Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 1 | /* linux/arch/arm/mach-s3c2410/s3c2440-clock.c |
| 2 | * |
| 3 | * Copyright (c) 2004-2005 Simtec Electronics |
| 4 | * http://armlinux.simtec.co.uk/ |
| 5 | * Ben Dooks <ben@simtec.co.uk> |
| 6 | * |
| 7 | * S3C2440 Clock support |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/kernel.h> |
| 27 | #include <linux/list.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/err.h> |
| 30 | #include <linux/device.h> |
| 31 | #include <linux/sysdev.h> |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/ioport.h> |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 34 | #include <linux/mutex.h> |
Russell King | f8ce254 | 2006-01-07 16:15:52 +0000 | [diff] [blame] | 35 | #include <linux/clk.h> |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 36 | |
| 37 | #include <asm/hardware.h> |
| 38 | #include <asm/atomic.h> |
| 39 | #include <asm/irq.h> |
| 40 | #include <asm/io.h> |
| 41 | |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 42 | #include <asm/arch/regs-clock.h> |
| 43 | |
| 44 | #include "clock.h" |
| 45 | #include "cpu.h" |
| 46 | |
| 47 | /* S3C2440 extended clock support */ |
| 48 | |
Ben Dooks | e44c039 | 2006-03-20 21:00:12 +0000 | [diff] [blame] | 49 | static unsigned long s3c2440_camif_upll_round(struct clk *clk, |
| 50 | unsigned long rate) |
| 51 | { |
| 52 | unsigned long parent_rate = clk_get_rate(clk->parent); |
| 53 | int div; |
| 54 | |
| 55 | if (rate > parent_rate) |
| 56 | return parent_rate; |
| 57 | |
| 58 | /* note, we remove the +/- 1 calculations for the divisor */ |
| 59 | |
| 60 | div = (parent_rate / rate) / 2; |
| 61 | |
| 62 | if (div < 1) |
| 63 | div = 1; |
| 64 | else if (div > 16) |
| 65 | div = 16; |
| 66 | |
| 67 | return parent_rate / (div * 2); |
| 68 | } |
| 69 | |
| 70 | static int s3c2440_camif_upll_setrate(struct clk *clk, unsigned long rate) |
| 71 | { |
| 72 | unsigned long parent_rate = clk_get_rate(clk->parent); |
| 73 | unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN); |
| 74 | |
| 75 | rate = s3c2440_camif_upll_round(clk, rate); |
| 76 | |
| 77 | camdivn &= ~(S3C2440_CAMDIVN_CAMCLK_SEL | S3C2440_CAMDIVN_CAMCLK_MASK); |
| 78 | |
| 79 | if (rate != parent_rate) { |
| 80 | camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL; |
| 81 | camdivn |= (((parent_rate / rate) / 2) - 1); |
| 82 | } |
| 83 | |
| 84 | __raw_writel(camdivn, S3C2440_CAMDIVN); |
| 85 | |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | /* Extra S3C2440 clocks */ |
| 90 | |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 91 | static struct clk s3c2440_clk_cam = { |
| 92 | .name = "camif", |
| 93 | .id = -1, |
| 94 | .enable = s3c24xx_clkcon_enable, |
| 95 | .ctrlbit = S3C2440_CLKCON_CAMERA, |
| 96 | }; |
| 97 | |
Ben Dooks | e44c039 | 2006-03-20 21:00:12 +0000 | [diff] [blame] | 98 | static struct clk s3c2440_clk_cam_upll = { |
| 99 | .name = "camif-upll", |
| 100 | .id = -1, |
| 101 | .set_rate = s3c2440_camif_upll_setrate, |
| 102 | .round_rate = s3c2440_camif_upll_round, |
| 103 | }; |
| 104 | |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 105 | static struct clk s3c2440_clk_ac97 = { |
| 106 | .name = "ac97", |
| 107 | .id = -1, |
| 108 | .enable = s3c24xx_clkcon_enable, |
| 109 | .ctrlbit = S3C2440_CLKCON_CAMERA, |
| 110 | }; |
| 111 | |
| 112 | static int s3c2440_clk_add(struct sys_device *sysdev) |
| 113 | { |
Ben Dooks | 01b9c41 | 2005-08-29 22:46:31 +0100 | [diff] [blame] | 114 | unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN); |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 115 | unsigned long clkdivn; |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 116 | struct clk *clk_h; |
| 117 | struct clk *clk_p; |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 118 | struct clk *clk_upll; |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 119 | |
Ben Dooks | 8e40a2f | 2006-03-20 17:10:04 +0000 | [diff] [blame] | 120 | printk("S3C2440: Clock Support, DVS %s\n", |
Ben Dooks | 01b9c41 | 2005-08-29 22:46:31 +0100 | [diff] [blame] | 121 | (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off"); |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 122 | |
| 123 | clk_p = clk_get(NULL, "pclk"); |
| 124 | clk_h = clk_get(NULL, "hclk"); |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 125 | clk_upll = clk_get(NULL, "upll"); |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 126 | |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 127 | if (IS_ERR(clk_p) || IS_ERR(clk_h) || IS_ERR(clk_upll)) { |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 128 | printk(KERN_ERR "S3C2440: Failed to get parent clocks\n"); |
| 129 | return -EINVAL; |
| 130 | } |
| 131 | |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 132 | /* check rate of UPLL, and if it is near 96MHz, then change |
| 133 | * to using half the UPLL rate for the system */ |
| 134 | |
| 135 | if (clk_get_rate(clk_upll) > (94 * MHZ)) { |
| 136 | clk_usb_bus.rate = clk_get_rate(clk_upll) / 2; |
| 137 | |
| 138 | mutex_lock(&clocks_mutex); |
| 139 | |
| 140 | clkdivn = __raw_readl(S3C2410_CLKDIVN); |
| 141 | clkdivn |= S3C2440_CLKDIVN_UCLK; |
Ben Dooks | 0f6e439 | 2006-04-11 18:20:06 +0100 | [diff] [blame] | 142 | __raw_writel(clkdivn, S3C2410_CLKDIVN); |
Ben Dooks | 36c64af | 2006-03-20 21:00:48 +0000 | [diff] [blame] | 143 | |
| 144 | mutex_unlock(&clocks_mutex); |
| 145 | } |
| 146 | |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 147 | s3c2440_clk_cam.parent = clk_h; |
| 148 | s3c2440_clk_ac97.parent = clk_p; |
Ben Dooks | e44c039 | 2006-03-20 21:00:12 +0000 | [diff] [blame] | 149 | s3c2440_clk_cam_upll.parent = clk_upll; |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 150 | |
| 151 | s3c24xx_register_clock(&s3c2440_clk_ac97); |
| 152 | s3c24xx_register_clock(&s3c2440_clk_cam); |
Ben Dooks | e44c039 | 2006-03-20 21:00:12 +0000 | [diff] [blame] | 153 | s3c24xx_register_clock(&s3c2440_clk_cam_upll); |
Ben Dooks | a8d11e3 | 2005-07-26 22:39:14 +0100 | [diff] [blame] | 154 | |
| 155 | clk_disable(&s3c2440_clk_ac97); |
| 156 | clk_disable(&s3c2440_clk_cam); |
| 157 | |
| 158 | return 0; |
| 159 | } |
| 160 | |
| 161 | static struct sysdev_driver s3c2440_clk_driver = { |
| 162 | .add = s3c2440_clk_add, |
| 163 | }; |
| 164 | |
| 165 | static __init int s3c24xx_clk_driver(void) |
| 166 | { |
| 167 | return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver); |
| 168 | } |
| 169 | |
| 170 | arch_initcall(s3c24xx_clk_driver); |