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

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