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Release 4.14 drivers/spi/spi-fsl-cpm.c

Directory: drivers/spi
/*
 * Freescale SPI controller driver cpm functions.
 *
 * 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>
 *
 * 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 <asm/cpm.h>
#include <soc/fsl/qe/qe.h>
#include <linux/dma-mapping.h>
#include <linux/fsl_devices.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
#include <linux/platform_device.h>

#include "spi-fsl-cpm.h"
#include "spi-fsl-lib.h"
#include "spi-fsl-spi.h"

/* CPM1 and CPM2 are mutually exclusive. */
#ifdef CONFIG_CPM1
#include <asm/cpm1.h>

#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_CH_SPI, 0)
#else
#include <asm/cpm2.h>

#define CPM_SPI_CMD mk_cr_cmd(CPM_CR_SPI_PAGE, CPM_CR_SPI_SBLOCK, 0, 0)
#endif


#define	SPIE_TXB	0x00000200	
/* Last char is written to tx fifo */

#define	SPIE_RXB	0x00000100	
/* Last char is written to rx buf */

/* SPCOM register values */

#define	SPCOM_STR	(1 << 23)	
/* Start transmit */


#define	SPI_PRAM_SIZE	0x100

#define	SPI_MRBLR	((unsigned int)PAGE_SIZE)


static void *fsl_dummy_rx;
static DEFINE_MUTEX(fsl_dummy_rx_lock);

static int fsl_dummy_rx_refcnt;


void fsl_spi_cpm_reinit_txrx(struct mpc8xxx_spi *mspi) { if (mspi->flags & SPI_QE) { qe_issue_cmd(QE_INIT_TX_RX, mspi->subblock, QE_CR_PROTOCOL_UNSPECIFIED, 0); } else { if (mspi->flags & SPI_CPM1) { out_be32(&mspi->pram->rstate, 0); out_be16(&mspi->pram->rbptr, in_be16(&mspi->pram->rbase)); out_be32(&mspi->pram->tstate, 0); out_be16(&mspi->pram->tbptr, in_be16(&mspi->pram->tbase)); } else { cpm_command(CPM_SPI_CMD, CPM_CR_INIT_TRX); } } }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_reinit_txrx);
static void fsl_spi_cpm_bufs_start(struct mpc8xxx_spi *mspi) { struct cpm_buf_desc __iomem *tx_bd = mspi->tx_bd; struct cpm_buf_desc __iomem *rx_bd = mspi->rx_bd; unsigned int xfer_len = min(mspi->count, SPI_MRBLR); unsigned int xfer_ofs; struct fsl_spi_reg *reg_base = mspi->reg_base; xfer_ofs = mspi->xfer_in_progress->len - mspi->count; if (mspi->rx_dma == mspi->dma_dummy_rx) out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma); else out_be32(&rx_bd->cbd_bufaddr, mspi->rx_dma + xfer_ofs); out_be16(&rx_bd->cbd_datlen, 0); out_be16(&rx_bd->cbd_sc, BD_SC_EMPTY | BD_SC_INTRPT | BD_SC_WRAP); if (mspi->tx_dma == mspi->dma_dummy_tx) out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma); else out_be32(&tx_bd->cbd_bufaddr, mspi->tx_dma + xfer_ofs); out_be16(&tx_bd->cbd_datlen, xfer_len); out_be16(&tx_bd->cbd_sc, BD_SC_READY | BD_SC_INTRPT | BD_SC_WRAP | BD_SC_LAST); /* start transfer */ mpc8xxx_spi_write_reg(&reg_base->command, SPCOM_STR); }

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int fsl_spi_cpm_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t, bool is_dma_mapped) { struct device *dev = mspi->dev; struct fsl_spi_reg *reg_base = mspi->reg_base; if (is_dma_mapped) { mspi->map_tx_dma = 0; mspi->map_rx_dma = 0; } else { mspi->map_tx_dma = 1; mspi->map_rx_dma = 1; } if (!t->tx_buf) { mspi->tx_dma = mspi->dma_dummy_tx; mspi->map_tx_dma = 0; } if (!t->rx_buf) { mspi->rx_dma = mspi->dma_dummy_rx; mspi->map_rx_dma = 0; } if (mspi->map_tx_dma) { void *nonconst_tx = (void *)mspi->tx; /* shut up gcc */ mspi->tx_dma = dma_map_single(dev, nonconst_tx, t->len, DMA_TO_DEVICE); if (dma_mapping_error(dev, mspi->tx_dma)) { dev_err(dev, "unable to map tx dma\n"); return -ENOMEM; } } else if (t->tx_buf) { mspi->tx_dma = t->tx_dma; } if (mspi->map_rx_dma) { mspi->rx_dma = dma_map_single(dev, mspi->rx, t->len, DMA_FROM_DEVICE); if (dma_mapping_error(dev, mspi->rx_dma)) { dev_err(dev, "unable to map rx dma\n"); goto err_rx_dma; } } else if (t->rx_buf) { mspi->rx_dma = t->rx_dma; } /* enable rx ints */ mpc8xxx_spi_write_reg(&reg_base->mask, SPIE_RXB); mspi->xfer_in_progress = t; mspi->count = t->len; /* start CPM transfers */ fsl_spi_cpm_bufs_start(mspi); return 0; err_rx_dma: if (mspi->map_tx_dma) dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); return -ENOMEM; }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs);
void fsl_spi_cpm_bufs_complete(struct mpc8xxx_spi *mspi) { struct device *dev = mspi->dev; struct spi_transfer *t = mspi->xfer_in_progress; if (mspi->map_tx_dma) dma_unmap_single(dev, mspi->tx_dma, t->len, DMA_TO_DEVICE); if (mspi->map_rx_dma) dma_unmap_single(dev, mspi->rx_dma, t->len, DMA_FROM_DEVICE); mspi->xfer_in_progress = NULL; }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_bufs_complete);
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(&reg_base->event, events); mspi->count -= len; if (mspi->count) fsl_spi_cpm_bufs_start(mspi); else complete(&mspi->done); }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_irq);
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; }

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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); }

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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; void __iomem *spi_base; 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; } spi_base = of_iomap(np, 1); if (spi_base == NULL) return -EINVAL; if (mspi->flags & SPI_CPM2) { pram_ofs = cpm_muram_alloc(SPI_PRAM_SIZE, 64); out_be16(spi_base, pram_ofs); } iounmap(spi_base); return pram_ofs; }

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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 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\n"); /* fall through */ case 0: mspi->subblock = QE_CR_SUBBLOCK_SPI1; break; case 1: mspi->subblock = QE_CR_SUBBLOCK_SPI2; break; } } if (mspi->flags & SPI_CPM1) { struct resource *res; void *pram; res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 1); pram = devm_ioremap_resource(dev, res); if (IS_ERR(pram)) mspi->pram = NULL; else mspi->pram = pram; } else { unsigned long pram_ofs = fsl_spi_cpm_get_pram(mspi); if (IS_ERR_VALUE(pram_ofs)) mspi->pram = NULL; else mspi->pram = cpm_muram_addr(pram_ofs); } if (mspi->pram == NULL) { 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->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: if (!(mspi->flags & SPI_CPM1)) cpm_muram_free(cpm_muram_offset(mspi->pram)); err_pram: fsl_spi_free_dummy_rx(); return -ENOMEM; }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_init);
void fsl_spi_cpm_free(struct mpc8xxx_spi *mspi) { struct device *dev = mspi->dev; if (!(mspi->flags & SPI_CPM_MODE)) return; 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(); }

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EXPORT_SYMBOL_GPL(fsl_spi_cpm_free); MODULE_LICENSE("GPL");

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Directory: drivers/spi
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