diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/net/can/sja1000/sja1000_isa.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/net/can/sja1000/sja1000_isa.c')
-rw-r--r-- | kernel/drivers/net/can/sja1000/sja1000_isa.c | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/kernel/drivers/net/can/sja1000/sja1000_isa.c b/kernel/drivers/net/can/sja1000/sja1000_isa.c new file mode 100644 index 000000000..e97e6d35b --- /dev/null +++ b/kernel/drivers/net/can/sja1000/sja1000_isa.c @@ -0,0 +1,323 @@ +/* + * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com> + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/netdevice.h> +#include <linux/delay.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/can/dev.h> +#include <linux/can/platform/sja1000.h> + +#include "sja1000.h" + +#define DRV_NAME "sja1000_isa" + +#define MAXDEV 8 + +MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); +MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus"); +MODULE_LICENSE("GPL v2"); + +#define CLK_DEFAULT 16000000 /* 16 MHz */ +#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF) +#define OCR_DEFAULT OCR_TX0_PUSHPULL + +static unsigned long port[MAXDEV]; +static unsigned long mem[MAXDEV]; +static int irq[MAXDEV]; +static int clk[MAXDEV]; +static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; +static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; +static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; +static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */ + +module_param_array(port, ulong, NULL, S_IRUGO); +MODULE_PARM_DESC(port, "I/O port number"); + +module_param_array(mem, ulong, NULL, S_IRUGO); +MODULE_PARM_DESC(mem, "I/O memory address"); + +module_param_array(indirect, int, NULL, S_IRUGO); +MODULE_PARM_DESC(indirect, "Indirect access via address and data port"); + +module_param_array(irq, int, NULL, S_IRUGO); +MODULE_PARM_DESC(irq, "IRQ number"); + +module_param_array(clk, int, NULL, S_IRUGO); +MODULE_PARM_DESC(clk, "External oscillator clock frequency " + "(default=16000000 [16 MHz])"); + +module_param_array(cdr, byte, NULL, S_IRUGO); +MODULE_PARM_DESC(cdr, "Clock divider register " + "(default=0x48 [CDR_CBP | CDR_CLK_OFF])"); + +module_param_array(ocr, byte, NULL, S_IRUGO); +MODULE_PARM_DESC(ocr, "Output control register " + "(default=0x18 [OCR_TX0_PUSHPULL])"); + +#define SJA1000_IOSIZE 0x20 +#define SJA1000_IOSIZE_INDIRECT 0x02 + +static struct platform_device *sja1000_isa_devs[MAXDEV]; + +static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg) +{ + return readb(priv->reg_base + reg); +} + +static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv, + int reg, u8 val) +{ + writeb(val, priv->reg_base + reg); +} + +static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg) +{ + return inb((unsigned long)priv->reg_base + reg); +} + +static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv, + int reg, u8 val) +{ + outb(val, (unsigned long)priv->reg_base + reg); +} + +static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv, + int reg) +{ + unsigned long flags, base = (unsigned long)priv->reg_base; + u8 readval; + + spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); + outb(reg, base); + readval = inb(base + 1); + spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); + + return readval; +} + +static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, + int reg, u8 val) +{ + unsigned long flags, base = (unsigned long)priv->reg_base; + + spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); + outb(reg, base); + outb(val, base + 1); + spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); +} + +static int sja1000_isa_probe(struct platform_device *pdev) +{ + struct net_device *dev; + struct sja1000_priv *priv; + void __iomem *base = NULL; + int iosize = SJA1000_IOSIZE; + int idx = pdev->id; + int err; + + dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", + idx, port[idx], mem[idx], irq[idx]); + + if (mem[idx]) { + if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { + err = -EBUSY; + goto exit; + } + base = ioremap_nocache(mem[idx], iosize); + if (!base) { + err = -ENOMEM; + goto exit_release; + } + } else { + if (indirect[idx] > 0 || + (indirect[idx] == -1 && indirect[0] > 0)) + iosize = SJA1000_IOSIZE_INDIRECT; + if (!request_region(port[idx], iosize, DRV_NAME)) { + err = -EBUSY; + goto exit; + } + } + + dev = alloc_sja1000dev(0); + if (!dev) { + err = -ENOMEM; + goto exit_unmap; + } + priv = netdev_priv(dev); + + dev->irq = irq[idx]; + priv->irq_flags = IRQF_SHARED; + if (mem[idx]) { + priv->reg_base = base; + dev->base_addr = mem[idx]; + priv->read_reg = sja1000_isa_mem_read_reg; + priv->write_reg = sja1000_isa_mem_write_reg; + } else { + priv->reg_base = (void __iomem *)port[idx]; + dev->base_addr = port[idx]; + + if (iosize == SJA1000_IOSIZE_INDIRECT) { + priv->read_reg = sja1000_isa_port_read_reg_indirect; + priv->write_reg = sja1000_isa_port_write_reg_indirect; + spin_lock_init(&indirect_lock[idx]); + } else { + priv->read_reg = sja1000_isa_port_read_reg; + priv->write_reg = sja1000_isa_port_write_reg; + } + } + + if (clk[idx]) + priv->can.clock.freq = clk[idx] / 2; + else if (clk[0]) + priv->can.clock.freq = clk[0] / 2; + else + priv->can.clock.freq = CLK_DEFAULT / 2; + + if (ocr[idx] != 0xff) + priv->ocr = ocr[idx]; + else if (ocr[0] != 0xff) + priv->ocr = ocr[0]; + else + priv->ocr = OCR_DEFAULT; + + if (cdr[idx] != 0xff) + priv->cdr = cdr[idx]; + else if (cdr[0] != 0xff) + priv->cdr = cdr[0]; + else + priv->cdr = CDR_DEFAULT; + + platform_set_drvdata(pdev, dev); + SET_NETDEV_DEV(dev, &pdev->dev); + dev->dev_id = idx; + + err = register_sja1000dev(dev); + if (err) { + dev_err(&pdev->dev, "registering %s failed (err=%d)\n", + DRV_NAME, err); + goto exit_unmap; + } + + dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n", + DRV_NAME, priv->reg_base, dev->irq); + return 0; + + exit_unmap: + if (mem[idx]) + iounmap(base); + exit_release: + if (mem[idx]) + release_mem_region(mem[idx], iosize); + else + release_region(port[idx], iosize); + exit: + return err; +} + +static int sja1000_isa_remove(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct sja1000_priv *priv = netdev_priv(dev); + int idx = pdev->id; + + unregister_sja1000dev(dev); + + if (mem[idx]) { + iounmap(priv->reg_base); + release_mem_region(mem[idx], SJA1000_IOSIZE); + } else { + if (priv->read_reg == sja1000_isa_port_read_reg_indirect) + release_region(port[idx], SJA1000_IOSIZE_INDIRECT); + else + release_region(port[idx], SJA1000_IOSIZE); + } + free_sja1000dev(dev); + + return 0; +} + +static struct platform_driver sja1000_isa_driver = { + .probe = sja1000_isa_probe, + .remove = sja1000_isa_remove, + .driver = { + .name = DRV_NAME, + }, +}; + +static int __init sja1000_isa_init(void) +{ + int idx, err; + + for (idx = 0; idx < MAXDEV; idx++) { + if ((port[idx] || mem[idx]) && irq[idx]) { + sja1000_isa_devs[idx] = + platform_device_alloc(DRV_NAME, idx); + if (!sja1000_isa_devs[idx]) { + err = -ENOMEM; + goto exit_free_devices; + } + err = platform_device_add(sja1000_isa_devs[idx]); + if (err) { + platform_device_put(sja1000_isa_devs[idx]); + goto exit_free_devices; + } + pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " + "irq=%d\n", + DRV_NAME, idx, port[idx], mem[idx], irq[idx]); + } else if (idx == 0 || port[idx] || mem[idx]) { + pr_err("%s: insufficient parameters supplied\n", + DRV_NAME); + err = -EINVAL; + goto exit_free_devices; + } + } + + err = platform_driver_register(&sja1000_isa_driver); + if (err) + goto exit_free_devices; + + pr_info("Legacy %s driver for max. %d devices registered\n", + DRV_NAME, MAXDEV); + + return 0; + +exit_free_devices: + while (--idx >= 0) { + if (sja1000_isa_devs[idx]) + platform_device_unregister(sja1000_isa_devs[idx]); + } + + return err; +} + +static void __exit sja1000_isa_exit(void) +{ + int idx; + + platform_driver_unregister(&sja1000_isa_driver); + for (idx = 0; idx < MAXDEV; idx++) { + if (sja1000_isa_devs[idx]) + platform_device_unregister(sja1000_isa_devs[idx]); + } +} + +module_init(sja1000_isa_init); +module_exit(sja1000_isa_exit); |