329 lines
8.2 KiB
C
329 lines
8.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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* Copyright (C) 2009-2012 Texas Instruments
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* Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.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 "iomap.h"
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#include "prm2xxx_3xxx.h"
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#include "sdrc.h"
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#include "sram.h"
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#define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800)
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#define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000)
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#define SRAM_BOOTLOADER_SZ 0x00
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#define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048)
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#define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050)
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#define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058)
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#define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848)
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#define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850)
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#define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858)
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#define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880)
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#define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048)
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#define GP_DEVICE 0x300
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#define ROUND_DOWN(value,boundary) ((value) & (~((boundary)-1)))
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static unsigned long omap_sram_start;
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static unsigned long omap_sram_size;
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static void __iomem *omap_sram_base;
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static unsigned long omap_sram_skip;
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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 SRAM context is lost during off-idle and stack
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* needs to be reset.
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*/
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static void omap_sram_reset(void)
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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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/*
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* Depending on the target RAMFS firewall setup, the public usable amount of
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* SRAM varies. The default accessible size for all device types is 2k. A GP
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* device allows ARM11 but not other initiators for full size. This
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* functionality seems ok until some nice security API happens.
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*/
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static int is_sram_locked(void)
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{
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if (OMAP2_DEVICE_TYPE_GP == omap_type()) {
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/* RAMFW: R/W access to all initiators for all qualifier sets */
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if (cpu_is_omap242x()) {
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writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
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writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
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writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
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}
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if (cpu_is_omap34xx()) {
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writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
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writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
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writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
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writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2);
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writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
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}
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return 0;
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} else
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return 1; /* assume locked with no PPA or security driver */
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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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*/
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static void __init omap_detect_sram(void)
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{
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omap_sram_skip = SRAM_BOOTLOADER_SZ;
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if (is_sram_locked()) {
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if (cpu_is_omap34xx()) {
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omap_sram_start = OMAP3_SRAM_PUB_PA;
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if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
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(omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
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omap_sram_size = 0x7000; /* 28K */
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omap_sram_skip += SZ_16K;
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} else {
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omap_sram_size = 0x8000; /* 32K */
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}
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} else {
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omap_sram_start = OMAP2_SRAM_PUB_PA;
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omap_sram_size = 0x800; /* 2K */
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}
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} else {
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if (cpu_is_omap34xx()) {
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omap_sram_start = OMAP3_SRAM_PA;
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omap_sram_size = 0x10000; /* 64K */
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} else {
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omap_sram_start = OMAP2_SRAM_PA;
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if (cpu_is_omap242x())
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omap_sram_size = 0xa0000; /* 640K */
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else if (cpu_is_omap243x())
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omap_sram_size = 0x10000; /* 64K */
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}
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}
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}
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/*
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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 omap2_map_sram(void)
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{
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unsigned long base;
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int pages;
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int cached = 1;
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if (cpu_is_omap34xx()) {
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/*
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* SRAM must be marked as non-cached on OMAP3 since the
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* CORE DPLL M2 divider change code (in SRAM) runs with the
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* SDRAM controller disabled, and if it is marked cached,
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* the ARM may attempt to write cache lines back to SDRAM
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* which will cause the system to hang.
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*/
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cached = 0;
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}
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if (omap_sram_size == 0)
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return;
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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, cached);
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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_reset();
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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 (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
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u32 base_cs, u32 force_unlock);
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void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
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u32 base_cs, u32 force_unlock)
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{
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BUG_ON(!_omap2_sram_ddr_init);
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_omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
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base_cs, force_unlock);
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}
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static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
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u32 mem_type);
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void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
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{
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BUG_ON(!_omap2_sram_reprogram_sdrc);
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_omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
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}
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static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
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u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
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{
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BUG_ON(!_omap2_set_prcm);
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return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
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}
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#ifdef CONFIG_SOC_OMAP2420
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static int __init omap242x_sram_init(void)
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{
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_omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
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omap242x_sram_ddr_init_sz);
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_omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
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omap242x_sram_reprogram_sdrc_sz);
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_omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
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omap242x_sram_set_prcm_sz);
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return 0;
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}
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#else
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static inline int omap242x_sram_init(void)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_SOC_OMAP2430
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static int __init omap243x_sram_init(void)
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{
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_omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
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omap243x_sram_ddr_init_sz);
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_omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
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omap243x_sram_reprogram_sdrc_sz);
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_omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
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omap243x_sram_set_prcm_sz);
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return 0;
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}
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#else
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static inline int omap243x_sram_init(void)
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{
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return 0;
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}
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#endif
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#ifdef CONFIG_ARCH_OMAP3
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void omap3_sram_restore_context(void)
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{
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omap_sram_reset();
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omap_push_sram_idle();
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}
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static inline int omap34xx_sram_init(void)
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{
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omap3_sram_restore_context();
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return 0;
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}
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#else
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static inline int omap34xx_sram_init(void)
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{
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return 0;
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}
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#endif /* CONFIG_ARCH_OMAP3 */
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int __init omap_sram_init(void)
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{
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omap_detect_sram();
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omap2_map_sram();
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if (cpu_is_omap242x())
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omap242x_sram_init();
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else if (cpu_is_omap2430())
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omap243x_sram_init();
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else if (cpu_is_omap34xx())
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omap34xx_sram_init();
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return 0;
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}
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