rbcfg: Implement CPU frequency control
authorThibaut VARENE <hacks@slashdirt.org>
Sat, 25 Feb 2017 16:34:50 +0000 (17:34 +0100)
committerJo-Philipp Wich <jo@mein.io>
Sat, 7 Oct 2017 13:00:26 +0000 (15:00 +0200)
This patch implements CPU frequency control as found on several
routerboard devices.

Supported SoCs:
- QCA953X
- AR9344

Tested on hAP lite and mAP lite (QCA953x): steps of 50MHz
Tested on LHG 5 (AR9344): steps of 50MHz

On unsupported hardware, this patch is a NOP: it will not alter the
new field.
"rbcfg help" will display an empty "cpu_freq" help listing.
"rbcfg show" will not show the cpu_freq field.
"rbcfg set/get cpu_freq" will return an error code.

Signed-off-by: Thibaut VARENE <hacks@slashdirt.org>
[adjusted subject]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
package/boot/rbcfg/Makefile
package/boot/rbcfg/src/main.c
package/boot/rbcfg/src/rbcfg.h

index 412f7ab..9d9b975 100644 (file)
@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rbcfg
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
 
index 9aedcc5..2acbfbd 100644 (file)
@@ -2,6 +2,7 @@
  *  RouterBOOT configuration utility
  *
  *  Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2017 Thibaut VARENE <varenet@parisc-linux.org>
  *
  *  This program is free software; you can redistribute it and/or modify it
  *  under the terms of the GNU General Public License version 2 as published
@@ -29,6 +30,7 @@
 #define RB_ERR_INVALID         2
 #define RB_ERR_NOMEM           3
 #define RB_ERR_IO              4
+#define RB_ERR_NOTWANTED       5
 
 #define ARRAY_SIZE(_a) (sizeof((_a)) / sizeof((_a)[0]))
 
@@ -67,6 +69,11 @@ struct rbcfg_command {
        int             (*exec)(int argc, const char *argv[]);
 };
 
+struct rbcfg_soc {
+       const char      *needle;
+       const int       type;
+};
+
 static void usage(void);
 
 /* Globals */
@@ -135,12 +142,32 @@ static const struct rbcfg_value rbcfg_cpu_mode[] = {
                RB_CPU_MODE_REGULAR),
 };
 
+static const struct rbcfg_value rbcfg_cpu_freq_dummy[] = {
+};
+
+static const struct rbcfg_value rbcfg_cpu_freq_qca953x[] = {
+       CFG_U32("-2", "-100MHz", RB_CPU_FREQ_L2),
+       CFG_U32("-1", "- 50MHz", RB_CPU_FREQ_L1),
+       CFG_U32("0", "Factory", RB_CPU_FREQ_N0),
+       CFG_U32("+1", "+ 50MHz", RB_CPU_FREQ_H1),
+       CFG_U32("+2", "+100MHz", RB_CPU_FREQ_H2),
+};
+
+static const struct rbcfg_value rbcfg_cpu_freq_ar9344[] = {
+       CFG_U32("-2", "-100MHz", RB_CPU_FREQ_L2),
+       CFG_U32("-1", "- 50MHz", RB_CPU_FREQ_L1),
+       CFG_U32("0", "Factory", RB_CPU_FREQ_N0),
+       CFG_U32("+1", "+ 50MHz", RB_CPU_FREQ_H1),
+       CFG_U32("+2", "+100MHz", RB_CPU_FREQ_H2),
+       CFG_U32("+3", "+150MHz", RB_CPU_FREQ_H3),
+};
+
 static const struct rbcfg_value rbcfg_booter[] = {
        CFG_U32("regular", "load regular booter", RB_BOOTER_REGULAR),
        CFG_U32("backup", "force backup-booter loading", RB_BOOTER_BACKUP),
 };
 
-static const struct rbcfg_env rbcfg_envs[] = {
+static struct rbcfg_env rbcfg_envs[] = {
        {
                .name           = "boot_delay",
                .id             = RB_ID_BOOT_DELAY,
@@ -177,6 +204,12 @@ static const struct rbcfg_env rbcfg_envs[] = {
                .type           = RBCFG_ENV_TYPE_U32,
                .values         = rbcfg_cpu_mode,
                .num_values     = ARRAY_SIZE(rbcfg_cpu_mode),
+       }, {
+               .name           = "cpu_freq",
+               .id             = RB_ID_CPU_FREQ,
+               .type           = RBCFG_ENV_TYPE_U32,
+               .values         = rbcfg_cpu_freq_dummy,
+               .num_values     = ARRAY_SIZE(rbcfg_cpu_freq_dummy),
        }, {
                .name           = "uart_speed",
                .id             = RB_ID_UART_SPEED,
@@ -240,8 +273,10 @@ rbcfg_find_tag(struct rbcfg_ctx *ctx, uint16_t tag_id, uint16_t *tag_len,
                buf += 2;
                buflen -= 2;
 
-               if (id == RB_ID_TERMINATOR)
+               if (id == RB_ID_TERMINATOR) {
+                       ret = RB_ERR_NOTWANTED;
                        break;
+               }
 
                if (buflen < len)
                        break;
@@ -257,7 +292,7 @@ rbcfg_find_tag(struct rbcfg_ctx *ctx, uint16_t tag_id, uint16_t *tag_len,
                buflen -= len;
        }
 
-       if (ret)
+       if (RB_ERR_NOTFOUND == ret)
                fprintf(stderr, "no tag found with id=%u\n", tag_id);
 
        return ret;
@@ -748,6 +783,96 @@ usage(void)
        fprintf(stderr, "\n");
 }
 
+#define RBCFG_SOC_UNKNOWN      0
+#define RBCFG_SOC_QCA953X      1
+#define RBCFG_SOC_AR9344       2
+
+static const struct rbcfg_soc rbcfg_socs[] = {
+       {
+               .needle = "QCA953",
+               .type = RBCFG_SOC_QCA953X,
+       }, {
+               .needle = "AR9344",
+               .type = RBCFG_SOC_AR9344,
+       },
+};
+
+#define CPUINFO_BUFSIZE                128     /* lines of interest are < 80 chars */
+
+static int cpuinfo_find_soc(void)
+{
+       FILE *fp;
+       char temp[CPUINFO_BUFSIZE];
+       char *haystack, *needle;
+       int i, found = 0, soc_type = RBCFG_SOC_UNKNOWN;
+
+       fp = fopen("/proc/cpuinfo", "r");
+       if (!fp)
+               goto end;
+
+       /* first, extract the system type line */
+       needle = "system type";
+       while(fgets(temp, CPUINFO_BUFSIZE, fp)) {
+               if (!strncmp(temp, needle, strlen(needle))) {
+                       found = 1;
+                       break;
+               }
+       }
+
+       fclose(fp);
+
+       /* failsafe in case cpuinfo format changes */
+       if (!found)
+               goto end;
+
+       /* skip the field header */
+       haystack = strchr(temp, ':');
+
+       /* then, try to identify known SoC, stop at first match */
+       for (i = 0; i < ARRAY_SIZE(rbcfg_socs); i++) {
+               if ((strstr(haystack, rbcfg_socs[i].needle))) {
+                       soc_type = rbcfg_socs[i].type;
+                       break;
+               }
+       }
+
+end:
+       return soc_type;
+}
+
+static void fixup_rbcfg_envs(void)
+{
+       int i, num_val, soc_type;
+       const struct rbcfg_value * env_value;
+
+       /* detect SoC */
+       soc_type = cpuinfo_find_soc();
+
+       /* update rbcfg_envs */
+       switch (soc_type) {
+               case RBCFG_SOC_QCA953X:
+                       env_value = rbcfg_cpu_freq_qca953x;
+                       num_val = ARRAY_SIZE(rbcfg_cpu_freq_qca953x);
+                       break;
+               case RBCFG_SOC_AR9344:
+                       env_value = rbcfg_cpu_freq_ar9344;
+                       num_val = ARRAY_SIZE(rbcfg_cpu_freq_ar9344);
+                       break;
+       }
+
+       for (i = 0; i < ARRAY_SIZE(rbcfg_envs); i++) {
+               if (RB_ID_CPU_FREQ == rbcfg_envs[i].id) {
+                       if (RBCFG_SOC_UNKNOWN == soc_type)
+                               rbcfg_envs[i].id = RB_ID_TERMINATOR;
+                       else {
+                               rbcfg_envs[i].values = env_value;
+                               rbcfg_envs[i].num_values = num_val;
+                       }
+                       break;
+               }
+       }
+}
+
 int main(int argc, const char *argv[])
 {
        const struct rbcfg_command *cmd = NULL;
@@ -756,6 +881,8 @@ int main(int argc, const char *argv[])
 
        rbcfg_name = (char *) argv[0];
 
+       fixup_rbcfg_envs();
+
        if (argc < 2) {
                usage();
                return EXIT_FAILURE;
index 864bc82..88acc13 100644 (file)
@@ -32,6 +32,7 @@
 #define RB_ID_BOOT_PROTOCOL    9
 #define RB_ID_SOFT_10          10
 #define RB_ID_SOFT_11          11
+#define RB_ID_CPU_FREQ         12
 #define RB_ID_BOOTER           13
 
 #define RB_UART_SPEED_115200   0
 #define RB_BOOT_PROTOCOL_BOOTP 0
 #define RB_BOOT_PROTOCOL_DHCP  1
 
+#define RB_CPU_FREQ_L2         (0 << 3)
+#define RB_CPU_FREQ_L1         (1 << 3)
+#define RB_CPU_FREQ_N0         (2 << 3)
+#define RB_CPU_FREQ_H1         (3 << 3)
+#define RB_CPU_FREQ_H2         (4 << 3)
+#define RB_CPU_FREQ_H3         (5 << 3)
+
 #define RB_BOOTER_REGULAR      0
 #define RB_BOOTER_BACKUP       1