soc/common/smbus: Support reading SPD5 hubs for DDR5

DDR5 uses a Serial Presence Detect (SPD) with hub function
(SPD5 hub device) to store the SPD data. The SPD5 hub has 1024 bytes of
EEPROM (`CONFIG_DIMM_SPD_SIZE=1024`).

Tested on Clevo V560TU (system76/darp10) with 2x Crucial CT16G48C40S5
DIMMs.

Change-Id: Ic5e6c58f255bef86b68ce90a4f853bf4e7c7ccfe
Co-authored-by: Meera Ravindranath <meera.ravindranath@intel.com>
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>

src/include/spd_bin.h

@@ -36,6 +36,18 @@
 #define DDR4_SPD_PART_OFF	329
 #define DDR4_SPD_PART_LEN	20
 #define DDR4_SPD_SN_OFF		325
+#define MAX_SPD_PAGE_SIZE_SPD5	128
+#define MAX_SPD_SIZE		(SPD_PAGE_LEN * 4)
+#define SPD_HUB_MEMREG(addr)	((u8)(0x80 | (addr)))
+#define SPD5_MR11		0x0B
+#define SPD5_MR0		0x00
+#define SPD5_MEMREG_REG(addr)	((u8)((~0x80) & (addr)))
+#define SPD5_MR0_SPD5_HUB_DEV	0x51
+
+struct spd_offset_table {
+	u16 start;		/* Offset 0 */
+	u16 end;		/* Offset 2 */
+};
 
 struct spd_block {
 	u8 addr_map[CONFIG_DIMM_MAX]; /* 7 bit I2C addresses */

src/lib/spd_cache.c

@@ -209,7 +209,9 @@ enum cb_err spd_fill_from_cache(uint8_t *spd_cache, struct spd_block *blk)
 
 	dram_type = *(spd_cache + SC_SPD_OFFSET(i) + SPD_DRAM_TYPE);
 
-	if (dram_type == SPD_DRAM_DDR4)
+	if (dram_type == SPD_DRAM_DDR5)
+		blk->len = CONFIG_DIMM_SPD_SIZE;
+	else if (dram_type == SPD_DRAM_DDR4)
 		blk->len = SPD_PAGE_LEN_DDR4;
 	else
 		blk->len = SPD_PAGE_LEN;

src/soc/intel/common/block/crashlog/crashlog.c

@@ -112,7 +112,7 @@ int cpu_cl_poll_mailbox_ready(u32 cl_mailbox_addr)
 	u16 stall_cnt = 0;
 
 	do {
-		cl_mailbox_interface.data = read32((u32 *)cl_mailbox_addr);
+		cl_mailbox_interface.data = read32((u32 *)(uintptr_t)cl_mailbox_addr);
 		udelay(CPU_CRASHLOG_WAIT_STALL);
 		stall_cnt++;
 	} while ((cl_mailbox_interface.fields.busy == 1)
@@ -140,7 +140,7 @@ int cpu_cl_mailbox_cmd(u8 cmd, u8 param)
 	cl_mailbox_intf.fields.param = param;
 	cl_mailbox_intf.fields.busy = 1;
 
-	write32((u32 *)(cl_base_addr + cl_get_cpu_mb_int_addr()),
+	write32((u32 *)(uintptr_t)(cl_base_addr + cl_get_cpu_mb_int_addr()),
 		cl_mailbox_intf.data);
 
 	cpu_cl_poll_mailbox_ready(cl_base_addr + cl_get_cpu_mb_int_addr());
@@ -167,7 +167,7 @@ int pmc_cl_gen_descriptor_table(u32 desc_table_addr,
 				pmc_crashlog_desc_table_t *descriptor_table)
 {
 	int total_data_size = 0;
-	descriptor_table->numb_regions = read32((u32 *)desc_table_addr);
+	descriptor_table->numb_regions = read32((u32 *)(uintptr_t)desc_table_addr);
 	printk(BIOS_DEBUG, "CL PMC desc table: numb of regions is 0x%x at addr 0x%x\n",
 	       descriptor_table->numb_regions, desc_table_addr);
 	for (int i = 0; i < descriptor_table->numb_regions; i++) {
@@ -178,7 +178,7 @@ int pmc_cl_gen_descriptor_table(u32 desc_table_addr,
 			break;
 		}
 		desc_table_addr += 4;
-		descriptor_table->regions[i].data = read32((u32 *)(desc_table_addr));
+		descriptor_table->regions[i].data = read32((u32 *)(uintptr_t)(desc_table_addr));
 		total_data_size += descriptor_table->regions[i].bits.size * sizeof(u32);
 		printk(BIOS_DEBUG, "CL PMC desc table: region 0x%x has size 0x%x at offset 0x%x\n",
 			i, descriptor_table->regions[i].bits.size,
@@ -295,7 +295,7 @@ bool cl_copy_data_from_sram(u32 src_bar,
 
 	u32 src_addr = src_bar + offset;
 
-	u32 data =  read32((u32 *)src_addr);
+	u32 data =  read32((u32 *)(uintptr_t)src_addr);
 
 	/* First 32bits of the record must not be 0xdeadbeef */
 	if (data == INVALID_CRASHLOG_RECORD) {
@@ -320,7 +320,7 @@ bool cl_copy_data_from_sram(u32 src_bar,
 	u32 copied = 0;
 	while (copied < size) {
 		/* DW by DW copy: byte access to PMC SRAM not allowed */
-		*dest_addr = read32((u32 *)src_addr);
+		*dest_addr = read32((u32 *)(uintptr_t)src_addr);
 		dest_addr++;
 		src_addr += 4;
 		copied++;

src/soc/intel/common/block/smbus/smbuslib.c

@@ -13,8 +13,11 @@ static void update_spd_len(struct spd_block *blk)
 		if (blk->spd_array[i] != NULL)
 			j |= blk->spd_array[i][SPD_DRAM_TYPE];
 
+	/* If spd used is DDR5, then its length is 1024 byte. */
+	if (j == SPD_DRAM_DDR5)
+		blk->len = CONFIG_DIMM_SPD_SIZE;
 	/* If spd used is DDR4, then its length is 512 byte. */
-	if (j == SPD_DRAM_DDR4)
+	else if (j == SPD_DRAM_DDR4)
 		blk->len = SPD_PAGE_LEN_DDR4;
 	else
 		blk->len = SPD_PAGE_LEN;
@@ -37,6 +40,61 @@ static void smbus_read_spd(u8 *spd, u8 addr)
 	}
 }
 
+static void switch_page(u8 spd_addr, u8 new_page)
+{
+	u32 offset;
+	/*
+	 *  By default,an SPD5 hub accepts 1 byte addressing pointing
+	 *  to the first 128 bytes of memory. MR11[2:0] selects the page
+	 *  pointer to address the entire 1024 bytes of non-volatile memory.
+	 */
+	offset = SPD5_MEMREG_REG(SPD5_MR11);
+	smbus_write_byte(spd_addr, offset, new_page);
+}
+
+/*
+ * Read the SPD data over the SMBus, at the specified SPD address,
+ * starting at the specified starting offset and read the given amount of data.
+ */
+static void smbus_read_spd5(u8 *spd, u8 spd_addr, u16 size)
+{
+	u8 page = ~0;
+	u32 max_page_size = MAX_SPD_PAGE_SIZE_SPD5;
+
+	if (size > MAX_SPD_SIZE) {
+		printk(BIOS_ERR, "Maximum SPD size reached\n");
+		return;
+	}
+	for (int i = 0; i < size; i++) {
+		u8 next_page = (u8) (i / max_page_size);
+		if (next_page != page) {
+			switch_page(spd_addr, next_page);
+			page = next_page;
+		}
+		unsigned int byte_addr = SPD_HUB_MEMREG(i % max_page_size);
+		spd[i] = smbus_read_byte(spd_addr, byte_addr);
+	}
+}
+
+/* Read SPD5 MR0 and check if SPD Byte 0 matches the SPD5 HUB MR0 identifier.*/
+static int is_spd5_hub(u8 spd_addr)
+{
+	u8 spd_hub_byte;
+
+	spd_hub_byte = smbus_read_byte(spd_addr, SPD5_MEMREG_REG(SPD5_MR0));
+	return spd_hub_byte == SPD5_MR0_SPD5_HUB_DEV;
+}
+
+/*
+ * Reset the SPD page back to page 0 on an SPD5 Hub device at the
+ * input SPD SMbus address.
+ */
+static void reset_page_spd5(u8 spd_addr)
+{
+	/* Set SPD5 MR11[2:0] = 0 (Page 0) */
+	smbus_write_byte(spd_addr, SPD5_MEMREG_REG(SPD5_MR11), 0);
+}
+
 /* return -1 if SMBus errors otherwise return 0 */
 static int get_spd(u8 *spd, u8 addr)
 {
@@ -52,22 +110,31 @@ static int get_spd(u8 *spd, u8 addr)
 		return -1;
 	}
 
-	if (i2c_eeprom_read(addr, 0, SPD_PAGE_LEN, spd) < 0) {
-		printk(BIOS_INFO, "do_i2c_eeprom_read failed, using fallback\n");
-		smbus_read_spd(spd, addr);
-	}
+	if (is_spd5_hub(addr)) {
+		smbus_read_spd5(spd, addr, CONFIG_DIMM_SPD_SIZE);
 
-	/* Check if module is DDR4, DDR4 spd is 512 byte. */
-	if (spd[SPD_DRAM_TYPE] == SPD_DRAM_DDR4 && CONFIG_DIMM_SPD_SIZE > SPD_PAGE_LEN) {
-		/* Switch to page 1 */
-		smbus_write_byte(SPD_PAGE_1, 0, 0);
+		/* Reset the page for the next loop iteration */
+		reset_page_spd5(addr);
+	} else {
 
-		if (i2c_eeprom_read(addr, 0, SPD_PAGE_LEN, spd + SPD_PAGE_LEN) < 0) {
+		if (i2c_eeprom_read(addr, 0, SPD_PAGE_LEN, spd) < 0) {
 			printk(BIOS_INFO, "do_i2c_eeprom_read failed, using fallback\n");
-			smbus_read_spd(spd + SPD_PAGE_LEN, addr);
+			smbus_read_spd(spd, addr);
+		}
+
+		/* Check if module is DDR4, DDR4 spd is 512 byte. */
+		if (spd[SPD_DRAM_TYPE] == SPD_DRAM_DDR4 &&
+					CONFIG_DIMM_SPD_SIZE > SPD_PAGE_LEN) {
+			/* Switch to page 1 */
+			smbus_write_byte(SPD_PAGE_1, 0, 0);
+
+			if (i2c_eeprom_read(addr, 0, SPD_PAGE_LEN, spd + SPD_PAGE_LEN) < 0) {
+				printk(BIOS_INFO, "do_i2c_eeprom_read failed, using fallback\n");
+				smbus_read_spd(spd + SPD_PAGE_LEN, addr);
+			}
+			/* Restore to page 0 */
+			smbus_write_byte(SPD_PAGE_0, 0, 0);
 		}
-		/* Restore to page 0 */
-		smbus_write_byte(SPD_PAGE_0, 0, 0);
 	}
 	return 0;
 }

src/soc/intel/meteorlake/crashlog.c

@@ -34,7 +34,7 @@ static u32 disc_tab_addr;
 
 static u64 get_disc_tab_header(void)
 {
-	return read64((void *)disc_tab_addr);
+	return read64((void *)(uintptr_t)disc_tab_addr);
 }
 
 /* Get the SRAM BAR. */
@@ -338,7 +338,7 @@ static bool cpu_cl_gen_discovery_table(void)
 
 	disc_tab_addr = bar_addr + get_disc_table_offset();
 
-	u32 dw0 = read32((u32 *)disc_tab_addr);
+	u32 dw0 = read32((u32 *)(uintptr_t)disc_tab_addr);
 	if (!is_crashlog_data_valid(dw0))
 		return false;
 
@@ -351,7 +351,7 @@ static bool cpu_cl_gen_discovery_table(void)
 	for (int i = 0; i < cpu_cl_disc_tab.header.fields.count; i++) {
 		cur_offset = 8 + 24 * i;
 
-		dw0 = read32((u32 *)disc_tab_addr + cur_offset);
+		dw0 = read32((u32 *)(uintptr_t)disc_tab_addr + cur_offset);
 		if (!is_crashlog_data_valid(dw0))
 			continue;
 
@@ -361,7 +361,7 @@ static bool cpu_cl_gen_discovery_table(void)
 			break;
 		}
 
-		cpu_cl_disc_tab.buffers[i].data = read64((void *)(disc_tab_addr + cur_offset));
+		cpu_cl_disc_tab.buffers[i].data = read64((void *)(uintptr_t)(disc_tab_addr + cur_offset));
 		printk(BIOS_DEBUG, "cpu_crashlog_discovery_table buffer: 0x%x size: "
 			"0x%x offset: 0x%x\n", i,  cpu_cl_disc_tab.buffers[i].fields.size,
 			cpu_cl_disc_tab.buffers[i].fields.offset);
@@ -450,7 +450,7 @@ void cpu_cl_rearm(void)
 	cl_punit_control_interface_t punit_ctrl_intfc;
 	memset(&punit_ctrl_intfc, 0, sizeof(cl_punit_control_interface_t));
 	punit_ctrl_intfc.fields.set_re_arm = 1;
-	write32((u32 *)(ctrl_sts_intfc_addr), punit_ctrl_intfc.data);
+	write32((u32 *)(uintptr_t)(ctrl_sts_intfc_addr), punit_ctrl_intfc.data);
 
 	if (!wait_and_check(CRASHLOG_RE_ARM_STATUS_MASK))
 		printk(BIOS_ERR, "CPU crashlog re_arm not asserted\n");
@@ -480,7 +480,7 @@ void cpu_cl_cleanup(void)
 	cl_punit_control_interface_t punit_ctrl_intfc;
 	memset(&punit_ctrl_intfc, 0, sizeof(cl_punit_control_interface_t));
 	punit_ctrl_intfc.fields.set_storage_off = 1;
-	write32((u32 *)(ctrl_sts_intfc_addr), punit_ctrl_intfc.data);
+	write32((u32 *)(uintptr_t)(ctrl_sts_intfc_addr), punit_ctrl_intfc.data);
 
 	if (!wait_and_check(CRASHLOG_PUNIT_STORAGE_OFF_MASK))
 		printk(BIOS_ERR, "CPU crashlog storage_off not asserted\n");