diff options
Diffstat (limited to 'drivers/ata/pata_ixp4xx_cf.c')
-rw-r--r-- | drivers/ata/pata_ixp4xx_cf.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/drivers/ata/pata_ixp4xx_cf.c b/drivers/ata/pata_ixp4xx_cf.c new file mode 100644 index 000000000000..d2268bfe6f55 --- /dev/null +++ b/drivers/ata/pata_ixp4xx_cf.c | |||
@@ -0,0 +1,271 @@ | |||
1 | /* | ||
2 | * ixp4xx PATA/Compact Flash driver | ||
3 | * Copyright (c) 2006 Tower Technologies | ||
4 | * Author: Alessandro Zummo <a.zummo@towertech.it> | ||
5 | * | ||
6 | * An ATA driver to handle a Compact Flash connected | ||
7 | * to the ixp4xx expansion bus in TrueIDE mode. The CF | ||
8 | * must have it chip selects connected to two CS lines | ||
9 | * on the ixp4xx. The interrupt line is optional, if not | ||
10 | * specified the driver will run in polling mode. | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or modify | ||
13 | * it under the terms of the GNU General Public License version 2 as | ||
14 | * published by the Free Software Foundation. | ||
15 | * | ||
16 | */ | ||
17 | |||
18 | #include <linux/kernel.h> | ||
19 | #include <linux/module.h> | ||
20 | #include <linux/libata.h> | ||
21 | #include <linux/irq.h> | ||
22 | #include <linux/platform_device.h> | ||
23 | #include <scsi/scsi_host.h> | ||
24 | |||
25 | #define DRV_NAME "pata_ixp4xx_cf" | ||
26 | #define DRV_VERSION "0.1.1" | ||
27 | |||
28 | static void ixp4xx_set_mode(struct ata_port *ap) | ||
29 | { | ||
30 | int i; | ||
31 | |||
32 | for (i = 0; i < ATA_MAX_DEVICES; i++) { | ||
33 | struct ata_device *dev = &ap->device[i]; | ||
34 | if (ata_dev_enabled(dev)) { | ||
35 | dev->pio_mode = XFER_PIO_0; | ||
36 | dev->xfer_mode = XFER_PIO_0; | ||
37 | dev->xfer_shift = ATA_SHIFT_PIO; | ||
38 | dev->flags |= ATA_DFLAG_PIO; | ||
39 | } | ||
40 | } | ||
41 | } | ||
42 | |||
43 | static void ixp4xx_phy_reset(struct ata_port *ap) | ||
44 | { | ||
45 | ap->cbl = ATA_CBL_PATA40; | ||
46 | ata_port_probe(ap); | ||
47 | ata_bus_reset(ap); | ||
48 | } | ||
49 | |||
50 | static void ixp4xx_mmio_data_xfer(struct ata_device *adev, unsigned char *buf, | ||
51 | unsigned int buflen, int write_data) | ||
52 | { | ||
53 | unsigned int i; | ||
54 | unsigned int words = buflen >> 1; | ||
55 | u16 *buf16 = (u16 *) buf; | ||
56 | struct ata_port *ap = adev->ap; | ||
57 | void __iomem *mmio = (void __iomem *)ap->ioaddr.data_addr; | ||
58 | struct ixp4xx_pata_data *data = ap->host->dev->platform_data; | ||
59 | |||
60 | /* set the expansion bus in 16bit mode and restore | ||
61 | * 8 bit mode after the transaction. | ||
62 | */ | ||
63 | *data->cs0_cfg &= ~(0x01); | ||
64 | udelay(100); | ||
65 | |||
66 | /* Transfer multiple of 2 bytes */ | ||
67 | if (write_data) { | ||
68 | for (i = 0; i < words; i++) | ||
69 | writew(buf16[i], mmio); | ||
70 | } else { | ||
71 | for (i = 0; i < words; i++) | ||
72 | buf16[i] = readw(mmio); | ||
73 | } | ||
74 | |||
75 | /* Transfer trailing 1 byte, if any. */ | ||
76 | if (unlikely(buflen & 0x01)) { | ||
77 | u16 align_buf[1] = { 0 }; | ||
78 | unsigned char *trailing_buf = buf + buflen - 1; | ||
79 | |||
80 | if (write_data) { | ||
81 | memcpy(align_buf, trailing_buf, 1); | ||
82 | writew(align_buf[0], mmio); | ||
83 | } else { | ||
84 | align_buf[0] = readw(mmio); | ||
85 | memcpy(trailing_buf, align_buf, 1); | ||
86 | } | ||
87 | } | ||
88 | |||
89 | udelay(100); | ||
90 | *data->cs0_cfg |= 0x01; | ||
91 | } | ||
92 | |||
93 | static void ixp4xx_irq_clear(struct ata_port *ap) | ||
94 | { | ||
95 | } | ||
96 | |||
97 | static void ixp4xx_host_stop (struct ata_host *host) | ||
98 | { | ||
99 | struct ixp4xx_pata_data *data = host->dev->platform_data; | ||
100 | |||
101 | iounmap(data->cs0); | ||
102 | iounmap(data->cs1); | ||
103 | } | ||
104 | |||
105 | static struct scsi_host_template ixp4xx_sht = { | ||
106 | .module = THIS_MODULE, | ||
107 | .name = DRV_NAME, | ||
108 | .ioctl = ata_scsi_ioctl, | ||
109 | .queuecommand = ata_scsi_queuecmd, | ||
110 | .can_queue = ATA_DEF_QUEUE, | ||
111 | .this_id = ATA_SHT_THIS_ID, | ||
112 | .sg_tablesize = LIBATA_MAX_PRD, | ||
113 | .max_sectors = ATA_MAX_SECTORS, | ||
114 | .cmd_per_lun = ATA_SHT_CMD_PER_LUN, | ||
115 | .emulated = ATA_SHT_EMULATED, | ||
116 | .use_clustering = ATA_SHT_USE_CLUSTERING, | ||
117 | .proc_name = DRV_NAME, | ||
118 | .dma_boundary = ATA_DMA_BOUNDARY, | ||
119 | .slave_configure = ata_scsi_slave_config, | ||
120 | .bios_param = ata_std_bios_param, | ||
121 | }; | ||
122 | |||
123 | static struct ata_port_operations ixp4xx_port_ops = { | ||
124 | .set_mode = ixp4xx_set_mode, | ||
125 | .mode_filter = ata_pci_default_filter, | ||
126 | |||
127 | .port_disable = ata_port_disable, | ||
128 | .tf_load = ata_tf_load, | ||
129 | .tf_read = ata_tf_read, | ||
130 | .check_status = ata_check_status, | ||
131 | .exec_command = ata_exec_command, | ||
132 | .dev_select = ata_std_dev_select, | ||
133 | |||
134 | .qc_prep = ata_qc_prep, | ||
135 | .qc_issue = ata_qc_issue_prot, | ||
136 | .eng_timeout = ata_eng_timeout, | ||
137 | .data_xfer = ixp4xx_mmio_data_xfer, | ||
138 | |||
139 | .irq_handler = ata_interrupt, | ||
140 | .irq_clear = ixp4xx_irq_clear, | ||
141 | |||
142 | .port_start = ata_port_start, | ||
143 | .port_stop = ata_port_stop, | ||
144 | .host_stop = ixp4xx_host_stop, | ||
145 | |||
146 | .phy_reset = ixp4xx_phy_reset, | ||
147 | }; | ||
148 | |||
149 | static void ixp4xx_setup_port(struct ata_ioports *ioaddr, | ||
150 | struct ixp4xx_pata_data *data) | ||
151 | { | ||
152 | ioaddr->cmd_addr = (unsigned long) data->cs0; | ||
153 | ioaddr->altstatus_addr = (unsigned long) data->cs1 + 0x06; | ||
154 | ioaddr->ctl_addr = (unsigned long) data->cs1 + 0x06; | ||
155 | |||
156 | ata_std_ports(ioaddr); | ||
157 | |||
158 | #ifndef __ARMEB__ | ||
159 | |||
160 | /* adjust the addresses to handle the address swizzling of the | ||
161 | * ixp4xx in little endian mode. | ||
162 | */ | ||
163 | |||
164 | ioaddr->data_addr ^= 0x02; | ||
165 | ioaddr->cmd_addr ^= 0x03; | ||
166 | ioaddr->altstatus_addr ^= 0x03; | ||
167 | ioaddr->ctl_addr ^= 0x03; | ||
168 | ioaddr->error_addr ^= 0x03; | ||
169 | ioaddr->feature_addr ^= 0x03; | ||
170 | ioaddr->nsect_addr ^= 0x03; | ||
171 | ioaddr->lbal_addr ^= 0x03; | ||
172 | ioaddr->lbam_addr ^= 0x03; | ||
173 | ioaddr->lbah_addr ^= 0x03; | ||
174 | ioaddr->device_addr ^= 0x03; | ||
175 | ioaddr->status_addr ^= 0x03; | ||
176 | ioaddr->command_addr ^= 0x03; | ||
177 | #endif | ||
178 | } | ||
179 | |||
180 | static __devinit int ixp4xx_pata_probe(struct platform_device *pdev) | ||
181 | { | ||
182 | int ret; | ||
183 | unsigned int irq; | ||
184 | struct resource *cs0, *cs1; | ||
185 | struct ata_probe_ent ae; | ||
186 | |||
187 | struct ixp4xx_pata_data *data = pdev->dev.platform_data; | ||
188 | |||
189 | cs0 = platform_get_resource(pdev, IORESOURCE_MEM, 0); | ||
190 | cs1 = platform_get_resource(pdev, IORESOURCE_MEM, 1); | ||
191 | |||
192 | if (!cs0 || !cs1) | ||
193 | return -EINVAL; | ||
194 | |||
195 | pdev->dev.coherent_dma_mask = DMA_32BIT_MASK; | ||
196 | |||
197 | data->cs0 = ioremap(cs0->start, 0x1000); | ||
198 | data->cs1 = ioremap(cs1->start, 0x1000); | ||
199 | |||
200 | irq = platform_get_irq(pdev, 0); | ||
201 | if (irq) | ||
202 | set_irq_type(irq, IRQT_HIGH); | ||
203 | |||
204 | /* Setup expansion bus chip selects */ | ||
205 | *data->cs0_cfg = data->cs0_bits; | ||
206 | *data->cs1_cfg = data->cs1_bits; | ||
207 | |||
208 | memset(&ae, 0, sizeof(struct ata_probe_ent)); | ||
209 | INIT_LIST_HEAD(&ae.node); | ||
210 | |||
211 | ae.dev = &pdev->dev; | ||
212 | ae.port_ops = &ixp4xx_port_ops; | ||
213 | ae.sht = &ixp4xx_sht; | ||
214 | ae.n_ports = 1; | ||
215 | ae.pio_mask = 0x1f; /* PIO4 */ | ||
216 | ae.irq = irq; | ||
217 | ae.irq_flags = 0; | ||
218 | ae.port_flags = ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY | ||
219 | | ATA_FLAG_NO_ATAPI | ATA_FLAG_SRST; | ||
220 | |||
221 | /* run in polling mode if no irq has been assigned */ | ||
222 | if (!irq) | ||
223 | ae.port_flags |= ATA_FLAG_PIO_POLLING; | ||
224 | |||
225 | ixp4xx_setup_port(&ae.port[0], data); | ||
226 | |||
227 | dev_printk(KERN_INFO, &pdev->dev, "version " DRV_VERSION "\n"); | ||
228 | |||
229 | ret = ata_device_add(&ae); | ||
230 | if (ret == 0) | ||
231 | return -ENODEV; | ||
232 | |||
233 | return 0; | ||
234 | } | ||
235 | |||
236 | static __devexit int ixp4xx_pata_remove(struct platform_device *dev) | ||
237 | { | ||
238 | struct ata_host *host = platform_get_drvdata(dev); | ||
239 | |||
240 | ata_host_remove(host); | ||
241 | platform_set_drvdata(dev, NULL); | ||
242 | |||
243 | return 0; | ||
244 | } | ||
245 | |||
246 | static struct platform_driver ixp4xx_pata_platform_driver = { | ||
247 | .driver = { | ||
248 | .name = DRV_NAME, | ||
249 | .owner = THIS_MODULE, | ||
250 | }, | ||
251 | .probe = ixp4xx_pata_probe, | ||
252 | .remove = __devexit_p(ixp4xx_pata_remove), | ||
253 | }; | ||
254 | |||
255 | static int __init ixp4xx_pata_init(void) | ||
256 | { | ||
257 | return platform_driver_register(&ixp4xx_pata_platform_driver); | ||
258 | } | ||
259 | |||
260 | static void __exit ixp4xx_pata_exit(void) | ||
261 | { | ||
262 | platform_driver_unregister(&ixp4xx_pata_platform_driver); | ||
263 | } | ||
264 | |||
265 | MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>"); | ||
266 | MODULE_DESCRIPTION("low-level driver for ixp4xx Compact Flash PATA"); | ||
267 | MODULE_LICENSE("GPL"); | ||
268 | MODULE_VERSION(DRV_VERSION); | ||
269 | |||
270 | module_init(ixp4xx_pata_init); | ||
271 | module_exit(ixp4xx_pata_exit); | ||