1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  Copyright (C) 2003 Deep Blue Solutions Ltd
4  */
5 #include <linux/kernel.h>
6 #include <linux/amba/mmci.h>
7 #include <linux/io.h>
8 #include <linux/irqchip.h>
9 #include <linux/of_irq.h>
10 #include <linux/of_address.h>
11 #include <linux/of_platform.h>
12 #include <linux/sched_clock.h>
13 #include <linux/regmap.h>
14 #include <linux/mfd/syscon.h>
15 
16 #include <asm/mach/arch.h>
17 #include <asm/mach/map.h>
18 
19 #include "integrator-hardware.h"
20 #include "integrator-cm.h"
21 #include "integrator.h"
22 
23 /* Base address to the core module header */
24 static struct regmap *cm_map;
25 /* Base address to the CP controller */
26 static void __iomem *intcp_con_base;
27 
28 #define CM_COUNTER_OFFSET 0x28
29 
30 /*
31  * Logical      Physical
32  * f1400000	14000000	Interrupt controller
33  * f1600000	16000000	UART 0
34  * fca00000	ca000000	SIC
35  */
36 
37 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
38 	{
39 		.virtual	= IO_ADDRESS(INTEGRATOR_IC_BASE),
40 		.pfn		= __phys_to_pfn(INTEGRATOR_IC_BASE),
41 		.length		= SZ_4K,
42 		.type		= MT_DEVICE
43 	}, {
44 		.virtual	= IO_ADDRESS(INTEGRATOR_UART0_BASE),
45 		.pfn		= __phys_to_pfn(INTEGRATOR_UART0_BASE),
46 		.length		= SZ_4K,
47 		.type		= MT_DEVICE
48 	}, {
49 		.virtual	= IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
50 		.pfn		= __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
51 		.length		= SZ_4K,
52 		.type		= MT_DEVICE
53 	}
54 };
55 
56 static void __init intcp_map_io(void)
57 {
58 	iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
59 }
60 
61 /*
62  * It seems that the card insertion interrupt remains active after
63  * we've acknowledged it.  We therefore ignore the interrupt, and
64  * rely on reading it from the SIC.  This also means that we must
65  * clear the latched interrupt.
66  */
67 static unsigned int mmc_status(struct device *dev)
68 {
69 	unsigned int status = readl(__io_address(0xca000000 + 4));
70 	writel(8, intcp_con_base + 8);
71 
72 	return status & 8;
73 }
74 
75 static struct mmci_platform_data mmc_data = {
76 	.ocr_mask	= MMC_VDD_32_33|MMC_VDD_33_34,
77 	.status		= mmc_status,
78 };
79 
80 static u64 notrace intcp_read_sched_clock(void)
81 {
82 	unsigned int val;
83 
84 	/* MMIO so discard return code */
85 	regmap_read(cm_map, CM_COUNTER_OFFSET, &val);
86 	return val;
87 }
88 
89 static void __init intcp_init_early(void)
90 {
91 	cm_map = syscon_regmap_lookup_by_compatible("arm,core-module-integrator");
92 	if (IS_ERR(cm_map))
93 		return;
94 	sched_clock_register(intcp_read_sched_clock, 32, 24000000);
95 }
96 
97 static void __init intcp_init_irq_of(void)
98 {
99 	cm_init();
100 	irqchip_init();
101 }
102 
103 /*
104  * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
105  * and enforce the bus names since these are used for clock lookups.
106  */
107 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
108 	OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
109 		"mmci", &mmc_data),
110 	{ /* sentinel */ },
111 };
112 
113 static const struct of_device_id intcp_syscon_match[] = {
114 	{ .compatible = "arm,integrator-cp-syscon"},
115 	{ },
116 };
117 
118 static void __init intcp_init_of(void)
119 {
120 	struct device_node *cpcon;
121 
122 	cpcon = of_find_matching_node(NULL, intcp_syscon_match);
123 	if (!cpcon)
124 		return;
125 
126 	intcp_con_base = of_iomap(cpcon, 0);
127 	if (!intcp_con_base)
128 		return;
129 
130 	of_platform_default_populate(NULL, intcp_auxdata_lookup, NULL);
131 }
132 
133 static const char * intcp_dt_board_compat[] = {
134 	"arm,integrator-cp",
135 	NULL,
136 };
137 
138 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
139 	.reserve	= integrator_reserve,
140 	.map_io		= intcp_map_io,
141 	.init_early	= intcp_init_early,
142 	.init_irq	= intcp_init_irq_of,
143 	.init_machine	= intcp_init_of,
144 	.dt_compat      = intcp_dt_board_compat,
145 MACHINE_END
146