[PATCH v2 14/31] fsi: aspeed: Use common initialization and link enable

Eddie James
2024-02-26T16:53:50Z

Create a regmap for accessing the master registers over OPB
to use the new common master initialization and link enable procedures.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
---
drivers/fsi/fsi-master-aspeed.c | 146 ++++++++------------------------
1 file changed, 37 insertions(+), 109 deletions(-)

diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c
index d6e923b8f501..2258980e4c47 100644
--- a/drivers/fsi/fsi-master-aspeed.c
+++ b/drivers/fsi/fsi-master-aspeed.c
@@ -90,14 +90,6 @@ static const u32 fsi_base = 0xa0000000;
#define CREATE_TRACE_POINTS
#include <trace/events/fsi_master_aspeed.h>

-#define FSI_LINK_ENABLE_SETUP_TIME 10 /* in mS */
-
-/* Run the bus at maximum speed by default */
-#define FSI_DIVISOR_DEFAULT 1
-#define FSI_DIVISOR_CABLED 2
-static u16 aspeed_fsi_divisor = FSI_DIVISOR_DEFAULT;
-module_param_named(bus_div,aspeed_fsi_divisor, ushort, 0);
-
#define OPB_POLL_TIMEOUT 500

static int __opb_write(struct fsi_master_aspeed *aspeed, u32 addr,
@@ -328,35 +320,6 @@ static int aspeed_master_write(struct fsi_master *master, int link,
return ret;
}

-static int aspeed_master_link_enable(struct fsi_master *master, int link,
- bool enable)
-{
- struct fsi_master_aspeed *aspeed = to_fsi_master_aspeed(master);
- int idx, bit, ret;
- __be32 reg;
-
- idx = link / 32;
- bit = link % 32;
-
- reg = cpu_to_be32(0x80000000 >> bit);
-
- mutex_lock(&aspeed->lock);
-
- if (!enable) {
- ret = opb_writel(aspeed, ctrl_base + FSI_MCENP0 + (4 * idx), reg);
- goto done;
- }
-
- ret = opb_writel(aspeed, ctrl_base + FSI_MSENP0 + (4 * idx), reg);
- if (ret)
- goto done;
-
- mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-done:
- mutex_unlock(&aspeed->lock);
- return ret;
-}
-
static int aspeed_master_term(struct fsi_master *master, int link, uint8_t id)
{
uint32_t addr;
@@ -384,72 +347,33 @@ static void aspeed_master_release(struct device *dev)
struct fsi_master_aspeed *aspeed =
to_fsi_master_aspeed(to_fsi_master(dev));

+ regmap_exit(aspeed->master.map);
kfree(aspeed);
}

-/* mmode encoders */
-static inline u32 fsi_mmode_crs0(u32 x)
+static int regmap_aspeed_opb_read(void *context, unsigned int reg, unsigned int *val)
{
- return (x & FSI_MMODE_CRS0MASK) << FSI_MMODE_CRS0SHFT;
-}
+ __be32 v;
+ int ret;

-static inline u32 fsi_mmode_crs1(u32 x)
-{
- return (x & FSI_MMODE_CRS1MASK) << FSI_MMODE_CRS1SHFT;
+ ret = opb_readl(context, ctrl_base + reg, &v);
+ if (ret)
+ return ret;
+
+ *val = be32_to_cpu(v);
+ return 0;
}

-static int aspeed_master_init(struct fsi_master_aspeed *aspeed)
+static int regmap_aspeed_opb_write(void *context, unsigned int reg, unsigned int val)
{
- __be32 reg;
-
- reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
- | FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
- opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
-
- /* Initialize the MFSI (hub master) engine */
- reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK
- | FSI_MRESP_RST_MCR | FSI_MRESP_RST_PYE);
- opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
-
- reg = cpu_to_be32(FSI_MECTRL_EOAE | FSI_MECTRL_P8_AUTO_TERM);
- opb_writel(aspeed, ctrl_base + FSI_MECTRL, reg);
-
- reg = cpu_to_be32(FSI_MMODE_ECRC | FSI_MMODE_EPC | FSI_MMODE_RELA
- | fsi_mmode_crs0(aspeed_fsi_divisor)
- | fsi_mmode_crs1(aspeed_fsi_divisor)
- | FSI_MMODE_P8_TO_LSB);
- dev_info(aspeed->dev, "mmode set to %08x (divisor %d)\n",
- be32_to_cpu(reg), aspeed_fsi_divisor);
- opb_writel(aspeed, ctrl_base + FSI_MMODE, reg);
-
- reg = cpu_to_be32(0xffff0000);
- opb_writel(aspeed, ctrl_base + FSI_MDLYR, reg);
-
- reg = cpu_to_be32(~0);
- opb_writel(aspeed, ctrl_base + FSI_MSENP0, reg);
-
- /* Leave enabled long enough for master logic to set up */
- mdelay(FSI_LINK_ENABLE_SETUP_TIME);
-
- opb_writel(aspeed, ctrl_base + FSI_MCENP0, reg);
-
- opb_readl(aspeed, ctrl_base + FSI_MAEB, NULL);
-
- reg = cpu_to_be32(FSI_MRESP_RST_ALL_MASTER | FSI_MRESP_RST_ALL_LINK);
- opb_writel(aspeed, ctrl_base + FSI_MRESP0, reg);
-
- opb_readl(aspeed, ctrl_base + FSI_MLEVP0, NULL);
-
- /* Reset the master bridge */
- reg = cpu_to_be32(FSI_MRESB_RST_GEN);
- opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
-
- reg = cpu_to_be32(FSI_MRESB_RST_ERR);
- opb_writel(aspeed, ctrl_base + FSI_MRESB0, reg);
-
- return 0;
+ return opb_writel(context, ctrl_base + reg, cpu_to_be32(val));
}

+static const struct regmap_bus regmap_aspeed_opb = {
+ .reg_write = regmap_aspeed_opb_write,
+ .reg_read = regmap_aspeed_opb_read,
+};
+
static ssize_t cfam_reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
@@ -521,14 +445,6 @@ static int tacoma_cabled_fsi_fixup(struct device *dev)

/* If the routing GPIO is high we should set the mux to low. */
if (gpio) {
- /*
- * Cable signal integrity means we should run the bus
- * slightly slower. Do not override if a kernel param
- * has already overridden.
- */
- if (aspeed_fsi_divisor == FSI_DIVISOR_DEFAULT)
- aspeed_fsi_divisor = FSI_DIVISOR_CABLED;
-
gpiod_direction_output(mux_gpio, 0);
dev_info(dev, "FSI configured for external cable\n");
} else {
@@ -544,9 +460,10 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
{
const struct fsi_master_aspeed_data *md = of_device_get_match_data(&pdev->dev);
u32 opb_retry_counter = md ? md->opb_retry_counter : OPB_RETRY_COUNTER_AST2600;
+ struct regmap_config aspeed_master_regmap_config;
struct fsi_master_aspeed *aspeed;
- int rc, links, reg;
- __be32 raw;
+ unsigned int reg;
+ int rc, links;

rc = tacoma_cabled_fsi_fixup(&pdev->dev);
if (rc) {
@@ -606,13 +523,20 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
*/
writel(0x1, aspeed->base + OPB0_SELECT);

- rc = opb_readl(aspeed, ctrl_base + FSI_MVER, &raw);
+ fsi_master_regmap_config(&aspeed_master_regmap_config);
+ aspeed->master.map = regmap_init(&pdev->dev, &regmap_aspeed_opb, aspeed,
+ &aspeed_master_regmap_config);
+ if (IS_ERR(aspeed->master.map)) {
+ rc = PTR_ERR(aspeed->master.map);
+ goto err_release;
+ }
+
+ rc = regmap_read(aspeed->master.map, FSI_MVER, &reg);
if (rc) {
dev_err(&pdev->dev, "failed to read hub version\n");
- goto err_release;
+ goto err_regmap;
}

- reg = be32_to_cpu(raw);
links = (reg >> 8) & 0xff;
dev_info(&pdev->dev, "hub version %08x (%d links)\n", reg, links);

@@ -621,20 +545,22 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
aspeed->master.dev.of_node = of_node_get(dev_of_node(&pdev->dev));

aspeed->master.n_links = links;
+ aspeed->master.flags = FSI_MASTER_FLAG_RELA;
aspeed->master.read = aspeed_master_read;
aspeed->master.write = aspeed_master_write;
aspeed->master.send_break = aspeed_master_break;
aspeed->master.term = aspeed_master_term;
- aspeed->master.link_enable = aspeed_master_link_enable;

dev_set_drvdata(&pdev->dev, aspeed);

mutex_init(&aspeed->lock);
- aspeed_master_init(aspeed);
+ rc = fsi_master_init(&aspeed->master, clk_get_rate(aspeed->clk));
+ if (rc)
+ goto err_regmap;

rc = fsi_master_register(&aspeed->master);
if (rc)
- goto err_release;
+ goto err_regmap;

/* At this point, fsi_master_register performs the device_initialize(),
* and holds the sole reference on master.dev. This means the device
@@ -646,6 +572,8 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
get_device(&aspeed->master.dev);
return 0;

+err_regmap:
+ regmap_exit(aspeed->master.map);
err_release:
clk_disable_unprepare(aspeed->clk);
err_free_aspeed:
--
2.39.3