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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2007-10-15 13:55:44 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-10-15 13:56:02 -0400
commit0181b61a988424b5cc44fe09e6968142359c815e (patch)
tree2575ee900a39ffaa169ad5aeb8aa6ddee11cfbe5 /arch/arm/common
parent92633b72d18ca4f25de1f28e436a882159491e7e (diff)
parent87944f3361fc033b73617aa663135c6e468957a7 (diff)
Merge branch 'pxa' into devel
Diffstat (limited to 'arch/arm/common')
-rw-r--r--arch/arm/common/Makefile1
-rw-r--r--arch/arm/common/it8152.c387
2 files changed, 388 insertions, 0 deletions
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index e1289a256ce5..3d0b9fa42f84 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -17,3 +17,4 @@ obj-$(CONFIG_SHARPSL_PM) += sharpsl_pm.o
17obj-$(CONFIG_SHARP_SCOOP) += scoop.o 17obj-$(CONFIG_SHARP_SCOOP) += scoop.o
18obj-$(CONFIG_ARCH_IXP2000) += uengine.o 18obj-$(CONFIG_ARCH_IXP2000) += uengine.o
19obj-$(CONFIG_ARCH_IXP23XX) += uengine.o 19obj-$(CONFIG_ARCH_IXP23XX) += uengine.o
20obj-$(CONFIG_PCI_HOST_ITE8152) += it8152.o
diff --git a/arch/arm/common/it8152.c b/arch/arm/common/it8152.c
new file mode 100644
index 000000000000..c03de9bfd76b
--- /dev/null
+++ b/arch/arm/common/it8152.c
@@ -0,0 +1,387 @@
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
35static 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
52static 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
69static inline void it8152_irq(int irq)
70{
71 struct irq_desc *desc;
72
73 printk(KERN_DEBUG "===> %s: irq=%d\n", __FUNCTION__, irq);
74
75 desc = irq_desc + irq;
76 desc_handle_irq(irq, desc);
77}
78
79static struct irq_chip it8152_irq_chip = {
80 .name = "it8152",
81 .ack = it8152_mask_irq,
82 .mask = it8152_mask_irq,
83 .unmask = it8152_unmask_irq,
84};
85
86void it8152_init_irq(void)
87{
88 int irq;
89
90 __raw_writel((0xffff), IT8152_INTC_PDCNIMR);
91 __raw_writel((0), IT8152_INTC_PDCNIRR);
92 __raw_writel((0xffff), IT8152_INTC_LPCNIMR);
93 __raw_writel((0), IT8152_INTC_LPCNIRR);
94 __raw_writel((0xffff), IT8152_INTC_LDCNIMR);
95 __raw_writel((0), IT8152_INTC_LDCNIRR);
96
97 for (irq = IT8152_IRQ(0); irq <= IT8152_LAST_IRQ; irq++) {
98 set_irq_chip(irq, &it8152_irq_chip);
99 set_irq_handler(irq, handle_level_irq);
100 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
101 }
102}
103
104void it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
105{
106 int bits_pd, bits_lp, bits_ld;
107 int i;
108
109 printk(KERN_DEBUG "=> %s: irq = %d\n", __FUNCTION__, irq);
110
111 while (1) {
112 /* Read all */
113 bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
114 bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
115 bits_ld = __raw_readl(IT8152_INTC_LDCNIRR);
116
117 /* Ack */
118 __raw_writel((~bits_pd), IT8152_INTC_PDCNIRR);
119 __raw_writel((~bits_lp), IT8152_INTC_LPCNIRR);
120 __raw_writel((~bits_ld), IT8152_INTC_LDCNIRR);
121
122 if (!(bits_ld | bits_lp | bits_pd)) {
123 /* Re-read to guarantee, that there was a moment of
124 time, when they all three were 0. */
125 bits_pd = __raw_readl(IT8152_INTC_PDCNIRR);
126 bits_lp = __raw_readl(IT8152_INTC_LPCNIRR);
127 if (!(bits_ld | bits_lp | bits_pd))
128 return;
129 }
130
131 bits_pd &= ((1 << IT8152_PD_IRQ_COUNT) - 1);
132 while (bits_pd) {
133 i = __ffs(bits_pd);
134 it8152_irq(IT8152_PD_IRQ(i));
135 bits_pd &= ~(1 << i);
136 }
137
138 bits_lp &= ((1 << IT8152_LP_IRQ_COUNT) - 1);
139 while (bits_lp) {
140 i = __ffs(bits_pd);
141 it8152_irq(IT8152_LP_IRQ(i));
142 bits_lp &= ~(1 << i);
143 }
144
145 bits_ld &= ((1 << IT8152_LD_IRQ_COUNT) - 1);
146 while (bits_ld) {
147 i = __ffs(bits_pd);
148 it8152_irq(IT8152_LD_IRQ(i));
149 bits_ld &= ~(1 << i);
150 }
151 }
152}
153
154/* mapping for on-chip devices */
155int __init it8152_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
156{
157 if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
158 (dev->device == PCI_DEVICE_ID_ITE_8152)) {
159 if ((dev->class >> 8) == PCI_CLASS_MULTIMEDIA_AUDIO)
160 return IT8152_AUDIO_INT;
161 if ((dev->class >> 8) == PCI_CLASS_SERIAL_USB)
162 return IT8152_USB_INT;
163 if ((dev->class >> 8) == PCI_CLASS_SYSTEM_DMA)
164 return IT8152_CDMA_INT;
165 }
166
167 return 0;
168}
169
170static unsigned long it8152_pci_dev_base_address(struct pci_bus *bus,
171 unsigned int devfn)
172{
173 unsigned long addr = 0;
174
175 if (bus->number == 0) {
176 if (devfn < PCI_DEVFN(MAX_SLOTS, 0))
177 addr = (devfn << 8);
178 } else
179 addr = (bus->number << 16) | (devfn << 8);
180
181 return addr;
182}
183
184static int it8152_pci_read_config(struct pci_bus *bus,
185 unsigned int devfn, int where,
186 int size, u32 *value)
187{
188 unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
189 u32 v;
190 int shift;
191
192 shift = (where & 3);
193
194 __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
195 v = (__raw_readl(IT8152_PCI_CFG_DATA) >> (8 * (shift)));
196
197 *value = v;
198
199 return PCIBIOS_SUCCESSFUL;
200}
201
202static int it8152_pci_write_config(struct pci_bus *bus,
203 unsigned int devfn, int where,
204 int size, u32 value)
205{
206 unsigned long addr = it8152_pci_dev_base_address(bus, devfn);
207 u32 v, vtemp, mask = 0;
208 int shift;
209
210 if (size == 1)
211 mask = 0xff;
212 if (size == 2)
213 mask = 0xffff;
214
215 shift = (where & 3);
216
217 __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
218 vtemp = __raw_readl(IT8152_PCI_CFG_DATA);
219
220 if (mask)
221 vtemp &= ~(mask << (8 * shift));
222 else
223 vtemp = 0;
224
225 v = (value << (8 * shift));
226 __raw_writel((addr + where), IT8152_PCI_CFG_ADDR);
227 __raw_writel((v | vtemp), IT8152_PCI_CFG_DATA);
228
229 return PCIBIOS_SUCCESSFUL;
230}
231
232static struct pci_ops it8152_ops = {
233 .read = it8152_pci_read_config,
234 .write = it8152_pci_write_config,
235};
236
237static struct resource it8152_io = {
238 .name = "IT8152 PCI I/O region",
239 .flags = IORESOURCE_IO,
240};
241
242static struct resource it8152_mem = {
243 .name = "IT8152 PCI memory region",
244 .start = 0x10000000,
245 .end = 0x13e00000,
246 .flags = IORESOURCE_MEM,
247};
248
249/*
250 * The following functions are needed for DMA bouncing.
251 * ITE8152 chip can addrees up to 64MByte, so all the devices
252 * connected to ITE8152 (PCI and USB) should have limited DMA window
253 */
254
255/*
256 * Setup DMA mask to 64MB on devices connected to ITE8152. Ignore all
257 * other devices.
258 */
259static int it8152_pci_platform_notify(struct device *dev)
260{
261 if (dev->bus == &pci_bus_type) {
262 if (dev->dma_mask)
263 *dev->dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
264 dev->coherent_dma_mask = (SZ_64M - 1) | PHYS_OFFSET;
265 dmabounce_register_dev(dev, 2048, 4096);
266 }
267 return 0;
268}
269
270static int it8152_pci_platform_notify_remove(struct device *dev)
271{
272 if (dev->bus == &pci_bus_type)
273 dmabounce_unregister_dev(dev);
274
275 return 0;
276}
277
278int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
279{
280 dev_dbg(dev, "%s: dma_addr %08x, size %08x\n",
281 __FUNCTION__, dma_addr, size);
282 return (dev->bus == &pci_bus_type) &&
283 ((dma_addr + size - PHYS_OFFSET) >= SZ_64M);
284}
285
286/*
287 * We override these so we properly do dmabounce otherwise drivers
288 * are able to set the dma_mask to 0xffffffff and we can no longer
289 * trap bounces. :(
290 *
291 * We just return true on everyhing except for < 64MB in which case
292 * we will fail miseralby and die since we can't handle that case.
293 */
294int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
295{
296 printk(KERN_DEBUG "%s: %s %llx\n",
297 __FUNCTION__, dev->dev.bus_id, mask);
298 if (mask >= PHYS_OFFSET + SZ_64M - 1)
299 return 0;
300
301 return -EIO;
302}
303
304int
305pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
306{
307 printk(KERN_DEBUG "%s: %s %llx\n",
308 __FUNCTION__, dev->dev.bus_id, mask);
309 if (mask >= PHYS_OFFSET + SZ_64M - 1)
310 return 0;
311
312 return -EIO;
313}
314
315int __init it8152_pci_setup(int nr, struct pci_sys_data *sys)
316{
317 it8152_io.start = IT8152_IO_BASE + 0x12000;
318 it8152_io.end = IT8152_IO_BASE + 0x12000 + 0x100000;
319
320 sys->mem_offset = 0x10000000;
321 sys->io_offset = IT8152_IO_BASE;
322
323 if (request_resource(&ioport_resource, &it8152_io)) {
324 printk(KERN_ERR "PCI: unable to allocate IO region\n");
325 goto err0;
326 }
327 if (request_resource(&iomem_resource, &it8152_mem)) {
328 printk(KERN_ERR "PCI: unable to allocate memory region\n");
329 goto err1;
330 }
331
332 sys->resource[0] = &it8152_io;
333 sys->resource[1] = &it8152_mem;
334
335 if (platform_notify || platform_notify_remove) {
336 printk(KERN_ERR "PCI: Can't use platform_notify\n");
337 goto err2;
338 }
339
340 platform_notify = it8152_pci_platform_notify;
341 platform_notify_remove = it8152_pci_platform_notify_remove;
342
343 return 1;
344
345err2:
346 release_resource(&it8152_io);
347err1:
348 release_resource(&it8152_mem);
349err0:
350 return -EBUSY;
351}
352
353/*
354 * If we set up a device for bus mastering, we need to check the latency
355 * timer as we don't have even crappy BIOSes to set it properly.
356 * The implementation is from arch/i386/pci/i386.c
357 */
358unsigned int pcibios_max_latency = 255;
359
360void pcibios_set_master(struct pci_dev *dev)
361{
362 u8 lat;
363
364 /* no need to update on-chip OHCI controller */
365 if ((dev->vendor == PCI_VENDOR_ID_ITE) &&
366 (dev->device == PCI_DEVICE_ID_ITE_8152) &&
367 ((dev->class >> 8) == PCI_CLASS_SERIAL_USB))
368 return;
369
370 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
371 if (lat < 16)
372 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
373 else if (lat > pcibios_max_latency)
374 lat = pcibios_max_latency;
375 else
376 return;
377 printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n",
378 pci_name(dev), lat);
379 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
380}
381
382
383struct pci_bus * __init it8152_pci_scan_bus(int nr, struct pci_sys_data *sys)
384{
385 return pci_scan_bus(nr, &it8152_ops, sys);
386}
387