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 29static 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_printk(dev, KERN_INFO, "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 43static 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 = ap->host->dev->platform_data; 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 88static struct scsi_host_template ixp4xx_sht = { 89 ATA_PIO_SHT(DRV_NAME), 90}; 91 92static 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 99static 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 140static __devinit 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 = pdev->dev.platform_data; 147 148 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 149 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 150 151 if (!cs0 || !cs1) 152 return -EINVAL; 153 154 /* allocate host */ 155 host = ata_host_alloc(&pdev->dev, 1); 156 if (!host) 157 return -ENOMEM; 158 159 /* acquire resources and fill host */ 160 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); 161 162 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000); 163 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000); 164 165 if (!data->cs0 || !data->cs1) 166 return -ENOMEM; 167 168 irq = platform_get_irq(pdev, 0); 169 if (irq) 170 set_irq_type(irq, IRQ_TYPE_EDGE_RISING); 171 172 /* Setup expansion bus chip selects */ 173 *data->cs0_cfg = data->cs0_bits; 174 *data->cs1_cfg = data->cs1_bits; 175 176 ap = host->ports[0]; 177 178 ap->ops = &ixp4xx_port_ops; 179 ap->pio_mask = ATA_PIO4; 180 ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI; 181 182 ixp4xx_setup_port(ap, data, cs0->start, cs1->start); 183 184 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n"); 185 186 /* activate host */ 187 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht); 188} 189 190static __devexit int ixp4xx_pata_remove(struct platform_device *dev) 191{ 192 struct ata_host *host = platform_get_drvdata(dev); 193 194 ata_host_detach(host); 195 196 return 0; 197} 198 199static struct platform_driver ixp4xx_pata_platform_driver = { 200 .driver = { 201 .name = DRV_NAME, 202 .owner = THIS_MODULE, 203 }, 204 .probe = ixp4xx_pata_probe, 205 .remove = __devexit_p(ixp4xx_pata_remove), 206}; 207 208static int __init ixp4xx_pata_init(void) 209{ 210 return platform_driver_register(&ixp4xx_pata_platform_driver); 211} 212 213static void __exit ixp4xx_pata_exit(void) 214{ 215 platform_driver_unregister(&ixp4xx_pata_platform_driver); 216} 217 218MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 219MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 220MODULE_LICENSE("GPL"); 221MODULE_VERSION(DRV_VERSION); 222MODULE_ALIAS("platform:" DRV_NAME); 223 224module_init(ixp4xx_pata_init); 225module_exit(ixp4xx_pata_exit); 226