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 <asm/time.h> 24 #include <asm/prom.h> 25 #include <asm/machdep.h> 26 #include <asm/mpc52xx.h> 27 28 static const struct of_device_id mpc5200_gpio_ids[] __initconst = { 29 { .compatible = "fsl,mpc5200-gpio", }, 30 { .compatible = "mpc5200-gpio", }, 31 {} 32 }; 33 34 /* FPGA register set */ 35 #define MEDIA5200_IRQ_ENABLE (0x40c) 36 #define MEDIA5200_IRQ_STATUS (0x410) 37 #define MEDIA5200_NUM_IRQS (6) 38 #define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS) 39 40 struct media5200_irq { 41 void __iomem *regs; 42 spinlock_t lock; 43 struct irq_domain *irqhost; 44 }; 45 struct media5200_irq media5200_irq; 46 47 static void media5200_irq_unmask(struct irq_data *d) 48 { 49 unsigned long flags; 50 u32 val; 51 52 spin_lock_irqsave(&media5200_irq.lock, flags); 53 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 54 val |= 1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d)); 55 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); 56 spin_unlock_irqrestore(&media5200_irq.lock, flags); 57 } 58 59 static void media5200_irq_mask(struct irq_data *d) 60 { 61 unsigned long flags; 62 u32 val; 63 64 spin_lock_irqsave(&media5200_irq.lock, flags); 65 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 66 val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d))); 67 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); 68 spin_unlock_irqrestore(&media5200_irq.lock, flags); 69 } 70 71 static struct irq_chip media5200_irq_chip = { 72 .name = "Media5200 FPGA", 73 .irq_unmask = media5200_irq_unmask, 74 .irq_mask = media5200_irq_mask, 75 .irq_mask_ack = media5200_irq_mask, 76 }; 77 78 static void media5200_irq_cascade(struct irq_desc *desc) 79 { 80 struct irq_chip *chip = irq_desc_get_chip(desc); 81 int sub_virq, val; 82 u32 status, enable; 83 84 /* Mask off the cascaded IRQ */ 85 raw_spin_lock(&desc->lock); 86 chip->irq_mask(&desc->irq_data); 87 raw_spin_unlock(&desc->lock); 88 89 /* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs 90 * are pending. 'ffs()' is 1 based */ 91 status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 92 enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS); 93 val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT); 94 if (val) { 95 sub_virq = irq_linear_revmap(media5200_irq.irqhost, val - 1); 96 /* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i subvirq=%i\n", 97 * __func__, virq, status, enable, val - 1, sub_virq); 98 */ 99 generic_handle_irq(sub_virq); 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 irq_set_handler_data(cascade_virq, &media5200_irq); 178 irq_set_chained_handler(cascade_virq, media5200_irq_cascade); 179 180 return; 181 182 out: 183 pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n"); 184 } 185 186 /* 187 * Setup the architecture 188 */ 189 static void __init media5200_setup_arch(void) 190 { 191 192 struct device_node *np; 193 struct mpc52xx_gpio __iomem *gpio; 194 u32 port_config; 195 196 if (ppc_md.progress) 197 ppc_md.progress("media5200_setup_arch()", 0); 198 199 /* Map important registers from the internal memory map */ 200 mpc52xx_map_common_devices(); 201 202 /* Some mpc5200 & mpc5200b related configuration */ 203 mpc5200_setup_xlb_arbiter(); 204 205 mpc52xx_setup_pci(); 206 207 np = of_find_matching_node(NULL, mpc5200_gpio_ids); 208 gpio = of_iomap(np, 0); 209 of_node_put(np); 210 if (!gpio) { 211 printk(KERN_ERR "%s() failed. expect abnormal behavior\n", 212 __func__); 213 return; 214 } 215 216 /* Set port config */ 217 port_config = in_be32(&gpio->port_config); 218 219 port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */ 220 port_config |= 0x01000000; 221 222 out_be32(&gpio->port_config, port_config); 223 224 /* Unmap zone */ 225 iounmap(gpio); 226 227 } 228 229 /* list of the supported boards */ 230 static const char * const board[] __initconst = { 231 "fsl,media5200", 232 NULL 233 }; 234 235 /* 236 * Called very early, MMU is off, device-tree isn't unflattened 237 */ 238 static int __init media5200_probe(void) 239 { 240 return of_device_compatible_match(of_root, board); 241 } 242 243 define_machine(media5200_platform) { 244 .name = "media5200-platform", 245 .probe = media5200_probe, 246 .setup_arch = media5200_setup_arch, 247 .init = mpc52xx_declare_of_platform_devices, 248 .init_IRQ = media5200_init_irq, 249 .get_irq = mpc52xx_get_irq, 250 .restart = mpc52xx_restart, 251 .calibrate_decr = generic_calibrate_decr, 252 }; 253