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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.