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According to table 2-3 on page 87 of Marvell's latest PXA270 Specification Update Rev. I from 2010.04.19 [1] there exists a breed of chips with a new CPU ID for PXA270M A1 stepping which our latest Colibri PXA270 V2.4A modules actually have assembled. This patch helps in correctly identifying those chips upon boot as well which then looks as follows: CPU: Marvell PXA27xM rev. A1 [1] http://www.marvell.com/application-processors/pxa-family/assets/pxa_27x_spec_update.pdf Acked-by: Marek Vasut <marex@denx.de>
145 lines
2.7 KiB
C
145 lines
2.7 KiB
C
/*
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* PXA CPU information display
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*
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* Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <errno.h>
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#include <linux/compiler.h>
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#ifdef CONFIG_CPU_PXA25X
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#if ((CONFIG_SYS_INIT_SP_ADDR) != 0xfffff800)
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#error "Init SP address must be set to 0xfffff800 for PXA250"
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#endif
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#endif
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#define CPU_MASK_PXA_PRODID 0x000003f0
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#define CPU_MASK_PXA_REVID 0x0000000f
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#define CPU_MASK_PRODREV (CPU_MASK_PXA_PRODID | CPU_MASK_PXA_REVID)
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#define CPU_VALUE_PXA25X 0x100
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#define CPU_VALUE_PXA27X 0x110
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static uint32_t pxa_get_cpuid(void)
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{
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uint32_t cpuid;
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asm volatile("mrc p15, 0, %0, c0, c0, 0" : "=r"(cpuid));
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return cpuid;
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}
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int cpu_is_pxa25x(void)
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{
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uint32_t id = pxa_get_cpuid();
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id &= CPU_MASK_PXA_PRODID;
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return id == CPU_VALUE_PXA25X;
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}
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int cpu_is_pxa27x(void)
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{
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uint32_t id = pxa_get_cpuid();
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id &= CPU_MASK_PXA_PRODID;
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return id == CPU_VALUE_PXA27X;
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}
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int cpu_is_pxa27xm(void)
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{
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uint32_t id = pxa_get_cpuid();
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return ((id & CPU_MASK_PXA_PRODID) == CPU_VALUE_PXA27X) &&
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((id & CPU_MASK_PXA_REVID) == 8);
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}
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uint32_t pxa_get_cpu_revision(void)
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{
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return pxa_get_cpuid() & CPU_MASK_PRODREV;
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}
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#ifdef CONFIG_DISPLAY_CPUINFO
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static const char *pxa25x_get_revision(void)
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{
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static __maybe_unused const char * const revs_25x[] = { "A0" };
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static __maybe_unused const char * const revs_26x[] = {
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"A0", "B0", "B1"
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};
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static const char *unknown = "Unknown";
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uint32_t id;
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if (!cpu_is_pxa25x())
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return unknown;
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id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
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/* PXA26x is a sick special case as it can't be told apart from PXA25x :-( */
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#ifdef CONFIG_CPU_PXA26X
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switch (id) {
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case 3: return revs_26x[0];
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case 5: return revs_26x[1];
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case 6: return revs_26x[2];
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}
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#else
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if (id == 6)
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return revs_25x[0];
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#endif
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return unknown;
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}
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static const char *pxa27x_get_revision(void)
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{
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static const char *const rev[] = { "A0", "A1", "B0", "B1", "C0", "C5" };
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static const char *unknown = "Unknown";
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uint32_t id;
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if (!cpu_is_pxa27x())
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return unknown;
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id = pxa_get_cpuid() & CPU_MASK_PXA_REVID;
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if ((id == 5) || (id == 6) || (id > 8))
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return unknown;
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/* Cap the special PXA270 C5 case. */
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if (id == 7)
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id = 5;
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/* Cap the special PXA270M A1 case. */
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if (id == 8)
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id = 1;
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return rev[id];
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}
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static int print_cpuinfo_pxa2xx(void)
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{
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if (cpu_is_pxa25x()) {
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puts("Marvell PXA25x rev. ");
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puts(pxa25x_get_revision());
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} else if (cpu_is_pxa27x()) {
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puts("Marvell PXA27x");
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if (cpu_is_pxa27xm()) puts("M");
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puts(" rev. ");
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puts(pxa27x_get_revision());
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} else
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return -EINVAL;
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puts("\n");
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return 0;
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}
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int print_cpuinfo(void)
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{
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int ret;
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puts("CPU: ");
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ret = print_cpuinfo_pxa2xx();
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if (!ret)
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return ret;
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return ret;
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}
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#endif
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