soc: keystone_serdes: generalize configuration mechanism

The cmu, comlane, lane configuration mechanism are similar for sub
systems as well such as PCI or sRIO, but they have different values
based on input clock and output bus rate. According to this compact
driver to simplify adding different configuration settings based
on clock and rate.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>

drivers/soc/keystone/keystone_serdes.c

@@ -29,12 +29,24 @@
 #define SERDES_LANE_LOOPBACK		BIT(30)
 #define SERDES_LANE_EN_VAL(x, y, z)	(x[y] | (z << 26) | (z << 10))
 
+#define SERDES_CMU_CFG_NUM		5
+#define SERDES_COMLANE_CFG_NUM		10
+#define SERDES_LANE_CFG_NUM		10
+
 struct serdes_cfg {
 	u32 ofs;
 	u32 val;
 	u32 mask;
 };
 
+struct cfg_entry {
+	enum ks2_serdes_clock clk;
+	enum ks2_serdes_rate rate;
+	struct serdes_cfg cmu[SERDES_CMU_CFG_NUM];
+	struct serdes_cfg comlane[SERDES_COMLANE_CFG_NUM];
+	struct serdes_cfg lane[SERDES_LANE_CFG_NUM];
+};
+
 /* SERDES PHY lane enable configuration value, indexed by PHY interface */
 static u32 serdes_cfg_lane_enable[] = {
 	0xf000f0c0,     /* SGMII */
@@ -47,39 +59,46 @@ static u32 serdes_cfg_pll_enable[] = {
 	0xee000000,     /* PCSR */
 };
 
-static struct serdes_cfg cfg_cmu_156p25m_5g[] = {
-	{0x0000, 0x00800000, 0xffff0000},
-	{0x0014, 0x00008282, 0x0000ffff},
-	{0x0060, 0x00142438, 0x00ffffff},
-	{0x0064, 0x00c3c700, 0x00ffff00},
-	{0x0078, 0x0000c000, 0x0000ff00}
-};
-
-static struct serdes_cfg cfg_comlane_156p25m_5g[] = {
-	{0x0a00, 0x00000800, 0x0000ff00},
-	{0x0a08, 0x38a20000, 0xffff0000},
-	{0x0a30, 0x008a8a00, 0x00ffff00},
-	{0x0a84, 0x00000600, 0x0000ff00},
-	{0x0a94, 0x10000000, 0xff000000},
-	{0x0aa0, 0x81000000, 0xff000000},
-	{0x0abc, 0xff000000, 0xff000000},
-	{0x0ac0, 0x0000008b, 0x000000ff},
-	{0x0b08, 0x583f0000, 0xffff0000},
-	{0x0b0c, 0x0000004e, 0x000000ff}
-};
-
-static struct serdes_cfg cfg_lane_156p25mhz_5g[] = {
-	{0x0004, 0x38000080, 0xff0000ff},
-	{0x0008, 0x00000000, 0x000000ff},
-	{0x000c, 0x02000000, 0xff000000},
-	{0x0010, 0x1b000000, 0xff000000},
-	{0x0014, 0x00006fb8, 0x0000ffff},
-	{0x0018, 0x758000e4, 0xffff00ff},
-	{0x00ac, 0x00004400, 0x0000ff00},
-	{0x002c, 0x00100800, 0x00ffff00},
-	{0x0080, 0x00820082, 0x00ff00ff},
-	{0x0084, 0x1d0f0385, 0xffffffff}
-
+/**
+ * Array to hold all possible serdes configurations.
+ * Combination for 5 clock settings and 6 baud rates.
+ */
+static struct cfg_entry cfgs[] = {
+	{
+		.clk = SERDES_CLOCK_156P25M,
+		.rate = SERDES_RATE_5G,
+		.cmu = {
+			{0x0000, 0x00800000, 0xffff0000},
+			{0x0014, 0x00008282, 0x0000ffff},
+			{0x0060, 0x00142438, 0x00ffffff},
+			{0x0064, 0x00c3c700, 0x00ffff00},
+			{0x0078, 0x0000c000, 0x0000ff00}
+		},
+		.comlane = {
+			{0x0a00, 0x00000800, 0x0000ff00},
+			{0x0a08, 0x38a20000, 0xffff0000},
+			{0x0a30, 0x008a8a00, 0x00ffff00},
+			{0x0a84, 0x00000600, 0x0000ff00},
+			{0x0a94, 0x10000000, 0xff000000},
+			{0x0aa0, 0x81000000, 0xff000000},
+			{0x0abc, 0xff000000, 0xff000000},
+			{0x0ac0, 0x0000008b, 0x000000ff},
+			{0x0b08, 0x583f0000, 0xffff0000},
+			{0x0b0c, 0x0000004e, 0x000000ff}
+		},
+		.lane = {
+			{0x0004, 0x38000080, 0xff0000ff},
+			{0x0008, 0x00000000, 0x000000ff},
+			{0x000c, 0x02000000, 0xff000000},
+			{0x0010, 0x1b000000, 0xff000000},
+			{0x0014, 0x00006fb8, 0x0000ffff},
+			{0x0018, 0x758000e4, 0xffff00ff},
+			{0x00ac, 0x00004400, 0x0000ff00},
+			{0x002c, 0x00100800, 0x00ffff00},
+			{0x0080, 0x00820082, 0x00ff00ff},
+			{0x0084, 0x1d0f0385, 0xffffffff}
+		},
+	},
 };
 
 static inline void ks2_serdes_rmw(u32 addr, u32 value, u32 mask)
@@ -105,18 +124,15 @@ static void ks2_serdes_lane_config(u32 base, struct serdes_cfg *cfg_lane,
 			       cfg_lane[i].val, cfg_lane[i].mask);
 }
 
-static int ks2_serdes_init_156p25m_5g(u32 base, u32 num_lanes)
+static int ks2_serdes_init_cfg(u32 base, struct cfg_entry *cfg, u32 num_lanes)
 {
 	u32 i;
 
-	ks2_serdes_cfg_setup(base, cfg_cmu_156p25m_5g,
-			     ARRAY_SIZE(cfg_cmu_156p25m_5g));
-	ks2_serdes_cfg_setup(base, cfg_comlane_156p25m_5g,
-			     ARRAY_SIZE(cfg_comlane_156p25m_5g));
+	ks2_serdes_cfg_setup(base, cfg->cmu, SERDES_CMU_CFG_NUM);
+	ks2_serdes_cfg_setup(base, cfg->comlane, SERDES_COMLANE_CFG_NUM);
 
 	for (i = 0; i < num_lanes; i++)
-		ks2_serdes_lane_config(base, cfg_lane_156p25mhz_5g,
-				       ARRAY_SIZE(cfg_lane_156p25mhz_5g), i);
+		ks2_serdes_lane_config(base, cfg->lane, SERDES_LANE_CFG_NUM, i);
 
 	return 0;
 }
@@ -173,14 +189,16 @@ int ks2_serdes_init(u32 base, struct ks2_serdes *serdes, u32 num_lanes)
 	int i;
 	int ret = 0;
 
-	/* The driver currently supports 5GBaud rate with ref clock 156.25MHz */
-	if (serdes->clk == SERDES_CLOCK_156P25M)
-		if (serdes->rate == SERDES_RATE_5G)
-			ret = ks2_serdes_init_156p25m_5g(base, num_lanes);
-		else
-			return -EINVAL;
-	else
+	for (i = 0; i < ARRAY_SIZE(cfgs); i++)
+		if (serdes->clk == cfgs[i].clk && serdes->rate == cfgs[i].rate)
+			break;
+
+	if (i >= ARRAY_SIZE(cfgs)) {
+		puts("Cannot find keystone SerDes configuration");
 		return -EINVAL;
+	}
+
+	ks2_serdes_init_cfg(base, &cfgs[i], num_lanes);
 
 	ks2_serdes_cmu_comlane_enable(base, serdes);
 	for (i = 0; i < num_lanes; i++)