From: Anton Vorontsov Date: Thu, 18 Jun 2009 23:49:08 +0000 (-0700) Subject: spi_mpc83xx: rename spi_83xx.c to spi_8xxx.c X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=34a661a1fe02840b6fc8de0a616464dd4899782f;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git spi_mpc83xx: rename spi_83xx.c to spi_8xxx.c The driver handles MPC83xx, MPC85xx and MPC86xx SPI controllers, so rename the file for clarity. Suggested-by: Kumar Gala Signed-off-by: Anton Vorontsov Cc: Kumar Gala Cc: David Brownell Cc: Benjamin Herrenschmidt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index ecfadb180482..0f747c400c81 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -25,7 +25,7 @@ obj-$(CONFIG_SPI_OMAP24XX) += omap2_mcspi.o obj-$(CONFIG_SPI_ORION) += orion_spi.o obj-$(CONFIG_SPI_PL022) += amba-pl022.o obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o -obj-$(CONFIG_SPI_MPC83xx) += spi_mpc83xx.o +obj-$(CONFIG_SPI_MPC83xx) += spi_mpc8xxx.o obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o obj-$(CONFIG_SPI_TXX9) += spi_txx9.o diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c deleted file mode 100644 index c5cb98f65454..000000000000 --- a/drivers/spi/spi_mpc83xx.c +++ /dev/null @@ -1,945 +0,0 @@ -/* - * MPC83xx SPI controller driver. - * - * Maintainer: Kumar Gala - * - * Copyright (C) 2006 Polycom, Inc. - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -/* SPI Controller registers */ -struct mpc83xx_spi_reg { - u8 res1[0x20]; - __be32 mode; - __be32 event; - __be32 mask; - __be32 command; - __be32 transmit; - __be32 receive; -}; - -/* SPI Controller mode register definitions */ -#define SPMODE_LOOP (1 << 30) -#define SPMODE_CI_INACTIVEHIGH (1 << 29) -#define SPMODE_CP_BEGIN_EDGECLK (1 << 28) -#define SPMODE_DIV16 (1 << 27) -#define SPMODE_REV (1 << 26) -#define SPMODE_MS (1 << 25) -#define SPMODE_ENABLE (1 << 24) -#define SPMODE_LEN(x) ((x) << 20) -#define SPMODE_PM(x) ((x) << 16) -#define SPMODE_OP (1 << 14) -#define SPMODE_CG(x) ((x) << 7) - -/* - * Default for SPI Mode: - * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk - */ -#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ - SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) - -/* SPIE register values */ -#define SPIE_NE 0x00000200 /* Not empty */ -#define SPIE_NF 0x00000100 /* Not full */ - -/* SPIM register values */ -#define SPIM_NE 0x00000200 /* Not empty */ -#define SPIM_NF 0x00000100 /* Not full */ - -/* SPI Controller driver's private data. */ -struct mpc83xx_spi { - struct mpc83xx_spi_reg __iomem *base; - - /* rx & tx bufs from the spi_transfer */ - const void *tx; - void *rx; - - /* functions to deal with different sized buffers */ - void (*get_rx) (u32 rx_data, struct mpc83xx_spi *); - u32(*get_tx) (struct mpc83xx_spi *); - - unsigned int count; - unsigned int irq; - - unsigned nsecs; /* (clock cycle time)/2 */ - - u32 spibrg; /* SPIBRG input clock */ - u32 rx_shift; /* RX data reg shift when in qe mode */ - u32 tx_shift; /* TX data reg shift when in qe mode */ - - bool qe_mode; - - struct workqueue_struct *workqueue; - struct work_struct work; - - struct list_head queue; - spinlock_t lock; - - struct completion done; -}; - -struct spi_mpc83xx_cs { - /* functions to deal with different sized buffers */ - void (*get_rx) (u32 rx_data, struct mpc83xx_spi *); - u32 (*get_tx) (struct mpc83xx_spi *); - u32 rx_shift; /* RX data reg shift when in qe mode */ - u32 tx_shift; /* TX data reg shift when in qe mode */ - u32 hw_mode; /* Holds HW mode register settings */ -}; - -static inline void mpc83xx_spi_write_reg(__be32 __iomem *reg, u32 val) -{ - out_be32(reg, val); -} - -static inline u32 mpc83xx_spi_read_reg(__be32 __iomem *reg) -{ - return in_be32(reg); -} - -#define MPC83XX_SPI_RX_BUF(type) \ -static \ -void mpc83xx_spi_rx_buf_##type(u32 data, struct mpc83xx_spi *mpc83xx_spi) \ -{ \ - type *rx = mpc83xx_spi->rx; \ - *rx++ = (type)(data >> mpc83xx_spi->rx_shift); \ - mpc83xx_spi->rx = rx; \ -} - -#define MPC83XX_SPI_TX_BUF(type) \ -static \ -u32 mpc83xx_spi_tx_buf_##type(struct mpc83xx_spi *mpc83xx_spi) \ -{ \ - u32 data; \ - const type *tx = mpc83xx_spi->tx; \ - if (!tx) \ - return 0; \ - data = *tx++ << mpc83xx_spi->tx_shift; \ - mpc83xx_spi->tx = tx; \ - return data; \ -} - -MPC83XX_SPI_RX_BUF(u8) -MPC83XX_SPI_RX_BUF(u16) -MPC83XX_SPI_RX_BUF(u32) -MPC83XX_SPI_TX_BUF(u8) -MPC83XX_SPI_TX_BUF(u16) -MPC83XX_SPI_TX_BUF(u32) - -static void mpc83xx_spi_chipselect(struct spi_device *spi, int value) -{ - struct mpc83xx_spi *mpc83xx_spi = spi_master_get_devdata(spi->master); - struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data; - bool pol = spi->mode & SPI_CS_HIGH; - struct spi_mpc83xx_cs *cs = spi->controller_state; - - if (value == BITBANG_CS_INACTIVE) { - if (pdata->cs_control) - pdata->cs_control(spi, !pol); - } - - if (value == BITBANG_CS_ACTIVE) { - u32 regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); - - mpc83xx_spi->rx_shift = cs->rx_shift; - mpc83xx_spi->tx_shift = cs->tx_shift; - mpc83xx_spi->get_rx = cs->get_rx; - mpc83xx_spi->get_tx = cs->get_tx; - - if (cs->hw_mode != regval) { - unsigned long flags; - __be32 __iomem *mode = &mpc83xx_spi->base->mode; - - regval = cs->hw_mode; - /* Turn off IRQs locally to minimize time that - * SPI is disabled - */ - local_irq_save(flags); - /* Turn off SPI unit prior changing mode */ - mpc83xx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); - mpc83xx_spi_write_reg(mode, regval); - local_irq_restore(flags); - } - if (pdata->cs_control) - pdata->cs_control(spi, pol); - } -} - -static -int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) -{ - struct mpc83xx_spi *mpc83xx_spi; - u32 regval; - u8 bits_per_word, pm; - u32 hz; - struct spi_mpc83xx_cs *cs = spi->controller_state; - - mpc83xx_spi = spi_master_get_devdata(spi->master); - - if (t) { - bits_per_word = t->bits_per_word; - hz = t->speed_hz; - } else { - bits_per_word = 0; - hz = 0; - } - - /* spi_transfer level calls that work per-word */ - if (!bits_per_word) - bits_per_word = spi->bits_per_word; - - /* Make sure its a bit width we support [4..16, 32] */ - if ((bits_per_word < 4) - || ((bits_per_word > 16) && (bits_per_word != 32))) - return -EINVAL; - - if (!hz) - hz = spi->max_speed_hz; - - cs->rx_shift = 0; - cs->tx_shift = 0; - if (bits_per_word <= 8) { - cs->get_rx = mpc83xx_spi_rx_buf_u8; - cs->get_tx = mpc83xx_spi_tx_buf_u8; - if (mpc83xx_spi->qe_mode) { - cs->rx_shift = 16; - cs->tx_shift = 24; - } - } else if (bits_per_word <= 16) { - cs->get_rx = mpc83xx_spi_rx_buf_u16; - cs->get_tx = mpc83xx_spi_tx_buf_u16; - if (mpc83xx_spi->qe_mode) { - cs->rx_shift = 16; - cs->tx_shift = 16; - } - } else if (bits_per_word <= 32) { - cs->get_rx = mpc83xx_spi_rx_buf_u32; - cs->get_tx = mpc83xx_spi_tx_buf_u32; - } else - return -EINVAL; - - if (mpc83xx_spi->qe_mode && spi->mode & SPI_LSB_FIRST) { - cs->tx_shift = 0; - if (bits_per_word <= 8) - cs->rx_shift = 8; - else - cs->rx_shift = 0; - } - - mpc83xx_spi->rx_shift = cs->rx_shift; - mpc83xx_spi->tx_shift = cs->tx_shift; - mpc83xx_spi->get_rx = cs->get_rx; - mpc83xx_spi->get_tx = cs->get_tx; - - if (bits_per_word == 32) - bits_per_word = 0; - else - bits_per_word = bits_per_word - 1; - - /* mask out bits we are going to set */ - cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 - | SPMODE_PM(0xF)); - - cs->hw_mode |= SPMODE_LEN(bits_per_word); - - if ((mpc83xx_spi->spibrg / hz) > 64) { - cs->hw_mode |= SPMODE_DIV16; - pm = mpc83xx_spi->spibrg / (hz * 64); - - WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " - "Will use %d Hz instead.\n", dev_name(&spi->dev), - hz, mpc83xx_spi->spibrg / 1024); - if (pm > 16) - pm = 16; - } else - pm = mpc83xx_spi->spibrg / (hz * 4); - if (pm) - pm--; - - cs->hw_mode |= SPMODE_PM(pm); - regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); - if (cs->hw_mode != regval) { - unsigned long flags; - __be32 __iomem *mode = &mpc83xx_spi->base->mode; - - regval = cs->hw_mode; - /* Turn off IRQs locally to minimize time - * that SPI is disabled - */ - local_irq_save(flags); - /* Turn off SPI unit prior changing mode */ - mpc83xx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); - mpc83xx_spi_write_reg(mode, regval); - local_irq_restore(flags); - } - return 0; -} - -static int mpc83xx_spi_bufs(struct spi_device *spi, struct spi_transfer *t) -{ - struct mpc83xx_spi *mpc83xx_spi; - u32 word, len, bits_per_word; - - mpc83xx_spi = spi_master_get_devdata(spi->master); - - mpc83xx_spi->tx = t->tx_buf; - mpc83xx_spi->rx = t->rx_buf; - bits_per_word = spi->bits_per_word; - if (t->bits_per_word) - bits_per_word = t->bits_per_word; - len = t->len; - if (bits_per_word > 8) { - /* invalid length? */ - if (len & 1) - return -EINVAL; - len /= 2; - } - if (bits_per_word > 16) { - /* invalid length? */ - if (len & 1) - return -EINVAL; - len /= 2; - } - mpc83xx_spi->count = len; - - INIT_COMPLETION(mpc83xx_spi->done); - - /* enable rx ints */ - mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, SPIM_NE); - - /* transmit word */ - word = mpc83xx_spi->get_tx(mpc83xx_spi); - mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit, word); - - wait_for_completion(&mpc83xx_spi->done); - - /* disable rx ints */ - mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0); - - return mpc83xx_spi->count; -} - -static void mpc83xx_spi_do_one_msg(struct spi_message *m) -{ - struct spi_device *spi = m->spi; - struct spi_transfer *t; - unsigned int cs_change; - const int nsecs = 50; - int status; - - cs_change = 1; - status = 0; - list_for_each_entry(t, &m->transfers, transfer_list) { - if (t->bits_per_word || t->speed_hz) { - /* Don't allow changes if CS is active */ - status = -EINVAL; - - if (cs_change) - status = mpc83xx_spi_setup_transfer(spi, t); - if (status < 0) - break; - } - - if (cs_change) { - mpc83xx_spi_chipselect(spi, BITBANG_CS_ACTIVE); - ndelay(nsecs); - } - cs_change = t->cs_change; - if (t->len) - status = mpc83xx_spi_bufs(spi, t); - if (status) { - status = -EMSGSIZE; - break; - } - m->actual_length += t->len; - - if (t->delay_usecs) - udelay(t->delay_usecs); - - if (cs_change) { - ndelay(nsecs); - mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE); - ndelay(nsecs); - } - } - - m->status = status; - m->complete(m->context); - - if (status || !cs_change) { - ndelay(nsecs); - mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE); - } - - mpc83xx_spi_setup_transfer(spi, NULL); -} - -static void mpc83xx_spi_work(struct work_struct *work) -{ - struct mpc83xx_spi *mpc83xx_spi = container_of(work, struct mpc83xx_spi, - work); - - spin_lock_irq(&mpc83xx_spi->lock); - while (!list_empty(&mpc83xx_spi->queue)) { - struct spi_message *m = container_of(mpc83xx_spi->queue.next, - struct spi_message, queue); - - list_del_init(&m->queue); - spin_unlock_irq(&mpc83xx_spi->lock); - - mpc83xx_spi_do_one_msg(m); - - spin_lock_irq(&mpc83xx_spi->lock); - } - spin_unlock_irq(&mpc83xx_spi->lock); -} - -static int mpc83xx_spi_setup(struct spi_device *spi) -{ - struct mpc83xx_spi *mpc83xx_spi; - int retval; - u32 hw_mode; - struct spi_mpc83xx_cs *cs = spi->controller_state; - - if (!spi->max_speed_hz) - return -EINVAL; - - if (!cs) { - cs = kzalloc(sizeof *cs, GFP_KERNEL); - if (!cs) - return -ENOMEM; - spi->controller_state = cs; - } - mpc83xx_spi = spi_master_get_devdata(spi->master); - - hw_mode = cs->hw_mode; /* Save orginal settings */ - cs->hw_mode = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); - /* mask out bits we are going to set */ - cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH - | SPMODE_REV | SPMODE_LOOP); - - if (spi->mode & SPI_CPHA) - cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; - if (spi->mode & SPI_CPOL) - cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; - if (!(spi->mode & SPI_LSB_FIRST)) - cs->hw_mode |= SPMODE_REV; - if (spi->mode & SPI_LOOP) - cs->hw_mode |= SPMODE_LOOP; - - retval = mpc83xx_spi_setup_transfer(spi, NULL); - if (retval < 0) { - cs->hw_mode = hw_mode; /* Restore settings */ - return retval; - } - return 0; -} - -static irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data) -{ - struct mpc83xx_spi *mpc83xx_spi = context_data; - u32 event; - irqreturn_t ret = IRQ_NONE; - - /* Get interrupt events(tx/rx) */ - event = mpc83xx_spi_read_reg(&mpc83xx_spi->base->event); - - /* We need handle RX first */ - if (event & SPIE_NE) { - u32 rx_data = mpc83xx_spi_read_reg(&mpc83xx_spi->base->receive); - - if (mpc83xx_spi->rx) - mpc83xx_spi->get_rx(rx_data, mpc83xx_spi); - - ret = IRQ_HANDLED; - } - - if ((event & SPIE_NF) == 0) - /* spin until TX is done */ - while (((event = - mpc83xx_spi_read_reg(&mpc83xx_spi->base->event)) & - SPIE_NF) == 0) - cpu_relax(); - - mpc83xx_spi->count -= 1; - if (mpc83xx_spi->count) { - u32 word = mpc83xx_spi->get_tx(mpc83xx_spi); - mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit, word); - } else { - complete(&mpc83xx_spi->done); - } - - /* Clear the events */ - mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, event); - - return ret; -} -static int mpc83xx_spi_transfer(struct spi_device *spi, - struct spi_message *m) -{ - struct mpc83xx_spi *mpc83xx_spi = spi_master_get_devdata(spi->master); - unsigned long flags; - - m->actual_length = 0; - m->status = -EINPROGRESS; - - spin_lock_irqsave(&mpc83xx_spi->lock, flags); - list_add_tail(&m->queue, &mpc83xx_spi->queue); - queue_work(mpc83xx_spi->workqueue, &mpc83xx_spi->work); - spin_unlock_irqrestore(&mpc83xx_spi->lock, flags); - - return 0; -} - - -static void mpc83xx_spi_cleanup(struct spi_device *spi) -{ - kfree(spi->controller_state); -} - -static struct spi_master * __devinit -mpc83xx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) -{ - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct spi_master *master; - struct mpc83xx_spi *mpc83xx_spi; - u32 regval; - int ret = 0; - - master = spi_alloc_master(dev, sizeof(struct mpc83xx_spi)); - if (master == NULL) { - ret = -ENOMEM; - goto err; - } - - dev_set_drvdata(dev, master); - - /* the spi->mode bits understood by this driver: */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH - | SPI_LSB_FIRST | SPI_LOOP; - - master->setup = mpc83xx_spi_setup; - master->transfer = mpc83xx_spi_transfer; - master->cleanup = mpc83xx_spi_cleanup; - - mpc83xx_spi = spi_master_get_devdata(master); - mpc83xx_spi->qe_mode = pdata->qe_mode; - mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8; - mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8; - mpc83xx_spi->spibrg = pdata->sysclk; - - mpc83xx_spi->rx_shift = 0; - mpc83xx_spi->tx_shift = 0; - if (mpc83xx_spi->qe_mode) { - mpc83xx_spi->rx_shift = 16; - mpc83xx_spi->tx_shift = 24; - } - - init_completion(&mpc83xx_spi->done); - - mpc83xx_spi->base = ioremap(mem->start, mem->end - mem->start + 1); - if (mpc83xx_spi->base == NULL) { - ret = -ENOMEM; - goto put_master; - } - - mpc83xx_spi->irq = irq; - - /* Register for SPI Interrupt */ - ret = request_irq(mpc83xx_spi->irq, mpc83xx_spi_irq, - 0, "mpc83xx_spi", mpc83xx_spi); - - if (ret != 0) - goto unmap_io; - - master->bus_num = pdata->bus_num; - master->num_chipselect = pdata->max_chipselect; - - /* SPI controller initializations */ - mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0); - mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0); - mpc83xx_spi_write_reg(&mpc83xx_spi->base->command, 0); - mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, 0xffffffff); - - /* Enable SPI interface */ - regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; - if (pdata->qe_mode) - regval |= SPMODE_OP; - - mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval); - spin_lock_init(&mpc83xx_spi->lock); - init_completion(&mpc83xx_spi->done); - INIT_WORK(&mpc83xx_spi->work, mpc83xx_spi_work); - INIT_LIST_HEAD(&mpc83xx_spi->queue); - - mpc83xx_spi->workqueue = create_singlethread_workqueue( - dev_name(master->dev.parent)); - if (mpc83xx_spi->workqueue == NULL) { - ret = -EBUSY; - goto free_irq; - } - - ret = spi_register_master(master); - if (ret < 0) - goto unreg_master; - - printk(KERN_INFO - "%s: MPC83xx SPI Controller driver at 0x%p (irq = %d)\n", - dev_name(dev), mpc83xx_spi->base, mpc83xx_spi->irq); - - return master; - -unreg_master: - destroy_workqueue(mpc83xx_spi->workqueue); -free_irq: - free_irq(mpc83xx_spi->irq, mpc83xx_spi); -unmap_io: - iounmap(mpc83xx_spi->base); -put_master: - spi_master_put(master); -err: - return ERR_PTR(ret); -} - -static int __devexit mpc83xx_spi_remove(struct device *dev) -{ - struct mpc83xx_spi *mpc83xx_spi; - struct spi_master *master; - - master = dev_get_drvdata(dev); - mpc83xx_spi = spi_master_get_devdata(master); - - flush_workqueue(mpc83xx_spi->workqueue); - destroy_workqueue(mpc83xx_spi->workqueue); - spi_unregister_master(master); - - free_irq(mpc83xx_spi->irq, mpc83xx_spi); - iounmap(mpc83xx_spi->base); - - return 0; -} - -struct mpc83xx_spi_probe_info { - struct fsl_spi_platform_data pdata; - int *gpios; - bool *alow_flags; -}; - -static struct mpc83xx_spi_probe_info * -to_of_pinfo(struct fsl_spi_platform_data *pdata) -{ - return container_of(pdata, struct mpc83xx_spi_probe_info, pdata); -} - -static void mpc83xx_spi_cs_control(struct spi_device *spi, bool on) -{ - struct device *dev = spi->dev.parent; - struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data); - u16 cs = spi->chip_select; - int gpio = pinfo->gpios[cs]; - bool alow = pinfo->alow_flags[cs]; - - gpio_set_value(gpio, on ^ alow); -} - -static int of_mpc83xx_spi_get_chipselects(struct device *dev) -{ - struct device_node *np = dev_archdata_get_node(&dev->archdata); - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata); - unsigned int ngpios; - int i = 0; - int ret; - - ngpios = of_gpio_count(np); - if (!ngpios) { - /* - * SPI w/o chip-select line. One SPI device is still permitted - * though. - */ - pdata->max_chipselect = 1; - return 0; - } - - pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); - if (!pinfo->gpios) - return -ENOMEM; - memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); - - pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags), - GFP_KERNEL); - if (!pinfo->alow_flags) { - ret = -ENOMEM; - goto err_alloc_flags; - } - - for (; i < ngpios; i++) { - int gpio; - enum of_gpio_flags flags; - - gpio = of_get_gpio_flags(np, i, &flags); - if (!gpio_is_valid(gpio)) { - dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); - goto err_loop; - } - - ret = gpio_request(gpio, dev_name(dev)); - if (ret) { - dev_err(dev, "can't request gpio #%d: %d\n", i, ret); - goto err_loop; - } - - pinfo->gpios[i] = gpio; - pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; - - ret = gpio_direction_output(pinfo->gpios[i], - pinfo->alow_flags[i]); - if (ret) { - dev_err(dev, "can't set output direction for gpio " - "#%d: %d\n", i, ret); - goto err_loop; - } - } - - pdata->max_chipselect = ngpios; - pdata->cs_control = mpc83xx_spi_cs_control; - - return 0; - -err_loop: - while (i >= 0) { - if (gpio_is_valid(pinfo->gpios[i])) - gpio_free(pinfo->gpios[i]); - i--; - } - - kfree(pinfo->alow_flags); - pinfo->alow_flags = NULL; -err_alloc_flags: - kfree(pinfo->gpios); - pinfo->gpios = NULL; - return ret; -} - -static int of_mpc83xx_spi_free_chipselects(struct device *dev) -{ - struct fsl_spi_platform_data *pdata = dev->platform_data; - struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata); - int i; - - if (!pinfo->gpios) - return 0; - - for (i = 0; i < pdata->max_chipselect; i++) { - if (gpio_is_valid(pinfo->gpios[i])) - gpio_free(pinfo->gpios[i]); - } - - kfree(pinfo->gpios); - kfree(pinfo->alow_flags); - return 0; -} - -static int __devinit of_mpc83xx_spi_probe(struct of_device *ofdev, - const struct of_device_id *ofid) -{ - struct device *dev = &ofdev->dev; - struct device_node *np = ofdev->node; - struct mpc83xx_spi_probe_info *pinfo; - struct fsl_spi_platform_data *pdata; - struct spi_master *master; - struct resource mem; - struct resource irq; - const void *prop; - int ret = -ENOMEM; - - pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); - if (!pinfo) - return -ENOMEM; - - pdata = &pinfo->pdata; - dev->platform_data = pdata; - - /* Allocate bus num dynamically. */ - pdata->bus_num = -1; - - /* SPI controller is either clocked from QE or SoC clock. */ - pdata->sysclk = get_brgfreq(); - if (pdata->sysclk == -1) { - pdata->sysclk = fsl_get_sys_freq(); - if (pdata->sysclk == -1) { - ret = -ENODEV; - goto err_clk; - } - } - - prop = of_get_property(np, "mode", NULL); - if (prop && !strcmp(prop, "cpu-qe")) - pdata->qe_mode = 1; - - ret = of_mpc83xx_spi_get_chipselects(dev); - if (ret) - goto err; - - ret = of_address_to_resource(np, 0, &mem); - if (ret) - goto err; - - ret = of_irq_to_resource(np, 0, &irq); - if (!ret) { - ret = -EINVAL; - goto err; - } - - master = mpc83xx_spi_probe(dev, &mem, irq.start); - if (IS_ERR(master)) { - ret = PTR_ERR(master); - goto err; - } - - of_register_spi_devices(master, np); - - return 0; - -err: - of_mpc83xx_spi_free_chipselects(dev); -err_clk: - kfree(pinfo); - return ret; -} - -static int __devexit of_mpc83xx_spi_remove(struct of_device *ofdev) -{ - int ret; - - ret = mpc83xx_spi_remove(&ofdev->dev); - if (ret) - return ret; - of_mpc83xx_spi_free_chipselects(&ofdev->dev); - return 0; -} - -static const struct of_device_id of_mpc83xx_spi_match[] = { - { .compatible = "fsl,spi" }, - {}, -}; -MODULE_DEVICE_TABLE(of, of_mpc83xx_spi_match); - -static struct of_platform_driver of_mpc83xx_spi_driver = { - .name = "mpc83xx_spi", - .match_table = of_mpc83xx_spi_match, - .probe = of_mpc83xx_spi_probe, - .remove = __devexit_p(of_mpc83xx_spi_remove), -}; - -#ifdef CONFIG_MPC832x_RDB -/* - * XXX XXX XXX - * This is "legacy" platform driver, was used by the MPC8323E-RDB boards - * only. The driver should go away soon, since newer MPC8323E-RDB's device - * tree can work with OpenFirmware driver. But for now we support old trees - * as well. - */ -static int __devinit plat_mpc83xx_spi_probe(struct platform_device *pdev) -{ - struct resource *mem; - unsigned int irq; - struct spi_master *master; - - if (!pdev->dev.platform_data) - return -EINVAL; - - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!mem) - return -EINVAL; - - irq = platform_get_irq(pdev, 0); - if (!irq) - return -EINVAL; - - master = mpc83xx_spi_probe(&pdev->dev, mem, irq); - if (IS_ERR(master)) - return PTR_ERR(master); - return 0; -} - -static int __devexit plat_mpc83xx_spi_remove(struct platform_device *pdev) -{ - return mpc83xx_spi_remove(&pdev->dev); -} - -MODULE_ALIAS("platform:mpc83xx_spi"); -static struct platform_driver mpc83xx_spi_driver = { - .probe = plat_mpc83xx_spi_probe, - .remove = __exit_p(plat_mpc83xx_spi_remove), - .driver = { - .name = "mpc83xx_spi", - .owner = THIS_MODULE, - }, -}; - -static bool legacy_driver_failed; - -static void __init legacy_driver_register(void) -{ - legacy_driver_failed = platform_driver_register(&mpc83xx_spi_driver); -} - -static void __exit legacy_driver_unregister(void) -{ - if (legacy_driver_failed) - return; - platform_driver_unregister(&mpc83xx_spi_driver); -} -#else -static void __init legacy_driver_register(void) {} -static void __exit legacy_driver_unregister(void) {} -#endif /* CONFIG_MPC832x_RDB */ - -static int __init mpc83xx_spi_init(void) -{ - legacy_driver_register(); - return of_register_platform_driver(&of_mpc83xx_spi_driver); -} - -static void __exit mpc83xx_spi_exit(void) -{ - of_unregister_platform_driver(&of_mpc83xx_spi_driver); - legacy_driver_unregister(); -} - -module_init(mpc83xx_spi_init); -module_exit(mpc83xx_spi_exit); - -MODULE_AUTHOR("Kumar Gala"); -MODULE_DESCRIPTION("Simple MPC83xx SPI Driver"); -MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi_mpc8xxx.c b/drivers/spi/spi_mpc8xxx.c new file mode 100644 index 000000000000..c5cb98f65454 --- /dev/null +++ b/drivers/spi/spi_mpc8xxx.c @@ -0,0 +1,945 @@ +/* + * MPC83xx SPI controller driver. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +/* SPI Controller registers */ +struct mpc83xx_spi_reg { + u8 res1[0x20]; + __be32 mode; + __be32 event; + __be32 mask; + __be32 command; + __be32 transmit; + __be32 receive; +}; + +/* SPI Controller mode register definitions */ +#define SPMODE_LOOP (1 << 30) +#define SPMODE_CI_INACTIVEHIGH (1 << 29) +#define SPMODE_CP_BEGIN_EDGECLK (1 << 28) +#define SPMODE_DIV16 (1 << 27) +#define SPMODE_REV (1 << 26) +#define SPMODE_MS (1 << 25) +#define SPMODE_ENABLE (1 << 24) +#define SPMODE_LEN(x) ((x) << 20) +#define SPMODE_PM(x) ((x) << 16) +#define SPMODE_OP (1 << 14) +#define SPMODE_CG(x) ((x) << 7) + +/* + * Default for SPI Mode: + * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk + */ +#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \ + SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf)) + +/* SPIE register values */ +#define SPIE_NE 0x00000200 /* Not empty */ +#define SPIE_NF 0x00000100 /* Not full */ + +/* SPIM register values */ +#define SPIM_NE 0x00000200 /* Not empty */ +#define SPIM_NF 0x00000100 /* Not full */ + +/* SPI Controller driver's private data. */ +struct mpc83xx_spi { + struct mpc83xx_spi_reg __iomem *base; + + /* rx & tx bufs from the spi_transfer */ + const void *tx; + void *rx; + + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc83xx_spi *); + u32(*get_tx) (struct mpc83xx_spi *); + + unsigned int count; + unsigned int irq; + + unsigned nsecs; /* (clock cycle time)/2 */ + + u32 spibrg; /* SPIBRG input clock */ + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + + bool qe_mode; + + struct workqueue_struct *workqueue; + struct work_struct work; + + struct list_head queue; + spinlock_t lock; + + struct completion done; +}; + +struct spi_mpc83xx_cs { + /* functions to deal with different sized buffers */ + void (*get_rx) (u32 rx_data, struct mpc83xx_spi *); + u32 (*get_tx) (struct mpc83xx_spi *); + u32 rx_shift; /* RX data reg shift when in qe mode */ + u32 tx_shift; /* TX data reg shift when in qe mode */ + u32 hw_mode; /* Holds HW mode register settings */ +}; + +static inline void mpc83xx_spi_write_reg(__be32 __iomem *reg, u32 val) +{ + out_be32(reg, val); +} + +static inline u32 mpc83xx_spi_read_reg(__be32 __iomem *reg) +{ + return in_be32(reg); +} + +#define MPC83XX_SPI_RX_BUF(type) \ +static \ +void mpc83xx_spi_rx_buf_##type(u32 data, struct mpc83xx_spi *mpc83xx_spi) \ +{ \ + type *rx = mpc83xx_spi->rx; \ + *rx++ = (type)(data >> mpc83xx_spi->rx_shift); \ + mpc83xx_spi->rx = rx; \ +} + +#define MPC83XX_SPI_TX_BUF(type) \ +static \ +u32 mpc83xx_spi_tx_buf_##type(struct mpc83xx_spi *mpc83xx_spi) \ +{ \ + u32 data; \ + const type *tx = mpc83xx_spi->tx; \ + if (!tx) \ + return 0; \ + data = *tx++ << mpc83xx_spi->tx_shift; \ + mpc83xx_spi->tx = tx; \ + return data; \ +} + +MPC83XX_SPI_RX_BUF(u8) +MPC83XX_SPI_RX_BUF(u16) +MPC83XX_SPI_RX_BUF(u32) +MPC83XX_SPI_TX_BUF(u8) +MPC83XX_SPI_TX_BUF(u16) +MPC83XX_SPI_TX_BUF(u32) + +static void mpc83xx_spi_chipselect(struct spi_device *spi, int value) +{ + struct mpc83xx_spi *mpc83xx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data; + bool pol = spi->mode & SPI_CS_HIGH; + struct spi_mpc83xx_cs *cs = spi->controller_state; + + if (value == BITBANG_CS_INACTIVE) { + if (pdata->cs_control) + pdata->cs_control(spi, !pol); + } + + if (value == BITBANG_CS_ACTIVE) { + u32 regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); + + mpc83xx_spi->rx_shift = cs->rx_shift; + mpc83xx_spi->tx_shift = cs->tx_shift; + mpc83xx_spi->get_rx = cs->get_rx; + mpc83xx_spi->get_tx = cs->get_tx; + + if (cs->hw_mode != regval) { + unsigned long flags; + __be32 __iomem *mode = &mpc83xx_spi->base->mode; + + regval = cs->hw_mode; + /* Turn off IRQs locally to minimize time that + * SPI is disabled + */ + local_irq_save(flags); + /* Turn off SPI unit prior changing mode */ + mpc83xx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); + mpc83xx_spi_write_reg(mode, regval); + local_irq_restore(flags); + } + if (pdata->cs_control) + pdata->cs_control(spi, pol); + } +} + +static +int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) +{ + struct mpc83xx_spi *mpc83xx_spi; + u32 regval; + u8 bits_per_word, pm; + u32 hz; + struct spi_mpc83xx_cs *cs = spi->controller_state; + + mpc83xx_spi = spi_master_get_devdata(spi->master); + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } else { + bits_per_word = 0; + hz = 0; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + /* Make sure its a bit width we support [4..16, 32] */ + if ((bits_per_word < 4) + || ((bits_per_word > 16) && (bits_per_word != 32))) + return -EINVAL; + + if (!hz) + hz = spi->max_speed_hz; + + cs->rx_shift = 0; + cs->tx_shift = 0; + if (bits_per_word <= 8) { + cs->get_rx = mpc83xx_spi_rx_buf_u8; + cs->get_tx = mpc83xx_spi_tx_buf_u8; + if (mpc83xx_spi->qe_mode) { + cs->rx_shift = 16; + cs->tx_shift = 24; + } + } else if (bits_per_word <= 16) { + cs->get_rx = mpc83xx_spi_rx_buf_u16; + cs->get_tx = mpc83xx_spi_tx_buf_u16; + if (mpc83xx_spi->qe_mode) { + cs->rx_shift = 16; + cs->tx_shift = 16; + } + } else if (bits_per_word <= 32) { + cs->get_rx = mpc83xx_spi_rx_buf_u32; + cs->get_tx = mpc83xx_spi_tx_buf_u32; + } else + return -EINVAL; + + if (mpc83xx_spi->qe_mode && spi->mode & SPI_LSB_FIRST) { + cs->tx_shift = 0; + if (bits_per_word <= 8) + cs->rx_shift = 8; + else + cs->rx_shift = 0; + } + + mpc83xx_spi->rx_shift = cs->rx_shift; + mpc83xx_spi->tx_shift = cs->tx_shift; + mpc83xx_spi->get_rx = cs->get_rx; + mpc83xx_spi->get_tx = cs->get_tx; + + if (bits_per_word == 32) + bits_per_word = 0; + else + bits_per_word = bits_per_word - 1; + + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16 + | SPMODE_PM(0xF)); + + cs->hw_mode |= SPMODE_LEN(bits_per_word); + + if ((mpc83xx_spi->spibrg / hz) > 64) { + cs->hw_mode |= SPMODE_DIV16; + pm = mpc83xx_spi->spibrg / (hz * 64); + + WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + "Will use %d Hz instead.\n", dev_name(&spi->dev), + hz, mpc83xx_spi->spibrg / 1024); + if (pm > 16) + pm = 16; + } else + pm = mpc83xx_spi->spibrg / (hz * 4); + if (pm) + pm--; + + cs->hw_mode |= SPMODE_PM(pm); + regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); + if (cs->hw_mode != regval) { + unsigned long flags; + __be32 __iomem *mode = &mpc83xx_spi->base->mode; + + regval = cs->hw_mode; + /* Turn off IRQs locally to minimize time + * that SPI is disabled + */ + local_irq_save(flags); + /* Turn off SPI unit prior changing mode */ + mpc83xx_spi_write_reg(mode, regval & ~SPMODE_ENABLE); + mpc83xx_spi_write_reg(mode, regval); + local_irq_restore(flags); + } + return 0; +} + +static int mpc83xx_spi_bufs(struct spi_device *spi, struct spi_transfer *t) +{ + struct mpc83xx_spi *mpc83xx_spi; + u32 word, len, bits_per_word; + + mpc83xx_spi = spi_master_get_devdata(spi->master); + + mpc83xx_spi->tx = t->tx_buf; + mpc83xx_spi->rx = t->rx_buf; + bits_per_word = spi->bits_per_word; + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + len = t->len; + if (bits_per_word > 8) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + if (bits_per_word > 16) { + /* invalid length? */ + if (len & 1) + return -EINVAL; + len /= 2; + } + mpc83xx_spi->count = len; + + INIT_COMPLETION(mpc83xx_spi->done); + + /* enable rx ints */ + mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, SPIM_NE); + + /* transmit word */ + word = mpc83xx_spi->get_tx(mpc83xx_spi); + mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit, word); + + wait_for_completion(&mpc83xx_spi->done); + + /* disable rx ints */ + mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0); + + return mpc83xx_spi->count; +} + +static void mpc83xx_spi_do_one_msg(struct spi_message *m) +{ + struct spi_device *spi = m->spi; + struct spi_transfer *t; + unsigned int cs_change; + const int nsecs = 50; + int status; + + cs_change = 1; + status = 0; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { + /* Don't allow changes if CS is active */ + status = -EINVAL; + + if (cs_change) + status = mpc83xx_spi_setup_transfer(spi, t); + if (status < 0) + break; + } + + if (cs_change) { + mpc83xx_spi_chipselect(spi, BITBANG_CS_ACTIVE); + ndelay(nsecs); + } + cs_change = t->cs_change; + if (t->len) + status = mpc83xx_spi_bufs(spi, t); + if (status) { + status = -EMSGSIZE; + break; + } + m->actual_length += t->len; + + if (t->delay_usecs) + udelay(t->delay_usecs); + + if (cs_change) { + ndelay(nsecs); + mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE); + ndelay(nsecs); + } + } + + m->status = status; + m->complete(m->context); + + if (status || !cs_change) { + ndelay(nsecs); + mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE); + } + + mpc83xx_spi_setup_transfer(spi, NULL); +} + +static void mpc83xx_spi_work(struct work_struct *work) +{ + struct mpc83xx_spi *mpc83xx_spi = container_of(work, struct mpc83xx_spi, + work); + + spin_lock_irq(&mpc83xx_spi->lock); + while (!list_empty(&mpc83xx_spi->queue)) { + struct spi_message *m = container_of(mpc83xx_spi->queue.next, + struct spi_message, queue); + + list_del_init(&m->queue); + spin_unlock_irq(&mpc83xx_spi->lock); + + mpc83xx_spi_do_one_msg(m); + + spin_lock_irq(&mpc83xx_spi->lock); + } + spin_unlock_irq(&mpc83xx_spi->lock); +} + +static int mpc83xx_spi_setup(struct spi_device *spi) +{ + struct mpc83xx_spi *mpc83xx_spi; + int retval; + u32 hw_mode; + struct spi_mpc83xx_cs *cs = spi->controller_state; + + if (!spi->max_speed_hz) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof *cs, GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi->controller_state = cs; + } + mpc83xx_spi = spi_master_get_devdata(spi->master); + + hw_mode = cs->hw_mode; /* Save orginal settings */ + cs->hw_mode = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode); + /* mask out bits we are going to set */ + cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH + | SPMODE_REV | SPMODE_LOOP); + + if (spi->mode & SPI_CPHA) + cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK; + if (spi->mode & SPI_CPOL) + cs->hw_mode |= SPMODE_CI_INACTIVEHIGH; + if (!(spi->mode & SPI_LSB_FIRST)) + cs->hw_mode |= SPMODE_REV; + if (spi->mode & SPI_LOOP) + cs->hw_mode |= SPMODE_LOOP; + + retval = mpc83xx_spi_setup_transfer(spi, NULL); + if (retval < 0) { + cs->hw_mode = hw_mode; /* Restore settings */ + return retval; + } + return 0; +} + +static irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data) +{ + struct mpc83xx_spi *mpc83xx_spi = context_data; + u32 event; + irqreturn_t ret = IRQ_NONE; + + /* Get interrupt events(tx/rx) */ + event = mpc83xx_spi_read_reg(&mpc83xx_spi->base->event); + + /* We need handle RX first */ + if (event & SPIE_NE) { + u32 rx_data = mpc83xx_spi_read_reg(&mpc83xx_spi->base->receive); + + if (mpc83xx_spi->rx) + mpc83xx_spi->get_rx(rx_data, mpc83xx_spi); + + ret = IRQ_HANDLED; + } + + if ((event & SPIE_NF) == 0) + /* spin until TX is done */ + while (((event = + mpc83xx_spi_read_reg(&mpc83xx_spi->base->event)) & + SPIE_NF) == 0) + cpu_relax(); + + mpc83xx_spi->count -= 1; + if (mpc83xx_spi->count) { + u32 word = mpc83xx_spi->get_tx(mpc83xx_spi); + mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit, word); + } else { + complete(&mpc83xx_spi->done); + } + + /* Clear the events */ + mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, event); + + return ret; +} +static int mpc83xx_spi_transfer(struct spi_device *spi, + struct spi_message *m) +{ + struct mpc83xx_spi *mpc83xx_spi = spi_master_get_devdata(spi->master); + unsigned long flags; + + m->actual_length = 0; + m->status = -EINPROGRESS; + + spin_lock_irqsave(&mpc83xx_spi->lock, flags); + list_add_tail(&m->queue, &mpc83xx_spi->queue); + queue_work(mpc83xx_spi->workqueue, &mpc83xx_spi->work); + spin_unlock_irqrestore(&mpc83xx_spi->lock, flags); + + return 0; +} + + +static void mpc83xx_spi_cleanup(struct spi_device *spi) +{ + kfree(spi->controller_state); +} + +static struct spi_master * __devinit +mpc83xx_spi_probe(struct device *dev, struct resource *mem, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct spi_master *master; + struct mpc83xx_spi *mpc83xx_spi; + u32 regval; + int ret = 0; + + master = spi_alloc_master(dev, sizeof(struct mpc83xx_spi)); + if (master == NULL) { + ret = -ENOMEM; + goto err; + } + + dev_set_drvdata(dev, master); + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH + | SPI_LSB_FIRST | SPI_LOOP; + + master->setup = mpc83xx_spi_setup; + master->transfer = mpc83xx_spi_transfer; + master->cleanup = mpc83xx_spi_cleanup; + + mpc83xx_spi = spi_master_get_devdata(master); + mpc83xx_spi->qe_mode = pdata->qe_mode; + mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8; + mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8; + mpc83xx_spi->spibrg = pdata->sysclk; + + mpc83xx_spi->rx_shift = 0; + mpc83xx_spi->tx_shift = 0; + if (mpc83xx_spi->qe_mode) { + mpc83xx_spi->rx_shift = 16; + mpc83xx_spi->tx_shift = 24; + } + + init_completion(&mpc83xx_spi->done); + + mpc83xx_spi->base = ioremap(mem->start, mem->end - mem->start + 1); + if (mpc83xx_spi->base == NULL) { + ret = -ENOMEM; + goto put_master; + } + + mpc83xx_spi->irq = irq; + + /* Register for SPI Interrupt */ + ret = request_irq(mpc83xx_spi->irq, mpc83xx_spi_irq, + 0, "mpc83xx_spi", mpc83xx_spi); + + if (ret != 0) + goto unmap_io; + + master->bus_num = pdata->bus_num; + master->num_chipselect = pdata->max_chipselect; + + /* SPI controller initializations */ + mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0); + mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0); + mpc83xx_spi_write_reg(&mpc83xx_spi->base->command, 0); + mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, 0xffffffff); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + if (pdata->qe_mode) + regval |= SPMODE_OP; + + mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval); + spin_lock_init(&mpc83xx_spi->lock); + init_completion(&mpc83xx_spi->done); + INIT_WORK(&mpc83xx_spi->work, mpc83xx_spi_work); + INIT_LIST_HEAD(&mpc83xx_spi->queue); + + mpc83xx_spi->workqueue = create_singlethread_workqueue( + dev_name(master->dev.parent)); + if (mpc83xx_spi->workqueue == NULL) { + ret = -EBUSY; + goto free_irq; + } + + ret = spi_register_master(master); + if (ret < 0) + goto unreg_master; + + printk(KERN_INFO + "%s: MPC83xx SPI Controller driver at 0x%p (irq = %d)\n", + dev_name(dev), mpc83xx_spi->base, mpc83xx_spi->irq); + + return master; + +unreg_master: + destroy_workqueue(mpc83xx_spi->workqueue); +free_irq: + free_irq(mpc83xx_spi->irq, mpc83xx_spi); +unmap_io: + iounmap(mpc83xx_spi->base); +put_master: + spi_master_put(master); +err: + return ERR_PTR(ret); +} + +static int __devexit mpc83xx_spi_remove(struct device *dev) +{ + struct mpc83xx_spi *mpc83xx_spi; + struct spi_master *master; + + master = dev_get_drvdata(dev); + mpc83xx_spi = spi_master_get_devdata(master); + + flush_workqueue(mpc83xx_spi->workqueue); + destroy_workqueue(mpc83xx_spi->workqueue); + spi_unregister_master(master); + + free_irq(mpc83xx_spi->irq, mpc83xx_spi); + iounmap(mpc83xx_spi->base); + + return 0; +} + +struct mpc83xx_spi_probe_info { + struct fsl_spi_platform_data pdata; + int *gpios; + bool *alow_flags; +}; + +static struct mpc83xx_spi_probe_info * +to_of_pinfo(struct fsl_spi_platform_data *pdata) +{ + return container_of(pdata, struct mpc83xx_spi_probe_info, pdata); +} + +static void mpc83xx_spi_cs_control(struct spi_device *spi, bool on) +{ + struct device *dev = spi->dev.parent; + struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data); + u16 cs = spi->chip_select; + int gpio = pinfo->gpios[cs]; + bool alow = pinfo->alow_flags[cs]; + + gpio_set_value(gpio, on ^ alow); +} + +static int of_mpc83xx_spi_get_chipselects(struct device *dev) +{ + struct device_node *np = dev_archdata_get_node(&dev->archdata); + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata); + unsigned int ngpios; + int i = 0; + int ret; + + ngpios = of_gpio_count(np); + if (!ngpios) { + /* + * SPI w/o chip-select line. One SPI device is still permitted + * though. + */ + pdata->max_chipselect = 1; + return 0; + } + + pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); + if (!pinfo->gpios) + return -ENOMEM; + memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios)); + + pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags), + GFP_KERNEL); + if (!pinfo->alow_flags) { + ret = -ENOMEM; + goto err_alloc_flags; + } + + for (; i < ngpios; i++) { + int gpio; + enum of_gpio_flags flags; + + gpio = of_get_gpio_flags(np, i, &flags); + if (!gpio_is_valid(gpio)) { + dev_err(dev, "invalid gpio #%d: %d\n", i, gpio); + goto err_loop; + } + + ret = gpio_request(gpio, dev_name(dev)); + if (ret) { + dev_err(dev, "can't request gpio #%d: %d\n", i, ret); + goto err_loop; + } + + pinfo->gpios[i] = gpio; + pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW; + + ret = gpio_direction_output(pinfo->gpios[i], + pinfo->alow_flags[i]); + if (ret) { + dev_err(dev, "can't set output direction for gpio " + "#%d: %d\n", i, ret); + goto err_loop; + } + } + + pdata->max_chipselect = ngpios; + pdata->cs_control = mpc83xx_spi_cs_control; + + return 0; + +err_loop: + while (i >= 0) { + if (gpio_is_valid(pinfo->gpios[i])) + gpio_free(pinfo->gpios[i]); + i--; + } + + kfree(pinfo->alow_flags); + pinfo->alow_flags = NULL; +err_alloc_flags: + kfree(pinfo->gpios); + pinfo->gpios = NULL; + return ret; +} + +static int of_mpc83xx_spi_free_chipselects(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev->platform_data; + struct mpc83xx_spi_probe_info *pinfo = to_of_pinfo(pdata); + int i; + + if (!pinfo->gpios) + return 0; + + for (i = 0; i < pdata->max_chipselect; i++) { + if (gpio_is_valid(pinfo->gpios[i])) + gpio_free(pinfo->gpios[i]); + } + + kfree(pinfo->gpios); + kfree(pinfo->alow_flags); + return 0; +} + +static int __devinit of_mpc83xx_spi_probe(struct of_device *ofdev, + const struct of_device_id *ofid) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->node; + struct mpc83xx_spi_probe_info *pinfo; + struct fsl_spi_platform_data *pdata; + struct spi_master *master; + struct resource mem; + struct resource irq; + const void *prop; + int ret = -ENOMEM; + + pinfo = kzalloc(sizeof(*pinfo), GFP_KERNEL); + if (!pinfo) + return -ENOMEM; + + pdata = &pinfo->pdata; + dev->platform_data = pdata; + + /* Allocate bus num dynamically. */ + pdata->bus_num = -1; + + /* SPI controller is either clocked from QE or SoC clock. */ + pdata->sysclk = get_brgfreq(); + if (pdata->sysclk == -1) { + pdata->sysclk = fsl_get_sys_freq(); + if (pdata->sysclk == -1) { + ret = -ENODEV; + goto err_clk; + } + } + + prop = of_get_property(np, "mode", NULL); + if (prop && !strcmp(prop, "cpu-qe")) + pdata->qe_mode = 1; + + ret = of_mpc83xx_spi_get_chipselects(dev); + if (ret) + goto err; + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + goto err; + + ret = of_irq_to_resource(np, 0, &irq); + if (!ret) { + ret = -EINVAL; + goto err; + } + + master = mpc83xx_spi_probe(dev, &mem, irq.start); + if (IS_ERR(master)) { + ret = PTR_ERR(master); + goto err; + } + + of_register_spi_devices(master, np); + + return 0; + +err: + of_mpc83xx_spi_free_chipselects(dev); +err_clk: + kfree(pinfo); + return ret; +} + +static int __devexit of_mpc83xx_spi_remove(struct of_device *ofdev) +{ + int ret; + + ret = mpc83xx_spi_remove(&ofdev->dev); + if (ret) + return ret; + of_mpc83xx_spi_free_chipselects(&ofdev->dev); + return 0; +} + +static const struct of_device_id of_mpc83xx_spi_match[] = { + { .compatible = "fsl,spi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, of_mpc83xx_spi_match); + +static struct of_platform_driver of_mpc83xx_spi_driver = { + .name = "mpc83xx_spi", + .match_table = of_mpc83xx_spi_match, + .probe = of_mpc83xx_spi_probe, + .remove = __devexit_p(of_mpc83xx_spi_remove), +}; + +#ifdef CONFIG_MPC832x_RDB +/* + * XXX XXX XXX + * This is "legacy" platform driver, was used by the MPC8323E-RDB boards + * only. The driver should go away soon, since newer MPC8323E-RDB's device + * tree can work with OpenFirmware driver. But for now we support old trees + * as well. + */ +static int __devinit plat_mpc83xx_spi_probe(struct platform_device *pdev) +{ + struct resource *mem; + unsigned int irq; + struct spi_master *master; + + if (!pdev->dev.platform_data) + return -EINVAL; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (!irq) + return -EINVAL; + + master = mpc83xx_spi_probe(&pdev->dev, mem, irq); + if (IS_ERR(master)) + return PTR_ERR(master); + return 0; +} + +static int __devexit plat_mpc83xx_spi_remove(struct platform_device *pdev) +{ + return mpc83xx_spi_remove(&pdev->dev); +} + +MODULE_ALIAS("platform:mpc83xx_spi"); +static struct platform_driver mpc83xx_spi_driver = { + .probe = plat_mpc83xx_spi_probe, + .remove = __exit_p(plat_mpc83xx_spi_remove), + .driver = { + .name = "mpc83xx_spi", + .owner = THIS_MODULE, + }, +}; + +static bool legacy_driver_failed; + +static void __init legacy_driver_register(void) +{ + legacy_driver_failed = platform_driver_register(&mpc83xx_spi_driver); +} + +static void __exit legacy_driver_unregister(void) +{ + if (legacy_driver_failed) + return; + platform_driver_unregister(&mpc83xx_spi_driver); +} +#else +static void __init legacy_driver_register(void) {} +static void __exit legacy_driver_unregister(void) {} +#endif /* CONFIG_MPC832x_RDB */ + +static int __init mpc83xx_spi_init(void) +{ + legacy_driver_register(); + return of_register_platform_driver(&of_mpc83xx_spi_driver); +} + +static void __exit mpc83xx_spi_exit(void) +{ + of_unregister_platform_driver(&of_mpc83xx_spi_driver); + legacy_driver_unregister(); +} + +module_init(mpc83xx_spi_init); +module_exit(mpc83xx_spi_exit); + +MODULE_AUTHOR("Kumar Gala"); +MODULE_DESCRIPTION("Simple MPC83xx SPI Driver"); +MODULE_LICENSE("GPL");