5e189564d5
Probe the img-ascii-lcd driver using device tree in order to display a message on the SEAD3 board's LCD display, and remove the platform code that was formerly performing this function. This removes more platform code and moves SEAD3 further towards being entirely DT-based. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Jacek Anaszewski <j.anaszewski@samsung.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-mips@linux-mips.org Cc: devicetree@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14063/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
98 lines
2.2 KiB
C
98 lines
2.2 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) 2012 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/irqchip/mips-gic.h>
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#include <asm/cpu.h>
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#include <asm/setup.h>
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#include <asm/time.h>
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#include <asm/irq.h>
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#include <asm/mips-boards/generic.h>
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static void __iomem *status_reg = (void __iomem *)0xbf000410;
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/*
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* Estimate CPU frequency. Sets mips_hpt_frequency as a side-effect.
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*/
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static unsigned int __init estimate_cpu_frequency(void)
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{
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unsigned int prid = read_c0_prid() & (PRID_COMP_MASK | PRID_IMP_MASK);
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unsigned int tick = 0;
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unsigned int freq;
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unsigned int orig;
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unsigned long flags;
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local_irq_save(flags);
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orig = readl(status_reg) & 0x2; /* get original sample */
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/* wait for transition */
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while ((readl(status_reg) & 0x2) == orig)
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;
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orig = orig ^ 0x2; /* flip the bit */
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write_c0_count(0);
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/* wait 1 second (the sampling clock transitions every 10ms) */
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while (tick < 100) {
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/* wait for transition */
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while ((readl(status_reg) & 0x2) == orig)
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;
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orig = orig ^ 0x2; /* flip the bit */
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tick++;
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}
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freq = read_c0_count();
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local_irq_restore(flags);
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mips_hpt_frequency = freq;
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/* Adjust for processor */
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if ((prid != (PRID_COMP_MIPS | PRID_IMP_20KC)) &&
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(prid != (PRID_COMP_MIPS | PRID_IMP_25KF)))
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freq *= 2;
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freq += 5000; /* rounding */
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freq -= freq%10000;
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return freq ;
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}
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void read_persistent_clock(struct timespec *ts)
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{
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ts->tv_sec = 0;
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ts->tv_nsec = 0;
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}
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int get_c0_perfcount_int(void)
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{
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if (gic_present)
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return gic_get_c0_perfcount_int();
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if (cp0_perfcount_irq >= 0)
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return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq;
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return -1;
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}
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EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
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unsigned int get_c0_compare_int(void)
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{
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if (gic_present)
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return gic_get_c0_compare_int();
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return MIPS_CPU_IRQ_BASE + cp0_compare_irq;
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}
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void __init plat_time_init(void)
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{
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unsigned int est_freq;
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est_freq = estimate_cpu_frequency();
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pr_debug("CPU frequency %d.%02d MHz\n", (est_freq / 1000000),
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(est_freq % 1000000) * 100 / 1000000);
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}
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