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-rw-r--r--drivers/clk/davinci/pll.c1000
1 files changed, 1000 insertions, 0 deletions
diff --git a/drivers/clk/davinci/pll.c b/drivers/clk/davinci/pll.c
new file mode 100644
index 000000000..f862f5e2b
--- /dev/null
+++ b/drivers/clk/davinci/pll.c
@@ -0,0 +1,1000 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PLL clock driver for TI Davinci SoCs
+ *
+ * Copyright (C) 2018 David Lechner <david@lechnology.com>
+ *
+ * Based on arch/arm/mach-davinci/clock.c
+ * Copyright (C) 2006-2007 Texas Instruments.
+ * Copyright (C) 2008-2009 Deep Root Systems, LLC
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk.h>
+#include <linux/clk/davinci.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/notifier.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of.h>
+#include <linux/platform_data/clk-davinci-pll.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include "pll.h"
+
+#define MAX_NAME_SIZE 20
+#define OSCIN_CLK_NAME "oscin"
+
+#define REVID 0x000
+#define PLLCTL 0x100
+#define OCSEL 0x104
+#define PLLSECCTL 0x108
+#define PLLM 0x110
+#define PREDIV 0x114
+#define PLLDIV1 0x118
+#define PLLDIV2 0x11c
+#define PLLDIV3 0x120
+#define OSCDIV 0x124
+#define POSTDIV 0x128
+#define BPDIV 0x12c
+#define PLLCMD 0x138
+#define PLLSTAT 0x13c
+#define ALNCTL 0x140
+#define DCHANGE 0x144
+#define CKEN 0x148
+#define CKSTAT 0x14c
+#define SYSTAT 0x150
+#define PLLDIV4 0x160
+#define PLLDIV5 0x164
+#define PLLDIV6 0x168
+#define PLLDIV7 0x16c
+#define PLLDIV8 0x170
+#define PLLDIV9 0x174
+
+#define PLLCTL_PLLEN BIT(0)
+#define PLLCTL_PLLPWRDN BIT(1)
+#define PLLCTL_PLLRST BIT(3)
+#define PLLCTL_PLLDIS BIT(4)
+#define PLLCTL_PLLENSRC BIT(5)
+#define PLLCTL_CLKMODE BIT(8)
+
+/* shared by most *DIV registers */
+#define DIV_RATIO_SHIFT 0
+#define DIV_RATIO_WIDTH 5
+#define DIV_ENABLE_SHIFT 15
+
+#define PLLCMD_GOSET BIT(0)
+#define PLLSTAT_GOSTAT BIT(0)
+
+#define CKEN_OBSCLK_SHIFT 1
+#define CKEN_AUXEN_SHIFT 0
+
+/*
+ * OMAP-L138 system reference guide recommends a wait for 4 OSCIN/CLKIN
+ * cycles to ensure that the PLLC has switched to bypass mode. Delay of 1us
+ * ensures we are good for all > 4MHz OSCIN/CLKIN inputs. Typically the input
+ * is ~25MHz. Units are micro seconds.
+ */
+#define PLL_BYPASS_TIME 1
+
+/* From OMAP-L138 datasheet table 6-4. Units are micro seconds */
+#define PLL_RESET_TIME 1
+
+/*
+ * From OMAP-L138 datasheet table 6-4; assuming prediv = 1, sqrt(pllm) = 4
+ * Units are micro seconds.
+ */
+#define PLL_LOCK_TIME 20
+
+/**
+ * struct davinci_pll_clk - Main PLL clock (aka PLLOUT)
+ * @hw: clk_hw for the pll
+ * @base: Base memory address
+ * @pllm_min: The minimum allowable PLLM[PLLM] value
+ * @pllm_max: The maximum allowable PLLM[PLLM] value
+ * @pllm_mask: Bitmask for PLLM[PLLM] value
+ */
+struct davinci_pll_clk {
+ struct clk_hw hw;
+ void __iomem *base;
+ u32 pllm_min;
+ u32 pllm_max;
+ u32 pllm_mask;
+};
+
+#define to_davinci_pll_clk(_hw) \
+ container_of((_hw), struct davinci_pll_clk, hw)
+
+static unsigned long davinci_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+ unsigned long rate = parent_rate;
+ u32 mult;
+
+ mult = readl(pll->base + PLLM) & pll->pllm_mask;
+ rate *= mult + 1;
+
+ return rate;
+}
+
+static int davinci_pll_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+ struct clk_hw *parent = req->best_parent_hw;
+ unsigned long parent_rate = req->best_parent_rate;
+ unsigned long rate = req->rate;
+ unsigned long best_rate, r;
+ u32 mult;
+
+ /* there is a limited range of valid outputs (see datasheet) */
+ if (rate < req->min_rate)
+ return -EINVAL;
+
+ rate = min(rate, req->max_rate);
+ mult = rate / parent_rate;
+ best_rate = parent_rate * mult;
+
+ /* easy case when there is no PREDIV */
+ if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
+ if (best_rate < req->min_rate)
+ return -EINVAL;
+
+ if (mult < pll->pllm_min || mult > pll->pllm_max)
+ return -EINVAL;
+
+ req->rate = best_rate;
+
+ return 0;
+ }
+
+ /* see if the PREDIV clock can help us */
+ best_rate = 0;
+
+ for (mult = pll->pllm_min; mult <= pll->pllm_max; mult++) {
+ parent_rate = clk_hw_round_rate(parent, rate / mult);
+ r = parent_rate * mult;
+ if (r < req->min_rate)
+ continue;
+ if (r > rate || r > req->max_rate)
+ break;
+ if (r > best_rate) {
+ best_rate = r;
+ req->rate = best_rate;
+ req->best_parent_rate = parent_rate;
+ if (best_rate == rate)
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static int davinci_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+ u32 mult;
+
+ mult = rate / parent_rate;
+ writel(mult - 1, pll->base + PLLM);
+
+ return 0;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static void davinci_pll_debug_init(struct clk_hw *hw, struct dentry *dentry);
+#else
+#define davinci_pll_debug_init NULL
+#endif
+
+static const struct clk_ops davinci_pll_ops = {
+ .recalc_rate = davinci_pll_recalc_rate,
+ .determine_rate = davinci_pll_determine_rate,
+ .set_rate = davinci_pll_set_rate,
+ .debug_init = davinci_pll_debug_init,
+};
+
+/* PLLM works differently on DM365 */
+static unsigned long dm365_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+ unsigned long rate = parent_rate;
+ u32 mult;
+
+ mult = readl(pll->base + PLLM) & pll->pllm_mask;
+ rate *= mult * 2;
+
+ return rate;
+}
+
+static const struct clk_ops dm365_pll_ops = {
+ .recalc_rate = dm365_pll_recalc_rate,
+ .debug_init = davinci_pll_debug_init,
+};
+
+/**
+ * davinci_pll_div_register - common *DIV clock implementation
+ * @dev: The PLL platform device or NULL
+ * @name: the clock name
+ * @parent_name: the parent clock name
+ * @reg: the *DIV register
+ * @fixed: if true, the divider is a fixed value
+ * @flags: bitmap of CLK_* flags from clock-provider.h
+ */
+static struct clk *davinci_pll_div_register(struct device *dev,
+ const char *name,
+ const char *parent_name,
+ void __iomem *reg,
+ bool fixed, u32 flags)
+{
+ const char * const *parent_names = parent_name ? &parent_name : NULL;
+ int num_parents = parent_name ? 1 : 0;
+ const struct clk_ops *divider_ops = &clk_divider_ops;
+ struct clk_gate *gate;
+ struct clk_divider *divider;
+ struct clk *clk;
+ int ret;
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ return ERR_PTR(-ENOMEM);
+
+ gate->reg = reg;
+ gate->bit_idx = DIV_ENABLE_SHIFT;
+
+ divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+ if (!divider) {
+ ret = -ENOMEM;
+ goto err_free_gate;
+ }
+
+ divider->reg = reg;
+ divider->shift = DIV_RATIO_SHIFT;
+ divider->width = DIV_RATIO_WIDTH;
+
+ if (fixed) {
+ divider->flags |= CLK_DIVIDER_READ_ONLY;
+ divider_ops = &clk_divider_ro_ops;
+ }
+
+ clk = clk_register_composite(dev, name, parent_names, num_parents,
+ NULL, NULL, &divider->hw, divider_ops,
+ &gate->hw, &clk_gate_ops, flags);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_free_divider;
+ }
+
+ return clk;
+
+err_free_divider:
+ kfree(divider);
+err_free_gate:
+ kfree(gate);
+
+ return ERR_PTR(ret);
+}
+
+struct davinci_pllen_clk {
+ struct clk_hw hw;
+ void __iomem *base;
+};
+
+#define to_davinci_pllen_clk(_hw) \
+ container_of((_hw), struct davinci_pllen_clk, hw)
+
+static const struct clk_ops davinci_pllen_ops = {
+ /* this clocks just uses the clock notification feature */
+};
+
+/*
+ * The PLL has to be switched into bypass mode while we are chaning the rate,
+ * so we do that on the PLLEN clock since it is the end of the line. This will
+ * switch to bypass before any of the parent clocks (PREDIV, PLL, POSTDIV) are
+ * changed and will switch back to the PLL after the changes have been made.
+ */
+static int davinci_pllen_rate_change(struct notifier_block *nb,
+ unsigned long flags, void *data)
+{
+ struct clk_notifier_data *cnd = data;
+ struct clk_hw *hw = __clk_get_hw(cnd->clk);
+ struct davinci_pllen_clk *pll = to_davinci_pllen_clk(hw);
+ u32 ctrl;
+
+ ctrl = readl(pll->base + PLLCTL);
+
+ if (flags == PRE_RATE_CHANGE) {
+ /* Switch the PLL to bypass mode */
+ ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN);
+ writel(ctrl, pll->base + PLLCTL);
+
+ udelay(PLL_BYPASS_TIME);
+
+ /* Reset and enable PLL */
+ ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS);
+ writel(ctrl, pll->base + PLLCTL);
+ } else {
+ udelay(PLL_RESET_TIME);
+
+ /* Bring PLL out of reset */
+ ctrl |= PLLCTL_PLLRST;
+ writel(ctrl, pll->base + PLLCTL);
+
+ udelay(PLL_LOCK_TIME);
+
+ /* Remove PLL from bypass mode */
+ ctrl |= PLLCTL_PLLEN;
+ writel(ctrl, pll->base + PLLCTL);
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block davinci_pllen_notifier = {
+ .notifier_call = davinci_pllen_rate_change,
+};
+
+/**
+ * davinci_pll_clk_register - Register a PLL clock
+ * @dev: The PLL platform device or NULL
+ * @info: The device-specific clock info
+ * @parent_name: The parent clock name
+ * @base: The PLL's memory region
+ * @cfgchip: CFGCHIP syscon regmap for info->unlock_reg or NULL
+ *
+ * This creates a series of clocks that represent the PLL.
+ *
+ * OSCIN > [PREDIV >] PLL > [POSTDIV >] PLLEN
+ *
+ * - OSCIN is the parent clock (on secondary PLL, may come from primary PLL)
+ * - PREDIV and POSTDIV are optional (depends on the PLL controller)
+ * - PLL is the PLL output (aka PLLOUT)
+ * - PLLEN is the bypass multiplexer
+ *
+ * Returns: The PLLOUT clock or a negative error code.
+ */
+struct clk *davinci_pll_clk_register(struct device *dev,
+ const struct davinci_pll_clk_info *info,
+ const char *parent_name,
+ void __iomem *base,
+ struct regmap *cfgchip)
+{
+ char prediv_name[MAX_NAME_SIZE];
+ char pllout_name[MAX_NAME_SIZE];
+ char postdiv_name[MAX_NAME_SIZE];
+ char pllen_name[MAX_NAME_SIZE];
+ struct clk_init_data init;
+ struct davinci_pll_clk *pllout;
+ struct davinci_pllen_clk *pllen;
+ struct clk *oscin_clk = NULL;
+ struct clk *prediv_clk = NULL;
+ struct clk *pllout_clk;
+ struct clk *postdiv_clk = NULL;
+ struct clk *pllen_clk;
+ int ret;
+
+ if (info->flags & PLL_HAS_CLKMODE) {
+ /*
+ * If a PLL has PLLCTL[CLKMODE], then it is the primary PLL.
+ * We register a clock named "oscin" that serves as the internal
+ * "input clock" domain shared by both PLLs (if there are 2)
+ * and will be the parent clock to the AUXCLK, SYSCLKBP and
+ * OBSCLK domains. NB: The various TRMs use "OSCIN" to mean
+ * a number of different things. In this driver we use it to
+ * mean the signal after the PLLCTL[CLKMODE] switch.
+ */
+ oscin_clk = clk_register_fixed_factor(dev, OSCIN_CLK_NAME,
+ parent_name, 0, 1, 1);
+ if (IS_ERR(oscin_clk))
+ return oscin_clk;
+
+ parent_name = OSCIN_CLK_NAME;
+ }
+
+ if (info->flags & PLL_HAS_PREDIV) {
+ bool fixed = info->flags & PLL_PREDIV_FIXED_DIV;
+ u32 flags = 0;
+
+ snprintf(prediv_name, MAX_NAME_SIZE, "%s_prediv", info->name);
+
+ if (info->flags & PLL_PREDIV_ALWAYS_ENABLED)
+ flags |= CLK_IS_CRITICAL;
+
+ /* Some? DM355 chips don't correctly report the PREDIV value */
+ if (info->flags & PLL_PREDIV_FIXED8)
+ prediv_clk = clk_register_fixed_factor(dev, prediv_name,
+ parent_name, flags, 1, 8);
+ else
+ prediv_clk = davinci_pll_div_register(dev, prediv_name,
+ parent_name, base + PREDIV, fixed, flags);
+ if (IS_ERR(prediv_clk)) {
+ ret = PTR_ERR(prediv_clk);
+ goto err_unregister_oscin;
+ }
+
+ parent_name = prediv_name;
+ }
+
+ /* Unlock writing to PLL registers */
+ if (info->unlock_reg) {
+ if (IS_ERR_OR_NULL(cfgchip))
+ dev_warn(dev, "Failed to get CFGCHIP (%ld)\n",
+ PTR_ERR(cfgchip));
+ else
+ regmap_write_bits(cfgchip, info->unlock_reg,
+ info->unlock_mask, 0);
+ }
+
+ pllout = kzalloc(sizeof(*pllout), GFP_KERNEL);
+ if (!pllout) {
+ ret = -ENOMEM;
+ goto err_unregister_prediv;
+ }
+
+ snprintf(pllout_name, MAX_NAME_SIZE, "%s_pllout", info->name);
+
+ init.name = pllout_name;
+ if (info->flags & PLL_PLLM_2X)
+ init.ops = &dm365_pll_ops;
+ else
+ init.ops = &davinci_pll_ops;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+ init.flags = 0;
+
+ if (info->flags & PLL_HAS_PREDIV)
+ init.flags |= CLK_SET_RATE_PARENT;
+
+ pllout->hw.init = &init;
+ pllout->base = base;
+ pllout->pllm_mask = info->pllm_mask;
+ pllout->pllm_min = info->pllm_min;
+ pllout->pllm_max = info->pllm_max;
+
+ pllout_clk = clk_register(dev, &pllout->hw);
+ if (IS_ERR(pllout_clk)) {
+ ret = PTR_ERR(pllout_clk);
+ goto err_free_pllout;
+ }
+
+ clk_hw_set_rate_range(&pllout->hw, info->pllout_min_rate,
+ info->pllout_max_rate);
+
+ parent_name = pllout_name;
+
+ if (info->flags & PLL_HAS_POSTDIV) {
+ bool fixed = info->flags & PLL_POSTDIV_FIXED_DIV;
+ u32 flags = CLK_SET_RATE_PARENT;
+
+ snprintf(postdiv_name, MAX_NAME_SIZE, "%s_postdiv", info->name);
+
+ if (info->flags & PLL_POSTDIV_ALWAYS_ENABLED)
+ flags |= CLK_IS_CRITICAL;
+
+ postdiv_clk = davinci_pll_div_register(dev, postdiv_name,
+ parent_name, base + POSTDIV, fixed, flags);
+ if (IS_ERR(postdiv_clk)) {
+ ret = PTR_ERR(postdiv_clk);
+ goto err_unregister_pllout;
+ }
+
+ parent_name = postdiv_name;
+ }
+
+ pllen = kzalloc(sizeof(*pllen), GFP_KERNEL);
+ if (!pllen) {
+ ret = -ENOMEM;
+ goto err_unregister_postdiv;
+ }
+
+ snprintf(pllen_name, MAX_NAME_SIZE, "%s_pllen", info->name);
+
+ init.name = pllen_name;
+ init.ops = &davinci_pllen_ops;
+ init.parent_names = &parent_name;
+ init.num_parents = 1;
+ init.flags = CLK_SET_RATE_PARENT;
+
+ pllen->hw.init = &init;
+ pllen->base = base;
+
+ pllen_clk = clk_register(dev, &pllen->hw);
+ if (IS_ERR(pllen_clk)) {
+ ret = PTR_ERR(pllen_clk);
+ goto err_free_pllen;
+ }
+
+ clk_notifier_register(pllen_clk, &davinci_pllen_notifier);
+
+ return pllout_clk;
+
+err_free_pllen:
+ kfree(pllen);
+err_unregister_postdiv:
+ clk_unregister(postdiv_clk);
+err_unregister_pllout:
+ clk_unregister(pllout_clk);
+err_free_pllout:
+ kfree(pllout);
+err_unregister_prediv:
+ clk_unregister(prediv_clk);
+err_unregister_oscin:
+ clk_unregister(oscin_clk);
+
+ return ERR_PTR(ret);
+}
+
+/**
+ * davinci_pll_auxclk_register - Register bypass clock (AUXCLK)
+ * @dev: The PLL platform device or NULL
+ * @name: The clock name
+ * @base: The PLL memory region
+ */
+struct clk *davinci_pll_auxclk_register(struct device *dev,
+ const char *name,
+ void __iomem *base)
+{
+ return clk_register_gate(dev, name, OSCIN_CLK_NAME, 0, base + CKEN,
+ CKEN_AUXEN_SHIFT, 0, NULL);
+}
+
+/**
+ * davinci_pll_sysclkbp_clk_register - Register bypass divider clock (SYSCLKBP)
+ * @dev: The PLL platform device or NULL
+ * @name: The clock name
+ * @base: The PLL memory region
+ */
+struct clk *davinci_pll_sysclkbp_clk_register(struct device *dev,
+ const char *name,
+ void __iomem *base)
+{
+ return clk_register_divider(dev, name, OSCIN_CLK_NAME, 0, base + BPDIV,
+ DIV_RATIO_SHIFT, DIV_RATIO_WIDTH,
+ CLK_DIVIDER_READ_ONLY, NULL);
+}
+
+/**
+ * davinci_pll_obsclk_register - Register oscillator divider clock (OBSCLK)
+ * @dev: The PLL platform device or NULL
+ * @info: The clock info
+ * @base: The PLL memory region
+ */
+struct clk *
+davinci_pll_obsclk_register(struct device *dev,
+ const struct davinci_pll_obsclk_info *info,
+ void __iomem *base)
+{
+ struct clk_mux *mux;
+ struct clk_gate *gate;
+ struct clk_divider *divider;
+ struct clk *clk;
+ u32 oscdiv;
+ int ret;
+
+ mux = kzalloc(sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return ERR_PTR(-ENOMEM);
+
+ mux->reg = base + OCSEL;
+ mux->table = info->table;
+ mux->mask = info->ocsrc_mask;
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate) {
+ ret = -ENOMEM;
+ goto err_free_mux;
+ }
+
+ gate->reg = base + CKEN;
+ gate->bit_idx = CKEN_OBSCLK_SHIFT;
+
+ divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+ if (!divider) {
+ ret = -ENOMEM;
+ goto err_free_gate;
+ }
+
+ divider->reg = base + OSCDIV;
+ divider->shift = DIV_RATIO_SHIFT;
+ divider->width = DIV_RATIO_WIDTH;
+
+ /* make sure divider is enabled just in case bootloader disabled it */
+ oscdiv = readl(base + OSCDIV);
+ oscdiv |= BIT(DIV_ENABLE_SHIFT);
+ writel(oscdiv, base + OSCDIV);
+
+ clk = clk_register_composite(dev, info->name, info->parent_names,
+ info->num_parents,
+ &mux->hw, &clk_mux_ops,
+ &divider->hw, &clk_divider_ops,
+ &gate->hw, &clk_gate_ops, 0);
+
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_free_divider;
+ }
+
+ return clk;
+
+err_free_divider:
+ kfree(divider);
+err_free_gate:
+ kfree(gate);
+err_free_mux:
+ kfree(mux);
+
+ return ERR_PTR(ret);
+}
+
+/* The PLL SYSCLKn clocks have a mechanism for synchronizing rate changes. */
+static int davinci_pll_sysclk_rate_change(struct notifier_block *nb,
+ unsigned long flags, void *data)
+{
+ struct clk_notifier_data *cnd = data;
+ struct clk_hw *hw = __clk_get_hw(clk_get_parent(cnd->clk));
+ struct davinci_pllen_clk *pll = to_davinci_pllen_clk(hw);
+ u32 pllcmd, pllstat;
+
+ switch (flags) {
+ case POST_RATE_CHANGE:
+ /* apply the changes */
+ pllcmd = readl(pll->base + PLLCMD);
+ pllcmd |= PLLCMD_GOSET;
+ writel(pllcmd, pll->base + PLLCMD);
+ fallthrough;
+ case PRE_RATE_CHANGE:
+ /* Wait until for outstanding changes to take effect */
+ do {
+ pllstat = readl(pll->base + PLLSTAT);
+ } while (pllstat & PLLSTAT_GOSTAT);
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block davinci_pll_sysclk_notifier = {
+ .notifier_call = davinci_pll_sysclk_rate_change,
+};
+
+/**
+ * davinci_pll_sysclk_register - Register divider clocks (SYSCLKn)
+ * @dev: The PLL platform device or NULL
+ * @info: The clock info
+ * @base: The PLL memory region
+ */
+struct clk *
+davinci_pll_sysclk_register(struct device *dev,
+ const struct davinci_pll_sysclk_info *info,
+ void __iomem *base)
+{
+ const struct clk_ops *divider_ops = &clk_divider_ops;
+ struct clk_gate *gate;
+ struct clk_divider *divider;
+ struct clk *clk;
+ u32 reg;
+ u32 flags = 0;
+ int ret;
+
+ /* PLLDIVn registers are not entirely consecutive */
+ if (info->id < 4)
+ reg = PLLDIV1 + 4 * (info->id - 1);
+ else
+ reg = PLLDIV4 + 4 * (info->id - 4);
+
+ gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+ if (!gate)
+ return ERR_PTR(-ENOMEM);
+
+ gate->reg = base + reg;
+ gate->bit_idx = DIV_ENABLE_SHIFT;
+
+ divider = kzalloc(sizeof(*divider), GFP_KERNEL);
+ if (!divider) {
+ ret = -ENOMEM;
+ goto err_free_gate;
+ }
+
+ divider->reg = base + reg;
+ divider->shift = DIV_RATIO_SHIFT;
+ divider->width = info->ratio_width;
+ divider->flags = 0;
+
+ if (info->flags & SYSCLK_FIXED_DIV) {
+ divider->flags |= CLK_DIVIDER_READ_ONLY;
+ divider_ops = &clk_divider_ro_ops;
+ }
+
+ /* Only the ARM clock can change the parent PLL rate */
+ if (info->flags & SYSCLK_ARM_RATE)
+ flags |= CLK_SET_RATE_PARENT;
+
+ if (info->flags & SYSCLK_ALWAYS_ENABLED)
+ flags |= CLK_IS_CRITICAL;
+
+ clk = clk_register_composite(dev, info->name, &info->parent_name, 1,
+ NULL, NULL, &divider->hw, divider_ops,
+ &gate->hw, &clk_gate_ops, flags);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto err_free_divider;
+ }
+
+ clk_notifier_register(clk, &davinci_pll_sysclk_notifier);
+
+ return clk;
+
+err_free_divider:
+ kfree(divider);
+err_free_gate:
+ kfree(gate);
+
+ return ERR_PTR(ret);
+}
+
+int of_davinci_pll_init(struct device *dev, struct device_node *node,
+ const struct davinci_pll_clk_info *info,
+ const struct davinci_pll_obsclk_info *obsclk_info,
+ const struct davinci_pll_sysclk_info **div_info,
+ u8 max_sysclk_id,
+ void __iomem *base,
+ struct regmap *cfgchip)
+{
+ struct device_node *child;
+ const char *parent_name;
+ struct clk *clk;
+
+ if (info->flags & PLL_HAS_CLKMODE)
+ parent_name = of_clk_get_parent_name(node, 0);
+ else
+ parent_name = OSCIN_CLK_NAME;
+
+ clk = davinci_pll_clk_register(dev, info, parent_name, base, cfgchip);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "failed to register %s\n", info->name);
+ return PTR_ERR(clk);
+ }
+
+ child = of_get_child_by_name(node, "pllout");
+ if (of_device_is_available(child))
+ of_clk_add_provider(child, of_clk_src_simple_get, clk);
+ of_node_put(child);
+
+ child = of_get_child_by_name(node, "sysclk");
+ if (of_device_is_available(child)) {
+ struct clk_onecell_data *clk_data;
+ struct clk **clks;
+ int n_clks = max_sysclk_id + 1;
+ int i;
+
+ clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
+ if (!clk_data) {
+ of_node_put(child);
+ return -ENOMEM;
+ }
+
+ clks = kmalloc_array(n_clks, sizeof(*clks), GFP_KERNEL);
+ if (!clks) {
+ kfree(clk_data);
+ of_node_put(child);
+ return -ENOMEM;
+ }
+
+ clk_data->clks = clks;
+ clk_data->clk_num = n_clks;
+
+ for (i = 0; i < n_clks; i++)
+ clks[i] = ERR_PTR(-ENOENT);
+
+ for (; *div_info; div_info++) {
+ clk = davinci_pll_sysclk_register(dev, *div_info, base);
+ if (IS_ERR(clk))
+ dev_warn(dev, "failed to register %s (%ld)\n",
+ (*div_info)->name, PTR_ERR(clk));
+ else
+ clks[(*div_info)->id] = clk;
+ }
+ of_clk_add_provider(child, of_clk_src_onecell_get, clk_data);
+ }
+ of_node_put(child);
+
+ child = of_get_child_by_name(node, "auxclk");
+ if (of_device_is_available(child)) {
+ char child_name[MAX_NAME_SIZE];
+
+ snprintf(child_name, MAX_NAME_SIZE, "%s_auxclk", info->name);
+
+ clk = davinci_pll_auxclk_register(dev, child_name, base);
+ if (IS_ERR(clk))
+ dev_warn(dev, "failed to register %s (%ld)\n",
+ child_name, PTR_ERR(clk));
+ else
+ of_clk_add_provider(child, of_clk_src_simple_get, clk);
+ }
+ of_node_put(child);
+
+ child = of_get_child_by_name(node, "obsclk");
+ if (of_device_is_available(child)) {
+ if (obsclk_info)
+ clk = davinci_pll_obsclk_register(dev, obsclk_info, base);
+ else
+ clk = ERR_PTR(-EINVAL);
+
+ if (IS_ERR(clk))
+ dev_warn(dev, "failed to register obsclk (%ld)\n",
+ PTR_ERR(clk));
+ else
+ of_clk_add_provider(child, of_clk_src_simple_get, clk);
+ }
+ of_node_put(child);
+
+ return 0;
+}
+
+static struct davinci_pll_platform_data *davinci_pll_get_pdata(struct device *dev)
+{
+ struct davinci_pll_platform_data *pdata = dev_get_platdata(dev);
+
+ /*
+ * Platform data is optional, so allocate a new struct if one was not
+ * provided. For device tree, this will always be the case.
+ */
+ if (!pdata)
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ /* for device tree, we need to fill in the struct */
+ if (dev->of_node)
+ pdata->cfgchip =
+ syscon_regmap_lookup_by_compatible("ti,da830-cfgchip");
+
+ return pdata;
+}
+
+/* needed in early boot for clocksource/clockevent */
+#ifdef CONFIG_ARCH_DAVINCI_DA850
+CLK_OF_DECLARE(da850_pll0, "ti,da850-pll0", of_da850_pll0_init);
+#endif
+
+static const struct of_device_id davinci_pll_of_match[] = {
+#ifdef CONFIG_ARCH_DAVINCI_DA850
+ { .compatible = "ti,da850-pll1", .data = of_da850_pll1_init },
+#endif
+ { }
+};
+
+static const struct platform_device_id davinci_pll_id_table[] = {
+#ifdef CONFIG_ARCH_DAVINCI_DA830
+ { .name = "da830-pll", .driver_data = (kernel_ulong_t)da830_pll_init },
+#endif
+#ifdef CONFIG_ARCH_DAVINCI_DA850
+ { .name = "da850-pll0", .driver_data = (kernel_ulong_t)da850_pll0_init },
+ { .name = "da850-pll1", .driver_data = (kernel_ulong_t)da850_pll1_init },
+#endif
+#ifdef CONFIG_ARCH_DAVINCI_DM355
+ { .name = "dm355-pll1", .driver_data = (kernel_ulong_t)dm355_pll1_init },
+ { .name = "dm355-pll2", .driver_data = (kernel_ulong_t)dm355_pll2_init },
+#endif
+#ifdef CONFIG_ARCH_DAVINCI_DM365
+ { .name = "dm365-pll1", .driver_data = (kernel_ulong_t)dm365_pll1_init },
+ { .name = "dm365-pll2", .driver_data = (kernel_ulong_t)dm365_pll2_init },
+#endif
+ { }
+};
+
+typedef int (*davinci_pll_init)(struct device *dev, void __iomem *base,
+ struct regmap *cfgchip);
+
+static int davinci_pll_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct davinci_pll_platform_data *pdata;
+ const struct of_device_id *of_id;
+ davinci_pll_init pll_init = NULL;
+ void __iomem *base;
+
+ of_id = of_match_device(davinci_pll_of_match, dev);
+ if (of_id)
+ pll_init = of_id->data;
+ else if (pdev->id_entry)
+ pll_init = (void *)pdev->id_entry->driver_data;
+
+ if (!pll_init) {
+ dev_err(dev, "unable to find driver data\n");
+ return -EINVAL;
+ }
+
+ pdata = davinci_pll_get_pdata(dev);
+ if (!pdata) {
+ dev_err(dev, "missing platform data\n");
+ return -EINVAL;
+ }
+
+ base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ return pll_init(dev, base, pdata->cfgchip);
+}
+
+static struct platform_driver davinci_pll_driver = {
+ .probe = davinci_pll_probe,
+ .driver = {
+ .name = "davinci-pll-clk",
+ .of_match_table = davinci_pll_of_match,
+ },
+ .id_table = davinci_pll_id_table,
+};
+
+static int __init davinci_pll_driver_init(void)
+{
+ return platform_driver_register(&davinci_pll_driver);
+}
+
+/* has to be postcore_initcall because PSC devices depend on PLL parent clocks */
+postcore_initcall(davinci_pll_driver_init);
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+#define DEBUG_REG(n) \
+{ \
+ .name = #n, \
+ .offset = n, \
+}
+
+static const struct debugfs_reg32 davinci_pll_regs[] = {
+ DEBUG_REG(REVID),
+ DEBUG_REG(PLLCTL),
+ DEBUG_REG(OCSEL),
+ DEBUG_REG(PLLSECCTL),
+ DEBUG_REG(PLLM),
+ DEBUG_REG(PREDIV),
+ DEBUG_REG(PLLDIV1),
+ DEBUG_REG(PLLDIV2),
+ DEBUG_REG(PLLDIV3),
+ DEBUG_REG(OSCDIV),
+ DEBUG_REG(POSTDIV),
+ DEBUG_REG(BPDIV),
+ DEBUG_REG(PLLCMD),
+ DEBUG_REG(PLLSTAT),
+ DEBUG_REG(ALNCTL),
+ DEBUG_REG(DCHANGE),
+ DEBUG_REG(CKEN),
+ DEBUG_REG(CKSTAT),
+ DEBUG_REG(SYSTAT),
+ DEBUG_REG(PLLDIV4),
+ DEBUG_REG(PLLDIV5),
+ DEBUG_REG(PLLDIV6),
+ DEBUG_REG(PLLDIV7),
+ DEBUG_REG(PLLDIV8),
+ DEBUG_REG(PLLDIV9),
+};
+
+static void davinci_pll_debug_init(struct clk_hw *hw, struct dentry *dentry)
+{
+ struct davinci_pll_clk *pll = to_davinci_pll_clk(hw);
+ struct debugfs_regset32 *regset;
+
+ regset = kzalloc(sizeof(*regset), GFP_KERNEL);
+ if (!regset)
+ return;
+
+ regset->regs = davinci_pll_regs;
+ regset->nregs = ARRAY_SIZE(davinci_pll_regs);
+ regset->base = pll->base;
+
+ debugfs_create_regset32("registers", 0400, dentry, regset);
+}
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 23:06:04 +0000