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[PATCH 06/11] bcma: add serial console support

To: linville@tuxdriver.com, linux-wireless@vger.kernel.org, linux-mips@linux-mips.org
Subject: [PATCH 06/11] bcma: add serial console support
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sat, 23 Jul 2011 01:20:10 +0200
Cc: jonas.gorski@gmail.com, ralf@linux-mips.org, zajec5@gmail.com, mb@bu3sch.de, george@znau.edu.ua, arend@broadcom.com, b43-dev@lists.infradead.org, bernhardloos@googlemail.com, arnd@arndb.de, julian.calaby@gmail.com, sshtylyov@mvista.com, Hauke Mehrtens <hauke@hauke-m.de>
In-reply-to: <1311376815-15755-1-git-send-email-hauke@hauke-m.de>
References: <1311376815-15755-1-git-send-email-hauke@hauke-m.de>
Sender: linux-mips-bounce@linux-mips.org
This adds support for serial console to bcma, when operating on an SoC.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
 drivers/bcma/bcma_private.h                 |    8 ++++
 drivers/bcma/driver_chipcommon.c            |   48 +++++++++++++++++++++++++++
 drivers/bcma/driver_chipcommon_pmu.c        |   26 ++++++++++++++
 drivers/bcma/driver_mips.c                  |    1 +
 include/linux/bcma/bcma_driver_chipcommon.h |   14 ++++++++
 5 files changed, 97 insertions(+), 0 deletions(-)

diff --git a/drivers/bcma/bcma_private.h b/drivers/bcma/bcma_private.h
index b97633d..22d3052 100644
--- a/drivers/bcma/bcma_private.h
+++ b/drivers/bcma/bcma_private.h
@@ -29,6 +29,14 @@ void bcma_init_bus(struct bcma_bus *bus);
 /* sprom.c */
 int bcma_sprom_get(struct bcma_bus *bus);
 
+/* driver_chipcommon.c */
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+void bcma_chipco_serial_init(struct bcma_drv_cc *cc);
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
+
+/* driver_chipcommon_pmu.c */
+u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc);
+
 #ifdef CONFIG_BCMA_HOST_PCI
 /* host_pci.c */
 extern int __init bcma_host_pci_init(void);
diff --git a/drivers/bcma/driver_chipcommon.c b/drivers/bcma/driver_chipcommon.c
index 75f1ad7..12b42ea 100644
--- a/drivers/bcma/driver_chipcommon.c
+++ b/drivers/bcma/driver_chipcommon.c
@@ -106,3 +106,51 @@ u32 bcma_chipco_gpio_polarity(struct bcma_drv_cc *cc, u32 
mask, u32 value)
 {
        return bcma_cc_write32_masked(cc, BCMA_CC_GPIOPOL, mask, value);
 }
+
+#ifdef CONFIG_BCMA_DRIVER_MIPS
+void bcma_chipco_serial_init(struct bcma_drv_cc *cc)
+{
+       unsigned int irq;
+       u32 baud_base;
+       u32 i;
+       unsigned int ccrev = cc->core->id.rev;
+       struct bcma_serial_port *ports = cc->serial_ports;
+
+       if (ccrev >= 11 && ccrev != 15) {
+               /* Fixed ALP clock */
+               baud_base = bcma_pmu_alp_clock(cc);
+               if (ccrev >= 21) {
+                       /* Turn off UART clock before switching clocksource. */
+                       bcma_cc_write32(cc, BCMA_CC_CORECTL,
+                                      bcma_cc_read32(cc, BCMA_CC_CORECTL)
+                                      & ~BCMA_CC_CORECTL_UARTCLKEN);
+               }
+               /* Set the override bit so we don't divide it */
+               bcma_cc_write32(cc, BCMA_CC_CORECTL,
+                              bcma_cc_read32(cc, BCMA_CC_CORECTL)
+                              | BCMA_CC_CORECTL_UARTCLK0);
+               if (ccrev >= 21) {
+                       /* Re-enable the UART clock. */
+                       bcma_cc_write32(cc, BCMA_CC_CORECTL,
+                                      bcma_cc_read32(cc, BCMA_CC_CORECTL)
+                                      | BCMA_CC_CORECTL_UARTCLKEN);
+               }
+       } else {
+               pr_err("serial not supported on this device ccrev: 0x%x\n",
+                      ccrev);
+               return;
+       }
+
+       irq = bcma_core_mips_irq(cc->core);
+
+       /* Determine the registers of the UARTs */
+       cc->nr_serial_ports = (cc->capabilities & BCMA_CC_CAP_NRUART);
+       for (i = 0; i < cc->nr_serial_ports; i++) {
+               ports[i].regs = cc->core->io_addr + BCMA_CC_UART0_DATA +
+                               (i * 256);
+               ports[i].irq = irq;
+               ports[i].baud_base = baud_base;
+               ports[i].reg_shift = 0;
+       }
+}
+#endif /* CONFIG_BCMA_DRIVER_MIPS */
diff --git a/drivers/bcma/driver_chipcommon_pmu.c 
b/drivers/bcma/driver_chipcommon_pmu.c
index dd5846b..59d2b26 100644
--- a/drivers/bcma/driver_chipcommon_pmu.c
+++ b/drivers/bcma/driver_chipcommon_pmu.c
@@ -136,3 +136,29 @@ void bcma_pmu_init(struct bcma_drv_cc *cc)
        bcma_pmu_swreg_init(cc);
        bcma_pmu_workarounds(cc);
 }
+
+u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc)
+{
+       struct bcma_bus *bus = cc->core->bus;
+
+       switch (bus->chipinfo.id) {
+       case 0x4716:
+       case 0x4748:
+       case 47162:
+       case 0x4313:
+       case 0x5357:
+       case 0x4749:
+       case 53572:
+               /* always 20Mhz */
+               return 20000 * 1000;
+       case 0x5356:
+       case 0x5300:
+               /* always 25Mhz */
+               return 25000 * 1000;
+       default:
+               pr_warn("No ALP clock specified for %04X device, "
+                       "pmu rev. %d, using default %d Hz\n",
+                       bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_ALP_CLOCK);
+       }
+       return BCMA_CC_PMU_ALP_CLOCK;
+}
diff --git a/drivers/bcma/driver_mips.c b/drivers/bcma/driver_mips.c
index 4b60c9f9..b17233c 100644
--- a/drivers/bcma/driver_mips.c
+++ b/drivers/bcma/driver_mips.c
@@ -238,6 +238,7 @@ void bcma_core_mips_init(struct bcma_drv_mips *mcore)
        if (mcore->setup_done)
                return;
 
+       bcma_chipco_serial_init(&bus->drv_cc);
        bcma_core_mips_flash_detect(mcore);
        mcore->setup_done = true;
 }
diff --git a/include/linux/bcma/bcma_driver_chipcommon.h 
b/include/linux/bcma/bcma_driver_chipcommon.h
index 03cde8d..b9a930e 100644
--- a/include/linux/bcma/bcma_driver_chipcommon.h
+++ b/include/linux/bcma/bcma_driver_chipcommon.h
@@ -241,6 +241,9 @@
 #define BCMA_CC_SPROM                  0x0800 /* SPROM beginning */
 #define BCMA_CC_SPROM_PCIE6            0x0830 /* SPROM beginning on PCIe rev 
>= 6 */
 
+/* ALP clock on pre-PMU chips */
+#define BCMA_CC_PMU_ALP_CLOCK          20000000
+
 /* Data for the PMU, if available.
  * Check availability with ((struct bcma_chipcommon)->capabilities & 
BCMA_CC_CAP_PMU)
  */
@@ -255,6 +258,14 @@ struct bcma_pflash {
        u32 window;
        u32 window_size;
 };
+
+struct bcma_serial_port {
+       void *regs;
+       unsigned long clockspeed;
+       unsigned int irq;
+       unsigned int baud_base;
+       unsigned int reg_shift;
+};
 #endif /* CONFIG_BCMA_DRIVER_MIPS */
 
 struct bcma_drv_cc {
@@ -268,6 +279,9 @@ struct bcma_drv_cc {
        struct bcma_chipcommon_pmu pmu;
 #ifdef CONFIG_BCMA_DRIVER_MIPS
        struct bcma_pflash pflash;
+
+       int nr_serial_ports;
+       struct bcma_serial_port serial_ports[4];
 #endif /* CONFIG_BCMA_DRIVER_MIPS */
 };
 
-- 
1.7.4.1


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