diff options
Diffstat (limited to 'arch/arm/mach-imx/clock.c')
| -rw-r--r-- | arch/arm/mach-imx/clock.c | 210 |
1 files changed, 0 insertions, 210 deletions
diff --git a/arch/arm/mach-imx/clock.c b/arch/arm/mach-imx/clock.c deleted file mode 100644 index cf332aeb942..00000000000 --- a/arch/arm/mach-imx/clock.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * Copyright (C) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include <linux/kernel.h> -#include <linux/device.h> -#include <linux/list.h> -#include <linux/math64.h> -#include <linux/err.h> -#include <linux/io.h> - -#include <mach/hardware.h> - -/* - * Very simple approach: We can't disable clocks, so we do - * not need refcounting - */ - -struct clk { - struct list_head node; - const char *name; - unsigned long (*get_rate)(void); -}; - -/* - * get the system pll clock in Hz - * - * mfi + mfn / (mfd +1) - * f = 2 * f_ref * -------------------- - * pd + 1 - */ -static unsigned long imx_decode_pll(unsigned int pll, u32 f_ref) -{ - unsigned long long ll; - unsigned long quot; - - u32 mfi = (pll >> 10) & 0xf; - u32 mfn = pll & 0x3ff; - u32 mfd = (pll >> 16) & 0x3ff; - u32 pd = (pll >> 26) & 0xf; - - mfi = mfi <= 5 ? 5 : mfi; - - ll = 2 * (unsigned long long)f_ref * - ((mfi << 16) + (mfn << 16) / (mfd + 1)); - quot = (pd + 1) * (1 << 16); - ll += quot / 2; - do_div(ll, quot); - return (unsigned long)ll; -} - -static unsigned long imx_get_system_clk(void) -{ - u32 f_ref = (CSCR & CSCR_SYSTEM_SEL) ? 16000000 : (CLK32 * 512); - - return imx_decode_pll(SPCTL0, f_ref); -} - -static unsigned long imx_get_mcu_clk(void) -{ - return imx_decode_pll(MPCTL0, CLK32 * 512); -} - -/* - * get peripheral clock 1 ( UART[12], Timer[12], PWM ) - */ -static unsigned long imx_get_perclk1(void) -{ - return imx_get_system_clk() / (((PCDR) & 0xf)+1); -} - -/* - * get peripheral clock 2 ( LCD, SD, SPI[12] ) - */ -static unsigned long imx_get_perclk2(void) -{ - return imx_get_system_clk() / (((PCDR>>4) & 0xf)+1); -} - -/* - * get peripheral clock 3 ( SSI ) - */ -static unsigned long imx_get_perclk3(void) -{ - return imx_get_system_clk() / (((PCDR>>16) & 0x7f)+1); -} - -/* - * get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA ) - */ -static unsigned long imx_get_hclk(void) -{ - return imx_get_system_clk() / (((CSCR>>10) & 0xf)+1); -} - -static struct clk clk_system_clk = { - .name = "system_clk", - .get_rate = imx_get_system_clk, -}; - -static struct clk clk_hclk = { - .name = "hclk", - .get_rate = imx_get_hclk, -}; - -static struct clk clk_mcu_clk = { - .name = "mcu_clk", - .get_rate = imx_get_mcu_clk, -}; - -static struct clk clk_perclk1 = { - .name = "perclk1", - .get_rate = imx_get_perclk1, -}; - -static struct clk clk_uart_clk = { - .name = "uart_clk", - .get_rate = imx_get_perclk1, -}; - -static struct clk clk_perclk2 = { - .name = "perclk2", - .get_rate = imx_get_perclk2, -}; - -static struct clk clk_perclk3 = { - .name = "perclk3", - .get_rate = imx_get_perclk3, -}; - -static struct clk *clks[] = { - &clk_perclk1, - &clk_perclk2, - &clk_perclk3, - &clk_system_clk, - &clk_hclk, - &clk_mcu_clk, - &clk_uart_clk, -}; - -static LIST_HEAD(clocks); -static DEFINE_MUTEX(clocks_mutex); - -struct clk *clk_get(struct device *dev, const char *id) -{ - struct clk *p, *clk = ERR_PTR(-ENOENT); - - mutex_lock(&clocks_mutex); - list_for_each_entry(p, &clocks, node) { - if (!strcmp(p->name, id)) { - clk = p; - goto found; - } - } - -found: - mutex_unlock(&clocks_mutex); - - return clk; -} -EXPORT_SYMBOL(clk_get); - -void clk_put(struct clk *clk) -{ -} -EXPORT_SYMBOL(clk_put); - -int clk_enable(struct clk *clk) -{ - return 0; -} -EXPORT_SYMBOL(clk_enable); - -void clk_disable(struct clk *clk) -{ -} -EXPORT_SYMBOL(clk_disable); - -unsigned long clk_get_rate(struct clk *clk) -{ - return clk->get_rate(); -} -EXPORT_SYMBOL(clk_get_rate); - -int imx_clocks_init(void) -{ - int i; - - mutex_lock(&clocks_mutex); - for (i = 0; i < ARRAY_SIZE(clks); i++) - list_add(&clks[i]->node, &clocks); - mutex_unlock(&clocks_mutex); - - return 0; -} - |