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qemu/hw/misc/imx_ccm.c

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/*
* IMX31 Clock Control Module
*
* Copyright (C) 2012 NICTA
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
* To get the timer frequencies right, we need to emulate at least part of
* the CCM.
*/
#include "hw/hw.h"
#include "hw/sysbus.h"
#include "sysemu/sysemu.h"
#include "hw/arm/imx.h"
#define CKIH_FREQ 26000000 /* 26MHz crystal input */
#define CKIL_FREQ 32768 /* nominal 32khz clock */
//#define DEBUG_CCM 1
#ifdef DEBUG_CCM
#define DPRINTF(fmt, args...) \
do { printf("imx_ccm: " fmt , ##args); } while (0)
#else
#define DPRINTF(fmt, args...) do {} while (0)
#endif
static int imx_ccm_post_load(void *opaque, int version_id);
#define TYPE_IMX_CCM "imx_ccm"
#define IMX_CCM(obj) OBJECT_CHECK(IMXCCMState, (obj), TYPE_IMX_CCM)
typedef struct IMXCCMState {
SysBusDevice parent_obj;
MemoryRegion iomem;
uint32_t ccmr;
uint32_t pdr0;
uint32_t pdr1;
uint32_t mpctl;
uint32_t spctl;
uint32_t cgr[3];
uint32_t pmcr0;
uint32_t pmcr1;
/* Frequencies precalculated on register changes */
uint32_t pll_refclk_freq;
uint32_t mcu_clk_freq;
uint32_t hsp_clk_freq;
uint32_t ipg_clk_freq;
} IMXCCMState;
static const VMStateDescription vmstate_imx_ccm = {
.name = "imx-ccm",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(ccmr, IMXCCMState),
VMSTATE_UINT32(pdr0, IMXCCMState),
VMSTATE_UINT32(pdr1, IMXCCMState),
VMSTATE_UINT32(mpctl, IMXCCMState),
VMSTATE_UINT32(spctl, IMXCCMState),
VMSTATE_UINT32_ARRAY(cgr, IMXCCMState, 3),
VMSTATE_UINT32(pmcr0, IMXCCMState),
VMSTATE_UINT32(pmcr1, IMXCCMState),
VMSTATE_UINT32(pll_refclk_freq, IMXCCMState),
},
.post_load = imx_ccm_post_load,
};
/* CCMR */
#define CCMR_FPME (1<<0)
#define CCMR_MPE (1<<3)
#define CCMR_MDS (1<<7)
#define CCMR_FPMF (1<<26)
#define CCMR_PRCS (3<<1)
/* PDR0 */
#define PDR0_MCU_PODF_SHIFT (0)
#define PDR0_MCU_PODF_MASK (0x7)
#define PDR0_MAX_PODF_SHIFT (3)
#define PDR0_MAX_PODF_MASK (0x7)
#define PDR0_IPG_PODF_SHIFT (6)
#define PDR0_IPG_PODF_MASK (0x3)
#define PDR0_NFC_PODF_SHIFT (8)
#define PDR0_NFC_PODF_MASK (0x7)
#define PDR0_HSP_PODF_SHIFT (11)
#define PDR0_HSP_PODF_MASK (0x7)
#define PDR0_PER_PODF_SHIFT (16)
#define PDR0_PER_PODF_MASK (0x1f)
#define PDR0_CSI_PODF_SHIFT (23)
#define PDR0_CSI_PODF_MASK (0x1ff)
#define EXTRACT(value, name) (((value) >> PDR0_##name##_PODF_SHIFT) \
& PDR0_##name##_PODF_MASK)
#define INSERT(value, name) (((value) & PDR0_##name##_PODF_MASK) << \
PDR0_##name##_PODF_SHIFT)
/* PLL control registers */
#define PD(v) (((v) >> 26) & 0xf)
#define MFD(v) (((v) >> 16) & 0x3ff)
#define MFI(v) (((v) >> 10) & 0xf);
#define MFN(v) ((v) & 0x3ff)
#define PLL_PD(x) (((x) & 0xf) << 26)
#define PLL_MFD(x) (((x) & 0x3ff) << 16)
#define PLL_MFI(x) (((x) & 0xf) << 10)
#define PLL_MFN(x) (((x) & 0x3ff) << 0)
uint32_t imx_clock_frequency(DeviceState *dev, IMXClk clock)
{
IMXCCMState *s = IMX_CCM(dev);
switch (clock) {
case NOCLK:
return 0;
case MCU:
return s->mcu_clk_freq;
case HSP:
return s->hsp_clk_freq;
case IPG:
return s->ipg_clk_freq;
case CLK_32k:
return CKIL_FREQ;
}
return 0;
}
/*
* Calculate PLL output frequency
*/
static uint32_t calc_pll(uint32_t pllreg, uint32_t base_freq)
{
int32_t mfn = MFN(pllreg); /* Numerator */
uint32_t mfi = MFI(pllreg); /* Integer part */
uint32_t mfd = 1 + MFD(pllreg); /* Denominator */
uint32_t pd = 1 + PD(pllreg); /* Pre-divider */
if (mfi < 5) {
mfi = 5;
}
/* mfn is 10-bit signed twos-complement */
mfn <<= 32 - 10;
mfn >>= 32 - 10;
return ((2 * (base_freq >> 10) * (mfi * mfd + mfn)) /
(mfd * pd)) << 10;
}
static void update_clocks(IMXCCMState *s)
{
/*
* If we ever emulate more clocks, this should switch to a data-driven
* approach
*/
if ((s->ccmr & CCMR_PRCS) == 2) {
s->pll_refclk_freq = CKIL_FREQ * 1024;
} else {
s->pll_refclk_freq = CKIH_FREQ;
}
/* ipg_clk_arm aka MCU clock */
if ((s->ccmr & CCMR_MDS) || !(s->ccmr & CCMR_MPE)) {
s->mcu_clk_freq = s->pll_refclk_freq;
} else {
s->mcu_clk_freq = calc_pll(s->mpctl, s->pll_refclk_freq);
}
/* High-speed clock */
s->hsp_clk_freq = s->mcu_clk_freq / (1 + EXTRACT(s->pdr0, HSP));
s->ipg_clk_freq = s->hsp_clk_freq / (1 + EXTRACT(s->pdr0, IPG));
DPRINTF("Clocks: mcu %uMHz, HSP %uMHz, IPG %uHz\n",
s->mcu_clk_freq / 1000000,
s->hsp_clk_freq / 1000000,
s->ipg_clk_freq);
}
static void imx_ccm_reset(DeviceState *dev)
{
IMXCCMState *s = IMX_CCM(dev);
s->ccmr = 0x074b0b7b;
s->pdr0 = 0xff870b48;
s->pdr1 = 0x49fcfe7f;
s->mpctl = PLL_PD(1) | PLL_MFD(0) | PLL_MFI(6) | PLL_MFN(0);
s->cgr[0] = s->cgr[1] = s->cgr[2] = 0xffffffff;
s->spctl = PLL_PD(1) | PLL_MFD(4) | PLL_MFI(0xc) | PLL_MFN(1);
s->pmcr0 = 0x80209828;
update_clocks(s);
}
static uint64_t imx_ccm_read(void *opaque, hwaddr offset,
unsigned size)
{
IMXCCMState *s = (IMXCCMState *)opaque;
DPRINTF("read(offset=%x)", offset >> 2);
switch (offset >> 2) {
case 0: /* CCMR */
DPRINTF(" ccmr = 0x%x\n", s->ccmr);
return s->ccmr;
case 1:
DPRINTF(" pdr0 = 0x%x\n", s->pdr0);
return s->pdr0;
case 2:
DPRINTF(" pdr1 = 0x%x\n", s->pdr1);
return s->pdr1;
case 4:
DPRINTF(" mpctl = 0x%x\n", s->mpctl);
return s->mpctl;
case 6:
DPRINTF(" spctl = 0x%x\n", s->spctl);
return s->spctl;
case 8:
DPRINTF(" cgr0 = 0x%x\n", s->cgr[0]);
return s->cgr[0];
case 9:
DPRINTF(" cgr1 = 0x%x\n", s->cgr[1]);
return s->cgr[1];
case 10:
DPRINTF(" cgr2 = 0x%x\n", s->cgr[2]);
return s->cgr[2];
case 18: /* LTR1 */
return 0x00004040;
case 23:
DPRINTF(" pcmr0 = 0x%x\n", s->pmcr0);
return s->pmcr0;
}
DPRINTF(" return 0\n");
return 0;
}
static void imx_ccm_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
IMXCCMState *s = (IMXCCMState *)opaque;
DPRINTF("write(offset=%x, value = %x)\n",
offset >> 2, (unsigned int)value);
switch (offset >> 2) {
case 0:
s->ccmr = CCMR_FPMF | (value & 0x3b6fdfff);
break;
case 1:
s->pdr0 = value & 0xff9f3fff;
break;
case 2:
s->pdr1 = value;
break;
case 4:
s->mpctl = value & 0xbfff3fff;
break;
case 6:
s->spctl = value & 0xbfff3fff;
break;
case 8:
s->cgr[0] = value;
return;
case 9:
s->cgr[1] = value;
return;
case 10:
s->cgr[2] = value;
return;
default:
return;
}
update_clocks(s);
}
static const struct MemoryRegionOps imx_ccm_ops = {
.read = imx_ccm_read,
.write = imx_ccm_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static int imx_ccm_init(SysBusDevice *dev)
{
IMXCCMState *s = IMX_CCM(dev);
memory_region_init_io(&s->iomem, OBJECT(dev), &imx_ccm_ops, s,
"imx_ccm", 0x1000);
sysbus_init_mmio(dev, &s->iomem);
return 0;
}
static int imx_ccm_post_load(void *opaque, int version_id)
{
IMXCCMState *s = (IMXCCMState *)opaque;
update_clocks(s);
return 0;
}
static void imx_ccm_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *sbc = SYS_BUS_DEVICE_CLASS(klass);
sbc->init = imx_ccm_init;
dc->reset = imx_ccm_reset;
dc->vmsd = &vmstate_imx_ccm;
dc->desc = "i.MX Clock Control Module";
}
static const TypeInfo imx_ccm_info = {
.name = TYPE_IMX_CCM,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(IMXCCMState),
.class_init = imx_ccm_class_init,
};
static void imx_ccm_register_types(void)
{
type_register_static(&imx_ccm_info);
}
type_init(imx_ccm_register_types)
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