Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
 */
#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);
<------><------>}
<------>}
}
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);
}
 
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;
}
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;
}
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);
}
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;
}
 
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;
<------><------>fallthrough;
<------>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;
<------>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;
}
 
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");
<------><------><------>fallthrough;
<------><------>case 0:
<------><------><------>mspi->subblock = QE_CR_SUBBLOCK_SPI1;
<------><------><------>break;
<------><------>case 1:
<------><------><------>mspi->subblock = QE_CR_SUBBLOCK_SPI2;
<------><------><------>break;
<------><------>}
<------>}
 
<------>if (mspi->flags & SPI_CPM1) {
<------><------>void *pram;
 
<------><------>pram = devm_platform_ioremap_resource(to_platform_device(dev),
<------><------><------><------><------><------>      1);
<------><------>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;
}
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));
<------>if (!(mspi->flags & SPI_CPM1))
<------><------>cpm_muram_free(cpm_muram_offset(mspi->pram));
<------>fsl_spi_free_dummy_rx();
}
EXPORT_SYMBOL_GPL(fsl_spi_cpm_free);
 
MODULE_LICENSE("GPL");