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alistair23-linux/drivers/clk/tegra/clk.c

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clk: tegra: add Tegra specific clocks 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>
2013-01-11 00:46:20 -07:00
/*
* 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/clk.h>
#include <linux/clk-provider.h>
ARM: tegra: migrate to new clock code Migrate Tegra clock support to drivers/clk/tegra, this involves moving: 1. definition of tegra_cpu_car_ops to clk.c 2. definition of reset functions to clk-peripheral.c 3. change parent of cpu clock. 4. Remove legacy clock initialization. 5. Initialize clocks using DT. 6. Remove all instance of mach/clk.h Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com> [swarren: use to_clk_periph_gate().] Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-01-11 00:46:26 -07:00
#include <linux/of.h>
#include <linux/clk/tegra.h>
clk: tegra: add Tegra specific clocks 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>
2013-01-11 00:46:20 -07:00
#include "clk.h"
clk: tegra: simplify periph clock data This patch determines the register bank for clock enable/disable and reset based on the clock ID instead of hardcoding it in the tables describing the clocks. This results in less data to be maintained in the tables, making the code easier to understand. The full benefit of the change will be realized once also other clocktypes will be table based. Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
2013-08-22 09:44:06 -06:00
#define CLK_OUT_ENB_L 0x010
#define CLK_OUT_ENB_H 0x014
#define CLK_OUT_ENB_U 0x018
#define CLK_OUT_ENB_V 0x360
#define CLK_OUT_ENB_W 0x364
#define CLK_OUT_ENB_X 0x280
#define CLK_OUT_ENB_SET_L 0x320
#define CLK_OUT_ENB_CLR_L 0x324
#define CLK_OUT_ENB_SET_H 0x328
#define CLK_OUT_ENB_CLR_H 0x32c
#define CLK_OUT_ENB_SET_U 0x330
#define CLK_OUT_ENB_CLR_U 0x334
#define CLK_OUT_ENB_SET_V 0x440
#define CLK_OUT_ENB_CLR_V 0x444
#define CLK_OUT_ENB_SET_W 0x448
#define CLK_OUT_ENB_CLR_W 0x44c
#define CLK_OUT_ENB_SET_X 0x284
#define CLK_OUT_ENB_CLR_X 0x288
#define RST_DEVICES_L 0x004
#define RST_DEVICES_H 0x008
#define RST_DEVICES_U 0x00C
#define RST_DFLL_DVCO 0x2F4
#define RST_DEVICES_V 0x358
#define RST_DEVICES_W 0x35C
#define RST_DEVICES_X 0x28C
#define RST_DEVICES_SET_L 0x300
#define RST_DEVICES_CLR_L 0x304
#define RST_DEVICES_SET_H 0x308
#define RST_DEVICES_CLR_H 0x30c
#define RST_DEVICES_SET_U 0x310
#define RST_DEVICES_CLR_U 0x314
#define RST_DEVICES_SET_V 0x430
#define RST_DEVICES_CLR_V 0x434
#define RST_DEVICES_SET_W 0x438
#define RST_DEVICES_CLR_W 0x43c
ARM: tegra: migrate to new clock code Migrate Tegra clock support to drivers/clk/tegra, this involves moving: 1. definition of tegra_cpu_car_ops to clk.c 2. definition of reset functions to clk-peripheral.c 3. change parent of cpu clock. 4. Remove legacy clock initialization. 5. Initialize clocks using DT. 6. Remove all instance of mach/clk.h Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com> [swarren: use to_clk_periph_gate().] Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-01-11 00:46:26 -07:00
/* Global data of Tegra CPU CAR ops */
clk: tegra: provide dummy cpu car ops tegra_boot_secondary() relies on some of the car ops. This means having an uninitialized tegra_cpu_car_ops will lead to an early boot panic. Providing a dummy struct avoids this and makes adding Tegra114 clock support in a bisectable way a lot easier. Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-04-03 08:40:35 -06:00
static struct tegra_cpu_car_ops dummy_car_ops;
struct tegra_cpu_car_ops *tegra_cpu_car_ops = &dummy_car_ops;
ARM: tegra: migrate to new clock code Migrate Tegra clock support to drivers/clk/tegra, this involves moving: 1. definition of tegra_cpu_car_ops to clk.c 2. definition of reset functions to clk-peripheral.c 3. change parent of cpu clock. 4. Remove legacy clock initialization. 5. Initialize clocks using DT. 6. Remove all instance of mach/clk.h Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com> [swarren: use to_clk_periph_gate().] Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-01-11 00:46:26 -07:00
clk: tegra: simplify periph clock data This patch determines the register bank for clock enable/disable and reset based on the clock ID instead of hardcoding it in the tables describing the clocks. This results in less data to be maintained in the tables, making the code easier to understand. The full benefit of the change will be realized once also other clocktypes will be table based. Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
2013-08-22 09:44:06 -06:00
static int periph_banks;
static struct tegra_clk_periph_regs periph_regs[] = {
[0] = {
.enb_reg = CLK_OUT_ENB_L,
.enb_set_reg = CLK_OUT_ENB_SET_L,
.enb_clr_reg = CLK_OUT_ENB_CLR_L,
.rst_reg = RST_DEVICES_L,
.rst_set_reg = RST_DEVICES_SET_L,
.rst_clr_reg = RST_DEVICES_CLR_L,
},
[1] = {
.enb_reg = CLK_OUT_ENB_H,
.enb_set_reg = CLK_OUT_ENB_SET_H,
.enb_clr_reg = CLK_OUT_ENB_CLR_H,
.rst_reg = RST_DEVICES_H,
.rst_set_reg = RST_DEVICES_SET_H,
.rst_clr_reg = RST_DEVICES_CLR_H,
},
[2] = {
.enb_reg = CLK_OUT_ENB_U,
.enb_set_reg = CLK_OUT_ENB_SET_U,
.enb_clr_reg = CLK_OUT_ENB_CLR_U,
.rst_reg = RST_DEVICES_U,
.rst_set_reg = RST_DEVICES_SET_U,
.rst_clr_reg = RST_DEVICES_CLR_U,
},
[3] = {
.enb_reg = CLK_OUT_ENB_V,
.enb_set_reg = CLK_OUT_ENB_SET_V,
.enb_clr_reg = CLK_OUT_ENB_CLR_V,
.rst_reg = RST_DEVICES_V,
.rst_set_reg = RST_DEVICES_SET_V,
.rst_clr_reg = RST_DEVICES_CLR_V,
},
[4] = {
.enb_reg = CLK_OUT_ENB_W,
.enb_set_reg = CLK_OUT_ENB_SET_W,
.enb_clr_reg = CLK_OUT_ENB_CLR_W,
.rst_reg = RST_DEVICES_W,
.rst_set_reg = RST_DEVICES_SET_W,
.rst_clr_reg = RST_DEVICES_CLR_W,
},
};
struct tegra_clk_periph_regs *get_reg_bank(int clkid)
{
int reg_bank = clkid / 32;
if (reg_bank < periph_banks)
return &periph_regs[reg_bank];
else {
WARN_ON(1);
return NULL;
}
}
int __init tegra_clk_set_periph_banks(int num)
{
if (num > ARRAY_SIZE(periph_regs))
return -EINVAL;
periph_banks = num;
return 0;
}
clk: tegra: add Tegra specific clocks 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>
2013-01-11 00:46:20 -07:00
void __init tegra_init_dup_clks(struct tegra_clk_duplicate *dup_list,
struct clk *clks[], int clk_max)
{
struct clk *clk;
for (; dup_list->clk_id < clk_max; dup_list++) {
clk = clks[dup_list->clk_id];
dup_list->lookup.clk = clk;
clkdev_add(&dup_list->lookup);
}
}
void __init tegra_init_from_table(struct tegra_clk_init_table *tbl,
struct clk *clks[], int clk_max)
{
struct clk *clk;
for (; tbl->clk_id < clk_max; tbl++) {
clk = clks[tbl->clk_id];
if (IS_ERR_OR_NULL(clk))
return;
if (tbl->parent_id < clk_max) {
struct clk *parent = clks[tbl->parent_id];
if (clk_set_parent(clk, parent)) {
pr_err("%s: Failed to set parent %s of %s\n",
__func__, __clk_get_name(parent),
__clk_get_name(clk));
WARN_ON(1);
}
}
if (tbl->rate)
if (clk_set_rate(clk, tbl->rate)) {
pr_err("%s: Failed to set rate %lu of %s\n",
__func__, tbl->rate,
__clk_get_name(clk));
WARN_ON(1);
}
if (tbl->state)
if (clk_prepare_enable(clk)) {
pr_err("%s: Failed to enable %s\n", __func__,
__clk_get_name(clk));
WARN_ON(1);
}
}
}
ARM: tegra: migrate to new clock code Migrate Tegra clock support to drivers/clk/tegra, this involves moving: 1. definition of tegra_cpu_car_ops to clk.c 2. definition of reset functions to clk-peripheral.c 3. change parent of cpu clock. 4. Remove legacy clock initialization. 5. Initialize clocks using DT. 6. Remove all instance of mach/clk.h Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com> [swarren: use to_clk_periph_gate().] Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-01-11 00:46:26 -07:00
clk: tegra: defer application of init table The Tegra clock driver is initialized during the ARM machine descriptor's .init_irq() hook. It can't be initialized earlier, since dynamic memory usage is required. It can't be initialized later, since the .init_timer() hook needs the clocks initialized. However, at this time, udelay() doesn't work. The Tegra clock initialization table may enable some PLLs. Enabling a PLL may require usage of udelay(). Hence, this can't happen right when the clock driver is initialized. To solve this, separate the clock driver initialization from the clock table processing, so they can execute at separate times. Signed-off-by: Stephen Warren <swarren@nvidia.com>
2013-03-25 13:22:24 -06:00
tegra_clk_apply_init_table_func tegra_clk_apply_init_table;
void __init tegra_clocks_apply_init_table(void)
{
if (!tegra_clk_apply_init_table)
return;
tegra_clk_apply_init_table();
}