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@xxxxxxxxxxxxxxxxxxxxx> wrote: > From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> > > Add driver to fpga manager framework to allow configuration > of FPGA in Altera SoCFPGA parts. > > Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> > Acked-by: Michal Simek <michal.simek@xxxxxxxxxx> > --- > 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@xxxxxxxxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Altera SOCFPGA FPGA Manager"); > +MODULE_LICENSE("GPL v2"); > -- > 1.7.9.5 > > _______________________________________________ > devel mailing list > devel@xxxxxxxxxxxxxxxxxxxxxx > http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel Overall good job, and thanks for pushing this! Cheers, Moritz -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
