// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*/
#include <linux/clk/mxs.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include "clk.h"
static void __iomem *clkctrl;
static void __iomem *digctrl;
#define CLKCTRL clkctrl
#define DIGCTRL digctrl
#define PLLCTRL0 (CLKCTRL + 0x0000)
#define CPU (CLKCTRL + 0x0020)
#define HBUS (CLKCTRL + 0x0030)
#define XBUS (CLKCTRL + 0x0040)
#define XTAL (CLKCTRL + 0x0050)
#define PIX (CLKCTRL + 0x0060)
#define SSP (CLKCTRL + 0x0070)
#define GPMI (CLKCTRL + 0x0080)
#define SPDIF (CLKCTRL + 0x0090)
#define EMI (CLKCTRL + 0x00a0)
#define SAIF (CLKCTRL + 0x00c0)
#define TV (CLKCTRL + 0x00d0)
#define ETM (CLKCTRL + 0x00e0)
#define FRAC (CLKCTRL + 0x00f0)
#define CLKSEQ (CLKCTRL + 0x0110)
#define BP_CPU_INTERRUPT_WAIT 12
#define BP_CLKSEQ_BYPASS_SAIF 0
#define BP_CLKSEQ_BYPASS_SSP 5
#define BP_SAIF_DIV_FRAC_EN 16
#define BP_FRAC_IOFRAC 24
static void __init clk_misc_init(void )
{
u32 val;
/* Gate off cpu clock in WFI for power saving */
writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET);
/* Clear BYPASS for SAIF */
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SAIF, CLKSEQ + CLR);
/* SAIF has to use frac div for functional operation */
val = readl_relaxed(SAIF);
val |= 1 << BP_SAIF_DIV_FRAC_EN;
writel_relaxed(val, SAIF);
/*
* Source ssp clock from ref_io than ref_xtal,
* as ref_xtal only provides 24 MHz as maximum.
*/
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SSP, CLKSEQ + CLR);
/*
* 480 MHz seems too high to be ssp clock source directly,
* so set frac to get a 288 MHz ref_io.
*/
writel_relaxed(0x3f << BP_FRAC_IOFRAC, FRAC + CLR);
writel_relaxed(30 << BP_FRAC_IOFRAC, FRAC + SET);
}
static const char *const sel_pll[] __initconst = { "pll" , "ref_xtal" , };
static const char *const sel_cpu[] __initconst = { "ref_cpu" , "ref_xtal" , };
static const char *const sel_pix[] __initconst = { "ref_pix" , "ref_xtal" , };
static const char *const sel_io[] __initconst = { "ref_io" , "ref_xtal" , };
static const char *const cpu_sels[] __initconst = { "cpu_pll" , "cpu_xtal" , };
static const char *const emi_sels[] __initconst = { "emi_pll" , "emi_xtal" , };
enum imx23_clk {
ref_xtal, pll, ref_cpu, ref_emi, ref_pix, ref_io, saif_sel,
lcdif_sel, gpmi_sel, ssp_sel, emi_sel, cpu, etm_sel, cpu_pll,
cpu_xtal, hbus, xbus, lcdif_div, ssp_div, gpmi_div, emi_pll,
emi_xtal, etm_div, saif_div, clk32k_div, rtc, adc, spdif_div,
clk32k, dri, pwm, filt, uart, ssp, gpmi, spdif, emi, saif,
lcdif, etm, usb, usb_phy,
clk_max
};
static struct clk *clks[clk_max];
static struct clk_onecell_data clk_data;
static enum imx23_clk clks_init_on[] __initdata = {
cpu, hbus, xbus, emi, uart,
};
static void __init mx23_clocks_init(struct device_node *np)
{
struct device_node *dcnp;
u32 i;
dcnp = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl" );
digctrl = of_iomap(dcnp, 0);
WARN_ON(!digctrl);
of_node_put(dcnp);
clkctrl = of_iomap(np, 0);
WARN_ON(!clkctrl);
clk_misc_init();
clks[ref_xtal] = mxs_clk_fixed("ref_xtal" , 24000000);
clks[pll] = mxs_clk_pll("pll" , "ref_xtal" , PLLCTRL0, 16, 480000000);
clks[ref_cpu] = mxs_clk_ref("ref_cpu" , "pll" , FRAC, 0);
clks[ref_emi] = mxs_clk_ref("ref_emi" , "pll" , FRAC, 1);
clks[ref_pix] = mxs_clk_ref("ref_pix" , "pll" , FRAC, 2);
clks[ref_io] = mxs_clk_ref("ref_io" , "pll" , FRAC, 3);
clks[saif_sel] = mxs_clk_mux("saif_sel" , CLKSEQ, 0, 1, sel_pll, ARRAY_SIZE(sel_pll));
clks[lcdif_sel] = mxs_clk_mux("lcdif_sel" , CLKSEQ, 1, 1, sel_pix, ARRAY_SIZE(sel_pix));
clks[gpmi_sel] = mxs_clk_mux("gpmi_sel" , CLKSEQ, 4, 1, sel_io, ARRAY_SIZE(sel_io));
clks[ssp_sel] = mxs_clk_mux("ssp_sel" , CLKSEQ, 5, 1, sel_io, ARRAY_SIZE(sel_io));
clks[emi_sel] = mxs_clk_mux("emi_sel" , CLKSEQ, 6, 1, emi_sels, ARRAY_SIZE(emi_sels));
clks[cpu] = mxs_clk_mux("cpu" , CLKSEQ, 7, 1, cpu_sels, ARRAY_SIZE(cpu_sels));
clks[etm_sel] = mxs_clk_mux("etm_sel" , CLKSEQ, 8, 1, sel_cpu, ARRAY_SIZE(sel_cpu));
clks[cpu_pll] = mxs_clk_div("cpu_pll" , "ref_cpu" , CPU, 0, 6, 28);
clks[cpu_xtal] = mxs_clk_div("cpu_xtal" , "ref_xtal" , CPU, 16, 10, 29);
clks[hbus] = mxs_clk_div("hbus" , "cpu" , HBUS, 0, 5, 29);
clks[xbus] = mxs_clk_div("xbus" , "ref_xtal" , XBUS, 0, 10, 31);
clks[lcdif_div] = mxs_clk_div("lcdif_div" , "lcdif_sel" , PIX, 0, 12, 29);
clks[ssp_div] = mxs_clk_div("ssp_div" , "ssp_sel" , SSP, 0, 9, 29);
clks[gpmi_div] = mxs_clk_div("gpmi_div" , "gpmi_sel" , GPMI, 0, 10, 29);
clks[emi_pll] = mxs_clk_div("emi_pll" , "ref_emi" , EMI, 0, 6, 28);
clks[emi_xtal] = mxs_clk_div("emi_xtal" , "ref_xtal" , EMI, 8, 4, 29);
clks[etm_div] = mxs_clk_div("etm_div" , "etm_sel" , ETM, 0, 6, 29);
clks[saif_div] = mxs_clk_frac("saif_div" , "saif_sel" , SAIF, 0, 16, 29);
clks[clk32k_div] = mxs_clk_fixed_factor("clk32k_div" , "ref_xtal" , 1, 750);
clks[rtc] = mxs_clk_fixed_factor("rtc" , "ref_xtal" , 1, 768);
clks[adc] = mxs_clk_fixed_factor("adc" , "clk32k" , 1, 16);
clks[spdif_div] = mxs_clk_fixed_factor("spdif_div" , "pll" , 1, 4);
clks[clk32k] = mxs_clk_gate("clk32k" , "clk32k_div" , XTAL, 26);
clks[dri] = mxs_clk_gate("dri" , "ref_xtal" , XTAL, 28);
clks[pwm] = mxs_clk_gate("pwm" , "ref_xtal" , XTAL, 29);
clks[filt] = mxs_clk_gate("filt" , "ref_xtal" , XTAL, 30);
clks[uart] = mxs_clk_gate("uart" , "ref_xtal" , XTAL, 31);
clks[ssp] = mxs_clk_gate("ssp" , "ssp_div" , SSP, 31);
clks[gpmi] = mxs_clk_gate("gpmi" , "gpmi_div" , GPMI, 31);
clks[spdif] = mxs_clk_gate("spdif" , "spdif_div" , SPDIF, 31);
clks[emi] = mxs_clk_gate("emi" , "emi_sel" , EMI, 31);
clks[saif] = mxs_clk_gate("saif" , "saif_div" , SAIF, 31);
clks[lcdif] = mxs_clk_gate("lcdif" , "lcdif_div" , PIX, 31);
clks[etm] = mxs_clk_gate("etm" , "etm_div" , ETM, 31);
clks[usb] = mxs_clk_gate("usb" , "usb_phy" , DIGCTRL, 2);
clks[usb_phy] = clk_register_gate(NULL, "usb_phy" , "pll" , 0, PLLCTRL0, 18, 0, &mxs_lock);
for (i = 0; i < ARRAY_SIZE(clks); i++)
if (IS_ERR(clks[i])) {
pr_err("i.MX23 clk %d: register failed with %ld\n" ,
i, PTR_ERR(clks[i]));
return ;
}
clk_data.clks = clks;
clk_data.clk_num = ARRAY_SIZE(clks);
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
clk_prepare_enable(clks[clks_init_on[i]]);
}
CLK_OF_DECLARE(imx23_clkctrl, "fsl,imx23-clkctrl" , mx23_clocks_init);
Messung V0.5 C=96 H=92 G=93
¤ Dauer der Verarbeitung: 0.13 Sekunden
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