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Message-ID: <1411981378.11022.1.camel@linux.intel.com>
Date: Mon, 29 Sep 2014 12:02:58 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Weike Chen <alvin.chen@...el.com>
Cc: Eric Miao <eric.y.miao@...il.com>,
Russell King <linux@....linux.org.uk>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Mark Brown <broonie@...nel.org>,
linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org,
Mika Westerberg <mika.westerberg@...el.com>,
Hock Leong Kweh <hock.leong.kweh@...el.com>,
Boon Leong Ong <boon.leong.ong@...el.com>,
Raymond Tan <raymond.tan@...el.com>
Subject: Re: [PATCH 2/2 v2] SPI: spi-pxa2xx: SPI support for Intel Quark
X1000
On Mon, 2014-09-29 at 07:22 -0700, Weike Chen wrote:
> There are two SPI controllers exported by PCI subsystem for Intel Quark X1000.
> The SPI memory mapped I/O registers supported by Quark are different from
> the current implementation, and Quark only supports the registers of 'SSCR0',
> 'SSCR1', 'SSSR', 'SSDR', and 'DDS_RATE'. This patch is to enable the SPI for
> Intel Quark X1000.
>
> This piece of work is derived from Dan O'Donovan's initial work for Intel Quark
> X1000 SPI enabling.
Minor comments are below.
After addressing them
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>
> Signed-off-by: Weike Chen <alvin.chen@...el.com>
> ---
> drivers/spi/spi-pxa2xx-pci.c | 8 ++
> drivers/spi/spi-pxa2xx.c | 204 +++++++++++++++++++++++++++++++++++++-----
> drivers/spi/spi-pxa2xx.h | 16 ++--
> include/linux/pxa2xx_ssp.h | 21 +++++
> 4 files changed, 224 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
> index b285294..b888aeb 100644
> --- a/drivers/spi/spi-pxa2xx-pci.c
> +++ b/drivers/spi/spi-pxa2xx-pci.c
> @@ -19,6 +19,7 @@ enum {
> PORT_BSW0,
> PORT_BSW1,
> PORT_BSW2,
> + PORT_QUARK_X1000,
> };
>
> struct pxa_spi_info {
> @@ -92,6 +93,12 @@ static struct pxa_spi_info spi_info_configs[] = {
> .tx_param = &bsw2_tx_param,
> .rx_param = &bsw2_rx_param,
> },
> + [PORT_QUARK_X1000] = {
> + .type = QUARK_X1000_SSP,
> + .port_id = -1,
> + .num_chipselect = 4,
> + .max_clk_rate = 50000000,
> + },
> };
>
> static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
> @@ -192,6 +199,7 @@ static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
>
> static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
> { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
> + { PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
> { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
> { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
> { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
> diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
> index e7ff9c5..7efa55e 100644
> --- a/drivers/spi/spi-pxa2xx.c
> +++ b/drivers/spi/spi-pxa2xx.c
> @@ -63,10 +63,64 @@ MODULE_ALIAS("platform:pxa2xx-spi");
> | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
> | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
>
> +#define QUARK_X1000_SSCR1_CHANGE_MASK (QUARK_X1000_SSCR1_STRF \
> + | QUARK_X1000_SSCR1_EFWR \
> + | QUARK_X1000_SSCR1_RFT \
> + | QUARK_X1000_SSCR1_TFT \
> + | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
> +
> #define LPSS_RX_THRESH_DFLT 64
> #define LPSS_TX_LOTHRESH_DFLT 160
> #define LPSS_TX_HITHRESH_DFLT 224
>
> +struct quark_spi_rate {
> + u32 bitrate;
> + u32 dds_clk_rate;
> + u32 clk_div;
> +};
> +
> +/*
> + * 'rate', 'dds', 'clk_div' lookup table, which is defined in
> + * the Quark SPI datasheet.
> + */
> +static const struct quark_spi_rate quark_spi_rate_table[] = {
> +/* bitrate, dds_clk_rate, clk_div */
> + {50000000, 0x800000, 0},
> + {40000000, 0x666666, 0},
> + {25000000, 0x400000, 0},
> + {20000000, 0x666666, 1},
> + {16667000, 0x800000, 2},
> + {13333000, 0x666666, 2},
> + {12500000, 0x200000, 0},
> + {10000000, 0x800000, 4},
> + {8000000, 0x666666, 4},
> + {6250000, 0x400000, 3},
> + {5000000, 0x400000, 4},
> + {4000000, 0x666666, 9},
> + {3125000, 0x80000, 0},
> + {2500000, 0x400000, 9},
> + {2000000, 0x666666, 19},
> + {1563000, 0x40000, 0},
> + {1250000, 0x200000, 9},
> + {1000000, 0x400000, 24},
> + {800000, 0x666666, 49},
> + {781250, 0x20000, 0},
> + {625000, 0x200000, 19},
> + {500000, 0x400000, 49},
> + {400000, 0x666666, 99},
> + {390625, 0x10000, 0},
> + {250000, 0x400000, 99},
> + {200000, 0x666666, 199},
> + {195313, 0x8000, 0},
> + {125000, 0x100000, 49},
> + {100000, 0x200000, 124},
> + {50000, 0x100000, 124},
> + {25000, 0x80000, 124},
> + {10016, 0x20000, 77},
> + {5040, 0x20000, 154},
> + {1002, 0x8000, 194},
> +};
> +
Regarding to table vs. formula I will agree with whatever Mark suggested.
> /* Offset from drv_data->lpss_base */
> #define GENERAL_REG 0x08
> #define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
> @@ -80,9 +134,16 @@ static bool is_lpss_ssp(const struct driver_data *drv_data)
> return drv_data->ssp_type == LPSS_SSP;
> }
>
> +static bool is_quark_x1000_ssp(const struct driver_data *drv_data)
> +{
> + return drv_data->ssp_type == QUARK_X1000_SSP;
> +}
> +
> static u32 pxa2xx_spi_get_ssrc1_change_mask(const struct driver_data *drv_data)
> {
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + return QUARK_X1000_SSCR1_CHANGE_MASK;
> default:
> return SSCR1_CHANGE_MASK;
> }
> @@ -92,9 +153,12 @@ static u32
> pxa2xx_spi_get_rx_default_thre(const struct driver_data *drv_data)
> {
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + return RX_THRESH_QUARK_X1000_DFLT;
> default:
> return RX_THRESH_DFLT;
> }
> +
Redundant empty line.
> }
>
> static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
> @@ -103,6 +167,9 @@ static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
> u32 mask;
>
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + mask = QUARK_X1000_SSSR_TFL_MASK;
> + break;
> default:
> mask = SSSR_TFL_MASK;
> break;
> @@ -112,11 +179,14 @@ static bool pxa2xx_spi_txfifo_full(const struct driver_data *drv_data)
> }
>
> static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
> - u32 *sccr1_reg)
> + u32 *sccr1_reg)
Unnecessary change.
> {
> u32 mask;
>
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + mask = QUARK_X1000_SSCR1_RFT;
> + break;
> default:
> mask = SSCR1_RFT;
> break;
> @@ -125,9 +195,12 @@ static void pxa2xx_spi_clear_rx_thre(const struct driver_data *drv_data,
> }
>
> static void pxa2xx_spi_set_rx_thre(const struct driver_data *drv_data,
> - u32 *sccr1_reg, u32 threshold)
> + u32 *sccr1_reg, u32 threshold)
Ditto.
Or you may do that in the first patch.
> {
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + *sccr1_reg |= QUARK_X1000_SSCR1_RxTresh(threshold);
> + break;
> default:
> *sccr1_reg |= SSCR1_RxTresh(threshold);
> break;
> @@ -138,6 +211,11 @@ static u32 pxa2xx_configure_sscr0(const struct driver_data *drv_data,
> u32 clk_div, u8 bits)
> {
> switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + return clk_div
> + | QUARK_X1000_SSCR0_Motorola
> + | QUARK_X1000_SSCR0_DataSize(bits > 32 ? 8 : bits)
> + | SSCR0_SSE;
> default:
> return clk_div
> | SSCR0_Motorola
> @@ -592,7 +670,7 @@ static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
> rx_thre = bytes_left;
>
> pxa2xx_spi_set_rx_thre(drv_data, &sccr1_reg,
> - rx_thre);
> + rx_thre);
Ditto.
> }
> write_SSCR1(sccr1_reg, reg);
> }
> @@ -655,6 +733,28 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
> return drv_data->transfer_handler(drv_data);
> }
>
> +/*
> + * The Quark SPI data sheet gives a table, and for the given 'rate',
> + * the 'dds' and 'clk_div' can be found in the table.
> + */
> +static u32 quark_x1000_set_clk_regvals(u32 rate, u32 *dds, u32 *clk_div)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < ARRAY_SIZE(quark_spi_rate_table); i++) {
> + if (rate >= quark_spi_rate_table[i].bitrate) {
> + *dds = quark_spi_rate_table[i].dds_clk_rate;
> + *clk_div = quark_spi_rate_table[i].clk_div;
> + return quark_spi_rate_table[i].bitrate;
> + }
> + }
> +
> + *dds = quark_spi_rate_table[i-1].dds_clk_rate;
> + *clk_div = quark_spi_rate_table[i-1].clk_div;
> +
> + return quark_spi_rate_table[i-1].bitrate;
> +}
> +
> static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
> {
> unsigned long ssp_clk = drv_data->max_clk_rate;
> @@ -668,6 +768,20 @@ static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
> return ((ssp_clk / rate - 1) & 0xfff) << 8;
> }
>
> +static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
> + struct chip_data *chip, int rate)
> +{
> + u32 clk_div;
> +
> + switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + quark_x1000_set_clk_regvals(rate, &chip->dds_rate, &clk_div);
> + return clk_div << 8;
> + default:
> + return ssp_get_clk_div(drv_data, rate);
> + }
> +}
> +
> static void pump_transfers(unsigned long data)
> {
> struct driver_data *drv_data = (struct driver_data *)data;
> @@ -770,7 +884,7 @@ static void pump_transfers(unsigned long data)
> if (transfer->bits_per_word)
> bits = transfer->bits_per_word;
>
> - clk_div = ssp_get_clk_div(drv_data, speed);
> + clk_div = pxa2xx_ssp_get_clk_div(drv_data, chip, speed);
>
> if (bits <= 8) {
> drv_data->n_bytes = 1;
> @@ -838,6 +952,10 @@ static void pump_transfers(unsigned long data)
> write_SSITF(chip->lpss_tx_threshold, reg);
> }
>
> + if (is_quark_x1000_ssp(drv_data) &&
> + (read_DDS_RATE(reg) != chip->dds_rate))
Could it be one line?
> + write_DDS_RATE(chip->dds_rate, reg);
> +
> /* see if we need to reload the config registers */
> if ((read_SSCR0(reg) != cr0) ||
> (read_SSCR1(reg) & change_mask) != (cr1 & change_mask)) {
> @@ -941,14 +1059,22 @@ static int setup(struct spi_device *spi)
> unsigned int clk_div;
> uint tx_thres, tx_hi_thres, rx_thres;
>
> - if (is_lpss_ssp(drv_data)) {
> + switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + tx_thres = TX_THRESH_QUARK_X1000_DFLT;
> + tx_hi_thres = 0;
> + rx_thres = RX_THRESH_QUARK_X1000_DFLT;
> + break;
> + case LPSS_SSP:
> tx_thres = LPSS_TX_LOTHRESH_DFLT;
> tx_hi_thres = LPSS_TX_HITHRESH_DFLT;
> rx_thres = LPSS_RX_THRESH_DFLT;
> - } else {
> + break;
> + default:
> tx_thres = TX_THRESH_DFLT;
> tx_hi_thres = 0;
> rx_thres = RX_THRESH_DFLT;
> + break;
> }
>
> /* Only alloc on first setup */
> @@ -1001,9 +1127,6 @@ static int setup(struct spi_device *spi)
> chip->enable_dma = drv_data->master_info->enable_dma;
> }
>
> - chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
> - (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
> -
> chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
> chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
> | SSITF_TxHiThresh(tx_hi_thres);
> @@ -1022,11 +1145,24 @@ static int setup(struct spi_device *spi)
> }
> }
>
> - clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz);
> + clk_div = pxa2xx_ssp_get_clk_div(drv_data, chip, spi->max_speed_hz);
> chip->speed_hz = spi->max_speed_hz;
>
> chip->cr0 = pxa2xx_configure_sscr0(drv_data, clk_div,
> spi->bits_per_word);
> + switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + chip->threshold = (QUARK_X1000_SSCR1_RxTresh(rx_thres)
> + & QUARK_X1000_SSCR1_RFT)
> + | (QUARK_X1000_SSCR1_TxTresh(tx_thres)
> + & QUARK_X1000_SSCR1_TFT);
> + break;
> + default:
> + chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
> + (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
> + break;
> + }
> +
> chip->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
> chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
> | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
> @@ -1055,7 +1191,8 @@ static int setup(struct spi_device *spi)
> chip->read = u16_reader;
> chip->write = u16_writer;
> } else if (spi->bits_per_word <= 32) {
> - chip->cr0 |= SSCR0_EDSS;
> + if (!is_quark_x1000_ssp(drv_data))
> + chip->cr0 |= SSCR0_EDSS;
> chip->n_bytes = 4;
> chip->read = u32_reader;
> chip->write = u32_writer;
> @@ -1205,7 +1342,15 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
> drv_data->ioaddr = ssp->mmio_base;
> drv_data->ssdr_physical = ssp->phys_base + SSDR;
> if (pxa25x_ssp_comp(drv_data)) {
> - master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
> + switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
> + break;
> + default:
> + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
> + break;
> + }
> +
> drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
> drv_data->dma_cr1 = 0;
> drv_data->clear_sr = SSSR_ROR;
> @@ -1243,16 +1388,35 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
>
> /* Load default SSP configuration */
> write_SSCR0(0, drv_data->ioaddr);
> - write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) |
> - SSCR1_TxTresh(TX_THRESH_DFLT),
> - drv_data->ioaddr);
> - write_SSCR0(SSCR0_SCR(2)
> - | SSCR0_Motorola
> - | SSCR0_DataSize(8),
> - drv_data->ioaddr);
> + switch (drv_data->ssp_type) {
> + case QUARK_X1000_SSP:
> + write_SSCR1(QUARK_X1000_SSCR1_RxTresh(
> + RX_THRESH_QUARK_X1000_DFLT) |
> + QUARK_X1000_SSCR1_TxTresh(
> + TX_THRESH_QUARK_X1000_DFLT),
> + drv_data->ioaddr);
> +
> + /* using the Motorola SPI protocol and use 8 bit frame */
> + write_SSCR0(QUARK_X1000_SSCR0_Motorola
> + | QUARK_X1000_SSCR0_DataSize(8),
> + drv_data->ioaddr);
> + break;
> + default:
> + write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) |
> + SSCR1_TxTresh(TX_THRESH_DFLT),
> + drv_data->ioaddr);
> + write_SSCR0(SSCR0_SCR(2)
> + | SSCR0_Motorola
> + | SSCR0_DataSize(8),
> + drv_data->ioaddr);
> + break;
> + }
> +
> if (!pxa25x_ssp_comp(drv_data))
> write_SSTO(0, drv_data->ioaddr);
> - write_SSPSP(0, drv_data->ioaddr);
> +
> + if (!is_quark_x1000_ssp(drv_data))
> + write_SSPSP(0, drv_data->ioaddr);
>
> lpss_ssp_setup(drv_data);
>
> diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
> index 5adc2a1..6bec59c 100644
> --- a/drivers/spi/spi-pxa2xx.h
> +++ b/drivers/spi/spi-pxa2xx.h
> @@ -93,6 +93,7 @@ struct driver_data {
> struct chip_data {
> u32 cr0;
> u32 cr1;
> + u32 dds_rate;
> u32 psp;
> u32 timeout;
> u8 n_bytes;
> @@ -126,6 +127,7 @@ DEFINE_SSP_REG(SSCR1, 0x04)
> DEFINE_SSP_REG(SSSR, 0x08)
> DEFINE_SSP_REG(SSITR, 0x0c)
> DEFINE_SSP_REG(SSDR, 0x10)
> +DEFINE_SSP_REG(DDS_RATE, 0x28) /* DDS Clock Rate */
> DEFINE_SSP_REG(SSTO, 0x28)
> DEFINE_SSP_REG(SSPSP, 0x2c)
> DEFINE_SSP_REG(SSITF, SSITF)
> @@ -141,18 +143,22 @@ DEFINE_SSP_REG(SSIRF, SSIRF)
>
> static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
> {
> - if (drv_data->ssp_type == PXA25x_SSP)
> + switch (drv_data->ssp_type) {
> + case PXA25x_SSP:
> + case CE4100_SSP:
> + case QUARK_X1000_SSP:
> return 1;
> - if (drv_data->ssp_type == CE4100_SSP)
> - return 1;
> - return 0;
> + default:
> + return 0;
> + }
> }
>
> static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
> {
> void __iomem *reg = drv_data->ioaddr;
>
> - if (drv_data->ssp_type == CE4100_SSP)
> + if (drv_data->ssp_type == CE4100_SSP ||
> + drv_data->ssp_type == QUARK_X1000_SSP)
> val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
>
> write_SSSR(val, reg);
> diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/pxa2xx_ssp.h
> index f2b4051..a4668e6 100644
> --- a/include/linux/pxa2xx_ssp.h
> +++ b/include/linux/pxa2xx_ssp.h
> @@ -106,6 +106,26 @@
> #define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..4] */
> #define SSCR1_RFT (0x00000c00) /* Receive FIFO Threshold (mask) */
> #define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..4] */
> +
> +/* QUARK_X1000 SSCR0 bit definition */
> +#define QUARK_X1000_SSCR0_DSS (0x1F) /* Data Size Select (mask) */
> +#define QUARK_X1000_SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..32] */
> +#define QUARK_X1000_SSCR0_FRF (0x3 << 5) /* FRame Format (mask) */
> +#define QUARK_X1000_SSCR0_Motorola (0x0 << 5) /* Motorola's Serial Peripheral Interface (SPI) */
> +
> +#define RX_THRESH_QUARK_X1000_DFLT 1
> +#define TX_THRESH_QUARK_X1000_DFLT 16
> +
> +#define QUARK_X1000_SSSR_TFL_MASK (0x1F << 8) /* Transmit FIFO Level mask */
> +#define QUARK_X1000_SSSR_RFL_MASK (0x1F << 13) /* Receive FIFO Level mask */
> +
> +#define QUARK_X1000_SSCR1_TFT (0x1F << 6) /* Transmit FIFO Threshold (mask) */
> +#define QUARK_X1000_SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..32] */
> +#define QUARK_X1000_SSCR1_RFT (0x1F << 11) /* Receive FIFO Threshold (mask) */
> +#define QUARK_X1000_SSCR1_RxTresh(x) (((x) - 1) << 11) /* level [1..32] */
> +#define QUARK_X1000_SSCR1_STRF (1 << 17) /* Select FIFO or EFWR */
> +#define QUARK_X1000_SSCR1_EFWR (1 << 16) /* Enable FIFO Write/Read */
> +
> #endif
>
> /* extra bits in PXA255, PXA26x and PXA27x SSP ports */
> @@ -175,6 +195,7 @@ enum pxa_ssp_type {
> PXA910_SSP,
> CE4100_SSP,
> LPSS_SSP,
> + QUARK_X1000_SSP,
> };
>
> struct ssp_device {
--
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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