1 /* 2 * Platform information definitions. 3 * 4 * Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates 5 * to make in work in arch/powerpc/. Original (c) belongs to Dan Malek. 6 * 7 * Author: Vitaly Bordug <vbordug@ru.mvista.com> 8 * 9 * 1999-2001 (c) Dan Malek <dan@embeddedalley.com> 10 * 2006 (c) MontaVista Software, Inc. 11 * 12 * This file is licensed under the terms of the GNU General Public License 13 * version 2. This program is licensed "as is" without any warranty of any 14 * kind, whether express or implied. 15 */ 16 17 /* The CPM2 internal interrupt controller. It is usually 18 * the only interrupt controller. 19 * There are two 32-bit registers (high/low) for up to 64 20 * possible interrupts. 21 * 22 * Now, the fun starts.....Interrupt Numbers DO NOT MAP 23 * in a simple arithmetic fashion to mask or pending registers. 24 * That is, interrupt 4 does not map to bit position 4. 25 * We create two tables, indexed by vector number, to indicate 26 * which register to use and which bit in the register to use. 27 */ 28 29 #include <linux/stddef.h> 30 #include <linux/sched.h> 31 #include <linux/signal.h> 32 #include <linux/irq.h> 33 34 #include <asm/immap_cpm2.h> 35 #include <asm/mpc8260.h> 36 #include <asm/io.h> 37 #include <asm/prom.h> 38 #include <asm/fs_pd.h> 39 40 #include "cpm2_pic.h" 41 42 /* External IRQS */ 43 #define CPM2_IRQ_EXT1 19 44 #define CPM2_IRQ_EXT7 25 45 46 /* Port C IRQS */ 47 #define CPM2_IRQ_PORTC15 48 48 #define CPM2_IRQ_PORTC0 63 49 50 static intctl_cpm2_t __iomem *cpm2_intctl; 51 52 static struct irq_domain *cpm2_pic_host; 53 static unsigned long ppc_cached_irq_mask[2]; /* 2 32-bit registers */ 54 55 static const u_char irq_to_siureg[] = { 56 1, 1, 1, 1, 1, 1, 1, 1, 57 1, 1, 1, 1, 1, 1, 1, 1, 58 0, 0, 0, 0, 0, 0, 0, 0, 59 0, 0, 0, 0, 0, 0, 0, 0, 60 1, 1, 1, 1, 1, 1, 1, 1, 61 1, 1, 1, 1, 1, 1, 1, 1, 62 0, 0, 0, 0, 0, 0, 0, 0, 63 0, 0, 0, 0, 0, 0, 0, 0 64 }; 65 66 /* bit numbers do not match the docs, these are precomputed so the bit for 67 * a given irq is (1 << irq_to_siubit[irq]) */ 68 static const u_char irq_to_siubit[] = { 69 0, 15, 14, 13, 12, 11, 10, 9, 70 8, 7, 6, 5, 4, 3, 2, 1, 71 2, 1, 0, 14, 13, 12, 11, 10, 72 9, 8, 7, 6, 5, 4, 3, 0, 73 31, 30, 29, 28, 27, 26, 25, 24, 74 23, 22, 21, 20, 19, 18, 17, 16, 75 16, 17, 18, 19, 20, 21, 22, 23, 76 24, 25, 26, 27, 28, 29, 30, 31, 77 }; 78 79 static void cpm2_mask_irq(struct irq_data *d) 80 { 81 int bit, word; 82 unsigned int irq_nr = irqd_to_hwirq(d); 83 84 bit = irq_to_siubit[irq_nr]; 85 word = irq_to_siureg[irq_nr]; 86 87 ppc_cached_irq_mask[word] &= ~(1 << bit); 88 out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]); 89 } 90 91 static void cpm2_unmask_irq(struct irq_data *d) 92 { 93 int bit, word; 94 unsigned int irq_nr = irqd_to_hwirq(d); 95 96 bit = irq_to_siubit[irq_nr]; 97 word = irq_to_siureg[irq_nr]; 98 99 ppc_cached_irq_mask[word] |= 1 << bit; 100 out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]); 101 } 102 103 static void cpm2_ack(struct irq_data *d) 104 { 105 int bit, word; 106 unsigned int irq_nr = irqd_to_hwirq(d); 107 108 bit = irq_to_siubit[irq_nr]; 109 word = irq_to_siureg[irq_nr]; 110 111 out_be32(&cpm2_intctl->ic_sipnrh + word, 1 << bit); 112 } 113 114 static void cpm2_end_irq(struct irq_data *d) 115 { 116 int bit, word; 117 unsigned int irq_nr = irqd_to_hwirq(d); 118 119 bit = irq_to_siubit[irq_nr]; 120 word = irq_to_siureg[irq_nr]; 121 122 ppc_cached_irq_mask[word] |= 1 << bit; 123 out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]); 124 125 /* 126 * Work around large numbers of spurious IRQs on PowerPC 82xx 127 * systems. 128 */ 129 mb(); 130 } 131 132 static int cpm2_set_irq_type(struct irq_data *d, unsigned int flow_type) 133 { 134 unsigned int src = irqd_to_hwirq(d); 135 unsigned int vold, vnew, edibit; 136 137 /* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or 138 * IRQ_TYPE_EDGE_BOTH (default). All others are IRQ_TYPE_EDGE_FALLING 139 * or IRQ_TYPE_LEVEL_LOW (default) 140 */ 141 if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) { 142 if (flow_type == IRQ_TYPE_NONE) 143 flow_type = IRQ_TYPE_EDGE_BOTH; 144 145 if (flow_type != IRQ_TYPE_EDGE_BOTH && 146 flow_type != IRQ_TYPE_EDGE_FALLING) 147 goto err_sense; 148 } else { 149 if (flow_type == IRQ_TYPE_NONE) 150 flow_type = IRQ_TYPE_LEVEL_LOW; 151 152 if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH)) 153 goto err_sense; 154 } 155 156 irqd_set_trigger_type(d, flow_type); 157 if (flow_type & IRQ_TYPE_LEVEL_LOW) 158 __irq_set_handler_locked(d->irq, handle_level_irq); 159 else 160 __irq_set_handler_locked(d->irq, handle_edge_irq); 161 162 /* internal IRQ senses are LEVEL_LOW 163 * EXT IRQ and Port C IRQ senses are programmable 164 */ 165 if (src >= CPM2_IRQ_EXT1 && src <= CPM2_IRQ_EXT7) 166 edibit = (14 - (src - CPM2_IRQ_EXT1)); 167 else 168 if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) 169 edibit = (31 - (CPM2_IRQ_PORTC0 - src)); 170 else 171 return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 172 IRQ_SET_MASK_OK_NOCOPY : -EINVAL; 173 174 vold = in_be32(&cpm2_intctl->ic_siexr); 175 176 if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING) 177 vnew = vold | (1 << edibit); 178 else 179 vnew = vold & ~(1 << edibit); 180 181 if (vold != vnew) 182 out_be32(&cpm2_intctl->ic_siexr, vnew); 183 return IRQ_SET_MASK_OK_NOCOPY; 184 185 err_sense: 186 pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type); 187 return -EINVAL; 188 } 189 190 static struct irq_chip cpm2_pic = { 191 .name = "CPM2 SIU", 192 .irq_mask = cpm2_mask_irq, 193 .irq_unmask = cpm2_unmask_irq, 194 .irq_ack = cpm2_ack, 195 .irq_eoi = cpm2_end_irq, 196 .irq_set_type = cpm2_set_irq_type, 197 .flags = IRQCHIP_EOI_IF_HANDLED, 198 }; 199 200 unsigned int cpm2_get_irq(void) 201 { 202 int irq; 203 unsigned long bits; 204 205 /* For CPM2, read the SIVEC register and shift the bits down 206 * to get the irq number. */ 207 bits = in_be32(&cpm2_intctl->ic_sivec); 208 irq = bits >> 26; 209 210 if (irq == 0) 211 return(-1); 212 return irq_linear_revmap(cpm2_pic_host, irq); 213 } 214 215 static int cpm2_pic_host_map(struct irq_domain *h, unsigned int virq, 216 irq_hw_number_t hw) 217 { 218 pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw); 219 220 irq_set_status_flags(virq, IRQ_LEVEL); 221 irq_set_chip_and_handler(virq, &cpm2_pic, handle_level_irq); 222 return 0; 223 } 224 225 static const struct irq_domain_ops cpm2_pic_host_ops = { 226 .map = cpm2_pic_host_map, 227 .xlate = irq_domain_xlate_onetwocell, 228 }; 229 230 void cpm2_pic_init(struct device_node *node) 231 { 232 int i; 233 234 cpm2_intctl = cpm2_map(im_intctl); 235 236 /* Clear the CPM IRQ controller, in case it has any bits set 237 * from the bootloader 238 */ 239 240 /* Mask out everything */ 241 242 out_be32(&cpm2_intctl->ic_simrh, 0x00000000); 243 out_be32(&cpm2_intctl->ic_simrl, 0x00000000); 244 245 wmb(); 246 247 /* Ack everything */ 248 out_be32(&cpm2_intctl->ic_sipnrh, 0xffffffff); 249 out_be32(&cpm2_intctl->ic_sipnrl, 0xffffffff); 250 wmb(); 251 252 /* Dummy read of the vector */ 253 i = in_be32(&cpm2_intctl->ic_sivec); 254 rmb(); 255 256 /* Initialize the default interrupt mapping priorities, 257 * in case the boot rom changed something on us. 258 */ 259 out_be16(&cpm2_intctl->ic_sicr, 0); 260 out_be32(&cpm2_intctl->ic_scprrh, 0x05309770); 261 out_be32(&cpm2_intctl->ic_scprrl, 0x05309770); 262 263 /* create a legacy host */ 264 cpm2_pic_host = irq_domain_add_linear(node, 64, &cpm2_pic_host_ops, NULL); 265 if (cpm2_pic_host == NULL) { 266 printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n"); 267 return; 268 } 269 } 270