Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 1 | /* Copyright (c) 2012, Code Aurora Forum. All rights reserved. |
| 2 | * |
| 3 | * This program is free software; you can redistribute it and/or modify |
| 4 | * it under the terms of the GNU General Public License version 2 and |
| 5 | * only version 2 as published by the Free Software Foundation. |
| 6 | * |
| 7 | * This program is distributed in the hope that it will be useful, |
| 8 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 9 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 10 | * GNU General Public License for more details. |
| 11 | */ |
| 12 | |
| 13 | #define pr_fmt(fmt) "%s: " fmt, __func__ |
| 14 | |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/err.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/kernel.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/spmi.h> |
| 22 | #include <linux/of.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/of_spmi.h> |
Steve Muckle | f132c6c | 2012-06-06 18:30:57 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 26 | #include <mach/qpnp-int.h> |
| 27 | |
| 28 | #define SPMI_PMIC_ARB_NAME "spmi_pmic_arb" |
| 29 | |
| 30 | /* PMIC Arbiter configuration registers */ |
| 31 | #define PMIC_ARB_VERSION 0x0000 |
| 32 | #define PMIC_ARB_INT_EN 0x0004 |
| 33 | |
| 34 | /* PMIC Arbiter channel registers */ |
| 35 | #define PMIC_ARB_CMD(N) (0x0800 + (0x80 * (N))) |
| 36 | #define PMIC_ARB_CONFIG(N) (0x0804 + (0x80 * (N))) |
| 37 | #define PMIC_ARB_STATUS(N) (0x0808 + (0x80 * (N))) |
| 38 | #define PMIC_ARB_WDATA0(N) (0x0810 + (0x80 * (N))) |
| 39 | #define PMIC_ARB_WDATA1(N) (0x0814 + (0x80 * (N))) |
| 40 | #define PMIC_ARB_RDATA0(N) (0x0818 + (0x80 * (N))) |
| 41 | #define PMIC_ARB_RDATA1(N) (0x081C + (0x80 * (N))) |
| 42 | |
| 43 | /* Interrupt Controller */ |
| 44 | #define SPMI_PIC_OWNER_ACC_STATUS(M, N) (0x0000 + ((32 * (M)) + (4 * (N)))) |
| 45 | #define SPMI_PIC_ACC_ENABLE(N) (0x0200 + (4 * (N))) |
| 46 | #define SPMI_PIC_IRQ_STATUS(N) (0x0600 + (4 * (N))) |
| 47 | #define SPMI_PIC_IRQ_CLEAR(N) (0x0A00 + (4 * (N))) |
| 48 | |
| 49 | /* Channel Status fields */ |
| 50 | enum pmic_arb_chnl_status { |
| 51 | PMIC_ARB_STATUS_DONE = (1 << 0), |
| 52 | PMIC_ARB_STATUS_FAILURE = (1 << 1), |
| 53 | PMIC_ARB_STATUS_DENIED = (1 << 2), |
| 54 | PMIC_ARB_STATUS_DROPPED = (1 << 3), |
| 55 | }; |
| 56 | |
| 57 | /* Command register fields */ |
| 58 | #define PMIC_ARB_CMD_MAX_BYTE_COUNT 8 |
| 59 | |
| 60 | /* Command Opcodes */ |
| 61 | enum pmic_arb_cmd_op_code { |
| 62 | PMIC_ARB_OP_EXT_WRITEL = 0, |
| 63 | PMIC_ARB_OP_EXT_READL = 1, |
| 64 | PMIC_ARB_OP_EXT_WRITE = 2, |
| 65 | PMIC_ARB_OP_RESET = 3, |
| 66 | PMIC_ARB_OP_SLEEP = 4, |
| 67 | PMIC_ARB_OP_SHUTDOWN = 5, |
| 68 | PMIC_ARB_OP_WAKEUP = 6, |
| 69 | PMIC_ARB_OP_AUTHENTICATE = 7, |
| 70 | PMIC_ARB_OP_MSTR_READ = 8, |
| 71 | PMIC_ARB_OP_MSTR_WRITE = 9, |
| 72 | PMIC_ARB_OP_EXT_READ = 13, |
| 73 | PMIC_ARB_OP_WRITE = 14, |
| 74 | PMIC_ARB_OP_READ = 15, |
| 75 | PMIC_ARB_OP_ZERO_WRITE = 16, |
| 76 | }; |
| 77 | |
| 78 | /* Maximum number of support PMIC peripherals */ |
| 79 | #define PMIC_ARB_MAX_PERIPHS 256 |
| 80 | #define PMIC_ARB_PERIPH_ID_VALID (1 << 15) |
| 81 | #define PMIC_ARB_TIMEOUT_US 100 |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 82 | #define PMIC_ARB_MAX_TRANS_BYTES (8) |
Gilad Avidov | a11c0b5 | 2012-02-15 15:30:49 -0700 | [diff] [blame] | 83 | |
| 84 | #define PMIC_ARB_APID_MASK 0xFF |
| 85 | #define PMIC_ARB_PPID_MASK 0xFFF |
| 86 | /* extract PPID and APID from interrupt map in .dts config file format */ |
| 87 | #define PMIC_ARB_DEV_TRE_2_PPID(MAP_COMPRS_VAL) \ |
| 88 | ((MAP_COMPRS_VAL) >> (20)) |
| 89 | #define PMIC_ARB_DEV_TRE_2_APID(MAP_COMPRS_VAL) \ |
| 90 | ((MAP_COMPRS_VAL) & PMIC_ARB_APID_MASK) |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 91 | |
| 92 | /** |
| 93 | * base - base address of the PMIC Arbiter core registers. |
| 94 | * intr - base address of the SPMI interrupt control registers |
| 95 | */ |
| 96 | struct spmi_pmic_arb_dev { |
| 97 | struct spmi_controller controller; |
| 98 | struct device *dev; |
| 99 | struct device *slave; |
| 100 | void __iomem *base; |
| 101 | void __iomem *intr; |
| 102 | int pic_irq; |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 103 | spinlock_t lock; |
| 104 | u8 owner; |
| 105 | u8 channel; |
| 106 | u8 min_apid; |
| 107 | u8 max_apid; |
| 108 | u16 periph_id_map[PMIC_ARB_MAX_PERIPHS]; |
| 109 | }; |
| 110 | |
| 111 | static u32 pmic_arb_read(struct spmi_pmic_arb_dev *dev, u32 offset) |
| 112 | { |
| 113 | u32 val = readl_relaxed(dev->base + offset); |
| 114 | pr_debug("address 0x%p, val 0x%x\n", dev->base + offset, val); |
| 115 | return val; |
| 116 | } |
| 117 | |
| 118 | static void pmic_arb_write(struct spmi_pmic_arb_dev *dev, u32 offset, u32 val) |
| 119 | { |
| 120 | pr_debug("address 0x%p, val 0x%x\n", dev->base + offset, val); |
| 121 | writel_relaxed(val, dev->base + offset); |
| 122 | } |
| 123 | |
| 124 | static int pmic_arb_wait_for_done(struct spmi_pmic_arb_dev *dev) |
| 125 | { |
| 126 | u32 status = 0; |
| 127 | u32 timeout = PMIC_ARB_TIMEOUT_US; |
| 128 | u32 offset = PMIC_ARB_STATUS(dev->channel); |
| 129 | |
| 130 | while (timeout--) { |
| 131 | status = pmic_arb_read(dev, offset); |
| 132 | |
| 133 | if (status & PMIC_ARB_STATUS_DONE) { |
| 134 | if (status & PMIC_ARB_STATUS_DENIED) { |
| 135 | dev_err(dev->dev, |
| 136 | "%s: transaction denied (0x%x)\n", |
| 137 | __func__, status); |
| 138 | return -EPERM; |
| 139 | } |
| 140 | |
| 141 | if (status & PMIC_ARB_STATUS_FAILURE) { |
| 142 | dev_err(dev->dev, |
| 143 | "%s: transaction failed (0x%x)\n", |
| 144 | __func__, status); |
| 145 | return -EIO; |
| 146 | } |
| 147 | |
| 148 | if (status & PMIC_ARB_STATUS_DROPPED) { |
| 149 | dev_err(dev->dev, |
| 150 | "%s: transaction dropped (0x%x)\n", |
| 151 | __func__, status); |
| 152 | return -EIO; |
| 153 | } |
| 154 | |
| 155 | return 0; |
| 156 | } |
| 157 | udelay(1); |
| 158 | } |
| 159 | |
| 160 | dev_err(dev->dev, "%s: timeout, status 0x%x\n", __func__, status); |
| 161 | return -ETIMEDOUT; |
| 162 | } |
| 163 | |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 164 | /** |
| 165 | * pa_read_data: reads pmic-arb's register and copy 1..4 bytes to buf |
| 166 | * @bc byte count -1. range: 0..3 |
| 167 | * @reg register's address |
| 168 | * @buf output parameter, length must be bc+1 |
| 169 | */ |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 170 | static void pa_read_data(struct spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc) |
| 171 | { |
| 172 | u32 data = pmic_arb_read(dev, reg); |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 173 | memcpy(buf, &data, (bc & 3) + 1); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 176 | /** |
| 177 | * pa_write_data: write 1..4 bytes from buf to pmic-arb's register |
| 178 | * @bc byte-count -1. range: 0..3 |
| 179 | * @reg register's address |
| 180 | * @buf buffer to write. length must be bc+1 |
| 181 | */ |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 182 | static void |
| 183 | pa_write_data(struct spmi_pmic_arb_dev *dev, u8 *buf, u32 reg, u8 bc) |
| 184 | { |
| 185 | u32 data = 0; |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 186 | memcpy(&data, buf, (bc & 3) + 1); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 187 | pmic_arb_write(dev, reg, data); |
| 188 | } |
| 189 | |
| 190 | /* Non-data command */ |
| 191 | static int pmic_arb_cmd(struct spmi_controller *ctrl, u8 opc, u8 sid) |
| 192 | { |
| 193 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 194 | unsigned long flags; |
| 195 | u32 cmd; |
| 196 | int rc; |
| 197 | |
| 198 | pr_debug("op:0x%x sid:%d\n", opc, sid); |
| 199 | |
| 200 | /* Check for valid non-data command */ |
| 201 | if (opc < SPMI_CMD_RESET || opc > SPMI_CMD_WAKEUP) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | cmd = ((opc | 0x40) << 27) | ((sid & 0xf) << 20); |
| 205 | |
| 206 | spin_lock_irqsave(&pmic_arb->lock, flags); |
| 207 | pmic_arb_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd); |
| 208 | rc = pmic_arb_wait_for_done(pmic_arb); |
| 209 | spin_unlock_irqrestore(&pmic_arb->lock, flags); |
| 210 | |
| 211 | return rc; |
| 212 | } |
| 213 | |
| 214 | static int pmic_arb_read_cmd(struct spmi_controller *ctrl, |
| 215 | u8 opc, u8 sid, u16 addr, u8 bc, u8 *buf) |
| 216 | { |
| 217 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 218 | unsigned long flags; |
| 219 | u32 cmd; |
| 220 | int rc; |
| 221 | |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 222 | if (bc >= PMIC_ARB_MAX_TRANS_BYTES) { |
| 223 | dev_err(pmic_arb->dev |
| 224 | , "pmic-arb supports 1..%d bytes per trans, but:%d requested" |
| 225 | , PMIC_ARB_MAX_TRANS_BYTES, bc+1); |
| 226 | return -EINVAL; |
| 227 | } |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 228 | pr_debug("op:0x%x sid:%d bc:%d addr:0x%x\n", opc, sid, bc, addr); |
| 229 | |
| 230 | /* Check the opcode */ |
| 231 | if (opc >= 0x60 && opc <= 0x7F) |
| 232 | opc = PMIC_ARB_OP_READ; |
| 233 | else if (opc >= 0x20 && opc <= 0x2F) |
| 234 | opc = PMIC_ARB_OP_EXT_READ; |
| 235 | else if (opc >= 0x38 && opc <= 0x3F) |
| 236 | opc = PMIC_ARB_OP_EXT_READL; |
| 237 | else |
| 238 | return -EINVAL; |
| 239 | |
| 240 | cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7); |
| 241 | |
| 242 | spin_lock_irqsave(&pmic_arb->lock, flags); |
| 243 | pmic_arb_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd); |
| 244 | rc = pmic_arb_wait_for_done(pmic_arb); |
| 245 | if (rc) |
| 246 | goto done; |
| 247 | |
| 248 | /* Read from FIFO, note 'bc' is actually number of bytes minus 1 */ |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 249 | pa_read_data(pmic_arb, buf, PMIC_ARB_RDATA0(pmic_arb->channel) |
| 250 | , min_t(u8, bc, 3)); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 251 | |
| 252 | if (bc > 3) |
| 253 | pa_read_data(pmic_arb, buf + 4, |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 254 | PMIC_ARB_RDATA1(pmic_arb->channel), bc - 4); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 255 | |
| 256 | done: |
| 257 | spin_unlock_irqrestore(&pmic_arb->lock, flags); |
| 258 | return rc; |
| 259 | } |
| 260 | |
| 261 | static int pmic_arb_write_cmd(struct spmi_controller *ctrl, |
| 262 | u8 opc, u8 sid, u16 addr, u8 bc, u8 *buf) |
| 263 | { |
| 264 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 265 | unsigned long flags; |
| 266 | u32 cmd; |
| 267 | int rc; |
| 268 | |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 269 | if (bc >= PMIC_ARB_MAX_TRANS_BYTES) { |
| 270 | dev_err(pmic_arb->dev |
| 271 | , "pmic-arb supports 1..%d bytes per trans, but:%d requested" |
| 272 | , PMIC_ARB_MAX_TRANS_BYTES, bc+1); |
| 273 | return -EINVAL; |
| 274 | } |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 275 | pr_debug("op:0x%x sid:%d bc:%d addr:0x%x\n", opc, sid, bc, addr); |
| 276 | |
| 277 | /* Check the opcode */ |
| 278 | if (opc >= 0x40 && opc <= 0x5F) |
| 279 | opc = PMIC_ARB_OP_WRITE; |
| 280 | else if (opc >= 0x00 && opc <= 0x0F) |
| 281 | opc = PMIC_ARB_OP_EXT_WRITE; |
| 282 | else if (opc >= 0x30 && opc <= 0x37) |
| 283 | opc = PMIC_ARB_OP_EXT_WRITEL; |
| 284 | else if (opc >= 0x80 && opc <= 0xFF) |
| 285 | opc = PMIC_ARB_OP_ZERO_WRITE; |
| 286 | else |
| 287 | return -EINVAL; |
| 288 | |
| 289 | cmd = (opc << 27) | ((sid & 0xf) << 20) | (addr << 4) | (bc & 0x7); |
| 290 | |
| 291 | /* Write data to FIFOs */ |
| 292 | spin_lock_irqsave(&pmic_arb->lock, flags); |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 293 | pa_write_data(pmic_arb, buf, PMIC_ARB_WDATA0(pmic_arb->channel) |
| 294 | , min_t(u8, bc, 3)); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 295 | if (bc > 3) |
| 296 | pa_write_data(pmic_arb, buf + 4, |
Gilad Avidov | e0c3f70 | 2012-07-12 13:19:12 -0600 | [diff] [blame^] | 297 | PMIC_ARB_WDATA1(pmic_arb->channel), bc - 4); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 298 | |
| 299 | /* Start the transaction */ |
| 300 | pmic_arb_write(pmic_arb, PMIC_ARB_CMD(pmic_arb->channel), cmd); |
| 301 | rc = pmic_arb_wait_for_done(pmic_arb); |
| 302 | spin_unlock_irqrestore(&pmic_arb->lock, flags); |
| 303 | |
| 304 | return rc; |
| 305 | } |
| 306 | |
| 307 | /* APID to PPID */ |
| 308 | static u16 get_peripheral_id(struct spmi_pmic_arb_dev *pmic_arb, u8 apid) |
| 309 | { |
| 310 | return pmic_arb->periph_id_map[apid] & PMIC_ARB_PPID_MASK; |
| 311 | } |
| 312 | |
| 313 | /* APID to PPID, returns valid flag */ |
| 314 | static int is_apid_valid(struct spmi_pmic_arb_dev *pmic_arb, u8 apid) |
| 315 | { |
| 316 | return pmic_arb->periph_id_map[apid] & PMIC_ARB_PERIPH_ID_VALID; |
| 317 | } |
| 318 | |
| 319 | /* PPID to APID */ |
| 320 | static uint32_t map_peripheral_id(struct spmi_pmic_arb_dev *pmic_arb, u16 ppid) |
| 321 | { |
| 322 | int first = pmic_arb->min_apid; |
| 323 | int last = pmic_arb->max_apid; |
| 324 | int i; |
| 325 | |
| 326 | /* Search table for a matching PPID */ |
| 327 | for (i = first; i <= last; ++i) { |
| 328 | if ((pmic_arb->periph_id_map[i] & PMIC_ARB_PPID_MASK) == ppid) |
| 329 | return i; |
| 330 | } |
| 331 | |
| 332 | dev_err(pmic_arb->dev, "Unknown ppid 0x%x\n", ppid); |
| 333 | return PMIC_ARB_MAX_PERIPHS; |
| 334 | } |
| 335 | |
| 336 | /* Enable interrupt at the PMIC Arbiter PIC */ |
| 337 | static int pmic_arb_pic_enable(struct spmi_controller *ctrl, |
| 338 | struct qpnp_irq_spec *spec, uint32_t data) |
| 339 | { |
| 340 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 341 | u8 apid = data & PMIC_ARB_APID_MASK; |
| 342 | unsigned long flags; |
| 343 | u32 status; |
| 344 | |
| 345 | dev_dbg(pmic_arb->dev, "PIC enable, apid:0x%x, sid:0x%x, pid:0x%x\n", |
| 346 | apid, spec->slave, spec->per); |
| 347 | |
| 348 | if (data < pmic_arb->min_apid || data > pmic_arb->max_apid) { |
| 349 | dev_err(pmic_arb->dev, "int enable: invalid APID %d\n", data); |
| 350 | return -EINVAL; |
| 351 | } |
| 352 | |
| 353 | if (!is_apid_valid(pmic_arb, apid)) { |
| 354 | dev_err(pmic_arb->dev, "int enable: int not supported\n"); |
| 355 | return -EINVAL; |
| 356 | } |
| 357 | |
| 358 | spin_lock_irqsave(&pmic_arb->lock, flags); |
| 359 | status = readl_relaxed(pmic_arb->intr + SPMI_PIC_ACC_ENABLE(apid)); |
| 360 | if (!status) { |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 361 | writel_relaxed(0x1, pmic_arb->intr + SPMI_PIC_ACC_ENABLE(apid)); |
| 362 | /* Interrupt needs to be enabled before returning to caller */ |
| 363 | wmb(); |
| 364 | } |
| 365 | spin_unlock_irqrestore(&pmic_arb->lock, flags); |
| 366 | return 0; |
| 367 | } |
| 368 | |
| 369 | /* Disable interrupt at the PMIC Arbiter PIC */ |
| 370 | static int pmic_arb_pic_disable(struct spmi_controller *ctrl, |
| 371 | struct qpnp_irq_spec *spec, uint32_t data) |
| 372 | { |
| 373 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 374 | u8 apid = data & PMIC_ARB_APID_MASK; |
| 375 | unsigned long flags; |
| 376 | u32 status; |
| 377 | |
| 378 | dev_dbg(pmic_arb->dev, "PIC disable, apid:0x%x, sid:0x%x, pid:0x%x\n", |
| 379 | apid, spec->slave, spec->per); |
| 380 | |
| 381 | if (data < pmic_arb->min_apid || data > pmic_arb->max_apid) { |
| 382 | dev_err(pmic_arb->dev, "int disable: invalid APID %d\n", data); |
| 383 | return -EINVAL; |
| 384 | } |
| 385 | |
| 386 | if (!is_apid_valid(pmic_arb, apid)) { |
| 387 | dev_err(pmic_arb->dev, "int disable: int not supported\n"); |
| 388 | return -EINVAL; |
| 389 | } |
| 390 | |
| 391 | spin_lock_irqsave(&pmic_arb->lock, flags); |
| 392 | status = readl_relaxed(pmic_arb->intr + SPMI_PIC_ACC_ENABLE(apid)); |
| 393 | if (status) { |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 394 | writel_relaxed(0x0, pmic_arb->intr + SPMI_PIC_ACC_ENABLE(apid)); |
| 395 | /* Interrupt needs to be disabled before returning to caller */ |
| 396 | wmb(); |
| 397 | } |
| 398 | spin_unlock_irqrestore(&pmic_arb->lock, flags); |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static irqreturn_t |
| 403 | periph_interrupt(struct spmi_pmic_arb_dev *pmic_arb, u8 apid) |
| 404 | { |
| 405 | u16 ppid = get_peripheral_id(pmic_arb, apid); |
| 406 | void __iomem *base = pmic_arb->intr; |
| 407 | u8 sid = (ppid >> 8) & 0x0F; |
| 408 | u8 pid = ppid & 0xFF; |
| 409 | u32 status; |
| 410 | int i; |
| 411 | |
| 412 | if (!is_apid_valid(pmic_arb, apid)) { |
| 413 | dev_err(pmic_arb->dev, "unknown peripheral id 0x%x\n", ppid); |
| 414 | /* return IRQ_NONE; */ |
| 415 | } |
| 416 | |
| 417 | /* Read the peripheral specific interrupt bits */ |
| 418 | status = readl_relaxed(base + SPMI_PIC_IRQ_STATUS(apid)); |
| 419 | |
| 420 | /* Clear the peripheral interrupts */ |
| 421 | writel_relaxed(status, base + SPMI_PIC_IRQ_CLEAR(apid)); |
| 422 | /* Interrupt needs to be cleared/acknowledged before exiting ISR */ |
| 423 | mb(); |
| 424 | |
| 425 | dev_dbg(pmic_arb->dev, |
| 426 | "interrupt, apid:0x%x, sid:0x%x, pid:0x%x, intr:0x%x\n", |
| 427 | apid, sid, pid, status); |
| 428 | |
| 429 | /* Send interrupt notification */ |
| 430 | for (i = 0; status && i < 8; ++i, status >>= 1) { |
| 431 | if (status & 0x1) { |
| 432 | struct qpnp_irq_spec irq_spec = { |
| 433 | .slave = sid, |
| 434 | .per = pid, |
| 435 | .irq = i, |
| 436 | }; |
| 437 | qpnpint_handle_irq(&pmic_arb->controller, &irq_spec); |
| 438 | } |
| 439 | } |
| 440 | return IRQ_HANDLED; |
| 441 | } |
| 442 | |
| 443 | /* Peripheral interrupt handler */ |
| 444 | static irqreturn_t pmic_arb_periph_irq(int irq, void *dev_id) |
| 445 | { |
| 446 | struct spmi_pmic_arb_dev *pmic_arb = dev_id; |
| 447 | void __iomem *intr = pmic_arb->intr; |
| 448 | u8 ee = pmic_arb->owner; |
| 449 | u32 ret = IRQ_NONE; |
| 450 | u32 status; |
| 451 | |
| 452 | int first = pmic_arb->min_apid >> 5; |
| 453 | int last = pmic_arb->max_apid >> 5; |
| 454 | int i, j; |
| 455 | |
| 456 | dev_dbg(pmic_arb->dev, "Peripheral interrupt detected\n"); |
| 457 | |
| 458 | /* Check the accumulated interrupt status */ |
| 459 | for (i = first; i <= last; ++i) { |
| 460 | status = readl_relaxed(intr + SPMI_PIC_OWNER_ACC_STATUS(ee, i)); |
| 461 | |
| 462 | for (j = 0; status && j < 32; ++j, status >>= 1) { |
| 463 | if (status & 0x1) { |
| 464 | u8 id = (i * 32) + j; |
| 465 | ret |= periph_interrupt(pmic_arb, id); |
| 466 | } |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | return ret; |
| 471 | } |
| 472 | |
| 473 | /* Callback to register an APID for specific slave/peripheral */ |
| 474 | static int pmic_arb_intr_priv_data(struct spmi_controller *ctrl, |
| 475 | struct qpnp_irq_spec *spec, uint32_t *data) |
| 476 | { |
| 477 | struct spmi_pmic_arb_dev *pmic_arb = spmi_get_ctrldata(ctrl); |
| 478 | u16 ppid = ((spec->slave & 0x0F) << 8) | (spec->per & 0xFF); |
| 479 | *data = map_peripheral_id(pmic_arb, ppid); |
| 480 | return 0; |
| 481 | } |
| 482 | |
| 483 | static int __devinit |
| 484 | spmi_pmic_arb_get_property(struct platform_device *pdev, char *pname, u32 *prop) |
| 485 | { |
| 486 | int ret = of_property_read_u32(pdev->dev.of_node, pname, prop); |
| 487 | |
| 488 | if (ret) |
| 489 | dev_err(&pdev->dev, "missing property: %s\n", pname); |
| 490 | else |
| 491 | pr_debug("%s = 0x%x\n", pname, *prop); |
| 492 | |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | static int __devinit spmi_pmic_arb_get_map_data(struct platform_device *pdev, |
| 497 | struct spmi_pmic_arb_dev *pmic_arb) |
| 498 | { |
| 499 | int i; |
| 500 | int ret; |
| 501 | int map_size; |
| 502 | u32 *map_data; |
Gilad Avidov | a11c0b5 | 2012-02-15 15:30:49 -0700 | [diff] [blame] | 503 | const int map_width = sizeof(*map_data); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 504 | const struct device_node *of_node = pdev->dev.of_node; |
| 505 | |
| 506 | /* Get size of the mapping table (in bytes) */ |
| 507 | if (!of_get_property(of_node, "qcom,pmic-arb-ppid-map", &map_size)) { |
| 508 | dev_err(&pdev->dev, "missing ppid mapping table\n"); |
| 509 | return -ENODEV; |
| 510 | } |
| 511 | |
| 512 | /* Map size can't exceed the maximum number of peripherals */ |
Gilad Avidov | a11c0b5 | 2012-02-15 15:30:49 -0700 | [diff] [blame] | 513 | if (map_size == 0 || map_size > map_width * PMIC_ARB_MAX_PERIPHS) { |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 514 | dev_err(&pdev->dev, "map size of %d is not valid\n", map_size); |
| 515 | return -ENODEV; |
| 516 | } |
| 517 | |
| 518 | map_data = kzalloc(map_size, GFP_KERNEL); |
| 519 | if (!map_data) { |
| 520 | dev_err(&pdev->dev, "can not allocate map data\n"); |
| 521 | return -ENOMEM; |
| 522 | } |
| 523 | |
| 524 | ret = of_property_read_u32_array(of_node, |
| 525 | "qcom,pmic-arb-ppid-map", map_data, map_size/sizeof(u32)); |
| 526 | if (ret) { |
| 527 | dev_err(&pdev->dev, "invalid or missing property: ppid-map\n"); |
| 528 | goto err; |
| 529 | }; |
| 530 | |
| 531 | pmic_arb->max_apid = 0; |
| 532 | pmic_arb->min_apid = PMIC_ARB_MAX_PERIPHS - 1; |
| 533 | |
| 534 | /* Build the mapping table from the data */ |
| 535 | for (i = 0; i < map_size/sizeof(u32);) { |
Gilad Avidov | a11c0b5 | 2012-02-15 15:30:49 -0700 | [diff] [blame] | 536 | u32 map_compressed_val = map_data[i++]; |
| 537 | u32 ppid = PMIC_ARB_DEV_TRE_2_PPID(map_compressed_val) ; |
| 538 | u32 apid = PMIC_ARB_DEV_TRE_2_APID(map_compressed_val) ; |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 539 | |
| 540 | if (pmic_arb->periph_id_map[apid] & PMIC_ARB_PERIPH_ID_VALID) |
| 541 | dev_warn(&pdev->dev, "duplicate APID 0x%x\n", apid); |
| 542 | |
| 543 | pmic_arb->periph_id_map[apid] = ppid | PMIC_ARB_PERIPH_ID_VALID; |
| 544 | |
| 545 | if (apid > pmic_arb->max_apid) |
| 546 | pmic_arb->max_apid = apid; |
| 547 | |
| 548 | if (apid < pmic_arb->min_apid) |
| 549 | pmic_arb->min_apid = apid; |
| 550 | } |
| 551 | |
| 552 | pr_debug("%d value(s) mapped, min:%d, max:%d\n", |
| 553 | map_size/map_width, pmic_arb->min_apid, pmic_arb->max_apid); |
| 554 | |
| 555 | err: |
| 556 | kfree(map_data); |
| 557 | return ret; |
| 558 | } |
| 559 | |
| 560 | static struct qpnp_local_int spmi_pmic_arb_intr_cb = { |
| 561 | .mask = pmic_arb_pic_disable, |
| 562 | .unmask = pmic_arb_pic_enable, |
| 563 | .register_priv_data = pmic_arb_intr_priv_data, |
| 564 | }; |
| 565 | |
| 566 | static int __devinit spmi_pmic_arb_probe(struct platform_device *pdev) |
| 567 | { |
| 568 | struct spmi_pmic_arb_dev *pmic_arb; |
| 569 | struct resource *mem_res; |
| 570 | u32 cell_index; |
| 571 | u32 prop; |
| 572 | int ret = 0; |
| 573 | |
| 574 | pr_debug("SPMI PMIC Arbiter\n"); |
| 575 | |
| 576 | pmic_arb = devm_kzalloc(&pdev->dev, |
| 577 | sizeof(struct spmi_pmic_arb_dev), GFP_KERNEL); |
| 578 | if (!pmic_arb) { |
| 579 | dev_err(&pdev->dev, "can not allocate pmic_arb data\n"); |
| 580 | return -ENOMEM; |
| 581 | } |
| 582 | |
| 583 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 584 | if (!mem_res) { |
| 585 | dev_err(&pdev->dev, "missing base memory resource\n"); |
| 586 | return -ENODEV; |
| 587 | } |
| 588 | |
| 589 | pmic_arb->base = devm_ioremap(&pdev->dev, |
| 590 | mem_res->start, resource_size(mem_res)); |
| 591 | if (!pmic_arb->base) { |
| 592 | dev_err(&pdev->dev, "ioremap of 'base' failed\n"); |
| 593 | return -ENOMEM; |
| 594 | } |
| 595 | |
| 596 | mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
| 597 | if (!mem_res) { |
| 598 | dev_err(&pdev->dev, "missing mem resource (interrupts)\n"); |
| 599 | return -ENODEV; |
| 600 | } |
| 601 | |
| 602 | pmic_arb->intr = devm_ioremap(&pdev->dev, |
| 603 | mem_res->start, resource_size(mem_res)); |
| 604 | if (!pmic_arb->intr) { |
| 605 | dev_err(&pdev->dev, "ioremap of 'intr' failed\n"); |
| 606 | return -ENOMEM; |
| 607 | } |
| 608 | |
| 609 | pmic_arb->pic_irq = platform_get_irq(pdev, 0); |
| 610 | if (!pmic_arb->pic_irq) { |
| 611 | dev_err(&pdev->dev, "missing IRQ resource\n"); |
| 612 | return -ENODEV; |
| 613 | } |
| 614 | |
| 615 | ret = devm_request_irq(&pdev->dev, pmic_arb->pic_irq, |
| 616 | pmic_arb_periph_irq, IRQF_TRIGGER_HIGH, pdev->name, pmic_arb); |
| 617 | if (ret) { |
| 618 | dev_err(&pdev->dev, "request IRQ failed\n"); |
| 619 | return ret; |
| 620 | } |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 621 | |
| 622 | /* Get properties from the device tree */ |
| 623 | ret = spmi_pmic_arb_get_property(pdev, "cell-index", &cell_index); |
| 624 | if (ret) |
| 625 | return -ENODEV; |
| 626 | |
| 627 | ret = spmi_pmic_arb_get_map_data(pdev, pmic_arb); |
| 628 | if (ret) |
| 629 | return ret; |
| 630 | |
| 631 | ret = spmi_pmic_arb_get_property(pdev, "qcom,pmic-arb-ee", &prop); |
| 632 | if (ret) |
| 633 | return -ENODEV; |
| 634 | pmic_arb->owner = (u8)prop; |
| 635 | |
| 636 | ret = spmi_pmic_arb_get_property(pdev, "qcom,pmic-arb-channel", &prop); |
| 637 | if (ret) |
| 638 | return -ENODEV; |
| 639 | pmic_arb->channel = (u8)prop; |
| 640 | |
| 641 | pmic_arb->dev = &pdev->dev; |
| 642 | platform_set_drvdata(pdev, pmic_arb); |
| 643 | spmi_set_ctrldata(&pmic_arb->controller, pmic_arb); |
| 644 | |
| 645 | spin_lock_init(&pmic_arb->lock); |
| 646 | |
| 647 | pmic_arb->controller.nr = cell_index; |
| 648 | pmic_arb->controller.dev.parent = pdev->dev.parent; |
| 649 | pmic_arb->controller.dev.of_node = of_node_get(pdev->dev.of_node); |
| 650 | |
| 651 | /* Callbacks */ |
| 652 | pmic_arb->controller.cmd = pmic_arb_cmd; |
| 653 | pmic_arb->controller.read_cmd = pmic_arb_read_cmd; |
| 654 | pmic_arb->controller.write_cmd = pmic_arb_write_cmd; |
| 655 | |
| 656 | ret = spmi_add_controller(&pmic_arb->controller); |
| 657 | if (ret) |
| 658 | goto err_add_controller; |
| 659 | |
| 660 | /* Register the interrupt enable/disable functions */ |
Michael Bohan | bb6b30f | 2012-06-01 13:33:51 -0700 | [diff] [blame] | 661 | ret = qpnpint_register_controller(pmic_arb->controller.dev.of_node, |
| 662 | &pmic_arb->controller, |
| 663 | &spmi_pmic_arb_intr_cb); |
| 664 | if (ret) { |
| 665 | dev_err(&pdev->dev, "Unable to register controller %d\n", |
| 666 | cell_index); |
| 667 | goto err_reg_controller; |
| 668 | } |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 669 | |
| 670 | /* Register device(s) from the device tree */ |
| 671 | of_spmi_register_devices(&pmic_arb->controller); |
| 672 | |
| 673 | pr_debug("PMIC Arb Version 0x%x\n", |
| 674 | pmic_arb_read(pmic_arb, PMIC_ARB_VERSION)); |
| 675 | |
| 676 | return 0; |
| 677 | |
Michael Bohan | bb6b30f | 2012-06-01 13:33:51 -0700 | [diff] [blame] | 678 | err_reg_controller: |
| 679 | spmi_del_controller(&pmic_arb->controller); |
Kenneth Heitke | 65a5ad2 | 2012-02-08 14:00:04 -0700 | [diff] [blame] | 680 | err_add_controller: |
| 681 | platform_set_drvdata(pdev, NULL); |
| 682 | return ret; |
| 683 | } |
| 684 | |
| 685 | static int __devexit spmi_pmic_arb_remove(struct platform_device *pdev) |
| 686 | { |
| 687 | struct spmi_pmic_arb_dev *pmic_arb = platform_get_drvdata(pdev); |
| 688 | |
| 689 | free_irq(pmic_arb->pic_irq, pmic_arb); |
| 690 | platform_set_drvdata(pdev, NULL); |
| 691 | spmi_del_controller(&pmic_arb->controller); |
| 692 | return 0; |
| 693 | } |
| 694 | |
| 695 | static struct of_device_id spmi_pmic_arb_match_table[] = { |
| 696 | { .compatible = "qcom,spmi-pmic-arb", |
| 697 | }, |
| 698 | {} |
| 699 | }; |
| 700 | |
| 701 | static struct platform_driver spmi_pmic_arb_driver = { |
| 702 | .probe = spmi_pmic_arb_probe, |
| 703 | .remove = __exit_p(spmi_pmic_arb_remove), |
| 704 | .driver = { |
| 705 | .name = SPMI_PMIC_ARB_NAME, |
| 706 | .owner = THIS_MODULE, |
| 707 | .of_match_table = spmi_pmic_arb_match_table, |
| 708 | }, |
| 709 | }; |
| 710 | |
| 711 | static int __init spmi_pmic_arb_init(void) |
| 712 | { |
| 713 | return platform_driver_register(&spmi_pmic_arb_driver); |
| 714 | } |
| 715 | postcore_initcall(spmi_pmic_arb_init); |
| 716 | |
| 717 | static void __exit spmi_pmic_arb_exit(void) |
| 718 | { |
| 719 | platform_driver_unregister(&spmi_pmic_arb_driver); |
| 720 | } |
| 721 | module_exit(spmi_pmic_arb_exit); |
| 722 | |
| 723 | MODULE_LICENSE("GPL v2"); |
| 724 | MODULE_VERSION("1.0"); |
| 725 | MODULE_ALIAS("platform:spmi_pmic_arb"); |