564 lines
16 KiB
C
564 lines
16 KiB
C
/*
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* FPGA Manager Driver for Altera Arria10 SoCFPGA
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*
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* Copyright (C) 2015-2016 Altera Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/fpga/fpga-mgr.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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#define A10_FPGAMGR_DCLKCNT_OFST 0x08
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#define A10_FPGAMGR_DCLKSTAT_OFST 0x0c
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#define A10_FPGAMGR_IMGCFG_CTL_00_OFST 0x70
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#define A10_FPGAMGR_IMGCFG_CTL_01_OFST 0x74
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#define A10_FPGAMGR_IMGCFG_CTL_02_OFST 0x78
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#define A10_FPGAMGR_IMGCFG_STAT_OFST 0x80
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#define A10_FPGAMGR_DCLKSTAT_DCLKDONE BIT(0)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NCONFIG BIT(0)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NSTATUS BIT(1)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_CONDONE BIT(2)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_NCONFIG BIT(8)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_NSTATUS_OE BIT(16)
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#define A10_FPGAMGR_IMGCFG_CTL_00_S2F_CONDONE_OE BIT(24)
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#define A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG BIT(0)
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#define A10_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST BIT(16)
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#define A10_FPGAMGR_IMGCFG_CTL_01_S2F_NCE BIT(24)
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#define A10_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL BIT(0)
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#define A10_FPGAMGR_IMGCFG_CTL_02_CDRATIO_MASK (BIT(16) | BIT(17))
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#define A10_FPGAMGR_IMGCFG_CTL_02_CDRATIO_SHIFT 16
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#define A10_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH BIT(24)
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#define A10_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH_SHIFT 24
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_CRC_ERROR BIT(0)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_EARLY_USERMODE BIT(1)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_USERMODE BIT(2)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN BIT(4)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN BIT(6)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_PR_READY BIT(9)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_PR_DONE BIT(10)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_PR_ERROR BIT(11)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_NCONFIG_PIN BIT(12)
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_MSEL_MASK (BIT(16) | BIT(17) | BIT(18))
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#define A10_FPGAMGR_IMGCFG_STAT_F2S_MSEL_SHIFT 16
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/* FPGA CD Ratio Value */
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#define CDRATIO_x1 0x0
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#define CDRATIO_x2 0x1
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#define CDRATIO_x4 0x2
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#define CDRATIO_x8 0x3
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/* Configuration width 16/32 bit */
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#define CFGWDTH_32 1
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#define CFGWDTH_16 0
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/*
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* struct a10_fpga_priv - private data for fpga manager
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* @regmap: regmap for register access
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* @fpga_data_addr: iomap for single address data register to FPGA
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* @clk: clock
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*/
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struct a10_fpga_priv {
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struct regmap *regmap;
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void __iomem *fpga_data_addr;
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struct clk *clk;
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};
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static bool socfpga_a10_fpga_writeable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case A10_FPGAMGR_DCLKCNT_OFST:
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case A10_FPGAMGR_DCLKSTAT_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_00_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_01_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_02_OFST:
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return true;
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}
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return false;
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}
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static bool socfpga_a10_fpga_readable_reg(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case A10_FPGAMGR_DCLKCNT_OFST:
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case A10_FPGAMGR_DCLKSTAT_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_00_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_01_OFST:
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case A10_FPGAMGR_IMGCFG_CTL_02_OFST:
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case A10_FPGAMGR_IMGCFG_STAT_OFST:
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return true;
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}
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return false;
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}
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static const struct regmap_config socfpga_a10_fpga_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.writeable_reg = socfpga_a10_fpga_writeable_reg,
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.readable_reg = socfpga_a10_fpga_readable_reg,
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.max_register = A10_FPGAMGR_IMGCFG_STAT_OFST,
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.cache_type = REGCACHE_NONE,
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};
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/*
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* from the register map description of cdratio in imgcfg_ctrl_02:
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* Normal Configuration : 32bit Passive Parallel
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* Partial Reconfiguration : 16bit Passive Parallel
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*/
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static void socfpga_a10_fpga_set_cfg_width(struct a10_fpga_priv *priv,
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int width)
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{
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width <<= A10_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH_SHIFT;
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_02_OFST,
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A10_FPGAMGR_IMGCFG_CTL_02_CFGWIDTH, width);
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}
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static void socfpga_a10_fpga_generate_dclks(struct a10_fpga_priv *priv,
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u32 count)
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{
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u32 val;
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/* Clear any existing DONE status. */
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regmap_write(priv->regmap, A10_FPGAMGR_DCLKSTAT_OFST,
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A10_FPGAMGR_DCLKSTAT_DCLKDONE);
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/* Issue the DCLK regmap. */
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regmap_write(priv->regmap, A10_FPGAMGR_DCLKCNT_OFST, count);
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/* wait till the dclkcnt done */
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regmap_read_poll_timeout(priv->regmap, A10_FPGAMGR_DCLKSTAT_OFST, val,
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val, 1, 100);
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/* Clear DONE status. */
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regmap_write(priv->regmap, A10_FPGAMGR_DCLKSTAT_OFST,
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A10_FPGAMGR_DCLKSTAT_DCLKDONE);
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}
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#define RBF_ENCRYPTION_MODE_OFFSET 69
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#define RBF_DECOMPRESS_OFFSET 229
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static int socfpga_a10_fpga_encrypted(u32 *buf32, size_t buf32_size)
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{
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if (buf32_size < RBF_ENCRYPTION_MODE_OFFSET + 1)
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return -EINVAL;
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/* Is the bitstream encrypted? */
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return ((buf32[RBF_ENCRYPTION_MODE_OFFSET] >> 2) & 3) != 0;
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}
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static int socfpga_a10_fpga_compressed(u32 *buf32, size_t buf32_size)
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{
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if (buf32_size < RBF_DECOMPRESS_OFFSET + 1)
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return -EINVAL;
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/* Is the bitstream compressed? */
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return !((buf32[RBF_DECOMPRESS_OFFSET] >> 1) & 1);
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}
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static unsigned int socfpga_a10_fpga_get_cd_ratio(unsigned int cfg_width,
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bool encrypt, bool compress)
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{
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unsigned int cd_ratio;
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/*
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* cd ratio is dependent on cfg width and whether the bitstream
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* is encrypted and/or compressed.
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*
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* | width | encr. | compr. | cd ratio |
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* | 16 | 0 | 0 | 1 |
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* | 16 | 0 | 1 | 4 |
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* | 16 | 1 | 0 | 2 |
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* | 16 | 1 | 1 | 4 |
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* | 32 | 0 | 0 | 1 |
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* | 32 | 0 | 1 | 8 |
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* | 32 | 1 | 0 | 4 |
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* | 32 | 1 | 1 | 8 |
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*/
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if (!compress && !encrypt)
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return CDRATIO_x1;
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if (compress)
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cd_ratio = CDRATIO_x4;
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else
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cd_ratio = CDRATIO_x2;
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/* If 32 bit, double the cd ratio by incrementing the field */
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if (cfg_width == CFGWDTH_32)
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cd_ratio += 1;
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return cd_ratio;
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}
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static int socfpga_a10_fpga_set_cdratio(struct fpga_manager *mgr,
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unsigned int cfg_width,
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const char *buf, size_t count)
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{
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struct a10_fpga_priv *priv = mgr->priv;
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unsigned int cd_ratio;
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int encrypt, compress;
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encrypt = socfpga_a10_fpga_encrypted((u32 *)buf, count / 4);
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if (encrypt < 0)
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return -EINVAL;
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compress = socfpga_a10_fpga_compressed((u32 *)buf, count / 4);
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if (compress < 0)
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return -EINVAL;
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cd_ratio = socfpga_a10_fpga_get_cd_ratio(cfg_width, encrypt, compress);
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_02_OFST,
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A10_FPGAMGR_IMGCFG_CTL_02_CDRATIO_MASK,
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cd_ratio << A10_FPGAMGR_IMGCFG_CTL_02_CDRATIO_SHIFT);
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return 0;
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}
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static u32 socfpga_a10_fpga_read_stat(struct a10_fpga_priv *priv)
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{
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u32 val;
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regmap_read(priv->regmap, A10_FPGAMGR_IMGCFG_STAT_OFST, &val);
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return val;
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}
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static int socfpga_a10_fpga_wait_for_pr_ready(struct a10_fpga_priv *priv)
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{
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u32 reg, i;
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for (i = 0; i < 10 ; i++) {
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reg = socfpga_a10_fpga_read_stat(priv);
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if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_ERROR)
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return -EINVAL;
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if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_READY)
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return 0;
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}
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return -ETIMEDOUT;
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}
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static int socfpga_a10_fpga_wait_for_pr_done(struct a10_fpga_priv *priv)
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{
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u32 reg, i;
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for (i = 0; i < 10 ; i++) {
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reg = socfpga_a10_fpga_read_stat(priv);
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if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_ERROR)
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return -EINVAL;
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if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_DONE)
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return 0;
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}
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return -ETIMEDOUT;
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}
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/* Start the FPGA programming by initialize the FPGA Manager */
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static int socfpga_a10_fpga_write_init(struct fpga_manager *mgr,
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struct fpga_image_info *info,
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const char *buf, size_t count)
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{
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struct a10_fpga_priv *priv = mgr->priv;
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unsigned int cfg_width;
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u32 msel, stat, mask;
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int ret;
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if (info->flags & FPGA_MGR_PARTIAL_RECONFIG)
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cfg_width = CFGWDTH_16;
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else
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return -EINVAL;
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/* Check for passive parallel (msel == 000 or 001) */
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msel = socfpga_a10_fpga_read_stat(priv);
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msel &= A10_FPGAMGR_IMGCFG_STAT_F2S_MSEL_MASK;
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msel >>= A10_FPGAMGR_IMGCFG_STAT_F2S_MSEL_SHIFT;
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if ((msel != 0) && (msel != 1)) {
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dev_dbg(&mgr->dev, "Fail: invalid msel=%d\n", msel);
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return -EINVAL;
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}
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/* Make sure no external devices are interfering */
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stat = socfpga_a10_fpga_read_stat(priv);
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mask = A10_FPGAMGR_IMGCFG_STAT_F2S_NCONFIG_PIN |
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A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN;
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if ((stat & mask) != mask)
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return -EINVAL;
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/* Set cfg width */
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socfpga_a10_fpga_set_cfg_width(priv, cfg_width);
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/* Determine cd ratio from bitstream header and set cd ratio */
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ret = socfpga_a10_fpga_set_cdratio(mgr, cfg_width, buf, count);
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if (ret)
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return ret;
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/*
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* Clear s2f_nce to enable chip select. Leave pr_request
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* unasserted and override disabled.
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*/
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regmap_write(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG);
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/* Set cfg_ctrl to enable s2f dclk and data */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_02_OFST,
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A10_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL,
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A10_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL);
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/*
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* Disable overrides not needed for pr.
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* s2f_config==1 leaves reset deasseted.
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*/
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regmap_write(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_00_OFST,
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A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NCONFIG |
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A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_NSTATUS |
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A10_FPGAMGR_IMGCFG_CTL_00_S2F_NENABLE_CONDONE |
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A10_FPGAMGR_IMGCFG_CTL_00_S2F_NCONFIG);
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/* Enable override for data, dclk, nce, and pr_request to CSS */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG, 0);
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/* Send some clocks to clear out any errors */
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socfpga_a10_fpga_generate_dclks(priv, 256);
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/* Assert pr_request */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST);
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/* Provide 2048 DCLKs before starting the config data streaming. */
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socfpga_a10_fpga_generate_dclks(priv, 0x7ff);
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/* Wait for pr_ready */
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return socfpga_a10_fpga_wait_for_pr_ready(priv);
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}
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/*
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* write data to the FPGA data register
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*/
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static int socfpga_a10_fpga_write(struct fpga_manager *mgr, const char *buf,
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size_t count)
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{
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struct a10_fpga_priv *priv = mgr->priv;
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u32 *buffer_32 = (u32 *)buf;
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size_t i = 0;
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if (count <= 0)
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return -EINVAL;
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/* Write out the complete 32-bit chunks */
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while (count >= sizeof(u32)) {
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writel(buffer_32[i++], priv->fpga_data_addr);
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count -= sizeof(u32);
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}
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/* Write out remaining non 32-bit chunks */
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switch (count) {
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case 3:
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writel(buffer_32[i++] & 0x00ffffff, priv->fpga_data_addr);
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break;
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case 2:
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writel(buffer_32[i++] & 0x0000ffff, priv->fpga_data_addr);
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break;
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case 1:
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writel(buffer_32[i++] & 0x000000ff, priv->fpga_data_addr);
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break;
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case 0:
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break;
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default:
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/* This will never happen */
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return -EFAULT;
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}
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return 0;
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}
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static int socfpga_a10_fpga_write_complete(struct fpga_manager *mgr,
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struct fpga_image_info *info)
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{
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struct a10_fpga_priv *priv = mgr->priv;
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u32 reg;
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int ret;
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/* Wait for pr_done */
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ret = socfpga_a10_fpga_wait_for_pr_done(priv);
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/* Clear pr_request */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_PR_REQUEST, 0);
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/* Send some clocks to clear out any errors */
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socfpga_a10_fpga_generate_dclks(priv, 256);
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/* Disable s2f dclk and data */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_02_OFST,
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A10_FPGAMGR_IMGCFG_CTL_02_EN_CFG_CTRL, 0);
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/* Deassert chip select */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NCE,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NCE);
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/* Disable data, dclk, nce, and pr_request override to CSS */
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regmap_update_bits(priv->regmap, A10_FPGAMGR_IMGCFG_CTL_01_OFST,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG,
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A10_FPGAMGR_IMGCFG_CTL_01_S2F_NENABLE_CONFIG);
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/* Return any errors regarding pr_done or pr_error */
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if (ret)
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return ret;
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/* Final check */
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reg = socfpga_a10_fpga_read_stat(priv);
|
|
|
|
if (((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_USERMODE) == 0) ||
|
|
((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_CONDONE_PIN) == 0) ||
|
|
((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN) == 0)) {
|
|
dev_dbg(&mgr->dev,
|
|
"Timeout in final check. Status=%08xf\n", reg);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum fpga_mgr_states socfpga_a10_fpga_state(struct fpga_manager *mgr)
|
|
{
|
|
struct a10_fpga_priv *priv = mgr->priv;
|
|
u32 reg = socfpga_a10_fpga_read_stat(priv);
|
|
|
|
if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_USERMODE)
|
|
return FPGA_MGR_STATE_OPERATING;
|
|
|
|
if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_PR_READY)
|
|
return FPGA_MGR_STATE_WRITE;
|
|
|
|
if (reg & A10_FPGAMGR_IMGCFG_STAT_F2S_CRC_ERROR)
|
|
return FPGA_MGR_STATE_WRITE_COMPLETE_ERR;
|
|
|
|
if ((reg & A10_FPGAMGR_IMGCFG_STAT_F2S_NSTATUS_PIN) == 0)
|
|
return FPGA_MGR_STATE_RESET;
|
|
|
|
return FPGA_MGR_STATE_UNKNOWN;
|
|
}
|
|
|
|
static const struct fpga_manager_ops socfpga_a10_fpga_mgr_ops = {
|
|
.initial_header_size = (RBF_DECOMPRESS_OFFSET + 1) * 4,
|
|
.state = socfpga_a10_fpga_state,
|
|
.write_init = socfpga_a10_fpga_write_init,
|
|
.write = socfpga_a10_fpga_write,
|
|
.write_complete = socfpga_a10_fpga_write_complete,
|
|
};
|
|
|
|
static int socfpga_a10_fpga_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct a10_fpga_priv *priv;
|
|
void __iomem *reg_base;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
/* First mmio base is for register access */
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg_base = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(reg_base))
|
|
return PTR_ERR(reg_base);
|
|
|
|
/* Second mmio base is for writing FPGA image data */
|
|
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);
|
|
|
|
/* regmap for register access */
|
|
priv->regmap = devm_regmap_init_mmio(dev, reg_base,
|
|
&socfpga_a10_fpga_regmap_config);
|
|
if (IS_ERR(priv->regmap))
|
|
return -ENODEV;
|
|
|
|
priv->clk = devm_clk_get(dev, NULL);
|
|
if (IS_ERR(priv->clk)) {
|
|
dev_err(dev, "no clock specified\n");
|
|
return PTR_ERR(priv->clk);
|
|
}
|
|
|
|
ret = clk_prepare_enable(priv->clk);
|
|
if (ret) {
|
|
dev_err(dev, "could not enable clock\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ret = fpga_mgr_register(dev, "SoCFPGA Arria10 FPGA Manager",
|
|
&socfpga_a10_fpga_mgr_ops, priv);
|
|
if (ret) {
|
|
clk_disable_unprepare(priv->clk);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int socfpga_a10_fpga_remove(struct platform_device *pdev)
|
|
{
|
|
struct fpga_manager *mgr = platform_get_drvdata(pdev);
|
|
struct a10_fpga_priv *priv = mgr->priv;
|
|
|
|
fpga_mgr_unregister(&pdev->dev);
|
|
clk_disable_unprepare(priv->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id socfpga_a10_fpga_of_match[] = {
|
|
{ .compatible = "altr,socfpga-a10-fpga-mgr", },
|
|
{},
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, socfpga_a10_fpga_of_match);
|
|
|
|
static struct platform_driver socfpga_a10_fpga_driver = {
|
|
.probe = socfpga_a10_fpga_probe,
|
|
.remove = socfpga_a10_fpga_remove,
|
|
.driver = {
|
|
.name = "socfpga_a10_fpga_manager",
|
|
.of_match_table = socfpga_a10_fpga_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(socfpga_a10_fpga_driver);
|
|
|
|
MODULE_AUTHOR("Alan Tull <atull@opensource.altera.com>");
|
|
MODULE_DESCRIPTION("SoCFPGA Arria10 FPGA Manager");
|
|
MODULE_LICENSE("GPL v2");
|