d61fcfe2bb
Instead of hardcoding the amount of available RAM, read the number of effective multiples of 8MB from SDRAM_MBASE_REG. Signed-off-by: Florian Fainelli <florian@openwrt.org> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/3008/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
274 lines
6.4 KiB
C
274 lines
6.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
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* Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/cpu.h>
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#include <asm/cpu.h>
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#include <asm/cpu-info.h>
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#include <asm/mipsregs.h>
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#include <bcm63xx_cpu.h>
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#include <bcm63xx_regs.h>
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#include <bcm63xx_io.h>
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#include <bcm63xx_irq.h>
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const unsigned long *bcm63xx_regs_base;
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EXPORT_SYMBOL(bcm63xx_regs_base);
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const int *bcm63xx_irqs;
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EXPORT_SYMBOL(bcm63xx_irqs);
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static u16 bcm63xx_cpu_id;
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static u16 bcm63xx_cpu_rev;
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static unsigned int bcm63xx_cpu_freq;
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static unsigned int bcm63xx_memory_size;
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static const unsigned long bcm6338_regs_base[] = {
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__GEN_CPU_REGS_TABLE(6338)
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};
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static const int bcm6338_irqs[] = {
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__GEN_CPU_IRQ_TABLE(6338)
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};
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static const unsigned long bcm6345_regs_base[] = {
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__GEN_CPU_REGS_TABLE(6345)
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};
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static const int bcm6345_irqs[] = {
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__GEN_CPU_IRQ_TABLE(6345)
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};
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static const unsigned long bcm6348_regs_base[] = {
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__GEN_CPU_REGS_TABLE(6348)
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};
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static const int bcm6348_irqs[] = {
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__GEN_CPU_IRQ_TABLE(6348)
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};
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static const unsigned long bcm6358_regs_base[] = {
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__GEN_CPU_REGS_TABLE(6358)
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};
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static const int bcm6358_irqs[] = {
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__GEN_CPU_IRQ_TABLE(6358)
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};
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static const unsigned long bcm6368_regs_base[] = {
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__GEN_CPU_REGS_TABLE(6368)
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};
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static const int bcm6368_irqs[] = {
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__GEN_CPU_IRQ_TABLE(6368)
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};
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u16 __bcm63xx_get_cpu_id(void)
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{
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return bcm63xx_cpu_id;
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}
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EXPORT_SYMBOL(__bcm63xx_get_cpu_id);
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u16 bcm63xx_get_cpu_rev(void)
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{
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return bcm63xx_cpu_rev;
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}
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EXPORT_SYMBOL(bcm63xx_get_cpu_rev);
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unsigned int bcm63xx_get_cpu_freq(void)
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{
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return bcm63xx_cpu_freq;
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}
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unsigned int bcm63xx_get_memory_size(void)
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{
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return bcm63xx_memory_size;
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}
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static unsigned int detect_cpu_clock(void)
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{
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switch (bcm63xx_get_cpu_id()) {
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case BCM6338_CPU_ID:
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/* BCM6338 has a fixed 240 Mhz frequency */
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return 240000000;
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case BCM6345_CPU_ID:
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/* BCM6345 has a fixed 140Mhz frequency */
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return 140000000;
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case BCM6348_CPU_ID:
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{
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unsigned int tmp, n1, n2, m1;
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/* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */
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tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG);
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n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT;
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n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT;
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m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT;
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n1 += 1;
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n2 += 2;
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m1 += 1;
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return (16 * 1000000 * n1 * n2) / m1;
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}
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case BCM6358_CPU_ID:
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{
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unsigned int tmp, n1, n2, m1;
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/* 16MHz * N1 * N2 / M1_CPU */
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tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG);
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n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT;
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n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT;
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m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT;
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return (16 * 1000000 * n1 * n2) / m1;
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}
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case BCM6368_CPU_ID:
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{
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unsigned int tmp, p1, p2, ndiv, m1;
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/* (64MHz / P1) * P2 * NDIV / M1_CPU */
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tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_6368_REG);
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p1 = (tmp & DMIPSPLLCFG_6368_P1_MASK) >>
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DMIPSPLLCFG_6368_P1_SHIFT;
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p2 = (tmp & DMIPSPLLCFG_6368_P2_MASK) >>
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DMIPSPLLCFG_6368_P2_SHIFT;
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ndiv = (tmp & DMIPSPLLCFG_6368_NDIV_MASK) >>
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DMIPSPLLCFG_6368_NDIV_SHIFT;
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tmp = bcm_ddr_readl(DDR_DMIPSPLLDIV_6368_REG);
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m1 = (tmp & DMIPSPLLDIV_6368_MDIV_MASK) >>
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DMIPSPLLDIV_6368_MDIV_SHIFT;
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return (((64 * 1000000) / p1) * p2 * ndiv) / m1;
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}
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default:
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BUG();
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}
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}
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/*
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* attempt to detect the amount of memory installed
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*/
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static unsigned int detect_memory_size(void)
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{
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unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
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u32 val;
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if (BCMCPU_IS_6345()) {
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val = bcm_sdram_readl(SDRAM_MBASE_REG);
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return (val * 8 * 1024 * 1024);
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}
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if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
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val = bcm_sdram_readl(SDRAM_CFG_REG);
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rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT;
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cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT;
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is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0;
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banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1;
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}
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if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
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val = bcm_memc_readl(MEMC_CFG_REG);
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rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
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cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
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is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
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banks = 2;
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}
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/* 0 => 11 address bits ... 2 => 13 address bits */
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rows += 11;
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/* 0 => 8 address bits ... 2 => 10 address bits */
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cols += 8;
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return 1 << (cols + rows + (is_32bits + 1) + banks);
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}
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void __init bcm63xx_cpu_init(void)
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{
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unsigned int tmp, expected_cpu_id;
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struct cpuinfo_mips *c = ¤t_cpu_data;
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unsigned int cpu = smp_processor_id();
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/* soc registers location depends on cpu type */
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expected_cpu_id = 0;
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switch (c->cputype) {
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case CPU_BMIPS3300:
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if ((read_c0_prid() & 0xff00) == PRID_IMP_BMIPS3300_ALT) {
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expected_cpu_id = BCM6348_CPU_ID;
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bcm63xx_regs_base = bcm6348_regs_base;
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bcm63xx_irqs = bcm6348_irqs;
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} else {
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__cpu_name[cpu] = "Broadcom BCM6338";
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expected_cpu_id = BCM6338_CPU_ID;
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bcm63xx_regs_base = bcm6338_regs_base;
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bcm63xx_irqs = bcm6338_irqs;
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}
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break;
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case CPU_BMIPS32:
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expected_cpu_id = BCM6345_CPU_ID;
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bcm63xx_regs_base = bcm6345_regs_base;
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bcm63xx_irqs = bcm6345_irqs;
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break;
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case CPU_BMIPS4350:
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switch (read_c0_prid() & 0xf0) {
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case 0x10:
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expected_cpu_id = BCM6358_CPU_ID;
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bcm63xx_regs_base = bcm6358_regs_base;
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bcm63xx_irqs = bcm6358_irqs;
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break;
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case 0x30:
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expected_cpu_id = BCM6368_CPU_ID;
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bcm63xx_regs_base = bcm6368_regs_base;
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bcm63xx_irqs = bcm6368_irqs;
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break;
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}
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break;
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}
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/*
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* really early to panic, but delaying panic would not help since we
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* will never get any working console
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*/
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if (!expected_cpu_id)
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panic("unsupported Broadcom CPU");
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/*
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* bcm63xx_regs_base is set, we can access soc registers
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*/
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/* double check CPU type */
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tmp = bcm_perf_readl(PERF_REV_REG);
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bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
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bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;
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if (bcm63xx_cpu_id != expected_cpu_id)
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panic("bcm63xx CPU id mismatch");
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bcm63xx_cpu_freq = detect_cpu_clock();
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bcm63xx_memory_size = detect_memory_size();
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printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n",
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bcm63xx_cpu_id, bcm63xx_cpu_rev);
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printk(KERN_INFO "CPU frequency is %u MHz\n",
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bcm63xx_cpu_freq / 1000000);
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printk(KERN_INFO "%uMB of RAM installed\n",
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bcm63xx_memory_size >> 20);
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}
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