| Message ID | 20171003065540.11722-4-joel@jms.id.au |
|---|---|
| State | New |
| Headers | show |
| Series | clk: Add Aspeed clock driver | expand |
On Tue, 2017-10-03 at 17:25 +1030, Joel Stanley wrote: > This registers a platform driver to set up all of the non-core clocks. > > The clocks that have configurable rates are now registered. > > Signed-off-by: Joel Stanley <joel@jms.id.au> > > -- > v4: > - Add eclk div table to fix ast2500 calculation > - Add defines to document the BIT() macros > - Pass dev where we can when registering clocks > - Check for errors when registering clk_hws > v3: > - Fix bclk and eclk calculation > - Seperate out ast2400 and ast25000 for pll calculation > > Signed-off-by: Joel Stanley <joel@jms.id.au> > --- > drivers/clk/clk-aspeed.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 163 insertions(+) > > diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c > index d39cf51a5114..adb295292189 100644 > --- a/drivers/clk/clk-aspeed.c > +++ b/drivers/clk/clk-aspeed.c > @@ -14,6 +14,8 @@ > #include <linux/clk-provider.h> > #include <linux/mfd/syscon.h> > #include <linux/of_address.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > #include <linux/regmap.h> > #include <linux/slab.h> > #include <linux/spinlock.h> > @@ -114,6 +116,32 @@ static const struct aspeed_gate_data aspeed_gates[] __initconst = { > [ASPEED_CLK_GATE_LHCCLK] = { 28, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */ > }; > > +static const char * const eclk_parents[] = {"d1pll", "hpll", "mpll"}; Hate to throw a spanner in the works, but I think we need some extra bits here for handling the AST2400. ECLK with M-PLL as the parent divides the clock rate by 2, there are four cases to handle where the last two cases are inverted, and d1pll isn't a valid parent. Also this table looks to be in reverse order to the field defined in the datasheet. > + > +static const struct clk_div_table ast2500_eclk_div_table[] = { > + { 0x0, 2 }, > + { 0x1, 2 }, > + { 0x2, 3 }, > + { 0x3, 4 }, > + { 0x4, 5 }, > + { 0x5, 6 }, > + { 0x6, 7 }, > + { 0x7, 8 }, > + { 0 } > +}; > + > +static const struct clk_div_table ast2500_mac_div_table[] = { > + { 0x0, 4 }, /* Yep, really. Aspeed confirmed this is correct */ > + { 0x1, 4 }, > + { 0x2, 6 }, > + { 0x3, 8 }, > + { 0x4, 10 }, > + { 0x5, 12 }, > + { 0x6, 14 }, > + { 0x7, 16 }, > + { 0 } > +}; > + > static const struct clk_div_table ast2400_div_table[] = { > { 0x0, 2 }, > { 0x1, 4 }, > @@ -179,6 +207,141 @@ static struct clk_hw *aspeed_ast2500_calc_pll(const char *name, u32 val) > mult, div); > } > > +struct aspeed_clk_soc_data { > + const struct clk_div_table *div_table; > + const struct clk_div_table *mac_div_table; > + const struct clk_div_table *eclk_div_table; > + struct clk_hw *(*calc_pll)(const char *name, u32 val); As a note, I just discovered the D-PLL (and D2-PLL where applicable) frequency function is slightly different to M-PLL and H-PLL on both the AST2400 and AST2500. I don't think that is significant yet, but it's something to watch out for. The point is this callback isn't a general-purpose "calculate a PLL frequency" function, so the name might be inappropriate. > +}; > + > +static const struct aspeed_clk_soc_data ast2500_data = { > + .div_table = ast2500_div_table, > + .mac_div_table = ast2500_mac_div_table, > + .eclk_div_table = ast2500_eclk_div_table, > + .calc_pll = aspeed_ast2500_calc_pll, > +}; > + > +static const struct aspeed_clk_soc_data ast2400_data = { > + .div_table = ast2400_div_table, > + .mac_div_table = ast2400_div_table, > + .eclk_div_table = ast2400_div_table, > + .calc_pll = aspeed_ast2400_calc_pll, > +}; > + > +static int aspeed_clk_probe(struct platform_device *pdev) > +{ > + const struct aspeed_clk_soc_data *soc_data; > + struct device *dev = &pdev->dev; > + struct regmap *map; > + struct clk_hw *hw; > + u32 val, rate; > + > + map = syscon_node_to_regmap(dev->of_node); > + if (IS_ERR(map)) { > + dev_err(dev, "no syscon regmap\n"); > + return PTR_ERR(map); > + } > + > + /* SoC generations share common layouts but have different divisors */ > + soc_data = of_device_get_match_data(dev); > + if (!soc_data) { > + dev_err(dev, "no match data for platform\n"); > + return -EINVAL; > + } > + > + /* UART clock div13 setting */ > + regmap_read(map, ASPEED_MISC_CTRL, &val); > + if (val & UART_DIV13_EN) > + rate = 24000000 / 13; > + else > + rate = 24000000; > + /* TODO: Find the parent data for the uart clock */ > + hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_UART] = hw; > + > + /* > + * Memory controller (M-PLL) PLL. This clock is configured by the > + * bootloader, and is exposed to Linux as a read-only clock rate. > + */ > + regmap_read(map, ASPEED_MPLL_PARAM, &val); > + hw = soc_data->calc_pll("mpll", val); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_MPLL] = hw; > + > + /* SD/SDIO clock divider (TODO: There's a gate too) */ That sneaky gate bit! > + hw = clk_hw_register_divider_table(dev, "sdio", "hpll", 0, > + scu_base + ASPEED_CLK_SELECTION, 12, 3, 0, > + soc_data->div_table, > + &aspeed_clk_lock); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_SDIO] = hw; > + > + /* MAC AHB bus clock divider */ > + hw = clk_hw_register_divider_table(dev, "mac", "hpll", 0, > + scu_base + ASPEED_CLK_SELECTION, 16, 3, 0, > + soc_data->mac_div_table, > + &aspeed_clk_lock); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw; > + > + /* LPC Host (LHCLK) clock divider */ > + hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0, > + scu_base + ASPEED_CLK_SELECTION, 20, 3, 0, > + soc_data->div_table, > + &aspeed_clk_lock); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_LHCLK] = hw; > + > + /* Video Engine (ECLK) mux and clock divider */ > + hw = clk_hw_register_mux(dev, "eclk_mux", > + eclk_parents, ARRAY_SIZE(eclk_parents), 0, > + scu_base + ASPEED_CLK_SELECTION, 2, 2, > + 0, &aspeed_clk_lock); See my comment on the eclk_parents table above. > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_ECLK_MUX] = hw; > + hw = clk_hw_register_divider_table(dev, "eclk", "eclk_mux", 0, > + scu_base + ASPEED_CLK_SELECTION, 28, 3, 0, > + soc_data->eclk_div_table, > + &aspeed_clk_lock); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_ECLK] = hw; > + > + /* P-Bus (BCLK) clock divider */ > + hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0, > + scu_base + ASPEED_CLK_SELECTION_2, 0, 2, 0, > + soc_data->div_table, > + &aspeed_clk_lock); > + if (IS_ERR(hw)) > + return PTR_ERR(hw); > + aspeed_clk_data->hws[ASPEED_CLK_BCLK] = hw; > + > + return 0; > +}; > + > +static const struct of_device_id aspeed_clk_dt_ids[] = { > + { .compatible = "aspeed,ast2400-scu", .data = &ast2400_data }, > + { .compatible = "aspeed,ast2500-scu", .data = &ast2500_data }, > + { } > +}; > + > +static struct platform_driver aspeed_clk_driver = { > + .probe = aspeed_clk_probe, > + .driver = { > + .name = "aspeed-clk", > + .of_match_table = aspeed_clk_dt_ids, > + .suppress_bind_attrs = true, > + }, > +}; > +builtin_platform_driver(aspeed_clk_driver); > + > static void __init aspeed_ast2400_cc(struct regmap *map) > { > struct clk_hw *hw; Cheers, Andrew
diff --git a/drivers/clk/clk-aspeed.c b/drivers/clk/clk-aspeed.c index d39cf51a5114..adb295292189 100644 --- a/drivers/clk/clk-aspeed.c +++ b/drivers/clk/clk-aspeed.c @@ -14,6 +14,8 @@ #include <linux/clk-provider.h> #include <linux/mfd/syscon.h> #include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/spinlock.h> @@ -114,6 +116,32 @@ static const struct aspeed_gate_data aspeed_gates[] __initconst = { [ASPEED_CLK_GATE_LHCCLK] = { 28, -1, "lhclk-gate", "lhclk", 0 }, /* LPC master/LPC+ */ }; +static const char * const eclk_parents[] = {"d1pll", "hpll", "mpll"}; + +static const struct clk_div_table ast2500_eclk_div_table[] = { + { 0x0, 2 }, + { 0x1, 2 }, + { 0x2, 3 }, + { 0x3, 4 }, + { 0x4, 5 }, + { 0x5, 6 }, + { 0x6, 7 }, + { 0x7, 8 }, + { 0 } +}; + +static const struct clk_div_table ast2500_mac_div_table[] = { + { 0x0, 4 }, /* Yep, really. Aspeed confirmed this is correct */ + { 0x1, 4 }, + { 0x2, 6 }, + { 0x3, 8 }, + { 0x4, 10 }, + { 0x5, 12 }, + { 0x6, 14 }, + { 0x7, 16 }, + { 0 } +}; + static const struct clk_div_table ast2400_div_table[] = { { 0x0, 2 }, { 0x1, 4 }, @@ -179,6 +207,141 @@ static struct clk_hw *aspeed_ast2500_calc_pll(const char *name, u32 val) mult, div); } +struct aspeed_clk_soc_data { + const struct clk_div_table *div_table; + const struct clk_div_table *mac_div_table; + const struct clk_div_table *eclk_div_table; + struct clk_hw *(*calc_pll)(const char *name, u32 val); +}; + +static const struct aspeed_clk_soc_data ast2500_data = { + .div_table = ast2500_div_table, + .mac_div_table = ast2500_mac_div_table, + .eclk_div_table = ast2500_eclk_div_table, + .calc_pll = aspeed_ast2500_calc_pll, +}; + +static const struct aspeed_clk_soc_data ast2400_data = { + .div_table = ast2400_div_table, + .mac_div_table = ast2400_div_table, + .eclk_div_table = ast2400_div_table, + .calc_pll = aspeed_ast2400_calc_pll, +}; + +static int aspeed_clk_probe(struct platform_device *pdev) +{ + const struct aspeed_clk_soc_data *soc_data; + struct device *dev = &pdev->dev; + struct regmap *map; + struct clk_hw *hw; + u32 val, rate; + + map = syscon_node_to_regmap(dev->of_node); + if (IS_ERR(map)) { + dev_err(dev, "no syscon regmap\n"); + return PTR_ERR(map); + } + + /* SoC generations share common layouts but have different divisors */ + soc_data = of_device_get_match_data(dev); + if (!soc_data) { + dev_err(dev, "no match data for platform\n"); + return -EINVAL; + } + + /* UART clock div13 setting */ + regmap_read(map, ASPEED_MISC_CTRL, &val); + if (val & UART_DIV13_EN) + rate = 24000000 / 13; + else + rate = 24000000; + /* TODO: Find the parent data for the uart clock */ + hw = clk_hw_register_fixed_rate(dev, "uart", NULL, 0, rate); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_UART] = hw; + + /* + * Memory controller (M-PLL) PLL. This clock is configured by the + * bootloader, and is exposed to Linux as a read-only clock rate. + */ + regmap_read(map, ASPEED_MPLL_PARAM, &val); + hw = soc_data->calc_pll("mpll", val); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_MPLL] = hw; + + /* SD/SDIO clock divider (TODO: There's a gate too) */ + hw = clk_hw_register_divider_table(dev, "sdio", "hpll", 0, + scu_base + ASPEED_CLK_SELECTION, 12, 3, 0, + soc_data->div_table, + &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_SDIO] = hw; + + /* MAC AHB bus clock divider */ + hw = clk_hw_register_divider_table(dev, "mac", "hpll", 0, + scu_base + ASPEED_CLK_SELECTION, 16, 3, 0, + soc_data->mac_div_table, + &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_MAC] = hw; + + /* LPC Host (LHCLK) clock divider */ + hw = clk_hw_register_divider_table(dev, "lhclk", "hpll", 0, + scu_base + ASPEED_CLK_SELECTION, 20, 3, 0, + soc_data->div_table, + &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_LHCLK] = hw; + + /* Video Engine (ECLK) mux and clock divider */ + hw = clk_hw_register_mux(dev, "eclk_mux", + eclk_parents, ARRAY_SIZE(eclk_parents), 0, + scu_base + ASPEED_CLK_SELECTION, 2, 2, + 0, &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_ECLK_MUX] = hw; + hw = clk_hw_register_divider_table(dev, "eclk", "eclk_mux", 0, + scu_base + ASPEED_CLK_SELECTION, 28, 3, 0, + soc_data->eclk_div_table, + &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_ECLK] = hw; + + /* P-Bus (BCLK) clock divider */ + hw = clk_hw_register_divider_table(dev, "bclk", "hpll", 0, + scu_base + ASPEED_CLK_SELECTION_2, 0, 2, 0, + soc_data->div_table, + &aspeed_clk_lock); + if (IS_ERR(hw)) + return PTR_ERR(hw); + aspeed_clk_data->hws[ASPEED_CLK_BCLK] = hw; + + return 0; +}; + +static const struct of_device_id aspeed_clk_dt_ids[] = { + { .compatible = "aspeed,ast2400-scu", .data = &ast2400_data }, + { .compatible = "aspeed,ast2500-scu", .data = &ast2500_data }, + { } +}; + +static struct platform_driver aspeed_clk_driver = { + .probe = aspeed_clk_probe, + .driver = { + .name = "aspeed-clk", + .of_match_table = aspeed_clk_dt_ids, + .suppress_bind_attrs = true, + }, +}; +builtin_platform_driver(aspeed_clk_driver); + static void __init aspeed_ast2400_cc(struct regmap *map) { struct clk_hw *hw;