On 7.5.2018 03:20, James Kelly wrote:
> The CCF clock providers that are currently used by the driver are not
> capable of supporting the Clocking Wizard IP register interface for
> fractional ratios, nor are they able to enforce constraints require to
> ensure the PLL will always lock.
>
> None of the common CCF clock providers seem to be a good fit so we
> implement a new CCF clock provider within the driver that can be expanded
> upon in subsequent patches. The initial implementation supports multiply
> or divide by fixed integer ratios.
>
> The CCF clock provider uses:
> - devm kernel APIs for clock registration to simplify error recovery and
> module unloading.
> - regmap kernel APIs for memory mapped I/O. Regmap is also able to manage
> prepare/enable/disable/unprepare of the AXI clock for us.
>
> Note that use of the new CCF clock provider is deferred to a subsequent
> patch.
>
> Signed-off-by: James Kelly <jamespeterke...@gmail.com>
> ---
> .../clocking-wizard/clk-xlnx-clock-wizard.c | 164
> +++++++++++++++++++++
> 1 file changed, 164 insertions(+)
>
> diff --git a/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> b/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> index 3b66ac3b5ed0..ba9b1dc93d50 100644
> --- a/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> +++ b/drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c
> @@ -3,6 +3,7 @@
> * Xilinx 'Clocking Wizard' driver
> *
> * Copyright (C) 2013 - 2014 Xilinx
> + * Copyright (C) 2018 James Kelly
> *
> * Sören Brinkmann <soren.brinkm...@xilinx.com>
> *
> @@ -67,11 +68,13 @@
> #include <linux/of.h>
> #include <linux/module.h>
> #include <linux/err.h>
> +#include <linux/regmap.h>
>
> #define WZRD_NUM_OUTPUTS 7
> #define WZRD_ACLK_MAX_FREQ 250000000UL
> #define WZRD_CLKNAME_AXI "s_axi_aclk"
> #define WZRD_CLKNAME_IN1 "clk_in1"
> +#define WZRD_FLAG_MULTIPLY BIT(0)
>
> #define WZRD_CLK_CFG_REG(n) (0x200 + 4 * (n))
>
> @@ -91,28 +94,90 @@ enum clk_wzrd_int_clks {
> wzrd_clk_int_max
> };
>
> +enum clk_wzrd_clk {
> + WZRD_CLK_DIV,
> + WZRD_CLK_PLL,
> + WZRD_CLK_OUT,
> + WZRD_CLK_COUNT
> +};
> +
> +/*
> + * Register map extracted from Xilinx document listed below.
> + *
> + * PG065 Clocking Wizard v6.0 LogiCORE IP Product Guide
> + */
> +static const struct regmap_config clk_wzrd_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32
> +};
> +
> +static const struct reg_field clk_wzrd_status_locked = REG_FIELD(0x004, 0,
> 0);
> +static const struct reg_field clk_wzrd_divclk_divide = REG_FIELD(0x200, 0,
> 7);
> +static const struct reg_field clk_wzrd_clkfbout_mult = REG_FIELD(0x200, 8,
> 15);
> +static const struct reg_field clk_wzrd_clkfbout_frac = REG_FIELD(0x200, 16,
> 25);
> +static const struct reg_field clk_wzrd_clkout_divide[WZRD_NUM_OUTPUTS] = {
> + REG_FIELD(0x208, 0, 7),
> + REG_FIELD(0x214, 0, 7),
> + REG_FIELD(0x220, 0, 7),
> + REG_FIELD(0x22C, 0, 7),
> + REG_FIELD(0x238, 0, 7),
> + REG_FIELD(0x244, 0, 7),
> + REG_FIELD(0x250, 0, 7)
> +};
> +
> +static const struct reg_field clk_wzrd_clkout0_frac = REG_FIELD(0x208, 8,
> 17);
> +static const struct reg_field clk_wzrd_reconfig = REG_FIELD(0x25C, 0,
> 1);
> +
> +/**
> + * struct clk_wzrd_clk_data - Clocking Wizard component clock provider data
> + *
> + * @hw: handle between common and hardware-specific
> interfaces
> + * @flags: hardware specific flags
> + * @int_field: pointer to regmap field for integer part
> + *
> + * Flags:
> + * WZRD_FLAG_MULTIPLY Clock is a multiplier rather than a divider
> + */
> +struct clk_wzrd_clk_data {
> + struct clk_hw hw;
> + unsigned long flags;
> + struct regmap_field *int_field;
> +};
> +
> +#define to_clk_wzrd_clk_data(_hw) \
> + container_of(_hw, struct clk_wzrd_clk_data, hw)
> +
> /**
> * struct clk_wzrd:
> * @clk_data: Clock data
> * @nb: Notifier block
> * @base: Memory base
> + * @regmap: Register map for hardware
> * @clk_in1: Handle to input clock 'clk_in1'
> * @axi_clk: Handle to input clock 's_axi_aclk'
> * @clks_internal: Internal clocks
> * @clkout: Output clocks
> * @speed_grade: Speed grade of the device
> * @suspended: Flag indicating power state of the device
> + * @div: Divider internal clock provider data
> + * @pll: Phase locked loop internal clock provider data
> + * @clkout_data: Array of output clock provider data
> */
> struct clk_wzrd {
> struct clk_onecell_data clk_data;
> struct notifier_block nb;
> void __iomem *base;
> + struct regmap *regmap;
> struct clk *clk_in1;
> struct clk *axi_clk;
> struct clk *clks_internal[wzrd_clk_int_max];
> struct clk *clkout[WZRD_NUM_OUTPUTS];
> unsigned int speed_grade;
> bool suspended;
> + struct clk_wzrd_clk_data div_data;
> + struct clk_wzrd_clk_data pll_data;
Names don't fit with what it is added to kernel-doc above.
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:152: info:
Scanning doc for struct
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:181: warning:
Function parameter or member 'div_data' not described in 'clk_wzrd'
drivers/staging/clocking-wizard/clk-xlnx-clock-wizard.c:181: warning:
Function parameter or member 'pll_data' not described in 'clk_wzrd'
Anyway. Shubhrajyoti is going to test this series that's why please give
us some time for it.
Thanks,
Michal
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