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libubb/: helper library for UBB access
This commit is contained in:
Werner Almesberger
parent
025726e48b
commit
2c52dac4ca
34
libubb/Makefile
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34
libubb/Makefile
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#
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# libubb/Makefile - Build the UBB library
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#
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# Written 2012 by Werner Almesberger
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# Copyright 2012 Werner Almesberger
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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TARGET = mipsel-openwrt-linux-
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CC = $(TARGET)gcc
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CFLAGS = -g -Wall -Iinclude
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LIB = libubb.a
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OBJS = ubb.o
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HDRS = ubb/ubb.h ubb/regbase.h ubb/regs4740.h
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.PHONY: all clean spotless
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all: $(LIB)
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$(LIB): $(OBJS)
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$(AR) cr $@ $^
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clean:
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rm -f $(OBJS)
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spotless: clean
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rm -f $(LIB)
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49
libubb/include/ubb/regbase.h
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49
libubb/include/ubb/regbase.h
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/*
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* include/ubb/regbase.h - Jz4740 minimum register definitions for UBB
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*
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* Written 2011-2012 by Werner Almesberger
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* Copyright 2011-2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef UBB_REGBASE_H
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#define UBB_REGBASE_H
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#include <stdint.h>
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#define UBB_SOC_BASE 0x10000000
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#define UBB_REG_WINDOW 0x4000000
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#define REG(n) (*(volatile uint32_t *) (ubb_mem+(n)))
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#define REG_PADDR(r) ((unsigned long) ((void *) &(r)-ubb_mem+UBB_SOC_BASE))
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extern volatile void *ubb_mem;
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#define _GPIO(n) REG(0x0010000+(n))
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#define PDPIN _GPIO(0x300) /* port D pin level */
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#define PDDAT _GPIO(0x310) /* port D data set */
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#define PDDATS _GPIO(0x314) /* port D data set */
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#define PDDATC _GPIO(0x318) /* port D data clear */
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#define PDPULL _GPIO(0x330) /* port D pull disable */
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#define PDPULLS _GPIO(0x334) /* port D pull disable set */
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#define PDPULLC _GPIO(0x338) /* port D pull disable clear */
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#define PDFUN _GPIO(0x340) /* port D function */
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#define PDFUNS _GPIO(0x344) /* port D function set */
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#define PDFUNC _GPIO(0x348) /* port D function clear */
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#define PDSEL _GPIO(0x350) /* port D select */
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#define PDSELS _GPIO(0x354) /* port D select set */
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#define PDSELC _GPIO(0x358) /* port D select clear */
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#define PDDIR _GPIO(0x360) /* port D direction */
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#define PDDIRS _GPIO(0x364) /* port D direction set */
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#define PDDIRC _GPIO(0x368) /* port D direction clear */
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#endif /* !UBB_REGBASE_H */
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75
libubb/include/ubb/regs4740.h
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75
libubb/include/ubb/regs4740.h
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/*
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* include/ubb/regs4740.h - Jz4740 register definitions (subset)
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*
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* Written 2011-2012 by Werner Almesberger
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* Copyright 2011-2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef UBB_REGS4740_H
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#define UBB_REGS4740_H
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#include <stdint.h>
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#include <ubb/regbase.h>
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#define _CGU(n) REG(0x0000000+(n))
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#define _INTC(n) REG(0x0001000+(n))
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#define _TCU(n) REG(0x0002000+(n))
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#define _MSC(n) REG(0x0021000+(n))
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#define _DMAC(n) REG(0x3020000+(n))
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#define _LCD(n) REG(0x3050000+(n))
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#define CLKGR _CGU(0x0020) /* Clock Gate */
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#define MSCCDR _CGU(0x0068) /* MSC device clock divider */
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#define ICMR _INTC(0x04) /* Interrupt controller mask */
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#define ICMSR _INTC(0x08) /* Interrupt controller mask set */
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#define ICMCR _INTC(0x0c) /* Interrupt controller mask clear */
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#define TSSR _TCU(0x2c) /* Timer STOP set */
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#define TSCR _TCU(0x3c) /* Timer STOP clear */
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#define TESR _TCU(0x14) /* Timer counter enable set */
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#define TECR _TCU(0x18) /* Timer counter enable clear */
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#define TFR _TCU(0x20) /* Timer flag */
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#define TFSR _TCU(0x24) /* Timer flag set */
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#define TFCR _TCU(0x28) /* Timer flag clear */
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#define TCSR(n) _TCU(0x4c+0x10*(n)) /* Timer control */
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#define TDFR(n) _TCU(0x40+0x10*(n)) /* Timer data full */
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#define TDHR(n) _TCU(0x44+0x10*(n)) /* Timer data half */
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#define TCNT(n) _TCU(0x48+0x10*(n)) /* Timer counter */
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#define MSC_STRPCL _MSC(0x00) /* Start/stop MMC/SD clock */
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#define MSC_STAT _MSC(0x04) /* MSC status */
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#define MSC_CLKRT _MSC(0x08) /* MSC clock rate */
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#define MSC_CMDAT _MSC(0x0c) /* MMC/SD command and data control */
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#define MSC_RESTO _MSC(0x10) /* MMC/SD response time out */
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#define MSC_BLKLEN _MSC(0x18) /* MMC/SD block length */
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#define MSC_NOB _MSC(0x1c) /* MMC/SD number of blocks */
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#define MSC_SNOB _MSC(0x20) /* MMC/SD successful blocks */
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#define MSC_IMASK _MSC(0x24) /* MMC/SD interrupt mask */
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#define MSC_IREG _MSC(0x28) /* MMC/SD interrupt */
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#define MSC_CMD _MSC(0x2c) /* MMC/SD command index */
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#define MSC_ARG _MSC(0x30) /* MMC/SD command argument */
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#define MSC_RXFIFO _MSC(0x38) /* MMC/SD receive data FIFO */
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#define MSC_TXFIFO _MSC(0x3c) /* MMC/SD transmit data FIFO */
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#define _DMAn(n, r) _DMAC(0x20*(n)+(r))
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#define DSA(n) _DMAn(n, 0x00) /* DMA source address */
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#define DTA(n) _DMAn(n, 0x04) /* DMA target address */
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#define DTC(n) _DMAn(n, 0x08) /* DMA transfer count */
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#define DRT(n) _DMAn(n, 0x0c) /* DMA request type */
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#define DCS(n) _DMAn(n, 0x10) /* DMA channel control/status */
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#define DCM(n) _DMAn(n, 0x14) /* DMA command */
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#define DMAC _DMAC(0x300) /* DMA control */
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#define DDR _DMAC(0x308) /* DMA doorbell */
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#define LCDCTRL _LCD(0x30) /* LCD control */
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#endif /* !UBB_REGS4740_H */
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44
libubb/include/ubb/ubb.h
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44
libubb/include/ubb/ubb.h
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/*
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* include/ubb/ubb.h - Access functions for the Universal Breakout Board
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef UBB_UBB_H
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#define UBB_UBB_H
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#include <stdint.h>
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#include <ubb/regbase.h>
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#define UBB_nPWR (1 << 2) /* PD02 */
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#define UBB_DAT2 (1 << 12) /* PD12 */
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#define UBB_DAT3 (1 << 13) /* PD13 */
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#define UBB_CMD (1 << 8) /* PD08 */
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#define UBB_CLK (1 << 9) /* PD09 */
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#define UBB_DAT0 (1 << 10) /* PD10 */
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#define UBB_DAT1 (1 << 11) /* PD11 */
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#define UBB_ALL_IO (UBB_DAT2 | UBB_DAT3 | UBB_CMD | UBB_CLK | UBB_DAT0 | \
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UBB_DAT1)
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#define UBB_ALL (UBB_nPWR | UBB_ALL_IO)
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#define SET(mask) PDDATS = (mask)
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#define CLR(mask) PDDATC = (mask)
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#define OUT(mask) PDDIRS = (mask)
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#define IN(mask) PDDIRC = (mask)
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#define PIN(mask) (!!(PDPIN & (mask)))
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int ubb_open(uint32_t keep);
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void ubb_power(int on);
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void ubb_close(uint32_t keep);
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#endif /* !UBB_UBB_H */
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93
libubb/ubb.c
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93
libubb/ubb.c
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/*
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* libubb/ubb.c - Open/close UBB
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <ubb/ubb.h>
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volatile void *ubb_mem;
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static int ubb_fd;
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static uint32_t data, dir, pull, func, sel;
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static void *map(off_t addr, size_t size, int *fd)
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{
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void *mem;
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*fd = open("/dev/mem", O_RDWR | O_SYNC);
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if (*fd < 0)
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return NULL;
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mem = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, *fd, addr);
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if (mem == MAP_FAILED) {
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(void) close(*fd);
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return NULL;
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}
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return mem;
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}
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int ubb_open(uint32_t keep)
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{
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ubb_mem = map(UBB_SOC_BASE, UBB_REG_WINDOW, &ubb_fd);
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if (!ubb_mem)
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return -1;
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data = PDDAT & UBB_ALL;
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dir = PDDIR & UBB_ALL;
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pull = PDPULL & UBB_ALL;
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func = PDFUN & UBB_ALL;
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sel = PDSEL & UBB_ALL;
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/* enable pull-ups to let card ramp up power */
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PDPULLC = UBB_ALL_IO & ~keep;
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PDDIRC = UBB_ALL_IO & ~keep;
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PDFUNC = UBB_ALL & ~keep;
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PDSELC = UBB_ALL & ~keep;
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PDDATS = UBB_nPWR & ~keep;
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PDDIRS = UBB_nPWR & ~keep;
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return 0;
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}
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void ubb_power(int on)
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{
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if (on) {
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usleep(10*1000);
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PDDATC = UBB_nPWR;
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} else {
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PDDATS = UBB_nPWR;
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}
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}
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void ubb_close(uint32_t keep)
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{
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PDSELS = sel & ~keep;
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PDFUNS = func & ~keep;
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PDDATS = (data | UBB_nPWR) & ~keep;
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PDDIRS = (dir | UBB_nPWR) & ~keep;
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PDPULLS = pull & ~keep;
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close(ubb_fd);
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}
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