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 #include <asm/mach-rc32434/rb.h> 36 37 #define DRV_NAME "pata-rb532-cf" 38 #define DRV_VERSION "0.1.0" 39 #define DRV_DESC "PATA driver for RouterBOARD 532 Compact Flash" 40 41 #define RB500_CF_MAXPORTS 1 42 #define RB500_CF_IO_DELAY 400 43 44 #define RB500_CF_REG_BASE 0x0800 45 #define RB500_CF_REG_ERR 0x080D 46 #define RB500_CF_REG_CTRL 0x080E 47 /* 32bit buffered data register offset */ 48 #define RB500_CF_REG_DBUF32 0x0C00 49 50 struct rb532_cf_info { 51 void __iomem *iobase; 52 unsigned int gpio_line; 53 unsigned int irq; 54 }; 55 56 /* ------------------------------------------------------------------------ */ 57 58 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance) 59 { 60 struct ata_host *ah = dev_instance; 61 struct rb532_cf_info *info = ah->private_data; 62 63 if (gpio_get_value(info->gpio_line)) { 64 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW); 65 ata_sff_interrupt(info->irq, dev_instance); 66 } else { 67 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH); 68 } 69 70 return IRQ_HANDLED; 71 } 72 73 static struct ata_port_operations rb532_pata_port_ops = { 74 .inherits = &ata_sff_port_ops, 75 .sff_data_xfer = ata_sff_data_xfer32, 76 }; 77 78 /* ------------------------------------------------------------------------ */ 79 80 static struct scsi_host_template rb532_pata_sht = { 81 ATA_PIO_SHT(DRV_NAME), 82 }; 83 84 /* ------------------------------------------------------------------------ */ 85 86 static void rb532_pata_setup_ports(struct ata_host *ah) 87 { 88 struct rb532_cf_info *info = ah->private_data; 89 struct ata_port *ap; 90 91 ap = ah->ports[0]; 92 93 ap->ops = &rb532_pata_port_ops; 94 ap->pio_mask = ATA_PIO4; 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 } 105 106 static 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 cf_device *pdata; 113 struct rb532_cf_info *info; 114 int ret; 115 116 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 117 if (!res) { 118 dev_err(&pdev->dev, "no IOMEM resource found\n"); 119 return -EINVAL; 120 } 121 122 irq = platform_get_irq(pdev, 0); 123 if (irq <= 0) { 124 dev_err(&pdev->dev, "no IRQ resource found\n"); 125 return -ENOENT; 126 } 127 128 pdata = dev_get_platdata(&pdev->dev); 129 if (!pdata) { 130 dev_err(&pdev->dev, "no platform data specified\n"); 131 return -EINVAL; 132 } 133 134 gpio = pdata->gpio_pin; 135 if (gpio < 0) { 136 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq); 137 return -ENOENT; 138 } 139 140 ret = gpio_request(gpio, DRV_NAME); 141 if (ret) { 142 dev_err(&pdev->dev, "GPIO request failed\n"); 143 return ret; 144 } 145 146 /* allocate host */ 147 ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS); 148 if (!ah) 149 return -ENOMEM; 150 151 platform_set_drvdata(pdev, ah); 152 153 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); 154 if (!info) 155 return -ENOMEM; 156 157 ah->private_data = info; 158 info->gpio_line = gpio; 159 info->irq = irq; 160 161 info->iobase = devm_ioremap_nocache(&pdev->dev, res->start, 162 resource_size(res)); 163 if (!info->iobase) 164 return -ENOMEM; 165 166 ret = gpio_direction_input(gpio); 167 if (ret) { 168 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n", 169 ret); 170 goto err_free_gpio; 171 } 172 173 rb532_pata_setup_ports(ah); 174 175 ret = ata_host_activate(ah, irq, rb532_pata_irq_handler, 176 IRQF_TRIGGER_LOW, &rb532_pata_sht); 177 if (ret) 178 goto err_free_gpio; 179 180 return 0; 181 182 err_free_gpio: 183 gpio_free(gpio); 184 185 return ret; 186 } 187 188 static int rb532_pata_driver_remove(struct platform_device *pdev) 189 { 190 struct ata_host *ah = platform_get_drvdata(pdev); 191 struct rb532_cf_info *info = ah->private_data; 192 193 ata_host_detach(ah); 194 gpio_free(info->gpio_line); 195 196 return 0; 197 } 198 199 static struct platform_driver rb532_pata_platform_driver = { 200 .probe = rb532_pata_driver_probe, 201 .remove = rb532_pata_driver_remove, 202 .driver = { 203 .name = DRV_NAME, 204 }, 205 }; 206 207 #define DRV_INFO DRV_DESC " version " DRV_VERSION 208 209 module_platform_driver(rb532_pata_platform_driver); 210 211 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); 212 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); 213 MODULE_DESCRIPTION(DRV_DESC); 214 MODULE_VERSION(DRV_VERSION); 215 MODULE_LICENSE("GPL"); 216 MODULE_ALIAS("platform:" DRV_NAME); 217