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authorSascha Hauer <s.hauer@pengutronix.de>2020-02-06 09:51:22 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2020-02-19 08:30:32 +0100
commit955403e5a295151b04f62b1c27b50cb9ee5a8070 (patch)
treeb39ad876e357d875f46492d2f19862188ba2abdd /drivers
parentd19adc55f607fff299fb54d29aef3396cbdf0baa (diff)
downloadbarebox-955403e5a295151b04f62b1c27b50cb9ee5a8070.tar.gz
clk: imx: Add pll14xx support
This adds support for the pll14xx found on i.MX8MM devices. This is taken from the Kernel as of v5.5. Since we'll need some early setup for the PLL a PBL hook is added to be called from lowlevel code. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/imx/Makefile2
-rw-r--r--drivers/clk/imx/clk-pll14xx.c446
-rw-r--r--drivers/clk/imx/clk.h44
3 files changed, 492 insertions, 0 deletions
diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
index 97ae97a..bd70853 100644
--- a/drivers/clk/imx/Makefile
+++ b/drivers/clk/imx/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_COMMON_CLK) += \
clk-pllv1.o \
clk-pllv2.o \
clk-pllv3.o \
+ clk-pll14xx.o \
clk-pfd.o \
clk-gate2.o \
clk-gate-exclusive.o \
@@ -25,5 +26,6 @@ obj-$(CONFIG_ARCH_IMX6SX) += clk-imx6sx.o
obj-$(CONFIG_ARCH_IMX6SL) += clk-imx6sl.o
obj-$(CONFIG_ARCH_IMX6UL) += clk-imx6ul.o
obj-$(CONFIG_ARCH_IMX7) += clk-imx7.o
+pbl-$(CONFIG_ARCH_IMX8MM) += clk-pll14xx.o
obj-$(CONFIG_ARCH_IMX8MQ) += clk-imx8mq.o
obj-$(CONFIG_ARCH_VF610) += clk-vf610.o
diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
new file mode 100644
index 0000000..91e9624
--- /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;
+}
diff --git a/drivers/clk/imx/clk.h b/drivers/clk/imx/clk.h
index 04286f0..65b9717 100644
--- a/drivers/clk/imx/clk.h
+++ b/drivers/clk/imx/clk.h
@@ -168,6 +168,50 @@ struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
const char *parent, void __iomem *base,
u32 div_mask);
+enum imx_pll14xx_type {
+ PLL_1416X,
+ PLL_1443X,
+};
+
+/* NOTE: Rate table should be kept sorted in descending order. */
+struct imx_pll14xx_rate_table {
+ unsigned int rate;
+ unsigned int pdiv;
+ unsigned int mdiv;
+ unsigned int sdiv;
+ unsigned int kdiv;
+};
+
+#define PLL_1416X_RATE(_rate, _m, _p, _s) \
+ { \
+ .rate = (_rate), \
+ .mdiv = (_m), \
+ .pdiv = (_p), \
+ .sdiv = (_s), \
+ }
+
+#define PLL_1443X_RATE(_rate, _m, _p, _s, _k) \
+ { \
+ .rate = (_rate), \
+ .mdiv = (_m), \
+ .pdiv = (_p), \
+ .sdiv = (_s), \
+ .kdiv = (_k), \
+ }
+
+struct imx_pll14xx_clk {
+ enum imx_pll14xx_type type;
+ const struct imx_pll14xx_rate_table *rate_table;
+ int rate_count;
+ int flags;
+};
+
+extern struct imx_pll14xx_clk imx_1443x_pll;
+extern struct imx_pll14xx_clk imx_1416x_pll;
+
+struct clk *imx_clk_pll14xx(const char *name, const char *parent_name,
+ void __iomem *base, const struct imx_pll14xx_clk *pll_clk);
+
struct clk *imx_clk_frac_pll(const char *name, const char *parent_name,
void __iomem *base);