aspeed/scu: Add AST2700 support

AST2700 have two SCU controllers which are SCU and SCUIO.
Both SCU and SCUIO registers are not compatible previous SOCs
, introduces new registers and adds ast2700 scu, sucio class init handler.

The pclk divider selection of SCUIO is defined in SCUIO280[20:18] and
the pclk divider selection of SCU is defined in SCU280[25:23].
Both of them are not compatible AST2600 SOCs, adds a get_apb_freq function
and trace-event for AST2700 SCU and SCUIO.

Signed-off-by: Troy Lee <troy_lee@aspeedtech.com>
Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
[clg: Fixed spelling : Unhandeled -> Unhandled ]

3 files changed, 351 insertions, 6 deletions

diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index 1ac04b6..451e837 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -134,6 +134,48 @@
 
 #define AST2600_CLK TO_REG(0x40)
 
+#define AST2700_SILICON_REV       TO_REG(0x00)
+#define AST2700_HW_STRAP1         TO_REG(0x10)
+#define AST2700_HW_STRAP1_CLR     TO_REG(0x14)
+#define AST2700_HW_STRAP1_LOCK    TO_REG(0x20)
+#define AST2700_HW_STRAP1_SEC1    TO_REG(0x24)
+#define AST2700_HW_STRAP1_SEC2    TO_REG(0x28)
+#define AST2700_HW_STRAP1_SEC3    TO_REG(0x2C)
+
+#define AST2700_SCU_CLK_SEL_1       TO_REG(0x280)
+#define AST2700_SCU_HPLL_PARAM      TO_REG(0x300)
+#define AST2700_SCU_HPLL_EXT_PARAM  TO_REG(0x304)
+#define AST2700_SCU_DPLL_PARAM      TO_REG(0x308)
+#define AST2700_SCU_DPLL_EXT_PARAM  TO_REG(0x30c)
+#define AST2700_SCU_MPLL_PARAM      TO_REG(0x310)
+#define AST2700_SCU_MPLL_EXT_PARAM  TO_REG(0x314)
+#define AST2700_SCU_D1CLK_PARAM     TO_REG(0x320)
+#define AST2700_SCU_D2CLK_PARAM     TO_REG(0x330)
+#define AST2700_SCU_CRT1CLK_PARAM   TO_REG(0x340)
+#define AST2700_SCU_CRT2CLK_PARAM   TO_REG(0x350)
+#define AST2700_SCU_MPHYCLK_PARAM   TO_REG(0x360)
+#define AST2700_SCU_FREQ_CNTR       TO_REG(0x3b0)
+#define AST2700_SCU_CPU_SCRATCH_0   TO_REG(0x780)
+#define AST2700_SCU_CPU_SCRATCH_1   TO_REG(0x784)
+
+#define AST2700_SCUIO_CLK_STOP_CTL_1    TO_REG(0x240)
+#define AST2700_SCUIO_CLK_STOP_CLR_1    TO_REG(0x244)
+#define AST2700_SCUIO_CLK_STOP_CTL_2    TO_REG(0x260)
+#define AST2700_SCUIO_CLK_STOP_CLR_2    TO_REG(0x264)
+#define AST2700_SCUIO_CLK_SEL_1         TO_REG(0x280)
+#define AST2700_SCUIO_CLK_SEL_2         TO_REG(0x284)
+#define AST2700_SCUIO_HPLL_PARAM        TO_REG(0x300)
+#define AST2700_SCUIO_HPLL_EXT_PARAM    TO_REG(0x304)
+#define AST2700_SCUIO_APLL_PARAM        TO_REG(0x310)
+#define AST2700_SCUIO_APLL_EXT_PARAM    TO_REG(0x314)
+#define AST2700_SCUIO_DPLL_PARAM        TO_REG(0x320)
+#define AST2700_SCUIO_DPLL_EXT_PARAM    TO_REG(0x324)
+#define AST2700_SCUIO_DPLL_PARAM_READ   TO_REG(0x328)
+#define AST2700_SCUIO_DPLL_EXT_PARAM_READ TO_REG(0x32c)
+#define AST2700_SCUIO_UARTCLK_GEN       TO_REG(0x330)
+#define AST2700_SCUIO_HUARTCLK_GEN      TO_REG(0x334)
+#define AST2700_SCUIO_CLK_DUTY_MEAS_RST TO_REG(0x388)
+
 #define SCU_IO_REGION_SIZE 0x1000
 
 static const uint32_t ast2400_a0_resets[ASPEED_SCU_NR_REGS] = {
@@ -244,6 +286,25 @@ static uint32_t aspeed_1030_scu_get_apb_freq(AspeedSCUState *s)
         / asc->apb_divider;
 }
 
+static uint32_t aspeed_2700_scu_get_apb_freq(AspeedSCUState *s)
+{
+    AspeedSCUClass *asc = ASPEED_SCU_GET_CLASS(s);
+    uint32_t hpll = asc->calc_hpll(s, s->regs[AST2700_SCU_HPLL_PARAM]);
+
+    return hpll / (SCU_CLK_GET_PCLK_DIV(s->regs[AST2700_SCU_CLK_SEL_1]) + 1)
+           / asc->apb_divider;
+}
+
+static uint32_t aspeed_2700_scuio_get_apb_freq(AspeedSCUState *s)
+{
+    AspeedSCUClass *asc = ASPEED_SCU_GET_CLASS(s);
+    uint32_t hpll = asc->calc_hpll(s, s->regs[AST2700_SCUIO_HPLL_PARAM]);
+
+    return hpll /
+        (SCUIO_AST2700_CLK_GET_PCLK_DIV(s->regs[AST2700_SCUIO_CLK_SEL_1]) + 1)
+        / asc->apb_divider;
+}
+
 static uint64_t aspeed_scu_read(void *opaque, hwaddr offset, unsigned size)
 {
     AspeedSCUState *s = ASPEED_SCU(opaque);
@@ -258,7 +319,8 @@ static uint64_t aspeed_scu_read(void *opaque, hwaddr offset, unsigned size)
 
     switch (reg) {
     case RNG_DATA:
-        /* On hardware, RNG_DATA works regardless of
+        /*
+         * On hardware, RNG_DATA works regardless of
          * the state of the enable bit in RNG_CTRL
          */
         s->regs[RNG_DATA] = aspeed_scu_get_random();
@@ -494,6 +556,9 @@ static uint32_t aspeed_silicon_revs[] = {
     AST2600_A3_SILICON_REV,
     AST1030_A0_SILICON_REV,
     AST1030_A1_SILICON_REV,
+    AST2700_A0_SILICON_REV,
+    AST2720_A0_SILICON_REV,
+    AST2750_A0_SILICON_REV,
 };
 
 bool is_supported_silicon_rev(uint32_t silicon_rev)
@@ -783,6 +848,243 @@ static const TypeInfo aspeed_2600_scu_info = {
     .class_init = aspeed_2600_scu_class_init,
 };
 
+static uint64_t aspeed_ast2700_scu_read(void *opaque, hwaddr offset,
+                                        unsigned size)
+{
+    AspeedSCUState *s = ASPEED_SCU(opaque);
+    int reg = TO_REG(offset);
+
+    if (reg >= ASPEED_AST2700_SCU_NR_REGS) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
+                __func__, offset);
+        return 0;
+    }
+
+    switch (reg) {
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Unhandled read at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+    }
+
+    trace_aspeed_ast2700_scu_read(offset, size, s->regs[reg]);
+    return s->regs[reg];
+}
+
+static void aspeed_ast2700_scu_write(void *opaque, hwaddr offset,
+                                     uint64_t data64, unsigned size)
+{
+    AspeedSCUState *s = ASPEED_SCU(opaque);
+    int reg = TO_REG(offset);
+    /* Truncate here so bitwise operations below behave as expected */
+    uint32_t data = data64;
+
+    if (reg >= ASPEED_AST2700_SCU_NR_REGS) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
+                __func__, offset);
+        return;
+    }
+
+    trace_aspeed_ast2700_scu_write(offset, size, data);
+
+    switch (reg) {
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Unhandled write at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+        break;
+    }
+
+    s->regs[reg] = data;
+}
+
+static const MemoryRegionOps aspeed_ast2700_scu_ops = {
+    .read = aspeed_ast2700_scu_read,
+    .write = aspeed_ast2700_scu_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 8,
+    .valid.unaligned = false,
+};
+
+static const uint32_t ast2700_a0_resets[ASPEED_AST2700_SCU_NR_REGS] = {
+    [AST2700_SILICON_REV]           = AST2700_A0_SILICON_REV,
+    [AST2700_HW_STRAP1]             = 0x00000800,
+    [AST2700_HW_STRAP1_CLR]         = 0xFFF0FFF0,
+    [AST2700_HW_STRAP1_LOCK]        = 0x00000FFF,
+    [AST2700_HW_STRAP1_SEC1]        = 0x000000FF,
+    [AST2700_HW_STRAP1_SEC2]        = 0x00000000,
+    [AST2700_HW_STRAP1_SEC3]        = 0x1000408F,
+    [AST2700_SCU_HPLL_PARAM]        = 0x0000009f,
+    [AST2700_SCU_HPLL_EXT_PARAM]    = 0x8000004f,
+    [AST2700_SCU_DPLL_PARAM]        = 0x0080009f,
+    [AST2700_SCU_DPLL_EXT_PARAM]    = 0x8000004f,
+    [AST2700_SCU_MPLL_PARAM]        = 0x00000040,
+    [AST2700_SCU_MPLL_EXT_PARAM]    = 0x80000000,
+    [AST2700_SCU_D1CLK_PARAM]       = 0x00050002,
+    [AST2700_SCU_D2CLK_PARAM]       = 0x00050002,
+    [AST2700_SCU_CRT1CLK_PARAM]     = 0x00050002,
+    [AST2700_SCU_CRT2CLK_PARAM]     = 0x00050002,
+    [AST2700_SCU_MPHYCLK_PARAM]     = 0x0000004c,
+    [AST2700_SCU_FREQ_CNTR]         = 0x000375eb,
+    [AST2700_SCU_CPU_SCRATCH_0]     = 0x00000000,
+    [AST2700_SCU_CPU_SCRATCH_1]     = 0x00000004,
+};
+
+static void aspeed_ast2700_scu_reset(DeviceState *dev)
+{
+    AspeedSCUState *s = ASPEED_SCU(dev);
+    AspeedSCUClass *asc = ASPEED_SCU_GET_CLASS(dev);
+
+    memcpy(s->regs, asc->resets, asc->nr_regs * 4);
+}
+
+static void aspeed_2700_scu_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedSCUClass *asc = ASPEED_SCU_CLASS(klass);
+
+    dc->desc = "ASPEED 2700 System Control Unit";
+    dc->reset = aspeed_ast2700_scu_reset;
+    asc->resets = ast2700_a0_resets;
+    asc->calc_hpll = aspeed_2600_scu_calc_hpll;
+    asc->get_apb = aspeed_2700_scu_get_apb_freq;
+    asc->apb_divider = 4;
+    asc->nr_regs = ASPEED_AST2700_SCU_NR_REGS;
+    asc->clkin_25Mhz = true;
+    asc->ops = &aspeed_ast2700_scu_ops;
+}
+
+static uint64_t aspeed_ast2700_scuio_read(void *opaque, hwaddr offset,
+                                        unsigned size)
+{
+    AspeedSCUState *s = ASPEED_SCU(opaque);
+    int reg = TO_REG(offset);
+    if (reg >= ASPEED_AST2700_SCU_NR_REGS) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
+                __func__, offset);
+        return 0;
+    }
+
+    switch (reg) {
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Unhandled read at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+    }
+
+    trace_aspeed_ast2700_scuio_read(offset, size, s->regs[reg]);
+    return s->regs[reg];
+}
+
+static void aspeed_ast2700_scuio_write(void *opaque, hwaddr offset,
+                                     uint64_t data64, unsigned size)
+{
+    AspeedSCUState *s = ASPEED_SCU(opaque);
+    int reg = TO_REG(offset);
+    /* Truncate here so bitwise operations below behave as expected */
+    uint32_t data = data64;
+    bool updated = false;
+
+    if (reg >= ASPEED_AST2700_SCU_NR_REGS) {
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
+                __func__, offset);
+        return;
+    }
+
+    trace_aspeed_ast2700_scuio_write(offset, size, data);
+
+    switch (reg) {
+    case AST2700_SCUIO_CLK_STOP_CTL_1:
+    case AST2700_SCUIO_CLK_STOP_CTL_2:
+        s->regs[reg] |= data;
+        updated = true;
+        break;
+    case AST2700_SCUIO_CLK_STOP_CLR_1:
+    case AST2700_SCUIO_CLK_STOP_CLR_2:
+        s->regs[reg - 1] ^= data;
+        updated = true;
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Unhandled write at offset 0x%" HWADDR_PRIx "\n",
+                      __func__, offset);
+        break;
+    }
+
+    if (!updated) {
+        s->regs[reg] = data;
+    }
+}
+
+static const MemoryRegionOps aspeed_ast2700_scuio_ops = {
+    .read = aspeed_ast2700_scuio_read,
+    .write = aspeed_ast2700_scuio_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid.min_access_size = 1,
+    .valid.max_access_size = 8,
+    .valid.unaligned = false,
+};
+
+static const uint32_t ast2700_a0_resets_io[ASPEED_AST2700_SCU_NR_REGS] = {
+    [AST2700_SILICON_REV]               = 0x06000003,
+    [AST2700_HW_STRAP1]                 = 0x00000504,
+    [AST2700_HW_STRAP1_CLR]             = 0xFFF0FFF0,
+    [AST2700_HW_STRAP1_LOCK]            = 0x00000FFF,
+    [AST2700_HW_STRAP1_SEC1]            = 0x000000FF,
+    [AST2700_HW_STRAP1_SEC2]            = 0x00000000,
+    [AST2700_HW_STRAP1_SEC3]            = 0x1000408F,
+    [AST2700_SCUIO_CLK_STOP_CTL_1]      = 0xffff8400,
+    [AST2700_SCUIO_CLK_STOP_CTL_2]      = 0x00005f30,
+    [AST2700_SCUIO_CLK_SEL_1]           = 0x86900000,
+    [AST2700_SCUIO_CLK_SEL_2]           = 0x00400000,
+    [AST2700_SCUIO_HPLL_PARAM]          = 0x10000027,
+    [AST2700_SCUIO_HPLL_EXT_PARAM]      = 0x80000014,
+    [AST2700_SCUIO_APLL_PARAM]          = 0x1000001f,
+    [AST2700_SCUIO_APLL_EXT_PARAM]      = 0x8000000f,
+    [AST2700_SCUIO_DPLL_PARAM]          = 0x106e42ce,
+    [AST2700_SCUIO_DPLL_EXT_PARAM]      = 0x80000167,
+    [AST2700_SCUIO_DPLL_PARAM_READ]     = 0x106e42ce,
+    [AST2700_SCUIO_DPLL_EXT_PARAM_READ] = 0x80000167,
+    [AST2700_SCUIO_UARTCLK_GEN]         = 0x00014506,
+    [AST2700_SCUIO_HUARTCLK_GEN]        = 0x000145c0,
+    [AST2700_SCUIO_CLK_DUTY_MEAS_RST]   = 0x0c9100d2,
+};
+
+static void aspeed_2700_scuio_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedSCUClass *asc = ASPEED_SCU_CLASS(klass);
+
+    dc->desc = "ASPEED 2700 System Control Unit I/O";
+    dc->reset = aspeed_ast2700_scu_reset;
+    asc->resets = ast2700_a0_resets_io;
+    asc->calc_hpll = aspeed_2600_scu_calc_hpll;
+    asc->get_apb = aspeed_2700_scuio_get_apb_freq;
+    asc->apb_divider = 2;
+    asc->nr_regs = ASPEED_AST2700_SCU_NR_REGS;
+    asc->clkin_25Mhz = true;
+    asc->ops = &aspeed_ast2700_scuio_ops;
+}
+
+static const TypeInfo aspeed_2700_scu_info = {
+    .name = TYPE_ASPEED_2700_SCU,
+    .parent = TYPE_ASPEED_SCU,
+    .instance_size = sizeof(AspeedSCUState),
+    .class_init = aspeed_2700_scu_class_init,
+};
+
+static const TypeInfo aspeed_2700_scuio_info = {
+    .name = TYPE_ASPEED_2700_SCUIO,
+    .parent = TYPE_ASPEED_SCU,
+    .instance_size = sizeof(AspeedSCUState),
+    .class_init = aspeed_2700_scuio_class_init,
+};
+
 static const uint32_t ast1030_a1_resets[ASPEED_AST2600_SCU_NR_REGS] = {
     [AST2600_SYS_RST_CTRL]      = 0xFFC3FED8,
     [AST2600_SYS_RST_CTRL2]     = 0x09FFFFFC,
@@ -841,6 +1143,8 @@ static void aspeed_scu_register_types(void)
     type_register_static(&aspeed_2500_scu_info);
     type_register_static(&aspeed_2600_scu_info);
     type_register_static(&aspeed_1030_scu_info);
+    type_register_static(&aspeed_2700_scu_info);
+    type_register_static(&aspeed_2700_scuio_info);
 }
 
 type_init(aspeed_scu_register_types);
diff --git a/hw/misc/trace-events b/hw/misc/trace-events
index e13b648..1be0717 100644
--- a/hw/misc/trace-events
+++ b/hw/misc/trace-events
@@ -93,6 +93,10 @@ slavio_led_mem_readw(uint32_t ret) "Read diagnostic LED 0x%04x"
 # aspeed_scu.c
 aspeed_scu_write(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
 aspeed_scu_read(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
+aspeed_ast2700_scu_write(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
+aspeed_ast2700_scu_read(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
+aspeed_ast2700_scuio_write(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
+aspeed_ast2700_scuio_read(uint64_t offset, unsigned size, uint32_t data) "To 0x%" PRIx64 " of size %u: 0x%" PRIx32
 
 # mps2-scc.c
 mps2_scc_read(uint64_t offset, uint64_t data, unsigned size) "MPS2 SCC read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
diff --git a/include/hw/misc/aspeed_scu.h b/include/hw/misc/aspeed_scu.h
index 7cb6018..58db28d 100644
--- a/include/hw/misc/aspeed_scu.h
+++ b/include/hw/misc/aspeed_scu.h
@@ -19,10 +19,13 @@ OBJECT_DECLARE_TYPE(AspeedSCUState, AspeedSCUClass, ASPEED_SCU)
 #define TYPE_ASPEED_2400_SCU TYPE_ASPEED_SCU "-ast2400"
 #define TYPE_ASPEED_2500_SCU TYPE_ASPEED_SCU "-ast2500"
 #define TYPE_ASPEED_2600_SCU TYPE_ASPEED_SCU "-ast2600"
+#define TYPE_ASPEED_2700_SCU TYPE_ASPEED_SCU "-ast2700"
+#define TYPE_ASPEED_2700_SCUIO TYPE_ASPEED_SCU "io" "-ast2700"
 #define TYPE_ASPEED_1030_SCU TYPE_ASPEED_SCU "-ast1030"
 
 #define ASPEED_SCU_NR_REGS (0x1A8 >> 2)
 #define ASPEED_AST2600_SCU_NR_REGS (0xE20 >> 2)
+#define ASPEED_AST2700_SCU_NR_REGS (0xE20 >> 2)
 
 struct AspeedSCUState {
     /*< private >*/
@@ -31,7 +34,7 @@ struct AspeedSCUState {
     /*< public >*/
     MemoryRegion iomem;
 
-    uint32_t regs[ASPEED_AST2600_SCU_NR_REGS];
+    uint32_t regs[ASPEED_AST2700_SCU_NR_REGS];
     uint32_t silicon_rev;
     uint32_t hw_strap1;
     uint32_t hw_strap2;
@@ -48,6 +51,9 @@ struct AspeedSCUState {
 #define AST2600_A3_SILICON_REV   0x05030303U
 #define AST1030_A0_SILICON_REV   0x80000000U
 #define AST1030_A1_SILICON_REV   0x80010000U
+#define AST2700_A0_SILICON_REV   0x06000103U
+#define AST2720_A0_SILICON_REV   0x06000203U
+#define AST2750_A0_SILICON_REV   0x06000003U
 
 #define ASPEED_IS_AST2500(si_rev)     ((((si_rev) >> 24) & 0xff) == 0x04)
 
@@ -87,7 +93,8 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
  *       1. 2012/12/29 Ryan Chen Create
  */
 
-/* SCU08   Clock Selection Register
+/*
+ * SCU08   Clock Selection Register
  *
  *  31     Enable Video Engine clock dynamic slow down
  *  30:28  Video Engine clock slow down setting
@@ -109,7 +116,8 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
  */
 #define SCU_CLK_GET_PCLK_DIV(x)                    (((x) >> 23) & 0x7)
 
-/* SCU24   H-PLL Parameter Register (for Aspeed AST2400 SOC)
+/*
+ * SCU24   H-PLL Parameter Register (for Aspeed AST2400 SOC)
  *
  *  18     H-PLL parameter selection
  *           0: Select H-PLL by strapping resistors
@@ -127,7 +135,8 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
 #define SCU_AST2400_H_PLL_BYPASS_EN                (0x1 << 17)
 #define SCU_AST2400_H_PLL_OFF                      (0x1 << 16)
 
-/* SCU24   H-PLL Parameter Register (for Aspeed AST2500 SOC)
+/*
+ * SCU24   H-PLL Parameter Register (for Aspeed AST2500 SOC)
  *
  *  21     Enable H-PLL reset
  *  20     Enable H-PLL bypass mode
@@ -144,7 +153,8 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
 #define SCU_H_PLL_BYPASS_EN                        (0x1 << 20)
 #define SCU_H_PLL_OFF                              (0x1 << 19)
 
-/* SCU70  Hardware Strapping Register definition (for Aspeed AST2400 SOC)
+/*
+ * SCU70  Hardware Strapping Register definition (for Aspeed AST2400 SOC)
  *
  * 31:29  Software defined strapping registers
  * 28:27  DRAM size setting (for VGA driver use)
@@ -361,4 +371,31 @@ uint32_t aspeed_scu_get_apb_freq(AspeedSCUState *s);
  */
 #define SCU_AST1030_CLK_GET_PCLK_DIV(x)                    (((x) >> 8) & 0xf)
 
+/*
+ * SCU280   Clock Selection 1 Register (for Aspeed AST2700 SCUIO)
+ *
+ *  31:29  MHCLK_DIV
+ *  28     Reserved
+ *  27:25  RGMIICLK_DIV
+ *  24     Reserved
+ *  23:21  RMIICLK_DIV
+ *  20:18  PCLK_DIV
+ *  17:14  SDCLK_DIV
+ *  13     SDCLK_SEL
+ *  12     UART13CLK_SEL
+ *  11     UART12CLK_SEL
+ *  10     UART11CLK_SEL
+ *  9      UART10CLK_SEL
+ *  8      UART9CLK_SEL
+ *  7      UART8CLK_SEL
+ *  6      UART7CLK_SEL
+ *  5      UART6CLK_SEL
+ *  4      UARTDBCLK_SEL
+ *  3      UART4CLK_SEL
+ *  2      UART3CLK_SEL
+ *  1      UART2CLK_SEL
+ *  0      UART1CLK_SEL
+ */
+#define SCUIO_AST2700_CLK_GET_PCLK_DIV(x)                    (((x) >> 18) & 0x7)
+
 #endif /* ASPEED_SCU_H */