Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Driver for SJA1000 CAN controllers on the OpenFirmware platform bus |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the version 2 of the GNU General Public License |
| 8 | * as published by the Free Software Foundation |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software Foundation, |
| 17 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | /* This is a generic driver for SJA1000 chips on the OpenFirmware platform |
| 21 | * bus found on embedded PowerPC systems. You need a SJA1000 CAN node |
| 22 | * definition in your flattened device tree source (DTS) file similar to: |
| 23 | * |
| 24 | * can@3,100 { |
| 25 | * compatible = "nxp,sja1000"; |
| 26 | * reg = <3 0x100 0x80>; |
| 27 | * interrupts = <2 0>; |
| 28 | * interrupt-parent = <&mpic>; |
| 29 | * nxp,external-clock-frequency = <16000000>; |
| 30 | * }; |
| 31 | * |
| 32 | * See "Documentation/powerpc/dts-bindings/can/sja1000.txt" for further |
| 33 | * information. |
| 34 | */ |
| 35 | |
| 36 | #include <linux/kernel.h> |
| 37 | #include <linux/module.h> |
| 38 | #include <linux/interrupt.h> |
| 39 | #include <linux/netdevice.h> |
| 40 | #include <linux/delay.h> |
Stephen Rothwell | 8d0f7ce | 2011-06-29 02:55:28 -0700 | [diff] [blame^] | 41 | #include <linux/io.h> |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 42 | #include <linux/can/dev.h> |
| 43 | |
| 44 | #include <linux/of_platform.h> |
| 45 | #include <asm/prom.h> |
| 46 | |
| 47 | #include "sja1000.h" |
| 48 | |
| 49 | #define DRV_NAME "sja1000_of_platform" |
| 50 | |
| 51 | MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>"); |
| 52 | MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the OF platform bus"); |
| 53 | MODULE_LICENSE("GPL v2"); |
| 54 | |
| 55 | #define SJA1000_OFP_CAN_CLOCK (16000000 / 2) |
| 56 | |
| 57 | #define SJA1000_OFP_OCR OCR_TX0_PULLDOWN |
| 58 | #define SJA1000_OFP_CDR (CDR_CBP | CDR_CLK_OFF) |
| 59 | |
| 60 | static u8 sja1000_ofp_read_reg(const struct sja1000_priv *priv, int reg) |
| 61 | { |
| 62 | return in_8(priv->reg_base + reg); |
| 63 | } |
| 64 | |
| 65 | static void sja1000_ofp_write_reg(const struct sja1000_priv *priv, |
| 66 | int reg, u8 val) |
| 67 | { |
| 68 | out_8(priv->reg_base + reg, val); |
| 69 | } |
| 70 | |
Grant Likely | 2dc1158 | 2010-08-06 09:25:50 -0600 | [diff] [blame] | 71 | static int __devexit sja1000_ofp_remove(struct platform_device *ofdev) |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 72 | { |
| 73 | struct net_device *dev = dev_get_drvdata(&ofdev->dev); |
| 74 | struct sja1000_priv *priv = netdev_priv(dev); |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 75 | struct device_node *np = ofdev->dev.of_node; |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 76 | struct resource res; |
| 77 | |
| 78 | dev_set_drvdata(&ofdev->dev, NULL); |
| 79 | |
| 80 | unregister_sja1000dev(dev); |
| 81 | free_sja1000dev(dev); |
| 82 | iounmap(priv->reg_base); |
| 83 | irq_dispose_mapping(dev->irq); |
| 84 | |
| 85 | of_address_to_resource(np, 0, &res); |
| 86 | release_mem_region(res.start, resource_size(&res)); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
Grant Likely | 7488876 | 2011-02-22 21:05:51 -0700 | [diff] [blame] | 91 | static int __devinit sja1000_ofp_probe(struct platform_device *ofdev) |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 92 | { |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 93 | struct device_node *np = ofdev->dev.of_node; |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 94 | struct net_device *dev; |
| 95 | struct sja1000_priv *priv; |
| 96 | struct resource res; |
| 97 | const u32 *prop; |
| 98 | int err, irq, res_size, prop_size; |
| 99 | void __iomem *base; |
| 100 | |
| 101 | err = of_address_to_resource(np, 0, &res); |
| 102 | if (err) { |
| 103 | dev_err(&ofdev->dev, "invalid address\n"); |
| 104 | return err; |
| 105 | } |
| 106 | |
| 107 | res_size = resource_size(&res); |
| 108 | |
| 109 | if (!request_mem_region(res.start, res_size, DRV_NAME)) { |
Joe Perches | b1323c8 | 2010-11-12 11:37:59 +0000 | [diff] [blame] | 110 | dev_err(&ofdev->dev, "couldn't request %pR\n", &res); |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 111 | return -EBUSY; |
| 112 | } |
| 113 | |
| 114 | base = ioremap_nocache(res.start, res_size); |
| 115 | if (!base) { |
Joe Perches | b1323c8 | 2010-11-12 11:37:59 +0000 | [diff] [blame] | 116 | dev_err(&ofdev->dev, "couldn't ioremap %pR\n", &res); |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 117 | err = -ENOMEM; |
| 118 | goto exit_release_mem; |
| 119 | } |
| 120 | |
| 121 | irq = irq_of_parse_and_map(np, 0); |
| 122 | if (irq == NO_IRQ) { |
| 123 | dev_err(&ofdev->dev, "no irq found\n"); |
| 124 | err = -ENODEV; |
| 125 | goto exit_unmap_mem; |
| 126 | } |
| 127 | |
| 128 | dev = alloc_sja1000dev(0); |
| 129 | if (!dev) { |
| 130 | err = -ENOMEM; |
| 131 | goto exit_dispose_irq; |
| 132 | } |
| 133 | |
| 134 | priv = netdev_priv(dev); |
| 135 | |
| 136 | priv->read_reg = sja1000_ofp_read_reg; |
| 137 | priv->write_reg = sja1000_ofp_write_reg; |
| 138 | |
| 139 | prop = of_get_property(np, "nxp,external-clock-frequency", &prop_size); |
| 140 | if (prop && (prop_size == sizeof(u32))) |
| 141 | priv->can.clock.freq = *prop / 2; |
| 142 | else |
| 143 | priv->can.clock.freq = SJA1000_OFP_CAN_CLOCK; /* default */ |
| 144 | |
| 145 | prop = of_get_property(np, "nxp,tx-output-mode", &prop_size); |
| 146 | if (prop && (prop_size == sizeof(u32))) |
| 147 | priv->ocr |= *prop & OCR_MODE_MASK; |
| 148 | else |
| 149 | priv->ocr |= OCR_MODE_NORMAL; /* default */ |
| 150 | |
| 151 | prop = of_get_property(np, "nxp,tx-output-config", &prop_size); |
| 152 | if (prop && (prop_size == sizeof(u32))) |
| 153 | priv->ocr |= (*prop << OCR_TX_SHIFT) & OCR_TX_MASK; |
| 154 | else |
| 155 | priv->ocr |= OCR_TX0_PULLDOWN; /* default */ |
| 156 | |
| 157 | prop = of_get_property(np, "nxp,clock-out-frequency", &prop_size); |
| 158 | if (prop && (prop_size == sizeof(u32)) && *prop) { |
| 159 | u32 divider = priv->can.clock.freq * 2 / *prop; |
| 160 | |
| 161 | if (divider > 1) |
| 162 | priv->cdr |= divider / 2 - 1; |
| 163 | else |
| 164 | priv->cdr |= CDR_CLKOUT_MASK; |
| 165 | } else { |
| 166 | priv->cdr |= CDR_CLK_OFF; /* default */ |
| 167 | } |
| 168 | |
| 169 | prop = of_get_property(np, "nxp,no-comparator-bypass", NULL); |
| 170 | if (!prop) |
| 171 | priv->cdr |= CDR_CBP; /* default */ |
| 172 | |
| 173 | priv->irq_flags = IRQF_SHARED; |
| 174 | priv->reg_base = base; |
| 175 | |
| 176 | dev->irq = irq; |
| 177 | |
| 178 | dev_info(&ofdev->dev, |
| 179 | "reg_base=0x%p irq=%d clock=%d ocr=0x%02x cdr=0x%02x\n", |
| 180 | priv->reg_base, dev->irq, priv->can.clock.freq, |
| 181 | priv->ocr, priv->cdr); |
| 182 | |
| 183 | dev_set_drvdata(&ofdev->dev, dev); |
| 184 | SET_NETDEV_DEV(dev, &ofdev->dev); |
| 185 | |
| 186 | err = register_sja1000dev(dev); |
| 187 | if (err) { |
| 188 | dev_err(&ofdev->dev, "registering %s failed (err=%d)\n", |
| 189 | DRV_NAME, err); |
| 190 | goto exit_free_sja1000; |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | |
| 195 | exit_free_sja1000: |
| 196 | free_sja1000dev(dev); |
| 197 | exit_dispose_irq: |
| 198 | irq_dispose_mapping(irq); |
| 199 | exit_unmap_mem: |
| 200 | iounmap(base); |
| 201 | exit_release_mem: |
| 202 | release_mem_region(res.start, res_size); |
| 203 | |
| 204 | return err; |
| 205 | } |
| 206 | |
| 207 | static struct of_device_id __devinitdata sja1000_ofp_table[] = { |
| 208 | {.compatible = "nxp,sja1000"}, |
| 209 | {}, |
| 210 | }; |
Anton Vorontsov | e72701a | 2009-10-14 14:54:52 -0700 | [diff] [blame] | 211 | MODULE_DEVICE_TABLE(of, sja1000_ofp_table); |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 212 | |
Grant Likely | 7488876 | 2011-02-22 21:05:51 -0700 | [diff] [blame] | 213 | static struct platform_driver sja1000_ofp_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 214 | .driver = { |
| 215 | .owner = THIS_MODULE, |
| 216 | .name = DRV_NAME, |
| 217 | .of_match_table = sja1000_ofp_table, |
| 218 | }, |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 219 | .probe = sja1000_ofp_probe, |
| 220 | .remove = __devexit_p(sja1000_ofp_remove), |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 221 | }; |
| 222 | |
| 223 | static int __init sja1000_ofp_init(void) |
| 224 | { |
Grant Likely | 7488876 | 2011-02-22 21:05:51 -0700 | [diff] [blame] | 225 | return platform_driver_register(&sja1000_ofp_driver); |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 226 | } |
| 227 | module_init(sja1000_ofp_init); |
| 228 | |
| 229 | static void __exit sja1000_ofp_exit(void) |
| 230 | { |
Grant Likely | 7488876 | 2011-02-22 21:05:51 -0700 | [diff] [blame] | 231 | return platform_driver_unregister(&sja1000_ofp_driver); |
Wolfgang Grandegger | d1a277c | 2009-05-30 07:55:50 +0000 | [diff] [blame] | 232 | }; |
| 233 | module_exit(sja1000_ofp_exit); |