Merge drm/drm-next into drm-intel-next-queued
[sfrench/cifs-2.6.git] / arch / arm / mach-integrator / integrator_ap.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  linux/arch/arm/mach-integrator/integrator_ap.c
4  *
5  *  Copyright (C) 2000-2003 Deep Blue Solutions Ltd
6  */
7 #include <linux/kernel.h>
8 #include <linux/init.h>
9 #include <linux/syscore_ops.h>
10 #include <linux/amba/bus.h>
11 #include <linux/io.h>
12 #include <linux/irqchip.h>
13 #include <linux/of_irq.h>
14 #include <linux/of_address.h>
15 #include <linux/of_platform.h>
16 #include <linux/termios.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/regmap.h>
19
20 #include <asm/mach/arch.h>
21 #include <asm/mach/map.h>
22
23 #include "hardware.h"
24 #include "cm.h"
25 #include "common.h"
26 #include "lm.h"
27
28 /* Regmap to the AP system controller */
29 static struct regmap *ap_syscon_map;
30
31 /*
32  * All IO addresses are mapped onto VA 0xFFFx.xxxx, where x.xxxx
33  * is the (PA >> 12).
34  *
35  * Setup a VA for the Integrator interrupt controller (for header #0,
36  * just for now).
37  */
38 #define VA_IC_BASE      __io_address(INTEGRATOR_IC_BASE)
39
40 /*
41  * Logical      Physical
42  * f1400000     14000000        Interrupt controller
43  * f1600000     16000000        UART 0
44  */
45
46 static struct map_desc ap_io_desc[] __initdata __maybe_unused = {
47         {
48                 .virtual        = IO_ADDRESS(INTEGRATOR_IC_BASE),
49                 .pfn            = __phys_to_pfn(INTEGRATOR_IC_BASE),
50                 .length         = SZ_4K,
51                 .type           = MT_DEVICE
52         }, {
53                 .virtual        = IO_ADDRESS(INTEGRATOR_UART0_BASE),
54                 .pfn            = __phys_to_pfn(INTEGRATOR_UART0_BASE),
55                 .length         = SZ_4K,
56                 .type           = MT_DEVICE
57         }
58 };
59
60 static void __init ap_map_io(void)
61 {
62         iotable_init(ap_io_desc, ARRAY_SIZE(ap_io_desc));
63 }
64
65 #ifdef CONFIG_PM
66 static unsigned long ic_irq_enable;
67
68 static int irq_suspend(void)
69 {
70         ic_irq_enable = readl(VA_IC_BASE + IRQ_ENABLE);
71         return 0;
72 }
73
74 static void irq_resume(void)
75 {
76         /* disable all irq sources */
77         cm_clear_irqs();
78         writel(-1, VA_IC_BASE + IRQ_ENABLE_CLEAR);
79         writel(-1, VA_IC_BASE + FIQ_ENABLE_CLEAR);
80
81         writel(ic_irq_enable, VA_IC_BASE + IRQ_ENABLE_SET);
82 }
83 #else
84 #define irq_suspend NULL
85 #define irq_resume NULL
86 #endif
87
88 static struct syscore_ops irq_syscore_ops = {
89         .suspend        = irq_suspend,
90         .resume         = irq_resume,
91 };
92
93 static int __init irq_syscore_init(void)
94 {
95         register_syscore_ops(&irq_syscore_ops);
96
97         return 0;
98 }
99
100 device_initcall(irq_syscore_init);
101
102 /*
103  * For the PL010 found in the Integrator/AP some of the UART control is
104  * implemented in the system controller and accessed using a callback
105  * from the driver.
106  */
107 static void integrator_uart_set_mctrl(struct amba_device *dev,
108                                 void __iomem *base, unsigned int mctrl)
109 {
110         unsigned int ctrls = 0, ctrlc = 0, rts_mask, dtr_mask;
111         u32 phybase = dev->res.start;
112         int ret;
113
114         if (phybase == INTEGRATOR_UART0_BASE) {
115                 /* UART0 */
116                 rts_mask = 1 << 4;
117                 dtr_mask = 1 << 5;
118         } else {
119                 /* UART1 */
120                 rts_mask = 1 << 6;
121                 dtr_mask = 1 << 7;
122         }
123
124         if (mctrl & TIOCM_RTS)
125                 ctrlc |= rts_mask;
126         else
127                 ctrls |= rts_mask;
128
129         if (mctrl & TIOCM_DTR)
130                 ctrlc |= dtr_mask;
131         else
132                 ctrls |= dtr_mask;
133
134         ret = regmap_write(ap_syscon_map,
135                            INTEGRATOR_SC_CTRLS_OFFSET,
136                            ctrls);
137         if (ret)
138                 pr_err("MODEM: unable to write PL010 UART CTRLS\n");
139
140         ret = regmap_write(ap_syscon_map,
141                            INTEGRATOR_SC_CTRLC_OFFSET,
142                            ctrlc);
143         if (ret)
144                 pr_err("MODEM: unable to write PL010 UART CRTLC\n");
145 }
146
147 struct amba_pl010_data ap_uart_data = {
148         .set_mctrl = integrator_uart_set_mctrl,
149 };
150
151 void __init ap_init_early(void)
152 {
153 }
154
155 static void __init ap_init_irq_of(void)
156 {
157         cm_init();
158         irqchip_init();
159 }
160
161 /* For the Device Tree, add in the UART callbacks as AUXDATA */
162 static struct of_dev_auxdata ap_auxdata_lookup[] __initdata = {
163         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART0_BASE,
164                 "uart0", &ap_uart_data),
165         OF_DEV_AUXDATA("arm,primecell", INTEGRATOR_UART1_BASE,
166                 "uart1", &ap_uart_data),
167         { /* sentinel */ },
168 };
169
170 static const struct of_device_id ap_syscon_match[] = {
171         { .compatible = "arm,integrator-ap-syscon"},
172         { },
173 };
174
175 static void __init ap_init_of(void)
176 {
177         u32 sc_dec;
178         struct device_node *syscon;
179         int ret;
180         int i;
181
182         of_platform_default_populate(NULL, ap_auxdata_lookup, NULL);
183
184         syscon = of_find_matching_node(NULL, ap_syscon_match);
185         if (!syscon)
186                 return;
187         ap_syscon_map = syscon_node_to_regmap(syscon);
188         if (IS_ERR(ap_syscon_map)) {
189                 pr_crit("could not find Integrator/AP system controller\n");
190                 return;
191         }
192
193         ret = regmap_read(ap_syscon_map,
194                           INTEGRATOR_SC_DEC_OFFSET,
195                           &sc_dec);
196         if (ret) {
197                 pr_crit("could not read from Integrator/AP syscon\n");
198                 return;
199         }
200
201         for (i = 0; i < 4; i++) {
202                 struct lm_device *lmdev;
203
204                 if ((sc_dec & (16 << i)) == 0)
205                         continue;
206
207                 lmdev = kzalloc(sizeof(struct lm_device), GFP_KERNEL);
208                 if (!lmdev)
209                         continue;
210
211                 lmdev->resource.start = 0xc0000000 + 0x10000000 * i;
212                 lmdev->resource.end = lmdev->resource.start + 0x0fffffff;
213                 lmdev->resource.flags = IORESOURCE_MEM;
214                 lmdev->irq = irq_of_parse_and_map(syscon, i);
215                 lmdev->id = i;
216
217                 lm_device_register(lmdev);
218         }
219 }
220
221 static const char * ap_dt_board_compat[] = {
222         "arm,integrator-ap",
223         NULL,
224 };
225
226 DT_MACHINE_START(INTEGRATOR_AP_DT, "ARM Integrator/AP (Device Tree)")
227         .reserve        = integrator_reserve,
228         .map_io         = ap_map_io,
229         .init_early     = ap_init_early,
230         .init_irq       = ap_init_irq_of,
231         .init_machine   = ap_init_of,
232         .dt_compat      = ap_dt_board_compat,
233 MACHINE_END