mirror of
https://github.com/torvalds/linux.git
synced 2024-12-10 13:12:04 +00:00
8f8f484bf3
Add Tegra specific clocks, pll, pll_out, peripheral, frac_divider, super. Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com> [swarren: alloc sizeof(*foo) not sizeof(struct foo), add comments re: storing pointers to stack variables, make a timeout loop more idiomatic, use _clk_pll_disable() not clk_disable_pll() from _program_pll() to avoid redundant lock operations, unified tegra_clk_periph() and tegra_clk_periph_nodiv(), unified tegra_clk_pll{,e}, rename all clock registration functions so they don't have the same name as the clock structs, return -EINVAL from clk_plle_enable when matching table rate not found, pass ops to _tegra_clk_register_pll rather than a bool.] Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Stephen Warren <swarren@nvidia.com>
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/io.h>
|
|
#include <linux/err.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/clk.h>
|
|
|
|
#include "clk.h"
|
|
|
|
#define pll_out_enb(p) (BIT(p->enb_bit_idx))
|
|
#define pll_out_rst(p) (BIT(p->rst_bit_idx))
|
|
|
|
static int clk_pll_out_is_enabled(struct clk_hw *hw)
|
|
{
|
|
struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
|
|
u32 val = readl_relaxed(pll_out->reg);
|
|
int state;
|
|
|
|
state = (val & pll_out_enb(pll_out)) ? 1 : 0;
|
|
if (!(val & (pll_out_rst(pll_out))))
|
|
state = 0;
|
|
return state;
|
|
}
|
|
|
|
static int clk_pll_out_enable(struct clk_hw *hw)
|
|
{
|
|
struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
|
|
unsigned long flags = 0;
|
|
u32 val;
|
|
|
|
if (pll_out->lock)
|
|
spin_lock_irqsave(pll_out->lock, flags);
|
|
|
|
val = readl_relaxed(pll_out->reg);
|
|
|
|
val |= (pll_out_enb(pll_out) | pll_out_rst(pll_out));
|
|
|
|
writel_relaxed(val, pll_out->reg);
|
|
udelay(2);
|
|
|
|
if (pll_out->lock)
|
|
spin_unlock_irqrestore(pll_out->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void clk_pll_out_disable(struct clk_hw *hw)
|
|
{
|
|
struct tegra_clk_pll_out *pll_out = to_clk_pll_out(hw);
|
|
unsigned long flags = 0;
|
|
u32 val;
|
|
|
|
if (pll_out->lock)
|
|
spin_lock_irqsave(pll_out->lock, flags);
|
|
|
|
val = readl_relaxed(pll_out->reg);
|
|
|
|
val &= ~(pll_out_enb(pll_out) | pll_out_rst(pll_out));
|
|
|
|
writel_relaxed(val, pll_out->reg);
|
|
udelay(2);
|
|
|
|
if (pll_out->lock)
|
|
spin_unlock_irqrestore(pll_out->lock, flags);
|
|
}
|
|
|
|
const struct clk_ops tegra_clk_pll_out_ops = {
|
|
.is_enabled = clk_pll_out_is_enabled,
|
|
.enable = clk_pll_out_enable,
|
|
.disable = clk_pll_out_disable,
|
|
};
|
|
|
|
struct clk *tegra_clk_register_pll_out(const char *name,
|
|
const char *parent_name, void __iomem *reg, u8 enb_bit_idx,
|
|
u8 rst_bit_idx, unsigned long flags, u8 pll_out_flags,
|
|
spinlock_t *lock)
|
|
{
|
|
struct tegra_clk_pll_out *pll_out;
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
|
|
pll_out = kzalloc(sizeof(*pll_out), GFP_KERNEL);
|
|
if (!pll_out)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &tegra_clk_pll_out_ops;
|
|
init.parent_names = (parent_name ? &parent_name : NULL);
|
|
init.num_parents = (parent_name ? 1 : 0);
|
|
init.flags = flags;
|
|
|
|
pll_out->reg = reg;
|
|
pll_out->enb_bit_idx = enb_bit_idx;
|
|
pll_out->rst_bit_idx = rst_bit_idx;
|
|
pll_out->flags = pll_out_flags;
|
|
pll_out->lock = lock;
|
|
|
|
/* Data in .init is copied by clk_register(), so stack variable OK */
|
|
pll_out->hw.init = &init;
|
|
|
|
clk = clk_register(NULL, &pll_out->hw);
|
|
if (IS_ERR(clk))
|
|
kfree(pll_out);
|
|
|
|
return clk;
|
|
}
|