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1 /*
2  * Copyright (C) 2006 Atmel Corporation
3  *
4  * See file CREDITS for list of people who contributed to this
5  * project.
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License as
9  * published by the Free Software Foundation; either version 2 of
10  * the License, or (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20  * MA 02111-1307 USA
21  */
22 #ifndef __ASM_AVR32_ARCH_CLK_H__
23 #define __ASM_AVR32_ARCH_CLK_H__
24
25 #include <asm/arch/chip-features.h>
26 #include <asm/arch/portmux.h>
27
28 #ifdef CONFIG_PLL
29 #define PLL0_RATE       ((CONFIG_SYS_OSC0_HZ / CONFIG_SYS_PLL0_DIV)     \
30                                 * CONFIG_SYS_PLL0_MUL)
31 #define MAIN_CLK_RATE   PLL0_RATE
32 #else
33 #define MAIN_CLK_RATE   (CONFIG_SYS_OSC0_HZ)
34 #endif
35
36 static inline unsigned long get_cpu_clk_rate(void)
37 {
38         return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_CPU;
39 }
40 static inline unsigned long get_hsb_clk_rate(void)
41 {
42         return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_HSB;
43 }
44 static inline unsigned long get_pba_clk_rate(void)
45 {
46         return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_PBA;
47 }
48 static inline unsigned long get_pbb_clk_rate(void)
49 {
50         return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_PBB;
51 }
52
53 /* Accessors for specific devices. More will be added as needed. */
54 static inline unsigned long get_sdram_clk_rate(void)
55 {
56         return get_hsb_clk_rate();
57 }
58 #ifdef AT32AP700x_CHIP_HAS_USART
59 static inline unsigned long get_usart_clk_rate(unsigned int dev_id)
60 {
61         return get_pba_clk_rate();
62 }
63 #endif
64 #ifdef AT32AP700x_CHIP_HAS_MACB
65 static inline unsigned long get_macb_pclk_rate(unsigned int dev_id)
66 {
67         return get_pbb_clk_rate();
68 }
69 static inline unsigned long get_macb_hclk_rate(unsigned int dev_id)
70 {
71         return get_hsb_clk_rate();
72 }
73 #endif
74 #ifdef AT32AP700x_CHIP_HAS_MMCI
75 static inline unsigned long get_mci_clk_rate(void)
76 {
77         return get_pbb_clk_rate();
78 }
79 #endif
80 #ifdef AT32AP700x_CHIP_HAS_SPI
81 static inline unsigned long get_spi_clk_rate(unsigned int dev_id)
82 {
83         return get_pba_clk_rate();
84 }
85 #endif
86
87 extern void clk_init(void);
88
89 /* Board code may need the SDRAM base clock as a compile-time constant */
90 #define SDRAMC_BUS_HZ   (MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_HSB)
91
92 /* Generic clock control */
93 enum gclk_parent {
94         GCLK_PARENT_OSC0 = 0,
95         GCLK_PARENT_OSC1 = 1,
96         GCLK_PARENT_PLL0 = 2,
97         GCLK_PARENT_PLL1 = 3,
98 };
99
100 /* Some generic clocks have specific roles */
101 #define GCLK_DAC_SAMPLE_CLK     6
102 #define GCLK_LCDC_PIXCLK        7
103
104 extern unsigned long __gclk_set_rate(unsigned int id, enum gclk_parent parent,
105                 unsigned long rate, unsigned long parent_rate);
106
107 /**
108  * gclk_set_rate - configure and enable a generic clock
109  * @id: Which GCLK[id] to enable
110  * @parent: Parent clock feeding the GCLK
111  * @rate: Target rate of the GCLK in Hz
112  *
113  * Returns the actual GCLK rate in Hz, after rounding to the nearest
114  * supported rate.
115  *
116  * All three parameters are usually constant, hence the inline.
117  */
118 static inline unsigned long gclk_set_rate(unsigned int id,
119                 enum gclk_parent parent, unsigned long rate)
120 {
121         unsigned long parent_rate;
122
123         if (id > 7)
124                 return 0;
125
126         switch (parent) {
127         case GCLK_PARENT_OSC0:
128                 parent_rate = CONFIG_SYS_OSC0_HZ;
129                 break;
130 #ifdef CONFIG_SYS_OSC1_HZ
131         case GCLK_PARENT_OSC1:
132                 parent_rate = CONFIG_SYS_OSC1_HZ;
133                 break;
134 #endif
135 #ifdef PLL0_RATE
136         case GCLK_PARENT_PLL0:
137                 parent_rate = PLL0_RATE;
138                 break;
139 #endif
140 #ifdef PLL1_RATE
141         case GCLK_PARENT_PLL1:
142                 parent_rate = PLL1_RATE;
143                 break;
144 #endif
145         default:
146                 parent_rate = 0;
147                 break;
148         }
149
150         return __gclk_set_rate(id, parent, rate, parent_rate);
151 }
152
153 /**
154  * gclk_enable_output - enable output on a GCLK pin
155  * @id: Which GCLK[id] pin to enable
156  * @drive_strength: Drive strength of external GCLK pin, if applicable
157  */
158 static inline void gclk_enable_output(unsigned int id,
159                 unsigned long drive_strength)
160 {
161         switch (id) {
162         case 0:
163                 portmux_select_peripheral(PORTMUX_PORT_A, 1 << 30,
164                                 PORTMUX_FUNC_A, drive_strength);
165                 break;
166         case 1:
167                 portmux_select_peripheral(PORTMUX_PORT_A, 1 << 31,
168                                 PORTMUX_FUNC_A, drive_strength);
169                 break;
170         case 2:
171                 portmux_select_peripheral(PORTMUX_PORT_B, 1 << 19,
172                                 PORTMUX_FUNC_A, drive_strength);
173                 break;
174         case 3:
175                 portmux_select_peripheral(PORTMUX_PORT_B, 1 << 29,
176                                 PORTMUX_FUNC_A, drive_strength);
177                 break;
178         case 4:
179                 portmux_select_peripheral(PORTMUX_PORT_B, 1 << 30,
180                                 PORTMUX_FUNC_A, drive_strength);
181                 break;
182         }
183 }
184
185 #endif /* __ASM_AVR32_ARCH_CLK_H__ */