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6#include <common.h>
7#include <dm.h>
8#include <errno.h>
9#include <led.h>
10#include <log.h>
11#include <asm/io.h>
12#include <dm/lists.h>
13
14#define LEDS_MAX 24
15
16
17#define LED_INIT_REG 0x00
18#define LED_INIT_FASTINTV_MS 20
19#define LED_INIT_FASTINTV_SHIFT 6
20#define LED_INIT_FASTINTV_MASK (0x3f << LED_INIT_FASTINTV_SHIFT)
21#define LED_INIT_SLEDEN_SHIFT 12
22#define LED_INIT_SLEDEN_MASK (1 << LED_INIT_SLEDEN_SHIFT)
23#define LED_INIT_SLEDMUX_SHIFT 13
24#define LED_INIT_SLEDMUX_MASK (1 << LED_INIT_SLEDMUX_SHIFT)
25#define LED_INIT_SLEDCLKNPOL_SHIFT 14
26#define LED_INIT_SLEDCLKNPOL_MASK (1 << LED_INIT_SLEDCLKNPOL_SHIFT)
27#define LED_INIT_SLEDDATAPPOL_SHIFT 15
28#define LED_INIT_SLEDDATANPOL_MASK (1 << LED_INIT_SLEDDATAPPOL_SHIFT)
29#define LED_INIT_SLEDSHIFTDIR_SHIFT 16
30#define LED_INIT_SLEDSHIFTDIR_MASK (1 << LED_INIT_SLEDSHIFTDIR_SHIFT)
31
32
33#define LED_MODE_REG_HI 0x04
34#define LED_MODE_REG_LO 0x08
35#define LED_MODE_ON 0
36#define LED_MODE_FAST 1
37#define LED_MODE_BLINK 2
38#define LED_MODE_OFF 3
39#define LED_MODE_MASK 0x3
40
41struct bcm6328_led_priv {
42 void __iomem *regs;
43 void __iomem *mode;
44 uint8_t shift;
45 bool active_low;
46};
47
48static unsigned long bcm6328_led_get_mode(struct bcm6328_led_priv *priv)
49{
50 return ((readl_be(priv->mode) >> priv->shift) & LED_MODE_MASK);
51}
52
53static int bcm6328_led_set_mode(struct bcm6328_led_priv *priv, uint8_t mode)
54{
55 clrsetbits_be32(priv->mode, (LED_MODE_MASK << priv->shift),
56 (mode << priv->shift));
57
58 return 0;
59}
60
61static enum led_state_t bcm6328_led_get_state(struct udevice *dev)
62{
63 struct bcm6328_led_priv *priv = dev_get_priv(dev);
64 enum led_state_t state = LEDST_OFF;
65
66 switch (bcm6328_led_get_mode(priv)) {
67#ifdef CONFIG_LED_BLINK
68 case LED_MODE_BLINK:
69 case LED_MODE_FAST:
70 state = LEDST_BLINK;
71 break;
72#endif
73 case LED_MODE_OFF:
74 state = (priv->active_low ? LEDST_ON : LEDST_OFF);
75 break;
76 case LED_MODE_ON:
77 state = (priv->active_low ? LEDST_OFF : LEDST_ON);
78 break;
79 }
80
81 return state;
82}
83
84static int bcm6328_led_set_state(struct udevice *dev, enum led_state_t state)
85{
86 struct bcm6328_led_priv *priv = dev_get_priv(dev);
87 unsigned long mode;
88
89 switch (state) {
90#ifdef CONFIG_LED_BLINK
91 case LEDST_BLINK:
92 mode = LED_MODE_BLINK;
93 break;
94#endif
95 case LEDST_OFF:
96 mode = (priv->active_low ? LED_MODE_ON : LED_MODE_OFF);
97 break;
98 case LEDST_ON:
99 mode = (priv->active_low ? LED_MODE_OFF : LED_MODE_ON);
100 break;
101 case LEDST_TOGGLE:
102 if (bcm6328_led_get_state(dev) == LEDST_OFF)
103 return bcm6328_led_set_state(dev, LEDST_ON);
104 else
105 return bcm6328_led_set_state(dev, LEDST_OFF);
106 break;
107 default:
108 return -ENOSYS;
109 }
110
111 return bcm6328_led_set_mode(priv, mode);
112}
113
114#ifdef CONFIG_LED_BLINK
115static unsigned long bcm6328_blink_delay(int delay)
116{
117 unsigned long bcm6328_delay = delay;
118
119 bcm6328_delay += (LED_INIT_FASTINTV_MS / 2);
120 bcm6328_delay /= LED_INIT_FASTINTV_MS;
121 bcm6328_delay <<= LED_INIT_FASTINTV_SHIFT;
122
123 if (bcm6328_delay > LED_INIT_FASTINTV_MASK)
124 return LED_INIT_FASTINTV_MASK;
125 else
126 return bcm6328_delay;
127}
128
129static int bcm6328_led_set_period(struct udevice *dev, int period_ms)
130{
131 struct bcm6328_led_priv *priv = dev_get_priv(dev);
132
133 clrsetbits_be32(priv->regs + LED_INIT_REG, LED_INIT_FASTINTV_MASK,
134 bcm6328_blink_delay(period_ms));
135
136 return 0;
137}
138#endif
139
140static const struct led_ops bcm6328_led_ops = {
141 .get_state = bcm6328_led_get_state,
142 .set_state = bcm6328_led_set_state,
143#ifdef CONFIG_LED_BLINK
144 .set_period = bcm6328_led_set_period,
145#endif
146};
147
148static int bcm6328_led_probe(struct udevice *dev)
149{
150 struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
151
152
153 if (!uc_plat->label) {
154 void __iomem *regs;
155 u32 set_bits = 0;
156
157 regs = dev_remap_addr(dev);
158 if (!regs)
159 return -EINVAL;
160
161 if (dev_read_bool(dev, "brcm,serial-leds"))
162 set_bits |= LED_INIT_SLEDEN_MASK;
163 if (dev_read_bool(dev, "brcm,serial-mux"))
164 set_bits |= LED_INIT_SLEDMUX_MASK;
165 if (dev_read_bool(dev, "brcm,serial-clk-low"))
166 set_bits |= LED_INIT_SLEDCLKNPOL_MASK;
167 if (!dev_read_bool(dev, "brcm,serial-dat-low"))
168 set_bits |= LED_INIT_SLEDDATANPOL_MASK;
169 if (!dev_read_bool(dev, "brcm,serial-shift-inv"))
170 set_bits |= LED_INIT_SLEDSHIFTDIR_MASK;
171
172 clrsetbits_be32(regs + LED_INIT_REG, ~0, set_bits);
173 } else {
174 struct bcm6328_led_priv *priv = dev_get_priv(dev);
175 unsigned int pin;
176
177 priv->regs = dev_remap_addr(dev_get_parent(dev));
178 if (!priv->regs)
179 return -EINVAL;
180
181 pin = dev_read_u32_default(dev, "reg", LEDS_MAX);
182 if (pin >= LEDS_MAX)
183 return -EINVAL;
184
185 if (pin < 8) {
186
187 priv->mode = priv->regs + LED_MODE_REG_HI;
188 priv->shift = (pin << 1);
189 } else {
190
191 priv->mode = priv->regs + LED_MODE_REG_LO;
192 priv->shift = ((pin - 8) << 1);
193 }
194
195 if (dev_read_bool(dev, "active-low"))
196 priv->active_low = true;
197 }
198
199 return 0;
200}
201
202static int bcm6328_led_bind(struct udevice *parent)
203{
204 ofnode node;
205
206 dev_for_each_subnode(node, parent) {
207 struct led_uc_plat *uc_plat;
208 struct udevice *dev;
209 const char *label;
210 int ret;
211
212 label = ofnode_read_string(node, "label");
213 if (!label) {
214 debug("%s: node %s has no label\n", __func__,
215 ofnode_get_name(node));
216 return -EINVAL;
217 }
218
219 ret = device_bind_driver_to_node(parent, "bcm6328-led",
220 ofnode_get_name(node),
221 node, &dev);
222 if (ret)
223 return ret;
224
225 uc_plat = dev_get_uclass_plat(dev);
226 uc_plat->label = label;
227 }
228
229 return 0;
230}
231
232static const struct udevice_id bcm6328_led_ids[] = {
233 { .compatible = "brcm,bcm6328-leds" },
234 { }
235};
236
237U_BOOT_DRIVER(bcm6328_led) = {
238 .name = "bcm6328-led",
239 .id = UCLASS_LED,
240 .of_match = bcm6328_led_ids,
241 .ops = &bcm6328_led_ops,
242 .bind = bcm6328_led_bind,
243 .probe = bcm6328_led_probe,
244 .priv_auto = sizeof(struct bcm6328_led_priv),
245};
246
