From cbd66c626e16743b05af807ad48012c0a097b9fb Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Mon, 25 Mar 2019 09:29:25 +0100 Subject: spi: mt7621: Move SPI driver out of staging This patch moves the MT7621 SPI driver, which is used on some Ralink / MediaTek MT76xx MIPS SoC's, out of the staging directory. No changes to the source code are done in this patch. This driver version was tested successfully on an MT7688 based platform with an SPI NOR on CS0 and an SPI NAND on CS1 without any issues (so far). This patch also documents the devicetree bindings for the MT7621 SPI device driver. Signed-off-by: Stefan Roese Cc: Rob Herring Cc: Mark Brown Cc: Greg Kroah-Hartman Cc: NeilBrown Cc: Sankalp Negi Cc: Chuanhong Guo Cc: John Crispin Cc: Armando Miraglia Signed-off-by: Mark Brown --- drivers/staging/Kconfig | 2 - drivers/staging/Makefile | 1 - drivers/staging/mt7621-spi/Kconfig | 6 - drivers/staging/mt7621-spi/Makefile | 1 - drivers/staging/mt7621-spi/TODO | 5 - drivers/staging/mt7621-spi/spi-mt7621.c | 422 -------------------------------- 6 files changed, 437 deletions(-) delete mode 100644 drivers/staging/mt7621-spi/Kconfig delete mode 100644 drivers/staging/mt7621-spi/Makefile delete mode 100644 drivers/staging/mt7621-spi/TODO delete mode 100644 drivers/staging/mt7621-spi/spi-mt7621.c (limited to 'drivers/staging') diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig index c0901b96cfe4..3241bd50d139 100644 --- a/drivers/staging/Kconfig +++ b/drivers/staging/Kconfig @@ -106,8 +106,6 @@ source "drivers/staging/mt7621-pci-phy/Kconfig" source "drivers/staging/mt7621-pinctrl/Kconfig" -source "drivers/staging/mt7621-spi/Kconfig" - source "drivers/staging/mt7621-dma/Kconfig" source "drivers/staging/ralink-gdma/Kconfig" diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile index 57c6bce13ff4..296ff11ecfae 100644 --- a/drivers/staging/Makefile +++ b/drivers/staging/Makefile @@ -43,7 +43,6 @@ obj-$(CONFIG_PI433) += pi433/ obj-$(CONFIG_PCI_MT7621) += mt7621-pci/ obj-$(CONFIG_PCI_MT7621_PHY) += mt7621-pci-phy/ obj-$(CONFIG_PINCTRL_RT2880) += mt7621-pinctrl/ -obj-$(CONFIG_SPI_MT7621) += mt7621-spi/ obj-$(CONFIG_SOC_MT7621) += mt7621-dma/ obj-$(CONFIG_DMA_RALINK) += ralink-gdma/ obj-$(CONFIG_MTK_MMC) += mt7621-mmc/ diff --git a/drivers/staging/mt7621-spi/Kconfig b/drivers/staging/mt7621-spi/Kconfig deleted file mode 100644 index 0b90f4cfa426..000000000000 --- a/drivers/staging/mt7621-spi/Kconfig +++ /dev/null @@ -1,6 +0,0 @@ -config SPI_MT7621 - tristate "MediaTek MT7621 SPI Controller" - depends on RALINK - help - This selects a driver for the MediaTek MT7621 SPI Controller. - diff --git a/drivers/staging/mt7621-spi/Makefile b/drivers/staging/mt7621-spi/Makefile deleted file mode 100644 index 3be508f63bac..000000000000 --- a/drivers/staging/mt7621-spi/Makefile +++ /dev/null @@ -1 +0,0 @@ -obj-$(CONFIG_SPI_MT7621) += spi-mt7621.o diff --git a/drivers/staging/mt7621-spi/TODO b/drivers/staging/mt7621-spi/TODO deleted file mode 100644 index fdbc5002c32a..000000000000 --- a/drivers/staging/mt7621-spi/TODO +++ /dev/null @@ -1,5 +0,0 @@ - -- general code review and clean up -- ensure device-tree requirements are documented - -Cc: NeilBrown diff --git a/drivers/staging/mt7621-spi/spi-mt7621.c b/drivers/staging/mt7621-spi/spi-mt7621.c deleted file mode 100644 index b509f9fe3346..000000000000 --- a/drivers/staging/mt7621-spi/spi-mt7621.c +++ /dev/null @@ -1,422 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * spi-mt7621.c -- MediaTek MT7621 SPI controller driver - * - * Copyright (C) 2011 Sergiy - * Copyright (C) 2011-2013 Gabor Juhos - * Copyright (C) 2014-2015 Felix Fietkau - * - * Some parts are based on spi-orion.c: - * Author: Shadi Ammouri - * Copyright (C) 2007-2008 Marvell Ltd. - */ - -#include -#include -#include -#include -#include -#include -#include - -#define DRIVER_NAME "spi-mt7621" - -/* in usec */ -#define RALINK_SPI_WAIT_MAX_LOOP 2000 - -/* SPISTAT register bit field */ -#define SPISTAT_BUSY BIT(0) - -#define MT7621_SPI_TRANS 0x00 -#define SPITRANS_BUSY BIT(16) - -#define MT7621_SPI_OPCODE 0x04 -#define MT7621_SPI_DATA0 0x08 -#define MT7621_SPI_DATA4 0x18 -#define SPI_CTL_TX_RX_CNT_MASK 0xff -#define SPI_CTL_START BIT(8) - -#define MT7621_SPI_MASTER 0x28 -#define MASTER_MORE_BUFMODE BIT(2) -#define MASTER_FULL_DUPLEX BIT(10) -#define MASTER_RS_CLK_SEL GENMASK(27, 16) -#define MASTER_RS_CLK_SEL_SHIFT 16 -#define MASTER_RS_SLAVE_SEL GENMASK(31, 29) - -#define MT7621_SPI_MOREBUF 0x2c -#define MT7621_SPI_POLAR 0x38 -#define MT7621_SPI_SPACE 0x3c - -#define MT7621_CPHA BIT(5) -#define MT7621_CPOL BIT(4) -#define MT7621_LSB_FIRST BIT(3) - -struct mt7621_spi { - struct spi_master *master; - void __iomem *base; - unsigned int sys_freq; - unsigned int speed; - struct clk *clk; - int pending_write; - - struct mt7621_spi_ops *ops; -}; - -static inline struct mt7621_spi *spidev_to_mt7621_spi(struct spi_device *spi) -{ - return spi_master_get_devdata(spi->master); -} - -static inline u32 mt7621_spi_read(struct mt7621_spi *rs, u32 reg) -{ - return ioread32(rs->base + reg); -} - -static inline void mt7621_spi_write(struct mt7621_spi *rs, u32 reg, u32 val) -{ - iowrite32(val, rs->base + reg); -} - -static void mt7621_spi_reset(struct mt7621_spi *rs) -{ - u32 master = mt7621_spi_read(rs, MT7621_SPI_MASTER); - - /* - * Select SPI device 7, enable "more buffer mode" and disable - * full-duplex (only half-duplex really works on this chip - * reliably) - */ - master |= MASTER_RS_SLAVE_SEL | MASTER_MORE_BUFMODE; - master &= ~MASTER_FULL_DUPLEX; - - mt7621_spi_write(rs, MT7621_SPI_MASTER, master); - rs->pending_write = 0; -} - -static void mt7621_spi_set_cs(struct spi_device *spi, int enable) -{ - struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); - int cs = spi->chip_select; - u32 polar = 0; - - mt7621_spi_reset(rs); - if (enable) - polar = BIT(cs); - mt7621_spi_write(rs, MT7621_SPI_POLAR, polar); -} - -static int mt7621_spi_prepare(struct spi_device *spi, unsigned int speed) -{ - struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); - u32 rate; - u32 reg; - - dev_dbg(&spi->dev, "speed:%u\n", speed); - - rate = DIV_ROUND_UP(rs->sys_freq, speed); - dev_dbg(&spi->dev, "rate-1:%u\n", rate); - - if (rate > 4097) - return -EINVAL; - - if (rate < 2) - rate = 2; - - reg = mt7621_spi_read(rs, MT7621_SPI_MASTER); - reg &= ~MASTER_RS_CLK_SEL; - reg |= (rate - 2) << MASTER_RS_CLK_SEL_SHIFT; - rs->speed = speed; - - reg &= ~MT7621_LSB_FIRST; - if (spi->mode & SPI_LSB_FIRST) - reg |= MT7621_LSB_FIRST; - - /* - * This SPI controller seems to be tested on SPI flash only and some - * bits are swizzled under other SPI modes probably due to incorrect - * wiring inside the silicon. Only mode 0 works correctly. - */ - reg &= ~(MT7621_CPHA | MT7621_CPOL); - - mt7621_spi_write(rs, MT7621_SPI_MASTER, reg); - - return 0; -} - -static inline int mt7621_spi_wait_till_ready(struct mt7621_spi *rs) -{ - int i; - - for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) { - u32 status; - - status = mt7621_spi_read(rs, MT7621_SPI_TRANS); - if ((status & SPITRANS_BUSY) == 0) - return 0; - cpu_relax(); - udelay(1); - } - - return -ETIMEDOUT; -} - -static void mt7621_spi_read_half_duplex(struct mt7621_spi *rs, - int rx_len, u8 *buf) -{ - /* - * Combine with any pending write, and perform one or more half-duplex - * transactions reading 'len' bytes. Data to be written is already in - * MT7621_SPI_DATA. - */ - int tx_len = rs->pending_write; - - rs->pending_write = 0; - - while (rx_len || tx_len) { - int i; - u32 val = (min(tx_len, 4) * 8) << 24; - int rx = min(rx_len, 32); - - if (tx_len > 4) - val |= (tx_len - 4) * 8; - val |= (rx * 8) << 12; - mt7621_spi_write(rs, MT7621_SPI_MOREBUF, val); - - tx_len = 0; - - val = mt7621_spi_read(rs, MT7621_SPI_TRANS); - val |= SPI_CTL_START; - mt7621_spi_write(rs, MT7621_SPI_TRANS, val); - - mt7621_spi_wait_till_ready(rs); - - for (i = 0; i < rx; i++) { - if ((i % 4) == 0) - val = mt7621_spi_read(rs, MT7621_SPI_DATA0 + i); - *buf++ = val & 0xff; - val >>= 8; - } - - rx_len -= i; - } -} - -static inline void mt7621_spi_flush(struct mt7621_spi *rs) -{ - mt7621_spi_read_half_duplex(rs, 0, NULL); -} - -static void mt7621_spi_write_half_duplex(struct mt7621_spi *rs, - int tx_len, const u8 *buf) -{ - int val = 0; - int len = rs->pending_write; - - if (len & 3) { - val = mt7621_spi_read(rs, MT7621_SPI_OPCODE + (len & ~3)); - if (len < 4) { - val <<= (4 - len) * 8; - val = swab32(val); - } - } - - while (tx_len > 0) { - if (len >= 36) { - rs->pending_write = len; - mt7621_spi_flush(rs); - len = 0; - } - - val |= *buf++ << (8 * (len & 3)); - len++; - if ((len & 3) == 0) { - if (len == 4) - /* The byte-order of the opcode is weird! */ - val = swab32(val); - mt7621_spi_write(rs, MT7621_SPI_OPCODE + len - 4, val); - val = 0; - } - tx_len -= 1; - } - if (len & 3) { - if (len < 4) { - val = swab32(val); - val >>= (4 - len) * 8; - } - mt7621_spi_write(rs, MT7621_SPI_OPCODE + (len & ~3), val); - } - rs->pending_write = len; -} - -static int mt7621_spi_transfer_one_message(struct spi_master *master, - struct spi_message *m) -{ - struct mt7621_spi *rs = spi_master_get_devdata(master); - struct spi_device *spi = m->spi; - unsigned int speed = spi->max_speed_hz; - struct spi_transfer *t = NULL; - int status = 0; - - mt7621_spi_wait_till_ready(rs); - - list_for_each_entry(t, &m->transfers, transfer_list) - if (t->speed_hz < speed) - speed = t->speed_hz; - - if (mt7621_spi_prepare(spi, speed)) { - status = -EIO; - goto msg_done; - } - - mt7621_spi_set_cs(spi, 1); - m->actual_length = 0; - list_for_each_entry(t, &m->transfers, transfer_list) { - if ((t->rx_buf) && (t->tx_buf)) { - /* This controller will shift some extra data out - * of spi_opcode if (mosi_bit_cnt > 0) && - * (cmd_bit_cnt == 0). So the claimed full-duplex - * support is broken since we have no way to read - * the MISO value during that bit. - */ - status = -EIO; - goto msg_done; - } else if (t->rx_buf) { - mt7621_spi_read_half_duplex(rs, t->len, t->rx_buf); - } else if (t->tx_buf) { - mt7621_spi_write_half_duplex(rs, t->len, t->tx_buf); - } - m->actual_length += t->len; - } - mt7621_spi_flush(rs); - - mt7621_spi_set_cs(spi, 0); - -msg_done: - m->status = status; - spi_finalize_current_message(master); - - return 0; -} - -static int mt7621_spi_setup(struct spi_device *spi) -{ - struct mt7621_spi *rs = spidev_to_mt7621_spi(spi); - - if ((spi->max_speed_hz == 0) || - (spi->max_speed_hz > (rs->sys_freq / 2))) - spi->max_speed_hz = (rs->sys_freq / 2); - - if (spi->max_speed_hz < (rs->sys_freq / 4097)) { - dev_err(&spi->dev, "setup: requested speed is too low %d Hz\n", - spi->max_speed_hz); - return -EINVAL; - } - - return 0; -} - -static const struct of_device_id mt7621_spi_match[] = { - { .compatible = "ralink,mt7621-spi" }, - {}, -}; -MODULE_DEVICE_TABLE(of, mt7621_spi_match); - -static int mt7621_spi_probe(struct platform_device *pdev) -{ - const struct of_device_id *match; - struct spi_master *master; - struct mt7621_spi *rs; - void __iomem *base; - struct resource *r; - int status = 0; - struct clk *clk; - struct mt7621_spi_ops *ops; - int ret; - - match = of_match_device(mt7621_spi_match, &pdev->dev); - if (!match) - return -EINVAL; - ops = (struct mt7621_spi_ops *)match->data; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); - base = devm_ioremap_resource(&pdev->dev, r); - if (IS_ERR(base)) - return PTR_ERR(base); - - clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(clk)) { - dev_err(&pdev->dev, "unable to get SYS clock, err=%d\n", - status); - return PTR_ERR(clk); - } - - status = clk_prepare_enable(clk); - if (status) - return status; - - master = spi_alloc_master(&pdev->dev, sizeof(*rs)); - if (!master) { - dev_info(&pdev->dev, "master allocation failed\n"); - return -ENOMEM; - } - - master->mode_bits = SPI_LSB_FIRST; - - master->setup = mt7621_spi_setup; - master->transfer_one_message = mt7621_spi_transfer_one_message; - master->bits_per_word_mask = SPI_BPW_MASK(8); - master->dev.of_node = pdev->dev.of_node; - master->num_chipselect = 2; - - dev_set_drvdata(&pdev->dev, master); - - rs = spi_master_get_devdata(master); - rs->base = base; - rs->clk = clk; - rs->master = master; - rs->sys_freq = clk_get_rate(rs->clk); - rs->ops = ops; - rs->pending_write = 0; - dev_info(&pdev->dev, "sys_freq: %u\n", rs->sys_freq); - - ret = device_reset(&pdev->dev); - if (ret) { - dev_err(&pdev->dev, "SPI reset failed!\n"); - return ret; - } - - mt7621_spi_reset(rs); - - return spi_register_master(master); -} - -static int mt7621_spi_remove(struct platform_device *pdev) -{ - struct spi_master *master; - struct mt7621_spi *rs; - - master = dev_get_drvdata(&pdev->dev); - rs = spi_master_get_devdata(master); - - clk_disable(rs->clk); - spi_unregister_master(master); - - return 0; -} - -MODULE_ALIAS("platform:" DRIVER_NAME); - -static struct platform_driver mt7621_spi_driver = { - .driver = { - .name = DRIVER_NAME, - .of_match_table = mt7621_spi_match, - }, - .probe = mt7621_spi_probe, - .remove = mt7621_spi_remove, -}; - -module_platform_driver(mt7621_spi_driver); - -MODULE_DESCRIPTION("MT7621 SPI driver"); -MODULE_AUTHOR("Felix Fietkau "); -MODULE_LICENSE("GPL"); -- cgit v1.2.3