1 | /* |
2 | * Generic platform device PATA driver |
3 | * |
4 | * Copyright (C) 2006 - 2007 Paul Mundt |
5 | * |
6 | * Based on pata_pcmcia: |
7 | * |
8 | * Copyright 2005-2006 Red Hat Inc, all rights reserved. |
9 | * |
10 | * This file is subject to the terms and conditions of the GNU General Public |
11 | * License. See the file "COPYING" in the main directory of this archive |
12 | * for more details. |
13 | */ |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/blkdev.h> |
17 | #include <scsi/scsi_host.h> |
18 | #include <linux/ata.h> |
19 | #include <linux/libata.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/ata_platform.h> |
22 | |
23 | #define DRV_NAME "pata_platform" |
24 | #define DRV_VERSION "1.2" |
25 | |
26 | static int pio_mask = 1; |
27 | module_param(pio_mask, int, 0); |
28 | MODULE_PARM_DESC(pio_mask, "PIO modes supported, mode 0 only by default" ); |
29 | |
30 | /* |
31 | * Provide our own set_mode() as we don't want to change anything that has |
32 | * already been configured.. |
33 | */ |
34 | static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused) |
35 | { |
36 | struct ata_device *dev; |
37 | |
38 | ata_for_each_dev(dev, link, ENABLED) { |
39 | /* We don't really care */ |
40 | dev->pio_mode = dev->xfer_mode = XFER_PIO_0; |
41 | dev->xfer_shift = ATA_SHIFT_PIO; |
42 | dev->flags |= ATA_DFLAG_PIO; |
43 | ata_dev_info(dev, "configured for PIO\n" ); |
44 | } |
45 | return 0; |
46 | } |
47 | |
48 | static const struct scsi_host_template pata_platform_sht = { |
49 | ATA_PIO_SHT(DRV_NAME), |
50 | }; |
51 | |
52 | static void pata_platform_setup_port(struct ata_ioports *ioaddr, |
53 | unsigned int shift) |
54 | { |
55 | /* Fixup the port shift for platforms that need it */ |
56 | ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift); |
57 | ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift); |
58 | ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift); |
59 | ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift); |
60 | ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift); |
61 | ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift); |
62 | ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift); |
63 | ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift); |
64 | ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift); |
65 | ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift); |
66 | } |
67 | |
68 | /** |
69 | * __pata_platform_probe - attach a platform interface |
70 | * @dev: device |
71 | * @io_res: Resource representing I/O base |
72 | * @ctl_res: Resource representing CTL base |
73 | * @irq_res: Resource representing IRQ and its flags |
74 | * @ioport_shift: I/O port shift |
75 | * @__pio_mask: PIO mask |
76 | * @sht: scsi_host_template to use when registering |
77 | * @use16bit: Flag to indicate 16-bit IO instead of 32-bit |
78 | * |
79 | * Register a platform bus IDE interface. Such interfaces are PIO and we |
80 | * assume do not support IRQ sharing. |
81 | * |
82 | * Platform devices are expected to contain at least 2 resources per port: |
83 | * |
84 | * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM) |
85 | * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM) |
86 | * |
87 | * and optionally: |
88 | * |
89 | * - IRQ (IORESOURCE_IRQ) |
90 | * |
91 | * If the base resources are both mem types, the ioremap() is handled |
92 | * here. For IORESOURCE_IO, it's assumed that there's no remapping |
93 | * necessary. |
94 | * |
95 | * If no IRQ resource is present, PIO polling mode is used instead. |
96 | */ |
97 | int __pata_platform_probe(struct device *dev, struct resource *io_res, |
98 | struct resource *ctl_res, struct resource *irq_res, |
99 | unsigned int ioport_shift, int __pio_mask, |
100 | const struct scsi_host_template *sht, bool use16bit) |
101 | { |
102 | struct ata_host *host; |
103 | struct ata_port *ap; |
104 | unsigned int mmio; |
105 | int irq = 0; |
106 | int irq_flags = 0; |
107 | |
108 | /* |
109 | * Check for MMIO |
110 | */ |
111 | mmio = (( io_res->flags == IORESOURCE_MEM) && |
112 | (ctl_res->flags == IORESOURCE_MEM)); |
113 | |
114 | /* |
115 | * And the IRQ |
116 | */ |
117 | if (irq_res && irq_res->start > 0) { |
118 | irq = irq_res->start; |
119 | irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED; |
120 | } |
121 | |
122 | /* |
123 | * Now that that's out of the way, wire up the port.. |
124 | */ |
125 | host = ata_host_alloc(dev, max_ports: 1); |
126 | if (!host) |
127 | return -ENOMEM; |
128 | ap = host->ports[0]; |
129 | |
130 | ap->ops = devm_kzalloc(dev, size: sizeof(*ap->ops), GFP_KERNEL); |
131 | if (!ap->ops) |
132 | return -ENOMEM; |
133 | ap->ops->inherits = &ata_sff_port_ops; |
134 | ap->ops->cable_detect = ata_cable_unknown; |
135 | ap->ops->set_mode = pata_platform_set_mode; |
136 | if (use16bit) |
137 | ap->ops->sff_data_xfer = ata_sff_data_xfer; |
138 | else |
139 | ap->ops->sff_data_xfer = ata_sff_data_xfer32; |
140 | |
141 | ap->pio_mask = __pio_mask; |
142 | ap->flags |= ATA_FLAG_SLAVE_POSS; |
143 | |
144 | /* |
145 | * Use polling mode if there's no IRQ |
146 | */ |
147 | if (!irq) { |
148 | ap->flags |= ATA_FLAG_PIO_POLLING; |
149 | ata_port_desc(ap, fmt: "no IRQ, using PIO polling" ); |
150 | } |
151 | |
152 | /* |
153 | * Handle the MMIO case |
154 | */ |
155 | if (mmio) { |
156 | ap->ioaddr.cmd_addr = devm_ioremap(dev, offset: io_res->start, |
157 | size: resource_size(res: io_res)); |
158 | ap->ioaddr.ctl_addr = devm_ioremap(dev, offset: ctl_res->start, |
159 | size: resource_size(res: ctl_res)); |
160 | } else { |
161 | ap->ioaddr.cmd_addr = devm_ioport_map(dev, port: io_res->start, |
162 | nr: resource_size(res: io_res)); |
163 | ap->ioaddr.ctl_addr = devm_ioport_map(dev, port: ctl_res->start, |
164 | nr: resource_size(res: ctl_res)); |
165 | } |
166 | if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) { |
167 | dev_err(dev, "failed to map IO/CTL base\n" ); |
168 | return -ENOMEM; |
169 | } |
170 | |
171 | ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr; |
172 | |
173 | pata_platform_setup_port(ioaddr: &ap->ioaddr, shift: ioport_shift); |
174 | |
175 | ata_port_desc(ap, fmt: "%s cmd 0x%llx ctl 0x%llx" , mmio ? "mmio" : "ioport" , |
176 | (unsigned long long)io_res->start, |
177 | (unsigned long long)ctl_res->start); |
178 | |
179 | /* activate */ |
180 | return ata_host_activate(host, irq, irq_handler: irq ? ata_sff_interrupt : NULL, |
181 | irq_flags, sht); |
182 | } |
183 | EXPORT_SYMBOL_GPL(__pata_platform_probe); |
184 | |
185 | static int pata_platform_probe(struct platform_device *pdev) |
186 | { |
187 | struct resource *io_res; |
188 | struct resource *ctl_res; |
189 | struct resource *irq_res; |
190 | struct pata_platform_info *pp_info = dev_get_platdata(dev: &pdev->dev); |
191 | |
192 | /* |
193 | * Simple resource validation .. |
194 | */ |
195 | if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) { |
196 | dev_err(&pdev->dev, "invalid number of resources\n" ); |
197 | return -EINVAL; |
198 | } |
199 | |
200 | /* |
201 | * Get the I/O base first |
202 | */ |
203 | io_res = platform_get_mem_or_io(pdev, 0); |
204 | if (!io_res) |
205 | return -EINVAL; |
206 | |
207 | /* |
208 | * Then the CTL base |
209 | */ |
210 | ctl_res = platform_get_mem_or_io(pdev, 1); |
211 | if (!ctl_res) |
212 | return -EINVAL; |
213 | |
214 | /* |
215 | * And the IRQ |
216 | */ |
217 | irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
218 | |
219 | return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res, |
220 | pp_info ? pp_info->ioport_shift : 0, |
221 | pio_mask, &pata_platform_sht, false); |
222 | } |
223 | |
224 | static struct platform_driver pata_platform_driver = { |
225 | .probe = pata_platform_probe, |
226 | .remove_new = ata_platform_remove_one, |
227 | .driver = { |
228 | .name = DRV_NAME, |
229 | }, |
230 | }; |
231 | |
232 | module_platform_driver(pata_platform_driver); |
233 | |
234 | MODULE_AUTHOR("Paul Mundt" ); |
235 | MODULE_DESCRIPTION("low-level driver for platform device ATA" ); |
236 | MODULE_LICENSE("GPL" ); |
237 | MODULE_VERSION(DRV_VERSION); |
238 | MODULE_ALIAS("platform:" DRV_NAME); |
239 | |