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openwrtv3/target/linux/gemini/patches-4.14/0011-pinctrl-gemini-Support-drive-strength-setting.patch
Roman Yeryomin 4f74957584 gemini: add 4.14 support 
This adds the patches to get fairly complete Gemini support
using kernel v4.14. It is mainly a backport of patches from
kernel v4.16 with omissions of things like graphics that require
substantial changes and will be better handled once we move
to the v4.16 kernel proper.
On top of this are some WIP patches for USB support.

Tested on Raidsonic NAS4220B and D-link DNS-313.

ChangeLog v4->v5:
- Fix ethernet single gmac usecase
- Fix USB reset (patch from Hans)
- Fix Raidsonic ethernet skew delay
- Fix kernel config (bridge, squashfs, jffs2, usb)
- Disable second usb port on Raidsonic board until fotg210_hcd is fixed

ChangeLog v3->v4:
- Make sure to use tabs rather than spaces in base-files.
- Use the dns313 image tool from the firmware-utils.
- Break out the addition of the v4.14 patches and the removal
  of the v4.4 patches to separate (big) patches.

ChangeLog v2->v3:
- Update the kernel config as indicated by Hauke Martens:
- Regenerate again after rebasing using kernel_oldconfig
  dropping a few optimization settings that are now generic
- Drop CFG80211 stuff (module)
- Drop CIFS stuff (module)
- Drop MAC80211 (module)
- Drop wireless drivers (module)
- Enabled OverlayFS
- Added proper DNS-313 boot image generation with the special
  file header tool.
- Disable CMA in the kernel
- Enable LZMA compression of the kernel
- Consequently name the nas4220b images nas4220b
- Update preinit MAC detection script to handle also DNS-313
- Add board.d/03_hdparm to set the disk to spin down after
  1 minute by default, if we have the hdparm tool installed

ChangeLog v1->v2:
- Processed config through kernel_oldconfig
- Processed patches through make target/linux/{clean,refresh} V=99

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Roman Yeryomin <roman@advem.lv>
2018-05-05 06:57:00 +02:00

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From f147cf49ef39f5e87d5df9ef1fab52683bc75c63 Mon Sep 17 00:00:00 2001
From: Linus Walleij <linus.walleij@linaro.org>
Date: Sat, 2 Dec 2017 12:23:09 +0100
Subject: [PATCH 11/31] pinctrl: gemini: Support drive strength setting
The Gemini pin controller can set drive strength for a few
select groups of pins (not individually). Implement this
for GMAC0 and 1 (ethernet ports), IDE and PCI.
Cc: devicetree@vger.kernel.org
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
.../bindings/pinctrl/cortina,gemini-pinctrl.txt | 3 +
drivers/pinctrl/pinctrl-gemini.c | 81 ++++++++++++++++++++++
2 files changed, 84 insertions(+)
--- a/Documentation/devicetree/bindings/pinctrl/cortina,gemini-pinctrl.txt
+++ b/Documentation/devicetree/bindings/pinctrl/cortina,gemini-pinctrl.txt
@@ -17,6 +17,9 @@ and generic pin config nodes.
Supported configurations:
- skew-delay is supported on the Ethernet pins
+- drive-strength with 4, 8, 12 or 16 mA as argument is supported for
+ entire groups on the groups "idegrp", "gmii_gmac0_grp", "gmii_gmac1_grp"
+ and "pcigrp".
Example:
--- a/drivers/pinctrl/pinctrl-gemini.c
+++ b/drivers/pinctrl/pinctrl-gemini.c
@@ -67,6 +67,9 @@ struct gemini_pmx {
* elements in .pins so we can iterate over that array
* @mask: bits to clear to enable this when doing pin muxing
* @value: bits to set to enable this when doing pin muxing
+ * @driving_mask: bitmask for the IO Pad driving register for this
+ * group, if it supports altering the driving strength of
+ * its lines.
*/
struct gemini_pin_group {
const char *name;
@@ -74,12 +77,14 @@ struct gemini_pin_group {
const unsigned int num_pins;
u32 mask;
u32 value;
+ u32 driving_mask;
};
/* Some straight-forward control registers */
#define GLOBAL_WORD_ID 0x00
#define GLOBAL_STATUS 0x04
#define GLOBAL_STATUS_FLPIN BIT(20)
+#define GLOBAL_IODRIVE 0x10
#define GLOBAL_GMAC_CTRL_SKEW 0x1c
#define GLOBAL_GMAC0_DATA_SKEW 0x20
#define GLOBAL_GMAC1_DATA_SKEW 0x24
@@ -738,6 +743,7 @@ static const struct gemini_pin_group gem
/* Conflict with all flash usage */
.value = IDE_PADS_ENABLE | NAND_PADS_DISABLE |
PFLASH_PADS_DISABLE | SFLASH_PADS_DISABLE,
+ .driving_mask = GENMASK(21, 20),
},
{
.name = "satagrp",
@@ -753,6 +759,7 @@ static const struct gemini_pin_group gem
.name = "gmii_gmac0_grp",
.pins = gmii_gmac0_3512_pins,
.num_pins = ARRAY_SIZE(gmii_gmac0_3512_pins),
+ .driving_mask = GENMASK(17, 16),
},
{
.name = "gmii_gmac1_grp",
@@ -760,6 +767,7 @@ static const struct gemini_pin_group gem
.num_pins = ARRAY_SIZE(gmii_gmac1_3512_pins),
/* Bring out RGMII on the GMAC1 pins */
.value = GEMINI_GMAC_IOSEL_GMAC0_GMAC1_RGMII,
+ .driving_mask = GENMASK(19, 18),
},
{
.name = "pcigrp",
@@ -767,6 +775,7 @@ static const struct gemini_pin_group gem
.num_pins = ARRAY_SIZE(pci_3512_pins),
/* Conflict only with GPIO2 */
.value = PCI_PADS_ENABLE | PCI_CLK_PAD_ENABLE,
+ .driving_mask = GENMASK(23, 22),
},
{
.name = "lpcgrp",
@@ -1671,6 +1680,7 @@ static const struct gemini_pin_group gem
/* Conflict with all flash usage */
.value = IDE_PADS_ENABLE | NAND_PADS_DISABLE |
PFLASH_PADS_DISABLE | SFLASH_PADS_DISABLE,
+ .driving_mask = GENMASK(21, 20),
},
{
.name = "satagrp",
@@ -1686,6 +1696,7 @@ static const struct gemini_pin_group gem
.name = "gmii_gmac0_grp",
.pins = gmii_gmac0_3516_pins,
.num_pins = ARRAY_SIZE(gmii_gmac0_3516_pins),
+ .driving_mask = GENMASK(17, 16),
},
{
.name = "gmii_gmac1_grp",
@@ -1693,6 +1704,7 @@ static const struct gemini_pin_group gem
.num_pins = ARRAY_SIZE(gmii_gmac1_3516_pins),
/* Bring out RGMII on the GMAC1 pins */
.value = GEMINI_GMAC_IOSEL_GMAC0_GMAC1_RGMII,
+ .driving_mask = GENMASK(19, 18),
},
{
.name = "pcigrp",
@@ -1700,6 +1712,7 @@ static const struct gemini_pin_group gem
.num_pins = ARRAY_SIZE(pci_3516_pins),
/* Conflict only with GPIO2 */
.value = PCI_PADS_ENABLE | PCI_CLK_PAD_ENABLE,
+ .driving_mask = GENMASK(23, 22),
},
{
.name = "lpcgrp",
@@ -2394,9 +2407,77 @@ static int gemini_pinconf_set(struct pin
return ret;
}
+static int gemini_pinconf_group_set(struct pinctrl_dev *pctldev,
+ unsigned selector,
+ unsigned long *configs,
+ unsigned num_configs)
+{
+ struct gemini_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+ const struct gemini_pin_group *grp = NULL;
+ enum pin_config_param param;
+ u32 arg;
+ u32 val;
+ int i;
+
+ if (pmx->is_3512)
+ grp = &gemini_3512_pin_groups[selector];
+ if (pmx->is_3516)
+ grp = &gemini_3516_pin_groups[selector];
+
+ /* First figure out if this group supports configs */
+ if (!grp->driving_mask) {
+ dev_err(pmx->dev, "pin config group \"%s\" does "
+ "not support drive strength setting\n",
+ grp->name);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < num_configs; i++) {
+ param = pinconf_to_config_param(configs[i]);
+ arg = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_DRIVE_STRENGTH:
+ switch (arg) {
+ case 4:
+ val = 0;
+ break;
+ case 8:
+ val = 1;
+ break;
+ case 12:
+ val = 2;
+ break;
+ case 16:
+ val = 3;
+ break;
+ default:
+ dev_err(pmx->dev,
+ "invalid drive strength %d mA\n",
+ arg);
+ return -ENOTSUPP;
+ }
+ val <<= (ffs(grp->driving_mask) - 1);
+ regmap_update_bits(pmx->map, GLOBAL_IODRIVE,
+ grp->driving_mask,
+ val);
+ dev_info(pmx->dev,
+ "set group %s to %d mA drive strength mask %08x val %08x\n",
+ grp->name, arg, grp->driving_mask, val);
+ break;
+ default:
+ dev_err(pmx->dev, "invalid config param %04x\n", param);
+ return -ENOTSUPP;
+ }
+ }
+
+ return 0;
+}
+
static const struct pinconf_ops gemini_pinconf_ops = {
.pin_config_get = gemini_pinconf_get,
.pin_config_set = gemini_pinconf_set,
+ .pin_config_group_set = gemini_pinconf_group_set,
.is_generic = true,
};
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