a2865197a5
We had 3 versions of this function in clock support for MX1/2/3 Use a single one instead. I picked the one from the MX3 as it seems to calculate more accurate as the other ones. Also, on MX27 and MX31 mfn can be negative, this hasn't been handled correctly on MX27 since now. This patch has been tested on MX27 and MX31 and produces the same clock frequencies for me. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
630 lines
13 KiB
C
630 lines
13 KiB
C
/*
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* Copyright (C) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/math64.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/clock.h>
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#include <mach/hardware.h>
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#include "crm_regs.h"
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static int _clk_enable(struct clk *clk)
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{
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unsigned int reg;
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reg = __raw_readl(clk->enable_reg);
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reg |= 1 << clk->enable_shift;
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__raw_writel(reg, clk->enable_reg);
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return 0;
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}
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static void _clk_disable(struct clk *clk)
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{
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unsigned int reg;
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reg = __raw_readl(clk->enable_reg);
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reg &= ~(1 << clk->enable_shift);
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__raw_writel(reg, clk->enable_reg);
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}
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static int _clk_can_use_parent(const struct clk *clk_arr[], unsigned int size,
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struct clk *parent)
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{
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int i;
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for (i = 0; i < size; i++)
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if (parent == clk_arr[i])
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return i;
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return -EINVAL;
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}
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static unsigned long
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_clk_simple_round_rate(struct clk *clk, unsigned long rate, unsigned int limit)
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{
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int div;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (parent_rate % rate)
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div++;
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if (div > limit)
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div = limit;
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return parent_rate / div;
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}
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static unsigned long _clk_parent_round_rate(struct clk *clk, unsigned long rate)
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{
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return clk->parent->round_rate(clk->parent, rate);
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}
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static int _clk_parent_set_rate(struct clk *clk, unsigned long rate)
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{
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return clk->parent->set_rate(clk->parent, rate);
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}
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static unsigned long clk16m_get_rate(struct clk *clk)
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{
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return 16000000;
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}
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static struct clk clk16m = {
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.name = "CLK16M",
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.get_rate = clk16m_get_rate,
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.enable = _clk_enable,
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.enable_reg = CCM_CSCR,
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.enable_shift = CCM_CSCR_OSC_EN_SHIFT,
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.disable = _clk_disable,
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};
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/* in Hz */
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static unsigned long clk32_rate;
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static unsigned long clk32_get_rate(struct clk *clk)
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{
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return clk32_rate;
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}
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static struct clk clk32 = {
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.name = "CLK32",
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.get_rate = clk32_get_rate,
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};
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static unsigned long clk32_premult_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) * 512;
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}
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static struct clk clk32_premult = {
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.name = "CLK32_premultiplier",
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.parent = &clk32,
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.get_rate = clk32_premult_get_rate,
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};
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static const struct clk *prem_clk_clocks[] = {
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&clk32_premult,
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&clk16m,
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};
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static int prem_clk_set_parent(struct clk *clk, struct clk *parent)
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{
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int i;
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unsigned int reg = __raw_readl(CCM_CSCR);
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i = _clk_can_use_parent(prem_clk_clocks, ARRAY_SIZE(prem_clk_clocks),
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parent);
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switch (i) {
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case 0:
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reg &= ~CCM_CSCR_SYSTEM_SEL;
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break;
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case 1:
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reg |= CCM_CSCR_SYSTEM_SEL;
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break;
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default:
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return i;
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}
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__raw_writel(reg, CCM_CSCR);
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return 0;
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}
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static struct clk prem_clk = {
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.name = "prem_clk",
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.set_parent = prem_clk_set_parent,
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};
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static unsigned long system_clk_get_rate(struct clk *clk)
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{
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return mxc_decode_pll(__raw_readl(CCM_SPCTL0),
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clk_get_rate(clk->parent));
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}
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static struct clk system_clk = {
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.name = "system_clk",
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.parent = &prem_clk,
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.get_rate = system_clk_get_rate,
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};
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static unsigned long mcu_clk_get_rate(struct clk *clk)
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{
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return mxc_decode_pll(__raw_readl(CCM_MPCTL0),
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clk_get_rate(clk->parent));
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}
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static struct clk mcu_clk = {
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.name = "mcu_clk",
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.parent = &clk32_premult,
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.get_rate = mcu_clk_get_rate,
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};
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static unsigned long fclk_get_rate(struct clk *clk)
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{
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unsigned long fclk = clk_get_rate(clk->parent);
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if (__raw_readl(CCM_CSCR) & CCM_CSCR_PRESC)
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fclk /= 2;
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return fclk;
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}
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static struct clk fclk = {
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.name = "fclk",
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.parent = &mcu_clk,
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.get_rate = fclk_get_rate,
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};
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/*
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* get hclk ( SDRAM, CSI, Memory Stick, I2C, DMA )
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*/
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static unsigned long hclk_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) / (((__raw_readl(CCM_CSCR) &
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CCM_CSCR_BCLK_MASK) >> CCM_CSCR_BCLK_OFFSET) + 1);
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}
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static unsigned long hclk_round_rate(struct clk *clk, unsigned long rate)
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{
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return _clk_simple_round_rate(clk, rate, 16);
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}
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static int hclk_set_rate(struct clk *clk, unsigned long rate)
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{
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unsigned int div;
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unsigned int reg;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (div > 16 || div < 1 || ((parent_rate / div) != rate))
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return -EINVAL;
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div--;
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reg = __raw_readl(CCM_CSCR);
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reg &= ~CCM_CSCR_BCLK_MASK;
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reg |= div << CCM_CSCR_BCLK_OFFSET;
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__raw_writel(reg, CCM_CSCR);
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return 0;
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}
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static struct clk hclk = {
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.name = "hclk",
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.parent = &system_clk,
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.get_rate = hclk_get_rate,
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.round_rate = hclk_round_rate,
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.set_rate = hclk_set_rate,
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};
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static unsigned long clk48m_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) / (((__raw_readl(CCM_CSCR) &
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CCM_CSCR_USB_MASK) >> CCM_CSCR_USB_OFFSET) + 1);
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}
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static unsigned long clk48m_round_rate(struct clk *clk, unsigned long rate)
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{
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return _clk_simple_round_rate(clk, rate, 8);
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}
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static int clk48m_set_rate(struct clk *clk, unsigned long rate)
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{
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unsigned int div;
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unsigned int reg;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (div > 8 || div < 1 || ((parent_rate / div) != rate))
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return -EINVAL;
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div--;
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reg = __raw_readl(CCM_CSCR);
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reg &= ~CCM_CSCR_USB_MASK;
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reg |= div << CCM_CSCR_USB_OFFSET;
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__raw_writel(reg, CCM_CSCR);
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return 0;
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}
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static struct clk clk48m = {
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.name = "CLK48M",
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.parent = &system_clk,
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.get_rate = clk48m_get_rate,
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.round_rate = clk48m_round_rate,
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.set_rate = clk48m_set_rate,
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};
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/*
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* get peripheral clock 1 ( UART[12], Timer[12], PWM )
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*/
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static unsigned long perclk1_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
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CCM_PCDR_PCLK1_MASK) >> CCM_PCDR_PCLK1_OFFSET) + 1);
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}
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static unsigned long perclk1_round_rate(struct clk *clk, unsigned long rate)
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{
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return _clk_simple_round_rate(clk, rate, 16);
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}
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static int perclk1_set_rate(struct clk *clk, unsigned long rate)
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{
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unsigned int div;
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unsigned int reg;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (div > 16 || div < 1 || ((parent_rate / div) != rate))
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return -EINVAL;
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div--;
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reg = __raw_readl(CCM_PCDR);
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reg &= ~CCM_PCDR_PCLK1_MASK;
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reg |= div << CCM_PCDR_PCLK1_OFFSET;
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__raw_writel(reg, CCM_PCDR);
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return 0;
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}
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/*
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* get peripheral clock 2 ( LCD, SD, SPI[12] )
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*/
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static unsigned long perclk2_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
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CCM_PCDR_PCLK2_MASK) >> CCM_PCDR_PCLK2_OFFSET) + 1);
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}
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static unsigned long perclk2_round_rate(struct clk *clk, unsigned long rate)
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{
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return _clk_simple_round_rate(clk, rate, 16);
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}
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static int perclk2_set_rate(struct clk *clk, unsigned long rate)
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{
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unsigned int div;
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unsigned int reg;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (div > 16 || div < 1 || ((parent_rate / div) != rate))
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return -EINVAL;
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div--;
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reg = __raw_readl(CCM_PCDR);
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reg &= ~CCM_PCDR_PCLK2_MASK;
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reg |= div << CCM_PCDR_PCLK2_OFFSET;
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__raw_writel(reg, CCM_PCDR);
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return 0;
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}
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/*
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* get peripheral clock 3 ( SSI )
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*/
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static unsigned long perclk3_get_rate(struct clk *clk)
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{
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return clk_get_rate(clk->parent) / (((__raw_readl(CCM_PCDR) &
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CCM_PCDR_PCLK3_MASK) >> CCM_PCDR_PCLK3_OFFSET) + 1);
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}
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static unsigned long perclk3_round_rate(struct clk *clk, unsigned long rate)
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{
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return _clk_simple_round_rate(clk, rate, 128);
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}
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static int perclk3_set_rate(struct clk *clk, unsigned long rate)
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{
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unsigned int div;
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unsigned int reg;
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unsigned long parent_rate;
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parent_rate = clk_get_rate(clk->parent);
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div = parent_rate / rate;
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if (div > 128 || div < 1 || ((parent_rate / div) != rate))
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return -EINVAL;
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div--;
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reg = __raw_readl(CCM_PCDR);
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reg &= ~CCM_PCDR_PCLK3_MASK;
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reg |= div << CCM_PCDR_PCLK3_OFFSET;
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__raw_writel(reg, CCM_PCDR);
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return 0;
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}
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static struct clk perclk[] = {
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{
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.name = "perclk",
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.id = 0,
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.parent = &system_clk,
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.get_rate = perclk1_get_rate,
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.round_rate = perclk1_round_rate,
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.set_rate = perclk1_set_rate,
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}, {
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.name = "perclk",
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.id = 1,
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.parent = &system_clk,
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.get_rate = perclk2_get_rate,
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.round_rate = perclk2_round_rate,
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.set_rate = perclk2_set_rate,
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}, {
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.name = "perclk",
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.id = 2,
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.parent = &system_clk,
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.get_rate = perclk3_get_rate,
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.round_rate = perclk3_round_rate,
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.set_rate = perclk3_set_rate,
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}
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};
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static const struct clk *clko_clocks[] = {
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&perclk[0],
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&hclk,
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&clk48m,
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&clk16m,
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&prem_clk,
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&fclk,
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};
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static int clko_set_parent(struct clk *clk, struct clk *parent)
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{
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int i;
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unsigned int reg;
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i = _clk_can_use_parent(clko_clocks, ARRAY_SIZE(clko_clocks), parent);
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if (i < 0)
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return i;
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reg = __raw_readl(CCM_CSCR) & ~CCM_CSCR_CLKO_MASK;
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reg |= i << CCM_CSCR_CLKO_OFFSET;
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__raw_writel(reg, CCM_CSCR);
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if (clko_clocks[i]->set_rate && clko_clocks[i]->round_rate) {
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clk->set_rate = _clk_parent_set_rate;
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clk->round_rate = _clk_parent_round_rate;
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} else {
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clk->set_rate = NULL;
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clk->round_rate = NULL;
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}
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return 0;
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}
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static struct clk clko_clk = {
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.name = "clko_clk",
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.set_parent = clko_set_parent,
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};
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static struct clk dma_clk = {
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.name = "dma_clk",
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.parent = &hclk,
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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.enable = _clk_enable,
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.enable_reg = SCM_GCCR,
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.enable_shift = SCM_GCCR_DMA_CLK_EN_OFFSET,
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.disable = _clk_disable,
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};
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static struct clk csi_clk = {
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.name = "csi_clk",
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.parent = &hclk,
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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.enable = _clk_enable,
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.enable_reg = SCM_GCCR,
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.enable_shift = SCM_GCCR_CSI_CLK_EN_OFFSET,
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.disable = _clk_disable,
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};
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static struct clk mma_clk = {
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.name = "mma_clk",
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.parent = &hclk,
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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.enable = _clk_enable,
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.enable_reg = SCM_GCCR,
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.enable_shift = SCM_GCCR_MMA_CLK_EN_OFFSET,
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.disable = _clk_disable,
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};
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static struct clk usbd_clk = {
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.name = "usbd_clk",
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.parent = &clk48m,
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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.enable = _clk_enable,
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.enable_reg = SCM_GCCR,
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.enable_shift = SCM_GCCR_USBD_CLK_EN_OFFSET,
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.disable = _clk_disable,
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};
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static struct clk gpt_clk = {
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.name = "gpt_clk",
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.parent = &perclk[0],
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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};
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static struct clk uart_clk = {
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.name = "uart_clk",
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.parent = &perclk[0],
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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};
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static struct clk i2c_clk = {
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.name = "i2c_clk",
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.parent = &hclk,
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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};
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static struct clk spi_clk = {
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.name = "spi_clk",
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.parent = &perclk[1],
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
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};
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static struct clk sdhc_clk = {
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.name = "sdhc_clk",
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.parent = &perclk[1],
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.round_rate = _clk_parent_round_rate,
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.set_rate = _clk_parent_set_rate,
|
|
};
|
|
|
|
static struct clk lcdc_clk = {
|
|
.name = "lcdc_clk",
|
|
.parent = &perclk[1],
|
|
.round_rate = _clk_parent_round_rate,
|
|
.set_rate = _clk_parent_set_rate,
|
|
};
|
|
|
|
static struct clk mshc_clk = {
|
|
.name = "mshc_clk",
|
|
.parent = &hclk,
|
|
.round_rate = _clk_parent_round_rate,
|
|
.set_rate = _clk_parent_set_rate,
|
|
};
|
|
|
|
static struct clk ssi_clk = {
|
|
.name = "ssi_clk",
|
|
.parent = &perclk[2],
|
|
.round_rate = _clk_parent_round_rate,
|
|
.set_rate = _clk_parent_set_rate,
|
|
};
|
|
|
|
static struct clk rtc_clk = {
|
|
.name = "rtc_clk",
|
|
.parent = &clk32,
|
|
};
|
|
|
|
static struct clk *mxc_clks[] = {
|
|
&clk16m,
|
|
&clk32,
|
|
&clk32_premult,
|
|
&prem_clk,
|
|
&system_clk,
|
|
&mcu_clk,
|
|
&fclk,
|
|
&hclk,
|
|
&clk48m,
|
|
&perclk[0],
|
|
&perclk[1],
|
|
&perclk[2],
|
|
&clko_clk,
|
|
&dma_clk,
|
|
&csi_clk,
|
|
&mma_clk,
|
|
&usbd_clk,
|
|
&gpt_clk,
|
|
&uart_clk,
|
|
&i2c_clk,
|
|
&spi_clk,
|
|
&sdhc_clk,
|
|
&lcdc_clk,
|
|
&mshc_clk,
|
|
&ssi_clk,
|
|
&rtc_clk,
|
|
};
|
|
|
|
int __init mxc_clocks_init(unsigned long fref)
|
|
{
|
|
struct clk **clkp;
|
|
unsigned int reg;
|
|
|
|
/* disable clocks we are able to */
|
|
__raw_writel(0, SCM_GCCR);
|
|
|
|
clk32_rate = fref;
|
|
reg = __raw_readl(CCM_CSCR);
|
|
|
|
/* detect clock reference for system PLL */
|
|
if (reg & CCM_CSCR_SYSTEM_SEL) {
|
|
prem_clk.parent = &clk16m;
|
|
} else {
|
|
/* ensure that oscillator is disabled */
|
|
reg &= ~(1 << CCM_CSCR_OSC_EN_SHIFT);
|
|
__raw_writel(reg, CCM_CSCR);
|
|
prem_clk.parent = &clk32_premult;
|
|
}
|
|
|
|
/* detect reference for CLKO */
|
|
reg = (reg & CCM_CSCR_CLKO_MASK) >> CCM_CSCR_CLKO_OFFSET;
|
|
clko_clk.parent = (struct clk *)clko_clocks[reg];
|
|
|
|
for (clkp = mxc_clks; clkp < mxc_clks + ARRAY_SIZE(mxc_clks); clkp++)
|
|
clk_register(*clkp);
|
|
|
|
clk_enable(&hclk);
|
|
clk_enable(&fclk);
|
|
|
|
return 0;
|
|
}
|