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16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/types.h>
19#include <linux/irq.h>
20#include <asm/txx9irq.h>
21
22struct txx9_irc_reg {
23 u32 cer;
24 u32 cr[2];
25 u32 unused0;
26 u32 ilr[8];
27 u32 unused1[4];
28 u32 imr;
29 u32 unused2[7];
30 u32 scr;
31 u32 unused3[7];
32 u32 ssr;
33 u32 unused4[7];
34 u32 csr;
35};
36
37
38#define TXx9_IRCER_ICE 0x00000001
39
40
41#define TXx9_IRCR_LOW 0x00000000
42#define TXx9_IRCR_HIGH 0x00000001
43#define TXx9_IRCR_DOWN 0x00000002
44#define TXx9_IRCR_UP 0x00000003
45#define TXx9_IRCR_EDGE(cr) ((cr) & 0x00000002)
46
47
48#define TXx9_IRSCR_EIClrE 0x00000100
49#define TXx9_IRSCR_EIClr_MASK 0x0000000f
50
51
52#define TXx9_IRCSR_IF 0x00010000
53#define TXx9_IRCSR_ILV_MASK 0x00000700
54#define TXx9_IRCSR_IVL_MASK 0x0000001f
55
56#define irc_dlevel 0
57#define irc_elevel 1
58
59static struct txx9_irc_reg __iomem *txx9_ircptr __read_mostly;
60
61static struct {
62 unsigned char level;
63 unsigned char mode;
64} txx9irq[TXx9_MAX_IR] __read_mostly;
65
66static void txx9_irq_unmask(struct irq_data *d)
67{
68 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
69 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16 ) / 2];
70 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
71
72 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
73 | (txx9irq[irq_nr].level << ofs),
74 ilrp);
75#ifdef CONFIG_CPU_TX39XX
76
77 __raw_writel(0, &txx9_ircptr->imr);
78 __raw_writel(irc_elevel, &txx9_ircptr->imr);
79#endif
80}
81
82static inline void txx9_irq_mask(struct irq_data *d)
83{
84 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
85 u32 __iomem *ilrp = &txx9_ircptr->ilr[(irq_nr % 16) / 2];
86 int ofs = irq_nr / 16 * 16 + (irq_nr & 1) * 8;
87
88 __raw_writel((__raw_readl(ilrp) & ~(0xff << ofs))
89 | (irc_dlevel << ofs),
90 ilrp);
91#ifdef CONFIG_CPU_TX39XX
92
93 __raw_writel(0, &txx9_ircptr->imr);
94 __raw_writel(irc_elevel, &txx9_ircptr->imr);
95
96 __raw_readl(&txx9_ircptr->ssr);
97#else
98 mmiowb();
99#endif
100}
101
102static void txx9_irq_mask_ack(struct irq_data *d)
103{
104 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
105
106 txx9_irq_mask(d);
107
108 if (unlikely(TXx9_IRCR_EDGE(txx9irq[irq_nr].mode)))
109 __raw_writel(TXx9_IRSCR_EIClrE | irq_nr, &txx9_ircptr->scr);
110}
111
112static int txx9_irq_set_type(struct irq_data *d, unsigned int flow_type)
113{
114 unsigned int irq_nr = d->irq - TXX9_IRQ_BASE;
115 u32 cr;
116 u32 __iomem *crp;
117 int ofs;
118 int mode;
119
120 if (flow_type & IRQF_TRIGGER_PROBE)
121 return 0;
122 switch (flow_type & IRQF_TRIGGER_MASK) {
123 case IRQF_TRIGGER_RISING: mode = TXx9_IRCR_UP; break;
124 case IRQF_TRIGGER_FALLING: mode = TXx9_IRCR_DOWN; break;
125 case IRQF_TRIGGER_HIGH: mode = TXx9_IRCR_HIGH; break;
126 case IRQF_TRIGGER_LOW: mode = TXx9_IRCR_LOW; break;
127 default:
128 return -EINVAL;
129 }
130 crp = &txx9_ircptr->cr[(unsigned int)irq_nr / 8];
131 cr = __raw_readl(crp);
132 ofs = (irq_nr & (8 - 1)) * 2;
133 cr &= ~(0x3 << ofs);
134 cr |= (mode & 0x3) << ofs;
135 __raw_writel(cr, crp);
136 txx9irq[irq_nr].mode = mode;
137 return 0;
138}
139
140static struct irq_chip txx9_irq_chip = {
141 .name = "TXX9",
142 .irq_ack = txx9_irq_mask_ack,
143 .irq_mask = txx9_irq_mask,
144 .irq_mask_ack = txx9_irq_mask_ack,
145 .irq_unmask = txx9_irq_unmask,
146 .irq_set_type = txx9_irq_set_type,
147};
148
149void __init txx9_irq_init(unsigned long baseaddr)
150{
151 int i;
152
153 txx9_ircptr = ioremap(baseaddr, sizeof(struct txx9_irc_reg));
154 for (i = 0; i < TXx9_MAX_IR; i++) {
155 txx9irq[i].level = 4;
156 txx9irq[i].mode = TXx9_IRCR_LOW;
157 irq_set_chip_and_handler(TXX9_IRQ_BASE + i, &txx9_irq_chip,
158 handle_level_irq);
159 }
160
161
162 __raw_writel(0, &txx9_ircptr->imr);
163 for (i = 0; i < 8; i++)
164 __raw_writel(0, &txx9_ircptr->ilr[i]);
165
166 for (i = 0; i < 2; i++)
167 __raw_writel(0, &txx9_ircptr->cr[i]);
168
169 __raw_writel(TXx9_IRCER_ICE, &txx9_ircptr->cer);
170 __raw_writel(irc_elevel, &txx9_ircptr->imr);
171}
172
173int __init txx9_irq_set_pri(int irc_irq, int new_pri)
174{
175 int old_pri;
176
177 if ((unsigned int)irc_irq >= TXx9_MAX_IR)
178 return 0;
179 old_pri = txx9irq[irc_irq].level;
180 txx9irq[irc_irq].level = new_pri;
181 return old_pri;
182}
183
184int txx9_irq(void)
185{
186 u32 csr = __raw_readl(&txx9_ircptr->csr);
187
188 if (likely(!(csr & TXx9_IRCSR_IF)))
189 return TXX9_IRQ_BASE + (csr & (TXx9_MAX_IR - 1));
190 return -1;
191}
192
