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1da177e4 LT |
1 | /* |
2 | * IDE tuning and bus mastering support for the CS5510/CS5520 | |
3 | * chipsets | |
4 | * | |
5 | * The CS5510/CS5520 are slightly unusual devices. Unlike the | |
6 | * typical IDE controllers they do bus mastering with the drive in | |
7 | * PIO mode and smarter silicon. | |
8 | * | |
9 | * The practical upshot of this is that we must always tune the | |
10 | * drive for the right PIO mode. We must also ignore all the blacklists | |
11 | * and the drive bus mastering DMA information. | |
12 | * | |
13 | * *** This driver is strictly experimental *** | |
14 | * | |
15 | * (c) Copyright Red Hat Inc 2002 | |
16 | * | |
17 | * This program is free software; you can redistribute it and/or modify it | |
18 | * under the terms of the GNU General Public License as published by the | |
19 | * Free Software Foundation; either version 2, or (at your option) any | |
20 | * later version. | |
21 | * | |
22 | * This program is distributed in the hope that it will be useful, but | |
23 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | * General Public License for more details. | |
26 | * | |
27 | * For the avoidance of doubt the "preferred form" of this code is one which | |
28 | * is in an open non patent encumbered format. Where cryptographic key signing | |
29 | * forms part of the process of creating an executable the information | |
30 | * including keys needed to generate an equivalently functional executable | |
31 | * are deemed to be part of the source code. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include <linux/config.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/types.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/delay.h> | |
40 | #include <linux/timer.h> | |
41 | #include <linux/mm.h> | |
42 | #include <linux/ioport.h> | |
43 | #include <linux/blkdev.h> | |
44 | #include <linux/hdreg.h> | |
45 | ||
46 | #include <linux/interrupt.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/pci.h> | |
49 | #include <linux/ide.h> | |
50 | #include <linux/dma-mapping.h> | |
51 | ||
52 | #include <asm/io.h> | |
53 | #include <asm/irq.h> | |
54 | ||
55 | struct pio_clocks | |
56 | { | |
57 | int address; | |
58 | int assert; | |
59 | int recovery; | |
60 | }; | |
61 | ||
62 | static struct pio_clocks cs5520_pio_clocks[]={ | |
63 | {3, 6, 11}, | |
64 | {2, 5, 6}, | |
65 | {1, 4, 3}, | |
66 | {1, 3, 2}, | |
67 | {1, 2, 1} | |
68 | }; | |
69 | ||
70 | static int cs5520_tune_chipset(ide_drive_t *drive, u8 xferspeed) | |
71 | { | |
72 | ide_hwif_t *hwif = HWIF(drive); | |
73 | struct pci_dev *pdev = hwif->pci_dev; | |
74 | u8 speed = min((u8)XFER_PIO_4, xferspeed); | |
75 | int pio = speed; | |
76 | u8 reg; | |
77 | int controller = drive->dn > 1 ? 1 : 0; | |
78 | int error; | |
79 | ||
80 | switch(speed) | |
81 | { | |
82 | case XFER_PIO_4: | |
83 | case XFER_PIO_3: | |
84 | case XFER_PIO_2: | |
85 | case XFER_PIO_1: | |
86 | case XFER_PIO_0: | |
87 | pio -= XFER_PIO_0; | |
88 | break; | |
89 | default: | |
90 | pio = 0; | |
91 | printk(KERN_ERR "cs55x0: bad ide timing.\n"); | |
92 | } | |
93 | ||
94 | printk("PIO clocking = %d\n", pio); | |
95 | ||
96 | /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */ | |
97 | ||
98 | /* 8bit CAT/CRT - 8bit command timing for channel */ | |
99 | pci_write_config_byte(pdev, 0x62 + controller, | |
100 | (cs5520_pio_clocks[pio].recovery << 4) | | |
101 | (cs5520_pio_clocks[pio].assert)); | |
102 | ||
103 | /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */ | |
104 | ||
105 | /* FIXME: should these use address ? */ | |
106 | /* Data read timing */ | |
107 | pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1), | |
108 | (cs5520_pio_clocks[pio].recovery << 4) | | |
109 | (cs5520_pio_clocks[pio].assert)); | |
110 | /* Write command timing */ | |
111 | pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1), | |
112 | (cs5520_pio_clocks[pio].recovery << 4) | | |
113 | (cs5520_pio_clocks[pio].assert)); | |
114 | ||
115 | /* Set the DMA enable/disable flag */ | |
116 | reg = inb(hwif->dma_base + 0x02 + 8*controller); | |
117 | reg |= 1<<((drive->dn&1)+5); | |
118 | outb(reg, hwif->dma_base + 0x02 + 8*controller); | |
119 | ||
120 | error = ide_config_drive_speed(drive, speed); | |
121 | /* ATAPI is harder so leave it for now */ | |
122 | if(!error && drive->media == ide_disk) | |
123 | error = hwif->ide_dma_on(drive); | |
124 | ||
125 | return error; | |
126 | } | |
127 | ||
128 | static void cs5520_tune_drive(ide_drive_t *drive, u8 pio) | |
129 | { | |
130 | pio = ide_get_best_pio_mode(drive, pio, 4, NULL); | |
131 | cs5520_tune_chipset(drive, (XFER_PIO_0 + pio)); | |
132 | } | |
133 | ||
134 | static int cs5520_config_drive_xfer_rate(ide_drive_t *drive) | |
135 | { | |
136 | ide_hwif_t *hwif = HWIF(drive); | |
137 | ||
138 | /* Tune the drive for PIO modes up to PIO 4 */ | |
139 | cs5520_tune_drive(drive, 4); | |
140 | /* Then tell the core to use DMA operations */ | |
141 | return hwif->ide_dma_on(drive); | |
142 | } | |
143 | ||
144 | /* | |
145 | * We provide a callback for our nonstandard DMA location | |
146 | */ | |
147 | ||
148 | static void __devinit cs5520_init_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif) | |
149 | { | |
150 | unsigned long bmide = pci_resource_start(dev, 2); /* Not the usual 4 */ | |
151 | if(hwif->mate && hwif->mate->dma_base) /* Second channel at primary + 8 */ | |
152 | bmide += 8; | |
153 | ide_setup_dma(hwif, bmide, 8); | |
154 | } | |
155 | ||
156 | /* | |
157 | * We wrap the DMA activate to set the vdma flag. This is needed | |
158 | * so that the IDE DMA layer issues PIO not DMA commands over the | |
159 | * DMA channel | |
160 | */ | |
161 | ||
162 | static int cs5520_dma_on(ide_drive_t *drive) | |
163 | { | |
164 | drive->vdma = 1; | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static void __devinit init_hwif_cs5520(ide_hwif_t *hwif) | |
169 | { | |
170 | hwif->tuneproc = &cs5520_tune_drive; | |
171 | hwif->speedproc = &cs5520_tune_chipset; | |
172 | hwif->ide_dma_check = &cs5520_config_drive_xfer_rate; | |
173 | hwif->ide_dma_on = &cs5520_dma_on; | |
174 | ||
175 | if(!noautodma) | |
176 | hwif->autodma = 1; | |
177 | ||
178 | if(!hwif->dma_base) | |
179 | { | |
180 | hwif->drives[0].autotune = 1; | |
181 | hwif->drives[1].autotune = 1; | |
182 | return; | |
183 | } | |
184 | ||
185 | hwif->atapi_dma = 0; | |
186 | hwif->ultra_mask = 0; | |
187 | hwif->swdma_mask = 0; | |
188 | hwif->mwdma_mask = 0; | |
189 | ||
190 | hwif->drives[0].autodma = hwif->autodma; | |
191 | hwif->drives[1].autodma = hwif->autodma; | |
192 | } | |
193 | ||
194 | #define DECLARE_CS_DEV(name_str) \ | |
195 | { \ | |
196 | .name = name_str, \ | |
197 | .init_setup_dma = cs5520_init_setup_dma, \ | |
198 | .init_hwif = init_hwif_cs5520, \ | |
199 | .channels = 2, \ | |
200 | .autodma = AUTODMA, \ | |
201 | .bootable = ON_BOARD, \ | |
202 | .flags = IDEPCI_FLAG_ISA_PORTS, \ | |
203 | } | |
204 | ||
205 | static ide_pci_device_t cyrix_chipsets[] __devinitdata = { | |
206 | /* 0 */ DECLARE_CS_DEV("Cyrix 5510"), | |
207 | /* 1 */ DECLARE_CS_DEV("Cyrix 5520") | |
208 | }; | |
209 | ||
210 | /* | |
211 | * The 5510/5520 are a bit weird. They don't quite set up the way | |
212 | * the PCI helper layer expects so we must do much of the set up | |
213 | * work longhand. | |
214 | */ | |
215 | ||
216 | static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id) | |
217 | { | |
218 | ata_index_t index; | |
219 | ide_pci_device_t *d = &cyrix_chipsets[id->driver_data]; | |
220 | ||
221 | ide_setup_pci_noise(dev, d); | |
222 | ||
223 | /* We must not grab the entire device, it has 'ISA' space in its | |
224 | BARS too and we will freak out other bits of the kernel */ | |
225 | if(pci_enable_device_bars(dev, 1<<2)) | |
226 | { | |
227 | printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name); | |
228 | return 1; | |
229 | } | |
230 | pci_set_master(dev); | |
231 | if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) { | |
232 | printk(KERN_WARNING "cs5520: No suitable DMA available.\n"); | |
233 | return -ENODEV; | |
234 | } | |
235 | ||
236 | index.all = 0xf0f0; | |
237 | ||
238 | /* | |
239 | * Now the chipset is configured we can let the core | |
240 | * do all the device setup for us | |
241 | */ | |
242 | ||
243 | ide_pci_setup_ports(dev, d, 14, &index); | |
244 | ||
245 | if((index.b.low & 0xf0) != 0xf0) | |
246 | probe_hwif_init(&ide_hwifs[index.b.low]); | |
247 | if((index.b.high & 0xf0) != 0xf0) | |
248 | probe_hwif_init(&ide_hwifs[index.b.high]); | |
249 | return 0; | |
250 | } | |
251 | ||
252 | static struct pci_device_id cs5520_pci_tbl[] = { | |
253 | { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, | |
254 | { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1}, | |
255 | { 0, }, | |
256 | }; | |
257 | MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl); | |
258 | ||
259 | static struct pci_driver driver = { | |
260 | .name = "Cyrix_IDE", | |
261 | .id_table = cs5520_pci_tbl, | |
262 | .probe = cs5520_init_one, | |
263 | }; | |
264 | ||
265 | static int cs5520_ide_init(void) | |
266 | { | |
267 | return ide_pci_register_driver(&driver); | |
268 | } | |
269 | ||
270 | module_init(cs5520_ide_init); | |
271 | ||
272 | MODULE_AUTHOR("Alan Cox"); | |
273 | MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE"); | |
274 | MODULE_LICENSE("GPL"); |