diff options
Diffstat (limited to 'drivers/clk/clk-cdce706.c')
| -rw-r--r-- | drivers/clk/clk-cdce706.c | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/drivers/clk/clk-cdce706.c b/drivers/clk/clk-cdce706.c new file mode 100644 index 00000000000..c386ad25beb --- /dev/null +++ b/drivers/clk/clk-cdce706.c @@ -0,0 +1,700 @@ +/* + * TI CDCE706 programmable 3-PLL clock synthesizer driver + * + * Copyright (c) 2014 Cadence Design Systems Inc. + * + * Reference: http://www.ti.com/lit/ds/symlink/cdce706.pdf + * + * 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. + */ + +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/rational.h> +#include <linux/regmap.h> +#include <linux/slab.h> + +#define CDCE706_CLKIN_CLOCK 10 +#define CDCE706_CLKIN_SOURCE 11 +#define CDCE706_PLL_M_LOW(pll) (1 + 3 * (pll)) +#define CDCE706_PLL_N_LOW(pll) (2 + 3 * (pll)) +#define CDCE706_PLL_HI(pll) (3 + 3 * (pll)) +#define CDCE706_PLL_MUX 3 +#define CDCE706_PLL_FVCO 6 +#define CDCE706_DIVIDER(div) (13 + (div)) +#define CDCE706_CLKOUT(out) (19 + (out)) + +#define CDCE706_CLKIN_CLOCK_MASK 0x10 +#define CDCE706_CLKIN_SOURCE_SHIFT 6 +#define CDCE706_CLKIN_SOURCE_MASK 0xc0 +#define CDCE706_CLKIN_SOURCE_LVCMOS 0x40 + +#define CDCE706_PLL_MUX_MASK(pll) (0x80 >> (pll)) +#define CDCE706_PLL_LOW_M_MASK 0xff +#define CDCE706_PLL_LOW_N_MASK 0xff +#define CDCE706_PLL_HI_M_MASK 0x1 +#define CDCE706_PLL_HI_N_MASK 0x1e +#define CDCE706_PLL_HI_N_SHIFT 1 +#define CDCE706_PLL_M_MAX 0x1ff +#define CDCE706_PLL_N_MAX 0xfff +#define CDCE706_PLL_FVCO_MASK(pll) (0x80 >> (pll)) +#define CDCE706_PLL_FREQ_MIN 80000000 +#define CDCE706_PLL_FREQ_MAX 300000000 +#define CDCE706_PLL_FREQ_HI 180000000 + +#define CDCE706_DIVIDER_PLL(div) (9 + (div) - ((div) > 2) - ((div) > 4)) +#define CDCE706_DIVIDER_PLL_SHIFT(div) ((div) < 2 ? 5 : 3 * ((div) & 1)) +#define CDCE706_DIVIDER_PLL_MASK(div) (0x7 << CDCE706_DIVIDER_PLL_SHIFT(div)) +#define CDCE706_DIVIDER_DIVIDER_MASK 0x7f +#define CDCE706_DIVIDER_DIVIDER_MAX 0x7f + +#define CDCE706_CLKOUT_DIVIDER_MASK 0x7 +#define CDCE706_CLKOUT_ENABLE_MASK 0x8 + +static struct regmap_config cdce706_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .val_format_endian = REGMAP_ENDIAN_NATIVE, +}; + +#define to_hw_data(phw) (container_of((phw), struct cdce706_hw_data, hw)) + +struct cdce706_hw_data { + struct cdce706_dev_data *dev_data; + unsigned idx; + unsigned parent; + struct clk *clk; + struct clk_hw hw; + unsigned div; + unsigned mul; + unsigned mux; +}; + +struct cdce706_dev_data { + struct i2c_client *client; + struct regmap *regmap; + struct clk_onecell_data onecell; + struct clk *clks[6]; + struct clk *clkin_clk[2]; + const char *clkin_name[2]; + struct cdce706_hw_data clkin[1]; + struct cdce706_hw_data pll[3]; + struct cdce706_hw_data divider[6]; + struct cdce706_hw_data clkout[6]; +}; + +static const char * const cdce706_source_name[] = { + "clk_in0", "clk_in1", +}; + +static const char *cdce706_clkin_name[] = { + "clk_in", +}; + +static const char * const cdce706_pll_name[] = { + "pll1", "pll2", "pll3", +}; + +static const char *cdce706_divider_parent_name[] = { + "clk_in", "pll1", "pll2", "pll2", "pll3", +}; + +static const char *cdce706_divider_name[] = { + "p0", "p1", "p2", "p3", "p4", "p5", +}; + +static const char * const cdce706_clkout_name[] = { + "clk_out0", "clk_out1", "clk_out2", "clk_out3", "clk_out4", "clk_out5", +}; + +static int cdce706_reg_read(struct cdce706_dev_data *dev_data, unsigned reg, + unsigned *val) +{ + int rc = regmap_read(dev_data->regmap, reg | 0x80, val); + + if (rc < 0) + dev_err(&dev_data->client->dev, "error reading reg %u", reg); + return rc; +} + +static int cdce706_reg_write(struct cdce706_dev_data *dev_data, unsigned reg, + unsigned val) +{ + int rc = regmap_write(dev_data->regmap, reg | 0x80, val); + + if (rc < 0) + dev_err(&dev_data->client->dev, "error writing reg %u", reg); + return rc; +} + +static int cdce706_reg_update(struct cdce706_dev_data *dev_data, unsigned reg, + unsigned mask, unsigned val) +{ + int rc = regmap_update_bits(dev_data->regmap, reg | 0x80, mask, val); + + if (rc < 0) + dev_err(&dev_data->client->dev, "error updating reg %u", reg); + return rc; +} + +static int cdce706_clkin_set_parent(struct clk_hw *hw, u8 index) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + hwd->parent = index; + return 0; +} + +static u8 cdce706_clkin_get_parent(struct clk_hw *hw) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + return hwd->parent; +} + +static const struct clk_ops cdce706_clkin_ops = { + .set_parent = cdce706_clkin_set_parent, + .get_parent = cdce706_clkin_get_parent, +}; + +static unsigned long cdce706_pll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + dev_dbg(&hwd->dev_data->client->dev, + "%s, pll: %d, mux: %d, mul: %u, div: %u\n", + __func__, hwd->idx, hwd->mux, hwd->mul, hwd->div); + + if (!hwd->mux) { + if (hwd->div && hwd->mul) { + u64 res = (u64)parent_rate * hwd->mul; + + do_div(res, hwd->div); + return res; + } + } else { + if (hwd->div) + return parent_rate / hwd->div; + } + return 0; +} + +static long cdce706_pll_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + unsigned long mul, div; + u64 res; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, rate: %lu, parent_rate: %lu\n", + __func__, rate, *parent_rate); + + rational_best_approximation(rate, *parent_rate, + CDCE706_PLL_N_MAX, CDCE706_PLL_M_MAX, + &mul, &div); + hwd->mul = mul; + hwd->div = div; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, pll: %d, mul: %lu, div: %lu\n", + __func__, hwd->idx, mul, div); + + res = (u64)*parent_rate * hwd->mul; + do_div(res, hwd->div); + return res; +} + +static int cdce706_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + unsigned long mul = hwd->mul, div = hwd->div; + int err; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, pll: %d, mul: %lu, div: %lu\n", + __func__, hwd->idx, mul, div); + + err = cdce706_reg_update(hwd->dev_data, + CDCE706_PLL_HI(hwd->idx), + CDCE706_PLL_HI_M_MASK | CDCE706_PLL_HI_N_MASK, + ((div >> 8) & CDCE706_PLL_HI_M_MASK) | + ((mul >> (8 - CDCE706_PLL_HI_N_SHIFT)) & + CDCE706_PLL_HI_N_MASK)); + if (err < 0) + return err; + + err = cdce706_reg_write(hwd->dev_data, + CDCE706_PLL_M_LOW(hwd->idx), + div & CDCE706_PLL_LOW_M_MASK); + if (err < 0) + return err; + + err = cdce706_reg_write(hwd->dev_data, + CDCE706_PLL_N_LOW(hwd->idx), + mul & CDCE706_PLL_LOW_N_MASK); + if (err < 0) + return err; + + err = cdce706_reg_update(hwd->dev_data, + CDCE706_PLL_FVCO, + CDCE706_PLL_FVCO_MASK(hwd->idx), + rate > CDCE706_PLL_FREQ_HI ? + CDCE706_PLL_FVCO_MASK(hwd->idx) : 0); + return err; +} + +static const struct clk_ops cdce706_pll_ops = { + .recalc_rate = cdce706_pll_recalc_rate, + .round_rate = cdce706_pll_round_rate, + .set_rate = cdce706_pll_set_rate, +}; + +static int cdce706_divider_set_parent(struct clk_hw *hw, u8 index) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + if (hwd->parent == index) + return 0; + hwd->parent = index; + return cdce706_reg_update(hwd->dev_data, + CDCE706_DIVIDER_PLL(hwd->idx), + CDCE706_DIVIDER_PLL_MASK(hwd->idx), + index << CDCE706_DIVIDER_PLL_SHIFT(hwd->idx)); +} + +static u8 cdce706_divider_get_parent(struct clk_hw *hw) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + return hwd->parent; +} + +static unsigned long cdce706_divider_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + dev_dbg(&hwd->dev_data->client->dev, + "%s, divider: %d, div: %u\n", + __func__, hwd->idx, hwd->div); + if (hwd->div) + return parent_rate / hwd->div; + return 0; +} + +static long cdce706_divider_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + struct cdce706_dev_data *cdce = hwd->dev_data; + unsigned long mul, div; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, rate: %lu, parent_rate: %lu\n", + __func__, rate, *parent_rate); + + rational_best_approximation(rate, *parent_rate, + 1, CDCE706_DIVIDER_DIVIDER_MAX, + &mul, &div); + if (!mul) + div = CDCE706_DIVIDER_DIVIDER_MAX; + + if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) { + unsigned long best_diff = rate; + unsigned long best_div = 0; + struct clk *gp_clk = cdce->clkin_clk[cdce->clkin[0].parent]; + unsigned long gp_rate = gp_clk ? clk_get_rate(gp_clk) : 0; + + for (div = CDCE706_PLL_FREQ_MIN / rate; best_diff && + div <= CDCE706_PLL_FREQ_MAX / rate; ++div) { + unsigned long n, m; + unsigned long diff; + unsigned long div_rate; + u64 div_rate64; + + if (rate * div < CDCE706_PLL_FREQ_MIN) + continue; + + rational_best_approximation(rate * div, gp_rate, + CDCE706_PLL_N_MAX, + CDCE706_PLL_M_MAX, + &n, &m); + div_rate64 = (u64)gp_rate * n; + do_div(div_rate64, m); + do_div(div_rate64, div); + div_rate = div_rate64; + diff = max(div_rate, rate) - min(div_rate, rate); + + if (diff < best_diff) { + best_diff = diff; + best_div = div; + dev_dbg(&hwd->dev_data->client->dev, + "%s, %lu * %lu / %lu / %lu = %lu\n", + __func__, gp_rate, n, m, div, div_rate); + } + } + + div = best_div; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, altering parent rate: %lu -> %lu\n", + __func__, *parent_rate, rate * div); + *parent_rate = rate * div; + } + hwd->div = div; + + dev_dbg(&hwd->dev_data->client->dev, + "%s, divider: %d, div: %lu\n", + __func__, hwd->idx, div); + + return *parent_rate / div; +} + +static int cdce706_divider_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + dev_dbg(&hwd->dev_data->client->dev, + "%s, divider: %d, div: %u\n", + __func__, hwd->idx, hwd->div); + + return cdce706_reg_update(hwd->dev_data, + CDCE706_DIVIDER(hwd->idx), + CDCE706_DIVIDER_DIVIDER_MASK, + hwd->div); +} + +static const struct clk_ops cdce706_divider_ops = { + .set_parent = cdce706_divider_set_parent, + .get_parent = cdce706_divider_get_parent, + .recalc_rate = cdce706_divider_recalc_rate, + .round_rate = cdce706_divider_round_rate, + .set_rate = cdce706_divider_set_rate, +}; + +static int cdce706_clkout_prepare(struct clk_hw *hw) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + return cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx), + CDCE706_CLKOUT_ENABLE_MASK, + CDCE706_CLKOUT_ENABLE_MASK); +} + +static void cdce706_clkout_unprepare(struct clk_hw *hw) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + cdce706_reg_update(hwd->dev_data, CDCE706_CLKOUT(hwd->idx), + CDCE706_CLKOUT_ENABLE_MASK, 0); +} + +static int cdce706_clkout_set_parent(struct clk_hw *hw, u8 index) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + if (hwd->parent == index) + return 0; + hwd->parent = index; + return cdce706_reg_update(hwd->dev_data, + CDCE706_CLKOUT(hwd->idx), + CDCE706_CLKOUT_ENABLE_MASK, index); +} + +static u8 cdce706_clkout_get_parent(struct clk_hw *hw) +{ + struct cdce706_hw_data *hwd = to_hw_data(hw); + + return hwd->parent; +} + +static unsigned long cdce706_clkout_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + return parent_rate; +} + +static long cdce706_clkout_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + *parent_rate = rate; + return rate; +} + +static int cdce706_clkout_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + return 0; +} + +static const struct clk_ops cdce706_clkout_ops = { + .prepare = cdce706_clkout_prepare, + .unprepare = cdce706_clkout_unprepare, + .set_parent = cdce706_clkout_set_parent, + .get_parent = cdce706_clkout_get_parent, + .recalc_rate = cdce706_clkout_recalc_rate, + .round_rate = cdce706_clkout_round_rate, + .set_rate = cdce706_clkout_set_rate, +}; + +static int cdce706_register_hw(struct cdce706_dev_data *cdce, + struct cdce706_hw_data *hw, unsigned num_hw, + const char * const *clk_names, + struct clk_init_data *init) +{ + unsigned i; + + for (i = 0; i < num_hw; ++i, ++hw) { + init->name = clk_names[i]; + hw->dev_data = cdce; + hw->idx = i; + hw->hw.init = init; + hw->clk = devm_clk_register(&cdce->client->dev, + &hw->hw); + if (IS_ERR(hw->clk)) { + dev_err(&cdce->client->dev, "Failed to register %s\n", + clk_names[i]); + return PTR_ERR(hw->clk); + } + } + return 0; +} + +static int cdce706_register_clkin(struct cdce706_dev_data *cdce) +{ + struct clk_init_data init = { + .ops = &cdce706_clkin_ops, + .parent_names = cdce->clkin_name, + .num_parents = ARRAY_SIZE(cdce->clkin_name), + }; + unsigned i; + int ret; + unsigned clock, source; + + for (i = 0; i < ARRAY_SIZE(cdce->clkin_name); ++i) { + struct clk *parent = devm_clk_get(&cdce->client->dev, + cdce706_source_name[i]); + + if (IS_ERR(parent)) { + cdce->clkin_name[i] = cdce706_source_name[i]; + } else { + cdce->clkin_name[i] = __clk_get_name(parent); + cdce->clkin_clk[i] = parent; + } + } + + ret = cdce706_reg_read(cdce, CDCE706_CLKIN_SOURCE, &source); + if (ret < 0) + return ret; + if ((source & CDCE706_CLKIN_SOURCE_MASK) == + CDCE706_CLKIN_SOURCE_LVCMOS) { + ret = cdce706_reg_read(cdce, CDCE706_CLKIN_CLOCK, &clock); + if (ret < 0) + return ret; + cdce->clkin[0].parent = !!(clock & CDCE706_CLKIN_CLOCK_MASK); + } + + ret = cdce706_register_hw(cdce, cdce->clkin, + ARRAY_SIZE(cdce->clkin), + cdce706_clkin_name, &init); + return ret; +} + +static int cdce706_register_plls(struct cdce706_dev_data *cdce) +{ + struct clk_init_data init = { + .ops = &cdce706_pll_ops, + .parent_names = cdce706_clkin_name, + .num_parents = ARRAY_SIZE(cdce706_clkin_name), + }; + unsigned i; + int ret; + unsigned mux; + + ret = cdce706_reg_read(cdce, CDCE706_PLL_MUX, &mux); + if (ret < 0) + return ret; + + for (i = 0; i < ARRAY_SIZE(cdce->pll); ++i) { + unsigned m, n, v; + + ret = cdce706_reg_read(cdce, CDCE706_PLL_M_LOW(i), &m); + if (ret < 0) + return ret; + ret = cdce706_reg_read(cdce, CDCE706_PLL_N_LOW(i), &n); + if (ret < 0) + return ret; + ret = cdce706_reg_read(cdce, CDCE706_PLL_HI(i), &v); + if (ret < 0) + return ret; + cdce->pll[i].div = m | ((v & CDCE706_PLL_HI_M_MASK) << 8); + cdce->pll[i].mul = n | ((v & CDCE706_PLL_HI_N_MASK) << + (8 - CDCE706_PLL_HI_N_SHIFT)); + cdce->pll[i].mux = mux & CDCE706_PLL_MUX_MASK(i); + dev_dbg(&cdce->client->dev, + "%s: i: %u, div: %u, mul: %u, mux: %d\n", __func__, i, + cdce->pll[i].div, cdce->pll[i].mul, cdce->pll[i].mux); + } + + ret = cdce706_register_hw(cdce, cdce->pll, + ARRAY_SIZE(cdce->pll), + cdce706_pll_name, &init); + return ret; +} + +static int cdce706_register_dividers(struct cdce706_dev_data *cdce) +{ + struct clk_init_data init = { + .ops = &cdce706_divider_ops, + .parent_names = cdce706_divider_parent_name, + .num_parents = ARRAY_SIZE(cdce706_divider_parent_name), + .flags = CLK_SET_RATE_PARENT, + }; + unsigned i; + int ret; + + for (i = 0; i < ARRAY_SIZE(cdce->divider); ++i) { + unsigned val; + + ret = cdce706_reg_read(cdce, CDCE706_DIVIDER_PLL(i), &val); + if (ret < 0) + return ret; + cdce->divider[i].parent = + (val & CDCE706_DIVIDER_PLL_MASK(i)) >> + CDCE706_DIVIDER_PLL_SHIFT(i); + + ret = cdce706_reg_read(cdce, CDCE706_DIVIDER(i), &val); + if (ret < 0) + return ret; + cdce->divider[i].div = val & CDCE706_DIVIDER_DIVIDER_MASK; + dev_dbg(&cdce->client->dev, + "%s: i: %u, parent: %u, div: %u\n", __func__, i, + cdce->divider[i].parent, cdce->divider[i].div); + } + + ret = cdce706_register_hw(cdce, cdce->divider, + ARRAY_SIZE(cdce->divider), + cdce706_divider_name, &init); + return ret; +} + +static int cdce706_register_clkouts(struct cdce706_dev_data *cdce) +{ + struct clk_init_data init = { + .ops = &cdce706_clkout_ops, + .parent_names = cdce706_divider_name, + .num_parents = ARRAY_SIZE(cdce706_divider_name), + .flags = CLK_SET_RATE_PARENT, + }; + unsigned i; + int ret; + + for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) { + unsigned val; + + ret = cdce706_reg_read(cdce, CDCE706_CLKOUT(i), &val); + if (ret < 0) + return ret; + cdce->clkout[i].parent = val & CDCE706_CLKOUT_DIVIDER_MASK; + dev_dbg(&cdce->client->dev, + "%s: i: %u, parent: %u\n", __func__, i, + cdce->clkout[i].parent); + } + + ret = cdce706_register_hw(cdce, cdce->clkout, + ARRAY_SIZE(cdce->clkout), + cdce706_clkout_name, &init); + for (i = 0; i < ARRAY_SIZE(cdce->clkout); ++i) + cdce->clks[i] = cdce->clkout[i].clk; + + return ret; +} + +static int cdce706_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct cdce706_dev_data *cdce; + int ret; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + return -EIO; + + cdce = devm_kzalloc(&client->dev, sizeof(*cdce), GFP_KERNEL); + if (!cdce) + return -ENOMEM; + + cdce->client = client; + cdce->regmap = devm_regmap_init_i2c(client, &cdce706_regmap_config); + if (IS_ERR(cdce->regmap)) { + dev_err(&client->dev, "Failed to initialize regmap\n"); + return -EINVAL; + } + + i2c_set_clientdata(client, cdce); + + ret = cdce706_register_clkin(cdce); + if (ret < 0) + return ret; + ret = cdce706_register_plls(cdce); + if (ret < 0) + return ret; + ret = cdce706_register_dividers(cdce); + if (ret < 0) + return ret; + ret = cdce706_register_clkouts(cdce); + if (ret < 0) + return ret; + cdce->onecell.clks = cdce->clks; + cdce->onecell.clk_num = ARRAY_SIZE(cdce->clks); + ret = of_clk_add_provider(client->dev.of_node, of_clk_src_onecell_get, + &cdce->onecell); + + return ret; +} + +static int cdce706_remove(struct i2c_client *client) +{ + return 0; +} + + +#ifdef CONFIG_OF +static const struct of_device_id cdce706_dt_match[] = { + { .compatible = "ti,cdce706" }, + { }, +}; +MODULE_DEVICE_TABLE(of, cdce706_dt_match); +#endif + +static const struct i2c_device_id cdce706_id[] = { + { "cdce706", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, cdce706_id); + +static struct i2c_driver cdce706_i2c_driver = { + .driver = { + .name = "cdce706", + .of_match_table = of_match_ptr(cdce706_dt_match), + }, + .probe = cdce706_probe, + .remove = cdce706_remove, + .id_table = cdce706_id, +}; +module_i2c_driver(cdce706_i2c_driver); + +MODULE_AUTHOR("Max Filippov <jcmvbkbc@gmail.com>"); +MODULE_DESCRIPTION("TI CDCE 706 clock synthesizer driver"); +MODULE_LICENSE("GPL"); |