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Add support for a Freescale non-CPM SPI controller

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This patch adds support for the SPI controller found on Freescale PowerPC
processors such as the MCP834x family.  Additionally, a new config option,
CONFIG_HARD_SPI, is added for general purpose SPI controller use.

Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
This commit is contained in:
Ben Warren 2008-01-16 22:37:35 -05:00 committed by Kim Phillips
parent a8cb43a89b
commit 04a9e1180a
7 changed files with 264 additions and 4 deletions
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2
Makefile
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@ -230,6 +230,7 @@ LIBS += drivers/net/libnet.a
LIBS += drivers/net/sk98lin/libsk98lin.a
LIBS += drivers/pci/libpci.a
LIBS += drivers/pcmcia/libpcmcia.a
LIBS += drivers/spi/libspi.a
ifeq ($(CPU),mpc83xx)
LIBS += drivers/qe/qe.a
endif
@ -377,6 +378,7 @@ TAG_SUBDIRS += drivers/pcmcia
TAG_SUBDIRS += drivers/qe
TAG_SUBDIRS += drivers/rtc
TAG_SUBDIRS += drivers/serial
TAG_SUBDIRS += drivers/spi
TAG_SUBDIRS += drivers/usb
TAG_SUBDIRS += drivers/video

8
README
View File

@ -1377,6 +1377,14 @@ The following options need to be configured:
SPI configuration items (port pins to use, etc). For
an example, see include/configs/sacsng.h.
CONFIG_HARD_SPI
Enables a hardware SPI driver for general-purpose reads
and writes. As with CONFIG_SOFT_SPI, the board configuration
must define a list of chip-select function pointers.
Currently supported on some MPC8xxx processors. For an
example, see include/configs/mpc8349emds.h.
- FPGA Support: CONFIG_FPGA
Enables FPGA subsystem.

46
drivers/spi/Makefile Normal file
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@ -0,0 +1,46 @@
#
# (C) Copyright 2000-2007
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# See file CREDITS for list of people who contributed to this
# project.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of
# the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
include $(TOPDIR)/config.mk
LIB := $(obj)libspi.a
COBJS-y += mpc8xxx_spi.o
COBJS := $(COBJS-y)
SRCS := $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS))
all: $(LIB)
$(LIB): $(obj).depend $(OBJS)
$(AR) $(ARFLAGS) $@ $(OBJS)
#########################################################################
# defines $(obj).depend target
include $(SRCTREE)/rules.mk
sinclude $(obj).depend
#########################################################################

138
drivers/spi/mpc8xxx_spi.c Normal file
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@ -0,0 +1,138 @@
/*
* Copyright (c) 2006 Ben Warren, Qstreams Networks Inc.
* With help from the common/soft_spi and cpu/mpc8260 drivers
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <spi.h>
#include <asm/mpc8xxx_spi.h>
#ifdef CONFIG_HARD_SPI
#define SPI_EV_NE 0x80000000 >> 22 /* Receiver Not Empty */
#define SPI_EV_NF 0x80000000 >> 23 /* Transmitter Not Full */
#define SPI_MODE_LOOP 0x80000000 >> 1 /* Loopback mode */
#define SPI_MODE_REV 0x80000000 >> 5 /* Reverse mode - MSB first */
#define SPI_MODE_MS 0x80000000 >> 6 /* Always master */
#define SPI_MODE_EN 0x80000000 >> 7 /* Enable interface */
#define SPI_PRESCALER(reg, div) (reg)=((reg) & 0xfff0ffff) | ((div)<<16)
#define SPI_CHARLENGTH(reg, div) (reg)=((reg) & 0xff0fffff) | ((div)<<20)
#define SPI_TIMEOUT 1000
void spi_init(void)
{
volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi;
/* ------------------------------------------------
* SPI pins on the MPC83xx are not muxed, so all we do is initialize
* some registers
* ------------------------------------------------ */
spi->mode = SPI_MODE_REV | SPI_MODE_MS | SPI_MODE_EN;
SPI_PRESCALER(spi->mode, 1); /* Use SYSCLK / 8 (16.67MHz typ.) */
spi->event = 0xffffffff; /* Clear all SPI events */
spi->mask = 0x00000000; /* Mask all SPI interrupts */
spi->com = 0; /* LST bit doesn't do anything, so disregard */
}
int spi_xfer(spi_chipsel_type chipsel, int bitlen, uchar * dout, uchar * din)
{
volatile spi8xxx_t *spi = &((immap_t *) (CFG_IMMR))->spi;
unsigned int tmpdout, tmpdin, event;
int numBlks = bitlen / 32 + (bitlen % 32 ? 1 : 0);
int tm, isRead = 0;
unsigned char charSize = 32;
debug("spi_xfer: chipsel %08X dout %08X din %08X bitlen %d\n",
(int)chipsel, *(uint *) dout, *(uint *) din, bitlen);
if (chipsel != NULL)
(*chipsel) (1); /* select the target chip */
spi->event = 0xffffffff; /* Clear all SPI events */
/* handle data in 32-bit chunks */
while (numBlks--) {
tmpdout = 0;
charSize = (bitlen >= 32 ? 32 : bitlen);
/* Shift data so it's msb-justified */
tmpdout = *(u32 *) dout >> (32 - charSize);
/* The LEN field of the SPMODE register is set as follows:
*
* Bit length setting
* l <= 4 3
* 4 < l <= 16 l - 1
* l > 16 0
*/
if (bitlen <= 16)
SPI_CHARLENGTH(spi->mode, bitlen <= 4 ? 3 : bitlen - 1);
else {
SPI_CHARLENGTH(spi->mode, 0);
/* Set up the next iteration if sending > 32 bits */
bitlen -= 32;
dout += 4;
}
spi->tx = tmpdout; /* Write the data out */
debug("*** spi_xfer: ... %08x written\n", tmpdout);
/* --------------------------------
* Wait for SPI transmit to get out
* or time out (1 second = 1000 ms)
* The NE event must be read and cleared first
* -------------------------------- */
for (tm = 0, isRead = 0; tm < SPI_TIMEOUT; ++tm) {
event = spi->event;
if (event & SPI_EV_NE) {
tmpdin = spi->rx;
spi->event |= SPI_EV_NE;
isRead = 1;
*(u32 *) din = (tmpdin << (32 - charSize));
if (charSize == 32) {
/* Advance output buffer by 32 bits */
din += 4;
}
}
/* Only bail when we've had both NE and NF events.
* This will cause timeouts on RO devices, so maybe
* in the future put an arbitrary delay after writing
* the device. Arbitrary delays suck, though... */
if (isRead && (event & SPI_EV_NF))
break;
}
if (tm >= SPI_TIMEOUT)
puts("*** spi_xfer: Time out during SPI transfer");
debug("*** spi_xfer: transfer ended. Value=%08x\n", tmpdin);
}
if (chipsel != NULL)
(*chipsel) (0); /* deselect the target chip */
return 0;
}
#endif /* CONFIG_HARD_SPI */

9
include/asm-ppc/immap_83xx.h
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@ -30,6 +30,7 @@
#include <asm/types.h>
#include <asm/fsl_i2c.h>
#include <asm/mpc8xxx_spi.h>
/*
* Local Access Window
@ -627,7 +628,7 @@ typedef struct immap {
u8 res3[0x900];
lbus83xx_t lbus; /* Local Bus Controller Registers */
u8 res4[0x1000];
spi83xx_t spi; /* Serial Peripheral Interface */
spi8xxx_t spi; /* Serial Peripheral Interface */
dma83xx_t dma; /* DMA */
pciconf83xx_t pci_conf[2]; /* PCI Software Configuration Registers */
ios83xx_t ios; /* Sequencer */
@ -661,7 +662,7 @@ typedef struct immap {
u8 res2[0x900];
lbus83xx_t lbus; /* Local Bus Controller Registers */
u8 res3[0x1000];
spi83xx_t spi; /* Serial Peripheral Interface */
spi8xxx_t spi; /* Serial Peripheral Interface */
dma83xx_t dma; /* DMA */
pciconf83xx_t pci_conf[1]; /* PCI Software Configuration Registers */
u8 res4[0x80];
@ -696,7 +697,7 @@ typedef struct immap {
u8 res2[0x900];
lbus83xx_t lbus; /* Local Bus Controller Registers */
u8 res3[0x1000];
spi83xx_t spi; /* Serial Peripheral Interface */
spi8xxx_t spi; /* Serial Peripheral Interface */
dma83xx_t dma; /* DMA */
pciconf83xx_t pci_conf[1]; /* PCI Software Configuration Registers */
u8 res4[0x80];
@ -741,7 +742,7 @@ typedef struct immap {
u8 res2[0x900];
lbus83xx_t lbus; /* Local Bus Controller Registers */
u8 res3[0x1000];
spi83xx_t spi; /* Serial Peripheral Interface */
spi8xxx_t spi; /* Serial Peripheral Interface */
dma83xx_t dma; /* DMA */
pciconf83xx_t pci_conf[1]; /* PCI Software Configuration Registers */
u8 res4[0x80];

49
include/asm-ppc/mpc8xxx_spi.h Normal file
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@ -0,0 +1,49 @@
/*
* Freescale non-CPM SPI Controller
*
* Copyright 2008 Qstreams Networks, Inc.
*
* This software may be used and distributed according to the
* terms of the GNU Public License, Version 2, incorporated
* herein by reference.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef _ASM_MPC8XXX_SPI_H_
#define _ASM_MPC8XXX_SPI_H_
#include <asm/types.h>
#if defined(CONFIG_MPC834X) || \
defined(CONFIG_MPC8313) || \
defined(CONFIG_MPC8315) || \
defined(CONFIG_MPC837X)
typedef struct spi8xxx
{
u8 res0[0x20]; /* 0x0-0x01f reserved */
u32 mode; /* mode register */
u32 event; /* event register */
u32 mask; /* mask register */
u32 com; /* command register */
u32 tx; /* transmit register */
u32 rx; /* receive register */
u8 res1[0xC8]; /* fill up to 0x100 */
} spi8xxx_t;
#endif
#endif /* _ASM_MPC8XXX_SPI_H_ */

16
lib_ppc/board.c
View File

@ -87,6 +87,9 @@ void doc_init (void);
defined(CONFIG_SOFT_I2C)
#include <i2c.h>
#endif
#if defined(CONFIG_HARD_SPI)
#include <spi.h>
#endif
#if defined(CONFIG_CMD_NAND)
void nand_init (void);
#endif
@ -247,6 +250,16 @@ static int init_func_i2c (void)
}
#endif
#if defined(CONFIG_HARD_SPI)
static int init_func_spi (void)
{
puts ("SPI: ");
spi_init ();
puts ("ready\n");
return (0);
}
#endif
/***********************************************************************/
#if defined(CONFIG_WATCHDOG)
@ -329,6 +342,9 @@ init_fnc_t *init_sequence[] = {
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
init_func_i2c,
#endif
#if defined(CONFIG_HARD_SPI)
init_func_spi,
#endif
#if defined(CONFIG_DTT) /* Digital Thermometers and Thermostats */
dtt_init,
#endif