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path: root/drivers/clk/imx/clk-pll14xx.c
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-rw-r--r--drivers/clk/imx/clk-pll14xx.c446
1 files changed, 446 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
new file mode 100644
index 0000000000..91e9624a60
--- /dev/null
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -0,0 +1,446 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2017-2018 NXP.
+ */
+
+#include <common.h>
+#include <init.h>
+#include <driver.h>
+#include <linux/clk.h>
+#include <io.h>
+#include <linux/clkdev.h>
+#include <linux/err.h>
+#include <linux/iopoll.h>
+#include <malloc.h>
+#include <clock.h>
+#include <soc/imx8m/clk-early.h>
+#include <asm-generic/div64.h>
+
+#include "clk.h"
+
+#define GNRL_CTL 0x0
+#define DIV_CTL 0x4
+#define LOCK_STATUS BIT(31)
+#define LOCK_SEL_MASK BIT(29)
+#define CLKE_MASK BIT(11)
+#define RST_MASK BIT(9)
+#define BYPASS_MASK BIT(4)
+#define MDIV_SHIFT 12
+#define MDIV_MASK GENMASK(21, 12)
+#define PDIV_SHIFT 4
+#define PDIV_MASK GENMASK(9, 4)
+#define SDIV_SHIFT 0
+#define SDIV_MASK GENMASK(2, 0)
+#define KDIV_SHIFT 0
+#define KDIV_MASK GENMASK(15, 0)
+
+#define LOCK_TIMEOUT_US 10000
+
+struct clk_pll14xx {
+ struct clk clk;
+ void __iomem *base;
+ enum imx_pll14xx_type type;
+ const struct imx_pll14xx_rate_table *rate_table;
+ int rate_count;
+ const char *parent;
+};
+
+#define to_clk_pll14xx(clk) container_of(clk, struct clk_pll14xx, clk)
+
+static const struct imx_pll14xx_rate_table imx_pll1416x_tbl[] = {
+ PLL_1416X_RATE(1800000000U, 225, 3, 0),
+ PLL_1416X_RATE(1600000000U, 200, 3, 0),
+ PLL_1416X_RATE(1500000000U, 375, 3, 1),
+ PLL_1416X_RATE(1400000000U, 350, 3, 1),
+ PLL_1416X_RATE(1200000000U, 300, 3, 1),
+ PLL_1416X_RATE(1000000000U, 250, 3, 1),
+ PLL_1416X_RATE(800000000U, 200, 3, 1),
+ PLL_1416X_RATE(750000000U, 250, 2, 2),
+ PLL_1416X_RATE(700000000U, 350, 3, 2),
+ PLL_1416X_RATE(600000000U, 300, 3, 2),
+};
+
+static const struct imx_pll14xx_rate_table imx_pll1443x_tbl[] = {
+ PLL_1443X_RATE(650000000U, 325, 3, 2, 0),
+ PLL_1443X_RATE(594000000U, 198, 2, 2, 0),
+ PLL_1443X_RATE(393216000U, 262, 2, 3, 9437),
+ PLL_1443X_RATE(361267200U, 361, 3, 3, 17511),
+};
+
+struct imx_pll14xx_clk imx_1443x_pll = {
+ .type = PLL_1443X,
+ .rate_table = imx_pll1443x_tbl,
+ .rate_count = ARRAY_SIZE(imx_pll1443x_tbl),
+};
+
+struct imx_pll14xx_clk imx_1416x_pll = {
+ .type = PLL_1416X,
+ .rate_table = imx_pll1416x_tbl,
+ .rate_count = ARRAY_SIZE(imx_pll1416x_tbl),
+};
+
+static const struct imx_pll14xx_rate_table *imx_get_pll_settings(
+ struct clk_pll14xx *pll, unsigned long rate)
+{
+ const struct imx_pll14xx_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 clk_pll14xx_round_rate(struct clk *clk, unsigned long rate,
+ unsigned long *prate)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ const struct imx_pll14xx_rate_table *rate_table = pll->rate_table;
+ int i;
+
+ /* Assumming rate_table is in descending order */
+ for (i = 0; i < pll->rate_count; i++)
+ if (rate >= rate_table[i].rate)
+ return rate_table[i].rate;
+
+ /* return minimum supported value */
+ return rate_table[i - 1].rate;
+}
+
+static unsigned long clk_pll1416x_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ u32 mdiv, pdiv, sdiv, pll_div;
+ u64 fvco = parent_rate;
+
+ pll_div = readl(pll->base + 4);
+ mdiv = (pll_div & MDIV_MASK) >> MDIV_SHIFT;
+ pdiv = (pll_div & PDIV_MASK) >> PDIV_SHIFT;
+ sdiv = (pll_div & SDIV_MASK) >> SDIV_SHIFT;
+
+ fvco *= mdiv;
+ do_div(fvco, pdiv << sdiv);
+
+ return fvco;
+}
+
+static unsigned long clk_pll1443x_recalc_rate(struct clk *clk,
+ unsigned long parent_rate)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ u32 mdiv, pdiv, sdiv, pll_div_ctl0, pll_div_ctl1;
+ short int kdiv;
+ u64 fvco = parent_rate;
+
+ pll_div_ctl0 = readl(pll->base + 4);
+ pll_div_ctl1 = readl(pll->base + 8);
+ mdiv = (pll_div_ctl0 & MDIV_MASK) >> MDIV_SHIFT;
+ pdiv = (pll_div_ctl0 & PDIV_MASK) >> PDIV_SHIFT;
+ sdiv = (pll_div_ctl0 & SDIV_MASK) >> SDIV_SHIFT;
+ kdiv = pll_div_ctl1 & KDIV_MASK;
+
+ /* fvco = (m * 65536 + k) * Fin / (p * 65536) */
+ fvco *= (mdiv * 65536 + kdiv);
+ pdiv *= 65536;
+
+ do_div(fvco, pdiv << sdiv);
+
+ return fvco;
+}
+
+static inline bool clk_pll14xx_mp_change(const struct imx_pll14xx_rate_table *rate,
+ u32 pll_div)
+{
+ u32 old_mdiv, old_pdiv;
+
+ old_mdiv = (pll_div & MDIV_MASK) >> MDIV_SHIFT;
+ old_pdiv = (pll_div & PDIV_MASK) >> PDIV_SHIFT;
+
+ return rate->mdiv != old_mdiv || rate->pdiv != old_pdiv;
+}
+
+static int clk_pll14xx_wait_lock(struct clk_pll14xx *pll)
+{
+ u32 val;
+
+ return readl_poll_timeout(pll->base, val, val & LOCK_STATUS,
+ LOCK_TIMEOUT_US);
+}
+
+static int clk_pll1416x_set_rate(struct clk *clk, unsigned long drate,
+ unsigned long prate)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ const struct imx_pll14xx_rate_table *rate;
+ u32 tmp, div_val;
+ int ret;
+
+ rate = imx_get_pll_settings(pll, drate);
+ if (!rate) {
+ pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+ drate, clk->name);
+ return -EINVAL;
+ }
+
+ tmp = readl(pll->base + 4);
+
+ if (!clk_pll14xx_mp_change(rate, tmp)) {
+ tmp &= ~(SDIV_MASK) << SDIV_SHIFT;
+ tmp |= rate->sdiv << SDIV_SHIFT;
+ writel(tmp, pll->base + 4);
+
+ return 0;
+ }
+
+ /* Bypass clock and set lock to pll output lock */
+ tmp = readl(pll->base);
+ tmp |= LOCK_SEL_MASK;
+ writel(tmp, pll->base);
+
+ /* Enable RST */
+ tmp &= ~RST_MASK;
+ writel(tmp, pll->base);
+
+ /* Enable BYPASS */
+ tmp |= BYPASS_MASK;
+ writel(tmp, pll->base);
+
+ div_val = (rate->mdiv << MDIV_SHIFT) | (rate->pdiv << PDIV_SHIFT) |
+ (rate->sdiv << SDIV_SHIFT);
+ writel(div_val, pll->base + 0x4);
+
+ /*
+ * According to SPEC, t3 - t2 need to be greater than
+ * 1us and 1/FREF, respectively.
+ * FREF is FIN / Prediv, the prediv is [1, 63], so choose
+ * 3us.
+ */
+ udelay(3);
+
+ /* Disable RST */
+ tmp |= RST_MASK;
+ writel(tmp, pll->base);
+
+ /* Wait Lock */
+ ret = clk_pll14xx_wait_lock(pll);
+ if (ret)
+ return ret;
+
+ /* Bypass */
+ tmp &= ~BYPASS_MASK;
+ writel(tmp, pll->base);
+
+ return 0;
+}
+
+int clk_pll1416x_early_set_rate(void __iomem *base, unsigned long drate,
+ unsigned long prate)
+{
+ struct clk_pll14xx pll = {
+ .clk = {
+ .name = "pll1416x",
+ },
+ .base = base,
+ .rate_table = imx_pll1416x_tbl,
+ .rate_count = ARRAY_SIZE(imx_pll1416x_tbl),
+ };
+
+ return clk_pll1416x_set_rate(&pll.clk, drate, prate);
+}
+
+static int clk_pll1443x_set_rate(struct clk *clk, unsigned long drate,
+ unsigned long prate)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ const struct imx_pll14xx_rate_table *rate;
+ u32 tmp, div_val;
+ int ret;
+
+ rate = imx_get_pll_settings(pll, drate);
+ if (!rate) {
+ pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__,
+ drate, clk->name);
+ return -EINVAL;
+ }
+
+ tmp = readl(pll->base + 4);
+
+ if (!clk_pll14xx_mp_change(rate, tmp)) {
+ tmp &= ~(SDIV_MASK) << SDIV_SHIFT;
+ tmp |= rate->sdiv << SDIV_SHIFT;
+ writel(tmp, pll->base + 4);
+
+ tmp = rate->kdiv << KDIV_SHIFT;
+ writel(tmp, pll->base + 8);
+
+ return 0;
+ }
+
+ /* Enable RST */
+ tmp = readl(pll->base);
+ tmp &= ~RST_MASK;
+ writel(tmp, pll->base);
+
+ /* Enable BYPASS */
+ tmp |= BYPASS_MASK;
+ writel(tmp, pll->base);
+
+ div_val = (rate->mdiv << MDIV_SHIFT) | (rate->pdiv << PDIV_SHIFT) |
+ (rate->sdiv << SDIV_SHIFT);
+ writel(div_val, pll->base + 0x4);
+ writel(rate->kdiv << KDIV_SHIFT, pll->base + 0x8);
+
+ /*
+ * According to SPEC, t3 - t2 need to be greater than
+ * 1us and 1/FREF, respectively.
+ * FREF is FIN / Prediv, the prediv is [1, 63], so choose
+ * 3us.
+ */
+ udelay(3);
+
+ /* Disable RST */
+ tmp |= RST_MASK;
+ writel(tmp, pll->base);
+
+ /* Wait Lock*/
+ ret = clk_pll14xx_wait_lock(pll);
+ if (ret)
+ return ret;
+
+ /* Bypass */
+ tmp &= ~BYPASS_MASK;
+ writel(tmp, pll->base);
+
+ return 0;
+}
+
+static int clk_pll14xx_prepare(struct clk *clk)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ u32 val;
+ int ret;
+
+ /*
+ * RESETB = 1 from 0, PLL starts its normal
+ * operation after lock time
+ */
+ val = readl(pll->base + GNRL_CTL);
+ if (val & RST_MASK)
+ return 0;
+ val |= BYPASS_MASK;
+ writel(val, pll->base + GNRL_CTL);
+ val |= RST_MASK;
+ writel(val, pll->base + GNRL_CTL);
+
+ ret = clk_pll14xx_wait_lock(pll);
+ if (ret)
+ return ret;
+
+ val &= ~BYPASS_MASK;
+ writel(val, pll->base + GNRL_CTL);
+
+ return 0;
+}
+
+static int clk_pll14xx_is_prepared(struct clk *clk)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ u32 val;
+
+ val = readl(pll->base + GNRL_CTL);
+
+ return (val & RST_MASK) ? 1 : 0;
+}
+
+static void clk_pll14xx_unprepare(struct clk *clk)
+{
+ struct clk_pll14xx *pll = to_clk_pll14xx(clk);
+ u32 val;
+printf("%s %p\n", __func__, pll);
+printf("%s %p\n", __func__, pll->base);
+ /*
+ * Set RST to 0, power down mode is enabled and
+ * every digital block is reset
+ */
+ val = readl(pll->base + GNRL_CTL);
+ val &= ~RST_MASK;
+ writel(val, pll->base + GNRL_CTL);
+}
+
+static const struct clk_ops clk_pll1416x_ops = {
+ .enable = clk_pll14xx_prepare,
+ .disable = clk_pll14xx_unprepare,
+ .is_enabled = clk_pll14xx_is_prepared,
+ .recalc_rate = clk_pll1416x_recalc_rate,
+ .round_rate = clk_pll14xx_round_rate,
+ .set_rate = clk_pll1416x_set_rate,
+};
+
+static const struct clk_ops clk_pll1416x_min_ops = {
+ .recalc_rate = clk_pll1416x_recalc_rate,
+};
+
+static const struct clk_ops clk_pll1443x_ops = {
+ .enable = clk_pll14xx_prepare,
+ .disable = clk_pll14xx_unprepare,
+ .is_enabled = clk_pll14xx_is_prepared,
+ .recalc_rate = clk_pll1443x_recalc_rate,
+ .round_rate = clk_pll14xx_round_rate,
+ .set_rate = clk_pll1443x_set_rate,
+};
+
+struct clk *imx_clk_pll14xx(const char *name, const char *parent_name,
+ void __iomem *base,
+ const struct imx_pll14xx_clk *pll_clk)
+{
+ struct clk_pll14xx *pll;
+ struct clk *clk;
+ u32 val;
+ int ret;
+
+ pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+ if (!pll)
+ return ERR_PTR(-ENOMEM);
+
+ clk = &pll->clk;
+
+ pll->parent = parent_name;
+ clk->name = name;
+ clk->flags = pll_clk->flags;
+ clk->parent_names = &pll->parent;
+ clk->num_parents = 1;
+
+ switch (pll_clk->type) {
+ case PLL_1416X:
+ if (!pll_clk->rate_table)
+ clk->ops = &clk_pll1416x_min_ops;
+ else
+ clk->ops = &clk_pll1416x_ops;
+ break;
+ case PLL_1443X:
+ clk->ops = &clk_pll1443x_ops;
+ break;
+ default:
+ pr_err("%s: Unknown pll type for pll clk %s\n",
+ __func__, name);
+ };
+
+ pll->base = base;
+ pll->type = pll_clk->type;
+ pll->rate_table = pll_clk->rate_table;
+ pll->rate_count = pll_clk->rate_count;
+
+ val = readl(pll->base + GNRL_CTL);
+ val &= ~BYPASS_MASK;
+ writel(val, pll->base + GNRL_CTL);
+
+ ret = clk_register(clk);
+ if (ret) {
+ free(pll);
+ return ERR_PTR(ret);
+ }
+
+ return clk;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-01 04:19:29 +0000