From: Thomas Bogendoerfer Date: Wed, 27 Jan 2021 13:24:30 +0000 (+0100) Subject: MIPS: of: Introduce helper function to get DTB X-Git-Tag: accepted/tizen/unified/20230118.172025~7732^2~45 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b83ba0b9df56f8404ccc6ebcc7050fb8294f0f20;p=platform%2Fkernel%2Flinux-rpi.git MIPS: of: Introduce helper function to get DTB Selection of the DTB to be used was burried in more or less readable code in head.S. Move this code into a inline helper function and use it. Signed-off-by: Thomas Bogendoerfer Acked-by: Florian Fainelli --- diff --git a/arch/mips/ath79/setup.c b/arch/mips/ath79/setup.c index 7e7bf9c..891f495 100644 --- a/arch/mips/ath79/setup.c +++ b/arch/mips/ath79/setup.c @@ -213,16 +213,17 @@ unsigned int get_c0_compare_int(void) void __init plat_mem_setup(void) { - unsigned long fdt_start; + void *dtb; set_io_port_base(KSEG1); /* Get the position of the FDT passed by the bootloader */ - fdt_start = fw_getenvl("fdt_start"); - if (fdt_start) - __dt_setup_arch((void *)KSEG0ADDR(fdt_start)); - else if (fw_passed_dtb) - __dt_setup_arch((void *)KSEG0ADDR(fw_passed_dtb)); + dtb = (void *)fw_getenvl("fdt_start"); + if (dtb == NULL) + dtb = get_fdt(); + + if (dtb) + __dt_setup_arch((void *)KSEG0ADDR(dtb)); ath79_reset_base = ioremap(AR71XX_RESET_BASE, AR71XX_RESET_SIZE); diff --git a/arch/mips/bmips/setup.c b/arch/mips/bmips/setup.c index 10e31d9..95f8f10 100644 --- a/arch/mips/bmips/setup.c +++ b/arch/mips/bmips/setup.c @@ -161,11 +161,10 @@ void __init plat_mem_setup(void) /* intended to somewhat resemble ARM; see Documentation/arm/booting.rst */ if (fw_arg0 == 0 && fw_arg1 == 0xffffffff) dtb = phys_to_virt(fw_arg2); - else if (fw_passed_dtb) /* UHI interface or appended dtb */ - dtb = (void *)fw_passed_dtb; - else if (&__dtb_start != &__dtb_end) - dtb = (void *)__dtb_start; else + dtb = get_fdt(); + + if (!dtb) panic("no dtb found"); __dt_setup_arch(dtb); diff --git a/arch/mips/generic/init.c b/arch/mips/generic/init.c index 68763fc..1842cdd 100644 --- a/arch/mips/generic/init.c +++ b/arch/mips/generic/init.c @@ -39,14 +39,13 @@ void __init *plat_get_fdt(void) /* Already set up */ return (void *)fdt; - if (fw_passed_dtb && !fdt_check_header((void *)fw_passed_dtb)) { + fdt = (void *)get_fdt(); + if (fdt && !fdt_check_header(fdt)) { /* * We have been provided with the appropriate device tree for * the board. Make use of it & search for any machine struct * based upon the root compatible string. */ - fdt = (void *)fw_passed_dtb; - for_each_mips_machine(check_mach) { match = mips_machine_is_compatible(check_mach, fdt); if (match) { diff --git a/arch/mips/include/asm/bootinfo.h b/arch/mips/include/asm/bootinfo.h index aa03b12..5be10ece 100644 --- a/arch/mips/include/asm/bootinfo.h +++ b/arch/mips/include/asm/bootinfo.h @@ -112,7 +112,27 @@ extern char arcs_cmdline[COMMAND_LINE_SIZE]; extern unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; #ifdef CONFIG_USE_OF -extern unsigned long fw_passed_dtb; +#include +#include + +extern char __appended_dtb[]; + +static inline void *get_fdt(void) +{ + if (IS_ENABLED(CONFIG_MIPS_RAW_APPENDED_DTB) || + IS_ENABLED(CONFIG_MIPS_ELF_APPENDED_DTB)) + if (fdt_magic(&__appended_dtb) == FDT_MAGIC) + return &__appended_dtb; + + if (fw_arg0 == -2) /* UHI interface */ + return (void *)fw_arg1; + + if (IS_ENABLED(CONFIG_BUILTIN_DTB)) + if (&__dtb_start != &__dtb_end) + return &__dtb_start; + + return NULL; +} #endif /* diff --git a/arch/mips/include/asm/octeon/octeon.h b/arch/mips/include/asm/octeon/octeon.h index 08d48f3..7e714ae 100644 --- a/arch/mips/include/asm/octeon/octeon.h +++ b/arch/mips/include/asm/octeon/octeon.h @@ -282,7 +282,6 @@ union octeon_cvmemctl { extern void octeon_check_cpu_bist(void); int octeon_prune_device_tree(void); -extern const char __appended_dtb; extern const char __dtb_octeon_3xxx_begin; extern const char __dtb_octeon_68xx_begin; diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S index 61b7358..b825ed4 100644 --- a/arch/mips/kernel/head.S +++ b/arch/mips/kernel/head.S @@ -93,33 +93,6 @@ NESTED(kernel_entry, 16, sp) # kernel entry point jr t0 0: -#ifdef CONFIG_USE_OF -#if defined(CONFIG_MIPS_RAW_APPENDED_DTB) || \ - defined(CONFIG_MIPS_ELF_APPENDED_DTB) - - PTR_LA t2, __appended_dtb - -#ifdef CONFIG_CPU_BIG_ENDIAN - li t1, 0xd00dfeed -#else /* !CONFIG_CPU_BIG_ENDIAN */ - li t1, 0xedfe0dd0 -#endif /* !CONFIG_CPU_BIG_ENDIAN */ - lw t0, (t2) - beq t0, t1, dtb_found -#endif /* CONFIG_MIPS_RAW_APPENDED_DTB || CONFIG_MIPS_ELF_APPENDED_DTB */ - li t1, -2 - move t2, a1 - beq a0, t1, dtb_found - -#ifdef CONFIG_BUILTIN_DTB - PTR_LA t2, __dtb_start - PTR_LA t1, __dtb_end - bne t1, t2, dtb_found -#endif /* CONFIG_BUILTIN_DTB */ - - li t2, 0 -dtb_found: -#endif /* CONFIG_USE_OF */ PTR_LA t0, __bss_start # clear .bss LONG_S zero, (t0) PTR_LA t1, __bss_stop - LONGSIZE @@ -133,10 +106,6 @@ dtb_found: LONG_S a2, fw_arg2 LONG_S a3, fw_arg3 -#ifdef CONFIG_USE_OF - LONG_S t2, fw_passed_dtb -#endif - MTC0 zero, CP0_CONTEXT # clear context register #ifdef CONFIG_64BIT MTC0 zero, CP0_XCONTEXT diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c index 7e1f8e2..3785c72 100644 --- a/arch/mips/kernel/setup.c +++ b/arch/mips/kernel/setup.c @@ -792,10 +792,6 @@ void __init setup_arch(char **cmdline_p) unsigned long kernelsp[NR_CPUS]; unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; -#ifdef CONFIG_USE_OF -unsigned long fw_passed_dtb; -#endif - #ifdef CONFIG_DEBUG_FS struct dentry *mips_debugfs_dir; static int __init debugfs_mips(void) diff --git a/arch/mips/lantiq/prom.c b/arch/mips/lantiq/prom.c index 36393712..bc9f58f 100644 --- a/arch/mips/lantiq/prom.c +++ b/arch/mips/lantiq/prom.c @@ -73,11 +73,8 @@ void __init plat_mem_setup(void) set_io_port_base((unsigned long) KSEG1); - if (fw_passed_dtb) /* UHI interface */ - dtb = (void *)fw_passed_dtb; - else if (&__dtb_start != &__dtb_end) - dtb = (void *)__dtb_start; - else + dtb = get_fdt(); + if (dtb == NULL) panic("no dtb found"); /* diff --git a/arch/mips/pic32/pic32mzda/init.c b/arch/mips/pic32/pic32mzda/init.c index 1897aa8..764f2d0 100644 --- a/arch/mips/pic32/pic32mzda/init.c +++ b/arch/mips/pic32/pic32mzda/init.c @@ -21,24 +21,11 @@ const char *get_system_type(void) return "PIC32MZDA"; } -static ulong get_fdtaddr(void) -{ - ulong ftaddr = 0; - - if (fw_passed_dtb && !fw_arg2 && !fw_arg3) - return (ulong)fw_passed_dtb; - - if (&__dtb_start < &__dtb_end) - ftaddr = (ulong)__dtb_start; - - return ftaddr; -} - void __init plat_mem_setup(void) { void *dtb; - dtb = (void *)get_fdtaddr(); + dtb = get_fdt(); if (!dtb) { pr_err("pic32: no DTB found.\n"); return; diff --git a/arch/mips/ralink/of.c b/arch/mips/ralink/of.c index 2c9af61..8286c35 100644 --- a/arch/mips/ralink/of.c +++ b/arch/mips/ralink/of.c @@ -64,20 +64,15 @@ static int __init early_init_dt_find_memory(unsigned long node, void __init plat_mem_setup(void) { - void *dtb = NULL; + void *dtb; set_io_port_base(KSEG1); /* * Load the builtin devicetree. This causes the chosen node to be - * parsed resulting in our memory appearing. fw_passed_dtb is used - * by CONFIG_MIPS_APPENDED_RAW_DTB as well. + * parsed resulting in our memory appearing. */ - if (fw_passed_dtb) - dtb = (void *)fw_passed_dtb; - else if (&__dtb_start != &__dtb_end) - dtb = (void *)__dtb_start; - + dtb = get_fdt(); __dt_setup_arch(dtb); of_scan_flat_dt(early_init_dt_find_memory, NULL);