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_link_for_each_dev(dev, link) { 34 if (ata_dev_enabled(dev)) { 35 ata_dev_printk(dev, KERN_INFO, "configured for PIO0\n"); 36 dev->pio_mode = XFER_PIO_0; 37 dev->xfer_mode = XFER_PIO_0; 38 dev->xfer_shift = ATA_SHIFT_PIO; 39 dev->flags |= ATA_DFLAG_PIO; 40 } 41 } 42 return 0; 43 } 44 45 static unsigned int ixp4xx_mmio_data_xfer(struct ata_device *dev, 46 unsigned char *buf, unsigned int buflen, int rw) 47 { 48 unsigned int i; 49 unsigned int words = buflen >> 1; 50 u16 *buf16 = (u16 *) buf; 51 struct ata_port *ap = dev->link->ap; 52 void __iomem *mmio = ap->ioaddr.data_addr; 53 struct ixp4xx_pata_data *data = ap->host->dev->platform_data; 54 55 /* set the expansion bus in 16bit mode and restore 56 * 8 bit mode after the transaction. 57 */ 58 *data->cs0_cfg &= ~(0x01); 59 udelay(100); 60 61 /* Transfer multiple of 2 bytes */ 62 if (rw == READ) 63 for (i = 0; i < words; i++) 64 buf16[i] = readw(mmio); 65 else 66 for (i = 0; i < words; i++) 67 writew(buf16[i], mmio); 68 69 /* Transfer trailing 1 byte, if any. */ 70 if (unlikely(buflen & 0x01)) { 71 u16 align_buf[1] = { 0 }; 72 unsigned char *trailing_buf = buf + buflen - 1; 73 74 if (rw == READ) { 75 align_buf[0] = readw(mmio); 76 memcpy(trailing_buf, align_buf, 1); 77 } else { 78 memcpy(align_buf, trailing_buf, 1); 79 writew(align_buf[0], mmio); 80 } 81 words++; 82 } 83 84 udelay(100); 85 *data->cs0_cfg |= 0x01; 86 87 return words << 1; 88 } 89 90 static struct scsi_host_template ixp4xx_sht = { 91 ATA_PIO_SHT(DRV_NAME), 92 }; 93 94 static struct ata_port_operations ixp4xx_port_ops = { 95 .inherits = &ata_sff_port_ops, 96 .sff_data_xfer = ixp4xx_mmio_data_xfer, 97 .cable_detect = ata_cable_40wire, 98 .set_mode = ixp4xx_set_mode, 99 }; 100 101 static void ixp4xx_setup_port(struct ata_port *ap, 102 struct ixp4xx_pata_data *data, 103 unsigned long raw_cs0, unsigned long raw_cs1) 104 { 105 struct ata_ioports *ioaddr = &ap->ioaddr; 106 unsigned long raw_cmd = raw_cs0; 107 unsigned long raw_ctl = raw_cs1 + 0x06; 108 109 ioaddr->cmd_addr = data->cs0; 110 ioaddr->altstatus_addr = data->cs1 + 0x06; 111 ioaddr->ctl_addr = data->cs1 + 0x06; 112 113 ata_sff_std_ports(ioaddr); 114 115 #ifndef __ARMEB__ 116 117 /* adjust the addresses to handle the address swizzling of the 118 * ixp4xx in little endian mode. 119 */ 120 121 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 122 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 123 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 124 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 125 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 126 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 127 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 128 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 129 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 130 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 131 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 132 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 133 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 134 135 raw_cmd ^= 0x03; 136 raw_ctl ^= 0x03; 137 #endif 138 139 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl); 140 } 141 142 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev) 143 { 144 unsigned int irq; 145 struct resource *cs0, *cs1; 146 struct ata_host *host; 147 struct ata_port *ap; 148 struct ixp4xx_pata_data *data = pdev->dev.platform_data; 149 150 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 151 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 152 153 if (!cs0 || !cs1) 154 return -EINVAL; 155 156 /* allocate host */ 157 host = ata_host_alloc(&pdev->dev, 1); 158 if (!host) 159 return -ENOMEM; 160 161 /* acquire resources and fill host */ 162 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; 163 164 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000); 165 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000); 166 167 if (!data->cs0 || !data->cs1) 168 return -ENOMEM; 169 170 irq = platform_get_irq(pdev, 0); 171 if (irq) 172 set_irq_type(irq, IRQT_RISING); 173 174 /* Setup expansion bus chip selects */ 175 *data->cs0_cfg = data->cs0_bits; 176 *data->cs1_cfg = data->cs1_bits; 177 178 ap = host->ports[0]; 179 180 ap->ops = &ixp4xx_port_ops; 181 ap->pio_mask = 0x1f; /* PIO4 */ 182 ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI; 183 184 ixp4xx_setup_port(ap, data, cs0->start, cs1->start); 185 186 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n"); 187 188 /* activate host */ 189 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht); 190 } 191 192 static __devexit int ixp4xx_pata_remove(struct platform_device *dev) 193 { 194 struct ata_host *host = platform_get_drvdata(dev); 195 196 ata_host_detach(host); 197 198 return 0; 199 } 200 201 static struct platform_driver ixp4xx_pata_platform_driver = { 202 .driver = { 203 .name = DRV_NAME, 204 .owner = THIS_MODULE, 205 }, 206 .probe = ixp4xx_pata_probe, 207 .remove = __devexit_p(ixp4xx_pata_remove), 208 }; 209 210 static int __init ixp4xx_pata_init(void) 211 { 212 return platform_driver_register(&ixp4xx_pata_platform_driver); 213 } 214 215 static void __exit ixp4xx_pata_exit(void) 216 { 217 platform_driver_unregister(&ixp4xx_pata_platform_driver); 218 } 219 220 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 221 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 222 MODULE_LICENSE("GPL"); 223 MODULE_VERSION(DRV_VERSION); 224 225 module_init(ixp4xx_pata_init); 226 module_exit(ixp4xx_pata_exit); 227