diff options
Diffstat (limited to 'drivers/clk/shmobile/clk-sh73a0.c')
| -rw-r--r-- | drivers/clk/shmobile/clk-sh73a0.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/drivers/clk/shmobile/clk-sh73a0.c b/drivers/clk/shmobile/clk-sh73a0.c new file mode 100644 index 00000000000..cd529cfe412 --- /dev/null +++ b/drivers/clk/shmobile/clk-sh73a0.c @@ -0,0 +1,218 @@ +/* + * sh73a0 Core CPG Clocks + * + * Copyright (C) 2014 Ulrich Hecht + * + * 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; version 2 of the License. + */ + +#include <linux/clk-provider.h> +#include <linux/clkdev.h> +#include <linux/clk/shmobile.h> +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/spinlock.h> + +struct sh73a0_cpg { + struct clk_onecell_data data; + spinlock_t lock; + void __iomem *reg; +}; + +#define CPG_FRQCRA 0x00 +#define CPG_FRQCRB 0x04 +#define CPG_SD0CKCR 0x74 +#define CPG_SD1CKCR 0x78 +#define CPG_SD2CKCR 0x7c +#define CPG_PLLECR 0xd0 +#define CPG_PLL0CR 0xd8 +#define CPG_PLL1CR 0x28 +#define CPG_PLL2CR 0x2c +#define CPG_PLL3CR 0xdc +#define CPG_CKSCR 0xc0 +#define CPG_DSI0PHYCR 0x6c +#define CPG_DSI1PHYCR 0x70 + +#define CLK_ENABLE_ON_INIT BIT(0) + +struct div4_clk { + const char *name; + const char *parent; + unsigned int reg; + unsigned int shift; +}; + +static struct div4_clk div4_clks[] = { + { "zg", "pll0", CPG_FRQCRA, 16 }, + { "m3", "pll1", CPG_FRQCRA, 12 }, + { "b", "pll1", CPG_FRQCRA, 8 }, + { "m1", "pll1", CPG_FRQCRA, 4 }, + { "m2", "pll1", CPG_FRQCRA, 0 }, + { "zx", "pll1", CPG_FRQCRB, 12 }, + { "hp", "pll1", CPG_FRQCRB, 4 }, + { NULL, NULL, 0, 0 }, +}; + +static const struct clk_div_table div4_div_table[] = { + { 0, 2 }, { 1, 3 }, { 2, 4 }, { 3, 6 }, { 4, 8 }, { 5, 12 }, + { 6, 16 }, { 7, 18 }, { 8, 24 }, { 10, 36 }, { 11, 48 }, + { 12, 7 }, { 0, 0 } +}; + +static const struct clk_div_table z_div_table[] = { + /* ZSEL == 0 */ + { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 }, { 4, 1 }, { 5, 1 }, + { 6, 1 }, { 7, 1 }, { 8, 1 }, { 9, 1 }, { 10, 1 }, { 11, 1 }, + { 12, 1 }, { 13, 1 }, { 14, 1 }, { 15, 1 }, + /* ZSEL == 1 */ + { 16, 2 }, { 17, 3 }, { 18, 4 }, { 19, 6 }, { 20, 8 }, { 21, 12 }, + { 22, 16 }, { 24, 24 }, { 27, 48 }, { 0, 0 } +}; + +static struct clk * __init +sh73a0_cpg_register_clock(struct device_node *np, struct sh73a0_cpg *cpg, + const char *name) +{ + const struct clk_div_table *table = NULL; + unsigned int shift, reg, width; + const char *parent_name; + unsigned int mult = 1; + unsigned int div = 1; + + if (!strcmp(name, "main")) { + /* extal1, extal1_div2, extal2, extal2_div2 */ + u32 parent_idx = (clk_readl(cpg->reg + CPG_CKSCR) >> 28) & 3; + + parent_name = of_clk_get_parent_name(np, parent_idx >> 1); + div = (parent_idx & 1) + 1; + } else if (!strncmp(name, "pll", 3)) { + void __iomem *enable_reg = cpg->reg; + u32 enable_bit = name[3] - '0'; + + parent_name = "main"; + switch (enable_bit) { + case 0: + enable_reg += CPG_PLL0CR; + break; + case 1: + enable_reg += CPG_PLL1CR; + break; + case 2: + enable_reg += CPG_PLL2CR; + break; + case 3: + enable_reg += CPG_PLL3CR; + break; + default: + return ERR_PTR(-EINVAL); + } + if (clk_readl(cpg->reg + CPG_PLLECR) & BIT(enable_bit)) { + mult = ((clk_readl(enable_reg) >> 24) & 0x3f) + 1; + /* handle CFG bit for PLL1 and PLL2 */ + if (enable_bit == 1 || enable_bit == 2) + if (clk_readl(enable_reg) & BIT(20)) + mult *= 2; + } + } else if (!strcmp(name, "dsi0phy") || !strcmp(name, "dsi1phy")) { + u32 phy_no = name[3] - '0'; + void __iomem *dsi_reg = cpg->reg + + (phy_no ? CPG_DSI1PHYCR : CPG_DSI0PHYCR); + + parent_name = phy_no ? "dsi1pck" : "dsi0pck"; + mult = __raw_readl(dsi_reg); + if (!(mult & 0x8000)) + mult = 1; + else + mult = (mult & 0x3f) + 1; + } else if (!strcmp(name, "z")) { + parent_name = "pll0"; + table = z_div_table; + reg = CPG_FRQCRB; + shift = 24; + width = 5; + } else { + struct div4_clk *c; + + for (c = div4_clks; c->name; c++) { + if (!strcmp(name, c->name)) { + parent_name = c->parent; + table = div4_div_table; + reg = c->reg; + shift = c->shift; + width = 4; + break; + } + } + if (!c->name) + return ERR_PTR(-EINVAL); + } + + if (!table) { + return clk_register_fixed_factor(NULL, name, parent_name, 0, + mult, div); + } else { + return clk_register_divider_table(NULL, name, parent_name, 0, + cpg->reg + reg, shift, width, 0, + table, &cpg->lock); + } +} + +static void __init sh73a0_cpg_clocks_init(struct device_node *np) +{ + struct sh73a0_cpg *cpg; + struct clk **clks; + unsigned int i; + int num_clks; + + num_clks = of_property_count_strings(np, "clock-output-names"); + if (num_clks < 0) { + pr_err("%s: failed to count clocks\n", __func__); + return; + } + + cpg = kzalloc(sizeof(*cpg), GFP_KERNEL); + clks = kcalloc(num_clks, sizeof(*clks), GFP_KERNEL); + if (cpg == NULL || clks == NULL) { + /* We're leaking memory on purpose, there's no point in cleaning + * up as the system won't boot anyway. + */ + return; + } + + spin_lock_init(&cpg->lock); + + cpg->data.clks = clks; + cpg->data.clk_num = num_clks; + + cpg->reg = of_iomap(np, 0); + if (WARN_ON(cpg->reg == NULL)) + return; + + /* Set SDHI clocks to a known state */ + clk_writel(0x108, cpg->reg + CPG_SD0CKCR); + clk_writel(0x108, cpg->reg + CPG_SD1CKCR); + clk_writel(0x108, cpg->reg + CPG_SD2CKCR); + + for (i = 0; i < num_clks; ++i) { + const char *name; + struct clk *clk; + + of_property_read_string_index(np, "clock-output-names", i, + &name); + + clk = sh73a0_cpg_register_clock(np, cpg, name); + if (IS_ERR(clk)) + pr_err("%s: failed to register %s %s clock (%ld)\n", + __func__, np->name, name, PTR_ERR(clk)); + else + cpg->data.clks[i] = clk; + } + + of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data); +} +CLK_OF_DECLARE(sh73a0_cpg_clks, "renesas,sh73a0-cpg-clocks", + sh73a0_cpg_clocks_init); |