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/soc/ixp4xx/cpu.h>
31 #include <linux/irqchip/irq-ixp4xx.h>
32 #include <linux/platform_data/timer-ixp4xx.h>
33 #include <linux/dma-map-ops.h>
34 #include <mach/udc.h>
35 #include <mach/hardware.h>
36 #include <linux/uaccess.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
ixp4xx_read_feature_bits(void)47 u32 ixp4xx_read_feature_bits(void)
48 {
49 u32 val = ~__raw_readl(IXP4XX_EXP_CFG2);
50
51 if (cpu_is_ixp42x_rev_a0())
52 return IXP42X_FEATURE_MASK & ~(IXP4XX_FEATURE_RCOMP |
53 IXP4XX_FEATURE_AES);
54 if (cpu_is_ixp42x())
55 return val & IXP42X_FEATURE_MASK;
56 if (cpu_is_ixp43x())
57 return val & IXP43X_FEATURE_MASK;
58 return val & IXP46X_FEATURE_MASK;
59 }
60 EXPORT_SYMBOL(ixp4xx_read_feature_bits);
61
ixp4xx_write_feature_bits(u32 value)62 void ixp4xx_write_feature_bits(u32 value)
63 {
64 __raw_writel(~value, IXP4XX_EXP_CFG2);
65 }
66 EXPORT_SYMBOL(ixp4xx_write_feature_bits);
67
68 #define IXP4XX_TIMER_FREQ 66666000
69
70 /*************************************************************************
71 * IXP4xx chipset I/O mapping
72 *************************************************************************/
73 static struct map_desc ixp4xx_io_desc[] __initdata = {
74 { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
75 .virtual = (unsigned long)IXP4XX_PERIPHERAL_BASE_VIRT,
76 .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
77 .length = IXP4XX_PERIPHERAL_REGION_SIZE,
78 .type = MT_DEVICE
79 }, { /* Expansion Bus Config Registers */
80 .virtual = (unsigned long)IXP4XX_EXP_CFG_BASE_VIRT,
81 .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
82 .length = IXP4XX_EXP_CFG_REGION_SIZE,
83 .type = MT_DEVICE
84 }, { /* PCI Registers */
85 .virtual = (unsigned long)IXP4XX_PCI_CFG_BASE_VIRT,
86 .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
87 .length = IXP4XX_PCI_CFG_REGION_SIZE,
88 .type = MT_DEVICE
89 },
90 };
91
ixp4xx_map_io(void)92 void __init ixp4xx_map_io(void)
93 {
94 iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
95 }
96
ixp4xx_init_irq(void)97 void __init ixp4xx_init_irq(void)
98 {
99 /*
100 * ixp4xx does not implement the XScale PWRMODE register
101 * so it must not call cpu_do_idle().
102 */
103 cpu_idle_poll_ctrl(true);
104
105 ixp4xx_irq_init(IXP4XX_INTC_BASE_PHYS,
106 (cpu_is_ixp46x() || cpu_is_ixp43x()));
107 }
108
ixp4xx_timer_init(void)109 void __init ixp4xx_timer_init(void)
110 {
111 return ixp4xx_timer_setup(IXP4XX_TIMER_BASE_PHYS,
112 IRQ_IXP4XX_TIMER1,
113 IXP4XX_TIMER_FREQ);
114 }
115
116 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
117
ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info * info)118 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
119 {
120 memcpy(&ixp4xx_udc_info, info, sizeof *info);
121 }
122
123 static struct resource ixp4xx_udc_resources[] = {
124 [0] = {
125 .start = 0xc800b000,
126 .end = 0xc800bfff,
127 .flags = IORESOURCE_MEM,
128 },
129 [1] = {
130 .start = IRQ_IXP4XX_USB,
131 .end = IRQ_IXP4XX_USB,
132 .flags = IORESOURCE_IRQ,
133 },
134 };
135
136 static struct resource ixp4xx_gpio_resource[] = {
137 {
138 .start = IXP4XX_GPIO_BASE_PHYS,
139 .end = IXP4XX_GPIO_BASE_PHYS + 0xfff,
140 .flags = IORESOURCE_MEM,
141 },
142 };
143
144 static struct platform_device ixp4xx_gpio_device = {
145 .name = "ixp4xx-gpio",
146 .id = -1,
147 .dev = {
148 .coherent_dma_mask = DMA_BIT_MASK(32),
149 },
150 .resource = ixp4xx_gpio_resource,
151 .num_resources = ARRAY_SIZE(ixp4xx_gpio_resource),
152 };
153
154 /*
155 * USB device controller. The IXP4xx uses the same controller as PXA25X,
156 * so we just use the same device.
157 */
158 static struct platform_device ixp4xx_udc_device = {
159 .name = "pxa25x-udc",
160 .id = -1,
161 .num_resources = 2,
162 .resource = ixp4xx_udc_resources,
163 .dev = {
164 .platform_data = &ixp4xx_udc_info,
165 },
166 };
167
168 static struct resource ixp4xx_npe_resources[] = {
169 {
170 .start = IXP4XX_NPEA_BASE_PHYS,
171 .end = IXP4XX_NPEA_BASE_PHYS + 0xfff,
172 .flags = IORESOURCE_MEM,
173 },
174 {
175 .start = IXP4XX_NPEB_BASE_PHYS,
176 .end = IXP4XX_NPEB_BASE_PHYS + 0xfff,
177 .flags = IORESOURCE_MEM,
178 },
179 {
180 .start = IXP4XX_NPEC_BASE_PHYS,
181 .end = IXP4XX_NPEC_BASE_PHYS + 0xfff,
182 .flags = IORESOURCE_MEM,
183 },
184
185 };
186
187 static struct platform_device ixp4xx_npe_device = {
188 .name = "ixp4xx-npe",
189 .id = -1,
190 .num_resources = ARRAY_SIZE(ixp4xx_npe_resources),
191 .resource = ixp4xx_npe_resources,
192 };
193
194 static struct resource ixp4xx_qmgr_resources[] = {
195 {
196 .start = IXP4XX_QMGR_BASE_PHYS,
197 .end = IXP4XX_QMGR_BASE_PHYS + 0x3fff,
198 .flags = IORESOURCE_MEM,
199 },
200 {
201 .start = IRQ_IXP4XX_QM1,
202 .end = IRQ_IXP4XX_QM1,
203 .flags = IORESOURCE_IRQ,
204 },
205 {
206 .start = IRQ_IXP4XX_QM2,
207 .end = IRQ_IXP4XX_QM2,
208 .flags = IORESOURCE_IRQ,
209 },
210 };
211
212 static struct platform_device ixp4xx_qmgr_device = {
213 .name = "ixp4xx-qmgr",
214 .id = -1,
215 .num_resources = ARRAY_SIZE(ixp4xx_qmgr_resources),
216 .resource = ixp4xx_qmgr_resources,
217 };
218
219 static struct platform_device *ixp4xx_devices[] __initdata = {
220 &ixp4xx_npe_device,
221 &ixp4xx_qmgr_device,
222 &ixp4xx_gpio_device,
223 &ixp4xx_udc_device,
224 };
225
226 static struct resource ixp46x_i2c_resources[] = {
227 [0] = {
228 .start = 0xc8011000,
229 .end = 0xc801101c,
230 .flags = IORESOURCE_MEM,
231 },
232 [1] = {
233 .start = IRQ_IXP4XX_I2C,
234 .end = IRQ_IXP4XX_I2C,
235 .flags = IORESOURCE_IRQ
236 }
237 };
238
239 /* A single 32-bit register on IXP46x */
240 #define IXP4XX_HWRANDOM_BASE_PHYS 0x70002100
241
242 static struct resource ixp46x_hwrandom_resource[] = {
243 {
244 .start = IXP4XX_HWRANDOM_BASE_PHYS,
245 .end = IXP4XX_HWRANDOM_BASE_PHYS + 0x3,
246 .flags = IORESOURCE_MEM,
247 },
248 };
249
250 static struct platform_device ixp46x_hwrandom_device = {
251 .name = "ixp4xx-hwrandom",
252 .id = -1,
253 .dev = {
254 .coherent_dma_mask = DMA_BIT_MASK(32),
255 },
256 .resource = ixp46x_hwrandom_resource,
257 .num_resources = ARRAY_SIZE(ixp46x_hwrandom_resource),
258 };
259
260 /*
261 * I2C controller. The IXP46x uses the same block as the IOP3xx, so
262 * we just use the same device name.
263 */
264 static struct platform_device ixp46x_i2c_controller = {
265 .name = "IOP3xx-I2C",
266 .id = 0,
267 .num_resources = 2,
268 .resource = ixp46x_i2c_resources
269 };
270
271 static struct resource ixp46x_ptp_resources[] = {
272 DEFINE_RES_MEM(IXP4XX_TIMESYNC_BASE_PHYS, SZ_4K),
273 DEFINE_RES_IRQ_NAMED(IRQ_IXP4XX_GPIO8, "master"),
274 DEFINE_RES_IRQ_NAMED(IRQ_IXP4XX_GPIO7, "slave"),
275 };
276
277 static struct platform_device ixp46x_ptp = {
278 .name = "ptp-ixp46x",
279 .id = -1,
280 .resource = ixp46x_ptp_resources,
281 .num_resources = ARRAY_SIZE(ixp46x_ptp_resources),
282 };
283
284 static struct platform_device *ixp46x_devices[] __initdata = {
285 &ixp46x_hwrandom_device,
286 &ixp46x_i2c_controller,
287 &ixp46x_ptp,
288 };
289
290 unsigned long ixp4xx_exp_bus_size;
291 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
292
293 static struct platform_device_info ixp_dev_info __initdata = {
294 .name = "ixp4xx_crypto",
295 .id = 0,
296 .dma_mask = DMA_BIT_MASK(32),
297 };
298
ixp_crypto_register(void)299 static int __init ixp_crypto_register(void)
300 {
301 struct platform_device *pdev;
302
303 if (!(~(*IXP4XX_EXP_CFG2) & (IXP4XX_FEATURE_HASH |
304 IXP4XX_FEATURE_AES | IXP4XX_FEATURE_DES))) {
305 printk(KERN_ERR "ixp_crypto: No HW crypto available\n");
306 return -ENODEV;
307 }
308
309 pdev = platform_device_register_full(&ixp_dev_info);
310 if (IS_ERR(pdev))
311 return PTR_ERR(pdev);
312
313 return 0;
314 }
315
ixp4xx_sys_init(void)316 void __init ixp4xx_sys_init(void)
317 {
318 ixp4xx_exp_bus_size = SZ_16M;
319
320 platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
321
322 if (IS_ENABLED(CONFIG_CRYPTO_DEV_IXP4XX))
323 ixp_crypto_register();
324
325 if (cpu_is_ixp46x()) {
326 int region;
327
328 platform_add_devices(ixp46x_devices,
329 ARRAY_SIZE(ixp46x_devices));
330
331 for (region = 0; region < 7; region++) {
332 if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
333 ixp4xx_exp_bus_size = SZ_32M;
334 break;
335 }
336 }
337 }
338
339 printk("IXP4xx: Using %luMiB expansion bus window size\n",
340 ixp4xx_exp_bus_size >> 20);
341 }
342
343 unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
344 EXPORT_SYMBOL(ixp4xx_timer_freq);
345
ixp4xx_restart(enum reboot_mode mode,const char * cmd)346 void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
347 {
348 if (mode == REBOOT_SOFT) {
349 /* Jump into ROM at address 0 */
350 soft_restart(0);
351 } else {
352 /* Use on-chip reset capability */
353
354 /* set the "key" register to enable access to
355 * "timer" and "enable" registers
356 */
357 *IXP4XX_OSWK = IXP4XX_WDT_KEY;
358
359 /* write 0 to the timer register for an immediate reset */
360 *IXP4XX_OSWT = 0;
361
362 *IXP4XX_OSWE = IXP4XX_WDT_RESET_ENABLE | IXP4XX_WDT_COUNT_ENABLE;
363 }
364 }
365
366 #ifdef CONFIG_PCI
ixp4xx_needs_bounce(struct device * dev,dma_addr_t dma_addr,size_t size)367 static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
368 {
369 return (dma_addr + size) > SZ_64M;
370 }
371
ixp4xx_platform_notify_remove(struct device * dev)372 static int ixp4xx_platform_notify_remove(struct device *dev)
373 {
374 if (dev_is_pci(dev))
375 dmabounce_unregister_dev(dev);
376
377 return 0;
378 }
379 #endif
380
381 /*
382 * Setup DMA mask to 64MB on PCI devices and 4 GB on all other things.
383 */
ixp4xx_platform_notify(struct device * dev)384 static int ixp4xx_platform_notify(struct device *dev)
385 {
386 dev->dma_mask = &dev->coherent_dma_mask;
387
388 #ifdef CONFIG_PCI
389 if (dev_is_pci(dev)) {
390 dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */
391 dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
392 return 0;
393 }
394 #endif
395
396 dev->coherent_dma_mask = DMA_BIT_MASK(32);
397 return 0;
398 }
399
dma_set_coherent_mask(struct device * dev,u64 mask)400 int dma_set_coherent_mask(struct device *dev, u64 mask)
401 {
402 if (dev_is_pci(dev))
403 mask &= DMA_BIT_MASK(28); /* 64 MB */
404
405 if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) {
406 dev->coherent_dma_mask = mask;
407 return 0;
408 }
409
410 return -EIO; /* device wanted sub-64MB mask */
411 }
412 EXPORT_SYMBOL(dma_set_coherent_mask);
413
414 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
415 /*
416 * In the case of using indirect PCI, we simply return the actual PCI
417 * address and our read/write implementation use that to drive the
418 * access registers. If something outside of PCI is ioremap'd, we
419 * fallback to the default.
420 */
421
ixp4xx_ioremap_caller(phys_addr_t addr,size_t size,unsigned int mtype,void * caller)422 static void __iomem *ixp4xx_ioremap_caller(phys_addr_t addr, size_t size,
423 unsigned int mtype, void *caller)
424 {
425 if (!is_pci_memory(addr))
426 return __arm_ioremap_caller(addr, size, mtype, caller);
427
428 return (void __iomem *)addr;
429 }
430
ixp4xx_iounmap(volatile void __iomem * addr)431 static void ixp4xx_iounmap(volatile void __iomem *addr)
432 {
433 if (!is_pci_memory((__force u32)addr))
434 __iounmap(addr);
435 }
436 #endif
437
ixp4xx_init_early(void)438 void __init ixp4xx_init_early(void)
439 {
440 platform_notify = ixp4xx_platform_notify;
441 #ifdef CONFIG_PCI
442 platform_notify_remove = ixp4xx_platform_notify_remove;
443 #endif
444 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
445 arch_ioremap_caller = ixp4xx_ioremap_caller;
446 arch_iounmap = ixp4xx_iounmap;
447 #endif
448 }
449