1 // SPDX-License-Identifier: GPL-2.0 2 /***************************************************************************/ 3 4 /* 5 * m54xx.c -- platform support for ColdFire 54xx based boards 6 * 7 * Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be> 8 */ 9 10 /***************************************************************************/ 11 12 #include <linux/clkdev.h> 13 #include <linux/kernel.h> 14 #include <linux/param.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/mm.h> 19 #include <linux/clk.h> 20 #include <linux/memblock.h> 21 #include <asm/pgalloc.h> 22 #include <asm/machdep.h> 23 #include <asm/coldfire.h> 24 #include <asm/m54xxsim.h> 25 #include <asm/mcfuart.h> 26 #include <asm/mcfclk.h> 27 #include <asm/m54xxgpt.h> 28 #ifdef CONFIG_MMU 29 #include <asm/mmu_context.h> 30 #endif 31 32 /***************************************************************************/ 33 34 DEFINE_CLK(pll, "pll.0", MCF_CLK); 35 DEFINE_CLK(sys, "sys.0", MCF_BUSCLK); 36 37 static struct clk_lookup m54xx_clk_lookup[] = { 38 CLKDEV_INIT(NULL, "pll.0", &clk_pll), 39 CLKDEV_INIT(NULL, "sys.0", &clk_sys), 40 CLKDEV_INIT("mcfslt.0", NULL, &clk_sys), 41 CLKDEV_INIT("mcfslt.1", NULL, &clk_sys), 42 CLKDEV_INIT("mcfuart.0", NULL, &clk_sys), 43 CLKDEV_INIT("mcfuart.1", NULL, &clk_sys), 44 CLKDEV_INIT("mcfuart.2", NULL, &clk_sys), 45 CLKDEV_INIT("mcfuart.3", NULL, &clk_sys), 46 CLKDEV_INIT("imx1-i2c.0", NULL, &clk_sys), 47 }; 48 49 /***************************************************************************/ 50 51 static void __init m54xx_uarts_init(void) 52 { 53 /* enable io pins */ 54 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0); 55 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS, 56 MCFGPIO_PAR_PSC1); 57 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS | 58 MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2); 59 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3); 60 } 61 62 /***************************************************************************/ 63 64 static void __init m54xx_i2c_init(void) 65 { 66 #if IS_ENABLED(CONFIG_I2C_IMX) 67 u32 r; 68 69 /* set the fec/i2c/irq pin assignment register for i2c */ 70 r = readl(MCF_PAR_FECI2CIRQ); 71 r |= MCF_PAR_FECI2CIRQ_SDA | MCF_PAR_FECI2CIRQ_SCL; 72 writel(r, MCF_PAR_FECI2CIRQ); 73 #endif /* IS_ENABLED(CONFIG_I2C_IMX) */ 74 } 75 76 /***************************************************************************/ 77 78 static void mcf54xx_reset(void) 79 { 80 /* disable interrupts and enable the watchdog */ 81 asm("movew #0x2700, %sr\n"); 82 __raw_writel(0, MCF_GPT_GMS0); 83 __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0); 84 __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4), 85 MCF_GPT_GMS0); 86 } 87 88 /***************************************************************************/ 89 90 void __init config_BSP(char *commandp, int size) 91 { 92 mach_reset = mcf54xx_reset; 93 mach_sched_init = hw_timer_init; 94 m54xx_uarts_init(); 95 m54xx_i2c_init(); 96 97 clkdev_add_table(m54xx_clk_lookup, ARRAY_SIZE(m54xx_clk_lookup)); 98 } 99 100 /***************************************************************************/ 101