mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-17 16:53:06 +00:00
35b65dd8ef
Historically, the reset_cpu() function had an `addr` parameter which was
meant to pass in an address of the reset vector location, where the CPU
should reset to. This feature is no longer used anywhere in U-Boot as
all reset_cpu() implementations now ignore the passed value. Generic
code has been added which always calls reset_cpu() with `0` which means
this feature can no longer be used easily anyway.
Over time, many implementations seem to have "misunderstood" the
existence of this parameter as a way to customize/parameterize the reset
(e.g. COLD vs WARM resets). As this is not properly supported, the
code will almost always not do what it is intended to (because all
call-sites just call reset_cpu() with 0).
To avoid confusion and to clean up the codebase from unused left-overs
of the past, remove the `addr` parameter entirely. Code which intends
to support different kinds of resets should be rewritten as a sysreset
driver instead.
This transformation was done with the following coccinelle patch:
@@
expression argvalue;
@@
- reset_cpu(argvalue)
+ reset_cpu()
@@
identifier argname;
type argtype;
@@
- reset_cpu(argtype argname)
+ reset_cpu(void)
{ ... }
Signed-off-by: Harald Seiler <hws@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
163 lines
4 KiB
C
163 lines
4 KiB
C
// 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 <asm/global_data.h>
|
|
#include <linux/bitops.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(void)
|
|
{
|
|
writel(IOTDK_RESET_SEQ, RESET_REG);
|
|
}
|
|
|
|
int checkboard(void)
|
|
{
|
|
puts("Board: Synopsys IoT Development Kit\n");
|
|
return 0;
|
|
};
|