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 <linux/platform_data/pata_ixp4xx_cf.h> 21 #include <scsi/scsi_host.h> 22 23 #define DRV_NAME "pata_ixp4xx_cf" 24 #define DRV_VERSION "0.2" 25 26 static int ixp4xx_set_mode(struct ata_link *link, struct ata_device **error) 27 { 28 struct ata_device *dev; 29 30 ata_for_each_dev(dev, link, ENABLED) { 31 ata_dev_info(dev, "configured for PIO0\n"); 32 dev->pio_mode = XFER_PIO_0; 33 dev->xfer_mode = XFER_PIO_0; 34 dev->xfer_shift = ATA_SHIFT_PIO; 35 dev->flags |= ATA_DFLAG_PIO; 36 } 37 return 0; 38 } 39 40 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc, 41 unsigned char *buf, unsigned int buflen, int rw) 42 { 43 unsigned int i; 44 unsigned int words = buflen >> 1; 45 u16 *buf16 = (u16 *) buf; 46 struct ata_port *ap = qc->dev->link->ap; 47 void __iomem *mmio = ap->ioaddr.data_addr; 48 struct ixp4xx_pata_data *data = dev_get_platdata(ap->host->dev); 49 50 /* set the expansion bus in 16bit mode and restore 51 * 8 bit mode after the transaction. 52 */ 53 *data->cs0_cfg &= ~(0x01); 54 udelay(100); 55 56 /* Transfer multiple of 2 bytes */ 57 if (rw == READ) 58 for (i = 0; i < words; i++) 59 buf16[i] = readw(mmio); 60 else 61 for (i = 0; i < words; i++) 62 writew(buf16[i], mmio); 63 64 /* Transfer trailing 1 byte, if any. */ 65 if (unlikely(buflen & 0x01)) { 66 u16 align_buf[1] = { 0 }; 67 unsigned char *trailing_buf = buf + buflen - 1; 68 69 if (rw == READ) { 70 align_buf[0] = readw(mmio); 71 memcpy(trailing_buf, align_buf, 1); 72 } else { 73 memcpy(align_buf, trailing_buf, 1); 74 writew(align_buf[0], mmio); 75 } 76 words++; 77 } 78 79 udelay(100); 80 *data->cs0_cfg |= 0x01; 81 82 return words << 1; 83 } 84 85 static struct scsi_host_template ixp4xx_sht = { 86 ATA_PIO_SHT(DRV_NAME), 87 }; 88 89 static struct ata_port_operations ixp4xx_port_ops = { 90 .inherits = &ata_sff_port_ops, 91 .sff_data_xfer = ixp4xx_mmio_data_xfer, 92 .cable_detect = ata_cable_40wire, 93 .set_mode = ixp4xx_set_mode, 94 }; 95 96 static void ixp4xx_setup_port(struct ata_port *ap, 97 struct ixp4xx_pata_data *data, 98 unsigned long raw_cs0, unsigned long raw_cs1) 99 { 100 struct ata_ioports *ioaddr = &ap->ioaddr; 101 unsigned long raw_cmd = raw_cs0; 102 unsigned long raw_ctl = raw_cs1 + 0x06; 103 104 ioaddr->cmd_addr = data->cs0; 105 ioaddr->altstatus_addr = data->cs1 + 0x06; 106 ioaddr->ctl_addr = data->cs1 + 0x06; 107 108 ata_sff_std_ports(ioaddr); 109 110 #ifndef __ARMEB__ 111 112 /* adjust the addresses to handle the address swizzling of the 113 * ixp4xx in little endian mode. 114 */ 115 116 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 117 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 118 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 119 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 120 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 121 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 122 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 123 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 124 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 125 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 126 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 127 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 128 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 129 130 raw_cmd ^= 0x03; 131 raw_ctl ^= 0x03; 132 #endif 133 134 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl); 135 } 136 137 static int ixp4xx_pata_probe(struct platform_device *pdev) 138 { 139 struct resource *cs0, *cs1; 140 struct ata_host *host; 141 struct ata_port *ap; 142 struct device *dev = &pdev->dev; 143 struct ixp4xx_pata_data *data = dev_get_platdata(&pdev->dev); 144 int ret; 145 int irq; 146 147 cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); 148 cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); 149 150 if (!cs0 || !cs1) 151 return -EINVAL; 152 153 /* allocate host */ 154 host = ata_host_alloc(dev, 1); 155 if (!host) 156 return -ENOMEM; 157 158 /* acquire resources and fill host */ 159 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 160 if (ret) 161 return ret; 162 163 data->cs0 = devm_ioremap(dev, cs0->start, 0x1000); 164 data->cs1 = devm_ioremap(dev, cs1->start, 0x1000); 165 166 if (!data->cs0 || !data->cs1) 167 return -ENOMEM; 168 169 irq = platform_get_irq(pdev, 0); 170 if (irq > 0) 171 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); 172 else if (irq < 0) 173 return irq; 174 else 175 return -EINVAL; 176 177 /* Setup expansion bus chip selects */ 178 *data->cs0_cfg = data->cs0_bits; 179 *data->cs1_cfg = data->cs1_bits; 180 181 ap = host->ports[0]; 182 183 ap->ops = &ixp4xx_port_ops; 184 ap->pio_mask = ATA_PIO4; 185 ap->flags |= ATA_FLAG_NO_ATAPI; 186 187 ixp4xx_setup_port(ap, data, cs0->start, cs1->start); 188 189 ata_print_version_once(dev, DRV_VERSION); 190 191 /* activate host */ 192 return ata_host_activate(host, irq, ata_sff_interrupt, 0, &ixp4xx_sht); 193 } 194 195 static struct platform_driver ixp4xx_pata_platform_driver = { 196 .driver = { 197 .name = DRV_NAME, 198 }, 199 .probe = ixp4xx_pata_probe, 200 .remove = ata_platform_remove_one, 201 }; 202 203 module_platform_driver(ixp4xx_pata_platform_driver); 204 205 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 206 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 207 MODULE_LICENSE("GPL"); 208 MODULE_VERSION(DRV_VERSION); 209 MODULE_ALIAS("platform:" DRV_NAME); 210