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authorFurquan Shaikh <furquan@chromium.org>2016-12-01 01:02:44 -0800
committerFurquan Shaikh <furquan@google.com>2016-12-05 03:28:06 +0100
commit36b81af9e8ecea2bf58aae9a421720ed10f61b82 (patch)
tree05e7329c67bf009531c12052db105ac55ce015b8 /src/soc/imgtec/pistachio
parent0dba0254ea31eca41fdef88783f1dd192ac6fa56 (diff)
spi: Pass pointer to spi_slave structure in spi_setup_slave
For spi_setup_slave, instead of making the platform driver return a pointer to spi_slave structure, pass in a structure pointer that can be filled in by the driver as required. This removes the need for platform drivers to maintain a slave structure in data/CAR section. BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully Change-Id: Ia15a4f88ef4dcfdf616bb1c22261e7cb642a7573 Signed-off-by: Furquan Shaikh <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/17683 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/soc/imgtec/pistachio')
-rw-r--r--src/soc/imgtec/pistachio/spi.c46
1 files changed, 27 insertions, 19 deletions
diff --git a/src/soc/imgtec/pistachio/spi.c b/src/soc/imgtec/pistachio/spi.c
index 307aec9ec8..86c452a55a 100644
--- a/src/soc/imgtec/pistachio/spi.c
+++ b/src/soc/imgtec/pistachio/spi.c
@@ -30,7 +30,6 @@
#define IMGTEC_SPI_MAX_TRANSFER_SIZE ((1 << 16) - 1)
struct img_spi_slave {
- struct spi_slave slave;
/* SPIM instance device parameters */
struct spim_device_parameters device_parameters;
/* SPIM instance base address */
@@ -59,13 +58,20 @@ static int wait_status(u32 reg, u32 shift)
return SPIM_OK;
}
+static struct img_spi_slave *get_img_slave(const struct spi_slave *slave)
+{
+ return img_spi_slaves + slave->bus * SPIM_NUM_PORTS_PER_BLOCK +
+ slave->cs;
+}
+
/* Transmitter function. Fills TX FIFO with data before enabling SPIM */
static int transmitdata(const struct spi_slave *slave, u8 *buffer, u32 size)
{
u32 blocksize, base, write_data;
int ret;
+ struct img_spi_slave *img_slave = get_img_slave(slave);
- base = container_of(slave, struct img_spi_slave, slave)->base;
+ base = img_slave->base;
while (size) {
/* Wait until FIFO empty */
write32(base + SPFI_INT_CLEAR_REG_OFFSET, SPFI_SDE_MASK);
@@ -101,8 +107,9 @@ static int receivedata(const struct spi_slave *slave, u8 *buffer, u32 size)
{
u32 read_data, base;
int ret;
+ struct img_spi_slave *img_slave = get_img_slave(slave);
- base = container_of(slave, struct img_spi_slave, slave)->base;
+ base = img_slave->base;
/*
* Do 32bit reads first. Clear status GDEX32BIT here so that the first
* status reg. read gets the actual bit state
@@ -145,10 +152,10 @@ static void setparams(const struct spi_slave *slave, u32 port,
struct spim_device_parameters *params)
{
u32 spim_parameters, port_state, base;
+ struct img_spi_slave *img_slave = get_img_slave(slave);
+ base = img_slave->base;
spim_parameters = 0;
-
- base = container_of(slave, struct img_spi_slave, slave)->base;
port_state = read32(base + SPFI_PORT_STATE_REG_OFFSET);
port_state &= ~((SPIM_PORT0_MASK>>port)|SPFI_PORT_SELECT_MASK);
port_state |= params->cs_idle_level<<(SPIM_CS0_IDLE_SHIFT-port);
@@ -250,7 +257,9 @@ static u32 control_reg_setup(struct spim_buffer *first,
static int check_buffers(const struct spi_slave *slave, struct spim_buffer *first,
struct spim_buffer *second){
- if (!(container_of(slave, struct img_spi_slave, slave)->initialised))
+ struct img_spi_slave *img_slave = get_img_slave(slave);
+
+ if (!(img_slave->initialised))
return -SPIM_API_NOT_INITIALISED;
/*
* First operation must always be defined
@@ -331,8 +340,9 @@ static int spim_io(const struct spi_slave *slave, struct spim_buffer *first,
u32 reg, base;
int i, trans_count, ret;
struct spim_buffer *transaction[2];
+ struct img_spi_slave *img_slave = get_img_slave(slave);
- base = container_of(slave, struct img_spi_slave, slave)->base;
+ base = img_slave->base;
ret = check_buffers(slave, first, second);
if (ret)
@@ -412,11 +422,9 @@ void spi_init(void)
}
/* Set up communications parameters for a SPI slave. */
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+int spi_setup_slave(unsigned int bus, unsigned int cs, struct spi_slave *slave)
{
-
struct img_spi_slave *img_slave = NULL;
- struct spi_slave *slave;
struct spim_device_parameters *device_parameters;
u32 base;
@@ -430,21 +438,21 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
default:
printk(BIOS_ERR, "%s: Error: unsupported bus.\n",
__func__);
- return NULL;
+ return -1;
}
if (cs > SPIM_DEVICE4) {
printk(BIOS_ERR, "%s: Error: unsupported chipselect.\n",
__func__);
- return NULL;
+ return -1;
}
- img_slave = img_spi_slaves + bus * SPIM_NUM_PORTS_PER_BLOCK + cs;
- slave = &(img_slave->slave);
+ slave->bus = bus;
+ slave->cs = cs;
+
+ img_slave = get_img_slave(slave);
device_parameters = &(img_slave->device_parameters);
img_slave->base = base;
- slave->bus = bus;
- slave->cs = cs;
device_parameters->bitrate = 64;
device_parameters->cs_setup = 0;
@@ -455,7 +463,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
device_parameters->data_idle_level = 0;
img_slave->initialised = IMG_FALSE;
- return slave;
+ return 0;
}
/* Claim the bus and prepare it for communication */
@@ -469,7 +477,7 @@ int spi_claim_bus(const struct spi_slave *slave)
__func__);
return -SPIM_API_NOT_INITIALISED;
}
- img_slave = container_of(slave, struct img_spi_slave, slave);
+ img_slave = get_img_slave(slave);
if (img_slave->initialised)
return SPIM_OK;
/* Check device parameters */
@@ -499,7 +507,7 @@ void spi_release_bus(const struct spi_slave *slave)
__func__);
return;
}
- img_slave = container_of(slave, struct img_spi_slave, slave);
+ img_slave = get_img_slave(slave);
img_slave->initialised = IMG_FALSE;
/* Soft reset peripheral internals */
write32(img_slave->base + SPFI_CONTROL_REG_OFFSET,