1 /* 2 * ixp4xx PATA/Compact Flash driver 3 * Copyright (c) 2006 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. The interrupt line is optional, if not 10 * specified the driver will run in polling mode. 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 * 16 */ 17 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/libata.h> 21 #include <linux/irq.h> 22 #include <linux/platform_device.h> 23 #include <scsi/scsi_host.h> 24 25 #define DRV_NAME "pata_ixp4xx_cf" 26 #define DRV_VERSION "0.1.2" 27 28 static int ixp4xx_set_mode(struct ata_port *ap, struct ata_device **error) 29 { 30 int i; 31 32 for (i = 0; i < ATA_MAX_DEVICES; i++) { 33 struct ata_device *dev = &ap->device[i]; 34 if (ata_dev_ready(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_phy_reset(struct ata_port *ap) 46 { 47 ap->cbl = ATA_CBL_PATA40; 48 ata_port_probe(ap); 49 ata_bus_reset(ap); 50 } 51 52 static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, 53 unsigned int buflen, int write_data) 54 { 55 unsigned int i; 56 unsigned int words = buflen >> 1; 57 u16 *buf16 = (u16 *) buf; 58 struct ata_port *ap = adev->ap; 59 void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr; 60 struct ixp4xx_pata_data *data = ap->host->dev->platform_data; 61 62 /* set the expansion bus in 16bit mode and restore 63 * 8 bit mode after the transaction. 64 */ 65 *data->cs0_cfg &= ~(0x01); 66 udelay(100); 67 68 /* Transfer multiple of 2 bytes */ 69 if (write_data) { 70 for (i = 0; i < words; i++) 71 writew(buf16[i], mmio); 72 } else { 73 for (i = 0; i < words; i++) 74 buf16[i] = readw(mmio); 75 } 76 77 /* Transfer trailing 1 byte, if any. */ 78 if (unlikely(buflen & 0x01)) { 79 u16 align_buf[1] = { 0 }; 80 unsigned char *trailing_buf = buf + buflen - 1; 81 82 if (write_data) { 83 memcpy(align_buf, trailing_buf, 1); 84 writew(align_buf[0], mmio); 85 } else { 86 align_buf[0] = readw(mmio); 87 memcpy(trailing_buf, align_buf, 1); 88 } 89 } 90 91 udelay(100); 92 *data->cs0_cfg |= 0x01; 93 } 94 95 static void ixp4xx_irq_clear(struct ata_port *ap) 96 { 97 } 98 99 static struct scsi_host_template ixp4xx_sht = { 100 .module = THIS_MODULE, 101 .name = DRV_NAME, 102 .ioctl = ata_scsi_ioctl, 103 .queuecommand = ata_scsi_queuecmd, 104 .can_queue = ATA_DEF_QUEUE, 105 .this_id = ATA_SHT_THIS_ID, 106 .sg_tablesize = LIBATA_MAX_PRD, 107 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 108 .emulated = ATA_SHT_EMULATED, 109 .use_clustering = ATA_SHT_USE_CLUSTERING, 110 .proc_name = DRV_NAME, 111 .dma_boundary = ATA_DMA_BOUNDARY, 112 .slave_configure = ata_scsi_slave_config, 113 .slave_destroy = ata_scsi_slave_destroy, 114 .bios_param = ata_std_bios_param, 115 }; 116 117 static struct ata_port_operations ixp4xx_port_ops = { 118 .set_mode = ixp4xx_set_mode, 119 .mode_filter = ata_pci_default_filter, 120 121 .port_disable = ata_port_disable, 122 .tf_load = ata_tf_load, 123 .tf_read = ata_tf_read, 124 .check_status = ata_check_status, 125 .exec_command = ata_exec_command, 126 .dev_select = ata_std_dev_select, 127 128 .qc_prep = ata_qc_prep, 129 .qc_issue = ata_qc_issue_prot, 130 .eng_timeout = ata_eng_timeout, 131 .data_xfer = ixp4xx_mmio_data_xfer, 132 133 .irq_handler = ata_interrupt, 134 .irq_clear = ixp4xx_irq_clear, 135 .irq_on = ata_irq_on, 136 .irq_ack = ata_irq_ack, 137 138 .port_start = ata_port_start, 139 140 .phy_reset = ixp4xx_phy_reset, 141 }; 142 143 static void ixp4xx_setup_port(struct ata_ioports *ioaddr, 144 struct ixp4xx_pata_data *data) 145 { 146 ioaddr->cmd_addr = data->cs0; 147 ioaddr->altstatus_addr = data->cs1 + 0x06; 148 ioaddr->ctl_addr = data->cs1 + 0x06; 149 150 ata_std_ports(ioaddr); 151 152 #ifndef __ARMEB__ 153 154 /* adjust the addresses to handle the address swizzling of the 155 * ixp4xx in little endian mode. 156 */ 157 158 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 159 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 160 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 161 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 162 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 163 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 164 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 165 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 166 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 167 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 168 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 169 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 170 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 171 #endif 172 } 173 174 static __devinit int ixp4xx_pata_probe(struct platform_device *pdev) 175 { 176 int ret; 177 unsigned int irq; 178 struct resource *cs0, *cs1; 179 struct ata_probe_ent ae; 180 181 struct ixp4xx_pata_data *data = pdev->dev.platform_data; 182 183 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 184 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 185 186 if (!cs0 || !cs1) 187 return -EINVAL; 188 189 pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; 190 191 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000); 192 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000); 193 194 irq = platform_get_irq(pdev, 0); 195 if (irq) 196 set_irq_type(irq, IRQT_HIGH); 197 198 /* Setup expansion bus chip selects */ 199 *data->cs0_cfg = data->cs0_bits; 200 *data->cs1_cfg = data->cs1_bits; 201 202 memset(&ae, 0, sizeof(struct ata_probe_ent)); 203 INIT_LIST_HEAD(&ae.node); 204 205 ae.dev = &pdev->dev; 206 ae.port_ops = &ixp4xx_port_ops; 207 ae.sht = &ixp4xx_sht; 208 ae.n_ports = 1; 209 ae.pio_mask = 0x1f; /* PIO4 */ 210 ae.irq = irq; 211 ae.irq_flags = 0; 212 ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY 213 | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST; 214 215 /* run in polling mode if no irq has been assigned */ 216 if (!irq) 217 ae.port_flags |= ATA_FLAG_PIO_POLLING; 218 219 ixp4xx_setup_port(&ae.port[0], data); 220 221 dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n"); 222 223 ret = ata_device_add(&ae); 224 if (ret == 0) 225 return -ENODEV; 226 227 return 0; 228 } 229 230 static __devexit int ixp4xx_pata_remove(struct platform_device *dev) 231 { 232 struct ata_host *host = platform_get_drvdata(dev); 233 234 ata_host_detach(host); 235 platform_set_drvdata(dev, NULL); 236 237 return 0; 238 } 239 240 static struct platform_driver ixp4xx_pata_platform_driver = { 241 .driver = { 242 .name = DRV_NAME, 243 .owner = THIS_MODULE, 244 }, 245 .probe = ixp4xx_pata_probe, 246 .remove = __devexit_p(ixp4xx_pata_remove), 247 }; 248 249 static int __init ixp4xx_pata_init(void) 250 { 251 return platform_driver_register(&ixp4xx_pata_platform_driver); 252 } 253 254 static void __exit ixp4xx_pata_exit(void) 255 { 256 platform_driver_unregister(&ixp4xx_pata_platform_driver); 257 } 258 259 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 260 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 261 MODULE_LICENSE("GPL"); 262 MODULE_VERSION(DRV_VERSION); 263 264 module_init(ixp4xx_pata_init); 265 module_exit(ixp4xx_pata_exit); 266