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Diffstat (limited to 'target/linux/ep93xx/patches-2.6.30/008-ep93xx-spi.patch')
-rw-r--r--target/linux/ep93xx/patches-2.6.30/008-ep93xx-spi.patch714
1 files changed, 714 insertions, 0 deletions
diff --git a/target/linux/ep93xx/patches-2.6.30/008-ep93xx-spi.patch b/target/linux/ep93xx/patches-2.6.30/008-ep93xx-spi.patch
new file mode 100644
index 0000000..8292bbc
--- /dev/null
+++ b/target/linux/ep93xx/patches-2.6.30/008-ep93xx-spi.patch
@@ -0,0 +1,714 @@
+Index: linux-2.6.30.9/drivers/spi/Kconfig
+===================================================================
+--- linux-2.6.30.9.orig/drivers/spi/Kconfig 2009-11-24 21:09:23.000000000 +0100
++++ linux-2.6.30.9/drivers/spi/Kconfig 2009-11-24 21:09:53.000000000 +0100
+@@ -125,6 +125,12 @@
+
+ If unsure, say N.
+
++config SPI_EP93XX
++ tristate "EP93xx SSP SPI master"
++ depends on SPI_MASTER && ARCH_EP93XX && EXPERIMENTAL
++ help
++ This enables the EP93xx SPI master controller.
++
+ config SPI_IMX
+ tristate "Freescale iMX SPI controller"
+ depends on ARCH_IMX && EXPERIMENTAL
+Index: linux-2.6.30.9/drivers/spi/Makefile
+===================================================================
+--- linux-2.6.30.9.orig/drivers/spi/Makefile 2009-11-24 21:09:23.000000000 +0100
++++ linux-2.6.30.9/drivers/spi/Makefile 2009-11-24 21:09:53.000000000 +0100
+@@ -16,6 +16,7 @@
+ obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
+ obj-$(CONFIG_SPI_AU1550) += au1550_spi.o
+ obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
++obj-$(CONFIG_SPI_EP93XX) += spi_ep93xx.o
+ obj-$(CONFIG_SPI_GPIO) += spi_gpio.o
+ obj-$(CONFIG_SPI_GPIO_OLD) += spi_gpio_old.o
+ obj-$(CONFIG_SPI_IMX) += spi_imx.o
+Index: linux-2.6.30.9/drivers/spi/spi_ep93xx.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.30.9/drivers/spi/spi_ep93xx.c 2009-11-24 21:21:25.000000000 +0100
+@@ -0,0 +1,680 @@
++/*
++ * linux/drivers/spi/spi_ep93xx.c
++ *
++ * Copyright (C) 2007 Manfred Gruber <m.gruber@tirol.com>
++ * Small changes by Peter Ivanov <ivanovp@gmail.com> to support MMC over SPI, 2008
++ * SIM.ONE changes by Nuccio Raciti Simplemachine <nuccio.raciti@gmail.com>
++ *
++ * Based on pxa2xx_spi.c/spi_imx.c and bitbang.c driver
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 as
++ * published by the Free Software Foundation.
++ *
++ */
++
++#include <linux/blkdev.h>
++#include <linux/clk.h>
++#include <linux/delay.h>
++#include <linux/dma-mapping.h>
++#include <linux/err.h>
++#include <linux/errno.h>
++#include <linux/init.h>
++#include <linux/io.h>
++#include <linux/interrupt.h>
++#include <linux/platform_device.h>
++#include <linux/spinlock.h>
++#include <linux/workqueue.h>
++
++#include <linux/spi/spi.h>
++
++#include <mach/hardware.h>
++#include <mach/ep93xx-regs.h>
++#include <asm/gpio.h>
++
++/* #define SPI_EP93XX_DEBUG */
++
++#define DEFINE_SSP_REG(reg, off) \
++ static inline u32 read_##reg(void *p) \
++ { return __raw_readl(p + (off)); } \
++ static inline void write_##reg(u32 v, void *p) \
++ { __raw_writel(v, p + (off)); }
++
++DEFINE_SSP_REG(SSPCR0, 0x00)
++DEFINE_SSP_REG(SSPCR1, 0x04)
++DEFINE_SSP_REG(SSPDR, 0x08)
++DEFINE_SSP_REG(SSPSR, 0x0c)
++DEFINE_SSP_REG(SSPCPSR, 0x10)
++DEFINE_SSP_REG(SSPIIR, 0x14)
++DEFINE_SSP_REG(SSPICR, 0x14)
++
++/* Bits in SSPCR0 */
++#define SSPCR0_DSS_MASK 0x0000000f
++#define SSPCR0_FRF_MASK 0x00000030
++#define SSPCR0_FRF_SHIFT 4
++#define SSPCR0_FRF_MOTOROLA (0 << SSPCR0_FRF_SHIFT)
++#define SSPCR0_FRF_TI (1 << SSPCR0_FRF_SHIFT)
++#define SSPCR0_FRF_NI (2 << SSPCR0_FRF_SHIFT)
++#define SSPCR0_SPO 0x00000040
++#define SSPCR0_SPH 0x00000080
++#define SSPCR0_SCR_MASK 0x0000ff00
++#define SSPCR0_SCR_SHIFT 8
++
++/* Bits in SSPCR1 */
++#define SSPC1_RIE 0x00000001
++#define SSPC1_TIE 0x00000002
++#define SSPC1_RORIE 0x00000004
++#define SSPC1_LBM 0x00000008
++#define SSPC1_SSE 0x00000010
++#define SSPC1_MS 0x00000020
++#define SSPC1_SOD 0x00000040
++
++/* Bits in SSPSR */
++#define SSPSR_TFE 0x00000001 /* TX FIFO is empty */
++#define SSPSR_TNF 0x00000002 /* TX FIFO is not full */
++#define SSPSR_RNE 0x00000004 /* RX FIFO is not empty */
++#define SSPSR_RFF 0x00000008 /* RX FIFO is full */
++#define SSPSR_BSY 0x00000010 /* SSP is busy */
++#define SSPSR_MASK 0x0000001F /* SSP is busy */
++
++/* Bits in SSPCPSR */
++#define SSPCPSR_SCR_MASK 0x000000ff
++
++/* Bits in SSPIIR */
++#define SSPIIR_RIS 0x00000001 /* RX FIFO IRQ status */
++#define SSPIIR_TIS 0x00000002 /* TX FIFO is not full */
++#define SSPIIR_RORIS 0x00000004 /* RX FIFO is full */
++
++#define SPI_SSPCLK 7.4e6
++#define SPI_SSPCLK_REV_E2 14.8e6 /* only for chip Rev E2 */
++#define SPI_MAX_SPEED 3.7e6
++#define SPI_MAX_SPEED_REV_E2 7.4e6 /* only for chip Rev E2 */
++#define SPI_CPSDVR_DIV_MIN 2
++#define SPI_CPSDVR_DIV_MAX 254
++#define SPI_SCR_DIV_MIN 0
++#define SPI_SCR_DIV_MAX 255
++#define SPI_DATARATE_OK 0
++#define SPI_DATARATE_NOK -1
++
++struct driver_data {
++ /* Driver model hookup */
++ struct platform_device *pdev;
++
++ /* SPI framework hookup */
++ struct spi_master *master;
++
++ /* SSP register addresses */
++ void *ioaddr;
++
++ /* SSP irq */
++ int irq;
++
++ struct list_head queue;
++
++ /* SSP spinlock */
++ spinlock_t lock;
++
++ struct workqueue_struct *workqueue;
++ struct work_struct work;
++
++ u8 busy;
++ u8 use_dma;
++};
++
++static unsigned ep93xx_txrx_8(struct spi_device *spi, struct spi_transfer *t)
++{
++ struct driver_data *drv_data;
++ const u8 *tx = t->tx_buf;
++ u8 *rx = t->rx_buf;
++ unsigned count = t->len;
++ u8 byte;
++ int busy;
++
++ drv_data = spi_master_get_devdata(spi->master);
++
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_8: t->len %u \n", t->len);
++#endif
++
++ while (likely(count > 0)) {
++ byte = 0;
++ if (tx) {
++ byte = *tx++;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_8: write 0x%x \n", byte);
++#endif
++ }
++
++ write_SSPDR(byte, drv_data->ioaddr);
++ busy = read_SSPSR(drv_data->ioaddr);
++ while (busy & SSPSR_BSY) {
++ cpu_relax();
++ busy = read_SSPSR(drv_data->ioaddr);
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_8: delay. SSPSR: 0x%X\n", busy);
++#endif
++ }
++ byte = read_SSPDR(drv_data->ioaddr);
++
++ if (rx) {
++ *rx++ = byte;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_8: read 0x%x \n", byte);
++#endif
++ }
++ count -= 1;
++ }
++ return t->len - count;
++}
++
++
++static unsigned ep93xx_txrx_16(struct spi_device *spi, struct spi_transfer *t)
++{
++
++ struct driver_data *drv_data;
++ const u16 *tx = t->tx_buf;
++ u16 *rx = t->rx_buf;
++ unsigned count = t->len;
++ u16 word;
++ int busy;
++
++ drv_data = spi_master_get_devdata(spi->master);
++
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_16: t->len %u \n", t->len);
++#endif
++ while (likely(count > 0)) {
++ word = 0;
++ if (tx) {
++ word = *tx++;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_16: write 0x%x \n", word);
++#endif
++ }
++
++ write_SSPDR(word, drv_data->ioaddr);
++ busy = read_SSPSR(drv_data->ioaddr);
++ while (busy & SSPSR_BSY) {
++ cpu_relax();
++ busy = read_SSPSR(drv_data->ioaddr);
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_8: delay.\n");
++#endif
++ }
++
++ word = read_SSPDR(drv_data->ioaddr);
++
++ if (rx) {
++ *rx++ = word;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "ep93xx_txrx_16: read 0x%x \n", word);
++#endif
++ }
++ count -= 2;
++ }
++ return t->len - count;
++}
++
++static u32 spi_data_rate(u32 speed_hz, u32 *div_cpsdvr, u32 *div_scr,
++ struct driver_data *drv_data, struct spi_device *spi)
++{
++ unsigned int spi_sspclk = SPI_SSPCLK;
++ unsigned int bus_speed_max = SPI_MAX_SPEED;
++ unsigned int bus_hz_tmp = 0;
++ u32 div_cpsdvr_tmp;
++ u32 div_scr_tmp;
++ u32 rv = SPI_DATARATE_NOK;
++ int chip_rev;
++
++ /* Checking CHIP_ID */
++ chip_rev = (__raw_readl (EP93XX_SYSCON_CHIP_ID) >> 28) & 0xF;
++ if (chip_rev == 7)
++ {
++ /* Chip version: Rev E2 */
++ /* This device has double speed SSP clock */
++ spi_sspclk = SPI_SSPCLK_REV_E2;
++ bus_speed_max = SPI_MAX_SPEED_REV_E2;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "Chip Rev E2 detected! This device has double speed SSP clock.\n");
++#endif
++ }
++
++ *div_cpsdvr = SPI_CPSDVR_DIV_MAX;
++ *div_scr = SPI_SCR_DIV_MAX;
++
++ for (div_cpsdvr_tmp = SPI_CPSDVR_DIV_MIN;
++ div_cpsdvr_tmp <= SPI_CPSDVR_DIV_MAX && rv; div_cpsdvr_tmp++) {
++ for (div_scr_tmp = SPI_SCR_DIV_MIN;
++ div_scr_tmp <= SPI_SCR_DIV_MAX && rv; div_scr_tmp++) {
++ bus_hz_tmp = spi_sspclk / (div_cpsdvr_tmp * (1 + div_scr_tmp));
++ if (bus_hz_tmp <= speed_hz && bus_hz_tmp <= bus_speed_max) {
++ *div_cpsdvr = div_cpsdvr_tmp;
++ *div_scr = div_scr_tmp;
++ rv = SPI_DATARATE_OK;
++ }
++ }
++ }
++#ifdef SPI_EP93XX_DEBUG
++ dev_info(&spi->dev,
++ "Needed SPI bus frequency: %i Hz\n", speed_hz);
++ dev_info(&spi->dev,
++ "Actual SPI bus frequency: %i Hz\n", bus_hz_tmp);
++#endif
++ return rv;
++}
++
++/* Supported modes (returns -EINVAL if not supported mode requested) */
++#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
++
++static int ep93xx_spi_setup(struct spi_device *spi)
++{
++ struct driver_data *drv_data;
++ u16 val;
++ u32 div_scr;
++ u32 div_cpsdvr;
++ unsigned int bits = spi->bits_per_word;
++ unsigned long speed_hz = spi->max_speed_hz;
++
++ drv_data = spi_master_get_devdata(spi->master);
++
++ /* enable SSP */
++ write_SSPCR1(SSPC1_SSE, drv_data->ioaddr);
++ /* Enable SSP and loopback mode (only for testing!) */
++ /* write_SSPCR1(SSPC1_SSE | SSPC1_LBM, drv_data->ioaddr); */
++
++ if (bits == 0)
++ bits = 8;
++ if (bits < 4 || bits > 16) {
++ dev_err(&spi->dev,
++ "setup invalid bits_per_word %u (4 to 16)\n", bits);
++ return -EINVAL;
++ } else {
++ val = read_SSPCR0(drv_data->ioaddr);
++ val = val & ~SSPCR0_DSS_MASK ;
++ val = val | (bits-1);
++ write_SSPCR0(val, drv_data->ioaddr);
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "Bits per word: %i\n", bits);
++#endif
++ }
++
++ if (spi->mode & ~MODEBITS) {
++ dev_err(&spi->dev, "unsupported mode bits: %x\n",
++ spi->mode & ~MODEBITS);
++ return -EINVAL;
++ } else {
++ val = read_SSPCR0(drv_data->ioaddr);
++ val = val & ~SSPCR0_SPO;
++ val = val & ~SSPCR0_SPH;
++ if (spi->mode & SPI_CPOL)
++ {
++ val = val | SSPCR0_SPO;
++ }
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "Clock polarity (CPOL): %s\n", (spi->mode & SPI_CPHA) ? "1" : "0");
++#endif
++ if (spi->mode & SPI_CPHA)
++ {
++ val = val | SSPCR0_SPH;
++ }
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "Clock phase (CPHA): %s\n", (spi->mode & SPI_CPHA) ? "1" : "0");
++#endif
++ write_SSPCR0(val, drv_data->ioaddr);
++ }
++
++ if (SPI_DATARATE_OK == (spi_data_rate(speed_hz, &div_cpsdvr,
++ &div_scr, drv_data, spi))) {
++
++ val = read_SSPCPSR(drv_data->ioaddr);
++ val = val & ~SSPCPSR_SCR_MASK;
++ val = val | div_cpsdvr;
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "SSPCPSR: 0x%X\n", val);
++#endif
++ write_SSPCPSR(val, drv_data->ioaddr);
++
++ val = read_SSPCR0(drv_data->ioaddr);
++ val = val & ~SSPCR0_SCR_MASK;
++ val = val | (div_scr << SSPCR0_SCR_SHIFT);
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "SSPCR0: 0x%X (div_scr: 0x%X)\n", val, div_scr);
++#endif
++ write_SSPCR0(val, drv_data->ioaddr);
++ } else
++ return -EINVAL;
++
++ /* reenable */
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val & ~SSPC1_SSE;
++ write_SSPCR1(val, drv_data->ioaddr);
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val | SSPC1_SSE;
++ write_SSPCR1(val, drv_data->ioaddr);
++#ifdef SPI_EP93XX_DEBUG
++ dev_info (&spi->dev, "Loopback mode: %s\n", (val & SSPC1_LBM) ? "On" : "Off");
++#endif
++
++ return 0;
++}
++
++static int ep93xx_spi_transfer(struct spi_device *spi, struct spi_message *m)
++{
++ struct driver_data *drv_data;
++ unsigned long flags;
++ int status = 0;
++
++ m->actual_length = 0;
++ m->status = -EINPROGRESS;
++
++ drv_data = spi_master_get_devdata(spi->master);
++
++ spin_lock_irqsave(&drv_data->lock, flags);
++ if (!spi->max_speed_hz)
++ status = -ENETDOWN;
++ else {
++ list_add_tail(&m->queue, &drv_data->queue);
++ queue_work(drv_data->workqueue, &drv_data->work);
++ }
++ spin_unlock_irqrestore(&drv_data->lock, flags);
++ return status;
++}
++
++static void ep93xx_work(struct work_struct *work)
++{
++ struct driver_data *drv_data =
++ container_of(work, struct driver_data, work);
++ unsigned long flags;
++
++ spin_lock_irqsave(&drv_data->lock, flags);
++ drv_data->busy = 1;
++
++ while (!list_empty(&drv_data->queue)) {
++ struct spi_message *m;
++ struct spi_device *spi;
++ struct spi_transfer *t = NULL;
++ int status;
++
++ m = container_of(drv_data->queue.next, struct spi_message,
++ queue);
++ list_del_init(&m->queue);
++ spin_unlock_irqrestore(&drv_data->lock, flags);
++
++ spi = m->spi;
++ status = 0;
++
++ list_for_each_entry(t, &m->transfers, transfer_list) {
++
++ if (!t->tx_buf && !t->rx_buf && t->len) {
++ status = -EINVAL;
++ break;
++ }
++
++ if (t->len) {
++ if (!m->is_dma_mapped) {
++ t->rx_dma = 0;
++ t->tx_dma = 0;
++ }
++ if (t->bits_per_word <= 8)
++ status = ep93xx_txrx_8(spi, t);
++ else
++ status = ep93xx_txrx_16(spi, t);
++ }
++
++ if (status != t->len) {
++ if (status > 0)
++ status = -EMSGSIZE;
++ break;
++ }
++ m->actual_length += status;
++ status = 0;
++
++ /* protocol tweaks before next transfer */
++ if (t->delay_usecs)
++ udelay(t->delay_usecs);
++
++ if (t->transfer_list.next == &m->transfers)
++ break;
++ }
++
++ m->status = status;
++ m->complete(m->context);
++
++ spin_lock_irqsave(&drv_data->lock, flags);
++ }
++ drv_data->busy = 0;
++ spin_unlock_irqrestore(&drv_data->lock, flags);
++}
++
++static irqreturn_t ssp_int(int irq, void *dev_id)
++{
++ struct driver_data *drv_data = dev_id;
++ u8 status;
++ status = read_SSPIIR(drv_data->ioaddr);
++
++ if (status & SSPIIR_RORIS) {
++ dev_err(&drv_data->pdev->dev, "SPI rx overrun.\n");
++
++ /* We clear the overrun here ! */
++ write_SSPICR(0, drv_data->ioaddr);
++ }
++
++ /* RX interrupt */
++ if (status & SSPIIR_RIS)
++ dev_info(&drv_data->pdev->dev, "SPI RX interrupt\n");
++
++ /* TX interrupt */
++ if (status & SSPIIR_TIS)
++ dev_info(&drv_data->pdev->dev, "SPI TX interrupt\n");
++
++ write_SSPICR(0, drv_data->ioaddr);
++ return IRQ_HANDLED;
++}
++
++static int __init ep93xx_spi_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct spi_master *master;
++ struct driver_data *drv_data = 0;
++ struct resource *memory_resource;
++ int status = 0;
++ u16 val;
++
++ /* Allocate master with space for drv_data and null dma buffer */
++ master = spi_alloc_master(dev, sizeof(struct driver_data));
++ if (!master) {
++ dev_err(&pdev->dev, "cannot alloc spi_master\n");
++ return -ENOMEM;
++ }
++ drv_data = spi_master_get_devdata(master);
++ drv_data->master = master;
++ drv_data->pdev = pdev;
++
++ master->num_chipselect = EP93XX_GPIO_LINE_H(7) + 1;
++ master->bus_num = pdev->id;
++ master->setup = ep93xx_spi_setup;
++ master->transfer = ep93xx_spi_transfer;
++
++ spin_lock_init(&drv_data->lock);
++ INIT_LIST_HEAD(&drv_data->queue);
++
++ /* Setup register addresses */
++ memory_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (!memory_resource) {
++ dev_err(&pdev->dev, "memory resources not defined\n");
++ status = -EIO;
++ goto out_error_master_alloc;
++ } else {
++ drv_data->ioaddr = ioremap(memory_resource->start,
++ memory_resource->end - memory_resource->start);
++ if (drv_data->ioaddr == NULL) {
++ dev_err(&pdev->dev, "ioremap failed\n");
++ status = -EIO;
++ goto out_error_master_alloc;
++ }
++ }
++
++ /* Attach to IRQ */
++ drv_data->irq = platform_get_irq(pdev, 0);
++ if (drv_data->irq < 0)
++ return drv_data->irq;
++
++ if (drv_data->irq <= 0) {
++ dev_err(&pdev->dev, "IRQ resource not defined\n");
++ status = -ENODEV;
++ goto out_error_master_alloc;
++ }
++
++ status = request_irq(drv_data->irq, ssp_int, 0, "ep93xx-spi", drv_data);
++ if (status < 0) {
++ dev_err(&pdev->dev, "cannot get SPI IRQ 0\n");
++ goto out_error_master_alloc;
++ }
++
++ /* SSP default configuration, enable */
++ write_SSPCR1(SSPC1_SSE, drv_data->ioaddr);
++
++ /* run as master */
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val & ~SSPC1_MS;
++ write_SSPCR1(val, drv_data->ioaddr);
++
++ /* frame format to Motorola SPI Format */
++ val = read_SSPCR0(drv_data->ioaddr);
++ val = val & ~SSPCR0_FRF_MASK ;
++ val = val | SSPCR0_FRF_MOTOROLA;
++ write_SSPCR0(val, drv_data->ioaddr);
++
++ /* enable interrupts */
++ val = read_SSPCR1(drv_data->ioaddr);
++ /* for now only overrun is handled */
++ /* val = val | SSPC1_RIE | SSPC1_TIE | SSPC1_RORIE; */
++ val = val | SSPC1_RORIE;
++ write_SSPCR1(val, drv_data->ioaddr);
++
++ /* SSP default configuration, re enable */
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val & ~SSPC1_SSE;
++ write_SSPCR1(val, drv_data->ioaddr);
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val | SSPC1_SSE;
++ write_SSPCR1(val, drv_data->ioaddr);
++
++ /* Register with the SPI framework */
++ platform_set_drvdata(pdev, drv_data);
++ status = spi_register_master(master);
++ if (status != 0) {
++ dev_err(&pdev->dev, "cannot register SPI master\n");
++ goto out_error_master_alloc;
++ } else
++ dev_info(&pdev->dev, "SPI Controller initalized\n");
++
++ INIT_WORK(&drv_data->work, ep93xx_work);
++ spin_lock_init(&drv_data->lock);
++ INIT_LIST_HEAD(&drv_data->queue);
++
++ /* this task is the only thing to touch the SPI bits */
++ drv_data->busy = 0;
++ drv_data->workqueue = create_singlethread_workqueue(
++ dev_name(drv_data->master->dev.parent));
++/* drv_data->master->cdev.dev->bus_id); */
++ if (drv_data->workqueue == NULL) {
++ status = -EBUSY;
++ goto out_error_free_irq;
++ }
++
++ return status;
++
++out_error_free_irq:
++ free_irq(drv_data->irq, master);
++out_error_master_alloc:
++ if (drv_data->ioaddr != NULL)
++ iounmap(drv_data->ioaddr);
++ spi_master_put(master);
++ return status;
++}
++
++static int __exit ep93xx_spi_remove(struct platform_device *pdev)
++{
++ struct driver_data *drv_data = platform_get_drvdata(pdev);
++ u8 val;
++
++ WARN_ON(!list_empty(&drv_data->queue));
++
++ destroy_workqueue(drv_data->workqueue);
++
++ /* switch off SSP*/
++ val = read_SSPCR1(drv_data->ioaddr);
++ val = val & ~SSPC1_SSE;
++ write_SSPCR1(val, drv_data->ioaddr);
++
++ /* release irqs */
++ if (drv_data->irq > 0)
++ free_irq(drv_data->irq, drv_data);
++
++ /* Disconnect from the SPI framework */
++ spi_unregister_master(drv_data->master);
++ spi_master_put(drv_data->master);
++
++ if (drv_data->ioaddr != NULL)
++ iounmap(drv_data->ioaddr);
++
++ /* Prevent double remove */
++ platform_set_drvdata(pdev, NULL);
++ return 0;
++}
++
++#ifdef CONFIG_PM
++static int ep93xx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
++{
++ return 0;
++}
++
++static int ep93xx_spi_resume(struct platform_device *pdev)
++{
++ return 0;
++}
++
++#else
++#define ep93xx_spi_suspend NULL
++#define ep93xx_spi_resume NULL
++#endif
++
++struct platform_driver ep93xx_spi_device = {
++ .remove = __exit_p(ep93xx_spi_remove),
++#ifdef CONFIG_PM
++ .suspend = ep93xx_spi_suspend,
++ .resume = ep93xx_spi_resume,
++#endif
++ .driver = {
++ .name = "ep93xx-spi",
++ .bus = &spi_bus_type,
++ .owner = THIS_MODULE,
++ },
++};
++
++int __init ep93xx_spi_init(void)
++{
++ return platform_driver_probe(&ep93xx_spi_device, ep93xx_spi_probe);
++}
++
++void __exit ep93xx_spi_exit(void)
++{
++ platform_driver_unregister(&ep93xx_spi_device);
++}
++
++module_init(ep93xx_spi_init);
++module_exit(ep93xx_spi_exit);
++
++MODULE_DESCRIPTION("EP93XX SPI Driver");
++MODULE_AUTHOR("Manfred Gruber, <m.gruber@tirol.com>");
++MODULE_LICENSE("GPL");
generated by cgit v1.1 at 2024-11-23 08:36:54 +0000