The patch titled
MPC52xx PSC SPI master driver
has been added to the -mm tree. Its filename is
mpc52xx-psc-spi-master-driver.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: MPC52xx PSC SPI master driver
From: Dragos Carp <dragos.carp@xxxxxxxxxxx>
SPI master driver for MPC52xx using its Programmable Serial Controller.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/spi/Kconfig | 7
drivers/spi/Makefile | 1
drivers/spi/mpc52xx_psc_spi.c | 542 ++++++++++++++++++++++++++++++++
3 files changed, 550 insertions(+)
diff -puN drivers/spi/Kconfig~mpc52xx-psc-spi-master-driver drivers/spi/Kconfig
--- a/drivers/spi/Kconfig~mpc52xx-psc-spi-master-driver
+++ a/drivers/spi/Kconfig
@@ -89,6 +89,13 @@ config SPI_IMX
This enables using the Freescale iMX SPI controller in master
mode.
+config SPI_MPC52xx_PSC
+ tristate "Freescale MPC52xx PSC SPI controller"
+ depends on SPI_MASTER && PPC_MPC52xx && EXPERIMENTAL
+ help
+ This enables using the Freescale MPC52xx Programmable Serial
+ Controller in master SPI mode.
+
config SPI_MPC83xx
tristate "Freescale MPC83xx SPI controller"
depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL
diff -puN drivers/spi/Makefile~mpc52xx-psc-spi-master-driver drivers/spi/Makefile
--- a/drivers/spi/Makefile~mpc52xx-psc-spi-master-driver
+++ a/drivers/spi/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_SPI_BUTTERFLY) += spi_butt
obj-$(CONFIG_SPI_IMX) += spi_imx.o
obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o
obj-$(CONFIG_SPI_OMAP_UWIRE) += omap_uwire.o
+obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o
obj-$(CONFIG_SPI_MPC83xx) += spi_mpc83xx.o
obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o
obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
diff -puN /dev/null drivers/spi/mpc52xx_psc_spi.c
--- /dev/null
+++ a/drivers/spi/mpc52xx_psc_spi.c
@@ -0,0 +1,542 @@
+/*
+ * MPC52xx SPC in SPI mode driver.
+ *
+ * Maintainer: Dragos Carp
+ *
+ * Copyright (C) 2006 TOPTICA Photonics AG.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+#include <linux/fsl_devices.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+
+#define MCLK 20000000 /* PSC port MClk in hz */
+
+struct mpc52xx_psc_spi {
+ /* fsl_spi_platform data */
+ void (*activate_cs)(u8, u8);
+ void (*deactivate_cs)(u8, u8);
+ u32 sysclk;
+
+ /* driver internal data */
+ struct mpc52xx_psc __iomem *psc;
+ u8 bits_per_word;
+ u8 busy;
+
+ struct workqueue_struct *workqueue;
+ struct work_struct work;
+
+ struct list_head queue;
+ spinlock_t lock;
+
+ struct completion done;
+};
+
+/* controller state */
+struct mpc52xx_psc_spi_cs {
+ int bits_per_word;
+ int speed_hz;
+};
+
+/* set clock freq, clock ramp, bits per work
+ * if t is NULL then reset the values to the default values
+ */
+static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+
+ cs->speed_hz = (t && t->speed_hz)
+ ? t->speed_hz : spi->max_speed_hz;
+ cs->bits_per_word = (t && t->bits_per_word)
+ ? t->bits_per_word : spi->bits_per_word;
+ cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
+ return 0;
+}
+
+static inline void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
+{
+ struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+ u32 sicr;
+ u16 ccr;
+
+ sicr = in_be32(&psc->sicr);
+
+ /* Set clock phase and polarity */
+ if (spi->mode & SPI_CPHA)
+ sicr |= 0x00001000;
+ else
+ sicr &= ~0x00001000;
+ if (spi->mode & SPI_CPOL)
+ sicr |= 0x00002000;
+ else
+ sicr &= ~0x00002000;
+
+ if (spi->mode & SPI_LSB_FIRST)
+ sicr |= 0x10000000;
+ else
+ sicr &= ~0x10000000;
+ out_be32(&psc->sicr, sicr);
+
+ /* Set clock frequency and bits per word
+ * Because psc->ccr is defined as 16bit register instead of 32bit
+ * just set the lower byte of BitClkDiv
+ */
+ ccr = in_be16(&psc->ccr);
+ ccr &= 0xFF00;
+ if (cs->speed_hz)
+ ccr |= (MCLK / cs->speed_hz - 1) & 0xFF;
+ else /* by default SPI Clk 1MHz */
+ ccr |= (MCLK / 1000000 - 1) & 0xFF;
+ out_be16(&psc->ccr, ccr);
+ mps->bits_per_word = cs->bits_per_word;
+
+ if (mps->activate_cs)
+ mps->activate_cs(spi->chip_select,
+ (spi->mode & SPI_CS_HIGH) ? 1 : 0);
+}
+
+static inline void mpc52xx_psc_spi_deactivate_cs(struct spi_device *spi)
+{
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+
+ if (mps->deactivate_cs)
+ mps->deactivate_cs(spi->chip_select,
+ (spi->mode & SPI_CS_HIGH) ? 1 : 0);
+}
+
+#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
+/* wake up when 80% fifo full */
+#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
+
+static inline int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+ unsigned rb = 0; /* number of bytes receieved */
+ unsigned sb = 0; /* number of bytes sent */
+ unsigned char *rx_buf = (unsigned char *)t->rx_buf;
+ unsigned char *tx_buf = (unsigned char *)t->tx_buf;
+ unsigned rfalarm;
+ unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
+ unsigned recv_at_once;
+ unsigned bpw = mps->bits_per_word / 8;
+
+ if (!t->tx_buf && !t->rx_buf && t->len)
+ return -EINVAL;
+
+ /* enable transmiter/receiver */
+ out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
+ while (rb < t->len) {
+ if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
+ rfalarm = MPC52xx_PSC_RFALARM;
+ } else {
+ send_at_once = t->len - sb;
+ rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
+ }
+
+ dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
+ if (tx_buf) {
+ for (; send_at_once; sb++, send_at_once--) {
+ /* set EOF flag */
+ if (mps->bits_per_word
+ && (sb + 1) % bpw == 0)
+ out_8(&psc->ircr2, 0x01);
+ out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
+ }
+ } else {
+ for (; send_at_once; sb++, send_at_once--) {
+ /* set EOF flag */
+ if (mps->bits_per_word
+ && ((sb + 1) % bpw) == 0)
+ out_8(&psc->ircr2, 0x01);
+ out_8(&psc->mpc52xx_psc_buffer_8, 0);
+ }
+ }
+
+
+ /* enable interupts and wait for wake up
+ * if just one byte is expected the Rx FIFO genererates no
+ * FFULL interrupt, so activate the RxRDY interrupt
+ */
+ out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+ if (t->len - rb == 1) {
+ out_8(&psc->mode, 0);
+ } else {
+ out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
+ out_be16(&psc->rfalarm, rfalarm);
+ }
+ out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
+ wait_for_completion(&mps->done);
+ recv_at_once = in_be16(&psc->rfnum);
+ dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
+
+ send_at_once = recv_at_once;
+ if (rx_buf) {
+ for (; recv_at_once; rb++, recv_at_once--)
+ rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
+ } else {
+ for (; recv_at_once; rb++, recv_at_once--)
+ in_8(&psc->mpc52xx_psc_buffer_8);
+ }
+ }
+ /* disable transmiter/receiver */
+ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+
+ return 0;
+}
+
+static void mpc52xx_psc_spi_work(struct work_struct *work)
+{
+ struct mpc52xx_psc_spi *mps =
+ container_of(work, struct mpc52xx_psc_spi, work);
+
+ spin_lock_irq(&mps->lock);
+ mps->busy = 1;
+ while (!list_empty(&mps->queue)) {
+ struct spi_message *m;
+ struct spi_device *spi;
+ struct spi_transfer *t = NULL;
+ unsigned cs_change;
+ int status;
+
+ m = container_of(mps->queue.next, struct spi_message, queue);
+ list_del_init(&m->queue);
+ spin_unlock_irq(&mps->lock);
+
+ spi = m->spi;
+ cs_change = 1;
+ status = 0;
+ list_for_each_entry (t, &m->transfers, transfer_list) {
+ if (t->bits_per_word || t->speed_hz) {
+ status = mpc52xx_psc_spi_transfer_setup(spi, t);
+ if (status < 0)
+ break;
+ }
+
+ if (cs_change)
+ mpc52xx_psc_spi_activate_cs(spi);
+ cs_change = t->cs_change;
+
+ status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
+ if (status)
+ break;
+ m->actual_length += t->len;
+
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
+
+ if (cs_change)
+ mpc52xx_psc_spi_deactivate_cs(spi);
+ }
+
+ m->status = status;
+ m->complete(m->context);
+
+ if (status || !cs_change)
+ mpc52xx_psc_spi_deactivate_cs(spi);
+
+ mpc52xx_psc_spi_transfer_setup(spi, NULL);
+
+ spin_lock_irq(&mps->lock);
+ }
+ mps->busy = 0;
+ spin_unlock_irq(&mps->lock);
+}
+
+static int mpc52xx_psc_spi_setup(struct spi_device *spi)
+{
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+ struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+ unsigned long flags;
+
+ if (spi->bits_per_word%8)
+ return -EINVAL;
+
+ if (!cs) {
+ cs = kzalloc(sizeof *cs, GFP_KERNEL);
+ if (!cs)
+ return -ENOMEM;
+ spi->controller_state = cs;
+ }
+
+ cs->bits_per_word = spi->bits_per_word;
+ cs->speed_hz = spi->max_speed_hz;
+
+ spin_lock_irqsave(&mps->lock, flags);
+ if (!mps->busy)
+ mpc52xx_psc_spi_deactivate_cs(spi);
+ spin_unlock_irqrestore(&mps->lock, flags);
+
+ return 0;
+}
+
+static int mpc52xx_psc_spi_transfer(struct spi_device *spi,
+ struct spi_message *m)
+{
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+ unsigned long flags;
+
+ m->actual_length = 0;
+ m->status = -EINPROGRESS;
+
+ spin_lock_irqsave(&mps->lock, flags);
+ list_add_tail(&m->queue, &mps->queue);
+ queue_work(mps->workqueue, &mps->work);
+ spin_unlock_irqrestore(&mps->lock, flags);
+
+ return 0;
+}
+
+static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
+{
+ if (spi->controller_state)
+ kfree(spi->controller_state);
+}
+
+static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
+{
+ struct mpc52xx_cdm __iomem *cdm;
+ struct mpc52xx_gpio __iomem *gpio;
+ struct mpc52xx_psc __iomem *psc;
+ u32 ul;
+ u32 mclken_div;
+ int ret = 0;
+
+ cdm = ioremap(MPC52xx_PA(MPC52xx_CDM_OFFSET), MPC52xx_CDM_SIZE);
+ gpio = ioremap(MPC52xx_PA(MPC52xx_GPIO_OFFSET), MPC52xx_GPIO_SIZE);
+ if (!cdm || !gpio) {
+ printk(KERN_ERR "Error mapping CDM/GPIO\n");
+ ret = -EFAULT;
+ goto unmap_regs;
+ }
+
+ /* default sysclk is 512MHz */
+ mclken_div = 0x8000 |
+ (((mps->sysclk ? mps->sysclk : 512000000) / MCLK) & 0x1FF);
+
+ switch (psc_id) {
+ case 1:
+ ul = in_be32(&gpio->port_config);
+ ul &= 0xFFFFFFF8;
+ ul |= 0x00000006;
+ out_be32(&gpio->port_config, ul);
+ out_be16(&cdm->mclken_div_psc1, mclken_div);
+ ul = in_be32(&cdm->clk_enables);
+ ul |= 0x00000020;
+ out_be32(&cdm->clk_enables, ul);
+ break;
+ case 2:
+ ul = in_be32(&gpio->port_config);
+ ul &= 0xFFFFFF8F;
+ ul |= 0x00000060;
+ out_be32(&gpio->port_config, ul);
+ out_be16(&cdm->mclken_div_psc2, mclken_div);
+ ul = in_be32(&cdm->clk_enables);
+ ul |= 0x00000040;
+ out_be32(&cdm->clk_enables, ul);
+ break;
+ case 3:
+ ul = in_be32(&gpio->port_config);
+ ul &= 0xFFFFF0FF;
+ ul |= 0x00000600;
+ out_be32(&gpio->port_config, ul);
+ out_be16(&cdm->mclken_div_psc3, mclken_div);
+ ul = in_be32(&cdm->clk_enables);
+ ul |= 0x00000080;
+ out_be32(&cdm->clk_enables, ul);
+ break;
+ case 6:
+ ul = in_be32(&gpio->port_config);
+ ul &= 0xFF8FFFFF;
+ ul |= 0x00700000;
+ out_be32(&gpio->port_config, ul);
+ out_be16(&cdm->mclken_div_psc6, mclken_div);
+ ul = in_be32(&cdm->clk_enables);
+ ul |= 0x00000010;
+ out_be32(&cdm->clk_enables, ul);
+ break;
+ default:
+ ret = -EINVAL;
+ goto unmap_regs;
+ }
+ psc = ioremap(MPC52xx_PA(MPC52xx_PSCx_OFFSET(psc_id)),
+ MPC52xx_PSC_SIZE);
+ if (!psc) {
+ printk(KERN_ERR "Error mapping PSC%d\n", psc_id);
+ ret = -EFAULT;
+ goto unmap_regs;
+ }
+ mps->psc = psc;
+
+ /* Reset the PSC into a known state */
+ out_8(&psc->command, MPC52xx_PSC_RST_RX);
+ out_8(&psc->command, MPC52xx_PSC_RST_TX);
+ out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+
+ /* Disable interrupts, interrupts are based on alarm level */
+ out_be16(&psc->mpc52xx_psc_imr, 0);
+ out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+ out_8(&psc->rfcntl, 0);
+ out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
+
+ /* Configure 8bit codec mode as an SPI master and use EOF flags */
+ /* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
+ out_be32(&psc->sicr, 0x0180C800);
+ out_be16(&psc->ccr, 0x070F); /* by default SPI Clk 1MHz */
+
+ /* Set 2ms DTL delay */
+ out_8(&psc->ctur, 0x00);
+ out_8(&psc->ctlr, 0x84);
+
+ mps->bits_per_word = 8;
+
+unmap_regs:
+ if (cdm) iounmap(cdm);
+ if (gpio) iounmap(gpio);
+
+ return ret;
+}
+
+static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
+{
+ struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
+ struct mpc52xx_psc __iomem *psc = mps->psc;
+
+ /* disable interrupt and wake up the work queue */
+ if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
+ out_be16(&psc->mpc52xx_psc_imr, 0);
+ complete(&mps->done);
+ return IRQ_HANDLED;
+ }
+ return IRQ_NONE;
+}
+
+static int __init mpc52xx_psc_spi_probe(struct platform_device *dev)
+{
+ struct fsl_spi_platform_data *pdata = dev->dev.platform_data;
+ struct mpc52xx_psc_spi *mps;
+ struct spi_master *master;
+ unsigned int irq = platform_get_irq(dev, 0);
+ int ret;
+
+ if (pdata == NULL)
+ return -ENODEV;
+
+ master = spi_alloc_master(&dev->dev, sizeof *mps);
+ if (master == NULL)
+ return -ENOMEM;
+
+ platform_set_drvdata(dev, master);
+
+ mps = spi_master_get_devdata(master);
+ mps->activate_cs = pdata->activate_cs;
+ mps->deactivate_cs = pdata->deactivate_cs;
+ mps->sysclk = pdata->sysclk;
+
+ master->bus_num = dev->id = pdata->bus_num;
+ master->num_chipselect = pdata->max_chipselect;
+ master->setup = mpc52xx_psc_spi_setup;
+ master->transfer = mpc52xx_psc_spi_transfer;
+ master->cleanup = mpc52xx_psc_spi_cleanup;
+
+ ret = mpc52xx_psc_spi_port_config(dev->id, mps);
+ if (ret < 0)
+ goto free_master;
+
+ ret = request_irq(irq, mpc52xx_psc_spi_isr, 0, "mpc52xx_psc_spi", mps);
+ if (ret)
+ goto free_master;
+
+ spin_lock_init(&mps->lock);
+ init_completion(&mps->done);
+ INIT_WORK(&mps->work, mpc52xx_psc_spi_work);
+ INIT_LIST_HEAD(&mps->queue);
+
+ mps->workqueue = create_singlethread_workqueue(
+ master->cdev.dev->bus_id);
+ if (mps->workqueue == NULL) {
+ ret = -EBUSY;
+ goto err_workq;
+ }
+
+ ret = spi_register_master(master);
+ if (ret < 0)
+ goto unreg_master;
+
+ return ret;
+
+unreg_master:
+ destroy_workqueue(mps->workqueue);
+err_workq:
+ free_irq(irq, mps);
+free_master:
+ if (mps->psc) iounmap(mps->psc);
+ spi_master_put(master);
+
+ return ret;
+}
+
+static int __exit mpc52xx_psc_spi_remove(struct platform_device *dev)
+{
+ struct spi_master *master = platform_get_drvdata(dev);
+ struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master);
+ unsigned int irq = platform_get_irq(dev, 0);
+
+ flush_workqueue(mps->workqueue);
+ destroy_workqueue(mps->workqueue);
+ spi_unregister_master(master);
+ free_irq(irq, mps);
+ if (mps->psc) iounmap(mps->psc);
+
+ return 0;
+}
+
+static struct platform_driver mpc52xx_psc_spi_platform_driver = {
+ .remove = __exit_p(mpc52xx_psc_spi_remove),
+ .driver = {
+ .name = "mpc52xx_psc_spi",
+ .owner = THIS_MODULE,
+ },
+};
+
+
+/* ======================================================================== */
+/* Module */
+/* ======================================================================== */
+
+static int __init mpc52xx_psc_spi_init(void)
+{
+ return platform_driver_probe(&mpc52xx_psc_spi_platform_driver,
+ mpc52xx_psc_spi_probe);
+}
+module_init(mpc52xx_psc_spi_init);
+
+static void __exit mpc52xx_psc_spi_exit(void)
+{
+ platform_driver_unregister(&mpc52xx_psc_spi_platform_driver);
+}
+module_exit(mpc52xx_psc_spi_exit);
+
+MODULE_AUTHOR("Dragos Carp");
+MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
+MODULE_LICENSE("GPL");
_
Patches currently in -mm which might be from dragos.carp@xxxxxxxxxxx are
mpc52xx-psc-spi-master-driver.patch
mpc52xx-psc-spi-master-driver-update.patch
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