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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 | /* * Generic platform device PATA driver * * Copyright (C) 2006 - 2007 Paul Mundt * * Based on pata_pcmcia: * * Copyright 2005-2006 Red Hat Inc, all rights reserved. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/blkdev.h> #include <scsi/scsi_host.h> #include <linux/ata.h> #include <linux/libata.h> #include <linux/platform_device.h> #include <linux/ata_platform.h> #define DRV_NAME "pata_platform" #define DRV_VERSION "1.2" static int pio_mask = 1; module_param(pio_mask, int, 0); MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default"); /* * Provide our own set_mode() as we don't want to change anything that has * already been configured.. */ static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) { struct ata_device *dev; ata_for_each_dev(dev, link, ENABLED) { /* We don't really care */ dev->pio_mode = dev->xfer_mode = XFER_PIO_0; dev->xfer_shift = ATA_SHIFT_PIO; dev->flags |= ATA_DFLAG_PIO; ata_dev_info(dev, "configured for PIO\n"); } return 0; } static const struct scsi_host_template pata_platform_sht = { ATA_PIO_SHT(DRV_NAME), }; static void pata_platform_setup_port(struct ata_ioports *ioaddr, unsigned int shift) { /* Fixup the port shift for platforms that need it */ ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); } /** * __pata_platform_probe - attach a platform interface * @dev: device * @io_res: Resource representing I/O base * @ctl_res: Resource representing CTL base * @irq_res: Resource representing IRQ and its flags * @ioport_shift: I/O port shift * @__pio_mask: PIO mask * @sht: scsi_host_template to use when registering * @use16bit: Flag to indicate 16-bit IO instead of 32-bit * * Register a platform bus IDE interface. Such interfaces are PIO and we * assume do not support IRQ sharing. * * Platform devices are expected to contain at least 2 resources per port: * * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) * * and optionally: * * - IRQ (IORESOURCE_IRQ) * * If the base resources are both mem types, the ioremap() is handled * here. For IORESOURCE_IO, it's assumed that there's no remapping * necessary. * * If no IRQ resource is present, PIO polling mode is used instead. */ int __pata_platform_probe(struct device *dev, struct resource *io_res, struct resource *ctl_res, struct resource *irq_res, unsigned int ioport_shift, int __pio_mask, const struct scsi_host_template *sht, bool use16bit) { struct ata_host *host; struct ata_port *ap; unsigned int mmio; int irq = 0; int irq_flags = 0; /* * Check for MMIO */ mmio = (( io_res->flags == IORESOURCE_MEM) && (ctl_res->flags == IORESOURCE_MEM)); /* * And the IRQ */ if (irq_res && irq_res->start > 0) { irq = irq_res->start; irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; } /* * Now that that's out of the way, wire up the port.. */ host = ata_host_alloc(dev, 1); if (!host) return -ENOMEM; ap = host->ports[0]; ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL); if (!ap->ops) return -ENOMEM; ap->ops->inherits = &ata_sff_port_ops; ap->ops->cable_detect = ata_cable_unknown; ap->ops->set_mode = pata_platform_set_mode; if (use16bit) ap->ops->sff_data_xfer = ata_sff_data_xfer; else ap->ops->sff_data_xfer = ata_sff_data_xfer32; ap->pio_mask = __pio_mask; ap->flags |= ATA_FLAG_SLAVE_POSS; /* * Use polling mode if there's no IRQ */ if (!irq) { ap->flags |= ATA_FLAG_PIO_POLLING; ata_port_desc(ap, "no IRQ, using PIO polling"); } /* * Handle the MMIO case */ if (mmio) { ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start, resource_size(io_res)); ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start, resource_size(ctl_res)); } else { ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start, resource_size(io_res)); ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start, resource_size(ctl_res)); } if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { dev_err(dev, "failed to map IO/CTL base\n"); return -ENOMEM; } ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; pata_platform_setup_port(&ap->ioaddr, ioport_shift); ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport", (unsigned long long)io_res->start, (unsigned long long)ctl_res->start); /* activate */ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL, irq_flags, sht); } EXPORT_SYMBOL_GPL(__pata_platform_probe); static int pata_platform_probe(struct platform_device *pdev) { struct resource *io_res; struct resource *ctl_res; struct resource *irq_res; struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev); /* * Simple resource validation .. */ if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { dev_err(&pdev->dev, "invalid number of resources\n"); return -EINVAL; } /* * Get the I/O base first */ io_res = platform_get_mem_or_io(pdev, 0); if (!io_res) return -EINVAL; /* * Then the CTL base */ ctl_res = platform_get_mem_or_io(pdev, 1); if (!ctl_res) return -EINVAL; /* * And the IRQ */ irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, pp_info ? pp_info->ioport_shift : 0, pio_mask, &pata_platform_sht, false); } static struct platform_driver pata_platform_driver = { .probe = pata_platform_probe, .remove_new = ata_platform_remove_one, .driver = { .name = DRV_NAME, }, }; module_platform_driver(pata_platform_driver); MODULE_AUTHOR("Paul Mundt"); MODULE_DESCRIPTION("low-level driver for platform device ATA"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION); MODULE_ALIAS("platform:" DRV_NAME); |