153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
// 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 <tony@atomide.com>
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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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