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drivers: bluetooth: hci: Restructure spi.c to handle different protocols

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Update structure of spi.c to have a better and cleaner separation
between STMicroelectronics and Zephyr SPI protocol.

Introduce bt_spi_get_header to separate algorithms well for
header acquisition in different protocols.

Remove header acquisition from bt_spi_rx_thread to make it simpler.

Signed-off-by: Ali Hozhabri <ali.hozhabri@st.com>
This commit is contained in:
Ali Hozhabri 2023-11-21 10:23:10 +01:00 committed by Fabio Baltieri
parent d9c4ce7255
commit 36b0e26e64
1 changed files with 78 additions and 57 deletions
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135
drivers/bluetooth/hci/spi.c
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@ -85,14 +85,6 @@ static K_SEM_DEFINE(sem_busy, 1, 1);
static K_KERNEL_STACK_DEFINE(spi_rx_stack, CONFIG_BT_DRV_RX_STACK_SIZE);
static struct k_thread spi_rx_thread_data;
#if defined(CONFIG_BT_SPI_BLUENRG)
/* Define a limit when reading IRQ high */
/* It can be required to be increased for */
/* some particular cases. */
#define IRQ_HIGH_MAX_READ 3
static uint8_t attempts;
#endif /* CONFIG_BT_SPI_BLUENRG */
#if defined(CONFIG_BT_BLUENRG_ACI)
#define BLUENRG_ACI_WRITE_CONFIG_DATA BT_OP(BT_OGF_VS, 0x000C)
#define BLUENRG_CONFIG_PUBADDR_OFFSET 0x00
@ -167,16 +159,18 @@ static bool bt_spi_handle_vendor_evt(uint8_t *msg)
return handled;
}
#define IS_IRQ_HIGH gpio_pin_get_dt(&irq_gpio)
#if defined(CONFIG_BT_SPI_BLUENRG)
/* BlueNRG has a particuliar way to wake up from sleep and be ready.
* All is done through its CS line:
* If it is in sleep mode, the first transaction will not return ready
* status. At this point, it's necessary to release the CS and retry
* within 2ms the same transaction. And again when it's required to
* know the amount of byte to read.
* (See section 5.2 of BlueNRG-MS datasheet)
*/
static void kick_cs(void)
/* Define a limit when reading IRQ high */
/* It can be required to be increased for */
/* some particular cases. */
#define IRQ_HIGH_MAX_READ 3
/* On BlueNRG-MS, host is expected to read */
/* as long as IRQ pin is high */
#define READ_CONDITION IS_IRQ_HIGH
static void assert_cs(void)
{
gpio_pin_set_dt(&bus.config.cs.gpio, 0);
gpio_pin_set_dt(&bus.config.cs.gpio, 1);
@ -187,40 +181,79 @@ static void release_cs(void)
gpio_pin_set_dt(&bus.config.cs.gpio, 0);
}
static bool irq_pin_high(void)
static int bt_spi_get_header(uint8_t op, uint8_t *size)
{
int pin_state;
uint8_t header_master[5] = {op, 0, 0, 0, 0};
uint8_t header_slave[5];
uint8_t size_offset, attempts;
int ret;
pin_state = gpio_pin_get_dt(&irq_gpio);
LOG_DBG("IRQ Pin: %d", pin_state);
return pin_state > 0;
}
static void init_irq_high_loop(void)
{
if (op == SPI_READ) {
if (!IS_IRQ_HIGH) {
*size = 0;
return 0;
}
size_offset = STATUS_HEADER_TOREAD;
}
attempts = IRQ_HIGH_MAX_READ;
do {
if (op == SPI_READ) {
/* Keep checking that IRQ is still high, if we need to read */
if (!IS_IRQ_HIGH) {
*size = 0;
return 0;
}
}
assert_cs();
ret = bt_spi_transceive(header_master, 5, header_slave, 5);
if (ret) {
/* SPI transaction failed */
break;
}
*size = (header_slave[STATUS_HEADER_READY] == READY_NOW) ?
header_slave[size_offset] : 0;
attempts--;
} while ((*size == 0) && attempts);
return ret;
}
static bool exit_irq_high_loop(void)
{
/* Limit attempts on BlueNRG-MS as we might */
/* enter this loop with nothing to read */
attempts--;
return attempts;
}
/* Other Boards */
#else
#define kick_cs(...)
#define release_cs(...)
#define irq_pin_high(...) 0
#define init_irq_high_loop(...)
#define exit_irq_high_loop(...) 1
#define READ_CONDITION false
static int bt_spi_get_header(uint8_t op, uint8_t *size)
{
uint8_t header_master[5] = {op, 0, 0, 0, 0};
uint8_t header_slave[5];
bool reading = (op == SPI_READ);
bool loop_cond;
uint8_t size_offset;
int ret;
if (reading) {
size_offset = STATUS_HEADER_TOREAD;
}
do {
ret = bt_spi_transceive(header_master, 5, header_slave, 5);
if (ret) {
break;
}
if (reading) {
/* When reading, keep looping if read buffer is not valid */
loop_cond = ((header_slave[STATUS_HEADER_TOREAD] == 0U) ||
(header_slave[STATUS_HEADER_TOREAD] == 0xFF));
}
} while ((header_slave[STATUS_HEADER_READY] != READY_NOW) || loop_cond);
*size = (reading ? header_slave[size_offset] : SPI_MAX_MSG_LEN);
return ret;
}
#endif /* CONFIG_BT_SPI_BLUENRG */
#if defined(CONFIG_BT_BLUENRG_ACI)
@ -328,8 +361,6 @@ static void bt_spi_rx_thread(void *p1, void *p2, void *p3)
ARG_UNUSED(p2);
ARG_UNUSED(p3);
uint8_t header_master[5] = { SPI_READ, 0x00, 0x00, 0x00, 0x00 };
uint8_t header_slave[5];
struct net_buf *buf;
uint8_t size = 0U;
int ret;
@ -345,18 +376,11 @@ static void bt_spi_rx_thread(void *p1, void *p2, void *p3)
do {
/* Wait for SPI bus to be available */
k_sem_take(&sem_busy, K_FOREVER);
init_irq_high_loop();
do {
kick_cs();
ret = bt_spi_transceive(header_master, 5,
header_slave, 5);
} while ((((header_slave[STATUS_HEADER_TOREAD] == 0U ||
header_slave[STATUS_HEADER_TOREAD] == 0xFF) &&
!ret)) && exit_irq_high_loop());
ret = bt_spi_get_header(SPI_READ, &size);
/* Delay here is rounded up to next tick */
k_sleep(K_USEC(DATA_DELAY_US));
size = header_slave[STATUS_HEADER_TOREAD];
/* Read data */
if (ret == 0 && size != 0) {
do {
ret = bt_spi_transceive(&txmsg, size,
@ -390,10 +414,7 @@ static void bt_spi_rx_thread(void *p1, void *p2, void *p3)
/* Handle the received HCI data */
bt_recv(buf);
}
/* On BlueNRG-MS, host is expected to read */
/* as long as IRQ pin is high */
} while (irq_pin_high());
} while (READ_CONDITION);
}
}