u-boot/arch/arm/cpu/armv7/ls102xa/cpu.c
Fabio Estevam f861f51c46 ls102xa: Fix reset hang
Since commit 623d96e89aca6("imx: wdog: correct wcr register settings")
issuing a 'reset' command causes the system to hang.

Unlike i.MX and Vybrid, the watchdog controller on LS102x is big-endian.

This means that the watchdog on LS1021 has been working by accident as
it does not use the big-endian accessors in drivers/watchdog/imx_watchdog.c.
Commit 623d96e89aca6("imx: wdog: correct wcr register settings") only
revelead the endianness problem on LS102x.

In order to fix the reset hang, introduce a reset_cpu() implementation that
is specific for ls102x, which accesses the watchdog WCR register in big-endian
format. All that is required to reset LS102x is to clear the SRS bit.

This approach is a temporary workaround to avoid a regression for LS102x
in the 2015.10 release. The proper fix is to make the watchdog driver
endian-aware, so that it can work for i.MX, Vybrid and LS102x.

Reported-by: Sinan Akman <sinan@writeme.com>
Tested-by: Sinan Akman <sinan@writeme.com>
Reviewed-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
2015-10-12 12:56:32 -04:00

371 lines
9.2 KiB
C

/*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/clock.h>
#include <asm/io.h>
#include <asm/arch/immap_ls102xa.h>
#include <asm/cache.h>
#include <asm/system.h>
#include <tsec.h>
#include <netdev.h>
#include <fsl_esdhc.h>
#include <config.h>
#include <fsl_wdog.h>
#include "fsl_epu.h"
#define DCSR_RCPM2_BLOCK_OFFSET 0x223000
#define DCSR_RCPM2_CPMFSMCR0 0x400
#define DCSR_RCPM2_CPMFSMSR0 0x404
#define DCSR_RCPM2_CPMFSMCR1 0x414
#define DCSR_RCPM2_CPMFSMSR1 0x418
#define CPMFSMSR_FSM_STATE_MASK 0x7f
DECLARE_GLOBAL_DATA_PTR;
#ifndef CONFIG_SYS_DCACHE_OFF
/*
* Bit[1] of the descriptor indicates the descriptor type,
* and bit[0] indicates whether the descriptor is valid.
*/
#define PMD_TYPE_TABLE 0x3
#define PMD_TYPE_SECT 0x1
/* AttrIndx[2:0] */
#define PMD_ATTRINDX(t) ((t) << 2)
/* Section */
#define PMD_SECT_AF (1 << 10)
#define BLOCK_SIZE_L1 (1UL << 30)
#define BLOCK_SIZE_L2 (1UL << 21)
/* TTBCR flags */
#define TTBCR_EAE (1 << 31)
#define TTBCR_T0SZ(x) ((x) << 0)
#define TTBCR_T1SZ(x) ((x) << 16)
#define TTBCR_USING_TTBR0 (TTBCR_T0SZ(0) | TTBCR_T1SZ(0))
#define TTBCR_IRGN0_NC (0 << 8)
#define TTBCR_IRGN0_WBWA (1 << 8)
#define TTBCR_IRGN0_WT (2 << 8)
#define TTBCR_IRGN0_WBNWA (3 << 8)
#define TTBCR_IRGN0_MASK (3 << 8)
#define TTBCR_ORGN0_NC (0 << 10)
#define TTBCR_ORGN0_WBWA (1 << 10)
#define TTBCR_ORGN0_WT (2 << 10)
#define TTBCR_ORGN0_WBNWA (3 << 10)
#define TTBCR_ORGN0_MASK (3 << 10)
#define TTBCR_SHARED_NON (0 << 12)
#define TTBCR_SHARED_OUTER (2 << 12)
#define TTBCR_SHARED_INNER (3 << 12)
#define TTBCR_EPD0 (0 << 7)
#define TTBCR (TTBCR_SHARED_NON | \
TTBCR_ORGN0_NC | \
TTBCR_IRGN0_NC | \
TTBCR_USING_TTBR0 | \
TTBCR_EAE)
/*
* Memory region attributes for LPAE (defined in pgtable):
*
* n = AttrIndx[2:0]
*
* n MAIR
* UNCACHED 000 00000000
* BUFFERABLE 001 01000100
* DEV_WC 001 01000100
* WRITETHROUGH 010 10101010
* WRITEBACK 011 11101110
* DEV_CACHED 011 11101110
* DEV_SHARED 100 00000100
* DEV_NONSHARED 100 00000100
* unused 101
* unused 110
* WRITEALLOC 111 11111111
*/
#define MT_MAIR0 0xeeaa4400
#define MT_MAIR1 0xff000004
#define MT_STRONLY_ORDER 0
#define MT_NORMAL_NC 1
#define MT_DEVICE_MEM 4
#define MT_NORMAL 7
/* The phy_addr must be aligned to 4KB */
static inline void set_pgtable(u32 *page_table, u32 index, u32 phy_addr)
{
u32 value = phy_addr | PMD_TYPE_TABLE;
page_table[2 * index] = value;
page_table[2 * index + 1] = 0;
}
/* The phy_addr must be aligned to 4KB */
static inline void set_pgsection(u32 *page_table, u32 index, u64 phy_addr,
u32 memory_type)
{
u64 value;
value = phy_addr | PMD_TYPE_SECT | PMD_SECT_AF;
value |= PMD_ATTRINDX(memory_type);
page_table[2 * index] = value & 0xFFFFFFFF;
page_table[2 * index + 1] = (value >> 32) & 0xFFFFFFFF;
}
/*
* Start MMU after DDR is available, we create MMU table in DRAM.
* The base address of TTLB is gd->arch.tlb_addr. We use two
* levels of translation tables here to cover 40-bit address space.
*
* The TTLBs are located at PHY 2G~4G.
*
* VA mapping:
*
* ------- <---- 0GB
* | |
* | |
* |-------| <---- 0x24000000
* |///////| ===> 192MB VA map for PCIe1 with offset 0x40_0000_0000
* |-------| <---- 0x300000000
* | |
* |-------| <---- 0x34000000
* |///////| ===> 192MB VA map for PCIe2 with offset 0x48_0000_0000
* |-------| <---- 0x40000000
* | |
* |-------| <---- 0x80000000 DDR0 space start
* |\\\\\\\|
*.|\\\\\\\| ===> 2GB VA map for 2GB DDR0 Memory space
* |\\\\\\\|
* ------- <---- 4GB DDR0 space end
*/
static void mmu_setup(void)
{
u32 *level0_table = (u32 *)gd->arch.tlb_addr;
u32 *level1_table = (u32 *)(gd->arch.tlb_addr + 0x1000);
u64 va_start = 0;
u32 reg;
int i;
/* Level 0 Table 2-3 are used to map DDR */
set_pgsection(level0_table, 3, 3 * BLOCK_SIZE_L1, MT_NORMAL);
set_pgsection(level0_table, 2, 2 * BLOCK_SIZE_L1, MT_NORMAL);
/* Level 0 Table 1 is used to map device */
set_pgsection(level0_table, 1, 1 * BLOCK_SIZE_L1, MT_DEVICE_MEM);
/* Level 0 Table 0 is used to map device including PCIe MEM */
set_pgtable(level0_table, 0, (u32)level1_table);
/* Level 1 has 512 entries */
for (i = 0; i < 512; i++) {
/* Mapping for PCIe 1 */
if (va_start >= CONFIG_SYS_PCIE1_VIRT_ADDR &&
va_start < (CONFIG_SYS_PCIE1_VIRT_ADDR +
CONFIG_SYS_PCIE_MMAP_SIZE))
set_pgsection(level1_table, i,
CONFIG_SYS_PCIE1_PHYS_BASE + va_start,
MT_DEVICE_MEM);
/* Mapping for PCIe 2 */
else if (va_start >= CONFIG_SYS_PCIE2_VIRT_ADDR &&
va_start < (CONFIG_SYS_PCIE2_VIRT_ADDR +
CONFIG_SYS_PCIE_MMAP_SIZE))
set_pgsection(level1_table, i,
CONFIG_SYS_PCIE2_PHYS_BASE + va_start,
MT_DEVICE_MEM);
else
set_pgsection(level1_table, i,
va_start,
MT_DEVICE_MEM);
va_start += BLOCK_SIZE_L2;
}
asm volatile("dsb sy;isb");
asm volatile("mcr p15, 0, %0, c2, c0, 2" /* Write RT to TTBCR */
: : "r" (TTBCR) : "memory");
asm volatile("mcrr p15, 0, %0, %1, c2" /* TTBR 0 */
: : "r" ((u32)level0_table), "r" (0) : "memory");
asm volatile("mcr p15, 0, %0, c10, c2, 0" /* write MAIR 0 */
: : "r" (MT_MAIR0) : "memory");
asm volatile("mcr p15, 0, %0, c10, c2, 1" /* write MAIR 1 */
: : "r" (MT_MAIR1) : "memory");
/* Set the access control to all-supervisor */
asm volatile("mcr p15, 0, %0, c3, c0, 0"
: : "r" (~0));
/* Enable the mmu */
reg = get_cr();
set_cr(reg | CR_M);
}
/*
* This function is called from lib/board.c. It recreates MMU
* table in main memory. MMU and i/d-cache are enabled here.
*/
void enable_caches(void)
{
/* Invalidate all TLB */
mmu_page_table_flush(gd->arch.tlb_addr,
gd->arch.tlb_addr + gd->arch.tlb_size);
/* Set up and enable mmu */
mmu_setup();
/* Invalidate & Enable d-cache */
invalidate_dcache_all();
set_cr(get_cr() | CR_C);
}
#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
#if defined(CONFIG_DISPLAY_CPUINFO)
int print_cpuinfo(void)
{
char buf1[32], buf2[32];
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
unsigned int svr, major, minor, ver, i;
svr = in_be32(&gur->svr);
major = SVR_MAJ(svr);
minor = SVR_MIN(svr);
puts("CPU: Freescale LayerScape ");
ver = SVR_SOC_VER(svr);
switch (ver) {
case SOC_VER_SLS1020:
puts("SLS1020");
break;
case SOC_VER_LS1020:
puts("LS1020");
break;
case SOC_VER_LS1021:
puts("LS1021");
break;
case SOC_VER_LS1022:
puts("LS1022");
break;
default:
puts("Unknown");
break;
}
if (IS_E_PROCESSOR(svr) && (ver != SOC_VER_SLS1020))
puts("E");
printf(", Version: %d.%d, (0x%08x)\n", major, minor, svr);
puts("Clock Configuration:");
printf("\n CPU0(ARMV7):%-4s MHz, ", strmhz(buf1, gd->cpu_clk));
printf("\n Bus:%-4s MHz, ", strmhz(buf1, gd->bus_clk));
printf("DDR:%-4s MHz (%s MT/s data rate), ",
strmhz(buf1, gd->mem_clk/2), strmhz(buf2, gd->mem_clk));
puts("\n");
/* Display the RCW, so that no one gets confused as to what RCW
* we're actually using for this boot.
*/
puts("Reset Configuration Word (RCW):");
for (i = 0; i < ARRAY_SIZE(gur->rcwsr); i++) {
u32 rcw = in_be32(&gur->rcwsr[i]);
if ((i % 4) == 0)
printf("\n %08x:", i * 4);
printf(" %08x", rcw);
}
puts("\n");
return 0;
}
#endif
#ifdef CONFIG_FSL_ESDHC
int cpu_mmc_init(bd_t *bis)
{
return fsl_esdhc_mmc_init(bis);
}
#endif
int cpu_eth_init(bd_t *bis)
{
#ifdef CONFIG_TSEC_ENET
tsec_standard_init(bis);
#endif
return 0;
}
int arch_cpu_init(void)
{
void *epu_base = (void *)(CONFIG_SYS_DCSRBAR + EPU_BLOCK_OFFSET);
void *rcpm2_base =
(void *)(CONFIG_SYS_DCSRBAR + DCSR_RCPM2_BLOCK_OFFSET);
u32 state;
/*
* The RCPM FSM state may not be reset after power-on.
* So, reset them.
*/
state = in_be32(rcpm2_base + DCSR_RCPM2_CPMFSMSR0) &
CPMFSMSR_FSM_STATE_MASK;
if (state != 0) {
out_be32(rcpm2_base + DCSR_RCPM2_CPMFSMCR0, 0x80);
out_be32(rcpm2_base + DCSR_RCPM2_CPMFSMCR0, 0x0);
}
state = in_be32(rcpm2_base + DCSR_RCPM2_CPMFSMSR1) &
CPMFSMSR_FSM_STATE_MASK;
if (state != 0) {
out_be32(rcpm2_base + DCSR_RCPM2_CPMFSMCR1, 0x80);
out_be32(rcpm2_base + DCSR_RCPM2_CPMFSMCR1, 0x0);
}
/*
* After wakeup from deep sleep, Clear EPU registers
* as early as possible to prevent from possible issue.
* It's also safe to clear at normal boot.
*/
fsl_epu_clean(epu_base);
return 0;
}
#ifdef CONFIG_ARMV7_NONSEC
/* Set the address at which the secondary core starts from.*/
void smp_set_core_boot_addr(unsigned long addr, int corenr)
{
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
out_be32(&gur->scratchrw[0], addr);
}
/* Release the secondary core from holdoff state and kick it */
void smp_kick_all_cpus(void)
{
struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
out_be32(&gur->brrl, 0x2);
/*
* LS1 STANDBYWFE is not captured outside the ARM module in the soc.
* So add a delay to wait bootrom execute WFE.
*/
udelay(1);
asm volatile("sev");
}
#endif
void reset_cpu(ulong addr)
{
struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
clrbits_be16(&wdog->wcr, WCR_SRS);
while (1) {
/*
* Let the watchdog trigger
*/
}
}