1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-pxa/pxa27x.c
4 *
5 * Author: Nicolas Pitre
6 * Created: Nov 05, 2002
7 * Copyright: MontaVista Software Inc.
8 *
9 * Code specific to PXA27x aka Bulverde.
10 */
11 #include <linux/dmaengine.h>
12 #include <linux/dma/pxa-dma.h>
13 #include <linux/gpio.h>
14 #include <linux/gpio-pxa.h>
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/irqchip.h>
19 #include <linux/suspend.h>
20 #include <linux/platform_device.h>
21 #include <linux/syscore_ops.h>
22 #include <linux/io.h>
23 #include <linux/irq.h>
24 #include <linux/platform_data/i2c-pxa.h>
25 #include <linux/platform_data/mmp_dma.h>
26 #include <linux/soc/pxa/cpu.h>
27
28 #include <asm/mach/map.h>
29 #include <asm/irq.h>
30 #include <asm/suspend.h>
31 #include "irqs.h"
32 #include "pxa27x.h"
33 #include "reset.h"
34 #include <linux/platform_data/usb-ohci-pxa27x.h>
35 #include "pm.h"
36 #include "addr-map.h"
37 #include "smemc.h"
38
39 #include "generic.h"
40 #include "devices.h"
41 #include <linux/clk-provider.h>
42 #include <linux/clkdev.h>
43
pxa27x_clear_otgph(void)44 void pxa27x_clear_otgph(void)
45 {
46 if (cpu_is_pxa27x() && (PSSR & PSSR_OTGPH))
47 PSSR |= PSSR_OTGPH;
48 }
49 EXPORT_SYMBOL(pxa27x_clear_otgph);
50
51 static unsigned long ac97_reset_config[] = {
52 GPIO113_AC97_nRESET_GPIO_HIGH,
53 GPIO113_AC97_nRESET,
54 GPIO95_AC97_nRESET_GPIO_HIGH,
55 GPIO95_AC97_nRESET,
56 };
57
pxa27x_configure_ac97reset(int reset_gpio,bool to_gpio)58 void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio)
59 {
60 /*
61 * This helper function is used to work around a bug in the pxa27x's
62 * ac97 controller during a warm reset. The configuration of the
63 * reset_gpio is changed as follows:
64 * to_gpio == true: configured to generic output gpio and driven high
65 * to_gpio == false: configured to ac97 controller alt fn AC97_nRESET
66 */
67
68 if (reset_gpio == 113)
69 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[0] :
70 &ac97_reset_config[1], 1);
71
72 if (reset_gpio == 95)
73 pxa2xx_mfp_config(to_gpio ? &ac97_reset_config[2] :
74 &ac97_reset_config[3], 1);
75 }
76 EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset);
77
78 #ifdef CONFIG_PM
79
80 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
81 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
82
83 /*
84 * allow platforms to override default PWRMODE setting used for PM_SUSPEND_MEM
85 */
86 static unsigned int pwrmode = PWRMODE_SLEEP;
87
88 /*
89 * List of global PXA peripheral registers to preserve.
90 * More ones like CP and general purpose register values are preserved
91 * with the stack pointer in sleep.S.
92 */
93 enum {
94 SLEEP_SAVE_PSTR,
95 SLEEP_SAVE_MDREFR,
96 SLEEP_SAVE_PCFR,
97 SLEEP_SAVE_COUNT
98 };
99
pxa27x_cpu_pm_save(unsigned long * sleep_save)100 static void pxa27x_cpu_pm_save(unsigned long *sleep_save)
101 {
102 sleep_save[SLEEP_SAVE_MDREFR] = __raw_readl(MDREFR);
103 SAVE(PCFR);
104
105 SAVE(PSTR);
106 }
107
pxa27x_cpu_pm_restore(unsigned long * sleep_save)108 static void pxa27x_cpu_pm_restore(unsigned long *sleep_save)
109 {
110 __raw_writel(sleep_save[SLEEP_SAVE_MDREFR], MDREFR);
111 RESTORE(PCFR);
112
113 PSSR = PSSR_RDH | PSSR_PH;
114
115 RESTORE(PSTR);
116 }
117
pxa27x_cpu_pm_enter(suspend_state_t state)118 static void pxa27x_cpu_pm_enter(suspend_state_t state)
119 {
120 extern void pxa_cpu_standby(void);
121 #ifndef CONFIG_IWMMXT
122 u64 acc0;
123
124 #ifndef CONFIG_AS_IS_LLVM
125 asm volatile(".arch_extension xscale\n\t"
126 "mra %Q0, %R0, acc0" : "=r" (acc0));
127 #else
128 asm volatile("mrrc p0, 0, %Q0, %R0, c0" : "=r" (acc0));
129 #endif
130 #endif
131
132 /* ensure voltage-change sequencer not initiated, which hangs */
133 PCFR &= ~PCFR_FVC;
134
135 /* Clear edge-detect status register. */
136 PEDR = 0xDF12FE1B;
137
138 /* Clear reset status */
139 RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
140
141 switch (state) {
142 case PM_SUSPEND_STANDBY:
143 pxa_cpu_standby();
144 break;
145 case PM_SUSPEND_MEM:
146 cpu_suspend(pwrmode, pxa27x_finish_suspend);
147 #ifndef CONFIG_IWMMXT
148 #ifndef CONFIG_AS_IS_LLVM
149 asm volatile(".arch_extension xscale\n\t"
150 "mar acc0, %Q0, %R0" : "=r" (acc0));
151 #else
152 asm volatile("mcrr p0, 0, %Q0, %R0, c0" :: "r" (acc0));
153 #endif
154 #endif
155 break;
156 }
157 }
158
pxa27x_cpu_pm_valid(suspend_state_t state)159 static int pxa27x_cpu_pm_valid(suspend_state_t state)
160 {
161 return state == PM_SUSPEND_MEM || state == PM_SUSPEND_STANDBY;
162 }
163
pxa27x_cpu_pm_prepare(void)164 static int pxa27x_cpu_pm_prepare(void)
165 {
166 /* set resume return address */
167 PSPR = __pa_symbol(cpu_resume);
168 return 0;
169 }
170
pxa27x_cpu_pm_finish(void)171 static void pxa27x_cpu_pm_finish(void)
172 {
173 /* ensure not to come back here if it wasn't intended */
174 PSPR = 0;
175 }
176
177 static struct pxa_cpu_pm_fns pxa27x_cpu_pm_fns = {
178 .save_count = SLEEP_SAVE_COUNT,
179 .save = pxa27x_cpu_pm_save,
180 .restore = pxa27x_cpu_pm_restore,
181 .valid = pxa27x_cpu_pm_valid,
182 .enter = pxa27x_cpu_pm_enter,
183 .prepare = pxa27x_cpu_pm_prepare,
184 .finish = pxa27x_cpu_pm_finish,
185 };
186
pxa27x_init_pm(void)187 static void __init pxa27x_init_pm(void)
188 {
189 pxa_cpu_pm_fns = &pxa27x_cpu_pm_fns;
190 }
191 #else
pxa27x_init_pm(void)192 static inline void pxa27x_init_pm(void) {}
193 #endif
194
195 /* PXA27x: Various gpios can issue wakeup events. This logic only
196 * handles the simple cases, not the WEMUX2 and WEMUX3 options
197 */
pxa27x_set_wake(struct irq_data * d,unsigned int on)198 static int pxa27x_set_wake(struct irq_data *d, unsigned int on)
199 {
200 int gpio = pxa_irq_to_gpio(d->irq);
201 uint32_t mask;
202
203 if (gpio >= 0 && gpio < 128)
204 return gpio_set_wake(gpio, on);
205
206 if (d->irq == IRQ_KEYPAD)
207 return keypad_set_wake(on);
208
209 switch (d->irq) {
210 case IRQ_RTCAlrm:
211 mask = PWER_RTC;
212 break;
213 case IRQ_USB:
214 mask = 1u << 26;
215 break;
216 default:
217 return -EINVAL;
218 }
219
220 if (on)
221 PWER |= mask;
222 else
223 PWER &=~mask;
224
225 return 0;
226 }
227
pxa27x_init_irq(void)228 void __init pxa27x_init_irq(void)
229 {
230 pxa_init_irq(34, pxa27x_set_wake);
231 }
232
233 static int __init
pxa27x_dt_init_irq(struct device_node * node,struct device_node * parent)234 pxa27x_dt_init_irq(struct device_node *node, struct device_node *parent)
235 {
236 pxa_dt_irq_init(pxa27x_set_wake);
237 set_handle_irq(ichp_handle_irq);
238
239 return 0;
240 }
241 IRQCHIP_DECLARE(pxa27x_intc, "marvell,pxa-intc", pxa27x_dt_init_irq);
242
243 static struct map_desc pxa27x_io_desc[] __initdata = {
244 { /* Mem Ctl */
245 .virtual = (unsigned long)SMEMC_VIRT,
246 .pfn = __phys_to_pfn(PXA2XX_SMEMC_BASE),
247 .length = SMEMC_SIZE,
248 .type = MT_DEVICE
249 }, { /* UNCACHED_PHYS_0 */
250 .virtual = UNCACHED_PHYS_0,
251 .pfn = __phys_to_pfn(0x00000000),
252 .length = UNCACHED_PHYS_0_SIZE,
253 .type = MT_DEVICE
254 },
255 };
256
pxa27x_map_io(void)257 void __init pxa27x_map_io(void)
258 {
259 pxa_map_io();
260 iotable_init(ARRAY_AND_SIZE(pxa27x_io_desc));
261 pxa27x_get_clk_frequency_khz(1);
262 }
263
264 /*
265 * device registration specific to PXA27x.
266 */
pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data * info)267 void __init pxa27x_set_i2c_power_info(struct i2c_pxa_platform_data *info)
268 {
269 local_irq_disable();
270 PCFR |= PCFR_PI2CEN;
271 local_irq_enable();
272 pxa_register_device(&pxa27x_device_i2c_power, info);
273 }
274
275 static struct pxa_gpio_platform_data pxa27x_gpio_info __initdata = {
276 .irq_base = PXA_GPIO_TO_IRQ(0),
277 .gpio_set_wake = gpio_set_wake,
278 };
279
280 static struct platform_device *devices[] __initdata = {
281 &pxa27x_device_udc,
282 &pxa_device_pmu,
283 &pxa_device_i2s,
284 &pxa_device_asoc_ssp1,
285 &pxa_device_asoc_ssp2,
286 &pxa_device_asoc_ssp3,
287 &pxa_device_asoc_platform,
288 &pxa_device_rtc,
289 &pxa27x_device_ssp1,
290 &pxa27x_device_ssp2,
291 &pxa27x_device_ssp3,
292 &pxa27x_device_pwm0,
293 &pxa27x_device_pwm1,
294 };
295
296 static const struct dma_slave_map pxa27x_slave_map[] = {
297 /* PXA25x, PXA27x and PXA3xx common entries */
298 { "pxa2xx-ac97", "pcm_pcm_mic_mono", PDMA_FILTER_PARAM(LOWEST, 8) },
299 { "pxa2xx-ac97", "pcm_pcm_aux_mono_in", PDMA_FILTER_PARAM(LOWEST, 9) },
300 { "pxa2xx-ac97", "pcm_pcm_aux_mono_out",
301 PDMA_FILTER_PARAM(LOWEST, 10) },
302 { "pxa2xx-ac97", "pcm_pcm_stereo_in", PDMA_FILTER_PARAM(LOWEST, 11) },
303 { "pxa2xx-ac97", "pcm_pcm_stereo_out", PDMA_FILTER_PARAM(LOWEST, 12) },
304 { "pxa-ssp-dai.0", "rx", PDMA_FILTER_PARAM(LOWEST, 13) },
305 { "pxa-ssp-dai.0", "tx", PDMA_FILTER_PARAM(LOWEST, 14) },
306 { "pxa-ssp-dai.1", "rx", PDMA_FILTER_PARAM(LOWEST, 15) },
307 { "pxa-ssp-dai.1", "tx", PDMA_FILTER_PARAM(LOWEST, 16) },
308 { "pxa2xx-ir", "rx", PDMA_FILTER_PARAM(LOWEST, 17) },
309 { "pxa2xx-ir", "tx", PDMA_FILTER_PARAM(LOWEST, 18) },
310 { "pxa2xx-mci.0", "rx", PDMA_FILTER_PARAM(LOWEST, 21) },
311 { "pxa2xx-mci.0", "tx", PDMA_FILTER_PARAM(LOWEST, 22) },
312 { "pxa-ssp-dai.2", "rx", PDMA_FILTER_PARAM(LOWEST, 66) },
313 { "pxa-ssp-dai.2", "tx", PDMA_FILTER_PARAM(LOWEST, 67) },
314
315 /* PXA27x specific map */
316 { "pxa2xx-i2s", "rx", PDMA_FILTER_PARAM(LOWEST, 2) },
317 { "pxa2xx-i2s", "tx", PDMA_FILTER_PARAM(LOWEST, 3) },
318 { "pxa27x-camera.0", "CI_Y", PDMA_FILTER_PARAM(HIGHEST, 68) },
319 { "pxa27x-camera.0", "CI_U", PDMA_FILTER_PARAM(HIGHEST, 69) },
320 { "pxa27x-camera.0", "CI_V", PDMA_FILTER_PARAM(HIGHEST, 70) },
321 };
322
323 static struct mmp_dma_platdata pxa27x_dma_pdata = {
324 .dma_channels = 32,
325 .nb_requestors = 75,
326 .slave_map = pxa27x_slave_map,
327 .slave_map_cnt = ARRAY_SIZE(pxa27x_slave_map),
328 };
329
pxa27x_init(void)330 static int __init pxa27x_init(void)
331 {
332 int ret = 0;
333
334 if (cpu_is_pxa27x()) {
335
336 pxa_register_wdt(RCSR);
337
338 pxa27x_init_pm();
339
340 register_syscore_ops(&pxa_irq_syscore_ops);
341 register_syscore_ops(&pxa2xx_mfp_syscore_ops);
342
343 if (!of_have_populated_dt()) {
344 pxa_register_device(&pxa27x_device_gpio,
345 &pxa27x_gpio_info);
346 pxa2xx_set_dmac_info(&pxa27x_dma_pdata);
347 ret = platform_add_devices(devices,
348 ARRAY_SIZE(devices));
349 }
350 }
351
352 return ret;
353 }
354
355 postcore_initcall(pxa27x_init);
356