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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  *      @sht: scsi_host_template to use when registering
 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                           struct scsi_host_template *sht)
105 {
106         struct ata_host *host;
107         struct ata_port *ap;
108         unsigned int mmio;
109         int irq = 0;
110         int irq_flags = 0;
111 
112         /*
113          * Check for MMIO
114          */
115         mmio = (( io_res->flags == IORESOURCE_MEM) &&
116                 (ctl_res->flags == IORESOURCE_MEM));
117 
118         /*
119          * And the IRQ
120          */
121         if (irq_res && irq_res->start > 0) {
122                 irq = irq_res->start;
123                 irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
124         }
125 
126         /*
127          * Now that that's out of the way, wire up the port..
128          */
129         host = ata_host_alloc(dev, 1);
130         if (!host)
131                 return -ENOMEM;
132         ap = host->ports[0];
133 
134         ap->ops = &pata_platform_port_ops;
135         ap->pio_mask = __pio_mask;
136         ap->flags |= ATA_FLAG_SLAVE_POSS;
137 
138         /*
139          * Use polling mode if there's no IRQ
140          */
141         if (!irq) {
142                 ap->flags |= ATA_FLAG_PIO_POLLING;
143                 ata_port_desc(ap, "no IRQ, using PIO polling");
144         }
145 
146         /*
147          * Handle the MMIO case
148          */
149         if (mmio) {
150                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
151                                 resource_size(io_res));
152                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
153                                 resource_size(ctl_res));
154         } else {
155                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
156                                 resource_size(io_res));
157                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
158                                 resource_size(ctl_res));
159         }
160         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
161                 dev_err(dev, "failed to map IO/CTL base\n");
162                 return -ENOMEM;
163         }
164 
165         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
166 
167         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
168 
169         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
170                       (unsigned long long)io_res->start,
171                       (unsigned long long)ctl_res->start);
172 
173         /* activate */
174         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
175                                  irq_flags, sht);
176 }
177 EXPORT_SYMBOL_GPL(__pata_platform_probe);
178 
179 static int pata_platform_probe(struct platform_device *pdev)
180 {
181         struct resource *io_res;
182         struct resource *ctl_res;
183         struct resource *irq_res;
184         struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
185 
186         /*
187          * Simple resource validation ..
188          */
189         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
190                 dev_err(&pdev->dev, "invalid number of resources\n");
191                 return -EINVAL;
192         }
193 
194         /*
195          * Get the I/O base first
196          */
197         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
198         if (io_res == NULL) {
199                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
200                 if (unlikely(io_res == NULL))
201                         return -EINVAL;
202         }
203 
204         /*
205          * Then the CTL base
206          */
207         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
208         if (ctl_res == NULL) {
209                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
210                 if (unlikely(ctl_res == NULL))
211                         return -EINVAL;
212         }
213 
214         /*
215          * And the IRQ
216          */
217         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 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, &pata_platform_sht);
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         },
230 };
231 
232 module_platform_driver(pata_platform_driver);
233 
234 module_param(pio_mask, int, 0);
235 
236 MODULE_AUTHOR("Paul Mundt");
237 MODULE_DESCRIPTION("low-level driver for platform device ATA");
238 MODULE_LICENSE("GPL");
239 MODULE_VERSION(DRV_VERSION);
240 MODULE_ALIAS("platform:" DRV_NAME);
241 

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