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  */
pata_platform_set_mode(struct ata_link * link,struct ata_device ** unused)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 struct scsi_host_template pata_platform_sht = {
49 	ATA_PIO_SHT(DRV_NAME),
50 };
51 
pata_platform_setup_port(struct ata_ioports * ioaddr,unsigned int shift)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  */
__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,struct scsi_host_template * sht,bool use16bit)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 			  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, 1);
126 	if (!host)
127 		return -ENOMEM;
128 	ap = host->ports[0];
129 
130 	ap->ops = devm_kzalloc(dev, 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, "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, io_res->start,
157 				resource_size(io_res));
158 		ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
159 				resource_size(ctl_res));
160 	} else {
161 		ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
162 				resource_size(io_res));
163 		ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
164 				resource_size(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(&ap->ioaddr, ioport_shift);
174 
175 	ata_port_desc(ap, "%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 ? ata_sff_interrupt : NULL,
181 				 irq_flags, sht);
182 }
183 EXPORT_SYMBOL_GPL(__pata_platform_probe);
184 
pata_platform_probe(struct platform_device * pdev)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(&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		= 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