Re: [PATCH v5 0/4] common clk framework
From: Sascha Hauer
Date: Fri Mar 09 2012 - 04:19:44 EST
Hi Richard,
On Fri, Mar 09, 2012 at 10:34:19AM +0800, Richard Zhao wrote:
> Hello Mike,
>
> The main interface for clk implementer is to register clocks dynamically.
> I think it highly depends on clk DT bindings. From the patch Grant sent
> out, it looks like he doesn't like one node per clk. So how do we
> register clocks dynamically? You have any sample code?
Find my current work based on this series here:
git://git.pengutronix.de/git/imx/linux-2.6.git work/imx-clkv5
This implements the generic clock support for the i.MX v4/v5 based
SoCs. i.MX1 and i.MX27 are runtime tested, i.MX21/25 are compile
tested only.
A typical clock file will then look like this, here the i.MX27
implementation:
8<-------------------------------------------------------
ARM i.MX27: implement clocks using common clock framework
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/mach-imx/Makefile | 2 +-
arch/arm/mach-imx/clk-imx27.c | 227 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 228 insertions(+), 1 deletions(-)
create mode 100644 arch/arm/mach-imx/clk-imx27.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index d96e2ce..b39f2d6 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_SOC_IMX21) += clk-imx21.o mm-imx21.o
obj-$(CONFIG_SOC_IMX25) += clk-imx25.o mm-imx25.o ehci-imx25.o cpu-imx25.o
obj-$(CONFIG_SOC_IMX27) += cpu-imx27.o pm-imx27.o
-obj-$(CONFIG_SOC_IMX27) += clock-imx27.o mm-imx27.o ehci-imx27.o
+obj-$(CONFIG_SOC_IMX27) += clk-imx27.o mm-imx27.o ehci-imx27.o
obj-$(CONFIG_SOC_IMX31) += mm-imx3.o cpu-imx31.o clock-imx31.o iomux-imx31.o ehci-imx31.o
obj-$(CONFIG_SOC_IMX35) += mm-imx3.o cpu-imx35.o clock-imx35.o ehci-imx35.o
diff --git a/arch/arm/mach-imx/clk-imx27.c b/arch/arm/mach-imx/clk-imx27.c
new file mode 100644
index 0000000..f54e4ee
--- /dev/null
+++ b/arch/arm/mach-imx/clk-imx27.c
@@ -0,0 +1,227 @@
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/clkdev.h>
+#include <linux/clk-provider.h>
+
+#include <asm/div64.h>
+
+#include <mach/common.h>
+#include <mach/hardware.h>
+#include "clk.h"
+
+#define IO_ADDR_CCM(off) (MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR + (off)))
+
+/* Register offsets */
+#define CCM_CSCR IO_ADDR_CCM(0x0)
+#define CCM_MPCTL0 IO_ADDR_CCM(0x4)
+#define CCM_MPCTL1 IO_ADDR_CCM(0x8)
+#define CCM_SPCTL0 IO_ADDR_CCM(0xc)
+#define CCM_SPCTL1 IO_ADDR_CCM(0x10)
+#define CCM_OSC26MCTL IO_ADDR_CCM(0x14)
+#define CCM_PCDR0 IO_ADDR_CCM(0x18)
+#define CCM_PCDR1 IO_ADDR_CCM(0x1c)
+#define CCM_PCCR0 IO_ADDR_CCM(0x20)
+#define CCM_PCCR1 IO_ADDR_CCM(0x24)
+#define CCM_CCSR IO_ADDR_CCM(0x28)
+#define CCM_PMCTL IO_ADDR_CCM(0x2c)
+#define CCM_PMCOUNT IO_ADDR_CCM(0x30)
+#define CCM_WKGDCTL IO_ADDR_CCM(0x34)
+
+#define CCM_CSCR_UPDATE_DIS (1 << 31)
+#define CCM_CSCR_SSI2 (1 << 23)
+#define CCM_CSCR_SSI1 (1 << 22)
+#define CCM_CSCR_VPU (1 << 21)
+#define CCM_CSCR_MSHC (1 << 20)
+#define CCM_CSCR_SPLLRES (1 << 19)
+#define CCM_CSCR_MPLLRES (1 << 18)
+#define CCM_CSCR_SP (1 << 17)
+#define CCM_CSCR_MCU (1 << 16)
+#define CCM_CSCR_OSC26MDIV (1 << 4)
+#define CCM_CSCR_OSC26M (1 << 3)
+#define CCM_CSCR_FPM (1 << 2)
+#define CCM_CSCR_SPEN (1 << 1)
+#define CCM_CSCR_MPEN (1 << 0)
+
+/* i.MX27 TO 2+ */
+#define CCM_CSCR_ARM_SRC (1 << 15)
+
+#define CCM_SPCTL1_LF (1 << 15)
+#define CCM_SPCTL1_BRMO (1 << 6)
+
+static char *vpu_sel_clks[] = { "spll", "mpll_main2", };
+static char *cpu_sel_clks[] = { "mpll_main2", "mpll", };
+
+struct clkl {
+ struct clk_lookup lookup;
+ const char *clkname;
+};
+
+#define clkdev(d, n, c) \
+ { \
+ .lookup.dev_id = d, \
+ .lookup.con_id = n, \
+ .clkname = c, \
+ },
+
+static struct clkl lookups[] = {
+ clkdev("imx21-uart.0", "ipg", "uart1_ipg_gate")
+ clkdev("imx21-uart.0", "per", "per1_gate")
+ clkdev("imx21-uart.1", "ipg", "uart2_ipg_gate")
+ clkdev("imx21-uart.1", "per", "per1_gate")
+ clkdev("imx21-uart.2", "ipg", "uart3_ipg_gate")
+ clkdev("imx21-uart.2", "per", "per1_gate")
+ clkdev("imx21-uart.3", "ipg", "uart4_ipg_gate")
+ clkdev("imx21-uart.3", "per", "per1_gate")
+ clkdev("imx21-uart.4", "ipg", "uart5_ipg_gate")
+ clkdev("imx21-uart.4", "per", "per1_gate")
+ clkdev("imx21-uart.5", "ipg", "uart6_ipg_gate")
+ clkdev("imx21-uart.5", "per", "per1_gate")
+ clkdev("imx-gpt.0", "ipg", "gpt1_ipg_gate")
+ clkdev("imx-gpt.0", "per", "per1_gate")
+ clkdev("imx-gpt.1", "ipg", "gpt2_ipg_gate")
+ clkdev("imx-gpt.1", "per", "per1_gate")
+ clkdev("imx-gpt.2", "ipg", "gpt3_ipg_gate")
+ clkdev("imx-gpt.2", "per", "per1_gate")
+ clkdev("imx-gpt.3", "ipg", "gpt4_ipg_gate")
+ clkdev("imx-gpt.3", "per", "per1_gate")
+ clkdev("imx-gpt.4", "ipg", "gpt5_ipg_gate")
+ clkdev("imx-gpt.4", "per", "per1_gate")
+ clkdev("imx-gpt.5", "ipg", "gpt6_ipg_gate")
+ clkdev("imx-gpt.5", "per", "per1_gate")
+ clkdev("mxc_pwm.0", NULL, "pwm")
+ clkdev("mxc-mmc.0", "per", "per2_gate")
+ clkdev("mxc-mmc.0", "ipg", "sdhc1_ipg_gate")
+ clkdev("mxc-mmc.1", "per", "per2_gate")
+ clkdev("mxc-mmc.1", "ipg", "sdhc2_ipg_gate")
+ clkdev("mxc-mmc.2", "per", "per2_gate")
+ clkdev("mxc-mmc.2", "ipg", "sdhc2_ipg_gate")
+ clkdev("imx27-cspi.0", NULL, "cspi1")
+ clkdev("imx27-cspi.1", NULL, "cspi2")
+ clkdev("imx27-cspi.2", NULL, "cspi3")
+ clkdev("imx-fb.0", "per", "per3_gate")
+ clkdev("imx-fb.0", "ipg", "lcdc_ipg_gate")
+ clkdev("imx-fb.0", "ahb", "lcdc_ahb_gate")
+ clkdev("mx2-camera.0", NULL, "csi")
+ clkdev("fsl-usb2-udc", "usb", "usb")
+ clkdev("fsl-usb2-udc", "usb_ahb", "usb_ahb_gate")
+ clkdev("mxc-ehci.0", "usb", "usb")
+ clkdev("mxc-ehci.0", "usb_ahb", "usb_ahb_gate")
+ clkdev("mxc-ehci.1", "usb", "usb")
+ clkdev("mxc-ehci.1", "usb_ahb", "usb_ahb_gate")
+ clkdev("mxc-ehci.2", "usb", "usb")
+ clkdev("mxc-ehci.2", "usb_ahb", "usb_ahb_gate")
+ clkdev("imx-ssi.0", NULL, "ssi1_ipg_gate")
+ clkdev("imx-ssi.1", NULL, "ssi2_ipg_gate")
+ clkdev("mxc_nand.0", NULL, "nfc_baud_gate")
+ clkdev("imx-vpu", "per", "vpu_baud_gate")
+ clkdev("imx-vpu", "ahb", "vpu_ahb_gate")
+ clkdev("imx-dma", "ahb", "dma_ahb_gate")
+ clkdev("imx-dma", "ipg", "dma_ipg_gate")
+ clkdev("imx27-fec.0", "ipg", "fec_ipg_gate")
+ clkdev("imx27-fec.0", "ahb", "fec_ahb_gate")
+ clkdev("imx2-wdt.0", NULL, "wdog_ipg_gate")
+ clkdev("imx-i2c.0", NULL, "i2c1_ipg_gate")
+ clkdev("imx-i2c.1", NULL, "i2c2_ipg_gate")
+ clkdev("mxc_w1.0", NULL, "owire_ipg_gate")
+ clkdev("imx-keypad", NULL, "kpp_ipg_gate")
+ clkdev("imx-emma", "ahb", "emma_ahb_gate")
+ clkdev("imx-emma", "ipg", "emma_ipg_gate")
+ clkdev(NULL, "iim", "iim_ipg_gate")
+ clkdev(NULL, "gpio", "gpio_ipg_gate")
+ clkdev(NULL, "brom", "brom_ahb_gate")
+ clkdev(NULL, "ata", "ata_ahb_gate")
+ clkdev(NULL, "rtc", "rtc_ipg_gate")
+ clkdev(NULL, "scc", "scc_ipg_gate")
+ clkdev(NULL, "cpu", "cpu_div")
+};
+
+int __init mx27_clocks_init(unsigned long fref)
+{
+ int i;
+
+ imx_clk_fixed("dummy", 0);
+ imx_clk_fixed("ckih", fref);
+ imx_clk_pllv1("mpll", "ckih", CCM_MPCTL0);
+ imx_clk_pllv1("spll", "ckih", CCM_SPCTL0);
+ imx_clk_fixed_factor("mpll_main2", "mpll", 2, 3);
+ imx_clk_divider("ahb", "mpll_main2", CCM_CSCR, 8, 2);
+ imx_clk_fixed_factor("ipg", "ahb", 1, 1);
+ imx_clk_divider("nfc_div", "ahb", CCM_PCDR0, 6, 4);
+ imx_clk_divider("per1_div", "mpll_main2", CCM_PCDR1, 0, 6);
+ imx_clk_divider("per2_div", "mpll_main2", CCM_PCDR1, 8, 6);
+ imx_clk_divider("per3_div", "mpll_main2", CCM_PCDR1, 16, 6);
+ imx_clk_divider("per4_div", "mpll_main2", CCM_PCDR1, 24, 6);
+ imx_clk_mux("vpu_sel", CCM_CSCR, 21, 1, vpu_sel_clks, ARRAY_SIZE(vpu_sel_clks));
+ imx_clk_divider("vpu_div", "vpu_sel", CCM_PCDR0, 10, 6);
+ imx_clk_divider("usb_div", "spll", CCM_CSCR, 28, 3);
+ imx_clk_mux("cpu_sel", CCM_CSCR, 15, 1, cpu_sel_clks, ARRAY_SIZE(cpu_sel_clks));
+ imx_clk_divider("cpu_div", "cpu_sel", CCM_CSCR, 12, 2);
+ imx_clk_gate("ssi2_ipg_gate", "ipg", CCM_PCCR0, 0);
+ imx_clk_gate("ssi1_ipg_gate", "ipg", CCM_PCCR0, 1);
+ imx_clk_gate("slcdc_ipg_gate", "ipg", CCM_PCCR0, 2);
+ imx_clk_gate("sdhc3_ipg_gate", "ipg", CCM_PCCR0, 3);
+ imx_clk_gate("sdhc2_ipg_gate", "ipg", CCM_PCCR0, 4);
+ imx_clk_gate("sdhc1_ipg_gate", "ipg", CCM_PCCR0, 5);
+ imx_clk_gate("scc_ipg_gate", "ipg", CCM_PCCR0, 6);
+ imx_clk_gate("sahara_ipg_gate", "ipg", CCM_PCCR0, 7);
+ imx_clk_gate("rtc_ipg_gate", "ipg", CCM_PCCR0, 9);
+ imx_clk_gate("pwm_ipg_gate", "ipg", CCM_PCCR0, 11);
+ imx_clk_gate("owire_ipg_gate", "ipg", CCM_PCCR0, 12);
+ imx_clk_gate("lcdc_ipg_gate", "ipg", CCM_PCCR0, 14);
+ imx_clk_gate("kpp_ipg_gate", "ipg", CCM_PCCR0, 15);
+ imx_clk_gate("iim_ipg_gate", "ipg", CCM_PCCR0, 16);
+ imx_clk_gate("i2c2_ipg_gate", "ipg", CCM_PCCR0, 17);
+ imx_clk_gate("i2c1_ipg_gate", "ipg", CCM_PCCR0, 18);
+ imx_clk_gate("gpt6_ipg_gate", "ipg", CCM_PCCR0, 19);
+ imx_clk_gate("gpt5_ipg_gate", "ipg", CCM_PCCR0, 20);
+ imx_clk_gate("gpt4_ipg_gate", "ipg", CCM_PCCR0, 21);
+ imx_clk_gate("gpt3_ipg_gate", "ipg", CCM_PCCR0, 22);
+ imx_clk_gate("gpt2_ipg_gate", "ipg", CCM_PCCR0, 23);
+ imx_clk_gate("gpt1_ipg_gate", "ipg", CCM_PCCR0, 24);
+ imx_clk_gate("gpio_ipg_gate", "ipg", CCM_PCCR0, 25);
+ imx_clk_gate("fec_ipg_gate", "ipg", CCM_PCCR0, 26);
+ imx_clk_gate("emma_ipg_gate", "ipg", CCM_PCCR0, 27);
+ imx_clk_gate("dma_ipg_gate", "ipg", CCM_PCCR0, 28);
+ imx_clk_gate("cspi3_ipg_gate", "ipg", CCM_PCCR0, 29);
+ imx_clk_gate("cspi2_ipg_gate", "ipg", CCM_PCCR0, 30);
+ imx_clk_gate("cspi1_ipg_gate", "ipg", CCM_PCCR0, 31);
+ imx_clk_gate("nfc_baud_gate", "nfc_div", CCM_PCCR1, 3);
+ imx_clk_gate("ssi2_baud_gate", "dummy", CCM_PCCR1, 4);
+ imx_clk_gate("ssi1_baud_gate", "dummy", CCM_PCCR1, 5);
+ imx_clk_gate("vpu_baud_gate", "vpu_div", CCM_PCCR1, 6);
+ imx_clk_gate("per4_gate", "per4_div", CCM_PCCR1, 7);
+ imx_clk_gate("per3_gate", "per3_div", CCM_PCCR1, 8);
+ imx_clk_gate("per2_gate", "per2_div", CCM_PCCR1, 9);
+ imx_clk_gate("per1_gate", "per1_div", CCM_PCCR1, 10);
+ imx_clk_gate("usb_ahb_gate", "ahb", CCM_PCCR1, 11);
+ imx_clk_gate("slcdc_ahb_gate", "ahb", CCM_PCCR1, 12);
+ imx_clk_gate("sahara_ahb_gate", "ahb", CCM_PCCR1, 13);
+ imx_clk_gate("lcdc_ahb_gate", "ahb", CCM_PCCR1, 15);
+ imx_clk_gate("vpu_ahb_gate", "ahb", CCM_PCCR1, 16);
+ imx_clk_gate("fec_ahb_gate", "ahb", CCM_PCCR1, 17);
+ imx_clk_gate("emma_ahb_gate", "ahb", CCM_PCCR1, 18);
+ imx_clk_gate("emi_ahb_gate", "ahb", CCM_PCCR1, 19);
+ imx_clk_gate("dma_ahb_gate", "ahb", CCM_PCCR1, 20);
+ imx_clk_gate("csi_ahb_gate", "ahb", CCM_PCCR1, 21);
+ imx_clk_gate("brom_ahb_gate", "ahb", CCM_PCCR1, 22);
+ imx_clk_gate("ata_ahb_gate", "ahb", CCM_PCCR1, 23);
+ imx_clk_gate("wdog_ipg_gate", "ipg", CCM_PCCR1, 24);
+ imx_clk_gate("usb_ipg_gate", "ipg", CCM_PCCR1, 25);
+ imx_clk_gate("uart6_ipg_gate", "ipg", CCM_PCCR1, 26);
+ imx_clk_gate("uart5_ipg_gate", "ipg", CCM_PCCR1, 27);
+ imx_clk_gate("uart4_ipg_gate", "ipg", CCM_PCCR1, 28);
+ imx_clk_gate("uart3_ipg_gate", "ipg", CCM_PCCR1, 29);
+ imx_clk_gate("uart2_ipg_gate", "ipg", CCM_PCCR1, 30);
+ imx_clk_gate("uart1_ipg_gate", "ipg", CCM_PCCR1, 31);
+
+ for (i = 0; i < ARRAY_SIZE(lookups); i++) {
+ struct clkl *l = &lookups[i];
+ l->lookup.clk = __clk_lookup(l->clkname);
+ clkdev_add(&l->lookup);
+ }
+
+ mxc_timer_init(NULL, MX27_IO_ADDRESS(MX27_GPT1_BASE_ADDR),
+ MX27_INT_GPT1);
+ return 0;
+}
--
1.7.9.1
--
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