[U-Boot] [PATCH 18/20] spi: mtk_qspi: add qspi driver for MT7629 SoC

[Jagan Teki]

On Tue, Oct 2, 2018 at 4:38 PM Ryder Lee <ryder.lee at mediatek.com> wrote:
>
> From: Guochun Mao <guochun.mao at mediatek.com>
>
> This patch adds MT7629 qspi driver for accessing SPI NOR flash.
>
> Cc: Jagan Teki <jagan at openedev.com>
> Signed-off-by: Guochun Mao <guochun.mao at mediatek.com>
> ---
>  drivers/spi/Kconfig    |   7 +
>  drivers/spi/Makefile   |   1 +
>  drivers/spi/mtk_qspi.c | 406 +++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 414 insertions(+)
>  create mode 100644 drivers/spi/mtk_qspi.c
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 7d4d47d..0c37ac0 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -117,6 +117,13 @@ config MVEBU_A3700_SPI
>           used to access the SPI NOR flash on platforms embedding this
>           Marvell IP core.
>
> +config MTK_QSPI
> +       bool "Mediatek QSPI driver"
> +       help
> +         Enable the Mediatek QSPI driver. This driver can be
> +         used to access the SPI NOR flash on platforms embedding this
> +         Mediatek QSPI IP core.
> +
>  config PIC32_SPI
>         bool "Microchip PIC32 SPI driver"
>         depends on MACH_PIC32
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 6679987..f1c6400 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -32,6 +32,7 @@ obj-$(CONFIG_KIRKWOOD_SPI) += kirkwood_spi.o
>  obj-$(CONFIG_LPC32XX_SSP) += lpc32xx_ssp.o
>  obj-$(CONFIG_MPC8XX_SPI) += mpc8xx_spi.o
>  obj-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
> +obj-$(CONFIG_MTK_QSPI) += mtk_qspi.o
>  obj-$(CONFIG_MVEBU_A3700_SPI) += mvebu_a3700_spi.o
>  obj-$(CONFIG_MXC_SPI) += mxc_spi.o
>  obj-$(CONFIG_MXS_SPI) += mxs_spi.o
> diff --git a/drivers/spi/mtk_qspi.c b/drivers/spi/mtk_qspi.c
> new file mode 100644
> index 0000000..87117fa
> --- /dev/null
> +++ b/drivers/spi/mtk_qspi.c
> @@ -0,0 +1,406 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018  MediaTek, Inc.
> + * Author : Guochun.Mao at mediatek.com
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <malloc.h>
> +#include <spi.h>
> +#include <asm/io.h>
> +#include <linux/iopoll.h>
> +#include <linux/ioport.h>
> +
> +/* Register Offset */
> +struct mtk_qspi_regs {
> +       u32 cmd;
> +       u32 cnt;
> +       u32 rdsr;
> +       u32 rdata;
> +       u32 radr[3];
> +       u32 wdata;
> +       u32 prgdata[6];
> +       u32 shreg[10];
> +       u32 cfg[2];
> +       u32 shreg10;
> +       u32 mode_mon;
> +       u32 status[4];
> +       u32 flash_time;
> +       u32 flash_cfg;
> +       u32 reserved_0[3];
> +       u32 sf_time;
> +       u32 pp_dw_data;
> +       u32 reserved_1;
> +       u32 delsel_0[2];
> +       u32 intrstus;
> +       u32 intren;
> +       u32 reserved_2;
> +       u32 cfg3;
> +       u32 reserved_3;
> +       u32 chksum;
> +       u32 aaicmd;
> +       u32 wrprot;
> +       u32 radr3;
> +       u32 dual;
> +       u32 delsel_1[3];
> +};
> +
> +struct mtk_qspi_platdata {
> +       fdt_addr_t reg_base;
> +       fdt_addr_t mem_base;
> +};
> +
> +struct mtk_qspi_priv {
> +       struct mtk_qspi_regs *regs;
> +       unsigned long *mem_base;
> +       u8 op;
> +       /* Max paras length is 3 bytes. */
> +       u8 tx[3];
> +       u32 txlen;
> +       u8 *rx;
> +       u32 rxlen;
> +};
> +
> +#define MTK_QSPI_CMD_POLLINGREG_US 500000
> +#define MTK_QSPI_WRBUF_SIZE        256
> +#define MTK_QSPI_COMMAND_ENABLE    0x30
> +
> +/* NOR flash controller commands */
> +#define MTK_QSPI_RD_TRIGGER        BIT(0)
> +#define MTK_QSPI_READSTATUS        BIT(1)
> +#define MTK_QSPI_PRG_CMD           BIT(2)
> +#define MTK_QSPI_WR_TRIGGER        BIT(4)
> +#define MTK_QSPI_WRITESTATUS       BIT(5)
> +#define MTK_QSPI_AUTOINC           BIT(7)
> +
> +/* NOR flash commands */
> +#define MTK_QSPI_OP_WREN           0x6
> +#define MTK_QSPI_OP_READ_QUAD      0x6B
> +#define MTK_QSPI_OP_READ_DUAL      0x3B
> +#define MTK_QSPI_OP_FAST_READ      0xB
> +#define MTK_QSPI_OP_READ           0x3
> +#define MTK_QSPI_OP_PP             0x2

NAK, we don't allow flash commands in spi. Better handle via spi-mem
or flash side.