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/kernel.h> 13 #include <linux/param.h> 14 #include <linux/init.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/mm.h> 18 #include <linux/clk.h> 19 #include <linux/bootmem.h> 20 #include <asm/pgalloc.h> 21 #include <asm/machdep.h> 22 #include <asm/coldfire.h> 23 #include <asm/m54xxsim.h> 24 #include <asm/mcfuart.h> 25 #include <asm/mcfclk.h> 26 #include <asm/m54xxgpt.h> 27 #ifdef CONFIG_MMU 28 #include <asm/mmu_context.h> 29 #endif 30 31 /***************************************************************************/ 32 33 DEFINE_CLK(pll, "pll.0", MCF_CLK); 34 DEFINE_CLK(sys, "sys.0", MCF_BUSCLK); 35 DEFINE_CLK(mcfslt0, "mcfslt.0", MCF_BUSCLK); 36 DEFINE_CLK(mcfslt1, "mcfslt.1", MCF_BUSCLK); 37 DEFINE_CLK(mcfuart0, "mcfuart.0", MCF_BUSCLK); 38 DEFINE_CLK(mcfuart1, "mcfuart.1", MCF_BUSCLK); 39 DEFINE_CLK(mcfuart2, "mcfuart.2", MCF_BUSCLK); 40 DEFINE_CLK(mcfuart3, "mcfuart.3", MCF_BUSCLK); 41 DEFINE_CLK(mcfi2c0, "imx1-i2c.0", MCF_BUSCLK); 42 43 struct clk *mcf_clks[] = { 44 &clk_pll, 45 &clk_sys, 46 &clk_mcfslt0, 47 &clk_mcfslt1, 48 &clk_mcfuart0, 49 &clk_mcfuart1, 50 &clk_mcfuart2, 51 &clk_mcfuart3, 52 &clk_mcfi2c0, 53 NULL 54 }; 55 56 /***************************************************************************/ 57 58 static void __init m54xx_uarts_init(void) 59 { 60 /* enable io pins */ 61 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC0); 62 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS, 63 MCFGPIO_PAR_PSC1); 64 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS | 65 MCF_PAR_PSC_CTS_CTS, MCFGPIO_PAR_PSC2); 66 __raw_writeb(MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, MCFGPIO_PAR_PSC3); 67 } 68 69 /***************************************************************************/ 70 71 static void __init m54xx_i2c_init(void) 72 { 73 #if IS_ENABLED(CONFIG_I2C_IMX) 74 u32 r; 75 76 /* set the fec/i2c/irq pin assignment register for i2c */ 77 r = readl(MCF_PAR_FECI2CIRQ); 78 r |= MCF_PAR_FECI2CIRQ_SDA | MCF_PAR_FECI2CIRQ_SCL; 79 writel(r, MCF_PAR_FECI2CIRQ); 80 #endif /* IS_ENABLED(CONFIG_I2C_IMX) */ 81 } 82 83 /***************************************************************************/ 84 85 static void mcf54xx_reset(void) 86 { 87 /* disable interrupts and enable the watchdog */ 88 asm("movew #0x2700, %sr\n"); 89 __raw_writel(0, MCF_GPT_GMS0); 90 __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_GPT_GCIR0); 91 __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4), 92 MCF_GPT_GMS0); 93 } 94 95 /***************************************************************************/ 96 97 void __init config_BSP(char *commandp, int size) 98 { 99 mach_reset = mcf54xx_reset; 100 mach_sched_init = hw_timer_init; 101 m54xx_uarts_init(); 102 m54xx_i2c_init(); 103 } 104 105 /***************************************************************************/ 106