1 /* 2 * Support for 'media5200-platform' compatible boards. 3 * 4 * Copyright (C) 2008 Secret Lab Technologies Ltd. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 * Description: 12 * This code implements support for the Freescape Media5200 platform 13 * (built around the MPC5200 SoC). 14 * 15 * Notable characteristic of the Media5200 is the presence of an FPGA 16 * that has all external IRQ lines routed through it. This file implements 17 * a cascaded interrupt controller driver which attaches itself to the 18 * Virtual IRQ subsystem after the primary mpc5200 interrupt controller 19 * is initialized. 20 * 21 */ 22 23 #undef DEBUG 24 25 #include <linux/irq.h> 26 #include <linux/interrupt.h> 27 #include <linux/io.h> 28 #include <asm/time.h> 29 #include <asm/prom.h> 30 #include <asm/machdep.h> 31 #include <asm/mpc52xx.h> 32 33 static struct of_device_id mpc5200_gpio_ids[] __initdata = { 34 { .compatible = "fsl,mpc5200-gpio", }, 35 { .compatible = "mpc5200-gpio", }, 36 {} 37 }; 38 39 /* FPGA register set */ 40 #define MEDIA5200_IRQ_ENABLE (0x40c) 41 #define MEDIA5200_IRQ_STATUS (0x410) 42 #define MEDIA5200_NUM_IRQS (6) 43 #define MEDIA5200_IRQ_SHIFT (32 - MEDIA5200_NUM_IRQS) 44 45 struct media5200_irq { 46 void __iomem *regs; 47 spinlock_t lock; 48 struct irq_domain *irqhost; 49 }; 50 struct media5200_irq media5200_irq; 51 52 static void media5200_irq_unmask(struct irq_data *d) 53 { 54 unsigned long flags; 55 u32 val; 56 57 spin_lock_irqsave(&media5200_irq.lock, flags); 58 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 59 val |= 1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d)); 60 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); 61 spin_unlock_irqrestore(&media5200_irq.lock, flags); 62 } 63 64 static void media5200_irq_mask(struct irq_data *d) 65 { 66 unsigned long flags; 67 u32 val; 68 69 spin_lock_irqsave(&media5200_irq.lock, flags); 70 val = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 71 val &= ~(1 << (MEDIA5200_IRQ_SHIFT + irqd_to_hwirq(d))); 72 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, val); 73 spin_unlock_irqrestore(&media5200_irq.lock, flags); 74 } 75 76 static struct irq_chip media5200_irq_chip = { 77 .name = "Media5200 FPGA", 78 .irq_unmask = media5200_irq_unmask, 79 .irq_mask = media5200_irq_mask, 80 .irq_mask_ack = media5200_irq_mask, 81 }; 82 83 void media5200_irq_cascade(unsigned int virq, struct irq_desc *desc) 84 { 85 struct irq_chip *chip = irq_desc_get_chip(desc); 86 int sub_virq, val; 87 u32 status, enable; 88 89 /* Mask off the cascaded IRQ */ 90 raw_spin_lock(&desc->lock); 91 chip->irq_mask(&desc->irq_data); 92 raw_spin_unlock(&desc->lock); 93 94 /* Ask the FPGA for IRQ status. If 'val' is 0, then no irqs 95 * are pending. 'ffs()' is 1 based */ 96 status = in_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE); 97 enable = in_be32(media5200_irq.regs + MEDIA5200_IRQ_STATUS); 98 val = ffs((status & enable) >> MEDIA5200_IRQ_SHIFT); 99 if (val) { 100 sub_virq = irq_linear_revmap(media5200_irq.irqhost, val - 1); 101 /* pr_debug("%s: virq=%i s=%.8x e=%.8x hwirq=%i subvirq=%i\n", 102 * __func__, virq, status, enable, val - 1, sub_virq); 103 */ 104 generic_handle_irq(sub_virq); 105 } 106 107 /* Processing done; can reenable the cascade now */ 108 raw_spin_lock(&desc->lock); 109 chip->irq_ack(&desc->irq_data); 110 if (!irqd_irq_disabled(&desc->irq_data)) 111 chip->irq_unmask(&desc->irq_data); 112 raw_spin_unlock(&desc->lock); 113 } 114 115 static int media5200_irq_map(struct irq_domain *h, unsigned int virq, 116 irq_hw_number_t hw) 117 { 118 pr_debug("%s: h=%p, virq=%i, hwirq=%i\n", __func__, h, virq, (int)hw); 119 irq_set_chip_data(virq, &media5200_irq); 120 irq_set_chip_and_handler(virq, &media5200_irq_chip, handle_level_irq); 121 irq_set_status_flags(virq, IRQ_LEVEL); 122 return 0; 123 } 124 125 static int media5200_irq_xlate(struct irq_domain *h, struct device_node *ct, 126 const u32 *intspec, unsigned int intsize, 127 irq_hw_number_t *out_hwirq, 128 unsigned int *out_flags) 129 { 130 if (intsize != 2) 131 return -1; 132 133 pr_debug("%s: bank=%i, number=%i\n", __func__, intspec[0], intspec[1]); 134 *out_hwirq = intspec[1]; 135 *out_flags = IRQ_TYPE_NONE; 136 return 0; 137 } 138 139 static const struct irq_domain_ops media5200_irq_ops = { 140 .map = media5200_irq_map, 141 .xlate = media5200_irq_xlate, 142 }; 143 144 /* 145 * Setup Media5200 IRQ mapping 146 */ 147 static void __init media5200_init_irq(void) 148 { 149 struct device_node *fpga_np; 150 int cascade_virq; 151 152 /* First setup the regular MPC5200 interrupt controller */ 153 mpc52xx_init_irq(); 154 155 /* Now find the FPGA IRQ */ 156 fpga_np = of_find_compatible_node(NULL, NULL, "fsl,media5200-fpga"); 157 if (!fpga_np) 158 goto out; 159 pr_debug("%s: found fpga node: %s\n", __func__, fpga_np->full_name); 160 161 media5200_irq.regs = of_iomap(fpga_np, 0); 162 if (!media5200_irq.regs) 163 goto out; 164 pr_debug("%s: mapped to %p\n", __func__, media5200_irq.regs); 165 166 cascade_virq = irq_of_parse_and_map(fpga_np, 0); 167 if (!cascade_virq) 168 goto out; 169 pr_debug("%s: cascaded on virq=%i\n", __func__, cascade_virq); 170 171 /* Disable all FPGA IRQs */ 172 out_be32(media5200_irq.regs + MEDIA5200_IRQ_ENABLE, 0); 173 174 spin_lock_init(&media5200_irq.lock); 175 176 media5200_irq.irqhost = irq_domain_add_linear(fpga_np, 177 MEDIA5200_NUM_IRQS, &media5200_irq_ops, &media5200_irq); 178 if (!media5200_irq.irqhost) 179 goto out; 180 pr_debug("%s: allocated irqhost\n", __func__); 181 182 irq_set_handler_data(cascade_virq, &media5200_irq); 183 irq_set_chained_handler(cascade_virq, media5200_irq_cascade); 184 185 return; 186 187 out: 188 pr_err("Could not find Media5200 FPGA; PCI interrupts will not work\n"); 189 } 190 191 /* 192 * Setup the architecture 193 */ 194 static void __init media5200_setup_arch(void) 195 { 196 197 struct device_node *np; 198 struct mpc52xx_gpio __iomem *gpio; 199 u32 port_config; 200 201 if (ppc_md.progress) 202 ppc_md.progress("media5200_setup_arch()", 0); 203 204 /* Map important registers from the internal memory map */ 205 mpc52xx_map_common_devices(); 206 207 /* Some mpc5200 & mpc5200b related configuration */ 208 mpc5200_setup_xlb_arbiter(); 209 210 mpc52xx_setup_pci(); 211 212 np = of_find_matching_node(NULL, mpc5200_gpio_ids); 213 gpio = of_iomap(np, 0); 214 of_node_put(np); 215 if (!gpio) { 216 printk(KERN_ERR "%s() failed. expect abnormal behavior\n", 217 __func__); 218 return; 219 } 220 221 /* Set port config */ 222 port_config = in_be32(&gpio->port_config); 223 224 port_config &= ~0x03000000; /* ATA CS is on csb_4/5 */ 225 port_config |= 0x01000000; 226 227 out_be32(&gpio->port_config, port_config); 228 229 /* Unmap zone */ 230 iounmap(gpio); 231 232 } 233 234 /* list of the supported boards */ 235 static const char * const board[] __initconst = { 236 "fsl,media5200", 237 NULL 238 }; 239 240 /* 241 * Called very early, MMU is off, device-tree isn't unflattened 242 */ 243 static int __init media5200_probe(void) 244 { 245 return of_flat_dt_match(of_get_flat_dt_root(), board); 246 } 247 248 define_machine(media5200_platform) { 249 .name = "media5200-platform", 250 .probe = media5200_probe, 251 .setup_arch = media5200_setup_arch, 252 .init = mpc52xx_declare_of_platform_devices, 253 .init_IRQ = media5200_init_irq, 254 .get_irq = mpc52xx_get_irq, 255 .restart = mpc52xx_restart, 256 .calibrate_decr = generic_calibrate_decr, 257 }; 258