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-rw-r--r--drivers/clk/clk-qoric.c665
1 files changed, 665 insertions, 0 deletions
diff --git a/drivers/clk/clk-qoric.c b/drivers/clk/clk-qoric.c
new file mode 100644
index 0000000000..c40c6e90d9
--- /dev/null
+++ b/drivers/clk/clk-qoric.c
@@ -0,0 +1,665 @@
+/*
+ * Copyright 2013 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * clock driver for Freescale QorIQ SoCs.
+ */
+
+#define pr_fmt(fmt) "clk-qoric: " fmt
+
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <io.h>
+#include <linux/kernel.h>
+#include <of_address.h>
+#include <of.h>
+#include <asm-generic/div64.h>
+
+#define PLL_DIV1 0
+#define PLL_DIV2 1
+#define PLL_DIV3 2
+#define PLL_DIV4 3
+
+#define PLATFORM_PLL 0
+#define CGA_PLL1 1
+#define CGA_PLL2 2
+#define CGA_PLL3 3
+#define CGA_PLL4 4 /* only on clockgen-1.0, which lacks CGB */
+#define CGB_PLL1 4
+#define CGB_PLL2 5
+
+struct clockgen_pll_div {
+ struct clk *clk;
+ char name[32];
+};
+
+struct clockgen_pll {
+ struct clockgen_pll_div div[8];
+};
+
+#define CLKSEL_VALID 1
+
+struct clockgen_sourceinfo {
+ u32 flags; /* CLKSEL_xxx */
+ int pll; /* CGx_PLLn */
+ int div; /* PLL_DIVn */
+};
+
+#define NUM_MUX_PARENTS 16
+
+struct clockgen_muxinfo {
+ struct clockgen_sourceinfo clksel[NUM_MUX_PARENTS];
+};
+
+#define NUM_HWACCEL 5
+#define NUM_CMUX 8
+
+struct clockgen;
+
+#define CG_PLL_8BIT 2 /* PLLCnGSR[CFG] is 8 bits, not 6 */
+#define CG_VER3 4 /* version 3 cg: reg layout different */
+#define CG_LITTLE_ENDIAN 8
+
+struct clockgen_chipinfo {
+ const char *compat;
+ const struct clockgen_muxinfo *cmux_groups[2];
+ const struct clockgen_muxinfo *hwaccel[NUM_HWACCEL];
+ void (*init_periph)(struct clockgen *cg);
+ int cmux_to_group[NUM_CMUX]; /* -1 terminates if fewer than NUM_CMUX */
+ u32 pll_mask; /* 1 << n bit set if PLL n is valid */
+ u32 flags; /* CG_xxx */
+};
+
+struct clockgen {
+ struct device_node *node;
+ void __iomem *regs;
+ struct clockgen_chipinfo info; /* mutable copy */
+ struct clk *sysclk, *coreclk;
+ struct clockgen_pll pll[6];
+ struct clk *cmux[NUM_CMUX];
+ struct clk *hwaccel[NUM_HWACCEL];
+ struct clk *fman[2];
+};
+
+static struct clockgen clockgen;
+
+static void cg_out(struct clockgen *cg, u32 val, u32 __iomem *reg)
+{
+ if (cg->info.flags & CG_LITTLE_ENDIAN)
+ iowrite32(val, reg);
+ else
+ iowrite32be(val, reg);
+}
+
+static u32 cg_in(struct clockgen *cg, u32 __iomem *reg)
+{
+ u32 val;
+
+ if (cg->info.flags & CG_LITTLE_ENDIAN)
+ val = ioread32(reg);
+ else
+ val = ioread32be(reg);
+
+ return val;
+}
+
+static const struct clockgen_muxinfo t1023_cmux = {
+ {
+ [0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
+ [1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ }
+};
+
+static const struct clockgen_muxinfo t1040_cmux = {
+ {
+ [0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
+ [1] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ [4] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
+ [5] = { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
+ }
+};
+
+static const struct clockgen_muxinfo clockgen2_cmux_cga12 = {
+ {
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
+ {},
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV4 },
+ },
+};
+
+static const struct clockgen_muxinfo clockgen2_cmux_cgb = {
+ {
+ { CLKSEL_VALID, CGB_PLL1, PLL_DIV1 },
+ { CLKSEL_VALID, CGB_PLL1, PLL_DIV2 },
+ { CLKSEL_VALID, CGB_PLL1, PLL_DIV4 },
+ {},
+ { CLKSEL_VALID, CGB_PLL2, PLL_DIV1 },
+ { CLKSEL_VALID, CGB_PLL2, PLL_DIV2 },
+ { CLKSEL_VALID, CGB_PLL2, PLL_DIV4 },
+ },
+};
+
+static const struct clockgen_muxinfo ls1043a_hwa1 = {
+ {
+ {},
+ {},
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
+ {},
+ {},
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
+ },
+};
+
+static const struct clockgen_muxinfo ls1043a_hwa2 = {
+ {
+ {},
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
+ {},
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
+ },
+};
+
+static const struct clockgen_muxinfo ls1046a_hwa1 = {
+ {
+ {},
+ {},
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV3 },
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV4 },
+ { CLKSEL_VALID, PLATFORM_PLL, PLL_DIV1 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
+ },
+};
+
+static const struct clockgen_muxinfo ls1046a_hwa2 = {
+ {
+ {},
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV1 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV2 },
+ { CLKSEL_VALID, CGA_PLL2, PLL_DIV3 },
+ {},
+ {},
+ { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ },
+};
+
+static const struct clockgen_muxinfo ls1012a_cmux = {
+ {
+ [0] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV1 },
+ {},
+ [2] = { CLKSEL_VALID, CGA_PLL1, PLL_DIV2 },
+ }
+};
+
+static void __init t2080_init_periph(struct clockgen *cg)
+{
+ cg->fman[0] = cg->hwaccel[0];
+}
+
+static const struct clockgen_chipinfo chipinfo_ls1021a = {
+ .compat = "fsl,ls1021a-clockgen",
+ .cmux_groups = { &t1023_cmux },
+ .cmux_to_group = { 0, -1 },
+ .pll_mask = 0x03,
+};
+
+static const struct clockgen_chipinfo chipinfo_ls1043a = {
+ .compat = "fsl,ls1043a-clockgen",
+ .init_periph = t2080_init_periph,
+ .cmux_groups = { &t1040_cmux },
+ .hwaccel = { &ls1043a_hwa1, &ls1043a_hwa2 },
+ .cmux_to_group = { 0, -1 },
+ .pll_mask = 0x07,
+ .flags = CG_PLL_8BIT,
+};
+
+static const struct clockgen_chipinfo chipinfo_ls1046a = {
+ .compat = "fsl,ls1046a-clockgen",
+ .init_periph = t2080_init_periph,
+ .cmux_groups = { &t1040_cmux },
+ .hwaccel = { &ls1046a_hwa1, &ls1046a_hwa2 },
+ .cmux_to_group = { 0, -1 },
+ .pll_mask = 0x07,
+ .flags = CG_PLL_8BIT,
+};
+
+static const struct clockgen_chipinfo chipinfo_ls1088a = {
+ .compat = "fsl,ls1088a-clockgen",
+ .cmux_groups = { &clockgen2_cmux_cga12 },
+ .cmux_to_group = { 0, 0, -1 },
+ .pll_mask = 0x07,
+ .flags = CG_VER3 | CG_LITTLE_ENDIAN,
+};
+
+static const struct clockgen_chipinfo chipinfo_ls1012a = {
+ .compat = "fsl,ls1012a-clockgen",
+ .cmux_groups = { &ls1012a_cmux },
+ .cmux_to_group = { 0, -1 },
+ .pll_mask = 0x03,
+};
+
+static const struct clockgen_chipinfo chipinfo_ls2080a = {
+ .compat = "fsl,ls2080a-clockgen",
+ .cmux_groups = { &clockgen2_cmux_cga12, &clockgen2_cmux_cgb },
+ .cmux_to_group = { 0, 0, 1, 1, -1 },
+ .pll_mask = 0x37,
+ .flags = CG_VER3 | CG_LITTLE_ENDIAN,
+};
+
+struct mux_hwclock {
+ struct clk clk;
+ struct clockgen *cg;
+ const struct clockgen_muxinfo *info;
+ u32 __iomem *reg;
+ int num_parents;
+};
+
+#define to_mux_hwclock(p) container_of(p, struct mux_hwclock, clk)
+#define CLKSEL_MASK 0x78000000
+#define CLKSEL_SHIFT 27
+
+static int mux_set_parent(struct clk *clk, u8 idx)
+{
+ struct mux_hwclock *hwc = to_mux_hwclock(clk);
+
+ if (idx >= hwc->num_parents)
+ return -EINVAL;
+
+ cg_out(hwc->cg, (idx << CLKSEL_SHIFT) & CLKSEL_MASK, hwc->reg);
+
+ return 0;
+}
+
+static int mux_get_parent(struct clk *clk)
+{
+ struct mux_hwclock *hwc = to_mux_hwclock(clk);
+
+ return (cg_in(hwc->cg, hwc->reg) & CLKSEL_MASK) >> CLKSEL_SHIFT;
+}
+
+static const struct clk_ops cmux_ops = {
+ .get_parent = mux_get_parent,
+ .set_parent = mux_set_parent,
+};
+
+/*
+ * Don't allow setting for now, as the clock options haven't been
+ * sanitized for additional restrictions.
+ */
+static const struct clk_ops hwaccel_ops = {
+ .get_parent = mux_get_parent,
+};
+
+static const struct clockgen_pll_div *get_pll_div(struct clockgen *cg,
+ struct mux_hwclock *hwc,
+ int idx)
+{
+ const struct clockgen_sourceinfo *clksel = &hwc->info->clksel[idx];
+ int pll, div;
+
+ if (!(clksel->flags & CLKSEL_VALID))
+ return NULL;
+
+ pll = clksel->pll;
+ div = clksel->div;
+
+ return &cg->pll[pll].div[div];
+}
+
+static struct clk * __init create_mux_common(struct clockgen *cg,
+ struct mux_hwclock *hwc,
+ const struct clk_ops *ops,
+ const char *fmt, int idx)
+{
+ struct clk *clk = &hwc->clk;
+ const struct clockgen_pll_div *div;
+ const char **parent_names;
+ int i, ret;
+
+ parent_names = xzalloc(sizeof(char *) * NUM_MUX_PARENTS);
+
+ for (i = 0; i < NUM_MUX_PARENTS; i++) {
+ div = get_pll_div(cg, hwc, i);
+ if (!div)
+ continue;
+
+ parent_names[i] = div->name;
+ }
+
+ clk->name = xasprintf(fmt, idx);;
+ clk->ops = ops;
+ clk->parent_names = parent_names;
+ clk->num_parents = hwc->num_parents = i;
+ hwc->cg = cg;
+
+ ret = clk_register(clk);
+ if (ret) {
+ pr_err("%s: Couldn't register %s: %d\n", __func__, clk->name, ret);
+ kfree(hwc);
+ return NULL;
+ }
+
+ return clk;
+}
+
+static struct clk * __init create_one_cmux(struct clockgen *cg, int idx)
+{
+ struct mux_hwclock *hwc;
+ const struct clockgen_pll_div *div;
+ u32 clksel;
+
+ hwc = xzalloc(sizeof(*hwc));
+
+ if (cg->info.flags & CG_VER3)
+ hwc->reg = cg->regs + 0x70000 + 0x20 * idx;
+ else
+ hwc->reg = cg->regs + 0x20 * idx;
+
+ hwc->info = cg->info.cmux_groups[cg->info.cmux_to_group[idx]];
+
+ /*
+ * Find the rate for the default clksel, and treat it as the
+ * maximum rated core frequency. If this is an incorrect
+ * assumption, certain clock options (possibly including the
+ * default clksel) may be inappropriately excluded on certain
+ * chips.
+ */
+ clksel = (cg_in(cg, hwc->reg) & CLKSEL_MASK) >> CLKSEL_SHIFT;
+ div = get_pll_div(cg, hwc, clksel);
+ if (!div) {
+ kfree(hwc);
+ return NULL;
+ }
+
+ return create_mux_common(cg, hwc, &cmux_ops, "cg-cmux%d", idx);
+}
+
+static struct clk * __init create_one_hwaccel(struct clockgen *cg, int idx)
+{
+ struct mux_hwclock *hwc;
+
+ hwc = xzalloc(sizeof(*hwc));
+
+ hwc->reg = cg->regs + 0x20 * idx + 0x10;
+ hwc->info = cg->info.hwaccel[idx];
+
+ return create_mux_common(cg, hwc, &hwaccel_ops, "cg-hwaccel%d", idx);
+}
+
+static void __init create_muxes(struct clockgen *cg)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cg->cmux); i++) {
+ if (cg->info.cmux_to_group[i] < 0)
+ break;
+ if (cg->info.cmux_to_group[i] >=
+ ARRAY_SIZE(cg->info.cmux_groups)) {
+ continue;
+ }
+
+ cg->cmux[i] = create_one_cmux(cg, i);
+ }
+
+ for (i = 0; i < ARRAY_SIZE(cg->hwaccel); i++) {
+ if (!cg->info.hwaccel[i])
+ continue;
+
+ cg->hwaccel[i] = create_one_hwaccel(cg, i);
+ }
+}
+
+#define PLL_KILL BIT(31)
+
+static void __init create_one_pll(struct clockgen *cg, int idx)
+{
+ u32 __iomem *reg;
+ u32 mult;
+ struct clockgen_pll *pll = &cg->pll[idx];
+ const char *input = cg->sysclk->name;
+ int i;
+
+ if (!(cg->info.pll_mask & (1 << idx)))
+ return;
+
+ if (cg->coreclk && idx != PLATFORM_PLL) {
+ if (IS_ERR(cg->coreclk))
+ return;
+
+ input = cg->coreclk->name;
+ }
+
+ if (cg->info.flags & CG_VER3) {
+ switch (idx) {
+ case PLATFORM_PLL:
+ reg = cg->regs + 0x60080;
+ break;
+ case CGA_PLL1:
+ reg = cg->regs + 0x80;
+ break;
+ case CGA_PLL2:
+ reg = cg->regs + 0xa0;
+ break;
+ case CGB_PLL1:
+ reg = cg->regs + 0x10080;
+ break;
+ case CGB_PLL2:
+ reg = cg->regs + 0x100a0;
+ break;
+ default:
+ pr_warn("index %d\n", idx);
+ return;
+ }
+ } else {
+ if (idx == PLATFORM_PLL)
+ reg = cg->regs + 0xc00;
+ else
+ reg = cg->regs + 0x800 + 0x20 * (idx - 1);
+ }
+
+ /* Get the multiple of PLL */
+ mult = cg_in(cg, reg);
+
+ /* Check if this PLL is disabled */
+ if (mult & PLL_KILL) {
+ pr_debug("%s(): pll %p disabled\n", __func__, reg);
+ return;
+ }
+
+ if ((cg->info.flags & CG_VER3) ||
+ ((cg->info.flags & CG_PLL_8BIT) && idx != PLATFORM_PLL))
+ mult = (mult & GENMASK(8, 1)) >> 1;
+ else
+ mult = (mult & GENMASK(6, 1)) >> 1;
+
+ for (i = 0; i < ARRAY_SIZE(pll->div); i++) {
+ struct clk *clk;
+
+ /*
+ * For platform PLL, there are 8 divider clocks.
+ * For core PLL, there are 4 divider clocks at most.
+ */
+ if (idx != PLATFORM_PLL && i >= 4)
+ break;
+
+ snprintf(pll->div[i].name, sizeof(pll->div[i].name),
+ "cg-pll%d-div%d", idx, i + 1);
+
+ clk = clk_fixed_factor(pll->div[i].name, input, mult, i + 1, 0);
+ if (IS_ERR(clk)) {
+ pr_err("%s: %s: register failed %ld\n",
+ __func__, pll->div[i].name, PTR_ERR(clk));
+ continue;
+ }
+
+ pll->div[i].clk = clk;
+ }
+}
+
+static void __init create_plls(struct clockgen *cg)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(cg->pll); i++)
+ create_one_pll(cg, i);
+}
+
+static struct clk *clockgen_clk_get(struct of_phandle_args *clkspec, void *data)
+{
+ struct clockgen *cg = data;
+ struct clk *clk;
+ struct clockgen_pll *pll;
+ u32 type, idx;
+
+ if (clkspec->args_count < 2) {
+ pr_err("%s: insufficient phandle args\n", __func__);
+ return ERR_PTR(-EINVAL);
+ }
+
+ type = clkspec->args[0];
+ idx = clkspec->args[1];
+
+ switch (type) {
+ case 0:
+ if (idx != 0)
+ goto bad_args;
+ clk = cg->sysclk;
+ break;
+ case 1:
+ if (idx >= ARRAY_SIZE(cg->cmux))
+ goto bad_args;
+ clk = cg->cmux[idx];
+ break;
+ case 2:
+ if (idx >= ARRAY_SIZE(cg->hwaccel))
+ goto bad_args;
+ clk = cg->hwaccel[idx];
+ break;
+ case 3:
+ if (idx >= ARRAY_SIZE(cg->fman))
+ goto bad_args;
+ clk = cg->fman[idx];
+ break;
+ case 4:
+ pll = &cg->pll[PLATFORM_PLL];
+ if (idx >= ARRAY_SIZE(pll->div))
+ goto bad_args;
+ clk = pll->div[idx].clk;
+ break;
+ case 5:
+ if (idx != 0)
+ goto bad_args;
+ clk = cg->coreclk;
+ if (IS_ERR(clk))
+ clk = NULL;
+ break;
+ default:
+ goto bad_args;
+ }
+
+ if (!clk)
+ return ERR_PTR(-ENOENT);
+ return clk;
+
+bad_args:
+ pr_err("%s: Bad phandle args %u %u\n", __func__, type, idx);
+ return ERR_PTR(-EINVAL);
+}
+
+static void __init clockgen_init(struct device_node *np,
+ const struct clockgen_chipinfo *chipinfo)
+{
+ int ret;
+
+ clockgen.node = np;
+ clockgen.regs = of_iomap(np, 0);
+ if (!clockgen.regs) {
+ pr_err("of_iomap failed for %s\n", np->full_name);
+ return;
+ }
+
+ clockgen.info = *chipinfo;
+
+ clockgen.sysclk = of_clk_get(clockgen.node, 0);
+ if (IS_ERR(clockgen.sysclk)) {
+ pr_err("sysclk not found: %s\n", strerrorp(clockgen.sysclk));
+ return;
+ }
+
+ clockgen.coreclk = of_clk_get(clockgen.node, 1);
+ if (IS_ERR(clockgen.coreclk))
+ clockgen.coreclk = NULL;
+
+ create_plls(&clockgen);
+ create_muxes(&clockgen);
+
+ if (clockgen.info.init_periph)
+ clockgen.info.init_periph(&clockgen);
+
+ ret = of_clk_add_provider(np, clockgen_clk_get, &clockgen);
+ if (ret) {
+ pr_err("Couldn't register clk provider for node %s: %d\n",
+ np->full_name, ret);
+ }
+
+ return;
+}
+
+static void __maybe_unused clockgen_init_ls1012a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls1012a);
+}
+
+static void __maybe_unused clockgen_init_ls1021a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls1021a);
+}
+
+static void __maybe_unused clockgen_init_ls1043a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls1043a);
+}
+
+static void __maybe_unused clockgen_init_ls1046a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls1046a);
+}
+
+static void __maybe_unused clockgen_init_ls1088a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls1088a);
+}
+
+static void __maybe_unused clockgen_init_ls2080a(struct device_node *np)
+{
+ clockgen_init(np, &chipinfo_ls2080a);
+}
+
+#ifdef CONFIG_ARCH_LS1012
+CLK_OF_DECLARE(qoriq_clockgen_ls1012a, "fsl,ls1012a-clockgen", clockgen_init_ls1012a);
+#endif
+#ifdef CONFIG_ARCH_LS1021
+CLK_OF_DECLARE(qoriq_clockgen_ls1021a, "fsl,ls1021a-clockgen", clockgen_init_ls1021a);
+#endif
+#ifdef CONFIG_ARCH_LS1043
+CLK_OF_DECLARE(qoriq_clockgen_ls1043a, "fsl,ls1043a-clockgen", clockgen_init_ls1043a);
+#endif
+#ifdef CONFIG_ARCH_LS1046
+CLK_OF_DECLARE(qoriq_clockgen_ls1046a, "fsl,ls1046a-clockgen", clockgen_init_ls1046a);
+#endif
+#ifdef CONFIG_ARCH_LS1088
+CLK_OF_DECLARE(qoriq_clockgen_ls1088a, "fsl,ls1088a-clockgen", clockgen_init_ls1088a);
+#endif
+#ifdef CONFIG_ARCH_LS2080
+CLK_OF_DECLARE(qoriq_clockgen_ls2080a, "fsl,ls2080a-clockgen", clockgen_init_ls2080a);
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-16 18:46:25 +0000