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 
get_cpu_clk_rate(void)36 static inline unsigned long get_cpu_clk_rate(void)
37 {
38 	return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_CPU;
39 }
get_hsb_clk_rate(void)40 static inline unsigned long get_hsb_clk_rate(void)
41 {
42 	return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_HSB;
43 }
get_pba_clk_rate(void)44 static inline unsigned long get_pba_clk_rate(void)
45 {
46 	return MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_PBA;
47 }
get_pbb_clk_rate(void)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. */
get_sdram_clk_rate(void)54 static inline unsigned long get_sdram_clk_rate(void)
55 {
56 	return get_hsb_clk_rate();
57 }
58 #ifdef AT32AP700x_CHIP_HAS_USART
get_usart_clk_rate(unsigned int dev_id)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
get_macb_pclk_rate(unsigned int dev_id)65 static inline unsigned long get_macb_pclk_rate(unsigned int dev_id)
66 {
67 	return get_pbb_clk_rate();
68 }
get_macb_hclk_rate(unsigned int dev_id)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
get_mci_clk_rate(void)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
get_spi_clk_rate(unsigned int dev_id)81 static inline unsigned long get_spi_clk_rate(unsigned int dev_id)
82 {
83 	return get_pba_clk_rate();
84 }
85 #endif
86 #ifdef AT32AP700x_CHIP_HAS_LCDC
get_lcdc_clk_rate(unsigned int dev_id)87 static inline unsigned long get_lcdc_clk_rate(unsigned int dev_id)
88 {
89 	return get_hsb_clk_rate();
90 }
91 #endif
92 
93 extern void clk_init(void);
94 
95 /* Board code may need the SDRAM base clock as a compile-time constant */
96 #define SDRAMC_BUS_HZ	(MAIN_CLK_RATE >> CONFIG_SYS_CLKDIV_HSB)
97 
98 /* Generic clock control */
99 enum gclk_parent {
100 	GCLK_PARENT_OSC0 = 0,
101 	GCLK_PARENT_OSC1 = 1,
102 	GCLK_PARENT_PLL0 = 2,
103 	GCLK_PARENT_PLL1 = 3,
104 };
105 
106 /* Some generic clocks have specific roles */
107 #define GCLK_DAC_SAMPLE_CLK	6
108 #define GCLK_LCDC_PIXCLK	7
109 
110 extern unsigned long __gclk_set_rate(unsigned int id, enum gclk_parent parent,
111 		unsigned long rate, unsigned long parent_rate);
112 
113 /**
114  * gclk_set_rate - configure and enable a generic clock
115  * @id: Which GCLK[id] to enable
116  * @parent: Parent clock feeding the GCLK
117  * @rate: Target rate of the GCLK in Hz
118  *
119  * Returns the actual GCLK rate in Hz, after rounding to the nearest
120  * supported rate.
121  *
122  * All three parameters are usually constant, hence the inline.
123  */
gclk_set_rate(unsigned int id,enum gclk_parent parent,unsigned long rate)124 static inline unsigned long gclk_set_rate(unsigned int id,
125 		enum gclk_parent parent, unsigned long rate)
126 {
127 	unsigned long parent_rate;
128 
129 	if (id > 7)
130 		return 0;
131 
132 	switch (parent) {
133 	case GCLK_PARENT_OSC0:
134 		parent_rate = CONFIG_SYS_OSC0_HZ;
135 		break;
136 #ifdef CONFIG_SYS_OSC1_HZ
137 	case GCLK_PARENT_OSC1:
138 		parent_rate = CONFIG_SYS_OSC1_HZ;
139 		break;
140 #endif
141 #ifdef PLL0_RATE
142 	case GCLK_PARENT_PLL0:
143 		parent_rate = PLL0_RATE;
144 		break;
145 #endif
146 #ifdef PLL1_RATE
147 	case GCLK_PARENT_PLL1:
148 		parent_rate = PLL1_RATE;
149 		break;
150 #endif
151 	default:
152 		parent_rate = 0;
153 		break;
154 	}
155 
156 	return __gclk_set_rate(id, parent, rate, parent_rate);
157 }
158 
159 /**
160  * gclk_enable_output - enable output on a GCLK pin
161  * @id: Which GCLK[id] pin to enable
162  * @drive_strength: Drive strength of external GCLK pin, if applicable
163  */
gclk_enable_output(unsigned int id,unsigned long drive_strength)164 static inline void gclk_enable_output(unsigned int id,
165 		unsigned long drive_strength)
166 {
167 	switch (id) {
168 	case 0:
169 		portmux_select_peripheral(PORTMUX_PORT_A, 1 << 30,
170 				PORTMUX_FUNC_A, drive_strength);
171 		break;
172 	case 1:
173 		portmux_select_peripheral(PORTMUX_PORT_A, 1 << 31,
174 				PORTMUX_FUNC_A, drive_strength);
175 		break;
176 	case 2:
177 		portmux_select_peripheral(PORTMUX_PORT_B, 1 << 19,
178 				PORTMUX_FUNC_A, drive_strength);
179 		break;
180 	case 3:
181 		portmux_select_peripheral(PORTMUX_PORT_B, 1 << 29,
182 				PORTMUX_FUNC_A, drive_strength);
183 		break;
184 	case 4:
185 		portmux_select_peripheral(PORTMUX_PORT_B, 1 << 30,
186 				PORTMUX_FUNC_A, drive_strength);
187 		break;
188 	}
189 }
190 
191 #endif /* __ASM_AVR32_ARCH_CLK_H__ */
192