mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-12 14:23:00 +00:00
df9041ec72
The rk3188 needs 3 U-Boot stages: a tpl living in 1KB of sram, a spl the resides in the rest of the sram and loads the regular U-Boot living in regular ram. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Kever Yang <kever.yang@rock-chips.com>
86 lines
1.9 KiB
C
86 lines
1.9 KiB
C
/*
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* (C) Copyright 2015 Google, 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 <debug_uart.h>
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#include <spl.h>
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#include <asm/io.h>
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#include <asm/arch/bootrom.h>
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#include <asm/arch/pmu_rk3188.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* track how often we were entered */
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static int rk3188_num_entries __attribute__ ((section(".data")));
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#define PMU_BASE 0x20004000
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#define TPL_ENTRY 0x10080C00
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static void jump_to_spl(void)
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{
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typedef void __noreturn (*image_entry_noargs_t)(void);
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struct rk3188_pmu * const pmu = (void *)PMU_BASE;
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image_entry_noargs_t tpl_entry =
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(image_entry_noargs_t)(unsigned long)TPL_ENTRY;
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/* Store the SAVE_SP_ADDR in a location shared with TPL. */
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writel(SAVE_SP_ADDR, &pmu->sys_reg[2]);
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tpl_entry();
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}
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void board_init_f(ulong dummy)
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{
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/* Example code showing how to enable the debug UART on RK3188 */
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#ifdef EARLY_UART
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#include <asm/arch/grf_rk3188.h>
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/* Enable early UART on the RK3188 */
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#define GRF_BASE 0x20008000
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struct rk3188_grf * const grf = (void *)GRF_BASE;
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rk_clrsetreg(&grf->gpio1b_iomux,
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GPIO1B1_MASK << GPIO1B1_SHIFT |
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GPIO1B0_MASK << GPIO1B0_SHIFT,
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GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
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GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
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/*
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* Debug UART can be used from here if required:
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*
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* debug_uart_init();
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* printch('a');
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* printhex8(0x1234);
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* printascii("string");
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*/
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debug_uart_init();
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printch('t');
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printch('p');
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printch('l');
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printch('-');
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printch(rk3188_num_entries + 1 + '0');
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printch('\n');
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#endif
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rk3188_num_entries++;
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if (rk3188_num_entries == 1) {
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/*
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* The original loader did some very basic integrity
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* checking at this point, but the remaining few bytes
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* could be used for any improvement making sense
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* really early on.
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*/
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back_to_bootrom();
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} else {
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/*
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* TPL part of the loader should now wait for us
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* at offset 0xC00 in the sram. Should never return
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* from there.
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*/
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jump_to_spl();
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}
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}
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