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realtek: more generic platform initialization

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Platform startup still "guesses" the CPU clock speed by DT fixed values.
If possible take clock rates from a to be developed driver and align to
MIPS generic platfom initialization code. Pack old behaviour into a
fallback function. We might get rid of that some day.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
This commit is contained in:
Markus Stockhausen 2022-08-19 21:08:42 +02:00 committed by Sander Vanheule
parent 8c04a5c456
commit 396e190f0b
1 changed files with 34 additions and 5 deletions
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39
target/linux/realtek/files-5.10/arch/mips/rtl838x/setup.c
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@ -13,6 +13,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/clkdev.h> #include <linux/clkdev.h>
#include <linux/clk-provider.h> #include <linux/clk-provider.h>
#include <linux/clk.h>
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/of_fdt.h> #include <linux/of_fdt.h>
#include <linux/irqchip.h> #include <linux/irqchip.h>
@ -48,14 +49,11 @@ void __init plat_mem_setup(void)
__dt_setup_arch(dtb); __dt_setup_arch(dtb);
} }
void __init plat_time_init(void) void plat_time_init_fallback(void)
{ {
struct device_node *np; struct device_node *np;
u32 freq = 500000000; u32 freq = 500000000;
of_clk_init(NULL);
timer_probe();
np = of_find_node_by_name(NULL, "cpus"); np = of_find_node_by_name(NULL, "cpus");
if (!np) { if (!np) {
pr_err("Missing 'cpus' DT node, using default frequency."); pr_err("Missing 'cpus' DT node, using default frequency.");
@ -66,10 +64,41 @@ void __init plat_time_init(void)
pr_info("CPU frequency from device tree: %dMHz", freq / 1000000); pr_info("CPU frequency from device tree: %dMHz", freq / 1000000);
of_node_put(np); of_node_put(np);
} }
mips_hpt_frequency = freq / 2; mips_hpt_frequency = freq / 2;
} }
void __init plat_time_init(void)
{
/*
* Initialization routine resembles generic MIPS plat_time_init() with
* lazy error handling. The final fallback is only needed until we have
* converted all device trees to new clock syntax.
*/
struct device_node *np;
struct clk *clk;
of_clk_init(NULL);
mips_hpt_frequency = 0;
np = of_get_cpu_node(0, NULL);
if (!np) {
pr_err("Failed to get CPU node\n");
} else {
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
} else {
mips_hpt_frequency = clk_get_rate(clk) / 2;
clk_put(clk);
}
}
if (!mips_hpt_frequency)
plat_time_init_fallback();
timer_probe();
}
void __init arch_init_irq(void) void __init arch_init_irq(void)
{ {
irqchip_init(); irqchip_init();