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Linux/drivers/ata/pata_platform.c

  1 /*
  2  * Generic platform device PATA driver
  3  *
  4  * Copyright (C) 2006 - 2007  Paul Mundt
  5  *
  6  * Based on pata_pcmcia:
  7  *
  8  *   Copyright 2005-2006 Red Hat Inc, all rights reserved.
  9  *
 10  * This file is subject to the terms and conditions of the GNU General Public
 11  * License.  See the file "COPYING" in the main directory of this archive
 12  * for more details.
 13  */
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/init.h>
 17 #include <linux/blkdev.h>
 18 #include <scsi/scsi_host.h>
 19 #include <linux/ata.h>
 20 #include <linux/libata.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/ata_platform.h>
 23 
 24 #define DRV_NAME "pata_platform"
 25 #define DRV_VERSION "1.2"
 26 
 27 static int pio_mask = 1;
 28 
 29 /*
 30  * Provide our own set_mode() as we don't want to change anything that has
 31  * already been configured..
 32  */
 33 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
 34 {
 35         struct ata_device *dev;
 36 
 37         ata_for_each_dev(dev, link, ENABLED) {
 38                 /* We don't really care */
 39                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
 40                 dev->xfer_shift = ATA_SHIFT_PIO;
 41                 dev->flags |= ATA_DFLAG_PIO;
 42                 ata_dev_info(dev, "configured for PIO\n");
 43         }
 44         return 0;
 45 }
 46 
 47 static struct scsi_host_template pata_platform_sht = {
 48         ATA_PIO_SHT(DRV_NAME),
 49 };
 50 
 51 static struct ata_port_operations pata_platform_port_ops = {
 52         .inherits               = &ata_sff_port_ops,
 53         .sff_data_xfer          = ata_sff_data_xfer_noirq,
 54         .cable_detect           = ata_cable_unknown,
 55         .set_mode               = pata_platform_set_mode,
 56 };
 57 
 58 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
 59                                      unsigned int shift)
 60 {
 61         /* Fixup the port shift for platforms that need it */
 62         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
 63         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
 64         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
 65         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
 66         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
 67         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
 68         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
 69         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
 70         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
 71         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
 72 }
 73 
 74 /**
 75  *      __pata_platform_probe           -       attach a platform interface
 76  *      @dev: device
 77  *      @io_res: Resource representing I/O base
 78  *      @ctl_res: Resource representing CTL base
 79  *      @irq_res: Resource representing IRQ and its flags
 80  *      @ioport_shift: I/O port shift
 81  *      @__pio_mask: PIO mask
 82  *
 83  *      Register a platform bus IDE interface. Such interfaces are PIO and we
 84  *      assume do not support IRQ sharing.
 85  *
 86  *      Platform devices are expected to contain at least 2 resources per port:
 87  *
 88  *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
 89  *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
 90  *
 91  *      and optionally:
 92  *
 93  *              - IRQ      (IORESOURCE_IRQ)
 94  *
 95  *      If the base resources are both mem types, the ioremap() is handled
 96  *      here. For IORESOURCE_IO, it's assumed that there's no remapping
 97  *      necessary.
 98  *
 99  *      If no IRQ resource is present, PIO polling mode is used instead.
100  */
101 int __pata_platform_probe(struct device *dev, struct resource *io_res,
102                           struct resource *ctl_res, struct resource *irq_res,
103                           unsigned int ioport_shift, int __pio_mask)
104 {
105         struct ata_host *host;
106         struct ata_port *ap;
107         unsigned int mmio;
108         int irq = 0;
109         int irq_flags = 0;
110 
111         /*
112          * Check for MMIO
113          */
114         mmio = (( io_res->flags == IORESOURCE_MEM) &&
115                 (ctl_res->flags == IORESOURCE_MEM));
116 
117         /*
118          * And the IRQ
119          */
120         if (irq_res && irq_res->start > 0) {
121                 irq = irq_res->start;
122                 irq_flags = irq_res->flags;
123         }
124 
125         /*
126          * Now that that's out of the way, wire up the port..
127          */
128         host = ata_host_alloc(dev, 1);
129         if (!host)
130                 return -ENOMEM;
131         ap = host->ports[0];
132 
133         ap->ops = &pata_platform_port_ops;
134         ap->pio_mask = __pio_mask;
135         ap->flags |= ATA_FLAG_SLAVE_POSS;
136 
137         /*
138          * Use polling mode if there's no IRQ
139          */
140         if (!irq) {
141                 ap->flags |= ATA_FLAG_PIO_POLLING;
142                 ata_port_desc(ap, "no IRQ, using PIO polling");
143         }
144 
145         /*
146          * Handle the MMIO case
147          */
148         if (mmio) {
149                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
150                                 resource_size(io_res));
151                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
152                                 resource_size(ctl_res));
153         } else {
154                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
155                                 resource_size(io_res));
156                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
157                                 resource_size(ctl_res));
158         }
159         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
160                 dev_err(dev, "failed to map IO/CTL base\n");
161                 return -ENOMEM;
162         }
163 
164         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
165 
166         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
167 
168         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
169                       (unsigned long long)io_res->start,
170                       (unsigned long long)ctl_res->start);
171 
172         /* activate */
173         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
174                                  irq_flags, &pata_platform_sht);
175 }
176 EXPORT_SYMBOL_GPL(__pata_platform_probe);
177 
178 static int pata_platform_probe(struct platform_device *pdev)
179 {
180         struct resource *io_res;
181         struct resource *ctl_res;
182         struct resource *irq_res;
183         struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
184 
185         /*
186          * Simple resource validation ..
187          */
188         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
189                 dev_err(&pdev->dev, "invalid number of resources\n");
190                 return -EINVAL;
191         }
192 
193         /*
194          * Get the I/O base first
195          */
196         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
197         if (io_res == NULL) {
198                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
199                 if (unlikely(io_res == NULL))
200                         return -EINVAL;
201         }
202 
203         /*
204          * Then the CTL base
205          */
206         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
207         if (ctl_res == NULL) {
208                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
209                 if (unlikely(ctl_res == NULL))
210                         return -EINVAL;
211         }
212 
213         /*
214          * And the IRQ
215          */
216         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
217         if (irq_res)
218                 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
219 
220         return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
221                                      pp_info ? pp_info->ioport_shift : 0,
222                                      pio_mask);
223 }
224 
225 static struct platform_driver pata_platform_driver = {
226         .probe          = pata_platform_probe,
227         .remove         = ata_platform_remove_one,
228         .driver = {
229                 .name           = DRV_NAME,
230                 .owner          = THIS_MODULE,
231         },
232 };
233 
234 module_platform_driver(pata_platform_driver);
235 
236 module_param(pio_mask, int, 0);
237 
238 MODULE_AUTHOR("Paul Mundt");
239 MODULE_DESCRIPTION("low-level driver for platform device ATA");
240 MODULE_LICENSE("GPL");
241 MODULE_VERSION(DRV_VERSION);
242 MODULE_ALIAS("platform:" DRV_NAME);
243 

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