[U-Boot] [PATCH 13/16] ARM: omap5: add hooks for cpu/SoC fdt fixups

Daniel Allred
2016-04-11T23:37:15Z

Adds an fdt.c file in that defines the ft_cpu_setup() function,
which should be called from a board-specific ft_board_setup()).
This ft_cpu_setup() will currently do nothing for non-secure (GP)
devices but contains pertinent updates for booting on secure (HS)
devices.

Update the omap5 Makefile to include the fdt.c in the build.

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Madan Srinivas <madans@ti.com>
---
arch/arm/cpu/armv7/omap5/Makefile | 1 +
arch/arm/cpu/armv7/omap5/fdt.c | 183 ++++++++++++++++++++++++++++++++++++++
2 files changed, 184 insertions(+)
create mode 100644 arch/arm/cpu/armv7/omap5/fdt.c

diff --git a/arch/arm/cpu/armv7/omap5/Makefile b/arch/arm/cpu/armv7/omap5/Makefile
index f2930d5..3caba86 100644
--- a/arch/arm/cpu/armv7/omap5/Makefile
+++ b/arch/arm/cpu/armv7/omap5/Makefile
@@ -12,4 +12,5 @@ obj-y += sdram.o
obj-y += prcm-regs.o
obj-y += hw_data.o
obj-y += abb.o
+obj-y += fdt.o
obj-$(CONFIG_IODELAY_RECALIBRATION) += dra7xx_iodelay.o
diff --git a/arch/arm/cpu/armv7/omap5/fdt.c b/arch/arm/cpu/armv7/omap5/fdt.c
new file mode 100644
index 0000000..f2f40f0
--- /dev/null
+++ b/arch/arm/cpu/armv7/omap5/fdt.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright 2016 Texas Instruments, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <libfdt.h>
+#include <fdt_support.h>
+#include <malloc.h>
+
+#include <asm/omap_common.h>
+#include <asm/arch-omap5/sys_proto.h>
+
+#ifdef CONFIG_TI_SECURE_DEVICE
+
+/* Give zero values if not already defined */
+#ifndef CONFIG_SECURE_BOOT_SRAM
+#define CONFIG_SECURE_BOOT_SRAM (0)
+#endif
+#ifndef CONFIG_SECURE_RUN_SRAM
+#define CONFIG_SECURE_RUN_SRAM (0)
+#endif
+
+static u32 hs_irq_skip[] = {
+ 8, /* Secure violation reporting interrupt */
+ 15, /* One interrupt for SDMA by secure world */
+ 118 /* One interrupt for Crypto DMA by secure world */
+};
+
+static int ft_hs_fixup_crossbar(void *fdt, bd_t *bd)
+{
+ const char *path;
+ int offs;
+ int ret;
+ int len, i, old_cnt, new_cnt;
+ u32 *temp;
+ const u32 *p_data;
+
+ /*
+ * Increase the size of the fdt
+ * so we have some breathing room
+ */
+ ret = fdt_increase_size(fdt, 512);
+ if (ret < 0) {
+ printf("Could not increase size of device tree: %s\n",
+ fdt_strerror(ret));
+ return ret;
+ }
+
+ /* Reserve IRQs that are used/needed by secure world */
+ path = "/ocp/crossbar";
+ offs = fdt_path_offset(fdt, path);
+ if (offs < 0) {
+ debug("Node %s not found.\n", path);
+ return 0;
+ }
+
+ /* Get current entries */
+ p_data = fdt_getprop(fdt, offs, "ti,irqs-skip", &len);
+ if (p_data)
+ old_cnt = len / sizeof(u32);
+ else
+ old_cnt = 0;
+
+ new_cnt = sizeof(hs_irq_skip) /
+ sizeof(hs_irq_skip[0]);
+
+ /* Create new/updated skip list for HS parts */
+ temp = malloc(sizeof(u32) * (old_cnt + new_cnt));
+ for (i = 0; i < new_cnt; i++)
+ temp[i] = cpu_to_fdt32(hs_irq_skip[i]);
+ for (i = 0; i < old_cnt; i++)
+ temp[i + new_cnt] = p_data[i];
+
+ /* Blow away old data and set new data */
+ fdt_delprop(fdt, offs, "ti,irqs-skip");
+ ret = fdt_setprop(fdt, offs, "ti,irqs-skip",
+ temp,
+ (old_cnt + new_cnt) * sizeof(u32));
+ free(temp);
+
+ /* Check if the update worked */
+ if (ret < 0) {
+ printf("Could not add ti,irqs-skip property to node %s: %s\n",
+ path, fdt_strerror(ret));
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ft_hs_disable_rng(void *fdt, bd_t *bd)
+{
+ const char *path;
+ int offs;
+ int ret;
+
+ /* Make HW RNG reserved for secure world use */
+ path = "/ocp/rng";
+ offs = fdt_path_offset(fdt, path);
+ if (offs < 0) {
+ debug("Node %s not found.\n", path);
+ return 0;
+ }
+ ret = fdt_setprop_string(fdt, offs,
+ "status", "disabled");
+ if (ret < 0) {
+ printf("Could not add status property to node %s: %s\n",
+ path, fdt_strerror(ret));
+ return ret;
+ }
+ return 0;
+}
+
+#if (CONFIG_SECURE_BOOT_SRAM != 0) || (CONFIG_SECURE_RUN_SRAM != 0)
+static int ft_hs_fixup_sram(void *fdt, bd_t *bd)
+{
+ const char *path;
+ int offs;
+ int ret;
+ u32 temp[2];
+
+ /*
+ * Update SRAM reservations on secure devices. The OCMC RAM
+ * is always reserved for secure use from the start of that
+ * memory region
+ */
+ path = "/ocp/ocmcram@40300000/sram-hs";
+ offs = fdt_path_offset(fdt, path);
+ if (offs < 0) {
+ debug("Node %s not found.\n", path);
+ return 0;
+ }
+
+ /* relative start offset */
+ temp[0] = cpu_to_fdt32(0);
+ /* reservation size */
+ temp[1] = cpu_to_fdt32(max(CONFIG_SECURE_BOOT_SRAM,
+ CONFIG_SECURE_RUN_SRAM));
+ fdt_delprop(fdt, offs, "reg");
+ ret = fdt_setprop(fdt, offs, "reg", temp, 2 * sizeof(u32));
+ if (ret < 0) {
+ printf("Could not add reg property to node %s: %s\n",
+ path, fdt_strerror(ret));
+ return ret;
+ }
+
+ return 0;
+}
+#else
+static int ft_hs_fixup_sram(void *fdt, bd_t *bd) { return 0; }
+#endif
+
+static void ft_hs_fixups(void *fdt, bd_t *bd)
+{
+ /* Check we are running on an HS/EMU device type */
+ if (GP_DEVICE != get_device_type()) {
+ if ((ft_hs_fixup_crossbar(fdt, bd) == 0) &&
+ (ft_hs_disable_rng(fdt, bd) == 0) &&
+ (ft_hs_fixup_sram(fdt, bd) == 0))
+ return;
+ } else {
+ printf("ERROR: Incorrect device type (GP) detected!");
+ }
+ /* Fixup failed or wrong device type */
+ hang();
+}
+#else
+static void ft_hs_fixups(void *fdt, bd_t *bd)
+{
+}
+#endif
+
+/*
+ * Place for general cpu/SoC FDT fixups. Board specific
+ * fixups should remain in the board files which is where
+ * this function should be called from.
+ */
+void ft_cpu_setup(void *fdt, bd_t *bd)
+{
+ ft_hs_fixups(fdt, bd);
+}
--
1.9.1