u-boot/arch/arm/mach-kirkwood/cpu.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009
* Marvell Semiconductor <www.marvell.com>
* Written-by: Prafulla Wadaskar <prafulla@marvell.com>
*/
#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <env.h>
#include <init.h>
#include <log.h>
#include <net.h>
#include <netdev.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <asm/arch/cpu.h>
#include <asm/arch/soc.h>
#include <mvebu_mmc.h>
void reset_cpu(void)
{
struct kwcpu_registers *cpureg =
(struct kwcpu_registers *)KW_CPU_REG_BASE;
writel(readl(&cpureg->rstoutn_mask) | (1 << 2),
&cpureg->rstoutn_mask);
writel(readl(&cpureg->sys_soft_rst) | 1,
&cpureg->sys_soft_rst);
while (1) ;
}
/*
* Window Size
* Used with the Base register to set the address window size and location.
* Must be programmed from LSB to MSB as sequence of ones followed by
* sequence of zeros. The number of ones specifies the size of the window in
* 64 KByte granularity (e.g., a value of 0x00FF specifies 256 = 16 MByte).
* NOTE: A value of 0x0 specifies 64-KByte size.
*/
unsigned int kw_winctrl_calcsize(unsigned int sizeval)
{
int i;
unsigned int j = 0;
u32 val = sizeval >> 1;
for (i = 0; val >= 0x10000; i++) {
j |= (1 << i);
val = val >> 1;
}
return (0x0000ffff & j);
}
static const struct mbus_win windows[] = {
/* Window 0: PCIE MEM address space */
{ KW_DEFADR_PCI_MEM, KW_DEFADR_PCI_MEM_SIZE,
KWCPU_TARGET_PCIE, KWCPU_ATTR_PCIE_MEM },
/* Window 1: PCIE IO address space */
{ KW_DEFADR_PCI_IO, KW_DEFADR_PCI_IO_SIZE,
KWCPU_TARGET_PCIE, KWCPU_ATTR_PCIE_IO },
/* Window 2: NAND Flash address space */
{ KW_DEFADR_NANDF, 1024 * 1024 * 128,
KWCPU_TARGET_MEMORY, KWCPU_ATTR_NANDFLASH },
/* Window 3: SPI Flash address space */
{ KW_DEFADR_SPIF, 1024 * 1024 * 128,
KWCPU_TARGET_MEMORY, KWCPU_ATTR_SPIFLASH },
/* Window 4: BOOT Memory address space */
{ KW_DEFADR_BOOTROM, 1024 * 1024 * 128,
KWCPU_TARGET_MEMORY, KWCPU_ATTR_BOOTROM },
/* Window 5: Security SRAM address space */
{ KW_DEFADR_SASRAM, 1024 * 64,
KWCPU_TARGET_SASRAM, KWCPU_ATTR_SASRAM },
};
/*
* SYSRSTn Duration Counter Support
*
* Kirkwood SoC implements a hardware-based SYSRSTn duration counter.
* When SYSRSTn is asserted low, a SYSRSTn duration counter is running.
* The SYSRSTn duration counter is useful for implementing a manufacturer
* or factory reset. Upon a long reset assertion that is greater than a
* pre-configured environment variable value for sysrstdelay,
* The counter value is stored in the SYSRSTn Length Counter Register
* The counter is based on the 25-MHz reference clock (40ns)
* It is a 29-bit counter, yielding a maximum counting duration of
* 2^29/25 MHz (21.4 seconds). When the counter reach its maximum value,
* it remains at this value until counter reset is triggered by setting
* bit 31 of KW_REG_SYSRST_CNT
*/
static void kw_sysrst_action(void)
{
int ret;
char *s = env_get("sysrstcmd");
if (!s) {
debug("Error.. %s failed, check sysrstcmd\n",
__FUNCTION__);
return;
}
debug("Starting %s process...\n", __FUNCTION__);
ret = run_command(s, 0);
if (ret != 0)
debug("Error.. %s failed\n", __FUNCTION__);
else
debug("%s process finished\n", __FUNCTION__);
}
static void kw_sysrst_check(void)
{
u32 sysrst_cnt, sysrst_dly;
char *s;
/*
* no action if sysrstdelay environment variable is not defined
*/
s = env_get("sysrstdelay");
if (s == NULL)
return;
/* read sysrstdelay value */
sysrst_dly = (u32)dectoul(s, NULL);
/* read SysRst Length counter register (bits 28:0) */
sysrst_cnt = (0x1fffffff & readl(KW_REG_SYSRST_CNT));
debug("H/w Rst hold time: %d.%d secs\n",
sysrst_cnt / SYSRST_CNT_1SEC_VAL,
sysrst_cnt % SYSRST_CNT_1SEC_VAL);
/* clear the counter for next valid read*/
writel(1 << 31, KW_REG_SYSRST_CNT);
/*
* sysrst_action:
* if H/w Reset key is pressed and hold for time
* more than sysrst_dly in seconds
*/
if (sysrst_cnt >= SYSRST_CNT_1SEC_VAL * sysrst_dly)
kw_sysrst_action();
}
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo(void)
{
char *rev = "??";
u16 devid = (readl(KW_REG_PCIE_DEVID) >> 16) & 0xffff;
u8 revid = readl(KW_REG_PCIE_REVID) & 0xff;
if ((readl(KW_REG_DEVICE_ID) & 0x03) > 2) {
printf("Error.. %s:Unsupported Kirkwood SoC 88F%04x\n", __FUNCTION__, devid);
return -1;
}
switch (revid) {
case 0:
if (devid == 0x6281)
rev = "Z0";
else if (devid == 0x6282)
rev = "A0";
break;
case 1:
rev = "A1";
break;
case 2:
rev = "A0";
break;
case 3:
rev = "A1";
break;
default:
break;
}
printf("SoC: Kirkwood 88F%04x_%s\n", devid, rev);
return 0;
}
#endif /* CONFIG_DISPLAY_CPUINFO */
#ifdef CONFIG_ARCH_CPU_INIT
int arch_cpu_init(void)
{
u32 reg;
struct kwcpu_registers *cpureg =
(struct kwcpu_registers *)KW_CPU_REG_BASE;
/* Linux expects the internal registers to be at 0xf1000000 */
writel(KW_REGS_PHY_BASE, KW_OFFSET_REG);
/* Enable and invalidate L2 cache in write through mode */
writel(readl(&cpureg->l2_cfg) | 0x18, &cpureg->l2_cfg);
invalidate_l2_cache();
#ifdef CONFIG_KIRKWOOD_RGMII_PAD_1V8
/*
* Configures the I/O voltage of the pads connected to Egigabit
* Ethernet interface to 1.8V
* By default it is set to 3.3V
*/
reg = readl(KW_REG_MPP_OUT_DRV_REG);
reg |= (1 << 7);
writel(reg, KW_REG_MPP_OUT_DRV_REG);
#endif
#ifdef CONFIG_KIRKWOOD_EGIGA_INIT
/*
* Set egiga port0/1 in normal functional mode
* This is required becasue on kirkwood by default ports are in reset mode
* OS egiga driver may not have provision to set them in normal mode
* and if u-boot is build without network support, network may fail at OS level
*/
reg = readl(KWGBE_PORT_SERIAL_CONTROL1_REG(0));
reg &= ~(1 << 4); /* Clear PortReset Bit */
writel(reg, (KWGBE_PORT_SERIAL_CONTROL1_REG(0)));
reg = readl(KWGBE_PORT_SERIAL_CONTROL1_REG(1));
reg &= ~(1 << 4); /* Clear PortReset Bit */
writel(reg, (KWGBE_PORT_SERIAL_CONTROL1_REG(1)));
#endif
#ifdef CONFIG_KIRKWOOD_PCIE_INIT
/*
* Enable PCI Express Port0
*/
reg = readl(&cpureg->ctrl_stat);
reg |= (1 << 0); /* Set PEX0En Bit */
writel(reg, &cpureg->ctrl_stat);
#endif
return 0;
}
#endif /* CONFIG_ARCH_CPU_INIT */
/*
* SOC specific misc init
*/
#if defined(CONFIG_ARCH_MISC_INIT)
int arch_misc_init(void)
{
volatile u32 temp;
/*CPU streaming & write allocate */
temp = readfr_extra_feature_reg();
temp &= ~(1 << 28); /* disable wr alloc */
writefr_extra_feature_reg(temp);
temp = readfr_extra_feature_reg();
temp &= ~(1 << 29); /* streaming disabled */
writefr_extra_feature_reg(temp);
/* L2Cache settings */
temp = readfr_extra_feature_reg();
/* Disable L2C pre fetch - Set bit 24 */
temp |= (1 << 24);
/* enable L2C - Set bit 22 */
temp |= (1 << 22);
writefr_extra_feature_reg(temp);
/* Change reset vector to address 0x0 */
temp = get_cr();
set_cr(temp & ~CR_V);
/* Configure mbus windows */
mvebu_mbus_probe(windows, ARRAY_SIZE(windows));
/* checks and execute resset to factory event */
kw_sysrst_check();
return 0;
}
#endif /* CONFIG_ARCH_MISC_INIT */
#ifdef CONFIG_MVGBE
int cpu_eth_init(struct bd_info *bis)
{
mvgbe_initialize(bis);
return 0;
}
#endif