1. 22 9月, 2012 2 次提交
  2. 07 6月, 2012 2 次提交
    • A
      can: c_can: Add support for Bosch D_CAN controller · 69927fcc
      AnilKumar Ch 提交于
      This patch adds the support for D_CAN controller driver to the existing
      C_CAN driver.
      
      Bosch D_CAN controller is a full-CAN implementation which is compliant
      to CAN protocol version 2.0 part A and B. Bosch D_CAN user manual can be
      obtained from: http://www.semiconductors.bosch.de/media/en/pdf/
      ipmodules_1/can/d_can_users_manual_111.pdf
      
      A new array is added for accessing the d_can registers, according to d_can
      controller register space.
      
      Current D_CAN implementation has following limitations, this is done
      to avoid large changes to the C_CAN driver.
      1. Message objects are limited to 32, 16 for RX and 16 for TX. C_CAN IP
         supports upto 32 message objects but in case of D_CAN we can configure
         upto 128 message objects.
      2. Using two 16bit reads/writes for accessing the 32bit D_CAN registers.
      3. These patches have been tested on little endian machine, there might
         be some hidden endian-related issues due to the nature of the accesses
         (32-bit registers accessed as 2 16-bit registers). However, I do not
         have a big-endian D_CAN implementation to confirm.
      Signed-off-by: NAnilKumar Ch <anilkumar@ti.com>
      Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
      69927fcc
    • A
      can: c_can: Move overlay structure to array with offset as index · 33f81009
      AnilKumar Ch 提交于
      c_can uses overlay structure for accessing c_can module registers.
      With this kind of implementation it is difficult to add one more ip
      which is similar to c_can in functionality but different register
      offsets.
      
      This patch changes the overlay structure implementation to an array
      with register offset as index. This way we can overcome the above
      limitation.
      Signed-off-by: NAnilKumar Ch <anilkumar@ti.com>
      Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
      33f81009
  3. 04 6月, 2012 1 次提交
    • A
      can: c_can: fix an interrupt thrash issue with c_can driver · 148c87c8
      AnilKumar Ch 提交于
      This patch fixes an interrupt thrash issue with c_can driver.
      
      In c_can_isr() function interrupts are disabled and enabled only in
      c_can_poll() function. c_can_isr() & c_can_poll() both read the
      irqstatus flag. However, irqstatus is always read as 0 in c_can_poll()
      because all C_CAN interrupts are disabled in c_can_isr(). This causes
      all interrupts to be re-enabled in c_can_poll() which in turn causes
      another interrupt since the event is not really handled. This keeps
      happening causing a flood of interrupts.
      
      To fix this, read the irqstatus register in isr and use the same cached
      value in the poll function.
      
      Cc: stable@kernel.org # 2.6.39+
      Signed-off-by: NAnilKumar Ch <anilkumar@ti.com>
      Acked-by: NWolfgang Grandegger <wg@grandegger.com>
      Signed-off-by: NMarc Kleine-Budde <mkl@pengutronix.de>
      148c87c8
  4. 14 2月, 2011 1 次提交