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/gfp.h> 23#include <linux/kernel.h> 24#include <linux/module.h> 25#include <linux/platform_device.h> 26 27#include <linux/io.h> 28#include <linux/interrupt.h> 29#include <linux/irq.h> 30 31#include <linux/libata.h> 32#include <scsi/scsi_host.h> 33 34#include <asm/gpio.h> 35 36#define DRV_NAME "pata-rb532-cf" 37#define DRV_VERSION "0.1.0" 38#define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" 39 40#define RB500_CF_MAXPORTS 1 41#define RB500_CF_IO_DELAY 400 42 43#define RB500_CF_REG_BASE 0x0800 44#define RB500_CF_REG_ERR 0x080D 45#define RB500_CF_REG_CTRL 0x080E 46/* 32bit buffered data register offset */ 47#define RB500_CF_REG_DBUF32 0x0C00 48 49struct rb532_cf_info { 50 void __iomem *iobase; 51 unsigned int gpio_line; 52 unsigned int irq; 53}; 54 55/* ------------------------------------------------------------------------ */ 56 57static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) 58{ 59 struct ata_host *ah = dev_instance; 60 struct rb532_cf_info *info = ah->private_data; 61 62 if (gpio_get_value(info->gpio_line)) { 63 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 64 ata_sff_interrupt(info->irq, dev_instance); 65 } else { 66 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 67 } 68 69 return IRQ_HANDLED; 70} 71 72static struct ata_port_operations rb532_pata_port_ops = { 73 .inherits = &ata_sff_port_ops, 74 .sff_data_xfer = ata_sff_data_xfer32, 75}; 76 77/* ------------------------------------------------------------------------ */ 78 79static struct scsi_host_template rb532_pata_sht = { 80 ATA_PIO_SHT(DRV_NAME), 81}; 82 83/* ------------------------------------------------------------------------ */ 84 85static void rb532_pata_setup_ports(struct ata_host *ah) 86{ 87 struct rb532_cf_info *info = ah->private_data; 88 struct ata_port *ap; 89 90 ap = ah->ports[0]; 91 92 ap->ops = &rb532_pata_port_ops; 93 ap->pio_mask = ATA_PIO4; 94 ap->flags = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO; 95 96 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; 97 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; 98 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; 99 100 ata_sff_std_ports(&ap->ioaddr); 101 102 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; 103 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; 104} 105 106static __devinit int rb532_pata_driver_probe(struct platform_device *pdev) 107{ 108 int irq; 109 int gpio; 110 struct resource *res; 111 struct ata_host *ah; 112 struct rb532_cf_info *info; 113 int ret; 114 115 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 116 if (!res) { 117 dev_err(&pdev->dev, "no IOMEM resource found\n"); 118 return -EINVAL; 119 } 120 121 irq = platform_get_irq(pdev, 0); 122 if (irq <= 0) { 123 dev_err(&pdev->dev, "no IRQ resource found\n"); 124 return -ENOENT; 125 } 126 127 gpio = irq_to_gpio(irq); 128 if (gpio < 0) { 129 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 130 return -ENOENT; 131 } 132 133 ret = gpio_request(gpio, DRV_NAME); 134 if (ret) { 135 dev_err(&pdev->dev, "GPIO request failed\n"); 136 return ret; 137 } 138 139 /* allocate host */ 140 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 141 if (!ah) 142 return -ENOMEM; 143 144 platform_set_drvdata(pdev, ah); 145 146 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 147 if (!info) 148 return -ENOMEM; 149 150 ah->private_data = info; 151 info->gpio_line = gpio; 152 info->irq = irq; 153 154 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, 155 resource_size(res)); 156 if (!info->iobase) 157 return -ENOMEM; 158 159 ret = gpio_direction_input(gpio); 160 if (ret) { 161 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", 162 ret); 163 goto err_free_gpio; 164 } 165 166 rb532_pata_setup_ports(ah); 167 168 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 169 IRQF_TRIGGER_LOW, &rb532_pata_sht); 170 if (ret) 171 goto err_free_gpio; 172 173 return 0; 174 175err_free_gpio: 176 gpio_free(gpio); 177 178 return ret; 179} 180 181static __devexit int rb532_pata_driver_remove(struct platform_device *pdev) 182{ 183 struct ata_host *ah = platform_get_drvdata(pdev); 184 struct rb532_cf_info *info = ah->private_data; 185 186 ata_host_detach(ah); 187 gpio_free(info->gpio_line); 188 189 return 0; 190} 191 192/* work with hotplug and coldplug */ 193MODULE_ALIAS("platform:" DRV_NAME); 194 195static struct platform_driver rb532_pata_platform_driver = { 196 .probe = rb532_pata_driver_probe, 197 .remove = __devexit_p(rb532_pata_driver_remove), 198 .driver = { 199 .name = DRV_NAME, 200 .owner = THIS_MODULE, 201 }, 202}; 203 204/* ------------------------------------------------------------------------ */ 205 206#define DRV_INFO DRV_DESC " version " DRV_VERSION 207 208static int __init rb532_pata_module_init(void) 209{ 210 printk(KERN_INFO DRV_INFO "\n"); 211 212 return platform_driver_register(&rb532_pata_platform_driver); 213} 214 215static void __exit rb532_pata_module_exit(void) 216{ 217 platform_driver_unregister(&rb532_pata_platform_driver); 218} 219 220MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 221MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 222MODULE_DESCRIPTION(DRV_DESC); 223MODULE_VERSION(DRV_VERSION); 224MODULE_LICENSE("GPL"); 225 226module_init(rb532_pata_module_init); 227module_exit(rb532_pata_module_exit); 228