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-rw-r--r--arch/arm/mach-omap2/sram.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/sram.c b/arch/arm/mach-omap2/sram.c
new file mode 100644
index 0000000000..898b011ae8
--- /dev/null
+++ b/arch/arm/mach-omap2/sram.c
@@ -0,0 +1,326 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ * OMAP SRAM detection and management
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Copyright (C) 2009-2012 Texas Instruments
+ * Added OMAP4/5 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/set_memory.h>
+
+#include <asm/fncpy.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#include <asm/mach/map.h>
+
+#include "soc.h"
+#include "iomap.h"
+#include "prm2xxx_3xxx.h"
+#include "sdrc.h"
+#include "sram.h"
+
+#define OMAP2_SRAM_PUB_PA (OMAP2_SRAM_PA + 0xf800)
+#define OMAP3_SRAM_PUB_PA (OMAP3_SRAM_PA + 0x8000)
+
+#define SRAM_BOOTLOADER_SZ 0x00
+
+#define OMAP24XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68005048)
+#define OMAP24XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68005050)
+#define OMAP24XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68005058)
+
+#define OMAP34XX_VA_REQINFOPERM0 OMAP2_L3_IO_ADDRESS(0x68012848)
+#define OMAP34XX_VA_READPERM0 OMAP2_L3_IO_ADDRESS(0x68012850)
+#define OMAP34XX_VA_WRITEPERM0 OMAP2_L3_IO_ADDRESS(0x68012858)
+#define OMAP34XX_VA_ADDR_MATCH2 OMAP2_L3_IO_ADDRESS(0x68012880)
+#define OMAP34XX_VA_SMS_RG_ATT0 OMAP2_L3_IO_ADDRESS(0x6C000048)
+
+#define GP_DEVICE 0x300
+
+#define ROUND_DOWN(value, boundary) ((value) & (~((boundary) - 1)))
+
+static unsigned long omap_sram_start;
+static unsigned long omap_sram_size;
+static void __iomem *omap_sram_base;
+static unsigned long omap_sram_skip;
+static void __iomem *omap_sram_ceil;
+
+/*
+ * Memory allocator for SRAM: calculates the new ceiling address
+ * for pushing a function using the fncpy API.
+ *
+ * Note that fncpy requires the returned address to be aligned
+ * to an 8-byte boundary.
+ */
+static void *omap_sram_push_address(unsigned long size)
+{
+ unsigned long available, new_ceil = (unsigned long)omap_sram_ceil;
+
+ available = omap_sram_ceil - (omap_sram_base + omap_sram_skip);
+
+ if (size > available) {
+ pr_err("Not enough space in SRAM\n");
+ return NULL;
+ }
+
+ new_ceil -= size;
+ new_ceil = ROUND_DOWN(new_ceil, FNCPY_ALIGN);
+ omap_sram_ceil = IOMEM(new_ceil);
+
+ return (void __force *)omap_sram_ceil;
+}
+
+void *omap_sram_push(void *funcp, unsigned long size)
+{
+ void *sram;
+ unsigned long base;
+ int pages;
+ void *dst = NULL;
+
+ sram = omap_sram_push_address(size);
+ if (!sram)
+ return NULL;
+
+ base = (unsigned long)sram & PAGE_MASK;
+ pages = PAGE_ALIGN(size) / PAGE_SIZE;
+
+ set_memory_rw(base, pages);
+
+ dst = fncpy(sram, funcp, size);
+
+ set_memory_rox(base, pages);
+
+ return dst;
+}
+
+/*
+ * The SRAM context is lost during off-idle and stack
+ * needs to be reset.
+ */
+static void omap_sram_reset(void)
+{
+ omap_sram_ceil = omap_sram_base + omap_sram_size;
+}
+
+/*
+ * Depending on the target RAMFS firewall setup, the public usable amount of
+ * SRAM varies. The default accessible size for all device types is 2k. A GP
+ * device allows ARM11 but not other initiators for full size. This
+ * functionality seems ok until some nice security API happens.
+ */
+static int is_sram_locked(void)
+{
+ if (omap_type() == OMAP2_DEVICE_TYPE_GP) {
+ /* RAMFW: R/W access to all initiators for all qualifier sets */
+ if (cpu_is_omap242x()) {
+ writel_relaxed(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
+ writel_relaxed(0xCFDE, OMAP24XX_VA_READPERM0); /* all i-read */
+ writel_relaxed(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
+ }
+ if (cpu_is_omap34xx()) {
+ writel_relaxed(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
+ writel_relaxed(0xFFFF, OMAP34XX_VA_READPERM0); /* all i-read */
+ writel_relaxed(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
+ writel_relaxed(0x0, OMAP34XX_VA_ADDR_MATCH2);
+ writel_relaxed(0xFFFFFFFF, OMAP34XX_VA_SMS_RG_ATT0);
+ }
+ return 0;
+ } else
+ return 1; /* assume locked with no PPA or security driver */
+}
+
+/*
+ * The amount of SRAM depends on the core type.
+ * Note that we cannot try to test for SRAM here because writes
+ * to secure SRAM will hang the system. Also the SRAM is not
+ * yet mapped at this point.
+ */
+static void __init omap_detect_sram(void)
+{
+ omap_sram_skip = SRAM_BOOTLOADER_SZ;
+ if (is_sram_locked()) {
+ if (cpu_is_omap34xx()) {
+ omap_sram_start = OMAP3_SRAM_PUB_PA;
+ if ((omap_type() == OMAP2_DEVICE_TYPE_EMU) ||
+ (omap_type() == OMAP2_DEVICE_TYPE_SEC)) {
+ omap_sram_size = 0x7000; /* 28K */
+ omap_sram_skip += SZ_16K;
+ } else {
+ omap_sram_size = 0x8000; /* 32K */
+ }
+ } else {
+ omap_sram_start = OMAP2_SRAM_PUB_PA;
+ omap_sram_size = 0x800; /* 2K */
+ }
+ } else {
+ if (cpu_is_omap34xx()) {
+ omap_sram_start = OMAP3_SRAM_PA;
+ omap_sram_size = 0x10000; /* 64K */
+ } else {
+ omap_sram_start = OMAP2_SRAM_PA;
+ if (cpu_is_omap242x())
+ omap_sram_size = 0xa0000; /* 640K */
+ else if (cpu_is_omap243x())
+ omap_sram_size = 0x10000; /* 64K */
+ }
+ }
+}
+
+/*
+ * Note that we cannot use ioremap for SRAM, as clock init needs SRAM early.
+ */
+static void __init omap2_map_sram(void)
+{
+ unsigned long base;
+ int pages;
+ int cached = 1;
+
+ if (cpu_is_omap34xx()) {
+ /*
+ * SRAM must be marked as non-cached on OMAP3 since the
+ * CORE DPLL M2 divider change code (in SRAM) runs with the
+ * SDRAM controller disabled, and if it is marked cached,
+ * the ARM may attempt to write cache lines back to SDRAM
+ * which will cause the system to hang.
+ */
+ cached = 0;
+ }
+
+ if (omap_sram_size == 0)
+ return;
+
+ omap_sram_start = ROUND_DOWN(omap_sram_start, PAGE_SIZE);
+ omap_sram_base = __arm_ioremap_exec(omap_sram_start, omap_sram_size, cached);
+ if (!omap_sram_base) {
+ pr_err("SRAM: Could not map\n");
+ return;
+ }
+
+ omap_sram_reset();
+
+ /*
+ * Looks like we need to preserve some bootloader code at the
+ * beginning of SRAM for jumping to flash for reboot to work...
+ */
+ memset_io(omap_sram_base + omap_sram_skip, 0,
+ omap_sram_size - omap_sram_skip);
+
+ base = (unsigned long)omap_sram_base;
+ pages = PAGE_ALIGN(omap_sram_size) / PAGE_SIZE;
+
+ set_memory_rox(base, pages);
+}
+
+static void (*_omap2_sram_ddr_init)(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
+ u32 base_cs, u32 force_unlock);
+
+void omap2_sram_ddr_init(u32 *slow_dll_ctrl, u32 fast_dll_ctrl,
+ u32 base_cs, u32 force_unlock)
+{
+ BUG_ON(!_omap2_sram_ddr_init);
+ _omap2_sram_ddr_init(slow_dll_ctrl, fast_dll_ctrl,
+ base_cs, force_unlock);
+}
+
+static void (*_omap2_sram_reprogram_sdrc)(u32 perf_level, u32 dll_val,
+ u32 mem_type);
+
+void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val, u32 mem_type)
+{
+ BUG_ON(!_omap2_sram_reprogram_sdrc);
+ _omap2_sram_reprogram_sdrc(perf_level, dll_val, mem_type);
+}
+
+static u32 (*_omap2_set_prcm)(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
+
+u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass)
+{
+ BUG_ON(!_omap2_set_prcm);
+ return _omap2_set_prcm(dpll_ctrl_val, sdrc_rfr_val, bypass);
+}
+
+#ifdef CONFIG_SOC_OMAP2420
+static int __init omap242x_sram_init(void)
+{
+ _omap2_sram_ddr_init = omap_sram_push(omap242x_sram_ddr_init,
+ omap242x_sram_ddr_init_sz);
+
+ _omap2_sram_reprogram_sdrc = omap_sram_push(omap242x_sram_reprogram_sdrc,
+ omap242x_sram_reprogram_sdrc_sz);
+
+ _omap2_set_prcm = omap_sram_push(omap242x_sram_set_prcm,
+ omap242x_sram_set_prcm_sz);
+
+ return 0;
+}
+#else
+static inline int omap242x_sram_init(void)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_SOC_OMAP2430
+static int __init omap243x_sram_init(void)
+{
+ _omap2_sram_ddr_init = omap_sram_push(omap243x_sram_ddr_init,
+ omap243x_sram_ddr_init_sz);
+
+ _omap2_sram_reprogram_sdrc = omap_sram_push(omap243x_sram_reprogram_sdrc,
+ omap243x_sram_reprogram_sdrc_sz);
+
+ _omap2_set_prcm = omap_sram_push(omap243x_sram_set_prcm,
+ omap243x_sram_set_prcm_sz);
+
+ return 0;
+}
+#else
+static inline int omap243x_sram_init(void)
+{
+ return 0;
+}
+#endif
+
+#ifdef CONFIG_ARCH_OMAP3
+
+void omap3_sram_restore_context(void)
+{
+ omap_sram_reset();
+
+ omap_push_sram_idle();
+}
+
+static inline int omap34xx_sram_init(void)
+{
+ omap3_sram_restore_context();
+ return 0;
+}
+#else
+static inline int omap34xx_sram_init(void)
+{
+ return 0;
+}
+#endif /* CONFIG_ARCH_OMAP3 */
+
+int __init omap_sram_init(void)
+{
+ omap_detect_sram();
+ omap2_map_sram();
+
+ if (cpu_is_omap242x())
+ omap242x_sram_init();
+ else if (cpu_is_omap2430())
+ omap243x_sram_init();
+ else if (cpu_is_omap34xx())
+ omap34xx_sram_init();
+
+ return 0;
+}