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 void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, 46 unsigned int buflen, int write_data) 47 { 48 unsigned int i; 49 unsigned int words = buflen >> 1; 50 u16 *buf16 = (u16 *) buf; 51 struct ata_port *ap = adev->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 (write_data) { 63 for (i = 0; i < words; i++) 64 writew(buf16[i], mmio); 65 } else { 66 for (i = 0; i < words; i++) 67 buf16[i] = readw(mmio); 68 } 69 70 /* Transfer trailing 1 byte, if any. */ 71 if (unlikely(buflen & 0x01)) { 72 u16 align_buf[1] = { 0 }; 73 unsigned char *trailing_buf = buf + buflen - 1; 74 75 if (write_data) { 76 memcpy(align_buf, trailing_buf, 1); 77 writew(align_buf[0], mmio); 78 } else { 79 align_buf[0] = readw(mmio); 80 memcpy(trailing_buf, align_buf, 1); 81 } 82 } 83 84 udelay(100); 85 *data->cs0_cfg |= 0x01; 86 } 87 88 static struct scsi_host_template ixp4xx_sht = { 89 .module = THIS_MODULE, 90 .name = DRV_NAME, 91 .ioctl = ata_scsi_ioctl, 92 .queuecommand = ata_scsi_queuecmd, 93 .can_queue = ATA_DEF_QUEUE, 94 .this_id = ATA_SHT_THIS_ID, 95 .sg_tablesize = LIBATA_MAX_PRD, 96 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 97 .emulated = ATA_SHT_EMULATED, 98 .use_clustering = ATA_SHT_USE_CLUSTERING, 99 .proc_name = DRV_NAME, 100 .dma_boundary = ATA_DMA_BOUNDARY, 101 .slave_configure = ata_scsi_slave_config, 102 .slave_destroy = ata_scsi_slave_destroy, 103 .bios_param = ata_std_bios_param, 104 }; 105 106 static struct ata_port_operations ixp4xx_port_ops = { 107 .set_mode = ixp4xx_set_mode, 108 .mode_filter = ata_pci_default_filter, 109 110 .tf_load = ata_tf_load, 111 .tf_read = ata_tf_read, 112 .exec_command = ata_exec_command, 113 .check_status = ata_check_status, 114 .dev_select = ata_std_dev_select, 115 116 .freeze = ata_bmdma_freeze, 117 .thaw = ata_bmdma_thaw, 118 .error_handler = ata_bmdma_error_handler, 119 .post_internal_cmd = ata_bmdma_post_internal_cmd, 120 121 .qc_prep = ata_qc_prep, 122 .qc_issue = ata_qc_issue_prot, 123 .data_xfer = ixp4xx_mmio_data_xfer, 124 .cable_detect = ata_cable_40wire, 125 126 .irq_handler = ata_interrupt, 127 .irq_clear = ata_bmdma_irq_clear, 128 .irq_on = ata_irq_on, 129 130 .port_start = ata_port_start, 131 }; 132 133 static void ixp4xx_setup_port(struct ata_ioports *ioaddr, 134 struct ixp4xx_pata_data *data) 135 { 136 ioaddr->cmd_addr = data->cs0; 137 ioaddr->altstatus_addr = data->cs1 + 0x06; 138 ioaddr->ctl_addr = data->cs1 + 0x06; 139 140 ata_std_ports(ioaddr); 141 142 #ifndef __ARMEB__ 143 144 /* adjust the addresses to handle the address swizzling of the 145 * ixp4xx in little endian mode. 146 */ 147 148 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 149 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 150 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 151 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 152 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 153 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 154 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 155 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 156 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 157 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 158 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 159 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 160 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 161 #endif 162 } 163 164 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev) 165 { 166 unsigned int irq; 167 struct resource *cs0, *cs1; 168 struct ata_host *host; 169 struct ata_port *ap; 170 struct ixp4xx_pata_data *data = pdev->dev.platform_data; 171 172 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 173 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 174 175 if (!cs0 || !cs1) 176 return -EINVAL; 177 178 /* allocate host */ 179 host = ata_host_alloc(&pdev->dev, 1); 180 if (!host) 181 return -ENOMEM; 182 183 /* acquire resources and fill host */ 184 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; 185 186 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000); 187 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000); 188 189 if (!data->cs0 || !data->cs1) 190 return -ENOMEM; 191 192 irq = platform_get_irq(pdev, 0); 193 if (irq) 194 set_irq_type(irq, IRQT_RISING); 195 196 /* Setup expansion bus chip selects */ 197 *data->cs0_cfg = data->cs0_bits; 198 *data->cs1_cfg = data->cs1_bits; 199 200 ap = host->ports[0]; 201 202 ap->ops = &ixp4xx_port_ops; 203 ap->pio_mask = 0x1f; /* PIO4 */ 204 ap->flags |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ATA_FLAG_NO_ATAPI; 205 206 ixp4xx_setup_port(&ap->ioaddr, data); 207 208 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n"); 209 210 /* activate host */ 211 return ata_host_activate(host, irq, ata_interrupt, 0, &ixp4xx_sht); 212 } 213 214 static __devexit int ixp4xx_pata_remove(struct platform_device *dev) 215 { 216 struct ata_host *host = platform_get_drvdata(dev); 217 218 ata_host_detach(host); 219 220 return 0; 221 } 222 223 static struct platform_driver ixp4xx_pata_platform_driver = { 224 .driver = { 225 .name = DRV_NAME, 226 .owner = THIS_MODULE, 227 }, 228 .probe = ixp4xx_pata_probe, 229 .remove = __devexit_p(ixp4xx_pata_remove), 230 }; 231 232 static int __init ixp4xx_pata_init(void) 233 { 234 return platform_driver_register(&ixp4xx_pata_platform_driver); 235 } 236 237 static void __exit ixp4xx_pata_exit(void) 238 { 239 platform_driver_unregister(&ixp4xx_pata_platform_driver); 240 } 241 242 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 243 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 244 MODULE_LICENSE("GPL"); 245 MODULE_VERSION(DRV_VERSION); 246 247 module_init(ixp4xx_pata_init); 248 module_exit(ixp4xx_pata_exit); 249