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Re: [Qemu-devel] [PATCH v3 3/3] i.MX: Add an i.MX25 specific CCM class/i

From: Jean-Christophe DUBOIS
Subject: Re: [Qemu-devel] [PATCH v3 3/3] i.MX: Add an i.MX25 specific CCM class/instance.
Date: Thu, 26 Nov 2015 08:14:16 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 
Le 25/11/2015 06:51, Peter Crosthwaite a écrit :

On Thu, Nov 19, 2015 at 12:40 PM, Jean-Christophe Dubois
<address@hidden> wrote:

Signed-off-by: Jean-Christophe Dubois <address@hidden>
---

Changes since v1:
  * rework loging to match other i.MX drivers

Changes since v2:
  * We moved to an inheritance QOM scheme

  hw/arm/fsl-imx25.c          |   2 +-
  hw/misc/Makefile.objs       |   1 +
  hw/misc/imx25_ccm.c         | 243 ++++++++++++++++++++++++++++++++++++++++++++
  include/hw/arm/fsl-imx25.h  |   4 +-
  include/hw/misc/imx25_ccm.h |  59 +++++++++++
  5 files changed, 306 insertions(+), 3 deletions(-)
  create mode 100644 hw/misc/imx25_ccm.c
  create mode 100644 include/hw/misc/imx25_ccm.h

diff --git a/hw/arm/fsl-imx25.c b/hw/arm/fsl-imx25.c
index 5526c22..0aacc91 100644
--- a/hw/arm/fsl-imx25.c
+++ b/hw/arm/fsl-imx25.c
@@ -38,7 +38,7 @@ static void fsl_imx25_init(Object *obj)
      object_initialize(&s->avic, sizeof(s->avic), TYPE_IMX_AVIC);
      qdev_set_parent_bus(DEVICE(&s->avic), sysbus_get_default());

-    object_initialize(&s->ccm, sizeof(s->ccm), TYPE_IMX31_CCM);
+    object_initialize(&s->ccm, sizeof(s->ccm), TYPE_IMX25_CCM);
      qdev_set_parent_bus(DEVICE(&s->ccm), sysbus_get_default());

      for (i = 0; i < FSL_IMX25_NUM_UARTS; i++) {
diff --git a/hw/misc/Makefile.objs b/hw/misc/Makefile.objs
index c77f3e3..8a235df 100644
--- a/hw/misc/Makefile.objs
+++ b/hw/misc/Makefile.objs
@@ -27,6 +27,7 @@ obj-$(CONFIG_ECCMEMCTL) += eccmemctl.o
  obj-$(CONFIG_EXYNOS4) += exynos4210_pmu.o
  obj-$(CONFIG_IMX) += imx_ccm.o
  obj-$(CONFIG_IMX) += imx31_ccm.o
+obj-$(CONFIG_IMX) += imx25_ccm.o
  obj-$(CONFIG_MILKYMIST) += milkymist-hpdmc.o
  obj-$(CONFIG_MILKYMIST) += milkymist-pfpu.o
  obj-$(CONFIG_MAINSTONE) += mst_fpga.o
diff --git a/hw/misc/imx25_ccm.c b/hw/misc/imx25_ccm.c
new file mode 100644
index 0000000..a6c9bff
--- /dev/null
+++ b/hw/misc/imx25_ccm.c
@@ -0,0 +1,243 @@
+/*
+ * IMX25 Clock Control Module
+ *
+ * Copyright (C) 2012 NICTA
+ * Updated by Jean-Christophe Dubois <address@hidden>
+ *
+ * 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/misc/imx25_ccm.h"
+
+#ifndef DEBUG_IMX25_CCM
+#define DEBUG_IMX25_CCM 0
+#endif
+
+#define DPRINTF(fmt, args...) \
+    do { \
+        if (DEBUG_IMX25_CCM) { \
+            fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX25_CCM, \
+                                             __func__, ##args); \
+        } \
+    } while (0)
+
+#define CKIH_FREQ 24000000 /* 24MHz crystal input */
+
+static const VMStateDescription vmstate_imx25_ccm = {
+    .name = TYPE_IMX25_CCM,
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(mpctl, IMX25CCMState),
+        VMSTATE_UINT32(upctl, IMX25CCMState),
+        VMSTATE_UINT32(cctl, IMX25CCMState),
+        VMSTATE_UINT32_ARRAY(cgcr, IMX25CCMState, 3),
+        VMSTATE_UINT32_ARRAY(pcdr, IMX25CCMState, 4),
+        VMSTATE_UINT32(rcsr, IMX25CCMState),
+        VMSTATE_UINT32(crdr, IMX25CCMState),
+        VMSTATE_UINT32_ARRAY(dcvr, IMX25CCMState, 4),
+        VMSTATE_UINT32_ARRAY(ltr, IMX25CCMState, 4),
+        VMSTATE_UINT32_ARRAY(ltbr, IMX25CCMState, 2),
+        VMSTATE_UINT32_ARRAY(pmcr, IMX25CCMState, 3),
+        VMSTATE_UINT32(mcr, IMX25CCMState),
+        VMSTATE_UINT32_ARRAY(lpimr, IMX25CCMState, 2),
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+static uint32_t imx25_ccm_get_mpll_clk(DeviceState *dev)
+{
+    IMX25CCMState *s = IMX25_CCM(dev);
+
+    DPRINTF("()\n");
+
+    if (EXTRACT(s->cctl, MPLL_BYPASS)) {
+        return CKIH_FREQ;
+    } else {
+        return imx_ccm_calc_pll(s->mpctl, CKIH_FREQ);
+    }
+}
+
+static uint32_t imx25_ccm_get_upll_clk(DeviceState *dev)
+{
+    IMX25CCMState *s = IMX25_CCM(dev);
+
+    DPRINTF("()\n");
+
+    return imx_ccm_calc_pll(s->upctl, CKIH_FREQ);
+}
+
+static uint32_t imx25_ccm_get_mcu_clk(DeviceState *dev)
+{
+    IMX25CCMState *s = IMX25_CCM(dev);
+
+    DPRINTF("()\n");
+
+    if (EXTRACT(s->cctl, ARM_SRC)) {
+        return (imx25_ccm_get_mpll_clk(dev) * 3 / 4) /
+               (1 + EXTRACT(s->cctl, ARM_CLK_DIV));
+    } else {
+        return imx25_ccm_get_mpll_clk(dev) /
+               (1 + EXTRACT(s->cctl, ARM_CLK_DIV));
+    }
+}
+
+static uint32_t imx25_ccm_get_ahb_clk(DeviceState *dev)
+{
+    IMX25CCMState *s = IMX25_CCM(dev);
+
+    DPRINTF("()\n");
+
+    return imx25_ccm_get_mcu_clk(dev) / (1 + EXTRACT(s->cctl, AHB_CLK_DIV));
+}
+
+static uint32_t imx25_ccm_get_ipg_clk(DeviceState *dev)
+{
+    DPRINTF("()\n");
+
+    return imx25_ccm_get_ahb_clk(dev) / 2;
+}
+
+static uint32_t imx25_ccm_get_clock_frequency(DeviceState *dev, IMXClk clock)
+{
+    DPRINTF("Clock = %d)\n", clock);

This would be more useful if it was at the end and grabbed the return
value too (similar to what's commonly done for an MMIO read function).

OK




+
+    switch (clock) {
+    case NOCLK:
+        return 0;
+    case CLK_MPLL:
+        return imx25_ccm_get_mpll_clk(dev);
+    case CLK_UPLL:
+        return imx25_ccm_get_upll_clk(dev);
+    case CLK_MCU:
+        return imx25_ccm_get_mcu_clk(dev);
+    case CLK_AHB:
+        return imx25_ccm_get_ahb_clk(dev);
+    case CLK_IPG:
+        return imx25_ccm_get_ipg_clk(dev);
+    case CLK_32k:
+        return CKIL_FREQ;
+    default:
+        return 0;

Is this condition guest creatable? If so should it be LOG_GUEST_ERROR?
If it is supposed to be unreachable even by guest error, then it
should g_assert_not_reached().


OK




+    }
+}
+
+static void imx25_ccm_reset(DeviceState *dev)
+{
+    IMX25CCMState *s = IMX25_CCM(dev);
+
+    DPRINTF("\n");
+
+    s->mpctl = 0x800b2c01;
+    s->upctl = 0x84002800;
+    s->cctl = 0x40030000;
+    s->cgcr[0] = 0x028A0100;
+    s->cgcr[1] = 0x04008100;
+    s->cgcr[2] = 0x00000438;
+    s->pcdr[0] = 0x01010101;
+    s->pcdr[1] = 0x01010101;
+    s->pcdr[2] = 0x01010101;
+    s->pcdr[3] = 0x01010101;
+    s->rcsr = 0;
+    s->crdr = 0;
+    s->dcvr[0] = 0;
+    s->dcvr[1] = 0;
+    s->dcvr[2] = 0;
+    s->dcvr[3] = 0;
+    s->ltr[0] = 0;
+    s->ltr[1] = 0;
+    s->ltr[2] = 0;
+    s->ltr[3] = 0;
+    s->ltbr[0] = 0;
+    s->ltbr[1] = 0;


With the union-struct approach (see below), you can memset 0 the whole
thing then set the non-zeros after for a shorter result.


+    s->pmcr[0] = 0x00A00000;
+    s->pmcr[1] = 0x0000A030;
+    s->pmcr[2] = 0x0000A030;
+    s->mcr = 0x43000000;
+    s->lpimr[0] = 0;
+    s->lpimr[1] = 0;
+
+    /* default ROM boot will change the reset values */
+    s->cctl |= INSERT(1, ARM_SRC);
+    s->cctl |= INSERT(1, AHB_CLK_DIV);
+}
+
+static uint64_t imx25_ccm_read(void *opaque, hwaddr offset, unsigned size)
+{
+    IMX25CCMState *s = (IMX25CCMState *)opaque;
+    uint32_t *reg = &s->mpctl;

If you want the best of both worlds for the register indexing scheme
(e.g. array + set of names) an anonymous union-struct would work
better. There are some in tree precedents. E.g. from hcd-ehci.h:

     union {
         uint32_t opreg[0x44/sizeof(uint32_t)];
         struct {
             uint32_t usbcmd;
             uint32_t usbsts;
             uint32_t usbintr;
             uint32_t frindex;
             uint32_t ctrldssegment;
             uint32_t periodiclistbase;
             uint32_t asynclistaddr;
             uint32_t notused[9];
             uint32_t configflag;
         };
     };
Well, I think I'll move later to an uint32_t array only with REG name values as index. 
But I'll do it for both i.MX25 and i.MX31 at the same time.





+
+    DPRINTF("(offset=0x%" HWADDR_PRIx ")\n", offset);
+

Delay to give return value as well.


+    if (offset < 0x70) {
+        return reg[offset >> 2];
+    } else {
+        return 0;
+    }
+}
+
+static void imx25_ccm_write(void *opaque, hwaddr offset, uint64_t value,
+                            unsigned size)
+{
+    IMX25CCMState *s = (IMX25CCMState *)opaque;
+    uint32_t *reg = &s->mpctl;
+
+    DPRINTF("(offset=0x%" HWADDR_PRIx ", value = %x)\n",
+            offset, (unsigned int)value);

The cast of value should be to an IP meaningful type. As reg's are 32
bit, it should be a uint32_t with PRIx32.


OK




+
+    if (offset < 0x70) {
+        /*
+         * We will do a better implementation later. In particular some bits
+         * cannot be writen to.

"written"


+         */
+        reg[offset >> 2] = value;
+    }
+}
+
+static const struct MemoryRegionOps imx25_ccm_ops = {
+    .read = imx25_ccm_read,
+    .write = imx25_ccm_write,

Your IP doesn't handle sub-word access, so should the size restrictions be here?

We have a new sub-mailing list for ARM related work.
address@hidden You can CC to that (as well as qemu-devel) for
the i.MX stuff to get a wider ARM review community.


OK



Thanks.

Regards,
Peter


+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void imx25_ccm_init(Object *obj)
+{
+    DeviceState *dev = DEVICE(obj);
+    SysBusDevice *sd = SYS_BUS_DEVICE(obj);
+    IMX25CCMState *s = IMX25_CCM(obj);
+
+    memory_region_init_io(&s->iomem, OBJECT(dev), &imx25_ccm_ops, s,
+                          TYPE_IMX25_CCM, 0x1000);
+    sysbus_init_mmio(sd, &s->iomem);
+}
+
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