1 /*
2 * linux/arch/arm/mach-w90x900/cpu.c
3 *
4 * Copyright (c) 2009 Nuvoton corporation.
5 *
6 * Wan ZongShun <mcuos.com@gmail.com>
7 *
8 * NUC900 series cpu common support
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 as published by
12 * the Free Software Foundation;version 2 of the License.
13 *
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/interrupt.h>
19 #include <linux/list.h>
20 #include <linux/timer.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/io.h>
24 #include <linux/serial_8250.h>
25 #include <linux/delay.h>
26
27 #include <asm/mach/arch.h>
28 #include <asm/mach/map.h>
29 #include <asm/mach/irq.h>
30 #include <asm/irq.h>
31 #include <asm/system_misc.h>
32
33 #include <mach/hardware.h>
34 #include <mach/regs-serial.h>
35 #include <mach/regs-clock.h>
36 #include <mach/regs-ebi.h>
37 #include <mach/regs-timer.h>
38
39 #include "cpu.h"
40 #include "clock.h"
41 #include "nuc9xx.h"
42
43 /* Initial IO mappings */
44
45 static struct map_desc nuc900_iodesc[] __initdata = {
46 IODESC_ENT(IRQ),
47 IODESC_ENT(GCR),
48 IODESC_ENT(UART),
49 IODESC_ENT(TIMER),
50 IODESC_ENT(EBI),
51 IODESC_ENT(GPIO),
52 };
53
54 /* Initial clock declarations. */
55 static DEFINE_CLK(lcd, 0);
56 static DEFINE_CLK(audio, 1);
57 static DEFINE_CLK(fmi, 4);
58 static DEFINE_SUBCLK(ms, 0);
59 static DEFINE_SUBCLK(sd, 1);
60 static DEFINE_CLK(dmac, 5);
61 static DEFINE_CLK(atapi, 6);
62 static DEFINE_CLK(emc, 7);
63 static DEFINE_SUBCLK(rmii, 2);
64 static DEFINE_CLK(usbd, 8);
65 static DEFINE_CLK(usbh, 9);
66 static DEFINE_CLK(g2d, 10);
67 static DEFINE_CLK(pwm, 18);
68 static DEFINE_CLK(ps2, 24);
69 static DEFINE_CLK(kpi, 25);
70 static DEFINE_CLK(wdt, 26);
71 static DEFINE_CLK(gdma, 27);
72 static DEFINE_CLK(adc, 28);
73 static DEFINE_CLK(usi, 29);
74 static DEFINE_CLK(ext, 0);
75 static DEFINE_CLK(timer0, 19);
76 static DEFINE_CLK(timer1, 20);
77 static DEFINE_CLK(timer2, 21);
78 static DEFINE_CLK(timer3, 22);
79 static DEFINE_CLK(timer4, 23);
80
81 static struct clk_lookup nuc900_clkregs[] = {
82 DEF_CLKLOOK(&clk_lcd, "nuc900-lcd", NULL),
83 DEF_CLKLOOK(&clk_audio, "nuc900-ac97", NULL),
84 DEF_CLKLOOK(&clk_fmi, "nuc900-fmi", NULL),
85 DEF_CLKLOOK(&clk_ms, "nuc900-fmi", "MS"),
86 DEF_CLKLOOK(&clk_sd, "nuc900-fmi", "SD"),
87 DEF_CLKLOOK(&clk_dmac, "nuc900-dmac", NULL),
88 DEF_CLKLOOK(&clk_atapi, "nuc900-atapi", NULL),
89 DEF_CLKLOOK(&clk_emc, "nuc900-emc", NULL),
90 DEF_CLKLOOK(&clk_rmii, "nuc900-emc", "RMII"),
91 DEF_CLKLOOK(&clk_usbd, "nuc900-usbd", NULL),
92 DEF_CLKLOOK(&clk_usbh, "nuc900-usbh", NULL),
93 DEF_CLKLOOK(&clk_g2d, "nuc900-g2d", NULL),
94 DEF_CLKLOOK(&clk_pwm, "nuc900-pwm", NULL),
95 DEF_CLKLOOK(&clk_ps2, "nuc900-ps2", NULL),
96 DEF_CLKLOOK(&clk_kpi, "nuc900-kpi", NULL),
97 DEF_CLKLOOK(&clk_wdt, "nuc900-wdt", NULL),
98 DEF_CLKLOOK(&clk_gdma, "nuc900-gdma", NULL),
99 DEF_CLKLOOK(&clk_adc, "nuc900-ts", NULL),
100 DEF_CLKLOOK(&clk_usi, "nuc900-spi", NULL),
101 DEF_CLKLOOK(&clk_ext, NULL, "ext"),
102 DEF_CLKLOOK(&clk_timer0, NULL, "timer0"),
103 DEF_CLKLOOK(&clk_timer1, NULL, "timer1"),
104 DEF_CLKLOOK(&clk_timer2, NULL, "timer2"),
105 DEF_CLKLOOK(&clk_timer3, NULL, "timer3"),
106 DEF_CLKLOOK(&clk_timer4, NULL, "timer4"),
107 };
108
109 /* Initial serial platform data */
110
111 struct plat_serial8250_port nuc900_uart_data[] = {
112 NUC900_8250PORT(UART0),
113 {},
114 };
115
116 struct platform_device nuc900_serial_device = {
117 .name = "serial8250",
118 .id = PLAT8250_DEV_PLATFORM,
119 .dev = {
120 .platform_data = nuc900_uart_data,
121 },
122 };
123
124 /*Set NUC900 series cpu frequence*/
nuc900_set_clkval(unsigned int cpufreq)125 static int __init nuc900_set_clkval(unsigned int cpufreq)
126 {
127 unsigned int pllclk, ahbclk, apbclk, val;
128
129 pllclk = 0;
130 ahbclk = 0;
131 apbclk = 0;
132
133 switch (cpufreq) {
134 case 66:
135 pllclk = PLL_66MHZ;
136 ahbclk = AHB_CPUCLK_1_1;
137 apbclk = APB_AHB_1_2;
138 break;
139
140 case 100:
141 pllclk = PLL_100MHZ;
142 ahbclk = AHB_CPUCLK_1_1;
143 apbclk = APB_AHB_1_2;
144 break;
145
146 case 120:
147 pllclk = PLL_120MHZ;
148 ahbclk = AHB_CPUCLK_1_2;
149 apbclk = APB_AHB_1_2;
150 break;
151
152 case 166:
153 pllclk = PLL_166MHZ;
154 ahbclk = AHB_CPUCLK_1_2;
155 apbclk = APB_AHB_1_2;
156 break;
157
158 case 200:
159 pllclk = PLL_200MHZ;
160 ahbclk = AHB_CPUCLK_1_2;
161 apbclk = APB_AHB_1_2;
162 break;
163 }
164
165 __raw_writel(pllclk, REG_PLLCON0);
166
167 val = __raw_readl(REG_CLKDIV);
168 val &= ~(0x03 << 24 | 0x03 << 26);
169 val |= (ahbclk << 24 | apbclk << 26);
170 __raw_writel(val, REG_CLKDIV);
171
172 return 0;
173 }
nuc900_set_cpufreq(char * str)174 static int __init nuc900_set_cpufreq(char *str)
175 {
176 unsigned long cpufreq, val;
177
178 if (!*str)
179 return 0;
180
181 if (kstrtoul(str, 0, &cpufreq))
182 return 0;
183
184 nuc900_clock_source(NULL, "ext");
185
186 nuc900_set_clkval(cpufreq);
187
188 mdelay(1);
189
190 val = __raw_readl(REG_CKSKEW);
191 val &= ~0xff;
192 val |= DEFAULTSKEW;
193 __raw_writel(val, REG_CKSKEW);
194
195 nuc900_clock_source(NULL, "pll0");
196
197 return 1;
198 }
199
200 __setup("cpufreq=", nuc900_set_cpufreq);
201
202 /*Init NUC900 evb io*/
203
nuc900_map_io(struct map_desc * mach_desc,int mach_size)204 void __init nuc900_map_io(struct map_desc *mach_desc, int mach_size)
205 {
206 unsigned long idcode = 0x0;
207
208 iotable_init(mach_desc, mach_size);
209 iotable_init(nuc900_iodesc, ARRAY_SIZE(nuc900_iodesc));
210
211 idcode = __raw_readl(NUC900PDID);
212 if (idcode == NUC910_CPUID)
213 printk(KERN_INFO "CPU type 0x%08lx is NUC910\n", idcode);
214 else if (idcode == NUC920_CPUID)
215 printk(KERN_INFO "CPU type 0x%08lx is NUC920\n", idcode);
216 else if (idcode == NUC950_CPUID)
217 printk(KERN_INFO "CPU type 0x%08lx is NUC950\n", idcode);
218 else if (idcode == NUC960_CPUID)
219 printk(KERN_INFO "CPU type 0x%08lx is NUC960\n", idcode);
220 }
221
222 /*Init NUC900 clock*/
223
nuc900_init_clocks(void)224 void __init nuc900_init_clocks(void)
225 {
226 clkdev_add_table(nuc900_clkregs, ARRAY_SIZE(nuc900_clkregs));
227 }
228
229 #define WTCR (TMR_BA + 0x1C)
230 #define WTCLK (1 << 10)
231 #define WTE (1 << 7)
232 #define WTRE (1 << 1)
233
nuc9xx_restart(enum reboot_mode mode,const char * cmd)234 void nuc9xx_restart(enum reboot_mode mode, const char *cmd)
235 {
236 if (mode == REBOOT_SOFT) {
237 /* Jump into ROM at address 0 */
238 soft_restart(0);
239 } else {
240 __raw_writel(WTE | WTRE | WTCLK, WTCR);
241 }
242 }
243