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spi, mpc8xx: migrate to DM_SPI
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
This commit is contained in:
Christophe Leroy
Tom Rini
parent
c1cd921b75
commit
fb0204e48b
@ -17,64 +17,19 @@
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*/
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#include <common.h>
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#include <dm.h>
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#include <mpc8xx.h>
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#include <spi.h>
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#include <asm/cpm_8xx.h>
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#include <linux/ctype.h>
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#include <malloc.h>
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#include <post.h>
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#include <serial.h>
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#define SPI_EEPROM_WREN 0x06
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#define SPI_EEPROM_RDSR 0x05
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#define SPI_EEPROM_READ 0x03
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#define SPI_EEPROM_WRITE 0x02
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/* ---------------------------------------------------------------
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* Offset for initial SPI buffers in DPRAM:
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* We need a 520 byte scratch DPRAM area to use at an early stage.
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* It is used between the two initialization calls (spi_init_f()
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* and spi_init_r()).
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* The value 0xb00 makes it far enough from the start of the data
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* area (as well as from the stack pointer).
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* --------------------------------------------------------------- */
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#ifndef CONFIG_SYS_SPI_INIT_OFFSET
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#define CONFIG_SYS_SPI_INIT_OFFSET 0xB00
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#endif
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#include <asm/io.h>
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#define CPM_SPI_BASE_RX CPM_SPI_BASE
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#define CPM_SPI_BASE_TX (CPM_SPI_BASE + sizeof(cbd_t))
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/* -------------------
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* Function prototypes
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* ------------------- */
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ssize_t spi_xfer(size_t);
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/* -------------------
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* Variables
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* ------------------- */
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#define MAX_BUFFER 0x104
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/* ----------------------------------------------------------------------
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* Initially we place the RX and TX buffers at a fixed location in DPRAM!
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* ---------------------------------------------------------------------- */
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static uchar *rxbuf =
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(uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem
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[CONFIG_SYS_SPI_INIT_OFFSET];
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static uchar *txbuf =
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(uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem
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[CONFIG_SYS_SPI_INIT_OFFSET+MAX_BUFFER];
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/* **************************************************************************
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*
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* Function: spi_init_f
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*
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* Description: Init SPI-Controller (ROM part)
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*
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* return: ---
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*
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* *********************************************************************** */
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void spi_init_f(void)
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static int mpc8xx_spi_probe(struct udevice *dev)
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{
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immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
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cpm8xx_t __iomem *cp = &immr->im_cpm;
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@ -180,117 +135,24 @@ void spi_init_f(void)
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clrbits_be16(&tbdf->cbd_sc, BD_SC_READY);
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clrbits_be16(&rbdf->cbd_sc, BD_SC_EMPTY);
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/* Set the bd's rx and tx buffer address pointers */
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out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf);
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out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf);
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/* 10 + 11 */
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out_8(&cp->cp_spim, 0); /* Mask all SPI events */
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out_8(&cp->cp_spie, SPI_EMASK); /* Clear all SPI events */
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return;
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return 0;
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}
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/* **************************************************************************
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*
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* Function: spi_init_r
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*
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* Description: Init SPI-Controller (RAM part) -
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* The malloc engine is ready and we can move our buffers to
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* normal RAM
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*
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* return: ---
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*
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* *********************************************************************** */
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void spi_init_r(void)
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static int mpc8xx_spi_xfer(struct udevice *dev, unsigned int bitlen,
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const void *dout, void *din, unsigned long flags)
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{
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immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
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cpm8xx_t __iomem *cp = &immr->im_cpm;
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spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI];
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cbd_t __iomem *tbdf, *rbdf;
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/* Disable relocation */
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out_be16(&spi->spi_rpbase, 0);
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/* tx and rx buffer descriptors */
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tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX];
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rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX];
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/* Allocate memory for RX and TX buffers */
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rxbuf = (uchar *)malloc(MAX_BUFFER);
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txbuf = (uchar *)malloc(MAX_BUFFER);
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out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf);
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out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf);
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return;
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}
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/****************************************************************************
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* Function: spi_write
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**************************************************************************** */
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ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len)
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{
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int i;
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memset(rxbuf, 0, MAX_BUFFER);
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memset(txbuf, 0, MAX_BUFFER);
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*txbuf = SPI_EEPROM_WREN; /* write enable */
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spi_xfer(1);
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memcpy(txbuf, addr, alen);
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*txbuf = SPI_EEPROM_WRITE; /* WRITE memory array */
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memcpy(alen + txbuf, buffer, len);
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spi_xfer(alen + len);
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/* ignore received data */
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for (i = 0; i < 1000; i++) {
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*txbuf = SPI_EEPROM_RDSR; /* read status */
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txbuf[1] = 0;
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spi_xfer(2);
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if (!(rxbuf[1] & 1))
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break;
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udelay(1000);
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}
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if (i >= 1000)
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printf("*** spi_write: Time out while writing!\n");
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return len;
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}
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/****************************************************************************
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* Function: spi_read
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**************************************************************************** */
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ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len)
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{
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memset(rxbuf, 0, MAX_BUFFER);
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memset(txbuf, 0, MAX_BUFFER);
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memcpy(txbuf, addr, alen);
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*txbuf = SPI_EEPROM_READ; /* READ memory array */
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/*
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* There is a bug in 860T (?) that cuts the last byte of input
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* if we're reading into DPRAM. The solution we choose here is
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* to always read len+1 bytes (we have one extra byte at the
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* end of the buffer).
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*/
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spi_xfer(alen + len + 1);
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memcpy(buffer, alen + rxbuf, len);
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return len;
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}
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/****************************************************************************
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* Function: spi_xfer
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**************************************************************************** */
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ssize_t spi_xfer(size_t count)
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{
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immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR;
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cpm8xx_t __iomem *cp = &immr->im_cpm;
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spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI];
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cbd_t __iomem *tbdf, *rbdf;
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int tm;
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size_t count = (bitlen + 7) / 8;
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/* Disable relocation */
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out_be16(&spi->spi_rpbase, 0);
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if (count > MAX_BUFFER)
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return -EINVAL;
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tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX];
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rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX];
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@ -299,10 +161,12 @@ ssize_t spi_xfer(size_t count)
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clrbits_be32(&cp->cp_pbdat, 0x0001);
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/* Setting tx bd status and data length */
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out_be32(&tbdf->cbd_bufaddr, (ulong)dout);
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out_be16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_LAST | BD_SC_WRAP);
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out_be16(&tbdf->cbd_datlen, count);
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/* Setting rx bd status and data length */
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out_be32(&rbdf->cbd_bufaddr, (ulong)din);
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out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_WRAP);
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out_be16(&rbdf->cbd_datlen, 0); /* rx length has no significance */
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@ -333,3 +197,20 @@ ssize_t spi_xfer(size_t count)
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return count;
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}
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static const struct dm_spi_ops mpc8xx_spi_ops = {
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.xfer = mpc8xx_spi_xfer,
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};
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static const struct udevice_id mpc8xx_spi_ids[] = {
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{ .compatible = "fsl,mpc8xx-spi" },
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{ }
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};
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U_BOOT_DRIVER(mpc8xx_spi) = {
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.name = "mpc8xx_spi",
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.id = UCLASS_SPI,
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.of_match = mpc8xx_spi_ids,
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.ops = &mpc8xx_spi_ops,
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.probe = mpc8xx_spi_probe,
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};
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