// SPDX-License-Identifier: GPL-2.0-only
/*
* arch / arm / mach - spear13xx / spear13xx . c
*
* SPEAr13XX machines common source file
*
* Copyright ( C ) 2012 ST Microelectronics
* Viresh Kumar < vireshk @ kernel . org >
*/
#define pr_fmt(fmt) "SPEAr13xx: " fmt
#include <linux/amba/pl022.h>
#include <linux/clk.h>
#include <linux/clk/spear.h>
#include <linux/clocksource.h>
#include <linux/err.h>
#include <linux/of.h>
#include <asm /hardware/cache-l2x0.h>
#include <asm /mach/map.h>
#include "spear.h"
#include "generic.h"
void __init spear13xx_l2x0_init(void )
{
/*
* 512 KB ( 64 KB / way ) , 8 - way associativity , parity supported
*
* FIXME : 9 th bit , of Auxiliary Controller register must be set
* for some spear13xx devices for stable L2 operation .
*
* Enable Early BRESP , L2 prefetch for Instruction and Data ,
* write alloc and ' Full line of zero ' options
*
*/
if (!IS_ENABLED(CONFIG_CACHE_L2X0))
return ;
writel_relaxed(0 x06, VA_L2CC_BASE + L310_PREFETCH_CTRL);
/*
* Program following latencies in order to make
* SPEAr1340 work at 600 MHz
*/
writel_relaxed(0 x221, VA_L2CC_BASE + L310_TAG_LATENCY_CTRL);
writel_relaxed(0 x441, VA_L2CC_BASE + L310_DATA_LATENCY_CTRL);
l2x0_init(VA_L2CC_BASE, 0 x30a00001, 0 xfe0fffff);
}
/*
* Following will create 16 MB static virtual / physical mappings
* PHYSICAL VIRTUAL
* 0 xB3000000 0 xF9000000
* 0 xE0000000 0 xFD000000
* 0 xEC000000 0 xFC000000
* 0 xED000000 0 xFB000000
*/
static struct map_desc spear13xx_io_desc[] __initdata = {
{
.virtual = (unsigned long )VA_PERIP_GRP2_BASE,
.pfn = __phys_to_pfn(PERIP_GRP2_BASE),
.length = SZ_16M,
.type = MT_DEVICE
}, {
.virtual = (unsigned long )VA_PERIP_GRP1_BASE,
.pfn = __phys_to_pfn(PERIP_GRP1_BASE),
.length = SZ_16M,
.type = MT_DEVICE
}, {
.virtual = (unsigned long )VA_A9SM_AND_MPMC_BASE,
.pfn = __phys_to_pfn(A9SM_AND_MPMC_BASE),
.length = SZ_16M,
.type = MT_DEVICE
}, {
.virtual = (unsigned long )VA_L2CC_BASE,
.pfn = __phys_to_pfn(L2CC_BASE),
.length = SZ_4K,
.type = MT_DEVICE
},
};
/* This will create static memory mapping for selected devices */
void __init spear13xx_map_io(void )
{
iotable_init(spear13xx_io_desc, ARRAY_SIZE(spear13xx_io_desc));
}
static void __init spear13xx_clk_init(void )
{
if (of_machine_is_compatible("st,spear1310" ))
spear1310_clk_init(VA_MISC_BASE, VA_SPEAR1310_RAS_BASE);
else if (of_machine_is_compatible("st,spear1340" ))
spear1340_clk_init(VA_MISC_BASE);
else
pr_err("%s: Unknown machine\n" , __func__);
}
void __init spear13xx_timer_init(void )
{
char pclk_name[] = "osc_24m_clk" ;
struct clk *gpt_clk, *pclk;
spear13xx_clk_init();
/* get the system timer clock */
gpt_clk = clk_get_sys("gpt0" , NULL);
if (IS_ERR(gpt_clk)) {
pr_err("%s:couldn't get clk for gpt\n" , __func__);
BUG();
}
/* get the suitable parent clock for timer*/
pclk = clk_get(NULL, pclk_name);
if (IS_ERR(pclk)) {
pr_err("%s:couldn't get %s as parent for gpt\n" , __func__,
pclk_name);
BUG();
}
clk_set_parent(gpt_clk, pclk);
clk_put(gpt_clk);
clk_put(pclk);
spear_setup_of_timer();
timer_probe();
}
Messung V0.5 in Prozent C=96 H=96 G=95
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-28)
¤
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