diff options
Diffstat (limited to 'hw/misc/imx_ccm.c')
| -rw-r--r-- | hw/misc/imx_ccm.c | 231 |
1 files changed, 22 insertions, 209 deletions
diff --git a/hw/misc/imx_ccm.c b/hw/misc/imx_ccm.c index 1ac697a998..0c9740bd7a 100644 --- a/hw/misc/imx_ccm.c +++ b/hw/misc/imx_ccm.c @@ -7,15 +7,12 @@ * 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. + * This is an abstract base class used to get a common interface to + * retrieve the CCM frequencies from the various i.MX SOC. */ #include "hw/misc/imx_ccm.h" -#define CKIH_FREQ 26000000 /* 26MHz crystal input */ -#define CKIL_FREQ 32768 /* nominal 32khz clock */ - #ifndef DEBUG_IMX_CCM #define DEBUG_IMX_CCM 0 #endif @@ -28,51 +25,27 @@ } \ } while (0) -static int imx_ccm_post_load(void *opaque, int version_id); - -static const VMStateDescription vmstate_imx_ccm = { - .name = TYPE_IMX_CCM, - .version_id = 1, - .minimum_version_id = 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), - VMSTATE_END_OF_LIST() - }, - .post_load = imx_ccm_post_load, -}; -uint32_t imx_ccm_get_clock_frequency(DeviceState *dev, IMXClk clock) +uint32_t imx_ccm_get_clock_frequency(IMXCCMState *dev, IMXClk clock) { - IMXCCMState *s = IMX_CCM(dev); + uint32_t freq = 0; + IMXCCMClass *klass = IMX_GET_CLASS(dev); - switch (clock) { - case NOCLK: - return 0; - case CLK_MCU: - return s->mcu_clk_freq; - case CLK_HSP: - return s->hsp_clk_freq; - case CLK_IPG: - return s->ipg_clk_freq; - case CLK_32k: - return CKIL_FREQ; + if (klass->get_clock_frequency) { + freq = klass->get_clock_frequency(dev, clock); } - return 0; + + DPRINTF("(clock = %d) = %d\n", clock, freq); + + return freq; } /* * Calculate PLL output frequency */ -static uint32_t calc_pll(uint32_t pllreg, uint32_t base_freq) +uint32_t imx_ccm_calc_pll(uint32_t pllreg, uint32_t base_freq) { + int32_t freq; int32_t mfn = MFN(pllreg); /* Numerator */ uint32_t mfi = MFI(pllreg); /* Integer part */ uint32_t mfd = 1 + MFD(pllreg); /* Denominator */ @@ -81,186 +54,26 @@ static uint32_t calc_pll(uint32_t pllreg, uint32_t base_freq) 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)) / + freq = ((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("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 = 0x074b0b7d; - 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("(offset=0x%" HWADDR_PRIx ")\n", offset); - - 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; - default: - qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" - HWADDR_PRIx "\n", TYPE_IMX_CCM, __func__, offset); - return 0; - } -} - -static void imx_ccm_write(void *opaque, hwaddr offset, - uint64_t value, unsigned size) -{ - IMXCCMState *s = (IMXCCMState *)opaque; - - DPRINTF("(offset=0x%" HWADDR_PRIx ", value = 0x%x)\n", - offset, (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: - qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" - HWADDR_PRIx "\n", TYPE_IMX_CCM, __func__, offset); - 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, - TYPE_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); + DPRINTF("(pllreg = 0x%08x, base_freq = %d) = %d\n", pllreg, base_freq, + freq); - sbc->init = imx_ccm_init; - dc->reset = imx_ccm_reset; - dc->vmsd = &vmstate_imx_ccm; - dc->desc = "i.MX Clock Control Module"; + return freq; } static const TypeInfo imx_ccm_info = { - .name = TYPE_IMX_CCM, - .parent = TYPE_SYS_BUS_DEVICE, + .name = TYPE_IMX_CCM, + .parent = TYPE_SYS_BUS_DEVICE, .instance_size = sizeof(IMXCCMState), - .class_init = imx_ccm_class_init, + .class_size = sizeof(IMXCCMClass), + .abstract = true, }; static void imx_ccm_register_types(void) |