1 /*
2 * linux/arch/arm/mach-integrator/integrator_cp.c
3 *
4 * Copyright (C) 2003 Deep Blue Solutions Ltd
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License.
9 */
10 #include <linux/kernel.h>
11 #include <linux/amba/mmci.h>
12 #include <linux/io.h>
13 #include <linux/irqchip.h>
14 #include <linux/of_irq.h>
15 #include <linux/of_address.h>
16 #include <linux/of_platform.h>
17 #include <linux/sched_clock.h>
18 #include <linux/regmap.h>
19 #include <linux/mfd/syscon.h>
20
21 #include <asm/mach/arch.h>
22 #include <asm/mach/map.h>
23
24 #include "hardware.h"
25 #include "cm.h"
26 #include "common.h"
27
28 /* Base address to the core module header */
29 static struct regmap *cm_map;
30 /* Base address to the CP controller */
31 static void __iomem *intcp_con_base;
32
33 #define CM_COUNTER_OFFSET 0x28
34
35 /*
36 * Logical Physical
37 * f1400000 14000000 Interrupt controller
38 * f1600000 16000000 UART 0
39 * fca00000 ca000000 SIC
40 */
41
42 static struct map_desc intcp_io_desc[] __initdata __maybe_unused = {
43 {
44 .virtual = IO_ADDRESS(INTEGRATOR_IC_BASE),
45 .pfn = __phys_to_pfn(INTEGRATOR_IC_BASE),
46 .length = SZ_4K,
47 .type = MT_DEVICE
48 }, {
49 .virtual = IO_ADDRESS(INTEGRATOR_UART0_BASE),
50 .pfn = __phys_to_pfn(INTEGRATOR_UART0_BASE),
51 .length = SZ_4K,
52 .type = MT_DEVICE
53 }, {
54 .virtual = IO_ADDRESS(INTEGRATOR_CP_SIC_BASE),
55 .pfn = __phys_to_pfn(INTEGRATOR_CP_SIC_BASE),
56 .length = SZ_4K,
57 .type = MT_DEVICE
58 }
59 };
60
intcp_map_io(void)61 static void __init intcp_map_io(void)
62 {
63 iotable_init(intcp_io_desc, ARRAY_SIZE(intcp_io_desc));
64 }
65
66 /*
67 * It seems that the card insertion interrupt remains active after
68 * we've acknowledged it. We therefore ignore the interrupt, and
69 * rely on reading it from the SIC. This also means that we must
70 * clear the latched interrupt.
71 */
mmc_status(struct device * dev)72 static unsigned int mmc_status(struct device *dev)
73 {
74 unsigned int status = readl(__io_address(0xca000000 + 4));
75 writel(8, intcp_con_base + 8);
76
77 return status & 8;
78 }
79
80 static struct mmci_platform_data mmc_data = {
81 .ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
82 .status = mmc_status,
83 .gpio_wp = -1,
84 .gpio_cd = -1,
85 };
86
intcp_read_sched_clock(void)87 static u64 notrace intcp_read_sched_clock(void)
88 {
89 unsigned int val;
90
91 /* MMIO so discard return code */
92 regmap_read(cm_map, CM_COUNTER_OFFSET, &val);
93 return val;
94 }
95
intcp_init_early(void)96 static void __init intcp_init_early(void)
97 {
98 cm_map = syscon_regmap_lookup_by_compatible("arm,core-module-integrator");
99 if (IS_ERR(cm_map))
100 return;
101 sched_clock_register(intcp_read_sched_clock, 32, 24000000);
102 }
103
intcp_init_irq_of(void)104 static void __init intcp_init_irq_of(void)
105 {
106 cm_init();
107 irqchip_init();
108 }
109
110 /*
111 * For the Device Tree, add in the UART, MMC and CLCD specifics as AUXDATA
112 * and enforce the bus names since these are used for clock lookups.
113 */
114 static struct of_dev_auxdata intcp_auxdata_lookup[] __initdata = {
115 OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_CP_MMC_BASE,
116 "mmci", &mmc_data),
117 { /* sentinel */ },
118 };
119
120 static const struct of_device_id intcp_syscon_match[] = {
121 { .compatible = "arm,integrator-cp-syscon"},
122 { },
123 };
124
intcp_init_of(void)125 static void __init intcp_init_of(void)
126 {
127 struct device_node *cpcon;
128
129 cpcon = of_find_matching_node(NULL, intcp_syscon_match);
130 if (!cpcon)
131 return;
132
133 intcp_con_base = of_iomap(cpcon, 0);
134 if (!intcp_con_base)
135 return;
136
137 of_platform_default_populate(NULL, intcp_auxdata_lookup, NULL);
138 }
139
140 static const char * intcp_dt_board_compat[] = {
141 "arm,integrator-cp",
142 NULL,
143 };
144
145 DT_MACHINE_START(INTEGRATOR_CP_DT, "ARM Integrator/CP (Device Tree)")
146 .reserve = integrator_reserve,
147 .map_io = intcp_map_io,
148 .init_early = intcp_init_early,
149 .init_irq = intcp_init_irq_of,
150 .init_machine = intcp_init_of,
151 .dt_compat = intcp_dt_board_compat,
152 MACHINE_END
153