linux-kernel - [PATCH 09/21] fsl/fman: backup and restore ICID registers

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Message-Id: <20180919123613.15092-10-laurentiu.tudor@nxp.com>
Date:   Wed, 19 Sep 2018 15:36:01 +0300
From:   laurentiu.tudor@....com
To:     devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     roy.pledge@....com, madalin.bucur@....com, davem@...emloft.net,
        shawnguo@...nel.org, leoyang.li@....com,
        Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH 09/21] fsl/fman: backup and restore ICID registers

From: Laurentiu Tudor <laurentiu.tudor@....com>

During probing, FMAN is reset thus losing all its register
settings. Backup port ICID registers before reset and restore
them after, similarly to how it's done on powerpc / PAMU based
platforms.
This also has the side effect of disabling the old code path
(liodn backup/restore handling) that obviously make no sense
in the context of SMMU on ARMs.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---
 drivers/net/ethernet/freescale/fman/fman.c | 35 +++++++++++++++++++++-
 drivers/net/ethernet/freescale/fman/fman.h |  4 +++
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/fman/fman.c b/drivers/net/ethernet/freescale/fman/fman.c
index c415ac67cb7b..8f9136892d98 100644
--- a/drivers/net/ethernet/freescale/fman/fman.c
+++ b/drivers/net/ethernet/freescale/fman/fman.c
@@ -629,6 +629,7 @@ static void set_port_order_restoration(struct fman_fpm_regs __iomem *fpm_rg,
 	iowrite32be(tmp, &fpm_rg->fmfp_prc);
 }
 
+#ifdef CONFIG_PPC
 static void set_port_liodn(struct fman *fman, u8 port_id,
 			   u32 liodn_base, u32 liodn_ofst)
 {
@@ -646,6 +647,27 @@ static void set_port_liodn(struct fman *fman, u8 port_id,
 	iowrite32be(tmp, &fman->dma_regs->fmdmplr[port_id / 2]);
 	iowrite32be(liodn_ofst, &fman->bmi_regs->fmbm_spliodn[port_id - 1]);
 }
+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+static void save_restore_port_icids(struct fman *fman, bool save)
+{
+	int port_idxes[] = {
+		0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc,
+		0xd, 0xe, 0xf, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
+		0x10, 0x11, 0x30, 0x31
+	};
+	int idx, i;
+
+	for (i = 0; i < ARRAY_SIZE(port_idxes); i++) {
+		idx = port_idxes[i];
+		if (save)
+			fman->sp_icids[idx] =
+				ioread32be(&fman->bmi_regs->fmbm_spliodn[idx]);
+		else
+			iowrite32be(fman->sp_icids[idx],
+				    &fman->bmi_regs->fmbm_spliodn[idx]);
+	}
+}
+#endif
 
 static void enable_rams_ecc(struct fman_fpm_regs __iomem *fpm_rg)
 {
@@ -1914,7 +1936,10 @@ static int fman_reset(struct fman *fman)
 static int fman_init(struct fman *fman)
 {
 	struct fman_cfg *cfg = NULL;
-	int err = 0, i, count;
+	int err = 0, count;
+#ifdef CONFIG_PPC
+	int i;
+#endif
 
 	if (is_init_done(fman->cfg))
 		return -EINVAL;
@@ -1934,6 +1959,7 @@ static int fman_init(struct fman *fman)
 	memset_io((void __iomem *)(fman->base_addr + CGP_OFFSET), 0,
 		  fman->state->fm_port_num_of_cg);
 
+#ifdef CONFIG_PPC
 	/* Save LIODN info before FMan reset
 	 * Skipping non-existent port 0 (i = 1)
 	 */
@@ -1953,6 +1979,9 @@ static int fman_init(struct fman *fman)
 		}
 		fman->liodn_base[i] = liodn_base;
 	}
+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+	save_restore_port_icids(fman, true);
+#endif
 
 	err = fman_reset(fman);
 	if (err)
@@ -2181,8 +2210,12 @@ int fman_set_port_params(struct fman *fman,
 	if (err)
 		goto return_err;
 
+#ifdef CONFIG_PPC
 	set_port_liodn(fman, port_id, fman->liodn_base[port_id],
 		       fman->liodn_offset[port_id]);
+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+	save_restore_port_icids(fman, false);
+#endif
 
 	if (fman->state->rev_info.major < 6)
 		set_port_order_restoration(fman->fpm_regs, port_id);
diff --git a/drivers/net/ethernet/freescale/fman/fman.h b/drivers/net/ethernet/freescale/fman/fman.h
index 935c317fa696..19f20fa58053 100644
--- a/drivers/net/ethernet/freescale/fman/fman.h
+++ b/drivers/net/ethernet/freescale/fman/fman.h
@@ -346,8 +346,12 @@ struct fman {
 	unsigned long fifo_offset;
 	size_t fifo_size;
 
+#ifdef CONFIG_PPC
 	u32 liodn_base[64];
 	u32 liodn_offset[64];
+#elif defined(CONFIG_ARM) || defined(CONFIG_ARM64)
+	u32 sp_icids[64];
+#endif
 
 	struct fman_dts_params dts_params;
 };
-- 
2.17.1