/* * EMMA Mobile EV2 common clock framework support * * Copyright (C) 2013 Takashi Yoshii <takashi.yoshii.ze@renesas.com> * Copyright (C) 2012 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; version 2 of the License. * * 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/clk-provider.h> #include <linux/clkdev.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_address.h> /* EMEV2 SMU registers */ #define USIAU0_RSTCTRL 0x094 #define USIBU1_RSTCTRL 0x0ac #define USIBU2_RSTCTRL 0x0b0 #define USIBU3_RSTCTRL 0x0b4 #define STI_RSTCTRL 0x124 #define STI_CLKSEL 0x688 static DEFINE_SPINLOCK(lock); /* not pretty, but hey */ static void __iomem *smu_base; static void __init emev2_smu_write(unsigned long value, int offs) { BUG_ON(!smu_base || (offs >= PAGE_SIZE)); writel_relaxed(value, smu_base + offs); } static const struct of_device_id smu_id[] __initconst = { { .compatible = "renesas,emev2-smu", }, {}, }; static void __init emev2_smu_init(void) { struct device_node *np; np = of_find_matching_node(NULL, smu_id); BUG_ON(!np); smu_base = of_iomap(np, 0); BUG_ON(!smu_base); of_node_put(np); /* setup STI timer to run on 32.768 kHz and deassert reset */ emev2_smu_write(0, STI_CLKSEL); emev2_smu_write(1, STI_RSTCTRL); /* deassert reset for UART0->UART3 */ emev2_smu_write(2, USIAU0_RSTCTRL); emev2_smu_write(2, USIBU1_RSTCTRL); emev2_smu_write(2, USIBU2_RSTCTRL); emev2_smu_write(2, USIBU3_RSTCTRL); } static void __init emev2_smu_clkdiv_init(struct device_node *np) { u32 reg[2]; struct clk *clk; const char *parent_name = of_clk_get_parent_name(np, 0); if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2))) return; if (!smu_base) emev2_smu_init(); clk = clk_register_divider(NULL, np->name, parent_name, 0, smu_base + reg[0], reg[1], 8, 0, &lock); of_clk_add_provider(np, of_clk_src_simple_get, clk); clk_register_clkdev(clk, np->name, NULL); pr_debug("## %s %s %p\n", __func__, np->name, clk); } CLK_OF_DECLARE(emev2_smu_clkdiv, "renesas,emev2-smu-clkdiv", emev2_smu_clkdiv_init); static void __init emev2_smu_gclk_init(struct device_node *np) { u32 reg[2]; struct clk *clk; const char *parent_name = of_clk_get_parent_name(np, 0); if (WARN_ON(of_property_read_u32_array(np, "reg", reg, 2))) return; if (!smu_base) emev2_smu_init(); clk = clk_register_gate(NULL, np->name, parent_name, 0, smu_base + reg[0], reg[1], 0, &lock); of_clk_add_provider(np, of_clk_src_simple_get, clk); clk_register_clkdev(clk, np->name, NULL); pr_debug("## %s %s %p\n", __func__, np->name, clk); } CLK_OF_DECLARE(emev2_smu_gclk, "renesas,emev2-smu-gclk", emev2_smu_gclk_init);