Re: [PATCH v9 7/7] staging: fpga manager: add driver for socfpga fpga manager

Moritz Fischer
2015-07-17T21:06:00Z

Alan,

it looks pretty good so far. I have worked with Michal and developed a
Zynq equivalent against your last
patchset which can be found in the Xilinx tree now.

I just briefly glanced the changes below just two nits that caught my eye.
I'll take a closer look while trying to update the zynq-fpga driver to
work with your changes.

On Fri, Jul 17, 2015 at 8:51 AM, <atull@opensource.altera.com> wrote:
> From: Alan Tull <atull@opensource.altera.com>
>
> Add driver to fpga manager framework to allow configuration
> of FPGA in Altera SoCFPGA parts.
>
> Signed-off-by: Alan Tull <atull@opensource.altera.com>
> Acked-by: Michal Simek <michal.simek@xilinx.com>
> ---
> v2: fpga_manager struct now contains struct device
> fpga_manager_register parameters now take device
>
> v3: skip a version to align versions
>
> v4: move to drivers/staging
>
> v5: fix array_size.cocci warnings
> fix platform_no_drv_owner.cocci warnings
> Remove .owner = THIS_MODULE
> include asm/irq.h
> clean up list of includes
> use altera_fpga_reset for ops
> use enum fpga_mgr_states or u32 as needed
> use devm_request_irq
> check irq <= 0 instead of == NO_IRQ
> Use ARRAY_SIZE
> rename altera -> socfpga
> static const socfpga_fpga_ops
> header moved to linux/fpga/ folder
> remove ifdef'ed code
> use platform_get_resource and platform_get_irq
> move .probe and .remove lines adjacent
> use module_platform_driver
> use __maybe_unused
> only need to 'if (IS_ENABLED(CONFIG_REGULATOR))' in one fn
> fix "unsigned 'mode' is never < 0"
>
> v6: return error for (unused) default of case statement
>
> v7: PTR_ERR should access the value just tested by IS_ERR
>
> v8: change compatible string to be more chip specific
>
> v9: update copyright year
> remove suspend/resume support and regulators
> use updated fn names for register/unregister
> use updated params for write_init
> check for partial reconfiguration request
> ---
> drivers/staging/fpga/Kconfig | 6 +
> drivers/staging/fpga/Makefile | 1 +
> drivers/staging/fpga/socfpga.c | 616 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 623 insertions(+)
> create mode 100644 drivers/staging/fpga/socfpga.c
>
> diff --git a/drivers/staging/fpga/Kconfig b/drivers/staging/fpga/Kconfig
> index 8d003e3..36dd7b6 100644
> --- a/drivers/staging/fpga/Kconfig
> +++ b/drivers/staging/fpga/Kconfig
> @@ -13,6 +13,12 @@ config FPGA
>
> if FPGA
>
> +config FPGA_MGR_SOCFPGA
> + bool "Altera SOCFPGA FPGA Manager"
> + depends on ARCH_SOCFPGA
> + help
> + FPGA manager driver support for Altera SOCFPGA.
> +
> config SIMPLE_FPGA_BUS
> bool "Simple FPGA Bus"
> depends on OF
> diff --git a/drivers/staging/fpga/Makefile b/drivers/staging/fpga/Makefile
> index 6115213..d1f9406 100644
> --- a/drivers/staging/fpga/Makefile
> +++ b/drivers/staging/fpga/Makefile
> @@ -7,3 +7,4 @@ obj-$(CONFIG_FPGA) += fpga-mgr.o
> obj-$(CONFIG_SIMPLE_FPGA_BUS) += simple-fpga-bus.o
>
> # FPGA Manager Drivers
> +obj-$(CONFIG_FPGA_MGR_SOCFPGA) += socfpga.o
> diff --git a/drivers/staging/fpga/socfpga.c b/drivers/staging/fpga/socfpga.c
> new file mode 100644
> index 0000000..38276f9
> --- /dev/null
> +++ b/drivers/staging/fpga/socfpga.c
> @@ -0,0 +1,616 @@
> +/*
> + * FPGA Manager Driver for Altera SOCFPGA
> + *
> + * Copyright (C) 2013-2015 Altera Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program. If not, see <http://www.gnu.org/licenses/>.
> + */
> +#include <linux/completion.h>
> +#include <linux/delay.h>
> +#include <linux/fpga/fpga-mgr.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/pm.h>
As you removed the suspend / resume part, do you still need this?
> +#include <linux/string.h>
> +
> +/* Register offsets */
> +#define SOCFPGA_FPGMGR_STAT_OFST 0x0
> +#define SOCFPGA_FPGMGR_CTL_OFST 0x4
> +#define SOCFPGA_FPGMGR_DCLKCNT_OFST 0x8
> +#define SOCFPGA_FPGMGR_DCLKSTAT_OFST 0xc
> +#define SOCFPGA_FPGMGR_GPIO_INTEN_OFST 0x830
> +#define SOCFPGA_FPGMGR_GPIO_INTMSK_OFST 0x834
> +#define SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST 0x838
> +#define SOCFPGA_FPGMGR_GPIO_INT_POL_OFST 0x83c
> +#define SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST 0x840
> +#define SOCFPGA_FPGMGR_GPIO_RAW_INTSTAT_OFST 0x844
> +#define SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST 0x84c
> +#define SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST 0x850
> +
> +/* Register bit defines */
> +/* SOCFPGA_FPGMGR_STAT register mode field values */
> +#define SOCFPGA_FPGMGR_STAT_POWER_UP 0x0 /*ramping*/
> +#define SOCFPGA_FPGMGR_STAT_RESET 0x1
> +#define SOCFPGA_FPGMGR_STAT_CFG 0x2
> +#define SOCFPGA_FPGMGR_STAT_INIT 0x3
> +#define SOCFPGA_FPGMGR_STAT_USER_MODE 0x4
> +#define SOCFPGA_FPGMGR_STAT_UNKNOWN 0x5
> +#define SOCFPGA_FPGMGR_STAT_STATE_MASK 0x7
> +/* This is a flag value that doesn't really happen in this register field */
> +#define SOCFPGA_FPGMGR_STAT_POWER_OFF 0x0
> +
> +#define MSEL_PP16_FAST_NOAES_NODC 0x0
> +#define MSEL_PP16_FAST_AES_NODC 0x1
> +#define MSEL_PP16_FAST_AESOPT_DC 0x2
> +#define MSEL_PP16_SLOW_NOAES_NODC 0x4
> +#define MSEL_PP16_SLOW_AES_NODC 0x5
> +#define MSEL_PP16_SLOW_AESOPT_DC 0x6
> +#define MSEL_PP32_FAST_NOAES_NODC 0x8
> +#define MSEL_PP32_FAST_AES_NODC 0x9
> +#define MSEL_PP32_FAST_AESOPT_DC 0xa
> +#define MSEL_PP32_SLOW_NOAES_NODC 0xc
> +#define MSEL_PP32_SLOW_AES_NODC 0xd
> +#define MSEL_PP32_SLOW_AESOPT_DC 0xe
> +#define SOCFPGA_FPGMGR_STAT_MSEL_MASK 0x000000f8
> +#define SOCFPGA_FPGMGR_STAT_MSEL_SHIFT 3
> +
> +/* SOCFPGA_FPGMGR_CTL register */
> +#define SOCFPGA_FPGMGR_CTL_EN 0x00000001
> +#define SOCFPGA_FPGMGR_CTL_NCE 0x00000002
> +#define SOCFPGA_FPGMGR_CTL_NCFGPULL 0x00000004
> +
> +#define CDRATIO_X1 0x00000000
> +#define CDRATIO_X2 0x00000040
> +#define CDRATIO_X4 0x00000080
> +#define CDRATIO_X8 0x000000c0
> +#define SOCFPGA_FPGMGR_CTL_CDRATIO_MASK 0x000000c0
> +
> +#define SOCFPGA_FPGMGR_CTL_AXICFGEN 0x00000100
> +
> +#define CFGWDTH_16 0x00000000
> +#define CFGWDTH_32 0x00000200
> +#define SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK 0x00000200
> +
> +/* SOCFPGA_FPGMGR_DCLKSTAT register */
> +#define SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE 0x1
> +
> +/* SOCFPGA_FPGMGR_GPIO_* registers share the same bit positions */
> +#define SOCFPGA_FPGMGR_MON_NSTATUS 0x0001
> +#define SOCFPGA_FPGMGR_MON_CONF_DONE 0x0002
> +#define SOCFPGA_FPGMGR_MON_INIT_DONE 0x0004
> +#define SOCFPGA_FPGMGR_MON_CRC_ERROR 0x0008
> +#define SOCFPGA_FPGMGR_MON_CVP_CONF_DONE 0x0010
> +#define SOCFPGA_FPGMGR_MON_PR_READY 0x0020
> +#define SOCFPGA_FPGMGR_MON_PR_ERROR 0x0040
> +#define SOCFPGA_FPGMGR_MON_PR_DONE 0x0080
> +#define SOCFPGA_FPGMGR_MON_NCONFIG_PIN 0x0100
> +#define SOCFPGA_FPGMGR_MON_NSTATUS_PIN 0x0200
> +#define SOCFPGA_FPGMGR_MON_CONF_DONE_PIN 0x0400
> +#define SOCFPGA_FPGMGR_MON_FPGA_POWER_ON 0x0800
> +#define SOCFPGA_FPGMGR_MON_STATUS_MASK 0x0fff
> +
> +#define SOCFPGA_FPGMGR_NUM_SUPPLIES 3
> +#define SOCFPGA_RESUME_TIMEOUT 3
> +
> +/* In power-up order. Reverse for power-down. */
> +static const char *supply_names[SOCFPGA_FPGMGR_NUM_SUPPLIES] __maybe_unused = {
> + "FPGA-1.5V",
> + "FPGA-1.1V",
> + "FPGA-2.5V",
> +};
> +
> +struct socfpga_fpga_priv {
> + void __iomem *fpga_base_addr;
> + void __iomem *fpga_data_addr;
> + struct completion status_complete;
> + int irq;
> +};
> +
> +struct cfgmgr_mode {
> + /* Values to set in the CTRL register */
> + u32 ctrl;
> +
> + /* flag that this table entry is a valid mode */
> + bool valid;
> +};
> +
> +/* For SOCFPGA_FPGMGR_STAT_MSEL field */
> +static struct cfgmgr_mode cfgmgr_modes[] = {
> + [MSEL_PP16_FAST_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
> + [MSEL_PP16_FAST_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
> + [MSEL_PP16_FAST_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
> + [MSEL_PP16_SLOW_NOAES_NODC] = { CFGWDTH_16 | CDRATIO_X1, 1 },
> + [MSEL_PP16_SLOW_AES_NODC] = { CFGWDTH_16 | CDRATIO_X2, 1 },
> + [MSEL_PP16_SLOW_AESOPT_DC] = { CFGWDTH_16 | CDRATIO_X4, 1 },
> + [MSEL_PP32_FAST_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
> + [MSEL_PP32_FAST_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
> + [MSEL_PP32_FAST_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
> + [MSEL_PP32_SLOW_NOAES_NODC] = { CFGWDTH_32 | CDRATIO_X1, 1 },
> + [MSEL_PP32_SLOW_AES_NODC] = { CFGWDTH_32 | CDRATIO_X4, 1 },
> + [MSEL_PP32_SLOW_AESOPT_DC] = { CFGWDTH_32 | CDRATIO_X8, 1 },
> +};
> +
> +static u32 socfpga_fpga_readl(struct socfpga_fpga_priv *priv, u32 reg_offset)
> +{
> + return readl(priv->fpga_base_addr + reg_offset);
> +}
> +
> +static void socfpga_fpga_writel(struct socfpga_fpga_priv *priv, u32 reg_offset,
> + u32 value)
> +{
> + writel(value, priv->fpga_base_addr + reg_offset);
> +}
> +
> +static u32 socfpga_fpga_raw_readl(struct socfpga_fpga_priv *priv,
> + u32 reg_offset)
> +{
> + return __raw_readl(priv->fpga_base_addr + reg_offset);
> +}
> +
> +static void socfpga_fpga_raw_writel(struct socfpga_fpga_priv *priv,
> + u32 reg_offset, u32 value)
> +{
> + __raw_writel(value, priv->fpga_base_addr + reg_offset);
> +}
> +
> +static void socfpga_fpga_data_writel(struct socfpga_fpga_priv *priv, u32 value)
> +{
> + writel(value, priv->fpga_data_addr);
> +}
> +
> +static inline void socfpga_fpga_set_bitsl(struct socfpga_fpga_priv *priv,
> + u32 offset, u32 bits)
> +{
> + u32 val;
> +
> + val = socfpga_fpga_readl(priv, offset);
> + val |= bits;
> + socfpga_fpga_writel(priv, offset, val);
> +}
> +
> +static inline void socfpga_fpga_clr_bitsl(struct socfpga_fpga_priv *priv,
> + u32 offset, u32 bits)
> +{
> + u32 val;
> +
> + val = socfpga_fpga_readl(priv, offset);
> + val &= ~bits;
> + socfpga_fpga_writel(priv, offset, val);
> +}
> +
> +static u32 socfpga_fpga_mon_status_get(struct socfpga_fpga_priv *priv)
> +{
> + return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST) &
> + SOCFPGA_FPGMGR_MON_STATUS_MASK;
> +}
> +
> +static u32 socfpga_fpga_state_get(struct socfpga_fpga_priv *priv)
> +{
> + u32 status = socfpga_fpga_mon_status_get(priv);
> +
> + if ((status & SOCFPGA_FPGMGR_MON_FPGA_POWER_ON) == 0)
> + return SOCFPGA_FPGMGR_STAT_POWER_OFF;
> +
> + return socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST) &
> + SOCFPGA_FPGMGR_STAT_STATE_MASK;
> +}
> +
> +static void socfpga_fpga_clear_done_status(struct socfpga_fpga_priv *priv)
> +{
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST,
> + SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE);
> +}
> +
> +/*
> + * Set the DCLKCNT, wait for DCLKSTAT to report the count completed, and clear
> + * the complete status.
> + */
> +static int socfpga_fpga_dclk_set_and_wait_clear(struct socfpga_fpga_priv *priv,
> + u32 count)
> +{
> + int timeout = 2;
> + u32 done;
> +
> + /* Clear any existing DONE status. */
> + if (socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST))
> + socfpga_fpga_clear_done_status(priv);
> +
> + /* Issue the DCLK count. */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_DCLKCNT_OFST, count);
> +
> + /* Poll DCLKSTAT to see if it completed in the timeout period. */
> + do {
> + done = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_DCLKSTAT_OFST);
> + if (done == SOCFPGA_FPGMGR_DCLKSTAT_DCNTDONE_E_DONE) {
> + socfpga_fpga_clear_done_status(priv);
> + return 0;
> + }
> + udelay(1);
> + } while (timeout--);
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int socfpga_fpga_wait_for_state(struct socfpga_fpga_priv *priv,
> + u32 state)
> +{
> + int timeout = 2;
> +
> + /*
> + * HW doesn't support an interrupt for changes in state, so poll to see
> + * if it matches the requested state within the timeout period.
> + */
> + do {
> + if ((socfpga_fpga_state_get(priv) & state) != 0)
> + return 0;
> + msleep(20);
> + } while (timeout--);
> +
> + return -ETIMEDOUT;
> +}
> +
> +static void socfpga_fpga_enable_irqs(struct socfpga_fpga_priv *priv, u32 irqs)
> +{
> + /* set irqs to level sensitive */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTTYPE_LEVEL_OFST, 0);
> +
> + /* set interrupt polarity */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INT_POL_OFST, irqs);
> +
> + /* clear irqs */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
> +
> + /* unmask interrupts */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTMSK_OFST, 0);
> +
> + /* enable interrupts */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, irqs);
> +}
> +
> +static void socfpga_fpga_disable_irqs(struct socfpga_fpga_priv *priv)
> +{
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
> +}
> +
> +static irqreturn_t socfpga_fpga_isr(int irq, void *dev_id)
> +{
> + struct socfpga_fpga_priv *priv = dev_id;
> + u32 irqs, st;
> + bool conf_done, nstatus;
> +
> + /* clear irqs */
> + irqs = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_INTSTAT_OFST);
> +
> + socfpga_fpga_raw_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST, irqs);
> +
> + st = socfpga_fpga_raw_readl(priv, SOCFPGA_FPGMGR_GPIO_EXT_PORTA_OFST);
> + conf_done = (st & SOCFPGA_FPGMGR_MON_CONF_DONE) != 0;
> + nstatus = (st & SOCFPGA_FPGMGR_MON_NSTATUS) != 0;
> +
> + /* success */
> + if (conf_done && nstatus) {
> + /* disable irqs */
> + socfpga_fpga_raw_writel(priv,
> + SOCFPGA_FPGMGR_GPIO_INTEN_OFST, 0);
> + complete(&priv->status_complete);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int socfpga_fpga_wait_for_config_done(struct socfpga_fpga_priv *priv)
> +{
> + int timeout, ret = 0;
> +
> + socfpga_fpga_disable_irqs(priv);
> + init_completion(&priv->status_complete);
> + socfpga_fpga_enable_irqs(priv, SOCFPGA_FPGMGR_MON_CONF_DONE);
> +
> + timeout = wait_for_completion_interruptible_timeout(
> + &priv->status_complete,
> + msecs_to_jiffies(10));
> + if (timeout == 0)
> + ret = -ETIMEDOUT;
> +
> + socfpga_fpga_disable_irqs(priv);
> + return ret;
> +}
> +
> +static int socfpga_fpga_cfg_mode_get(struct socfpga_fpga_priv *priv)
> +{
> + u32 msel;
> +
> + msel = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_STAT_OFST);
> + msel &= SOCFPGA_FPGMGR_STAT_MSEL_MASK;
> + msel >>= SOCFPGA_FPGMGR_STAT_MSEL_SHIFT;
> +
> + /* Check that this MSEL setting is supported */
> + if ((msel >= ARRAY_SIZE(cfgmgr_modes)) || !cfgmgr_modes[msel].valid)
> + return -EINVAL;
> +
> + return msel;
> +}
> +
> +static int socfpga_fpga_cfg_mode_set(struct socfpga_fpga_priv *priv)
> +{
> + u32 ctrl_reg;
> + int mode;
> +
> + /* get value from MSEL pins */
> + mode = socfpga_fpga_cfg_mode_get(priv);
> + if (mode < 0)
> + return mode;
> +
> + /* Adjust CTRL for the CDRATIO */
> + ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
> + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CDRATIO_MASK;
> + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_CFGWDTH_MASK;
> + ctrl_reg |= cfgmgr_modes[mode].ctrl;
> +
> + /* Set NCE to 0. */
> + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCE;
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
> +
> + return 0;
> +}
> +
> +static int socfpga_fpga_reset(struct fpga_manager *mgr)
> +{
> + struct socfpga_fpga_priv *priv = mgr->priv;
> + u32 ctrl_reg, status;
> + int ret;
> +
> + /*
> + * Step 1:
> + * - Set CTRL.CFGWDTH, CTRL.CDRATIO to match cfg mode
> + * - Set CTRL.NCE to 0
> + */
> + ret = socfpga_fpga_cfg_mode_set(priv);
> + if (ret)
> + return ret;
> +
> + /* Step 2: Set CTRL.EN to 1 */
> + socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
> + SOCFPGA_FPGMGR_CTL_EN);
> +
> + /* Step 3: Set CTRL.NCONFIGPULL to 1 to put FPGA in reset */
> + ctrl_reg = socfpga_fpga_readl(priv, SOCFPGA_FPGMGR_CTL_OFST);
> + ctrl_reg |= SOCFPGA_FPGMGR_CTL_NCFGPULL;
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
> +
> + /* Step 4: Wait for STATUS.MODE to report FPGA is in reset phase */
> + status = socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_RESET);
> +
> + /* Step 5: Set CONTROL.NCONFIGPULL to 0 to release FPGA from reset */
> + ctrl_reg &= ~SOCFPGA_FPGMGR_CTL_NCFGPULL;
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_CTL_OFST, ctrl_reg);
> +
> + /* Timeout waiting for reset */
> + if (status)
> + return -ETIMEDOUT;
> +
> + return 0;
> +}
> +
> +/*
> + * Prepare the FPGA to receive the configuration data.
> + */
> +static int socfpga_fpga_ops_configure_init(struct fpga_manager *mgr, u32 flags,
> + const char *buf, size_t count)
Is there a reason buf and count need to be passed here?
> +{
> + struct socfpga_fpga_priv *priv = mgr->priv;
> + int ret;
> +
> + if (flags & FPGA_MGR_PARTIAL_RECONFIG) {
> + dev_err(&mgr->dev, "Partial reconfiguration not supported.\n");
> + return -EINVAL;
> + }
> + /* Steps 1 - 5: Reset the FPGA */
> + ret = socfpga_fpga_reset(mgr);
> + if (ret)
> + return ret;
> +
> + /* Step 6: Wait for FPGA to enter configuration phase */
> + if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_CFG))
> + return -ETIMEDOUT;
> +
> + /* Step 7: Clear nSTATUS interrupt */
> + socfpga_fpga_writel(priv, SOCFPGA_FPGMGR_GPIO_PORTA_EOI_OFST,
> + SOCFPGA_FPGMGR_MON_NSTATUS);
> +
> + /* Step 8: Set CTRL.AXICFGEN to 1 to enable transfer of config data */
> + socfpga_fpga_set_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
> + SOCFPGA_FPGMGR_CTL_AXICFGEN);
> +
> + return 0;
> +}
> +
> +/*
> + * Step 9: write data to the FPGA data register
> + */
> +static int socfpga_fpga_ops_configure_write(struct fpga_manager *mgr,
> + const char *buf, size_t count)
> +{
> + struct socfpga_fpga_priv *priv = mgr->priv;
> + u32 *buffer_32 = (u32 *)buf;
> + size_t i = 0;
> +
> + if (count <= 0)
> + return -EINVAL;
> +
> + /* Write out the complete 32-bit chunks. */
> + while (count >= sizeof(u32)) {
> + socfpga_fpga_data_writel(priv, buffer_32[i++]);
> + count -= sizeof(u32);
> + }
> +
> + /* Write out remaining non 32-bit chunks. */
> + switch (count) {
> + case 3:
> + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x00ffffff);
> + break;
> + case 2:
> + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x0000ffff);
> + break;
> + case 1:
> + socfpga_fpga_data_writel(priv, buffer_32[i++] & 0x000000ff);
> + break;
> + case 0:
> + break;
> + default:
> + /* This will never happen. */
> + return -EFAULT;
> + }
> +
> + return 0;
> +}
> +
> +static int socfpga_fpga_ops_configure_complete(struct fpga_manager *mgr)
> +{
> + struct socfpga_fpga_priv *priv = mgr->priv;
> + u32 status;
> +
> + /*
> + * Step 10:
> + * - Observe CONF_DONE and nSTATUS (active low)
> + * - if CONF_DONE = 1 and nSTATUS = 1, configuration was successful
> + * - if CONF_DONE = 0 and nSTATUS = 0, configuration failed
> + */
> + status = socfpga_fpga_wait_for_config_done(priv);
> + if (status)
> + return status;
> +
> + /* Step 11: Clear CTRL.AXICFGEN to disable transfer of config data */
> + socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
> + SOCFPGA_FPGMGR_CTL_AXICFGEN);
> +
> + /*
> + * Step 12:
> + * - Write 4 to DCLKCNT
> + * - Wait for STATUS.DCNTDONE = 1
> + * - Clear W1C bit in STATUS.DCNTDONE
> + */
> + if (socfpga_fpga_dclk_set_and_wait_clear(priv, 4))
> + return -ETIMEDOUT;
> +
> + /* Step 13: Wait for STATUS.MODE to report USER MODE */
> + if (socfpga_fpga_wait_for_state(priv, SOCFPGA_FPGMGR_STAT_USER_MODE))
> + return -ETIMEDOUT;
> +
> + /* Step 14: Set CTRL.EN to 0 */
> + socfpga_fpga_clr_bitsl(priv, SOCFPGA_FPGMGR_CTL_OFST,
> + SOCFPGA_FPGMGR_CTL_EN);
> +
> + return 0;
> +}
> +
> +/* Translate state register values to FPGA framework state */
> +static const enum fpga_mgr_states socfpga_state_to_framework_state[] = {
> + [SOCFPGA_FPGMGR_STAT_POWER_OFF] = FPGA_MGR_STATE_POWER_OFF,
> + [SOCFPGA_FPGMGR_STAT_RESET] = FPGA_MGR_STATE_RESET,
> + [SOCFPGA_FPGMGR_STAT_CFG] = FPGA_MGR_STATE_WRITE_INIT,
> + [SOCFPGA_FPGMGR_STAT_INIT] = FPGA_MGR_STATE_WRITE_INIT,
> + [SOCFPGA_FPGMGR_STAT_USER_MODE] = FPGA_MGR_STATE_OPERATING,
> + [SOCFPGA_FPGMGR_STAT_UNKNOWN] = FPGA_MGR_STATE_UNKNOWN,
> +};
> +
> +static enum fpga_mgr_states socfpga_fpga_ops_state(struct fpga_manager *mgr)
> +{
> + struct socfpga_fpga_priv *priv = mgr->priv;
> + enum fpga_mgr_states ret;
> + u32 state;
> +
> + state = socfpga_fpga_state_get(priv);
> +
> + if (state < ARRAY_SIZE(socfpga_state_to_framework_state))
> + ret = socfpga_state_to_framework_state[state];
> + else
> + ret = FPGA_MGR_STATE_UNKNOWN;
> +
> + return ret;
> +}
> +
> +static const struct fpga_manager_ops socfpga_fpga_ops = {
> + .state = socfpga_fpga_ops_state,
> + .write_init = socfpga_fpga_ops_configure_init,
> + .write = socfpga_fpga_ops_configure_write,
> + .write_complete = socfpga_fpga_ops_configure_complete,
> +};
> +
> +static int socfpga_fpga_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct socfpga_fpga_priv *priv;
> + struct resource *res;
> + int ret;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + priv->fpga_base_addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(priv->fpga_base_addr))
> + return PTR_ERR(priv->fpga_base_addr);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + priv->fpga_data_addr = devm_ioremap_resource(dev, res);
> + if (IS_ERR(priv->fpga_data_addr))
> + return PTR_ERR(priv->fpga_data_addr);
> +
> + priv->irq = platform_get_irq(pdev, 0);
> + if (priv->irq < 0)
> + return priv->irq;
> +
> + ret = devm_request_irq(dev, priv->irq, socfpga_fpga_isr, 0,
> + dev_name(dev), priv);
> + if (IS_ERR_VALUE(ret))
> + return ret;
> +
> + return fpga_mgr_register(dev, "Altera SOCFPGA FPGA Manager",
> + &socfpga_fpga_ops, priv);
> +}
> +
> +static int socfpga_fpga_remove(struct platform_device *pdev)
> +{
> + fpga_mgr_unregister(&pdev->dev);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id socfpga_fpga_of_match[] = {
> + { .compatible = "altr,socfpga-fpga-mgr", },
> + {},
> +};
> +
> +MODULE_DEVICE_TABLE(of, socfpga_fpga_of_match);
> +#endif
> +
> +static struct platform_driver socfpga_fpga_driver = {
> + .probe = socfpga_fpga_probe,
> + .remove = socfpga_fpga_remove,
> + .driver = {
> + .name = "socfpga_fpga_manager",
> + .of_match_table = of_match_ptr(socfpga_fpga_of_match),
> + },
> +};
> +
> +module_platform_driver(socfpga_fpga_driver);
> +
> +MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
> +MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5
>
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> devel mailing list
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> http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

Overall good job, and thanks for pushing this!

Cheers,

Moritz