1 /*
2 * arch/arm/mach-ixp4xx/common.c
3 *
4 * Generic code shared across all IXP4XX platforms
5 *
6 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
7 *
8 * Copyright 2002 (c) Intel Corporation
9 * Copyright 2003-2004 (c) MontaVista, Software, Inc.
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/mm.h>
18 #include <linux/init.h>
19 #include <linux/serial.h>
20 #include <linux/tty.h>
21 #include <linux/platform_device.h>
22 #include <linux/serial_core.h>
23 #include <linux/interrupt.h>
24 #include <linux/bitops.h>
25 #include <linux/io.h>
26 #include <linux/export.h>
27 #include <linux/cpu.h>
28 #include <linux/pci.h>
29 #include <linux/sched_clock.h>
30 #include <linux/irqchip/irq-ixp4xx.h>
31 #include <linux/platform_data/timer-ixp4xx.h>
32 #include <mach/udc.h>
33 #include <mach/hardware.h>
34 #include <mach/io.h>
35 #include <linux/uaccess.h>
36 #include <asm/pgtable.h>
37 #include <asm/page.h>
38 #include <asm/exception.h>
39 #include <asm/irq.h>
40 #include <asm/system_misc.h>
41 #include <asm/mach/map.h>
42 #include <asm/mach/irq.h>
43 #include <asm/mach/time.h>
44
45 #include "irqs.h"
46
47 #define IXP4XX_TIMER_FREQ 66666000
48
49 /*************************************************************************
50 * IXP4xx chipset I/O mapping
51 *************************************************************************/
52 static struct map_desc ixp4xx_io_desc[] __initdata = {
53 { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
54 .virtual = (unsigned long)IXP4XX_PERIPHERAL_BASE_VIRT,
55 .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
56 .length = IXP4XX_PERIPHERAL_REGION_SIZE,
57 .type = MT_DEVICE
58 }, { /* Expansion Bus Config Registers */
59 .virtual = (unsigned long)IXP4XX_EXP_CFG_BASE_VIRT,
60 .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
61 .length = IXP4XX_EXP_CFG_REGION_SIZE,
62 .type = MT_DEVICE
63 }, { /* PCI Registers */
64 .virtual = (unsigned long)IXP4XX_PCI_CFG_BASE_VIRT,
65 .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
66 .length = IXP4XX_PCI_CFG_REGION_SIZE,
67 .type = MT_DEVICE
68 },
69 };
70
ixp4xx_map_io(void)71 void __init ixp4xx_map_io(void)
72 {
73 iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
74 }
75
ixp4xx_init_irq(void)76 void __init ixp4xx_init_irq(void)
77 {
78 /*
79 * ixp4xx does not implement the XScale PWRMODE register
80 * so it must not call cpu_do_idle().
81 */
82 cpu_idle_poll_ctrl(true);
83
84 ixp4xx_irq_init(IXP4XX_INTC_BASE_PHYS,
85 (cpu_is_ixp46x() || cpu_is_ixp43x()));
86 }
87
ixp4xx_timer_init(void)88 void __init ixp4xx_timer_init(void)
89 {
90 return ixp4xx_timer_setup(IXP4XX_TIMER_BASE_PHYS,
91 IRQ_IXP4XX_TIMER1,
92 IXP4XX_TIMER_FREQ);
93 }
94
95 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
96
ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info * info)97 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
98 {
99 memcpy(&ixp4xx_udc_info, info, sizeof *info);
100 }
101
102 static struct resource ixp4xx_udc_resources[] = {
103 [0] = {
104 .start = 0xc800b000,
105 .end = 0xc800bfff,
106 .flags = IORESOURCE_MEM,
107 },
108 [1] = {
109 .start = IRQ_IXP4XX_USB,
110 .end = IRQ_IXP4XX_USB,
111 .flags = IORESOURCE_IRQ,
112 },
113 };
114
115 static struct resource ixp4xx_gpio_resource[] = {
116 {
117 .start = IXP4XX_GPIO_BASE_PHYS,
118 .end = IXP4XX_GPIO_BASE_PHYS + 0xfff,
119 .flags = IORESOURCE_MEM,
120 },
121 };
122
123 static struct platform_device ixp4xx_gpio_device = {
124 .name = "ixp4xx-gpio",
125 .id = -1,
126 .dev = {
127 .coherent_dma_mask = DMA_BIT_MASK(32),
128 },
129 .resource = ixp4xx_gpio_resource,
130 .num_resources = ARRAY_SIZE(ixp4xx_gpio_resource),
131 };
132
133 /*
134 * USB device controller. The IXP4xx uses the same controller as PXA25X,
135 * so we just use the same device.
136 */
137 static struct platform_device ixp4xx_udc_device = {
138 .name = "pxa25x-udc",
139 .id = -1,
140 .num_resources = 2,
141 .resource = ixp4xx_udc_resources,
142 .dev = {
143 .platform_data = &ixp4xx_udc_info,
144 },
145 };
146
147 static struct resource ixp4xx_npe_resources[] = {
148 {
149 .start = IXP4XX_NPEA_BASE_PHYS,
150 .end = IXP4XX_NPEA_BASE_PHYS + 0xfff,
151 .flags = IORESOURCE_MEM,
152 },
153 {
154 .start = IXP4XX_NPEB_BASE_PHYS,
155 .end = IXP4XX_NPEB_BASE_PHYS + 0xfff,
156 .flags = IORESOURCE_MEM,
157 },
158 {
159 .start = IXP4XX_NPEC_BASE_PHYS,
160 .end = IXP4XX_NPEC_BASE_PHYS + 0xfff,
161 .flags = IORESOURCE_MEM,
162 },
163
164 };
165
166 static struct platform_device ixp4xx_npe_device = {
167 .name = "ixp4xx-npe",
168 .id = -1,
169 .num_resources = ARRAY_SIZE(ixp4xx_npe_resources),
170 .resource = ixp4xx_npe_resources,
171 };
172
173 static struct resource ixp4xx_qmgr_resources[] = {
174 {
175 .start = IXP4XX_QMGR_BASE_PHYS,
176 .end = IXP4XX_QMGR_BASE_PHYS + 0x3fff,
177 .flags = IORESOURCE_MEM,
178 },
179 {
180 .start = IRQ_IXP4XX_QM1,
181 .end = IRQ_IXP4XX_QM1,
182 .flags = IORESOURCE_IRQ,
183 },
184 {
185 .start = IRQ_IXP4XX_QM2,
186 .end = IRQ_IXP4XX_QM2,
187 .flags = IORESOURCE_IRQ,
188 },
189 };
190
191 static struct platform_device ixp4xx_qmgr_device = {
192 .name = "ixp4xx-qmgr",
193 .id = -1,
194 .num_resources = ARRAY_SIZE(ixp4xx_qmgr_resources),
195 .resource = ixp4xx_qmgr_resources,
196 };
197
198 static struct platform_device *ixp4xx_devices[] __initdata = {
199 &ixp4xx_npe_device,
200 &ixp4xx_qmgr_device,
201 &ixp4xx_gpio_device,
202 &ixp4xx_udc_device,
203 };
204
205 static struct resource ixp46x_i2c_resources[] = {
206 [0] = {
207 .start = 0xc8011000,
208 .end = 0xc801101c,
209 .flags = IORESOURCE_MEM,
210 },
211 [1] = {
212 .start = IRQ_IXP4XX_I2C,
213 .end = IRQ_IXP4XX_I2C,
214 .flags = IORESOURCE_IRQ
215 }
216 };
217
218 /*
219 * I2C controller. The IXP46x uses the same block as the IOP3xx, so
220 * we just use the same device name.
221 */
222 static struct platform_device ixp46x_i2c_controller = {
223 .name = "IOP3xx-I2C",
224 .id = 0,
225 .num_resources = 2,
226 .resource = ixp46x_i2c_resources
227 };
228
229 static struct platform_device *ixp46x_devices[] __initdata = {
230 &ixp46x_i2c_controller
231 };
232
233 unsigned long ixp4xx_exp_bus_size;
234 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
235
ixp4xx_sys_init(void)236 void __init ixp4xx_sys_init(void)
237 {
238 ixp4xx_exp_bus_size = SZ_16M;
239
240 platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
241
242 if (cpu_is_ixp46x()) {
243 int region;
244
245 platform_add_devices(ixp46x_devices,
246 ARRAY_SIZE(ixp46x_devices));
247
248 for (region = 0; region < 7; region++) {
249 if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
250 ixp4xx_exp_bus_size = SZ_32M;
251 break;
252 }
253 }
254 }
255
256 printk("IXP4xx: Using %luMiB expansion bus window size\n",
257 ixp4xx_exp_bus_size >> 20);
258 }
259
260 unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
261 EXPORT_SYMBOL(ixp4xx_timer_freq);
262
ixp4xx_restart(enum reboot_mode mode,const char * cmd)263 void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
264 {
265 if (mode == REBOOT_SOFT) {
266 /* Jump into ROM at address 0 */
267 soft_restart(0);
268 } else {
269 /* Use on-chip reset capability */
270
271 /* set the "key" register to enable access to
272 * "timer" and "enable" registers
273 */
274 *IXP4XX_OSWK = IXP4XX_WDT_KEY;
275
276 /* write 0 to the timer register for an immediate reset */
277 *IXP4XX_OSWT = 0;
278
279 *IXP4XX_OSWE = IXP4XX_WDT_RESET_ENABLE | IXP4XX_WDT_COUNT_ENABLE;
280 }
281 }
282
283 #ifdef CONFIG_PCI
ixp4xx_needs_bounce(struct device * dev,dma_addr_t dma_addr,size_t size)284 static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
285 {
286 return (dma_addr + size) > SZ_64M;
287 }
288
ixp4xx_platform_notify_remove(struct device * dev)289 static int ixp4xx_platform_notify_remove(struct device *dev)
290 {
291 if (dev_is_pci(dev))
292 dmabounce_unregister_dev(dev);
293
294 return 0;
295 }
296 #endif
297
298 /*
299 * Setup DMA mask to 64MB on PCI devices and 4 GB on all other things.
300 */
ixp4xx_platform_notify(struct device * dev)301 static int ixp4xx_platform_notify(struct device *dev)
302 {
303 dev->dma_mask = &dev->coherent_dma_mask;
304
305 #ifdef CONFIG_PCI
306 if (dev_is_pci(dev)) {
307 dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */
308 dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
309 return 0;
310 }
311 #endif
312
313 dev->coherent_dma_mask = DMA_BIT_MASK(32);
314 return 0;
315 }
316
dma_set_coherent_mask(struct device * dev,u64 mask)317 int dma_set_coherent_mask(struct device *dev, u64 mask)
318 {
319 if (dev_is_pci(dev))
320 mask &= DMA_BIT_MASK(28); /* 64 MB */
321
322 if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) {
323 dev->coherent_dma_mask = mask;
324 return 0;
325 }
326
327 return -EIO; /* device wanted sub-64MB mask */
328 }
329 EXPORT_SYMBOL(dma_set_coherent_mask);
330
331 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
332 /*
333 * In the case of using indirect PCI, we simply return the actual PCI
334 * address and our read/write implementation use that to drive the
335 * access registers. If something outside of PCI is ioremap'd, we
336 * fallback to the default.
337 */
338
ixp4xx_ioremap_caller(phys_addr_t addr,size_t size,unsigned int mtype,void * caller)339 static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size,
340 unsigned int mtype, void *caller)
341 {
342 if (!is_pci_memory(addr))
343 return __arm_ioremap_caller(addr, size, mtype, caller);
344
345 return (void __iomem *)addr;
346 }
347
ixp4xx_iounmap(volatile void __iomem * addr)348 static void ixp4xx_iounmap(volatile void __iomem *addr)
349 {
350 if (!is_pci_memory((__force u32)addr))
351 __iounmap(addr);
352 }
353 #endif
354
ixp4xx_init_early(void)355 void __init ixp4xx_init_early(void)
356 {
357 platform_notify = ixp4xx_platform_notify;
358 #ifdef CONFIG_PCI
359 platform_notify_remove = ixp4xx_platform_notify_remove;
360 #endif
361 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
362 arch_ioremap_caller = ixp4xx_ioremap_caller;
363 arch_iounmap = ixp4xx_iounmap;
364 #endif
365 }
366