Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1 | /* |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 2 | * PCIe host controller driver for Tegra SoCs |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 3 | * |
| 4 | * Copyright (c) 2010, CompuLab, Ltd. |
| 5 | * Author: Mike Rapoport <mike@compulab.co.il> |
| 6 | * |
| 7 | * Based on NVIDIA PCIe driver |
| 8 | * Copyright (c) 2008-2009, NVIDIA Corporation. |
| 9 | * |
| 10 | * Bits taken from arch/arm/mach-dove/pcie.c |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2 of the License, or |
| 15 | * (at your option) any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 20 | * more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License along |
| 23 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 24 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 25 | */ |
| 26 | |
| 27 | #include <linux/clk.h> |
| 28 | #include <linux/clk/tegra.h> |
| 29 | #include <linux/delay.h> |
| 30 | #include <linux/export.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/irq.h> |
| 33 | #include <linux/irqdomain.h> |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/module.h> |
| 36 | #include <linux/msi.h> |
| 37 | #include <linux/of_address.h> |
| 38 | #include <linux/of_pci.h> |
| 39 | #include <linux/of_platform.h> |
| 40 | #include <linux/pci.h> |
| 41 | #include <linux/platform_device.h> |
| 42 | #include <linux/sizes.h> |
| 43 | #include <linux/slab.h> |
Stephen Warren | b4f1737 | 2013-05-06 14:19:19 -0600 | [diff] [blame] | 44 | #include <linux/tegra-cpuidle.h> |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 45 | #include <linux/tegra-powergate.h> |
| 46 | #include <linux/vmalloc.h> |
| 47 | #include <linux/regulator/consumer.h> |
| 48 | |
| 49 | #include <asm/mach/irq.h> |
| 50 | #include <asm/mach/map.h> |
| 51 | #include <asm/mach/pci.h> |
| 52 | |
| 53 | #define INT_PCI_MSI_NR (8 * 32) |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 54 | |
| 55 | /* register definitions */ |
| 56 | |
| 57 | #define AFI_AXI_BAR0_SZ 0x00 |
| 58 | #define AFI_AXI_BAR1_SZ 0x04 |
| 59 | #define AFI_AXI_BAR2_SZ 0x08 |
| 60 | #define AFI_AXI_BAR3_SZ 0x0c |
| 61 | #define AFI_AXI_BAR4_SZ 0x10 |
| 62 | #define AFI_AXI_BAR5_SZ 0x14 |
| 63 | |
| 64 | #define AFI_AXI_BAR0_START 0x18 |
| 65 | #define AFI_AXI_BAR1_START 0x1c |
| 66 | #define AFI_AXI_BAR2_START 0x20 |
| 67 | #define AFI_AXI_BAR3_START 0x24 |
| 68 | #define AFI_AXI_BAR4_START 0x28 |
| 69 | #define AFI_AXI_BAR5_START 0x2c |
| 70 | |
| 71 | #define AFI_FPCI_BAR0 0x30 |
| 72 | #define AFI_FPCI_BAR1 0x34 |
| 73 | #define AFI_FPCI_BAR2 0x38 |
| 74 | #define AFI_FPCI_BAR3 0x3c |
| 75 | #define AFI_FPCI_BAR4 0x40 |
| 76 | #define AFI_FPCI_BAR5 0x44 |
| 77 | |
| 78 | #define AFI_CACHE_BAR0_SZ 0x48 |
| 79 | #define AFI_CACHE_BAR0_ST 0x4c |
| 80 | #define AFI_CACHE_BAR1_SZ 0x50 |
| 81 | #define AFI_CACHE_BAR1_ST 0x54 |
| 82 | |
| 83 | #define AFI_MSI_BAR_SZ 0x60 |
| 84 | #define AFI_MSI_FPCI_BAR_ST 0x64 |
| 85 | #define AFI_MSI_AXI_BAR_ST 0x68 |
| 86 | |
| 87 | #define AFI_MSI_VEC0 0x6c |
| 88 | #define AFI_MSI_VEC1 0x70 |
| 89 | #define AFI_MSI_VEC2 0x74 |
| 90 | #define AFI_MSI_VEC3 0x78 |
| 91 | #define AFI_MSI_VEC4 0x7c |
| 92 | #define AFI_MSI_VEC5 0x80 |
| 93 | #define AFI_MSI_VEC6 0x84 |
| 94 | #define AFI_MSI_VEC7 0x88 |
| 95 | |
| 96 | #define AFI_MSI_EN_VEC0 0x8c |
| 97 | #define AFI_MSI_EN_VEC1 0x90 |
| 98 | #define AFI_MSI_EN_VEC2 0x94 |
| 99 | #define AFI_MSI_EN_VEC3 0x98 |
| 100 | #define AFI_MSI_EN_VEC4 0x9c |
| 101 | #define AFI_MSI_EN_VEC5 0xa0 |
| 102 | #define AFI_MSI_EN_VEC6 0xa4 |
| 103 | #define AFI_MSI_EN_VEC7 0xa8 |
| 104 | |
| 105 | #define AFI_CONFIGURATION 0xac |
| 106 | #define AFI_CONFIGURATION_EN_FPCI (1 << 0) |
| 107 | |
| 108 | #define AFI_FPCI_ERROR_MASKS 0xb0 |
| 109 | |
| 110 | #define AFI_INTR_MASK 0xb4 |
| 111 | #define AFI_INTR_MASK_INT_MASK (1 << 0) |
| 112 | #define AFI_INTR_MASK_MSI_MASK (1 << 8) |
| 113 | |
| 114 | #define AFI_INTR_CODE 0xb8 |
| 115 | #define AFI_INTR_CODE_MASK 0xf |
| 116 | #define AFI_INTR_AXI_SLAVE_ERROR 1 |
| 117 | #define AFI_INTR_AXI_DECODE_ERROR 2 |
| 118 | #define AFI_INTR_TARGET_ABORT 3 |
| 119 | #define AFI_INTR_MASTER_ABORT 4 |
| 120 | #define AFI_INTR_INVALID_WRITE 5 |
| 121 | #define AFI_INTR_LEGACY 6 |
| 122 | #define AFI_INTR_FPCI_DECODE_ERROR 7 |
| 123 | |
| 124 | #define AFI_INTR_SIGNATURE 0xbc |
| 125 | #define AFI_UPPER_FPCI_ADDRESS 0xc0 |
| 126 | #define AFI_SM_INTR_ENABLE 0xc4 |
| 127 | #define AFI_SM_INTR_INTA_ASSERT (1 << 0) |
| 128 | #define AFI_SM_INTR_INTB_ASSERT (1 << 1) |
| 129 | #define AFI_SM_INTR_INTC_ASSERT (1 << 2) |
| 130 | #define AFI_SM_INTR_INTD_ASSERT (1 << 3) |
| 131 | #define AFI_SM_INTR_INTA_DEASSERT (1 << 4) |
| 132 | #define AFI_SM_INTR_INTB_DEASSERT (1 << 5) |
| 133 | #define AFI_SM_INTR_INTC_DEASSERT (1 << 6) |
| 134 | #define AFI_SM_INTR_INTD_DEASSERT (1 << 7) |
| 135 | |
| 136 | #define AFI_AFI_INTR_ENABLE 0xc8 |
| 137 | #define AFI_INTR_EN_INI_SLVERR (1 << 0) |
| 138 | #define AFI_INTR_EN_INI_DECERR (1 << 1) |
| 139 | #define AFI_INTR_EN_TGT_SLVERR (1 << 2) |
| 140 | #define AFI_INTR_EN_TGT_DECERR (1 << 3) |
| 141 | #define AFI_INTR_EN_TGT_WRERR (1 << 4) |
| 142 | #define AFI_INTR_EN_DFPCI_DECERR (1 << 5) |
| 143 | #define AFI_INTR_EN_AXI_DECERR (1 << 6) |
| 144 | #define AFI_INTR_EN_FPCI_TIMEOUT (1 << 7) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 145 | #define AFI_INTR_EN_PRSNT_SENSE (1 << 8) |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 146 | |
| 147 | #define AFI_PCIE_CONFIG 0x0f8 |
| 148 | #define AFI_PCIE_CONFIG_PCIE_DISABLE(x) (1 << ((x) + 1)) |
| 149 | #define AFI_PCIE_CONFIG_PCIE_DISABLE_ALL 0xe |
| 150 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK (0xf << 20) |
| 151 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE (0x0 << 20) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 152 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420 (0x0 << 20) |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 153 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL (0x1 << 20) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 154 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222 (0x1 << 20) |
| 155 | #define AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411 (0x2 << 20) |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 156 | |
| 157 | #define AFI_FUSE 0x104 |
| 158 | #define AFI_FUSE_PCIE_T0_GEN2_DIS (1 << 2) |
| 159 | |
| 160 | #define AFI_PEX0_CTRL 0x110 |
| 161 | #define AFI_PEX1_CTRL 0x118 |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 162 | #define AFI_PEX2_CTRL 0x128 |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 163 | #define AFI_PEX_CTRL_RST (1 << 0) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 164 | #define AFI_PEX_CTRL_CLKREQ_EN (1 << 1) |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 165 | #define AFI_PEX_CTRL_REFCLK_EN (1 << 3) |
| 166 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 167 | #define AFI_PEXBIAS_CTRL_0 0x168 |
| 168 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 169 | #define RP_VEND_XP 0x00000F00 |
| 170 | #define RP_VEND_XP_DL_UP (1 << 30) |
| 171 | |
| 172 | #define RP_LINK_CONTROL_STATUS 0x00000090 |
| 173 | #define RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE 0x20000000 |
| 174 | #define RP_LINK_CONTROL_STATUS_LINKSTAT_MASK 0x3fff0000 |
| 175 | |
| 176 | #define PADS_CTL_SEL 0x0000009C |
| 177 | |
| 178 | #define PADS_CTL 0x000000A0 |
| 179 | #define PADS_CTL_IDDQ_1L (1 << 0) |
| 180 | #define PADS_CTL_TX_DATA_EN_1L (1 << 6) |
| 181 | #define PADS_CTL_RX_DATA_EN_1L (1 << 10) |
| 182 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 183 | #define PADS_PLL_CTL_TEGRA20 0x000000B8 |
| 184 | #define PADS_PLL_CTL_TEGRA30 0x000000B4 |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 185 | #define PADS_PLL_CTL_RST_B4SM (1 << 1) |
| 186 | #define PADS_PLL_CTL_LOCKDET (1 << 8) |
| 187 | #define PADS_PLL_CTL_REFCLK_MASK (0x3 << 16) |
| 188 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CML (0 << 16) |
| 189 | #define PADS_PLL_CTL_REFCLK_INTERNAL_CMOS (1 << 16) |
| 190 | #define PADS_PLL_CTL_REFCLK_EXTERNAL (2 << 16) |
| 191 | #define PADS_PLL_CTL_TXCLKREF_MASK (0x1 << 20) |
| 192 | #define PADS_PLL_CTL_TXCLKREF_DIV10 (0 << 20) |
| 193 | #define PADS_PLL_CTL_TXCLKREF_DIV5 (1 << 20) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 194 | #define PADS_PLL_CTL_TXCLKREF_BUF_EN (1 << 22) |
| 195 | |
| 196 | #define PADS_REFCLK_CFG0 0x000000C8 |
| 197 | #define PADS_REFCLK_CFG1 0x000000CC |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 198 | |
Stephen Warren | b02b07a | 2013-08-09 16:49:25 +0200 | [diff] [blame] | 199 | /* |
| 200 | * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit |
| 201 | * entries, one entry per PCIe port. These field definitions and desired |
| 202 | * values aren't in the TRM, but do come from NVIDIA. |
| 203 | */ |
| 204 | #define PADS_REFCLK_CFG_TERM_SHIFT 2 /* 6:2 */ |
| 205 | #define PADS_REFCLK_CFG_E_TERM_SHIFT 7 |
| 206 | #define PADS_REFCLK_CFG_PREDI_SHIFT 8 /* 11:8 */ |
| 207 | #define PADS_REFCLK_CFG_DRVI_SHIFT 12 /* 15:12 */ |
| 208 | |
| 209 | /* Default value provided by HW engineering is 0xfa5c */ |
| 210 | #define PADS_REFCLK_CFG_VALUE \ |
| 211 | ( \ |
| 212 | (0x17 << PADS_REFCLK_CFG_TERM_SHIFT) | \ |
| 213 | (0 << PADS_REFCLK_CFG_E_TERM_SHIFT) | \ |
| 214 | (0xa << PADS_REFCLK_CFG_PREDI_SHIFT) | \ |
| 215 | (0xf << PADS_REFCLK_CFG_DRVI_SHIFT) \ |
| 216 | ) |
| 217 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 218 | struct tegra_msi { |
| 219 | struct msi_chip chip; |
| 220 | DECLARE_BITMAP(used, INT_PCI_MSI_NR); |
| 221 | struct irq_domain *domain; |
| 222 | unsigned long pages; |
| 223 | struct mutex lock; |
| 224 | int irq; |
| 225 | }; |
| 226 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 227 | /* used to differentiate between Tegra SoC generations */ |
| 228 | struct tegra_pcie_soc_data { |
| 229 | unsigned int num_ports; |
| 230 | unsigned int msi_base_shift; |
| 231 | u32 pads_pll_ctl; |
| 232 | u32 tx_ref_sel; |
| 233 | bool has_pex_clkreq_en; |
| 234 | bool has_pex_bias_ctrl; |
| 235 | bool has_intr_prsnt_sense; |
| 236 | bool has_avdd_supply; |
| 237 | bool has_cml_clk; |
| 238 | }; |
| 239 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 240 | static inline struct tegra_msi *to_tegra_msi(struct msi_chip *chip) |
| 241 | { |
| 242 | return container_of(chip, struct tegra_msi, chip); |
| 243 | } |
| 244 | |
| 245 | struct tegra_pcie { |
| 246 | struct device *dev; |
| 247 | |
| 248 | void __iomem *pads; |
| 249 | void __iomem *afi; |
| 250 | int irq; |
| 251 | |
| 252 | struct list_head busses; |
| 253 | struct resource *cs; |
| 254 | |
| 255 | struct resource io; |
| 256 | struct resource mem; |
| 257 | struct resource prefetch; |
| 258 | struct resource busn; |
| 259 | |
| 260 | struct clk *pex_clk; |
| 261 | struct clk *afi_clk; |
| 262 | struct clk *pcie_xclk; |
| 263 | struct clk *pll_e; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 264 | struct clk *cml_clk; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 265 | |
| 266 | struct tegra_msi msi; |
| 267 | |
| 268 | struct list_head ports; |
| 269 | unsigned int num_ports; |
| 270 | u32 xbar_config; |
| 271 | |
| 272 | struct regulator *pex_clk_supply; |
| 273 | struct regulator *vdd_supply; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 274 | struct regulator *avdd_supply; |
| 275 | |
| 276 | const struct tegra_pcie_soc_data *soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 277 | }; |
| 278 | |
| 279 | struct tegra_pcie_port { |
| 280 | struct tegra_pcie *pcie; |
| 281 | struct list_head list; |
| 282 | struct resource regs; |
| 283 | void __iomem *base; |
| 284 | unsigned int index; |
| 285 | unsigned int lanes; |
| 286 | }; |
| 287 | |
| 288 | struct tegra_pcie_bus { |
| 289 | struct vm_struct *area; |
| 290 | struct list_head list; |
| 291 | unsigned int nr; |
| 292 | }; |
| 293 | |
| 294 | static inline struct tegra_pcie *sys_to_pcie(struct pci_sys_data *sys) |
| 295 | { |
| 296 | return sys->private_data; |
| 297 | } |
| 298 | |
| 299 | static inline void afi_writel(struct tegra_pcie *pcie, u32 value, |
| 300 | unsigned long offset) |
| 301 | { |
| 302 | writel(value, pcie->afi + offset); |
| 303 | } |
| 304 | |
| 305 | static inline u32 afi_readl(struct tegra_pcie *pcie, unsigned long offset) |
| 306 | { |
| 307 | return readl(pcie->afi + offset); |
| 308 | } |
| 309 | |
| 310 | static inline void pads_writel(struct tegra_pcie *pcie, u32 value, |
| 311 | unsigned long offset) |
| 312 | { |
| 313 | writel(value, pcie->pads + offset); |
| 314 | } |
| 315 | |
| 316 | static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset) |
| 317 | { |
| 318 | return readl(pcie->pads + offset); |
| 319 | } |
| 320 | |
| 321 | /* |
| 322 | * The configuration space mapping on Tegra is somewhat similar to the ECAM |
| 323 | * defined by PCIe. However it deviates a bit in how the 4 bits for extended |
| 324 | * register accesses are mapped: |
| 325 | * |
| 326 | * [27:24] extended register number |
| 327 | * [23:16] bus number |
| 328 | * [15:11] device number |
| 329 | * [10: 8] function number |
| 330 | * [ 7: 0] register number |
| 331 | * |
| 332 | * Mapping the whole extended configuration space would require 256 MiB of |
| 333 | * virtual address space, only a small part of which will actually be used. |
| 334 | * To work around this, a 1 MiB of virtual addresses are allocated per bus |
| 335 | * when the bus is first accessed. When the physical range is mapped, the |
| 336 | * the bus number bits are hidden so that the extended register number bits |
| 337 | * appear as bits [19:16]. Therefore the virtual mapping looks like this: |
| 338 | * |
| 339 | * [19:16] extended register number |
| 340 | * [15:11] device number |
| 341 | * [10: 8] function number |
| 342 | * [ 7: 0] register number |
| 343 | * |
| 344 | * This is achieved by stitching together 16 chunks of 64 KiB of physical |
| 345 | * address space via the MMU. |
| 346 | */ |
| 347 | static unsigned long tegra_pcie_conf_offset(unsigned int devfn, int where) |
| 348 | { |
| 349 | return ((where & 0xf00) << 8) | (PCI_SLOT(devfn) << 11) | |
| 350 | (PCI_FUNC(devfn) << 8) | (where & 0xfc); |
| 351 | } |
| 352 | |
| 353 | static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie, |
| 354 | unsigned int busnr) |
| 355 | { |
| 356 | pgprot_t prot = L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY | L_PTE_XN | |
| 357 | L_PTE_MT_DEV_SHARED | L_PTE_SHARED; |
| 358 | phys_addr_t cs = pcie->cs->start; |
| 359 | struct tegra_pcie_bus *bus; |
| 360 | unsigned int i; |
| 361 | int err; |
| 362 | |
| 363 | bus = kzalloc(sizeof(*bus), GFP_KERNEL); |
| 364 | if (!bus) |
| 365 | return ERR_PTR(-ENOMEM); |
| 366 | |
| 367 | INIT_LIST_HEAD(&bus->list); |
| 368 | bus->nr = busnr; |
| 369 | |
| 370 | /* allocate 1 MiB of virtual addresses */ |
| 371 | bus->area = get_vm_area(SZ_1M, VM_IOREMAP); |
| 372 | if (!bus->area) { |
| 373 | err = -ENOMEM; |
| 374 | goto free; |
| 375 | } |
| 376 | |
| 377 | /* map each of the 16 chunks of 64 KiB each */ |
| 378 | for (i = 0; i < 16; i++) { |
| 379 | unsigned long virt = (unsigned long)bus->area->addr + |
| 380 | i * SZ_64K; |
| 381 | phys_addr_t phys = cs + i * SZ_1M + busnr * SZ_64K; |
| 382 | |
| 383 | err = ioremap_page_range(virt, virt + SZ_64K, phys, prot); |
| 384 | if (err < 0) { |
| 385 | dev_err(pcie->dev, "ioremap_page_range() failed: %d\n", |
| 386 | err); |
| 387 | goto unmap; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | return bus; |
| 392 | |
| 393 | unmap: |
| 394 | vunmap(bus->area->addr); |
| 395 | free: |
| 396 | kfree(bus); |
| 397 | return ERR_PTR(err); |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Look up a virtual address mapping for the specified bus number. If no such |
| 402 | * mapping existis, try to create one. |
| 403 | */ |
| 404 | static void __iomem *tegra_pcie_bus_map(struct tegra_pcie *pcie, |
| 405 | unsigned int busnr) |
| 406 | { |
| 407 | struct tegra_pcie_bus *bus; |
| 408 | |
| 409 | list_for_each_entry(bus, &pcie->busses, list) |
| 410 | if (bus->nr == busnr) |
| 411 | return bus->area->addr; |
| 412 | |
| 413 | bus = tegra_pcie_bus_alloc(pcie, busnr); |
| 414 | if (IS_ERR(bus)) |
| 415 | return NULL; |
| 416 | |
| 417 | list_add_tail(&bus->list, &pcie->busses); |
| 418 | |
| 419 | return bus->area->addr; |
| 420 | } |
| 421 | |
| 422 | static void __iomem *tegra_pcie_conf_address(struct pci_bus *bus, |
| 423 | unsigned int devfn, |
| 424 | int where) |
| 425 | { |
| 426 | struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); |
| 427 | void __iomem *addr = NULL; |
| 428 | |
| 429 | if (bus->number == 0) { |
| 430 | unsigned int slot = PCI_SLOT(devfn); |
| 431 | struct tegra_pcie_port *port; |
| 432 | |
| 433 | list_for_each_entry(port, &pcie->ports, list) { |
| 434 | if (port->index + 1 == slot) { |
| 435 | addr = port->base + (where & ~3); |
| 436 | break; |
| 437 | } |
| 438 | } |
| 439 | } else { |
| 440 | addr = tegra_pcie_bus_map(pcie, bus->number); |
| 441 | if (!addr) { |
| 442 | dev_err(pcie->dev, |
| 443 | "failed to map cfg. space for bus %u\n", |
| 444 | bus->number); |
| 445 | return NULL; |
| 446 | } |
| 447 | |
| 448 | addr += tegra_pcie_conf_offset(devfn, where); |
| 449 | } |
| 450 | |
| 451 | return addr; |
| 452 | } |
| 453 | |
| 454 | static int tegra_pcie_read_conf(struct pci_bus *bus, unsigned int devfn, |
| 455 | int where, int size, u32 *value) |
| 456 | { |
| 457 | void __iomem *addr; |
| 458 | |
| 459 | addr = tegra_pcie_conf_address(bus, devfn, where); |
| 460 | if (!addr) { |
| 461 | *value = 0xffffffff; |
| 462 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 463 | } |
| 464 | |
| 465 | *value = readl(addr); |
| 466 | |
| 467 | if (size == 1) |
| 468 | *value = (*value >> (8 * (where & 3))) & 0xff; |
| 469 | else if (size == 2) |
| 470 | *value = (*value >> (8 * (where & 3))) & 0xffff; |
| 471 | |
| 472 | return PCIBIOS_SUCCESSFUL; |
| 473 | } |
| 474 | |
| 475 | static int tegra_pcie_write_conf(struct pci_bus *bus, unsigned int devfn, |
| 476 | int where, int size, u32 value) |
| 477 | { |
| 478 | void __iomem *addr; |
| 479 | u32 mask, tmp; |
| 480 | |
| 481 | addr = tegra_pcie_conf_address(bus, devfn, where); |
| 482 | if (!addr) |
| 483 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 484 | |
| 485 | if (size == 4) { |
| 486 | writel(value, addr); |
| 487 | return PCIBIOS_SUCCESSFUL; |
| 488 | } |
| 489 | |
| 490 | if (size == 2) |
| 491 | mask = ~(0xffff << ((where & 0x3) * 8)); |
| 492 | else if (size == 1) |
| 493 | mask = ~(0xff << ((where & 0x3) * 8)); |
| 494 | else |
| 495 | return PCIBIOS_BAD_REGISTER_NUMBER; |
| 496 | |
| 497 | tmp = readl(addr) & mask; |
| 498 | tmp |= value << ((where & 0x3) * 8); |
| 499 | writel(tmp, addr); |
| 500 | |
| 501 | return PCIBIOS_SUCCESSFUL; |
| 502 | } |
| 503 | |
| 504 | static struct pci_ops tegra_pcie_ops = { |
| 505 | .read = tegra_pcie_read_conf, |
| 506 | .write = tegra_pcie_write_conf, |
| 507 | }; |
| 508 | |
| 509 | static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port) |
| 510 | { |
| 511 | unsigned long ret = 0; |
| 512 | |
| 513 | switch (port->index) { |
| 514 | case 0: |
| 515 | ret = AFI_PEX0_CTRL; |
| 516 | break; |
| 517 | |
| 518 | case 1: |
| 519 | ret = AFI_PEX1_CTRL; |
| 520 | break; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 521 | |
| 522 | case 2: |
| 523 | ret = AFI_PEX2_CTRL; |
| 524 | break; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | return ret; |
| 528 | } |
| 529 | |
| 530 | static void tegra_pcie_port_reset(struct tegra_pcie_port *port) |
| 531 | { |
| 532 | unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); |
| 533 | unsigned long value; |
| 534 | |
| 535 | /* pulse reset signal */ |
| 536 | value = afi_readl(port->pcie, ctrl); |
| 537 | value &= ~AFI_PEX_CTRL_RST; |
| 538 | afi_writel(port->pcie, value, ctrl); |
| 539 | |
| 540 | usleep_range(1000, 2000); |
| 541 | |
| 542 | value = afi_readl(port->pcie, ctrl); |
| 543 | value |= AFI_PEX_CTRL_RST; |
| 544 | afi_writel(port->pcie, value, ctrl); |
| 545 | } |
| 546 | |
| 547 | static void tegra_pcie_port_enable(struct tegra_pcie_port *port) |
| 548 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 549 | const struct tegra_pcie_soc_data *soc = port->pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 550 | unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); |
| 551 | unsigned long value; |
| 552 | |
| 553 | /* enable reference clock */ |
| 554 | value = afi_readl(port->pcie, ctrl); |
| 555 | value |= AFI_PEX_CTRL_REFCLK_EN; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 556 | |
| 557 | if (soc->has_pex_clkreq_en) |
| 558 | value |= AFI_PEX_CTRL_CLKREQ_EN; |
| 559 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 560 | afi_writel(port->pcie, value, ctrl); |
| 561 | |
| 562 | tegra_pcie_port_reset(port); |
| 563 | } |
| 564 | |
| 565 | static void tegra_pcie_port_disable(struct tegra_pcie_port *port) |
| 566 | { |
| 567 | unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port); |
| 568 | unsigned long value; |
| 569 | |
| 570 | /* assert port reset */ |
| 571 | value = afi_readl(port->pcie, ctrl); |
| 572 | value &= ~AFI_PEX_CTRL_RST; |
| 573 | afi_writel(port->pcie, value, ctrl); |
| 574 | |
| 575 | /* disable reference clock */ |
| 576 | value = afi_readl(port->pcie, ctrl); |
| 577 | value &= ~AFI_PEX_CTRL_REFCLK_EN; |
| 578 | afi_writel(port->pcie, value, ctrl); |
| 579 | } |
| 580 | |
| 581 | static void tegra_pcie_port_free(struct tegra_pcie_port *port) |
| 582 | { |
| 583 | struct tegra_pcie *pcie = port->pcie; |
| 584 | |
| 585 | devm_iounmap(pcie->dev, port->base); |
| 586 | devm_release_mem_region(pcie->dev, port->regs.start, |
| 587 | resource_size(&port->regs)); |
| 588 | list_del(&port->list); |
| 589 | devm_kfree(pcie->dev, port); |
| 590 | } |
| 591 | |
| 592 | static void tegra_pcie_fixup_bridge(struct pci_dev *dev) |
| 593 | { |
| 594 | u16 reg; |
| 595 | |
| 596 | if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE) { |
| 597 | pci_read_config_word(dev, PCI_COMMAND, ®); |
| 598 | reg |= (PCI_COMMAND_IO | PCI_COMMAND_MEMORY | |
| 599 | PCI_COMMAND_MASTER | PCI_COMMAND_SERR); |
| 600 | pci_write_config_word(dev, PCI_COMMAND, reg); |
| 601 | } |
| 602 | } |
| 603 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_fixup_bridge); |
| 604 | |
| 605 | /* Tegra PCIE root complex wrongly reports device class */ |
| 606 | static void tegra_pcie_fixup_class(struct pci_dev *dev) |
| 607 | { |
| 608 | dev->class = PCI_CLASS_BRIDGE_PCI << 8; |
| 609 | } |
| 610 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class); |
| 611 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class); |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 612 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class); |
| 613 | DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 614 | |
| 615 | /* Tegra PCIE requires relaxed ordering */ |
| 616 | static void tegra_pcie_relax_enable(struct pci_dev *dev) |
| 617 | { |
| 618 | pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN); |
| 619 | } |
| 620 | DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable); |
| 621 | |
| 622 | static int tegra_pcie_setup(int nr, struct pci_sys_data *sys) |
| 623 | { |
| 624 | struct tegra_pcie *pcie = sys_to_pcie(sys); |
| 625 | |
| 626 | pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset); |
| 627 | pci_add_resource_offset(&sys->resources, &pcie->prefetch, |
| 628 | sys->mem_offset); |
| 629 | pci_add_resource(&sys->resources, &pcie->busn); |
| 630 | |
| 631 | pci_ioremap_io(nr * SZ_64K, pcie->io.start); |
| 632 | |
| 633 | return 1; |
| 634 | } |
| 635 | |
| 636 | static int tegra_pcie_map_irq(const struct pci_dev *pdev, u8 slot, u8 pin) |
| 637 | { |
| 638 | struct tegra_pcie *pcie = sys_to_pcie(pdev->bus->sysdata); |
| 639 | |
Stephen Warren | b4f1737 | 2013-05-06 14:19:19 -0600 | [diff] [blame] | 640 | tegra_cpuidle_pcie_irqs_in_use(); |
| 641 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 642 | return pcie->irq; |
| 643 | } |
| 644 | |
| 645 | static void tegra_pcie_add_bus(struct pci_bus *bus) |
| 646 | { |
| 647 | if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| 648 | struct tegra_pcie *pcie = sys_to_pcie(bus->sysdata); |
| 649 | |
| 650 | bus->msi = &pcie->msi.chip; |
| 651 | } |
| 652 | } |
| 653 | |
| 654 | static struct pci_bus *tegra_pcie_scan_bus(int nr, struct pci_sys_data *sys) |
| 655 | { |
| 656 | struct tegra_pcie *pcie = sys_to_pcie(sys); |
| 657 | struct pci_bus *bus; |
| 658 | |
| 659 | bus = pci_create_root_bus(pcie->dev, sys->busnr, &tegra_pcie_ops, sys, |
| 660 | &sys->resources); |
| 661 | if (!bus) |
| 662 | return NULL; |
| 663 | |
| 664 | pci_scan_child_bus(bus); |
| 665 | |
| 666 | return bus; |
| 667 | } |
| 668 | |
| 669 | static irqreturn_t tegra_pcie_isr(int irq, void *arg) |
| 670 | { |
| 671 | const char *err_msg[] = { |
| 672 | "Unknown", |
| 673 | "AXI slave error", |
| 674 | "AXI decode error", |
| 675 | "Target abort", |
| 676 | "Master abort", |
| 677 | "Invalid write", |
| 678 | "Response decoding error", |
| 679 | "AXI response decoding error", |
| 680 | "Transaction timeout", |
| 681 | }; |
| 682 | struct tegra_pcie *pcie = arg; |
| 683 | u32 code, signature; |
| 684 | |
| 685 | code = afi_readl(pcie, AFI_INTR_CODE) & AFI_INTR_CODE_MASK; |
| 686 | signature = afi_readl(pcie, AFI_INTR_SIGNATURE); |
| 687 | afi_writel(pcie, 0, AFI_INTR_CODE); |
| 688 | |
| 689 | if (code == AFI_INTR_LEGACY) |
| 690 | return IRQ_NONE; |
| 691 | |
| 692 | if (code >= ARRAY_SIZE(err_msg)) |
| 693 | code = 0; |
| 694 | |
| 695 | /* |
| 696 | * do not pollute kernel log with master abort reports since they |
| 697 | * happen a lot during enumeration |
| 698 | */ |
| 699 | if (code == AFI_INTR_MASTER_ABORT) |
| 700 | dev_dbg(pcie->dev, "%s, signature: %08x\n", err_msg[code], |
| 701 | signature); |
| 702 | else |
| 703 | dev_err(pcie->dev, "%s, signature: %08x\n", err_msg[code], |
| 704 | signature); |
| 705 | |
| 706 | if (code == AFI_INTR_TARGET_ABORT || code == AFI_INTR_MASTER_ABORT || |
| 707 | code == AFI_INTR_FPCI_DECODE_ERROR) { |
| 708 | u32 fpci = afi_readl(pcie, AFI_UPPER_FPCI_ADDRESS) & 0xff; |
| 709 | u64 address = (u64)fpci << 32 | (signature & 0xfffffffc); |
| 710 | |
| 711 | if (code == AFI_INTR_MASTER_ABORT) |
| 712 | dev_dbg(pcie->dev, " FPCI address: %10llx\n", address); |
| 713 | else |
| 714 | dev_err(pcie->dev, " FPCI address: %10llx\n", address); |
| 715 | } |
| 716 | |
| 717 | return IRQ_HANDLED; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * FPCI map is as follows: |
| 722 | * - 0xfdfc000000: I/O space |
| 723 | * - 0xfdfe000000: type 0 configuration space |
| 724 | * - 0xfdff000000: type 1 configuration space |
| 725 | * - 0xfe00000000: type 0 extended configuration space |
| 726 | * - 0xfe10000000: type 1 extended configuration space |
| 727 | */ |
| 728 | static void tegra_pcie_setup_translations(struct tegra_pcie *pcie) |
| 729 | { |
| 730 | u32 fpci_bar, size, axi_address; |
| 731 | |
| 732 | /* Bar 0: type 1 extended configuration space */ |
| 733 | fpci_bar = 0xfe100000; |
| 734 | size = resource_size(pcie->cs); |
| 735 | axi_address = pcie->cs->start; |
| 736 | afi_writel(pcie, axi_address, AFI_AXI_BAR0_START); |
| 737 | afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ); |
| 738 | afi_writel(pcie, fpci_bar, AFI_FPCI_BAR0); |
| 739 | |
| 740 | /* Bar 1: downstream IO bar */ |
| 741 | fpci_bar = 0xfdfc0000; |
| 742 | size = resource_size(&pcie->io); |
| 743 | axi_address = pcie->io.start; |
| 744 | afi_writel(pcie, axi_address, AFI_AXI_BAR1_START); |
| 745 | afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ); |
| 746 | afi_writel(pcie, fpci_bar, AFI_FPCI_BAR1); |
| 747 | |
| 748 | /* Bar 2: prefetchable memory BAR */ |
| 749 | fpci_bar = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1; |
| 750 | size = resource_size(&pcie->prefetch); |
| 751 | axi_address = pcie->prefetch.start; |
| 752 | afi_writel(pcie, axi_address, AFI_AXI_BAR2_START); |
| 753 | afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ); |
| 754 | afi_writel(pcie, fpci_bar, AFI_FPCI_BAR2); |
| 755 | |
| 756 | /* Bar 3: non prefetchable memory BAR */ |
| 757 | fpci_bar = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1; |
| 758 | size = resource_size(&pcie->mem); |
| 759 | axi_address = pcie->mem.start; |
| 760 | afi_writel(pcie, axi_address, AFI_AXI_BAR3_START); |
| 761 | afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ); |
| 762 | afi_writel(pcie, fpci_bar, AFI_FPCI_BAR3); |
| 763 | |
| 764 | /* NULL out the remaining BARs as they are not used */ |
| 765 | afi_writel(pcie, 0, AFI_AXI_BAR4_START); |
| 766 | afi_writel(pcie, 0, AFI_AXI_BAR4_SZ); |
| 767 | afi_writel(pcie, 0, AFI_FPCI_BAR4); |
| 768 | |
| 769 | afi_writel(pcie, 0, AFI_AXI_BAR5_START); |
| 770 | afi_writel(pcie, 0, AFI_AXI_BAR5_SZ); |
| 771 | afi_writel(pcie, 0, AFI_FPCI_BAR5); |
| 772 | |
| 773 | /* map all upstream transactions as uncached */ |
| 774 | afi_writel(pcie, PHYS_OFFSET, AFI_CACHE_BAR0_ST); |
| 775 | afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ); |
| 776 | afi_writel(pcie, 0, AFI_CACHE_BAR1_ST); |
| 777 | afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ); |
| 778 | |
| 779 | /* MSI translations are setup only when needed */ |
| 780 | afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST); |
| 781 | afi_writel(pcie, 0, AFI_MSI_BAR_SZ); |
| 782 | afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST); |
| 783 | afi_writel(pcie, 0, AFI_MSI_BAR_SZ); |
| 784 | } |
| 785 | |
| 786 | static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) |
| 787 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 788 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 789 | struct tegra_pcie_port *port; |
| 790 | unsigned int timeout; |
| 791 | unsigned long value; |
| 792 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 793 | /* power down PCIe slot clock bias pad */ |
| 794 | if (soc->has_pex_bias_ctrl) |
| 795 | afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0); |
| 796 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 797 | /* configure mode and disable all ports */ |
| 798 | value = afi_readl(pcie, AFI_PCIE_CONFIG); |
| 799 | value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK; |
| 800 | value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar_config; |
| 801 | |
| 802 | list_for_each_entry(port, &pcie->ports, list) |
| 803 | value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index); |
| 804 | |
| 805 | afi_writel(pcie, value, AFI_PCIE_CONFIG); |
| 806 | |
| 807 | value = afi_readl(pcie, AFI_FUSE); |
| 808 | value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS; |
| 809 | afi_writel(pcie, value, AFI_FUSE); |
| 810 | |
| 811 | /* initialze internal PHY, enable up to 16 PCIE lanes */ |
| 812 | pads_writel(pcie, 0x0, PADS_CTL_SEL); |
| 813 | |
| 814 | /* override IDDQ to 1 on all 4 lanes */ |
| 815 | value = pads_readl(pcie, PADS_CTL); |
| 816 | value |= PADS_CTL_IDDQ_1L; |
| 817 | pads_writel(pcie, value, PADS_CTL); |
| 818 | |
| 819 | /* |
| 820 | * Set up PHY PLL inputs select PLLE output as refclock, |
| 821 | * set TX ref sel to div10 (not div5). |
| 822 | */ |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 823 | value = pads_readl(pcie, soc->pads_pll_ctl); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 824 | value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK); |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 825 | value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel; |
| 826 | pads_writel(pcie, value, soc->pads_pll_ctl); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 827 | |
| 828 | /* take PLL out of reset */ |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 829 | value = pads_readl(pcie, soc->pads_pll_ctl); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 830 | value |= PADS_PLL_CTL_RST_B4SM; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 831 | pads_writel(pcie, value, soc->pads_pll_ctl); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 832 | |
Stephen Warren | b02b07a | 2013-08-09 16:49:25 +0200 | [diff] [blame] | 833 | /* Configure the reference clock driver */ |
| 834 | value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16); |
| 835 | pads_writel(pcie, value, PADS_REFCLK_CFG0); |
| 836 | if (soc->num_ports > 2) |
| 837 | pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 838 | |
| 839 | /* wait for the PLL to lock */ |
| 840 | timeout = 300; |
| 841 | do { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 842 | value = pads_readl(pcie, soc->pads_pll_ctl); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 843 | usleep_range(1000, 2000); |
| 844 | if (--timeout == 0) { |
| 845 | pr_err("Tegra PCIe error: timeout waiting for PLL\n"); |
| 846 | return -EBUSY; |
| 847 | } |
| 848 | } while (!(value & PADS_PLL_CTL_LOCKDET)); |
| 849 | |
| 850 | /* turn off IDDQ override */ |
| 851 | value = pads_readl(pcie, PADS_CTL); |
| 852 | value &= ~PADS_CTL_IDDQ_1L; |
| 853 | pads_writel(pcie, value, PADS_CTL); |
| 854 | |
| 855 | /* enable TX/RX data */ |
| 856 | value = pads_readl(pcie, PADS_CTL); |
| 857 | value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L; |
| 858 | pads_writel(pcie, value, PADS_CTL); |
| 859 | |
| 860 | /* take the PCIe interface module out of reset */ |
| 861 | tegra_periph_reset_deassert(pcie->pcie_xclk); |
| 862 | |
| 863 | /* finally enable PCIe */ |
| 864 | value = afi_readl(pcie, AFI_CONFIGURATION); |
| 865 | value |= AFI_CONFIGURATION_EN_FPCI; |
| 866 | afi_writel(pcie, value, AFI_CONFIGURATION); |
| 867 | |
| 868 | value = AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | |
| 869 | AFI_INTR_EN_TGT_SLVERR | AFI_INTR_EN_TGT_DECERR | |
| 870 | AFI_INTR_EN_TGT_WRERR | AFI_INTR_EN_DFPCI_DECERR; |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 871 | |
| 872 | if (soc->has_intr_prsnt_sense) |
| 873 | value |= AFI_INTR_EN_PRSNT_SENSE; |
| 874 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 875 | afi_writel(pcie, value, AFI_AFI_INTR_ENABLE); |
| 876 | afi_writel(pcie, 0xffffffff, AFI_SM_INTR_ENABLE); |
| 877 | |
| 878 | /* don't enable MSI for now, only when needed */ |
| 879 | afi_writel(pcie, AFI_INTR_MASK_INT_MASK, AFI_INTR_MASK); |
| 880 | |
| 881 | /* disable all exceptions */ |
| 882 | afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS); |
| 883 | |
| 884 | return 0; |
| 885 | } |
| 886 | |
| 887 | static void tegra_pcie_power_off(struct tegra_pcie *pcie) |
| 888 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 889 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 890 | int err; |
| 891 | |
| 892 | /* TODO: disable and unprepare clocks? */ |
| 893 | |
| 894 | tegra_periph_reset_assert(pcie->pcie_xclk); |
| 895 | tegra_periph_reset_assert(pcie->afi_clk); |
| 896 | tegra_periph_reset_assert(pcie->pex_clk); |
| 897 | |
| 898 | tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); |
| 899 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 900 | if (soc->has_avdd_supply) { |
| 901 | err = regulator_disable(pcie->avdd_supply); |
| 902 | if (err < 0) |
| 903 | dev_warn(pcie->dev, |
| 904 | "failed to disable AVDD regulator: %d\n", |
| 905 | err); |
| 906 | } |
| 907 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 908 | err = regulator_disable(pcie->pex_clk_supply); |
| 909 | if (err < 0) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 910 | dev_warn(pcie->dev, "failed to disable pex-clk regulator: %d\n", |
| 911 | err); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 912 | |
| 913 | err = regulator_disable(pcie->vdd_supply); |
| 914 | if (err < 0) |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 915 | dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n", |
| 916 | err); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 917 | } |
| 918 | |
| 919 | static int tegra_pcie_power_on(struct tegra_pcie *pcie) |
| 920 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 921 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 922 | int err; |
| 923 | |
| 924 | tegra_periph_reset_assert(pcie->pcie_xclk); |
| 925 | tegra_periph_reset_assert(pcie->afi_clk); |
| 926 | tegra_periph_reset_assert(pcie->pex_clk); |
| 927 | |
| 928 | tegra_powergate_power_off(TEGRA_POWERGATE_PCIE); |
| 929 | |
| 930 | /* enable regulators */ |
| 931 | err = regulator_enable(pcie->vdd_supply); |
| 932 | if (err < 0) { |
| 933 | dev_err(pcie->dev, "failed to enable VDD regulator: %d\n", err); |
| 934 | return err; |
| 935 | } |
| 936 | |
| 937 | err = regulator_enable(pcie->pex_clk_supply); |
| 938 | if (err < 0) { |
| 939 | dev_err(pcie->dev, "failed to enable pex-clk regulator: %d\n", |
| 940 | err); |
| 941 | return err; |
| 942 | } |
| 943 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 944 | if (soc->has_avdd_supply) { |
| 945 | err = regulator_enable(pcie->avdd_supply); |
| 946 | if (err < 0) { |
| 947 | dev_err(pcie->dev, |
| 948 | "failed to enable AVDD regulator: %d\n", |
| 949 | err); |
| 950 | return err; |
| 951 | } |
| 952 | } |
| 953 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 954 | err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE, |
| 955 | pcie->pex_clk); |
| 956 | if (err) { |
| 957 | dev_err(pcie->dev, "powerup sequence failed: %d\n", err); |
| 958 | return err; |
| 959 | } |
| 960 | |
| 961 | tegra_periph_reset_deassert(pcie->afi_clk); |
| 962 | |
| 963 | err = clk_prepare_enable(pcie->afi_clk); |
| 964 | if (err < 0) { |
| 965 | dev_err(pcie->dev, "failed to enable AFI clock: %d\n", err); |
| 966 | return err; |
| 967 | } |
| 968 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 969 | if (soc->has_cml_clk) { |
| 970 | err = clk_prepare_enable(pcie->cml_clk); |
| 971 | if (err < 0) { |
| 972 | dev_err(pcie->dev, "failed to enable CML clock: %d\n", |
| 973 | err); |
| 974 | return err; |
| 975 | } |
| 976 | } |
| 977 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 978 | err = clk_prepare_enable(pcie->pll_e); |
| 979 | if (err < 0) { |
| 980 | dev_err(pcie->dev, "failed to enable PLLE clock: %d\n", err); |
| 981 | return err; |
| 982 | } |
| 983 | |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | static int tegra_pcie_clocks_get(struct tegra_pcie *pcie) |
| 988 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 989 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
| 990 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 991 | pcie->pex_clk = devm_clk_get(pcie->dev, "pex"); |
| 992 | if (IS_ERR(pcie->pex_clk)) |
| 993 | return PTR_ERR(pcie->pex_clk); |
| 994 | |
| 995 | pcie->afi_clk = devm_clk_get(pcie->dev, "afi"); |
| 996 | if (IS_ERR(pcie->afi_clk)) |
| 997 | return PTR_ERR(pcie->afi_clk); |
| 998 | |
| 999 | pcie->pcie_xclk = devm_clk_get(pcie->dev, "pcie_xclk"); |
| 1000 | if (IS_ERR(pcie->pcie_xclk)) |
| 1001 | return PTR_ERR(pcie->pcie_xclk); |
| 1002 | |
| 1003 | pcie->pll_e = devm_clk_get(pcie->dev, "pll_e"); |
| 1004 | if (IS_ERR(pcie->pll_e)) |
| 1005 | return PTR_ERR(pcie->pll_e); |
| 1006 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1007 | if (soc->has_cml_clk) { |
| 1008 | pcie->cml_clk = devm_clk_get(pcie->dev, "cml"); |
| 1009 | if (IS_ERR(pcie->cml_clk)) |
| 1010 | return PTR_ERR(pcie->cml_clk); |
| 1011 | } |
| 1012 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1013 | return 0; |
| 1014 | } |
| 1015 | |
| 1016 | static int tegra_pcie_get_resources(struct tegra_pcie *pcie) |
| 1017 | { |
| 1018 | struct platform_device *pdev = to_platform_device(pcie->dev); |
| 1019 | struct resource *pads, *afi, *res; |
| 1020 | int err; |
| 1021 | |
| 1022 | err = tegra_pcie_clocks_get(pcie); |
| 1023 | if (err) { |
| 1024 | dev_err(&pdev->dev, "failed to get clocks: %d\n", err); |
| 1025 | return err; |
| 1026 | } |
| 1027 | |
| 1028 | err = tegra_pcie_power_on(pcie); |
| 1029 | if (err) { |
| 1030 | dev_err(&pdev->dev, "failed to power up: %d\n", err); |
| 1031 | return err; |
| 1032 | } |
| 1033 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1034 | pads = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pads"); |
Julia Lawall | dc05ee3 | 2013-08-26 11:11:09 +0200 | [diff] [blame] | 1035 | pcie->pads = devm_ioremap_resource(&pdev->dev, pads); |
| 1036 | if (IS_ERR(pcie->pads)) { |
| 1037 | err = PTR_ERR(pcie->pads); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1038 | goto poweroff; |
| 1039 | } |
| 1040 | |
| 1041 | afi = platform_get_resource_byname(pdev, IORESOURCE_MEM, "afi"); |
Julia Lawall | dc05ee3 | 2013-08-26 11:11:09 +0200 | [diff] [blame] | 1042 | pcie->afi = devm_ioremap_resource(&pdev->dev, afi); |
| 1043 | if (IS_ERR(pcie->afi)) { |
| 1044 | err = PTR_ERR(pcie->afi); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1045 | goto poweroff; |
| 1046 | } |
| 1047 | |
Julia Lawall | dc05ee3 | 2013-08-26 11:11:09 +0200 | [diff] [blame] | 1048 | /* request configuration space, but remap later, on demand */ |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1049 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs"); |
| 1050 | if (!res) { |
| 1051 | err = -EADDRNOTAVAIL; |
| 1052 | goto poweroff; |
| 1053 | } |
| 1054 | |
| 1055 | pcie->cs = devm_request_mem_region(pcie->dev, res->start, |
| 1056 | resource_size(res), res->name); |
| 1057 | if (!pcie->cs) { |
| 1058 | err = -EADDRNOTAVAIL; |
| 1059 | goto poweroff; |
| 1060 | } |
| 1061 | |
| 1062 | /* request interrupt */ |
| 1063 | err = platform_get_irq_byname(pdev, "intr"); |
| 1064 | if (err < 0) { |
| 1065 | dev_err(&pdev->dev, "failed to get IRQ: %d\n", err); |
| 1066 | goto poweroff; |
| 1067 | } |
| 1068 | |
| 1069 | pcie->irq = err; |
| 1070 | |
| 1071 | err = request_irq(pcie->irq, tegra_pcie_isr, IRQF_SHARED, "PCIE", pcie); |
| 1072 | if (err) { |
| 1073 | dev_err(&pdev->dev, "failed to register IRQ: %d\n", err); |
| 1074 | goto poweroff; |
| 1075 | } |
| 1076 | |
| 1077 | return 0; |
| 1078 | |
| 1079 | poweroff: |
| 1080 | tegra_pcie_power_off(pcie); |
| 1081 | return err; |
| 1082 | } |
| 1083 | |
| 1084 | static int tegra_pcie_put_resources(struct tegra_pcie *pcie) |
| 1085 | { |
| 1086 | if (pcie->irq > 0) |
| 1087 | free_irq(pcie->irq, pcie); |
| 1088 | |
| 1089 | tegra_pcie_power_off(pcie); |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | static int tegra_msi_alloc(struct tegra_msi *chip) |
| 1094 | { |
| 1095 | int msi; |
| 1096 | |
| 1097 | mutex_lock(&chip->lock); |
| 1098 | |
| 1099 | msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR); |
| 1100 | if (msi < INT_PCI_MSI_NR) |
| 1101 | set_bit(msi, chip->used); |
| 1102 | else |
| 1103 | msi = -ENOSPC; |
| 1104 | |
| 1105 | mutex_unlock(&chip->lock); |
| 1106 | |
| 1107 | return msi; |
| 1108 | } |
| 1109 | |
| 1110 | static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq) |
| 1111 | { |
| 1112 | struct device *dev = chip->chip.dev; |
| 1113 | |
| 1114 | mutex_lock(&chip->lock); |
| 1115 | |
| 1116 | if (!test_bit(irq, chip->used)) |
| 1117 | dev_err(dev, "trying to free unused MSI#%lu\n", irq); |
| 1118 | else |
| 1119 | clear_bit(irq, chip->used); |
| 1120 | |
| 1121 | mutex_unlock(&chip->lock); |
| 1122 | } |
| 1123 | |
| 1124 | static irqreturn_t tegra_pcie_msi_irq(int irq, void *data) |
| 1125 | { |
| 1126 | struct tegra_pcie *pcie = data; |
| 1127 | struct tegra_msi *msi = &pcie->msi; |
| 1128 | unsigned int i, processed = 0; |
| 1129 | |
| 1130 | for (i = 0; i < 8; i++) { |
| 1131 | unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); |
| 1132 | |
| 1133 | while (reg) { |
| 1134 | unsigned int offset = find_first_bit(®, 32); |
| 1135 | unsigned int index = i * 32 + offset; |
| 1136 | unsigned int irq; |
| 1137 | |
| 1138 | /* clear the interrupt */ |
| 1139 | afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4); |
| 1140 | |
| 1141 | irq = irq_find_mapping(msi->domain, index); |
| 1142 | if (irq) { |
| 1143 | if (test_bit(index, msi->used)) |
| 1144 | generic_handle_irq(irq); |
| 1145 | else |
| 1146 | dev_info(pcie->dev, "unhandled MSI\n"); |
| 1147 | } else { |
| 1148 | /* |
| 1149 | * that's weird who triggered this? |
| 1150 | * just clear it |
| 1151 | */ |
| 1152 | dev_info(pcie->dev, "unexpected MSI\n"); |
| 1153 | } |
| 1154 | |
| 1155 | /* see if there's any more pending in this vector */ |
| 1156 | reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4); |
| 1157 | |
| 1158 | processed++; |
| 1159 | } |
| 1160 | } |
| 1161 | |
| 1162 | return processed > 0 ? IRQ_HANDLED : IRQ_NONE; |
| 1163 | } |
| 1164 | |
| 1165 | static int tegra_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev, |
| 1166 | struct msi_desc *desc) |
| 1167 | { |
| 1168 | struct tegra_msi *msi = to_tegra_msi(chip); |
| 1169 | struct msi_msg msg; |
| 1170 | unsigned int irq; |
| 1171 | int hwirq; |
| 1172 | |
| 1173 | hwirq = tegra_msi_alloc(msi); |
| 1174 | if (hwirq < 0) |
| 1175 | return hwirq; |
| 1176 | |
| 1177 | irq = irq_create_mapping(msi->domain, hwirq); |
| 1178 | if (!irq) |
| 1179 | return -EINVAL; |
| 1180 | |
| 1181 | irq_set_msi_desc(irq, desc); |
| 1182 | |
| 1183 | msg.address_lo = virt_to_phys((void *)msi->pages); |
| 1184 | /* 32 bit address only */ |
| 1185 | msg.address_hi = 0; |
| 1186 | msg.data = hwirq; |
| 1187 | |
| 1188 | write_msi_msg(irq, &msg); |
| 1189 | |
| 1190 | return 0; |
| 1191 | } |
| 1192 | |
| 1193 | static void tegra_msi_teardown_irq(struct msi_chip *chip, unsigned int irq) |
| 1194 | { |
| 1195 | struct tegra_msi *msi = to_tegra_msi(chip); |
| 1196 | struct irq_data *d = irq_get_irq_data(irq); |
| 1197 | |
| 1198 | tegra_msi_free(msi, d->hwirq); |
| 1199 | } |
| 1200 | |
| 1201 | static struct irq_chip tegra_msi_irq_chip = { |
| 1202 | .name = "Tegra PCIe MSI", |
| 1203 | .irq_enable = unmask_msi_irq, |
| 1204 | .irq_disable = mask_msi_irq, |
| 1205 | .irq_mask = mask_msi_irq, |
| 1206 | .irq_unmask = unmask_msi_irq, |
| 1207 | }; |
| 1208 | |
| 1209 | static int tegra_msi_map(struct irq_domain *domain, unsigned int irq, |
| 1210 | irq_hw_number_t hwirq) |
| 1211 | { |
| 1212 | irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq); |
| 1213 | irq_set_chip_data(irq, domain->host_data); |
| 1214 | set_irq_flags(irq, IRQF_VALID); |
| 1215 | |
Stephen Warren | b4f1737 | 2013-05-06 14:19:19 -0600 | [diff] [blame] | 1216 | tegra_cpuidle_pcie_irqs_in_use(); |
| 1217 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1218 | return 0; |
| 1219 | } |
| 1220 | |
| 1221 | static const struct irq_domain_ops msi_domain_ops = { |
| 1222 | .map = tegra_msi_map, |
| 1223 | }; |
| 1224 | |
| 1225 | static int tegra_pcie_enable_msi(struct tegra_pcie *pcie) |
| 1226 | { |
| 1227 | struct platform_device *pdev = to_platform_device(pcie->dev); |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1228 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1229 | struct tegra_msi *msi = &pcie->msi; |
| 1230 | unsigned long base; |
| 1231 | int err; |
| 1232 | u32 reg; |
| 1233 | |
| 1234 | mutex_init(&msi->lock); |
| 1235 | |
| 1236 | msi->chip.dev = pcie->dev; |
| 1237 | msi->chip.setup_irq = tegra_msi_setup_irq; |
| 1238 | msi->chip.teardown_irq = tegra_msi_teardown_irq; |
| 1239 | |
| 1240 | msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR, |
| 1241 | &msi_domain_ops, &msi->chip); |
| 1242 | if (!msi->domain) { |
| 1243 | dev_err(&pdev->dev, "failed to create IRQ domain\n"); |
| 1244 | return -ENOMEM; |
| 1245 | } |
| 1246 | |
| 1247 | err = platform_get_irq_byname(pdev, "msi"); |
| 1248 | if (err < 0) { |
| 1249 | dev_err(&pdev->dev, "failed to get IRQ: %d\n", err); |
| 1250 | goto err; |
| 1251 | } |
| 1252 | |
| 1253 | msi->irq = err; |
| 1254 | |
| 1255 | err = request_irq(msi->irq, tegra_pcie_msi_irq, 0, |
| 1256 | tegra_msi_irq_chip.name, pcie); |
| 1257 | if (err < 0) { |
| 1258 | dev_err(&pdev->dev, "failed to request IRQ: %d\n", err); |
| 1259 | goto err; |
| 1260 | } |
| 1261 | |
| 1262 | /* setup AFI/FPCI range */ |
| 1263 | msi->pages = __get_free_pages(GFP_KERNEL, 0); |
| 1264 | base = virt_to_phys((void *)msi->pages); |
| 1265 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1266 | afi_writel(pcie, base >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1267 | afi_writel(pcie, base, AFI_MSI_AXI_BAR_ST); |
| 1268 | /* this register is in 4K increments */ |
| 1269 | afi_writel(pcie, 1, AFI_MSI_BAR_SZ); |
| 1270 | |
| 1271 | /* enable all MSI vectors */ |
| 1272 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0); |
| 1273 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1); |
| 1274 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2); |
| 1275 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3); |
| 1276 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4); |
| 1277 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5); |
| 1278 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6); |
| 1279 | afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7); |
| 1280 | |
| 1281 | /* and unmask the MSI interrupt */ |
| 1282 | reg = afi_readl(pcie, AFI_INTR_MASK); |
| 1283 | reg |= AFI_INTR_MASK_MSI_MASK; |
| 1284 | afi_writel(pcie, reg, AFI_INTR_MASK); |
| 1285 | |
| 1286 | return 0; |
| 1287 | |
| 1288 | err: |
| 1289 | irq_domain_remove(msi->domain); |
| 1290 | return err; |
| 1291 | } |
| 1292 | |
| 1293 | static int tegra_pcie_disable_msi(struct tegra_pcie *pcie) |
| 1294 | { |
| 1295 | struct tegra_msi *msi = &pcie->msi; |
| 1296 | unsigned int i, irq; |
| 1297 | u32 value; |
| 1298 | |
| 1299 | /* mask the MSI interrupt */ |
| 1300 | value = afi_readl(pcie, AFI_INTR_MASK); |
| 1301 | value &= ~AFI_INTR_MASK_MSI_MASK; |
| 1302 | afi_writel(pcie, value, AFI_INTR_MASK); |
| 1303 | |
| 1304 | /* disable all MSI vectors */ |
| 1305 | afi_writel(pcie, 0, AFI_MSI_EN_VEC0); |
| 1306 | afi_writel(pcie, 0, AFI_MSI_EN_VEC1); |
| 1307 | afi_writel(pcie, 0, AFI_MSI_EN_VEC2); |
| 1308 | afi_writel(pcie, 0, AFI_MSI_EN_VEC3); |
| 1309 | afi_writel(pcie, 0, AFI_MSI_EN_VEC4); |
| 1310 | afi_writel(pcie, 0, AFI_MSI_EN_VEC5); |
| 1311 | afi_writel(pcie, 0, AFI_MSI_EN_VEC6); |
| 1312 | afi_writel(pcie, 0, AFI_MSI_EN_VEC7); |
| 1313 | |
| 1314 | free_pages(msi->pages, 0); |
| 1315 | |
| 1316 | if (msi->irq > 0) |
| 1317 | free_irq(msi->irq, pcie); |
| 1318 | |
| 1319 | for (i = 0; i < INT_PCI_MSI_NR; i++) { |
| 1320 | irq = irq_find_mapping(msi->domain, i); |
| 1321 | if (irq > 0) |
| 1322 | irq_dispose_mapping(irq); |
| 1323 | } |
| 1324 | |
| 1325 | irq_domain_remove(msi->domain); |
| 1326 | |
| 1327 | return 0; |
| 1328 | } |
| 1329 | |
| 1330 | static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes, |
| 1331 | u32 *xbar) |
| 1332 | { |
| 1333 | struct device_node *np = pcie->dev->of_node; |
| 1334 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1335 | if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) { |
| 1336 | switch (lanes) { |
| 1337 | case 0x00000204: |
| 1338 | dev_info(pcie->dev, "4x1, 2x1 configuration\n"); |
| 1339 | *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420; |
| 1340 | return 0; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1341 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1342 | case 0x00020202: |
| 1343 | dev_info(pcie->dev, "2x3 configuration\n"); |
| 1344 | *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222; |
| 1345 | return 0; |
| 1346 | |
| 1347 | case 0x00010104: |
| 1348 | dev_info(pcie->dev, "4x1, 1x2 configuration\n"); |
| 1349 | *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411; |
| 1350 | return 0; |
| 1351 | } |
| 1352 | } else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) { |
| 1353 | switch (lanes) { |
| 1354 | case 0x00000004: |
| 1355 | dev_info(pcie->dev, "single-mode configuration\n"); |
| 1356 | *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE; |
| 1357 | return 0; |
| 1358 | |
| 1359 | case 0x00000202: |
| 1360 | dev_info(pcie->dev, "dual-mode configuration\n"); |
| 1361 | *xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL; |
| 1362 | return 0; |
| 1363 | } |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1364 | } |
| 1365 | |
| 1366 | return -EINVAL; |
| 1367 | } |
| 1368 | |
| 1369 | static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) |
| 1370 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1371 | const struct tegra_pcie_soc_data *soc = pcie->soc_data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1372 | struct device_node *np = pcie->dev->of_node, *port; |
| 1373 | struct of_pci_range_parser parser; |
| 1374 | struct of_pci_range range; |
| 1375 | struct resource res; |
| 1376 | u32 lanes = 0; |
| 1377 | int err; |
| 1378 | |
| 1379 | if (of_pci_range_parser_init(&parser, np)) { |
| 1380 | dev_err(pcie->dev, "missing \"ranges\" property\n"); |
| 1381 | return -EINVAL; |
| 1382 | } |
| 1383 | |
| 1384 | pcie->vdd_supply = devm_regulator_get(pcie->dev, "vdd"); |
| 1385 | if (IS_ERR(pcie->vdd_supply)) |
| 1386 | return PTR_ERR(pcie->vdd_supply); |
| 1387 | |
| 1388 | pcie->pex_clk_supply = devm_regulator_get(pcie->dev, "pex-clk"); |
| 1389 | if (IS_ERR(pcie->pex_clk_supply)) |
| 1390 | return PTR_ERR(pcie->pex_clk_supply); |
| 1391 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1392 | if (soc->has_avdd_supply) { |
| 1393 | pcie->avdd_supply = devm_regulator_get(pcie->dev, "avdd"); |
| 1394 | if (IS_ERR(pcie->avdd_supply)) |
| 1395 | return PTR_ERR(pcie->avdd_supply); |
| 1396 | } |
| 1397 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1398 | for_each_of_pci_range(&parser, &range) { |
| 1399 | of_pci_range_to_resource(&range, np, &res); |
| 1400 | |
| 1401 | switch (res.flags & IORESOURCE_TYPE_BITS) { |
| 1402 | case IORESOURCE_IO: |
| 1403 | memcpy(&pcie->io, &res, sizeof(res)); |
| 1404 | pcie->io.name = "I/O"; |
| 1405 | break; |
| 1406 | |
| 1407 | case IORESOURCE_MEM: |
| 1408 | if (res.flags & IORESOURCE_PREFETCH) { |
| 1409 | memcpy(&pcie->prefetch, &res, sizeof(res)); |
| 1410 | pcie->prefetch.name = "PREFETCH"; |
| 1411 | } else { |
| 1412 | memcpy(&pcie->mem, &res, sizeof(res)); |
| 1413 | pcie->mem.name = "MEM"; |
| 1414 | } |
| 1415 | break; |
| 1416 | } |
| 1417 | } |
| 1418 | |
| 1419 | err = of_pci_parse_bus_range(np, &pcie->busn); |
| 1420 | if (err < 0) { |
| 1421 | dev_err(pcie->dev, "failed to parse ranges property: %d\n", |
| 1422 | err); |
| 1423 | pcie->busn.name = np->name; |
| 1424 | pcie->busn.start = 0; |
| 1425 | pcie->busn.end = 0xff; |
| 1426 | pcie->busn.flags = IORESOURCE_BUS; |
| 1427 | } |
| 1428 | |
| 1429 | /* parse root ports */ |
| 1430 | for_each_child_of_node(np, port) { |
| 1431 | struct tegra_pcie_port *rp; |
| 1432 | unsigned int index; |
| 1433 | u32 value; |
| 1434 | |
| 1435 | err = of_pci_get_devfn(port); |
| 1436 | if (err < 0) { |
| 1437 | dev_err(pcie->dev, "failed to parse address: %d\n", |
| 1438 | err); |
| 1439 | return err; |
| 1440 | } |
| 1441 | |
| 1442 | index = PCI_SLOT(err); |
| 1443 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1444 | if (index < 1 || index > soc->num_ports) { |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1445 | dev_err(pcie->dev, "invalid port number: %d\n", index); |
| 1446 | return -EINVAL; |
| 1447 | } |
| 1448 | |
| 1449 | index--; |
| 1450 | |
| 1451 | err = of_property_read_u32(port, "nvidia,num-lanes", &value); |
| 1452 | if (err < 0) { |
| 1453 | dev_err(pcie->dev, "failed to parse # of lanes: %d\n", |
| 1454 | err); |
| 1455 | return err; |
| 1456 | } |
| 1457 | |
| 1458 | if (value > 16) { |
| 1459 | dev_err(pcie->dev, "invalid # of lanes: %u\n", value); |
| 1460 | return -EINVAL; |
| 1461 | } |
| 1462 | |
| 1463 | lanes |= value << (index << 3); |
| 1464 | |
| 1465 | if (!of_device_is_available(port)) |
| 1466 | continue; |
| 1467 | |
| 1468 | rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL); |
| 1469 | if (!rp) |
| 1470 | return -ENOMEM; |
| 1471 | |
| 1472 | err = of_address_to_resource(port, 0, &rp->regs); |
| 1473 | if (err < 0) { |
| 1474 | dev_err(pcie->dev, "failed to parse address: %d\n", |
| 1475 | err); |
| 1476 | return err; |
| 1477 | } |
| 1478 | |
| 1479 | INIT_LIST_HEAD(&rp->list); |
| 1480 | rp->index = index; |
| 1481 | rp->lanes = value; |
| 1482 | rp->pcie = pcie; |
| 1483 | |
Julia Lawall | dc05ee3 | 2013-08-26 11:11:09 +0200 | [diff] [blame] | 1484 | rp->base = devm_ioremap_resource(pcie->dev, &rp->regs); |
| 1485 | if (IS_ERR(rp->base)) |
| 1486 | return PTR_ERR(rp->base); |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1487 | |
| 1488 | list_add_tail(&rp->list, &pcie->ports); |
| 1489 | } |
| 1490 | |
| 1491 | err = tegra_pcie_get_xbar_config(pcie, lanes, &pcie->xbar_config); |
| 1492 | if (err < 0) { |
| 1493 | dev_err(pcie->dev, "invalid lane configuration\n"); |
| 1494 | return err; |
| 1495 | } |
| 1496 | |
| 1497 | return 0; |
| 1498 | } |
| 1499 | |
| 1500 | /* |
| 1501 | * FIXME: If there are no PCIe cards attached, then calling this function |
| 1502 | * can result in the increase of the bootup time as there are big timeout |
| 1503 | * loops. |
| 1504 | */ |
| 1505 | #define TEGRA_PCIE_LINKUP_TIMEOUT 200 /* up to 1.2 seconds */ |
| 1506 | static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port) |
| 1507 | { |
| 1508 | unsigned int retries = 3; |
| 1509 | unsigned long value; |
| 1510 | |
| 1511 | do { |
| 1512 | unsigned int timeout = TEGRA_PCIE_LINKUP_TIMEOUT; |
| 1513 | |
| 1514 | do { |
| 1515 | value = readl(port->base + RP_VEND_XP); |
| 1516 | |
| 1517 | if (value & RP_VEND_XP_DL_UP) |
| 1518 | break; |
| 1519 | |
| 1520 | usleep_range(1000, 2000); |
| 1521 | } while (--timeout); |
| 1522 | |
| 1523 | if (!timeout) { |
| 1524 | dev_err(port->pcie->dev, "link %u down, retrying\n", |
| 1525 | port->index); |
| 1526 | goto retry; |
| 1527 | } |
| 1528 | |
| 1529 | timeout = TEGRA_PCIE_LINKUP_TIMEOUT; |
| 1530 | |
| 1531 | do { |
| 1532 | value = readl(port->base + RP_LINK_CONTROL_STATUS); |
| 1533 | |
| 1534 | if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE) |
| 1535 | return true; |
| 1536 | |
| 1537 | usleep_range(1000, 2000); |
| 1538 | } while (--timeout); |
| 1539 | |
| 1540 | retry: |
| 1541 | tegra_pcie_port_reset(port); |
| 1542 | } while (--retries); |
| 1543 | |
| 1544 | return false; |
| 1545 | } |
| 1546 | |
| 1547 | static int tegra_pcie_enable(struct tegra_pcie *pcie) |
| 1548 | { |
| 1549 | struct tegra_pcie_port *port, *tmp; |
| 1550 | struct hw_pci hw; |
| 1551 | |
| 1552 | list_for_each_entry_safe(port, tmp, &pcie->ports, list) { |
| 1553 | dev_info(pcie->dev, "probing port %u, using %u lanes\n", |
| 1554 | port->index, port->lanes); |
| 1555 | |
| 1556 | tegra_pcie_port_enable(port); |
| 1557 | |
| 1558 | if (tegra_pcie_port_check_link(port)) |
| 1559 | continue; |
| 1560 | |
| 1561 | dev_info(pcie->dev, "link %u down, ignoring\n", port->index); |
| 1562 | |
| 1563 | tegra_pcie_port_disable(port); |
| 1564 | tegra_pcie_port_free(port); |
| 1565 | } |
| 1566 | |
| 1567 | memset(&hw, 0, sizeof(hw)); |
| 1568 | |
| 1569 | hw.nr_controllers = 1; |
| 1570 | hw.private_data = (void **)&pcie; |
| 1571 | hw.setup = tegra_pcie_setup; |
| 1572 | hw.map_irq = tegra_pcie_map_irq; |
| 1573 | hw.add_bus = tegra_pcie_add_bus; |
| 1574 | hw.scan = tegra_pcie_scan_bus; |
| 1575 | hw.ops = &tegra_pcie_ops; |
| 1576 | |
| 1577 | pci_common_init_dev(pcie->dev, &hw); |
| 1578 | |
| 1579 | return 0; |
| 1580 | } |
| 1581 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1582 | static const struct tegra_pcie_soc_data tegra20_pcie_data = { |
| 1583 | .num_ports = 2, |
| 1584 | .msi_base_shift = 0, |
| 1585 | .pads_pll_ctl = PADS_PLL_CTL_TEGRA20, |
| 1586 | .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10, |
| 1587 | .has_pex_clkreq_en = false, |
| 1588 | .has_pex_bias_ctrl = false, |
| 1589 | .has_intr_prsnt_sense = false, |
| 1590 | .has_avdd_supply = false, |
| 1591 | .has_cml_clk = false, |
| 1592 | }; |
| 1593 | |
| 1594 | static const struct tegra_pcie_soc_data tegra30_pcie_data = { |
| 1595 | .num_ports = 3, |
| 1596 | .msi_base_shift = 8, |
| 1597 | .pads_pll_ctl = PADS_PLL_CTL_TEGRA30, |
| 1598 | .tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN, |
| 1599 | .has_pex_clkreq_en = true, |
| 1600 | .has_pex_bias_ctrl = true, |
| 1601 | .has_intr_prsnt_sense = true, |
| 1602 | .has_avdd_supply = true, |
| 1603 | .has_cml_clk = true, |
| 1604 | }; |
| 1605 | |
| 1606 | static const struct of_device_id tegra_pcie_of_match[] = { |
| 1607 | { .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie_data }, |
| 1608 | { .compatible = "nvidia,tegra20-pcie", .data = &tegra20_pcie_data }, |
| 1609 | { }, |
| 1610 | }; |
| 1611 | MODULE_DEVICE_TABLE(of, tegra_pcie_of_match); |
| 1612 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1613 | static int tegra_pcie_probe(struct platform_device *pdev) |
| 1614 | { |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1615 | const struct of_device_id *match; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1616 | struct tegra_pcie *pcie; |
| 1617 | int err; |
| 1618 | |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1619 | match = of_match_device(tegra_pcie_of_match, &pdev->dev); |
| 1620 | if (!match) |
| 1621 | return -ENODEV; |
| 1622 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1623 | pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL); |
| 1624 | if (!pcie) |
| 1625 | return -ENOMEM; |
| 1626 | |
| 1627 | INIT_LIST_HEAD(&pcie->busses); |
| 1628 | INIT_LIST_HEAD(&pcie->ports); |
Jay Agarwal | 94716cd | 2013-08-09 16:49:24 +0200 | [diff] [blame] | 1629 | pcie->soc_data = match->data; |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1630 | pcie->dev = &pdev->dev; |
| 1631 | |
| 1632 | err = tegra_pcie_parse_dt(pcie); |
| 1633 | if (err < 0) |
| 1634 | return err; |
| 1635 | |
| 1636 | pcibios_min_mem = 0; |
| 1637 | |
| 1638 | err = tegra_pcie_get_resources(pcie); |
| 1639 | if (err < 0) { |
| 1640 | dev_err(&pdev->dev, "failed to request resources: %d\n", err); |
| 1641 | return err; |
| 1642 | } |
| 1643 | |
| 1644 | err = tegra_pcie_enable_controller(pcie); |
| 1645 | if (err) |
| 1646 | goto put_resources; |
| 1647 | |
| 1648 | /* setup the AFI address translations */ |
| 1649 | tegra_pcie_setup_translations(pcie); |
| 1650 | |
| 1651 | if (IS_ENABLED(CONFIG_PCI_MSI)) { |
| 1652 | err = tegra_pcie_enable_msi(pcie); |
| 1653 | if (err < 0) { |
| 1654 | dev_err(&pdev->dev, |
| 1655 | "failed to enable MSI support: %d\n", |
| 1656 | err); |
| 1657 | goto put_resources; |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | err = tegra_pcie_enable(pcie); |
| 1662 | if (err < 0) { |
| 1663 | dev_err(&pdev->dev, "failed to enable PCIe ports: %d\n", err); |
| 1664 | goto disable_msi; |
| 1665 | } |
| 1666 | |
| 1667 | platform_set_drvdata(pdev, pcie); |
| 1668 | return 0; |
| 1669 | |
| 1670 | disable_msi: |
| 1671 | if (IS_ENABLED(CONFIG_PCI_MSI)) |
| 1672 | tegra_pcie_disable_msi(pcie); |
| 1673 | put_resources: |
| 1674 | tegra_pcie_put_resources(pcie); |
| 1675 | return err; |
| 1676 | } |
| 1677 | |
Thierry Reding | d1523b5 | 2013-08-09 16:49:19 +0200 | [diff] [blame] | 1678 | static struct platform_driver tegra_pcie_driver = { |
| 1679 | .driver = { |
| 1680 | .name = "tegra-pcie", |
| 1681 | .owner = THIS_MODULE, |
| 1682 | .of_match_table = tegra_pcie_of_match, |
| 1683 | .suppress_bind_attrs = true, |
| 1684 | }, |
| 1685 | .probe = tegra_pcie_probe, |
| 1686 | }; |
| 1687 | module_platform_driver(tegra_pcie_driver); |
| 1688 | |
| 1689 | MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); |
| 1690 | MODULE_DESCRIPTION("NVIDIA Tegra PCIe driver"); |
| 1691 | MODULE_LICENSE("GPLv2"); |