1 /* 2 * A low-level PATA driver to handle a Compact Flash connected on the 3 * Mikrotik's RouterBoard 532 board. 4 * 5 * Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org> 6 * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org> 7 * 8 * This file was based on: drivers/ata/pata_ixp4xx_cf.c 9 * Copyright (C) 2006-07 Tower Technologies 10 * Author: Alessandro Zummo <a.zummo@towertech.it> 11 * 12 * Also was based on the driver for Linux 2.4.xx published by Mikrotik for 13 * their RouterBoard 1xx and 5xx series devices. The original Mikrotik code 14 * seems not to have a license. 15 * 16 * This program is free software; you can redistribute it and/or modify 17 * it under the terms of the GNU General Public License version 2 as 18 * published by the Free Software Foundation. 19 * 20 */ 21 22 #include <linux/kernel.h> 23 #include <linux/module.h> 24 #include <linux/platform_device.h> 25 26 #include <linux/io.h> 27 #include <linux/interrupt.h> 28 #include <linux/irq.h> 29 30 #include <linux/libata.h> 31 #include <scsi/scsi_host.h> 32 33 #include <asm/gpio.h> 34 35 #define DRV_NAME "pata-rb532-cf" 36 #define DRV_VERSION "0.1.0" 37 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" 38 39 #define RB500_CF_MAXPORTS 1 40 #define RB500_CF_IO_DELAY 400 41 42 #define RB500_CF_REG_CMD 0x0800 43 #define RB500_CF_REG_CTRL 0x080E 44 #define RB500_CF_REG_DATA 0x0C00 45 46 struct rb532_cf_info { 47 void __iomem *iobase; 48 unsigned int gpio_line; 49 int frozen; 50 unsigned int irq; 51 }; 52 53 /* ------------------------------------------------------------------------ */ 54 55 static inline void rb532_pata_finish_io(struct ata_port *ap) 56 { 57 struct ata_host *ah = ap->host; 58 struct rb532_cf_info *info = ah->private_data; 59 60 ata_sff_altstatus(ap); 61 ndelay(RB500_CF_IO_DELAY); 62 63 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 64 } 65 66 static void rb532_pata_exec_command(struct ata_port *ap, 67 const struct ata_taskfile *tf) 68 { 69 writeb(tf->command, ap->ioaddr.command_addr); 70 rb532_pata_finish_io(ap); 71 } 72 73 static void rb532_pata_data_xfer(struct ata_device *adev, unsigned char *buf, 74 unsigned int buflen, int write_data) 75 { 76 struct ata_port *ap = adev->link->ap; 77 void __iomem *ioaddr = ap->ioaddr.data_addr; 78 79 if (write_data) { 80 for (; buflen > 0; buflen--, buf++) 81 writeb(*buf, ioaddr); 82 } else { 83 for (; buflen > 0; buflen--, buf++) 84 *buf = readb(ioaddr); 85 } 86 87 rb532_pata_finish_io(adev->link->ap); 88 } 89 90 static void rb532_pata_freeze(struct ata_port *ap) 91 { 92 struct rb532_cf_info *info = ap->host->private_data; 93 94 info->frozen = 1; 95 } 96 97 static void rb532_pata_thaw(struct ata_port *ap) 98 { 99 struct rb532_cf_info *info = ap->host->private_data; 100 101 info->frozen = 0; 102 } 103 104 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) 105 { 106 struct ata_host *ah = dev_instance; 107 struct rb532_cf_info *info = ah->private_data; 108 109 if (gpio_get_value(info->gpio_line)) { 110 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 111 if (!info->frozen) 112 ata_sff_interrupt(info->irq, dev_instance); 113 } else { 114 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 115 } 116 117 return IRQ_HANDLED; 118 } 119 120 static struct ata_port_operations rb532_pata_port_ops = { 121 .inherits = &ata_sff_port_ops, 122 .sff_exec_command = rb532_pata_exec_command, 123 .sff_data_xfer = rb532_pata_data_xfer, 124 .freeze = rb532_pata_freeze, 125 .thaw = rb532_pata_thaw, 126 }; 127 128 /* ------------------------------------------------------------------------ */ 129 130 static struct scsi_host_template rb532_pata_sht = { 131 ATA_PIO_SHT(DRV_NAME), 132 }; 133 134 /* ------------------------------------------------------------------------ */ 135 136 static void rb532_pata_setup_ports(struct ata_host *ah) 137 { 138 struct rb532_cf_info *info = ah->private_data; 139 struct ata_port *ap; 140 141 ap = ah->ports[0]; 142 143 ap->ops = &rb532_pata_port_ops; 144 ap->pio_mask = 0x1f; /* PIO4 */ 145 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; 146 147 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_CMD; 148 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; 149 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; 150 151 ata_sff_std_ports(&ap->ioaddr); 152 153 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DATA; 154 } 155 156 static __devinit int rb532_pata_driver_probe(struct platform_device *pdev) 157 { 158 unsigned int irq; 159 int gpio; 160 struct resource *res; 161 struct ata_host *ah; 162 struct rb532_cf_info *info; 163 int ret; 164 165 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 166 if (!res) { 167 dev_err(&pdev->dev, "no IOMEM resource found\n"); 168 return -EINVAL; 169 } 170 171 irq = platform_get_irq(pdev, 0); 172 if (irq <= 0) { 173 dev_err(&pdev->dev, "no IRQ resource found\n"); 174 return -ENOENT; 175 } 176 177 gpio = irq_to_gpio(irq); 178 if (gpio < 0) { 179 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 180 return -ENOENT; 181 } 182 183 ret = gpio_request(gpio, DRV_NAME); 184 if (ret) { 185 dev_err(&pdev->dev, "GPIO request failed\n"); 186 return ret; 187 } 188 189 /* allocate host */ 190 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 191 if (!ah) 192 return -ENOMEM; 193 194 platform_set_drvdata(pdev, ah); 195 196 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 197 if (!info) 198 return -ENOMEM; 199 200 ah->private_data = info; 201 info->gpio_line = gpio; 202 info->irq = irq; 203 204 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, 205 res->end - res->start + 1); 206 if (!info->iobase) 207 return -ENOMEM; 208 209 ret = gpio_direction_input(gpio); 210 if (ret) { 211 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", 212 ret); 213 goto err_free_gpio; 214 } 215 216 rb532_pata_setup_ports(ah); 217 218 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 219 IRQF_TRIGGER_LOW, &rb532_pata_sht); 220 if (ret) 221 goto err_free_gpio; 222 223 return 0; 224 225 err_free_gpio: 226 gpio_free(gpio); 227 228 return ret; 229 } 230 231 static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) 232 { 233 struct ata_host *ah = platform_get_drvdata(pdev); 234 struct rb532_cf_info *info = ah->private_data; 235 236 ata_host_detach(ah); 237 gpio_free(info->gpio_line); 238 239 return 0; 240 } 241 242 /* work with hotplug and coldplug */ 243 MODULE_ALIAS("platform:" DRV_NAME); 244 245 static struct platform_driver rb532_pata_platform_driver = { 246 .probe = rb532_pata_driver_probe, 247 .remove = __devexit_p(rb532_pata_driver_remove), 248 .driver = { 249 .name = DRV_NAME, 250 .owner = THIS_MODULE, 251 }, 252 }; 253 254 /* ------------------------------------------------------------------------ */ 255 256 #define DRV_INFO DRV_DESC " version " DRV_VERSION 257 258 static int __init rb532_pata_module_init(void) 259 { 260 printk(KERN_INFO DRV_INFO "\n"); 261 262 return platform_driver_register(&rb532_pata_platform_driver); 263 } 264 265 static void __exit rb532_pata_module_exit(void) 266 { 267 platform_driver_unregister(&rb532_pata_platform_driver); 268 } 269 270 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 271 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 272 MODULE_DESCRIPTION(DRV_DESC); 273 MODULE_VERSION(DRV_VERSION); 274 MODULE_LICENSE("GPL"); 275 276 module_init(rb532_pata_module_init); 277 module_exit(rb532_pata_module_exit); 278