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152 lines
3.6 KiB
152 lines
3.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* OMAP SRAM detection and management |
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* |
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* Copyright (C) 2005 Nokia Corporation |
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* Written by Tony Lindgren <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <asm/fncpy.h> |
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#include <asm/tlb.h> |
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#include <asm/cacheflush.h> |
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#include <asm/set_memory.h> |
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#include <asm/mach/map.h> |
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#include "soc.h" |
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#include "sram.h" |
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#define OMAP1_SRAM_PA 0x20000000 |
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#define SRAM_BOOTLOADER_SZ 0x80 |
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#define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1))) |
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static void __iomem *omap_sram_base; |
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static unsigned long omap_sram_start; |
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static unsigned long omap_sram_skip; |
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static unsigned long omap_sram_size; |
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static void __iomem *omap_sram_ceil; |
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/* |
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* Memory allocator for SRAM: calculates the new ceiling address |
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* for pushing a function using the fncpy API. |
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* |
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* Note that fncpy requires the returned address to be aligned |
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* to an 8-byte boundary. |
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*/ |
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static void *omap_sram_push_address(unsigned long size) |
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{ |
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unsigned long available, new_ceil = (unsigned long)omap_sram_ceil; |
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available = omap_sram_ceil - (omap_sram_base + omap_sram_skip); |
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if (size > available) { |
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pr_err("Not enough space in SRAM\n"); |
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return NULL; |
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} |
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new_ceil -= size; |
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new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN); |
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omap_sram_ceil = IOMEM(new_ceil); |
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return (void __force *)omap_sram_ceil; |
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} |
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void *omap_sram_push(void *funcp, unsigned long size) |
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{ |
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void *sram; |
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unsigned long base; |
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int pages; |
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void *dst = NULL; |
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sram = omap_sram_push_address(size); |
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if (!sram) |
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return NULL; |
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base = (unsigned long)sram & PAGE_MASK; |
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pages = PAGE_ALIGN(size) / PAGE_SIZE; |
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set_memory_rw(base, pages); |
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dst = fncpy(sram, funcp, size); |
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set_memory_ro(base, pages); |
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set_memory_x(base, pages); |
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return dst; |
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} |
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/* |
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* The amount of SRAM depends on the core type. |
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* Note that we cannot try to test for SRAM here because writes |
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* to secure SRAM will hang the system. Also the SRAM is not |
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* yet mapped at this point. |
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* Note that we cannot use ioremap for SRAM, as clock init needs SRAM early. |
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*/ |
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static void __init omap_detect_and_map_sram(void) |
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{ |
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unsigned long base; |
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int pages; |
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omap_sram_skip = SRAM_BOOTLOADER_SZ; |
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omap_sram_start = OMAP1_SRAM_PA; |
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if (cpu_is_omap7xx()) |
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omap_sram_size = 0x32000; /* 200K */ |
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else if (cpu_is_omap15xx()) |
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omap_sram_size = 0x30000; /* 192K */ |
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else if (cpu_is_omap1610() || cpu_is_omap1611() || |
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cpu_is_omap1621() || cpu_is_omap1710()) |
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omap_sram_size = 0x4000; /* 16K */ |
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else { |
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pr_err("Could not detect SRAM size\n"); |
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omap_sram_size = 0x4000; |
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} |
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omap_sram_start = ROUND_DOWN(omap_sram_start, PAGE_SIZE); |
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omap_sram_base = __arm_ioremap_exec(omap_sram_start, omap_sram_size, 1); |
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if (!omap_sram_base) { |
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pr_err("SRAM: Could not map\n"); |
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return; |
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} |
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omap_sram_ceil = omap_sram_base + omap_sram_size; |
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/* |
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* Looks like we need to preserve some bootloader code at the |
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* beginning of SRAM for jumping to flash for reboot to work... |
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*/ |
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memset_io(omap_sram_base + omap_sram_skip, 0, |
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omap_sram_size - omap_sram_skip); |
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base = (unsigned long)omap_sram_base; |
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pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE; |
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set_memory_ro(base, pages); |
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set_memory_x(base, pages); |
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} |
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static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl); |
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void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl) |
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{ |
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BUG_ON(!_omap_sram_reprogram_clock); |
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/* On 730, bit 13 must always be 1 */ |
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if (cpu_is_omap7xx()) |
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ckctl |= 0x2000; |
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_omap_sram_reprogram_clock(dpllctl, ckctl); |
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} |
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int __init omap1_sram_init(void) |
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{ |
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omap_detect_and_map_sram(); |
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_omap_sram_reprogram_clock = |
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omap_sram_push(omap1_sram_reprogram_clock, |
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omap1_sram_reprogram_clock_sz); |
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return 0; |
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}
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