337 lines
10 KiB
C
337 lines
10 KiB
C
/*
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* Copyright (c) 2001 Navin Boppuri / Prashant Patel
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* <nboppuri@trinetcommunication.com>,
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* <pmpatel@trinetcommunication.com>
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* Copyright (c) 2001 Gerd Mennchen <Gerd.Mennchen@icn.siemens.de>
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* Copyright (c) 2001 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* MPC8xx CPM SPI interface.
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*
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* Parts of this code are probably not portable and/or specific to
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* the board which I used for the tests. Please send fixes/complaints
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* to wd@denx.de
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*
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*/
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#include <common.h>
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#include <mpc8xx.h>
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#include <commproc.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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#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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{
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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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/* 1 */
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/* ------------------------------------------------
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* Initialize Port B SPI pins -> page 34-8 MPC860UM
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* (we are only in Master Mode !)
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* ------------------------------------------------ */
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/* --------------------------------------------
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* GPIO or per. Function
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* PBPAR[28] = 1 [0x00000008] -> PERI: (SPIMISO)
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* PBPAR[29] = 1 [0x00000004] -> PERI: (SPIMOSI)
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* PBPAR[30] = 1 [0x00000002] -> PERI: (SPICLK)
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* PBPAR[31] = 0 [0x00000001] -> GPIO: (CS for PCUE/CCM-EEPROM)
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* -------------------------------------------- */
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clrsetbits_be32(&cp->cp_pbpar, 0x00000001, 0x0000000E); /* set bits */
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/* ----------------------------------------------
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* In/Out or per. Function 0/1
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* PBDIR[28] = 1 [0x00000008] -> PERI1: SPIMISO
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* PBDIR[29] = 1 [0x00000004] -> PERI1: SPIMOSI
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* PBDIR[30] = 1 [0x00000002] -> PERI1: SPICLK
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* PBDIR[31] = 1 [0x00000001] -> GPIO OUT: CS for PCUE/CCM-EEPROM
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* ---------------------------------------------- */
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setbits_be32(&cp->cp_pbdir, 0x0000000F);
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/* ----------------------------------------------
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* open drain or active output
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* PBODR[28] = 1 [0x00000008] -> open drain: SPIMISO
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* PBODR[29] = 0 [0x00000004] -> active output SPIMOSI
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* PBODR[30] = 0 [0x00000002] -> active output: SPICLK
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* PBODR[31] = 0 [0x00000001] -> active output GPIO OUT: CS for PCUE/CCM
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* ---------------------------------------------- */
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clrsetbits_be16(&cp->cp_pbodr, 0x00000007, 0x00000008);
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/* Initialize the parameter ram.
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* We need to make sure many things are initialized to zero
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*/
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out_be32(&spi->spi_rstate, 0);
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out_be32(&spi->spi_rdp, 0);
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out_be16(&spi->spi_rbptr, 0);
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out_be16(&spi->spi_rbc, 0);
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out_be32(&spi->spi_rxtmp, 0);
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out_be32(&spi->spi_tstate, 0);
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out_be32(&spi->spi_tdp, 0);
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out_be16(&spi->spi_tbptr, 0);
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out_be16(&spi->spi_tbc, 0);
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out_be32(&spi->spi_txtmp, 0);
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/* 3 */
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/* Set up the SPI parameters in the parameter ram */
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out_be16(&spi->spi_rbase, CPM_SPI_BASE_RX);
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out_be16(&spi->spi_tbase, CPM_SPI_BASE_TX);
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/***********IMPORTANT******************/
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/*
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* Setting transmit and receive buffer descriptor pointers
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* initially to rbase and tbase. Only the microcode patches
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* documentation talks about initializing this pointer. This
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* is missing from the sample I2C driver. If you dont
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* initialize these pointers, the kernel hangs.
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*/
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out_be16(&spi->spi_rbptr, CPM_SPI_BASE_RX);
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out_be16(&spi->spi_tbptr, CPM_SPI_BASE_TX);
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/* 4 */
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/* Init SPI Tx + Rx Parameters */
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while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)
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;
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out_be16(&cp->cp_cpcr, mk_cr_cmd(CPM_CR_CH_SPI, CPM_CR_INIT_TRX) |
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CPM_CR_FLG);
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while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG)
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;
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/* 5 */
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/* Set SDMA configuration register */
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out_be32(&immr->im_siu_conf.sc_sdcr, 0x0001);
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/* 6 */
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/* Set to big endian. */
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out_8(&spi->spi_tfcr, SMC_EB);
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out_8(&spi->spi_rfcr, SMC_EB);
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/* 7 */
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/* Set maximum receive size. */
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out_be16(&spi->spi_mrblr, MAX_BUFFER);
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/* 8 + 9 */
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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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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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}
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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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{
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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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/* Disable relocation */
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out_be16(&spi->spi_rpbase, 0);
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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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/* Set CS for device */
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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_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_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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clrsetbits_be16(&cp->cp_spmode, ~SPMODE_LOOP, SPMODE_REV | SPMODE_MSTR |
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SPMODE_EN | SPMODE_LEN(8) | SPMODE_PM(0x8));
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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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/* start spi transfer */
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setbits_8(&cp->cp_spcom, SPI_STR); /* Start transmit */
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/* --------------------------------
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* Wait for SPI transmit to get out
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* or time out (1 second = 1000 ms)
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* -------------------------------- */
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for (tm = 0; tm < 1000; ++tm) {
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if (in_8(&cp->cp_spie) & SPI_TXB) /* Tx Buffer Empty */
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break;
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if ((in_be16(&tbdf->cbd_sc) & BD_SC_READY) == 0)
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break;
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udelay(1000);
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}
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if (tm >= 1000)
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printf("*** spi_xfer: Time out while xferring to/from SPI!\n");
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/* Clear CS for device */
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setbits_be32(&cp->cp_pbdat, 0x0001);
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return count;
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}
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