[U-Boot] [PATCH v3 1/5] spi: remove obsolete mtk_qspi driver

[U-Boot] [PATCH v3 1/5] spi: remove obsolete mtk_qspi driver

[Weijie Gao]

Since u-boot has added the spi-mem framework and replaced the spi-nor
framework, the mtk_qspi is no longer compatible with the new spi-nor
driver.

Remove this driver, and a new driver will be added later.

Cc: Jagan Teki <jagan@openedev.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
---
Changes since v2: none
---
 drivers/spi/Kconfig    |   8 -
 drivers/spi/Makefile   |   1 -
 drivers/spi/mtk_qspi.c | 359 -----------------------------------------
 3 files changed, 368 deletions(-)
 delete mode 100644 drivers/spi/mtk_qspi.c

diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index dc3e23f353a..4f0f5d99953 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -139,14 +139,6 @@ config MT7621_SPI
 	  the SPI NOR flash on platforms embedding this Ralink / MediaTek
 	  SPI core, like MT7621/7628/7688.
 
-config MTK_QSPI
-	bool "Mediatek QSPI driver"
-	imply SPI_FLASH_BAR
-	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 MVEBU_A3700_SPI
 	bool "Marvell Armada 3700 SPI driver"
 	select CLK_ARMADA_3720
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 8be9a4baa24..f1e3becd2b7 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -36,7 +36,6 @@ obj-$(CONFIG_LPC32XX_SSP) += lpc32xx_ssp.o
 obj-$(CONFIG_MESON_SPIFC) += meson_spifc.o
 obj-$(CONFIG_MPC8XX_SPI) += mpc8xx_spi.o
 obj-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
-obj-$(CONFIG_MTK_QSPI) += mtk_qspi.o
 obj-$(CONFIG_MT7621_SPI) += mt7621_spi.o
 obj-$(CONFIG_MSCC_BB_SPI) += mscc_bb_spi.o
 obj-$(CONFIG_MVEBU_A3700_SPI) += mvebu_a3700_spi.o
diff --git a/drivers/spi/mtk_qspi.c b/drivers/spi/mtk_qspi.c
deleted file mode 100644
index b510733e92c..00000000000
--- a/drivers/spi/mtk_qspi.c
+++ /dev/null
@@ -1,359 +0,0 @@
-// 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;
-	u8 tx[3]; /* only record max 3 bytes paras, when it's address. */
-	u32 txlen; /* dout buffer length  - op code length */
-	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)
-
-#define MTK_QSPI_MAX_RX_TX_SHIFT   0x6
-#define MTK_QSPI_MAX_SHIFT         0x8
-
-#define MTK_QSPI_WR_BUF_ENABLE     0x1
-#define MTK_QSPI_WR_BUF_DISABLE    0x0
-
-static int mtk_qspi_execute_cmd(struct mtk_qspi_priv *priv, u8 cmd)
-{
-	u8 tmp;
-	u8 val = cmd & ~MTK_QSPI_AUTOINC;
-
-	writeb(cmd, &priv->regs->cmd);
-
-	return readb_poll_timeout(&priv->regs->cmd, tmp, !(val & tmp),
-				  MTK_QSPI_CMD_POLLINGREG_US);
-}
-
-static int mtk_qspi_tx_rx(struct mtk_qspi_priv *priv)
-{
-	int len = 1 + priv->txlen + priv->rxlen;
-	int i, ret, idx;
-
-	if (len > MTK_QSPI_MAX_SHIFT)
-		return -ERR_INVAL;
-
-	writeb(len * 8, &priv->regs->cnt);
-
-	/* start at PRGDATA5, go down to PRGDATA0 */
-	idx = MTK_QSPI_MAX_RX_TX_SHIFT - 1;
-
-	/* opcode */
-	writeb(priv->op, &priv->regs->prgdata[idx]);
-	idx--;
-
-	/* program TX data */
-	for (i = 0; i < priv->txlen; i++, idx--)
-		writeb(priv->tx[i], &priv->regs->prgdata[idx]);
-
-	/* clear out rest of TX registers */
-	while (idx >= 0) {
-		writeb(0, &priv->regs->prgdata[idx]);
-		idx--;
-	}
-
-	ret = mtk_qspi_execute_cmd(priv, MTK_QSPI_PRG_CMD);
-	if (ret)
-		return ret;
-
-	/* restart at first RX byte */
-	idx = priv->rxlen - 1;
-
-	/* read out RX data */
-	for (i = 0; i < priv->rxlen; i++, idx--)
-		priv->rx[i] = readb(&priv->regs->shreg[idx]);
-
-	return 0;
-}
-
-static int mtk_qspi_read(struct mtk_qspi_priv *priv,
-			 u32 addr, u8 *buf, u32 len)
-{
-	memcpy(buf, (u8 *)priv->mem_base + addr, len);
-	return 0;
-}
-
-static void mtk_qspi_set_addr(struct mtk_qspi_priv *priv, u32 addr)
-{
-	int i;
-
-	for (i = 0; i < 3; i++) {
-		writeb(addr & 0xff, &priv->regs->radr[i]);
-		addr >>= 8;
-	}
-}
-
-static int mtk_qspi_write_single_byte(struct mtk_qspi_priv *priv,
-				      u32 addr, u32 length, const u8 *data)
-{
-	int i, ret;
-
-	mtk_qspi_set_addr(priv, addr);
-
-	for (i = 0; i < length; i++) {
-		writeb(*data++, &priv->regs->wdata);
-		ret = mtk_qspi_execute_cmd(priv, MTK_QSPI_WR_TRIGGER);
-		if (ret < 0)
-			return ret;
-	}
-	return 0;
-}
-
-static int mtk_qspi_write_buffer(struct mtk_qspi_priv *priv, u32 addr,
-				 const u8 *buf)
-{
-	int i, data;
-
-	mtk_qspi_set_addr(priv, addr);
-
-	for (i = 0; i < MTK_QSPI_WRBUF_SIZE; i += 4) {
-		data = buf[i + 3] << 24 | buf[i + 2] << 16 |
-		       buf[i + 1] << 8 | buf[i];
-		writel(data, &priv->regs->pp_dw_data);
-	}
-
-	return mtk_qspi_execute_cmd(priv, MTK_QSPI_WR_TRIGGER);
-}
-
-static int mtk_qspi_write(struct mtk_qspi_priv *priv,
-			  u32 addr, const u8 *buf, u32 len)
-{
-	int ret;
-
-	/* setting pre-fetch buffer for page program */
-	writel(MTK_QSPI_WR_BUF_ENABLE, &priv->regs->cfg[1]);
-	while (len >= MTK_QSPI_WRBUF_SIZE) {
-		ret = mtk_qspi_write_buffer(priv, addr, buf);
-		if (ret < 0)
-			return ret;
-
-		len -= MTK_QSPI_WRBUF_SIZE;
-		addr += MTK_QSPI_WRBUF_SIZE;
-		buf += MTK_QSPI_WRBUF_SIZE;
-	}
-	/* disable pre-fetch buffer for page program */
-	writel(MTK_QSPI_WR_BUF_DISABLE, &priv->regs->cfg[1]);
-
-	if (len)
-		return mtk_qspi_write_single_byte(priv, addr, len, buf);
-
-	return 0;
-}
-
-static int mtk_qspi_claim_bus(struct udevice *dev)
-{
-	/* nothing to do */
-	return 0;
-}
-
-static int mtk_qspi_release_bus(struct udevice *dev)
-{
-	/* nothing to do */
-	return 0;
-}
-
-static int mtk_qspi_transfer(struct mtk_qspi_priv *priv, unsigned int bitlen,
-			     const void *dout, void *din, unsigned long flags)
-{
-	u32 bytes = DIV_ROUND_UP(bitlen, 8);
-	u32 addr;
-
-	if (!bytes)
-		return -ERR_INVAL;
-
-	if (dout) {
-		if (flags & SPI_XFER_BEGIN) {
-			/* parse op code and potential paras first */
-			priv->op = *(u8 *)dout;
-			if (bytes > 1)
-				memcpy(priv->tx, (u8 *)dout + 1,
-				       bytes <= 4 ? bytes - 1 : 3);
-			priv->txlen = bytes - 1;
-		}
-
-		if (flags == SPI_XFER_ONCE) {
-			/* operations without receiving or sending data.
-			 * for example: erase, write flash register or write
-			 * enable...
-			 */
-			priv->rx = NULL;
-			priv->rxlen = 0;
-			return mtk_qspi_tx_rx(priv);
-		}
-
-		if (flags & SPI_XFER_END) {
-			/* here, dout should be data to be written.
-			 * and priv->tx should be filled 3Bytes address.
-			 */
-			addr = priv->tx[0] << 16 | priv->tx[1] << 8 |
-			       priv->tx[2];
-			return mtk_qspi_write(priv, addr, (u8 *)dout, bytes);
-		}
-	}
-
-	if (din) {
-		if (priv->txlen >= 3) {
-			/* if run to here, priv->tx[] should be the address
-			 * where read data from,
-			 * and, din is the buf to receive data.
-			 */
-			addr = priv->tx[0] << 16 | priv->tx[1] << 8 |
-			       priv->tx[2];
-			return mtk_qspi_read(priv, addr, (u8 *)din, bytes);
-		}
-
-		/* should be reading flash's register */
-		priv->rx = (u8 *)din;
-		priv->rxlen = bytes;
-		return mtk_qspi_tx_rx(priv);
-	}
-
-	return 0;
-}
-
-static int mtk_qspi_xfer(struct udevice *dev, unsigned int bitlen,
-			 const void *dout, void *din, unsigned long flags)
-{
-	struct udevice *bus = dev->parent;
-	struct mtk_qspi_priv *priv = dev_get_priv(bus);
-
-	return  mtk_qspi_transfer(priv, bitlen, dout, din, flags);
-}
-
-static int mtk_qspi_set_speed(struct udevice *bus, uint speed)
-{
-	/* nothing to do */
-	return 0;
-}
-
-static int mtk_qspi_set_mode(struct udevice *bus, uint mode)
-{
-	/* nothing to do */
-	return 0;
-}
-
-static int mtk_qspi_ofdata_to_platdata(struct udevice *bus)
-{
-	struct resource res_reg, res_mem;
-	struct mtk_qspi_platdata *plat = bus->platdata;
-	int ret;
-
-	ret = dev_read_resource_byname(bus, "reg_base", &res_reg);
-	if (ret) {
-		debug("can't get reg_base resource(ret = %d)\n", ret);
-		return -ENOMEM;
-	}
-
-	ret = dev_read_resource_byname(bus, "mem_base", &res_mem);
-	if (ret) {
-		debug("can't get map_base resource(ret = %d)\n", ret);
-		return -ENOMEM;
-	}
-
-	plat->mem_base = res_mem.start;
-	plat->reg_base = res_reg.start;
-
-	return 0;
-}
-
-static int mtk_qspi_probe(struct udevice *bus)
-{
-	struct mtk_qspi_platdata *plat = dev_get_platdata(bus);
-	struct mtk_qspi_priv *priv = dev_get_priv(bus);
-
-	priv->regs = (struct mtk_qspi_regs *)plat->reg_base;
-	priv->mem_base = (unsigned long *)plat->mem_base;
-
-	writel(MTK_QSPI_COMMAND_ENABLE, &priv->regs->wrprot);
-
-	return 0;
-}
-
-static const struct dm_spi_ops mtk_qspi_ops = {
-	.claim_bus      = mtk_qspi_claim_bus,
-	.release_bus    = mtk_qspi_release_bus,
-	.xfer           = mtk_qspi_xfer,
-	.set_speed      = mtk_qspi_set_speed,
-	.set_mode       = mtk_qspi_set_mode,
-};
-
-static const struct udevice_id mtk_qspi_ids[] = {
-	{ .compatible = "mediatek,mt7629-qspi" },
-	{ }
-};
-
-U_BOOT_DRIVER(mtk_qspi) = {
-	.name     = "mtk_qspi",
-	.id       = UCLASS_SPI,
-	.of_match = mtk_qspi_ids,
-	.ops      = &mtk_qspi_ops,
-	.ofdata_to_platdata       = mtk_qspi_ofdata_to_platdata,
-	.platdata_auto_alloc_size = sizeof(struct mtk_qspi_platdata),
-	.priv_auto_alloc_size     = sizeof(struct mtk_qspi_priv),
-	.probe    = mtk_qspi_probe,
-};
-- 
2.18.0