1 files changed, 305 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/sram.c b/arch/arm/mach-omap2/sram.c
new file mode 100644
index 000000000000..0ff0f068bea8
--- /dev/null
+++ b/arch/arm/mach-omap2/sram.c
@@ -0,0 +1,305 @@
+/*
+ *
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.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)
+#ifdef CONFIG_OMAP4_ERRATA_I688
+#define OMAP4_SRAM_PUB_PA       OMAP4_SRAM_PA
+#else
+#define OMAP4_SRAM_PUB_PA       (OMAP4_SRAM_PA + 0x4000)
+#endif
+#define OMAP5_SRAM_PA           0x40300000
+
+#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_skip;
+static unsigned long 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 (OMAP2_DEVICE_TYPE_GP == omap_type()) {
+                /* RAMFW: R/W access to all initiators for all qualifier sets */
+                if (cpu_is_omap242x()) {
+                        __raw_writel(0xFF, OMAP24XX_VA_REQINFOPERM0); /* all q-vects */
+                        __raw_writel(0xCFDE, OMAP24XX_VA_READPERM0);  /* all i-read */
+                        __raw_writel(0xCFDE, OMAP24XX_VA_WRITEPERM0); /* all i-write */
+                }
+                if (cpu_is_omap34xx()) {
+                        __raw_writel(0xFFFF, OMAP34XX_VA_REQINFOPERM0); /* all q-vects */
+                        __raw_writel(0xFFFF, OMAP34XX_VA_READPERM0);  /* all i-read */
+                        __raw_writel(0xFFFF, OMAP34XX_VA_WRITEPERM0); /* all i-write */
+                        __raw_writel(0x0, OMAP34XX_VA_ADDR_MATCH2);
+                        __raw_writel(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 if (cpu_is_omap44xx()) {
+                        omap_sram_start = OMAP4_SRAM_PUB_PA;
+                        omap_sram_size = 0xa000; /* 40K */
+                } else if (soc_is_omap54xx()) {
+                        omap_sram_start = OMAP5_SRAM_PA;
+                        omap_sram_size = SZ_128K; /* 128KB */
+                } else {
+                        omap_sram_start = OMAP2_SRAM_PUB_PA;
+                        omap_sram_size = 0x800; /* 2K */
+                }
+        } else {
+                if (soc_is_am33xx()) {
+                        omap_sram_start = AM33XX_SRAM_PA;
+                        omap_sram_size = 0x10000; /* 64K */
+                } else if (cpu_is_omap34xx()) {
+                        omap_sram_start = OMAP3_SRAM_PA;
+                        omap_sram_size = 0x10000; /* 64K */
+                } else if (cpu_is_omap44xx()) {
+                        omap_sram_start = OMAP4_SRAM_PA;
+                        omap_sram_size = 0xe000; /* 56K */
+                } else if (soc_is_omap54xx()) {
+                        omap_sram_start = OMAP5_SRAM_PA;
+                        omap_sram_size = SZ_128K; /* 128KB */
+                } 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)
+{
+        int cached = 1;
+
+#ifdef CONFIG_OMAP4_ERRATA_I688
+        if (cpu_is_omap44xx()) {
+                omap_sram_start += PAGE_SIZE;
+                omap_sram_size -= SZ_16K;
+        }
+#endif
+        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;
+        }
+
+        omap_map_sram(omap_sram_start, omap_sram_size,
+                        omap_sram_skip, cached);
+}
+
+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
+
+static u32 (*_omap3_sram_configure_core_dpll)(
+                        u32 m2, u32 unlock_dll, u32 f, u32 inc,
+                        u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
+                        u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
+                        u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
+                        u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
+
+u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
+                        u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
+                        u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
+                        u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
+                        u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
+{
+        BUG_ON(!_omap3_sram_configure_core_dpll);
+        return _omap3_sram_configure_core_dpll(
+                        m2, unlock_dll, f, inc,
+                        sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
+                        sdrc_actim_ctrl_b_0, sdrc_mr_0,
+                        sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
+                        sdrc_actim_ctrl_b_1, sdrc_mr_1);
+}
+
+void omap3_sram_restore_context(void)
+{
+        omap_sram_reset();
+
+        _omap3_sram_configure_core_dpll =
+                omap_sram_push(omap3_sram_configure_core_dpll,
+                               omap3_sram_configure_core_dpll_sz);
+        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 */
+
+static inline int am33xx_sram_init(void)
+{
+        return 0;
+}
+
+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 (soc_is_am33xx())
+                am33xx_sram_init();
+        else if (cpu_is_omap34xx())
+                omap34xx_sram_init();
+
+        return 0;
+}