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cpu-h7202.c
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1 /*
2  * linux/arch/arm/mach-h720x/cpu-h7202.c
3  *
4  * Copyright (C) 2003 Thomas Gleixner <[email protected]>
5  * 2003 Robert Schwebel <[email protected]>
6  * 2004 Sascha Hauer <[email protected]>
7  *
8  * processor specific stuff for the Hynix h7202
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  */
15 
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/module.h>
19 #include <asm/types.h>
20 #include <mach/hardware.h>
21 #include <asm/irq.h>
22 #include <mach/irqs.h>
23 #include <asm/mach/irq.h>
24 #include <asm/mach/time.h>
25 #include <linux/device.h>
26 #include <linux/serial_8250.h>
27 #include "common.h"
28 
29 static struct resource h7202ps2_resources[] = {
30  [0] = {
31  .start = 0x8002c000,
32  .end = 0x8002c040,
33  .flags = IORESOURCE_MEM,
34  },
35  [1] = {
36  .start = IRQ_PS2,
37  .end = IRQ_PS2,
38  .flags = IORESOURCE_IRQ,
39  },
40 };
41 
42 static struct platform_device h7202ps2_device = {
43  .name = "h7202ps2",
44  .id = -1,
45  .num_resources = ARRAY_SIZE(h7202ps2_resources),
46  .resource = h7202ps2_resources,
47 };
48 
49 static struct plat_serial8250_port serial_platform_data[] = {
50  {
51  .membase = (void*)SERIAL0_VIRT,
53  .irq = IRQ_UART0,
54  .uartclk = 2*1843200,
55  .regshift = 2,
56  .iotype = UPIO_MEM,
58  },
59  {
60  .membase = (void*)SERIAL1_VIRT,
62  .irq = IRQ_UART1,
63  .uartclk = 2*1843200,
64  .regshift = 2,
65  .iotype = UPIO_MEM,
67  },
68 #ifdef CONFIG_H7202_SERIAL23
69  {
70  .membase = (void*)SERIAL2_VIRT,
72  .irq = IRQ_UART2,
73  .uartclk = 2*1843200,
74  .regshift = 2,
75  .iotype = UPIO_MEM,
77  },
78  {
79  .membase = (void*)SERIAL3_VIRT,
81  .irq = IRQ_UART3,
82  .uartclk = 2*1843200,
83  .regshift = 2,
84  .iotype = UPIO_MEM,
86  },
87 #endif
88  { },
89 };
90 
91 static struct platform_device serial_device = {
92  .name = "serial8250",
94  .dev = {
95  .platform_data = serial_platform_data,
96  },
97 };
98 
99 static struct platform_device *devices[] __initdata = {
100  &h7202ps2_device,
101  &serial_device,
102 };
103 
104 /* Although we have two interrupt lines for the timers, we only have one
105  * status register which clears all pending timer interrupts on reading. So
106  * we have to handle all timer interrupts in one place.
107  */
108 static void
109 h7202_timerx_demux_handler(unsigned int irq_unused, struct irq_desc *desc)
110 {
111  unsigned int mask, irq;
112 
113  mask = CPU_REG (TIMER_VIRT, TIMER_TOPSTAT);
114 
115  if ( mask & TSTAT_T0INT ) {
116  timer_tick();
117  if( mask == TSTAT_T0INT )
118  return;
119  }
120 
121  mask >>= 1;
122  irq = IRQ_TIMER1;
123  while (mask) {
124  if (mask & 1)
125  generic_handle_irq(irq);
126  irq++;
127  mask >>= 1;
128  }
129 }
130 
131 /*
132  * Timer interrupt handler
133  */
134 static irqreturn_t
135 h7202_timer_interrupt(int irq, void *dev_id)
136 {
137  h7202_timerx_demux_handler(0, NULL);
138  return IRQ_HANDLED;
139 }
140 
141 /*
142  * mask multiplexed timer IRQs
143  */
144 static void inline __mask_timerx_irq(unsigned int irq)
145 {
146  unsigned int bit;
147  bit = 2 << ((irq == IRQ_TIMER64B) ? 4 : (irq - IRQ_TIMER1));
148  CPU_REG (TIMER_VIRT, TIMER_TOPCTRL) &= ~bit;
149 }
150 
151 static void inline mask_timerx_irq(struct irq_data *d)
152 {
153  __mask_timerx_irq(d->irq);
154 }
155 
156 /*
157  * unmask multiplexed timer IRQs
158  */
159 static void inline unmask_timerx_irq(struct irq_data *d)
160 {
161  unsigned int bit;
162  bit = 2 << ((d->irq == IRQ_TIMER64B) ? 4 : (d->irq - IRQ_TIMER1));
164 }
165 
166 static struct irq_chip h7202_timerx_chip = {
167  .irq_ack = mask_timerx_irq,
168  .irq_mask = mask_timerx_irq,
169  .irq_unmask = unmask_timerx_irq,
170 };
171 
172 static struct irqaction h7202_timer_irq = {
173  .name = "h7202 Timer Tick",
175  .handler = h7202_timer_interrupt,
176 };
177 
178 /*
179  * Setup TIMER0 as system timer
180  */
182 {
187 
188  setup_irq(IRQ_TIMER0, &h7202_timer_irq);
189 }
190 
192  .init = h7202_init_time,
193  .offset = h720x_gettimeoffset,
194 };
195 
197 {
198  int irq;
199 
200  CPU_REG (GPIO_E_VIRT, GPIO_MASK) = 0x0;
201 
202  for (irq = IRQ_TIMER1;
203  irq < IRQ_CHAINED_TIMERX(NR_TIMERX_IRQS); irq++) {
204  __mask_timerx_irq(irq);
205  irq_set_chip_and_handler(irq, &h7202_timerx_chip,
207  set_irq_flags(irq, IRQF_VALID );
208  }
209  irq_set_chained_handler(IRQ_TIMERX, h7202_timerx_demux_handler);
210 
211  h720x_init_irq();
212 }
213 
215 {
216  /* Enable clocks */
218 
221 #ifdef CONFIG_H7202_SERIAL23
226 #endif
228 }