Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 305e503b authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

spi: remove w90x900 driver 

The ARM w90x900 platform is getting removed, so this driver is obsolete.

Link: https://lore.kernel.org/r/20190809202749.742267-8-arnd@arndb.de


Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 00d2fbf7

drivers/spi/Kconfig

+0 −7
Original line number Diff line number Diff line
@@ -440,13 +440,6 @@ config SPI_NPCM_PSPI 
	  This driver provides support for Nuvoton NPCM BMC

	  Peripheral SPI controller in master mode.



config SPI_NUC900

	tristate "Nuvoton NUC900 series SPI"

	depends on ARCH_W90X900

	select SPI_BITBANG

	help

	  SPI driver for Nuvoton NUC900 series ARM SoCs



config SPI_LANTIQ_SSC

	tristate "Lantiq SSC SPI controller"

	depends on LANTIQ || COMPILE_TEST

drivers/spi/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -64,7 +64,6 @@ obj-$(CONFIG_SPI_MT7621) += spi-mt7621.o 
obj-$(CONFIG_SPI_MXIC)			+= spi-mxic.o

obj-$(CONFIG_SPI_MXS)			+= spi-mxs.o

obj-$(CONFIG_SPI_NPCM_PSPI)		+= spi-npcm-pspi.o

obj-$(CONFIG_SPI_NUC900)		+= spi-nuc900.o

obj-$(CONFIG_SPI_NXP_FLEXSPI)		+= spi-nxp-fspi.o

obj-$(CONFIG_SPI_OC_TINY)		+= spi-oc-tiny.o

spi-octeon-objs				:= spi-cavium.o spi-cavium-octeon.o

drivers/spi/spi-nuc900.c

deleted100644 → 0
+0 −429
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) 2009 Nuvoton technology.

 * Wan ZongShun <mcuos.com@gmail.com>

 */



#include <linux/module.h>

#include <linux/spinlock.h>

#include <linux/interrupt.h>

#include <linux/delay.h>

#include <linux/errno.h>

#include <linux/err.h>

#include <linux/clk.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/gpio.h>

#include <linux/io.h>

#include <linux/slab.h>



#include <linux/spi/spi.h>

#include <linux/spi/spi_bitbang.h>



#include <linux/platform_data/spi-nuc900.h>



/* usi registers offset */

#define USI_CNT		0x00

#define USI_DIV		0x04

#define USI_SSR		0x08

#define USI_RX0		0x10

#define USI_TX0		0x10



/* usi register bit */

#define ENINT		(0x01 << 17)

#define ENFLG		(0x01 << 16)

#define SLEEP		(0x0f << 12)

#define TXNUM		(0x03 << 8)

#define TXBITLEN	(0x1f << 3)

#define TXNEG		(0x01 << 2)

#define RXNEG		(0x01 << 1)

#define LSB		(0x01 << 10)

#define SELECTLEV	(0x01 << 2)

#define SELECTPOL	(0x01 << 31)

#define SELECTSLAVE	0x01

#define GOBUSY		0x01



struct nuc900_spi {

	struct spi_bitbang	 bitbang;

	struct completion	 done;

	void __iomem		*regs;

	int			 irq;

	int			 len;

	int			 count;

	const unsigned char	*tx;

	unsigned char		*rx;

	struct clk		*clk;

	struct spi_master	*master;

	struct nuc900_spi_info *pdata;

	spinlock_t		lock;

};



static inline struct nuc900_spi *to_hw(struct spi_device *sdev)

{

	return spi_master_get_devdata(sdev->master);

}



static void nuc900_slave_select(struct spi_device *spi, unsigned int ssr)

{

	struct nuc900_spi *hw = to_hw(spi);

	unsigned int val;

	unsigned int cs = spi->mode & SPI_CS_HIGH ? 1 : 0;

	unsigned int cpol = spi->mode & SPI_CPOL ? 1 : 0;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_SSR);



	if (!cs)

		val &= ~SELECTLEV;

	else

		val |= SELECTLEV;



	if (!ssr)

		val &= ~SELECTSLAVE;

	else

		val |= SELECTSLAVE;



	__raw_writel(val, hw->regs + USI_SSR);



	val = __raw_readl(hw->regs + USI_CNT);



	if (!cpol)

		val &= ~SELECTPOL;

	else

		val |= SELECTPOL;



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_spi_chipsel(struct spi_device *spi, int value)

{

	switch (value) {

	case BITBANG_CS_INACTIVE:

		nuc900_slave_select(spi, 0);

		break;



	case BITBANG_CS_ACTIVE:

		nuc900_slave_select(spi, 1);

		break;

	}

}



static void nuc900_spi_setup_txnum(struct nuc900_spi *hw, unsigned int txnum)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT) & ~TXNUM;



	if (txnum)

		val |= txnum << 0x08;



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);



}



static void nuc900_spi_setup_txbitlen(struct nuc900_spi *hw,

							unsigned int txbitlen)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT) & ~TXBITLEN;



	val |= (txbitlen << 0x03);



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_spi_gobusy(struct nuc900_spi *hw)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT);



	val |= GOBUSY;



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static inline unsigned int hw_txbyte(struct nuc900_spi *hw, int count)

{

	return hw->tx ? hw->tx[count] : 0;

}



static int nuc900_spi_txrx(struct spi_device *spi, struct spi_transfer *t)

{

	struct nuc900_spi *hw = to_hw(spi);



	hw->tx = t->tx_buf;

	hw->rx = t->rx_buf;

	hw->len = t->len;

	hw->count = 0;



	__raw_writel(hw_txbyte(hw, 0x0), hw->regs + USI_TX0);



	nuc900_spi_gobusy(hw);



	wait_for_completion(&hw->done);



	return hw->count;

}



static irqreturn_t nuc900_spi_irq(int irq, void *dev)

{

	struct nuc900_spi *hw = dev;

	unsigned int status;

	unsigned int count = hw->count;



	status = __raw_readl(hw->regs + USI_CNT);

	__raw_writel(status, hw->regs + USI_CNT);



	if (status & ENFLG) {

		hw->count++;



		if (hw->rx)

			hw->rx[count] = __raw_readl(hw->regs + USI_RX0);

		count++;



		if (count < hw->len) {

			__raw_writel(hw_txbyte(hw, count), hw->regs + USI_TX0);

			nuc900_spi_gobusy(hw);

		} else {

			complete(&hw->done);

		}



		return IRQ_HANDLED;

	}



	complete(&hw->done);

	return IRQ_HANDLED;

}



static void nuc900_tx_edge(struct nuc900_spi *hw, unsigned int edge)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT);



	if (edge)

		val |= TXNEG;

	else

		val &= ~TXNEG;

	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_rx_edge(struct nuc900_spi *hw, unsigned int edge)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT);



	if (edge)

		val |= RXNEG;

	else

		val &= ~RXNEG;

	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_send_first(struct nuc900_spi *hw, unsigned int lsb)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT);



	if (lsb)

		val |= LSB;

	else

		val &= ~LSB;

	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_set_sleep(struct nuc900_spi *hw, unsigned int sleep)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT) & ~SLEEP;



	if (sleep)

		val |= (sleep << 12);



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_enable_int(struct nuc900_spi *hw)

{

	unsigned int val;

	unsigned long flags;



	spin_lock_irqsave(&hw->lock, flags);



	val = __raw_readl(hw->regs + USI_CNT);



	val |= ENINT;



	__raw_writel(val, hw->regs + USI_CNT);



	spin_unlock_irqrestore(&hw->lock, flags);

}



static void nuc900_set_divider(struct nuc900_spi *hw)

{

	__raw_writel(hw->pdata->divider, hw->regs + USI_DIV);

}



static void nuc900_init_spi(struct nuc900_spi *hw)

{

	clk_enable(hw->clk);

	spin_lock_init(&hw->lock);



	nuc900_tx_edge(hw, hw->pdata->txneg);

	nuc900_rx_edge(hw, hw->pdata->rxneg);

	nuc900_send_first(hw, hw->pdata->lsb);

	nuc900_set_sleep(hw, hw->pdata->sleep);

	nuc900_spi_setup_txbitlen(hw, hw->pdata->txbitlen);

	nuc900_spi_setup_txnum(hw, hw->pdata->txnum);

	nuc900_set_divider(hw);

	nuc900_enable_int(hw);

}



static int nuc900_spi_probe(struct platform_device *pdev)

{

	struct nuc900_spi *hw;

	struct spi_master *master;

	struct resource *res;

	int err = 0;



	master = spi_alloc_master(&pdev->dev, sizeof(struct nuc900_spi));

	if (master == NULL) {

		dev_err(&pdev->dev, "No memory for spi_master\n");

		return -ENOMEM;

	}



	hw = spi_master_get_devdata(master);

	hw->master = master;

	hw->pdata  = dev_get_platdata(&pdev->dev);



	if (hw->pdata == NULL) {

		dev_err(&pdev->dev, "No platform data supplied\n");

		err = -ENOENT;

		goto err_pdata;

	}



	platform_set_drvdata(pdev, hw);

	init_completion(&hw->done);



	master->mode_bits          = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	if (hw->pdata->lsb)

		master->mode_bits |= SPI_LSB_FIRST;

	master->num_chipselect     = hw->pdata->num_cs;

	master->bus_num            = hw->pdata->bus_num;

	hw->bitbang.master         = hw->master;

	hw->bitbang.chipselect     = nuc900_spi_chipsel;

	hw->bitbang.txrx_bufs      = nuc900_spi_txrx;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	hw->regs = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(hw->regs)) {

		err = PTR_ERR(hw->regs);

		goto err_pdata;

	}



	hw->irq = platform_get_irq(pdev, 0);

	if (hw->irq < 0) {

		dev_err(&pdev->dev, "No IRQ specified\n");

		err = -ENOENT;

		goto err_pdata;

	}



	err = devm_request_irq(&pdev->dev, hw->irq, nuc900_spi_irq, 0,

				pdev->name, hw);

	if (err) {

		dev_err(&pdev->dev, "Cannot claim IRQ\n");

		goto err_pdata;

	}



	hw->clk = devm_clk_get(&pdev->dev, "spi");

	if (IS_ERR(hw->clk)) {

		dev_err(&pdev->dev, "No clock for device\n");

		err = PTR_ERR(hw->clk);

		goto err_pdata;

	}



	mfp_set_groupg(&pdev->dev, NULL);

	nuc900_init_spi(hw);



	err = spi_bitbang_start(&hw->bitbang);

	if (err) {

		dev_err(&pdev->dev, "Failed to register SPI master\n");

		goto err_register;

	}



	return 0;



err_register:

	clk_disable(hw->clk);

err_pdata:

	spi_master_put(hw->master);

	return err;

}



static int nuc900_spi_remove(struct platform_device *dev)

{

	struct nuc900_spi *hw = platform_get_drvdata(dev);



	spi_bitbang_stop(&hw->bitbang);

	clk_disable(hw->clk);

	spi_master_put(hw->master);

	return 0;

}



static struct platform_driver nuc900_spi_driver = {

	.probe		= nuc900_spi_probe,

	.remove		= nuc900_spi_remove,

	.driver		= {

		.name	= "nuc900-spi",

	},

};

module_platform_driver(nuc900_spi_driver);



MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");

MODULE_DESCRIPTION("nuc900 spi driver!");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:nuc900-spi");

include/Kbuild

+0 −1
Original line number Diff line number Diff line
@@ -550,7 +550,6 @@ header-test- += linux/platform_data/sky81452-backlight.h 
header-test-			+= linux/platform_data/spi-davinci.h

header-test-			+= linux/platform_data/spi-ep93xx.h

header-test-			+= linux/platform_data/spi-mt65xx.h

header-test-			+= linux/platform_data/spi-nuc900.h

header-test-			+= linux/platform_data/st_sensors_pdata.h

header-test-			+= linux/platform_data/ti-sysc.h

header-test-			+= linux/platform_data/timer-ixp4xx.h

include/linux/platform_data/spi-nuc900.h

deleted100644 → 0
+0 −29
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * Copyright (c) 2009 Nuvoton technology corporation.

 *

 * Wan ZongShun <mcuos.com@gmail.com>

 */



#ifndef __SPI_NUC900_H

#define __SPI_NUC900_H



extern void mfp_set_groupg(struct device *dev, const char *subname);



struct nuc900_spi_info {

	unsigned int num_cs;

	unsigned int lsb;

	unsigned int txneg;

	unsigned int rxneg;

	unsigned int divider;

	unsigned int sleep;

	unsigned int txnum;

	unsigned int txbitlen;

	int bus_num;

};



struct nuc900_spi_chip {

	unsigned char bits_per_word;

};



#endif /* __SPI_NUC900_H */