soc/amd/stoneyridge: Add UMA save function

Save the UMA values from AGESA to use in resource
allocation in ramstage.

Change-Id: I2a218160649d934f615b2637ff122c36b4ba617e
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: https://review.coreboot.org/23817
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/amd/stoneyridge/include/soc/iomap.h

@@ -68,5 +68,7 @@
 
 /* BiosRam Ranges at 0xfed80500 or I/O 0xcd4/0xcd5 */
 #define BIOSRAM_CBMEM_TOP		0xf0 /* 4 bytes */
+#define BIOSRAM_UMA_SIZE		0xf4 /* 4 bytes */
+#define BIOSRAM_UMA_BASE		0xf8 /* 8 bytes */
 
 #endif /* __SOC_STONEYRIDGE_IOMAP_H__ */

src/soc/amd/stoneyridge/include/soc/southbridge.h

@@ -339,6 +339,38 @@ uint16_t xhci_pm_read16(uint8_t reg);
 void xhci_pm_write32(uint8_t reg, uint32_t value);
 uint32_t xhci_pm_read32(uint8_t reg);
 void bootblock_fch_early_init(void);
+/**
+ * @brief Save the UMA bize returned by AGESA
+ *
+ * @param size = in bytes
+ *
+ * @return none
+ */
+void save_uma_size(uint32_t size);
+/**
+ * @brief Save the UMA base address returned by AGESA
+ *
+ * @param base = 64bit base address
+ *
+ * @return none
+ */
+void save_uma_base(uint64_t base);
+/**
+ * @brief Get the saved UMA size
+ *
+ * @param none
+ *
+ * @return size in bytes
+ */
+uint32_t get_uma_size(void);
+/**
+ * @brief Get the saved UMA base
+ *
+ * @param none
+ *
+ * @return 64bit base address
+ */
+uint64_t get_uma_base(void);
 /**
  * @brief program a particular set of GPIO
  *

src/soc/amd/stoneyridge/sb_util.c

@@ -164,3 +164,27 @@ int acpi_get_sleep_type(void)
 {
 	return acpi_sleep_from_pm1(inw(pm_acpi_pm_cnt_blk()));
 }
+
+void save_uma_size(uint32_t size)
+{
+	biosram_write32(BIOSRAM_UMA_SIZE, size);
+}
+
+void save_uma_base(uint64_t base)
+{
+	biosram_write32(BIOSRAM_UMA_BASE, (uint32_t) base);
+	biosram_write32(BIOSRAM_UMA_BASE + 4, (uint32_t) (base >> 32));
+}
+
+uint32_t get_uma_size(void)
+{
+	return biosram_read32(BIOSRAM_UMA_SIZE);
+}
+
+uint64_t get_uma_base(void)
+{
+	uint64_t base;
+	base = biosram_read32(BIOSRAM_UMA_BASE);
+	base |= ((uint64_t)(biosram_read32(BIOSRAM_UMA_BASE + 4)) << 32);
+	return base;
+}