mirror of https://github.com/wolfSSL/wolfBoot.git
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* nxp_ppc_io.h
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*
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* MMIO accessors for the generic NS16550 driver on NXP QorIQ PowerPC.
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*
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* Copyright (C) 2026 wolfSSL Inc.
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*
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* This file is part of wolfBoot.
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*
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* wolfBoot is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* wolfBoot is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
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*/
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#ifndef WOLFBOOT_NXP_PPC_IO_H
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#define WOLFBOOT_NXP_PPC_IO_H
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/* PowerPC device access needs the enforced-ordering sequences; a plain
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* volatile access is not enough. These match get8()/set8() in hal/nxp_ppc.h
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* byte for byte, repeated rather than included so the driver builds the same
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* from the stage1 and test-app sub-makes, which do not share the top-level
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* include path. */
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static inline uint8_t ns16550_ppc_rd8(uintptr_t addr)
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{
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int ret;
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__asm__ __volatile__(
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"sync;\n"
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"lbz%U1%X1 %0,%1;\n"
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"twi 0,%0,0;\n"
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"isync"
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: "=r" (ret) : "m" (*(const volatile unsigned char*)addr)
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);
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return (uint8_t)ret;
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}
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static inline void ns16550_ppc_wr8(uintptr_t addr, uint8_t val)
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{
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__asm__ __volatile__(
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"stb%U0%X0 %1,%0;\n"
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"eieio"
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: "=m" (*(volatile unsigned char*)addr) : "r" ((int)val)
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);
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}
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#define NS16550_RD8(a) ns16550_ppc_rd8((uintptr_t)(a))
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#define NS16550_WR8(a, v) ns16550_ppc_wr8((uintptr_t)(a), (uint8_t)(v))
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#endif /* WOLFBOOT_NXP_PPC_IO_H */
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