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
intcp_map_io(void)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 */
mmc_status(struct device * dev)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
intcp_read_sched_clock(void)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
intcp_init_early(void)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
intcp_init_irq_of(void)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
intcp_init_of(void)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