ARM i.MX1: implement clocks using common clock framework

This also changes the DMA clkdev lookup to use the imx-dma driver name
and "ahb" as connection ID to request the hclk dma clock.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

3 files changed, 117 insertions, 1 deletions

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 0b832b17d4fc..c03920af141e 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -34,6 +34,7 @@ config ARCH_MX53
 config SOC_IMX1
         bool
         select ARCH_MX1
+        select COMMON_CLK
         select CPU_ARM920T
         select IMX_HAVE_IOMUX_V1
         select MXC_AVIC
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index 173e869f0590..52b3af498a6d 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -1,4 +1,4 @@
-obj-$(CONFIG_SOC_IMX1) += clock-imx1.o mm-imx1.o
+obj-$(CONFIG_SOC_IMX1) += clk-imx1.o mm-imx1.o
 obj-$(CONFIG_SOC_IMX21) += clock-imx21.o mm-imx21.o
 
 obj-$(CONFIG_SOC_IMX25) += clk-imx25.o mm-imx25.o ehci-imx25.o cpu-imx25.o
diff --git a/arch/arm/mach-imx/clk-imx1.c b/arch/arm/mach-imx/clk-imx1.c
new file mode 100644
index 000000000000..0f0beb580b73
--- /dev/null
+++ b/arch/arm/mach-imx/clk-imx1.c
@@ -0,0 +1,115 @@
+/*
+ *  Copyright (C) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 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/err.h>
+
+#include <mach/hardware.h>
+#include <mach/common.h>
+#include "clk.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, spll, mcu,
+        fclk, hclk, clk48m, per1, per2, per3, clko, dma_gate, csi_gate,
+        mma_gate, usbd_gate, clk_max
+};
+
+static struct clk *clk[clk_max];
+
+int __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[spll] = imx_clk_pllv1("spll", "prem", CCM_SPCTL0);
+        clk[mcu] = imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
+        clk[fclk] = imx_clk_divider("fclk", "mpll", CCM_CSCR, 15, 1);
+        clk[hclk] = imx_clk_divider("hclk", "spll", CCM_CSCR, 10, 4);
+        clk[clk48m] = imx_clk_divider("clk48m", "spll", CCM_CSCR, 26, 3);
+        clk[per1] = imx_clk_divider("per1", "spll", CCM_PCDR, 0, 4);
+        clk[per2] = imx_clk_divider("per2", "spll", CCM_PCDR, 4, 4);
+        clk[per3] = imx_clk_divider("per3", "spll", CCM_PCDR, 16, 7);
+        clk[clko] = imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks,
+                        ARRAY_SIZE(clko_sel_clks));
+        clk[dma_gate] = imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 4);
+        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);
+
+        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", "imx-dma");
+        clk_register_clkdev(clk[csi_gate], NULL, "mx1-camera.0");
+        clk_register_clkdev(clk[mma_gate], "mma", NULL);
+        clk_register_clkdev(clk[usbd_gate], NULL, "imx_udc.0");
+        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[hclk], "ipg", "imx1-uart.2");
+        clk_register_clkdev(clk[hclk], NULL, "imx-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], NULL, "imx-mmc.0");
+        clk_register_clkdev(clk[per2], "per", "imx-fb.0");
+        clk_register_clkdev(clk[dummy], "ipg", "imx-fb.0");
+        clk_register_clkdev(clk[dummy], "ahb", "imx-fb.0");
+        clk_register_clkdev(clk[hclk], "mshc", NULL);
+        clk_register_clkdev(clk[per3], "ssi", NULL);
+        clk_register_clkdev(clk[clk32], NULL, "mxc_rtc.0");
+        clk_register_clkdev(clk[clko], "clko", NULL);
+
+        mxc_timer_init(NULL, MX1_IO_ADDRESS(MX1_TIM1_BASE_ADDR),
+                        MX1_TIM1_INT);
+
+        return 0;
+}