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Linux/drivers/ata/pata_rb532_cf.c

  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 

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