[PATCH v3 3/3] can: sja1000: of: add compatibility with Technologic Systems version
From: Damien Riegel <hidden>
Date: 2016-01-12 22:32:52
Also in:
lkml, netdev
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
Technologic Systems provides an IP compatible with the SJA1000,
instantiated in an FPGA. Because of some bus widths issue, access to
registers is made through a "window" that works like this:
base + 0x0: address to read/write
base + 0x2: 8-bit register value
This commit adds a new compatible device, "technologic,sja1000", with
read and write functions using the window mechanism.
Signed-off-by: Damien Riegel <redacted>
---
drivers/net/can/sja1000/sja1000_platform.c | 47 ++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/net/can/sja1000/sja1000_platform.c b/drivers/net/can/sja1000/sja1000_platform.c
index ea4e18b..84c95cd 100644
--- a/drivers/net/can/sja1000/sja1000_platform.c
+++ b/drivers/net/can/sja1000/sja1000_platform.c@@ -45,6 +45,10 @@ struct sja1000_of_data { int (*init)(struct sja1000_priv *priv, struct device_node *of); }; +struct technologic_priv { + spinlock_t io_lock; +}; + static u8 sp_read_reg8(const struct sja1000_priv *priv, int reg) { return ioread8(priv->reg_base + reg);
@@ -75,6 +79,43 @@ static void sp_write_reg32(const struct sja1000_priv *priv, int reg, u8 val) iowrite8(val, priv->reg_base + reg * 4); } +static u8 technologic_read_reg16(const struct sja1000_priv *priv, int reg) +{ + struct technologic_priv *tp = priv->priv; + unsigned long flags; + u8 val; + + spin_lock_irqsave(&tp->io_lock, flags); + iowrite16(reg, priv->reg_base + 0); + val = ioread16(priv->reg_base + 2); + spin_unlock_irqrestore(&tp->io_lock, flags); + + return val; +} + +static void technologic_write_reg16(const struct sja1000_priv *priv, + int reg, u8 val) +{ + struct technologic_priv *tp = priv->priv; + unsigned long flags; + + spin_lock_irqsave(&tp->io_lock, flags); + iowrite16(reg, priv->reg_base + 0); + iowrite16(val, priv->reg_base + 2); + spin_unlock_irqrestore(&tp->io_lock, flags); +} + +static int technologic_init(struct sja1000_priv *priv, struct device_node *of) +{ + struct technologic_priv *tp = priv->priv; + + priv->read_reg = technologic_read_reg16; + priv->write_reg = technologic_write_reg16; + spin_lock_init(&tp->io_lock); + + return 0; +} + static void sp_populate(struct sja1000_priv *priv, struct sja1000_platform_data *pdata, unsigned long resource_mem_flags)
@@ -159,8 +200,14 @@ static void sp_populate_of(struct sja1000_priv *priv, struct device_node *of) priv->cdr |= CDR_CBP; /* default */ } +struct sja1000_of_data technologic_data = { + .priv_sz = sizeof(struct technologic_priv), + .init = technologic_init, +}; + static const struct of_device_id sp_of_table[] = { {.compatible = "nxp,sja1000"}, + {.compatible = "technologic,sja1000", .data = &technologic_data}, {}, }; MODULE_DEVICE_TABLE(of, sp_of_table);
--
2.5.0