ARM: i.MX1 clk: Add devicetree support

This patch adds devicetree support CCM module for i.MX1 (MC9328MX1) CPUs.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --git a/Documentation/devicetree/bindings/clock/imx1-clock.txt b/Documentation/devicetree/bindings/clock/imx1-clock.txt
new file mode 100644 (file)
index 0000000..b7adf4e
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/imx1-clock.txt
@@ -0,0 +1,26 @@
+* Clock bindings for Freescale i.MX1 CPUs
+
+Required properties:
+- compatible: Should be "fsl,imx1-ccm".
+- reg: Address and length of the register set.
+- #clock-cells: Should be <1>.
+
+The clock consumer should specify the desired clock by having the clock
+ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx1-clock.h
+for the full list of i.MX1 clock IDs.
+
+Examples:
+       clks: ccm@0021b000 {
+               #clock-cells = <1>;
+               compatible = "fsl,imx1-ccm";
+               reg = <0x0021b000 0x1000>;
+       };
+
+       pwm: pwm@00208000 {
+               #pwm-cells = <2>;
+               compatible = "fsl,imx1-pwm";
+               reg = <0x00208000 0x1000>;
+               interrupts = <34>;
+               clocks = <&clks IMX1_CLK_DUMMY>, <&clks IMX1_CLK_PER1>;
+               clock-names = "ipg", "per";
+       };

diff --git a/arch/arm/mach-imx/clk-imx1.c b/arch/arm/mach-imx/clk-imx1.c
index 7f739be..e9c391b 100644 (file)
--- a/arch/arm/mach-imx/clk-imx1.c
+++ b/arch/arm/mach-imx/clk-imx1.c
@@ -15,100 +15,111 @@
  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
-#include <linux/kernel.h>
-#include <linux/init.h>
 #include <linux/clk.h>
-#include <linux/io.h>
 #include <linux/clkdev.h>
+#include <linux/clk-provider.h>
 #include <linux/err.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <dt-bindings/clock/imx1-clock.h>
 
 #include "clk.h"
 #include "common.h"
 #include "hardware.h"
 
-/* CCM register addresses */
-#define IO_ADDR_CCM(off)       (MX1_IO_ADDRESS(MX1_CCM_BASE_ADDR + (off)))
-
-#define CCM_CSCR       IO_ADDR_CCM(0x0)
-#define CCM_MPCTL0     IO_ADDR_CCM(0x4)
-#define CCM_SPCTL0     IO_ADDR_CCM(0xc)
-#define CCM_PCDR       IO_ADDR_CCM(0x20)
-
-/* SCM register addresses */
-#define IO_ADDR_SCM(off)       (MX1_IO_ADDRESS(MX1_SCM_BASE_ADDR + (off)))
-
-#define SCM_GCCR       IO_ADDR_SCM(0xc)
-
 static const char *prem_sel_clks[] = { "clk32_premult", "clk16m", };
 static const char *clko_sel_clks[] = { "per1", "hclk", "clk48m", "clk16m",
                                       "prem", "fclk", };
 
-enum imx1_clks {
-       dummy, clk32, clk16m_ext, clk16m, clk32_premult, prem, mpll, mpll_gate,
-       spll, spll_gate, mcu, fclk, hclk, clk48m, per1, per2, per3, clko,
-       uart3_gate, ssi2_gate, brom_gate, dma_gate, csi_gate, mma_gate,
-       usbd_gate, clk_max
-};
+static struct clk *clk[IMX1_CLK_MAX];
+static struct clk_onecell_data clk_data;
 
-static struct clk *clk[clk_max];
+static void __iomem *ccm __initdata;
+#define CCM_CSCR       (ccm + 0x0000)
+#define CCM_MPCTL0     (ccm + 0x0004)
+#define CCM_SPCTL0     (ccm + 0x000c)
+#define CCM_PCDR       (ccm + 0x0020)
+#define SCM_GCCR       (ccm + 0x0810)
 
-int __init mx1_clocks_init(unsigned long fref)
+static void __init _mx1_clocks_init(unsigned long fref)
 {
-       int i;
-
-       clk[dummy] = imx_clk_fixed("dummy", 0);
-       clk[clk32] = imx_clk_fixed("clk32", fref);
-       clk[clk16m_ext] = imx_clk_fixed("clk16m_ext", 16000000);
-       clk[clk16m] = imx_clk_gate("clk16m", "clk16m_ext", CCM_CSCR, 17);
-       clk[clk32_premult] = imx_clk_fixed_factor("clk32_premult", "clk32", 512, 1);
-       clk[prem] = imx_clk_mux("prem", CCM_CSCR, 16, 1, prem_sel_clks,
-                       ARRAY_SIZE(prem_sel_clks));
-       clk[mpll] = imx_clk_pllv1("mpll", "clk32_premult", CCM_MPCTL0);
-       clk[mpll_gate] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
-       clk[spll] = imx_clk_pllv1("spll", "prem", CCM_SPCTL0);
-       clk[spll_gate] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
-       clk[mcu] = imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
-       clk[fclk] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 15, 1);
-       clk[hclk] = imx_clk_divider("hclk", "spll_gate", CCM_CSCR, 10, 4);
-       clk[clk48m] = imx_clk_divider("clk48m", "spll_gate", CCM_CSCR, 26, 3);
-       clk[per1] = imx_clk_divider("per1", "spll_gate", CCM_PCDR, 0, 4);
-       clk[per2] = imx_clk_divider("per2", "spll_gate", CCM_PCDR, 4, 4);
-       clk[per3] = imx_clk_divider("per3", "spll_gate", CCM_PCDR, 16, 7);
-       clk[clko] = imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks,
-                       ARRAY_SIZE(clko_sel_clks));
-       clk[uart3_gate] = imx_clk_gate("uart3_gate", "hclk", SCM_GCCR, 6);
-       clk[ssi2_gate] = imx_clk_gate("ssi2_gate", "hclk", SCM_GCCR, 5);
-       clk[brom_gate] = imx_clk_gate("brom_gate", "hclk", SCM_GCCR, 4);
-       clk[dma_gate] = imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 3);
-       clk[csi_gate] = imx_clk_gate("csi_gate", "hclk", SCM_GCCR, 2);
-       clk[mma_gate] = imx_clk_gate("mma_gate", "hclk", SCM_GCCR, 1);
-       clk[usbd_gate] = imx_clk_gate("usbd_gate", "clk48m", SCM_GCCR, 0);
+       unsigned i;
+
+       clk[IMX1_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
+       clk[IMX1_CLK_CLK32] = imx_obtain_fixed_clock("clk32", fref);
+       clk[IMX1_CLK_CLK16M_EXT] = imx_clk_fixed("clk16m_ext", 16000000);
+       clk[IMX1_CLK_CLK16M] = imx_clk_gate("clk16m", "clk16m_ext", CCM_CSCR, 17);
+       clk[IMX1_CLK_CLK32_PREMULT] = imx_clk_fixed_factor("clk32_premult", "clk32", 512, 1);
+       clk[IMX1_CLK_PREM] = imx_clk_mux("prem", CCM_CSCR, 16, 1, prem_sel_clks, ARRAY_SIZE(prem_sel_clks));
+       clk[IMX1_CLK_MPLL] = imx_clk_pllv1("mpll", "clk32_premult", CCM_MPCTL0);
+       clk[IMX1_CLK_MPLL_GATE] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
+       clk[IMX1_CLK_SPLL] = imx_clk_pllv1("spll", "prem", CCM_SPCTL0);
+       clk[IMX1_CLK_SPLL_GATE] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
+       clk[IMX1_CLK_MCU] = imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
+       clk[IMX1_CLK_FCLK] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 15, 1);
+       clk[IMX1_CLK_HCLK] = imx_clk_divider("hclk", "spll_gate", CCM_CSCR, 10, 4);
+       clk[IMX1_CLK_CLK48M] = imx_clk_divider("clk48m", "spll_gate", CCM_CSCR, 26, 3);
+       clk[IMX1_CLK_PER1] = imx_clk_divider("per1", "spll_gate", CCM_PCDR, 0, 4);
+       clk[IMX1_CLK_PER2] = imx_clk_divider("per2", "spll_gate", CCM_PCDR, 4, 4);
+       clk[IMX1_CLK_PER3] = imx_clk_divider("per3", "spll_gate", CCM_PCDR, 16, 7);
+       clk[IMX1_CLK_CLKO] = imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks, ARRAY_SIZE(clko_sel_clks));
+       clk[IMX1_CLK_UART3_GATE] = imx_clk_gate("uart3_gate", "hclk", SCM_GCCR, 6);
+       clk[IMX1_CLK_SSI2_GATE] = imx_clk_gate("ssi2_gate", "hclk", SCM_GCCR, 5);
+       clk[IMX1_CLK_BROM_GATE] = imx_clk_gate("brom_gate", "hclk", SCM_GCCR, 4);
+       clk[IMX1_CLK_DMA_GATE] = imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 3);
+       clk[IMX1_CLK_CSI_GATE] = imx_clk_gate("csi_gate", "hclk", SCM_GCCR, 2);
+       clk[IMX1_CLK_MMA_GATE] = imx_clk_gate("mma_gate", "hclk", SCM_GCCR, 1);
+       clk[IMX1_CLK_USBD_GATE] = imx_clk_gate("usbd_gate", "clk48m", SCM_GCCR, 0);
 
        for (i = 0; i < ARRAY_SIZE(clk); i++)
                if (IS_ERR(clk[i]))
                        pr_err("imx1 clk %d: register failed with %ld\n",
                                i, PTR_ERR(clk[i]));
 
-       clk_register_clkdev(clk[dma_gate], "ahb", "imx1-dma");
-       clk_register_clkdev(clk[hclk], "ipg", "imx1-dma");
-       clk_register_clkdev(clk[per1], "per", "imx-gpt.0");
-       clk_register_clkdev(clk[hclk], "ipg", "imx-gpt.0");
-       clk_register_clkdev(clk[per1], "per", "imx1-uart.0");
-       clk_register_clkdev(clk[hclk], "ipg", "imx1-uart.0");
-       clk_register_clkdev(clk[per1], "per", "imx1-uart.1");
-       clk_register_clkdev(clk[hclk], "ipg", "imx1-uart.1");
-       clk_register_clkdev(clk[per1], "per", "imx1-uart.2");
-       clk_register_clkdev(clk[uart3_gate], "ipg", "imx1-uart.2");
-       clk_register_clkdev(clk[hclk], NULL, "imx1-i2c.0");
-       clk_register_clkdev(clk[per2], "per", "imx1-cspi.0");
-       clk_register_clkdev(clk[dummy], "ipg", "imx1-cspi.0");
-       clk_register_clkdev(clk[per2], "per", "imx1-cspi.1");
-       clk_register_clkdev(clk[dummy], "ipg", "imx1-cspi.1");
-       clk_register_clkdev(clk[per2], "per", "imx1-fb.0");
-       clk_register_clkdev(clk[dummy], "ipg", "imx1-fb.0");
-       clk_register_clkdev(clk[dummy], "ahb", "imx1-fb.0");
+       clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx-gpt.0");
+       clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx-gpt.0");
+}
+
+int __init mx1_clocks_init(unsigned long fref)
+{
+       ccm = MX1_IO_ADDRESS(MX1_CCM_BASE_ADDR);
+
+       _mx1_clocks_init(fref);
+
+       clk_register_clkdev(clk[IMX1_CLK_DMA_GATE], "ahb", "imx1-dma");
+       clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-dma");
+       clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.0");
+       clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.0");
+       clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.1");
+       clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.1");
+       clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.2");
+       clk_register_clkdev(clk[IMX1_CLK_UART3_GATE], "ipg", "imx1-uart.2");
+       clk_register_clkdev(clk[IMX1_CLK_HCLK], NULL, "imx1-i2c.0");
+       clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.0");
+       clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.0");
+       clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.1");
+       clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.1");
+       clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-fb.0");
+       clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-fb.0");
+       clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ahb", "imx1-fb.0");
 
        mxc_timer_init(MX1_IO_ADDRESS(MX1_TIM1_BASE_ADDR), MX1_TIM1_INT);
 
        return 0;
 }
+
+static void __init mx1_clocks_init_dt(struct device_node *np)
+{
+       ccm = of_iomap(np, 0);
+       BUG_ON(!ccm);
+
+       _mx1_clocks_init(32768);
+
+       clk_data.clks = clk;
+       clk_data.clk_num = ARRAY_SIZE(clk);
+       of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
+
+       mxc_timer_init_dt(of_find_compatible_node(NULL, NULL, "fsl,imx1-gpt"));
+}
+CLK_OF_DECLARE(imx1_ccm, "fsl,imx1-ccm", mx1_clocks_init_dt);

diff --git a/include/dt-bindings/clock/imx1-clock.h b/include/dt-bindings/clock/imx1-clock.h
new file mode 100644 (file)
index 0000000..607bf01
--- /dev/null
+++ b/include/dt-bindings/clock/imx1-clock.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#ifndef __DT_BINDINGS_CLOCK_IMX1_H
+#define __DT_BINDINGS_CLOCK_IMX1_H
+
+#define IMX1_CLK_DUMMY         0
+#define IMX1_CLK_CLK32         1
+#define IMX1_CLK_CLK16M_EXT    2
+#define IMX1_CLK_CLK16M                3
+#define IMX1_CLK_CLK32_PREMULT 4
+#define IMX1_CLK_PREM          5
+#define IMX1_CLK_MPLL          6
+#define IMX1_CLK_MPLL_GATE     7
+#define IMX1_CLK_SPLL          8
+#define IMX1_CLK_SPLL_GATE     9
+#define IMX1_CLK_MCU           10
+#define IMX1_CLK_FCLK          11
+#define IMX1_CLK_HCLK          12
+#define IMX1_CLK_CLK48M                13
+#define IMX1_CLK_PER1          14
+#define IMX1_CLK_PER2          15
+#define IMX1_CLK_PER3          16
+#define IMX1_CLK_CLKO          17
+#define IMX1_CLK_UART3_GATE    18
+#define IMX1_CLK_SSI2_GATE     19
+#define IMX1_CLK_BROM_GATE     20
+#define IMX1_CLK_DMA_GATE      21
+#define IMX1_CLK_CSI_GATE      22
+#define IMX1_CLK_MMA_GATE      23
+#define IMX1_CLK_USBD_GATE     24
+#define IMX1_CLK_MAX           25
+
+#endif