diff options
Diffstat (limited to 'drivers/clk/clk-milbeaut.c')
| -rw-r--r-- | drivers/clk/clk-milbeaut.c | 663 |
1 files changed, 663 insertions, 0 deletions
diff --git a/drivers/clk/clk-milbeaut.c b/drivers/clk/clk-milbeaut.c new file mode 100644 index 000000000..80b9d7849 --- /dev/null +++ b/drivers/clk/clk-milbeaut.c @@ -0,0 +1,663 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2018 Socionext Inc. + * Copyright (C) 2016 Linaro Ltd. + */ + +#include <linux/clk-provider.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#define M10V_CLKSEL1 0x0 +#define CLKSEL(n) (((n) - 1) * 4 + M10V_CLKSEL1) + +#define M10V_PLL1 "pll1" +#define M10V_PLL1DIV2 "pll1-2" +#define M10V_PLL2 "pll2" +#define M10V_PLL2DIV2 "pll2-2" +#define M10V_PLL6 "pll6" +#define M10V_PLL6DIV2 "pll6-2" +#define M10V_PLL6DIV3 "pll6-3" +#define M10V_PLL7 "pll7" +#define M10V_PLL7DIV2 "pll7-2" +#define M10V_PLL7DIV5 "pll7-5" +#define M10V_PLL9 "pll9" +#define M10V_PLL10 "pll10" +#define M10V_PLL10DIV2 "pll10-2" +#define M10V_PLL11 "pll11" + +#define M10V_SPI_PARENT0 "spi-parent0" +#define M10V_SPI_PARENT1 "spi-parent1" +#define M10V_SPI_PARENT2 "spi-parent2" +#define M10V_UHS1CLK2_PARENT0 "uhs1clk2-parent0" +#define M10V_UHS1CLK2_PARENT1 "uhs1clk2-parent1" +#define M10V_UHS1CLK2_PARENT2 "uhs1clk2-parent2" +#define M10V_UHS1CLK1_PARENT0 "uhs1clk1-parent0" +#define M10V_UHS1CLK1_PARENT1 "uhs1clk1-parent1" +#define M10V_NFCLK_PARENT0 "nfclk-parent0" +#define M10V_NFCLK_PARENT1 "nfclk-parent1" +#define M10V_NFCLK_PARENT2 "nfclk-parent2" +#define M10V_NFCLK_PARENT3 "nfclk-parent3" +#define M10V_NFCLK_PARENT4 "nfclk-parent4" +#define M10V_NFCLK_PARENT5 "nfclk-parent5" + +#define M10V_DCHREQ 1 +#define M10V_UPOLL_RATE 1 +#define M10V_UTIMEOUT 250 + +#define M10V_EMMCCLK_ID 0 +#define M10V_ACLK_ID 1 +#define M10V_HCLK_ID 2 +#define M10V_PCLK_ID 3 +#define M10V_RCLK_ID 4 +#define M10V_SPICLK_ID 5 +#define M10V_NFCLK_ID 6 +#define M10V_UHS1CLK2_ID 7 +#define M10V_NUM_CLKS 8 + +#define to_m10v_div(_hw) container_of(_hw, struct m10v_clk_divider, hw) + +static struct clk_hw_onecell_data *m10v_clk_data; + +static DEFINE_SPINLOCK(m10v_crglock); + +struct m10v_clk_div_factors { + const char *name; + const char *parent_name; + u32 offset; + u8 shift; + u8 width; + const struct clk_div_table *table; + unsigned long div_flags; + int onecell_idx; +}; + +struct m10v_clk_div_fixed_data { + const char *name; + const char *parent_name; + u8 div; + u8 mult; + int onecell_idx; +}; + +struct m10v_clk_mux_factors { + const char *name; + const char * const *parent_names; + u8 num_parents; + u32 offset; + u8 shift; + u8 mask; + u32 *table; + unsigned long mux_flags; + int onecell_idx; +}; + +static const struct clk_div_table emmcclk_table[] = { + { .val = 0, .div = 8 }, + { .val = 1, .div = 9 }, + { .val = 2, .div = 10 }, + { .val = 3, .div = 15 }, + { .div = 0 }, +}; + +static const struct clk_div_table mclk400_table[] = { + { .val = 1, .div = 2 }, + { .val = 3, .div = 4 }, + { .div = 0 }, +}; + +static const struct clk_div_table mclk200_table[] = { + { .val = 3, .div = 4 }, + { .val = 7, .div = 8 }, + { .div = 0 }, +}; + +static const struct clk_div_table aclk400_table[] = { + { .val = 1, .div = 2 }, + { .val = 3, .div = 4 }, + { .div = 0 }, +}; + +static const struct clk_div_table aclk300_table[] = { + { .val = 0, .div = 2 }, + { .val = 1, .div = 3 }, + { .div = 0 }, +}; + +static const struct clk_div_table aclk_table[] = { + { .val = 3, .div = 4 }, + { .val = 7, .div = 8 }, + { .div = 0 }, +}; + +static const struct clk_div_table aclkexs_table[] = { + { .val = 3, .div = 4 }, + { .val = 4, .div = 5 }, + { .val = 5, .div = 6 }, + { .val = 7, .div = 8 }, + { .div = 0 }, +}; + +static const struct clk_div_table hclk_table[] = { + { .val = 7, .div = 8 }, + { .val = 15, .div = 16 }, + { .div = 0 }, +}; + +static const struct clk_div_table hclkbmh_table[] = { + { .val = 3, .div = 4 }, + { .val = 7, .div = 8 }, + { .div = 0 }, +}; + +static const struct clk_div_table pclk_table[] = { + { .val = 15, .div = 16 }, + { .val = 31, .div = 32 }, + { .div = 0 }, +}; + +static const struct clk_div_table rclk_table[] = { + { .val = 0, .div = 8 }, + { .val = 1, .div = 16 }, + { .val = 2, .div = 24 }, + { .val = 3, .div = 32 }, + { .div = 0 }, +}; + +static const struct clk_div_table uhs1clk0_table[] = { + { .val = 0, .div = 2 }, + { .val = 1, .div = 3 }, + { .val = 2, .div = 4 }, + { .val = 3, .div = 8 }, + { .val = 4, .div = 16 }, + { .div = 0 }, +}; + +static const struct clk_div_table uhs2clk_table[] = { + { .val = 0, .div = 9 }, + { .val = 1, .div = 10 }, + { .val = 2, .div = 11 }, + { .val = 3, .div = 12 }, + { .val = 4, .div = 13 }, + { .val = 5, .div = 14 }, + { .val = 6, .div = 16 }, + { .val = 7, .div = 18 }, + { .div = 0 }, +}; + +static u32 spi_mux_table[] = {0, 1, 2}; +static const char * const spi_mux_names[] = { + M10V_SPI_PARENT0, M10V_SPI_PARENT1, M10V_SPI_PARENT2 +}; + +static u32 uhs1clk2_mux_table[] = {2, 3, 4, 8}; +static const char * const uhs1clk2_mux_names[] = { + M10V_UHS1CLK2_PARENT0, M10V_UHS1CLK2_PARENT1, + M10V_UHS1CLK2_PARENT2, M10V_PLL6DIV2 +}; + +static u32 uhs1clk1_mux_table[] = {3, 4, 8}; +static const char * const uhs1clk1_mux_names[] = { + M10V_UHS1CLK1_PARENT0, M10V_UHS1CLK1_PARENT1, M10V_PLL6DIV2 +}; + +static u32 nfclk_mux_table[] = {0, 1, 2, 3, 4, 8}; +static const char * const nfclk_mux_names[] = { + M10V_NFCLK_PARENT0, M10V_NFCLK_PARENT1, M10V_NFCLK_PARENT2, + M10V_NFCLK_PARENT3, M10V_NFCLK_PARENT4, M10V_NFCLK_PARENT5 +}; + +static const struct m10v_clk_div_fixed_data m10v_pll_fixed_data[] = { + {M10V_PLL1, NULL, 1, 40, -1}, + {M10V_PLL2, NULL, 1, 30, -1}, + {M10V_PLL6, NULL, 1, 35, -1}, + {M10V_PLL7, NULL, 1, 40, -1}, + {M10V_PLL9, NULL, 1, 33, -1}, + {M10V_PLL10, NULL, 5, 108, -1}, + {M10V_PLL10DIV2, M10V_PLL10, 2, 1, -1}, + {M10V_PLL11, NULL, 2, 75, -1}, +}; + +static const struct m10v_clk_div_fixed_data m10v_div_fixed_data[] = { + {"usb2", NULL, 2, 1, -1}, + {"pcisuppclk", NULL, 20, 1, -1}, + {M10V_PLL1DIV2, M10V_PLL1, 2, 1, -1}, + {M10V_PLL2DIV2, M10V_PLL2, 2, 1, -1}, + {M10V_PLL6DIV2, M10V_PLL6, 2, 1, -1}, + {M10V_PLL6DIV3, M10V_PLL6, 3, 1, -1}, + {M10V_PLL7DIV2, M10V_PLL7, 2, 1, -1}, + {M10V_PLL7DIV5, M10V_PLL7, 5, 1, -1}, + {"ca7wd", M10V_PLL2DIV2, 12, 1, -1}, + {"pclkca7wd", M10V_PLL1DIV2, 16, 1, -1}, + {M10V_SPI_PARENT0, M10V_PLL10DIV2, 2, 1, -1}, + {M10V_SPI_PARENT1, M10V_PLL10DIV2, 4, 1, -1}, + {M10V_SPI_PARENT2, M10V_PLL7DIV2, 8, 1, -1}, + {M10V_UHS1CLK2_PARENT0, M10V_PLL7, 4, 1, -1}, + {M10V_UHS1CLK2_PARENT1, M10V_PLL7, 8, 1, -1}, + {M10V_UHS1CLK2_PARENT2, M10V_PLL7, 16, 1, -1}, + {M10V_UHS1CLK1_PARENT0, M10V_PLL7, 8, 1, -1}, + {M10V_UHS1CLK1_PARENT1, M10V_PLL7, 16, 1, -1}, + {M10V_NFCLK_PARENT0, M10V_PLL7DIV2, 8, 1, -1}, + {M10V_NFCLK_PARENT1, M10V_PLL7DIV2, 10, 1, -1}, + {M10V_NFCLK_PARENT2, M10V_PLL7DIV2, 13, 1, -1}, + {M10V_NFCLK_PARENT3, M10V_PLL7DIV2, 16, 1, -1}, + {M10V_NFCLK_PARENT4, M10V_PLL7DIV2, 40, 1, -1}, + {M10V_NFCLK_PARENT5, M10V_PLL7DIV5, 10, 1, -1}, +}; + +static const struct m10v_clk_div_factors m10v_div_factor_data[] = { + {"emmc", M10V_PLL11, CLKSEL(1), 28, 3, emmcclk_table, 0, + M10V_EMMCCLK_ID}, + {"mclk400", M10V_PLL1DIV2, CLKSEL(10), 7, 3, mclk400_table, 0, -1}, + {"mclk200", M10V_PLL1DIV2, CLKSEL(10), 3, 4, mclk200_table, 0, -1}, + {"aclk400", M10V_PLL1DIV2, CLKSEL(10), 0, 3, aclk400_table, 0, -1}, + {"aclk300", M10V_PLL2DIV2, CLKSEL(12), 0, 2, aclk300_table, 0, -1}, + {"aclk", M10V_PLL1DIV2, CLKSEL(9), 20, 4, aclk_table, 0, M10V_ACLK_ID}, + {"aclkexs", M10V_PLL1DIV2, CLKSEL(9), 16, 4, aclkexs_table, 0, -1}, + {"hclk", M10V_PLL1DIV2, CLKSEL(9), 7, 5, hclk_table, 0, M10V_HCLK_ID}, + {"hclkbmh", M10V_PLL1DIV2, CLKSEL(9), 12, 4, hclkbmh_table, 0, -1}, + {"pclk", M10V_PLL1DIV2, CLKSEL(9), 0, 7, pclk_table, 0, M10V_PCLK_ID}, + {"uhs1clk0", M10V_PLL7, CLKSEL(1), 3, 5, uhs1clk0_table, 0, -1}, + {"uhs2clk", M10V_PLL6DIV3, CLKSEL(1), 18, 4, uhs2clk_table, 0, -1}, +}; + +static const struct m10v_clk_mux_factors m10v_mux_factor_data[] = { + {"spi", spi_mux_names, ARRAY_SIZE(spi_mux_names), + CLKSEL(8), 3, 7, spi_mux_table, 0, M10V_SPICLK_ID}, + {"uhs1clk2", uhs1clk2_mux_names, ARRAY_SIZE(uhs1clk2_mux_names), + CLKSEL(1), 13, 31, uhs1clk2_mux_table, 0, M10V_UHS1CLK2_ID}, + {"uhs1clk1", uhs1clk1_mux_names, ARRAY_SIZE(uhs1clk1_mux_names), + CLKSEL(1), 8, 31, uhs1clk1_mux_table, 0, -1}, + {"nfclk", nfclk_mux_names, ARRAY_SIZE(nfclk_mux_names), + CLKSEL(1), 22, 127, nfclk_mux_table, 0, M10V_NFCLK_ID}, +}; + +static u8 m10v_mux_get_parent(struct clk_hw *hw) +{ + struct clk_mux *mux = to_clk_mux(hw); + u32 val; + + val = readl(mux->reg) >> mux->shift; + val &= mux->mask; + + return clk_mux_val_to_index(hw, mux->table, mux->flags, val); +} + +static int m10v_mux_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_mux *mux = to_clk_mux(hw); + u32 val = clk_mux_index_to_val(mux->table, mux->flags, index); + unsigned long flags = 0; + u32 reg; + u32 write_en = BIT(fls(mux->mask) - 1); + + if (mux->lock) + spin_lock_irqsave(mux->lock, flags); + else + __acquire(mux->lock); + + reg = readl(mux->reg); + reg &= ~(mux->mask << mux->shift); + + val = (val | write_en) << mux->shift; + reg |= val; + writel(reg, mux->reg); + + if (mux->lock) + spin_unlock_irqrestore(mux->lock, flags); + else + __release(mux->lock); + + return 0; +} + +static const struct clk_ops m10v_mux_ops = { + .get_parent = m10v_mux_get_parent, + .set_parent = m10v_mux_set_parent, + .determine_rate = __clk_mux_determine_rate, +}; + +static struct clk_hw *m10v_clk_hw_register_mux(struct device *dev, + const char *name, const char * const *parent_names, + u8 num_parents, unsigned long flags, void __iomem *reg, + u8 shift, u32 mask, u8 clk_mux_flags, u32 *table, + spinlock_t *lock) +{ + struct clk_mux *mux; + struct clk_hw *hw; + struct clk_init_data init; + int ret; + + mux = kzalloc(sizeof(*mux), GFP_KERNEL); + if (!mux) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &m10v_mux_ops; + init.flags = flags; + init.parent_names = parent_names; + init.num_parents = num_parents; + + mux->reg = reg; + mux->shift = shift; + mux->mask = mask; + mux->flags = clk_mux_flags; + mux->lock = lock; + mux->table = table; + mux->hw.init = &init; + + hw = &mux->hw; + ret = clk_hw_register(dev, hw); + if (ret) { + kfree(mux); + hw = ERR_PTR(ret); + } + + return hw; + +} + +struct m10v_clk_divider { + struct clk_hw hw; + void __iomem *reg; + u8 shift; + u8 width; + u8 flags; + const struct clk_div_table *table; + spinlock_t *lock; + void __iomem *write_valid_reg; +}; + +static unsigned long m10v_clk_divider_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct m10v_clk_divider *divider = to_m10v_div(hw); + unsigned int val; + + val = readl(divider->reg) >> divider->shift; + val &= clk_div_mask(divider->width); + + return divider_recalc_rate(hw, parent_rate, val, divider->table, + divider->flags, divider->width); +} + +static long m10v_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct m10v_clk_divider *divider = to_m10v_div(hw); + + /* if read only, just return current value */ + if (divider->flags & CLK_DIVIDER_READ_ONLY) { + u32 val; + + val = readl(divider->reg) >> divider->shift; + val &= clk_div_mask(divider->width); + + return divider_ro_round_rate(hw, rate, prate, divider->table, + divider->width, divider->flags, + val); + } + + return divider_round_rate(hw, rate, prate, divider->table, + divider->width, divider->flags); +} + +static int m10v_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct m10v_clk_divider *divider = to_m10v_div(hw); + int value; + unsigned long flags = 0; + u32 val; + u32 write_en = BIT(divider->width - 1); + + value = divider_get_val(rate, parent_rate, divider->table, + divider->width, divider->flags); + if (value < 0) + return value; + + if (divider->lock) + spin_lock_irqsave(divider->lock, flags); + else + __acquire(divider->lock); + + val = readl(divider->reg); + val &= ~(clk_div_mask(divider->width) << divider->shift); + + val |= ((u32)value | write_en) << divider->shift; + writel(val, divider->reg); + + if (divider->write_valid_reg) { + writel(M10V_DCHREQ, divider->write_valid_reg); + if (readl_poll_timeout(divider->write_valid_reg, val, + !val, M10V_UPOLL_RATE, M10V_UTIMEOUT)) + pr_err("%s:%s couldn't stabilize\n", + __func__, clk_hw_get_name(hw)); + } + + if (divider->lock) + spin_unlock_irqrestore(divider->lock, flags); + else + __release(divider->lock); + + return 0; +} + +static const struct clk_ops m10v_clk_divider_ops = { + .recalc_rate = m10v_clk_divider_recalc_rate, + .round_rate = m10v_clk_divider_round_rate, + .set_rate = m10v_clk_divider_set_rate, +}; + +static struct clk_hw *m10v_clk_hw_register_divider(struct device *dev, + const char *name, const char *parent_name, unsigned long flags, + void __iomem *reg, u8 shift, u8 width, + u8 clk_divider_flags, const struct clk_div_table *table, + spinlock_t *lock, void __iomem *write_valid_reg) +{ + struct m10v_clk_divider *div; + struct clk_hw *hw; + struct clk_init_data init; + int ret; + + div = kzalloc(sizeof(*div), GFP_KERNEL); + if (!div) + return ERR_PTR(-ENOMEM); + + init.name = name; + init.ops = &m10v_clk_divider_ops; + init.flags = flags; + init.parent_names = &parent_name; + init.num_parents = 1; + + div->reg = reg; + div->shift = shift; + div->width = width; + div->flags = clk_divider_flags; + div->lock = lock; + div->hw.init = &init; + div->table = table; + div->write_valid_reg = write_valid_reg; + + /* register the clock */ + hw = &div->hw; + ret = clk_hw_register(dev, hw); + if (ret) { + kfree(div); + hw = ERR_PTR(ret); + } + + return hw; +} + +static void m10v_reg_div_pre(const struct m10v_clk_div_factors *factors, + struct clk_hw_onecell_data *clk_data, + void __iomem *base) +{ + struct clk_hw *hw; + void __iomem *write_valid_reg; + + /* + * The registers on CLKSEL(9) or CLKSEL(10) need additional + * writing to become valid. + */ + if ((factors->offset == CLKSEL(9)) || (factors->offset == CLKSEL(10))) + write_valid_reg = base + CLKSEL(11); + else + write_valid_reg = NULL; + + hw = m10v_clk_hw_register_divider(NULL, factors->name, + factors->parent_name, + CLK_SET_RATE_PARENT, + base + factors->offset, + factors->shift, + factors->width, factors->div_flags, + factors->table, + &m10v_crglock, write_valid_reg); + + if (factors->onecell_idx >= 0) + clk_data->hws[factors->onecell_idx] = hw; +} + +static void m10v_reg_fixed_pre(const struct m10v_clk_div_fixed_data *factors, + struct clk_hw_onecell_data *clk_data, + const char *parent_name) +{ + struct clk_hw *hw; + const char *pn = factors->parent_name ? + factors->parent_name : parent_name; + + hw = clk_hw_register_fixed_factor(NULL, factors->name, pn, 0, + factors->mult, factors->div); + + if (factors->onecell_idx >= 0) + clk_data->hws[factors->onecell_idx] = hw; +} + +static void m10v_reg_mux_pre(const struct m10v_clk_mux_factors *factors, + struct clk_hw_onecell_data *clk_data, + void __iomem *base) +{ + struct clk_hw *hw; + + hw = m10v_clk_hw_register_mux(NULL, factors->name, + factors->parent_names, + factors->num_parents, + CLK_SET_RATE_PARENT, + base + factors->offset, factors->shift, + factors->mask, factors->mux_flags, + factors->table, &m10v_crglock); + + if (factors->onecell_idx >= 0) + clk_data->hws[factors->onecell_idx] = hw; +} + +static int m10v_clk_probe(struct platform_device *pdev) +{ + int id; + struct resource *res; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + void __iomem *base; + const char *parent_name; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + parent_name = of_clk_get_parent_name(np, 0); + + for (id = 0; id < ARRAY_SIZE(m10v_div_factor_data); ++id) + m10v_reg_div_pre(&m10v_div_factor_data[id], + m10v_clk_data, base); + + for (id = 0; id < ARRAY_SIZE(m10v_div_fixed_data); ++id) + m10v_reg_fixed_pre(&m10v_div_fixed_data[id], + m10v_clk_data, parent_name); + + for (id = 0; id < ARRAY_SIZE(m10v_mux_factor_data); ++id) + m10v_reg_mux_pre(&m10v_mux_factor_data[id], + m10v_clk_data, base); + + for (id = 0; id < M10V_NUM_CLKS; id++) { + if (IS_ERR(m10v_clk_data->hws[id])) + return PTR_ERR(m10v_clk_data->hws[id]); + } + + return 0; +} + +static const struct of_device_id m10v_clk_dt_ids[] = { + { .compatible = "socionext,milbeaut-m10v-ccu", }, + { } +}; + +static struct platform_driver m10v_clk_driver = { + .probe = m10v_clk_probe, + .driver = { + .name = "m10v-ccu", + .of_match_table = m10v_clk_dt_ids, + }, +}; +builtin_platform_driver(m10v_clk_driver); + +static void __init m10v_cc_init(struct device_node *np) +{ + int id; + void __iomem *base; + const char *parent_name; + struct clk_hw *hw; + + m10v_clk_data = kzalloc(struct_size(m10v_clk_data, hws, + M10V_NUM_CLKS), + GFP_KERNEL); + + if (!m10v_clk_data) + return; + + base = of_iomap(np, 0); + if (!base) { + kfree(m10v_clk_data); + return; + } + + parent_name = of_clk_get_parent_name(np, 0); + if (!parent_name) { + kfree(m10v_clk_data); + iounmap(base); + return; + } + + /* + * This way all clocks fetched before the platform device probes, + * except those we assign here for early use, will be deferred. + */ + for (id = 0; id < M10V_NUM_CLKS; id++) + m10v_clk_data->hws[id] = ERR_PTR(-EPROBE_DEFER); + + /* + * PLLs are set by bootloader so this driver registers them as the + * fixed factor. + */ + for (id = 0; id < ARRAY_SIZE(m10v_pll_fixed_data); ++id) + m10v_reg_fixed_pre(&m10v_pll_fixed_data[id], + m10v_clk_data, parent_name); + + /* + * timer consumes "rclk" so it needs to register here. + */ + hw = m10v_clk_hw_register_divider(NULL, "rclk", M10V_PLL10DIV2, 0, + base + CLKSEL(1), 0, 3, 0, rclk_table, + &m10v_crglock, NULL); + m10v_clk_data->hws[M10V_RCLK_ID] = hw; + + m10v_clk_data->num = M10V_NUM_CLKS; + of_clk_add_hw_provider(np, of_clk_hw_onecell_get, m10v_clk_data); +} +CLK_OF_DECLARE_DRIVER(m10v_cc, "socionext,milbeaut-m10v-ccu", m10v_cc_init); |