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 #include <linux/gpio.h> 31 32 #include <linux/libata.h> 33 #include <scsi/scsi_host.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 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 63 ata_sff_interrupt(info->irq, dev_instance); 64 } else { 65 irq_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 94 ap->ioaddr.cmd_addr = info->iobase + RB500_CF_REG_BASE; 95 ap->ioaddr.ctl_addr = info->iobase + RB500_CF_REG_CTRL; 96 ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL; 97 98 ata_sff_std_ports(&ap->ioaddr); 99 100 ap->ioaddr.data_addr = info->iobase + RB500_CF_REG_DBUF32; 101 ap->ioaddr.error_addr = info->iobase + RB500_CF_REG_ERR; 102 } 103 104 static int rb532_pata_driver_probe(struct platform_device *pdev) 105 { 106 int irq; 107 int gpio; 108 struct resource *res; 109 struct ata_host *ah; 110 struct rb532_cf_info *info; 111 int ret; 112 113 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 114 if (!res) { 115 dev_err(&pdev->dev, "no IOMEM resource found\n"); 116 return -EINVAL; 117 } 118 119 irq = platform_get_irq(pdev, 0); 120 if (irq <= 0) { 121 dev_err(&pdev->dev, "no IRQ resource found\n"); 122 return -ENOENT; 123 } 124 125 gpio = irq_to_gpio(irq); 126 if (gpio < 0) { 127 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 128 return -ENOENT; 129 } 130 131 ret = gpio_request(gpio, DRV_NAME); 132 if (ret) { 133 dev_err(&pdev->dev, "GPIO request failed\n"); 134 return ret; 135 } 136 137 /* allocate host */ 138 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 139 if (!ah) 140 return -ENOMEM; 141 142 platform_set_drvdata(pdev, ah); 143 144 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 145 if (!info) 146 return -ENOMEM; 147 148 ah->private_data = info; 149 info->gpio_line = gpio; 150 info->irq = irq; 151 152 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, 153 resource_size(res)); 154 if (!info->iobase) 155 return -ENOMEM; 156 157 ret = gpio_direction_input(gpio); 158 if (ret) { 159 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", 160 ret); 161 goto err_free_gpio; 162 } 163 164 rb532_pata_setup_ports(ah); 165 166 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 167 IRQF_TRIGGER_LOW, &rb532_pata_sht); 168 if (ret) 169 goto err_free_gpio; 170 171 return 0; 172 173 err_free_gpio: 174 gpio_free(gpio); 175 176 return ret; 177 } 178 179 static int rb532_pata_driver_remove(struct platform_device *pdev) 180 { 181 struct ata_host *ah = platform_get_drvdata(pdev); 182 struct rb532_cf_info *info = ah->private_data; 183 184 ata_host_detach(ah); 185 gpio_free(info->gpio_line); 186 187 return 0; 188 } 189 190 static struct platform_driver rb532_pata_platform_driver = { 191 .probe = rb532_pata_driver_probe, 192 .remove = rb532_pata_driver_remove, 193 .driver = { 194 .name = DRV_NAME, 195 }, 196 }; 197 198 #define DRV_INFO DRV_DESC " version " DRV_VERSION 199 200 module_platform_driver(rb532_pata_platform_driver); 201 202 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 203 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 204 MODULE_DESCRIPTION(DRV_DESC); 205 MODULE_VERSION(DRV_VERSION); 206 MODULE_LICENSE("GPL"); 207 MODULE_ALIAS("platform:" DRV_NAME); 208