| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * Copyright (c) 2001 Navin Boppuri / Prashant Patel |
| * <nboppuri@trinetcommunication.com>, |
| * <pmpatel@trinetcommunication.com> |
| * Copyright (c) 2001 Gerd Mennchen <Gerd.Mennchen@icn.siemens.de> |
| * Copyright (c) 2001 Wolfgang Denk, DENX Software Engineering, <wd@denx.de>. |
| */ |
| |
| /* |
| * 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 <common.h> |
| #include <dm.h> |
| #include <mpc8xx.h> |
| #include <spi.h> |
| #include <linux/delay.h> |
| |
| #include <asm/cpm_8xx.h> |
| #include <asm/io.h> |
| |
| #define CPM_SPI_BASE_RX CPM_SPI_BASE |
| #define CPM_SPI_BASE_TX (CPM_SPI_BASE + sizeof(cbd_t)) |
| |
| #define MAX_BUFFER 0x104 |
| |
| static int mpc8xx_spi_probe(struct udevice *dev) |
| { |
| 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); |
| |
| /* 10 + 11 */ |
| out_8(&cp->cp_spim, 0); /* Mask all SPI events */ |
| out_8(&cp->cp_spie, SPI_EMASK); /* Clear all SPI events */ |
| |
| return 0; |
| } |
| |
| static int mpc8xx_spi_xfer(struct udevice *dev, unsigned int bitlen, |
| const void *dout, void *din, unsigned long flags) |
| { |
| immap_t __iomem *immr = (immap_t __iomem *)CONFIG_SYS_IMMR; |
| cpm8xx_t __iomem *cp = &immr->im_cpm; |
| cbd_t __iomem *tbdf, *rbdf; |
| int tm; |
| size_t count = (bitlen + 7) / 8; |
| |
| if (count > MAX_BUFFER) |
| return -EINVAL; |
| |
| 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_be32(&tbdf->cbd_bufaddr, (ulong)dout); |
| 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_be32(&rbdf->cbd_bufaddr, (ulong)din); |
| 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; |
| } |
| |
| static const struct dm_spi_ops mpc8xx_spi_ops = { |
| .xfer = mpc8xx_spi_xfer, |
| }; |
| |
| static const struct udevice_id mpc8xx_spi_ids[] = { |
| { .compatible = "fsl,mpc8xx-spi" }, |
| { } |
| }; |
| |
| U_BOOT_DRIVER(mpc8xx_spi) = { |
| .name = "mpc8xx_spi", |
| .id = UCLASS_SPI, |
| .of_match = mpc8xx_spi_ids, |
| .ops = &mpc8xx_spi_ops, |
| .probe = mpc8xx_spi_probe, |
| }; |