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![Grant Likely](/assets/img/avatar_default.png)
Get rid of users of of_platform_driver in drivers/spi. The of_platform_{,un}register_driver functions are going away, so the users need to be converted to using the platform_bus_type directly. Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
1192 lines
28 KiB
C
1192 lines
28 KiB
C
/*
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* Freescale SPI controller driver.
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*
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* Maintainer: Kumar Gala
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*
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* Copyright (C) 2006 Polycom, Inc.
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* Copyright 2010 Freescale Semiconductor, Inc.
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*
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* CPM SPI and QE buffer descriptors mode support:
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* Copyright (c) 2009 MontaVista Software, Inc.
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/irq.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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#include <linux/platform_device.h>
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#include <linux/fsl_devices.h>
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#include <linux/dma-mapping.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <sysdev/fsl_soc.h>
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#include <asm/cpm.h>
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#include <asm/qe.h>
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#include "spi_fsl_lib.h"
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/* CPM1 and CPM2 are mutually exclusive. */
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#ifdef CONFIG_CPM1
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#include <asm/cpm1.h>
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#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
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#else
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#include <asm/cpm2.h>
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#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
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#endif
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/* SPI Controller registers */
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struct fsl_spi_reg {
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u8 res1[0x20];
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__be32 mode;
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__be32 event;
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__be32 mask;
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__be32 command;
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__be32 transmit;
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__be32 receive;
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};
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/* SPI Controller mode register definitions */
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#define SPMODE_LOOP (1 << 30)
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#define SPMODE_CI_INACTIVEHIGH (1 << 29)
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#define SPMODE_CP_BEGIN_EDGECLK (1 << 28)
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#define SPMODE_DIV16 (1 << 27)
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#define SPMODE_REV (1 << 26)
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#define SPMODE_MS (1 << 25)
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#define SPMODE_ENABLE (1 << 24)
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#define SPMODE_LEN(x) ((x) << 20)
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#define SPMODE_PM(x) ((x) << 16)
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#define SPMODE_OP (1 << 14)
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#define SPMODE_CG(x) ((x) << 7)
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/*
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* Default for SPI Mode:
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* SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk
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*/
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#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \
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SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf))
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/* SPIE register values */
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#define SPIE_NE 0x00000200 /* Not empty */
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#define SPIE_NF 0x00000100 /* Not full */
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/* SPIM register values */
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#define SPIM_NE 0x00000200 /* Not empty */
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#define SPIM_NF 0x00000100 /* Not full */
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#define SPIE_TXB 0x00000200 /* Last char is written to tx fifo */
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#define SPIE_RXB 0x00000100 /* Last char is written to rx buf */
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/* SPCOM register values */
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#define SPCOM_STR (1 << 23) /* Start transmit */
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#define SPI_PRAM_SIZE 0x100
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#define SPI_MRBLR ((unsigned int)PAGE_SIZE)
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static void *fsl_dummy_rx;
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static DEFINE_MUTEX(fsl_dummy_rx_lock);
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static int fsl_dummy_rx_refcnt;
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static void fsl_spi_change_mode(struct spi_device *spi)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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struct fsl_spi_reg *reg_base = mspi->reg_base;
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__be32 __iomem *mode = ®_base->mode;
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unsigned long flags;
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if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
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return;
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/* Turn off IRQs locally to minimize time that SPI is disabled. */
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local_irq_save(flags);
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/* Turn off SPI unit prior changing mode */
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mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
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/* When in CPM mode, we need to reinit tx and rx. */
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if (mspi->flags & SPI_CPM_MODE) {
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if (mspi->flags & SPI_QE) {
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qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock,
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QE_CR_PROTOCOL_UNSPECIFIED, 0);
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} else {
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cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX);
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if (mspi->flags & SPI_CPM1) {
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out_be16(&mspi->pram->rbptr,
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in_be16(&mspi->pram->rbase));
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out_be16(&mspi->pram->tbptr,
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in_be16(&mspi->pram->tbase));
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}
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}
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}
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mpc8xxx_spi_write_reg(mode, cs->hw_mode);
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local_irq_restore(flags);
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}
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static void fsl_spi_chipselect(struct spi_device *spi, int value)
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{
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struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
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struct fsl_spi_platform_data *pdata = spi->dev.parent->platform_data;
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bool pol = spi->mode & SPI_CS_HIGH;
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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if (value == BITBANG_CS_INACTIVE) {
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if (pdata->cs_control)
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pdata->cs_control(spi, !pol);
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}
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if (value == BITBANG_CS_ACTIVE) {
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mpc8xxx_spi->rx_shift = cs->rx_shift;
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mpc8xxx_spi->tx_shift = cs->tx_shift;
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mpc8xxx_spi->get_rx = cs->get_rx;
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mpc8xxx_spi->get_tx = cs->get_tx;
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fsl_spi_change_mode(spi);
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if (pdata->cs_control)
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pdata->cs_control(spi, pol);
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}
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}
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static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
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struct spi_device *spi,
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struct mpc8xxx_spi *mpc8xxx_spi,
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int bits_per_word)
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{
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cs->rx_shift = 0;
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cs->tx_shift = 0;
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if (bits_per_word <= 8) {
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cs->get_rx = mpc8xxx_spi_rx_buf_u8;
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cs->get_tx = mpc8xxx_spi_tx_buf_u8;
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if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
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cs->rx_shift = 16;
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cs->tx_shift = 24;
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}
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} else if (bits_per_word <= 16) {
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cs->get_rx = mpc8xxx_spi_rx_buf_u16;
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cs->get_tx = mpc8xxx_spi_tx_buf_u16;
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if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
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cs->rx_shift = 16;
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cs->tx_shift = 16;
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}
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} else if (bits_per_word <= 32) {
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cs->get_rx = mpc8xxx_spi_rx_buf_u32;
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cs->get_tx = mpc8xxx_spi_tx_buf_u32;
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} else
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return -EINVAL;
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if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE &&
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spi->mode & SPI_LSB_FIRST) {
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cs->tx_shift = 0;
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if (bits_per_word <= 8)
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cs->rx_shift = 8;
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else
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cs->rx_shift = 0;
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}
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mpc8xxx_spi->rx_shift = cs->rx_shift;
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mpc8xxx_spi->tx_shift = cs->tx_shift;
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mpc8xxx_spi->get_rx = cs->get_rx;
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mpc8xxx_spi->get_tx = cs->get_tx;
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return bits_per_word;
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}
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static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
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struct spi_device *spi,
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int bits_per_word)
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{
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/* QE uses Little Endian for words > 8
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* so transform all words > 8 into 8 bits
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* Unfortnatly that doesn't work for LSB so
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* reject these for now */
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/* Note: 32 bits word, LSB works iff
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* tfcr/rfcr is set to CPMFCR_GBL */
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if (spi->mode & SPI_LSB_FIRST &&
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bits_per_word > 8)
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return -EINVAL;
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if (bits_per_word > 8)
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return 8; /* pretend its 8 bits */
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return bits_per_word;
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}
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static int fsl_spi_setup_transfer(struct spi_device *spi,
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struct spi_transfer *t)
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{
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struct mpc8xxx_spi *mpc8xxx_spi;
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int bits_per_word = 0;
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u8 pm;
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u32 hz = 0;
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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mpc8xxx_spi = spi_master_get_devdata(spi->master);
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if (t) {
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bits_per_word = t->bits_per_word;
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hz = t->speed_hz;
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}
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/* spi_transfer level calls that work per-word */
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if (!bits_per_word)
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bits_per_word = spi->bits_per_word;
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/* Make sure its a bit width we support [4..16, 32] */
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if ((bits_per_word < 4)
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|| ((bits_per_word > 16) && (bits_per_word != 32)))
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return -EINVAL;
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if (!hz)
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hz = spi->max_speed_hz;
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if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
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bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
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mpc8xxx_spi,
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bits_per_word);
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else if (mpc8xxx_spi->flags & SPI_QE)
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bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
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bits_per_word);
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if (bits_per_word < 0)
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return bits_per_word;
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if (bits_per_word == 32)
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bits_per_word = 0;
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else
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bits_per_word = bits_per_word - 1;
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/* mask out bits we are going to set */
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cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
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| SPMODE_PM(0xF));
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cs->hw_mode |= SPMODE_LEN(bits_per_word);
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if ((mpc8xxx_spi->spibrg / hz) > 64) {
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cs->hw_mode |= SPMODE_DIV16;
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pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
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WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
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"Will use %d Hz instead.\n", dev_name(&spi->dev),
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hz, mpc8xxx_spi->spibrg / 1024);
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if (pm > 16)
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pm = 16;
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} else {
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pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
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}
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if (pm)
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pm--;
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cs->hw_mode |= SPMODE_PM(pm);
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fsl_spi_change_mode(spi);
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return 0;
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}
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static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi)
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{
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struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd;
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struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd;
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unsigned int xfer_len = min(mspi->count, SPI_MRBLR);
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unsigned int xfer_ofs;
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struct fsl_spi_reg *reg_base = mspi->reg_base;
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xfer_ofs = mspi->xfer_in_progress->len - mspi->count;
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if (mspi->rx_dma == mspi->dma_dummy_rx)
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out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma);
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else
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out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs);
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out_be16(&rx_bd->cbd_datlen, 0);
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out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP);
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if (mspi->tx_dma == mspi->dma_dummy_tx)
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out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma);
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else
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out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs);
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out_be16(&tx_bd->cbd_datlen, xfer_len);
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out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP |
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BD_SC_LAST);
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/* start transfer */
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mpc8xxx_spi_write_reg(®_base->command, SPCOM_STR);
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}
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static int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi,
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struct spi_transfer *t, bool is_dma_mapped)
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{
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struct device *dev = mspi->dev;
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struct fsl_spi_reg *reg_base = mspi->reg_base;
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if (is_dma_mapped) {
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mspi->map_tx_dma = 0;
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mspi->map_rx_dma = 0;
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} else {
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mspi->map_tx_dma = 1;
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mspi->map_rx_dma = 1;
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}
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if (!t->tx_buf) {
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mspi->tx_dma = mspi->dma_dummy_tx;
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mspi->map_tx_dma = 0;
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}
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if (!t->rx_buf) {
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mspi->rx_dma = mspi->dma_dummy_rx;
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mspi->map_rx_dma = 0;
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}
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if (mspi->map_tx_dma) {
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void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */
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mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len,
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DMA_TO_DEVICE);
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if (dma_mapping_error(dev, mspi->tx_dma)) {
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dev_err(dev, "unable to map tx dma\n");
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return -ENOMEM;
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}
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} else if (t->tx_buf) {
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mspi->tx_dma = t->tx_dma;
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}
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if (mspi->map_rx_dma) {
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mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len,
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DMA_FROM_DEVICE);
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if (dma_mapping_error(dev, mspi->rx_dma)) {
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dev_err(dev, "unable to map rx dma\n");
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goto err_rx_dma;
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}
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} else if (t->rx_buf) {
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mspi->rx_dma = t->rx_dma;
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}
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/* enable rx ints */
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mpc8xxx_spi_write_reg(®_base->mask, SPIE_RXB);
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mspi->xfer_in_progress = t;
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mspi->count = t->len;
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/* start CPM transfers */
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fsl_spi_cpm_bufs_start(mspi);
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return 0;
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err_rx_dma:
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if (mspi->map_tx_dma)
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dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
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return -ENOMEM;
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}
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static void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi)
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{
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struct device *dev = mspi->dev;
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struct spi_transfer *t = mspi->xfer_in_progress;
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if (mspi->map_tx_dma)
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dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE);
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if (mspi->map_rx_dma)
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dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE);
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mspi->xfer_in_progress = NULL;
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}
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|
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static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
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struct spi_transfer *t, unsigned int len)
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{
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u32 word;
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struct fsl_spi_reg *reg_base = mspi->reg_base;
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mspi->count = len;
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/* enable rx ints */
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mpc8xxx_spi_write_reg(®_base->mask, SPIM_NE);
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/* transmit word */
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word = mspi->get_tx(mspi);
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mpc8xxx_spi_write_reg(®_base->transmit, word);
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return 0;
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}
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|
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static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
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bool is_dma_mapped)
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{
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struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
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struct fsl_spi_reg *reg_base;
|
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unsigned int len = t->len;
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u8 bits_per_word;
|
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int ret;
|
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|
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reg_base = mpc8xxx_spi->reg_base;
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bits_per_word = spi->bits_per_word;
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if (t->bits_per_word)
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bits_per_word = t->bits_per_word;
|
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|
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if (bits_per_word > 8) {
|
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/* invalid length? */
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if (len & 1)
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return -EINVAL;
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len /= 2;
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}
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if (bits_per_word > 16) {
|
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/* invalid length? */
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if (len & 1)
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return -EINVAL;
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len /= 2;
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}
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|
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mpc8xxx_spi->tx = t->tx_buf;
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mpc8xxx_spi->rx = t->rx_buf;
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|
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INIT_COMPLETION(mpc8xxx_spi->done);
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if (mpc8xxx_spi->flags & SPI_CPM_MODE)
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ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
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else
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ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
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if (ret)
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return ret;
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|
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wait_for_completion(&mpc8xxx_spi->done);
|
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|
|
/* 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 void fsl_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 = 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;
|
|
m->complete(m->context);
|
|
|
|
if (status || !cs_change) {
|
|
ndelay(nsecs);
|
|
fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
|
|
}
|
|
|
|
fsl_spi_setup_transfer(spi, NULL);
|
|
}
|
|
|
|
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->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;
|
|
}
|
|
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;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void fsl_spi_cpm_irq(struct mpc8xxx_spi *mspi, u32 events)
|
|
{
|
|
u16 len;
|
|
struct fsl_spi_reg *reg_base = mspi->reg_base;
|
|
|
|
dev_dbg(mspi->dev, "%s: bd datlen %d, count %d\n", __func__,
|
|
in_be16(&mspi->rx_bd->cbd_datlen), mspi->count);
|
|
|
|
len = in_be16(&mspi->rx_bd->cbd_datlen);
|
|
if (len > mspi->count) {
|
|
WARN_ON(1);
|
|
len = mspi->count;
|
|
}
|
|
|
|
/* Clear the events */
|
|
mpc8xxx_spi_write_reg(®_base->event, events);
|
|
|
|
mspi->count -= len;
|
|
if (mspi->count)
|
|
fsl_spi_cpm_bufs_start(mspi);
|
|
else
|
|
complete(&mspi->done);
|
|
}
|
|
|
|
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_alloc_dummy_rx(void)
|
|
{
|
|
mutex_lock(&fsl_dummy_rx_lock);
|
|
|
|
if (!fsl_dummy_rx)
|
|
fsl_dummy_rx = kmalloc(SPI_MRBLR, GFP_KERNEL);
|
|
if (fsl_dummy_rx)
|
|
fsl_dummy_rx_refcnt++;
|
|
|
|
mutex_unlock(&fsl_dummy_rx_lock);
|
|
|
|
return fsl_dummy_rx;
|
|
}
|
|
|
|
static void fsl_spi_free_dummy_rx(void)
|
|
{
|
|
mutex_lock(&fsl_dummy_rx_lock);
|
|
|
|
switch (fsl_dummy_rx_refcnt) {
|
|
case 0:
|
|
WARN_ON(1);
|
|
break;
|
|
case 1:
|
|
kfree(fsl_dummy_rx);
|
|
fsl_dummy_rx = NULL;
|
|
/* fall through */
|
|
default:
|
|
fsl_dummy_rx_refcnt--;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&fsl_dummy_rx_lock);
|
|
}
|
|
|
|
static unsigned long fsl_spi_cpm_get_pram(struct mpc8xxx_spi *mspi)
|
|
{
|
|
struct device *dev = mspi->dev;
|
|
struct device_node *np = dev->of_node;
|
|
const u32 *iprop;
|
|
int size;
|
|
unsigned long spi_base_ofs;
|
|
unsigned long pram_ofs = -ENOMEM;
|
|
|
|
/* Can't use of_address_to_resource(), QE muram isn't at 0. */
|
|
iprop = of_get_property(np, "reg", &size);
|
|
|
|
/* QE with a fixed pram location? */
|
|
if (mspi->flags & SPI_QE && iprop && size == sizeof(*iprop) * 4)
|
|
return cpm_muram_alloc_fixed(iprop[2], SPI_PRAM_SIZE);
|
|
|
|
/* QE but with a dynamic pram location? */
|
|
if (mspi->flags & SPI_QE) {
|
|
pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
|
|
qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, mspi->subblock,
|
|
QE_CR_PROTOCOL_UNSPECIFIED, pram_ofs);
|
|
return pram_ofs;
|
|
}
|
|
|
|
/* CPM1 and CPM2 pram must be at a fixed addr. */
|
|
if (!iprop || size != sizeof(*iprop) * 4)
|
|
return -ENOMEM;
|
|
|
|
spi_base_ofs = cpm_muram_alloc_fixed(iprop[2], 2);
|
|
if (IS_ERR_VALUE(spi_base_ofs))
|
|
return -ENOMEM;
|
|
|
|
if (mspi->flags & SPI_CPM2) {
|
|
pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64);
|
|
if (!IS_ERR_VALUE(pram_ofs)) {
|
|
u16 __iomem *spi_base = cpm_muram_addr(spi_base_ofs);
|
|
|
|
out_be16(spi_base, pram_ofs);
|
|
}
|
|
} else {
|
|
struct spi_pram __iomem *pram = cpm_muram_addr(spi_base_ofs);
|
|
u16 rpbase = in_be16(&pram->rpbase);
|
|
|
|
/* Microcode relocation patch applied? */
|
|
if (rpbase)
|
|
pram_ofs = rpbase;
|
|
else
|
|
return spi_base_ofs;
|
|
}
|
|
|
|
cpm_muram_free(spi_base_ofs);
|
|
return pram_ofs;
|
|
}
|
|
|
|
static int fsl_spi_cpm_init(struct mpc8xxx_spi *mspi)
|
|
{
|
|
struct device *dev = mspi->dev;
|
|
struct device_node *np = dev->of_node;
|
|
const u32 *iprop;
|
|
int size;
|
|
unsigned long pram_ofs;
|
|
unsigned long bds_ofs;
|
|
|
|
if (!(mspi->flags & SPI_CPM_MODE))
|
|
return 0;
|
|
|
|
if (!fsl_spi_alloc_dummy_rx())
|
|
return -ENOMEM;
|
|
|
|
if (mspi->flags & SPI_QE) {
|
|
iprop = of_get_property(np, "cell-index", &size);
|
|
if (iprop && size == sizeof(*iprop))
|
|
mspi->subblock = *iprop;
|
|
|
|
switch (mspi->subblock) {
|
|
default:
|
|
dev_warn(dev, "cell-index unspecified, assuming SPI1");
|
|
/* fall through */
|
|
case 0:
|
|
mspi->subblock = QE_CR_SUBBLOCK_SPI1;
|
|
break;
|
|
case 1:
|
|
mspi->subblock = QE_CR_SUBBLOCK_SPI2;
|
|
break;
|
|
}
|
|
}
|
|
|
|
pram_ofs = fsl_spi_cpm_get_pram(mspi);
|
|
if (IS_ERR_VALUE(pram_ofs)) {
|
|
dev_err(dev, "can't allocate spi parameter ram\n");
|
|
goto err_pram;
|
|
}
|
|
|
|
bds_ofs = cpm_muram_alloc(sizeof(*mspi->tx_bd) +
|
|
sizeof(*mspi->rx_bd), 8);
|
|
if (IS_ERR_VALUE(bds_ofs)) {
|
|
dev_err(dev, "can't allocate bds\n");
|
|
goto err_bds;
|
|
}
|
|
|
|
mspi->dma_dummy_tx = dma_map_single(dev, empty_zero_page, PAGE_SIZE,
|
|
DMA_TO_DEVICE);
|
|
if (dma_mapping_error(dev, mspi->dma_dummy_tx)) {
|
|
dev_err(dev, "unable to map dummy tx buffer\n");
|
|
goto err_dummy_tx;
|
|
}
|
|
|
|
mspi->dma_dummy_rx = dma_map_single(dev, fsl_dummy_rx, SPI_MRBLR,
|
|
DMA_FROM_DEVICE);
|
|
if (dma_mapping_error(dev, mspi->dma_dummy_rx)) {
|
|
dev_err(dev, "unable to map dummy rx buffer\n");
|
|
goto err_dummy_rx;
|
|
}
|
|
|
|
mspi->pram = cpm_muram_addr(pram_ofs);
|
|
|
|
mspi->tx_bd = cpm_muram_addr(bds_ofs);
|
|
mspi->rx_bd = cpm_muram_addr(bds_ofs + sizeof(*mspi->tx_bd));
|
|
|
|
/* Initialize parameter ram. */
|
|
out_be16(&mspi->pram->tbase, cpm_muram_offset(mspi->tx_bd));
|
|
out_be16(&mspi->pram->rbase, cpm_muram_offset(mspi->rx_bd));
|
|
out_8(&mspi->pram->tfcr, CPMFCR_EB | CPMFCR_GBL);
|
|
out_8(&mspi->pram->rfcr, CPMFCR_EB | CPMFCR_GBL);
|
|
out_be16(&mspi->pram->mrblr, SPI_MRBLR);
|
|
out_be32(&mspi->pram->rstate, 0);
|
|
out_be32(&mspi->pram->rdp, 0);
|
|
out_be16(&mspi->pram->rbptr, 0);
|
|
out_be16(&mspi->pram->rbc, 0);
|
|
out_be32(&mspi->pram->rxtmp, 0);
|
|
out_be32(&mspi->pram->tstate, 0);
|
|
out_be32(&mspi->pram->tdp, 0);
|
|
out_be16(&mspi->pram->tbptr, 0);
|
|
out_be16(&mspi->pram->tbc, 0);
|
|
out_be32(&mspi->pram->txtmp, 0);
|
|
|
|
return 0;
|
|
|
|
err_dummy_rx:
|
|
dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
|
|
err_dummy_tx:
|
|
cpm_muram_free(bds_ofs);
|
|
err_bds:
|
|
cpm_muram_free(pram_ofs);
|
|
err_pram:
|
|
fsl_spi_free_dummy_rx();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi)
|
|
{
|
|
struct device *dev = mspi->dev;
|
|
|
|
dma_unmap_single(dev, mspi->dma_dummy_rx, SPI_MRBLR, DMA_FROM_DEVICE);
|
|
dma_unmap_single(dev, mspi->dma_dummy_tx, PAGE_SIZE, DMA_TO_DEVICE);
|
|
cpm_muram_free(cpm_muram_offset(mspi->tx_bd));
|
|
cpm_muram_free(cpm_muram_offset(mspi->pram));
|
|
fsl_spi_free_dummy_rx();
|
|
}
|
|
|
|
static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
|
|
{
|
|
iounmap(mspi->reg_base);
|
|
fsl_spi_cpm_free(mspi);
|
|
}
|
|
|
|
static struct spi_master * __devinit fsl_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 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);
|
|
|
|
ret = mpc8xxx_spi_probe(dev, mem, irq);
|
|
if (ret)
|
|
goto err_probe;
|
|
|
|
master->setup = fsl_spi_setup;
|
|
|
|
mpc8xxx_spi = spi_master_get_devdata(master);
|
|
mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
|
|
mpc8xxx_spi->spi_remove = fsl_spi_remove;
|
|
|
|
|
|
ret = fsl_spi_cpm_init(mpc8xxx_spi);
|
|
if (ret)
|
|
goto err_cpm_init;
|
|
|
|
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
|
|
mpc8xxx_spi->rx_shift = 16;
|
|
mpc8xxx_spi->tx_shift = 24;
|
|
}
|
|
|
|
mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
|
|
if (mpc8xxx_spi->reg_base == NULL) {
|
|
ret = -ENOMEM;
|
|
goto err_ioremap;
|
|
}
|
|
|
|
/* 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->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:
|
|
err_probe:
|
|
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;
|
|
struct mpc8xxx_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_fsl_spi_get_chipselects(struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct fsl_spi_platform_data *pdata = dev->platform_data;
|
|
struct mpc8xxx_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);
|
|
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->platform_data;
|
|
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 __devinit 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;
|
|
struct resource irq;
|
|
int ret = -ENOMEM;
|
|
|
|
ret = of_mpc8xxx_spi_probe(ofdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = of_fsl_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 = fsl_spi_probe(dev, &mem, irq.start);
|
|
if (IS_ERR(master)) {
|
|
ret = PTR_ERR(master);
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
of_fsl_spi_free_chipselects(dev);
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit of_fsl_spi_remove(struct platform_device *ofdev)
|
|
{
|
|
int ret;
|
|
|
|
ret = mpc8xxx_spi_remove(&ofdev->dev);
|
|
if (ret)
|
|
return ret;
|
|
of_fsl_spi_free_chipselects(&ofdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id of_fsl_spi_match[] = {
|
|
{ .compatible = "fsl,spi" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
|
|
|
|
static struct platform_driver of_fsl_spi_driver = {
|
|
.driver = {
|
|
.name = "fsl_spi",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = of_fsl_spi_match,
|
|
},
|
|
.probe = of_fsl_spi_probe,
|
|
.remove = __devexit_p(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 __devinit plat_mpc8xxx_spi_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *mem;
|
|
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 <= 0)
|
|
return -EINVAL;
|
|
|
|
master = fsl_spi_probe(&pdev->dev, mem, irq);
|
|
if (IS_ERR(master))
|
|
return PTR_ERR(master);
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit 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 = __devexit_p(plat_mpc8xxx_spi_remove),
|
|
.driver = {
|
|
.name = "mpc8xxx_spi",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
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");
|