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a8fc0789 MR |
1 | /* |
2 | * linux/arch/arm/common/it8152.c | |
3 | * | |
4 | * Copyright Compulab Ltd, 2002-2007 | |
5 | * Mike Rapoport <mike@compulab.co.il> | |
6 | * | |
7 | * The DMA bouncing part is taken from arch/arm/mach-ixp4xx/common-pci.c | |
8 | * (see this file for respective copyrights) | |
9 | * | |
10 | * Thanks to Guennadi Liakhovetski <gl@dsa-ac.de> for IRQ enumberation | |
11 | * and demux code. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <linux/sched.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/pci.h> | |
21 | #include <linux/ptrace.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/ioport.h> | |
27 | #include <linux/irq.h> | |
28 | #include <linux/io.h> | |
29 | ||
30 | #include <asm/mach/pci.h> | |
31 | #include <asm/hardware/it8152.h> | |
32 | ||
33 | #define MAX_SLOTS 21 | |
34 | ||
35 | static void it8152_mask_irq(unsigned int irq) | |
36 | { | |
37 | if (irq >= IT8152_LD_IRQ(0)) { | |
38 | __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) | | |
39 | (1 << (irq - IT8152_LD_IRQ(0)))), | |
40 | IT8152_INTC_LDCNIMR); | |
41 | } else if (irq >= IT8152_LP_IRQ(0)) { | |
42 | __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) | | |
43 | (1 << (irq - IT8152_LP_IRQ(0)))), | |
44 | IT8152_INTC_LPCNIMR); | |
45 | } else if (irq >= IT8152_PD_IRQ(0)) { | |
46 | __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) | | |
47 | (1 << (irq - IT8152_PD_IRQ(0)))), | |
48 | IT8152_INTC_PDCNIMR); | |
49 | } | |
50 | } | |
51 | ||
52 | static void it8152_unmask_irq(unsigned int irq) | |
53 | { | |
54 | if (irq >= IT8152_LD_IRQ(0)) { | |
55 | __raw_writel((__raw_readl(IT8152_INTC_LDCNIMR) & | |
56 | ~(1 << (irq - IT8152_LD_IRQ(0)))), | |
57 | IT8152_INTC_LDCNIMR); | |
58 | } else if (irq >= IT8152_LP_IRQ(0)) { | |
59 | __raw_writel((__raw_readl(IT8152_INTC_LPCNIMR) & | |
60 | ~(1 << (irq - IT8152_LP_IRQ(0)))), | |
61 | IT8152_INTC_LPCNIMR); | |
62 | } else if (irq >= IT8152_PD_IRQ(0)) { | |
63 | __raw_writel((__raw_readl(IT8152_INTC_PDCNIMR) & | |
64 | ~(1 << (irq - IT8152_PD_IRQ(0)))), | |
65 | IT8152_INTC_PDCNIMR); | |
66 | } | |
67 | } | |
68 | ||
69 | static inline void it8152_irq(int irq) | |
70 | { | |
71 | struct irq_desc *desc; | |
72 | ||
a8fc0789 MR |
73 | desc = irq_desc + irq; |
74 | desc_handle_irq(irq, desc); | |
75 | } | |
76 | ||
77 | static struct irq_chip it8152_irq_chip = { | |
78 | .name = "it8152", | |
79 | .ack = it8152_mask_irq, | |
80 | .mask = it8152_mask_irq, | |
81 | .unmask = it8152_unmask_irq, | |
82 | }; | |
83 | ||
84 | void it8152_init_irq(void) | |
85 | { | |
86 | int irq; | |
87 | ||
88 | __raw_writel((0xffff), IT8152_INTC_PDCNIMR); | |
89 | __raw_writel((0), IT8152_INTC_PDCNIRR); | |
90 | __raw_writel((0xffff), IT8152_INTC_LPCNIMR); | |
91 | __raw_writel((0), IT8152_INTC_LPCNIRR); | |
92 | __raw_writel((0xffff), IT8152_INTC_LDCNIMR); | |
93 | __raw_writel((0), IT8152_INTC_LDCNIRR); | |
94 | ||
95 | for (irq = IT8152_IRQ(0); irq <= IT8152_LAST_IRQ; irq++) { | |
96 | set_irq_chip(irq, &it8152_irq_chip); | |
97 | set_irq_handler(irq, handle_level_irq); | |
98 | set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); | |
99 | } | |
100 | } | |
101 | ||
102 | void it8152_irq_demux(unsigned int irq, struct irq_desc *desc) | |
103 | { | |
104 | int bits_pd, bits_lp, bits_ld; | |
105 | int i; | |
106 | ||
a8fc0789 MR |
107 | while (1) { |
108 | /* Read all */ | |
109 | bits_pd = __raw_readl(IT8152_INTC_PDCNIRR); | |
110 | bits_lp = __raw_readl(IT8152_INTC_LPCNIRR); | |
111 | bits_ld = __raw_readl(IT8152_INTC_LDCNIRR); | |
112 | ||
113 | /* Ack */ | |
114 | __raw_writel((~bits_pd), IT8152_INTC_PDCNIRR); | |
115 | __raw_writel((~bits_lp), IT8152_INTC_LPCNIRR); | |
116 | __raw_writel((~bits_ld), IT8152_INTC_LDCNIRR); | |
117 | ||
118 | if (!(bits_ld | bits_lp | bits_pd)) { | |
119 | /* Re-read to guarantee, that there was a moment of | |
120 | time, when they all three were 0. */ | |
121 | bits_pd = __raw_readl(IT8152_INTC_PDCNIRR); | |
122 | bits_lp = __raw_readl(IT8152_INTC_LPCNIRR); | |
123 | if (!(bits_ld | bits_lp | bits_pd)) | |
124 | return; | |
125 | } | |
126 | ||
127 | bits_pd &= ((1 << IT8152_PD_IRQ_COUNT) - 1); | |
128 | while (bits_pd) { | |
129 | i = __ffs(bits_pd); | |
130 | it8152_irq(IT8152_PD_IRQ(i)); | |
131 | bits_pd &= ~(1 << i); | |
132 | } | |
133 | ||
134 | bits_lp &= ((1 << IT8152_LP_IRQ_COUNT) - 1); | |
135 | while (bits_lp) { | |
136 | i = __ffs(bits_pd); | |
137 | it8152_irq(IT8152_LP_IRQ(i)); | |
138 | bits_lp &= ~(1 << i); | |
139 | } | |
140 | ||
141 | bits_ld &= ((1 << IT8152_LD_IRQ_COUNT) - 1); | |
142 | while (bits_ld) { | |
143 | i = __ffs(bits_pd); | |
144 | it8152_irq(IT8152_LD_IRQ(i)); | |
145 | bits_ld &= ~(1 << i); | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | /* mapping for on-chip devices */ | |
151 | int __init it8152_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
152 | { | |
153 | if ((dev->vendor == PCI_VENDOR_ID_ITE) && | |
154 | (dev->device == PCI_DEVICE_ID_ITE_8152)) { | |
155 | if ((dev->class >> 8) == PCI_CLASS_MULTIMEDIA_AUDIO) | |
156 | return IT8152_AUDIO_INT; | |
157 | if ((dev->class >> 8) == PCI_CLASS_SERIAL_USB) | |
158 | return IT8152_USB_INT; | |
159 | if ((dev->class >> 8) == PCI_CLASS_SYSTEM_DMA) | |
160 | return IT8152_CDMA_INT; | |
161 | } | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
166 | static unsigned long it8152_pci_dev_base_address(struct pci_bus *bus, | |
167 | unsigned int devfn) | |
168 | { | |
169 | unsigned long addr = 0; | |
170 | ||
171 | if (bus->number == 0) { | |
172 | if (devfn < PCI_DEVFN(MAX_SLOTS, 0)) | |
173 | addr = (devfn << 8); | |
174 | } else | |
175 | addr = (bus->number << 16) | (devfn << 8); | |
176 | ||
177 | return addr; | |
178 | } | |
179 | ||
180 | static int it8152_pci_read_config(struct pci_bus *bus, | |
181 | unsigned int devfn, int where, | |
182 | int size, u32 *value) | |
183 | { | |
184 | unsigned long addr = it8152_pci_dev_base_address(bus, devfn); | |
185 | u32 v; | |
186 | int shift; | |
187 | ||
188 | shift = (where & 3); | |
189 | ||
190 | __raw_writel((addr + where), IT8152_PCI_CFG_ADDR); | |
191 | v = (__raw_readl(IT8152_PCI_CFG_DATA) >> (8 * (shift))); | |
192 | ||
193 | *value = v; | |
194 | ||
195 | return PCIBIOS_SUCCESSFUL; | |
196 | } | |
197 | ||
198 | static int it8152_pci_write_config(struct pci_bus *bus, | |
199 | unsigned int devfn, int where, | |
200 | int size, u32 value) | |
201 | { | |
202 | unsigned long addr = it8152_pci_dev_base_address(bus, devfn); | |
203 | u32 v, vtemp, mask = 0; | |
204 | int shift; | |
205 | ||
206 | if (size == 1) | |
207 | mask = 0xff; | |
208 | if (size == 2) | |
209 | mask = 0xffff; | |
210 | ||
211 | shift = (where & 3); | |
212 | ||
213 | __raw_writel((addr + where), IT8152_PCI_CFG_ADDR); | |
214 | vtemp = __raw_readl(IT8152_PCI_CFG_DATA); | |
215 | ||
216 | if (mask) | |
217 | vtemp &= ~(mask << (8 * shift)); | |
218 | else | |
219 | vtemp = 0; | |
220 | ||
221 | v = (value << (8 * shift)); | |
222 | __raw_writel((addr + where), IT8152_PCI_CFG_ADDR); | |
223 | __raw_writel((v | vtemp), IT8152_PCI_CFG_DATA); | |
224 | ||
225 | return PCIBIOS_SUCCESSFUL; | |
226 | } | |
227 | ||
228 | static struct pci_ops it8152_ops = { | |
229 | .read = it8152_pci_read_config, | |
230 | .write = it8152_pci_write_config, | |
231 | }; | |
232 | ||
233 | static struct resource it8152_io = { | |
234 | .name = "IT8152 PCI I/O region", | |
235 | .flags = IORESOURCE_IO, | |
236 | }; | |
237 | ||
238 | static struct resource it8152_mem = { | |
239 | .name = "IT8152 PCI memory region", | |
240 | .start = 0x10000000, | |
241 | .end = 0x13e00000, | |
242 | .flags = IORESOURCE_MEM, | |
243 | }; | |
244 | ||
245 | /* | |
246 | * The following functions are needed for DMA bouncing. | |
247 | * ITE8152 chip can addrees up to 64MByte, so all the devices | |
248 | * connected to ITE8152 (PCI and USB) should have limited DMA window | |
249 | */ | |
250 | ||
251 | /* | |
252 | * Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all | |
253 | * other devices. | |
254 | */ | |
255 | static int it8152_pci_platform_notify(struct device *dev) | |
256 | { | |
257 | if (dev->bus == &pci_bus_type) { | |
258 | if (dev->dma_mask) | |
259 | *dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET; | |
260 | dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET; | |
261 | dmabounce_register_dev(dev, 2048, 4096); | |
262 | } | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static int it8152_pci_platform_notify_remove(struct device *dev) | |
267 | { | |
268 | if (dev->bus == &pci_bus_type) | |
269 | dmabounce_unregister_dev(dev); | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
274 | int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size) | |
275 | { | |
276 | dev_dbg(dev, "%s: dma_addr %08x, size %08x\n", | |
8e86f427 | 277 | __func__, dma_addr, size); |
a8fc0789 MR |
278 | return (dev->bus == &pci_bus_type) && |
279 | ((dma_addr + size - PHYS_OFFSET) >= SZ_64M); | |
280 | } | |
281 | ||
282 | /* | |
283 | * We override these so we properly do dmabounce otherwise drivers | |
284 | * are able to set the dma_mask to 0xffffffff and we can no longer | |
285 | * trap bounces. :( | |
286 | * | |
287 | * We just return true on everyhing except for < 64MB in which case | |
288 | * we will fail miseralby and die since we can't handle that case. | |
289 | */ | |
290 | int pci_set_dma_mask(struct pci_dev *dev, u64 mask) | |
291 | { | |
8e86f427 | 292 | dev_dbg(&dev->dev, "%s: %llx\n", __func__, mask); |
a8fc0789 MR |
293 | if (mask >= PHYS_OFFSET + SZ_64M - 1) |
294 | return 0; | |
295 | ||
296 | return -EIO; | |
297 | } | |
298 | ||
299 | int | |
300 | pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) | |
301 | { | |
8e86f427 | 302 | dev_dbg(&dev->dev, "%s: %llx\n", __func__, mask); |
a8fc0789 MR |
303 | if (mask >= PHYS_OFFSET + SZ_64M - 1) |
304 | return 0; | |
305 | ||
306 | return -EIO; | |
307 | } | |
308 | ||
309 | int __init it8152_pci_setup(int nr, struct pci_sys_data *sys) | |
310 | { | |
311 | it8152_io.start = IT8152_IO_BASE + 0x12000; | |
312 | it8152_io.end = IT8152_IO_BASE + 0x12000 + 0x100000; | |
313 | ||
314 | sys->mem_offset = 0x10000000; | |
315 | sys->io_offset = IT8152_IO_BASE; | |
316 | ||
317 | if (request_resource(&ioport_resource, &it8152_io)) { | |
318 | printk(KERN_ERR "PCI: unable to allocate IO region\n"); | |
319 | goto err0; | |
320 | } | |
321 | if (request_resource(&iomem_resource, &it8152_mem)) { | |
322 | printk(KERN_ERR "PCI: unable to allocate memory region\n"); | |
323 | goto err1; | |
324 | } | |
325 | ||
326 | sys->resource[0] = &it8152_io; | |
327 | sys->resource[1] = &it8152_mem; | |
328 | ||
329 | if (platform_notify || platform_notify_remove) { | |
330 | printk(KERN_ERR "PCI: Can't use platform_notify\n"); | |
331 | goto err2; | |
332 | } | |
333 | ||
334 | platform_notify = it8152_pci_platform_notify; | |
335 | platform_notify_remove = it8152_pci_platform_notify_remove; | |
336 | ||
337 | return 1; | |
338 | ||
339 | err2: | |
340 | release_resource(&it8152_io); | |
341 | err1: | |
342 | release_resource(&it8152_mem); | |
343 | err0: | |
344 | return -EBUSY; | |
345 | } | |
346 | ||
347 | /* | |
348 | * If we set up a device for bus mastering, we need to check the latency | |
349 | * timer as we don't have even crappy BIOSes to set it properly. | |
350 | * The implementation is from arch/i386/pci/i386.c | |
351 | */ | |
352 | unsigned int pcibios_max_latency = 255; | |
353 | ||
354 | void pcibios_set_master(struct pci_dev *dev) | |
355 | { | |
356 | u8 lat; | |
357 | ||
358 | /* no need to update on-chip OHCI controller */ | |
359 | if ((dev->vendor == PCI_VENDOR_ID_ITE) && | |
360 | (dev->device == PCI_DEVICE_ID_ITE_8152) && | |
361 | ((dev->class >> 8) == PCI_CLASS_SERIAL_USB)) | |
362 | return; | |
363 | ||
364 | pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat); | |
365 | if (lat < 16) | |
366 | lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency; | |
367 | else if (lat > pcibios_max_latency) | |
368 | lat = pcibios_max_latency; | |
369 | else | |
370 | return; | |
371 | printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n", | |
372 | pci_name(dev), lat); | |
373 | pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat); | |
374 | } | |
375 | ||
376 | ||
377 | struct pci_bus * __init it8152_pci_scan_bus(int nr, struct pci_sys_data *sys) | |
378 | { | |
379 | return pci_scan_bus(nr, &it8152_ops, sys); | |
380 | } | |
381 |