drivers/clk/imx/clk-imx1.c

   1 /*
   2  *  Copyright (C) 2008 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
  16  */
  17
  18 #include <linux/clkdev.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/err.h>
  21 #include <linux/init.h>
  22 #include <linux/of.h>
  23 #include <linux/of_address.h>
  24 #include <dt-bindings/clock/imx1-clock.h>
  25 #include <soc/imx/timer.h>
  26 #include <asm/irq.h>
  27
  28 #include "clk.h"
  29
  30 #define MX1_CCM_BASE_ADDR       0x0021b000
  31 #define MX1_TIM1_BASE_ADDR      0x00220000
  32 #define MX1_TIM1_INT            (NR_IRQS_LEGACY + 59)
  33
  34 static const char *prem_sel_clks[] = { "clk32_premult", "clk16m", };
  35 static const char *clko_sel_clks[] = { "per1", "hclk", "clk48m", "clk16m",
  36                                        "prem", "fclk", };
  37
  38 static struct clk *clk[IMX1_CLK_MAX];
  39 static struct clk_onecell_data clk_data;
  40
  41 static void __iomem *ccm __initdata;
  42 #define CCM_CSCR        (ccm + 0x0000)
  43 #define CCM_MPCTL0      (ccm + 0x0004)
  44 #define CCM_SPCTL0      (ccm + 0x000c)
  45 #define CCM_PCDR        (ccm + 0x0020)
  46 #define SCM_GCCR        (ccm + 0x0810)
  47
  48 static void __init _mx1_clocks_init(unsigned long fref)
  49 {
  50         clk[IMX1_CLK_DUMMY] = imx_clk_fixed("dummy", 0);
  51         clk[IMX1_CLK_CLK32] = imx_obtain_fixed_clock("clk32", fref);
  52         clk[IMX1_CLK_CLK16M_EXT] = imx_clk_fixed("clk16m_ext", 16000000);
  53         clk[IMX1_CLK_CLK16M] = imx_clk_gate("clk16m", "clk16m_ext", CCM_CSCR, 17);
  54         clk[IMX1_CLK_CLK32_PREMULT] = imx_clk_fixed_factor("clk32_premult", "clk32", 512, 1);
  55         clk[IMX1_CLK_PREM] = imx_clk_mux("prem", CCM_CSCR, 16, 1, prem_sel_clks, ARRAY_SIZE(prem_sel_clks));
  56         clk[IMX1_CLK_MPLL] = imx_clk_pllv1(IMX_PLLV1_IMX1, "mpll", "clk32_premult", CCM_MPCTL0);
  57         clk[IMX1_CLK_MPLL_GATE] = imx_clk_gate("mpll_gate", "mpll", CCM_CSCR, 0);
  58         clk[IMX1_CLK_SPLL] = imx_clk_pllv1(IMX_PLLV1_IMX1, "spll", "prem", CCM_SPCTL0);
  59         clk[IMX1_CLK_SPLL_GATE] = imx_clk_gate("spll_gate", "spll", CCM_CSCR, 1);
  60         clk[IMX1_CLK_MCU] = imx_clk_divider("mcu", "clk32_premult", CCM_CSCR, 15, 1);
  61         clk[IMX1_CLK_FCLK] = imx_clk_divider("fclk", "mpll_gate", CCM_CSCR, 15, 1);
  62         clk[IMX1_CLK_HCLK] = imx_clk_divider("hclk", "spll_gate", CCM_CSCR, 10, 4);
  63         clk[IMX1_CLK_CLK48M] = imx_clk_divider("clk48m", "spll_gate", CCM_CSCR, 26, 3);
  64         clk[IMX1_CLK_PER1] = imx_clk_divider("per1", "spll_gate", CCM_PCDR, 0, 4);
  65         clk[IMX1_CLK_PER2] = imx_clk_divider("per2", "spll_gate", CCM_PCDR, 4, 4);
  66         clk[IMX1_CLK_PER3] = imx_clk_divider("per3", "spll_gate", CCM_PCDR, 16, 7);
  67         clk[IMX1_CLK_CLKO] = imx_clk_mux("clko", CCM_CSCR, 29, 3, clko_sel_clks, ARRAY_SIZE(clko_sel_clks));
  68         clk[IMX1_CLK_UART3_GATE] = imx_clk_gate("uart3_gate", "hclk", SCM_GCCR, 6);
  69         clk[IMX1_CLK_SSI2_GATE] = imx_clk_gate("ssi2_gate", "hclk", SCM_GCCR, 5);
  70         clk[IMX1_CLK_BROM_GATE] = imx_clk_gate("brom_gate", "hclk", SCM_GCCR, 4);
  71         clk[IMX1_CLK_DMA_GATE] = imx_clk_gate("dma_gate", "hclk", SCM_GCCR, 3);
  72         clk[IMX1_CLK_CSI_GATE] = imx_clk_gate("csi_gate", "hclk", SCM_GCCR, 2);
  73         clk[IMX1_CLK_MMA_GATE] = imx_clk_gate("mma_gate", "hclk", SCM_GCCR, 1);
  74         clk[IMX1_CLK_USBD_GATE] = imx_clk_gate("usbd_gate", "clk48m", SCM_GCCR, 0);
  75
  76         imx_check_clocks(clk, ARRAY_SIZE(clk));
  77 }
  78
  79 int __init mx1_clocks_init(unsigned long fref)
  80 {
  81         ccm = ioremap(MX1_CCM_BASE_ADDR, SZ_4K);
  82         BUG_ON(!ccm);
  83
  84         _mx1_clocks_init(fref);
  85
  86         clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx-gpt.0");
  87         clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx-gpt.0");
  88         clk_register_clkdev(clk[IMX1_CLK_DMA_GATE], "ahb", "imx1-dma");
  89         clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-dma");
  90         clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.0");
  91         clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.0");
  92         clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.1");
  93         clk_register_clkdev(clk[IMX1_CLK_HCLK], "ipg", "imx1-uart.1");
  94         clk_register_clkdev(clk[IMX1_CLK_PER1], "per", "imx1-uart.2");
  95         clk_register_clkdev(clk[IMX1_CLK_UART3_GATE], "ipg", "imx1-uart.2");
  96         clk_register_clkdev(clk[IMX1_CLK_HCLK], NULL, "imx1-i2c.0");
  97         clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.0");
  98         clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.0");
  99         clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-cspi.1");
 100         clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-cspi.1");
 101         clk_register_clkdev(clk[IMX1_CLK_PER2], "per", "imx1-fb.0");
 102         clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ipg", "imx1-fb.0");
 103         clk_register_clkdev(clk[IMX1_CLK_DUMMY], "ahb", "imx1-fb.0");
 104
 105         mxc_timer_init(MX1_TIM1_BASE_ADDR, MX1_TIM1_INT, GPT_TYPE_IMX1);
 106
 107         return 0;
 108 }
 109
 110 static void __init mx1_clocks_init_dt(struct device_node *np)
 111 {
 112         ccm = of_iomap(np, 0);
 113         BUG_ON(!ccm);
 114
 115         _mx1_clocks_init(32768);
 116
 117         clk_data.clks = clk;
 118         clk_data.clk_num = ARRAY_SIZE(clk);
 119         of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 120 }
 121 CLK_OF_DECLARE(imx1_ccm, "fsl,imx1-ccm", mx1_clocks_init_dt);