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_BASE 0x0800 43 #define RB500_CF_REG_ERR 0x080D 44 #define RB500_CF_REG_CTRL 0x080E 45 /* 32bit buffered data register offset */ 46 #define RB500_CF_REG_DBUF32 0x0C00 47 48 struct rb532_cf_info { 49 void __iomem *iobase; 50 unsigned int gpio_line; 51 unsigned int irq; 52 }; 53 54 /* ------------------------------------------------------------------------ */ 55 56 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) 57 { 58 struct ata_host *ah = dev_instance; 59 struct rb532_cf_info *info = ah->private_data; 60 61 if (gpio_get_value(info->gpio_line)) { 62 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 63 ata_sff_interrupt(info->irq, dev_instance); 64 } else { 65 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 66 } 67 68 return IRQ_HANDLED; 69 } 70 71 static struct ata_port_operations rb532_pata_port_ops = { 72 .inherits = &ata_sff_port_ops, 73 .sff_data_xfer = ata_sff_data_xfer32, 74 }; 75 76 /* ------------------------------------------------------------------------ */ 77 78 static struct scsi_host_template rb532_pata_sht = { 79 ATA_PIO_SHT(DRV_NAME), 80 }; 81 82 /* ------------------------------------------------------------------------ */ 83 84 static void rb532_pata_setup_ports(struct ata_host *ah) 85 { 86 struct rb532_cf_info *info = ah->private_data; 87 struct ata_port *ap; 88 89 ap = ah->ports[0]; 90 91 ap->ops = &rb532_pata_port_ops; 92 ap->pio_mask = ATA_PIO4; 93 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; 94 95 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; 96 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; 97 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; 98 99 ata_sff_std_ports(&ap->ioaddr); 100 101 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; 102 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; 103 } 104 105 static __devinit int rb532_pata_driver_probe(struct platform_device *pdev) 106 { 107 int irq; 108 int gpio; 109 struct resource *res; 110 struct ata_host *ah; 111 struct rb532_cf_info *info; 112 int ret; 113 114 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 115 if (!res) { 116 dev_err(&pdev->dev, "no IOMEM resource found\n"); 117 return -EINVAL; 118 } 119 120 irq = platform_get_irq(pdev, 0); 121 if (irq <= 0) { 122 dev_err(&pdev->dev, "no IRQ resource found\n"); 123 return -ENOENT; 124 } 125 126 gpio = irq_to_gpio(irq); 127 if (gpio < 0) { 128 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 129 return -ENOENT; 130 } 131 132 ret = gpio_request(gpio, DRV_NAME); 133 if (ret) { 134 dev_err(&pdev->dev, "GPIO request failed\n"); 135 return ret; 136 } 137 138 /* allocate host */ 139 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 140 if (!ah) 141 return -ENOMEM; 142 143 platform_set_drvdata(pdev, ah); 144 145 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 146 if (!info) 147 return -ENOMEM; 148 149 ah->private_data = info; 150 info->gpio_line = gpio; 151 info->irq = irq; 152 153 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, 154 resource_size(res)); 155 if (!info->iobase) 156 return -ENOMEM; 157 158 ret = gpio_direction_input(gpio); 159 if (ret) { 160 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", 161 ret); 162 goto err_free_gpio; 163 } 164 165 rb532_pata_setup_ports(ah); 166 167 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 168 IRQF_TRIGGER_LOW, &rb532_pata_sht); 169 if (ret) 170 goto err_free_gpio; 171 172 return 0; 173 174 err_free_gpio: 175 gpio_free(gpio); 176 177 return ret; 178 } 179 180 static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) 181 { 182 struct ata_host *ah = platform_get_drvdata(pdev); 183 struct rb532_cf_info *info = ah->private_data; 184 185 ata_host_detach(ah); 186 gpio_free(info->gpio_line); 187 188 return 0; 189 } 190 191 /* work with hotplug and coldplug */ 192 MODULE_ALIAS("platform:" DRV_NAME); 193 194 static struct platform_driver rb532_pata_platform_driver = { 195 .probe = rb532_pata_driver_probe, 196 .remove = __devexit_p(rb532_pata_driver_remove), 197 .driver = { 198 .name = DRV_NAME, 199 .owner = THIS_MODULE, 200 }, 201 }; 202 203 /* ------------------------------------------------------------------------ */ 204 205 #define DRV_INFO DRV_DESC " version " DRV_VERSION 206 207 static int __init rb532_pata_module_init(void) 208 { 209 printk(KERN_INFO DRV_INFO "\n"); 210 211 return platform_driver_register(&rb532_pata_platform_driver); 212 } 213 214 static void __exit rb532_pata_module_exit(void) 215 { 216 platform_driver_unregister(&rb532_pata_platform_driver); 217 } 218 219 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 220 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 221 MODULE_DESCRIPTION(DRV_DESC); 222 MODULE_VERSION(DRV_VERSION); 223 MODULE_LICENSE("GPL"); 224 225 module_init(rb532_pata_module_init); 226 module_exit(rb532_pata_module_exit); 227