/* * Copyright (c) 2001 Navin Boppuri / Prashant Patel * , * * Copyright (c) 2001 Gerd Mennchen * Copyright (c) 2001 Wolfgang Denk, DENX Software Engineering, . * * SPDX-License-Identifier: GPL-2.0+ */ /* * MPC8xx CPM SPI interface. * * Parts of this code are probably not portable and/or specific to * the board which I used for the tests. Please send fixes/complaints * to wd@denx.de * */ #include #include #include #include #include #include #include #ifdef CONFIG_SPI #define SPI_EEPROM_WREN 0x06 #define SPI_EEPROM_RDSR 0x05 #define SPI_EEPROM_READ 0x03 #define SPI_EEPROM_WRITE 0x02 /* --------------------------------------------------------------- * Offset for initial SPI buffers in DPRAM: * We need a 520 byte scratch DPRAM area to use at an early stage. * It is used between the two initialization calls (spi_init_f() * and spi_init_r()). * The value 0xb00 makes it far enough from the start of the data * area (as well as from the stack pointer). * --------------------------------------------------------------- */ #ifndef CONFIG_SYS_SPI_INIT_OFFSET #define CONFIG_SYS_SPI_INIT_OFFSET 0xB00 #endif #define CPM_SPI_BASE_RX CPM_SPI_BASE #define CPM_SPI_BASE_TX (CPM_SPI_BASE + sizeof(cbd_t)) /* ------------------- * Function prototypes * ------------------- */ ssize_t spi_xfer(size_t); /* ------------------- * Variables * ------------------- */ #define MAX_BUFFER 0x104 /* ---------------------------------------------------------------------- * Initially we place the RX and TX buffers at a fixed location in DPRAM! * ---------------------------------------------------------------------- */ static uchar *rxbuf = (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem [CONFIG_SYS_SPI_INIT_OFFSET]; static uchar *txbuf = (uchar *)&((cpm8xx_t *)&((immap_t *)CONFIG_SYS_IMMR)->im_cpm)->cp_dpmem [CONFIG_SYS_SPI_INIT_OFFSET+MAX_BUFFER]; /* ************************************************************************** * * Function: spi_init_f * * Description: Init SPI-Controller (ROM part) * * return: --- * * *********************************************************************** */ void spi_init_f(void) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI]; cbd_t __iomem *tbdf, *rbdf; /* Disable relocation */ out_be16(&spi->spi_rpbase, 0); /* 1 */ /* ------------------------------------------------ * Initialize Port B SPI pins -> page 34-8 MPC860UM * (we are only in Master Mode !) * ------------------------------------------------ */ /* -------------------------------------------- * GPIO or per. Function * PBPAR[28] = 1 [0x00000008] -> PERI: (SPIMISO) * PBPAR[29] = 1 [0x00000004] -> PERI: (SPIMOSI) * PBPAR[30] = 1 [0x00000002] -> PERI: (SPICLK) * PBPAR[31] = 0 [0x00000001] -> GPIO: (CS for PCUE/CCM-EEPROM) * -------------------------------------------- */ clrsetbits_be32(&cp->cp_pbpar, 0x00000001, 0x0000000E); /* set bits */ /* ---------------------------------------------- * In/Out or per. Function 0/1 * PBDIR[28] = 1 [0x00000008] -> PERI1: SPIMISO * PBDIR[29] = 1 [0x00000004] -> PERI1: SPIMOSI * PBDIR[30] = 1 [0x00000002] -> PERI1: SPICLK * PBDIR[31] = 1 [0x00000001] -> GPIO OUT: CS for PCUE/CCM-EEPROM * ---------------------------------------------- */ setbits_be32(&cp->cp_pbdir, 0x0000000F); /* ---------------------------------------------- * open drain or active output * PBODR[28] = 1 [0x00000008] -> open drain: SPIMISO * PBODR[29] = 0 [0x00000004] -> active output SPIMOSI * PBODR[30] = 0 [0x00000002] -> active output: SPICLK * PBODR[31] = 0 [0x00000001] -> active output GPIO OUT: CS for PCUE/CCM * ---------------------------------------------- */ clrsetbits_be16(&cp->cp_pbodr, 0x00000007, 0x00000008); /* Initialize the parameter ram. * We need to make sure many things are initialized to zero */ out_be32(&spi->spi_rstate, 0); out_be32(&spi->spi_rdp, 0); out_be16(&spi->spi_rbptr, 0); out_be16(&spi->spi_rbc, 0); out_be32(&spi->spi_rxtmp, 0); out_be32(&spi->spi_tstate, 0); out_be32(&spi->spi_tdp, 0); out_be16(&spi->spi_tbptr, 0); out_be16(&spi->spi_tbc, 0); out_be32(&spi->spi_txtmp, 0); /* 3 */ /* Set up the SPI parameters in the parameter ram */ out_be16(&spi->spi_rbase, CPM_SPI_BASE_RX); out_be16(&spi->spi_tbase, CPM_SPI_BASE_TX); /***********IMPORTANT******************/ /* * Setting transmit and receive buffer descriptor pointers * initially to rbase and tbase. Only the microcode patches * documentation talks about initializing this pointer. This * is missing from the sample I2C driver. If you dont * initialize these pointers, the kernel hangs. */ out_be16(&spi->spi_rbptr, CPM_SPI_BASE_RX); out_be16(&spi->spi_tbptr, CPM_SPI_BASE_TX); /* 4 */ /* Init SPI Tx + Rx Parameters */ while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG) ; out_be16(&cp->cp_cpcr, mk_cr_cmd(CPM_CR_CH_SPI, CPM_CR_INIT_TRX) | CPM_CR_FLG); while (in_be16(&cp->cp_cpcr) & CPM_CR_FLG) ; /* 5 */ /* Set SDMA configuration register */ out_be32(&immr->im_siu_conf.sc_sdcr, 0x0001); /* 6 */ /* Set to big endian. */ out_8(&spi->spi_tfcr, SMC_EB); out_8(&spi->spi_rfcr, SMC_EB); /* 7 */ /* Set maximum receive size. */ out_be16(&spi->spi_mrblr, MAX_BUFFER); /* 8 + 9 */ /* tx and rx buffer descriptors */ tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX]; rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX]; clrbits_be16(&tbdf->cbd_sc, BD_SC_READY); clrbits_be16(&rbdf->cbd_sc, BD_SC_EMPTY); /* Set the bd's rx and tx buffer address pointers */ out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf); out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf); /* 10 + 11 */ out_8(&cp->cp_spim, 0); /* Mask all SPI events */ out_8(&cp->cp_spie, SPI_EMASK); /* Clear all SPI events */ return; } /* ************************************************************************** * * Function: spi_init_r * * Description: Init SPI-Controller (RAM part) - * The malloc engine is ready and we can move our buffers to * normal RAM * * return: --- * * *********************************************************************** */ void spi_init_r(void) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI]; cbd_t __iomem *tbdf, *rbdf; /* Disable relocation */ out_be16(&spi->spi_rpbase, 0); /* tx and rx buffer descriptors */ tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX]; rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX]; /* Allocate memory for RX and TX buffers */ rxbuf = (uchar *)malloc(MAX_BUFFER); txbuf = (uchar *)malloc(MAX_BUFFER); out_be32(&rbdf->cbd_bufaddr, (ulong)rxbuf); out_be32(&tbdf->cbd_bufaddr, (ulong)txbuf); return; } /**************************************************************************** * Function: spi_write **************************************************************************** */ ssize_t spi_write(uchar *addr, int alen, uchar *buffer, int len) { int i; memset(rxbuf, 0, MAX_BUFFER); memset(txbuf, 0, MAX_BUFFER); *txbuf = SPI_EEPROM_WREN; /* write enable */ spi_xfer(1); memcpy(txbuf, addr, alen); *txbuf = SPI_EEPROM_WRITE; /* WRITE memory array */ memcpy(alen + txbuf, buffer, len); spi_xfer(alen + len); /* ignore received data */ for (i = 0; i < 1000; i++) { *txbuf = SPI_EEPROM_RDSR; /* read status */ txbuf[1] = 0; spi_xfer(2); if (!(rxbuf[1] & 1)) break; udelay(1000); } if (i >= 1000) printf("*** spi_write: Time out while writing!\n"); return len; } /**************************************************************************** * Function: spi_read **************************************************************************** */ ssize_t spi_read(uchar *addr, int alen, uchar *buffer, int len) { memset(rxbuf, 0, MAX_BUFFER); memset(txbuf, 0, MAX_BUFFER); memcpy(txbuf, addr, alen); *txbuf = SPI_EEPROM_READ; /* READ memory array */ /* * There is a bug in 860T (?) that cuts the last byte of input * if we're reading into DPRAM. The solution we choose here is * to always read len+1 bytes (we have one extra byte at the * end of the buffer). */ spi_xfer(alen + len + 1); memcpy(buffer, alen + rxbuf, len); return len; } /**************************************************************************** * Function: spi_xfer **************************************************************************** */ ssize_t spi_xfer(size_t count) { immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; cpm8xx_t __iomem *cp = &immr->im_cpm; spi_t __iomem *spi = (spi_t __iomem *)&cp->cp_dparam[PROFF_SPI]; cbd_t __iomem *tbdf, *rbdf; int tm; /* Disable relocation */ out_be16(&spi->spi_rpbase, 0); tbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_TX]; rbdf = (cbd_t __iomem *)&cp->cp_dpmem[CPM_SPI_BASE_RX]; /* Set CS for device */ clrbits_be32(&cp->cp_pbdat, 0x0001); /* Setting tx bd status and data length */ out_be16(&tbdf->cbd_sc, BD_SC_READY | BD_SC_LAST | BD_SC_WRAP); out_be16(&tbdf->cbd_datlen, count); /* Setting rx bd status and data length */ out_be16(&rbdf->cbd_sc, BD_SC_EMPTY | BD_SC_WRAP); out_be16(&rbdf->cbd_datlen, 0); /* rx length has no significance */ clrsetbits_be16(&cp->cp_spmode, ~SPMODE_LOOP, SPMODE_REV | SPMODE_MSTR | SPMODE_EN | SPMODE_LEN(8) | SPMODE_PM(0x8)); out_8(&cp->cp_spim, 0); /* Mask all SPI events */ out_8(&cp->cp_spie, SPI_EMASK); /* Clear all SPI events */ /* start spi transfer */ setbits_8(&cp->cp_spcom, SPI_STR); /* Start transmit */ /* -------------------------------- * Wait for SPI transmit to get out * or time out (1 second = 1000 ms) * -------------------------------- */ for (tm = 0; tm < 1000; ++tm) { if (in_8(&cp->cp_spie) & SPI_TXB) /* Tx Buffer Empty */ break; if ((in_be16(&tbdf->cbd_sc) & BD_SC_READY) == 0) break; udelay(1000); } if (tm >= 1000) printf("*** spi_xfer: Time out while xferring to/from SPI!\n"); /* Clear CS for device */ setbits_be32(&cp->cp_pbdat, 0x0001); return count; } #endif /* CONFIG_SPI */