diff options
| -rw-r--r-- | drivers/mmc/host/meson-gx-mmc.c | 290 |
1 files changed, 13 insertions, 277 deletions
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 0454021c9ff5..acdc5520d02c 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -49,6 +49,8 @@ #define CLK_CORE_PHASE_MASK GENMASK(9, 8) #define CLK_TX_PHASE_MASK GENMASK(11, 10) #define CLK_RX_PHASE_MASK GENMASK(13, 12) +#define CLK_PHASE_0 0 +#define CLK_PHASE_180 2 #define CLK_V2_TX_DELAY_MASK GENMASK(19, 16) #define CLK_V2_RX_DELAY_MASK GENMASK(23, 20) #define CLK_V2_ALWAYS_ON BIT(24) @@ -57,10 +59,6 @@ #define CLK_V3_RX_DELAY_MASK GENMASK(27, 22) #define CLK_V3_ALWAYS_ON BIT(28) -#define CLK_DELAY_STEP_PS 200 -#define CLK_PHASE_STEP 30 -#define CLK_PHASE_POINT_NUM (360 / CLK_PHASE_STEP) - #define CLK_TX_DELAY_MASK(h) (h->data->tx_delay_mask) #define CLK_RX_DELAY_MASK(h) (h->data->rx_delay_mask) #define CLK_ALWAYS_ON(h) (h->data->always_on) @@ -165,9 +163,8 @@ struct meson_host { void __iomem *regs; struct clk *core_clk; + struct clk *mux_clk; struct clk *mmc_clk; - struct clk *rx_clk; - struct clk *tx_clk; unsigned long req_rate; bool ddr; @@ -209,90 +206,6 @@ struct meson_host { #define CMD_RESP_MASK GENMASK(31, 1) #define CMD_RESP_SRAM BIT(0) -struct meson_mmc_phase { - struct clk_hw hw; - void __iomem *reg; - unsigned long phase_mask; - unsigned long delay_mask; - unsigned int delay_step_ps; -}; - -#define to_meson_mmc_phase(_hw) container_of(_hw, struct meson_mmc_phase, hw) - -static int meson_mmc_clk_get_phase(struct clk_hw *hw) -{ - struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw); - unsigned int phase_num = 1 << hweight_long(mmc->phase_mask); - unsigned long period_ps, p, d; - int degrees; - u32 val; - - val = readl(mmc->reg); - p = (val & mmc->phase_mask) >> __ffs(mmc->phase_mask); - degrees = p * 360 / phase_num; - - if (mmc->delay_mask) { - period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000, - clk_get_rate(hw->clk)); - d = (val & mmc->delay_mask) >> __ffs(mmc->delay_mask); - degrees += d * mmc->delay_step_ps * 360 / period_ps; - degrees %= 360; - } - - return degrees; -} - -static void meson_mmc_apply_phase_delay(struct meson_mmc_phase *mmc, - unsigned int phase, - unsigned int delay) -{ - u32 val; - - val = readl(mmc->reg); - val &= ~mmc->phase_mask; - val |= phase << __ffs(mmc->phase_mask); - - if (mmc->delay_mask) { - val &= ~mmc->delay_mask; - val |= delay << __ffs(mmc->delay_mask); - } - - writel(val, mmc->reg); -} - -static int meson_mmc_clk_set_phase(struct clk_hw *hw, int degrees) -{ - struct meson_mmc_phase *mmc = to_meson_mmc_phase(hw); - unsigned int phase_num = 1 << hweight_long(mmc->phase_mask); - unsigned long period_ps, d = 0, r; - uint64_t p; - - p = degrees % 360; - - if (!mmc->delay_mask) { - p = DIV_ROUND_CLOSEST_ULL(p, 360 / phase_num); - } else { - period_ps = DIV_ROUND_UP((unsigned long)NSEC_PER_SEC * 1000, - clk_get_rate(hw->clk)); - - /* First compute the phase index (p), the remainder (r) is the - * part we'll try to acheive using the delays (d). - */ - r = do_div(p, 360 / phase_num); - d = DIV_ROUND_CLOSEST(r * period_ps, - 360 * mmc->delay_step_ps); - d = min(d, mmc->delay_mask >> __ffs(mmc->delay_mask)); - } - - meson_mmc_apply_phase_delay(mmc, p, d); - return 0; -} - -static const struct clk_ops meson_mmc_clk_phase_ops = { - .get_phase = meson_mmc_clk_get_phase, - .set_phase = meson_mmc_clk_set_phase, -}; - static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data *data) { unsigned int timeout = data->timeout_ns / NSEC_PER_MSEC; @@ -492,8 +405,6 @@ static int meson_mmc_clk_init(struct meson_host *host) struct clk_init_data init; struct clk_mux *mux; struct clk_divider *div; - struct meson_mmc_phase *core, *tx, *rx; - struct clk *clk; char clk_name[32]; int i, ret = 0; const char *mux_parent_names[MUX_CLK_NUM_PARENTS]; @@ -501,9 +412,11 @@ static int meson_mmc_clk_init(struct meson_host *host) u32 clk_reg; /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ - clk_reg = 0; - clk_reg |= CLK_ALWAYS_ON(host); + clk_reg = CLK_ALWAYS_ON(host); clk_reg |= CLK_DIV_MASK; + clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180); + clk_reg |= FIELD_PREP(CLK_TX_PHASE_MASK, CLK_PHASE_0); + clk_reg |= FIELD_PREP(CLK_RX_PHASE_MASK, CLK_PHASE_0); writel(clk_reg, host->regs + SD_EMMC_CLOCK); /* get the mux parents */ @@ -539,9 +452,9 @@ static int meson_mmc_clk_init(struct meson_host *host) mux->mask = CLK_SRC_MASK >> mux->shift; mux->hw.init = &init; - clk = devm_clk_register(host->dev, &mux->hw); - if (WARN_ON(IS_ERR(clk))) - return PTR_ERR(clk); + host->mux_clk = devm_clk_register(host->dev, &mux->hw); + if (WARN_ON(IS_ERR(host->mux_clk))) + return PTR_ERR(host->mux_clk); /* create the divider */ div = devm_kzalloc(host->dev, sizeof(*div), GFP_KERNEL); @@ -552,7 +465,7 @@ static int meson_mmc_clk_init(struct meson_host *host) init.name = clk_name; init.ops = &clk_divider_ops; init.flags = CLK_SET_RATE_PARENT; - clk_parent[0] = __clk_get_name(clk); + clk_parent[0] = __clk_get_name(host->mux_clk); init.parent_names = clk_parent; init.num_parents = 1; @@ -562,192 +475,19 @@ static int meson_mmc_clk_init(struct meson_host *host) div->hw.init = &init; div->flags = CLK_DIVIDER_ONE_BASED; - clk = devm_clk_register(host->dev, &div->hw); - if (WARN_ON(IS_ERR(clk))) - return PTR_ERR(clk); - - /* create the mmc core clock */ - core = devm_kzalloc(host->dev, sizeof(*core), GFP_KERNEL); - if (!core) - return -ENOMEM; - - snprintf(clk_name, sizeof(clk_name), "%s#core", dev_name(host->dev)); - init.name = clk_name; - init.ops = &meson_mmc_clk_phase_ops; - init.flags = CLK_SET_RATE_PARENT; - clk_parent[0] = __clk_get_name(clk); - init.parent_names = clk_parent; - init.num_parents = 1; - - core->reg = host->regs + SD_EMMC_CLOCK; - core->phase_mask = CLK_CORE_PHASE_MASK; - core->hw.init = &init; - - host->mmc_clk = devm_clk_register(host->dev, &core->hw); - if (WARN_ON(PTR_ERR_OR_ZERO(host->mmc_clk))) + host->mmc_clk = devm_clk_register(host->dev, &div->hw); + if (WARN_ON(IS_ERR(host->mmc_clk))) return PTR_ERR(host->mmc_clk); - /* create the mmc tx clock */ - tx = devm_kzalloc(host->dev, sizeof(*tx), GFP_KERNEL); - if (!tx) - return -ENOMEM; - - snprintf(clk_name, sizeof(clk_name), "%s#tx", dev_name(host->dev)); - init.name = clk_name; - init.ops = &meson_mmc_clk_phase_ops; - init.flags = 0; - clk_parent[0] = __clk_get_name(host->mmc_clk); - init.parent_names = clk_parent; - init.num_parents = 1; - - tx->reg = host->regs + SD_EMMC_CLOCK; - tx->phase_mask = CLK_TX_PHASE_MASK; - tx->delay_mask = CLK_TX_DELAY_MASK(host); - tx->delay_step_ps = CLK_DELAY_STEP_PS; - tx->hw.init = &init; - - host->tx_clk = devm_clk_register(host->dev, &tx->hw); - if (WARN_ON(PTR_ERR_OR_ZERO(host->tx_clk))) - return PTR_ERR(host->tx_clk); - - /* create the mmc rx clock */ - rx = devm_kzalloc(host->dev, sizeof(*rx), GFP_KERNEL); - if (!rx) - return -ENOMEM; - - snprintf(clk_name, sizeof(clk_name), "%s#rx", dev_name(host->dev)); - init.name = clk_name; - init.ops = &meson_mmc_clk_phase_ops; - init.flags = 0; - clk_parent[0] = __clk_get_name(host->mmc_clk); - init.parent_names = clk_parent; - init.num_parents = 1; - - rx->reg = host->regs + SD_EMMC_CLOCK; - rx->phase_mask = CLK_RX_PHASE_MASK; - rx->delay_mask = CLK_RX_DELAY_MASK(host); - rx->delay_step_ps = CLK_DELAY_STEP_PS; - rx->hw.init = &init; - - host->rx_clk = devm_clk_register(host->dev, &rx->hw); - if (WARN_ON(PTR_ERR_OR_ZERO(host->rx_clk))) - return PTR_ERR(host->rx_clk); - /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ host->mmc->f_min = clk_round_rate(host->mmc_clk, 400000); ret = clk_set_rate(host->mmc_clk, host->mmc->f_min); if (ret) return ret; - clk_set_phase(host->mmc_clk, 180); - clk_set_phase(host->tx_clk, 0); - clk_set_phase(host->rx_clk, 0); - return clk_prepare_enable(host->mmc_clk); } -static void meson_mmc_shift_map(unsigned long *map, unsigned long shift) -{ - DECLARE_BITMAP(left, CLK_PHASE_POINT_NUM); - DECLARE_BITMAP(right, CLK_PHASE_POINT_NUM); - - /* - * shift the bitmap right and reintroduce the dropped bits on the left - * of the bitmap - */ - bitmap_shift_right(right, map, shift, CLK_PHASE_POINT_NUM); - bitmap_shift_left(left, map, CLK_PHASE_POINT_NUM - shift, - CLK_PHASE_POINT_NUM); - bitmap_or(map, left, right, CLK_PHASE_POINT_NUM); -} - -static void meson_mmc_find_next_region(unsigned long *map, - unsigned long *start, - unsigned long *stop) -{ - *start = find_next_bit(map, CLK_PHASE_POINT_NUM, *start); - *stop = find_next_zero_bit(map, CLK_PHASE_POINT_NUM, *start); -} - -static int meson_mmc_find_tuning_point(unsigned long *test) -{ - unsigned long shift, stop, offset = 0, start = 0, size = 0; - - /* Get the all good/all bad situation out the way */ - if (bitmap_full(test, CLK_PHASE_POINT_NUM)) - return 0; /* All points are good so point 0 will do */ - else if (bitmap_empty(test, CLK_PHASE_POINT_NUM)) - return -EIO; /* No successful tuning point */ - - /* - * Now we know there is a least one region find. Make sure it does - * not wrap by the shifting the bitmap if necessary - */ - shift = find_first_zero_bit(test, CLK_PHASE_POINT_NUM); - if (shift != 0) - meson_mmc_shift_map(test, shift); - - while (start < CLK_PHASE_POINT_NUM) { - meson_mmc_find_next_region(test, &start, &stop); - - if ((stop - start) > size) { - offset = start; - size = stop - start; - } - - start = stop; - } - - /* Get the center point of the region */ - offset += (size / 2); - - /* Shift the result back */ - offset = (offset + shift) % CLK_PHASE_POINT_NUM; - - return offset; -} - -static int meson_mmc_clk_phase_tuning(struct mmc_host *mmc, u32 opcode, - struct clk *clk) -{ - int point, ret; - DECLARE_BITMAP(test, CLK_PHASE_POINT_NUM); - - dev_dbg(mmc_dev(mmc), "%s phase/delay tunning...\n", - __clk_get_name(clk)); - bitmap_zero(test, CLK_PHASE_POINT_NUM); - - /* Explore tuning points */ - for (point = 0; point < CLK_PHASE_POINT_NUM; point++) { - clk_set_phase(clk, point * CLK_PHASE_STEP); - ret = mmc_send_tuning(mmc, opcode, NULL); - if (!ret) - set_bit(point, test); - } - - /* Find the optimal tuning point and apply it */ - point = meson_mmc_find_tuning_point(test); - if (point < 0) - return point; /* tuning failed */ - - clk_set_phase(clk, point * CLK_PHASE_STEP); - dev_dbg(mmc_dev(mmc), "success with phase: %d\n", - clk_get_phase(clk)); - return 0; -} - -static int meson_mmc_execute_tuning(struct mmc_host *mmc, u32 opcode) -{ - struct meson_host *host = mmc_priv(mmc); - int adj = 0; - - /* enable signal resampling w/o delay */ - adj = ADJUST_ADJ_EN; - writel(adj, host->regs + host->data->adjust); - - return meson_mmc_clk_phase_tuning(mmc, opcode, host->rx_clk); -} - static int meson_mmc_prepare_ios_clock(struct meson_host *host, struct mmc_ios *ios) { @@ -796,9 +536,6 @@ static void meson_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) /* disable signal resampling */ writel(0, host->regs + host->data->adjust); - /* Reset rx phase */ - clk_set_phase(host->rx_clk, 0); - break; case MMC_POWER_ON: @@ -1226,7 +963,6 @@ static const struct mmc_host_ops meson_mmc_ops = { .get_cd = meson_mmc_get_cd, .pre_req = meson_mmc_pre_req, .post_req = meson_mmc_post_req, - .execute_tuning = meson_mmc_execute_tuning, .card_busy = meson_mmc_card_busy, .start_signal_voltage_switch = meson_mmc_voltage_switch, }; |