From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Wu Subject: [PATCH v7 8/9] i2c: rk3x: add i2c support for rk3399 soc Date: Wed, 4 May 2016 22:36:49 +0800 Message-ID: <1462372609-6535-1-git-send-email-david.wu@rock-chips.com> References: <1462371194-5809-1-git-send-email-david.wu@rock-chips.com> Content-Type: text/plain; charset="utf-8" Return-path: In-Reply-To: <1462371194-5809-1-git-send-email-david.wu@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org To: heiko@sntech.de, wsa@the-dreams.de Cc: robh+dt@kernel.org, dianders@chromium.org, andy.shevchenko@gmail.com, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, briannorris@google.com, davidriley@google.com, huangtao@rock-chips.com, hl@rock-chips.com, xjq@rock-chips.com, zyw@rock-chips.com, cf@rock-chips.com, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, David Wu List-Id: devicetree@vger.kernel.org - new method to caculate i2c timings for rk3399: There was an timing issue about "repeated start" time at the I2C controller of version0, controller appears to drop SDA at .875x (7/8) programmed clk high. On version 1 of the controller, the rule(.875x) isn't enough to meet tSU;STA requirements on 100k's Standard-mode. To resolve this issue, sda_update_config, start_setup_config and stop_setup_config for I2C timing information are added, new rules are designed to calculate the timing information at new v1. - pclk and function clk are separated at rk3399 Signed-off-by: David Wu --- Changes in v7: - transform into a 9 series patches (Doug) - drop highspeed with mastercode, and support fast-mode plus (Doug) Changes in v6: - add master code send for HS mode - use assigned-clocks mechanism for clock rate set form DT (Heiko) Changes in v5: - use compatible to seperate from different version - can caculate highspeed clk rate Changes in v4: - pclk and sclk are treated individually - use switch-case to seperate from different version (Andy) - fix dead loop form Julia's notice Change in v3: - Too many arguments for ops func, use struct for them (Andy) drivers/i2c/busses/i2c-rk3x.c | 266 ++++++++++++++++++++++++++++++++++++++---- 1 file changed, 243 insertions(+), 23 deletions(-) diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 408f9ab..47368c4 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -58,6 +58,10 @@ enum { #define REG_CON_LASTACK BIT(5) /* 1: send NACK after last received byte */ #define REG_CON_ACTACK BIT(6) /* 1: stop if NACK is received */ +#define REG_CON_SDA_CFG(cfg) ((cfg) << 8) +#define REG_CON_STA_CFG(cfg) ((cfg) << 12) +#define REG_CON_STO_CFG(cfg) ((cfg) << 14) + /* REG_MRXADDR bits */ #define REG_MRXADDR_VALID(x) BIT(24 + (x)) /* [x*8+7:x*8] of MRX[R]ADDR valid */ @@ -124,10 +128,15 @@ static const struct i2c_spec_values fast_mode_spec = { * struct rk3x_i2c_calced_timings: * @div_low: Divider output for low * @div_high: Divider output for high + * @tuning: Used to adjust setup/hold data time, + * setup/hold start time and setup stop time for + * v1's calc_timings, the tuning should all be 0 + * for old hardware anyone using v0's calc_timings. */ struct rk3x_i2c_calced_timings { unsigned long div_low; unsigned long div_high; + unsigned int tuning; }; enum rk3x_i2c_state { @@ -141,9 +150,12 @@ enum rk3x_i2c_state { /** * @grf_offset: offset inside the grf regmap for setting the i2c type + * @calc_timings: Callback function for i2c timing information calculated */ struct rk3x_i2c_soc_data { int grf_offset; + int (*calc_timings)(unsigned long, struct i2c_timings *, + struct rk3x_i2c_calced_timings *); }; /** @@ -152,9 +164,11 @@ struct rk3x_i2c_soc_data { * @dev: device for this controller * @soc_data: related soc data struct * @regs: virtual memory area - * @clk: clock of i2c bus + * @clk: function clk for rk3399 or function & Bus clks for others + * @pclk: Bus clk for rk3399 * @clk_rate_nb: i2c clk rate change notify * @t: I2C known timing information + * @t_calc: I2C timing information need to be calculated * @lock: spinlock for the i2c bus * @wait: the waitqueue to wait for i2c transfer * @busy: the condition for the event to wait for @@ -174,10 +188,12 @@ struct rk3x_i2c { /* Hardware resources */ void __iomem *regs; struct clk *clk; + struct clk *pclk; struct notifier_block clk_rate_nb; /* Settings */ struct i2c_timings t; + struct rk3x_i2c_calced_timings t_calc; /* Synchronization & notification */ spinlock_t lock; @@ -218,13 +234,13 @@ static inline void rk3x_i2c_clean_ipd(struct rk3x_i2c *i2c) */ static void rk3x_i2c_start(struct rk3x_i2c *i2c) { - u32 val; + u32 val = i2c->t_calc.tuning; i2c->state = STATE_START; i2c_writel(i2c, REG_INT_START, REG_IEN); /* enable adapter with correct mode, send START condition */ - val = REG_CON_EN | REG_CON_MOD(i2c->mode) | REG_CON_START; + val |= REG_CON_EN | REG_CON_MOD(i2c->mode) | REG_CON_START; /* if we want to react to NACK, set ACTACK bit */ if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) @@ -533,9 +549,9 @@ static const struct i2c_spec_values *rk3x_i2c_get_spec(unsigned int speed) * a best-effort divider value is returned in divs. If the target rate is * too high, we silently use the highest possible rate. */ -static int rk3x_i2c_calc_divs(unsigned long clk_rate, - struct i2c_timings *t, - struct rk3x_i2c_calced_timings *t_calc) +static int rk3x_i2c_v0_calc_timings(unsigned long clk_rate, + struct i2c_timings *t, + struct rk3x_i2c_calced_timings *t_calc) { unsigned long min_low_ns, min_high_ns; unsigned long max_low_ns, min_total_ns; @@ -681,23 +697,189 @@ static int rk3x_i2c_calc_divs(unsigned long clk_rate, return ret; } +/** + * Calculate timing values for desired SCL frequency + * + * @clk_rate: I2C input clock rate + * @t: Known I2C timing information + * @t_calc: Caculated rk3x private timings that would be written into regs + + * Returns: 0 on success, -EINVAL if the goal SCL rate is too slow. In that case + * a best-effort divider value is returned in divs. If the target rate is + * too high, we silently use the highest possible rate. + * The following formulas are v1's method to calculate timings. + * + * l = divl + 1; + * h = divh + 1; + * s = sda_update_config + 1; + * u = start_setup_config + 1; + * p = stop_setup_config + 1; + * T = Tclk_i2c; + + * tHigh = 8 * h * T; + * tLow = 8 * l * T; + + * tHD;sda = (l * s + 1) * T; + * tSU;sda = [(8 - s) * l + 1] * T; + * tI2C = 8 * (l + h) * T; + + * tSU;sta = (8h * u + 1) * T; + * tHD;sta = [8h * (u + 1) - 1] * T; + * tSU;sto = (8h * p + 1) * T; + */ +static int rk3x_i2c_v1_calc_timings(unsigned long clk_rate, + struct i2c_timings *t, + struct rk3x_i2c_calced_timings *t_calc) +{ + unsigned long min_low_ns, min_high_ns, min_total_ns; + unsigned long min_setup_start_ns, min_setup_data_ns; + unsigned long min_setup_stop_ns, max_hold_data_ns; + + unsigned long clk_rate_khz, scl_rate_khz; + + unsigned long min_low_div, min_high_div; + + unsigned long min_div_for_hold, min_total_div; + unsigned long extra_div, extra_low_div; + unsigned long sda_update_cfg, stp_sta_cfg, stp_sto_cfg; + + const struct i2c_spec_values *spec; + int ret = 0; + + /* Support standard-mode and fast-mode */ + if (WARN_ON(t->bus_freq_hz > 400000)) + t->bus_freq_hz = 400000; + + /* prevent scl_rate_khz from becoming 0 */ + if (WARN_ON(t->bus_freq_hz < 1000)) + t->bus_freq_hz = 1000; + + /* + * min_low_ns: The minimum number of ns we need to hold low to + * meet I2C specification, should include fall time. + * min_high_ns: The minimum number of ns we need to hold high to + * meet I2C specification, should include rise time. + */ + spec = rk3x_i2c_get_spec(t->bus_freq_hz); + + /* calculate min-divh and min-divl */ + clk_rate_khz = DIV_ROUND_UP(clk_rate, 1000); + scl_rate_khz = t->bus_freq_hz / 1000; + min_total_div = DIV_ROUND_UP(clk_rate_khz, scl_rate_khz * 8); + + min_high_ns = t->scl_rise_ns + spec->min_high_ns; + min_high_div = DIV_ROUND_UP(clk_rate_khz * min_high_ns, 8 * 1000000); + + min_low_ns = t->scl_fall_ns + spec->min_low_ns; + min_low_div = DIV_ROUND_UP(clk_rate_khz * min_low_ns, 8 * 1000000); + + /* Final divh and divl must be greater than 0, otherwise the + * hardware would not output the i2c clk. + */ + min_high_div = (min_high_div < 1) ? 2 : min_high_div; + min_low_div = (min_low_div < 1) ? 2 : min_low_div; + + /* These are the min dividers needed for min hold times. */ + min_div_for_hold = (min_low_div + min_high_div); + min_total_ns = min_low_ns + min_high_ns; + + /* + * This is the maximum divider so we don't go over the maximum. + * We don't round up here (we round down) since this is a maximum. + */ + if (min_div_for_hold >= min_total_div) { + /* + * Time needed to meet hold requirements is important. + * Just use that. + */ + t_calc->div_low = min_low_div; + t_calc->div_high = min_high_div; + } else { + /* + * We've got to distribute some time among the low and high + * so we don't run too fast. + * We'll try to split things up by the scale of min_low_div and + * min_high_div, biasing slightly towards having a higher div + * for low (spend more time low). + */ + extra_div = min_total_div - min_div_for_hold; + extra_low_div = DIV_ROUND_UP(min_low_div * extra_div, + min_div_for_hold); + + t_calc->div_low = min_low_div + extra_low_div; + t_calc->div_high = min_high_div + (extra_div - extra_low_div); + } + + /* + * calculate sda data hold count by the rules, data_upd_st:3 + * is a appropriate value to reduce calculated times. + */ + for (sda_update_cfg = 3; sda_update_cfg > 0; sda_update_cfg--) { + max_hold_data_ns = DIV_ROUND_UP((sda_update_cfg + * (t_calc->div_low) + 1) + * 1000000, clk_rate_khz); + min_setup_data_ns = DIV_ROUND_UP(((8 - sda_update_cfg) + * (t_calc->div_low) + 1) + * 1000000, clk_rate_khz); + if ((max_hold_data_ns < spec->max_data_hold_ns) && + (min_setup_data_ns > spec->min_data_setup_ns)) + break; + } + + /* calculate setup start config */ + min_setup_start_ns = t->scl_rise_ns + spec->min_setup_start_ns; + stp_sta_cfg = DIV_ROUND_UP(clk_rate_khz * min_setup_start_ns + - 1000000, 8 * 1000000 * (t_calc->div_high)); + + /* calculate setup stop config */ + min_setup_stop_ns = t->scl_rise_ns + spec->min_setup_stop_ns; + stp_sto_cfg = DIV_ROUND_UP(clk_rate_khz * min_setup_stop_ns + - 1000000, 8 * 1000000 * (t_calc->div_high)); + + t_calc->tuning = REG_CON_SDA_CFG(--sda_update_cfg) | + REG_CON_STA_CFG(--stp_sta_cfg) | + REG_CON_STO_CFG(--stp_sto_cfg); + + t_calc->div_low--; + t_calc->div_high--; + + /* Maximum divider supported by hw is 0xffff */ + if (t_calc->div_low > 0xffff) { + t_calc->div_low = 0xffff; + ret = -EINVAL; + } + + if (t_calc->div_high > 0xffff) { + t_calc->div_high = 0xffff; + ret = -EINVAL; + } + + return ret; +} + static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate) { struct i2c_timings *t = &i2c->t; - struct rk3x_i2c_calced_timings calc; + struct rk3x_i2c_calced_timings *calc = &i2c->t_calc; u64 t_low_ns, t_high_ns; int ret; - ret = rk3x_i2c_calc_divs(clk_rate, t, &calc); + ret = i2c->soc_data->calc_timings(clk_rate, t, calc); WARN_ONCE(ret != 0, "Could not reach SCL freq %u", t->bus_freq_hz); - clk_enable(i2c->clk); - i2c_writel(i2c, (calc.div_high << 16) | (calc.div_low & 0xffff), + if (i2c->pclk) + clk_enable(i2c->pclk); + else + clk_enable(i2c->clk); + i2c_writel(i2c, (calc->div_high << 16) | (calc->div_low & 0xffff), REG_CLKDIV); - clk_disable(i2c->clk); + if (i2c->pclk) + clk_disable(i2c->pclk); + else + clk_disable(i2c->clk); - t_low_ns = div_u64(((u64)calc.div_low + 1) * 8 * 1000000000, clk_rate); - t_high_ns = div_u64(((u64)calc.div_high + 1) * 8 * 1000000000, + t_low_ns = div_u64(((u64)calc->div_low + 1) * 8 * 1000000000, clk_rate); + t_high_ns = div_u64(((u64)calc->div_high + 1) * 8 * 1000000000, clk_rate); dev_dbg(i2c->dev, "CLK %lukhz, Req %uns, Act low %lluns high %lluns\n", @@ -728,11 +910,11 @@ static int rk3x_i2c_clk_notifier_cb(struct notifier_block *nb, unsigned long { struct clk_notifier_data *ndata = data; struct rk3x_i2c *i2c = container_of(nb, struct rk3x_i2c, clk_rate_nb); - struct rk3x_i2c_calced_timings calc; switch (event) { case PRE_RATE_CHANGE: - if (rk3x_i2c_calc_divs(ndata->new_rate, &i2c->t, &calc) != 0) + if (i2c->soc_data->calc_timings(ndata->new_rate, &i2c->t, + &i2c->t_calc) != 0) return NOTIFY_STOP; /* scale up */ @@ -847,6 +1029,8 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap, spin_lock_irqsave(&i2c->lock, flags); + if (i2c->pclk) + clk_enable(i2c->pclk); clk_enable(i2c->clk); i2c->is_last_msg = false; @@ -881,7 +1065,8 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap, /* Force a STOP condition without interrupt */ i2c_writel(i2c, 0, REG_IEN); - i2c_writel(i2c, REG_CON_EN | REG_CON_STOP, REG_CON); + i2c_writel(i2c, i2c->t_calc.tuning | REG_CON_EN | + REG_CON_STOP, REG_CON); i2c->state = STATE_IDLE; @@ -896,6 +1081,8 @@ static int rk3x_i2c_xfer(struct i2c_adapter *adap, } clk_disable(i2c->clk); + if (i2c->pclk) + clk_disable(i2c->pclk); spin_unlock_irqrestore(&i2c->lock, flags); return ret < 0 ? ret : num; @@ -913,18 +1100,27 @@ static const struct i2c_algorithm rk3x_i2c_algorithm = { static const struct rk3x_i2c_soc_data rk3066_soc_data = { .grf_offset = 0x154, + .calc_timings = rk3x_i2c_v0_calc_timings, }; static const struct rk3x_i2c_soc_data rk3188_soc_data = { .grf_offset = 0x0a4, + .calc_timings = rk3x_i2c_v0_calc_timings, }; static const struct rk3x_i2c_soc_data rk3228_soc_data = { .grf_offset = -1, + .calc_timings = rk3x_i2c_v0_calc_timings, }; static const struct rk3x_i2c_soc_data rk3288_soc_data = { .grf_offset = -1, + .calc_timings = rk3x_i2c_v0_calc_timings, +}; + +static const struct rk3x_i2c_soc_data rk3399_soc_data = { + .grf_offset = -1, + .calc_timings = rk3x_i2c_v1_calc_timings, }; static const struct of_device_id rk3x_i2c_match[] = { @@ -944,6 +1140,10 @@ static const struct of_device_id rk3x_i2c_match[] = { .compatible = "rockchip,rk3288-i2c", .data = (void *)&rk3288_soc_data }, + { + .compatible = "rockchip,rk3399-i2c", + .data = (void *)&rk3399_soc_data + }, {}, }; MODULE_DEVICE_TABLE(of, rk3x_i2c_match); @@ -983,12 +1183,6 @@ static int rk3x_i2c_probe(struct platform_device *pdev) spin_lock_init(&i2c->lock); init_waitqueue_head(&i2c->wait); - i2c->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(i2c->clk)) { - dev_err(&pdev->dev, "cannot get clock\n"); - return PTR_ERR(i2c->clk); - } - mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); i2c->regs = devm_ioremap_resource(&pdev->dev, mem); if (IS_ERR(i2c->regs)) @@ -1042,17 +1236,38 @@ static int rk3x_i2c_probe(struct platform_device *pdev) platform_set_drvdata(pdev, i2c); + i2c->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(i2c->clk)) { + dev_err(&pdev->dev, "cannot get clock\n"); + return PTR_ERR(i2c->clk); + } + ret = clk_prepare(i2c->clk); if (ret < 0) { dev_err(&pdev->dev, "Could not prepare clock\n"); return ret; } + if (i2c->soc_data->calc_timings == rk3x_i2c_v1_calc_timings) { + i2c->pclk = devm_clk_get(&pdev->dev, "pclk"); + if (IS_ERR(i2c->pclk)) { + dev_err(i2c->dev, "Could not get i2c pclk\n"); + ret = PTR_ERR(i2c->pclk); + goto err_clk; + } + + ret = clk_prepare(i2c->pclk); + if (ret) { + dev_err(i2c->dev, "Could not prepare pclk\n"); + goto err_clk; + } + } + i2c->clk_rate_nb.notifier_call = rk3x_i2c_clk_notifier_cb; ret = clk_notifier_register(i2c->clk, &i2c->clk_rate_nb); if (ret != 0) { dev_err(&pdev->dev, "Unable to register clock notifier\n"); - goto err_clk; + goto err_pclk; } clk_rate = clk_get_rate(i2c->clk); @@ -1070,6 +1285,9 @@ static int rk3x_i2c_probe(struct platform_device *pdev) err_clk_notifier: clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb); +err_pclk: + if (i2c->pclk) + clk_unprepare(i2c->pclk); err_clk: clk_unprepare(i2c->clk); return ret; @@ -1082,6 +1300,8 @@ static int rk3x_i2c_remove(struct platform_device *pdev) i2c_del_adapter(&i2c->adap); clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb); + if (i2c->pclk) + clk_unprepare(i2c->pclk); clk_unprepare(i2c->clk); return 0; -- 1.9.1