mirror of https://gitee.com/openkylin/linux.git
net/can: add driver for mscan family & mpc52xx_mscan
Taken from socketcan-svn, fixed remaining todos, cleaned up, tested with a phyCORE-MPC5200B-IO and a custom board. Signed-off-by: Wolfram Sang <w.sang@pengutronix.de> Cc: Wolfgang Grandegger <wg@grandegger.com> Cc: Grant Likely <grant.likely@secretlab.ca> Cc: David Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfram Sang
David S. Miller
parent
888801357f
commit
afa17a500a
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@ -178,3 +178,12 @@ External interrupts:
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external irq3: interrupts = <1 3 n>;
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external irq3: interrupts = <1 3 n>;
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'n' is sense (0: level high, 1: edge rising, 2: edge falling 3: level low)
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'n' is sense (0: level high, 1: edge rising, 2: edge falling 3: level low)
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fsl,mpc5200-mscan nodes
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-----------------------
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In addition to the required compatible-, reg- and interrupt-properites, you can
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also specify which clock shall be used for the bus:
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- fsl,mscan-clk-src - a string describing the clock source. Valid values
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are "ip" for IP_CLK and "sys" for SYS_XTAL.
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"sys" is the default in case the property is not
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present.
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@ -108,6 +108,25 @@ config CAN_MCP251X
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---help---
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---help---
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Driver for the Microchip MCP251x SPI CAN controllers.
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Driver for the Microchip MCP251x SPI CAN controllers.
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config CAN_MSCAN
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depends on CAN_DEV && (PPC || M68K || M68KNOMMU)
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tristate "Support for Freescale MSCAN based chips"
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---help---
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The Motorola Scalable Controller Area Network (MSCAN) definition
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is based on the MSCAN12 definition which is the specific
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implementation of the Motorola Scalable CAN concept targeted for
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the Motorola MC68HC12 Microcontroller Family.
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config CAN_MPC52XX
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tristate "Freescale MPC5xxx onboard CAN controller"
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depends on CAN_MSCAN && PPC_MPC52xx
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---help---
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If you say yes here you get support for Freescale's MPC52xx
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onboard dualCAN controller.
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This driver can also be built as a module. If so, the module
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will be called mpc5xxx_can.
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config CAN_DEBUG_DEVICES
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config CAN_DEBUG_DEVICES
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bool "CAN devices debugging messages"
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bool "CAN devices debugging messages"
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depends on CAN
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depends on CAN
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@ -10,6 +10,7 @@ can-dev-y := dev.o
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obj-y += usb/
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obj-y += usb/
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obj-$(CONFIG_CAN_SJA1000) += sja1000/
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obj-$(CONFIG_CAN_SJA1000) += sja1000/
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obj-$(CONFIG_CAN_MSCAN) += mscan/
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obj-$(CONFIG_CAN_AT91) += at91_can.o
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obj-$(CONFIG_CAN_AT91) += at91_can.o
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obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o
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obj-$(CONFIG_CAN_TI_HECC) += ti_hecc.o
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obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
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obj-$(CONFIG_CAN_MCP251X) += mcp251x.o
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@ -0,0 +1,5 @@
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obj-$(CONFIG_CAN_MPC52XX) += mscan-mpc52xx.o
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mscan-mpc52xx-objs := mscan.o mpc52xx_can.o
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ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG
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@ -0,0 +1,279 @@
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/*
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* CAN bus driver for the Freescale MPC5xxx embedded CPU.
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*
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* Copyright (C) 2004-2005 Andrey Volkov <avolkov@varma-el.com>,
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* Varma Electronics Oy
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* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
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* Copyright (C) 2009 Wolfram Sang, Pengutronix <w.sang@pengutronix.de>
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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 version 2 of the GNU General Public License
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* as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/netdevice.h>
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#include <linux/can.h>
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#include <linux/can/dev.h>
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#include <linux/of_platform.h>
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#include <sysdev/fsl_soc.h>
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#include <linux/io.h>
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#include <asm/mpc52xx.h>
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#include "mscan.h"
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#define DRV_NAME "mpc5xxx_can"
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static struct of_device_id mpc52xx_cdm_ids[] __devinitdata = {
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{ .compatible = "fsl,mpc5200-cdm", },
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{ .compatible = "fsl,mpc5200b-cdm", },
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{}
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};
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/*
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* Get the frequency of the external oscillator clock connected
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* to the SYS_XTAL_IN pin, or return 0 if it cannot be determined.
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*/
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static unsigned int __devinit mpc52xx_can_xtal_freq(struct of_device *of)
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{
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struct mpc52xx_cdm __iomem *cdm;
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struct device_node *np_cdm;
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unsigned int freq;
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u32 val;
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freq = mpc5xxx_get_bus_frequency(of->node);
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if (!freq)
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return 0;
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/*
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* Determine SYS_XTAL_IN frequency from the clock domain settings
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*/
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np_cdm = of_find_matching_node(NULL, mpc52xx_cdm_ids);
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if (!np_cdm) {
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dev_err(&of->dev, "can't get clock node!\n");
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return 0;
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}
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cdm = of_iomap(np_cdm, 0);
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of_node_put(np_cdm);
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if (in_8(&cdm->ipb_clk_sel) & 0x1)
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freq *= 2;
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val = in_be32(&cdm->rstcfg);
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if (val & (1 << 5))
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freq *= 8;
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else
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freq *= 4;
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if (val & (1 << 6))
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freq /= 12;
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else
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freq /= 16;
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iounmap(cdm);
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return freq;
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}
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/*
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* Get frequency of the MSCAN clock source
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*
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* Either the oscillator clock (SYS_XTAL_IN) or the IP bus clock (IP_CLK)
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* can be selected. According to the MPC5200 user's manual, the oscillator
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* clock is the better choice as it has less jitter but due to a hardware
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* bug, it can not be selected for the old MPC5200 Rev. A chips.
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*/
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static unsigned int __devinit mpc52xx_can_clock_freq(struct of_device *of,
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int clock_src)
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{
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unsigned int pvr;
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pvr = mfspr(SPRN_PVR);
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if (clock_src == MSCAN_CLKSRC_BUS || pvr == 0x80822011)
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return mpc5xxx_get_bus_frequency(of->node);
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return mpc52xx_can_xtal_freq(of);
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}
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static int __devinit mpc5xxx_can_probe(struct of_device *ofdev,
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const struct of_device_id *id)
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{
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struct device_node *np = ofdev->node;
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struct net_device *dev;
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struct mscan_priv *priv;
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void __iomem *base;
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const char *clk_src;
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int err, irq, clock_src;
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base = of_iomap(ofdev->node, 0);
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if (!base) {
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dev_err(&ofdev->dev, "couldn't ioremap\n");
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err = -ENOMEM;
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goto exit_release_mem;
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}
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irq = irq_of_parse_and_map(np, 0);
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if (!irq) {
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dev_err(&ofdev->dev, "no irq found\n");
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err = -ENODEV;
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goto exit_unmap_mem;
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}
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dev = alloc_mscandev();
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if (!dev) {
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err = -ENOMEM;
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goto exit_dispose_irq;
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}
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priv = netdev_priv(dev);
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priv->reg_base = base;
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dev->irq = irq;
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/*
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* Either the oscillator clock (SYS_XTAL_IN) or the IP bus clock
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* (IP_CLK) can be selected as MSCAN clock source. According to
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* the MPC5200 user's manual, the oscillator clock is the better
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* choice as it has less jitter. For this reason, it is selected
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* by default.
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*/
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clk_src = of_get_property(np, "fsl,mscan-clk-src", NULL);
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if (clk_src && strcmp(clk_src, "ip") == 0)
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clock_src = MSCAN_CLKSRC_BUS;
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else
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clock_src = MSCAN_CLKSRC_XTAL;
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priv->can.clock.freq = mpc52xx_can_clock_freq(ofdev, clock_src);
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if (!priv->can.clock.freq) {
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dev_err(&ofdev->dev, "couldn't get MSCAN clock frequency\n");
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err = -ENODEV;
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goto exit_free_mscan;
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}
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SET_NETDEV_DEV(dev, &ofdev->dev);
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err = register_mscandev(dev, clock_src);
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if (err) {
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dev_err(&ofdev->dev, "registering %s failed (err=%d)\n",
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DRV_NAME, err);
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goto exit_free_mscan;
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}
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dev_set_drvdata(&ofdev->dev, dev);
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dev_info(&ofdev->dev, "MSCAN at 0x%p, irq %d, clock %d Hz\n",
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priv->reg_base, dev->irq, priv->can.clock.freq);
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return 0;
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exit_free_mscan:
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free_candev(dev);
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exit_dispose_irq:
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irq_dispose_mapping(irq);
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exit_unmap_mem:
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iounmap(base);
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exit_release_mem:
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return err;
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}
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static int __devexit mpc5xxx_can_remove(struct of_device *ofdev)
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{
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struct net_device *dev = dev_get_drvdata(&ofdev->dev);
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struct mscan_priv *priv = netdev_priv(dev);
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dev_set_drvdata(&ofdev->dev, NULL);
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unregister_mscandev(dev);
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iounmap(priv->reg_base);
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irq_dispose_mapping(dev->irq);
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free_candev(dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static struct mscan_regs saved_regs;
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static int mpc5xxx_can_suspend(struct of_device *ofdev, pm_message_t state)
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{
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struct net_device *dev = dev_get_drvdata(&ofdev->dev);
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struct mscan_priv *priv = netdev_priv(dev);
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struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
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_memcpy_fromio(&saved_regs, regs, sizeof(*regs));
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return 0;
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}
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static int mpc5xxx_can_resume(struct of_device *ofdev)
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{
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struct net_device *dev = dev_get_drvdata(&ofdev->dev);
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struct mscan_priv *priv = netdev_priv(dev);
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struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
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regs->canctl0 |= MSCAN_INITRQ;
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while ((regs->canctl1 & MSCAN_INITAK) == 0)
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udelay(10);
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regs->canctl1 = saved_regs.canctl1;
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regs->canbtr0 = saved_regs.canbtr0;
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regs->canbtr1 = saved_regs.canbtr1;
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regs->canidac = saved_regs.canidac;
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/* restore masks, buffers etc. */
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_memcpy_toio(®s->canidar1_0, (void *)&saved_regs.canidar1_0,
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sizeof(*regs) - offsetof(struct mscan_regs, canidar1_0));
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regs->canctl0 &= ~MSCAN_INITRQ;
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regs->cantbsel = saved_regs.cantbsel;
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|
regs->canrier = saved_regs.canrier;
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regs->cantier = saved_regs.cantier;
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regs->canctl0 = saved_regs.canctl0;
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|
|
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|
return 0;
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}
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#endif
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|
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static struct of_device_id __devinitdata mpc5xxx_can_table[] = {
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{.compatible = "fsl,mpc5200-mscan"},
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{.compatible = "fsl,mpc5200b-mscan"},
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{},
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};
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static struct of_platform_driver mpc5xxx_can_driver = {
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.owner = THIS_MODULE,
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|
.name = "mpc5xxx_can",
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|
.probe = mpc5xxx_can_probe,
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|
.remove = __devexit_p(mpc5xxx_can_remove),
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#ifdef CONFIG_PM
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.suspend = mpc5xxx_can_suspend,
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.resume = mpc5xxx_can_resume,
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#endif
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|
.match_table = mpc5xxx_can_table,
|
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|
};
|
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|
|
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|
static int __init mpc5xxx_can_init(void)
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|
{
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|
return of_register_platform_driver(&mpc5xxx_can_driver);
|
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|
}
|
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module_init(mpc5xxx_can_init);
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|
|
||||||
|
static void __exit mpc5xxx_can_exit(void)
|
||||||
|
{
|
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|
return of_unregister_platform_driver(&mpc5xxx_can_driver);
|
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|
};
|
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|
module_exit(mpc5xxx_can_exit);
|
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|
|
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MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
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MODULE_DESCRIPTION("Freescale MPC5200 CAN driver");
|
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|
MODULE_LICENSE("GPL v2");
|
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|
|
@ -0,0 +1,699 @@
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|
/*
|
||||||
|
* CAN bus driver for the alone generic (as possible as) MSCAN controller.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>,
|
||||||
|
* Varma Electronics Oy
|
||||||
|
* Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
|
||||||
|
* Copytight (C) 2008-2009 Pengutronix <kernel@pengutronix.de>
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the version 2 of the GNU General Public License
|
||||||
|
* 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
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <linux/kernel.h>
|
||||||
|
#include <linux/module.h>
|
||||||
|
#include <linux/interrupt.h>
|
||||||
|
#include <linux/delay.h>
|
||||||
|
#include <linux/netdevice.h>
|
||||||
|
#include <linux/if_arp.h>
|
||||||
|
#include <linux/if_ether.h>
|
||||||
|
#include <linux/list.h>
|
||||||
|
#include <linux/can.h>
|
||||||
|
#include <linux/can/dev.h>
|
||||||
|
#include <linux/can/error.h>
|
||||||
|
#include <linux/io.h>
|
||||||
|
|
||||||
|
#include "mscan.h"
|
||||||
|
|
||||||
|
#define MSCAN_NORMAL_MODE 0
|
||||||
|
#define MSCAN_SLEEP_MODE MSCAN_SLPRQ
|
||||||
|
#define MSCAN_INIT_MODE (MSCAN_INITRQ | MSCAN_SLPRQ)
|
||||||
|
#define MSCAN_POWEROFF_MODE (MSCAN_CSWAI | MSCAN_SLPRQ)
|
||||||
|
#define MSCAN_SET_MODE_RETRIES 255
|
||||||
|
#define MSCAN_ECHO_SKB_MAX 3
|
||||||
|
|
||||||
|
#define BTR0_BRP_MASK 0x3f
|
||||||
|
#define BTR0_SJW_SHIFT 6
|
||||||
|
#define BTR0_SJW_MASK (0x3 << BTR0_SJW_SHIFT)
|
||||||
|
|
||||||
|
#define BTR1_TSEG1_MASK 0xf
|
||||||
|
#define BTR1_TSEG2_SHIFT 4
|
||||||
|
#define BTR1_TSEG2_MASK (0x7 << BTR1_TSEG2_SHIFT)
|
||||||
|
#define BTR1_SAM_SHIFT 7
|
||||||
|
|
||||||
|
#define BTR0_SET_BRP(brp) (((brp) - 1) & BTR0_BRP_MASK)
|
||||||
|
#define BTR0_SET_SJW(sjw) ((((sjw) - 1) << BTR0_SJW_SHIFT) & \
|
||||||
|
BTR0_SJW_MASK)
|
||||||
|
|
||||||
|
#define BTR1_SET_TSEG1(tseg1) (((tseg1) - 1) & BTR1_TSEG1_MASK)
|
||||||
|
#define BTR1_SET_TSEG2(tseg2) ((((tseg2) - 1) << BTR1_TSEG2_SHIFT) & \
|
||||||
|
BTR1_TSEG2_MASK)
|
||||||
|
#define BTR1_SET_SAM(sam) ((sam) ? 1 << BTR1_SAM_SHIFT : 0)
|
||||||
|
|
||||||
|
static struct can_bittiming_const mscan_bittiming_const = {
|
||||||
|
.name = "mscan",
|
||||||
|
.tseg1_min = 4,
|
||||||
|
.tseg1_max = 16,
|
||||||
|
.tseg2_min = 2,
|
||||||
|
.tseg2_max = 8,
|
||||||
|
.sjw_max = 4,
|
||||||
|
.brp_min = 1,
|
||||||
|
.brp_max = 64,
|
||||||
|
.brp_inc = 1,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct mscan_state {
|
||||||
|
u8 mode;
|
||||||
|
u8 canrier;
|
||||||
|
u8 cantier;
|
||||||
|
};
|
||||||
|
|
||||||
|
#define F_RX_PROGRESS 0
|
||||||
|
#define F_TX_PROGRESS 1
|
||||||
|
#define F_TX_WAIT_ALL 2
|
||||||
|
|
||||||
|
static enum can_state state_map[] = {
|
||||||
|
CAN_STATE_ERROR_ACTIVE,
|
||||||
|
CAN_STATE_ERROR_WARNING,
|
||||||
|
CAN_STATE_ERROR_PASSIVE,
|
||||||
|
CAN_STATE_BUS_OFF
|
||||||
|
};
|
||||||
|
|
||||||
|
static int mscan_set_mode(struct net_device *dev, u8 mode)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
int ret = 0;
|
||||||
|
int i;
|
||||||
|
u8 canctl1;
|
||||||
|
|
||||||
|
if (mode != MSCAN_NORMAL_MODE) {
|
||||||
|
|
||||||
|
if (priv->tx_active) {
|
||||||
|
/* Abort transfers before going to sleep */#
|
||||||
|
out_8(®s->cantarq, priv->tx_active);
|
||||||
|
/* Suppress TX done interrupts */
|
||||||
|
out_8(®s->cantier, 0);
|
||||||
|
}
|
||||||
|
|
||||||
|
canctl1 = in_8(®s->canctl1);
|
||||||
|
if ((mode & MSCAN_SLPRQ) && (canctl1 & MSCAN_SLPAK) == 0) {
|
||||||
|
out_8(®s->canctl0,
|
||||||
|
in_8(®s->canctl0) | MSCAN_SLPRQ);
|
||||||
|
for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) {
|
||||||
|
if (in_8(®s->canctl1) & MSCAN_SLPAK)
|
||||||
|
break;
|
||||||
|
udelay(100);
|
||||||
|
}
|
||||||
|
/*
|
||||||
|
* The mscan controller will fail to enter sleep mode,
|
||||||
|
* while there are irregular activities on bus, like
|
||||||
|
* somebody keeps retransmitting. This behavior is
|
||||||
|
* undocumented and seems to differ between mscan built
|
||||||
|
* in mpc5200b and mpc5200. We proceed in that case,
|
||||||
|
* since otherwise the slprq will be kept set and the
|
||||||
|
* controller will get stuck. NOTE: INITRQ or CSWAI
|
||||||
|
* will abort all active transmit actions, if still
|
||||||
|
* any, at once.
|
||||||
|
*/
|
||||||
|
if (i >= MSCAN_SET_MODE_RETRIES)
|
||||||
|
dev_dbg(dev->dev.parent,
|
||||||
|
"device failed to enter sleep mode. "
|
||||||
|
"We proceed anyhow.\n");
|
||||||
|
else
|
||||||
|
priv->can.state = CAN_STATE_SLEEPING;
|
||||||
|
}
|
||||||
|
|
||||||
|
if ((mode & MSCAN_INITRQ) && (canctl1 & MSCAN_INITAK) == 0) {
|
||||||
|
out_8(®s->canctl0,
|
||||||
|
in_8(®s->canctl0) | MSCAN_INITRQ);
|
||||||
|
for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) {
|
||||||
|
if (in_8(®s->canctl1) & MSCAN_INITAK)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (i >= MSCAN_SET_MODE_RETRIES)
|
||||||
|
ret = -ENODEV;
|
||||||
|
}
|
||||||
|
if (!ret)
|
||||||
|
priv->can.state = CAN_STATE_STOPPED;
|
||||||
|
|
||||||
|
if (mode & MSCAN_CSWAI)
|
||||||
|
out_8(®s->canctl0,
|
||||||
|
in_8(®s->canctl0) | MSCAN_CSWAI);
|
||||||
|
|
||||||
|
} else {
|
||||||
|
canctl1 = in_8(®s->canctl1);
|
||||||
|
if (canctl1 & (MSCAN_SLPAK | MSCAN_INITAK)) {
|
||||||
|
out_8(®s->canctl0, in_8(®s->canctl0) &
|
||||||
|
~(MSCAN_SLPRQ | MSCAN_INITRQ));
|
||||||
|
for (i = 0; i < MSCAN_SET_MODE_RETRIES; i++) {
|
||||||
|
canctl1 = in_8(®s->canctl1);
|
||||||
|
if (!(canctl1 & (MSCAN_INITAK | MSCAN_SLPAK)))
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
if (i >= MSCAN_SET_MODE_RETRIES)
|
||||||
|
ret = -ENODEV;
|
||||||
|
else
|
||||||
|
priv->can.state = CAN_STATE_ERROR_ACTIVE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_start(struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
u8 canrflg;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
out_8(®s->canrier, 0);
|
||||||
|
|
||||||
|
INIT_LIST_HEAD(&priv->tx_head);
|
||||||
|
priv->prev_buf_id = 0;
|
||||||
|
priv->cur_pri = 0;
|
||||||
|
priv->tx_active = 0;
|
||||||
|
priv->shadow_canrier = 0;
|
||||||
|
priv->flags = 0;
|
||||||
|
|
||||||
|
err = mscan_set_mode(dev, MSCAN_NORMAL_MODE);
|
||||||
|
if (err)
|
||||||
|
return err;
|
||||||
|
|
||||||
|
canrflg = in_8(®s->canrflg);
|
||||||
|
priv->shadow_statflg = canrflg & MSCAN_STAT_MSK;
|
||||||
|
priv->can.state = state_map[max(MSCAN_STATE_RX(canrflg),
|
||||||
|
MSCAN_STATE_TX(canrflg))];
|
||||||
|
out_8(®s->cantier, 0);
|
||||||
|
|
||||||
|
/* Enable receive interrupts. */
|
||||||
|
out_8(®s->canrier, MSCAN_OVRIE | MSCAN_RXFIE | MSCAN_CSCIE |
|
||||||
|
MSCAN_RSTATE1 | MSCAN_RSTATE0 | MSCAN_TSTATE1 | MSCAN_TSTATE0);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct can_frame *frame = (struct can_frame *)skb->data;
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
int i, rtr, buf_id;
|
||||||
|
u32 can_id;
|
||||||
|
|
||||||
|
if (frame->can_dlc > 8)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
out_8(®s->cantier, 0);
|
||||||
|
|
||||||
|
i = ~priv->tx_active & MSCAN_TXE;
|
||||||
|
buf_id = ffs(i) - 1;
|
||||||
|
switch (hweight8(i)) {
|
||||||
|
case 0:
|
||||||
|
netif_stop_queue(dev);
|
||||||
|
dev_err(dev->dev.parent, "Tx Ring full when queue awake!\n");
|
||||||
|
return NETDEV_TX_BUSY;
|
||||||
|
case 1:
|
||||||
|
/*
|
||||||
|
* if buf_id < 3, then current frame will be send out of order,
|
||||||
|
* since buffer with lower id have higher priority (hell..)
|
||||||
|
*/
|
||||||
|
netif_stop_queue(dev);
|
||||||
|
case 2:
|
||||||
|
if (buf_id < priv->prev_buf_id) {
|
||||||
|
priv->cur_pri++;
|
||||||
|
if (priv->cur_pri == 0xff) {
|
||||||
|
set_bit(F_TX_WAIT_ALL, &priv->flags);
|
||||||
|
netif_stop_queue(dev);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
set_bit(F_TX_PROGRESS, &priv->flags);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
priv->prev_buf_id = buf_id;
|
||||||
|
out_8(®s->cantbsel, i);
|
||||||
|
|
||||||
|
rtr = frame->can_id & CAN_RTR_FLAG;
|
||||||
|
|
||||||
|
if (frame->can_id & CAN_EFF_FLAG) {
|
||||||
|
can_id = (frame->can_id & CAN_EFF_MASK) << 1;
|
||||||
|
if (rtr)
|
||||||
|
can_id |= 1;
|
||||||
|
out_be16(®s->tx.idr3_2, can_id);
|
||||||
|
|
||||||
|
can_id >>= 16;
|
||||||
|
can_id = (can_id & 0x7) | ((can_id << 2) & 0xffe0) | (3 << 3);
|
||||||
|
} else {
|
||||||
|
can_id = (frame->can_id & CAN_SFF_MASK) << 5;
|
||||||
|
if (rtr)
|
||||||
|
can_id |= 1 << 4;
|
||||||
|
}
|
||||||
|
out_be16(®s->tx.idr1_0, can_id);
|
||||||
|
|
||||||
|
if (!rtr) {
|
||||||
|
void __iomem *data = ®s->tx.dsr1_0;
|
||||||
|
u16 *payload = (u16 *) frame->data;
|
||||||
|
/* It is safe to write into dsr[dlc+1] */
|
||||||
|
for (i = 0; i < (frame->can_dlc + 1) / 2; i++) {
|
||||||
|
out_be16(data, *payload++);
|
||||||
|
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
out_8(®s->tx.dlr, frame->can_dlc);
|
||||||
|
out_8(®s->tx.tbpr, priv->cur_pri);
|
||||||
|
|
||||||
|
/* Start transmission. */
|
||||||
|
out_8(®s->cantflg, 1 << buf_id);
|
||||||
|
|
||||||
|
if (!test_bit(F_TX_PROGRESS, &priv->flags))
|
||||||
|
dev->trans_start = jiffies;
|
||||||
|
|
||||||
|
list_add_tail(&priv->tx_queue[buf_id].list, &priv->tx_head);
|
||||||
|
|
||||||
|
can_put_echo_skb(skb, dev, buf_id);
|
||||||
|
|
||||||
|
/* Enable interrupt. */
|
||||||
|
priv->tx_active |= 1 << buf_id;
|
||||||
|
out_8(®s->cantier, priv->tx_active);
|
||||||
|
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* This function returns the old state to see where we came from */
|
||||||
|
static enum can_state check_set_state(struct net_device *dev, u8 canrflg)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
enum can_state state, old_state = priv->can.state;
|
||||||
|
|
||||||
|
if (canrflg & MSCAN_CSCIF && old_state <= CAN_STATE_BUS_OFF) {
|
||||||
|
state = state_map[max(MSCAN_STATE_RX(canrflg),
|
||||||
|
MSCAN_STATE_TX(canrflg))];
|
||||||
|
priv->can.state = state;
|
||||||
|
}
|
||||||
|
return old_state;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
u32 can_id;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
can_id = in_be16(®s->rx.idr1_0);
|
||||||
|
if (can_id & (1 << 3)) {
|
||||||
|
frame->can_id = CAN_EFF_FLAG;
|
||||||
|
can_id = ((can_id << 16) | in_be16(®s->rx.idr3_2));
|
||||||
|
can_id = ((can_id & 0xffe00000) |
|
||||||
|
((can_id & 0x7ffff) << 2)) >> 2;
|
||||||
|
} else {
|
||||||
|
can_id >>= 4;
|
||||||
|
frame->can_id = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
frame->can_id |= can_id >> 1;
|
||||||
|
if (can_id & 1)
|
||||||
|
frame->can_id |= CAN_RTR_FLAG;
|
||||||
|
frame->can_dlc = in_8(®s->rx.dlr) & 0xf;
|
||||||
|
|
||||||
|
if (!(frame->can_id & CAN_RTR_FLAG)) {
|
||||||
|
void __iomem *data = ®s->rx.dsr1_0;
|
||||||
|
u16 *payload = (u16 *) frame->data;
|
||||||
|
for (i = 0; i < (frame->can_dlc + 1) / 2; i++) {
|
||||||
|
*payload++ = in_be16(data);
|
||||||
|
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
out_8(®s->canrflg, MSCAN_RXF);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void mscan_get_err_frame(struct net_device *dev, struct can_frame *frame,
|
||||||
|
u8 canrflg)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
struct net_device_stats *stats = &dev->stats;
|
||||||
|
enum can_state old_state;
|
||||||
|
|
||||||
|
dev_dbg(dev->dev.parent, "error interrupt (canrflg=%#x)\n", canrflg);
|
||||||
|
frame->can_id = CAN_ERR_FLAG;
|
||||||
|
|
||||||
|
if (canrflg & MSCAN_OVRIF) {
|
||||||
|
frame->can_id |= CAN_ERR_CRTL;
|
||||||
|
frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
|
||||||
|
stats->rx_over_errors++;
|
||||||
|
stats->rx_errors++;
|
||||||
|
} else
|
||||||
|
frame->data[1] = 0;
|
||||||
|
|
||||||
|
old_state = check_set_state(dev, canrflg);
|
||||||
|
/* State changed */
|
||||||
|
if (old_state != priv->can.state) {
|
||||||
|
switch (priv->can.state) {
|
||||||
|
case CAN_STATE_ERROR_WARNING:
|
||||||
|
frame->can_id |= CAN_ERR_CRTL;
|
||||||
|
priv->can.can_stats.error_warning++;
|
||||||
|
if ((priv->shadow_statflg & MSCAN_RSTAT_MSK) <
|
||||||
|
(canrflg & MSCAN_RSTAT_MSK))
|
||||||
|
frame->data[1] |= CAN_ERR_CRTL_RX_WARNING;
|
||||||
|
|
||||||
|
if ((priv->shadow_statflg & MSCAN_TSTAT_MSK) <
|
||||||
|
(canrflg & MSCAN_TSTAT_MSK))
|
||||||
|
frame->data[1] |= CAN_ERR_CRTL_TX_WARNING;
|
||||||
|
break;
|
||||||
|
case CAN_STATE_ERROR_PASSIVE:
|
||||||
|
frame->can_id |= CAN_ERR_CRTL;
|
||||||
|
priv->can.can_stats.error_passive++;
|
||||||
|
frame->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
|
||||||
|
break;
|
||||||
|
case CAN_STATE_BUS_OFF:
|
||||||
|
frame->can_id |= CAN_ERR_BUSOFF;
|
||||||
|
/*
|
||||||
|
* The MSCAN on the MPC5200 does recover from bus-off
|
||||||
|
* automatically. To avoid that we stop the chip doing
|
||||||
|
* a light-weight stop (we are in irq-context).
|
||||||
|
*/
|
||||||
|
out_8(®s->cantier, 0);
|
||||||
|
out_8(®s->canrier, 0);
|
||||||
|
out_8(®s->canctl0, in_8(®s->canctl0) |
|
||||||
|
MSCAN_SLPRQ | MSCAN_INITRQ);
|
||||||
|
can_bus_off(dev);
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
priv->shadow_statflg = canrflg & MSCAN_STAT_MSK;
|
||||||
|
frame->can_dlc = CAN_ERR_DLC;
|
||||||
|
out_8(®s->canrflg, MSCAN_ERR_IF);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_rx_poll(struct napi_struct *napi, int quota)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = container_of(napi, struct mscan_priv, napi);
|
||||||
|
struct net_device *dev = napi->dev;
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
struct net_device_stats *stats = &dev->stats;
|
||||||
|
int npackets = 0;
|
||||||
|
int ret = 1;
|
||||||
|
struct sk_buff *skb;
|
||||||
|
struct can_frame *frame;
|
||||||
|
u8 canrflg;
|
||||||
|
|
||||||
|
while (npackets < quota && ((canrflg = in_8(®s->canrflg)) &
|
||||||
|
(MSCAN_RXF | MSCAN_ERR_IF))) {
|
||||||
|
|
||||||
|
skb = alloc_can_skb(dev, &frame);
|
||||||
|
if (!skb) {
|
||||||
|
if (printk_ratelimit())
|
||||||
|
dev_notice(dev->dev.parent, "packet dropped\n");
|
||||||
|
stats->rx_dropped++;
|
||||||
|
out_8(®s->canrflg, canrflg);
|
||||||
|
continue;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (canrflg & MSCAN_RXF)
|
||||||
|
mscan_get_rx_frame(dev, frame);
|
||||||
|
else if (canrflg & MSCAN_ERR_IF)
|
||||||
|
mscan_get_err_frame(dev, frame, canrflg);
|
||||||
|
|
||||||
|
stats->rx_packets++;
|
||||||
|
stats->rx_bytes += frame->can_dlc;
|
||||||
|
npackets++;
|
||||||
|
netif_receive_skb(skb);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!(in_8(®s->canrflg) & (MSCAN_RXF | MSCAN_ERR_IF))) {
|
||||||
|
napi_complete(&priv->napi);
|
||||||
|
clear_bit(F_RX_PROGRESS, &priv->flags);
|
||||||
|
if (priv->can.state < CAN_STATE_BUS_OFF)
|
||||||
|
out_8(®s->canrier, priv->shadow_canrier);
|
||||||
|
ret = 0;
|
||||||
|
}
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static irqreturn_t mscan_isr(int irq, void *dev_id)
|
||||||
|
{
|
||||||
|
struct net_device *dev = (struct net_device *)dev_id;
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
struct net_device_stats *stats = &dev->stats;
|
||||||
|
u8 cantier, cantflg, canrflg;
|
||||||
|
irqreturn_t ret = IRQ_NONE;
|
||||||
|
|
||||||
|
cantier = in_8(®s->cantier) & MSCAN_TXE;
|
||||||
|
cantflg = in_8(®s->cantflg) & cantier;
|
||||||
|
|
||||||
|
if (cantier && cantflg) {
|
||||||
|
|
||||||
|
struct list_head *tmp, *pos;
|
||||||
|
|
||||||
|
list_for_each_safe(pos, tmp, &priv->tx_head) {
|
||||||
|
struct tx_queue_entry *entry =
|
||||||
|
list_entry(pos, struct tx_queue_entry, list);
|
||||||
|
u8 mask = entry->mask;
|
||||||
|
|
||||||
|
if (!(cantflg & mask))
|
||||||
|
continue;
|
||||||
|
|
||||||
|
out_8(®s->cantbsel, mask);
|
||||||
|
stats->tx_bytes += in_8(®s->tx.dlr);
|
||||||
|
stats->tx_packets++;
|
||||||
|
can_get_echo_skb(dev, entry->id);
|
||||||
|
priv->tx_active &= ~mask;
|
||||||
|
list_del(pos);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (list_empty(&priv->tx_head)) {
|
||||||
|
clear_bit(F_TX_WAIT_ALL, &priv->flags);
|
||||||
|
clear_bit(F_TX_PROGRESS, &priv->flags);
|
||||||
|
priv->cur_pri = 0;
|
||||||
|
} else
|
||||||
|
dev->trans_start = jiffies;
|
||||||
|
|
||||||
|
if (!test_bit(F_TX_WAIT_ALL, &priv->flags))
|
||||||
|
netif_wake_queue(dev);
|
||||||
|
|
||||||
|
out_8(®s->cantier, priv->tx_active);
|
||||||
|
ret = IRQ_HANDLED;
|
||||||
|
}
|
||||||
|
|
||||||
|
canrflg = in_8(®s->canrflg);
|
||||||
|
if ((canrflg & ~MSCAN_STAT_MSK) &&
|
||||||
|
!test_and_set_bit(F_RX_PROGRESS, &priv->flags)) {
|
||||||
|
if (canrflg & ~MSCAN_STAT_MSK) {
|
||||||
|
priv->shadow_canrier = in_8(®s->canrier);
|
||||||
|
out_8(®s->canrier, 0);
|
||||||
|
napi_schedule(&priv->napi);
|
||||||
|
ret = IRQ_HANDLED;
|
||||||
|
} else
|
||||||
|
clear_bit(F_RX_PROGRESS, &priv->flags);
|
||||||
|
}
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_do_set_mode(struct net_device *dev, enum can_mode mode)
|
||||||
|
{
|
||||||
|
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
int ret = 0;
|
||||||
|
|
||||||
|
if (!priv->open_time)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
switch (mode) {
|
||||||
|
case CAN_MODE_SLEEP:
|
||||||
|
case CAN_MODE_STOP:
|
||||||
|
netif_stop_queue(dev);
|
||||||
|
mscan_set_mode(dev,
|
||||||
|
(mode ==
|
||||||
|
CAN_MODE_STOP) ? MSCAN_INIT_MODE :
|
||||||
|
MSCAN_SLEEP_MODE);
|
||||||
|
break;
|
||||||
|
case CAN_MODE_START:
|
||||||
|
if (priv->can.state <= CAN_STATE_BUS_OFF)
|
||||||
|
mscan_set_mode(dev, MSCAN_INIT_MODE);
|
||||||
|
ret = mscan_start(dev);
|
||||||
|
if (ret)
|
||||||
|
break;
|
||||||
|
if (netif_queue_stopped(dev))
|
||||||
|
netif_wake_queue(dev);
|
||||||
|
break;
|
||||||
|
|
||||||
|
default:
|
||||||
|
ret = -EOPNOTSUPP;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_do_set_bittiming(struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
struct can_bittiming *bt = &priv->can.bittiming;
|
||||||
|
u8 btr0, btr1;
|
||||||
|
|
||||||
|
btr0 = BTR0_SET_BRP(bt->brp) | BTR0_SET_SJW(bt->sjw);
|
||||||
|
btr1 = (BTR1_SET_TSEG1(bt->prop_seg + bt->phase_seg1) |
|
||||||
|
BTR1_SET_TSEG2(bt->phase_seg2) |
|
||||||
|
BTR1_SET_SAM(priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES));
|
||||||
|
|
||||||
|
dev_info(dev->dev.parent, "setting BTR0=0x%02x BTR1=0x%02x\n",
|
||||||
|
btr0, btr1);
|
||||||
|
|
||||||
|
out_8(®s->canbtr0, btr0);
|
||||||
|
out_8(®s->canbtr1, btr1);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_open(struct net_device *dev)
|
||||||
|
{
|
||||||
|
int ret;
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
|
||||||
|
/* common open */
|
||||||
|
ret = open_candev(dev);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
napi_enable(&priv->napi);
|
||||||
|
|
||||||
|
ret = request_irq(dev->irq, mscan_isr, 0, dev->name, dev);
|
||||||
|
if (ret < 0) {
|
||||||
|
napi_disable(&priv->napi);
|
||||||
|
printk(KERN_ERR "%s - failed to attach interrupt\n",
|
||||||
|
dev->name);
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
priv->open_time = jiffies;
|
||||||
|
|
||||||
|
out_8(®s->canctl1, in_8(®s->canctl1) & ~MSCAN_LISTEN);
|
||||||
|
|
||||||
|
ret = mscan_start(dev);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
netif_start_queue(dev);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int mscan_close(struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
|
||||||
|
netif_stop_queue(dev);
|
||||||
|
napi_disable(&priv->napi);
|
||||||
|
|
||||||
|
out_8(®s->cantier, 0);
|
||||||
|
out_8(®s->canrier, 0);
|
||||||
|
mscan_set_mode(dev, MSCAN_INIT_MODE);
|
||||||
|
close_candev(dev);
|
||||||
|
free_irq(dev->irq, dev);
|
||||||
|
priv->open_time = 0;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static const struct net_device_ops mscan_netdev_ops = {
|
||||||
|
.ndo_open = mscan_open,
|
||||||
|
.ndo_stop = mscan_close,
|
||||||
|
.ndo_start_xmit = mscan_start_xmit,
|
||||||
|
};
|
||||||
|
|
||||||
|
int register_mscandev(struct net_device *dev, int clock_src)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
u8 ctl1;
|
||||||
|
|
||||||
|
ctl1 = in_8(®s->canctl1);
|
||||||
|
if (clock_src)
|
||||||
|
ctl1 |= MSCAN_CLKSRC;
|
||||||
|
else
|
||||||
|
ctl1 &= ~MSCAN_CLKSRC;
|
||||||
|
|
||||||
|
ctl1 |= MSCAN_CANE;
|
||||||
|
out_8(®s->canctl1, ctl1);
|
||||||
|
udelay(100);
|
||||||
|
|
||||||
|
/* acceptance mask/acceptance code (accept everything) */
|
||||||
|
out_be16(®s->canidar1_0, 0);
|
||||||
|
out_be16(®s->canidar3_2, 0);
|
||||||
|
out_be16(®s->canidar5_4, 0);
|
||||||
|
out_be16(®s->canidar7_6, 0);
|
||||||
|
|
||||||
|
out_be16(®s->canidmr1_0, 0xffff);
|
||||||
|
out_be16(®s->canidmr3_2, 0xffff);
|
||||||
|
out_be16(®s->canidmr5_4, 0xffff);
|
||||||
|
out_be16(®s->canidmr7_6, 0xffff);
|
||||||
|
/* Two 32 bit Acceptance Filters */
|
||||||
|
out_8(®s->canidac, MSCAN_AF_32BIT);
|
||||||
|
|
||||||
|
mscan_set_mode(dev, MSCAN_INIT_MODE);
|
||||||
|
|
||||||
|
return register_candev(dev);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(register_mscandev);
|
||||||
|
|
||||||
|
void unregister_mscandev(struct net_device *dev)
|
||||||
|
{
|
||||||
|
struct mscan_priv *priv = netdev_priv(dev);
|
||||||
|
struct mscan_regs *regs = (struct mscan_regs *)priv->reg_base;
|
||||||
|
mscan_set_mode(dev, MSCAN_INIT_MODE);
|
||||||
|
out_8(®s->canctl1, in_8(®s->canctl1) & ~MSCAN_CANE);
|
||||||
|
unregister_candev(dev);
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(unregister_mscandev);
|
||||||
|
|
||||||
|
struct net_device *alloc_mscandev(void)
|
||||||
|
{
|
||||||
|
struct net_device *dev;
|
||||||
|
struct mscan_priv *priv;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
dev = alloc_candev(sizeof(struct mscan_priv), MSCAN_ECHO_SKB_MAX);
|
||||||
|
if (!dev)
|
||||||
|
return NULL;
|
||||||
|
priv = netdev_priv(dev);
|
||||||
|
|
||||||
|
dev->netdev_ops = &mscan_netdev_ops;
|
||||||
|
|
||||||
|
dev->flags |= IFF_ECHO; /* we support local echo */
|
||||||
|
|
||||||
|
netif_napi_add(dev, &priv->napi, mscan_rx_poll, 8);
|
||||||
|
|
||||||
|
priv->can.bittiming_const = &mscan_bittiming_const;
|
||||||
|
priv->can.do_set_bittiming = mscan_do_set_bittiming;
|
||||||
|
priv->can.do_set_mode = mscan_do_set_mode;
|
||||||
|
|
||||||
|
for (i = 0; i < TX_QUEUE_SIZE; i++) {
|
||||||
|
priv->tx_queue[i].id = i;
|
||||||
|
priv->tx_queue[i].mask = 1 << i;
|
||||||
|
}
|
||||||
|
|
||||||
|
return dev;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(alloc_mscandev);
|
||||||
|
|
||||||
|
MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>");
|
||||||
|
MODULE_LICENSE("GPL v2");
|
||||||
|
MODULE_DESCRIPTION("CAN port driver for a MSCAN based chips");
|
||||||
|
|
@ -0,0 +1,262 @@
|
||||||
|
/*
|
||||||
|
* Definitions of consts/structs to drive the Freescale MSCAN.
|
||||||
|
*
|
||||||
|
* Copyright (C) 2005-2006 Andrey Volkov <avolkov@varma-el.com>,
|
||||||
|
* Varma Electronics Oy
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the version 2 of the GNU General Public License
|
||||||
|
* 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 __MSCAN_H__
|
||||||
|
#define __MSCAN_H__
|
||||||
|
|
||||||
|
#include <linux/types.h>
|
||||||
|
|
||||||
|
/* MSCAN control register 0 (CANCTL0) bits */
|
||||||
|
#define MSCAN_RXFRM 0x80
|
||||||
|
#define MSCAN_RXACT 0x40
|
||||||
|
#define MSCAN_CSWAI 0x20
|
||||||
|
#define MSCAN_SYNCH 0x10
|
||||||
|
#define MSCAN_TIME 0x08
|
||||||
|
#define MSCAN_WUPE 0x04
|
||||||
|
#define MSCAN_SLPRQ 0x02
|
||||||
|
#define MSCAN_INITRQ 0x01
|
||||||
|
|
||||||
|
/* MSCAN control register 1 (CANCTL1) bits */
|
||||||
|
#define MSCAN_CANE 0x80
|
||||||
|
#define MSCAN_CLKSRC 0x40
|
||||||
|
#define MSCAN_LOOPB 0x20
|
||||||
|
#define MSCAN_LISTEN 0x10
|
||||||
|
#define MSCAN_WUPM 0x04
|
||||||
|
#define MSCAN_SLPAK 0x02
|
||||||
|
#define MSCAN_INITAK 0x01
|
||||||
|
|
||||||
|
/* Use the MPC5200 MSCAN variant? */
|
||||||
|
#ifdef CONFIG_PPC
|
||||||
|
#define MSCAN_FOR_MPC5200
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef MSCAN_FOR_MPC5200
|
||||||
|
#define MSCAN_CLKSRC_BUS 0
|
||||||
|
#define MSCAN_CLKSRC_XTAL MSCAN_CLKSRC
|
||||||
|
#else
|
||||||
|
#define MSCAN_CLKSRC_BUS MSCAN_CLKSRC
|
||||||
|
#define MSCAN_CLKSRC_XTAL 0
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* MSCAN receiver flag register (CANRFLG) bits */
|
||||||
|
#define MSCAN_WUPIF 0x80
|
||||||
|
#define MSCAN_CSCIF 0x40
|
||||||
|
#define MSCAN_RSTAT1 0x20
|
||||||
|
#define MSCAN_RSTAT0 0x10
|
||||||
|
#define MSCAN_TSTAT1 0x08
|
||||||
|
#define MSCAN_TSTAT0 0x04
|
||||||
|
#define MSCAN_OVRIF 0x02
|
||||||
|
#define MSCAN_RXF 0x01
|
||||||
|
#define MSCAN_ERR_IF (MSCAN_OVRIF | MSCAN_CSCIF)
|
||||||
|
#define MSCAN_RSTAT_MSK (MSCAN_RSTAT1 | MSCAN_RSTAT0)
|
||||||
|
#define MSCAN_TSTAT_MSK (MSCAN_TSTAT1 | MSCAN_TSTAT0)
|
||||||
|
#define MSCAN_STAT_MSK (MSCAN_RSTAT_MSK | MSCAN_TSTAT_MSK)
|
||||||
|
|
||||||
|
#define MSCAN_STATE_BUS_OFF (MSCAN_RSTAT1 | MSCAN_RSTAT0 | \
|
||||||
|
MSCAN_TSTAT1 | MSCAN_TSTAT0)
|
||||||
|
#define MSCAN_STATE_TX(canrflg) (((canrflg)&MSCAN_TSTAT_MSK)>>2)
|
||||||
|
#define MSCAN_STATE_RX(canrflg) (((canrflg)&MSCAN_RSTAT_MSK)>>4)
|
||||||
|
#define MSCAN_STATE_ACTIVE 0
|
||||||
|
#define MSCAN_STATE_WARNING 1
|
||||||
|
#define MSCAN_STATE_PASSIVE 2
|
||||||
|
#define MSCAN_STATE_BUSOFF 3
|
||||||
|
|
||||||
|
/* MSCAN receiver interrupt enable register (CANRIER) bits */
|
||||||
|
#define MSCAN_WUPIE 0x80
|
||||||
|
#define MSCAN_CSCIE 0x40
|
||||||
|
#define MSCAN_RSTATE1 0x20
|
||||||
|
#define MSCAN_RSTATE0 0x10
|
||||||
|
#define MSCAN_TSTATE1 0x08
|
||||||
|
#define MSCAN_TSTATE0 0x04
|
||||||
|
#define MSCAN_OVRIE 0x02
|
||||||
|
#define MSCAN_RXFIE 0x01
|
||||||
|
|
||||||
|
/* MSCAN transmitter flag register (CANTFLG) bits */
|
||||||
|
#define MSCAN_TXE2 0x04
|
||||||
|
#define MSCAN_TXE1 0x02
|
||||||
|
#define MSCAN_TXE0 0x01
|
||||||
|
#define MSCAN_TXE (MSCAN_TXE2 | MSCAN_TXE1 | MSCAN_TXE0)
|
||||||
|
|
||||||
|
/* MSCAN transmitter interrupt enable register (CANTIER) bits */
|
||||||
|
#define MSCAN_TXIE2 0x04
|
||||||
|
#define MSCAN_TXIE1 0x02
|
||||||
|
#define MSCAN_TXIE0 0x01
|
||||||
|
#define MSCAN_TXIE (MSCAN_TXIE2 | MSCAN_TXIE1 | MSCAN_TXIE0)
|
||||||
|
|
||||||
|
/* MSCAN transmitter message abort request (CANTARQ) bits */
|
||||||
|
#define MSCAN_ABTRQ2 0x04
|
||||||
|
#define MSCAN_ABTRQ1 0x02
|
||||||
|
#define MSCAN_ABTRQ0 0x01
|
||||||
|
|
||||||
|
/* MSCAN transmitter message abort ack (CANTAAK) bits */
|
||||||
|
#define MSCAN_ABTAK2 0x04
|
||||||
|
#define MSCAN_ABTAK1 0x02
|
||||||
|
#define MSCAN_ABTAK0 0x01
|
||||||
|
|
||||||
|
/* MSCAN transmit buffer selection (CANTBSEL) bits */
|
||||||
|
#define MSCAN_TX2 0x04
|
||||||
|
#define MSCAN_TX1 0x02
|
||||||
|
#define MSCAN_TX0 0x01
|
||||||
|
|
||||||
|
/* MSCAN ID acceptance control register (CANIDAC) bits */
|
||||||
|
#define MSCAN_IDAM1 0x20
|
||||||
|
#define MSCAN_IDAM0 0x10
|
||||||
|
#define MSCAN_IDHIT2 0x04
|
||||||
|
#define MSCAN_IDHIT1 0x02
|
||||||
|
#define MSCAN_IDHIT0 0x01
|
||||||
|
|
||||||
|
#define MSCAN_AF_32BIT 0x00
|
||||||
|
#define MSCAN_AF_16BIT MSCAN_IDAM0
|
||||||
|
#define MSCAN_AF_8BIT MSCAN_IDAM1
|
||||||
|
#define MSCAN_AF_CLOSED (MSCAN_IDAM0|MSCAN_IDAM1)
|
||||||
|
#define MSCAN_AF_MASK (~(MSCAN_IDAM0|MSCAN_IDAM1))
|
||||||
|
|
||||||
|
/* MSCAN Miscellaneous Register (CANMISC) bits */
|
||||||
|
#define MSCAN_BOHOLD 0x01
|
||||||
|
|
||||||
|
#ifdef MSCAN_FOR_MPC5200
|
||||||
|
#define _MSCAN_RESERVED_(n, num) u8 _res##n[num]
|
||||||
|
#define _MSCAN_RESERVED_DSR_SIZE 2
|
||||||
|
#else
|
||||||
|
#define _MSCAN_RESERVED_(n, num)
|
||||||
|
#define _MSCAN_RESERVED_DSR_SIZE 0
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/* Structure of the hardware registers */
|
||||||
|
struct mscan_regs {
|
||||||
|
/* (see doc S12MSCANV3/D) MPC5200 MSCAN */
|
||||||
|
u8 canctl0; /* + 0x00 0x00 */
|
||||||
|
u8 canctl1; /* + 0x01 0x01 */
|
||||||
|
_MSCAN_RESERVED_(1, 2); /* + 0x02 */
|
||||||
|
u8 canbtr0; /* + 0x04 0x02 */
|
||||||
|
u8 canbtr1; /* + 0x05 0x03 */
|
||||||
|
_MSCAN_RESERVED_(2, 2); /* + 0x06 */
|
||||||
|
u8 canrflg; /* + 0x08 0x04 */
|
||||||
|
u8 canrier; /* + 0x09 0x05 */
|
||||||
|
_MSCAN_RESERVED_(3, 2); /* + 0x0a */
|
||||||
|
u8 cantflg; /* + 0x0c 0x06 */
|
||||||
|
u8 cantier; /* + 0x0d 0x07 */
|
||||||
|
_MSCAN_RESERVED_(4, 2); /* + 0x0e */
|
||||||
|
u8 cantarq; /* + 0x10 0x08 */
|
||||||
|
u8 cantaak; /* + 0x11 0x09 */
|
||||||
|
_MSCAN_RESERVED_(5, 2); /* + 0x12 */
|
||||||
|
u8 cantbsel; /* + 0x14 0x0a */
|
||||||
|
u8 canidac; /* + 0x15 0x0b */
|
||||||
|
u8 reserved; /* + 0x16 0x0c */
|
||||||
|
_MSCAN_RESERVED_(6, 5); /* + 0x17 */
|
||||||
|
#ifndef MSCAN_FOR_MPC5200
|
||||||
|
u8 canmisc; /* 0x0d */
|
||||||
|
#endif
|
||||||
|
u8 canrxerr; /* + 0x1c 0x0e */
|
||||||
|
u8 cantxerr; /* + 0x1d 0x0f */
|
||||||
|
_MSCAN_RESERVED_(7, 2); /* + 0x1e */
|
||||||
|
u16 canidar1_0; /* + 0x20 0x10 */
|
||||||
|
_MSCAN_RESERVED_(8, 2); /* + 0x22 */
|
||||||
|
u16 canidar3_2; /* + 0x24 0x12 */
|
||||||
|
_MSCAN_RESERVED_(9, 2); /* + 0x26 */
|
||||||
|
u16 canidmr1_0; /* + 0x28 0x14 */
|
||||||
|
_MSCAN_RESERVED_(10, 2); /* + 0x2a */
|
||||||
|
u16 canidmr3_2; /* + 0x2c 0x16 */
|
||||||
|
_MSCAN_RESERVED_(11, 2); /* + 0x2e */
|
||||||
|
u16 canidar5_4; /* + 0x30 0x18 */
|
||||||
|
_MSCAN_RESERVED_(12, 2); /* + 0x32 */
|
||||||
|
u16 canidar7_6; /* + 0x34 0x1a */
|
||||||
|
_MSCAN_RESERVED_(13, 2); /* + 0x36 */
|
||||||
|
u16 canidmr5_4; /* + 0x38 0x1c */
|
||||||
|
_MSCAN_RESERVED_(14, 2); /* + 0x3a */
|
||||||
|
u16 canidmr7_6; /* + 0x3c 0x1e */
|
||||||
|
_MSCAN_RESERVED_(15, 2); /* + 0x3e */
|
||||||
|
struct {
|
||||||
|
u16 idr1_0; /* + 0x40 0x20 */
|
||||||
|
_MSCAN_RESERVED_(16, 2); /* + 0x42 */
|
||||||
|
u16 idr3_2; /* + 0x44 0x22 */
|
||||||
|
_MSCAN_RESERVED_(17, 2); /* + 0x46 */
|
||||||
|
u16 dsr1_0; /* + 0x48 0x24 */
|
||||||
|
_MSCAN_RESERVED_(18, 2); /* + 0x4a */
|
||||||
|
u16 dsr3_2; /* + 0x4c 0x26 */
|
||||||
|
_MSCAN_RESERVED_(19, 2); /* + 0x4e */
|
||||||
|
u16 dsr5_4; /* + 0x50 0x28 */
|
||||||
|
_MSCAN_RESERVED_(20, 2); /* + 0x52 */
|
||||||
|
u16 dsr7_6; /* + 0x54 0x2a */
|
||||||
|
_MSCAN_RESERVED_(21, 2); /* + 0x56 */
|
||||||
|
u8 dlr; /* + 0x58 0x2c */
|
||||||
|
u8:8; /* + 0x59 0x2d */
|
||||||
|
_MSCAN_RESERVED_(22, 2); /* + 0x5a */
|
||||||
|
u16 time; /* + 0x5c 0x2e */
|
||||||
|
} rx;
|
||||||
|
_MSCAN_RESERVED_(23, 2); /* + 0x5e */
|
||||||
|
struct {
|
||||||
|
u16 idr1_0; /* + 0x60 0x30 */
|
||||||
|
_MSCAN_RESERVED_(24, 2); /* + 0x62 */
|
||||||
|
u16 idr3_2; /* + 0x64 0x32 */
|
||||||
|
_MSCAN_RESERVED_(25, 2); /* + 0x66 */
|
||||||
|
u16 dsr1_0; /* + 0x68 0x34 */
|
||||||
|
_MSCAN_RESERVED_(26, 2); /* + 0x6a */
|
||||||
|
u16 dsr3_2; /* + 0x6c 0x36 */
|
||||||
|
_MSCAN_RESERVED_(27, 2); /* + 0x6e */
|
||||||
|
u16 dsr5_4; /* + 0x70 0x38 */
|
||||||
|
_MSCAN_RESERVED_(28, 2); /* + 0x72 */
|
||||||
|
u16 dsr7_6; /* + 0x74 0x3a */
|
||||||
|
_MSCAN_RESERVED_(29, 2); /* + 0x76 */
|
||||||
|
u8 dlr; /* + 0x78 0x3c */
|
||||||
|
u8 tbpr; /* + 0x79 0x3d */
|
||||||
|
_MSCAN_RESERVED_(30, 2); /* + 0x7a */
|
||||||
|
u16 time; /* + 0x7c 0x3e */
|
||||||
|
} tx;
|
||||||
|
_MSCAN_RESERVED_(31, 2); /* + 0x7e */
|
||||||
|
} __attribute__ ((packed));
|
||||||
|
|
||||||
|
#undef _MSCAN_RESERVED_
|
||||||
|
#define MSCAN_REGION sizeof(struct mscan)
|
||||||
|
|
||||||
|
#define TX_QUEUE_SIZE 3
|
||||||
|
|
||||||
|
struct tx_queue_entry {
|
||||||
|
struct list_head list;
|
||||||
|
u8 mask;
|
||||||
|
u8 id;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct mscan_priv {
|
||||||
|
struct can_priv can; /* must be the first member */
|
||||||
|
long open_time;
|
||||||
|
unsigned long flags;
|
||||||
|
void __iomem *reg_base; /* ioremap'ed address to registers */
|
||||||
|
u8 shadow_statflg;
|
||||||
|
u8 shadow_canrier;
|
||||||
|
u8 cur_pri;
|
||||||
|
u8 prev_buf_id;
|
||||||
|
u8 tx_active;
|
||||||
|
|
||||||
|
struct list_head tx_head;
|
||||||
|
struct tx_queue_entry tx_queue[TX_QUEUE_SIZE];
|
||||||
|
struct napi_struct napi;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct net_device *alloc_mscandev(void);
|
||||||
|
/*
|
||||||
|
* clock_src:
|
||||||
|
* 1 = The MSCAN clock source is the onchip Bus Clock.
|
||||||
|
* 0 = The MSCAN clock source is the chip Oscillator Clock.
|
||||||
|
*/
|
||||||
|
extern int register_mscandev(struct net_device *dev, int clock_src);
|
||||||
|
extern void unregister_mscandev(struct net_device *dev);
|
||||||
|
|
||||||
|
#endif /* __MSCAN_H__ */
|
||||||
Loading…
Reference in New Issue