^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/arch/arm/plat-omap/sram.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * OMAP SRAM detection and management
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2005 Nokia Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Written by Tony Lindgren <tony@atomide.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2009-2012 Texas Instruments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #undef DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/fncpy.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/set_memory.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <asm/mach/map.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <plat/sram.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static void __iomem *omap_sram_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) static unsigned long omap_sram_skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static unsigned long omap_sram_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static void __iomem *omap_sram_ceil;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * Memory allocator for SRAM: calculates the new ceiling address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * for pushing a function using the fncpy API.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * Note that fncpy requires the returned address to be aligned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * to an 8-byte boundary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static void *omap_sram_push_address(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) unsigned long available, new_ceil = (unsigned long)omap_sram_ceil;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) available = omap_sram_ceil - (omap_sram_base + omap_sram_skip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (size > available) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) pr_err("Not enough space in SRAM\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) new_ceil -= size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) omap_sram_ceil = IOMEM(new_ceil);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return (void *)omap_sram_ceil;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) void *omap_sram_push(void *funcp, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) void *sram;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned long base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) int pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void *dst = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) sram = omap_sram_push_address(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (!sram)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) base = (unsigned long)sram & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) pages = PAGE_ALIGN(size) / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) set_memory_rw(base, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) dst = fncpy(sram, funcp, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) set_memory_ro(base, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) set_memory_x(base, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * The SRAM context is lost during off-idle and stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * needs to be reset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) void omap_sram_reset(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) omap_sram_ceil = omap_sram_base + omap_sram_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) void __init omap_map_sram(unsigned long start, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) unsigned long skip, int cached)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unsigned long base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) int pages;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) start = ROUND_DOWN(start, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) omap_sram_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) omap_sram_skip = skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) omap_sram_base = __arm_ioremap_exec(start, size, cached);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!omap_sram_base) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) pr_err("SRAM: Could not map\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) omap_sram_reset();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * Looks like we need to preserve some bootloader code at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * beginning of SRAM for jumping to flash for reboot to work...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) memset_io(omap_sram_base + omap_sram_skip, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) omap_sram_size - omap_sram_skip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) base = (unsigned long)omap_sram_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) set_memory_ro(base, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) set_memory_x(base, pages);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags