diff options
Diffstat (limited to 'arch/arm/boards/variscite-mx6/lowlevel.c')
-rw-r--r-- | arch/arm/boards/variscite-mx6/lowlevel.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/arm/boards/variscite-mx6/lowlevel.c b/arch/arm/boards/variscite-mx6/lowlevel.c new file mode 100644 index 0000000000..e93e87484c --- /dev/null +++ b/arch/arm/boards/variscite-mx6/lowlevel.c @@ -0,0 +1,74 @@ +/* + * + * Copyright (C) 2013 Michael Burkey + * Based on code by Sascha Hauer <s.hauer@pengutronix.de> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +#include <debug_ll.h> +#include <common.h> +#include <sizes.h> +#include <io.h> +#include <asm/barebox-arm-head.h> +#include <asm/barebox-arm.h> +#include <asm/sections.h> +#include <asm/cache.h> +#include <asm/mmu.h> +#include <mach/imx6-mmdc.h> +#include <mach/imx6.h> + +static inline void setup_uart(void) +{ + void __iomem *ccmbase = (void *)MX6_CCM_BASE_ADDR; + void __iomem *uartbase = (void *)MX6_UART1_BASE_ADDR; + void __iomem *iomuxbase = (void *)MX6_IOMUXC_BASE_ADDR; + + writel(0x03, iomuxbase + 0x0280); + writel(0x03, iomuxbase + 0x0284); + + writel(0xffffffff, ccmbase + 0x68); + writel(0xffffffff, ccmbase + 0x6c); + writel(0xffffffff, ccmbase + 0x70); + writel(0xffffffff, ccmbase + 0x74); + writel(0xffffffff, ccmbase + 0x78); + writel(0xffffffff, ccmbase + 0x7c); + writel(0xffffffff, ccmbase + 0x80); + + writel(0x00000000, uartbase + 0x80); + writel(0x00004027, uartbase + 0x84); + writel(0x00000704, uartbase + 0x88); + writel(0x00000a81, uartbase + 0x90); + writel(0x0000002b, uartbase + 0x9c); + writel(0x00013880, uartbase + 0xb0); + writel(0x0000047f, uartbase + 0xa4); + writel(0x0000c34f, uartbase + 0xa8); + writel(0x00000001, uartbase + 0x80); + + putc_ll('>'); +} +extern char __dtb_imx6q_var_custom_start[]; + +ENTRY_FUNCTION(start_variscite_custom, r0, r1, r2) +{ + uint32_t fdt; + + arm_cpu_lowlevel_init(); + + arm_setup_stack(0x00920000 - 8); + + if (IS_ENABLED(CONFIG_DEBUG_LL)) + setup_uart(); + + fdt = (uint32_t)__dtb_imx6q_var_custom_start - get_runtime_offset(); + + barebox_arm_entry(0x10000000, SZ_1G, fdt); +} |