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
34DEFINE_CLK(pll, "pll.0", MCF_CLK);
35DEFINE_CLK(sys, "sys.0", MCF_BUSCLK);
36
37static 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
51static void __init m54xx_uarts_init(void)
52{
53 /* enable io pins */
54 __raw_writeb(val: MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, addr: MCFGPIO_PAR_PSC0);
55 __raw_writeb(val: MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS,
56 addr: MCFGPIO_PAR_PSC1);
57 __raw_writeb(val: MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD | MCF_PAR_PSC_RTS_RTS |
58 MCF_PAR_PSC_CTS_CTS, addr: MCFGPIO_PAR_PSC2);
59 __raw_writeb(val: MCF_PAR_PSC_TXD | MCF_PAR_PSC_RXD, addr: MCFGPIO_PAR_PSC3);
60}
61
62/***************************************************************************/
63
64static 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(addr: MCF_PAR_FECI2CIRQ);
71 r |= MCF_PAR_FECI2CIRQ_SDA | MCF_PAR_FECI2CIRQ_SCL;
72 writel(val: r, addr: MCF_PAR_FECI2CIRQ);
73#endif /* IS_ENABLED(CONFIG_I2C_IMX) */
74}
75
76/***************************************************************************/
77
78static void mcf54xx_reset(void)
79{
80 /* disable interrupts and enable the watchdog */
81 asm("movew #0x2700, %sr\n");
82 __raw_writel(val: 0, addr: 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
90void __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

source code of linux/arch/m68k/coldfire/m54xx.c