aspeed/sdmc: Add AST2600 support

The AST2600 SDMC controller is slightly different from its predecessor
(DRAM training). Max memory is now 2G on the AST2600.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20190925143248.10000-10-clg@kaod.org
[clg: - improved commit log
      - reworked model integration into new object class ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 84 insertions, 0 deletions

diff --git a/hw/misc/aspeed_scu.c b/hw/misc/aspeed_scu.c
index 84699b7..717509b 100644
--- a/hw/misc/aspeed_scu.c
+++ b/hw/misc/aspeed_scu.c
@@ -99,6 +99,7 @@
 #define AST2600_CLK_STOP_CTRL_CLR TO_REG(0x84)
 #define AST2600_CLK_STOP_CTRL2     TO_REG(0x90)
 #define AST2600_CLK_STOP_CTR2L_CLR TO_REG(0x94)
+#define AST2600_SDRAM_HANDSHAKE   TO_REG(0x100)
 #define AST2600_HPLL_PARAM        TO_REG(0x200)
 #define AST2600_HPLL_EXT          TO_REG(0x204)
 #define AST2600_MPLL_EXT          TO_REG(0x224)
@@ -602,6 +603,7 @@ static const uint32_t ast2600_a0_resets[ASPEED_AST2600_SCU_NR_REGS] = {
     [AST2600_SYS_RST_CTRL2]     = 0xFFFFFFFC,
     [AST2600_CLK_STOP_CTRL]     = 0xEFF43E8B,
     [AST2600_CLK_STOP_CTRL2]    = 0xFFF0FFF0,
+    [AST2600_SDRAM_HANDSHAKE]   = 0x00000040,  /* SoC completed DRAM init */
     [AST2600_HPLL_PARAM]        = 0x1000405F,
 };
 
diff --git a/hw/misc/aspeed_sdmc.c b/hw/misc/aspeed_sdmc.c
index 60c99e7..f3a63a2 100644
--- a/hw/misc/aspeed_sdmc.c
+++ b/hw/misc/aspeed_sdmc.c
@@ -28,6 +28,7 @@
 /* Control/Status Register #1 (ast2500) */
 #define R_STATUS1         (0x60 / 4)
 #define   PHY_BUSY_STATE      BIT(0)
+#define   PHY_PLL_LOCK_STATUS BIT(4)
 
 #define R_ECC_TEST_CTRL   (0x70 / 4)
 #define   ECC_TEST_FINISHED   BIT(12)
@@ -85,6 +86,11 @@
 #define     ASPEED_SDMC_AST2500_512MB       0x2
 #define     ASPEED_SDMC_AST2500_1024MB      0x3
 
+#define     ASPEED_SDMC_AST2600_256MB       0x0
+#define     ASPEED_SDMC_AST2600_512MB       0x1
+#define     ASPEED_SDMC_AST2600_1024MB      0x2
+#define     ASPEED_SDMC_AST2600_2048MB      0x3
+
 #define ASPEED_SDMC_AST2500_READONLY_MASK                               \
     (ASPEED_SDMC_HW_VERSION(0xf) | ASPEED_SDMC_CACHE_INITIAL_DONE |     \
      ASPEED_SDMC_AST2500_RESERVED | ASPEED_SDMC_VGA_COMPAT |            \
@@ -186,6 +192,28 @@ static int ast2500_rambits(AspeedSDMCState *s)
     return ASPEED_SDMC_AST2500_512MB;
 }
 
+static int ast2600_rambits(AspeedSDMCState *s)
+{
+    switch (s->ram_size >> 20) {
+    case 256:
+        return ASPEED_SDMC_AST2600_256MB;
+    case 512:
+        return ASPEED_SDMC_AST2600_512MB;
+    case 1024:
+        return ASPEED_SDMC_AST2600_1024MB;
+    case 2048:
+        return ASPEED_SDMC_AST2600_2048MB;
+    default:
+        break;
+    }
+
+    /* use a common default */
+    warn_report("Invalid RAM size 0x%" PRIx64 ". Using default 512M",
+                s->ram_size);
+    s->ram_size = 512 << 20;
+    return ASPEED_SDMC_AST2600_512MB;
+}
+
 static void aspeed_sdmc_reset(DeviceState *dev)
 {
     AspeedSDMCState *s = ASPEED_SDMC(dev);
@@ -340,11 +368,65 @@ static const TypeInfo aspeed_2500_sdmc_info = {
     .class_init = aspeed_2500_sdmc_class_init,
 };
 
+static uint32_t aspeed_2600_sdmc_compute_conf(AspeedSDMCState *s, uint32_t data)
+{
+    uint32_t fixed_conf = ASPEED_SDMC_HW_VERSION(3) |
+        ASPEED_SDMC_VGA_APERTURE(ASPEED_SDMC_VGA_64MB) |
+        ASPEED_SDMC_DRAM_SIZE(ast2600_rambits(s));
+
+    /* Make sure readonly bits are kept (use ast2500 mask) */
+    data &= ~ASPEED_SDMC_AST2500_READONLY_MASK;
+
+    return data | fixed_conf;
+}
+
+static void aspeed_2600_sdmc_write(AspeedSDMCState *s, uint32_t reg,
+                                   uint32_t data)
+{
+    switch (reg) {
+    case R_CONF:
+        data = aspeed_2600_sdmc_compute_conf(s, data);
+        break;
+    case R_STATUS1:
+        /* Will never return 'busy'. 'lock status' is always set */
+        data &= ~PHY_BUSY_STATE;
+        data |= PHY_PLL_LOCK_STATUS;
+        break;
+    case R_ECC_TEST_CTRL:
+        /* Always done, always happy */
+        data |= ECC_TEST_FINISHED;
+        data &= ~ECC_TEST_FAIL;
+        break;
+    default:
+        break;
+    }
+
+    s->regs[reg] = data;
+}
+
+static void aspeed_2600_sdmc_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    AspeedSDMCClass *asc = ASPEED_SDMC_CLASS(klass);
+
+    dc->desc = "ASPEED 2600 SDRAM Memory Controller";
+    asc->max_ram_size = 2048 << 20;
+    asc->compute_conf = aspeed_2600_sdmc_compute_conf;
+    asc->write = aspeed_2600_sdmc_write;
+}
+
+static const TypeInfo aspeed_2600_sdmc_info = {
+    .name = TYPE_ASPEED_2600_SDMC,
+    .parent = TYPE_ASPEED_SDMC,
+    .class_init = aspeed_2600_sdmc_class_init,
+};
+
 static void aspeed_sdmc_register_types(void)
 {
     type_register_static(&aspeed_sdmc_info);
     type_register_static(&aspeed_2400_sdmc_info);
     type_register_static(&aspeed_2500_sdmc_info);
+    type_register_static(&aspeed_2600_sdmc_info);
 }
 
 type_init(aspeed_sdmc_register_types);