Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1 | /* |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 2 | * Simple synchronous serial port driver for ETRAX FS and ARTPEC-3. |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 3 | * |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 4 | * Copyright (c) 2005, 2008 Axis Communications AB |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 5 | * Author: Mikael Starvik |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/kernel.h> |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 11 | #include <linux/types.h> |
| 12 | #include <linux/errno.h> |
| 13 | #include <linux/major.h> |
| 14 | #include <linux/sched.h> |
Arnd Bergmann | 0890b58 | 2010-09-11 18:18:22 +0200 | [diff] [blame] | 15 | #include <linux/mutex.h> |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 16 | #include <linux/interrupt.h> |
| 17 | #include <linux/poll.h> |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 18 | #include <linux/fs.h> |
| 19 | #include <linux/cdev.h> |
| 20 | #include <linux/device.h> |
Arnd Bergmann | 329fddd | 2014-01-02 13:07:37 +0100 | [diff] [blame] | 21 | #include <linux/wait.h> |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 22 | |
| 23 | #include <asm/io.h> |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 24 | #include <mach/dma.h> |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 25 | #include <pinmux.h> |
| 26 | #include <hwregs/reg_rdwr.h> |
| 27 | #include <hwregs/sser_defs.h> |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 28 | #include <hwregs/timer_defs.h> |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 29 | #include <hwregs/dma_defs.h> |
| 30 | #include <hwregs/dma.h> |
| 31 | #include <hwregs/intr_vect_defs.h> |
| 32 | #include <hwregs/intr_vect.h> |
| 33 | #include <hwregs/reg_map.h> |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 34 | #include <asm/sync_serial.h> |
| 35 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 36 | |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 37 | /* The receiver is a bit tricky because of the continuous stream of data.*/ |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 38 | /* */ |
| 39 | /* Three DMA descriptors are linked together. Each DMA descriptor is */ |
| 40 | /* responsible for port->bufchunk of a common buffer. */ |
| 41 | /* */ |
| 42 | /* +---------------------------------------------+ */ |
| 43 | /* | +----------+ +----------+ +----------+ | */ |
| 44 | /* +-> | Descr[0] |-->| Descr[1] |-->| Descr[2] |-+ */ |
| 45 | /* +----------+ +----------+ +----------+ */ |
| 46 | /* | | | */ |
| 47 | /* v v v */ |
| 48 | /* +-------------------------------------+ */ |
| 49 | /* | BUFFER | */ |
| 50 | /* +-------------------------------------+ */ |
| 51 | /* |<- data_avail ->| */ |
| 52 | /* readp writep */ |
| 53 | /* */ |
| 54 | /* If the application keeps up the pace readp will be right after writep.*/ |
| 55 | /* If the application can't keep the pace we have to throw away data. */ |
| 56 | /* The idea is that readp should be ready with the data pointed out by */ |
| 57 | /* Descr[i] when the DMA has filled in Descr[i+1]. */ |
| 58 | /* Otherwise we will discard */ |
| 59 | /* the rest of the data pointed out by Descr1 and set readp to the start */ |
| 60 | /* of Descr2 */ |
| 61 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 62 | /* IN_BUFFER_SIZE should be a multiple of 6 to make sure that 24 bit */ |
| 63 | /* words can be handled */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 64 | #define IN_DESCR_SIZE SSP_INPUT_CHUNK_SIZE |
| 65 | #define NBR_IN_DESCR (8*6) |
| 66 | #define IN_BUFFER_SIZE (IN_DESCR_SIZE * NBR_IN_DESCR) |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 67 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 68 | #define NBR_OUT_DESCR 8 |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 69 | #define OUT_BUFFER_SIZE (1024 * NBR_OUT_DESCR) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 70 | |
| 71 | #define DEFAULT_FRAME_RATE 0 |
| 72 | #define DEFAULT_WORD_RATE 7 |
| 73 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 74 | /* To be removed when we move to pure udev. */ |
| 75 | #define SYNC_SERIAL_MAJOR 125 |
| 76 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 77 | /* NOTE: Enabling some debug will likely cause overrun or underrun, |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 78 | * especially if manual mode is used. |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 79 | */ |
| 80 | #define DEBUG(x) |
| 81 | #define DEBUGREAD(x) |
| 82 | #define DEBUGWRITE(x) |
| 83 | #define DEBUGPOLL(x) |
| 84 | #define DEBUGRXINT(x) |
| 85 | #define DEBUGTXINT(x) |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 86 | #define DEBUGTRDMA(x) |
| 87 | #define DEBUGOUTBUF(x) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 88 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 89 | enum syncser_irq_setup { |
| 90 | no_irq_setup = 0, |
| 91 | dma_irq_setup = 1, |
| 92 | manual_irq_setup = 2, |
| 93 | }; |
| 94 | |
| 95 | struct sync_port { |
| 96 | unsigned long regi_sser; |
| 97 | unsigned long regi_dmain; |
| 98 | unsigned long regi_dmaout; |
| 99 | |
| 100 | /* Interrupt vectors. */ |
| 101 | unsigned long dma_in_intr_vect; /* Used for DMA in. */ |
| 102 | unsigned long dma_out_intr_vect; /* Used for DMA out. */ |
| 103 | unsigned long syncser_intr_vect; /* Used when no DMA. */ |
| 104 | |
| 105 | /* DMA number for in and out. */ |
| 106 | unsigned int dma_in_nbr; |
| 107 | unsigned int dma_out_nbr; |
| 108 | |
| 109 | /* DMA owner. */ |
| 110 | enum dma_owner req_dma; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 111 | |
| 112 | char started; /* 1 if port has been started */ |
| 113 | char port_nbr; /* Port 0 or 1 */ |
| 114 | char busy; /* 1 if port is busy */ |
| 115 | |
| 116 | char enabled; /* 1 if port is enabled */ |
| 117 | char use_dma; /* 1 if port uses dma */ |
| 118 | char tr_running; |
| 119 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 120 | enum syncser_irq_setup init_irqs; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 121 | int output; |
| 122 | int input; |
| 123 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 124 | /* Next byte to be read by application */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 125 | unsigned char *readp; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 126 | /* Next byte to be written by etrax */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 127 | unsigned char *writep; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 128 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 129 | unsigned int in_buffer_size; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 130 | unsigned int in_buffer_len; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 131 | unsigned int inbufchunk; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 132 | /* Data buffers for in and output. */ |
| 133 | unsigned char out_buffer[OUT_BUFFER_SIZE] __aligned(32); |
| 134 | unsigned char in_buffer[IN_BUFFER_SIZE] __aligned(32); |
| 135 | unsigned char flip[IN_BUFFER_SIZE] __aligned(32); |
| 136 | struct timespec timestamp[NBR_IN_DESCR]; |
| 137 | struct dma_descr_data *next_rx_desc; |
| 138 | struct dma_descr_data *prev_rx_desc; |
| 139 | |
| 140 | struct timeval last_timestamp; |
| 141 | int read_ts_idx; |
| 142 | int write_ts_idx; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 143 | |
| 144 | /* Pointer to the first available descriptor in the ring, |
| 145 | * unless active_tr_descr == catch_tr_descr and a dma |
| 146 | * transfer is active */ |
| 147 | struct dma_descr_data *active_tr_descr; |
| 148 | |
| 149 | /* Pointer to the first allocated descriptor in the ring */ |
| 150 | struct dma_descr_data *catch_tr_descr; |
| 151 | |
| 152 | /* Pointer to the descriptor with the current end-of-list */ |
| 153 | struct dma_descr_data *prev_tr_descr; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 154 | int full; |
| 155 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 156 | /* Pointer to the first byte being read by DMA |
| 157 | * or current position in out_buffer if not using DMA. */ |
| 158 | unsigned char *out_rd_ptr; |
| 159 | |
| 160 | /* Number of bytes currently locked for being read by DMA */ |
| 161 | int out_buf_count; |
| 162 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 163 | dma_descr_context in_context __aligned(32); |
| 164 | dma_descr_context out_context __aligned(32); |
| 165 | dma_descr_data in_descr[NBR_IN_DESCR] __aligned(16); |
| 166 | dma_descr_data out_descr[NBR_OUT_DESCR] __aligned(16); |
| 167 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 168 | wait_queue_head_t out_wait_q; |
| 169 | wait_queue_head_t in_wait_q; |
| 170 | |
| 171 | spinlock_t lock; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 172 | }; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 173 | |
Arnd Bergmann | 0890b58 | 2010-09-11 18:18:22 +0200 | [diff] [blame] | 174 | static DEFINE_MUTEX(sync_serial_mutex); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 175 | static int etrax_sync_serial_init(void); |
| 176 | static void initialize_port(int portnbr); |
| 177 | static inline int sync_data_avail(struct sync_port *port); |
| 178 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 179 | static int sync_serial_open(struct inode *, struct file *); |
| 180 | static int sync_serial_release(struct inode *, struct file *); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 181 | static unsigned int sync_serial_poll(struct file *filp, poll_table *wait); |
| 182 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 183 | static long sync_serial_ioctl(struct file *file, |
| 184 | unsigned int cmd, unsigned long arg); |
| 185 | static int sync_serial_ioctl_unlocked(struct file *file, |
| 186 | unsigned int cmd, unsigned long arg); |
| 187 | static ssize_t sync_serial_write(struct file *file, const char __user *buf, |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 188 | size_t count, loff_t *ppos); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 189 | static ssize_t sync_serial_read(struct file *file, char __user *buf, |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 190 | size_t count, loff_t *ppos); |
| 191 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 192 | #if ((defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) && \ |
| 193 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA)) || \ |
| 194 | (defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) && \ |
| 195 | defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA))) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 196 | #define SYNC_SER_DMA |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 197 | #else |
| 198 | #define SYNC_SER_MANUAL |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 199 | #endif |
| 200 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 201 | #ifdef SYNC_SER_DMA |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 202 | static void start_dma_out(struct sync_port *port, const char *data, int count); |
| 203 | static void start_dma_in(struct sync_port *port); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 204 | static irqreturn_t tr_interrupt(int irq, void *dev_id); |
| 205 | static irqreturn_t rx_interrupt(int irq, void *dev_id); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 206 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 207 | #ifdef SYNC_SER_MANUAL |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 208 | static void send_word(struct sync_port *port); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 209 | static irqreturn_t manual_interrupt(int irq, void *dev_id); |
| 210 | #endif |
| 211 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 212 | #define artpec_pinmux_alloc_fixed crisv32_pinmux_alloc_fixed |
| 213 | #define artpec_request_dma crisv32_request_dma |
| 214 | #define artpec_free_dma crisv32_free_dma |
| 215 | |
| 216 | #ifdef CONFIG_ETRAXFS |
| 217 | /* ETRAX FS */ |
| 218 | #define DMA_OUT_NBR0 SYNC_SER0_TX_DMA_NBR |
| 219 | #define DMA_IN_NBR0 SYNC_SER0_RX_DMA_NBR |
| 220 | #define DMA_OUT_NBR1 SYNC_SER1_TX_DMA_NBR |
| 221 | #define DMA_IN_NBR1 SYNC_SER1_RX_DMA_NBR |
| 222 | #define PINMUX_SSER0 pinmux_sser0 |
| 223 | #define PINMUX_SSER1 pinmux_sser1 |
| 224 | #define SYNCSER_INST0 regi_sser0 |
| 225 | #define SYNCSER_INST1 regi_sser1 |
| 226 | #define SYNCSER_INTR_VECT0 SSER0_INTR_VECT |
| 227 | #define SYNCSER_INTR_VECT1 SSER1_INTR_VECT |
| 228 | #define OUT_DMA_INST0 regi_dma4 |
| 229 | #define IN_DMA_INST0 regi_dma5 |
| 230 | #define DMA_OUT_INTR_VECT0 DMA4_INTR_VECT |
| 231 | #define DMA_OUT_INTR_VECT1 DMA7_INTR_VECT |
| 232 | #define DMA_IN_INTR_VECT0 DMA5_INTR_VECT |
| 233 | #define DMA_IN_INTR_VECT1 DMA6_INTR_VECT |
| 234 | #define REQ_DMA_SYNCSER0 dma_sser0 |
| 235 | #define REQ_DMA_SYNCSER1 dma_sser1 |
| 236 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL1_DMA) |
| 237 | #define PORT1_DMA 1 |
| 238 | #else |
| 239 | #define PORT1_DMA 0 |
| 240 | #endif |
| 241 | #elif defined(CONFIG_CRIS_MACH_ARTPEC3) |
| 242 | /* ARTPEC-3 */ |
| 243 | #define DMA_OUT_NBR0 SYNC_SER_TX_DMA_NBR |
| 244 | #define DMA_IN_NBR0 SYNC_SER_RX_DMA_NBR |
| 245 | #define PINMUX_SSER0 pinmux_sser |
| 246 | #define SYNCSER_INST0 regi_sser |
| 247 | #define SYNCSER_INTR_VECT0 SSER_INTR_VECT |
| 248 | #define OUT_DMA_INST0 regi_dma6 |
| 249 | #define IN_DMA_INST0 regi_dma7 |
| 250 | #define DMA_OUT_INTR_VECT0 DMA6_INTR_VECT |
| 251 | #define DMA_IN_INTR_VECT0 DMA7_INTR_VECT |
| 252 | #define REQ_DMA_SYNCSER0 dma_sser |
| 253 | #define REQ_DMA_SYNCSER1 dma_sser |
| 254 | #endif |
| 255 | |
| 256 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL0_DMA) |
| 257 | #define PORT0_DMA 1 |
| 258 | #else |
| 259 | #define PORT0_DMA 0 |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 260 | #endif |
| 261 | |
| 262 | /* The ports */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 263 | static struct sync_port ports[] = { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 264 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 265 | .regi_sser = SYNCSER_INST0, |
| 266 | .regi_dmaout = OUT_DMA_INST0, |
| 267 | .regi_dmain = IN_DMA_INST0, |
| 268 | .use_dma = PORT0_DMA, |
| 269 | .dma_in_intr_vect = DMA_IN_INTR_VECT0, |
| 270 | .dma_out_intr_vect = DMA_OUT_INTR_VECT0, |
| 271 | .dma_in_nbr = DMA_IN_NBR0, |
| 272 | .dma_out_nbr = DMA_OUT_NBR0, |
| 273 | .req_dma = REQ_DMA_SYNCSER0, |
| 274 | .syncser_intr_vect = SYNCSER_INTR_VECT0, |
| 275 | }, |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 276 | #ifdef CONFIG_ETRAXFS |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 277 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 278 | .regi_sser = SYNCSER_INST1, |
| 279 | .regi_dmaout = regi_dma6, |
| 280 | .regi_dmain = regi_dma7, |
| 281 | .use_dma = PORT1_DMA, |
| 282 | .dma_in_intr_vect = DMA_IN_INTR_VECT1, |
| 283 | .dma_out_intr_vect = DMA_OUT_INTR_VECT1, |
| 284 | .dma_in_nbr = DMA_IN_NBR1, |
| 285 | .dma_out_nbr = DMA_OUT_NBR1, |
| 286 | .req_dma = REQ_DMA_SYNCSER1, |
| 287 | .syncser_intr_vect = SYNCSER_INTR_VECT1, |
| 288 | }, |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 289 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 290 | }; |
| 291 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 292 | #define NBR_PORTS ARRAY_SIZE(ports) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 293 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 294 | static const struct file_operations syncser_fops = { |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 295 | .owner = THIS_MODULE, |
| 296 | .write = sync_serial_write, |
| 297 | .read = sync_serial_read, |
| 298 | .poll = sync_serial_poll, |
| 299 | .unlocked_ioctl = sync_serial_ioctl, |
| 300 | .open = sync_serial_open, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 301 | .release = sync_serial_release, |
| 302 | .llseek = noop_llseek, |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 303 | }; |
| 304 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 305 | static dev_t syncser_first; |
| 306 | static int minor_count = NBR_PORTS; |
| 307 | #define SYNCSER_NAME "syncser" |
| 308 | static struct cdev *syncser_cdev; |
| 309 | static struct class *syncser_class; |
| 310 | |
| 311 | static void sync_serial_start_port(struct sync_port *port) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 312 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 313 | reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); |
| 314 | reg_sser_rw_tr_cfg tr_cfg = |
| 315 | REG_RD(sser, port->regi_sser, rw_tr_cfg); |
| 316 | reg_sser_rw_rec_cfg rec_cfg = |
| 317 | REG_RD(sser, port->regi_sser, rw_rec_cfg); |
| 318 | cfg.en = regk_sser_yes; |
| 319 | tr_cfg.tr_en = regk_sser_yes; |
| 320 | rec_cfg.rec_en = regk_sser_yes; |
| 321 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); |
| 322 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); |
| 323 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); |
| 324 | port->started = 1; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 325 | } |
| 326 | |
| 327 | static void __init initialize_port(int portnbr) |
| 328 | { |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 329 | struct sync_port *port = &ports[portnbr]; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 330 | reg_sser_rw_cfg cfg = { 0 }; |
| 331 | reg_sser_rw_frm_cfg frm_cfg = { 0 }; |
| 332 | reg_sser_rw_tr_cfg tr_cfg = { 0 }; |
| 333 | reg_sser_rw_rec_cfg rec_cfg = { 0 }; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 334 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 335 | DEBUG(pr_info("Init sync serial port %d\n", portnbr)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 336 | |
| 337 | port->port_nbr = portnbr; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 338 | port->init_irqs = no_irq_setup; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 339 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 340 | port->out_rd_ptr = port->out_buffer; |
| 341 | port->out_buf_count = 0; |
| 342 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 343 | port->output = 1; |
| 344 | port->input = 0; |
| 345 | |
| 346 | port->readp = port->flip; |
| 347 | port->writep = port->flip; |
| 348 | port->in_buffer_size = IN_BUFFER_SIZE; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 349 | port->in_buffer_len = 0; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 350 | port->inbufchunk = IN_DESCR_SIZE; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 351 | |
| 352 | port->read_ts_idx = 0; |
| 353 | port->write_ts_idx = 0; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 354 | |
| 355 | init_waitqueue_head(&port->out_wait_q); |
| 356 | init_waitqueue_head(&port->in_wait_q); |
| 357 | |
| 358 | spin_lock_init(&port->lock); |
| 359 | |
| 360 | cfg.out_clk_src = regk_sser_intern_clk; |
| 361 | cfg.out_clk_pol = regk_sser_pos; |
| 362 | cfg.clk_od_mode = regk_sser_no; |
| 363 | cfg.clk_dir = regk_sser_out; |
| 364 | cfg.gate_clk = regk_sser_no; |
| 365 | cfg.base_freq = regk_sser_f29_493; |
| 366 | cfg.clk_div = 256; |
| 367 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); |
| 368 | |
| 369 | frm_cfg.wordrate = DEFAULT_WORD_RATE; |
| 370 | frm_cfg.type = regk_sser_edge; |
| 371 | frm_cfg.frame_pin_dir = regk_sser_out; |
| 372 | frm_cfg.frame_pin_use = regk_sser_frm; |
| 373 | frm_cfg.status_pin_dir = regk_sser_in; |
| 374 | frm_cfg.status_pin_use = regk_sser_hold; |
| 375 | frm_cfg.out_on = regk_sser_tr; |
| 376 | frm_cfg.tr_delay = 1; |
| 377 | REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); |
| 378 | |
| 379 | tr_cfg.urun_stop = regk_sser_no; |
| 380 | tr_cfg.sample_size = 7; |
| 381 | tr_cfg.sh_dir = regk_sser_msbfirst; |
| 382 | tr_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 383 | #if 0 |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 384 | tr_cfg.rate_ctrl = regk_sser_bulk; |
| 385 | tr_cfg.data_pin_use = regk_sser_dout; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 386 | #else |
| 387 | tr_cfg.rate_ctrl = regk_sser_iso; |
| 388 | tr_cfg.data_pin_use = regk_sser_dout; |
| 389 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 390 | tr_cfg.bulk_wspace = 1; |
| 391 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); |
| 392 | |
| 393 | rec_cfg.sample_size = 7; |
| 394 | rec_cfg.sh_dir = regk_sser_msbfirst; |
| 395 | rec_cfg.use_dma = port->use_dma ? regk_sser_yes : regk_sser_no; |
| 396 | rec_cfg.fifo_thr = regk_sser_inf; |
| 397 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 398 | |
| 399 | #ifdef SYNC_SER_DMA |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 400 | { |
| 401 | int i; |
| 402 | /* Setup the descriptor ring for dma out/transmit. */ |
| 403 | for (i = 0; i < NBR_OUT_DESCR; i++) { |
| 404 | dma_descr_data *descr = &port->out_descr[i]; |
| 405 | descr->wait = 0; |
| 406 | descr->intr = 1; |
| 407 | descr->eol = 0; |
| 408 | descr->out_eop = 0; |
| 409 | descr->next = |
| 410 | (dma_descr_data *)virt_to_phys(&descr[i+1]); |
| 411 | } |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | /* Create a ring from the list. */ |
| 415 | port->out_descr[NBR_OUT_DESCR-1].next = |
| 416 | (dma_descr_data *)virt_to_phys(&port->out_descr[0]); |
| 417 | |
| 418 | /* Setup context for traversing the ring. */ |
| 419 | port->active_tr_descr = &port->out_descr[0]; |
| 420 | port->prev_tr_descr = &port->out_descr[NBR_OUT_DESCR-1]; |
| 421 | port->catch_tr_descr = &port->out_descr[0]; |
| 422 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static inline int sync_data_avail(struct sync_port *port) |
| 426 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 427 | return port->in_buffer_len; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | static int sync_serial_open(struct inode *inode, struct file *file) |
| 431 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 432 | int ret = 0; |
Eric Sesterhenn | 32ea086 | 2006-07-10 04:45:02 -0700 | [diff] [blame] | 433 | int dev = iminor(inode); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 434 | struct sync_port *port; |
| 435 | #ifdef SYNC_SER_DMA |
| 436 | reg_dma_rw_cfg cfg = { .en = regk_dma_yes }; |
| 437 | reg_dma_rw_intr_mask intr_mask = { .data = regk_dma_yes }; |
| 438 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 439 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 440 | DEBUG(pr_debug("Open sync serial port %d\n", dev)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 441 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 442 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { |
| 443 | DEBUG(pr_info("Invalid minor %d\n", dev)); |
| 444 | return -ENODEV; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 445 | } |
| 446 | port = &ports[dev]; |
| 447 | /* Allow open this device twice (assuming one reader and one writer) */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 448 | if (port->busy == 2) { |
| 449 | DEBUG(pr_info("syncser%d is busy\n", dev)); |
| 450 | return -EBUSY; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 451 | } |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 452 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 453 | mutex_lock(&sync_serial_mutex); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 454 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 455 | /* Clear any stale date left in the flip buffer */ |
| 456 | port->readp = port->writep = port->flip; |
| 457 | port->in_buffer_len = 0; |
| 458 | port->read_ts_idx = 0; |
| 459 | port->write_ts_idx = 0; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 460 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 461 | if (port->init_irqs != no_irq_setup) { |
| 462 | /* Init only on first call. */ |
| 463 | port->busy++; |
| 464 | mutex_unlock(&sync_serial_mutex); |
| 465 | return 0; |
| 466 | } |
| 467 | if (port->use_dma) { |
| 468 | #ifdef SYNC_SER_DMA |
| 469 | const char *tmp; |
| 470 | DEBUG(pr_info("Using DMA for syncser%d\n", dev)); |
| 471 | |
| 472 | tmp = dev == 0 ? "syncser0 tx" : "syncser1 tx"; |
| 473 | if (request_irq(port->dma_out_intr_vect, tr_interrupt, 0, |
| 474 | tmp, port)) { |
| 475 | pr_err("Can't alloc syncser%d TX IRQ", dev); |
| 476 | ret = -EBUSY; |
| 477 | goto unlock_and_exit; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 478 | } |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 479 | if (artpec_request_dma(port->dma_out_nbr, tmp, |
| 480 | DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { |
| 481 | free_irq(port->dma_out_intr_vect, port); |
| 482 | pr_err("Can't alloc syncser%d TX DMA", dev); |
| 483 | ret = -EBUSY; |
| 484 | goto unlock_and_exit; |
| 485 | } |
| 486 | tmp = dev == 0 ? "syncser0 rx" : "syncser1 rx"; |
| 487 | if (request_irq(port->dma_in_intr_vect, rx_interrupt, 0, |
| 488 | tmp, port)) { |
| 489 | artpec_free_dma(port->dma_out_nbr); |
| 490 | free_irq(port->dma_out_intr_vect, port); |
| 491 | pr_err("Can't alloc syncser%d RX IRQ", dev); |
| 492 | ret = -EBUSY; |
| 493 | goto unlock_and_exit; |
| 494 | } |
| 495 | if (artpec_request_dma(port->dma_in_nbr, tmp, |
| 496 | DMA_VERBOSE_ON_ERROR, 0, port->req_dma)) { |
| 497 | artpec_free_dma(port->dma_out_nbr); |
| 498 | free_irq(port->dma_out_intr_vect, port); |
| 499 | free_irq(port->dma_in_intr_vect, port); |
| 500 | pr_err("Can't alloc syncser%d RX DMA", dev); |
| 501 | ret = -EBUSY; |
| 502 | goto unlock_and_exit; |
| 503 | } |
| 504 | /* Enable DMAs */ |
| 505 | REG_WR(dma, port->regi_dmain, rw_cfg, cfg); |
| 506 | REG_WR(dma, port->regi_dmaout, rw_cfg, cfg); |
| 507 | /* Enable DMA IRQs */ |
| 508 | REG_WR(dma, port->regi_dmain, rw_intr_mask, intr_mask); |
| 509 | REG_WR(dma, port->regi_dmaout, rw_intr_mask, intr_mask); |
| 510 | /* Set up wordsize = 1 for DMAs. */ |
| 511 | DMA_WR_CMD(port->regi_dmain, regk_dma_set_w_size1); |
| 512 | DMA_WR_CMD(port->regi_dmaout, regk_dma_set_w_size1); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 513 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 514 | start_dma_in(port); |
| 515 | port->init_irqs = dma_irq_setup; |
| 516 | #endif |
| 517 | } else { /* !port->use_dma */ |
| 518 | #ifdef SYNC_SER_MANUAL |
| 519 | const char *tmp = dev == 0 ? "syncser0 manual irq" : |
| 520 | "syncser1 manual irq"; |
| 521 | if (request_irq(port->syncser_intr_vect, manual_interrupt, |
| 522 | 0, tmp, port)) { |
| 523 | pr_err("Can't alloc syncser%d manual irq", |
| 524 | dev); |
| 525 | ret = -EBUSY; |
| 526 | goto unlock_and_exit; |
| 527 | } |
| 528 | port->init_irqs = manual_irq_setup; |
| 529 | #else |
| 530 | panic("sync_serial: Manual mode not supported\n"); |
| 531 | #endif /* SYNC_SER_MANUAL */ |
| 532 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 533 | port->busy++; |
Jonathan Corbet | 0c401df | 2008-05-15 09:10:18 -0600 | [diff] [blame] | 534 | ret = 0; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 535 | |
| 536 | unlock_and_exit: |
Arnd Bergmann | 0890b58 | 2010-09-11 18:18:22 +0200 | [diff] [blame] | 537 | mutex_unlock(&sync_serial_mutex); |
Jonathan Corbet | 0c401df | 2008-05-15 09:10:18 -0600 | [diff] [blame] | 538 | return ret; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | static int sync_serial_release(struct inode *inode, struct file *file) |
| 542 | { |
Eric Sesterhenn | 32ea086 | 2006-07-10 04:45:02 -0700 | [diff] [blame] | 543 | int dev = iminor(inode); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 544 | struct sync_port *port; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 545 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 546 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { |
| 547 | DEBUG(pr_info("Invalid minor %d\n", dev)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 548 | return -ENODEV; |
| 549 | } |
| 550 | port = &ports[dev]; |
| 551 | if (port->busy) |
| 552 | port->busy--; |
| 553 | if (!port->busy) |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 554 | /* XXX */; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | static unsigned int sync_serial_poll(struct file *file, poll_table *wait) |
| 559 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 560 | int dev = iminor(file_inode(file)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 561 | unsigned int mask = 0; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 562 | struct sync_port *port; |
| 563 | DEBUGPOLL( |
| 564 | static unsigned int prev_mask; |
| 565 | ); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 566 | |
| 567 | port = &ports[dev]; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 568 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 569 | if (!port->started) |
| 570 | sync_serial_start_port(port); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 571 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 572 | poll_wait(file, &port->out_wait_q, wait); |
| 573 | poll_wait(file, &port->in_wait_q, wait); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 574 | |
| 575 | /* No active transfer, descriptors are available */ |
| 576 | if (port->output && !port->tr_running) |
| 577 | mask |= POLLOUT | POLLWRNORM; |
| 578 | |
| 579 | /* Descriptor and buffer space available. */ |
| 580 | if (port->output && |
| 581 | port->active_tr_descr != port->catch_tr_descr && |
| 582 | port->out_buf_count < OUT_BUFFER_SIZE) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 583 | mask |= POLLOUT | POLLWRNORM; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 584 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 585 | /* At least an inbufchunk of data */ |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 586 | if (port->input && sync_data_avail(port) >= port->inbufchunk) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 587 | mask |= POLLIN | POLLRDNORM; |
| 588 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 589 | DEBUGPOLL( |
| 590 | if (mask != prev_mask) |
| 591 | pr_info("sync_serial_poll: mask 0x%08X %s %s\n", |
| 592 | mask, |
| 593 | mask & POLLOUT ? "POLLOUT" : "", |
| 594 | mask & POLLIN ? "POLLIN" : ""); |
| 595 | prev_mask = mask; |
| 596 | ); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 597 | return mask; |
| 598 | } |
| 599 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 600 | static ssize_t __sync_serial_read(struct file *file, |
| 601 | char __user *buf, |
| 602 | size_t count, |
| 603 | loff_t *ppos, |
| 604 | struct timespec *ts) |
| 605 | { |
| 606 | unsigned long flags; |
David Howells | fb32c76 | 2015-01-13 17:57:53 +0000 | [diff] [blame] | 607 | int dev = MINOR(file_inode(file)->i_rdev); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 608 | int avail; |
| 609 | struct sync_port *port; |
| 610 | unsigned char *start; |
| 611 | unsigned char *end; |
| 612 | |
| 613 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { |
| 614 | DEBUG(pr_info("Invalid minor %d\n", dev)); |
| 615 | return -ENODEV; |
| 616 | } |
| 617 | port = &ports[dev]; |
| 618 | |
| 619 | if (!port->started) |
| 620 | sync_serial_start_port(port); |
| 621 | |
| 622 | /* Calculate number of available bytes */ |
| 623 | /* Save pointers to avoid that they are modified by interrupt */ |
| 624 | spin_lock_irqsave(&port->lock, flags); |
| 625 | start = port->readp; |
| 626 | end = port->writep; |
| 627 | spin_unlock_irqrestore(&port->lock, flags); |
| 628 | |
| 629 | while ((start == end) && !port->in_buffer_len) { |
| 630 | if (file->f_flags & O_NONBLOCK) |
| 631 | return -EAGAIN; |
| 632 | |
| 633 | wait_event_interruptible(port->in_wait_q, |
| 634 | !(start == end && !port->full)); |
| 635 | |
| 636 | if (signal_pending(current)) |
| 637 | return -EINTR; |
| 638 | |
| 639 | spin_lock_irqsave(&port->lock, flags); |
| 640 | start = port->readp; |
| 641 | end = port->writep; |
| 642 | spin_unlock_irqrestore(&port->lock, flags); |
| 643 | } |
| 644 | |
| 645 | DEBUGREAD(pr_info("R%d c %d ri %u wi %u /%u\n", |
| 646 | dev, count, |
| 647 | start - port->flip, end - port->flip, |
| 648 | port->in_buffer_size)); |
| 649 | |
| 650 | /* Lazy read, never return wrapped data. */ |
| 651 | if (end > start) |
| 652 | avail = end - start; |
| 653 | else |
| 654 | avail = port->flip + port->in_buffer_size - start; |
| 655 | |
| 656 | count = count > avail ? avail : count; |
| 657 | if (copy_to_user(buf, start, count)) |
| 658 | return -EFAULT; |
| 659 | |
| 660 | /* If timestamp requested, find timestamp of first returned byte |
| 661 | * and copy it. |
| 662 | * N.B: Applications that request timstamps MUST read data in |
| 663 | * chunks that are multiples of IN_DESCR_SIZE. |
| 664 | * Otherwise the timestamps will not be aligned to the data read. |
| 665 | */ |
| 666 | if (ts != NULL) { |
| 667 | int idx = port->read_ts_idx; |
| 668 | memcpy(ts, &port->timestamp[idx], sizeof(struct timespec)); |
| 669 | port->read_ts_idx += count / IN_DESCR_SIZE; |
| 670 | if (port->read_ts_idx >= NBR_IN_DESCR) |
| 671 | port->read_ts_idx = 0; |
| 672 | } |
| 673 | |
| 674 | spin_lock_irqsave(&port->lock, flags); |
| 675 | port->readp += count; |
| 676 | /* Check for wrap */ |
| 677 | if (port->readp >= port->flip + port->in_buffer_size) |
| 678 | port->readp = port->flip; |
| 679 | port->in_buffer_len -= count; |
| 680 | port->full = 0; |
| 681 | spin_unlock_irqrestore(&port->lock, flags); |
| 682 | |
| 683 | DEBUGREAD(pr_info("r %d\n", count)); |
| 684 | |
| 685 | return count; |
| 686 | } |
| 687 | |
| 688 | static ssize_t sync_serial_input(struct file *file, unsigned long arg) |
| 689 | { |
| 690 | struct ssp_request req; |
| 691 | int count; |
| 692 | int ret; |
| 693 | |
| 694 | /* Copy the request structure from user-mode. */ |
| 695 | ret = copy_from_user(&req, (struct ssp_request __user *)arg, |
| 696 | sizeof(struct ssp_request)); |
| 697 | |
| 698 | if (ret) { |
| 699 | DEBUG(pr_info("sync_serial_input copy from user failed\n")); |
| 700 | return -EFAULT; |
| 701 | } |
| 702 | |
| 703 | /* To get the timestamps aligned, make sure that 'len' |
| 704 | * is a multiple of IN_DESCR_SIZE. |
| 705 | */ |
| 706 | if ((req.len % IN_DESCR_SIZE) != 0) { |
| 707 | DEBUG(pr_info("sync_serial: req.len %x, IN_DESCR_SIZE %x\n", |
| 708 | req.len, IN_DESCR_SIZE)); |
| 709 | return -EFAULT; |
| 710 | } |
| 711 | |
| 712 | /* Do the actual read. */ |
| 713 | /* Note that req.buf is actually a pointer to user space. */ |
| 714 | count = __sync_serial_read(file, req.buf, req.len, |
| 715 | NULL, &req.ts); |
| 716 | |
| 717 | if (count < 0) { |
| 718 | DEBUG(pr_info("sync_serial_input read failed\n")); |
| 719 | return count; |
| 720 | } |
| 721 | |
| 722 | /* Copy the request back to user-mode. */ |
| 723 | ret = copy_to_user((struct ssp_request __user *)arg, &req, |
| 724 | sizeof(struct ssp_request)); |
| 725 | |
| 726 | if (ret) { |
| 727 | DEBUG(pr_info("syncser input copy2user failed\n")); |
| 728 | return -EFAULT; |
| 729 | } |
| 730 | |
| 731 | /* Return the number of bytes read. */ |
| 732 | return count; |
| 733 | } |
| 734 | |
| 735 | |
| 736 | static int sync_serial_ioctl_unlocked(struct file *file, |
| 737 | unsigned int cmd, unsigned long arg) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 738 | { |
| 739 | int return_val = 0; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 740 | int dma_w_size = regk_dma_set_w_size1; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 741 | int dev = iminor(file_inode(file)); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 742 | struct sync_port *port; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 743 | reg_sser_rw_tr_cfg tr_cfg; |
| 744 | reg_sser_rw_rec_cfg rec_cfg; |
| 745 | reg_sser_rw_frm_cfg frm_cfg; |
| 746 | reg_sser_rw_cfg gen_cfg; |
| 747 | reg_sser_rw_intr_mask intr_mask; |
| 748 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 749 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { |
| 750 | DEBUG(pr_info("Invalid minor %d\n", dev)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 751 | return -1; |
| 752 | } |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 753 | |
| 754 | if (cmd == SSP_INPUT) |
| 755 | return sync_serial_input(file, arg); |
| 756 | |
| 757 | port = &ports[dev]; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 758 | spin_lock_irq(&port->lock); |
| 759 | |
| 760 | tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); |
| 761 | rec_cfg = REG_RD(sser, port->regi_sser, rw_rec_cfg); |
| 762 | frm_cfg = REG_RD(sser, port->regi_sser, rw_frm_cfg); |
| 763 | gen_cfg = REG_RD(sser, port->regi_sser, rw_cfg); |
| 764 | intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); |
| 765 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 766 | switch (cmd) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 767 | case SSP_SPEED: |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 768 | if (GET_SPEED(arg) == CODEC) { |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 769 | unsigned int freq; |
| 770 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 771 | gen_cfg.base_freq = regk_sser_f32; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 772 | |
| 773 | /* Clock divider will internally be |
| 774 | * gen_cfg.clk_div + 1. |
| 775 | */ |
| 776 | |
| 777 | freq = GET_FREQ(arg); |
| 778 | switch (freq) { |
| 779 | case FREQ_32kHz: |
| 780 | case FREQ_64kHz: |
| 781 | case FREQ_128kHz: |
| 782 | case FREQ_256kHz: |
| 783 | gen_cfg.clk_div = 125 * |
| 784 | (1 << (freq - FREQ_256kHz)) - 1; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 785 | break; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 786 | case FREQ_512kHz: |
| 787 | gen_cfg.clk_div = 62; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 788 | break; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 789 | case FREQ_1MHz: |
| 790 | case FREQ_2MHz: |
| 791 | case FREQ_4MHz: |
| 792 | gen_cfg.clk_div = 8 * (1 << freq) - 1; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 793 | break; |
| 794 | } |
| 795 | } else if (GET_SPEED(arg) == CODEC_f32768) { |
| 796 | gen_cfg.base_freq = regk_sser_f32_768; |
| 797 | switch (GET_FREQ(arg)) { |
| 798 | case FREQ_4096kHz: |
| 799 | gen_cfg.clk_div = 7; |
| 800 | break; |
| 801 | default: |
| 802 | spin_unlock_irq(&port->lock); |
| 803 | return -EINVAL; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 804 | } |
| 805 | } else { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 806 | gen_cfg.base_freq = regk_sser_f29_493; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 807 | switch (GET_SPEED(arg)) { |
| 808 | case SSP150: |
| 809 | gen_cfg.clk_div = 29493000 / (150 * 8) - 1; |
| 810 | break; |
| 811 | case SSP300: |
| 812 | gen_cfg.clk_div = 29493000 / (300 * 8) - 1; |
| 813 | break; |
| 814 | case SSP600: |
| 815 | gen_cfg.clk_div = 29493000 / (600 * 8) - 1; |
| 816 | break; |
| 817 | case SSP1200: |
| 818 | gen_cfg.clk_div = 29493000 / (1200 * 8) - 1; |
| 819 | break; |
| 820 | case SSP2400: |
| 821 | gen_cfg.clk_div = 29493000 / (2400 * 8) - 1; |
| 822 | break; |
| 823 | case SSP4800: |
| 824 | gen_cfg.clk_div = 29493000 / (4800 * 8) - 1; |
| 825 | break; |
| 826 | case SSP9600: |
| 827 | gen_cfg.clk_div = 29493000 / (9600 * 8) - 1; |
| 828 | break; |
| 829 | case SSP19200: |
| 830 | gen_cfg.clk_div = 29493000 / (19200 * 8) - 1; |
| 831 | break; |
| 832 | case SSP28800: |
| 833 | gen_cfg.clk_div = 29493000 / (28800 * 8) - 1; |
| 834 | break; |
| 835 | case SSP57600: |
| 836 | gen_cfg.clk_div = 29493000 / (57600 * 8) - 1; |
| 837 | break; |
| 838 | case SSP115200: |
| 839 | gen_cfg.clk_div = 29493000 / (115200 * 8) - 1; |
| 840 | break; |
| 841 | case SSP230400: |
| 842 | gen_cfg.clk_div = 29493000 / (230400 * 8) - 1; |
| 843 | break; |
| 844 | case SSP460800: |
| 845 | gen_cfg.clk_div = 29493000 / (460800 * 8) - 1; |
| 846 | break; |
| 847 | case SSP921600: |
| 848 | gen_cfg.clk_div = 29493000 / (921600 * 8) - 1; |
| 849 | break; |
| 850 | case SSP3125000: |
| 851 | gen_cfg.base_freq = regk_sser_f100; |
| 852 | gen_cfg.clk_div = 100000000 / (3125000 * 8) - 1; |
| 853 | break; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 854 | |
| 855 | } |
| 856 | } |
| 857 | frm_cfg.wordrate = GET_WORD_RATE(arg); |
| 858 | |
| 859 | break; |
| 860 | case SSP_MODE: |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 861 | switch (arg) { |
| 862 | case MASTER_OUTPUT: |
| 863 | port->output = 1; |
| 864 | port->input = 0; |
| 865 | frm_cfg.out_on = regk_sser_tr; |
| 866 | frm_cfg.frame_pin_dir = regk_sser_out; |
| 867 | gen_cfg.clk_dir = regk_sser_out; |
| 868 | break; |
| 869 | case SLAVE_OUTPUT: |
| 870 | port->output = 1; |
| 871 | port->input = 0; |
| 872 | frm_cfg.frame_pin_dir = regk_sser_in; |
| 873 | gen_cfg.clk_dir = regk_sser_in; |
| 874 | break; |
| 875 | case MASTER_INPUT: |
| 876 | port->output = 0; |
| 877 | port->input = 1; |
| 878 | frm_cfg.frame_pin_dir = regk_sser_out; |
| 879 | frm_cfg.out_on = regk_sser_intern_tb; |
| 880 | gen_cfg.clk_dir = regk_sser_out; |
| 881 | break; |
| 882 | case SLAVE_INPUT: |
| 883 | port->output = 0; |
| 884 | port->input = 1; |
| 885 | frm_cfg.frame_pin_dir = regk_sser_in; |
| 886 | gen_cfg.clk_dir = regk_sser_in; |
| 887 | break; |
| 888 | case MASTER_BIDIR: |
| 889 | port->output = 1; |
| 890 | port->input = 1; |
| 891 | frm_cfg.frame_pin_dir = regk_sser_out; |
| 892 | frm_cfg.out_on = regk_sser_intern_tb; |
| 893 | gen_cfg.clk_dir = regk_sser_out; |
| 894 | break; |
| 895 | case SLAVE_BIDIR: |
| 896 | port->output = 1; |
| 897 | port->input = 1; |
| 898 | frm_cfg.frame_pin_dir = regk_sser_in; |
| 899 | gen_cfg.clk_dir = regk_sser_in; |
| 900 | break; |
| 901 | default: |
| 902 | spin_unlock_irq(&port->lock); |
| 903 | return -EINVAL; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 904 | } |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 905 | if (!port->use_dma || arg == MASTER_OUTPUT || |
| 906 | arg == SLAVE_OUTPUT) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 907 | intr_mask.rdav = regk_sser_yes; |
| 908 | break; |
| 909 | case SSP_FRAME_SYNC: |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 910 | if (arg & NORMAL_SYNC) { |
| 911 | frm_cfg.rec_delay = 1; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 912 | frm_cfg.tr_delay = 1; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 913 | } else if (arg & EARLY_SYNC) |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 914 | frm_cfg.rec_delay = frm_cfg.tr_delay = 0; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 915 | else if (arg & LATE_SYNC) { |
| 916 | frm_cfg.tr_delay = 2; |
| 917 | frm_cfg.rec_delay = 2; |
| 918 | } else if (arg & SECOND_WORD_SYNC) { |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 919 | frm_cfg.rec_delay = 7; |
| 920 | frm_cfg.tr_delay = 1; |
| 921 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 922 | |
| 923 | tr_cfg.bulk_wspace = frm_cfg.tr_delay; |
| 924 | frm_cfg.early_wend = regk_sser_yes; |
| 925 | if (arg & BIT_SYNC) |
| 926 | frm_cfg.type = regk_sser_edge; |
| 927 | else if (arg & WORD_SYNC) |
| 928 | frm_cfg.type = regk_sser_level; |
| 929 | else if (arg & EXTENDED_SYNC) |
| 930 | frm_cfg.early_wend = regk_sser_no; |
| 931 | |
| 932 | if (arg & SYNC_ON) |
| 933 | frm_cfg.frame_pin_use = regk_sser_frm; |
| 934 | else if (arg & SYNC_OFF) |
| 935 | frm_cfg.frame_pin_use = regk_sser_gio0; |
| 936 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 937 | dma_w_size = regk_dma_set_w_size2; |
| 938 | if (arg & WORD_SIZE_8) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 939 | rec_cfg.sample_size = tr_cfg.sample_size = 7; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 940 | dma_w_size = regk_dma_set_w_size1; |
| 941 | } else if (arg & WORD_SIZE_12) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 942 | rec_cfg.sample_size = tr_cfg.sample_size = 11; |
| 943 | else if (arg & WORD_SIZE_16) |
| 944 | rec_cfg.sample_size = tr_cfg.sample_size = 15; |
| 945 | else if (arg & WORD_SIZE_24) |
| 946 | rec_cfg.sample_size = tr_cfg.sample_size = 23; |
| 947 | else if (arg & WORD_SIZE_32) |
| 948 | rec_cfg.sample_size = tr_cfg.sample_size = 31; |
| 949 | |
| 950 | if (arg & BIT_ORDER_MSB) |
| 951 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; |
| 952 | else if (arg & BIT_ORDER_LSB) |
| 953 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_lsbfirst; |
| 954 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 955 | if (arg & FLOW_CONTROL_ENABLE) { |
| 956 | frm_cfg.status_pin_use = regk_sser_frm; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 957 | rec_cfg.fifo_thr = regk_sser_thr16; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 958 | } else if (arg & FLOW_CONTROL_DISABLE) { |
| 959 | frm_cfg.status_pin_use = regk_sser_gio0; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 960 | rec_cfg.fifo_thr = regk_sser_inf; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 961 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 962 | |
| 963 | if (arg & CLOCK_NOT_GATED) |
| 964 | gen_cfg.gate_clk = regk_sser_no; |
| 965 | else if (arg & CLOCK_GATED) |
| 966 | gen_cfg.gate_clk = regk_sser_yes; |
| 967 | |
| 968 | break; |
| 969 | case SSP_IPOLARITY: |
| 970 | /* NOTE!! negedge is considered NORMAL */ |
| 971 | if (arg & CLOCK_NORMAL) |
| 972 | rec_cfg.clk_pol = regk_sser_neg; |
| 973 | else if (arg & CLOCK_INVERT) |
| 974 | rec_cfg.clk_pol = regk_sser_pos; |
| 975 | |
| 976 | if (arg & FRAME_NORMAL) |
| 977 | frm_cfg.level = regk_sser_pos_hi; |
| 978 | else if (arg & FRAME_INVERT) |
| 979 | frm_cfg.level = regk_sser_neg_lo; |
| 980 | |
| 981 | if (arg & STATUS_NORMAL) |
| 982 | gen_cfg.hold_pol = regk_sser_pos; |
| 983 | else if (arg & STATUS_INVERT) |
| 984 | gen_cfg.hold_pol = regk_sser_neg; |
| 985 | break; |
| 986 | case SSP_OPOLARITY: |
| 987 | if (arg & CLOCK_NORMAL) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 988 | gen_cfg.out_clk_pol = regk_sser_pos; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 989 | else if (arg & CLOCK_INVERT) |
| 990 | gen_cfg.out_clk_pol = regk_sser_neg; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 991 | |
| 992 | if (arg & FRAME_NORMAL) |
| 993 | frm_cfg.level = regk_sser_pos_hi; |
| 994 | else if (arg & FRAME_INVERT) |
| 995 | frm_cfg.level = regk_sser_neg_lo; |
| 996 | |
| 997 | if (arg & STATUS_NORMAL) |
| 998 | gen_cfg.hold_pol = regk_sser_pos; |
| 999 | else if (arg & STATUS_INVERT) |
| 1000 | gen_cfg.hold_pol = regk_sser_neg; |
| 1001 | break; |
| 1002 | case SSP_SPI: |
| 1003 | rec_cfg.fifo_thr = regk_sser_inf; |
| 1004 | rec_cfg.sh_dir = tr_cfg.sh_dir = regk_sser_msbfirst; |
| 1005 | rec_cfg.sample_size = tr_cfg.sample_size = 7; |
| 1006 | frm_cfg.frame_pin_use = regk_sser_frm; |
| 1007 | frm_cfg.type = regk_sser_level; |
| 1008 | frm_cfg.tr_delay = 1; |
| 1009 | frm_cfg.level = regk_sser_neg_lo; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1010 | if (arg & SPI_SLAVE) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1011 | rec_cfg.clk_pol = regk_sser_neg; |
| 1012 | gen_cfg.clk_dir = regk_sser_in; |
| 1013 | port->input = 1; |
| 1014 | port->output = 0; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1015 | } else { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1016 | gen_cfg.out_clk_pol = regk_sser_pos; |
| 1017 | port->input = 0; |
| 1018 | port->output = 1; |
| 1019 | gen_cfg.clk_dir = regk_sser_out; |
| 1020 | } |
| 1021 | break; |
| 1022 | case SSP_INBUFCHUNK: |
| 1023 | break; |
| 1024 | default: |
| 1025 | return_val = -1; |
| 1026 | } |
| 1027 | |
| 1028 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1029 | if (port->started) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1030 | rec_cfg.rec_en = port->input; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1031 | gen_cfg.en = (port->output | port->input); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1032 | } |
| 1033 | |
| 1034 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); |
| 1035 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); |
| 1036 | REG_WR(sser, port->regi_sser, rw_frm_cfg, frm_cfg); |
| 1037 | REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); |
| 1038 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); |
| 1039 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1040 | |
| 1041 | if (cmd == SSP_FRAME_SYNC && (arg & (WORD_SIZE_8 | WORD_SIZE_12 | |
| 1042 | WORD_SIZE_16 | WORD_SIZE_24 | WORD_SIZE_32))) { |
| 1043 | int en = gen_cfg.en; |
| 1044 | gen_cfg.en = 0; |
| 1045 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); |
| 1046 | /* ##### Should DMA be stoped before we change dma size? */ |
| 1047 | DMA_WR_CMD(port->regi_dmain, dma_w_size); |
| 1048 | DMA_WR_CMD(port->regi_dmaout, dma_w_size); |
| 1049 | gen_cfg.en = en; |
| 1050 | REG_WR(sser, port->regi_sser, rw_cfg, gen_cfg); |
| 1051 | } |
| 1052 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1053 | spin_unlock_irq(&port->lock); |
| 1054 | return return_val; |
| 1055 | } |
| 1056 | |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 1057 | static long sync_serial_ioctl(struct file *file, |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1058 | unsigned int cmd, unsigned long arg) |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 1059 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1060 | long ret; |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 1061 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1062 | mutex_lock(&sync_serial_mutex); |
| 1063 | ret = sync_serial_ioctl_unlocked(file, cmd, arg); |
| 1064 | mutex_unlock(&sync_serial_mutex); |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 1065 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1066 | return ret; |
Jesper Nilsson | 90276a1 | 2010-07-30 19:04:37 +0200 | [diff] [blame] | 1067 | } |
| 1068 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1069 | /* NOTE: sync_serial_write does not support concurrency */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1070 | static ssize_t sync_serial_write(struct file *file, const char __user *buf, |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1071 | size_t count, loff_t *ppos) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1072 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1073 | int dev = iminor(file_inode(file)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1074 | DECLARE_WAITQUEUE(wait, current); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1075 | struct sync_port *port; |
| 1076 | int trunc_count; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1077 | unsigned long flags; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1078 | int bytes_free; |
| 1079 | int out_buf_count; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1080 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1081 | unsigned char *rd_ptr; /* First allocated byte in the buffer */ |
| 1082 | unsigned char *wr_ptr; /* First free byte in the buffer */ |
| 1083 | unsigned char *buf_stop_ptr; /* Last byte + 1 */ |
| 1084 | |
| 1085 | if (dev < 0 || dev >= NBR_PORTS || !ports[dev].enabled) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1086 | DEBUG(pr_info("Invalid minor %d\n", dev)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1087 | return -ENODEV; |
| 1088 | } |
| 1089 | port = &ports[dev]; |
| 1090 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1091 | /* |<- OUT_BUFFER_SIZE ->| |
| 1092 | * |<- out_buf_count ->| |
| 1093 | * |<- trunc_count ->| ...->| |
| 1094 | * ______________________________________________________ |
| 1095 | * | free | data | free | |
| 1096 | * |_________|___________________|________________________| |
| 1097 | * ^ rd_ptr ^ wr_ptr |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1098 | */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1099 | DEBUGWRITE(pr_info("W d%d c %u a: %p c: %p\n", |
| 1100 | port->port_nbr, count, port->active_tr_descr, |
| 1101 | port->catch_tr_descr)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1102 | |
| 1103 | /* Read variables that may be updated by interrupts */ |
| 1104 | spin_lock_irqsave(&port->lock, flags); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1105 | rd_ptr = port->out_rd_ptr; |
| 1106 | out_buf_count = port->out_buf_count; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1107 | spin_unlock_irqrestore(&port->lock, flags); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1108 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1109 | /* Check if resources are available */ |
| 1110 | if (port->tr_running && |
| 1111 | ((port->use_dma && port->active_tr_descr == port->catch_tr_descr) || |
| 1112 | out_buf_count >= OUT_BUFFER_SIZE)) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1113 | DEBUGWRITE(pr_info("sser%d full\n", dev)); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1114 | return -EAGAIN; |
| 1115 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1116 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1117 | buf_stop_ptr = port->out_buffer + OUT_BUFFER_SIZE; |
| 1118 | |
| 1119 | /* Determine pointer to the first free byte, before copying. */ |
| 1120 | wr_ptr = rd_ptr + out_buf_count; |
| 1121 | if (wr_ptr >= buf_stop_ptr) |
| 1122 | wr_ptr -= OUT_BUFFER_SIZE; |
| 1123 | |
| 1124 | /* If we wrap the ring buffer, let the user space program handle it by |
| 1125 | * truncating the data. This could be more elegant, small buffer |
| 1126 | * fragments may occur. |
| 1127 | */ |
| 1128 | bytes_free = OUT_BUFFER_SIZE - out_buf_count; |
| 1129 | if (wr_ptr + bytes_free > buf_stop_ptr) |
| 1130 | bytes_free = buf_stop_ptr - wr_ptr; |
| 1131 | trunc_count = (count < bytes_free) ? count : bytes_free; |
| 1132 | |
| 1133 | if (copy_from_user(wr_ptr, buf, trunc_count)) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1134 | return -EFAULT; |
| 1135 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1136 | DEBUGOUTBUF(pr_info("%-4d + %-4d = %-4d %p %p %p\n", |
| 1137 | out_buf_count, trunc_count, |
| 1138 | port->out_buf_count, port->out_buffer, |
| 1139 | wr_ptr, buf_stop_ptr)); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1140 | |
| 1141 | /* Make sure transmitter/receiver is running */ |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1142 | if (!port->started) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1143 | reg_sser_rw_cfg cfg = REG_RD(sser, port->regi_sser, rw_cfg); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1144 | reg_sser_rw_rec_cfg rec_cfg = |
| 1145 | REG_RD(sser, port->regi_sser, rw_rec_cfg); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1146 | cfg.en = regk_sser_yes; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1147 | rec_cfg.rec_en = port->input; |
| 1148 | REG_WR(sser, port->regi_sser, rw_cfg, cfg); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1149 | REG_WR(sser, port->regi_sser, rw_rec_cfg, rec_cfg); |
| 1150 | port->started = 1; |
| 1151 | } |
| 1152 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1153 | /* Setup wait if blocking */ |
| 1154 | if (!(file->f_flags & O_NONBLOCK)) { |
| 1155 | add_wait_queue(&port->out_wait_q, &wait); |
| 1156 | set_current_state(TASK_INTERRUPTIBLE); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1159 | spin_lock_irqsave(&port->lock, flags); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1160 | port->out_buf_count += trunc_count; |
| 1161 | if (port->use_dma) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1162 | #ifdef SYNC_SER_DMA |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1163 | start_dma_out(port, wr_ptr, trunc_count); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1164 | #endif |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1165 | } else if (!port->tr_running) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1166 | #ifdef SYNC_SER_MANUAL |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1167 | reg_sser_rw_intr_mask intr_mask; |
| 1168 | intr_mask = REG_RD(sser, port->regi_sser, rw_intr_mask); |
| 1169 | /* Start sender by writing data */ |
| 1170 | send_word(port); |
| 1171 | /* and enable transmitter ready IRQ */ |
| 1172 | intr_mask.trdy = 1; |
| 1173 | REG_WR(sser, port->regi_sser, rw_intr_mask, intr_mask); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1174 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1175 | } |
| 1176 | spin_unlock_irqrestore(&port->lock, flags); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1177 | |
| 1178 | /* Exit if non blocking */ |
| 1179 | if (file->f_flags & O_NONBLOCK) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1180 | DEBUGWRITE(pr_info("w d%d c %u %08x\n", |
| 1181 | port->port_nbr, trunc_count, |
| 1182 | REG_RD_INT(dma, port->regi_dmaout, r_intr))); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1183 | return trunc_count; |
| 1184 | } |
| 1185 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1186 | schedule(); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1187 | remove_wait_queue(&port->out_wait_q, &wait); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1188 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1189 | if (signal_pending(current)) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1190 | return -EINTR; |
Jesper Nilsson | cbca663 | 2008-01-24 14:30:01 +0100 | [diff] [blame] | 1191 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1192 | DEBUGWRITE(pr_info("w d%d c %u\n", port->port_nbr, trunc_count)); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1193 | return trunc_count; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1194 | } |
| 1195 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1196 | static ssize_t sync_serial_read(struct file *file, char __user *buf, |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1197 | size_t count, loff_t *ppos) |
| 1198 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1199 | return __sync_serial_read(file, buf, count, ppos, NULL); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1202 | #ifdef SYNC_SER_MANUAL |
| 1203 | static void send_word(struct sync_port *port) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1204 | { |
| 1205 | reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); |
| 1206 | reg_sser_rw_tr_data tr_data = {0}; |
| 1207 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1208 | switch (tr_cfg.sample_size) { |
| 1209 | case 8: |
| 1210 | port->out_buf_count--; |
| 1211 | tr_data.data = *port->out_rd_ptr++; |
| 1212 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
| 1213 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
| 1214 | port->out_rd_ptr = port->out_buffer; |
| 1215 | break; |
| 1216 | case 12: |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1217 | { |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1218 | int data = (*port->out_rd_ptr++) << 8; |
| 1219 | data |= *port->out_rd_ptr++; |
| 1220 | port->out_buf_count -= 2; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1221 | tr_data.data = data; |
| 1222 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1223 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
| 1224 | port->out_rd_ptr = port->out_buffer; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1225 | break; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1226 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1227 | case 16: |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1228 | port->out_buf_count -= 2; |
| 1229 | tr_data.data = *(unsigned short *)port->out_rd_ptr; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1230 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1231 | port->out_rd_ptr += 2; |
| 1232 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
| 1233 | port->out_rd_ptr = port->out_buffer; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1234 | break; |
| 1235 | case 24: |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1236 | port->out_buf_count -= 3; |
| 1237 | tr_data.data = *(unsigned short *)port->out_rd_ptr; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1238 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1239 | port->out_rd_ptr += 2; |
| 1240 | tr_data.data = *port->out_rd_ptr++; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1241 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1242 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
| 1243 | port->out_rd_ptr = port->out_buffer; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1244 | break; |
| 1245 | case 32: |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1246 | port->out_buf_count -= 4; |
| 1247 | tr_data.data = *(unsigned short *)port->out_rd_ptr; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1248 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1249 | port->out_rd_ptr += 2; |
| 1250 | tr_data.data = *(unsigned short *)port->out_rd_ptr; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1251 | REG_WR(sser, port->regi_sser, rw_tr_data, tr_data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1252 | port->out_rd_ptr += 2; |
| 1253 | if (port->out_rd_ptr >= port->out_buffer + OUT_BUFFER_SIZE) |
| 1254 | port->out_rd_ptr = port->out_buffer; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1255 | break; |
| 1256 | } |
| 1257 | } |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1258 | #endif |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1259 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1260 | #ifdef SYNC_SER_DMA |
| 1261 | static void start_dma_out(struct sync_port *port, const char *data, int count) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1262 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1263 | port->active_tr_descr->buf = (char *)virt_to_phys((char *)data); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1264 | port->active_tr_descr->after = port->active_tr_descr->buf + count; |
| 1265 | port->active_tr_descr->intr = 1; |
| 1266 | |
| 1267 | port->active_tr_descr->eol = 1; |
| 1268 | port->prev_tr_descr->eol = 0; |
| 1269 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1270 | DEBUGTRDMA(pr_info("Inserting eolr:%p eol@:%p\n", |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1271 | port->prev_tr_descr, port->active_tr_descr)); |
| 1272 | port->prev_tr_descr = port->active_tr_descr; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1273 | port->active_tr_descr = phys_to_virt((int)port->active_tr_descr->next); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1274 | |
| 1275 | if (!port->tr_running) { |
| 1276 | reg_sser_rw_tr_cfg tr_cfg = REG_RD(sser, port->regi_sser, |
| 1277 | rw_tr_cfg); |
| 1278 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1279 | port->out_context.next = NULL; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1280 | port->out_context.saved_data = |
| 1281 | (dma_descr_data *)virt_to_phys(port->prev_tr_descr); |
| 1282 | port->out_context.saved_data_buf = port->prev_tr_descr->buf; |
| 1283 | |
| 1284 | DMA_START_CONTEXT(port->regi_dmaout, |
| 1285 | virt_to_phys((char *)&port->out_context)); |
| 1286 | |
| 1287 | tr_cfg.tr_en = regk_sser_yes; |
| 1288 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); |
Masanari Iida | 10b3097 | 2015-01-27 15:16:31 +0100 | [diff] [blame] | 1289 | DEBUGTRDMA(pr_info("dma s\n");); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1290 | } else { |
| 1291 | DMA_CONTINUE_DATA(port->regi_dmaout); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1292 | DEBUGTRDMA(pr_info("dma c\n");); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1293 | } |
| 1294 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1295 | port->tr_running = 1; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1296 | } |
| 1297 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1298 | static void start_dma_in(struct sync_port *port) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1299 | { |
| 1300 | int i; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1301 | char *buf; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1302 | unsigned long flags; |
| 1303 | spin_lock_irqsave(&port->lock, flags); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1304 | port->writep = port->flip; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1305 | spin_unlock_irqrestore(&port->lock, flags); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1306 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1307 | buf = (char *)virt_to_phys(port->in_buffer); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1308 | for (i = 0; i < NBR_IN_DESCR; i++) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1309 | port->in_descr[i].buf = buf; |
| 1310 | port->in_descr[i].after = buf + port->inbufchunk; |
| 1311 | port->in_descr[i].intr = 1; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1312 | port->in_descr[i].next = |
| 1313 | (dma_descr_data *)virt_to_phys(&port->in_descr[i+1]); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1314 | port->in_descr[i].buf = buf; |
| 1315 | buf += port->inbufchunk; |
| 1316 | } |
| 1317 | /* Link the last descriptor to the first */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1318 | port->in_descr[i-1].next = |
| 1319 | (dma_descr_data *)virt_to_phys(&port->in_descr[0]); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1320 | port->in_descr[i-1].eol = regk_sser_yes; |
| 1321 | port->next_rx_desc = &port->in_descr[0]; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1322 | port->prev_rx_desc = &port->in_descr[NBR_IN_DESCR - 1]; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1323 | port->in_context.saved_data = |
| 1324 | (dma_descr_data *)virt_to_phys(&port->in_descr[0]); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1325 | port->in_context.saved_data_buf = port->in_descr[0].buf; |
| 1326 | DMA_START_CONTEXT(port->regi_dmain, virt_to_phys(&port->in_context)); |
| 1327 | } |
| 1328 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1329 | static irqreturn_t tr_interrupt(int irq, void *dev_id) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1330 | { |
| 1331 | reg_dma_r_masked_intr masked; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1332 | reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1333 | reg_dma_rw_stat stat; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1334 | int i; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1335 | int found = 0; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1336 | int stop_sser = 0; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1337 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1338 | for (i = 0; i < NBR_PORTS; i++) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1339 | struct sync_port *port = &ports[i]; |
| 1340 | if (!port->enabled || !port->use_dma) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1341 | continue; |
| 1342 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1343 | /* IRQ active for the port? */ |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1344 | masked = REG_RD(dma, port->regi_dmaout, r_masked_intr); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1345 | if (!masked.data) |
| 1346 | continue; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1347 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1348 | found = 1; |
| 1349 | |
| 1350 | /* Check if we should stop the DMA transfer */ |
| 1351 | stat = REG_RD(dma, port->regi_dmaout, rw_stat); |
| 1352 | if (stat.list_state == regk_dma_data_at_eol) |
| 1353 | stop_sser = 1; |
| 1354 | |
| 1355 | /* Clear IRQ */ |
| 1356 | REG_WR(dma, port->regi_dmaout, rw_ack_intr, ack_intr); |
| 1357 | |
| 1358 | if (!stop_sser) { |
| 1359 | /* The DMA has completed a descriptor, EOL was not |
| 1360 | * encountered, so step relevant descriptor and |
| 1361 | * datapointers forward. */ |
| 1362 | int sent; |
| 1363 | sent = port->catch_tr_descr->after - |
| 1364 | port->catch_tr_descr->buf; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1365 | DEBUGTXINT(pr_info("%-4d - %-4d = %-4d\t" |
| 1366 | "in descr %p (ac: %p)\n", |
| 1367 | port->out_buf_count, sent, |
| 1368 | port->out_buf_count - sent, |
| 1369 | port->catch_tr_descr, |
| 1370 | port->active_tr_descr);); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1371 | port->out_buf_count -= sent; |
| 1372 | port->catch_tr_descr = |
| 1373 | phys_to_virt((int) port->catch_tr_descr->next); |
| 1374 | port->out_rd_ptr = |
| 1375 | phys_to_virt((int) port->catch_tr_descr->buf); |
| 1376 | } else { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1377 | reg_sser_rw_tr_cfg tr_cfg; |
| 1378 | int j, sent; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1379 | /* EOL handler. |
| 1380 | * Note that if an EOL was encountered during the irq |
| 1381 | * locked section of sync_ser_write the DMA will be |
| 1382 | * restarted and the eol flag will be cleared. |
| 1383 | * The remaining descriptors will be traversed by |
| 1384 | * the descriptor interrupts as usual. |
| 1385 | */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1386 | j = 0; |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1387 | while (!port->catch_tr_descr->eol) { |
| 1388 | sent = port->catch_tr_descr->after - |
| 1389 | port->catch_tr_descr->buf; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1390 | DEBUGOUTBUF(pr_info( |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1391 | "traversing descr %p -%d (%d)\n", |
| 1392 | port->catch_tr_descr, |
| 1393 | sent, |
| 1394 | port->out_buf_count)); |
| 1395 | port->out_buf_count -= sent; |
| 1396 | port->catch_tr_descr = phys_to_virt( |
| 1397 | (int)port->catch_tr_descr->next); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1398 | j++; |
| 1399 | if (j >= NBR_OUT_DESCR) { |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1400 | /* TODO: Reset and recover */ |
| 1401 | panic("sync_serial: missing eol"); |
| 1402 | } |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1403 | } |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1404 | sent = port->catch_tr_descr->after - |
| 1405 | port->catch_tr_descr->buf; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1406 | DEBUGOUTBUF(pr_info("eol at descr %p -%d (%d)\n", |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1407 | port->catch_tr_descr, |
| 1408 | sent, |
| 1409 | port->out_buf_count)); |
| 1410 | |
| 1411 | port->out_buf_count -= sent; |
| 1412 | |
| 1413 | /* Update read pointer to first free byte, we |
| 1414 | * may already be writing data there. */ |
| 1415 | port->out_rd_ptr = |
| 1416 | phys_to_virt((int) port->catch_tr_descr->after); |
| 1417 | if (port->out_rd_ptr > port->out_buffer + |
| 1418 | OUT_BUFFER_SIZE) |
| 1419 | port->out_rd_ptr = port->out_buffer; |
| 1420 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1421 | tr_cfg = REG_RD(sser, port->regi_sser, rw_tr_cfg); |
| 1422 | DEBUGTXINT(pr_info( |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1423 | "tr_int DMA stop %d, set catch @ %p\n", |
| 1424 | port->out_buf_count, |
| 1425 | port->active_tr_descr)); |
| 1426 | if (port->out_buf_count != 0) |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1427 | pr_err("sync_ser: buf not empty after eol\n"); |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1428 | port->catch_tr_descr = port->active_tr_descr; |
| 1429 | port->tr_running = 0; |
| 1430 | tr_cfg.tr_en = regk_sser_no; |
| 1431 | REG_WR(sser, port->regi_sser, rw_tr_cfg, tr_cfg); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1432 | } |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1433 | /* wake up the waiting process */ |
| 1434 | wake_up_interruptible(&port->out_wait_q); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1435 | } |
| 1436 | return IRQ_RETVAL(found); |
| 1437 | } /* tr_interrupt */ |
| 1438 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1439 | |
| 1440 | static inline void handle_rx_packet(struct sync_port *port) |
| 1441 | { |
| 1442 | int idx; |
| 1443 | reg_dma_rw_ack_intr ack_intr = { .data = regk_dma_yes }; |
| 1444 | unsigned long flags; |
| 1445 | |
Masanari Iida | 10b3097 | 2015-01-27 15:16:31 +0100 | [diff] [blame] | 1446 | DEBUGRXINT(pr_info("!")); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1447 | spin_lock_irqsave(&port->lock, flags); |
| 1448 | |
| 1449 | /* If we overrun the user experience is crap regardless if we |
| 1450 | * drop new or old data. Its much easier to get it right when |
| 1451 | * dropping new data so lets do that. |
| 1452 | */ |
| 1453 | if ((port->writep + port->inbufchunk <= |
| 1454 | port->flip + port->in_buffer_size) && |
| 1455 | (port->in_buffer_len + port->inbufchunk < IN_BUFFER_SIZE)) { |
| 1456 | memcpy(port->writep, |
| 1457 | phys_to_virt((unsigned)port->next_rx_desc->buf), |
| 1458 | port->inbufchunk); |
| 1459 | port->writep += port->inbufchunk; |
| 1460 | if (port->writep >= port->flip + port->in_buffer_size) |
| 1461 | port->writep = port->flip; |
| 1462 | |
| 1463 | /* Timestamp the new data chunk. */ |
| 1464 | if (port->write_ts_idx == NBR_IN_DESCR) |
| 1465 | port->write_ts_idx = 0; |
| 1466 | idx = port->write_ts_idx++; |
Thomas Gleixner | 0ec62aa | 2015-07-09 10:51:46 +0200 | [diff] [blame] | 1467 | ktime_get_ts(&port->timestamp[idx]); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1468 | port->in_buffer_len += port->inbufchunk; |
| 1469 | } |
| 1470 | spin_unlock_irqrestore(&port->lock, flags); |
| 1471 | |
| 1472 | port->next_rx_desc->eol = 1; |
| 1473 | port->prev_rx_desc->eol = 0; |
| 1474 | /* Cache bug workaround */ |
| 1475 | flush_dma_descr(port->prev_rx_desc, 0); |
| 1476 | port->prev_rx_desc = port->next_rx_desc; |
| 1477 | port->next_rx_desc = phys_to_virt((unsigned)port->next_rx_desc->next); |
| 1478 | /* Cache bug workaround */ |
| 1479 | flush_dma_descr(port->prev_rx_desc, 1); |
| 1480 | /* wake up the waiting process */ |
| 1481 | wake_up_interruptible(&port->in_wait_q); |
| 1482 | DMA_CONTINUE(port->regi_dmain); |
| 1483 | REG_WR(dma, port->regi_dmain, rw_ack_intr, ack_intr); |
| 1484 | |
| 1485 | } |
| 1486 | |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1487 | static irqreturn_t rx_interrupt(int irq, void *dev_id) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1488 | { |
| 1489 | reg_dma_r_masked_intr masked; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1490 | |
| 1491 | int i; |
| 1492 | int found = 0; |
| 1493 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1494 | DEBUG(pr_info("rx_interrupt\n")); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1495 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1496 | for (i = 0; i < NBR_PORTS; i++) { |
| 1497 | struct sync_port *port = &ports[i]; |
| 1498 | |
| 1499 | if (!port->enabled || !port->use_dma) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1500 | continue; |
| 1501 | |
| 1502 | masked = REG_RD(dma, port->regi_dmain, r_masked_intr); |
| 1503 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1504 | if (!masked.data) |
| 1505 | continue; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1506 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1507 | /* Descriptor interrupt */ |
| 1508 | found = 1; |
| 1509 | while (REG_RD(dma, port->regi_dmain, rw_data) != |
| 1510 | virt_to_phys(port->next_rx_desc)) |
| 1511 | handle_rx_packet(port); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1512 | } |
| 1513 | return IRQ_RETVAL(found); |
| 1514 | } /* rx_interrupt */ |
| 1515 | #endif /* SYNC_SER_DMA */ |
| 1516 | |
| 1517 | #ifdef SYNC_SER_MANUAL |
Jesper Nilsson | e908dfc | 2007-11-29 17:30:24 +0100 | [diff] [blame] | 1518 | static irqreturn_t manual_interrupt(int irq, void *dev_id) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1519 | { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1520 | unsigned long flags; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1521 | int i; |
| 1522 | int found = 0; |
| 1523 | reg_sser_r_masked_intr masked; |
| 1524 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1525 | for (i = 0; i < NBR_PORTS; i++) { |
| 1526 | struct sync_port *port = &ports[i]; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1527 | |
| 1528 | if (!port->enabled || port->use_dma) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1529 | continue; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1530 | |
| 1531 | masked = REG_RD(sser, port->regi_sser, r_masked_intr); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1532 | /* Data received? */ |
| 1533 | if (masked.rdav) { |
| 1534 | reg_sser_rw_rec_cfg rec_cfg = |
| 1535 | REG_RD(sser, port->regi_sser, rw_rec_cfg); |
| 1536 | reg_sser_r_rec_data data = REG_RD(sser, |
| 1537 | port->regi_sser, r_rec_data); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1538 | found = 1; |
| 1539 | /* Read data */ |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1540 | spin_lock_irqsave(&port->lock, flags); |
| 1541 | switch (rec_cfg.sample_size) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1542 | case 8: |
| 1543 | *port->writep++ = data.data & 0xff; |
| 1544 | break; |
| 1545 | case 12: |
| 1546 | *port->writep = (data.data & 0x0ff0) >> 4; |
| 1547 | *(port->writep + 1) = data.data & 0x0f; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1548 | port->writep += 2; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1549 | break; |
| 1550 | case 16: |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1551 | *(unsigned short *)port->writep = data.data; |
| 1552 | port->writep += 2; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1553 | break; |
| 1554 | case 24: |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1555 | *(unsigned int *)port->writep = data.data; |
| 1556 | port->writep += 3; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1557 | break; |
| 1558 | case 32: |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1559 | *(unsigned int *)port->writep = data.data; |
| 1560 | port->writep += 4; |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1561 | break; |
| 1562 | } |
| 1563 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1564 | /* Wrap? */ |
| 1565 | if (port->writep >= port->flip + port->in_buffer_size) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1566 | port->writep = port->flip; |
| 1567 | if (port->writep == port->readp) { |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1568 | /* Receive buf overrun, discard oldest data */ |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1569 | port->readp++; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1570 | /* Wrap? */ |
| 1571 | if (port->readp >= port->flip + |
| 1572 | port->in_buffer_size) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1573 | port->readp = port->flip; |
| 1574 | } |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1575 | spin_unlock_irqrestore(&port->lock, flags); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1576 | if (sync_data_avail(port) >= port->inbufchunk) |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1577 | /* Wake up application */ |
| 1578 | wake_up_interruptible(&port->in_wait_q); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1579 | } |
| 1580 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1581 | /* Transmitter ready? */ |
| 1582 | if (masked.trdy) { |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1583 | found = 1; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1584 | /* More data to send */ |
| 1585 | if (port->out_buf_count > 0) |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1586 | send_word(port); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1587 | else { |
| 1588 | /* Transmission finished */ |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1589 | reg_sser_rw_intr_mask intr_mask; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1590 | intr_mask = REG_RD(sser, port->regi_sser, |
| 1591 | rw_intr_mask); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1592 | intr_mask.trdy = 0; |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1593 | REG_WR(sser, port->regi_sser, |
| 1594 | rw_intr_mask, intr_mask); |
| 1595 | /* Wake up application */ |
| 1596 | wake_up_interruptible(&port->out_wait_q); |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1597 | } |
| 1598 | } |
| 1599 | } |
| 1600 | return IRQ_RETVAL(found); |
| 1601 | } |
| 1602 | #endif |
| 1603 | |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1604 | static int __init etrax_sync_serial_init(void) |
| 1605 | { |
| 1606 | #if 1 |
| 1607 | /* This code will be removed when we move to udev for all devices. */ |
| 1608 | syncser_first = MKDEV(SYNC_SERIAL_MAJOR, 0); |
| 1609 | if (register_chrdev_region(syncser_first, minor_count, SYNCSER_NAME)) { |
| 1610 | pr_err("Failed to register major %d\n", SYNC_SERIAL_MAJOR); |
| 1611 | return -1; |
| 1612 | } |
| 1613 | #else |
| 1614 | /* Allocate dynamic major number. */ |
| 1615 | if (alloc_chrdev_region(&syncser_first, 0, minor_count, SYNCSER_NAME)) { |
| 1616 | pr_err("Failed to allocate character device region\n"); |
| 1617 | return -1; |
| 1618 | } |
| 1619 | #endif |
| 1620 | syncser_cdev = cdev_alloc(); |
| 1621 | if (!syncser_cdev) { |
| 1622 | pr_err("Failed to allocate cdev for syncser\n"); |
| 1623 | unregister_chrdev_region(syncser_first, minor_count); |
| 1624 | return -1; |
| 1625 | } |
| 1626 | cdev_init(syncser_cdev, &syncser_fops); |
| 1627 | |
| 1628 | /* Create a sysfs class for syncser */ |
| 1629 | syncser_class = class_create(THIS_MODULE, "syncser_class"); |
| 1630 | |
| 1631 | /* Initialize Ports */ |
| 1632 | #if defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT0) |
| 1633 | if (artpec_pinmux_alloc_fixed(PINMUX_SSER0)) { |
| 1634 | pr_warn("Unable to alloc pins for synchronous serial port 0\n"); |
| 1635 | unregister_chrdev_region(syncser_first, minor_count); |
| 1636 | return -EIO; |
| 1637 | } |
| 1638 | initialize_port(0); |
| 1639 | ports[0].enabled = 1; |
| 1640 | /* Register with sysfs so udev can pick it up. */ |
| 1641 | device_create(syncser_class, NULL, syncser_first, NULL, |
| 1642 | "%s%d", SYNCSER_NAME, 0); |
| 1643 | #endif |
| 1644 | |
| 1645 | #if defined(CONFIG_ETRAXFS) && defined(CONFIG_ETRAX_SYNCHRONOUS_SERIAL_PORT1) |
| 1646 | if (artpec_pinmux_alloc_fixed(PINMUX_SSER1)) { |
| 1647 | pr_warn("Unable to alloc pins for synchronous serial port 1\n"); |
| 1648 | unregister_chrdev_region(syncser_first, minor_count); |
| 1649 | class_destroy(syncser_class); |
| 1650 | return -EIO; |
| 1651 | } |
| 1652 | initialize_port(1); |
| 1653 | ports[1].enabled = 1; |
| 1654 | /* Register with sysfs so udev can pick it up. */ |
| 1655 | device_create(syncser_class, NULL, syncser_first, NULL, |
| 1656 | "%s%d", SYNCSER_NAME, 0); |
| 1657 | #endif |
| 1658 | |
| 1659 | /* Add it to system */ |
| 1660 | if (cdev_add(syncser_cdev, syncser_first, minor_count) < 0) { |
| 1661 | pr_err("Failed to add syncser as char device\n"); |
| 1662 | device_destroy(syncser_class, syncser_first); |
| 1663 | class_destroy(syncser_class); |
| 1664 | cdev_del(syncser_cdev); |
| 1665 | unregister_chrdev_region(syncser_first, minor_count); |
| 1666 | return -1; |
| 1667 | } |
| 1668 | |
| 1669 | |
| 1670 | pr_info("ARTPEC synchronous serial port (%s: %d, %d)\n", |
| 1671 | SYNCSER_NAME, MAJOR(syncser_first), MINOR(syncser_first)); |
| 1672 | |
| 1673 | return 0; |
| 1674 | } |
| 1675 | |
| 1676 | static void __exit etrax_sync_serial_exit(void) |
| 1677 | { |
| 1678 | int i; |
| 1679 | device_destroy(syncser_class, syncser_first); |
| 1680 | class_destroy(syncser_class); |
| 1681 | |
| 1682 | if (syncser_cdev) { |
| 1683 | cdev_del(syncser_cdev); |
| 1684 | unregister_chrdev_region(syncser_first, minor_count); |
| 1685 | } |
| 1686 | for (i = 0; i < NBR_PORTS; i++) { |
| 1687 | struct sync_port *port = &ports[i]; |
| 1688 | if (port->init_irqs == dma_irq_setup) { |
| 1689 | /* Free dma irqs and dma channels. */ |
| 1690 | #ifdef SYNC_SER_DMA |
| 1691 | artpec_free_dma(port->dma_in_nbr); |
| 1692 | artpec_free_dma(port->dma_out_nbr); |
| 1693 | free_irq(port->dma_out_intr_vect, port); |
| 1694 | free_irq(port->dma_in_intr_vect, port); |
| 1695 | #endif |
| 1696 | } else if (port->init_irqs == manual_irq_setup) { |
| 1697 | /* Free manual irq. */ |
| 1698 | free_irq(port->syncser_intr_vect, port); |
| 1699 | } |
| 1700 | } |
| 1701 | |
| 1702 | pr_info("ARTPEC synchronous serial port unregistered\n"); |
| 1703 | } |
| 1704 | |
Mikael Starvik | 51533b6 | 2005-07-27 11:44:44 -0700 | [diff] [blame] | 1705 | module_init(etrax_sync_serial_init); |
Jesper Nilsson | 3f10462 | 2014-10-07 13:40:08 +0200 | [diff] [blame] | 1706 | module_exit(etrax_sync_serial_exit); |
| 1707 | |
| 1708 | MODULE_LICENSE("GPL"); |
| 1709 | |