Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 1 | /* |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 2 | * Copyright (C) 2007-2011 Freescale Semiconductor, Inc. |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 3 | * |
| 4 | * Author: Tony Li <tony.li@freescale.com> |
| 5 | * Jason Jin <Jason.jin@freescale.com> |
| 6 | * |
| 7 | * The hwirq alloc and free code reuse from sysdev/mpic_msi.c |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License |
| 11 | * as published by the Free Software Foundation; version 2 of the |
| 12 | * License. |
| 13 | * |
| 14 | */ |
| 15 | #include <linux/irq.h> |
| 16 | #include <linux/bootmem.h> |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 17 | #include <linux/msi.h> |
| 18 | #include <linux/pci.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 20 | #include <linux/of_platform.h> |
| 21 | #include <sysdev/fsl_soc.h> |
| 22 | #include <asm/prom.h> |
| 23 | #include <asm/hw_irq.h> |
| 24 | #include <asm/ppc-pci.h> |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 25 | #include <asm/mpic.h> |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 26 | #include "fsl_msi.h" |
Kumar Gala | b8f44ec | 2010-08-05 02:45:08 -0500 | [diff] [blame] | 27 | #include "fsl_pci.h" |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 28 | |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 29 | LIST_HEAD(msi_head); |
| 30 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 31 | struct fsl_msi_feature { |
| 32 | u32 fsl_pic_ip; |
Timur Tabi | 2bcd1c0 | 2011-09-23 12:41:35 -0500 | [diff] [blame] | 33 | u32 msiir_offset; /* Offset of MSIIR, relative to start of MSIR bank */ |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 34 | }; |
| 35 | |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 36 | struct fsl_msi_cascade_data { |
| 37 | struct fsl_msi *msi_data; |
| 38 | int index; |
| 39 | }; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 40 | |
| 41 | static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg) |
| 42 | { |
| 43 | return in_be32(base + (reg >> 2)); |
| 44 | } |
| 45 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 46 | /* |
| 47 | * We do not need this actually. The MSIR register has been read once |
| 48 | * in the cascade interrupt. So, this MSI interrupt has been acked |
| 49 | */ |
Lennert Buytenhek | 37e1661 | 2011-03-07 13:59:54 +0000 | [diff] [blame] | 50 | static void fsl_msi_end_irq(struct irq_data *d) |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 51 | { |
| 52 | } |
| 53 | |
| 54 | static struct irq_chip fsl_msi_chip = { |
Thomas Gleixner | 1c9db52 | 2010-09-28 16:46:51 +0200 | [diff] [blame] | 55 | .irq_mask = mask_msi_irq, |
| 56 | .irq_unmask = unmask_msi_irq, |
Lennert Buytenhek | 37e1661 | 2011-03-07 13:59:54 +0000 | [diff] [blame] | 57 | .irq_ack = fsl_msi_end_irq, |
Anton Blanchard | fc380c0 | 2010-01-31 20:33:41 +0000 | [diff] [blame] | 58 | .name = "FSL-MSI", |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 59 | }; |
| 60 | |
| 61 | static int fsl_msi_host_map(struct irq_host *h, unsigned int virq, |
| 62 | irq_hw_number_t hw) |
| 63 | { |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 64 | struct fsl_msi *msi_data = h->host_data; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 65 | struct irq_chip *chip = &fsl_msi_chip; |
| 66 | |
Thomas Gleixner | 98488db | 2011-03-25 15:43:57 +0100 | [diff] [blame] | 67 | irq_set_status_flags(virq, IRQ_TYPE_EDGE_FALLING); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 68 | |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 69 | irq_set_chip_data(virq, msi_data); |
| 70 | irq_set_chip_and_handler(virq, chip, handle_edge_irq); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static struct irq_host_ops fsl_msi_host_ops = { |
| 76 | .map = fsl_msi_host_map, |
| 77 | }; |
| 78 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 79 | static int fsl_msi_init_allocator(struct fsl_msi *msi_data) |
| 80 | { |
Anton Vorontsov | 692d103 | 2008-05-23 17:41:02 +0400 | [diff] [blame] | 81 | int rc; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 82 | |
Michael Ellerman | 7e7ab36 | 2008-08-06 09:10:02 +1000 | [diff] [blame] | 83 | rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS, |
| 84 | msi_data->irqhost->of_node); |
| 85 | if (rc) |
| 86 | return rc; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 87 | |
Michael Ellerman | 7e7ab36 | 2008-08-06 09:10:02 +1000 | [diff] [blame] | 88 | rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap); |
| 89 | if (rc < 0) { |
| 90 | msi_bitmap_free(&msi_data->bitmap); |
| 91 | return rc; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 92 | } |
| 93 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 94 | return 0; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type) |
| 98 | { |
| 99 | if (type == PCI_CAP_ID_MSIX) |
| 100 | pr_debug("fslmsi: MSI-X untested, trying anyway.\n"); |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | static void fsl_teardown_msi_irqs(struct pci_dev *pdev) |
| 106 | { |
| 107 | struct msi_desc *entry; |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 108 | struct fsl_msi *msi_data; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 109 | |
| 110 | list_for_each_entry(entry, &pdev->msi_list, list) { |
| 111 | if (entry->irq == NO_IRQ) |
| 112 | continue; |
Milton Miller | d1921bc | 2011-05-10 19:30:11 +0000 | [diff] [blame] | 113 | msi_data = irq_get_chip_data(entry->irq); |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 114 | irq_set_msi_desc(entry->irq, NULL); |
Michael Ellerman | 7e7ab36 | 2008-08-06 09:10:02 +1000 | [diff] [blame] | 115 | msi_bitmap_free_hwirqs(&msi_data->bitmap, |
| 116 | virq_to_hw(entry->irq), 1); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 117 | irq_dispose_mapping(entry->irq); |
| 118 | } |
| 119 | |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq, |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 124 | struct msi_msg *msg, |
| 125 | struct fsl_msi *fsl_msi_data) |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 126 | { |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 127 | struct fsl_msi *msi_data = fsl_msi_data; |
Kumar Gala | 3da34aa | 2009-05-12 15:51:56 -0500 | [diff] [blame] | 128 | struct pci_controller *hose = pci_bus_to_host(pdev->bus); |
Timur Tabi | 2bcd1c0 | 2011-09-23 12:41:35 -0500 | [diff] [blame] | 129 | u64 address; /* Physical address of the MSIIR */ |
| 130 | int len; |
| 131 | const u64 *reg; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 132 | |
Timur Tabi | 2bcd1c0 | 2011-09-23 12:41:35 -0500 | [diff] [blame] | 133 | /* If the msi-address-64 property exists, then use it */ |
| 134 | reg = of_get_property(hose->dn, "msi-address-64", &len); |
| 135 | if (reg && (len == sizeof(u64))) |
| 136 | address = be64_to_cpup(reg); |
| 137 | else |
| 138 | address = fsl_pci_immrbar_base(hose) + msi_data->msiir_offset; |
| 139 | |
| 140 | msg->address_lo = lower_32_bits(address); |
| 141 | msg->address_hi = upper_32_bits(address); |
Kumar Gala | 3da34aa | 2009-05-12 15:51:56 -0500 | [diff] [blame] | 142 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 143 | msg->data = hwirq; |
| 144 | |
| 145 | pr_debug("%s: allocated srs: %d, ibs: %d\n", |
| 146 | __func__, hwirq / IRQS_PER_MSI_REG, hwirq % IRQS_PER_MSI_REG); |
| 147 | } |
| 148 | |
| 149 | static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) |
| 150 | { |
Timur Tabi | 895d603 | 2011-10-31 17:06:35 -0500 | [diff] [blame^] | 151 | struct pci_controller *hose = pci_bus_to_host(pdev->bus); |
| 152 | struct device_node *np; |
| 153 | phandle phandle = 0; |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 154 | int rc, hwirq = -ENOMEM; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 155 | unsigned int virq; |
| 156 | struct msi_desc *entry; |
| 157 | struct msi_msg msg; |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 158 | struct fsl_msi *msi_data; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 159 | |
Timur Tabi | 895d603 | 2011-10-31 17:06:35 -0500 | [diff] [blame^] | 160 | /* |
| 161 | * If the PCI node has an fsl,msi property, then we need to use it |
| 162 | * to find the specific MSI. |
| 163 | */ |
| 164 | np = of_parse_phandle(hose->dn, "fsl,msi", 0); |
| 165 | if (np) { |
| 166 | if (of_device_is_compatible(np, "fsl,mpic-msi")) |
| 167 | phandle = np->phandle; |
| 168 | else { |
| 169 | dev_err(&pdev->dev, "node %s has an invalid fsl,msi" |
| 170 | " phandle\n", hose->dn->full_name); |
| 171 | return -EINVAL; |
| 172 | } |
| 173 | } |
| 174 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 175 | list_for_each_entry(entry, &pdev->msi_list, list) { |
Timur Tabi | 895d603 | 2011-10-31 17:06:35 -0500 | [diff] [blame^] | 176 | /* |
| 177 | * Loop over all the MSI devices until we find one that has an |
| 178 | * available interrupt. |
| 179 | */ |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 180 | list_for_each_entry(msi_data, &msi_head, list) { |
Timur Tabi | 895d603 | 2011-10-31 17:06:35 -0500 | [diff] [blame^] | 181 | /* |
| 182 | * If the PCI node has an fsl,msi property, then we |
| 183 | * restrict our search to the corresponding MSI node. |
| 184 | * The simplest way is to skip over MSI nodes with the |
| 185 | * wrong phandle. Under the Freescale hypervisor, this |
| 186 | * has the additional benefit of skipping over MSI |
| 187 | * nodes that are not mapped in the PAMU. |
| 188 | */ |
| 189 | if (phandle && (phandle != msi_data->phandle)) |
| 190 | continue; |
| 191 | |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 192 | hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1); |
| 193 | if (hwirq >= 0) |
| 194 | break; |
| 195 | } |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 196 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 197 | if (hwirq < 0) { |
| 198 | rc = hwirq; |
| 199 | pr_debug("%s: fail allocating msi interrupt\n", |
| 200 | __func__); |
| 201 | goto out_free; |
| 202 | } |
| 203 | |
| 204 | virq = irq_create_mapping(msi_data->irqhost, hwirq); |
| 205 | |
| 206 | if (virq == NO_IRQ) { |
Michael Ellerman | 7e7ab36 | 2008-08-06 09:10:02 +1000 | [diff] [blame] | 207 | pr_debug("%s: fail mapping hwirq 0x%x\n", |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 208 | __func__, hwirq); |
Michael Ellerman | 7e7ab36 | 2008-08-06 09:10:02 +1000 | [diff] [blame] | 209 | msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 210 | rc = -ENOSPC; |
| 211 | goto out_free; |
| 212 | } |
Milton Miller | d1921bc | 2011-05-10 19:30:11 +0000 | [diff] [blame] | 213 | /* chip_data is msi_data via host->hostdata in host->map() */ |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 214 | irq_set_msi_desc(virq, entry); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 215 | |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 216 | fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 217 | write_msi_msg(virq, &msg); |
| 218 | } |
| 219 | return 0; |
| 220 | |
| 221 | out_free: |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 222 | /* free by the caller of this function */ |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 223 | return rc; |
| 224 | } |
| 225 | |
Anton Vorontsov | 692d103 | 2008-05-23 17:41:02 +0400 | [diff] [blame] | 226 | static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc) |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 227 | { |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 228 | struct irq_chip *chip = irq_desc_get_chip(desc); |
| 229 | struct irq_data *idata = irq_desc_get_irq_data(desc); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 230 | unsigned int cascade_irq; |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 231 | struct fsl_msi *msi_data; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 232 | int msir_index = -1; |
| 233 | u32 msir_value = 0; |
| 234 | u32 intr_index; |
| 235 | u32 have_shift = 0; |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 236 | struct fsl_msi_cascade_data *cascade_data; |
| 237 | |
Milton Miller | d1921bc | 2011-05-10 19:30:11 +0000 | [diff] [blame] | 238 | cascade_data = irq_get_handler_data(irq); |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 239 | msi_data = cascade_data->msi_data; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 240 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 241 | raw_spin_lock(&desc->lock); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 242 | if ((msi_data->feature & FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) { |
Lennert Buytenhek | 37e1661 | 2011-03-07 13:59:54 +0000 | [diff] [blame] | 243 | if (chip->irq_mask_ack) |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 244 | chip->irq_mask_ack(idata); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 245 | else { |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 246 | chip->irq_mask(idata); |
| 247 | chip->irq_ack(idata); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 248 | } |
| 249 | } |
| 250 | |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 251 | if (unlikely(irqd_irq_inprogress(idata))) |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 252 | goto unlock; |
| 253 | |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 254 | msir_index = cascade_data->index; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 255 | |
| 256 | if (msir_index >= NR_MSI_REG) |
| 257 | cascade_irq = NO_IRQ; |
| 258 | |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 259 | irqd_set_chained_irq_inprogress(idata); |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 260 | switch (msi_data->feature & FSL_PIC_IP_MASK) { |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 261 | case FSL_PIC_IP_MPIC: |
| 262 | msir_value = fsl_msi_read(msi_data->msi_regs, |
| 263 | msir_index * 0x10); |
| 264 | break; |
| 265 | case FSL_PIC_IP_IPIC: |
| 266 | msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4); |
| 267 | break; |
| 268 | } |
| 269 | |
| 270 | while (msir_value) { |
| 271 | intr_index = ffs(msir_value) - 1; |
| 272 | |
| 273 | cascade_irq = irq_linear_revmap(msi_data->irqhost, |
Anton Vorontsov | 692d103 | 2008-05-23 17:41:02 +0400 | [diff] [blame] | 274 | msir_index * IRQS_PER_MSI_REG + |
| 275 | intr_index + have_shift); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 276 | if (cascade_irq != NO_IRQ) |
| 277 | generic_handle_irq(cascade_irq); |
Anton Vorontsov | 692d103 | 2008-05-23 17:41:02 +0400 | [diff] [blame] | 278 | have_shift += intr_index + 1; |
| 279 | msir_value = msir_value >> (intr_index + 1); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 280 | } |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 281 | irqd_clr_chained_irq_inprogress(idata); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 282 | |
| 283 | switch (msi_data->feature & FSL_PIC_IP_MASK) { |
| 284 | case FSL_PIC_IP_MPIC: |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 285 | chip->irq_eoi(idata); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 286 | break; |
| 287 | case FSL_PIC_IP_IPIC: |
Thomas Gleixner | ddaedd1 | 2011-03-28 16:46:02 +0200 | [diff] [blame] | 288 | if (!irqd_irq_disabled(idata) && chip->irq_unmask) |
| 289 | chip->irq_unmask(idata); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 290 | break; |
| 291 | } |
| 292 | unlock: |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 293 | raw_spin_unlock(&desc->lock); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 294 | } |
| 295 | |
Grant Likely | a454dc5 | 2010-07-22 15:52:34 -0600 | [diff] [blame] | 296 | static int fsl_of_msi_remove(struct platform_device *ofdev) |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 297 | { |
Milton Miller | 6c4c82e | 2011-05-10 19:30:07 +0000 | [diff] [blame] | 298 | struct fsl_msi *msi = platform_get_drvdata(ofdev); |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 299 | int virq, i; |
| 300 | struct fsl_msi_cascade_data *cascade_data; |
| 301 | |
| 302 | if (msi->list.prev != NULL) |
| 303 | list_del(&msi->list); |
| 304 | for (i = 0; i < NR_MSI_REG; i++) { |
| 305 | virq = msi->msi_virqs[i]; |
| 306 | if (virq != NO_IRQ) { |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 307 | cascade_data = irq_get_handler_data(virq); |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 308 | kfree(cascade_data); |
| 309 | irq_dispose_mapping(virq); |
| 310 | } |
| 311 | } |
| 312 | if (msi->bitmap.bitmap) |
| 313 | msi_bitmap_free(&msi->bitmap); |
| 314 | iounmap(msi->msi_regs); |
| 315 | kfree(msi); |
| 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 320 | static int __devinit fsl_msi_setup_hwirq(struct fsl_msi *msi, |
| 321 | struct platform_device *dev, |
| 322 | int offset, int irq_index) |
| 323 | { |
| 324 | struct fsl_msi_cascade_data *cascade_data = NULL; |
| 325 | int virt_msir; |
| 326 | |
| 327 | virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index); |
| 328 | if (virt_msir == NO_IRQ) { |
| 329 | dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n", |
| 330 | __func__, irq_index); |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | cascade_data = kzalloc(sizeof(struct fsl_msi_cascade_data), GFP_KERNEL); |
| 335 | if (!cascade_data) { |
| 336 | dev_err(&dev->dev, "No memory for MSI cascade data\n"); |
| 337 | return -ENOMEM; |
| 338 | } |
| 339 | |
| 340 | msi->msi_virqs[irq_index] = virt_msir; |
Timur Tabi | 2228511 | 2011-09-13 16:17:00 -0500 | [diff] [blame] | 341 | cascade_data->index = offset; |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 342 | cascade_data->msi_data = msi; |
Thomas Gleixner | ec775d0 | 2011-03-25 16:45:20 +0100 | [diff] [blame] | 343 | irq_set_handler_data(virt_msir, cascade_data); |
| 344 | irq_set_chained_handler(virt_msir, fsl_msi_cascade); |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 345 | |
| 346 | return 0; |
| 347 | } |
| 348 | |
Grant Likely | b1608d6 | 2011-05-18 11:19:24 -0600 | [diff] [blame] | 349 | static const struct of_device_id fsl_of_msi_ids[]; |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 350 | static int __devinit fsl_of_msi_probe(struct platform_device *dev) |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 351 | { |
Grant Likely | b1608d6 | 2011-05-18 11:19:24 -0600 | [diff] [blame] | 352 | const struct of_device_id *match; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 353 | struct fsl_msi *msi; |
| 354 | struct resource res; |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 355 | int err, i, j, irq_index, count; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 356 | int rc; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 357 | const u32 *p; |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 358 | struct fsl_msi_feature *features; |
Li Yang | 061ca4a | 2010-04-22 16:31:37 +0800 | [diff] [blame] | 359 | int len; |
| 360 | u32 offset; |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 361 | static const u32 all_avail[] = { 0, NR_MSI_IRQS }; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 362 | |
Grant Likely | b1608d6 | 2011-05-18 11:19:24 -0600 | [diff] [blame] | 363 | match = of_match_device(fsl_of_msi_ids, &dev->dev); |
| 364 | if (!match) |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 365 | return -EINVAL; |
Grant Likely | b1608d6 | 2011-05-18 11:19:24 -0600 | [diff] [blame] | 366 | features = match->data; |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 367 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 368 | printk(KERN_DEBUG "Setting up Freescale MSI support\n"); |
| 369 | |
| 370 | msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL); |
| 371 | if (!msi) { |
| 372 | dev_err(&dev->dev, "No memory for MSI structure\n"); |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 373 | return -ENOMEM; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 374 | } |
Milton Miller | 6c4c82e | 2011-05-10 19:30:07 +0000 | [diff] [blame] | 375 | platform_set_drvdata(dev, msi); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 376 | |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 377 | msi->irqhost = irq_alloc_host(dev->dev.of_node, IRQ_HOST_MAP_LINEAR, |
Michael Ellerman | 611cd90 | 2008-08-06 09:10:00 +1000 | [diff] [blame] | 378 | NR_MSI_IRQS, &fsl_msi_host_ops, 0); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 379 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 380 | if (msi->irqhost == NULL) { |
| 381 | dev_err(&dev->dev, "No memory for MSI irqhost\n"); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 382 | err = -ENOMEM; |
| 383 | goto error_out; |
| 384 | } |
| 385 | |
| 386 | /* Get the MSI reg base */ |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 387 | err = of_address_to_resource(dev->dev.of_node, 0, &res); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 388 | if (err) { |
| 389 | dev_err(&dev->dev, "%s resource error!\n", |
Grant Likely | 61c7a08 | 2010-04-13 16:12:29 -0700 | [diff] [blame] | 390 | dev->dev.of_node->full_name); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 391 | goto error_out; |
| 392 | } |
| 393 | |
Joe Perches | 28f65c11 | 2011-06-09 09:13:32 -0700 | [diff] [blame] | 394 | msi->msi_regs = ioremap(res.start, resource_size(&res)); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 395 | if (!msi->msi_regs) { |
| 396 | dev_err(&dev->dev, "ioremap problem failed\n"); |
| 397 | goto error_out; |
| 398 | } |
| 399 | |
Anton Vorontsov | 692d103 | 2008-05-23 17:41:02 +0400 | [diff] [blame] | 400 | msi->feature = features->fsl_pic_ip; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 401 | |
| 402 | msi->irqhost->host_data = msi; |
| 403 | |
Timur Tabi | 2bcd1c0 | 2011-09-23 12:41:35 -0500 | [diff] [blame] | 404 | msi->msiir_offset = features->msiir_offset + (res.start & 0xfffff); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 405 | |
Timur Tabi | 895d603 | 2011-10-31 17:06:35 -0500 | [diff] [blame^] | 406 | /* |
| 407 | * Remember the phandle, so that we can match with any PCI nodes |
| 408 | * that have an "fsl,msi" property. |
| 409 | */ |
| 410 | msi->phandle = dev->dev.of_node->phandle; |
| 411 | |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 412 | rc = fsl_msi_init_allocator(msi); |
| 413 | if (rc) { |
| 414 | dev_err(&dev->dev, "Error allocating MSI bitmap\n"); |
| 415 | goto error_out; |
| 416 | } |
| 417 | |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 418 | p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len); |
| 419 | if (p && len % (2 * sizeof(u32)) != 0) { |
| 420 | dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n", |
| 421 | __func__); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 422 | err = -EINVAL; |
| 423 | goto error_out; |
| 424 | } |
| 425 | |
Timur Tabi | 2228511 | 2011-09-13 16:17:00 -0500 | [diff] [blame] | 426 | if (!p) { |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 427 | p = all_avail; |
Timur Tabi | 2228511 | 2011-09-13 16:17:00 -0500 | [diff] [blame] | 428 | len = sizeof(all_avail); |
| 429 | } |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 430 | |
| 431 | for (irq_index = 0, i = 0; i < len / (2 * sizeof(u32)); i++) { |
| 432 | if (p[i * 2] % IRQS_PER_MSI_REG || |
| 433 | p[i * 2 + 1] % IRQS_PER_MSI_REG) { |
| 434 | printk(KERN_WARNING "%s: %s: msi available range of %u at %u is not IRQ-aligned\n", |
| 435 | __func__, dev->dev.of_node->full_name, |
| 436 | p[i * 2 + 1], p[i * 2]); |
| 437 | err = -EINVAL; |
| 438 | goto error_out; |
| 439 | } |
| 440 | |
| 441 | offset = p[i * 2] / IRQS_PER_MSI_REG; |
| 442 | count = p[i * 2 + 1] / IRQS_PER_MSI_REG; |
| 443 | |
| 444 | for (j = 0; j < count; j++, irq_index++) { |
Timur Tabi | 2228511 | 2011-09-13 16:17:00 -0500 | [diff] [blame] | 445 | err = fsl_msi_setup_hwirq(msi, dev, offset + j, irq_index); |
Scott Wood | 6820fea | 2011-01-17 14:25:28 -0600 | [diff] [blame] | 446 | if (err) |
Li Yang | 02adac6 | 2010-04-22 16:31:35 +0800 | [diff] [blame] | 447 | goto error_out; |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 448 | } |
| 449 | } |
| 450 | |
Li Yang | 694a7a3 | 2010-04-22 16:31:36 +0800 | [diff] [blame] | 451 | list_add_tail(&msi->list, &msi_head); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 452 | |
Lan Chunhe-B25806 | 8081881 | 2010-03-15 06:38:33 +0000 | [diff] [blame] | 453 | /* The multiple setting ppc_md.setup_msi_irqs will not harm things */ |
| 454 | if (!ppc_md.setup_msi_irqs) { |
| 455 | ppc_md.setup_msi_irqs = fsl_setup_msi_irqs; |
| 456 | ppc_md.teardown_msi_irqs = fsl_teardown_msi_irqs; |
| 457 | ppc_md.msi_check_device = fsl_msi_check_device; |
| 458 | } else if (ppc_md.setup_msi_irqs != fsl_setup_msi_irqs) { |
| 459 | dev_err(&dev->dev, "Different MSI driver already installed!\n"); |
| 460 | err = -ENODEV; |
| 461 | goto error_out; |
| 462 | } |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 463 | return 0; |
| 464 | error_out: |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 465 | fsl_of_msi_remove(dev); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 466 | return err; |
| 467 | } |
| 468 | |
| 469 | static const struct fsl_msi_feature mpic_msi_feature = { |
| 470 | .fsl_pic_ip = FSL_PIC_IP_MPIC, |
| 471 | .msiir_offset = 0x140, |
| 472 | }; |
| 473 | |
| 474 | static const struct fsl_msi_feature ipic_msi_feature = { |
| 475 | .fsl_pic_ip = FSL_PIC_IP_IPIC, |
| 476 | .msiir_offset = 0x38, |
| 477 | }; |
| 478 | |
| 479 | static const struct of_device_id fsl_of_msi_ids[] = { |
| 480 | { |
| 481 | .compatible = "fsl,mpic-msi", |
| 482 | .data = (void *)&mpic_msi_feature, |
| 483 | }, |
| 484 | { |
| 485 | .compatible = "fsl,ipic-msi", |
| 486 | .data = (void *)&ipic_msi_feature, |
| 487 | }, |
| 488 | {} |
| 489 | }; |
| 490 | |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 491 | static struct platform_driver fsl_of_msi_driver = { |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 492 | .driver = { |
| 493 | .name = "fsl-msi", |
| 494 | .owner = THIS_MODULE, |
| 495 | .of_match_table = fsl_of_msi_ids, |
| 496 | }, |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 497 | .probe = fsl_of_msi_probe, |
Li Yang | 4805999 | 2010-04-22 16:31:39 +0800 | [diff] [blame] | 498 | .remove = fsl_of_msi_remove, |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 499 | }; |
| 500 | |
| 501 | static __init int fsl_of_msi_init(void) |
| 502 | { |
Grant Likely | 0000612 | 2011-02-22 19:59:54 -0700 | [diff] [blame] | 503 | return platform_driver_register(&fsl_of_msi_driver); |
Jason Jin | 34e36c1 | 2008-05-23 16:32:46 +0800 | [diff] [blame] | 504 | } |
| 505 | |
| 506 | subsys_initcall(fsl_of_msi_init); |