Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Adding PCI-E MSI support for PPC4XX SoCs. |
| 3 | * |
| 4 | * Copyright (c) 2010, Applied Micro Circuits Corporation |
| 5 | * Authors: Tirumala R Marri <tmarri@apm.com> |
| 6 | * Feng Kan <fkan@apm.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License as |
| 10 | * published by the Free Software Foundation; either version 2 of |
| 11 | * the License, or (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 21 | * MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/irq.h> |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 25 | #include <linux/pci.h> |
| 26 | #include <linux/msi.h> |
| 27 | #include <linux/of_platform.h> |
| 28 | #include <linux/interrupt.h> |
Paul Gortmaker | 9308794 | 2011-07-29 16:19:31 +1000 | [diff] [blame] | 29 | #include <linux/export.h> |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 30 | #include <linux/kernel.h> |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 31 | #include <asm/prom.h> |
| 32 | #include <asm/hw_irq.h> |
| 33 | #include <asm/ppc-pci.h> |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 34 | #include <asm/dcr.h> |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 35 | #include <asm/dcr-regs.h> |
| 36 | #include <asm/msi_bitmap.h> |
| 37 | |
| 38 | #define PEIH_TERMADH 0x00 |
| 39 | #define PEIH_TERMADL 0x08 |
| 40 | #define PEIH_MSIED 0x10 |
| 41 | #define PEIH_MSIMK 0x18 |
| 42 | #define PEIH_MSIASS 0x20 |
| 43 | #define PEIH_FLUSH0 0x30 |
| 44 | #define PEIH_FLUSH1 0x38 |
| 45 | #define PEIH_CNTRST 0x48 |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 46 | |
| 47 | static int msi_irqs; |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 48 | |
| 49 | struct ppc4xx_msi { |
| 50 | u32 msi_addr_lo; |
| 51 | u32 msi_addr_hi; |
| 52 | void __iomem *msi_regs; |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 53 | int *msi_virqs; |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 54 | struct msi_bitmap bitmap; |
| 55 | struct device_node *msi_dev; |
| 56 | }; |
| 57 | |
| 58 | static struct ppc4xx_msi ppc4xx_msi; |
| 59 | |
| 60 | static int ppc4xx_msi_init_allocator(struct platform_device *dev, |
| 61 | struct ppc4xx_msi *msi_data) |
| 62 | { |
| 63 | int err; |
| 64 | |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 65 | err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs, |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 66 | dev->dev.of_node); |
| 67 | if (err) |
| 68 | return err; |
| 69 | |
| 70 | err = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap); |
| 71 | if (err < 0) { |
| 72 | msi_bitmap_free(&msi_data->bitmap); |
| 73 | return err; |
| 74 | } |
| 75 | |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
| 80 | { |
| 81 | int int_no = -ENOMEM; |
| 82 | unsigned int virq; |
| 83 | struct msi_msg msg; |
| 84 | struct msi_desc *entry; |
| 85 | struct ppc4xx_msi *msi_data = &ppc4xx_msi; |
| 86 | |
Alexander Gordeev | 6b2fd7ef | 2014-09-07 20:57:53 +0200 | [diff] [blame] | 87 | dev_dbg(&dev->dev, "PCIE-MSI:%s called. vec %x type %d\n", |
| 88 | __func__, nvec, type); |
| 89 | if (type == PCI_CAP_ID_MSIX) |
| 90 | pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n"); |
| 91 | |
| 92 | msi_data->msi_virqs = kmalloc((msi_irqs) * sizeof(int), GFP_KERNEL); |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 93 | if (!msi_data->msi_virqs) |
| 94 | return -ENOMEM; |
| 95 | |
Jiang Liu | 2921d17 | 2015-07-09 16:00:38 +0800 | [diff] [blame] | 96 | for_each_pci_msi_entry(entry, dev) { |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 97 | int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1); |
| 98 | if (int_no >= 0) |
| 99 | break; |
| 100 | if (int_no < 0) { |
| 101 | pr_debug("%s: fail allocating msi interrupt\n", |
| 102 | __func__); |
| 103 | } |
| 104 | virq = irq_of_parse_and_map(msi_data->msi_dev, int_no); |
| 105 | if (virq == NO_IRQ) { |
| 106 | dev_err(&dev->dev, "%s: fail mapping irq\n", __func__); |
| 107 | msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1); |
| 108 | return -ENOSPC; |
| 109 | } |
| 110 | dev_dbg(&dev->dev, "%s: virq = %d\n", __func__, virq); |
| 111 | |
| 112 | /* Setup msi address space */ |
| 113 | msg.address_hi = msi_data->msi_addr_hi; |
| 114 | msg.address_lo = msi_data->msi_addr_lo; |
| 115 | |
| 116 | irq_set_msi_desc(virq, entry); |
| 117 | msg.data = int_no; |
Jiang Liu | 83a1891 | 2014-11-09 23:10:34 +0800 | [diff] [blame] | 118 | pci_write_msi_msg(virq, &msg); |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 119 | } |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | void ppc4xx_teardown_msi_irqs(struct pci_dev *dev) |
| 124 | { |
| 125 | struct msi_desc *entry; |
| 126 | struct ppc4xx_msi *msi_data = &ppc4xx_msi; |
Paul Mackerras | e297c93 | 2015-09-10 14:36:21 +1000 | [diff] [blame] | 127 | irq_hw_number_t hwirq; |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 128 | |
| 129 | dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n"); |
| 130 | |
Jiang Liu | 2921d17 | 2015-07-09 16:00:38 +0800 | [diff] [blame] | 131 | for_each_pci_msi_entry(entry, dev) { |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 132 | if (entry->irq == NO_IRQ) |
| 133 | continue; |
Paul Mackerras | e297c93 | 2015-09-10 14:36:21 +1000 | [diff] [blame] | 134 | hwirq = virq_to_hw(entry->irq); |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 135 | irq_set_msi_desc(entry->irq, NULL); |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 136 | irq_dispose_mapping(entry->irq); |
Paul Mackerras | e297c93 | 2015-09-10 14:36:21 +1000 | [diff] [blame] | 137 | msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1); |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 138 | } |
| 139 | } |
| 140 | |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 141 | static int ppc4xx_setup_pcieh_hw(struct platform_device *dev, |
| 142 | struct resource res, struct ppc4xx_msi *msi) |
| 143 | { |
| 144 | const u32 *msi_data; |
| 145 | const u32 *msi_mask; |
| 146 | const u32 *sdr_addr; |
| 147 | dma_addr_t msi_phys; |
| 148 | void *msi_virt; |
| 149 | |
| 150 | sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL); |
| 151 | if (!sdr_addr) |
| 152 | return -1; |
| 153 | |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 154 | mtdcri(SDR0, *sdr_addr, upper_32_bits(res.start)); /*HIGH addr */ |
| 155 | mtdcri(SDR0, *sdr_addr + 1, lower_32_bits(res.start)); /* Low addr */ |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 156 | |
| 157 | msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi"); |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 158 | if (!msi->msi_dev) |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 159 | return -ENODEV; |
| 160 | |
| 161 | msi->msi_regs = of_iomap(msi->msi_dev, 0); |
| 162 | if (!msi->msi_regs) { |
| 163 | dev_err(&dev->dev, "of_iomap problem failed\n"); |
| 164 | return -ENOMEM; |
| 165 | } |
| 166 | dev_dbg(&dev->dev, "PCIE-MSI: msi register mapped 0x%x 0x%x\n", |
| 167 | (u32) (msi->msi_regs + PEIH_TERMADH), (u32) (msi->msi_regs)); |
| 168 | |
| 169 | msi_virt = dma_alloc_coherent(&dev->dev, 64, &msi_phys, GFP_KERNEL); |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 170 | if (!msi_virt) |
| 171 | return -ENOMEM; |
Josh Boyer | dce4c92 | 2012-05-03 20:13:13 -0400 | [diff] [blame] | 172 | msi->msi_addr_hi = upper_32_bits(msi_phys); |
| 173 | msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff); |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 174 | dev_dbg(&dev->dev, "PCIE-MSI: msi address high 0x%x, low 0x%x\n", |
| 175 | msi->msi_addr_hi, msi->msi_addr_lo); |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 176 | |
| 177 | /* Progam the Interrupt handler Termination addr registers */ |
| 178 | out_be32(msi->msi_regs + PEIH_TERMADH, msi->msi_addr_hi); |
| 179 | out_be32(msi->msi_regs + PEIH_TERMADL, msi->msi_addr_lo); |
| 180 | |
| 181 | msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL); |
| 182 | if (!msi_data) |
| 183 | return -1; |
| 184 | msi_mask = of_get_property(dev->dev.of_node, "msi-mask", NULL); |
| 185 | if (!msi_mask) |
| 186 | return -1; |
| 187 | /* Program MSI Expected data and Mask bits */ |
| 188 | out_be32(msi->msi_regs + PEIH_MSIED, *msi_data); |
| 189 | out_be32(msi->msi_regs + PEIH_MSIMK, *msi_mask); |
| 190 | |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 191 | dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys); |
| 192 | |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int ppc4xx_of_msi_remove(struct platform_device *dev) |
| 197 | { |
| 198 | struct ppc4xx_msi *msi = dev->dev.platform_data; |
| 199 | int i; |
| 200 | int virq; |
| 201 | |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 202 | for (i = 0; i < msi_irqs; i++) { |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 203 | virq = msi->msi_virqs[i]; |
| 204 | if (virq != NO_IRQ) |
| 205 | irq_dispose_mapping(virq); |
| 206 | } |
| 207 | |
| 208 | if (msi->bitmap.bitmap) |
| 209 | msi_bitmap_free(&msi->bitmap); |
| 210 | iounmap(msi->msi_regs); |
| 211 | of_node_put(msi->msi_dev); |
| 212 | kfree(msi); |
| 213 | |
| 214 | return 0; |
| 215 | } |
| 216 | |
Greg Kroah-Hartman | cad5cef | 2012-12-21 14:04:10 -0800 | [diff] [blame] | 217 | static int ppc4xx_msi_probe(struct platform_device *dev) |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 218 | { |
| 219 | struct ppc4xx_msi *msi; |
| 220 | struct resource res; |
| 221 | int err = 0; |
Daniel Axtens | b7eba2f | 2015-04-14 14:27:59 +1000 | [diff] [blame] | 222 | struct pci_controller *phb; |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 223 | |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 224 | dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n"); |
| 225 | |
| 226 | msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL); |
| 227 | if (!msi) { |
| 228 | dev_err(&dev->dev, "No memory for MSI structure\n"); |
| 229 | return -ENOMEM; |
| 230 | } |
| 231 | dev->dev.platform_data = msi; |
| 232 | |
| 233 | /* Get MSI ranges */ |
| 234 | err = of_address_to_resource(dev->dev.of_node, 0, &res); |
| 235 | if (err) { |
| 236 | dev_err(&dev->dev, "%s resource error!\n", |
| 237 | dev->dev.of_node->full_name); |
| 238 | goto error_out; |
| 239 | } |
| 240 | |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 241 | msi_irqs = of_irq_count(dev->dev.of_node); |
| 242 | if (!msi_irqs) |
| 243 | return -ENODEV; |
| 244 | |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 245 | if (ppc4xx_setup_pcieh_hw(dev, res, msi)) |
| 246 | goto error_out; |
| 247 | |
| 248 | err = ppc4xx_msi_init_allocator(dev, msi); |
| 249 | if (err) { |
| 250 | dev_err(&dev->dev, "Error allocating MSI bitmap\n"); |
| 251 | goto error_out; |
| 252 | } |
Mai La | 247540b | 2012-03-18 17:59:08 +0000 | [diff] [blame] | 253 | ppc4xx_msi = *msi; |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 254 | |
Daniel Axtens | b7eba2f | 2015-04-14 14:27:59 +1000 | [diff] [blame] | 255 | list_for_each_entry(phb, &hose_list, list_node) { |
| 256 | phb->controller_ops.setup_msi_irqs = ppc4xx_setup_msi_irqs; |
| 257 | phb->controller_ops.teardown_msi_irqs = ppc4xx_teardown_msi_irqs; |
| 258 | } |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 259 | return err; |
| 260 | |
| 261 | error_out: |
| 262 | ppc4xx_of_msi_remove(dev); |
| 263 | return err; |
| 264 | } |
| 265 | static const struct of_device_id ppc4xx_msi_ids[] = { |
| 266 | { |
| 267 | .compatible = "amcc,ppc4xx-msi", |
| 268 | }, |
| 269 | {} |
| 270 | }; |
| 271 | static struct platform_driver ppc4xx_msi_driver = { |
| 272 | .probe = ppc4xx_msi_probe, |
| 273 | .remove = ppc4xx_of_msi_remove, |
| 274 | .driver = { |
| 275 | .name = "ppc4xx-msi", |
Rupjyoti Sarmah | 3fb7933 | 2011-03-29 23:10:24 +0000 | [diff] [blame] | 276 | .of_match_table = ppc4xx_msi_ids, |
| 277 | }, |
| 278 | |
| 279 | }; |
| 280 | |
| 281 | static __init int ppc4xx_msi_init(void) |
| 282 | { |
| 283 | return platform_driver_register(&ppc4xx_msi_driver); |
| 284 | } |
| 285 | |
| 286 | subsys_initcall(ppc4xx_msi_init); |