David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 6 | * Copyright (C) 2005-2009, 2010 Cavium Networks |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 7 | */ |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/msi.h> |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | |
| 14 | #include <asm/octeon/octeon.h> |
| 15 | #include <asm/octeon/cvmx-npi-defs.h> |
| 16 | #include <asm/octeon/cvmx-pci-defs.h> |
| 17 | #include <asm/octeon/cvmx-npei-defs.h> |
Eunbong Song | d19648d | 2014-04-11 08:32:54 +0000 | [diff] [blame] | 18 | #include <asm/octeon/cvmx-sli-defs.h> |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 19 | #include <asm/octeon/cvmx-pexp-defs.h> |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 20 | #include <asm/octeon/pci-octeon.h> |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 21 | |
| 22 | /* |
| 23 | * Each bit in msi_free_irq_bitmask represents a MSI interrupt that is |
| 24 | * in use. |
| 25 | */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 26 | static u64 msi_free_irq_bitmask[4]; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 27 | |
| 28 | /* |
| 29 | * Each bit in msi_multiple_irq_bitmask tells that the device using |
| 30 | * this bit in msi_free_irq_bitmask is also using the next bit. This |
| 31 | * is used so we can disable all of the MSI interrupts when a device |
| 32 | * uses multiple. |
| 33 | */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 34 | static u64 msi_multiple_irq_bitmask[4]; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * This lock controls updates to msi_free_irq_bitmask and |
| 38 | * msi_multiple_irq_bitmask. |
| 39 | */ |
| 40 | static DEFINE_SPINLOCK(msi_free_irq_bitmask_lock); |
| 41 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 42 | /* |
| 43 | * Number of MSI IRQs used. This variable is set up in |
| 44 | * the module init time. |
| 45 | */ |
| 46 | static int msi_irq_size; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 47 | |
| 48 | /** |
| 49 | * Called when a driver request MSI interrupts instead of the |
| 50 | * legacy INT A-D. This routine will allocate multiple interrupts |
| 51 | * for MSI devices that support them. A device can override this by |
| 52 | * programming the MSI control bits [6:4] before calling |
| 53 | * pci_enable_msi(). |
| 54 | * |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 55 | * @dev: Device requesting MSI interrupts |
| 56 | * @desc: MSI descriptor |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 57 | * |
| 58 | * Returns 0 on success. |
| 59 | */ |
| 60 | int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc) |
| 61 | { |
| 62 | struct msi_msg msg; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 63 | u16 control; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 64 | int configured_private_bits; |
| 65 | int request_private_bits; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 66 | int irq = 0; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 67 | int irq_step; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 68 | u64 search_mask; |
| 69 | int index; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 70 | |
| 71 | /* |
| 72 | * Read the MSI config to figure out how many IRQs this device |
| 73 | * wants. Most devices only want 1, which will give |
| 74 | * configured_private_bits and request_private_bits equal 0. |
| 75 | */ |
Yijing Wang | 48c3c38 | 2014-09-23 11:02:42 -0600 | [diff] [blame] | 76 | pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 77 | |
| 78 | /* |
| 79 | * If the number of private bits has been configured then use |
| 80 | * that value instead of the requested number. This gives the |
| 81 | * driver the chance to override the number of interrupts |
| 82 | * before calling pci_enable_msi(). |
| 83 | */ |
| 84 | configured_private_bits = (control & PCI_MSI_FLAGS_QSIZE) >> 4; |
| 85 | if (configured_private_bits == 0) { |
| 86 | /* Nothing is configured, so use the hardware requested size */ |
| 87 | request_private_bits = (control & PCI_MSI_FLAGS_QMASK) >> 1; |
| 88 | } else { |
| 89 | /* |
| 90 | * Use the number of configured bits, assuming the |
| 91 | * driver wanted to override the hardware request |
| 92 | * value. |
| 93 | */ |
| 94 | request_private_bits = configured_private_bits; |
| 95 | } |
| 96 | |
| 97 | /* |
| 98 | * The PCI 2.3 spec mandates that there are at most 32 |
| 99 | * interrupts. If this device asks for more, only give it one. |
| 100 | */ |
| 101 | if (request_private_bits > 5) |
| 102 | request_private_bits = 0; |
| 103 | |
| 104 | try_only_one: |
| 105 | /* |
| 106 | * The IRQs have to be aligned on a power of two based on the |
| 107 | * number being requested. |
| 108 | */ |
| 109 | irq_step = 1 << request_private_bits; |
| 110 | |
| 111 | /* Mask with one bit for each IRQ */ |
| 112 | search_mask = (1 << irq_step) - 1; |
| 113 | |
| 114 | /* |
| 115 | * We're going to search msi_free_irq_bitmask_lock for zero |
| 116 | * bits. This represents an MSI interrupt number that isn't in |
| 117 | * use. |
| 118 | */ |
| 119 | spin_lock(&msi_free_irq_bitmask_lock); |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 120 | for (index = 0; index < msi_irq_size/64; index++) { |
| 121 | for (irq = 0; irq < 64; irq += irq_step) { |
| 122 | if ((msi_free_irq_bitmask[index] & (search_mask << irq)) == 0) { |
| 123 | msi_free_irq_bitmask[index] |= search_mask << irq; |
| 124 | msi_multiple_irq_bitmask[index] |= (search_mask >> 1) << irq; |
| 125 | goto msi_irq_allocated; |
| 126 | } |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 127 | } |
| 128 | } |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 129 | msi_irq_allocated: |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 130 | spin_unlock(&msi_free_irq_bitmask_lock); |
| 131 | |
| 132 | /* Make sure the search for available interrupts didn't fail */ |
| 133 | if (irq >= 64) { |
| 134 | if (request_private_bits) { |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 135 | pr_err("arch_setup_msi_irq: Unable to find %d free interrupts, trying just one", |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 136 | 1 << request_private_bits); |
| 137 | request_private_bits = 0; |
| 138 | goto try_only_one; |
| 139 | } else |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 140 | panic("arch_setup_msi_irq: Unable to find a free MSI interrupt"); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | /* MSI interrupts start at logical IRQ OCTEON_IRQ_MSI_BIT0 */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 144 | irq += index*64; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 145 | irq += OCTEON_IRQ_MSI_BIT0; |
| 146 | |
| 147 | switch (octeon_dma_bar_type) { |
| 148 | case OCTEON_DMA_BAR_TYPE_SMALL: |
| 149 | /* When not using big bar, Bar 0 is based at 128MB */ |
| 150 | msg.address_lo = |
| 151 | ((128ul << 20) + CVMX_PCI_MSI_RCV) & 0xffffffff; |
| 152 | msg.address_hi = ((128ul << 20) + CVMX_PCI_MSI_RCV) >> 32; |
Colin Ian King | 7f02c46 | 2014-02-10 18:42:57 +0000 | [diff] [blame] | 153 | break; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 154 | case OCTEON_DMA_BAR_TYPE_BIG: |
| 155 | /* When using big bar, Bar 0 is based at 0 */ |
| 156 | msg.address_lo = (0 + CVMX_PCI_MSI_RCV) & 0xffffffff; |
| 157 | msg.address_hi = (0 + CVMX_PCI_MSI_RCV) >> 32; |
| 158 | break; |
| 159 | case OCTEON_DMA_BAR_TYPE_PCIE: |
| 160 | /* When using PCIe, Bar 0 is based at 0 */ |
| 161 | /* FIXME CVMX_NPEI_MSI_RCV* other than 0? */ |
| 162 | msg.address_lo = (0 + CVMX_NPEI_PCIE_MSI_RCV) & 0xffffffff; |
| 163 | msg.address_hi = (0 + CVMX_NPEI_PCIE_MSI_RCV) >> 32; |
| 164 | break; |
Eunbong Song | d19648d | 2014-04-11 08:32:54 +0000 | [diff] [blame] | 165 | case OCTEON_DMA_BAR_TYPE_PCIE2: |
| 166 | /* When using PCIe2, Bar 0 is based at 0 */ |
| 167 | msg.address_lo = (0 + CVMX_SLI_PCIE_MSI_RCV) & 0xffffffff; |
| 168 | msg.address_hi = (0 + CVMX_SLI_PCIE_MSI_RCV) >> 32; |
| 169 | break; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 170 | default: |
Ralf Baechle | ab75dc0 | 2011-11-17 15:07:31 +0000 | [diff] [blame] | 171 | panic("arch_setup_msi_irq: Invalid octeon_dma_bar_type"); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 172 | } |
| 173 | msg.data = irq - OCTEON_IRQ_MSI_BIT0; |
| 174 | |
| 175 | /* Update the number of IRQs the device has available to it */ |
| 176 | control &= ~PCI_MSI_FLAGS_QSIZE; |
| 177 | control |= request_private_bits << 4; |
Yijing Wang | 48c3c38 | 2014-09-23 11:02:42 -0600 | [diff] [blame] | 178 | pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 179 | |
Thomas Gleixner | e4ec798 | 2011-03-27 15:19:28 +0200 | [diff] [blame] | 180 | irq_set_msi_desc(irq, desc); |
Jiang Liu | 83a1891 | 2014-11-09 23:10:34 +0800 | [diff] [blame] | 181 | pci_write_msi_msg(irq, &msg); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 182 | return 0; |
| 183 | } |
| 184 | |
Chandrakala Chavva | 52a0f00 | 2010-07-26 18:14:16 -0700 | [diff] [blame] | 185 | int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
| 186 | { |
| 187 | struct msi_desc *entry; |
| 188 | int ret; |
| 189 | |
| 190 | /* |
| 191 | * MSI-X is not supported. |
| 192 | */ |
| 193 | if (type == PCI_CAP_ID_MSIX) |
| 194 | return -EINVAL; |
| 195 | |
| 196 | /* |
| 197 | * If an architecture wants to support multiple MSI, it needs to |
| 198 | * override arch_setup_msi_irqs() |
| 199 | */ |
| 200 | if (type == PCI_CAP_ID_MSI && nvec > 1) |
| 201 | return 1; |
| 202 | |
Jiang Liu | bbcffac | 2015-07-09 16:00:37 +0800 | [diff] [blame] | 203 | for_each_pci_msi_entry(entry, dev) { |
Chandrakala Chavva | 52a0f00 | 2010-07-26 18:14:16 -0700 | [diff] [blame] | 204 | ret = arch_setup_msi_irq(dev, entry); |
| 205 | if (ret < 0) |
| 206 | return ret; |
| 207 | if (ret > 0) |
| 208 | return -ENOSPC; |
| 209 | } |
| 210 | |
| 211 | return 0; |
| 212 | } |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 213 | |
| 214 | /** |
| 215 | * Called when a device no longer needs its MSI interrupts. All |
| 216 | * MSI interrupts for the device are freed. |
| 217 | * |
| 218 | * @irq: The devices first irq number. There may be multple in sequence. |
| 219 | */ |
| 220 | void arch_teardown_msi_irq(unsigned int irq) |
| 221 | { |
| 222 | int number_irqs; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 223 | u64 bitmask; |
| 224 | int index = 0; |
| 225 | int irq0; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 226 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 227 | if ((irq < OCTEON_IRQ_MSI_BIT0) |
| 228 | || (irq > msi_irq_size + OCTEON_IRQ_MSI_BIT0)) |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 229 | panic("arch_teardown_msi_irq: Attempted to teardown illegal " |
| 230 | "MSI interrupt (%d)", irq); |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 231 | |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 232 | irq -= OCTEON_IRQ_MSI_BIT0; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 233 | index = irq / 64; |
| 234 | irq0 = irq % 64; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 235 | |
| 236 | /* |
| 237 | * Count the number of IRQs we need to free by looking at the |
| 238 | * msi_multiple_irq_bitmask. Each bit set means that the next |
| 239 | * IRQ is also owned by this device. |
| 240 | */ |
| 241 | number_irqs = 0; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 242 | while ((irq0 + number_irqs < 64) && |
| 243 | (msi_multiple_irq_bitmask[index] |
| 244 | & (1ull << (irq0 + number_irqs)))) |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 245 | number_irqs++; |
| 246 | number_irqs++; |
| 247 | /* Mask with one bit for each IRQ */ |
| 248 | bitmask = (1 << number_irqs) - 1; |
| 249 | /* Shift the mask to the correct bit location */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 250 | bitmask <<= irq0; |
| 251 | if ((msi_free_irq_bitmask[index] & bitmask) != bitmask) |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 252 | panic("arch_teardown_msi_irq: Attempted to teardown MSI " |
| 253 | "interrupt (%d) not in use", irq); |
| 254 | |
| 255 | /* Checks are done, update the in use bitmask */ |
| 256 | spin_lock(&msi_free_irq_bitmask_lock); |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 257 | msi_free_irq_bitmask[index] &= ~bitmask; |
| 258 | msi_multiple_irq_bitmask[index] &= ~bitmask; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 259 | spin_unlock(&msi_free_irq_bitmask_lock); |
| 260 | } |
| 261 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 262 | static DEFINE_RAW_SPINLOCK(octeon_irq_msi_lock); |
| 263 | |
| 264 | static u64 msi_rcv_reg[4]; |
| 265 | static u64 mis_ena_reg[4]; |
| 266 | |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 267 | static void octeon_irq_msi_enable_pcie(struct irq_data *data) |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 268 | { |
| 269 | u64 en; |
| 270 | unsigned long flags; |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 271 | int msi_number = data->irq - OCTEON_IRQ_MSI_BIT0; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 272 | int irq_index = msi_number >> 6; |
| 273 | int irq_bit = msi_number & 0x3f; |
| 274 | |
| 275 | raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags); |
| 276 | en = cvmx_read_csr(mis_ena_reg[irq_index]); |
| 277 | en |= 1ull << irq_bit; |
| 278 | cvmx_write_csr(mis_ena_reg[irq_index], en); |
| 279 | cvmx_read_csr(mis_ena_reg[irq_index]); |
| 280 | raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags); |
| 281 | } |
| 282 | |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 283 | static void octeon_irq_msi_disable_pcie(struct irq_data *data) |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 284 | { |
| 285 | u64 en; |
| 286 | unsigned long flags; |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 287 | int msi_number = data->irq - OCTEON_IRQ_MSI_BIT0; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 288 | int irq_index = msi_number >> 6; |
| 289 | int irq_bit = msi_number & 0x3f; |
| 290 | |
| 291 | raw_spin_lock_irqsave(&octeon_irq_msi_lock, flags); |
| 292 | en = cvmx_read_csr(mis_ena_reg[irq_index]); |
| 293 | en &= ~(1ull << irq_bit); |
| 294 | cvmx_write_csr(mis_ena_reg[irq_index], en); |
| 295 | cvmx_read_csr(mis_ena_reg[irq_index]); |
| 296 | raw_spin_unlock_irqrestore(&octeon_irq_msi_lock, flags); |
| 297 | } |
| 298 | |
| 299 | static struct irq_chip octeon_irq_chip_msi_pcie = { |
| 300 | .name = "MSI", |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 301 | .irq_enable = octeon_irq_msi_enable_pcie, |
| 302 | .irq_disable = octeon_irq_msi_disable_pcie, |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 303 | }; |
| 304 | |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 305 | static void octeon_irq_msi_enable_pci(struct irq_data *data) |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 306 | { |
| 307 | /* |
| 308 | * Octeon PCI doesn't have the ability to mask/unmask MSI |
| 309 | * interrupts individually. Instead of masking/unmasking them |
| 310 | * in groups of 16, we simple assume MSI devices are well |
| 311 | * behaved. MSI interrupts are always enable and the ACK is |
| 312 | * assumed to be enough |
| 313 | */ |
| 314 | } |
| 315 | |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 316 | static void octeon_irq_msi_disable_pci(struct irq_data *data) |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 317 | { |
| 318 | /* See comment in enable */ |
| 319 | } |
| 320 | |
| 321 | static struct irq_chip octeon_irq_chip_msi_pci = { |
| 322 | .name = "MSI", |
David Daney | 0c32638 | 2011-03-25 12:38:51 -0700 | [diff] [blame] | 323 | .irq_enable = octeon_irq_msi_enable_pci, |
| 324 | .irq_disable = octeon_irq_msi_disable_pci, |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 325 | }; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 326 | |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 327 | /* |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 328 | * Called by the interrupt handling code when an MSI interrupt |
| 329 | * occurs. |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 330 | */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 331 | static irqreturn_t __octeon_msi_do_interrupt(int index, u64 msi_bits) |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 332 | { |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 333 | int irq; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 334 | int bit; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 335 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 336 | bit = fls64(msi_bits); |
| 337 | if (bit) { |
| 338 | bit--; |
| 339 | /* Acknowledge it first. */ |
| 340 | cvmx_write_csr(msi_rcv_reg[index], 1ull << bit); |
| 341 | |
| 342 | irq = bit + OCTEON_IRQ_MSI_BIT0 + 64 * index; |
| 343 | do_IRQ(irq); |
| 344 | return IRQ_HANDLED; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 345 | } |
| 346 | return IRQ_NONE; |
| 347 | } |
| 348 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 349 | #define OCTEON_MSI_INT_HANDLER_X(x) \ |
| 350 | static irqreturn_t octeon_msi_interrupt##x(int cpl, void *dev_id) \ |
| 351 | { \ |
| 352 | u64 msi_bits = cvmx_read_csr(msi_rcv_reg[(x)]); \ |
| 353 | return __octeon_msi_do_interrupt((x), msi_bits); \ |
David Daney | a894f14 | 2010-07-23 10:43:45 -0700 | [diff] [blame] | 354 | } |
| 355 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 356 | /* |
| 357 | * Create octeon_msi_interrupt{0-3} function body |
| 358 | */ |
| 359 | OCTEON_MSI_INT_HANDLER_X(0); |
| 360 | OCTEON_MSI_INT_HANDLER_X(1); |
| 361 | OCTEON_MSI_INT_HANDLER_X(2); |
| 362 | OCTEON_MSI_INT_HANDLER_X(3); |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 363 | |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 364 | /* |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 365 | * Initializes the MSI interrupt handling code |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 366 | */ |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 367 | int __init octeon_msi_initialize(void) |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 368 | { |
David Daney | a894f14 | 2010-07-23 10:43:45 -0700 | [diff] [blame] | 369 | int irq; |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 370 | struct irq_chip *msi; |
David Daney | a894f14 | 2010-07-23 10:43:45 -0700 | [diff] [blame] | 371 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 372 | if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_PCIE) { |
| 373 | msi_rcv_reg[0] = CVMX_PEXP_NPEI_MSI_RCV0; |
| 374 | msi_rcv_reg[1] = CVMX_PEXP_NPEI_MSI_RCV1; |
| 375 | msi_rcv_reg[2] = CVMX_PEXP_NPEI_MSI_RCV2; |
| 376 | msi_rcv_reg[3] = CVMX_PEXP_NPEI_MSI_RCV3; |
| 377 | mis_ena_reg[0] = CVMX_PEXP_NPEI_MSI_ENB0; |
| 378 | mis_ena_reg[1] = CVMX_PEXP_NPEI_MSI_ENB1; |
| 379 | mis_ena_reg[2] = CVMX_PEXP_NPEI_MSI_ENB2; |
| 380 | mis_ena_reg[3] = CVMX_PEXP_NPEI_MSI_ENB3; |
| 381 | msi = &octeon_irq_chip_msi_pcie; |
| 382 | } else { |
| 383 | msi_rcv_reg[0] = CVMX_NPI_NPI_MSI_RCV; |
| 384 | #define INVALID_GENERATE_ADE 0x8700000000000000ULL; |
| 385 | msi_rcv_reg[1] = INVALID_GENERATE_ADE; |
| 386 | msi_rcv_reg[2] = INVALID_GENERATE_ADE; |
| 387 | msi_rcv_reg[3] = INVALID_GENERATE_ADE; |
| 388 | mis_ena_reg[0] = INVALID_GENERATE_ADE; |
| 389 | mis_ena_reg[1] = INVALID_GENERATE_ADE; |
| 390 | mis_ena_reg[2] = INVALID_GENERATE_ADE; |
| 391 | mis_ena_reg[3] = INVALID_GENERATE_ADE; |
| 392 | msi = &octeon_irq_chip_msi_pci; |
David Daney | a894f14 | 2010-07-23 10:43:45 -0700 | [diff] [blame] | 393 | } |
| 394 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 395 | for (irq = OCTEON_IRQ_MSI_BIT0; irq <= OCTEON_IRQ_MSI_LAST; irq++) |
Thomas Gleixner | e4ec798 | 2011-03-27 15:19:28 +0200 | [diff] [blame] | 396 | irq_set_chip_and_handler(irq, msi, handle_simple_irq); |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 397 | |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 398 | if (octeon_has_feature(OCTEON_FEATURE_PCIE)) { |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 399 | if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt0, |
| 400 | 0, "MSI[0:63]", octeon_msi_interrupt0)) |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 401 | panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed"); |
| 402 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 403 | if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt1, |
| 404 | 0, "MSI[64:127]", octeon_msi_interrupt1)) |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 405 | panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed"); |
| 406 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 407 | if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt2, |
| 408 | 0, "MSI[127:191]", octeon_msi_interrupt2)) |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 409 | panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed"); |
| 410 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 411 | if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt3, |
| 412 | 0, "MSI[192:255]", octeon_msi_interrupt3)) |
David Daney | 01a6221 | 2009-06-29 17:18:51 -0700 | [diff] [blame] | 413 | panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed"); |
| 414 | |
David Daney | 1aa2b27 | 2010-07-26 18:14:15 -0700 | [diff] [blame] | 415 | msi_irq_size = 256; |
| 416 | } else if (octeon_is_pci_host()) { |
| 417 | if (request_irq(OCTEON_IRQ_PCI_MSI0, octeon_msi_interrupt0, |
| 418 | 0, "MSI[0:15]", octeon_msi_interrupt0)) |
| 419 | panic("request_irq(OCTEON_IRQ_PCI_MSI0) failed"); |
| 420 | |
| 421 | if (request_irq(OCTEON_IRQ_PCI_MSI1, octeon_msi_interrupt0, |
| 422 | 0, "MSI[16:31]", octeon_msi_interrupt0)) |
| 423 | panic("request_irq(OCTEON_IRQ_PCI_MSI1) failed"); |
| 424 | |
| 425 | if (request_irq(OCTEON_IRQ_PCI_MSI2, octeon_msi_interrupt0, |
| 426 | 0, "MSI[32:47]", octeon_msi_interrupt0)) |
| 427 | panic("request_irq(OCTEON_IRQ_PCI_MSI2) failed"); |
| 428 | |
| 429 | if (request_irq(OCTEON_IRQ_PCI_MSI3, octeon_msi_interrupt0, |
| 430 | 0, "MSI[48:63]", octeon_msi_interrupt0)) |
| 431 | panic("request_irq(OCTEON_IRQ_PCI_MSI3) failed"); |
| 432 | msi_irq_size = 64; |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 433 | } |
| 434 | return 0; |
| 435 | } |
David Daney | e8635b4 | 2009-04-23 17:44:38 -0700 | [diff] [blame] | 436 | subsys_initcall(octeon_msi_initialize); |