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/mfd/syscon.h> 17 #include <linux/module.h> 18 #include <linux/libata.h> 19 #include <linux/irq.h> 20 #include <linux/of.h> 21 #include <linux/platform_device.h> 22 #include <linux/regmap.h> 23 #include <scsi/scsi_host.h> 24 25 #define DRV_NAME "pata_ixp4xx_cf" 26 #define DRV_VERSION "1.0" 27 28 struct ixp4xx_pata { 29 struct ata_host *host; 30 struct regmap *rmap; 31 u32 cmd_csreg; 32 void __iomem *cmd; 33 void __iomem *ctl; 34 }; 35 36 #define IXP4XX_EXP_TIMING_STRIDE 0x04 37 /* The timings for the chipselect is in bits 29..16 */ 38 #define IXP4XX_EXP_T1_T5_MASK GENMASK(29, 16) 39 #define IXP4XX_EXP_PIO_0_8 0x0a470000 40 #define IXP4XX_EXP_PIO_1_8 0x06430000 41 #define IXP4XX_EXP_PIO_2_8 0x02410000 42 #define IXP4XX_EXP_PIO_3_8 0x00820000 43 #define IXP4XX_EXP_PIO_4_8 0x00400000 44 #define IXP4XX_EXP_PIO_0_16 0x29640000 45 #define IXP4XX_EXP_PIO_1_16 0x05030000 46 #define IXP4XX_EXP_PIO_2_16 0x00b20000 47 #define IXP4XX_EXP_PIO_3_16 0x00820000 48 #define IXP4XX_EXP_PIO_4_16 0x00400000 49 #define IXP4XX_EXP_BW_MASK (BIT(6)|BIT(0)) 50 #define IXP4XX_EXP_BYTE_RD16 BIT(6) /* Byte reads on half-word devices */ 51 #define IXP4XX_EXP_BYTE_EN BIT(0) /* Use 8bit data bus if set */ 52 53 static void ixp4xx_set_8bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode) 54 { 55 switch (pio_mode) { 56 case XFER_PIO_0: 57 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 58 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_8); 59 break; 60 case XFER_PIO_1: 61 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 62 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_8); 63 break; 64 case XFER_PIO_2: 65 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 66 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_8); 67 break; 68 case XFER_PIO_3: 69 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 70 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_8); 71 break; 72 case XFER_PIO_4: 73 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 74 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_8); 75 break; 76 default: 77 break; 78 } 79 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 80 IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16|IXP4XX_EXP_BYTE_EN); 81 } 82 83 static void ixp4xx_set_16bit_timing(struct ixp4xx_pata *ixpp, u8 pio_mode) 84 { 85 switch (pio_mode){ 86 case XFER_PIO_0: 87 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 88 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_0_16); 89 break; 90 case XFER_PIO_1: 91 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 92 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_1_16); 93 break; 94 case XFER_PIO_2: 95 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 96 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_2_16); 97 break; 98 case XFER_PIO_3: 99 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 100 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_3_16); 101 break; 102 case XFER_PIO_4: 103 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 104 IXP4XX_EXP_T1_T5_MASK, IXP4XX_EXP_PIO_4_16); 105 break; 106 default: 107 break; 108 } 109 regmap_update_bits(ixpp->rmap, ixpp->cmd_csreg, 110 IXP4XX_EXP_BW_MASK, IXP4XX_EXP_BYTE_RD16); 111 } 112 113 /* This sets up the timing on the chipselect CMD accordingly */ 114 static void ixp4xx_set_piomode(struct ata_port *ap, struct ata_device *adev) 115 { 116 struct ixp4xx_pata *ixpp = ap->host->private_data; 117 118 ata_dev_info(adev, "configured for PIO%d 8bit\n", 119 adev->pio_mode - XFER_PIO_0); 120 ixp4xx_set_8bit_timing(ixpp, adev->pio_mode); 121 } 122 123 124 static unsigned int ixp4xx_mmio_data_xfer(struct ata_queued_cmd *qc, 125 unsigned char *buf, unsigned int buflen, int rw) 126 { 127 unsigned int i; 128 unsigned int words = buflen >> 1; 129 u16 *buf16 = (u16 *) buf; 130 struct ata_device *adev = qc->dev; 131 struct ata_port *ap = qc->dev->link->ap; 132 void __iomem *mmio = ap->ioaddr.data_addr; 133 struct ixp4xx_pata *ixpp = ap->host->private_data; 134 unsigned long flags; 135 136 ata_dev_dbg(adev, "%s %d bytes\n", (rw == READ) ? "READ" : "WRITE", 137 buflen); 138 spin_lock_irqsave(ap->lock, flags); 139 140 /* set the expansion bus in 16bit mode and restore 141 * 8 bit mode after the transaction. 142 */ 143 ixp4xx_set_16bit_timing(ixpp, adev->pio_mode); 144 udelay(5); 145 146 /* Transfer multiple of 2 bytes */ 147 if (rw == READ) 148 for (i = 0; i < words; i++) 149 buf16[i] = readw(mmio); 150 else 151 for (i = 0; i < words; i++) 152 writew(buf16[i], mmio); 153 154 /* Transfer trailing 1 byte, if any. */ 155 if (unlikely(buflen & 0x01)) { 156 u16 align_buf[1] = { 0 }; 157 unsigned char *trailing_buf = buf + buflen - 1; 158 159 if (rw == READ) { 160 align_buf[0] = readw(mmio); 161 memcpy(trailing_buf, align_buf, 1); 162 } else { 163 memcpy(align_buf, trailing_buf, 1); 164 writew(align_buf[0], mmio); 165 } 166 words++; 167 } 168 169 ixp4xx_set_8bit_timing(ixpp, adev->pio_mode); 170 udelay(5); 171 172 spin_unlock_irqrestore(ap->lock, flags); 173 174 return words << 1; 175 } 176 177 static const struct scsi_host_template ixp4xx_sht = { 178 ATA_PIO_SHT(DRV_NAME), 179 }; 180 181 static struct ata_port_operations ixp4xx_port_ops = { 182 .inherits = &ata_sff_port_ops, 183 .sff_data_xfer = ixp4xx_mmio_data_xfer, 184 .cable_detect = ata_cable_40wire, 185 .set_piomode = ixp4xx_set_piomode, 186 }; 187 188 static struct ata_port_info ixp4xx_port_info = { 189 .flags = ATA_FLAG_NO_ATAPI, 190 .pio_mask = ATA_PIO4, 191 .port_ops = &ixp4xx_port_ops, 192 }; 193 194 static void ixp4xx_setup_port(struct ata_port *ap, 195 struct ixp4xx_pata *ixpp, 196 unsigned long raw_cmd, unsigned long raw_ctl) 197 { 198 struct ata_ioports *ioaddr = &ap->ioaddr; 199 200 raw_ctl += 0x06; 201 ioaddr->cmd_addr = ixpp->cmd; 202 ioaddr->altstatus_addr = ixpp->ctl + 0x06; 203 ioaddr->ctl_addr = ixpp->ctl + 0x06; 204 205 ata_sff_std_ports(ioaddr); 206 207 if (!IS_ENABLED(CONFIG_CPU_BIG_ENDIAN)) { 208 /* adjust the addresses to handle the address swizzling of the 209 * ixp4xx in little endian mode. 210 */ 211 212 *(unsigned long *)&ioaddr->data_addr ^= 0x02; 213 *(unsigned long *)&ioaddr->cmd_addr ^= 0x03; 214 *(unsigned long *)&ioaddr->altstatus_addr ^= 0x03; 215 *(unsigned long *)&ioaddr->ctl_addr ^= 0x03; 216 *(unsigned long *)&ioaddr->error_addr ^= 0x03; 217 *(unsigned long *)&ioaddr->feature_addr ^= 0x03; 218 *(unsigned long *)&ioaddr->nsect_addr ^= 0x03; 219 *(unsigned long *)&ioaddr->lbal_addr ^= 0x03; 220 *(unsigned long *)&ioaddr->lbam_addr ^= 0x03; 221 *(unsigned long *)&ioaddr->lbah_addr ^= 0x03; 222 *(unsigned long *)&ioaddr->device_addr ^= 0x03; 223 *(unsigned long *)&ioaddr->status_addr ^= 0x03; 224 *(unsigned long *)&ioaddr->command_addr ^= 0x03; 225 226 raw_cmd ^= 0x03; 227 raw_ctl ^= 0x03; 228 } 229 230 ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd, raw_ctl); 231 } 232 233 static int ixp4xx_pata_probe(struct platform_device *pdev) 234 { 235 struct resource *cmd, *ctl; 236 struct ata_port_info pi = ixp4xx_port_info; 237 const struct ata_port_info *ppi[] = { &pi, NULL }; 238 struct device *dev = &pdev->dev; 239 struct device_node *np = dev->of_node; 240 struct ixp4xx_pata *ixpp; 241 u32 csindex; 242 int ret; 243 int irq; 244 245 ixpp = devm_kzalloc(dev, sizeof(*ixpp), GFP_KERNEL); 246 if (!ixpp) 247 return -ENOMEM; 248 249 ixpp->rmap = syscon_node_to_regmap(np->parent); 250 if (IS_ERR(ixpp->rmap)) 251 return dev_err_probe(dev, PTR_ERR(ixpp->rmap), "no regmap\n"); 252 /* Inspect our address to figure out what chipselect the CMD is on */ 253 ret = of_property_read_u32_index(np, "reg", 0, &csindex); 254 if (ret) 255 return dev_err_probe(dev, ret, "can't inspect CMD address\n"); 256 dev_info(dev, "using CS%d for PIO timing configuration\n", csindex); 257 ixpp->cmd_csreg = csindex * IXP4XX_EXP_TIMING_STRIDE; 258 259 ixpp->host = ata_host_alloc_pinfo(dev, ppi, 1); 260 if (!ixpp->host) 261 return -ENOMEM; 262 ixpp->host->private_data = ixpp; 263 264 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); 265 if (ret) 266 return ret; 267 268 ixpp->cmd = devm_platform_get_and_ioremap_resource(pdev, 0, &cmd); 269 if (IS_ERR(ixpp->cmd)) 270 return PTR_ERR(ixpp->cmd); 271 272 ixpp->ctl = devm_platform_get_and_ioremap_resource(pdev, 1, &ctl); 273 if (IS_ERR(ixpp->ctl)) 274 return PTR_ERR(ixpp->ctl); 275 276 irq = platform_get_irq(pdev, 0); 277 if (irq < 0) 278 return irq; 279 irq_set_irq_type(irq, IRQ_TYPE_EDGE_RISING); 280 281 /* Just one port to set up */ 282 ixp4xx_setup_port(ixpp->host->ports[0], ixpp, cmd->start, ctl->start); 283 284 ata_print_version_once(dev, DRV_VERSION); 285 286 return ata_host_activate(ixpp->host, irq, ata_sff_interrupt, 0, &ixp4xx_sht); 287 } 288 289 static const struct of_device_id ixp4xx_pata_of_match[] = { 290 { .compatible = "intel,ixp4xx-compact-flash", }, 291 { /* sentinel */ } 292 }; 293 294 static struct platform_driver ixp4xx_pata_platform_driver = { 295 .driver = { 296 .name = DRV_NAME, 297 .of_match_table = ixp4xx_pata_of_match, 298 }, 299 .probe = ixp4xx_pata_probe, 300 .remove_new = ata_platform_remove_one, 301 }; 302 303 module_platform_driver(ixp4xx_pata_platform_driver); 304 305 MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); 306 MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); 307 MODULE_LICENSE("GPL"); 308 MODULE_VERSION(DRV_VERSION); 309 MODULE_ALIAS("platform:" DRV_NAME); 310