[PATCH v2 03/11] clk: rockchip: add clock type for pll clocks and pll used on rk3066
Heiko Stübner
heiko at sntech.de
Wed May 7 14:12:11 PDT 2014
All known Rockchip SoCs down to the RK28xx (ARM9) use a similar pattern to
handle plls. 1 or more pll-dependant setting registers, a shared pll mode
register and the pll lock status in a register somewhere else.
Therefore add shared infrastructure to handle the common pll actions and
also the pll type used in rk3066 and rk3188 Cortex-A9 SoCs as well as the
upcoming rk3288.
Signed-off-by: Heiko Stuebner <heiko at sntech.de>
---
drivers/clk/rockchip/Makefile | 1 +
drivers/clk/rockchip/clk-pll.c | 316 +++++++++++++++++++++++++++++++++++++++++
drivers/clk/rockchip/clk.c | 19 +++
drivers/clk/rockchip/clk.h | 68 +++++++++
4 files changed, 404 insertions(+)
create mode 100644 drivers/clk/rockchip/clk-pll.c
diff --git a/drivers/clk/rockchip/Makefile b/drivers/clk/rockchip/Makefile
index 0068a8b..2cb9164 100644
--- a/drivers/clk/rockchip/Makefile
+++ b/drivers/clk/rockchip/Makefile
@@ -4,3 +4,4 @@
obj-y += clk-rockchip.o
obj-y += clk.o
+obj-y += clk-pll.o
diff --git a/drivers/clk/rockchip/clk-pll.c b/drivers/clk/rockchip/clk-pll.c
new file mode 100644
index 0000000..f22bbaa
--- /dev/null
+++ b/drivers/clk/rockchip/clk-pll.c
@@ -0,0 +1,316 @@
+/*
+ * Copyright (c) 2014 MundoReader S.L.
+ * Author: Heiko Stuebner <heiko at sntech.de>
+ *
+ * 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.
+ */
+
+#include <asm/div64.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/clk-private.h>
+#include "clk.h"
+
+struct rockchip_clk_pll {
+ struct clk_hw hw;
+ void __iomem *reg_base;
+ void __iomem *reg_mode;
+ unsigned int mode_shift;
+ void __iomem *reg_lock;
+ unsigned int lock_shift;
+ enum rockchip_pll_type type;
+ const struct rockchip_pll_rate_table *rate_table;
+ unsigned int rate_count;
+ spinlock_t *lock;
+};
+
+#define to_clk_pll(_hw) container_of(_hw, struct rockchip_clk_pll, hw)
+
+static const struct rockchip_pll_rate_table *rockchip_get_pll_settings(
+ struct rockchip_clk_pll *pll, unsigned long rate)
+{
+ const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
+ int i;
+
+ for (i = 0; i < pll->rate_count; i++) {
+ if (rate == rate_table[i].rate)
+ return &rate_table[i];
+ }
+
+ return NULL;
+}
+
+static long rockchip_pll_round_rate(struct clk_hw *hw,
+ unsigned long drate, unsigned long *prate)
+{
+ struct rockchip_clk_pll *pll = to_clk_pll(hw);
+ const struct rockchip_pll_rate_table *rate_table = pll->rate_table;
+ int i;
+
+ /*
+ * For anything smaller or equal to the parent rate, we can only
+ * bypass the pll, so the parent_rate is the lowest we can get.
+ */
+ if (drate <= *prate)
+ return *prate;
+
+ /* Assumming rate_table is in descending order */
+ for (i = 0; i < pll->rate_count; i++) {
+ if (drate >= rate_table[i].rate)
+ return rate_table[i].rate;
+ }
+
+ /* return minimum supported value */
+ return rate_table[i - 1].rate;
+}
+
+static int rockchip_pll_wait_lock(struct rockchip_clk_pll *pll)
+{
+ int delay = 24000000;
+
+ while (delay > 0) {
+ if (readl(pll->reg_lock) & BIT(pll->lock_shift))
+ return 0;
+ delay--;
+ }
+
+ pr_err("%s: timeout waiting for pll to lock\n", __func__);
+ return -ETIMEDOUT;
+}
+
+/**
+ * PLL used in RK3066 and RK3188
+ */
+
+#define RK3066_PLL_MODE_MASK 0x3
+#define RK3066_PLL_MODE_SLOW 0x0
+#define RK3066_PLL_MODE_NORM 0x1
+#define RK3066_PLL_MODE_DEEP 0x2
+
+#define RK3066_PLL_RESET_DELAY(nr) ((nr * 500) / 24 + 1)
+
+#define RK3066_PLLCON(i) (i * 0x4)
+
+#define RK3066_PLLCON0_OD_MASK 0xf
+#define RK3066_PLLCON0_OD_SHIFT 0
+#define RK3066_PLLCON0_NR_MASK 0x3f
+#define RK3066_PLLCON0_NR_SHIFT 8
+
+#define RK3066_PLLCON1_NF_MASK 0x1fff
+#define RK3066_PLLCON1_NF_SHIFT 0
+
+#define RK3066_PLLCON2_BWADJ_MASK 0xfff
+#define RK3066_PLLCON2_BWADJ_SHIFT 0
+
+#define RK3066_PLLCON3_RESET (1 << 5)
+#define RK3066_PLLCON3_PWRDOWN (1 << 1)
+#define RK3066_PLLCON3_BYPASS (1 << 0)
+
+static unsigned long rockchip_rk3066_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long prate)
+{
+ struct rockchip_clk_pll *pll = to_clk_pll(hw);
+ u64 nf, nr, no, rate64 = prate;
+ u32 pllcon;
+
+ pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(3));
+ if (pllcon & RK3066_PLLCON3_BYPASS) {
+ pr_debug("%s: pll %s is bypassed\n", __func__,
+ __clk_get_name(hw->clk));
+ return prate;
+ }
+
+ pllcon = readl_relaxed(pll->reg_mode) >> pll->mode_shift;
+ pllcon &= RK3066_PLL_MODE_MASK;
+ switch (pllcon) {
+ case RK3066_PLL_MODE_NORM:
+ /* calculate the PLL rate below */
+ break;
+ case RK3066_PLL_MODE_SLOW:
+ return prate;
+ case RK3066_PLL_MODE_DEEP:
+ pr_warn("%s: deep slow mode for pll %s currently unknown, assuming parent rate\n",
+ __func__, __clk_get_name(hw->clk));
+ return prate;
+ }
+
+ pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(1));
+ nf = (pllcon >> RK3066_PLLCON1_NF_SHIFT) & RK3066_PLLCON1_NF_MASK;
+
+ pllcon = readl_relaxed(pll->reg_base + RK3066_PLLCON(0));
+ nr = (pllcon >> RK3066_PLLCON0_NR_SHIFT) & RK3066_PLLCON0_NR_MASK;
+ no = (pllcon >> RK3066_PLLCON0_OD_SHIFT) & RK3066_PLLCON0_OD_MASK;
+
+ rate64 *= (nf + 1);
+ do_div(rate64, nr + 1);
+ do_div(rate64, no + 1);
+
+ return (unsigned long)rate64;
+}
+
+static int rockchip_rk3066_pll_set_rate(struct clk_hw *hw, unsigned long drate,
+ unsigned long prate)
+{
+ struct rockchip_clk_pll *pll = to_clk_pll(hw);
+ const struct rockchip_pll_rate_table *rate;
+ unsigned long old_rate = rockchip_rk3066_pll_recalc_rate(hw, prate);
+ int ret;
+
+ pr_debug("%s: changing %s from %lu to %lu with a parent rate of %lu\n",
+ __func__, __clk_get_name(hw->clk), old_rate, drate, prate);
+
+ if (drate == prate) {
+ writel(HIWORD_UPDATE(RK3066_PLL_MODE_SLOW, RK3066_PLL_MODE_MASK,
+ pll->mode_shift),
+ pll->reg_mode);
+
+ /* powerdown the pll, as it is unused */
+ writel(HIWORD_UPDATE(RK3066_PLLCON3_PWRDOWN,
+ RK3066_PLLCON3_PWRDOWN, 0),
+ pll->reg_base + RK3066_PLLCON(3));
+
+ return 0;
+ }
+
+ /* need to powerup the pll first */
+ if (old_rate == prate)
+ writel(HIWORD_UPDATE(0, RK3066_PLLCON3_PWRDOWN, 0),
+ pll->reg_base + RK3066_PLLCON(3));
+
+ /* Get required rate settings from table */
+ rate = rockchip_get_pll_settings(pll, drate);
+ if (!rate) {
+ pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+ drate, __clk_get_name(hw->clk));
+ return -EINVAL;
+ }
+
+ pr_debug("%s: rate settings for %lu (nr, no, nf): (%d, %d, %d)\n",
+ __func__, rate->rate, rate->nr, rate->no, rate->nf);
+
+ /* put pll in slow mode and enter reset afterwards */
+ writel(HIWORD_UPDATE(RK3066_PLL_MODE_SLOW, RK3066_PLL_MODE_MASK,
+ pll->mode_shift), pll->reg_mode);
+ writel(HIWORD_UPDATE(RK3066_PLLCON3_RESET, RK3066_PLLCON3_RESET, 0),
+ pll->reg_base + RK3066_PLLCON(3));
+
+ /* update pll values */
+ writel(HIWORD_UPDATE(rate->nr - 1, RK3066_PLLCON0_NR_MASK,
+ RK3066_PLLCON0_NR_SHIFT) |
+ HIWORD_UPDATE(rate->no - 1, RK3066_PLLCON0_OD_MASK,
+ RK3066_PLLCON0_OD_SHIFT),
+ pll->reg_base + RK3066_PLLCON(0));
+
+ writel_relaxed(HIWORD_UPDATE(rate->nf - 1, RK3066_PLLCON1_NF_MASK,
+ RK3066_PLLCON1_NF_SHIFT),
+ pll->reg_base + RK3066_PLLCON(1));
+ writel_relaxed(HIWORD_UPDATE(rate->bwadj, RK3066_PLLCON2_BWADJ_MASK,
+ RK3066_PLLCON2_BWADJ_SHIFT),
+ pll->reg_base + RK3066_PLLCON(2));
+
+ /* leave reset and wait the reset_delay */
+ writel(HIWORD_UPDATE(0, RK3066_PLLCON3_RESET, 0),
+ pll->reg_base + RK3066_PLLCON(3));
+ udelay(RK3066_PLL_RESET_DELAY(rate->nr));
+
+ /* wait for the pll to lock */
+ ret = rockchip_pll_wait_lock(pll);
+ if (ret) {
+ pr_warn("%s: trying to restore old rate %lu\n",
+ __func__, old_rate);
+ rockchip_rk3066_pll_set_rate(hw, old_rate, prate);
+ }
+
+ /* go back to normal mode */
+ writel(HIWORD_UPDATE(RK3066_PLL_MODE_NORM, RK3066_PLL_MODE_MASK,
+ pll->mode_shift), pll->reg_mode);
+
+ return ret;
+}
+
+static const struct clk_ops rockchip_rk3066_pll_clk_ro_ops = {
+ .recalc_rate = rockchip_rk3066_pll_recalc_rate,
+};
+
+static const struct clk_ops rockchip_rk3066_pll_clk_ops = {
+ .recalc_rate = rockchip_rk3066_pll_recalc_rate,
+ .round_rate = rockchip_pll_round_rate,
+ .set_rate = rockchip_rk3066_pll_set_rate,
+};
+
+struct clk *rockchip_clk_register_pll(struct rockchip_pll_clock *pll_clk,
+ void __iomem *base, void __iomem *reg_lock,
+ spinlock_t *lock)
+{
+ struct rockchip_clk_pll *pll;
+ struct clk *clk;
+ struct clk_init_data init;
+ int len;
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll) {
+ pr_err("%s: could not allocate pll clk %s\n",
+ __func__, pll_clk->name);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ init.name = pll_clk->name;
+ init.flags = pll_clk->flags;
+ init.parent_names = &pll_clk->parent_name;
+ init.num_parents = 1;
+
+ if (pll_clk->rate_table) {
+ /* find count of rates in rate_table */
+ for (len = 0; pll_clk->rate_table[len].rate != 0; )
+ len++;
+
+ pll->rate_count = len;
+ pll->rate_table = kmemdup(pll_clk->rate_table,
+ pll->rate_count *
+ sizeof(struct rockchip_pll_rate_table),
+ GFP_KERNEL);
+ WARN(!pll->rate_table,
+ "%s: could not allocate rate table for %s\n",
+ __func__, pll_clk->name);
+ }
+
+ switch (pll_clk->type) {
+ case pll_rk3066:
+ if (!pll->rate_table)
+ init.ops = &rockchip_rk3066_pll_clk_ro_ops;
+ else
+ init.ops = &rockchip_rk3066_pll_clk_ops;
+ break;
+ default:
+ pr_warn("%s: Unknown pll type for pll clk %s\n",
+ __func__, pll_clk->name);
+ }
+
+ pll->hw.init = &init;
+ pll->type = pll_clk->type;
+ pll->reg_base = base + pll_clk->con_offset;
+ pll->reg_mode = base + pll_clk->mode_offset;
+ pll->mode_shift = pll_clk->mode_shift;
+ pll->reg_lock = reg_lock;
+ pll->lock_shift = pll_clk->lock_shift;
+ pll->lock = lock;
+
+ clk = clk_register(NULL, &pll->hw);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to register pll clock %s : %ld\n",
+ __func__, pll_clk->name, PTR_ERR(clk));
+ kfree(pll);
+ }
+
+ return clk;
+}
diff --git a/drivers/clk/rockchip/clk.c b/drivers/clk/rockchip/clk.c
index b71413e..53e604d 100644
--- a/drivers/clk/rockchip/clk.c
+++ b/drivers/clk/rockchip/clk.c
@@ -55,6 +55,25 @@ void rockchip_clk_add_lookup(struct clk *clk, unsigned int id)
clk_table[id] = clk;
}
+void __init rockchip_clk_register_plls(struct rockchip_pll_clock *list,
+ unsigned int nr_pll, void __iomem *reg_lock)
+{
+ struct clk *clk;
+ int idx;
+
+ for (idx = 0; idx < nr_pll; idx++, list++) {
+ clk = rockchip_clk_register_pll(list, reg_base, reg_lock,
+ &clk_lock);
+ if (IS_ERR(clk)) {
+ pr_err("%s: failed to register clock %s\n", __func__,
+ list->name);
+ continue;
+ }
+
+ rockchip_clk_add_lookup(clk, list->id);
+ }
+}
+
void __init rockchip_clk_register_mux(struct rockchip_mux_clock *list,
unsigned int nr_clk)
{
diff --git a/drivers/clk/rockchip/clk.h b/drivers/clk/rockchip/clk.h
index 2b42c8b..a345c43 100644
--- a/drivers/clk/rockchip/clk.h
+++ b/drivers/clk/rockchip/clk.h
@@ -39,6 +39,72 @@
#define RK2928_GLB_SRST_SND 0x104
#define RK2928_SOFTRST_CON(x) (x * 0x4 + 0x110)
+enum rockchip_pll_type {
+ pll_rk3066,
+};
+
+#define RK3066_PLL_RATE(_rate, _nr, _nf, _no) \
+{ \
+ .rate = _rate##U, \
+ .nr = _nr, \
+ .nf = _nf, \
+ .no = _no, \
+ .bwadj = (_nf >> 1), \
+}
+
+struct rockchip_pll_rate_table {
+ unsigned long rate;
+ unsigned int nr;
+ unsigned int nf;
+ unsigned int no;
+ unsigned int bwadj;
+};
+
+/**
+ * struct rockchip_pll_clock: information about pll clock
+ * @id: platform specific id of the clock.
+ * @name: name of this pll clock.
+ * @parent_name: name of the parent clock.
+ * @flags: optional flags for basic clock.
+ * @con_offset: offset of the register for configuring the PLL.
+ * @mode_offset: offset of the register for configuring the PLL-mode.
+ * @mode_shift: offset inside the mode-register for the mode of this pll.
+ * @lock_shift: offset inside the lock register for the lock status.
+ * @type: Type of PLL to be registered.
+ * @rate_table: Table of usable pll rates
+ */
+struct rockchip_pll_clock {
+ unsigned int id;
+ const char *name;
+ const char *parent_name;
+ unsigned long flags;
+ int con_offset;
+ int mode_offset;
+ int mode_shift;
+ int lock_shift;
+ enum rockchip_pll_type type;
+ struct rockchip_pll_rate_table *rate_table;
+};
+
+#define PLL(_type, _id, _name, _pname, _flags, _con, _mode, _mshift, \
+ _lshift, _rtable) \
+ { \
+ .id = _id, \
+ .type = _type, \
+ .name = _name, \
+ .parent_name = _pname, \
+ .flags = CLK_GET_RATE_NOCACHE | _flags, \
+ .con_offset = _con, \
+ .mode_offset = _mode, \
+ .mode_shift = _mshift, \
+ .lock_shift = _lshift, \
+ .rate_table = _rtable, \
+ }
+
+struct clk *rockchip_clk_register_pll(struct rockchip_pll_clock *pll_clk,
+ void __iomem *base, void __iomem *reg_lock,
+ spinlock_t *lock);
+
#define PNAME(x) static const char *x[] __initconst
/**
@@ -156,5 +222,7 @@ void rockchip_clk_register_div(struct rockchip_div_clock *clk_list,
unsigned int nr_clk);
void rockchip_clk_register_gate(struct rockchip_gate_clock *clk_list,
unsigned int nr_clk);
+void rockchip_clk_register_plls(struct rockchip_pll_clock *pll_list,
+ unsigned int nr_pll, void __iomem *reg_lock);
#endif
--
1.9.0
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