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kernel add
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/*
* EMMA Mobile EV2 common clock framework support
*
* Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com>
* Copyright (C) 2012 Magnus Damm
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
/* EMEV2 SMU registers */
#define USIAU0_RSTCTRL 0x094
#define USIBU1_RSTCTRL 0x0ac
#define USIBU2_RSTCTRL 0x0b0
#define USIBU3_RSTCTRL 0x0b4
#define IIC0_RSTCTRL 0x0dc
#define IIC1_RSTCTRL 0x0e0
#define STI_RSTCTRL 0x124
#define STI_CLKSEL 0x688
static DEFINE_SPINLOCK(lock);
/* not pretty, but hey */
static void __iomem *smu_base;
static void __init emev2_smu_write(unsigned long value, int offs)
{
BUG_ON(!smu_base || (offs >= PAGE_SIZE));
writel_relaxed(value, smu_base + offs);
}
static const struct of_device_id smu_id[] __initconst = {
{ .compatible = "renesas,emev2-smu", },
{},
};
static void __init emev2_smu_init(void)
{
struct device_node *np;
np = of_find_matching_node(NULL, smu_id);
BUG_ON(!np);
smu_base = of_iomap(np, 0);
BUG_ON(!smu_base);
of_node_put(np);
/* setup STI timer to run on 32.768 kHz and deassert reset */
emev2_smu_write(0, STI_CLKSEL);
emev2_smu_write(1, STI_RSTCTRL);
/* deassert reset for UART0->UART3 */
emev2_smu_write(2, USIAU0_RSTCTRL);
emev2_smu_write(2, USIBU1_RSTCTRL);
emev2_smu_write(2, USIBU2_RSTCTRL);
emev2_smu_write(2, USIBU3_RSTCTRL);
/* deassert reset for IIC0->IIC1 */
emev2_smu_write(1, IIC0_RSTCTRL);
emev2_smu_write(1, IIC1_RSTCTRL);
}
static void __init emev2_smu_clkdiv_init(struct device_node *np)
{
u32 reg[2];
struct clk *clk;
const char *parent_name = of_clk_get_parent_name(np, 0);
if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
return;
if (!smu_base)
emev2_smu_init();
clk = clk_register_divider(NULL, np->name, parent_name, 0,
smu_base + reg[0], reg[1], 8, 0, &lock);
of_clk_add_provider(np, of_clk_src_simple_get, clk);
clk_register_clkdev(clk, np->name, NULL);
pr_debug("## %s %s %p
", __func__, np->name, clk);
}
CLK_OF_DECLARE(emev2_smu_clkdiv, "renesas,emev2-smu-clkdiv",
emev2_smu_clkdiv_init);
static void __init emev2_smu_gclk_init(struct device_node *np)
{
u32 reg[2];
struct clk *clk;
const char *parent_name = of_clk_get_parent_name(np, 0);
if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
return;
if (!smu_base)
emev2_smu_init();
clk = clk_register_gate(NULL, np->name, parent_name, 0,
smu_base + reg[0], reg[1], 0, &lock);
of_clk_add_provider(np, of_clk_src_simple_get, clk);
clk_register_clkdev(clk, np->name, NULL);
pr_debug("## %s %s %p
", __func__, np->name, clk);
}
CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);
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