diff options
Diffstat (limited to 'drivers/spi/spi-fsl-spi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-spi.c | 965 |
1 files changed, 965 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c new file mode 100644 index 000000000..60c590790 --- /dev/null +++ b/drivers/spi/spi-fsl-spi.c @@ -0,0 +1,965 @@ +/* + * Freescale SPI controller driver. + * + * Maintainer: Kumar Gala + * + * Copyright (C) 2006 Polycom, Inc. + * Copyright 2010 Freescale Semiconductor, Inc. + * + * CPM SPI and QE buffer descriptors mode support: + * Copyright (c) 2009 MontaVista Software, Inc. + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + * + * GRLIB support: + * Copyright (c) 2012 Aeroflex Gaisler AB. + * Author: Andreas Larsson <andreas@gaisler.com> + * + * 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/delay.h> +#include <linux/dma-mapping.h> +#include <linux/fsl_devices.h> +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_gpio.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/spi/spi.h> +#include <linux/spi/spi_bitbang.h> +#include <linux/types.h> + +#include "spi-fsl-lib.h" +#include "spi-fsl-cpm.h" +#include "spi-fsl-spi.h" + +#define TYPE_FSL 0 +#define TYPE_GRLIB 1 + +struct fsl_spi_match_data { + int type; +}; + +static struct fsl_spi_match_data of_fsl_spi_fsl_config = { + .type = TYPE_FSL, +}; + +static struct fsl_spi_match_data of_fsl_spi_grlib_config = { + .type = TYPE_GRLIB, +}; + +static const struct of_device_id of_fsl_spi_match[] = { + { + .compatible = "fsl,spi", + .data = &of_fsl_spi_fsl_config, + }, + { + .compatible = "aeroflexgaisler,spictrl", + .data = &of_fsl_spi_grlib_config, + }, + {} +}; +MODULE_DEVICE_TABLE(of, of_fsl_spi_match); + +static int fsl_spi_get_type(struct device *dev) +{ + const struct of_device_id *match; + + if (dev->of_node) { + match = of_match_node(of_fsl_spi_match, dev->of_node); + if (match && match->data) + return ((struct fsl_spi_match_data *)match->data)->type; + } + return TYPE_FSL; +} + +static void fsl_spi_change_mode(struct spi_device *spi) +{ + struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi->controller_state; + struct fsl_spi_reg *reg_base = mspi->reg_base; + __be32 __iomem *mode = ®_base->mode; + unsigned long flags; + + if (cs->hw_mode == mpc8xxx_spi_read_reg(mode)) + return; + + /* Turn off IRQs locally to minimize time that SPI is disabled. */ + local_irq_save(flags); + + /* Turn off SPI unit prior changing mode */ + mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE); + + /* When in CPM mode, we need to reinit tx and rx. */ + if (mspi->flags & SPI_CPM_MODE) { + fsl_spi_cpm_reinit_txrx(mspi); + } + mpc8xxx_spi_write_reg(mode, cs->hw_mode); + local_irq_restore(flags); +} + +static void fsl_spi_chipselect(struct spi_device *spi, int value) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_platform_data *pdata; + bool pol = spi->mode & SPI_CS_HIGH; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + pdata = spi->dev.parent->parent->platform_data; + + if (value == BITBANG_CS_INACTIVE) { + if (pdata->cs_control) + pdata->cs_control(spi, !pol); + } + + if (value == BITBANG_CS_ACTIVE) { + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + fsl_spi_change_mode(spi); + + if (pdata->cs_control) + pdata->cs_control(spi, pol); + } +} + +static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first) +{ + *rx_shift = 0; + *tx_shift = 0; + if (msb_first) { + if (bits_per_word <= 8) { + *rx_shift = 16; + *tx_shift = 24; + } else if (bits_per_word <= 16) { + *rx_shift = 16; + *tx_shift = 16; + } + } else { + if (bits_per_word <= 8) + *rx_shift = 8; + } +} + +static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift, + int bits_per_word, int msb_first) +{ + *rx_shift = 0; + *tx_shift = 0; + if (bits_per_word <= 16) { + if (msb_first) { + *rx_shift = 16; /* LSB in bit 16 */ + *tx_shift = 32 - bits_per_word; /* MSB in bit 31 */ + } else { + *rx_shift = 16 - bits_per_word; /* MSB in bit 15 */ + } + } +} + +static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs, + struct spi_device *spi, + struct mpc8xxx_spi *mpc8xxx_spi, + int bits_per_word) +{ + cs->rx_shift = 0; + cs->tx_shift = 0; + if (bits_per_word <= 8) { + cs->get_rx = mpc8xxx_spi_rx_buf_u8; + cs->get_tx = mpc8xxx_spi_tx_buf_u8; + } else if (bits_per_word <= 16) { + cs->get_rx = mpc8xxx_spi_rx_buf_u16; + cs->get_tx = mpc8xxx_spi_tx_buf_u16; + } else if (bits_per_word <= 32) { + cs->get_rx = mpc8xxx_spi_rx_buf_u32; + cs->get_tx = mpc8xxx_spi_tx_buf_u32; + } else + return -EINVAL; + + if (mpc8xxx_spi->set_shifts) + mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift, + bits_per_word, + !(spi->mode & SPI_LSB_FIRST)); + + mpc8xxx_spi->rx_shift = cs->rx_shift; + mpc8xxx_spi->tx_shift = cs->tx_shift; + mpc8xxx_spi->get_rx = cs->get_rx; + mpc8xxx_spi->get_tx = cs->get_tx; + + return bits_per_word; +} + +static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs, + struct spi_device *spi, + int bits_per_word) +{ + /* QE uses Little Endian for words > 8 + * so transform all words > 8 into 8 bits + * Unfortnatly that doesn't work for LSB so + * reject these for now */ + /* Note: 32 bits word, LSB works iff + * tfcr/rfcr is set to CPMFCR_GBL */ + if (spi->mode & SPI_LSB_FIRST && + bits_per_word > 8) + return -EINVAL; + if (bits_per_word > 8) + return 8; /* pretend its 8 bits */ + return bits_per_word; +} + +static int fsl_spi_setup_transfer(struct spi_device *spi, + struct spi_transfer *t) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + int bits_per_word = 0; + u8 pm; + u32 hz = 0; + struct spi_mpc8xxx_cs *cs = spi->controller_state; + + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + if (t) { + bits_per_word = t->bits_per_word; + hz = t->speed_hz; + } + + /* spi_transfer level calls that work per-word */ + if (!bits_per_word) + bits_per_word = spi->bits_per_word; + + if (!hz) + hz = spi->max_speed_hz; + + if (!(mpc8xxx_spi->flags & SPI_CPM_MODE)) + bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi, + mpc8xxx_spi, + bits_per_word); + else if (mpc8xxx_spi->flags & SPI_QE) + bits_per_word = mspi_apply_qe_mode_quirks(cs, spi, + bits_per_word); + + if (bits_per_word < 0) + return bits_per_word; + + 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 ((mpc8xxx_spi->spibrg / hz) > 64) { + cs->hw_mode |= SPMODE_DIV16; + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1; + + WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. " + "Will use %d Hz instead.\n", dev_name(&spi->dev), + hz, mpc8xxx_spi->spibrg / 1024); + if (pm > 16) + pm = 16; + } else { + pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; + } + if (pm) + pm--; + + cs->hw_mode |= SPMODE_PM(pm); + + fsl_spi_change_mode(spi); + return 0; +} + +static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi, + struct spi_transfer *t, unsigned int len) +{ + u32 word; + struct fsl_spi_reg *reg_base = mspi->reg_base; + + mspi->count = len; + + /* enable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE); + + /* transmit word */ + word = mspi->get_tx(mspi); + mpc8xxx_spi_write_reg(®_base->transmit, word); + + return 0; +} + +static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t, + bool is_dma_mapped) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_reg *reg_base; + unsigned int len = t->len; + u8 bits_per_word; + int ret; + + reg_base = mpc8xxx_spi->reg_base; + bits_per_word = spi->bits_per_word; + if (t->bits_per_word) + bits_per_word = t->bits_per_word; + + 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; + } + + mpc8xxx_spi->tx = t->tx_buf; + mpc8xxx_spi->rx = t->rx_buf; + + reinit_completion(&mpc8xxx_spi->done); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped); + else + ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len); + if (ret) + return ret; + + wait_for_completion(&mpc8xxx_spi->done); + + /* disable rx ints */ + mpc8xxx_spi_write_reg(®_base->mask, 0); + + if (mpc8xxx_spi->flags & SPI_CPM_MODE) + fsl_spi_cpm_bufs_complete(mpc8xxx_spi); + + return mpc8xxx_spi->count; +} + +static int fsl_spi_do_one_msg(struct spi_master *master, + struct spi_message *m) +{ + struct spi_device *spi = m->spi; + struct spi_transfer *t, *first; + unsigned int cs_change; + const int nsecs = 50; + int status; + + /* Don't allow changes if CS is active */ + first = list_first_entry(&m->transfers, struct spi_transfer, + transfer_list); + list_for_each_entry(t, &m->transfers, transfer_list) { + if ((first->bits_per_word != t->bits_per_word) || + (first->speed_hz != t->speed_hz)) { + dev_err(&spi->dev, + "bits_per_word/speed_hz should be same for the same SPI transfer\n"); + return -EINVAL; + } + } + + cs_change = 1; + status = -EINVAL; + list_for_each_entry(t, &m->transfers, transfer_list) { + if (t->bits_per_word || t->speed_hz) { + if (cs_change) + status = fsl_spi_setup_transfer(spi, t); + if (status < 0) + break; + } + + if (cs_change) { + fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE); + ndelay(nsecs); + } + cs_change = t->cs_change; + if (t->len) + status = fsl_spi_bufs(spi, t, m->is_dma_mapped); + if (status) { + status = -EMSGSIZE; + break; + } + m->actual_length += t->len; + + if (t->delay_usecs) + udelay(t->delay_usecs); + + if (cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + ndelay(nsecs); + } + } + + m->status = status; + spi_finalize_current_message(master); + + if (status || !cs_change) { + ndelay(nsecs); + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + } + + fsl_spi_setup_transfer(spi, NULL); + return 0; +} + +static int fsl_spi_setup(struct spi_device *spi) +{ + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_spi_reg *reg_base; + int retval; + u32 hw_mode; + struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); + + if (!spi->max_speed_hz) + return -EINVAL; + + if (!cs) { + cs = kzalloc(sizeof(*cs), GFP_KERNEL); + if (!cs) + return -ENOMEM; + spi_set_ctldata(spi, cs); + } + mpc8xxx_spi = spi_master_get_devdata(spi->master); + + reg_base = mpc8xxx_spi->reg_base; + + hw_mode = cs->hw_mode; /* Save original settings */ + cs->hw_mode = mpc8xxx_spi_read_reg(®_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 = fsl_spi_setup_transfer(spi, NULL); + if (retval < 0) { + cs->hw_mode = hw_mode; /* Restore settings */ + return retval; + } + + if (mpc8xxx_spi->type == TYPE_GRLIB) { + if (gpio_is_valid(spi->cs_gpio)) { + int desel; + + retval = gpio_request(spi->cs_gpio, + dev_name(&spi->dev)); + if (retval) + return retval; + + desel = !(spi->mode & SPI_CS_HIGH); + retval = gpio_direction_output(spi->cs_gpio, desel); + if (retval) { + gpio_free(spi->cs_gpio); + return retval; + } + } else if (spi->cs_gpio != -ENOENT) { + if (spi->cs_gpio < 0) + return spi->cs_gpio; + return -EINVAL; + } + /* When spi->cs_gpio == -ENOENT, a hole in the phandle list + * indicates to use native chipselect if present, or allow for + * an always selected chip + */ + } + + /* Initialize chipselect - might be active for SPI_CS_HIGH mode */ + fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE); + + return 0; +} + +static void fsl_spi_cleanup(struct spi_device *spi) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi); + + if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio)) + gpio_free(spi->cs_gpio); + + kfree(cs); + spi_set_ctldata(spi, NULL); +} + +static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) +{ + struct fsl_spi_reg *reg_base = mspi->reg_base; + + /* We need handle RX first */ + if (events & SPIE_NE) { + u32 rx_data = mpc8xxx_spi_read_reg(®_base->receive); + + if (mspi->rx) + mspi->get_rx(rx_data, mspi); + } + + if ((events & SPIE_NF) == 0) + /* spin until TX is done */ + while (((events = + mpc8xxx_spi_read_reg(®_base->event)) & + SPIE_NF) == 0) + cpu_relax(); + + /* Clear the events */ + mpc8xxx_spi_write_reg(®_base->event, events); + + mspi->count -= 1; + if (mspi->count) { + u32 word = mspi->get_tx(mspi); + + mpc8xxx_spi_write_reg(®_base->transmit, word); + } else { + complete(&mspi->done); + } +} + +static irqreturn_t fsl_spi_irq(s32 irq, void *context_data) +{ + struct mpc8xxx_spi *mspi = context_data; + irqreturn_t ret = IRQ_NONE; + u32 events; + struct fsl_spi_reg *reg_base = mspi->reg_base; + + /* Get interrupt events(tx/rx) */ + events = mpc8xxx_spi_read_reg(®_base->event); + if (events) + ret = IRQ_HANDLED; + + dev_dbg(mspi->dev, "%s: events %x\n", __func__, events); + + if (mspi->flags & SPI_CPM_MODE) + fsl_spi_cpm_irq(mspi, events); + else + fsl_spi_cpu_irq(mspi, events); + + return ret; +} + +static void fsl_spi_remove(struct mpc8xxx_spi *mspi) +{ + iounmap(mspi->reg_base); + fsl_spi_cpm_free(mspi); +} + +static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on) +{ + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master); + struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; + u32 slvsel; + u16 cs = spi->chip_select; + + if (gpio_is_valid(spi->cs_gpio)) { + gpio_set_value(spi->cs_gpio, on); + } else if (cs < mpc8xxx_spi->native_chipselects) { + slvsel = mpc8xxx_spi_read_reg(®_base->slvsel); + slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs)); + mpc8xxx_spi_write_reg(®_base->slvsel, slvsel); + } +} + +static void fsl_spi_grlib_probe(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master = dev_get_drvdata(dev); + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base; + int mbits; + u32 capabilities; + + capabilities = mpc8xxx_spi_read_reg(®_base->cap); + + mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts; + mbits = SPCAP_MAXWLEN(capabilities); + if (mbits) + mpc8xxx_spi->max_bits_per_word = mbits + 1; + + mpc8xxx_spi->native_chipselects = 0; + if (SPCAP_SSEN(capabilities)) { + mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities); + mpc8xxx_spi_write_reg(®_base->slvsel, 0xffffffff); + } + master->num_chipselect = mpc8xxx_spi->native_chipselects; + pdata->cs_control = fsl_spi_grlib_cs_control; +} + +static struct spi_master * fsl_spi_probe(struct device *dev, + struct resource *mem, unsigned int irq) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct spi_master *master; + struct mpc8xxx_spi *mpc8xxx_spi; + struct fsl_spi_reg *reg_base; + u32 regval; + int ret = 0; + + master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi)); + if (master == NULL) { + ret = -ENOMEM; + goto err; + } + + dev_set_drvdata(dev, master); + + mpc8xxx_spi_probe(dev, mem, irq); + + master->setup = fsl_spi_setup; + master->cleanup = fsl_spi_cleanup; + master->transfer_one_message = fsl_spi_do_one_msg; + + mpc8xxx_spi = spi_master_get_devdata(master); + mpc8xxx_spi->spi_remove = fsl_spi_remove; + mpc8xxx_spi->max_bits_per_word = 32; + mpc8xxx_spi->type = fsl_spi_get_type(dev); + + ret = fsl_spi_cpm_init(mpc8xxx_spi); + if (ret) + goto err_cpm_init; + + mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem)); + if (mpc8xxx_spi->reg_base == NULL) { + ret = -ENOMEM; + goto err_ioremap; + } + + if (mpc8xxx_spi->type == TYPE_GRLIB) + fsl_spi_grlib_probe(dev); + + master->bits_per_word_mask = + (SPI_BPW_RANGE_MASK(4, 16) | SPI_BPW_MASK(32)) & + SPI_BPW_RANGE_MASK(1, mpc8xxx_spi->max_bits_per_word); + + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts; + + if (mpc8xxx_spi->set_shifts) + /* 8 bits per word and MSB first */ + mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift, + &mpc8xxx_spi->tx_shift, 8, 1); + + /* Register for SPI Interrupt */ + ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq, + 0, "fsl_spi", mpc8xxx_spi); + + if (ret != 0) + goto free_irq; + + reg_base = mpc8xxx_spi->reg_base; + + /* SPI controller initializations */ + mpc8xxx_spi_write_reg(®_base->mode, 0); + mpc8xxx_spi_write_reg(®_base->mask, 0); + mpc8xxx_spi_write_reg(®_base->command, 0); + mpc8xxx_spi_write_reg(®_base->event, 0xffffffff); + + /* Enable SPI interface */ + regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE; + if (mpc8xxx_spi->max_bits_per_word < 8) { + regval &= ~SPMODE_LEN(0xF); + regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1); + } + if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) + regval |= SPMODE_OP; + + mpc8xxx_spi_write_reg(®_base->mode, regval); + + ret = spi_register_master(master); + if (ret < 0) + goto unreg_master; + + dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base, + mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags)); + + return master; + +unreg_master: + free_irq(mpc8xxx_spi->irq, mpc8xxx_spi); +free_irq: + iounmap(mpc8xxx_spi->reg_base); +err_ioremap: + fsl_spi_cpm_free(mpc8xxx_spi); +err_cpm_init: + spi_master_put(master); +err: + return ERR_PTR(ret); +} + +static void fsl_spi_cs_control(struct spi_device *spi, bool on) +{ + struct device *dev = spi->dev.parent->parent; + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); + 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_fsl_spi_get_chipselects(struct device *dev) +{ + struct device_node *np = dev->of_node; + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata); + int ngpios; + int i = 0; + int ret; + + ngpios = of_gpio_count(np); + if (ngpios <= 0) { + /* + * 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); + ret = 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 = fsl_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_fsl_spi_free_chipselects(struct device *dev) +{ + struct fsl_spi_platform_data *pdata = dev_get_platdata(dev); + struct mpc8xxx_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 of_fsl_spi_probe(struct platform_device *ofdev) +{ + struct device *dev = &ofdev->dev; + struct device_node *np = ofdev->dev.of_node; + struct spi_master *master; + struct resource mem; + int irq, type; + int ret = -ENOMEM; + + ret = of_mpc8xxx_spi_probe(ofdev); + if (ret) + return ret; + + type = fsl_spi_get_type(&ofdev->dev); + if (type == TYPE_FSL) { + ret = of_fsl_spi_get_chipselects(dev); + if (ret) + goto err; + } + + ret = of_address_to_resource(np, 0, &mem); + if (ret) + goto err; + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + ret = -EINVAL; + goto err; + } + + master = fsl_spi_probe(dev, &mem, irq); + if (IS_ERR(master)) { + ret = PTR_ERR(master); + goto err; + } + + return 0; + +err: + if (type == TYPE_FSL) + of_fsl_spi_free_chipselects(dev); + return ret; +} + +static int of_fsl_spi_remove(struct platform_device *ofdev) +{ + struct spi_master *master = platform_get_drvdata(ofdev); + struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master); + int ret; + + ret = mpc8xxx_spi_remove(&ofdev->dev); + if (ret) + return ret; + if (mpc8xxx_spi->type == TYPE_FSL) + of_fsl_spi_free_chipselects(&ofdev->dev); + return 0; +} + +static struct platform_driver of_fsl_spi_driver = { + .driver = { + .name = "fsl_spi", + .of_match_table = of_fsl_spi_match, + }, + .probe = of_fsl_spi_probe, + .remove = of_fsl_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 plat_mpc8xxx_spi_probe(struct platform_device *pdev) +{ + struct resource *mem; + int irq; + struct spi_master *master; + + if (!dev_get_platdata(&pdev->dev)) + return -EINVAL; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) + return -EINVAL; + + master = fsl_spi_probe(&pdev->dev, mem, irq); + return PTR_ERR_OR_ZERO(master); +} + +static int plat_mpc8xxx_spi_remove(struct platform_device *pdev) +{ + return mpc8xxx_spi_remove(&pdev->dev); +} + +MODULE_ALIAS("platform:mpc8xxx_spi"); +static struct platform_driver mpc8xxx_spi_driver = { + .probe = plat_mpc8xxx_spi_probe, + .remove = plat_mpc8xxx_spi_remove, + .driver = { + .name = "mpc8xxx_spi", + }, +}; + +static bool legacy_driver_failed; + +static void __init legacy_driver_register(void) +{ + legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver); +} + +static void __exit legacy_driver_unregister(void) +{ + if (legacy_driver_failed) + return; + platform_driver_unregister(&mpc8xxx_spi_driver); +} +#else +static void __init legacy_driver_register(void) {} +static void __exit legacy_driver_unregister(void) {} +#endif /* CONFIG_MPC832x_RDB */ + +static int __init fsl_spi_init(void) +{ + legacy_driver_register(); + return platform_driver_register(&of_fsl_spi_driver); +} +module_init(fsl_spi_init); + +static void __exit fsl_spi_exit(void) +{ + platform_driver_unregister(&of_fsl_spi_driver); + legacy_driver_unregister(); +} +module_exit(fsl_spi_exit); + +MODULE_AUTHOR("Kumar Gala"); +MODULE_DESCRIPTION("Simple Freescale SPI Driver"); +MODULE_LICENSE("GPL"); |