mediatek: Refactor to sharing code among similar SOCs

This patch refactor cbmem and timer code which will be reused among
similar SOCs.

BUG=b:80501386
BRANCH=none
TEST=the refactored code works fine on the new platform (with the rest
     of the patches applied) and Elm platform

Change-Id: I397ebdc0c97c7616bd547022d2ce2a8f08f3c232
Signed-off-by: Tristan Shieh <tristan.shieh@mediatek.com>
Reviewed-on: https://review.coreboot.org/26881
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/mt8173/Makefile.inc

@@ -20,6 +20,7 @@ bootblock-$(CONFIG_SPI_FLASH) += flash_controller.c
 bootblock-y += i2c.c
 bootblock-y += pll.c
 bootblock-y += spi.c
+bootblock-y += common_timer.c
 bootblock-y += timer.c
 
 ifeq ($(CONFIG_BOOTBLOCK_CONSOLE),y)
@@ -37,6 +38,7 @@ verstage-y += spi.c
 
 verstage-$(CONFIG_DRIVERS_UART) += uart.c
 
+verstage-y += common_timer.c
 verstage-y += timer.c
 verstage-y += wdt.c
 verstage-$(CONFIG_SPI_FLASH) += flash_controller.c
@@ -46,6 +48,7 @@ verstage-y += gpio.c
 
 romstage-$(CONFIG_SPI_FLASH) += flash_controller.c
 romstage-y += pll.c
+romstage-y += common_timer.c
 romstage-y += timer.c
 
 romstage-$(CONFIG_DRIVERS_UART) += uart.c
@@ -64,6 +67,7 @@ ramstage-y += cbmem.c emi.c
 ramstage-y += spi.c
 ramstage-$(CONFIG_SPI_FLASH) += flash_controller.c
 ramstage-y += soc.c mtcmos.c
+ramstage-y += common_timer.c
 ramstage-y += timer.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 ramstage-y += pmic_wrap.c mt6391.c i2c.c

src/soc/mediatek/mt8173/cbmem.c

@@ -19,7 +19,9 @@
 #include <symbols.h>
 #include <soc/emi.h>
 
+#define MAX_DRAM_ADDRESS ((uintptr_t)4 * GiB)
+
 void *cbmem_top(void)
 {
-	return (void *)min((uintptr_t)_dram + sdram_size(), (uintptr_t)4 * GiB);
+	return (void *)min((uintptr_t)_dram + sdram_size(), MAX_DRAM_ADDRESS);
 }

src/soc/mediatek/mt8173/common_timer.c

@@ -0,0 +1,47 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <compiler.h>
+#include <console/console.h>
+#include <timer.h>
+#include <delay.h>
+#include <thread.h>
+
+#include <soc/addressmap.h>
+#include <soc/timer.h>
+
+static struct mtk_gpt_regs *const mtk_gpt = (void *)GPT_BASE;
+
+__weak void timer_prepare(void) { /* do nothing */ }
+
+void timer_monotonic_get(struct mono_time *mt)
+{
+	mono_time_set_usecs(mt, read32(&mtk_gpt->gpt4_cnt) / GPT4_MHZ);
+}
+
+void init_timer(void)
+{
+	timer_prepare();
+
+	/* Disable GPT4 and clear the counter */
+	clrbits_le32(&mtk_gpt->gpt4_con, GPT_CON_EN);
+	setbits_le32(&mtk_gpt->gpt4_con, GPT_CON_CLR);
+
+	/* Set clock source to system clock and set clock divider to 1 */
+	write32(&mtk_gpt->gpt4_clk, GPT_SYS_CLK | GPT_CLK_DIV1);
+	/* Set operation mode to FREERUN mode and enable GTP4 */
+	write32(&mtk_gpt->gpt4_con, GPT_CON_EN | GPT_MODE_FREERUN);
+}

src/soc/mediatek/mt8173/include/soc/timer.h

@@ -13,59 +13,38 @@
  * GNU General Public License for more details.
  */
 
-#ifndef __SOC_MEDIATEK_MT8173_TIMER_H__
-#define __SOC_MEDIATEK_MT8173_TIMER_H__
+#ifndef SOC_MEDIATEK_COMMON_TIMER_H
+#define SOC_MEDIATEK_COMMON_TIMER_H
 
 #include <soc/addressmap.h>
 #include <types.h>
 
-struct mt8173_gpt_regs {
-	u32 irqen;
-	u32 irqsta;
-	u32 irqack;
-	u32 reserved0;
-	u32 gpt1_con;
-	u32 gpt1_clk;
-	u32 gpt1_cnt;
-	u32 gpt1_compare;
-	u32 gpt2_con;
-	u32 gpt2_clk;
-	u32 gpt2_cnt;
-	u32 gpt2_compare;
-	u32 gpt3_con;
-	u32 gpt3_clk;
-	u32 gpt3_cnt;
-	u32 gpt3_compare;
+#define GPT4_MHZ	13
+
+struct mtk_gpt_regs {
+	u32 reserved[16];
 	u32 gpt4_con;
 	u32 gpt4_clk;
 	u32 gpt4_cnt;
-	u32 gpt4_compare;
-	u32 gpt5_con;
-	u32 gpt5_clk;
-	u32 gpt5_cnt;
-	u32 gpt5_compare;
-	u32 gpt6_con;
-	u32 gpt6_clk;
-	u32 gpt6_cntl;
-	u32 gpt6_comparel;
-	u32 reserved1[2];
-	u32 gpt6_cnth;
-	u32 gpt6_compareh;
-	u32 apxgpt_irqmask;
-	u32 apxgpt_irqmask1;
 };
 
-static struct mt8173_gpt_regs *const mt8173_gpt = (void *)GPT_BASE;
+check_member(mtk_gpt_regs, gpt4_con, 0x0040);
+check_member(mtk_gpt_regs, gpt4_clk, 0x0044);
+check_member(mtk_gpt_regs, gpt4_cnt, 0x0048);
 
 enum {
 	GPT_CON_EN        = 0x01,
 	GPT_CON_CLR       = 0x02,
-	GPT_MODE_ONE_SHOT = 0x00,
-	GPT_MODE_REPEAT   = 0x10,
-	GPT_MODE_KEEP_GO  = 0x20,
 	GPT_MODE_FREERUN  = 0x30,
 	GPT_SYS_CLK       = 0x00,
-	GPT_SYS_RTC = 0x01,
+	GPT_CLK_DIV1      = 0x00,
 };
 
-#endif	/* __SOC_MEDIATEK_MT8173_TIMER_H__ */
+/*
+ * This is defined as weak no-ops that can be overridden by legacy SOCs. Some
+ * legacy SOCs need specific settings before init timer. And we expect future
+ * SOCs will not need it.
+ */
+void timer_prepare(void);
+
+#endif

src/soc/mediatek/mt8173/timer.c

@@ -14,26 +14,10 @@
  */
 
 #include <arch/io.h>
-#include <console/console.h>
-#include <timer.h>
-#include <delay.h>
-#include <thread.h>
-
-#include <soc/addressmap.h>
 #include <soc/mcucfg.h>
 #include <soc/timer.h>
 
-#define GPT4_MHZ	13
-
-void timer_monotonic_get(struct mono_time *mt)
-{
-        mono_time_set_usecs(mt, read32(&mt8173_gpt->gpt4_cnt) / GPT4_MHZ);
-}
-
-/**
- * init_timer - initialize timer
- */
-void init_timer(void)
+void timer_prepare(void)
 {
 	/* Set XGPT_IDX to 0, then the bit field of XGPT_CTL will be programmed
 	 * with following definition.
@@ -48,13 +32,4 @@ void init_timer(void)
 	write32(&mt8173_mcucfg->xgpt_idx, 0);
 	/* Set clock mode to 13Mhz and enable XGPT */
 	write32(&mt8173_mcucfg->xgpt_ctl, (0x1 | ((26 / GPT4_MHZ) << 8)));
-
-	/* Disable GPT4 and clear the counter */
-	clrbits_le32(&mt8173_gpt->gpt4_con, GPT_CON_EN);
-	setbits_le32(&mt8173_gpt->gpt4_con, GPT_CON_CLR);
-
-	/* Set clock source to system clock and set clock divider to 1 */
-	write32(&mt8173_gpt->gpt4_clk, GPT_SYS_CLK | 0x0);
-	/* Set operation mode to FREERUN mode and enable GTP4 */
-	write32(&mt8173_gpt->gpt4_con, GPT_CON_EN | GPT_MODE_FREERUN);
 }