Commit c1120542 authored by Michal Simek's avatar Michal Simek
Browse files

microblaze: Add support for CCF 



Add support for CCF for Microblaze.

Old binding:
system_timer: system-timer@41c00000 {
	clock-frequency = <75000000>;
	...
}

New binding:
system_timer: system-timer@41c00000 {
	clocks = <&clk_bus>;
	...
}

Both should be supported for a while

Microblaze clock binding:
clocks {
	#address-cells = <1>;
	#size-cells = <0>;
	clk_bus: bus {
		#clock-cells = <0>;
		clock-frequency = <75000000>;
		clock-output-names = "bus";
		compatible = "fixed-clock";
		reg = <1>;
	} ;
	clk_cpu: cpu {
		#clock-cells = <0>;
		clock-frequency = <75000000>;
		clock-output-names = "cpu";
		compatible = "fixed-clock";
		reg = <0>;
	} ;
} ;

Signed-off-by: default avatarMichal Simek <michal.simek@xilinx.com>
parent 21ecc1f1

arch/microblaze/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ config MICROBLAZE 
	select GENERIC_CPU_DEVICES

	select GENERIC_ATOMIC64

	select GENERIC_CLOCKEVENTS

	select COMMON_CLK

	select GENERIC_IDLE_POLL_SETUP

	select MODULES_USE_ELF_RELA

	select CLONE_BACKWARDS3

arch/microblaze/include/asm/cpuinfo.h

+1 −0
Original line number Diff line number Diff line
@@ -91,6 +91,7 @@ extern struct cpuinfo cpuinfo; 


/* fwd declarations of the various CPUinfo populators */

void setup_cpuinfo(void);

void setup_cpuinfo_clk(void);



void set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu);

void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu);

arch/microblaze/kernel/cpu/cpuinfo-pvr-full.c

+0 −3
Original line number Diff line number Diff line
@@ -112,7 +112,4 @@ void set_cpuinfo_pvr_full(struct cpuinfo *ci, struct device_node *cpu) 
	CI(num_wr_brk, NUMBER_OF_WR_ADDR_BRK);



	CI(fpga_family_code, TARGET_FAMILY);



	/* take timebase-frequency from DTS */

	ci->cpu_clock_freq = fcpu(cpu, "timebase-frequency");

}

arch/microblaze/kernel/cpu/cpuinfo-static.c

+0 −2
Original line number Diff line number Diff line
@@ -113,8 +113,6 @@ void __init set_cpuinfo_static(struct cpuinfo *ci, struct device_node *cpu) 
	ci->num_rd_brk = fcpu(cpu, "xlnx,number-of-rd-addr-brk");

	ci->num_wr_brk = fcpu(cpu, "xlnx,number-of-wr-addr-brk");



	ci->cpu_clock_freq = fcpu(cpu, "timebase-frequency");



	ci->pvr_user1 = fcpu(cpu, "xlnx,pvr-user1");

	ci->pvr_user2 = fcpu(cpu, "xlnx,pvr-user2");

arch/microblaze/kernel/cpu/cpuinfo.c

+21 −2
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 * for more details.

 */



#include <linux/clk.h>

#include <linux/init.h>

#include <asm/cpuinfo.h>

#include <asm/pvr.h>
@@ -68,11 +69,10 @@ const struct family_string_key family_string_lookup[] = { 
};



struct cpuinfo cpuinfo;

static struct device_node *cpu;



void __init setup_cpuinfo(void)

{

	struct device_node *cpu = NULL;



	cpu = (struct device_node *) of_find_node_by_type(NULL, "cpu");

	if (!cpu)

		pr_err("You don't have cpu!!!\n");
@@ -102,3 +102,22 @@ void __init setup_cpuinfo(void) 
		pr_warn("%s: Stream instructions enabled"

			" - USERSPACE CAN LOCK THIS KERNEL!\n", __func__);

}



void __init setup_cpuinfo_clk(void)

{

	struct clk *clk;



	clk = of_clk_get(cpu, 0);

	if (IS_ERR(clk)) {

		pr_err("ERROR: CPU CCF input clock not found\n");

		/* take timebase-frequency from DTS */

		cpuinfo.cpu_clock_freq = fcpu(cpu, "timebase-frequency");

	} else {

		cpuinfo.cpu_clock_freq = clk_get_rate(clk);

	}



	if (!cpuinfo.cpu_clock_freq) {

		pr_err("ERROR: CPU clock frequency not setup\n");

		BUG();

	}

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE