diff options
Diffstat (limited to 'drivers/clk/imx/clk-scu.c')
| -rw-r--r-- | drivers/clk/imx/clk-scu.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c index f460526a7abb..fbef740704d0 100644 --- a/drivers/clk/imx/clk-scu.c +++ b/drivers/clk/imx/clk-scu.c @@ -4,12 +4,17 @@ * Dong Aisheng <aisheng.dong@nxp.com> */ +#include <dt-bindings/firmware/imx/rsrc.h> +#include <linux/arm-smccc.h> #include <linux/clk-provider.h> #include <linux/err.h> #include <linux/slab.h> #include "clk-scu.h" +#define IMX_SIP_CPUFREQ 0xC2000001 +#define IMX_SIP_SET_CPUFREQ 0x00 + static struct imx_sc_ipc *ccm_ipc_handle; /* @@ -180,6 +185,25 @@ static long clk_scu_round_rate(struct clk_hw *hw, unsigned long rate, return rate; } +static int clk_scu_atf_set_cpu_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_scu *clk = to_clk_scu(hw); + struct arm_smccc_res res; + unsigned long cluster_id; + + if (clk->rsrc_id == IMX_SC_R_A35) + cluster_id = 0; + else + return -EINVAL; + + /* CPU frequency scaling can ONLY be done by ARM-Trusted-Firmware */ + arm_smccc_smc(IMX_SIP_CPUFREQ, IMX_SIP_SET_CPUFREQ, + cluster_id, rate, 0, 0, 0, 0, &res); + + return 0; +} + /* * clk_scu_set_rate - Set rate for a SCU clock * @hw: clock to change rate for @@ -312,6 +336,14 @@ static const struct clk_ops clk_scu_ops = { .unprepare = clk_scu_unprepare, }; +static const struct clk_ops clk_scu_cpu_ops = { + .recalc_rate = clk_scu_recalc_rate, + .round_rate = clk_scu_round_rate, + .set_rate = clk_scu_atf_set_cpu_rate, + .prepare = clk_scu_prepare, + .unprepare = clk_scu_unprepare, +}; + struct clk_hw *__imx_clk_scu(const char *name, const char * const *parents, int num_parents, u32 rsrc_id, u8 clk_type) { @@ -329,6 +361,10 @@ struct clk_hw *__imx_clk_scu(const char *name, const char * const *parents, init.name = name; init.ops = &clk_scu_ops; + if (rsrc_id == IMX_SC_R_A35) + init.ops = &clk_scu_cpu_ops; + else + init.ops = &clk_scu_ops; init.parent_names = parents; init.num_parents = num_parents; |