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net: zynq: Add support for GEM reset

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Perform reset before core initialization.
Standard flow which close to 99% users are using getting all IPs out of
reset that there is no need to reset IP again. This is because of all low
level initialization is done in previous bootloader stage.
In SOM case these IPs are not touched by previous bootloader stage that's
why reset needs to be called before IP is accessed to make sure that it is
in correct state.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Link: https://lore.kernel.org/r/5ae1c85b282d632bb62030f1f24a0065661b9153.1638804318.git.michal.simek@xilinx.com
This commit is contained in:
Michal Simek 2021-12-06 16:25:20 +01:00
parent 12133b11a7
commit b5ffc9f758
1 changed files with 26 additions and 0 deletions
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26
drivers/net/zynq_gem.c
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@ -21,6 +21,7 @@
#include <asm/cache.h> #include <asm/cache.h>
#include <asm/io.h> #include <asm/io.h>
#include <phy.h> #include <phy.h>
#include <reset.h>
#include <miiphy.h> #include <miiphy.h>
#include <wait_bit.h> #include <wait_bit.h>
#include <watchdog.h> #include <watchdog.h>
@ -215,6 +216,7 @@ struct zynq_gem_priv {
bool int_pcs; bool int_pcs;
bool dma_64bit; bool dma_64bit;
u32 clk_en_info; u32 clk_en_info;
struct reset_ctl_bulk resets;
}; };
static int phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum, static int phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
@ -686,12 +688,36 @@ static int zynq_gem_miiphy_write(struct mii_dev *bus, int addr, int devad,
return phywrite(priv, addr, reg, value); return phywrite(priv, addr, reg, value);
} }
static int zynq_gem_reset_init(struct udevice *dev)
{
struct zynq_gem_priv *priv = dev_get_priv(dev);
int ret;
ret = reset_get_bulk(dev, &priv->resets);
if (ret == -ENOTSUPP || ret == -ENOENT)
return 0;
else if (ret)
return ret;
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
reset_release_bulk(&priv->resets);
return ret;
}
return 0;
}
static int zynq_gem_probe(struct udevice *dev) static int zynq_gem_probe(struct udevice *dev)
{ {
void *bd_space; void *bd_space;
struct zynq_gem_priv *priv = dev_get_priv(dev); struct zynq_gem_priv *priv = dev_get_priv(dev);
int ret; int ret;
ret = zynq_gem_reset_init(dev);
if (ret)
return ret;
/* Align rxbuffers to ARCH_DMA_MINALIGN */ /* Align rxbuffers to ARCH_DMA_MINALIGN */
priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN); priv->rxbuffers = memalign(ARCH_DMA_MINALIGN, RX_BUF * PKTSIZE_ALIGN);
if (!priv->rxbuffers) if (!priv->rxbuffers)