1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ixp4xx PATA/Compact Flash driver 4 * Copyright (C) 2006-07 Tower Technologies 5 * Author: Alessandro Zummo <a.zummo@towertech.it> 6 * 7 * An ATA driver to handle a Compact Flash connected 8 * to the ixp4xx expansion bus in TrueIDE mode. The CF 9 * must have it chip selects connected to two CS lines 10 * on the ixp4xx. In the irq is not available, you might 11 * want to modify both this driver and libata to run in 12 * polling mode. 13 */ 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/libata.h> 18 #include <linux/irq.h> 19 #include <linux/platform_device.h> 20 #include <scsi/scsi_host.h> 21 22 #define DRV_NAME "pata_ixp4xx_cf" 23 #define DRV_VERSION "0.2" 24 25 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error) 26 { 27 struct ata_device *dev; 28 29 ata_for_each_dev(dev, link, ENABLED) { 30 ata_dev_info(dev, "configured for PIO0\n"); 31 dev->pio_mode = XFER_PIO_0; 32 dev->xfer_mode = XFER_PIO_0; 33 dev->xfer_shift = ATA_SHIFT_PIO; 34 dev->flags |= ATA_DFLAG_PIO; 35 } 36 return 0; 37 } 38 39 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc, 40 unsigned char *buf, unsigned int buflen, int rw) 41 { 42 unsigned int i; 43 unsigned int words = buflen >> 1; 44 u16 *buf16 = (u16 *) buf; 45 struct ata_port *ap = qc->dev->link->ap; 46 void __iomem *mmio = ap->ioaddr.data_addr; 47 struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev); 48 49 /* set the expansion bus in 16bit mode and restore 50 * 8 bit mode after the transaction. 51 */ 52 *data->cs0_cfg &= ~(0x01); 53 udelay(100); 54 55 /* Transfer multiple of 2 bytes */ 56 if (rw == READ) 57 for (i = 0; i < words; i++) 58 buf16[i] = readw(mmio); 59 else 60 for (i = 0; i < words; i++) 61 writew(buf16[i], mmio); 62 63 /* Transfer trailing 1 byte, if any. */ 64 if (unlikely(buflen & 0x01)) { 65 u16 align_buf[1] = { 0 }; 66 unsigned char *trailing_buf = buf + buflen - 1; 67 68 if (rw == READ) { 69 align_buf[0] = readw(mmio); 70 memcpy(trailing_buf, align_buf, 1); 71 } else { 72 memcpy(align_buf, trailing_buf, 1); 73 writew(align_buf[0], mmio); 74 } 75 words++; 76 } 77 78 udelay(100); 79 *data->cs0_cfg |= 0x01; 80 81 return words << 1; 82 } 83 84 static struct scsi_host_template ixp4xx_sht = { 85 ATA_PIO_SHT(DRV_NAME), 86 }; 87 88 static struct ata_port_operations ixp4xx_port_ops = { 89 .inherits = &ata_sff_port_ops, 90 .sff_data_xfer = ixp4xx_mmio_data_xfer, 91 .cable_detect = ata_cable_40wire, 92 .set_mode = ixp4xx_set_mode, 93 }; 94 95 static void ixp4xx_setup_port(struct ata_port *ap, 96 struct ixp4xx_pata_data *data, 97 unsigned long raw_cs0, unsigned long raw_cs1) 98 { 99 struct ata_ioports *ioaddr = &ap->ioaddr; 100 unsigned long raw_cmd = raw_cs0; 101 unsigned long raw_ctl = raw_cs1 + 0x06; 102 103 ioaddr->cmd_addr = data->cs0; 104 ioaddr->altstatus_addr = data->cs1 + 0x06; 105 ioaddr->ctl_addr = data->cs1 + 0x06; 106 107 ata_sff_std_ports(ioaddr); 108 109 #ifndef __ARMEB__ 110 111 /* adjust the addresses to handle the address swizzling of the 112 * ixp4xx in little endian mode. 113 */ 114 115 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 116 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 117 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 118 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 119 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 120 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 121 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 122 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 123 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 124 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 125 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 126 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 127 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 128 129 raw_cmd ^= 0x03; 130 raw_ctl ^= 0x03; 131 #endif 132 133 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl); 134 } 135 136 static int ixp4xx_pata_probe(struct platform_device *pdev) 137 { 138 unsigned int irq; 139 struct resource *cs0, *cs1; 140 struct ata_host *host; 141 struct ata_port *ap; 142 struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev); 143 int ret; 144 145 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 146 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 147 148 if (!cs0 || !cs1) 149 return -EINVAL; 150 151 /* allocate host */ 152 host = ata_host_alloc(&pdev->dev, 1); 153 if (!host) 154 return -ENOMEM; 155 156 /* acquire resources and fill host */ 157 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32)); 158 if (ret) 159 return ret; 160 161 data->cs0 = devm_ioremap(&pdev->dev, cs0->start, 0x1000); 162 data->cs1 = devm_ioremap(&pdev->dev, cs1->start, 0x1000); 163 164 if (!data->cs0 || !data->cs1) 165 return -ENOMEM; 166 167 irq = platform_get_irq(pdev, 0); 168 if (irq > 0) 169 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); 170 else if (irq < 0) 171 return irq; 172 else 173 return -EINVAL; 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 }, 197 .probe = ixp4xx_pata_probe, 198 .remove = ata_platform_remove_one, 199 }; 200 201 module_platform_driver(ixp4xx_pata_platform_driver); 202 203 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 204 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 205 MODULE_LICENSE("GPL"); 206 MODULE_VERSION(DRV_VERSION); 207 MODULE_ALIAS("platform:" DRV_NAME); 208