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u-boot/arch/arm/cpu/pxa/pxa2xx.c
Harald Seiler 35b65dd8ef reset: Remove addr parameter from reset_cpu() 
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>
2021-03-02 14:03:02 -05:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Marius Groeger <mgroeger@sysgo.de>
*
* (C) Copyright 2002
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Alex Zuepke <azu@sysgo.de>
*/
#include <common.h>
#include <cpu_func.h>
#include <init.h>
#include <irq_func.h>
#include <asm/arch/pxa-regs.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <asm/system.h>
#include <command.h>
/* Flush I/D-cache */
static void cache_flush(void)
{
unsigned long i = 0;
asm ("mcr p15, 0, %0, c7, c5, 0" : : "r" (i));
}
int cleanup_before_linux(void)
{
/*
* This function is called just before we call Linux. It prepares
* the processor for Linux by just disabling everything that can
* disturb booting Linux.
*/
disable_interrupts();
icache_disable();
dcache_disable();
cache_flush();
return 0;
}
inline void writelrb(uint32_t val, uint32_t addr)
{
writel(val, addr);
asm volatile("" : : : "memory");
readl(addr);
asm volatile("" : : : "memory");
}
void pxa2xx_dram_init(void)
{
uint32_t tmp;
int i;
/*
* 1) Initialize Asynchronous static memory controller
*/
writelrb(CONFIG_SYS_MSC0_VAL, MSC0);
writelrb(CONFIG_SYS_MSC1_VAL, MSC1);
writelrb(CONFIG_SYS_MSC2_VAL, MSC2);
/*
* 2) Initialize Card Interface
*/
/* MECR: Memory Expansion Card Register */
writelrb(CONFIG_SYS_MECR_VAL, MECR);
/* MCMEM0: Card Interface slot 0 timing */
writelrb(CONFIG_SYS_MCMEM0_VAL, MCMEM0);
/* MCMEM1: Card Interface slot 1 timing */
writelrb(CONFIG_SYS_MCMEM1_VAL, MCMEM1);
/* MCATT0: Card Interface Attribute Space Timing, slot 0 */
writelrb(CONFIG_SYS_MCATT0_VAL, MCATT0);
/* MCATT1: Card Interface Attribute Space Timing, slot 1 */
writelrb(CONFIG_SYS_MCATT1_VAL, MCATT1);
/* MCIO0: Card Interface I/O Space Timing, slot 0 */
writelrb(CONFIG_SYS_MCIO0_VAL, MCIO0);
/* MCIO1: Card Interface I/O Space Timing, slot 1 */
writelrb(CONFIG_SYS_MCIO1_VAL, MCIO1);
/*
* 3) Configure Fly-By DMA register
*/
writelrb(CONFIG_SYS_FLYCNFG_VAL, FLYCNFG);
/*
* 4) Initialize Timing for Sync Memory (SDCLK0)
*/
/*
* Before accessing MDREFR we need a valid DRI field, so we set
* this to power on defaults + DRI field.
*/
/* Read current MDREFR config and zero out DRI */
tmp = readl(MDREFR) & ~0xfff;
/* Add user-specified DRI */
tmp |= CONFIG_SYS_MDREFR_VAL & 0xfff;
/* Configure important bits */
tmp |= MDREFR_K0RUN | MDREFR_SLFRSH;
tmp &= ~(MDREFR_APD | MDREFR_E1PIN);
/* Write MDREFR back */
writelrb(tmp, MDREFR);
/*
* 5) Initialize Synchronous Static Memory (Flash/Peripherals)
*/
/* Initialize SXCNFG register. Assert the enable bits.
*
* Write SXMRS to cause an MRS command to all enabled banks of
* synchronous static memory. Note that SXLCR need not be written
* at this time.
*/
writelrb(CONFIG_SYS_SXCNFG_VAL, SXCNFG);
/*
* 6) Initialize SDRAM
*/
writelrb(CONFIG_SYS_MDREFR_VAL & ~MDREFR_SLFRSH, MDREFR);
writelrb(CONFIG_SYS_MDREFR_VAL | MDREFR_E1PIN, MDREFR);
/*
* 7) Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure
* but not enable each SDRAM partition pair.
*/
writelrb(CONFIG_SYS_MDCNFG_VAL &
~(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3), MDCNFG);
/* Wait for the clock to the SDRAMs to stabilize, 100..200 usec. */
writel(0, OSCR);
while (readl(OSCR) < 0x300)
asm volatile("" : : : "memory");
/*
* 8) Trigger a number (usually 8) refresh cycles by attempting
* non-burst read or write accesses to disabled SDRAM, as commonly
* specified in the power up sequence documented in SDRAM data
* sheets. The address(es) used for this purpose must not be
* cacheable.
*/
for (i = 9; i >= 0; i--) {
writel(i, 0xa0000000);
asm volatile("" : : : "memory");
}
/*
* 9) Write MDCNFG with enable bits asserted (MDCNFG:DEx set to 1).
*/
tmp = CONFIG_SYS_MDCNFG_VAL &
(MDCNFG_DE0 | MDCNFG_DE1 | MDCNFG_DE2 | MDCNFG_DE3);
tmp |= readl(MDCNFG);
writelrb(tmp, MDCNFG);
/*
* 10) Write MDMRS.
*/
writelrb(CONFIG_SYS_MDMRS_VAL, MDMRS);
/*
* 11) Enable APD
*/
if (CONFIG_SYS_MDREFR_VAL & MDREFR_APD) {
tmp = readl(MDREFR);
tmp |= MDREFR_APD;
writelrb(tmp, MDREFR);
}
}
void pxa_gpio_setup(void)
{
writel(CONFIG_SYS_GPSR0_VAL, GPSR0);
writel(CONFIG_SYS_GPSR1_VAL, GPSR1);
writel(CONFIG_SYS_GPSR2_VAL, GPSR2);
#if defined(CONFIG_CPU_PXA27X)
writel(CONFIG_SYS_GPSR3_VAL, GPSR3);
#endif
writel(CONFIG_SYS_GPCR0_VAL, GPCR0);
writel(CONFIG_SYS_GPCR1_VAL, GPCR1);
writel(CONFIG_SYS_GPCR2_VAL, GPCR2);
#if defined(CONFIG_CPU_PXA27X)
writel(CONFIG_SYS_GPCR3_VAL, GPCR3);
#endif
writel(CONFIG_SYS_GPDR0_VAL, GPDR0);
writel(CONFIG_SYS_GPDR1_VAL, GPDR1);
writel(CONFIG_SYS_GPDR2_VAL, GPDR2);
#if defined(CONFIG_CPU_PXA27X)
writel(CONFIG_SYS_GPDR3_VAL, GPDR3);
#endif
writel(CONFIG_SYS_GAFR0_L_VAL, GAFR0_L);
writel(CONFIG_SYS_GAFR0_U_VAL, GAFR0_U);
writel(CONFIG_SYS_GAFR1_L_VAL, GAFR1_L);
writel(CONFIG_SYS_GAFR1_U_VAL, GAFR1_U);
writel(CONFIG_SYS_GAFR2_L_VAL, GAFR2_L);
writel(CONFIG_SYS_GAFR2_U_VAL, GAFR2_U);
#if defined(CONFIG_CPU_PXA27X)
writel(CONFIG_SYS_GAFR3_L_VAL, GAFR3_L);
writel(CONFIG_SYS_GAFR3_U_VAL, GAFR3_U);
#endif
writel(CONFIG_SYS_PSSR_VAL, PSSR);
}
void pxa_interrupt_setup(void)
{
writel(0, ICLR);
writel(0, ICMR);
#if defined(CONFIG_CPU_PXA27X)
writel(0, ICLR2);
writel(0, ICMR2);
#endif
}
void pxa_clock_setup(void)
{
writel(CONFIG_SYS_CKEN, CKEN);
writel(CONFIG_SYS_CCCR, CCCR);
asm volatile("mcr p14, 0, %0, c6, c0, 0" : : "r"(0x0b));
/* enable the 32Khz oscillator for RTC and PowerManager */
writel(OSCC_OON, OSCC);
while (!(readl(OSCC) & OSCC_OOK))
asm volatile("" : : : "memory");
}
void pxa_wakeup(void)
{
uint32_t rcsr;
rcsr = readl(RCSR);
writel(rcsr & (RCSR_GPR | RCSR_SMR | RCSR_WDR | RCSR_HWR), RCSR);
/* Wakeup */
if (rcsr & RCSR_SMR) {
writel(PSSR_PH, PSSR);
pxa2xx_dram_init();
icache_disable();
dcache_disable();
asm volatile("mov pc, %0" : : "r"(readl(PSPR)));
}
}
int arch_cpu_init(void)
{
pxa_gpio_setup();
pxa_wakeup();
pxa_interrupt_setup();
pxa_clock_setup();
return 0;
}
void i2c_clk_enable(void)
{
/* Set the global I2C clock on */
writel(readl(CKEN) | CKEN14_I2C, CKEN);
}
void __attribute__((weak)) reset_cpu(void) __attribute__((noreturn));
void reset_cpu(void)
{
uint32_t tmp;
setbits_le32(OWER, OWER_WME);
tmp = readl(OSCR);
tmp += 0x1000;
writel(tmp, OSMR3);
writel(MDREFR_SLFRSH, MDREFR);
for (;;)
;
}
void enable_caches(void)
{
#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
icache_enable();
#endif
#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
dcache_enable();
#endif
}
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