1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Support for 'media5200-platform' compatible boards.
4 *
5 * Copyright (C) 2008 Secret Lab Technologies Ltd.
6 *
7 * Description:
8 * This code implements support for the Freescape Media5200 platform
9 * (built around the MPC5200 SoC).
10 *
11 * Notable characteristic of the Media5200 is the presence of an FPGA
12 * that has all external IRQ lines routed through it. This file implements
13 * a cascaded interrupt controller driver which attaches itself to the
14 * Virtual IRQ subsystem after the primary mpc5200 interrupt controller
15 * is initialized.
16 */
17
18 #undef DEBUG
19
20 #include <linux/irq.h>
21 #include <linux/interrupt.h>
22 #include <linux/io.h>
23 #include <linux/of_address.h>
24 #include <linux/of_irq.h>
25 #include <asm/time.h>
26 #include <asm/machdep.h>
27 #include <asm/mpc52xx.h>
28
29 static const struct of_device_id mpc5200_gpio_ids[] __initconst = {
30 { .compatible = "fsl,mpc5200-gpio", },
31 { .compatible = "mpc5200-gpio", },
32 {}
33 };
34
35 /* FPGA register set */
36 #define MEDIA5200_IRQ_ENABLE (0x40c)
37 #define MEDIA5200_IRQ_STATUS (0x410)
38 #define MEDIA5200_NUM_IRQS (6)
39 #define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS)
40
41 struct media5200_irq {
42 void __iomem *regs;
43 spinlock_t lock;
44 struct irq_domain *irqhost;
45 };
46 struct media5200_irq media5200_irq;
47
48 static void media5200_irq_unmask(struct irq_data *d)
49 {
50 unsigned long flags;
51 u32 val;
52
53 spin_lock_irqsave(&media5200_irq.lock, flags);
54 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
55 val |= 1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d));
56 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val);
57 spin_unlock_irqrestore(&media5200_irq.lock, flags);
58 }
59
60 static void media5200_irq_mask(struct irq_data *d)
61 {
62 unsigned long flags;
63 u32 val;
64
65 spin_lock_irqsave(&media5200_irq.lock, flags);
66 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
67 val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d)));
68 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val);
69 spin_unlock_irqrestore(&media5200_irq.lock, flags);
70 }
71
72 static struct irq_chip media5200_irq_chip = {
73 .name = "Media5200 FPGA",
74 .irq_unmask = media5200_irq_unmask,
75 .irq_mask = media5200_irq_mask,
76 .irq_mask_ack = media5200_irq_mask,
77 };
78
79 static void media5200_irq_cascade(struct irq_desc *desc)
80 {
81 struct irq_chip *chip = irq_desc_get_chip(desc);
82 int val;
83 u32 status, enable;
84
85 /* Mask off the cascaded IRQ */
86 raw_spin_lock(&desc->lock);
87 chip->irq_mask(&desc->irq_data);
88 raw_spin_unlock(&desc->lock);
89
90 /* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs
91 * are pending. 'ffs()' is 1 based */
92 status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE);
93 enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS);
94 val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT);
95 if (val) {
96 generic_handle_domain_irq(media5200_irq.irqhost, val - 1);
97 /* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i\n",
98 * __func__, virq, status, enable, val - 1);
99 */
100 }
101
102 /* Processing done; can reenable the cascade now */
103 raw_spin_lock(&desc->lock);
104 chip->irq_ack(&desc->irq_data);
105 if (!irqd_irq_disabled(&desc->irq_data))
106 chip->irq_unmask(&desc->irq_data);
107 raw_spin_unlock(&desc->lock);
108 }
109
110 static int media5200_irq_map(struct irq_domain *h, unsigned int virq,
111 irq_hw_number_t hw)
112 {
113 pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw);
114 irq_set_chip_data(virq, &media5200_irq);
115 irq_set_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq);
116 irq_set_status_flags(virq, IRQ_LEVEL);
117 return 0;
118 }
119
120 static int media5200_irq_xlate(struct irq_domain *h, struct device_node *ct,
121 const u32 *intspec, unsigned int intsize,
122 irq_hw_number_t *out_hwirq,
123 unsigned int *out_flags)
124 {
125 if (intsize != 2)
126 return -1;
127
128 pr_debug("%s: bank=%i, number=%i\n", __func__, intspec[0], intspec[1]);
129 *out_hwirq = intspec[1];
130 *out_flags = IRQ_TYPE_NONE;
131 return 0;
132 }
133
134 static const struct irq_domain_ops media5200_irq_ops = {
135 .map = media5200_irq_map,
136 .xlate = media5200_irq_xlate,
137 };
138
139 /*
140 * Setup Media5200 IRQ mapping
141 */
142 static void __init media5200_init_irq(void)
143 {
144 struct device_node *fpga_np;
145 int cascade_virq;
146
147 /* First setup the regular MPC5200 interrupt controller */
148 mpc52xx_init_irq();
149
150 /* Now find the FPGA IRQ */
151 fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga");
152 if (!fpga_np)
153 goto out;
154 pr_debug("%s: found fpga node: %pOF\n", __func__, fpga_np);
155
156 media5200_irq.regs = of_iomap(fpga_np, 0);
157 if (!media5200_irq.regs)
158 goto out;
159 pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs);
160
161 cascade_virq = irq_of_parse_and_map(fpga_np, 0);
162 if (!cascade_virq)
163 goto out;
164 pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq);
165
166 /* Disable all FPGA IRQs */
167 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0);
168
169 spin_lock_init(&media5200_irq.lock);
170
171 media5200_irq.irqhost = irq_domain_add_linear(fpga_np,
172 MEDIA5200_NUM_IRQS, &media5200_irq_ops, &media5200_irq);
173 if (!media5200_irq.irqhost)
174 goto out;
175 pr_debug("%s: allocated irqhost\n", __func__);
176
177 of_node_put(fpga_np);
178
179 irq_set_handler_data(cascade_virq, &media5200_irq);
180 irq_set_chained_handler(cascade_virq, media5200_irq_cascade);
181
182 return;
183
184 out:
185 pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n");
186 of_node_put(fpga_np);
187 }
188
189 /*
190 * Setup the architecture
191 */
192 static void __init media5200_setup_arch(void)
193 {
194
195 struct device_node *np;
196 struct mpc52xx_gpio __iomem *gpio;
197 u32 port_config;
198
199 if (ppc_md.progress)
200 ppc_md.progress("media5200_setup_arch()", 0);
201
202 /* Map important registers from the internal memory map */
203 mpc52xx_map_common_devices();
204
205 /* Some mpc5200 & mpc5200b related configuration */
206 mpc5200_setup_xlb_arbiter();
207
208 np = of_find_matching_node(NULL, mpc5200_gpio_ids);
209 gpio = of_iomap(np, 0);
210 of_node_put(np);
211 if (!gpio) {
212 printk(KERN_ERR "%s() failed. expect abnormal behavior\n",
213 __func__);
214 return;
215 }
216
217 /* Set port config */
218 port_config = in_be32(&gpio->port_config);
219
220 port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */
221 port_config |= 0x01000000;
222
223 out_be32(&gpio->port_config, port_config);
224
225 /* Unmap zone */
226 iounmap(gpio);
227
228 }
229
230 define_machine(media5200_platform) {
231 .name = "media5200-platform",
232 .compatible = "fsl,media5200",
233 .setup_arch = media5200_setup_arch,
234 .discover_phbs = mpc52xx_setup_pci,
235 .init = mpc52xx_declare_of_platform_devices,
236 .init_IRQ = media5200_init_irq,
237 .get_irq = mpc52xx_get_irq,
238 .restart = mpc52xx_restart,
239 };
240
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