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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2018 Synopsys, Inc. All rights reserved.
*/
#include <common.h>
#include <cpu_func.h>
#include <init.h>
#include <malloc.h>
#include <dwmmc.h>
#include <linux/libfdt.h>
#include <fdtdec.h>
#include <asm/arcregs.h>
DECLARE_GLOBAL_DATA_PTR;
#define SYSCON_BASE 0xf000a000
#define AHBCKDIV (void *)(SYSCON_BASE + 0x04)
#define APBCKDIV (void *)(SYSCON_BASE + 0x08)
#define APBCKEN (void *)(SYSCON_BASE + 0x0C)
#define RESET_REG (void *)(SYSCON_BASE + 0x18)
#define CLKSEL (void *)(SYSCON_BASE + 0x24)
#define CLKSTAT (void *)(SYSCON_BASE + 0x28)
#define PLLCON (void *)(SYSCON_BASE + 0x2C)
#define APBCKSEL (void *)(SYSCON_BASE + 0x30)
#define AHBCKEN (void *)(SYSCON_BASE + 0x34)
#define USBPHY_PLL (void *)(SYSCON_BASE + 0x78)
#define USBCFG (void *)(SYSCON_BASE + 0x7c)
#define PLL_MASK_0 0xffcfffff
#define PLL_MASK_1 0xffcfff00
#define PLL_MASK_2 0xfbcfff00
#define CLKSEL_DEFAULT 0x5a690000
static int set_cpu_freq(unsigned int clk)
{
clk /= 1000000;
/* Set clk to ext Xtal (LSN value 0) */
writel(CLKSEL_DEFAULT, CLKSEL);
switch (clk) {
case 16:
/* Bypass mode */
return 0;
case 50:
writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
/* pll_off=1, M=25, N=1, OD=3, PLL_OUT_CLK=50M */
writel((readl(PLLCON) & PLL_MASK_1) | 0x300191, PLLCON);
/* pll_off=0, M=25, N=1, OD=3, PLL_OUT_CLK=50M */
writel((readl(PLLCON) & PLL_MASK_2) | 0x300191, PLLCON);
break;
case 72:
writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
/* pll_off=1, M=18, N=1, OD=2, PLL_OUT_CLK=72M */
writel((readl(PLLCON) & PLL_MASK_1) | 0x200121, PLLCON);
/* pll_off=0, M=18, N=1, OD=2, PLL_OUT_CLK=72M */
writel((readl(PLLCON) & PLL_MASK_2) | 0x200121, PLLCON);
break;
case 100:
writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
/* pll_off=1,M=25, N=1, OD=2, PLL_OUT_CLK=100M */
writel((readl(PLLCON) & PLL_MASK_1) | 0x200191, PLLCON);
/* pll_off=0,M=25, N=1, OD=2, PLL_OUT_CLK=100M */
writel((readl(PLLCON) & PLL_MASK_2) | 0x200191, PLLCON);
break;
case 136:
writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
/* pll_off=1, M=17, N=1, OD=1, PLL_OUT_CLK=136M */
writel((readl(PLLCON) & PLL_MASK_1) | 0x100111, PLLCON);
/* pll_off=0, M=17, N=1, OD=1, PLL_OUT_CLK=136M */
writel((readl(PLLCON) & PLL_MASK_2) | 0x100111, PLLCON);
break;
case 144:
writel(readl(PLLCON) & PLL_MASK_0, PLLCON);
/* pll_off=1, M=18, N=1, OD=1, PLL_OUT_CLK=144M */
writel((readl(PLLCON) & PLL_MASK_1) | 0x100121, PLLCON);
/* pll_off=0, M=18, N=1, OD=1, PLL_OUT_CLK=144M */
writel((readl(PLLCON) & PLL_MASK_2) | 0x100121, PLLCON);
break;
default:
return -EINVAL;
}
while (!(readl(CLKSTAT) & 0x4))
;
/* Set clk from PLL on bus (LSN = 1) */
writel(CLKSEL_DEFAULT | BIT(0), CLKSEL);
return 0;
}
extern u8 __rom_end[];
extern u8 __ram_start[];
extern u8 __ram_end[];
/*
* Use mach_cpu_init() for .data section copy as board_early_init_f() will be
* too late: initf_dm() will use a value of "av_" variable from not yet
* initialized (by copy) area.
*/
int mach_cpu_init(void)
{
int offset;
/* Don't relocate U-Boot */
gd->flags |= GD_FLG_SKIP_RELOC;
/* Copy data from ROM to RAM */
u8 *src = __rom_end;
u8 *dst = __ram_start;
while (dst < __ram_end)
*dst++ = *src++;
/* Enable debug uart */
#define DEBUG_UART_BASE 0x80014000
#define DEBUG_UART_DLF_OFFSET 0xc0
write_aux_reg(DEBUG_UART_BASE + DEBUG_UART_DLF_OFFSET, 1);
offset = fdt_path_offset(gd->fdt_blob, "/cpu_card/core_clk");
if (offset < 0)
return offset;
gd->cpu_clk = fdtdec_get_int(gd->fdt_blob, offset, "clock-frequency", 0);
if (!gd->cpu_clk)
return -EINVAL;
/* If CPU freq > 100 MHz, divide eFLASH clock by 2 */
if (gd->cpu_clk > 100000000) {
u32 reg = readl(AHBCKDIV);
reg &= ~(0xF << 8);
reg |= 2 << 8;
writel(reg, AHBCKDIV);
}
return set_cpu_freq(gd->cpu_clk);
}
#define IOTDK_RESET_SEQ 0x55AA6699
void reset_cpu(ulong addr)
{
writel(IOTDK_RESET_SEQ, RESET_REG);
}
int checkboard(void)
{
puts("Board: Synopsys IoT Development Kit\n");
return 0;
};
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