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linux/drivers/clk/mxs/clk-imx23.c

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clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup It really becomes a maintenance issue that every time a device needs to look up (clk_get) a clock we have to patch kernel clock file to call clk_register_clkdev for that clock. Since clock DT support which is meant to resolve clock lookup in device tree is in place, the patch moves imx23 client devices' clock lookup over to device tree, so that any new lookup to be added at later time can just get done in DT instead of kernel. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-08-22 13:36:30 +00:00
#include <linux/of.h>
clk: mxs: get base address from device tree Instead of using the static definitions, get clkctrl and digctl base addresses with mapping from device tree. Use macro on variable is not nice, but it's done here to save huge pointless diff stat. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:11:02 +00:00
#include <linux/of_address.h>
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
#include "clk.h"
clk: mxs: get base address from device tree Instead of using the static definitions, get clkctrl and digctl base addresses with mapping from device tree. Use macro on variable is not nice, but it's done here to save huge pointless diff stat. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:11:02 +00:00
static void __iomem *clkctrl;
static void __iomem *digctrl;
#define CLKCTRL clkctrl
#define DIGCTRL digctrl
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
#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 */
clk: mxs: remove the use of mach level IO accessor It removes the use of mach level IO accessor __mxs_setl/clrl, and hence removes mach header inclusion from clock driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:22:55 +00:00
writel_relaxed(1 << BP_CPU_INTERRUPT_WAIT, CPU + SET);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
/* Clear BYPASS for SAIF */
clk: mxs: remove the use of mach level IO accessor It removes the use of mach level IO accessor __mxs_setl/clrl, and hence removes mach header inclusion from clock driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:22:55 +00:00
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SAIF, CLKSEQ + CLR);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
/* 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.
*/
clk: mxs: remove the use of mach level IO accessor It removes the use of mach level IO accessor __mxs_setl/clrl, and hence removes mach header inclusion from clock driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:22:55 +00:00
writel_relaxed(1 << BP_CLKSEQ_BYPASS_SSP, CLKSEQ + CLR);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
/*
* 480 MHz seems too high to be ssp clock source directly,
* so set frac to get a 288 MHz ref_io.
*/
clk: mxs: remove the use of mach level IO accessor It removes the use of mach level IO accessor __mxs_setl/clrl, and hence removes mach header inclusion from clock driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:22:55 +00:00
writel_relaxed(0x3f << BP_FRAC_IOFRAC, FRAC + CLR);
writel_relaxed(30 << BP_FRAC_IOFRAC, FRAC + SET);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
}
static const char *sel_pll[] __initconst = { "pll", "ref_xtal", };
static const char *sel_cpu[] __initconst = { "ref_cpu", "ref_xtal", };
static const char *sel_pix[] __initconst = { "ref_pix", "ref_xtal", };
static const char *sel_io[] __initconst = { "ref_io", "ref_xtal", };
static const char *cpu_sels[] __initconst = { "cpu_pll", "cpu_xtal", };
static const char *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,
clk: mxs: Use a better name for the USB PHY clock Use a better name for the USB PHY clock. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2012-09-22 16:54:55 +00:00
lcdif, etm, usb, usb_phy,
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
clk_max
};
static struct clk *clks[clk_max];
clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup It really becomes a maintenance issue that every time a device needs to look up (clk_get) a clock we have to patch kernel clock file to call clk_register_clkdev for that clock. Since clock DT support which is meant to resolve clock lookup in device tree is in place, the patch moves imx23 client devices' clock lookup over to device tree, so that any new lookup to be added at later time can just get done in DT instead of kernel. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-08-22 13:36:30 +00:00
static struct clk_onecell_data clk_data;
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
static enum imx23_clk clks_init_on[] __initdata = {
cpu, hbus, xbus, emi, uart,
};
int __init mx23_clocks_init(void)
{
clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup It really becomes a maintenance issue that every time a device needs to look up (clk_get) a clock we have to patch kernel clock file to call clk_register_clkdev for that clock. Since clock DT support which is meant to resolve clock lookup in device tree is in place, the patch moves imx23 client devices' clock lookup over to device tree, so that any new lookup to be added at later time can just get done in DT instead of kernel. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-08-22 13:36:30 +00:00
struct device_node *np;
clk: mxs: Index is always positive Fix the following warnings when building with W=1 option: drivers/clk/mxs/clk-imx23.c: In function 'mx23_clocks_init': drivers/clk/mxs/clk-imx23.c:149:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] drivers/clk/mxs/clk-imx23.c:165:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] ... drivers/clk/mxs/clk-imx28.c: In function 'mx28_clocks_init': drivers/clk/mxs/clk-imx28.c:227:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] drivers/clk/mxs/clk-imx28.c:244:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Acked-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2013-01-08 01:38:55 +00:00
u32 i;
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
clk: mxs: get base address from device tree Instead of using the static definitions, get clkctrl and digctl base addresses with mapping from device tree. Use macro on variable is not nice, but it's done here to save huge pointless diff stat. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:11:02 +00:00
np = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl");
digctrl = of_iomap(np, 0);
WARN_ON(!digctrl);
np = of_find_compatible_node(NULL, NULL, "fsl,imx23-clkctrl");
clkctrl = of_iomap(np, 0);
WARN_ON(!clkctrl);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
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);
clk: mxs: Use a better name for the USB PHY clock Use a better name for the USB PHY clock. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Mike Turquette <mturquette@linaro.org>
2012-09-22 16:54:55 +00:00
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);
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
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 PTR_ERR(clks[i]);
}
clk: mxs: get base address from device tree Instead of using the static definitions, get clkctrl and digctl base addresses with mapping from device tree. Use macro on variable is not nice, but it's done here to save huge pointless diff stat. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Acked-by: Mike Turquette <mturquette@linaro.org>
2013-03-26 13:11:02 +00:00
clk_data.clks = clks;
clk_data.clk_num = ARRAY_SIZE(clks);
of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
clk: mxs: replace imx23 clk_register_clkdev with clock DT lookup It really becomes a maintenance issue that every time a device needs to look up (clk_get) a clock we have to patch kernel clock file to call clk_register_clkdev for that clock. Since clock DT support which is meant to resolve clock lookup in device tree is in place, the patch moves imx23 client devices' clock lookup over to device tree, so that any new lookup to be added at later time can just get done in DT instead of kernel. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-08-22 13:36:30 +00:00
clk: mxs: add clock support for imx23 Add imx23 clock support based on common clk framework. Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-04-28 16:02:35 +00:00
for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
clk_prepare_enable(clks[clks_init_on[i]]);
return 0;
}
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