diff options
Diffstat (limited to 'drivers/spi/mpc52xx_psc_spi.c')
| -rw-r--r-- | drivers/spi/mpc52xx_psc_spi.c | 598 |
1 files changed, 0 insertions, 598 deletions
diff --git a/drivers/spi/mpc52xx_psc_spi.c b/drivers/spi/mpc52xx_psc_spi.c deleted file mode 100644 index a86315a0c5b..00000000000 --- a/drivers/spi/mpc52xx_psc_spi.c +++ /dev/null @@ -1,598 +0,0 @@ -/* - * 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> - -#if defined(CONFIG_PPC_MERGE) -#include <asm/of_platform.h> -#else -#include <linux/platform_device.h> -#endif - -#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; - struct mpc52xx_psc_fifo __iomem *fifo; - unsigned int irq; - 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 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 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 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; - struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo; - 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 interrupts 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(&fifo->rfalarm, rfalarm); - } - out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY); - wait_for_completion(&mps->done); - recv_at_once = in_be16(&fifo->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); -} - -/* the spi->mode bits understood by this driver: */ -#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST) - -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 (spi->mode & ~MODEBITS) { - dev_dbg(&spi->dev, "setup: unsupported mode bits %x\n", - spi->mode & ~MODEBITS); - 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) -{ - kfree(spi->controller_state); -} - -static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps) -{ - struct mpc52xx_psc __iomem *psc = mps->psc; - struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo; - u32 mclken_div; - int ret = 0; - - /* default sysclk is 512MHz */ - mclken_div = (mps->sysclk ? mps->sysclk : 512000000) / MCLK; - mpc52xx_set_psc_clkdiv(psc_id, mclken_div); - - /* 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(&fifo->rfcntl, 0); - out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL); - - /* Configure 8bit codec mode as a 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; - - 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; -} - -/* bus_num is used only for the case dev->platform_data == NULL */ -static int __init mpc52xx_psc_spi_do_probe(struct device *dev, u32 regaddr, - u32 size, unsigned int irq, s16 bus_num) -{ - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct mpc52xx_psc_spi *mps; - struct spi_master *master; - int ret; - - master = spi_alloc_master(dev, sizeof *mps); - if (master == NULL) - return -ENOMEM; - - dev_set_drvdata(dev, master); - mps = spi_master_get_devdata(master); - - mps->irq = irq; - if (pdata == NULL) { - dev_warn(dev, "probe called without platform data, no " - "(de)activate_cs function will be called\n"); - mps->activate_cs = NULL; - mps->deactivate_cs = NULL; - mps->sysclk = 0; - master->bus_num = bus_num; - master->num_chipselect = 255; - } else { - mps->activate_cs = pdata->activate_cs; - mps->deactivate_cs = pdata->deactivate_cs; - mps->sysclk = pdata->sysclk; - master->bus_num = 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; - - mps->psc = ioremap(regaddr, size); - if (!mps->psc) { - dev_err(dev, "could not ioremap I/O port range\n"); - ret = -EFAULT; - goto free_master; - } - /* On the 5200, fifo regs are immediately ajacent to the psc regs */ - mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc); - - ret = request_irq(mps->irq, mpc52xx_psc_spi_isr, 0, "mpc52xx-psc-spi", - mps); - if (ret) - goto free_master; - - ret = mpc52xx_psc_spi_port_config(master->bus_num, mps); - if (ret < 0) - goto free_irq; - - 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->dev.parent->bus_id); - if (mps->workqueue == NULL) { - ret = -EBUSY; - goto free_irq; - } - - ret = spi_register_master(master); - if (ret < 0) - goto unreg_master; - - return ret; - -unreg_master: - destroy_workqueue(mps->workqueue); -free_irq: - free_irq(mps->irq, mps); -free_master: - if (mps->psc) - iounmap(mps->psc); - spi_master_put(master); - - return ret; -} - -static int __exit mpc52xx_psc_spi_do_remove(struct device *dev) -{ - struct spi_master *master = dev_get_drvdata(dev); - struct mpc52xx_psc_spi *mps = spi_master_get_devdata(master); - - flush_workqueue(mps->workqueue); - destroy_workqueue(mps->workqueue); - spi_unregister_master(master); - free_irq(mps->irq, mps); - if (mps->psc) - iounmap(mps->psc); - - return 0; -} - -#if !defined(CONFIG_PPC_MERGE) -static int __init mpc52xx_psc_spi_probe(struct platform_device *dev) -{ - switch(dev->id) { - case 1: - case 2: - case 3: - case 6: - return mpc52xx_psc_spi_do_probe(&dev->dev, - MPC52xx_PA(MPC52xx_PSCx_OFFSET(dev->id)), - MPC52xx_PSC_SIZE, platform_get_irq(dev, 0), dev->id); - default: - return -EINVAL; - } -} - -static int __exit mpc52xx_psc_spi_remove(struct platform_device *dev) -{ - return mpc52xx_psc_spi_do_remove(&dev->dev); -} - -static struct platform_driver mpc52xx_psc_spi_platform_driver = { - .remove = __exit_p(mpc52xx_psc_spi_remove), - .driver = { - .name = "mpc52xx-psc-spi", - .owner = THIS_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); - -#else /* defined(CONFIG_PPC_MERGE) */ - -static int __init mpc52xx_psc_spi_of_probe(struct of_device *op, - const struct of_device_id *match) -{ - const u32 *regaddr_p; - u64 regaddr64, size64; - s16 id = -1; - - regaddr_p = of_get_address(op->node, 0, &size64, NULL); - if (!regaddr_p) { - printk(KERN_ERR "Invalid PSC address\n"); - return -EINVAL; - } - regaddr64 = of_translate_address(op->node, regaddr_p); - - /* get PSC id (1..6, used by port_config) */ - if (op->dev.platform_data == NULL) { - const u32 *psc_nump; - - psc_nump = of_get_property(op->node, "cell-index", NULL); - if (!psc_nump || *psc_nump > 5) { - printk(KERN_ERR "mpc52xx_psc_spi: Device node %s has invalid " - "cell-index property\n", op->node->full_name); - return -EINVAL; - } - id = *psc_nump + 1; - } - - return mpc52xx_psc_spi_do_probe(&op->dev, (u32)regaddr64, (u32)size64, - irq_of_parse_and_map(op->node, 0), id); -} - -static int __exit mpc52xx_psc_spi_of_remove(struct of_device *op) -{ - return mpc52xx_psc_spi_do_remove(&op->dev); -} - -static struct of_device_id mpc52xx_psc_spi_of_match[] = { - { .compatible = "fsl,mpc5200-psc-spi", }, - { .compatible = "mpc5200-psc-spi", }, /* old */ - {} -}; - -MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match); - -static struct of_platform_driver mpc52xx_psc_spi_of_driver = { - .owner = THIS_MODULE, - .name = "mpc52xx-psc-spi", - .match_table = mpc52xx_psc_spi_of_match, - .probe = mpc52xx_psc_spi_of_probe, - .remove = __exit_p(mpc52xx_psc_spi_of_remove), - .driver = { - .name = "mpc52xx-psc-spi", - .owner = THIS_MODULE, - }, -}; - -static int __init mpc52xx_psc_spi_init(void) -{ - return of_register_platform_driver(&mpc52xx_psc_spi_of_driver); -} -module_init(mpc52xx_psc_spi_init); - -static void __exit mpc52xx_psc_spi_exit(void) -{ - of_unregister_platform_driver(&mpc52xx_psc_spi_of_driver); -} -module_exit(mpc52xx_psc_spi_exit); - -#endif /* defined(CONFIG_PPC_MERGE) */ - -MODULE_AUTHOR("Dragos Carp"); -MODULE_DESCRIPTION("MPC52xx PSC SPI Driver"); -MODULE_LICENSE("GPL"); |