xref: /openbmc/linux/arch/arm/mach-pxa/spitz_pm.c (revision 0c6dfa75)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Battery and Power Management code for the Sharp SL-Cxx00
4  *
5  * Copyright (c) 2005 Richard Purdie
6  */
7 
8 #include <linux/module.h>
9 #include <linux/stat.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/gpio.h>
14 #include <linux/gpio-pxa.h>
15 #include <linux/interrupt.h>
16 #include <linux/platform_device.h>
17 #include <linux/apm-emulation.h>
18 #include <linux/spi/corgi_lcd.h>
19 
20 #include <asm/irq.h>
21 #include <asm/mach-types.h>
22 
23 #include "spitz.h"
24 #include "pxa27x.h"
25 #include "sharpsl_pm.h"
26 
27 #include "generic.h"
28 
29 #define SHARPSL_CHARGE_ON_VOLT         0x99  /* 2.9V */
30 #define SHARPSL_CHARGE_ON_TEMP         0xe0  /* 2.9V */
31 #define SHARPSL_CHARGE_ON_ACIN_HIGH    0x9b  /* 6V */
32 #define SHARPSL_CHARGE_ON_ACIN_LOW     0x34  /* 2V */
33 #define SHARPSL_FATAL_ACIN_VOLT        182   /* 3.45V */
34 #define SHARPSL_FATAL_NOACIN_VOLT      170   /* 3.40V */
35 
36 static int spitz_last_ac_status;
37 
38 static struct gpio spitz_charger_gpios[] = {
39 	{ SPITZ_GPIO_KEY_INT,	GPIOF_IN, "Keyboard Interrupt" },
40 	{ SPITZ_GPIO_SYNC,	GPIOF_IN, "Sync" },
41 	{ SPITZ_GPIO_AC_IN,     GPIOF_IN, "Charger Detection" },
42 	{ SPITZ_GPIO_ADC_TEMP_ON, GPIOF_OUT_INIT_LOW, "ADC Temp On" },
43 	{ SPITZ_GPIO_JK_B,	  GPIOF_OUT_INIT_LOW, "JK B" },
44 	{ SPITZ_GPIO_CHRG_ON,	  GPIOF_OUT_INIT_LOW, "Charger On" },
45 };
46 
47 static void spitz_charger_init(void)
48 {
49 	gpio_request_array(ARRAY_AND_SIZE(spitz_charger_gpios));
50 }
51 
52 static void spitz_measure_temp(int on)
53 {
54 	gpio_set_value(SPITZ_GPIO_ADC_TEMP_ON, on);
55 }
56 
57 static void spitz_charge(int on)
58 {
59 	if (on) {
60 		if (sharpsl_pm.flags & SHARPSL_SUSPENDED) {
61 			gpio_set_value(SPITZ_GPIO_JK_B, 1);
62 			gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
63 		} else {
64 			gpio_set_value(SPITZ_GPIO_JK_B, 0);
65 			gpio_set_value(SPITZ_GPIO_CHRG_ON, 0);
66 		}
67 	} else {
68 		gpio_set_value(SPITZ_GPIO_JK_B, 0);
69 		gpio_set_value(SPITZ_GPIO_CHRG_ON, 1);
70 	}
71 }
72 
73 static void spitz_discharge(int on)
74 {
75 	gpio_set_value(SPITZ_GPIO_JK_A, on);
76 }
77 
78 /* HACK - For unknown reasons, accurate voltage readings are only made with a load
79    on the power bus which the green led on spitz provides */
80 static void spitz_discharge1(int on)
81 {
82 	gpio_set_value(SPITZ_GPIO_LED_GREEN, on);
83 }
84 
85 static unsigned long gpio18_config = GPIO18_GPIO;
86 
87 static void spitz_presuspend(void)
88 {
89 	spitz_last_ac_status = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
90 
91 	/* GPIO Sleep Register */
92 	PGSR0 = 0x00144018;
93 	PGSR1 = 0x00EF0000;
94 	if (machine_is_akita()) {
95 		PGSR2 = 0x2121C000;
96 		PGSR3 = 0x00600400;
97 	} else {
98 		PGSR2 = 0x0121C000;
99 		PGSR3 = 0x00600000;
100 	}
101 
102 	PGSR0 &= ~SPITZ_GPIO_G0_STROBE_BIT;
103 	PGSR1 &= ~SPITZ_GPIO_G1_STROBE_BIT;
104 	PGSR2 &= ~SPITZ_GPIO_G2_STROBE_BIT;
105 	PGSR3 &= ~SPITZ_GPIO_G3_STROBE_BIT;
106 	PGSR2 |= GPIO_bit(SPITZ_GPIO_KEY_STROBE0);
107 
108 	pxa2xx_mfp_config(&gpio18_config, 1);
109 	gpio_request_one(18, GPIOF_OUT_INIT_HIGH, "Unknown");
110 	gpio_free(18);
111 
112 	PRER = GPIO_bit(SPITZ_GPIO_KEY_INT);
113 	PFER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
114 	PWER = GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET) | PWER_RTC;
115 	PKWR = GPIO_bit(SPITZ_GPIO_SYNC) | GPIO_bit(SPITZ_GPIO_KEY_INT) | GPIO_bit(SPITZ_GPIO_RESET);
116 	PKSR = 0xffffffff; /* clear */
117 
118 	/* nRESET_OUT Disable */
119 	PSLR |= PSLR_SL_ROD;
120 
121 	/* Stop 3.6MHz and drive HIGH to PCMCIA and CS */
122 	PCFR = PCFR_GPR_EN | PCFR_OPDE;
123 }
124 
125 static void spitz_postsuspend(void)
126 {
127 }
128 
129 static int spitz_should_wakeup(unsigned int resume_on_alarm)
130 {
131 	int is_resume = 0;
132 	int acin = sharpsl_pm.machinfo->read_devdata(SHARPSL_STATUS_ACIN);
133 
134 	if (spitz_last_ac_status != acin) {
135 		if (acin) {
136 			/* charge on */
137 			sharpsl_pm.flags |= SHARPSL_DO_OFFLINE_CHRG;
138 			dev_dbg(sharpsl_pm.dev, "AC Inserted\n");
139 		} else {
140 			/* charge off */
141 			dev_dbg(sharpsl_pm.dev, "AC Removed\n");
142 			sharpsl_pm_led(SHARPSL_LED_OFF);
143 			sharpsl_pm.machinfo->charge(0);
144 			sharpsl_pm.charge_mode = CHRG_OFF;
145 		}
146 		spitz_last_ac_status = acin;
147 		/* Return to suspend as this must be what we were woken for */
148 		return 0;
149 	}
150 
151 	if (PEDR & GPIO_bit(SPITZ_GPIO_KEY_INT))
152 		is_resume |= GPIO_bit(SPITZ_GPIO_KEY_INT);
153 
154 	if (PKSR & GPIO_bit(SPITZ_GPIO_SYNC))
155 		is_resume |= GPIO_bit(SPITZ_GPIO_SYNC);
156 
157 	if (resume_on_alarm && (PEDR & PWER_RTC))
158 		is_resume |= PWER_RTC;
159 
160 	dev_dbg(sharpsl_pm.dev, "is_resume: %x\n", is_resume);
161 	return is_resume;
162 }
163 
164 static bool spitz_charger_wakeup(void)
165 {
166 	return !gpio_get_value(SPITZ_GPIO_KEY_INT) ||
167 		gpio_get_value(SPITZ_GPIO_SYNC);
168 }
169 
170 static unsigned long spitzpm_read_devdata(int type)
171 {
172 	switch (type) {
173 	case SHARPSL_STATUS_ACIN:
174 		return !gpio_get_value(SPITZ_GPIO_AC_IN);
175 	case SHARPSL_STATUS_LOCK:
176 		return gpio_get_value(sharpsl_pm.machinfo->gpio_batlock);
177 	case SHARPSL_STATUS_CHRGFULL:
178 		return gpio_get_value(sharpsl_pm.machinfo->gpio_batfull);
179 	case SHARPSL_STATUS_FATAL:
180 		return gpio_get_value(sharpsl_pm.machinfo->gpio_fatal);
181 	case SHARPSL_ACIN_VOLT:
182 		return sharpsl_pm_pxa_read_max1111(MAX1111_ACIN_VOLT);
183 	case SHARPSL_BATT_TEMP:
184 		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_TEMP);
185 	case SHARPSL_BATT_VOLT:
186 	default:
187 		return sharpsl_pm_pxa_read_max1111(MAX1111_BATT_VOLT);
188 	}
189 }
190 
191 struct sharpsl_charger_machinfo spitz_pm_machinfo = {
192 	.init             = spitz_charger_init,
193 	.exit             = NULL,
194 	.gpio_batlock     = SPITZ_GPIO_BAT_COVER,
195 	.gpio_acin        = SPITZ_GPIO_AC_IN,
196 	.gpio_batfull     = SPITZ_GPIO_CHRG_FULL,
197 	.batfull_irq	  = 1,
198 	.gpio_fatal       = SPITZ_GPIO_FATAL_BAT,
199 	.discharge        = spitz_discharge,
200 	.discharge1       = spitz_discharge1,
201 	.charge           = spitz_charge,
202 	.measure_temp     = spitz_measure_temp,
203 	.presuspend       = spitz_presuspend,
204 	.postsuspend      = spitz_postsuspend,
205 	.read_devdata     = spitzpm_read_devdata,
206 	.charger_wakeup   = spitz_charger_wakeup,
207 	.should_wakeup    = spitz_should_wakeup,
208 #if defined(CONFIG_LCD_CORGI)
209 	.backlight_limit = corgi_lcd_limit_intensity,
210 #endif
211 	.charge_on_volt	  = SHARPSL_CHARGE_ON_VOLT,
212 	.charge_on_temp	  = SHARPSL_CHARGE_ON_TEMP,
213 	.charge_acin_high = SHARPSL_CHARGE_ON_ACIN_HIGH,
214 	.charge_acin_low  = SHARPSL_CHARGE_ON_ACIN_LOW,
215 	.fatal_acin_volt  = SHARPSL_FATAL_ACIN_VOLT,
216 	.fatal_noacin_volt= SHARPSL_FATAL_NOACIN_VOLT,
217 	.bat_levels       = 40,
218 	.bat_levels_noac  = sharpsl_battery_levels_noac,
219 	.bat_levels_acin  = sharpsl_battery_levels_acin,
220 	.status_high_acin = 188,
221 	.status_low_acin  = 178,
222 	.status_high_noac = 185,
223 	.status_low_noac  = 175,
224 };
225 
226 static struct platform_device *spitzpm_device;
227 
228 static int spitzpm_init(void)
229 {
230 	int ret;
231 
232 	if (!machine_is_spitz() && !machine_is_akita()
233 			&& !machine_is_borzoi())
234 		return -ENODEV;
235 
236 	spitzpm_device = platform_device_alloc("sharpsl-pm", -1);
237 	if (!spitzpm_device)
238 		return -ENOMEM;
239 
240 	spitzpm_device->dev.platform_data = &spitz_pm_machinfo;
241 	ret = platform_device_add(spitzpm_device);
242 
243 	if (ret)
244 		platform_device_put(spitzpm_device);
245 
246 	return ret;
247 }
248 
249 static void spitzpm_exit(void)
250 {
251 	platform_device_unregister(spitzpm_device);
252 }
253 
254 module_init(spitzpm_init);
255 module_exit(spitzpm_exit);
256