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Linux/drivers/ata/pata_ixp4xx_cf.c

  1 /*
  2  * ixp4xx PATA/Compact Flash driver
  3  * Copyright (C) 2006-07 Tower Technologies
  4  * Author: Alessandro Zummo <a.zummo@towertech.it>
  5  *
  6  * An ATA driver to handle a Compact Flash connected
  7  * to the ixp4xx expansion bus in TrueIDE mode. The CF
  8  * must have it chip selects connected to two CS lines
  9  * on the ixp4xx. In the irq is not available, you might
 10  * want to modify both this driver and libata to run in
 11  * polling mode.
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License version 2 as
 15  * published by the Free Software Foundation.
 16  *
 17  */
 18 
 19 #include <linux/kernel.h>
 20 #include <linux/module.h>
 21 #include <linux/libata.h>
 22 #include <linux/irq.h>
 23 #include <linux/platform_device.h>
 24 #include <scsi/scsi_host.h>
 25 
 26 #define DRV_NAME        "pata_ixp4xx_cf"
 27 #define DRV_VERSION     "0.2"
 28 
 29 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error)
 30 {
 31         struct ata_device *dev;
 32 
 33         ata_for_each_dev(dev, link, ENABLED) {
 34                 ata_dev_info(dev, "configured for PIO0\n");
 35                 dev->pio_mode = XFER_PIO_0;
 36                 dev->xfer_mode = XFER_PIO_0;
 37                 dev->xfer_shift = ATA_SHIFT_PIO;
 38                 dev->flags |= ATA_DFLAG_PIO;
 39         }
 40         return 0;
 41 }
 42 
 43 static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev,
 44                                 unsigned char *buf, unsigned int buflen, int rw)
 45 {
 46         unsigned int i;
 47         unsigned int words = buflen >> 1;
 48         u16 *buf16 = (u16 *) buf;
 49         struct ata_port *ap = dev->link->ap;
 50         void __iomem *mmio = ap->ioaddr.data_addr;
 51         struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev);
 52 
 53         /* set the expansion bus in 16bit mode and restore
 54          * 8 bit mode after the transaction.
 55          */
 56         *data->cs0_cfg &= ~(0x01);
 57         udelay(100);
 58 
 59         /* Transfer multiple of 2 bytes */
 60         if (rw == READ)
 61                 for (i = 0; i < words; i++)
 62                         buf16[i] = readw(mmio);
 63         else
 64                 for (i = 0; i < words; i++)
 65                         writew(buf16[i], mmio);
 66 
 67         /* Transfer trailing 1 byte, if any. */
 68         if (unlikely(buflen & 0x01)) {
 69                 u16 align_buf[1] = { 0 };
 70                 unsigned char *trailing_buf = buf + buflen - 1;
 71 
 72                 if (rw == READ) {
 73                         align_buf[0] = readw(mmio);
 74                         memcpy(trailing_buf, align_buf, 1);
 75                 } else {
 76                         memcpy(align_buf, trailing_buf, 1);
 77                         writew(align_buf[0], mmio);
 78                 }
 79                 words++;
 80         }
 81 
 82         udelay(100);
 83         *data->cs0_cfg |= 0x01;
 84 
 85         return words << 1;
 86 }
 87 
 88 static struct scsi_host_template ixp4xx_sht = {
 89         ATA_PIO_SHT(DRV_NAME),
 90 };
 91 
 92 static struct ata_port_operations ixp4xx_port_ops = {
 93         .inherits               = &ata_sff_port_ops,
 94         .sff_data_xfer          = ixp4xx_mmio_data_xfer,
 95         .cable_detect           = ata_cable_40wire,
 96         .set_mode               = ixp4xx_set_mode,
 97 };
 98 
 99 static void ixp4xx_setup_port(struct ata_port *ap,
100                               struct ixp4xx_pata_data *data,
101                               unsigned long raw_cs0, unsigned long raw_cs1)
102 {
103         struct ata_ioports *ioaddr = &ap->ioaddr;
104         unsigned long raw_cmd = raw_cs0;
105         unsigned long raw_ctl = raw_cs1 + 0x06;
106 
107         ioaddr->cmd_addr        = data->cs0;
108         ioaddr->altstatus_addr  = data->cs1 + 0x06;
109         ioaddr->ctl_addr        = data->cs1 + 0x06;
110 
111         ata_sff_std_ports(ioaddr);
112 
113 #ifndef __ARMEB__
114 
115         /* adjust the addresses to handle the address swizzling of the
116          * ixp4xx in little endian mode.
117          */
118 
119         *(unsigned long *)&ioaddr->data_addr            ^= 0x02;
120         *(unsigned long *)&ioaddr->cmd_addr             ^= 0x03;
121         *(unsigned long *)&ioaddr->altstatus_addr       ^= 0x03;
122         *(unsigned long *)&ioaddr->ctl_addr             ^= 0x03;
123         *(unsigned long *)&ioaddr->error_addr           ^= 0x03;
124         *(unsigned long *)&ioaddr->feature_addr         ^= 0x03;
125         *(unsigned long *)&ioaddr->nsect_addr           ^= 0x03;
126         *(unsigned long *)&ioaddr->lbal_addr            ^= 0x03;
127         *(unsigned long *)&ioaddr->lbam_addr            ^= 0x03;
128         *(unsigned long *)&ioaddr->lbah_addr            ^= 0x03;
129         *(unsigned long *)&ioaddr->device_addr          ^= 0x03;
130         *(unsigned long *)&ioaddr->status_addr          ^= 0x03;
131         *(unsigned long *)&ioaddr->command_addr         ^= 0x03;
132 
133         raw_cmd ^= 0x03;
134         raw_ctl ^= 0x03;
135 #endif
136 
137         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl);
138 }
139 
140 static int ixp4xx_pata_probe(struct platform_device *pdev)
141 {
142         unsigned int irq;
143         struct resource *cs0, *cs1;
144         struct ata_host *host;
145         struct ata_port *ap;
146         struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev);
147         int ret;
148 
149         cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0);
150         cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
151 
152         if (!cs0 || !cs1)
153                 return -EINVAL;
154 
155         /* allocate host */
156         host = ata_host_alloc(&pdev->dev, 1);
157         if (!host)
158                 return -ENOMEM;
159 
160         /* acquire resources and fill host */
161         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
162         if (ret)
163                 return ret;
164 
165         data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000);
166         data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000);
167 
168         if (!data->cs0 || !data->cs1)
169                 return -ENOMEM;
170 
171         irq = platform_get_irq(pdev, 0);
172         if (irq)
173                 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING);
174 
175         /* Setup expansion bus chip selects */
176         *data->cs0_cfg = data->cs0_bits;
177         *data->cs1_cfg = data->cs1_bits;
178 
179         ap = host->ports[0];
180 
181         ap->ops = &ixp4xx_port_ops;
182         ap->pio_mask = ATA_PIO4;
183         ap->flags |= ATA_FLAG_NO_ATAPI;
184 
185         ixp4xx_setup_port(ap, data, cs0->start, cs1->start);
186 
187         ata_print_version_once(&pdev->dev, DRV_VERSION);
188 
189         /* activate host */
190         return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht);
191 }
192 
193 static struct platform_driver ixp4xx_pata_platform_driver = {
194         .driver  = {
195                 .name   = DRV_NAME,
196                 .owner  = THIS_MODULE,
197         },
198         .probe          = ixp4xx_pata_probe,
199         .remove         = ata_platform_remove_one,
200 };
201 
202 module_platform_driver(ixp4xx_pata_platform_driver);
203 
204 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
205 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA");
206 MODULE_LICENSE("GPL");
207 MODULE_VERSION(DRV_VERSION);
208 MODULE_ALIAS("platform:" DRV_NAME);
209 

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