ARM: omap5: add hooks for cpu/SoC fdt fixups
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> Reviewed-by: Tom Rini <trini@konsulko.com>
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@ -12,4 +12,5 @@ obj-y += sdram.o
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obj-y += prcm-regs.o
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obj-y += hw_data.o
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obj-y += abb.o
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obj-y += fdt.o
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obj-$(CONFIG_IODELAY_RECALIBRATION) += dra7xx_iodelay.o
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184
arch/arm/cpu/armv7/omap5/fdt.c
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184
arch/arm/cpu/armv7/omap5/fdt.c
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@ -0,0 +1,184 @@
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/*
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* Copyright 2016 Texas Instruments, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <libfdt.h>
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#include <fdt_support.h>
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#include <malloc.h>
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#include <asm/omap_common.h>
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#include <asm/arch-omap5/sys_proto.h>
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#ifdef CONFIG_TI_SECURE_DEVICE
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/* Give zero values if not already defined */
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#ifndef TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ
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#define TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ (0)
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#endif
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#ifndef CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ
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#define CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ (0)
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#endif
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static u32 hs_irq_skip[] = {
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8, /* Secure violation reporting interrupt */
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15, /* One interrupt for SDMA by secure world */
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118 /* One interrupt for Crypto DMA by secure world */
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};
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static int ft_hs_fixup_crossbar(void *fdt, bd_t *bd)
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{
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const char *path;
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int offs;
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int ret;
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int len, i, old_cnt, new_cnt;
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u32 *temp;
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const u32 *p_data;
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/*
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* Increase the size of the fdt
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* so we have some breathing room
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*/
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ret = fdt_increase_size(fdt, 512);
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if (ret < 0) {
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printf("Could not increase size of device tree: %s\n",
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fdt_strerror(ret));
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return ret;
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}
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/* Reserve IRQs that are used/needed by secure world */
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path = "/ocp/crossbar";
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offs = fdt_path_offset(fdt, path);
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if (offs < 0) {
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debug("Node %s not found.\n", path);
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return 0;
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}
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/* Get current entries */
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p_data = fdt_getprop(fdt, offs, "ti,irqs-skip", &len);
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if (p_data)
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old_cnt = len / sizeof(u32);
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else
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old_cnt = 0;
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new_cnt = sizeof(hs_irq_skip) /
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sizeof(hs_irq_skip[0]);
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/* Create new/updated skip list for HS parts */
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temp = malloc(sizeof(u32) * (old_cnt + new_cnt));
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for (i = 0; i < new_cnt; i++)
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temp[i] = cpu_to_fdt32(hs_irq_skip[i]);
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for (i = 0; i < old_cnt; i++)
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temp[i + new_cnt] = p_data[i];
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/* Blow away old data and set new data */
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fdt_delprop(fdt, offs, "ti,irqs-skip");
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ret = fdt_setprop(fdt, offs, "ti,irqs-skip",
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temp,
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(old_cnt + new_cnt) * sizeof(u32));
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free(temp);
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/* Check if the update worked */
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if (ret < 0) {
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printf("Could not add ti,irqs-skip property to node %s: %s\n",
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path, fdt_strerror(ret));
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return ret;
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}
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return 0;
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}
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static int ft_hs_disable_rng(void *fdt, bd_t *bd)
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{
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const char *path;
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int offs;
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int ret;
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/* Make HW RNG reserved for secure world use */
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path = "/ocp/rng";
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offs = fdt_path_offset(fdt, path);
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if (offs < 0) {
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debug("Node %s not found.\n", path);
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return 0;
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}
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ret = fdt_setprop_string(fdt, offs,
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"status", "disabled");
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if (ret < 0) {
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printf("Could not add status property to node %s: %s\n",
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path, fdt_strerror(ret));
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return ret;
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}
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return 0;
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}
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#if ((TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ != 0) || \
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(CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ != 0))
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static int ft_hs_fixup_sram(void *fdt, bd_t *bd)
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{
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const char *path;
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int offs;
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int ret;
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u32 temp[2];
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/*
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* Update SRAM reservations on secure devices. The OCMC RAM
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* is always reserved for secure use from the start of that
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* memory region
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*/
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path = "/ocp/ocmcram@40300000/sram-hs";
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offs = fdt_path_offset(fdt, path);
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if (offs < 0) {
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debug("Node %s not found.\n", path);
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return 0;
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}
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/* relative start offset */
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temp[0] = cpu_to_fdt32(0);
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/* reservation size */
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temp[1] = cpu_to_fdt32(max(TI_OMAP5_SECURE_BOOT_RESV_SRAM_SZ,
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CONFIG_SECURE_RUNTIME_RESV_SRAM_SZ));
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fdt_delprop(fdt, offs, "reg");
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ret = fdt_setprop(fdt, offs, "reg", temp, 2 * sizeof(u32));
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if (ret < 0) {
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printf("Could not add reg property to node %s: %s\n",
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path, fdt_strerror(ret));
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return ret;
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}
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return 0;
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}
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#else
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static int ft_hs_fixup_sram(void *fdt, bd_t *bd) { return 0; }
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#endif
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static void ft_hs_fixups(void *fdt, bd_t *bd)
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{
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/* Check we are running on an HS/EMU device type */
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if (GP_DEVICE != get_device_type()) {
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if ((ft_hs_fixup_crossbar(fdt, bd) == 0) &&
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(ft_hs_disable_rng(fdt, bd) == 0) &&
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(ft_hs_fixup_sram(fdt, bd) == 0))
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return;
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} else {
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printf("ERROR: Incorrect device type (GP) detected!");
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}
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/* Fixup failed or wrong device type */
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hang();
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}
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#else
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static void ft_hs_fixups(void *fdt, bd_t *bd)
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{
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}
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#endif
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/*
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* Place for general cpu/SoC FDT fixups. Board specific
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* fixups should remain in the board files which is where
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* this function should be called from.
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*/
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void ft_cpu_setup(void *fdt, bd_t *bd)
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{
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ft_hs_fixups(fdt, bd);
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}
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