mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-13 23:34:05 +08:00
ed12dfc92f
Provide support for Sigma Designs Tango4 clock generator. NOTE: This driver is incompatible with Tango3 clkgen. Signed-off-by: Marc Gonzalez <marc_gonzalez@sigmadesigns.com> [sboyd@codeaurora.org: Add kernel.h include for panic/sprintf] Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
|
|
static struct clk *out[2];
|
|
static struct clk_onecell_data clk_data = { out, 2 };
|
|
|
|
#define SYSCLK_CTRL 0x20
|
|
#define CPUCLK_CTRL 0x24
|
|
#define LEGACY_DIV 0x3c
|
|
|
|
#define PLL_N(val) (((val) >> 0) & 0x7f)
|
|
#define PLL_K(val) (((val) >> 13) & 0x7)
|
|
#define PLL_M(val) (((val) >> 16) & 0x7)
|
|
#define DIV_INDEX(val) (((val) >> 8) & 0xf)
|
|
|
|
static void __init make_pll(int idx, const char *parent, void __iomem *base)
|
|
{
|
|
char name[8];
|
|
u32 val, mul, div;
|
|
|
|
sprintf(name, "pll%d", idx);
|
|
val = readl_relaxed(base + idx*8);
|
|
mul = PLL_N(val) + 1;
|
|
div = (PLL_M(val) + 1) << PLL_K(val);
|
|
clk_register_fixed_factor(NULL, name, parent, 0, mul, div);
|
|
}
|
|
|
|
static int __init get_div(void __iomem *base)
|
|
{
|
|
u8 sysclk_tab[16] = { 2, 4, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4 };
|
|
int idx = DIV_INDEX(readl_relaxed(base + LEGACY_DIV));
|
|
|
|
return sysclk_tab[idx];
|
|
}
|
|
|
|
static void __init tango4_clkgen_setup(struct device_node *np)
|
|
{
|
|
int div, ret;
|
|
void __iomem *base = of_iomap(np, 0);
|
|
const char *parent = of_clk_get_parent_name(np, 0);
|
|
|
|
if (!base)
|
|
panic("%s: invalid address\n", np->full_name);
|
|
|
|
make_pll(0, parent, base);
|
|
make_pll(1, parent, base);
|
|
|
|
out[0] = clk_register_divider(NULL, "cpuclk", "pll0", 0,
|
|
base + CPUCLK_CTRL, 8, 8, CLK_DIVIDER_ONE_BASED, NULL);
|
|
|
|
div = readl_relaxed(base + SYSCLK_CTRL) & BIT(23) ? get_div(base) : 4;
|
|
out[1] = clk_register_fixed_factor(NULL, "sysclk", "pll1", 0, 1, div);
|
|
|
|
ret = of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
|
|
if (IS_ERR(out[0]) || IS_ERR(out[1]) || ret < 0)
|
|
panic("%s: clk registration failed\n", np->full_name);
|
|
}
|
|
CLK_OF_DECLARE(tango4_clkgen, "sigma,tango4-clkgen", tango4_clkgen_setup);
|