a support in the linux kernel. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:47 +00:00
/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
/*
* Copyright (c) 2018 Microsemi Corporation
*/
#include <asm/asm.h>
#include <asm/regdef.h>
.set noreorder
.extern vcoreiii_tlb_init
mips: vcoreiii: Fix cache coherency issues This patch fixes an stability issue seen on some vcoreiii targets, which was root caused to a cache inconsistency situation. The inconsistency was caused by having kuseg pointing to NOR area but used as a stack/gd/heap area during initialization, while only relatively late remapping the RAM area into kuseg position. The fix is to initialize the DDR right after the TLB setup, and then remapping it into position before gd/stack/heap usage. Reported-by: Ramin Seyed-Moussavi <ramin.moussavi@yacoub.de> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
2020-02-06 09:45:40 +00:00
.extern vcoreiii_ddr_init
MSCC: add support for Luton SoCs As the Ocelots SoCs, this family of SoCs are found in the Microsemi Switches solution. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:48 +00:00
#ifdef CONFIG_SOC_LUTON
.extern pll_init
#endif
MSCC: add support for Ocelot SoCs This family of SoCs are found in the Microsemi Switches solution and have already a support in the linux kernel. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:47 +00:00
LEAF(lowlevel_init)
/*
* As we have no stack yet, we can assume the restricted
* luxury of the sX-registers without saving them
*/
mips: vcoreiii: Fix cache coherency issues This patch fixes an stability issue seen on some vcoreiii targets, which was root caused to a cache inconsistency situation. The inconsistency was caused by having kuseg pointing to NOR area but used as a stack/gd/heap area during initialization, while only relatively late remapping the RAM area into kuseg position. The fix is to initialize the DDR right after the TLB setup, and then remapping it into position before gd/stack/heap usage. Reported-by: Ramin Seyed-Moussavi <ramin.moussavi@yacoub.de> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
2020-02-06 09:45:40 +00:00
/* Modify ra/s0 such we return to physical NOR location */
li t0, 0x0fffffff
li t1, CONFIG_SYS_TEXT_BASE
and s0, ra, t0
add s0, s0, t1
MSCC: add support for Ocelot SoCs This family of SoCs are found in the Microsemi Switches solution and have already a support in the linux kernel. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:47 +00:00
jal vcoreiii_tlb_init
nop
mips: vcoreiii: Fix cache coherency issues This patch fixes an stability issue seen on some vcoreiii targets, which was root caused to a cache inconsistency situation. The inconsistency was caused by having kuseg pointing to NOR area but used as a stack/gd/heap area during initialization, while only relatively late remapping the RAM area into kuseg position. The fix is to initialize the DDR right after the TLB setup, and then remapping it into position before gd/stack/heap usage. Reported-by: Ramin Seyed-Moussavi <ramin.moussavi@yacoub.de> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
2020-02-06 09:45:40 +00:00
MSCC: add support for Luton SoCs As the Ocelots SoCs, this family of SoCs are found in the Microsemi Switches solution. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:48 +00:00
#ifdef CONFIG_SOC_LUTON
jal pll_init
nop
#endif
mips: vcoreiii: Fix cache coherency issues This patch fixes an stability issue seen on some vcoreiii targets, which was root caused to a cache inconsistency situation. The inconsistency was caused by having kuseg pointing to NOR area but used as a stack/gd/heap area during initialization, while only relatively late remapping the RAM area into kuseg position. The fix is to initialize the DDR right after the TLB setup, and then remapping it into position before gd/stack/heap usage. Reported-by: Ramin Seyed-Moussavi <ramin.moussavi@yacoub.de> Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
2020-02-06 09:45:40 +00:00
/* Initialize DDR controller to enable stack/gd/heap */
0:
jal vcoreiii_ddr_init
nop
bnez v0, 0b /* Retry on error */
nop
MSCC: add support for Ocelot SoCs This family of SoCs are found in the Microsemi Switches solution and have already a support in the linux kernel. Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
2018-12-14 15:16:47 +00:00
jr s0
nop
END(lowlevel_init)
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