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hw/misc: Add NPCM7xx Clock Controller device model

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Enough functionality to boot the Linux kernel has been implemented. This
includes:

  - Correct power-on reset values so the various clock rates can be
    accurately calculated.
  - Clock enables stick around when written.

In addition, a best effort attempt to implement SECCNT and CNTR25M was
made even though I don't think the kernel needs them.

Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-id: 20200911052101.2602693-3-hskinnemoen@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Havard Skinnemoen 2020-09-10 22:20:49 -07:00 • committed by Peter Maydell
parent e5a7ba8788
commit e331f79eb8
4 changed files with 319 additions and 0 deletions
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48
include/hw/misc/npcm7xx_clk.h Normal file
View file

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/*
* Nuvoton NPCM7xx Clock Control Registers.
*
* Copyright 2020 Google LLC
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#ifndef NPCM7XX_CLK_H
#define NPCM7XX_CLK_H
#include "exec/memory.h"
#include "hw/sysbus.h"
/*
* The reference clock frequency for the timer modules, and the SECCNT and
* CNTR25M registers in this module, is always 25 MHz.
*/
#define NPCM7XX_TIMER_REF_HZ (25000000)
/*
* Number of registers in our device state structure. Don't change this without
* incrementing the version_id in the vmstate.
*/
#define NPCM7XX_CLK_NR_REGS (0x70 / sizeof(uint32_t))
typedef struct NPCM7xxCLKState {
SysBusDevice parent;
MemoryRegion iomem;
uint32_t regs[NPCM7XX_CLK_NR_REGS];
/* Time reference for SECCNT and CNTR25M, initialized by power on reset */
int64_t ref_ns;
} NPCM7xxCLKState;
#define TYPE_NPCM7XX_CLK "npcm7xx-clk"
#define NPCM7XX_CLK(obj) OBJECT_CHECK(NPCM7xxCLKState, (obj), TYPE_NPCM7XX_CLK)
#endif /* NPCM7XX_CLK_H */