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 49 struct rb532_cf_info { 50 void __iomem *iobase; 51 unsigned int gpio_line; 52 unsigned int irq; 53 }; 54 55 /* ------------------------------------------------------------------------ */ 56 57 static 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 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 64 ata_sff_interrupt(info->irq, dev_instance); 65 } else { 66 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 67 } 68 69 return IRQ_HANDLED; 70 } 71 72 static 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 79 static struct scsi_host_template rb532_pata_sht = { 80 ATA_PIO_SHT(DRV_NAME), 81 }; 82 83 /* ------------------------------------------------------------------------ */ 84 85 static 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 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 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 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 static struct platform_driver rb532_pata_platform_driver = { 192 .probe = rb532_pata_driver_probe, 193 .remove = rb532_pata_driver_remove, 194 .driver = { 195 .name = DRV_NAME, 196 .owner = THIS_MODULE, 197 }, 198 }; 199 200 #define DRV_INFO DRV_DESC " version " DRV_VERSION 201 202 module_platform_driver(rb532_pata_platform_driver); 203 204 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 205 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 206 MODULE_DESCRIPTION(DRV_DESC); 207 MODULE_VERSION(DRV_VERSION); 208 MODULE_LICENSE("GPL"); 209 MODULE_ALIAS("platform:" DRV_NAME); 210