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Linux/drivers/clk/shmobile/clk-emev2.c

  1 /*
  2  * EMMA Mobile EV2 common clock framework support
  3  *
  4  * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com>
  5  * Copyright (C) 2012 Magnus Damm
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; version 2 of the License.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 19  */
 20 #include <linux/clk-provider.h>
 21 #include <linux/clkdev.h>
 22 #include <linux/io.h>
 23 #include <linux/of.h>
 24 #include <linux/of_address.h>
 25 
 26 /* EMEV2 SMU registers */
 27 #define USIAU0_RSTCTRL 0x094
 28 #define USIBU1_RSTCTRL 0x0ac
 29 #define USIBU2_RSTCTRL 0x0b0
 30 #define USIBU3_RSTCTRL 0x0b4
 31 #define IIC0_RSTCTRL 0x0dc
 32 #define IIC1_RSTCTRL 0x0e0
 33 #define STI_RSTCTRL 0x124
 34 #define STI_CLKSEL 0x688
 35 
 36 static DEFINE_SPINLOCK(lock);
 37 
 38 /* not pretty, but hey */
 39 static void __iomem *smu_base;
 40 
 41 static void __init emev2_smu_write(unsigned long value, int offs)
 42 {
 43         BUG_ON(!smu_base || (offs >= PAGE_SIZE));
 44         writel_relaxed(value, smu_base + offs);
 45 }
 46 
 47 static const struct of_device_id smu_id[] __initconst = {
 48         { .compatible = "renesas,emev2-smu", },
 49         {},
 50 };
 51 
 52 static void __init emev2_smu_init(void)
 53 {
 54         struct device_node *np;
 55 
 56         np = of_find_matching_node(NULL, smu_id);
 57         BUG_ON(!np);
 58         smu_base = of_iomap(np, 0);
 59         BUG_ON(!smu_base);
 60         of_node_put(np);
 61 
 62         /* setup STI timer to run on 32.768 kHz and deassert reset */
 63         emev2_smu_write(0, STI_CLKSEL);
 64         emev2_smu_write(1, STI_RSTCTRL);
 65 
 66         /* deassert reset for UART0->UART3 */
 67         emev2_smu_write(2, USIAU0_RSTCTRL);
 68         emev2_smu_write(2, USIBU1_RSTCTRL);
 69         emev2_smu_write(2, USIBU2_RSTCTRL);
 70         emev2_smu_write(2, USIBU3_RSTCTRL);
 71 
 72         /* deassert reset for IIC0->IIC1 */
 73         emev2_smu_write(1, IIC0_RSTCTRL);
 74         emev2_smu_write(1, IIC1_RSTCTRL);
 75 }
 76 
 77 static void __init emev2_smu_clkdiv_init(struct device_node *np)
 78 {
 79         u32 reg[2];
 80         struct clk *clk;
 81         const char *parent_name = of_clk_get_parent_name(np, 0);
 82         if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
 83                 return;
 84         if (!smu_base)
 85                 emev2_smu_init();
 86         clk = clk_register_divider(NULL, np->name, parent_name, 0,
 87                                    smu_base + reg[0], reg[1], 8, 0, &lock);
 88         of_clk_add_provider(np, of_clk_src_simple_get, clk);
 89         clk_register_clkdev(clk, np->name, NULL);
 90         pr_debug("## %s %s %p\n", __func__, np->name, clk);
 91 }
 92 CLK_OF_DECLARE(emev2_smu_clkdiv, "renesas,emev2-smu-clkdiv",
 93                 emev2_smu_clkdiv_init);
 94 
 95 static void __init emev2_smu_gclk_init(struct device_node *np)
 96 {
 97         u32 reg[2];
 98         struct clk *clk;
 99         const char *parent_name = of_clk_get_parent_name(np, 0);
100         if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2)))
101                 return;
102         if (!smu_base)
103                 emev2_smu_init();
104         clk = clk_register_gate(NULL, np->name, parent_name, 0,
105                                 smu_base + reg[0], reg[1], 0, &lock);
106         of_clk_add_provider(np, of_clk_src_simple_get, clk);
107         clk_register_clkdev(clk, np->name, NULL);
108         pr_debug("## %s %s %p\n", __func__, np->name, clk);
109 }
110 CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);
111 

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