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-rw-r--r--drivers/spi/amba-pl022.c90
-rw-r--r--include/linux/amba/pl022.h32
2 files changed, 104 insertions, 18 deletions
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c
index 65092171cec..c75831c1ded 100644
--- a/drivers/spi/amba-pl022.c
+++ b/drivers/spi/amba-pl022.c
@@ -135,6 +135,8 @@
#define SSP_CR1_MASK_MWAIT_ST (0x1UL << 6)
#define SSP_CR1_MASK_RXIFLSEL_ST (0x7UL << 7)
#define SSP_CR1_MASK_TXIFLSEL_ST (0x7UL << 10)
+/* This one is only in the PL023 variant */
+#define SSP_CR1_MASK_FBCLKDEL_ST (0x7UL << 13)
/*
* SSP Status Register - SSP_SR
@@ -317,12 +319,14 @@ enum ssp_writing {
* @unidir: supports unidirection transfers
* @extended_cr: 32 bit wide control register 0 with extra
* features and extra features in CR1 as found in the ST variants
+ * @pl023: supports a subset of the ST extensions called "PL023"
*/
struct vendor_data {
int fifodepth;
int max_bpw;
bool unidir;
bool extended_cr;
+ bool pl023;
};
/**
@@ -541,11 +545,6 @@ static void restore_state(struct pl022 *pl022)
writew(CLEAR_ALL_INTERRUPTS, SSP_ICR(pl022->virtbase));
}
-/**
- * load_ssp_default_config - Load default configuration for SSP
- * @pl022: SSP driver private data structure
- */
-
/*
* Default SSP Register Values
*/
@@ -568,6 +567,14 @@ static void restore_state(struct pl022 *pl022)
GEN_MASK_BITS(SSP_INTERFACE_MOTOROLA_SPI, SSP_CR0_MASK_FRF_ST, 21) \
)
+/* The PL023 version is slightly different again */
+#define DEFAULT_SSP_REG_CR0_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DATA_BITS_12, SSP_CR0_MASK_DSS_ST, 0) | \
+ GEN_MASK_BITS(SSP_CLK_POL_IDLE_LOW, SSP_CR0_MASK_SPO, 6) | \
+ GEN_MASK_BITS(SSP_CLK_SECOND_EDGE, SSP_CR0_MASK_SPH, 7) | \
+ GEN_MASK_BITS(SSP_DEFAULT_CLKRATE, SSP_CR0_MASK_SCR, 8) \
+)
+
#define DEFAULT_SSP_REG_CR1 ( \
GEN_MASK_BITS(LOOPBACK_DISABLED, SSP_CR1_MASK_LBM, 0) | \
GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
@@ -585,6 +592,20 @@ static void restore_state(struct pl022 *pl022)
GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) \
)
+/*
+ * The PL023 variant has further differences: no loopback mode, no microwire
+ * support, and a new clock feedback delay setting.
+ */
+#define DEFAULT_SSP_REG_CR1_ST_PL023 ( \
+ GEN_MASK_BITS(SSP_DISABLED, SSP_CR1_MASK_SSE, 1) | \
+ GEN_MASK_BITS(SSP_MASTER, SSP_CR1_MASK_MS, 2) | \
+ GEN_MASK_BITS(DO_NOT_DRIVE_TX, SSP_CR1_MASK_SOD, 3) | \
+ GEN_MASK_BITS(SSP_RX_MSB, SSP_CR1_MASK_RENDN_ST, 4) | \
+ GEN_MASK_BITS(SSP_TX_MSB, SSP_CR1_MASK_TENDN_ST, 5) | \
+ GEN_MASK_BITS(SSP_RX_1_OR_MORE_ELEM, SSP_CR1_MASK_RXIFLSEL_ST, 7) | \
+ GEN_MASK_BITS(SSP_TX_1_OR_MORE_EMPTY_LOC, SSP_CR1_MASK_TXIFLSEL_ST, 10) | \
+ GEN_MASK_BITS(SSP_FEEDBACK_CLK_DELAY_NONE, SSP_CR1_MASK_FBCLKDEL_ST, 13) \
+)
#define DEFAULT_SSP_REG_CPSR ( \
GEN_MASK_BITS(SSP_DEFAULT_PRESCALE, SSP_CPSR_MASK_CPSDVSR, 0) \
@@ -595,10 +616,16 @@ static void restore_state(struct pl022 *pl022)
GEN_MASK_BITS(SSP_DMA_DISABLED, SSP_DMACR_MASK_TXDMAE, 1) \
)
-
+/**
+ * load_ssp_default_config - Load default configuration for SSP
+ * @pl022: SSP driver private data structure
+ */
static void load_ssp_default_config(struct pl022 *pl022)
{
- if (pl022->vendor->extended_cr) {
+ if (pl022->vendor->pl023) {
+ writel(DEFAULT_SSP_REG_CR0_ST_PL023, SSP_CR0(pl022->virtbase));
+ writew(DEFAULT_SSP_REG_CR1_ST_PL023, SSP_CR1(pl022->virtbase));
+ } else if (pl022->vendor->extended_cr) {
writel(DEFAULT_SSP_REG_CR0_ST, SSP_CR0(pl022->virtbase));
writew(DEFAULT_SSP_REG_CR1_ST, SSP_CR1(pl022->virtbase));
} else {
@@ -1629,20 +1656,27 @@ static int pl022_setup(struct spi_device *spi)
/* Special setup for the ST micro extended control registers */
if (pl022->vendor->extended_cr) {
+ if (pl022->vendor->pl023) {
+ /* These bits are only in the PL023 */
+ SSP_WRITE_BITS(chip->cr1, chip_info->clkdelay,
+ SSP_CR1_MASK_FBCLKDEL_ST, 13);
+ } else {
+ /* These bits are in the PL022 but not PL023 */
+ SSP_WRITE_BITS(chip->cr0, chip_info->duplex,
+ SSP_CR0_MASK_HALFDUP_ST, 5);
+ SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len,
+ SSP_CR0_MASK_CSS_ST, 16);
+ SSP_WRITE_BITS(chip->cr0, chip_info->iface,
+ SSP_CR0_MASK_FRF_ST, 21);
+ SSP_WRITE_BITS(chip->cr1, chip_info->wait_state,
+ SSP_CR1_MASK_MWAIT_ST, 6);
+ }
SSP_WRITE_BITS(chip->cr0, chip_info->data_size,
SSP_CR0_MASK_DSS_ST, 0);
- SSP_WRITE_BITS(chip->cr0, chip_info->duplex,
- SSP_CR0_MASK_HALFDUP_ST, 5);
- SSP_WRITE_BITS(chip->cr0, chip_info->ctrl_len,
- SSP_CR0_MASK_CSS_ST, 16);
- SSP_WRITE_BITS(chip->cr0, chip_info->iface,
- SSP_CR0_MASK_FRF_ST, 21);
SSP_WRITE_BITS(chip->cr1, chip_info->endian_rx,
SSP_CR1_MASK_RENDN_ST, 4);
SSP_WRITE_BITS(chip->cr1, chip_info->endian_tx,
SSP_CR1_MASK_TENDN_ST, 5);
- SSP_WRITE_BITS(chip->cr1, chip_info->wait_state,
- SSP_CR1_MASK_MWAIT_ST, 6);
SSP_WRITE_BITS(chip->cr1, chip_info->rx_lev_trig,
SSP_CR1_MASK_RXIFLSEL_ST, 7);
SSP_WRITE_BITS(chip->cr1, chip_info->tx_lev_trig,
@@ -1657,7 +1691,9 @@ static int pl022_setup(struct spi_device *spi)
SSP_WRITE_BITS(chip->cr0, chip_info->clk_pol, SSP_CR0_MASK_SPO, 6);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_phase, SSP_CR0_MASK_SPH, 7);
SSP_WRITE_BITS(chip->cr0, chip_info->clk_freq.scr, SSP_CR0_MASK_SCR, 8);
- SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
+ /* Loopback is available on all versions except PL023 */
+ if (!pl022->vendor->pl023)
+ SSP_WRITE_BITS(chip->cr1, chip_info->lbm, SSP_CR1_MASK_LBM, 0);
SSP_WRITE_BITS(chip->cr1, SSP_DISABLED, SSP_CR1_MASK_SSE, 1);
SSP_WRITE_BITS(chip->cr1, chip_info->hierarchy, SSP_CR1_MASK_MS, 2);
SSP_WRITE_BITS(chip->cr1, chip_info->slave_tx_disable, SSP_CR1_MASK_SOD, 3);
@@ -1874,6 +1910,7 @@ static struct vendor_data vendor_arm = {
.max_bpw = 16,
.unidir = false,
.extended_cr = false,
+ .pl023 = false,
};
@@ -1882,6 +1919,15 @@ static struct vendor_data vendor_st = {
.max_bpw = 32,
.unidir = false,
.extended_cr = true,
+ .pl023 = false,
+};
+
+static struct vendor_data vendor_st_pl023 = {
+ .fifodepth = 32,
+ .max_bpw = 32,
+ .unidir = false,
+ .extended_cr = true,
+ .pl023 = true,
};
static struct amba_id pl022_ids[] = {
@@ -1903,6 +1949,18 @@ static struct amba_id pl022_ids[] = {
.mask = 0xffffffff,
.data = &vendor_st,
},
+ {
+ /*
+ * ST-Ericsson derivative "PL023" (this is not
+ * an official ARM number), this is a PL022 SSP block
+ * stripped to SPI mode only, it has 32bit wide
+ * and 32 locations deep TX/RX FIFO but no extended
+ * CR0/CR1 register
+ */
+ .id = 0x00080023,
+ .mask = 0xffffffff,
+ .data = &vendor_st_pl023,
+ },
{ 0, 0 },
};
diff --git a/include/linux/amba/pl022.h b/include/linux/amba/pl022.h
index 612f3991334..abf26cc47a2 100644
--- a/include/linux/amba/pl022.h
+++ b/include/linux/amba/pl022.h
@@ -182,8 +182,8 @@ enum ssp_microwire_wait_state {
};
/**
- * enum Microwire - whether Full/Half Duplex, only available
- * in the ST Micro variant.
+ * enum ssp_duplex - whether Full/Half Duplex on microwire, only
+ * available in the ST Micro variant.
* @SSP_MICROWIRE_CHANNEL_FULL_DUPLEX: SSPTXD becomes bi-directional,
* SSPRXD not used
* @SSP_MICROWIRE_CHANNEL_HALF_DUPLEX: SSPTXD is an output, SSPRXD is
@@ -195,6 +195,31 @@ enum ssp_duplex {
};
/**
+ * enum ssp_clkdelay - an optional clock delay on the feedback clock
+ * only available in the ST Micro PL023 variant.
+ * @SSP_FEEDBACK_CLK_DELAY_NONE: no delay, the data coming in from the
+ * slave is sampled directly
+ * @SSP_FEEDBACK_CLK_DELAY_1T: the incoming slave data is sampled with
+ * a delay of T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_2T: dito with a delay if 2T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_3T: dito with a delay if 3T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_4T: dito with a delay if 4T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_5T: dito with a delay if 5T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_6T: dito with a delay if 6T-dt
+ * @SSP_FEEDBACK_CLK_DELAY_7T: dito with a delay if 7T-dt
+ */
+enum ssp_clkdelay {
+ SSP_FEEDBACK_CLK_DELAY_NONE,
+ SSP_FEEDBACK_CLK_DELAY_1T,
+ SSP_FEEDBACK_CLK_DELAY_2T,
+ SSP_FEEDBACK_CLK_DELAY_3T,
+ SSP_FEEDBACK_CLK_DELAY_4T,
+ SSP_FEEDBACK_CLK_DELAY_5T,
+ SSP_FEEDBACK_CLK_DELAY_6T,
+ SSP_FEEDBACK_CLK_DELAY_7T
+};
+
+/**
* CHIP select/deselect commands
*/
enum ssp_chip_select {
@@ -237,6 +262,8 @@ struct pl022_ssp_controller {
* @ctrl_len: Microwire interface: Control length
* @wait_state: Microwire interface: Wait state
* @duplex: Microwire interface: Full/Half duplex
+ * @clkdelay: on the PL023 variant, the delay in feeback clock cycles
+ * before sampling the incoming line
* @cs_control: function pointer to board-specific function to
* assert/deassert I/O port to control HW generation of devices chip-select.
* @dma_xfer_type: Type of DMA xfer (Mem-to-periph or Periph-to-Periph)
@@ -260,6 +287,7 @@ struct pl022_config_chip {
enum ssp_microwire_ctrl_len ctrl_len;
enum ssp_microwire_wait_state wait_state;
enum ssp_duplex duplex;
+ enum ssp_clkdelay clkdelay;
void (*cs_control) (u32 control);
};
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-13 08:00:05 +0000