diff options
author | Paul Cercueil <paul@crapouillou.net> | 2021-05-30 17:49:19 +0100 |
---|---|---|
committer | Stephen Boyd <sboyd@kernel.org> | 2021-06-27 19:49:17 -0700 |
commit | 249592bf6d5d52cacdc2f5a07f23368fc1b11324 (patch) | |
tree | 037c1a9a90e52d1d249d83c6996dd65214f92794 | |
parent | 2e1ae04f7fe049bb012c273e5281a3c145924ea1 (diff) |
clk: Support bypassing dividers
When a clock is declared as both CGU_CLK_DIV and CGU_CLK_MUX, the CGU
code expects the mux to be applied first, the divider second.
On the JZ4760, and maybe on some other SoCs, some clocks also have a mux
setting and a divider, but the divider is not applied to all parents
selectable from the mux.
This could be solved by creating two clocks, one with CGU_CLK_DIV and
one with CGU_CLK_MUX, but that would increase the number of clocks.
Instead, add a 8-bit mask to CGU_CLK_DIV clocks. If the bit
corresponding to the parent clock's index is set, the divider is
bypassed.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://lore.kernel.org/r/20210530164923.18134-3-paul@crapouillou.net
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
-rw-r--r-- | drivers/clk/ingenic/cgu.c | 33 | ||||
-rw-r--r-- | drivers/clk/ingenic/cgu.h | 2 | ||||
-rw-r--r-- | drivers/clk/ingenic/jz4725b-cgu.c | 12 | ||||
-rw-r--r-- | drivers/clk/ingenic/jz4740-cgu.c | 12 | ||||
-rw-r--r-- | drivers/clk/ingenic/jz4770-cgu.c | 12 |
5 files changed, 42 insertions, 29 deletions
diff --git a/drivers/clk/ingenic/cgu.c b/drivers/clk/ingenic/cgu.c index c8e9cb6c8e39..0619d45a950c 100644 --- a/drivers/clk/ingenic/cgu.c +++ b/drivers/clk/ingenic/cgu.c @@ -369,18 +369,23 @@ ingenic_clk_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) struct ingenic_cgu *cgu = ingenic_clk->cgu; unsigned long rate = parent_rate; u32 div_reg, div; + u8 parent; if (clk_info->type & CGU_CLK_DIV) { - div_reg = readl(cgu->base + clk_info->div.reg); - div = (div_reg >> clk_info->div.shift) & - GENMASK(clk_info->div.bits - 1, 0); + parent = ingenic_clk_get_parent(hw); - if (clk_info->div.div_table) - div = clk_info->div.div_table[div]; - else - div = (div + 1) * clk_info->div.div; + if (!(clk_info->div.bypass_mask & BIT(parent))) { + div_reg = readl(cgu->base + clk_info->div.reg); + div = (div_reg >> clk_info->div.shift) & + GENMASK(clk_info->div.bits - 1, 0); + + if (clk_info->div.div_table) + div = clk_info->div.div_table[div]; + else + div = (div + 1) * clk_info->div.div; - rate /= div; + rate /= div; + } } else if (clk_info->type & CGU_CLK_FIXDIV) { rate /= clk_info->fixdiv.div; } @@ -410,10 +415,16 @@ ingenic_clk_calc_hw_div(const struct ingenic_cgu_clk_info *clk_info, } static unsigned -ingenic_clk_calc_div(const struct ingenic_cgu_clk_info *clk_info, +ingenic_clk_calc_div(struct clk_hw *hw, + const struct ingenic_cgu_clk_info *clk_info, unsigned long parent_rate, unsigned long req_rate) { unsigned int div, hw_div; + u8 parent; + + parent = ingenic_clk_get_parent(hw); + if (clk_info->div.bypass_mask & BIT(parent)) + return 1; /* calculate the divide */ div = DIV_ROUND_UP(parent_rate, req_rate); @@ -448,7 +459,7 @@ ingenic_clk_round_rate(struct clk_hw *hw, unsigned long req_rate, unsigned int div = 1; if (clk_info->type & CGU_CLK_DIV) - div = ingenic_clk_calc_div(clk_info, *parent_rate, req_rate); + div = ingenic_clk_calc_div(hw, clk_info, *parent_rate, req_rate); else if (clk_info->type & CGU_CLK_FIXDIV) div = clk_info->fixdiv.div; else if (clk_hw_can_set_rate_parent(hw)) @@ -480,7 +491,7 @@ ingenic_clk_set_rate(struct clk_hw *hw, unsigned long req_rate, int ret = 0; if (clk_info->type & CGU_CLK_DIV) { - div = ingenic_clk_calc_div(clk_info, parent_rate, req_rate); + div = ingenic_clk_calc_div(hw, clk_info, parent_rate, req_rate); rate = DIV_ROUND_UP(parent_rate, div); if (rate != req_rate) diff --git a/drivers/clk/ingenic/cgu.h b/drivers/clk/ingenic/cgu.h index 2c75ef4a36f5..44d97a259692 100644 --- a/drivers/clk/ingenic/cgu.h +++ b/drivers/clk/ingenic/cgu.h @@ -84,6 +84,7 @@ struct ingenic_cgu_mux_info { * isn't one * @busy_bit: the index of the busy bit within reg, or -1 if there isn't one * @stop_bit: the index of the stop bit within reg, or -1 if there isn't one + * @bypass_mask: mask of parent clocks for which the divider does not apply * @div_table: optional table to map the value read from the register to the * actual divider value */ @@ -95,6 +96,7 @@ struct ingenic_cgu_div_info { s8 ce_bit; s8 busy_bit; s8 stop_bit; + u8 bypass_mask; const u8 *div_table; }; diff --git a/drivers/clk/ingenic/jz4725b-cgu.c b/drivers/clk/ingenic/jz4725b-cgu.c index 8c38e72d14a7..5154b0cf8ad6 100644 --- a/drivers/clk/ingenic/jz4725b-cgu.c +++ b/drivers/clk/ingenic/jz4725b-cgu.c @@ -80,7 +80,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "pll half", CGU_CLK_DIV, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1, + CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1, 0, jz4725b_cgu_pll_half_div_table, }, }, @@ -89,7 +89,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "cclk", CGU_CLK_DIV, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, 0, jz4725b_cgu_cpccr_div_table, }, }, @@ -98,7 +98,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "hclk", CGU_CLK_DIV, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, 0, jz4725b_cgu_cpccr_div_table, }, }, @@ -107,7 +107,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "pclk", CGU_CLK_DIV, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, 0, jz4725b_cgu_cpccr_div_table, }, }, @@ -116,7 +116,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "mclk", CGU_CLK_DIV, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, 0, jz4725b_cgu_cpccr_div_table, }, }, @@ -125,7 +125,7 @@ static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = { "ipu", CGU_CLK_DIV | CGU_CLK_GATE, .parents = { JZ4725B_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1, 0, jz4725b_cgu_cpccr_div_table, }, .gate = { CGU_REG_CLKGR, 13 }, diff --git a/drivers/clk/ingenic/jz4740-cgu.c b/drivers/clk/ingenic/jz4740-cgu.c index c0ac9196a581..cd878f08aca3 100644 --- a/drivers/clk/ingenic/jz4740-cgu.c +++ b/drivers/clk/ingenic/jz4740-cgu.c @@ -95,7 +95,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "pll half", CGU_CLK_DIV, .parents = { JZ4740_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1, + CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1, 0, jz4740_cgu_pll_half_div_table, }, }, @@ -104,7 +104,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "cclk", CGU_CLK_DIV, .parents = { JZ4740_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, 0, jz4740_cgu_cpccr_div_table, }, }, @@ -113,7 +113,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "hclk", CGU_CLK_DIV, .parents = { JZ4740_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, 0, jz4740_cgu_cpccr_div_table, }, }, @@ -122,7 +122,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "pclk", CGU_CLK_DIV, .parents = { JZ4740_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, 0, jz4740_cgu_cpccr_div_table, }, }, @@ -131,7 +131,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "mclk", CGU_CLK_DIV, .parents = { JZ4740_CLK_PLL, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, 0, jz4740_cgu_cpccr_div_table, }, }, @@ -140,7 +140,7 @@ static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = { "lcd", CGU_CLK_DIV | CGU_CLK_GATE, .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 }, .div = { - CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1, + CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1, 0, jz4740_cgu_cpccr_div_table, }, .gate = { CGU_REG_CLKGR, 10 }, diff --git a/drivers/clk/ingenic/jz4770-cgu.c b/drivers/clk/ingenic/jz4770-cgu.c index 9ea4490ecb7f..381a27f20b51 100644 --- a/drivers/clk/ingenic/jz4770-cgu.c +++ b/drivers/clk/ingenic/jz4770-cgu.c @@ -152,7 +152,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "cclk", CGU_CLK_DIV, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, }, @@ -160,7 +160,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "h0clk", CGU_CLK_DIV, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, }, @@ -168,7 +168,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "h1clk", CGU_CLK_DIV | CGU_CLK_GATE, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 24, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 24, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, .gate = { CGU_REG_CLKGR1, 7 }, @@ -177,7 +177,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "h2clk", CGU_CLK_DIV, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, }, @@ -185,7 +185,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "c1clk", CGU_CLK_DIV | CGU_CLK_GATE, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, .gate = { CGU_REG_OPCR, 31, true }, // disable CCLK stop on idle @@ -194,7 +194,7 @@ static const struct ingenic_cgu_clk_info jz4770_cgu_clocks[] = { "pclk", CGU_CLK_DIV, .parents = { JZ4770_CLK_PLL0, }, .div = { - CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, + CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1, 0, jz4770_cgu_cpccr_div_table, }, }, |