Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1 | /* |
| 2 | * SPI bus driver for the Topcliff PCH used by Intel SoCs |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 3 | * |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 4 | * Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 20 | #include <linux/delay.h> |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 21 | #include <linux/pci.h> |
| 22 | #include <linux/wait.h> |
| 23 | #include <linux/spi/spi.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/sched.h> |
| 26 | #include <linux/spi/spidev.h> |
| 27 | #include <linux/module.h> |
| 28 | #include <linux/device.h> |
| 29 | |
| 30 | /* Register offsets */ |
| 31 | #define PCH_SPCR 0x00 /* SPI control register */ |
| 32 | #define PCH_SPBRR 0x04 /* SPI baud rate register */ |
| 33 | #define PCH_SPSR 0x08 /* SPI status register */ |
| 34 | #define PCH_SPDWR 0x0C /* SPI write data register */ |
| 35 | #define PCH_SPDRR 0x10 /* SPI read data register */ |
| 36 | #define PCH_SSNXCR 0x18 /* SSN Expand Control Register */ |
| 37 | #define PCH_SRST 0x1C /* SPI reset register */ |
| 38 | |
| 39 | #define PCH_SPSR_TFD 0x000007C0 |
| 40 | #define PCH_SPSR_RFD 0x0000F800 |
| 41 | |
| 42 | #define PCH_READABLE(x) (((x) & PCH_SPSR_RFD)>>11) |
| 43 | #define PCH_WRITABLE(x) (((x) & PCH_SPSR_TFD)>>6) |
| 44 | |
| 45 | #define PCH_RX_THOLD 7 |
| 46 | #define PCH_RX_THOLD_MAX 15 |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 47 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 48 | #define PCH_MAX_BAUDRATE 5000000 |
| 49 | #define PCH_MAX_FIFO_DEPTH 16 |
| 50 | |
| 51 | #define STATUS_RUNNING 1 |
| 52 | #define STATUS_EXITING 2 |
| 53 | #define PCH_SLEEP_TIME 10 |
| 54 | |
| 55 | #define PCH_ADDRESS_SIZE 0x20 |
| 56 | |
| 57 | #define SSN_LOW 0x02U |
| 58 | #define SSN_NO_CONTROL 0x00U |
| 59 | #define PCH_MAX_CS 0xFF |
| 60 | #define PCI_DEVICE_ID_GE_SPI 0x8816 |
| 61 | |
| 62 | #define SPCR_SPE_BIT (1 << 0) |
| 63 | #define SPCR_MSTR_BIT (1 << 1) |
| 64 | #define SPCR_LSBF_BIT (1 << 4) |
| 65 | #define SPCR_CPHA_BIT (1 << 5) |
| 66 | #define SPCR_CPOL_BIT (1 << 6) |
| 67 | #define SPCR_TFIE_BIT (1 << 8) |
| 68 | #define SPCR_RFIE_BIT (1 << 9) |
| 69 | #define SPCR_FIE_BIT (1 << 10) |
| 70 | #define SPCR_ORIE_BIT (1 << 11) |
| 71 | #define SPCR_MDFIE_BIT (1 << 12) |
| 72 | #define SPCR_FICLR_BIT (1 << 24) |
| 73 | #define SPSR_TFI_BIT (1 << 0) |
| 74 | #define SPSR_RFI_BIT (1 << 1) |
| 75 | #define SPSR_FI_BIT (1 << 2) |
| 76 | #define SPBRR_SIZE_BIT (1 << 10) |
| 77 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 78 | #define PCH_ALL (SPCR_TFIE_BIT|SPCR_RFIE_BIT|SPCR_FIE_BIT|SPCR_ORIE_BIT|SPCR_MDFIE_BIT) |
| 79 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 80 | #define SPCR_RFIC_FIELD 20 |
| 81 | #define SPCR_TFIC_FIELD 16 |
| 82 | |
| 83 | #define SPSR_INT_BITS 0x1F |
| 84 | #define MASK_SPBRR_SPBR_BITS (~((1 << 10) - 1)) |
| 85 | #define MASK_RFIC_SPCR_BITS (~(0xf << 20)) |
| 86 | #define MASK_TFIC_SPCR_BITS (~(0xf000f << 12)) |
| 87 | |
| 88 | #define PCH_CLOCK_HZ 50000000 |
| 89 | #define PCH_MAX_SPBR 1023 |
| 90 | |
| 91 | |
| 92 | /** |
| 93 | * struct pch_spi_data - Holds the SPI channel specific details |
| 94 | * @io_remap_addr: The remapped PCI base address |
| 95 | * @master: Pointer to the SPI master structure |
| 96 | * @work: Reference to work queue handler |
| 97 | * @wk: Workqueue for carrying out execution of the |
| 98 | * requests |
| 99 | * @wait: Wait queue for waking up upon receiving an |
| 100 | * interrupt. |
| 101 | * @transfer_complete: Status of SPI Transfer |
| 102 | * @bcurrent_msg_processing: Status flag for message processing |
| 103 | * @lock: Lock for protecting this structure |
| 104 | * @queue: SPI Message queue |
| 105 | * @status: Status of the SPI driver |
| 106 | * @bpw_len: Length of data to be transferred in bits per |
| 107 | * word |
| 108 | * @transfer_active: Flag showing active transfer |
| 109 | * @tx_index: Transmit data count; for bookkeeping during |
| 110 | * transfer |
| 111 | * @rx_index: Receive data count; for bookkeeping during |
| 112 | * transfer |
| 113 | * @tx_buff: Buffer for data to be transmitted |
| 114 | * @rx_index: Buffer for Received data |
| 115 | * @n_curnt_chip: The chip number that this SPI driver currently |
| 116 | * operates on |
| 117 | * @current_chip: Reference to the current chip that this SPI |
| 118 | * driver currently operates on |
| 119 | * @current_msg: The current message that this SPI driver is |
| 120 | * handling |
| 121 | * @cur_trans: The current transfer that this SPI driver is |
| 122 | * handling |
| 123 | * @board_dat: Reference to the SPI device data structure |
| 124 | */ |
| 125 | struct pch_spi_data { |
| 126 | void __iomem *io_remap_addr; |
| 127 | struct spi_master *master; |
| 128 | struct work_struct work; |
| 129 | struct workqueue_struct *wk; |
| 130 | wait_queue_head_t wait; |
| 131 | u8 transfer_complete; |
| 132 | u8 bcurrent_msg_processing; |
| 133 | spinlock_t lock; |
| 134 | struct list_head queue; |
| 135 | u8 status; |
| 136 | u32 bpw_len; |
| 137 | u8 transfer_active; |
| 138 | u32 tx_index; |
| 139 | u32 rx_index; |
| 140 | u16 *pkt_tx_buff; |
| 141 | u16 *pkt_rx_buff; |
| 142 | u8 n_curnt_chip; |
| 143 | struct spi_device *current_chip; |
| 144 | struct spi_message *current_msg; |
| 145 | struct spi_transfer *cur_trans; |
| 146 | struct pch_spi_board_data *board_dat; |
| 147 | }; |
| 148 | |
| 149 | /** |
| 150 | * struct pch_spi_board_data - Holds the SPI device specific details |
| 151 | * @pdev: Pointer to the PCI device |
| 152 | * @irq_reg_sts: Status of IRQ registration |
| 153 | * @pci_req_sts: Status of pci_request_regions |
| 154 | * @suspend_sts: Status of suspend |
| 155 | * @data: Pointer to SPI channel data structure |
| 156 | */ |
| 157 | struct pch_spi_board_data { |
| 158 | struct pci_dev *pdev; |
| 159 | u8 irq_reg_sts; |
| 160 | u8 pci_req_sts; |
| 161 | u8 suspend_sts; |
| 162 | struct pch_spi_data *data; |
| 163 | }; |
| 164 | |
| 165 | static struct pci_device_id pch_spi_pcidev_id[] = { |
| 166 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_GE_SPI)}, |
| 167 | {0,} |
| 168 | }; |
| 169 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 170 | /** |
| 171 | * pch_spi_writereg() - Performs register writes |
| 172 | * @master: Pointer to struct spi_master. |
| 173 | * @idx: Register offset. |
| 174 | * @val: Value to be written to register. |
| 175 | */ |
| 176 | static inline void pch_spi_writereg(struct spi_master *master, int idx, u32 val) |
| 177 | { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 178 | struct pch_spi_data *data = spi_master_get_devdata(master); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 179 | iowrite32(val, (data->io_remap_addr + idx)); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * pch_spi_readreg() - Performs register reads |
| 184 | * @master: Pointer to struct spi_master. |
| 185 | * @idx: Register offset. |
| 186 | */ |
| 187 | static inline u32 pch_spi_readreg(struct spi_master *master, int idx) |
| 188 | { |
| 189 | struct pch_spi_data *data = spi_master_get_devdata(master); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 190 | return ioread32(data->io_remap_addr + idx); |
| 191 | } |
| 192 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 193 | static inline void pch_spi_setclr_reg(struct spi_master *master, int idx, |
| 194 | u32 set, u32 clr) |
| 195 | { |
| 196 | u32 tmp = pch_spi_readreg(master, idx); |
| 197 | tmp = (tmp & ~clr) | set; |
| 198 | pch_spi_writereg(master, idx, tmp); |
| 199 | } |
| 200 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 201 | static void pch_spi_set_master_mode(struct spi_master *master) |
| 202 | { |
| 203 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_MSTR_BIT, 0); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * pch_spi_clear_fifo() - Clears the Transmit and Receive FIFOs |
| 208 | * @master: Pointer to struct spi_master. |
| 209 | */ |
| 210 | static void pch_spi_clear_fifo(struct spi_master *master) |
| 211 | { |
| 212 | pch_spi_setclr_reg(master, PCH_SPCR, SPCR_FICLR_BIT, 0); |
| 213 | pch_spi_setclr_reg(master, PCH_SPCR, 0, SPCR_FICLR_BIT); |
| 214 | } |
| 215 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 216 | static void pch_spi_handler_sub(struct pch_spi_data *data, u32 reg_spsr_val, |
| 217 | void __iomem *io_remap_addr) |
| 218 | { |
| 219 | u32 n_read, tx_index, rx_index, bpw_len; |
| 220 | u16 *pkt_rx_buffer, *pkt_tx_buff; |
| 221 | int read_cnt; |
| 222 | u32 reg_spcr_val; |
| 223 | void __iomem *spsr; |
| 224 | void __iomem *spdrr; |
| 225 | void __iomem *spdwr; |
| 226 | |
| 227 | spsr = io_remap_addr + PCH_SPSR; |
| 228 | iowrite32(reg_spsr_val, spsr); |
| 229 | |
| 230 | if (data->transfer_active) { |
| 231 | rx_index = data->rx_index; |
| 232 | tx_index = data->tx_index; |
| 233 | bpw_len = data->bpw_len; |
| 234 | pkt_rx_buffer = data->pkt_rx_buff; |
| 235 | pkt_tx_buff = data->pkt_tx_buff; |
| 236 | |
| 237 | spdrr = io_remap_addr + PCH_SPDRR; |
| 238 | spdwr = io_remap_addr + PCH_SPDWR; |
| 239 | |
| 240 | n_read = PCH_READABLE(reg_spsr_val); |
| 241 | |
| 242 | for (read_cnt = 0; (read_cnt < n_read); read_cnt++) { |
| 243 | pkt_rx_buffer[rx_index++] = ioread32(spdrr); |
| 244 | if (tx_index < bpw_len) |
| 245 | iowrite32(pkt_tx_buff[tx_index++], spdwr); |
| 246 | } |
| 247 | |
| 248 | /* disable RFI if not needed */ |
| 249 | if ((bpw_len - rx_index) <= PCH_MAX_FIFO_DEPTH) { |
| 250 | reg_spcr_val = ioread32(io_remap_addr + PCH_SPCR); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 251 | reg_spcr_val &= ~SPCR_RFIE_BIT; /* disable RFI */ |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 252 | |
| 253 | /* reset rx threshold */ |
| 254 | reg_spcr_val &= MASK_RFIC_SPCR_BITS; |
| 255 | reg_spcr_val |= (PCH_RX_THOLD_MAX << SPCR_RFIC_FIELD); |
| 256 | iowrite32(((reg_spcr_val) &= (~(SPCR_RFIE_BIT))), |
| 257 | (io_remap_addr + PCH_SPCR)); |
| 258 | } |
| 259 | |
| 260 | /* update counts */ |
| 261 | data->tx_index = tx_index; |
| 262 | data->rx_index = rx_index; |
| 263 | |
| 264 | } |
| 265 | |
| 266 | /* if transfer complete interrupt */ |
| 267 | if (reg_spsr_val & SPSR_FI_BIT) { |
| 268 | /* disable FI & RFI interrupts */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 269 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, |
Tomoya MORINAGA | 9d32af6 | 2010-12-24 11:40:50 +0900 | [diff] [blame^] | 270 | SPCR_FIE_BIT | SPCR_RFIE_BIT); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 271 | |
| 272 | /* transfer is completed;inform pch_spi_process_messages */ |
| 273 | data->transfer_complete = true; |
| 274 | wake_up(&data->wait); |
| 275 | } |
| 276 | } |
| 277 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 278 | /** |
| 279 | * pch_spi_handler() - Interrupt handler |
| 280 | * @irq: The interrupt number. |
| 281 | * @dev_id: Pointer to struct pch_spi_board_data. |
| 282 | */ |
| 283 | static irqreturn_t pch_spi_handler(int irq, void *dev_id) |
| 284 | { |
| 285 | u32 reg_spsr_val; |
| 286 | struct pch_spi_data *data; |
| 287 | void __iomem *spsr; |
| 288 | void __iomem *io_remap_addr; |
| 289 | irqreturn_t ret = IRQ_NONE; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 290 | struct pch_spi_board_data *board_dat = dev_id; |
| 291 | |
| 292 | if (board_dat->suspend_sts) { |
| 293 | dev_dbg(&board_dat->pdev->dev, |
| 294 | "%s returning due to suspend\n", __func__); |
| 295 | return IRQ_NONE; |
| 296 | } |
| 297 | |
| 298 | data = board_dat->data; |
| 299 | io_remap_addr = data->io_remap_addr; |
| 300 | spsr = io_remap_addr + PCH_SPSR; |
| 301 | |
| 302 | reg_spsr_val = ioread32(spsr); |
| 303 | |
| 304 | /* Check if the interrupt is for SPI device */ |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 305 | if (reg_spsr_val & (SPSR_FI_BIT | SPSR_RFI_BIT)) { |
| 306 | pch_spi_handler_sub(data, reg_spsr_val, io_remap_addr); |
| 307 | ret = IRQ_HANDLED; |
| 308 | } |
| 309 | |
| 310 | dev_dbg(&board_dat->pdev->dev, "%s EXIT return value=%d\n", |
| 311 | __func__, ret); |
| 312 | |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * pch_spi_set_baud_rate() - Sets SPBR field in SPBRR |
| 318 | * @master: Pointer to struct spi_master. |
| 319 | * @speed_hz: Baud rate. |
| 320 | */ |
| 321 | static void pch_spi_set_baud_rate(struct spi_master *master, u32 speed_hz) |
| 322 | { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 323 | u32 n_spbr = PCH_CLOCK_HZ / (speed_hz * 2); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 324 | |
| 325 | /* if baud rate is less than we can support limit it */ |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 326 | if (n_spbr > PCH_MAX_SPBR) |
| 327 | n_spbr = PCH_MAX_SPBR; |
| 328 | |
| 329 | pch_spi_setclr_reg(master, PCH_SPBRR, n_spbr, ~MASK_SPBRR_SPBR_BITS); |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * pch_spi_set_bits_per_word() - Sets SIZE field in SPBRR |
| 334 | * @master: Pointer to struct spi_master. |
| 335 | * @bits_per_word: Bits per word for SPI transfer. |
| 336 | */ |
| 337 | static void pch_spi_set_bits_per_word(struct spi_master *master, |
| 338 | u8 bits_per_word) |
| 339 | { |
| 340 | if (bits_per_word == 8) |
| 341 | pch_spi_setclr_reg(master, PCH_SPBRR, 0, SPBRR_SIZE_BIT); |
| 342 | else |
| 343 | pch_spi_setclr_reg(master, PCH_SPBRR, SPBRR_SIZE_BIT, 0); |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * pch_spi_setup_transfer() - Configures the PCH SPI hardware for transfer |
| 348 | * @spi: Pointer to struct spi_device. |
| 349 | */ |
| 350 | static void pch_spi_setup_transfer(struct spi_device *spi) |
| 351 | { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 352 | u32 flags = 0; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 353 | |
| 354 | dev_dbg(&spi->dev, "%s SPBRR content =%x setting baud rate=%d\n", |
| 355 | __func__, pch_spi_readreg(spi->master, PCH_SPBRR), |
| 356 | spi->max_speed_hz); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 357 | pch_spi_set_baud_rate(spi->master, spi->max_speed_hz); |
| 358 | |
| 359 | /* set bits per word */ |
| 360 | pch_spi_set_bits_per_word(spi->master, spi->bits_per_word); |
| 361 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 362 | if (!(spi->mode & SPI_LSB_FIRST)) |
| 363 | flags |= SPCR_LSBF_BIT; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 364 | if (spi->mode & SPI_CPOL) |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 365 | flags |= SPCR_CPOL_BIT; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 366 | if (spi->mode & SPI_CPHA) |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 367 | flags |= SPCR_CPHA_BIT; |
| 368 | pch_spi_setclr_reg(spi->master, PCH_SPCR, flags, |
| 369 | (SPCR_LSBF_BIT | SPCR_CPOL_BIT | SPCR_CPHA_BIT)); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 370 | |
| 371 | /* Clear the FIFO by toggling FICLR to 1 and back to 0 */ |
| 372 | pch_spi_clear_fifo(spi->master); |
| 373 | } |
| 374 | |
| 375 | /** |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 376 | * pch_spi_reset() - Clears SPI registers |
| 377 | * @master: Pointer to struct spi_master. |
| 378 | */ |
| 379 | static void pch_spi_reset(struct spi_master *master) |
| 380 | { |
| 381 | /* write 1 to reset SPI */ |
| 382 | pch_spi_writereg(master, PCH_SRST, 0x1); |
| 383 | |
| 384 | /* clear reset */ |
| 385 | pch_spi_writereg(master, PCH_SRST, 0x0); |
| 386 | } |
| 387 | |
| 388 | static int pch_spi_setup(struct spi_device *pspi) |
| 389 | { |
| 390 | /* check bits per word */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 391 | if (pspi->bits_per_word == 0) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 392 | pspi->bits_per_word = 8; |
| 393 | dev_dbg(&pspi->dev, "%s 8 bits per word\n", __func__); |
| 394 | } |
| 395 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 396 | if ((pspi->bits_per_word != 8) && (pspi->bits_per_word != 16)) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 397 | dev_err(&pspi->dev, "%s Invalid bits per word\n", __func__); |
| 398 | return -EINVAL; |
| 399 | } |
| 400 | |
| 401 | /* Check baud rate setting */ |
| 402 | /* if baud rate of chip is greater than |
| 403 | max we can support,return error */ |
| 404 | if ((pspi->max_speed_hz) > PCH_MAX_BAUDRATE) |
| 405 | pspi->max_speed_hz = PCH_MAX_BAUDRATE; |
| 406 | |
| 407 | dev_dbg(&pspi->dev, "%s MODE = %x\n", __func__, |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 408 | (pspi->mode) & (SPI_CPOL | SPI_CPHA)); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 409 | |
| 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | static int pch_spi_transfer(struct spi_device *pspi, struct spi_message *pmsg) |
| 414 | { |
| 415 | |
| 416 | struct spi_transfer *transfer; |
| 417 | struct pch_spi_data *data = spi_master_get_devdata(pspi->master); |
| 418 | int retval; |
| 419 | unsigned long flags; |
| 420 | |
| 421 | /* validate spi message and baud rate */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 422 | if (unlikely(list_empty(&pmsg->transfers) == 1)) { |
| 423 | dev_err(&pspi->dev, "%s list empty\n", __func__); |
| 424 | retval = -EINVAL; |
| 425 | goto err_out; |
| 426 | } |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 427 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 428 | if (unlikely(pspi->max_speed_hz == 0)) { |
| 429 | dev_err(&pspi->dev, "%s pch_spi_tranfer maxspeed=%d\n", |
| 430 | __func__, pspi->max_speed_hz); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 431 | retval = -EINVAL; |
| 432 | goto err_out; |
| 433 | } |
| 434 | |
| 435 | dev_dbg(&pspi->dev, "%s Transfer List not empty. " |
| 436 | "Transfer Speed is set.\n", __func__); |
| 437 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 438 | /* validate Tx/Rx buffers and Transfer length */ |
| 439 | list_for_each_entry(transfer, &pmsg->transfers, transfer_list) { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 440 | if (!transfer->tx_buf && !transfer->rx_buf) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 441 | dev_err(&pspi->dev, |
| 442 | "%s Tx and Rx buffer NULL\n", __func__); |
| 443 | retval = -EINVAL; |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 444 | goto err_out; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 445 | } |
| 446 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 447 | if (!transfer->len) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 448 | dev_err(&pspi->dev, "%s Transfer length invalid\n", |
| 449 | __func__); |
| 450 | retval = -EINVAL; |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 451 | goto err_out; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | dev_dbg(&pspi->dev, "%s Tx/Rx buffer valid. Transfer length" |
| 455 | " valid\n", __func__); |
| 456 | |
| 457 | /* if baud rate hs been specified validate the same */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 458 | if (transfer->speed_hz > PCH_MAX_BAUDRATE) |
| 459 | transfer->speed_hz = PCH_MAX_BAUDRATE; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 460 | |
| 461 | /* if bits per word has been specified validate the same */ |
| 462 | if (transfer->bits_per_word) { |
| 463 | if ((transfer->bits_per_word != 8) |
| 464 | && (transfer->bits_per_word != 16)) { |
| 465 | retval = -EINVAL; |
| 466 | dev_err(&pspi->dev, |
| 467 | "%s Invalid bits per word\n", __func__); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 468 | goto err_out; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 469 | } |
| 470 | } |
| 471 | } |
| 472 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 473 | spin_lock_irqsave(&data->lock, flags); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 474 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 475 | /* We won't process any messages if we have been asked to terminate */ |
| 476 | if (data->status == STATUS_EXITING) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 477 | dev_err(&pspi->dev, "%s status = STATUS_EXITING.\n", __func__); |
| 478 | retval = -ESHUTDOWN; |
| 479 | goto err_return_spinlock; |
| 480 | } |
| 481 | |
| 482 | /* If suspended ,return -EINVAL */ |
| 483 | if (data->board_dat->suspend_sts) { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 484 | dev_err(&pspi->dev, "%s suspend; returning EINVAL\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 485 | retval = -EINVAL; |
| 486 | goto err_return_spinlock; |
| 487 | } |
| 488 | |
| 489 | /* set status of message */ |
| 490 | pmsg->actual_length = 0; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 491 | dev_dbg(&pspi->dev, "%s - pmsg->status =%d\n", __func__, pmsg->status); |
| 492 | |
| 493 | pmsg->status = -EINPROGRESS; |
| 494 | |
| 495 | /* add message to queue */ |
| 496 | list_add_tail(&pmsg->queue, &data->queue); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 497 | dev_dbg(&pspi->dev, "%s - Invoked list_add_tail\n", __func__); |
| 498 | |
| 499 | /* schedule work queue to run */ |
| 500 | queue_work(data->wk, &data->work); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 501 | dev_dbg(&pspi->dev, "%s - Invoked queue work\n", __func__); |
| 502 | |
| 503 | retval = 0; |
| 504 | |
| 505 | err_return_spinlock: |
| 506 | spin_unlock_irqrestore(&data->lock, flags); |
| 507 | err_out: |
| 508 | dev_dbg(&pspi->dev, "%s RETURN=%d\n", __func__, retval); |
| 509 | return retval; |
| 510 | } |
| 511 | |
| 512 | static inline void pch_spi_select_chip(struct pch_spi_data *data, |
| 513 | struct spi_device *pspi) |
| 514 | { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 515 | if (data->current_chip != NULL) { |
| 516 | if (pspi->chip_select != data->n_curnt_chip) { |
| 517 | dev_dbg(&pspi->dev, "%s : different slave\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 518 | data->current_chip = NULL; |
| 519 | } |
| 520 | } |
| 521 | |
| 522 | data->current_chip = pspi; |
| 523 | |
| 524 | data->n_curnt_chip = data->current_chip->chip_select; |
| 525 | |
| 526 | dev_dbg(&pspi->dev, "%s :Invoking pch_spi_setup_transfer\n", __func__); |
| 527 | pch_spi_setup_transfer(pspi); |
| 528 | } |
| 529 | |
| 530 | static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw, |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 531 | struct spi_message **ppmsg) |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 532 | { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 533 | int size; |
| 534 | u32 n_writes; |
| 535 | int j; |
| 536 | struct spi_message *pmsg; |
| 537 | const u8 *tx_buf; |
| 538 | const u16 *tx_sbuf; |
| 539 | |
| 540 | pmsg = *ppmsg; |
| 541 | |
| 542 | /* set baud rate if needed */ |
| 543 | if (data->cur_trans->speed_hz) { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 544 | dev_dbg(&data->master->dev, "%s:setting baud rate\n", __func__); |
| 545 | pch_spi_set_baud_rate(data->master, data->cur_trans->speed_hz); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | /* set bits per word if needed */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 549 | if (data->cur_trans->bits_per_word && |
| 550 | (data->current_msg->spi->bits_per_word != data->cur_trans->bits_per_word)) { |
| 551 | dev_dbg(&data->master->dev, "%s:set bits per word\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 552 | pch_spi_set_bits_per_word(data->master, |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 553 | data->cur_trans->bits_per_word); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 554 | *bpw = data->cur_trans->bits_per_word; |
| 555 | } else { |
| 556 | *bpw = data->current_msg->spi->bits_per_word; |
| 557 | } |
| 558 | |
| 559 | /* reset Tx/Rx index */ |
| 560 | data->tx_index = 0; |
| 561 | data->rx_index = 0; |
| 562 | |
| 563 | data->bpw_len = data->cur_trans->len / (*bpw / 8); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 564 | |
| 565 | /* find alloc size */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 566 | size = data->cur_trans->len * sizeof(*data->pkt_tx_buff); |
| 567 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 568 | /* allocate memory for pkt_tx_buff & pkt_rx_buffer */ |
| 569 | data->pkt_tx_buff = kzalloc(size, GFP_KERNEL); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 570 | if (data->pkt_tx_buff != NULL) { |
| 571 | data->pkt_rx_buff = kzalloc(size, GFP_KERNEL); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 572 | if (!data->pkt_rx_buff) |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 573 | kfree(data->pkt_tx_buff); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 574 | } |
| 575 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 576 | if (!data->pkt_rx_buff) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 577 | /* flush queue and set status of all transfers to -ENOMEM */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 578 | dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 579 | list_for_each_entry(pmsg, data->queue.next, queue) { |
| 580 | pmsg->status = -ENOMEM; |
| 581 | |
| 582 | if (pmsg->complete != 0) |
| 583 | pmsg->complete(pmsg->context); |
| 584 | |
| 585 | /* delete from queue */ |
| 586 | list_del_init(&pmsg->queue); |
| 587 | } |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 588 | return; |
| 589 | } |
| 590 | |
| 591 | /* copy Tx Data */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 592 | if (data->cur_trans->tx_buf != NULL) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 593 | if (*bpw == 8) { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 594 | tx_buf = data->cur_trans->tx_buf; |
| 595 | for (j = 0; j < data->bpw_len; j++) |
| 596 | data->pkt_tx_buff[j] = *tx_buf++; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 597 | } else { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 598 | tx_sbuf = data->cur_trans->tx_buf; |
| 599 | for (j = 0; j < data->bpw_len; j++) |
| 600 | data->pkt_tx_buff[j] = *tx_sbuf++; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 601 | } |
| 602 | } |
| 603 | |
| 604 | /* if len greater than PCH_MAX_FIFO_DEPTH, write 16,else len bytes */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 605 | n_writes = data->bpw_len; |
| 606 | if (n_writes > PCH_MAX_FIFO_DEPTH) |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 607 | n_writes = PCH_MAX_FIFO_DEPTH; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 608 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 609 | dev_dbg(&data->master->dev, "\n%s:Pulling down SSN low - writing " |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 610 | "0x2 to SSNXCR\n", __func__); |
| 611 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_LOW); |
| 612 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 613 | for (j = 0; j < n_writes; j++) |
| 614 | pch_spi_writereg(data->master, PCH_SPDWR, data->pkt_tx_buff[j]); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 615 | |
| 616 | /* update tx_index */ |
| 617 | data->tx_index = j; |
| 618 | |
| 619 | /* reset transfer complete flag */ |
| 620 | data->transfer_complete = false; |
| 621 | data->transfer_active = true; |
| 622 | } |
| 623 | |
| 624 | |
| 625 | static void pch_spi_nomore_transfer(struct pch_spi_data *data, |
| 626 | struct spi_message *pmsg) |
| 627 | { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 628 | dev_dbg(&data->master->dev, "%s called\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 629 | /* Invoke complete callback |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 630 | * [To the spi core..indicating end of transfer] */ |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 631 | data->current_msg->status = 0; |
| 632 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 633 | if (data->current_msg->complete != 0) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 634 | dev_dbg(&data->master->dev, |
| 635 | "%s:Invoking callback of SPI core\n", __func__); |
| 636 | data->current_msg->complete(data->current_msg->context); |
| 637 | } |
| 638 | |
| 639 | /* update status in global variable */ |
| 640 | data->bcurrent_msg_processing = false; |
| 641 | |
| 642 | dev_dbg(&data->master->dev, |
| 643 | "%s:data->bcurrent_msg_processing = false\n", __func__); |
| 644 | |
| 645 | data->current_msg = NULL; |
| 646 | data->cur_trans = NULL; |
| 647 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 648 | /* check if we have items in list and not suspending |
| 649 | * return 1 if list empty */ |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 650 | if ((list_empty(&data->queue) == 0) && |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 651 | (!data->board_dat->suspend_sts) && |
| 652 | (data->status != STATUS_EXITING)) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 653 | /* We have some more work to do (either there is more tranint |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 654 | * bpw;sfer requests in the current message or there are |
| 655 | *more messages) |
| 656 | */ |
| 657 | dev_dbg(&data->master->dev, "%s:Invoke queue_work\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 658 | queue_work(data->wk, &data->work); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 659 | } else if (data->board_dat->suspend_sts || |
| 660 | data->status == STATUS_EXITING) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 661 | dev_dbg(&data->master->dev, |
| 662 | "%s suspend/remove initiated, flushing queue\n", |
| 663 | __func__); |
| 664 | list_for_each_entry(pmsg, data->queue.next, queue) { |
| 665 | pmsg->status = -EIO; |
| 666 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 667 | if (pmsg->complete) |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 668 | pmsg->complete(pmsg->context); |
| 669 | |
| 670 | /* delete from queue */ |
| 671 | list_del_init(&pmsg->queue); |
| 672 | } |
| 673 | } |
| 674 | } |
| 675 | |
| 676 | static void pch_spi_set_ir(struct pch_spi_data *data) |
| 677 | { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 678 | /* enable interrupts */ |
| 679 | if ((data->bpw_len) > PCH_MAX_FIFO_DEPTH) { |
| 680 | /* set receive threhold to PCH_RX_THOLD */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 681 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
Tomoya MORINAGA | 9d32af6 | 2010-12-24 11:40:50 +0900 | [diff] [blame^] | 682 | PCH_RX_THOLD << SPCR_RFIC_FIELD, |
| 683 | ~MASK_RFIC_SPCR_BITS); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 684 | /* enable FI and RFI interrupts */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 685 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
Tomoya MORINAGA | 9d32af6 | 2010-12-24 11:40:50 +0900 | [diff] [blame^] | 686 | SPCR_RFIE_BIT | SPCR_FIE_BIT, 0); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 687 | } else { |
| 688 | /* set receive threhold to maximum */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 689 | pch_spi_setclr_reg(data->master, PCH_SPCR, |
| 690 | PCH_RX_THOLD_MAX << SPCR_TFIC_FIELD, |
| 691 | ~MASK_TFIC_SPCR_BITS); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 692 | /* enable FI interrupt */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 693 | pch_spi_setclr_reg(data->master, PCH_SPCR, SPCR_FIE_BIT, 0); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 694 | } |
| 695 | |
| 696 | dev_dbg(&data->master->dev, |
| 697 | "%s:invoking pch_spi_set_enable to enable SPI\n", __func__); |
| 698 | |
| 699 | /* SPI set enable */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 700 | pch_spi_setclr_reg(data->current_chip->master, PCH_SPCR, SPCR_SPE_BIT, 0); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 701 | |
| 702 | /* Wait until the transfer completes; go to sleep after |
| 703 | initiating the transfer. */ |
| 704 | dev_dbg(&data->master->dev, |
| 705 | "%s:waiting for transfer to get over\n", __func__); |
| 706 | |
| 707 | wait_event_interruptible(data->wait, data->transfer_complete); |
| 708 | |
| 709 | pch_spi_writereg(data->master, PCH_SSNXCR, SSN_NO_CONTROL); |
| 710 | dev_dbg(&data->master->dev, |
| 711 | "%s:no more control over SSN-writing 0 to SSNXCR.", __func__); |
| 712 | |
| 713 | data->transfer_active = false; |
| 714 | dev_dbg(&data->master->dev, |
| 715 | "%s set data->transfer_active = false\n", __func__); |
| 716 | |
| 717 | /* clear all interrupts */ |
| 718 | pch_spi_writereg(data->master, PCH_SPSR, |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 719 | pch_spi_readreg(data->master, PCH_SPSR)); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 720 | /* disable interrupts */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 721 | pch_spi_setclr_reg(data->master, PCH_SPCR, 0, PCH_ALL); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 722 | } |
| 723 | |
| 724 | static void pch_spi_copy_rx_data(struct pch_spi_data *data, int bpw) |
| 725 | { |
| 726 | int j; |
| 727 | u8 *rx_buf; |
| 728 | u16 *rx_sbuf; |
| 729 | |
| 730 | /* copy Rx Data */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 731 | if (!data->cur_trans->rx_buf) |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 732 | return; |
| 733 | |
| 734 | if (bpw == 8) { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 735 | rx_buf = data->cur_trans->rx_buf; |
| 736 | for (j = 0; j < data->bpw_len; j++) |
| 737 | *rx_buf++ = data->pkt_rx_buff[j] & 0xFF; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 738 | } else { |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 739 | rx_sbuf = data->cur_trans->rx_buf; |
| 740 | for (j = 0; j < data->bpw_len; j++) |
| 741 | *rx_sbuf++ = data->pkt_rx_buff[j]; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 742 | } |
| 743 | } |
| 744 | |
| 745 | |
| 746 | static void pch_spi_process_messages(struct work_struct *pwork) |
| 747 | { |
| 748 | struct spi_message *pmsg; |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 749 | struct pch_spi_data *data; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 750 | int bpw; |
| 751 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 752 | data = container_of(pwork, struct pch_spi_data, work); |
Grant Likely | 8e41b52 | 2010-10-13 23:03:15 -0600 | [diff] [blame] | 753 | dev_dbg(&data->master->dev, "%s data initialized\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 754 | |
| 755 | spin_lock(&data->lock); |
| 756 | |
| 757 | /* check if suspend has been initiated;if yes flush queue */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 758 | if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 759 | dev_dbg(&data->master->dev, |
| 760 | "%s suspend/remove initiated,flushing queue\n", |
| 761 | __func__); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 762 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 763 | list_for_each_entry(pmsg, data->queue.next, queue) { |
| 764 | pmsg->status = -EIO; |
| 765 | |
| 766 | if (pmsg->complete != 0) { |
| 767 | spin_unlock(&data->lock); |
| 768 | pmsg->complete(pmsg->context); |
| 769 | spin_lock(&data->lock); |
| 770 | } |
| 771 | |
| 772 | /* delete from queue */ |
| 773 | list_del_init(&pmsg->queue); |
| 774 | } |
| 775 | |
| 776 | spin_unlock(&data->lock); |
| 777 | return; |
| 778 | } |
| 779 | |
| 780 | data->bcurrent_msg_processing = true; |
| 781 | dev_dbg(&data->master->dev, |
| 782 | "%s Set data->bcurrent_msg_processing= true\n", __func__); |
| 783 | |
| 784 | /* Get the message from the queue and delete it from there. */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 785 | data->current_msg = list_entry(data->queue.next, struct spi_message, |
| 786 | queue); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 787 | |
| 788 | list_del_init(&data->current_msg->queue); |
| 789 | |
| 790 | data->current_msg->status = 0; |
| 791 | |
| 792 | pch_spi_select_chip(data, data->current_msg->spi); |
| 793 | |
| 794 | spin_unlock(&data->lock); |
| 795 | |
| 796 | do { |
| 797 | /* If we are already processing a message get the next |
| 798 | transfer structure from the message otherwise retrieve |
| 799 | the 1st transfer request from the message. */ |
| 800 | spin_lock(&data->lock); |
| 801 | |
| 802 | if (data->cur_trans == NULL) { |
| 803 | data->cur_trans = |
| 804 | list_entry(data->current_msg->transfers. |
| 805 | next, struct spi_transfer, |
| 806 | transfer_list); |
| 807 | dev_dbg(&data->master->dev, |
| 808 | "%s :Getting 1st transfer message\n", __func__); |
| 809 | } else { |
| 810 | data->cur_trans = |
| 811 | list_entry(data->cur_trans->transfer_list.next, |
| 812 | struct spi_transfer, |
| 813 | transfer_list); |
| 814 | dev_dbg(&data->master->dev, |
| 815 | "%s :Getting next transfer message\n", |
| 816 | __func__); |
| 817 | } |
| 818 | |
| 819 | spin_unlock(&data->lock); |
| 820 | |
| 821 | pch_spi_set_tx(data, &bpw, &pmsg); |
| 822 | |
| 823 | /* Control interrupt*/ |
| 824 | pch_spi_set_ir(data); |
| 825 | |
| 826 | /* Disable SPI transfer */ |
| 827 | pch_spi_setclr_reg(data->current_chip->master, PCH_SPCR, 0, |
| 828 | SPCR_SPE_BIT); |
| 829 | |
| 830 | /* clear FIFO */ |
| 831 | pch_spi_clear_fifo(data->master); |
| 832 | |
| 833 | /* copy Rx Data */ |
| 834 | pch_spi_copy_rx_data(data, bpw); |
| 835 | |
| 836 | /* free memory */ |
| 837 | kfree(data->pkt_rx_buff); |
| 838 | data->pkt_rx_buff = NULL; |
| 839 | |
| 840 | kfree(data->pkt_tx_buff); |
| 841 | data->pkt_tx_buff = NULL; |
| 842 | |
| 843 | /* increment message count */ |
| 844 | data->current_msg->actual_length += data->cur_trans->len; |
| 845 | |
| 846 | dev_dbg(&data->master->dev, |
| 847 | "%s:data->current_msg->actual_length=%d\n", |
| 848 | __func__, data->current_msg->actual_length); |
| 849 | |
| 850 | /* check for delay */ |
| 851 | if (data->cur_trans->delay_usecs) { |
| 852 | dev_dbg(&data->master->dev, "%s:" |
| 853 | "delay in usec=%d\n", __func__, |
| 854 | data->cur_trans->delay_usecs); |
| 855 | udelay(data->cur_trans->delay_usecs); |
| 856 | } |
| 857 | |
| 858 | spin_lock(&data->lock); |
| 859 | |
| 860 | /* No more transfer in this message. */ |
| 861 | if ((data->cur_trans->transfer_list.next) == |
| 862 | &(data->current_msg->transfers)) { |
| 863 | pch_spi_nomore_transfer(data, pmsg); |
| 864 | } |
| 865 | |
| 866 | spin_unlock(&data->lock); |
| 867 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 868 | } while (data->cur_trans != NULL); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | static void pch_spi_free_resources(struct pch_spi_board_data *board_dat) |
| 872 | { |
| 873 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); |
| 874 | |
| 875 | /* free workqueue */ |
| 876 | if (board_dat->data->wk != NULL) { |
| 877 | destroy_workqueue(board_dat->data->wk); |
| 878 | board_dat->data->wk = NULL; |
| 879 | dev_dbg(&board_dat->pdev->dev, |
| 880 | "%s destroy_workqueue invoked successfully\n", |
| 881 | __func__); |
| 882 | } |
| 883 | |
| 884 | /* disable interrupts & free IRQ */ |
| 885 | if (board_dat->irq_reg_sts) { |
| 886 | /* disable interrupts */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 887 | pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0, |
| 888 | PCH_ALL); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 889 | |
| 890 | /* free IRQ */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 891 | free_irq(board_dat->pdev->irq, board_dat); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 892 | |
| 893 | dev_dbg(&board_dat->pdev->dev, |
| 894 | "%s free_irq invoked successfully\n", __func__); |
| 895 | |
| 896 | board_dat->irq_reg_sts = false; |
| 897 | } |
| 898 | |
| 899 | /* unmap PCI base address */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 900 | if (board_dat->data->io_remap_addr != 0) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 901 | pci_iounmap(board_dat->pdev, board_dat->data->io_remap_addr); |
| 902 | |
| 903 | board_dat->data->io_remap_addr = 0; |
| 904 | |
| 905 | dev_dbg(&board_dat->pdev->dev, |
| 906 | "%s pci_iounmap invoked successfully\n", __func__); |
| 907 | } |
| 908 | |
| 909 | /* release PCI region */ |
| 910 | if (board_dat->pci_req_sts) { |
| 911 | pci_release_regions(board_dat->pdev); |
| 912 | dev_dbg(&board_dat->pdev->dev, |
| 913 | "%s pci_release_regions invoked successfully\n", |
| 914 | __func__); |
| 915 | board_dat->pci_req_sts = false; |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | static int pch_spi_get_resources(struct pch_spi_board_data *board_dat) |
| 920 | { |
| 921 | void __iomem *io_remap_addr; |
| 922 | int retval; |
| 923 | dev_dbg(&board_dat->pdev->dev, "%s ENTRY\n", __func__); |
| 924 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 925 | /* create workqueue */ |
| 926 | board_dat->data->wk = create_singlethread_workqueue(KBUILD_MODNAME); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 927 | if (!board_dat->data->wk) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 928 | dev_err(&board_dat->pdev->dev, |
| 929 | "%s create_singlet hread_workqueue failed\n", __func__); |
| 930 | retval = -EBUSY; |
| 931 | goto err_return; |
| 932 | } |
| 933 | |
| 934 | dev_dbg(&board_dat->pdev->dev, |
| 935 | "%s create_singlethread_workqueue success\n", __func__); |
| 936 | |
| 937 | retval = pci_request_regions(board_dat->pdev, KBUILD_MODNAME); |
| 938 | if (retval != 0) { |
| 939 | dev_err(&board_dat->pdev->dev, |
| 940 | "%s request_region failed\n", __func__); |
| 941 | goto err_return; |
| 942 | } |
| 943 | |
| 944 | board_dat->pci_req_sts = true; |
| 945 | |
| 946 | io_remap_addr = pci_iomap(board_dat->pdev, 1, 0); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 947 | if (io_remap_addr == 0) { |
| 948 | dev_err(&board_dat->pdev->dev, |
| 949 | "%s pci_iomap failed\n", __func__); |
| 950 | retval = -ENOMEM; |
| 951 | goto err_return; |
| 952 | } |
| 953 | |
| 954 | /* calculate base address for all channels */ |
| 955 | board_dat->data->io_remap_addr = io_remap_addr; |
| 956 | |
| 957 | /* reset PCH SPI h/w */ |
| 958 | pch_spi_reset(board_dat->data->master); |
| 959 | dev_dbg(&board_dat->pdev->dev, |
| 960 | "%s pch_spi_reset invoked successfully\n", __func__); |
| 961 | |
| 962 | /* register IRQ */ |
| 963 | retval = request_irq(board_dat->pdev->irq, pch_spi_handler, |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 964 | IRQF_SHARED, KBUILD_MODNAME, board_dat); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 965 | if (retval != 0) { |
| 966 | dev_err(&board_dat->pdev->dev, |
| 967 | "%s request_irq failed\n", __func__); |
| 968 | goto err_return; |
| 969 | } |
| 970 | |
| 971 | dev_dbg(&board_dat->pdev->dev, "%s request_irq returned=%d\n", |
| 972 | __func__, retval); |
| 973 | |
| 974 | board_dat->irq_reg_sts = true; |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 975 | dev_dbg(&board_dat->pdev->dev, "%s data->irq_reg_sts=true\n", __func__); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 976 | |
| 977 | err_return: |
| 978 | if (retval != 0) { |
| 979 | dev_err(&board_dat->pdev->dev, |
| 980 | "%s FAIL:invoking pch_spi_free_resources\n", __func__); |
| 981 | pch_spi_free_resources(board_dat); |
| 982 | } |
| 983 | |
| 984 | dev_dbg(&board_dat->pdev->dev, "%s Return=%d\n", __func__, retval); |
| 985 | |
| 986 | return retval; |
| 987 | } |
| 988 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 989 | static int pch_spi_probe(struct pci_dev *pdev, const struct pci_device_id *id) |
| 990 | { |
| 991 | |
| 992 | struct spi_master *master; |
| 993 | |
| 994 | struct pch_spi_board_data *board_dat; |
| 995 | int retval; |
| 996 | |
| 997 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
| 998 | |
| 999 | /* allocate memory for private data */ |
| 1000 | board_dat = kzalloc(sizeof(struct pch_spi_board_data), GFP_KERNEL); |
| 1001 | if (board_dat == NULL) { |
| 1002 | dev_err(&pdev->dev, |
| 1003 | " %s memory allocation for private data failed\n", |
| 1004 | __func__); |
| 1005 | retval = -ENOMEM; |
| 1006 | goto err_kmalloc; |
| 1007 | } |
| 1008 | |
| 1009 | dev_dbg(&pdev->dev, |
| 1010 | "%s memory allocation for private data success\n", __func__); |
| 1011 | |
| 1012 | /* enable PCI device */ |
| 1013 | retval = pci_enable_device(pdev); |
| 1014 | if (retval != 0) { |
| 1015 | dev_err(&pdev->dev, "%s pci_enable_device FAILED\n", __func__); |
| 1016 | |
| 1017 | goto err_pci_en_device; |
| 1018 | } |
| 1019 | |
| 1020 | dev_dbg(&pdev->dev, "%s pci_enable_device returned=%d\n", |
| 1021 | __func__, retval); |
| 1022 | |
| 1023 | board_dat->pdev = pdev; |
| 1024 | |
| 1025 | /* alllocate memory for SPI master */ |
| 1026 | master = spi_alloc_master(&pdev->dev, sizeof(struct pch_spi_data)); |
| 1027 | if (master == NULL) { |
| 1028 | retval = -ENOMEM; |
| 1029 | dev_err(&pdev->dev, "%s Fail.\n", __func__); |
| 1030 | goto err_spi_alloc_master; |
| 1031 | } |
| 1032 | |
| 1033 | dev_dbg(&pdev->dev, |
| 1034 | "%s spi_alloc_master returned non NULL\n", __func__); |
| 1035 | |
| 1036 | /* initialize members of SPI master */ |
| 1037 | master->bus_num = -1; |
| 1038 | master->num_chipselect = PCH_MAX_CS; |
| 1039 | master->setup = pch_spi_setup; |
| 1040 | master->transfer = pch_spi_transfer; |
| 1041 | dev_dbg(&pdev->dev, |
| 1042 | "%s transfer member of SPI master initialized\n", __func__); |
| 1043 | |
| 1044 | board_dat->data = spi_master_get_devdata(master); |
| 1045 | |
| 1046 | board_dat->data->master = master; |
| 1047 | board_dat->data->n_curnt_chip = 255; |
| 1048 | board_dat->data->board_dat = board_dat; |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1049 | board_dat->data->status = STATUS_RUNNING; |
| 1050 | |
| 1051 | INIT_LIST_HEAD(&board_dat->data->queue); |
| 1052 | spin_lock_init(&board_dat->data->lock); |
| 1053 | INIT_WORK(&board_dat->data->work, pch_spi_process_messages); |
| 1054 | init_waitqueue_head(&board_dat->data->wait); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1055 | |
| 1056 | /* allocate resources for PCH SPI */ |
| 1057 | retval = pch_spi_get_resources(board_dat); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1058 | if (retval) { |
| 1059 | dev_err(&pdev->dev, "%s fail(retval=%d)\n", __func__, retval); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1060 | goto err_spi_get_resources; |
| 1061 | } |
| 1062 | |
| 1063 | dev_dbg(&pdev->dev, "%s pch_spi_get_resources returned=%d\n", |
| 1064 | __func__, retval); |
| 1065 | |
| 1066 | /* save private data in dev */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1067 | pci_set_drvdata(pdev, board_dat); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1068 | dev_dbg(&pdev->dev, "%s invoked pci_set_drvdata\n", __func__); |
| 1069 | |
| 1070 | /* set master mode */ |
| 1071 | pch_spi_set_master_mode(master); |
| 1072 | dev_dbg(&pdev->dev, |
| 1073 | "%s invoked pch_spi_set_master_mode\n", __func__); |
| 1074 | |
| 1075 | /* Register the controller with the SPI core. */ |
| 1076 | retval = spi_register_master(master); |
| 1077 | if (retval != 0) { |
| 1078 | dev_err(&pdev->dev, |
| 1079 | "%s spi_register_master FAILED\n", __func__); |
| 1080 | goto err_spi_reg_master; |
| 1081 | } |
| 1082 | |
| 1083 | dev_dbg(&pdev->dev, "%s spi_register_master returned=%d\n", |
| 1084 | __func__, retval); |
| 1085 | |
| 1086 | |
| 1087 | return 0; |
| 1088 | |
| 1089 | err_spi_reg_master: |
| 1090 | spi_unregister_master(master); |
| 1091 | err_spi_get_resources: |
| 1092 | err_spi_alloc_master: |
| 1093 | spi_master_put(master); |
| 1094 | pci_disable_device(pdev); |
| 1095 | err_pci_en_device: |
| 1096 | kfree(board_dat); |
| 1097 | err_kmalloc: |
| 1098 | return retval; |
| 1099 | } |
| 1100 | |
| 1101 | static void pch_spi_remove(struct pci_dev *pdev) |
| 1102 | { |
| 1103 | struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1104 | int count; |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1105 | |
| 1106 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
| 1107 | |
| 1108 | if (!board_dat) { |
| 1109 | dev_err(&pdev->dev, |
| 1110 | "%s pci_get_drvdata returned NULL\n", __func__); |
| 1111 | return; |
| 1112 | } |
| 1113 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1114 | /* check for any pending messages; no action is taken if the queue |
| 1115 | * is still full; but at least we tried. Unload anyway */ |
| 1116 | count = 500; |
| 1117 | spin_lock(&board_dat->data->lock); |
| 1118 | board_dat->data->status = STATUS_EXITING; |
| 1119 | while ((list_empty(&board_dat->data->queue) == 0) && --count) { |
| 1120 | dev_dbg(&board_dat->pdev->dev, "%s :queue not empty\n", |
| 1121 | __func__); |
| 1122 | spin_unlock(&board_dat->data->lock); |
| 1123 | msleep(PCH_SLEEP_TIME); |
| 1124 | spin_lock(&board_dat->data->lock); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1125 | } |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1126 | spin_unlock(&board_dat->data->lock); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1127 | |
| 1128 | /* Free resources allocated for PCH SPI */ |
| 1129 | pch_spi_free_resources(board_dat); |
| 1130 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1131 | spi_unregister_master(board_dat->data->master); |
| 1132 | |
| 1133 | /* free memory for private data */ |
| 1134 | kfree(board_dat); |
| 1135 | |
| 1136 | pci_set_drvdata(pdev, NULL); |
| 1137 | |
| 1138 | /* disable PCI device */ |
| 1139 | pci_disable_device(pdev); |
| 1140 | |
| 1141 | dev_dbg(&pdev->dev, "%s invoked pci_disable_device\n", __func__); |
| 1142 | } |
| 1143 | |
| 1144 | #ifdef CONFIG_PM |
| 1145 | static int pch_spi_suspend(struct pci_dev *pdev, pm_message_t state) |
| 1146 | { |
| 1147 | u8 count; |
| 1148 | int retval; |
| 1149 | |
| 1150 | struct pch_spi_board_data *board_dat = pci_get_drvdata(pdev); |
| 1151 | |
| 1152 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
| 1153 | |
| 1154 | if (!board_dat) { |
| 1155 | dev_err(&pdev->dev, |
| 1156 | "%s pci_get_drvdata returned NULL\n", __func__); |
| 1157 | return -EFAULT; |
| 1158 | } |
| 1159 | |
| 1160 | retval = 0; |
| 1161 | board_dat->suspend_sts = true; |
| 1162 | |
| 1163 | /* check if the current message is processed: |
| 1164 | Only after thats done the transfer will be suspended */ |
| 1165 | count = 255; |
| 1166 | while ((--count) > 0) { |
| 1167 | if (!(board_dat->data->bcurrent_msg_processing)) { |
| 1168 | dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_" |
| 1169 | "msg_processing = false\n", __func__); |
| 1170 | break; |
| 1171 | } else { |
| 1172 | dev_dbg(&pdev->dev, "%s board_dat->data->bCurrent_msg_" |
| 1173 | "processing = true\n", __func__); |
| 1174 | } |
| 1175 | msleep(PCH_SLEEP_TIME); |
| 1176 | } |
| 1177 | |
| 1178 | /* Free IRQ */ |
| 1179 | if (board_dat->irq_reg_sts) { |
| 1180 | /* disable all interrupts */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1181 | pch_spi_setclr_reg(board_dat->data->master, PCH_SPCR, 0, |
| 1182 | PCH_ALL); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1183 | pch_spi_reset(board_dat->data->master); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1184 | |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1185 | free_irq(board_dat->pdev->irq, board_dat); |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1186 | |
| 1187 | board_dat->irq_reg_sts = false; |
| 1188 | dev_dbg(&pdev->dev, |
| 1189 | "%s free_irq invoked successfully.\n", __func__); |
| 1190 | } |
| 1191 | |
| 1192 | /* save config space */ |
| 1193 | retval = pci_save_state(pdev); |
| 1194 | |
| 1195 | if (retval == 0) { |
| 1196 | dev_dbg(&pdev->dev, "%s pci_save_state returned=%d\n", |
| 1197 | __func__, retval); |
| 1198 | /* disable PM notifications */ |
| 1199 | pci_enable_wake(pdev, PCI_D3hot, 0); |
| 1200 | dev_dbg(&pdev->dev, |
| 1201 | "%s pci_enable_wake invoked successfully\n", __func__); |
| 1202 | /* disable PCI device */ |
| 1203 | pci_disable_device(pdev); |
| 1204 | dev_dbg(&pdev->dev, |
| 1205 | "%s pci_disable_device invoked successfully\n", |
| 1206 | __func__); |
| 1207 | /* move device to D3hot state */ |
| 1208 | pci_set_power_state(pdev, PCI_D3hot); |
| 1209 | dev_dbg(&pdev->dev, |
| 1210 | "%s pci_set_power_state invoked successfully\n", |
| 1211 | __func__); |
| 1212 | } else { |
| 1213 | dev_err(&pdev->dev, "%s pci_save_state failed\n", __func__); |
| 1214 | } |
| 1215 | |
| 1216 | dev_dbg(&pdev->dev, "%s return=%d\n", __func__, retval); |
| 1217 | |
| 1218 | return retval; |
| 1219 | } |
| 1220 | |
| 1221 | static int pch_spi_resume(struct pci_dev *pdev) |
| 1222 | { |
| 1223 | int retval; |
| 1224 | |
| 1225 | struct pch_spi_board_data *board = pci_get_drvdata(pdev); |
| 1226 | dev_dbg(&pdev->dev, "%s ENTRY\n", __func__); |
| 1227 | |
| 1228 | if (!board) { |
| 1229 | dev_err(&pdev->dev, |
| 1230 | "%s pci_get_drvdata returned NULL\n", __func__); |
| 1231 | return -EFAULT; |
| 1232 | } |
| 1233 | |
| 1234 | /* move device to DO power state */ |
| 1235 | pci_set_power_state(pdev, PCI_D0); |
| 1236 | |
| 1237 | /* restore state */ |
| 1238 | pci_restore_state(pdev); |
| 1239 | |
| 1240 | retval = pci_enable_device(pdev); |
| 1241 | if (retval < 0) { |
| 1242 | dev_err(&pdev->dev, |
| 1243 | "%s pci_enable_device failed\n", __func__); |
| 1244 | } else { |
| 1245 | /* disable PM notifications */ |
| 1246 | pci_enable_wake(pdev, PCI_D3hot, 0); |
| 1247 | |
| 1248 | /* register IRQ handler */ |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1249 | if (!board->irq_reg_sts) { |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1250 | /* register IRQ */ |
| 1251 | retval = request_irq(board->pdev->irq, pch_spi_handler, |
| 1252 | IRQF_SHARED, KBUILD_MODNAME, |
| 1253 | board); |
| 1254 | if (retval < 0) { |
| 1255 | dev_err(&pdev->dev, |
| 1256 | "%s request_irq failed\n", __func__); |
| 1257 | return retval; |
| 1258 | } |
| 1259 | board->irq_reg_sts = true; |
| 1260 | |
| 1261 | /* reset PCH SPI h/w */ |
| 1262 | pch_spi_reset(board->data->master); |
| 1263 | pch_spi_set_master_mode(board->data->master); |
| 1264 | |
| 1265 | /* set suspend status to false */ |
| 1266 | board->suspend_sts = false; |
| 1267 | |
| 1268 | } |
| 1269 | } |
| 1270 | |
| 1271 | dev_dbg(&pdev->dev, "%s returning=%d\n", __func__, retval); |
| 1272 | |
| 1273 | return retval; |
| 1274 | } |
| 1275 | #else |
| 1276 | #define pch_spi_suspend NULL |
| 1277 | #define pch_spi_resume NULL |
| 1278 | |
| 1279 | #endif |
| 1280 | |
| 1281 | static struct pci_driver pch_spi_pcidev = { |
| 1282 | .name = "pch_spi", |
| 1283 | .id_table = pch_spi_pcidev_id, |
| 1284 | .probe = pch_spi_probe, |
| 1285 | .remove = pch_spi_remove, |
| 1286 | .suspend = pch_spi_suspend, |
| 1287 | .resume = pch_spi_resume, |
| 1288 | }; |
| 1289 | |
| 1290 | static int __init pch_spi_init(void) |
| 1291 | { |
| 1292 | return pci_register_driver(&pch_spi_pcidev); |
| 1293 | } |
| 1294 | module_init(pch_spi_init); |
| 1295 | |
Masayuki Ohtake | e8b17b5 | 2010-10-08 12:44:49 -0600 | [diff] [blame] | 1296 | static void __exit pch_spi_exit(void) |
| 1297 | { |
| 1298 | pci_unregister_driver(&pch_spi_pcidev); |
| 1299 | } |
| 1300 | module_exit(pch_spi_exit); |
| 1301 | |
| 1302 | MODULE_LICENSE("GPL"); |
Grant Likely | 65308c4 | 2010-09-29 17:31:34 +0900 | [diff] [blame] | 1303 | MODULE_DESCRIPTION("Topcliff PCH SPI PCI Driver"); |