mediatek/mt8183: Add SPI support

This patch implements SOC-specific code of mt8183 and link the common
code to support SPI bus.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui

Signed-off-by: mengqi.zhang <mengqi.zhang@mediatek.com>
Change-Id: I544e850299c74861313c2425721479fe5b91639e
Reviewed-on: https://review.coreboot.org/27498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/mediatek/mt8183/Makefile.inc

@@ -3,7 +3,7 @@ ifeq ($(CONFIG_SOC_MEDIATEK_MT8183),y)
 bootblock-y += bootblock.c
 bootblock-y += ../common/gpio.c gpio.c
 bootblock-y += ../common/pll.c pll.c
-bootblock-$(CONFIG_SPI_FLASH) += spi.c
+bootblock-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 bootblock-y += ../common/timer.c
 ifeq ($(CONFIG_BOOTBLOCK_CONSOLE),y)
 bootblock-$(CONFIG_DRIVERS_UART) += ../common/uart.c
@@ -15,7 +15,7 @@ decompressor-y += ../common/mmu_operations.c
 decompressor-y += ../common/timer.c
 
 verstage-y += ../common/gpio.c gpio.c
-verstage-$(CONFIG_SPI_FLASH) += spi.c
+verstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 verstage-y += ../common/timer.c
 verstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c
 verstage-y += ../common/wdt.c
@@ -23,7 +23,7 @@ verstage-y += ../common/wdt.c
 romstage-y += emi.c
 romstage-y += ../common/gpio.c gpio.c
 romstage-y += ../common/mmu_operations.c mmu_operations.c
-romstage-$(CONFIG_SPI_FLASH) += spi.c
+romstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 romstage-y += ../common/timer.c
 romstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c
 romstage-y += ../common/wdt.c
@@ -33,7 +33,7 @@ ramstage-y += ../common/gpio.c gpio.c
 ramstage-y += ../common/mmu_operations.c mmu_operations.c
 ramstage-y += ../common/mtcmos.c mtcmos.c
 ramstage-y += soc.c
-ramstage-$(CONFIG_SPI_FLASH) += spi.c
+ramstage-$(CONFIG_SPI_FLASH) += ../common/spi.c spi.c
 ramstage-y += ../common/timer.c
 ramstage-$(CONFIG_DRIVERS_UART) += ../common/uart.c
 ramstage-y += ../common/wdt.c

src/soc/mediatek/mt8183/include/soc/addressmap.h

@@ -31,6 +31,12 @@ enum {
 	GPT_BASE		= IO_PHYS + 0x00008000,
 	APMIXED_BASE		= IO_PHYS + 0x0000C000,
 	UART0_BASE		= IO_PHYS + 0x01002000,
+	SPI0_BASE               = IO_PHYS + 0x0100A000,
+	SPI1_BASE		= IO_PHYS + 0x01010000,
+	SPI2_BASE		= IO_PHYS + 0x01012000,
+	SPI3_BASE		= IO_PHYS + 0x01013000,
+	SPI4_BASE		= IO_PHYS + 0x01014000,
+	SPI5_BASE		= IO_PHYS + 0x01015000,
 	IOCFG_RT_BASE		= IO_PHYS + 0x01C50000,
 	IOCFG_RM_BASE		= IO_PHYS + 0x01D20000,
 	IOCFG_RB_BASE		= IO_PHYS + 0x01D30000,

src/soc/mediatek/mt8183/include/soc/pll.h

@@ -260,6 +260,13 @@ enum {
 /* top_div rate */
 enum {
 	CLK26M_HZ	= 26 * MHz,
+	MAINPLL_D5_HZ   = MAINPLL_HZ / 5,
+	MAINPLL_D5_D2_HZ = MAINPLL_D5_HZ / 2,
+};
+
+/* top_mux rate */
+enum {
+	SPI_HZ		= MAINPLL_D5_D2_HZ,
 };
 
 #endif /* SOC_MEDIATEK_MT8183_PLL_H */

src/soc/mediatek/mt8183/include/soc/spi.h

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#ifndef MTK_MT8183_SPI_H
+#define MTK_MT8183_SPI_H
+
+#include <soc/spi_common.h>
+
+#define SPI_BUS_NUMBER 6
+
+/* SPI peripheral register map. */
+typedef struct mtk_spi_regs {
+	uint32_t spi_cfg0_reg;
+	uint32_t spi_cfg1_reg;
+	uint32_t spi_tx_src_reg;
+	uint32_t spi_rx_dst_reg;
+	uint32_t spi_tx_data_reg;
+	uint32_t spi_rx_data_reg;
+	uint32_t spi_cmd_reg;
+	uint32_t spi_status0_reg;
+	uint32_t spi_status1_reg;
+	uint32_t spi_pad_macro_sel_reg;
+	uint32_t spi_cfg2_reg;
+	uint32_t spi_tx_src_64_reg;
+	uint32_t spi_rx_dst_64_reg;
+} mtk_spi_regs;
+
+check_member(mtk_spi_regs, spi_pad_macro_sel_reg, 0x24);
+
+enum {
+	SPI_CFG0_CS_HOLD_SHIFT = 0,
+	SPI_CFG0_CS_SETUP_SHIFT = 16,
+};
+
+enum {
+	SPI_CFG2_SCK_LOW_SHIFT = 0,
+	SPI_CFG2_SCK_HIGH_SHIFT = 16,
+};
+
+
+#endif

src/soc/mediatek/mt8183/spi.c

@@ -13,16 +13,119 @@
  * GNU General Public License for more details.
  */
 
+#include <arch/io.h>
+#include <assert.h>
+#include <spi_flash.h>
+#include <soc/addressmap.h>
 #include <soc/flash_controller.h>
-#include <spi-generic.h>
+#include <soc/gpio.h>
+#include <soc/spi.h>
 
-static const struct spi_ctrlr spi_flash_ctrlr = {
+struct mtk_spi_bus spi_bus[SPI_BUS_NUMBER] = {
-	.max_xfer_size = 65535,
+	{
+		.regs = (void *)SPI0_BASE,
+	},
+	{
+		.regs = (void *)SPI1_BASE,
+	},
+	{
+		.regs = (void *)SPI2_BASE,
+	},
+	{
+		.regs = (void *)SPI3_BASE,
+	},
+	{
+		.regs = (void *)SPI4_BASE,
+	},
+	{
+		.regs = (void *)SPI5_BASE,
+	}
 };
 
+void mtk_spi_set_gpio_pinmux(unsigned int bus,
+			     enum spi_pad_mask pad_select)
+{
+	switch (bus) {
+	case 0:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(SPI_MI), PAD_SPI_MI_FUNC_SPI0_MI);
+			gpio_set_mode(GPIO(SPI_CSB), PAD_SPI_CSB_FUNC_SPI0_CSB);
+			gpio_set_mode(GPIO(SPI_MO), PAD_SPI_MO_FUNC_SPI0_MO);
+			gpio_set_mode(GPIO(SPI_CLK), PAD_SPI_CLK_FUNC_SPI0_CLK);
+		}
+		break;
+	case 1:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(SPI1_MI),
+					PAD_SPI1_MI_FUNC_SPI1_A_MI);
+			gpio_set_mode(GPIO(SPI1_CSB),
+					PAD_SPI1_CSB_FUNC_SPI1_A_CSB);
+			gpio_set_mode(GPIO(SPI1_MO),
+					PAD_SPI1_MO_FUNC_SPI1_A_MO);
+			gpio_set_mode(GPIO(SPI1_CLK),
+					PAD_SPI1_CLK_FUNC_SPI1_A_CLK);
+		}
+		if (pad_select == SPI_PAD1_MASK) {
+			gpio_set_mode(GPIO(EINT7), PAD_EINT7_FUNC_SPI1_B_MI);
+			gpio_set_mode(GPIO(EINT8), PAD_EINT8_FUNC_SPI1_B_CSB);
+			gpio_set_mode(GPIO(EINT9), PAD_EINT9_FUNC_SPI1_B_MO);
+			gpio_set_mode(GPIO(EINT10), PAD_EINT10_FUNC_SPI1_B_CLK);
+		}
+		break;
+	case 2:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(KPCOL1), PAD_KPCOL1_FUNC_SPI2_MI);
+			gpio_set_mode(GPIO(EINT0), PAD_EINT0_FUNC_SPI2_CSB);
+			gpio_set_mode(GPIO(EINT1), PAD_EINT1_FUNC_SPI2_MO);
+			gpio_set_mode(GPIO(EINT2), PAD_EINT2_FUNC_SPI2_CLK);
+		}
+		break;
+	case 3:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(DPI_D8), PAD_DPI_D8_FUNC_SPI3_MI);
+			gpio_set_mode(GPIO(DPI_D9), PAD_DPI_D9_FUNC_SPI3_CSB);
+			gpio_set_mode(GPIO(DPI_D10), PAD_DPI_D10_FUNC_SPI3_MO);
+			gpio_set_mode(GPIO(DPI_D11), PAD_DPI_D11_FUNC_SPI3_CLK);
+		}
+		break;
+	case 4:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(DPI_D4), PAD_DPI_D4_FUNC_SPI4_MI);
+			gpio_set_mode(GPIO(DPI_D5), PAD_DPI_D5_FUNC_SPI4_CSB);
+			gpio_set_mode(GPIO(DPI_D6), PAD_DPI_D6_FUNC_SPI4_MO);
+			gpio_set_mode(GPIO(DPI_D7), PAD_DPI_D7_FUNC_SPI4_CLK);
+		}
+		break;
+	case 5:
+		if (pad_select == SPI_PAD0_MASK) {
+			gpio_set_mode(GPIO(DPI_D0), PAD_DPI_D0_FUNC_SPI5_MI);
+			gpio_set_mode(GPIO(DPI_D1), PAD_DPI_D1_FUNC_SPI5_CSB);
+			gpio_set_mode(GPIO(DPI_D2), PAD_DPI_D2_FUNC_SPI5_MO);
+			gpio_set_mode(GPIO(DPI_D3), PAD_DPI_D3_FUNC_SPI5_CLK);
+		}
+		break;
+	}
+}
+
+void mtk_spi_set_timing(struct mtk_spi_regs *regs, u32 sck_ticks, u32 cs_ticks)
+{
+	write32(&regs->spi_cfg0_reg,
+		((cs_ticks - 1) << SPI_CFG0_CS_HOLD_SHIFT) |
+		((cs_ticks - 1) << SPI_CFG0_CS_SETUP_SHIFT));
+
+	write32(&regs->spi_cfg2_reg,
+		((sck_ticks - 1) << SPI_CFG2_SCK_HIGH_SHIFT) |
+		((sck_ticks - 1) << SPI_CFG2_SCK_LOW_SHIFT));
+
+	clrsetbits_le32(&regs->spi_cfg1_reg, SPI_CFG1_CS_IDLE_MASK,
+			((cs_ticks - 1) << SPI_CFG1_CS_IDLE_SHIFT));
+}
+
 const struct spi_ctrlr_buses spi_ctrlr_bus_map[] = {
 	{
-		.ctrlr = &spi_flash_ctrlr,
+		.ctrlr = &spi_ctrlr,
+		.bus_start = 0,
+		.bus_end = SPI_BUS_NUMBER - 1,
 	},
 };